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Papermaking
Papermaking
Papermaking
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A sheet of fibres which were just collected from the liquid suspension with the screen. The next steps are to press it and to dry it.
The Diamond Sutra of the Chinese Tang dynasty, the oldest dated printed book in the world, found at Dunhuang, from 868 CE

Papermaking is the process of manufacturing paper and cardboard, which are widely used for printing, writing, and packaging, and numerous other purposes. Today almost all paper is made using industrial machinery, while handmade paper survives as a specialized craft and a medium for artistic expression.

In papermaking[1], a dilute suspension consisting mostly of separate cellulose fibres in water is drained through a sieve-like screen, so that a mat of randomly interwoven fibres is laid down. Water is further removed from this sheet by pressing, sometimes aided by suction or vacuum, or heating. Once dry, a generally flat, uniform and strong sheet of paper is achieved.

Before the invention and current widespread adoption of automated machinery, all paper was made by hand, formed or laid one sheet at a time by specialized laborers. Even today those who make paper by hand use tools and technologies quite similar to those existing hundreds of years ago, as originally developed in China and other regions of Asia, or those further modified in Europe. Handmade paper is still appreciated for its distinctive uniqueness and the skilled craft involved in making each sheet, in contrast with the higher degree of uniformity and perfection at lower prices achieved among industrial products.

History

[edit]
Main article: History of paper

The word "paper" is etymologically derived from papyrus, Ancient Greek for the Cyperus papyrus plant. Papyrus is a thick, paper-like material produced from the pith of the Cyperus papyrus plant which was used in ancient Egypt and other Mediterranean societies for writing long before paper was used in China.[2] Papyrus is prepared by cutting off thin ribbon-like strips of the pith (interior) of the Cyperus papyrus plant and then laying out the strips side-by-side to make a sheet. A second layer is then placed on top, with the strips running perpendicular to the first. The two layers are then pounded together using a mallet to make a sheet. The result is very strong, but has an uneven surface, especially at the edges of the strips. When used in scrolls, repeated rolling and unrolling causes the strips to come apart again, typically along vertical lines. This effect can be seen in many ancient papyrus documents.[3]

Early Xi'An hemp paper, dated to at least 87 BC

Hemp paper had been used in China for wrapping and padding since the eighth century BC.[4] Paper with legible Chinese writings on it has been dated to 8 BC.[5] The traditional inventor attribution is of Cai Lun, an official attached to the Imperial court during the Han dynasty (202 BC – 220 CE), said to have invented paper about 105 CE using mulberry and other bast fibres along with fishnets, old rags, and hemp waste.[6] Paper used as a writing medium had become widespread by the 3rd century[7] and, by the 6th century, toilet paper was starting to be used in China as well.[8] During the Tang dynasty (618–907 CE) paper was folded and sewn into square bags to preserve the flavour of tea,[4] while the later Song dynasty (960–1279 CE) was the first government to issue paper-printed money.

In the 8th century, papermaking spread to the Islamic world, where the process was refined, and machinery was designed for bulk manufacturing. Production began in Samarkand, Baghdad, Damascus, Cairo, Morocco, and then Muslim Spain.[9] In Baghdad, papermaking was under the supervision of the Grand Vizier Ja'far ibn Yahya. Muslims invented a method to make a thicker sheet of paper. This innovation helped transform papermaking from an art into a major industry.[10][9] The earliest use of water-powered mills in paper production, specifically the use of pulp mills for preparing the pulp for papermaking, dates back to Samarkand in the 8th century.[11] The earliest references to paper mills also come from the medieval Islamic world, where they were first noted in the 9th century by Arabic geographers in Damascus.[12]

Traditional papermaking in Asia uses the inner bark fibers of plants. This fiber is soaked, cooked, rinsed and traditionally hand-beaten to form the paper pulp. The long fibers are layered to form strong, translucent sheets of paper. In Eastern Asia, three traditional fibers are abaca, kōzo and gampi. In the Himalayas, paper is made from the lokta plant.[13] This paper is used for calligraphy, printing, book arts, and three-dimensional work, including origami.

In Europe, papermaking moulds using metallic wire were developed, and features like the watermark were well established by 1300 CE, while hemp and linen rags were the main source of pulp, cotton eventually taking over after Southern plantations made that product in large quantities.[13] Papermaking was originally not popular in Europe due to not having many advantages over papyrus and parchment. It was not until the 15th century with the invention of the movable type of printing and its demand for paper that many paper mills entered production, and papermaking became an industry.[14][15]

Modern papermaking began in the early 19th century in Europe with the development of the Fourdrinier machine. This machine produces a continuous roll of paper rather than individual sheets. These machines are large. Some produce paper 150 meters in length and 10 meters wide. They can produce paper at a rate of 100 km/h. In 1844, Canadian Charles Fenerty and German Friedrich Gottlob Keller had invented the machine and associated process to make use of wood pulp in papermaking.[16] This innovation ended the nearly 2,000-year use of pulped rags and start a new era for the production of newsprint and eventually almost all paper was made out of pulped wood.

Manual

[edit]
Woodcuts depicting the five seminal steps in ancient Chinese papermaking. From the 1637 Tiangong Kaiwu of the Ming dynasty.[17]

Papermaking, regardless of the scale on which it is done, involves making a dilute suspension of fibres in water, called "furnish", and forcing this suspension to drain through a screen, to produce a mat of interwoven fibres. Water is removed from this mat of fibres using a press.[18]

The method of manual papermaking changed very little over time, despite advances in technologies. The process of manufacturing handmade paper can be generalized into five steps:

  1. Separating the useful fibre from the rest of raw materials. (e.g. cellulose from wood, cotton, etc.)
  2. Beating down the fibre into pulp
  3. Adjusting the colour, mechanical, chemical, biological, and other properties of the paper by adding special chemical premixes
  4. Screening the resulting solution
  5. Pressing and drying to get the actual paper

Screening the fibre involves using a mesh made from non-corroding and inert material, such as brass, stainless steel or a synthetic fibre, which is stretched in a paper mould, a wooden frame similar to that of a window. The size of the paper is governed by the open area of the frame. The mould is then completely submerged in the furnish, then pulled, shaken and drained, forming a uniform coating on the screen. Excess water is then removed, the wet mat of fibre laid on top of a damp cloth or felt in a process called "couching". The process is repeated for the required number of sheets. This stack of wet mats is then pressed in a hydraulic press. The fairly damp fibre is then dried using a variety of methods, such as vacuum drying or simply air drying. Sometimes, the individual sheet is rolled to flatten, harden, and refine the surface. Finally, the paper is then cut to the desired shape or the standard shape (A4, letter, legal, etc.) and packed.[19][20]

The wooden frame is called a "deckle". The deckle leaves the edges of the paper slightly irregular and wavy, called "deckle edges", one of the indications that the paper was made by hand. Deckle-edged paper is occasionally mechanically imitated today to create the impression of old-fashioned luxury. The impressions in paper caused by the wires in the screen that run sideways are called "laid lines" and the impressions made, usually from top to bottom, by the wires holding the sideways wires together are called "chain lines". Watermarks are created by weaving a design into the wires in the mould. Handmade paper generally folds and tears more evenly along the laid lines.

The International Association of Hand Papermakers and Paper Artists (IAPMA) is the world-leading association for handmade paper artists.

Handmade paper is also prepared in laboratories to study papermaking and in paper mills to check the quality of the production process. The "handsheets" made according to TAPPI Standard T 205 [21] are circular sheets 15.9 cm (6.25 in) in diameter and are tested for paper characteristics such as brightness, strength and degree of sizing.[22] Paper made from other fibers, cotton being the most common, tends to be valued higher than wood-based paper.[23]

Industrial

[edit]
Main article: Paper machine
See also: Paper mill and Pulp and paper industry
The Tervakoski Paper Mill in Tervakoski, Janakkala, Finland

A modern paper mill[when?] is divided into several sections, roughly corresponding to the processes involved in making handmade paper. Pulp is refined and mixed in water with other additives to make a pulp slurry. The head-box of the paper machine called Fourdrinier machine distributes the slurry onto a moving continuous screen, water drains from the slurry by gravity or under vacuum, the wet paper sheet goes through presses and dries, and finally rolls into large rolls. The outcome often weighs several tons.[citation needed]

Another type of paper machine, invented by John Dickinson in 1809, makes use of a cylinder mould that rotates while partially immersed in a vat of dilute pulp. The pulp is picked up by the wire mesh and covers the mould as it rises out of the vat. A couch roller is pressed against the mould to smooth out the pulp, and picks the wet sheet off the mould.[24][25]

Papermaking continues to be of concern from an environmental perspective, due to its use of harsh chemicals, its need for large amounts of water, and the resulting contamination risks, as well as the carbon sequestration lost by deforestation caused by clearcutting the trees used as the primary source of wood pulp.[26]

Notable papermakers

[edit]
Main page: Category:Papermakers

While papermaking was considered a lifework, an exclusive profession for most of its history, the term "notable papermakers" is often not strictly limited to those who actually make paper. Especially in the hand papermaking field there is currently an overlap of certain celebrated paper art practitioners with their other artistic pursuits, while in academia the term may be applied to those conducting research, education, or conservation of books and paper artifacts. In the industrial field it tends to overlap with science, technology and engineering, and often with management of the pulp and paper business itself.

Some well-known and recognized papermakers have found fame in other fields, to the point that their papermaking background is almost forgotten. One of the most notable examples might be that of the first humans that achieved flight, the Montgolfier brothers, where many accounts barely mention the paper mill their family owned, although paper used in their balloons did play a relevant role in their success, as probably did their familiarity with this light and strong material.

Key inventors include James Whatman, Henry Fourdrinier, Heinrich Voelter and Carl Daniel Ekman, among others.

By the mid-19th century, making paper by hand was extinct in the United States.[27] By 1912, fine book printer and publisher, Dard Hunter had reestablished the craft of fine hand paper making but by the 1930s the craft had lapsed in interest again.[27] When artist Douglass Howell returned to New York City after serving in World War II, he established himself as a fine art printmaker and discovered that art paper was in short supply.[27] During the 1940s and 1950s, Howell started reading Hunter's books on paper making, as well as he learned about hand paper making history, conducted paper making research, and learned about printed books.[28][29]

See also

[edit]

Notes and references

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Papermaking

View on Grokipedia
from Grokipedia
Papermaking is the industrial and artisanal process of producing by suspending plant-derived fibers in to form a thin mat on a screen, which is then pressed to remove excess and dried to create a cohesive sheet suitable for writing, , and . Originating in around 105 CE, when court official Ts'ai Lun developed a method using mulberry bark, rags, and fishnets mashed into pulp, pressed, and sun-dried, it offered a cost-effective alternative to cumbersome slips and expensive for recording . This innovation spread westward, reaching the by the via captured Chinese papermakers and arriving in by the 13th century with the establishment of mills in , which accelerated the transition from and , enabling widespread , the preservation of texts, and the eventual mechanization of production in the using wood pulp. Modern papermaking relies on chemical or mechanical pulping of wood fibers—such as from or —to yield high-volume output via continuous Fourdrinier machines that form, press, dry, and finish sheets at speeds up to 5,000 feet per minute, supporting global demands for communication, products, and sustainable where over 60% of U.S. mills incorporate recovered . By democratizing knowledge dissemination and fostering technologies, papermaking fundamentally advanced human , from administrative in ancient empires to the scientific revolutions of later eras.

History

Invention in Ancient China

Archaeological excavations have uncovered the earliest known paper fragments from the Western Han dynasty (206–9 BCE), predating the traditionally attributed invention. A hemp-based paper fragment, dated to approximately 179 BCE, was discovered in Tomb 5 at the Fangmatan site near Tianshui in Gansu Province, China, consisting of crude, fibrous sheets formed from plant materials. Similar hemp wrapping paper from around 100 BCE has been identified, indicating rudimentary papermaking techniques involving soaking and pounding fibers into a pulp. These early specimens, often irregular and used for wrapping rather than writing, demonstrate that paper-like materials existed over two centuries before official records. In 105 CE, during the Eastern Han dynasty (25–220 CE), court official presented an improved papermaking method to Emperor He, standardizing the process for broader use. 's technique utilized mulberry tree bark, hemp fibers, old rags, and fishnets, which were macerated in water, beaten into a pulp with wooden mallets, and formed into thin sheets via a screen mold. This innovation produced more uniform, durable suitable for writing, surpassing the limitations of heavy bamboo slips and expensive . Cai Lun's contributions, documented in historical texts like the Hou Hanshu, elevated papermaking from sporadic craft to imperial technology, enabling efficient record-keeping and scholarly dissemination in ancient . While earlier fragments suggest evolutionary development rather than singular invention, his refinements marked a pivotal advancement in material efficiency and quality.

Spread Across and to the Islamic World

Papermaking techniques spread from to neighboring regions in during the early centuries CE. In Korea, paper imports began in the third century CE, with local production established by the sixth century CE, facilitating the creation of early woodblock prints and . Techniques reached around 610 CE, introduced by Korean Buddhist monks, who adapted the process using local mulberry bark (kozo) for durable sheets used in and ; by 770 CE, Empress Shōtoku commissioned the first large-scale of Buddhist charms on . adopted papermaking by the third century CE, likely through direct cultural exchange with , though production remained small-scale compared to later Islamic adaptations. The transmission to the Islamic world occurred via following the in 751 CE, where Abbasid forces, allied with Karluk Turks, defeated a Tang Chinese army near the Talas River (modern ). Chinese prisoners, including papermakers, were captured and relocated to , where they instructed locals in the craft, marking the first documented production outside by around 752 CE; this replaced imported Chinese and silk-based alternatives. From , the technology diffused westward under Abbasid patronage, with the first water-powered established in in 794 CE, enhancing efficiency through mechanical pounding and with for smoother, more durable sheets suitable for . Papermaking proliferated across the Islamic caliphates, reaching and other Syrian centers by the late eighth century, by approximately 850 CE with mills in producing high-quality rag paper from and , and by 1100 CE. Islamic artisans refined the Chinese method by incorporating rags as primary fiber (yielding stronger paper than plant-based Chinese variants), introducing sizing for ink resistance, and standardizing formats, which supported the Abbasid House of Wisdom's efforts and the proliferation of manuscripts; by 972 CE, surviving Quranic manuscripts on attest to its dominance over . These innovations, driven by demand for administrative records and scholarly works, positioned the Islamic world as a hub for paper production until the Mongol invasions disrupted Central Asian centers in the thirteenth century.

Introduction to Europe and Early Mills

Papermaking reached through contact with the Islamic world, particularly via the under Muslim rule, where had been produced since the early following its adoption from earlier Arab centers like and . Imported began appearing in European records by the , initially used for documents and ledgers in regions like and , gradually displacing due to its lower cost and availability. The technology's transfer was facilitated by Muslim artisans and merchants, with evidence of production in by 1056, as noted in contemporary sources describing mills in places like (Játiva). The earliest documented European paper mills emerged in during the , with the first permanent facility established in around 1144, utilizing water-powered mechanisms adapted from Islamic to process rags into pulp. These mills relied on and rags as primary fibers, sourced from worn textiles, reflecting Europe's limited access to plant-based alternatives prevalent in . By the late , production spread northward; saw the founding of mills in Fabriano by 1276, where innovations like from animal hides improved paper durability and writing surface quality, enabling high-volume output for the burgeoning book trade. Fabriano's facilities, operational by 1264, marked a shift to specialized rag collection and water-driven stamping for pulp beating, enhancing efficiency over manual methods. In France, the first mill at Troyes dates to 1288, leveraging local water resources for mechanical processing, while production expanded into the Low Countries and Germany by the 14th century, with Nuremberg's 1390 mill representing the first major facility north of the Alps. Early European mills typically employed wooden stampers powered by water wheels to break down fibers, followed by manual sheet formation in molds, pressing, and air-drying, yielding thinner, more uniform sheets than initial imports but still prone to inconsistencies without advanced filtration. This mechanization, borrowed from grain milling traditions, allowed for scalability, with Italy alone hosting over 300 mills by 1300, fueling the demand for printed materials post-Gutenberg. Despite initial resistance from parchment guilds, paper's economic advantages—requiring fewer animal hides and enabling faster production—drove its dominance, though quality varied regionally until standardization efforts in the Renaissance.

Industrialization from the 18th to 19th Centuries

In the late , European papermaking remained labor-intensive and reliant on and rags, with production limited by manual processes using vats and moulds, yielding only a few hundred sheets per day per worker. Rising demand from the and administrative needs during the exacerbated rag shortages, prompting innovations in mechanization. French engineer Louis-Nicolas Robert invented the first continuous papermaking machine in 1798 while employed at the Essonnes mill near , featuring an endless wire belt to form a continuous web of from pulp . This prototype, patented in 1799, marked the initial shift toward industrialized production but faced implementation challenges due to mechanical unreliability and financial constraints. The technology advanced in when brothers Henry and Sealy Fourdrinier acquired Robert's rights in 1801 and collaborated with engineer Bryan Donkin to refine the design into the Fourdrinier machine, which produced a uniform continuous sheet via a moving wire mesh, felts for pressing, and heated cylinders for drying. The first operational Fourdrinier machine began producing commercially in 1807 at Frogmore Mill in , enabling output rates vastly exceeding hand methods—up to 400 feet per minute by mid-century refinements. Adoption spread rapidly in the , with steam power replacing water wheels for consistent operation, and the first U.S. Fourdrinier installed in 1827 at , boosting domestic production from rag-based mills. Rag supply constraints persisted, leading to experiments with alternative fibers; in 1843, German inventor Friedrich Gottlob Keller developed mechanical grinding of into groundwood pulp, providing a cheaper, abundant . By the 1860s, chemical pulping methods, such as the soda process introduced by American Hugh Burgess in 1851, allowed efficient wood fiber extraction, transitioning the industry from rags to wood pulp and enabling scales that supported widespread and . Global paper output surged, with U.S. production rising from 90,000 tons in 1860 to over 1 million tons by 1890, driven by these mechanized and material innovations.

20th Century Expansion and Modernization

The marked a period of unprecedented expansion in the papermaking industry, fueled by rising global demand for newsprint, , and sanitary products amid , improvements, and consumer goods proliferation. In the United States, the pulp and paper sector exhibited sustained output growth throughout the century, supporting in forested regions like and the . Worldwide production escalated dramatically, reaching 323 million metric tons by 2000, reflecting the shift from artisanal to mass-scale operations. Modernization efforts centered on the widespread adoption of the kraft (sulfate) pulping process, which produced stronger fibers suitable for packaging and corrugated board, supplanting earlier sulfite methods. Invented by Carl F. Dahl in 1879 and first commercialized in a Swedish mill in , kraft pulping gained traction in the early 20th century, particularly in the American South where 15 mills operated by 1930 using southern pine. By 1937, it had become the dominant chemical pulping technique globally due to its higher yield and versatility with resinous woods. Innovations in recovery boilers during the enabled efficient of pulping chemicals, reducing costs and enhancing . Advancements in machinery and processes further boosted efficiency, with paper machines achieving higher speeds and automation in stock preparation and finishing. Multistage bleaching techniques refined in the early 1900s improved whiteness and strength without excessive fiber degradation. Post-World War II, integrated mills combining pulping, papermaking, and power generation proliferated, particularly in and , enabling . In , capacity expansions from 1900 to 1939 positioned the country as a major exporter, comprising nearly 25% of global kraft pulp production by mid-century. These developments transformed papermaking into a cornerstone of industrial economies, though they also intensified resource demands on timber supplies.

Raw Materials

Primary Fiber Sources

The primary fiber sources for papermaking consist of lignocellulosic materials rich in , primarily derived from woody plants, with wood pulp dominating global production. Wood fibers, obtained from trees, serve as the principal raw material, comprising approximately 90% of fibers used in papermaking worldwide. These fibers are categorized into softwoods from coniferous (e.g., , , ), which yield long fibers (typically 3-5 mm) valued for tensile strength and durability in products like and tissue, and hardwoods from deciduous (e.g., , , poplar), providing shorter fibers (about 1 mm) that enhance opacity, smoothness, and printability in writing and printing papers. Softwoods generally have higher content (20-30%), requiring more intensive pulping to isolate , while hardwoods contain less (15-25%) but demand blending for balanced paper properties. Non-wood fibers constitute a minor but regionally significant portion of primary sources, accounting for roughly 5-10% of global pulp production, often utilized in areas with limited forest resources such as parts of and . Common non-wood sources include agricultural residues like and , sugarcane , and , which offer shorter fibers (0.5-2 mm) suitable for specialty papers but pose challenges in processing due to higher silica content and variability in yield. Bast fibers from like , , and provide strong, elongated strands historically used in high-quality papers, though their use remains limited to niche applications owing to higher costs and supply inconsistencies compared to . linters and recycled rags, derived from seed hairs and waste, supply premium short fibers for fine papers and , but represent less than 1% of total production due to competition from synthetic alternatives and availability constraints. The preference for stems from its abundance, consistent morphology, and established pulping , enabling scalable production of over 180 million metric tons of chemical and mechanical pulp annually.

Pulping Techniques

Pulping techniques convert lignocellulosic raw materials, primarily wood chips, into a fibrous by separating fibers from and other non-fibrous components. The process aims to maximize fiber yield while preserving fiber length and strength for subsequent papermaking, with methods differing in use, chemical inputs, yield, and resulting pulp quality. Mechanical pulping relies on physical forces to or refine , achieving high yields of 90-95% by retaining most of the original mass, including , which results in shorter fibers prone to yellowing but suitable for low-cost, high-volume products like newsprint and tissue. Subtypes include stone groundwood pulping, where logs are pressed against a rotating under , and refiner mechanical pulping, which uses grooved discs to shear chips; thermomechanical pulping adds pretreatment to soften , reducing energy needs by up to 70% compared to non-thermal methods while improving fiber flexibility. These processes consume significant —often 2-4 MWh per air-dried of pulp—but enable of with minimal chemical . Chemical pulping employs alkaline or acidic solutions to dissolve selectively, yielding 45-55% fiber content with longer, stronger fibers ideal for high-quality papers such as and grades, though it generates more and requires recovery systems for chemicals. The dominant kraft () process, accounting for over 80% of global chemical pulp production since the 1930s, cooks chips in and at 160-170°C under , recovering up to 95% of cooking chemicals via evaporation and for self-sufficiency. pulping, using or bisulfite variants, produces brighter pulps for specialty papers but has declined due to odor issues and lower strength; soda pulping, an alkaline method without sulfur, suits non-woody fibers like . Hybrid approaches, such as chemi-thermomechanical pulping (CTMP), combine mild chemical pretreatment (e.g., ) with mechanical refining to achieve yields of 80-90% and enhanced brightness over pure mechanical methods, balancing cost and quality for board and hygiene products. Semi-chemical pulping, like neutral sulfite semi-chemical (NSSC), applies partial delignification before mechanical defibration, yielding pulps with improved uniformity for corrugating medium. Emerging biological pulping uses fungi to degrade pre-refining, potentially cutting energy by 30-50%, though scalability remains limited as of 2023.

Additives and Fillers

Fillers and additives are non-fibrous materials incorporated into paper pulp to enhance specific such as optical , strength, dimensional stability, and , while often reducing production costs by partially substituting expensive fibers. Fillers primarily contribute to , opacity, and , whereas additives address functional aspects like water resistance and particle retention. Their addition typically occurs during the wet-end stage of papermaking, where compatibility with pulp —often alkaline for modern processes—is critical to avoid agglomeration or reduced efficacy. Common fillers include precipitated calcium carbonate (PCC), ground calcium carbonate (GCC), and kaolin clay, which together account for the majority of filler usage in fine paper production. PCC, produced via of lime , offers high (over 90% ISO) and fine (0.5–2 μm), enabling up to 20–30% loading without significant strength loss when retention aids are used. GCC, derived from grinding , provides a coarser, blocky morphology suited for opacity in grades, comprising about 20–25% of filler content in many mills. Kaolin, a hydrated aluminum , enhances sheet and receptivity due to its platy , though it imparts lower than carbonates and is more common in acid papermaking systems. Other fillers like and serve niche roles: talc for pitch control and hydrophobicity, and TiO2 for superior opacity at low loadings (1–2%) via high . Additives encompass a range of chemicals that mitigate drawbacks of fillers, such as reduced fiber bonding and poor retention. Retention aids, often cationic copolymers, flocculate fines and fillers to increase their incorporation into the sheet, achieving retention rates above 80% in high-filler systems and improving drainage. Dry strength agents, including starches and acrylamide-based polymers, counteract the 10–20% tensile strength drop from filler addition by promoting interfiber hydrogen bonding, with dosages typically at 0.5–2% based on dry pulp. agents like (AKD) or alkenyl succinic anhydride (ASA) render paper water-resistant by reacting with hydroxyl groups on fibers, essential for filled papers prone to . Wet strength resins, such as polyamide-epichlorohydrin, provide permanent bonding in tissue and grades, enduring beyond mechanical breakdown. The mechanistic role of these materials involves surface interactions: fillers scatter light for opacity via refractive index mismatch with cellulose (e.g., CaCO3 at 1.6 vs. at 1.5), while additives modify for aggregation. High filler content (15–40% in office papers) demands precise control to balance cost savings—fillers can reduce needs by 10–20%—against properties like tear strength, which declines due to disrupted networks. Recent advancements include modified fillers with cationic for better retention without compromising coefficient. Overall, selection depends on end-use: graphic papers favor high-brightness carbonates, while prioritizes strength additives.

Manual Papermaking Process

Preparation of Pulp

In manual papermaking, pulp preparation transforms raw fibrous materials—primarily recycled linen or cotton rags in European traditions, or bast fibers from plants like hemp or mulberry in Asian methods—into a fibrillated slurry suitable for sheet formation. The process emphasizes mechanical and mild chemical breakdown to preserve fiber length and strength, avoiding the harsh treatments of industrial pulping. Rags, the dominant source until the 19th century, were sorted by female laborers into up to six quality grades, with finer linens reserved for premium papers to ensure uniformity and minimize impurities like dyes or contaminants. Cut rags, typically into pieces no larger than 2 inches (5 cm) to aid , undergo initial cleaning by hand-washing or dusting to remove dirt, grease, and non-fibrous debris. In European mills from the 14th to 18th centuries, the core softening step involved in large stone basins (approximately 16 x 10 x 3 feet or 4.9 x 3 x 0.9 meters), lasting 5-6 weeks; water was added and drained 8-10 times daily for the first 10 days to promote bacterial decomposition of pectins and lignins, followed by 15-20 days of standing. Lime () was occasionally added to accelerate breakdown or halt over-, though excessive use weakened the resulting paper. Softened material is then boiled in alkaline solutions, such as derived from wood ashes () or lime water, for several hours to dissolve remaining impurities and swell fibers without excessive degradation; temperatures reached near (around 100°C), with durations varying by rag quality but typically 4-8 hours in documented 18th-century practices. This yields a semi-processed "half-stuff" that is drained and ready for mechanical action. Beating follows in water-powered stamp mills or troughs equipped with wooden mallets, a labor-intensive step powered by waterwheels since the late medieval period. Initial malleting breaks down clumps over 6-12 hours, transitioning to prolonged fibrillation for 12-24 hours or more, producing a pulp at 5.6%-6.7% solids consistency (56-67 grams per liter) with continuous flushing to remove solubilized waste. In multi-stage refinement, as described in 18th-century texts like Lalande's Art de faire le papier, the pulp is pressed into cakes, mellowed for about one week to enhance hydration and bonding potential, then re-beaten 2-3 times until resembling a flour- . For plant-based fibers, preparation parallels rags but starts with retting: stems are soaked in rivers or dew for days to weeks to enzymatically separate bast fibers, followed by stripping, chopping, alkaline cooking (e.g., in soda ash solutions at 80-100°C for 2-4 hours), and beating; Chinese methods from the CE emphasized mortar-and-pestle maceration over chemicals to retain integrity. The resulting pulp is screened for knots or and adjusted for vat use, typically diluting to 0.5%-1.0% solids before sheet formation.

Sheet Formation and Couches

In manual papermaking, sheet formation occurs by dipping a mold—a rectangular frame fitted with a fine wire or laid wires—covered by a , a removable edging frame that retains the pulp within defined boundaries, into a vat containing a dilute suspension of prepared s in . The mold and deckle assembly is submerged at an angle, then lifted level to capture an even layer of pulp, with the thickness controlled by the fiber concentration and lift speed, typically yielding wet sheets of 0.05 to 0.2 mm before pressing. Excess drains through the mesh under gravity, while the papermaker imparts directional shakes—forward-backward and side-to-side—to redistribute fibers, them randomly, and achieve uniform density and orientation, minimizing defects like flocs or weak spots. Couching follows immediately to transfer the fragile wet sheet from the mold to an absorbent support. The is removed, and the mold is inverted onto a damp felt or similar couch, with gentle pressure applied to release the sheet via capillary wicking and adhesion, preventing fiber disruption. , traditionally woven prized for their matted texture and water absorption capacity, stack alternately with sheets to form a for later pressing, a technique refined in European mills by the to enable with twin molds. This step ensures the sheet's integrity during handling, as premature drying on the mold could cause cracking, and historically sourced from provided optimal moisture transfer without contaminating the pure mat. Modern variants may use synthetic or pellon for durability, but remains standard for artisanal work due to its proven efficacy in even .

Pressing, Drying, and Finishing

In manual papermaking, pressing follows sheet formation and couching, where stacks of wet sheets alternated with felts are subjected to mechanical to expel excess and consolidate fibers. This step typically employs a screw press or weighted boards, applying gradual force to avoid while removing up to 70-80% of remaining , resulting in denser, more cohesive sheets that retain around 50% dampness. Drying commences immediately after pressing, with sheets separated from felts to prevent and then air-dried to evaporate residual through natural or controlled . Traditional methods include flat air- on clean surfaces like screens or boards, which preserves texture but risks warping if unmanaged; restraint drying, where sheets adhere to felts or pellons under light tension to maintain flatness; and loft drying, a historical European technique involving hanging sheets in ventilated spaces to promote even from edges inward over several hours to days. Accelerated drying via low- ovens at approximately 50-60°C or sources can reduce times to 1-2 hours without compromising , though over-drying risks . Finishing refines the dried sheets for specific uses, primarily through to impart water resistance and calendering to enhance smoothness and density. involves applying a warm solution of animal (often with as a ) via brushing, dipping, or tub-sizing on one or both sides, followed by re-drying to form a thin, hydrophobic that minimizes ink feathering; vegetable starches serve as alternatives in modern variants for vegan compatibility. Calendering then compresses the sized sheets between polished metal plates or rollers under sustained , aligning fibers for a glossy, uniform surface suitable for or , with historical hand methods using weighted stacks achieving comparable results to early calenders introduced in the . These processes, rooted in pre-industrial practices, directly influence final paper qualities like opacity, strength, and dimensional stability.

Industrial Papermaking Process

Mechanical Pulping and Refining

Mechanical pulping processes separate lignocellulosic fibers from primarily through physical grinding or defibration, retaining approximately 90-95% of the wood's dry as pulp due to minimal removal. This high yield derives from the mechanical disruption of bonds without chemical dissolution, enabling efficient raw material use but producing pulp with inherent weaknesses: lower tensile strength (typically 20-50% less than chemical pulps), reduced permanence from -induced yellowing under light exposure, and higher demands for separation. Such pulps suit applications like newsprint and tissue, where opacity and bulk outweigh durability needs, as the retained enhances light scattering for print contrast. The foundational groundwood process, originating in the , grinds debarked logs against rotating or synthetic stones under to abrade fibers from the wood matrix. Friedrich Gottlob Keller patented a mechanical wood-grinding apparatus in in 1844, enabling initial trials, though commercialization followed in 1852 via improved grinders by Friedrich Voelter and J.M. in Heidenheim. Yields in groundwood reach 95-98%, but energy intensity—often 10-15 kWh per air-dried —stems from the action's inefficiency against dry wood structure. By 1869, U.S. producer Alfred Denison Remington shipped commercial groundwood newsprint, marking mechanical pulp's scalability for mass demands. Refiner-based methods supplanted pure groundwood for versatility, feeding wood chips into double-disc refiners where opposing grooved plates rotate at 1,500-3,000 rpm to shear and defibrate fibers. Refiner mechanical pulp (RMP), developed post-1950s, achieves 90-92% yield but consumes 20-30 kWh/ due to cold defibration's resistance. Thermomechanical pulping (TMP), introduced in the 1960s, preconditions chips with steam at 100-130°C to plasticize , reducing refining energy to 8-12 kWh/ while boosting fiber flexibility and pulp brightness by 2-5 ISO points via partial softening. Chemi-thermomechanical pulping (CTMP) integrates mild alkaline or sulfite pretreatment (e.g., 2-5% at 120-160°C), yielding 85-90% pulp with 10-20% improved strength over TMP through enhanced fiber swelling and retention, though at added chemical costs of $20-50/. Refining in mechanical pulping entails sequential mechanical shear in multi-stage refiners to fibrillate, shorten, and conform fibers, optimizing papermaking traits like and drainage. Primary defibers chips into shives and fines (5-20% content), secondary stages fibrillate external layers for 10-30% tensile gains via increased surface area (up to 200-300 m²/g), and tertiary fines fibers for , often at 1-2% consistency to minimize loss to water shear. Total refining correlates inversely with yield—higher for RMP (25-40 kWh/) versus TMP (10-20 kWh/)—as steam reduces interfiber friction, but over-refining risks 20-40% strength loss from excessive cutting. Process control metrics, such as Canadian Standard Freeness (CSF) dropping from 500-700 mL to 100-300 mL, quantify refinement, ensuring pulp and shive content below 1% for uniform web formation.

Web Formation on Machines

In the forming section of industrial paper machines, web formation involves depositing a dilute aqueous suspension of pulp fibers, known as with a consistency of approximately 0.5-1% solids, onto a continuously moving endless wire mesh to create a nascent paper sheet. This process, predominant in Fourdrinier-type machines invented in the early , relies on and drainage to consolidate fibers into a wet web while removing excess water. The wire, typically a synthetic or metallic mesh with openings of 0.1-0.3 mm, travels at speeds up to 20 m/s in modern high-speed machines, matching the stock jet velocity to promote even deposition. The headbox serves as the critical entry point, accelerating the stock from low-velocity stock chests to wire speed while distributing it uniformly across the machine width, often 5-10 meters. Hydraulic headboxes, standard since the mid-20th century, use generators or rolls to ensure isotropic orientation and minimize streak defects from uneven flow. Upon exiting the slice—a narrow 5-15 mm high—the stock spreads over the wire, where initial dewatering occurs gravitationally, aided by forming boards and hydrofoils that induce shear and to accelerate drainage without disrupting fiber mat formation. Table rolls provide support, while downstream boxes extract water to raise web consistency to 15-20% before transfer to the press section. Fiber deposition follows a , with mass distribution variations arising from flow decay and local , directly influencing paper formation—a measure of uniformity quantified by variance in transmitted light or beta-gauge scanning. Optimal formation, targeted at standard deviations below 5-10% for fine papers, requires balancing (often 99.5% water), shear rates, and wire tension; excessive yields mottled sheets, while insufficient mixing promotes fiber bundling and weak spots. Twin-wire formers, an alternative to single-wire Fourdriniers, sandwich the between two wires for bilateral drainage, improving formation for heavier grades like board but increasing complexity and energy use. Modern enhancements include gap formers with adjustable slices for multi-ply webs and modeling to predict jet-to-wire velocity differentials, reducing basis weight variations by up to 20%. Despite advances, formation remains sensitive to furnish variability, with chemical additives like retention aids (e.g., cationic polymers at 0.1-0.5% dosage) deployed to enhance drainage and uniformity without compromising sheet strength. Poor web formation correlates with downstream defects, such as print mottle or reduced tensile index, underscoring its foundational role in yield and .

Pressing, Drying, and Post-Processing

In the industrial papermaking , the pressing section mechanically removes from the wet web formed on the , typically increasing solids content from 15-21% entering the section to 35-55% exiting, depending on paper grade and press configuration. This occurs as the web passes through a series of press nips between rolls, often with permeable felts or fabrics that absorb expressed water, supplemented by vacuum boxes to enhance removal rates. Modern designs, such as extended nip or shoe presses, achieve higher efficiencies by applying prolonged pressure over larger areas, reducing reliance on subsequent and yielding savings where a 1% improvement in pressing efficiency correlates to approximately 4% reduction in total . Following pressing, the partially dewatered web enters the drying section, where it is dried to a final content of 4-8% by contact with -heated cast-iron arranged in groups. condenses on the inner cylinder surfaces, transferring to evaporate from the web in phases: initial heating, constant-rate , and falling-rate diffusion-limited . Configurations like multi-cylinder setups with dryer fabrics prevent web adherence and enable pocket ventilation for efficient recovery, with hoods capturing exhaust to minimize loss; cylinder remains dominant due to its cost-effectiveness despite high steam consumption. Post-processing refines the dried web for end-use properties, including calendering, , and optional . Calendering compresses the sheet between heated rolls to smooth the surface, enhancing gloss, , and printability by reducing roughness on micro- and macro-scales. Surface applies or similar binders via , rod, or blade methods to improve fiber bonding, resistance, and dimensional stability without fully penetrating the sheet. For coated grades, pigments and binders are applied to impart opacity, , and ink receptivity, often followed by supercalendering to optimize structure under high pressure. The web is then reeled, slit, and cut into rolls or sheets, with controls ensuring uniformity.

Environmental Impacts

Resource Consumption and Emissions

The pulp and paper industry consumes substantial quantities of , , and raw fibrous materials in the production of approximately 420 million metric tons of and annually worldwide. Water usage in integrated mills typically ranges from 20 to 50 cubic meters per metric ton of product, though advanced facilities with closed-loop systems can achieve reductions to under 10 cubic meters per ton through and treatment technologies. Energy demands are driven primarily by pulping, , and processes, with the sector accounting for about 5% of use, equivalent to roughly 4% of the world's total consumption in . Raw material inputs rely heavily on wood pulp, which constitutes 13–15% of global wood harvest volumes, supplemented by recycled fiber that averts virgin but requires additional processing . Greenhouse gas emissions from the industry stem mainly from fossil fuel combustion for energy and process-related biogenic releases, totaling under 2% of global industrial CO2 emissions in 2022 despite projected production growth. In the United States, direct emissions reached 34.9 million metric tons of CO2 equivalent in 2021, representing 2.5% of industrial GHG output but only about 1% of national totals, with lifecycle analyses showing variability from 608 kg CO2eq per metric ton for efficient grades to 1,978 kg per ton for energy-intensive ones. Other emissions include particulate matter, sulfur oxides, and nitrogen oxides from boilers and recovery furnaces, though regulatory compliance has curbed historical peaks; for instance, U.S. mills reported 42.1 million metric tons CO2eq in 2012, reflecting a downward trajectory amid efficiency gains. Biomass energy utilization, derived from mill residues and black liquor recovery, offsets a portion of fossil dependencies, preventing an estimated 181 million metric tons of CO2 emissions annually in the U.S. alone.

Pollution Sources and Historical Abuses

The pulp and papermaking industry generates significant water pollution through effluents laden with organic compounds such as lignins, hemicelluloses, resins, and fatty acids from the pulping process, alongside inorganic salts and phenols. Bleaching stages introduce chlorinated organics, including chlorophenols and extractable organic halides, which elevate biochemical oxygen demand (BOD) and chemical oxygen demand (COD), depleting dissolved oxygen in receiving waters and harming aquatic ecosystems. These discharges also contain suspended solids that smother benthic habitats. Chlorine-based bleaching historically produced and furans, persistent toxins that bioaccumulate in fish and wildlife, with detectable levels in mill effluents as identified in the U.S. Environmental Protection Agency's (EPA) National Dioxin Study in the late 1980s. Air emissions include (SO2), (H2S), fine particulates, and from combustion processes and recovery boilers, contributing to and respiratory health risks in nearby communities. Solid wastes, such as lime sludge, boiler ash, and treatment sludges containing and organics, often accumulated in landfills or were disposed onsite, leading to contamination. Prior to the U.S. of 1972 and subsequent EPA effluent guidelines, paper mills routinely discharged untreated or minimally treated waste directly into rivers, causing widespread , fish kills, and . In the basin, pre-1970s recycling processes from historic mills deposited persistent contaminants in sediments, necessitating long-term and remediation efforts. The Camas, Washington, emitted uncontrolled SO2 and H2S in the 1960s, producing odors and fallout that blanketed communities, galvanizing local activism and contributing to the environmental awareness that inspired the first in 1970. Dioxin discharges peaked as a concern in the 1980s, with chlorine-bleached kraft mills in regions like Maine contaminating downstream fish populations, as first documented in 1985, leading to consumption advisories and federal cluster rules by 1998 to curb releases. In coastal U.S. areas, 1980s-1990s mill effluents introduced dioxins into sediments and food chains, with legacy hotspots still requiring monitoring and cleanup decades later due to slow degradation. These practices reflected a broader pattern of prioritizing production over environmental safeguards, with under-reporting of emissions persisting into recent years, as a 2025 analysis found U.S. mills omitted significant black liquor and wood combustion pollutants from inventories.

Mitigation Efforts and Sustainability Metrics

The pulp and paper industry has pursued mitigation through expanded recycling programs, which divert significant volumes from landfills and reduce virgin fiber demand; in 2024, the U.S. recycled 60-64% of paper available for recovery, while the European Union achieved 75.1% across graphic, packaging, and tissue grades. These rates reflect investments in collection infrastructure and mill adaptations for recycled content, though export fluctuations and contamination challenges limit further gains. Sustainable forestry certifications mitigate deforestation risks by verifying chain-of-custody for wood fibers; the Programme for the Endorsement of Forest Certification (PEFC) covers 294 million hectares globally, with many paper producers sourcing from such managed to maintain fiber supply without net forest loss. (FSC) standards emphasize biodiversity and community rights, applying to 100% certified or recycled fibers in labeled products, though PEFC's mutual recognition with systems like SFI broadens adoption in . Water conservation efforts include closed-loop systems and advanced treatment, yielding reductions of over 40% in some U.S. mills since 1990 via ion-exchange and technologies; industry averages hover at 54 cubic meters per metric ton of output, with targets like a 25% cut by 2030 in select operations. Smart metering and regeneration approaches further minimize freshwater intake, though and remain barriers to full closure. Energy efficiency and emissions controls leverage from residuals, which supplants fossil fuels and cuts greenhouse gases; U.S. mills derive much of their power from this, enabling potential net-zero CO2 by 2050 through and advances that boost by 3% per 1% pre-dry water removal. with carbon capture and low-carbon fuels offer additional pathways, despite historical declines of 1% annually since 2010.
Sustainability MetricValueScope/YearNotes
Paper Recycling Rate60-64%U.S., 2024Includes all grades; cardboard at 69-74%
Paper Recycling Rate75.1%EU, 2024Covers graphic, packaging, tissue
Water Use54 m³/tonneGlobal averagePer metric ton of pulp/paper; reductions via reuse
Certified Forest Area294 million haGlobal, PEFCSupports fiber sourcing without net loss
GHG Reduction PotentialNet-zero CO₂ by 2050U.S. industry projectionVia biomass, electrification

Innovations and Challenges

Key Technological Breakthroughs

The Fourdrinier , developed in the early 19th century, marked a pivotal shift from handmade sheets to continuous web formation, enabling scalable industrial production. French engineer Louis-Nicolas Robert conceived the initial concept in 1799 while working at the Essonnes mill, patenting a machine that formed on an endless belt of wire mesh. British stationers Henry and Sealy Fourdrinier, in collaboration with engineer Bryan Donkin, refined and commercialized the design, securing key patents between 1801 and 1807; the first operational Fourdrinier machine began producing in 1803 at Frogmore Mill in , . This innovation dramatically increased output—from mere hundreds of sheets per day by hand to thousands of feet of continuous web—by automating sheet formation, pressing, and initial drying, though early machines were limited by wire durability and required manual intervention for finishing. Parallel advancements in pulping addressed the bottleneck, as traditional rag-based fibers could not sustain rising demand from presses. Mechanical pulping, rediscovered in , used grindstones to defibrillate wood logs against water-cooled surfaces; German weaver Friedrich Gottlob Keller patented the process in 1843–1844, producing groundwood pulp suitable for newsprint but yielding weaker, yellower fibers prone to aging. Chemical pulping followed to extract stronger : the soda process, employing , emerged in the 1850s, while the or —cooking wood chips in a and liquor— was invented by Carl F. Dahl in 1879, with U.S. Patent 296,935 granted in 1884. The kraft method yielded pulp up to 50% stronger than predecessors, tolerated diverse wood species like and , and enabled recovery for energy and chemical reuse, reducing costs and waste; commercial adoption accelerated after the first sulfate mill opened in around 1890. These breakthroughs collectively transformed papermaking from a reliant on scarce textiles into a wood-fiber industry capable of mass output, underpinning the explosion in and by the late . By , wood pulp accounted for over 80% of global production, with machine speeds evolving from 10–20 feet per minute in early Fourdriniers to over 1,000 feet per minute by mid-century through refinements in felts, vacuum systems, and multi-cylinder drying. Subsequent innovations, such as twin-wire formers in the , further enhanced uniformity and reduced energy use, but the foundational 19th-century developments remain the core enablers of modern scalability.

Recent Developments Since 2020

Since 2020, the has accelerated adoption of alternative fibers to reduce reliance on virgin wood pulp, with and emerging as viable renewables due to faster growth cycles and lower water needs compared to traditional trees. For instance, pulp toilet paper production scaled via startups like Bampoo, founded in 2020, targeting markets projected to reach USD 74.99 billion by 2030 at a 5.67% CAGR from 2023. Similarly, agricultural residues such as roadside grasses and non-wood fibers have been valorized for chemical-free papermaking, enabling sustainable production with reduced environmental impact, as demonstrated in pilot processes yielding viable sheet strength. These shifts address concerns while maintaining pulp quality, though scalability remains challenged by fiber variability. Nanocellulose additives, including microfibrillated cellulose (MFC) and nanocellulose crystals (NCC), have advanced papermaking by enhancing tensile strength, retention, and barrier properties without synthetic chemicals, with applications in coatings and composites post-2020. Reviews indicate nanocellulose improves paper filtration and dewatering efficiency, potentially cutting energy use in drying stages by up to 20% in lab trials. Industrial integration, such as in through-air-drying (TAD) for tissue, has boosted absorbency while lowering fiber consumption, aligning with biodegradable packaging demands like the Frugal Bottle, which uses 94% recycled paperboard for a carbon footprint six times lower than glass. Automation and AI have optimized mill operations, with IoT sensors enabling and real-time pulp quality monitoring, reducing downtime by 15-30% in implemented systems. AI-driven process controls, including for in web formation and , have proliferated since 2020, supporting a market projected to reach USD 14.7 billion by 2034 at 7.9% CAGR. for fiber characterization and further minimize defects, enhancing yield in high-speed machines. Recycling rates reflect resilience amid supply chain disruptions, reaching 79.3% in in 2023 and 67.9% in the in 2022, bolstered by de-inking technologies and innovations. for eco-pulping, using enzymatic steam processes, has gained traction to cut chemical use, while packaging demand—now 42.5 million tons annually in the —offsets declines in paper, driving overall production stability. These developments prioritize causal efficiencies in resource use over unsubstantiated green claims, with verifiable metrics underscoring progress toward net-zero goals.

Ongoing Debates and Economic Pressures

Ongoing debates in the papermaking industry center on the tension between stringent environmental regulations and maintaining economic competitiveness, with proponents of aggressive decarbonization arguing that long-term gains outweigh short-term costs, while industry stakeholders contend that rapid compliance mandates exacerbate profitability pressures without proportional global emission reductions. For instance, a 2024 study on the European paper sector highlights that while energy efficiency improvements and utilization could reduce by up to 20-30% in some mills, the upfront capital investments—often exceeding €50 million per facility—strain smaller operators amid volatile energy prices. Critics, including reports from industry analysts, note that uneven international regulations create competitive disadvantages for regions like and , where mills face tighter emission caps under frameworks like the EU Emissions Trading System, compared to less-regulated producers in . This disparity fuels arguments for harmonized global standards to prevent "," where production shifts to lower-regulation jurisdictions, potentially undermining domestic jobs and incentives. Another focal debate involves the viability of recycled content mandates versus virgin fiber use, with environmental advocates pushing for higher rates to curb —global production consumed approximately 420 million metric tons of in 2023, about 40% from recycled sources—yet economic analyses reveal that inconsistent supply and quality of recyclables increase processing costs by 10-15% due to and energy-intensive de-inking. Industry data indicates that while reduces , over-reliance can degrade paper strength and raise treatment expenses, prompting calls for balanced policies that incentivize both collection and sustainable . These discussions are complicated by issues, as academic and NGO reports often emphasize ecological harms without fully accounting for certified sustainable practices that have stabilized wood supply chains in regions like . Economic pressures have intensified since 2023, driven by surging energy costs—natural gas prices in spiked over 200% in 2022-2023, accounting for 20-30% of mill operating expenses—and volatility, with pulp prices fluctuating 15-25% annually due to disruptions from geopolitical events like the Russia-Ukraine conflict. The digital shift has further eroded demand for and writing papers, which declined 5-7% yearly globally from 2020-2024, leading to mill closures and capacity reductions totaling over 2 million tons in alone by mid-2025. Packaging segments show resilience, buoyed by e-commerce growth projecting a 4-6% CAGR through 2029, but overcapacity from Asian expansions has depressed prices and margins to below 5% in oversupplied markets. Labor shortages and , including OSHA safety upgrades and effluent discharge limits, add 5-10% to operational costs, prompting productivity-focused digital transformations like AI-optimized refining to offset a historical 1.6% annual decline in output per input. Despite these headwinds, U.S. industry capacity stabilized at around 80 million tons in 2024-2025, with consumption holding steady through reliance on sustainable pulp grades.

Economic and Cultural Role

Global Industry Scale and Trade

The global produces over 400 million metric tons of paper and annually, with demand driven primarily by applications that constitute approximately 65% of output. In 2023, total production reached levels supporting this scale, though exact figures vary by source due to differences in categorizing and specialty papers; projections estimate an increase to 476 million tons by 2032 amid rising and needs. China dominates production, outputting 134 million metric tons in 2023—roughly 32% of the world total—bolstered by domestic demand and export capacity, though its share has stabilized after rapid expansion in prior decades. The United States ranks second, with paper and paperboard capacity at 79.7 million tons in 2023, reflecting a 1.6% decline from the prior year due to mill closures and shifts toward recycled content. Other leading producers include , , , , , and , which together account for much of the remaining volume, often specializing in high-value grades like printing paper or pulp exports. The industry's economic footprint exceeds $340 billion in annual market value as of 2024, encompassing pulp, paper, and converted products, with packaging segments driving over half of revenues amid transitions from plastics. Trade in paper goods totaled $295 billion in 2023, down 10.6% from 2022 due to supply chain disruptions and softening demand in printing sectors, while export volumes hovered between 90 and 110 million metric tons globally. Major exporters include China and European nations like Germany and Finland, which supply pulp and specialty papers to import-heavy regions such as Asia-Pacific and North America; however, intra-regional trade predominates, with net importers like the United States relying on Canadian pulp to offset domestic shortages.
CountryApproximate Production (million metric tons, 2023)
134
79.7 (capacity)
~25 (estimated from rankings)
~20 (estimated from rankings)
This table summarizes leading producers based on available data; precise figures for non-top-tier nations fluctuate with economic cycles and reporting standards. imbalances persist, with pulp exports from boreal regions like and supporting paperboard manufacturing in emerging markets, though tariffs and sustainability regulations increasingly shape flows.

Notable Papermakers and Contributions

, a and court official in the Eastern of , is credited with developing a systematic papermaking process in 105 CE by combining mulberry bark, fibers, rags, and fishnets into a pulp that was pressed and dried into sheets, presenting this innovation to Emperor He for its utility in record-keeping and communication. This method marked a significant advancement over prior rudimentary forms using individual plant materials, enabling scalable production that facilitated the spread of and in ancient , though archaeological evidence suggests proto-paper existed earlier from around 200 BCE. In the early 19th century, French engineer Louis-Nicolas Robert patented the first continuous papermaking machine in 1799 while working at a mill in Essonnes, France, which used a moving wire mesh to form a wet web of pulp into an unbroken sheet, addressing the inefficiencies of handmade sheets limited to small sizes and low output. English stationers Henry and Sealy Fourdrinier acquired rights to Robert's design and, collaborating with engineer Bryan Donkin, refined it into the Fourdrinier machine, with the first successful prototype operational by 1807 at Frogmore Mill in , England, capable of producing paper at speeds up to 16 meters per minute and revolutionizing industrial-scale production by mechanizing the forming, pressing, and drying stages. This innovation reduced labor costs by over 90% compared to manual methods and enabled the of newsprint, fueling the expansion of newspapers and books during the , though initial implementations faced technical challenges like web breakage resolved through iterative engineering. Other contributors include the anonymous artisans in the Islamic world who, after papermaking reached via Chinese prisoners in 751 CE following the , adapted water-powered mills and sizing techniques with starch from rice or wheat to enhance durability, establishing the first outside by the 8th century and disseminating the craft to Europe via by the 10th century. In the United States, early industrialists like the Rittenhouse family operated the first colonial in 1690 near , using rag-based processes that supported presses amid growing demand, though innovations remained incremental until adopting European machinery post-1800. These developments underscore papermaking's evolution from artisanal craft to mechanized industry, driven by empirical refinements in fiber processing and machinery rather than singular breakthroughs.

References

  1. https://extension.okstate.edu/fact-sheets/basics-of-paper-manufacturing.html
  2. https://www.afandpa.org/history-paper
  3. https://www.domtar.com/national-inventors-month-paper/
  4. https://www.historyofinformation.com/detail.php?id=5027
  5. https://www.cabinet.ox.ac.uk/origins-paper
  6. https://paper.gatech.edu/early-papermaking
  7. https://www.historyofinformation.com/detail.php?id=152
  8. https://www.ebsco.com/research-starters/technology/papermaking-spreads-korea-japan-and-central-asia
  9. https://paper.gatech.edu/sites/default/files/2021-04/History%20of%20Papermaking%20Around%20the%20World.pdf
  10. https://www.hqpapermaker.com/paper-history/
  11. https://archive.aramcoworld.com/issue/199903/revolution.by.the.ream-a.history.of.paper.htm
  12. https://www.1001inventions.com/paper/
  13. https://paper.lib.uiowa.edu/european.php
  14. http://aic.stanford.edu/sg/bpg/annual/v05/bp05-11.html
  15. https://www.linkedin.com/posts/tradecomandunisource_paper-industry-history-activity-7308702838740705281-7Qt6
  16. https://www.kurzke.co.uk/theory-thursday-rag-paper/
  17. https://paper.gatech.edu/sites/default/files/2021-04/History%2520of%2520Papermaking%2520Around%2520the%2520World.pdf
  18. https://en.troyeslachampagne.com/discover/made-in-troyes/the-city-of-the-novel/troyes-home-to-frances-first-paper-mill/
  19. https://scarc.library.oregonstate.edu/omeka/exhibits/show/mcdonald/printing/paper
  20. https://brill.com/display/book/9789004506848/BP000009.xml?language=en
  21. https://blogs.loc.gov/bibliomania/2024/12/05/papermaking-a-rags-to-riches-story/
  22. https://philadelphiaencyclopedia.org/essays/paper-and-papermaking/
  23. https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=1124&context=charleston
  24. https://www.historyofinformation.com/detail.php?id=433
  25. https://multimediaman.blog/2016/04/24/nicholas-louis-robert-1761-1828-papermaking-machine/
  26. https://www.ferrotype.co.uk/blog/the-history-of-papermaking-part-ii
  27. https://paper.gatech.edu/advent-paper-machine
  28. https://www.cepi.org/19th-century-emergence-of-wood-based-paper-and-increased-mechanisation/
  29. https://digitalcommons.library.umaine.edu/context/mainehistoryjournal/article/1053/viewcontent/45_1_Article5.pdf
  30. https://www.researchgate.net/publication/298521292_Paper_market_world%27s_paper_industry_at_the_turn_of_the_century_Part_II_Production_of_papers
  31. https://www.tappi.org/content/Events/19PEERS/19PEE59.pdf
  32. https://www.jstor.org/stable/26474512
  33. https://www.paperandwood.com/en/articlesitem/?aid%2C39/the-history-of-papermaking.html
  34. https://posey17.wordpress.com/2013/02/16/the-paper-revolution-of-the-1940s/
  35. https://www.ebsco.com/research-starters/chemistry/pulp-and-paper-chemistry
  36. https://thecanadianencyclopedia.ca/en/article/pulp-and-paper-industry
  37. https://www.pulpandpaper-technology.com/articles/pulp-and-paper-manufacturing-process-in-the-paper-industry
  38. https://www.afandpa.org/news/2024/what-paper-pulp
  39. https://www.pulpandpaper-technology.com/articles/chemical-pulping-methods
  40. https://www.paperpulping.com/news/what-is-the-type-and-process-of-pulp.html
  41. https://pmc.ncbi.nlm.nih.gov/articles/PMC10675330/
  42. https://www.sciencedirect.com/science/article/abs/pii/S0144861711001317
  43. https://pmc.ncbi.nlm.nih.gov/articles/PMC7697407/
  44. https://bioresources.cnr.ncsu.edu/resources/fillers-for-papermaking-a-review-of-their-properties-usage-practices-and-their-mechanistic-role/
  45. https://www.sciencedirect.com/science/article/abs/pii/S0032591015002806
  46. https://hubbepaperchem.cnr.ncsu.edu/additives-and-ingredients/
  47. https://pmc.ncbi.nlm.nih.gov/articles/PMC5295721/
  48. https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/papermaking
  49. https://onlinelibrary.wiley.com/doi/abs/10.1002/0471238961.1601160504211201.a01
  50. https://www.researchgate.net/publication/230873996_Inorganic_filler-modification_and_retention_during_papermaking_A_review
  51. http://www.handmakingpaper.com/plant-pulps
  52. https://www.handpapermaking.org/post/preparing-pulp
  53. https://cool.culturalheritage.org/don/dt/dt1706.html
  54. https://paperslurry.com/blog/2016/03/31/making-handmade-paper-with-a-deckle-box-part-2
  55. https://www.researchgate.net/publication/38106934_Handmade_paper_A_review_of_its_history_craft_and_science
  56. https://vgpaper.com/smallsheet.html
  57. https://www.handpapermaking.org/post/couching
  58. https://mountainscholar.org/bitstreams/56132437-9d14-454d-bb2c-dc63c6730dc8/download
  59. https://www.handpapermaking.org/post/couching-and-felts
  60. http://ihl.enssib.fr/paper-and-watermarks-as-bibliographical-evidence/a-history-of-handmade-paper-the-basic-problem
  61. https://www.handpapermaking.org/post/wet-pressing-and-consolidation
  62. https://helenhiebertstudio.com/how-do-you-press/
  63. https://helenhiebertstudio.com/drying-techniques/
  64. https://www.handpapermaking.org/post/drying-paper
  65. https://www.echocommunity.org/resources/3127985b-5e63-4f3f-9202-6f04676806ee
  66. https://www.naturalpigments.com/artist-materials/sizing-paper-gelatin
  67. https://www.handpapermaking.org/magazine-articles/nineteenth-century-papers-sizing-does-matter
  68. https://www.conservation-wiki.com/wiki/Calendered
  69. https://paper.gatech.edu/washi/washi-finishing
  70. https://www.princeton.edu/~ota/disk1/1989/8931/893104.PDF
  71. https://www.yuanhuapaper.com/mechanical-pulping-vs-chemical-pulping-in-papermaking-process/
  72. https://research.fs.usda.gov/treesearch/38599
  73. https://www.sarkengg.in/post/types-of-pulp-refining-techniques-essential-guide
  74. https://www.svpaper.in/history-of-papermaking/
  75. https://www.fibrelab.ubc.ca/files/2013/01/Topic-3.2-Mechanical-Pulping-RefinerPulps.pdf
  76. https://ippta.co/wp-content/uploads/2025/07/A-review-of-the-traditional-pulping-methods-and-the-recent-developments.pdf
  77. https://www.sciencedirect.com/topics/engineering/pulp-refining
  78. https://bioresources.cnr.ncsu.edu/wp-content/uploads/2022/04/1985.1.413.pdf
  79. https://www.fibrelab.ubc.ca/files/2013/01/Topic-13-Papermaking-Forming-Lecture.pdf
  80. https://www.astenjohnson.com/img/chapter-previews/chapter-2.pdf
  81. https://www.fibrelab.ubc.ca/files/2013/01/Topic-13-Papermaking-Forming-text.pdf
  82. https://bioresources.cnr.ncsu.edu/wp-content/uploads/2020/02/1989.3.73.pdf
  83. https://theconiferous.com/what-is-the-pressing-theory-and-the-factors-affecting-water-removal-on-press/
  84. https://www.valmet.com/insights/articles/up-and-running/new-technology/BPWetPressEfficiency/
  85. https://www.astenjohnson.com/media/2812/expertip-7-paper-machine-water-calculations.pdf
  86. https://ud-machine.com/blog/paper-press-section/
  87. https://www.vectorsolutions.com/courses/paper-machine-drying/
  88. http://gaspaperdryer.org/learn-about-paper-drying/paper-drying/
  89. https://www.fibrelab.ubc.ca/files/2013/01/Topic-15-Papermaking-Drying-text.pdf
  90. https://bioresources.cnr.ncsu.edu/wp-content/uploads/2020/03/2001.1.709.pdf
  91. https://www.voith.com/corp-en/papermaking/drying-concepts.html
  92. https://www.sciencedirect.com/science/article/abs/pii/S0169433210006677
  93. https://www.sciencedirect.com/science/article/abs/pii/S092401360900096X
  94. https://www.knowpap.com/www_demo_version/english/paper_technology/general/6_finishing/frame.htm
  95. https://www.valmet.com/insights/articles/up-and-running/performance/FRCalenderingVariables/
  96. https://www.deskera.com/blog/paper-manufacturing-process-how-paper-is-made/
  97. https://kunakair.com/environmental-impact-paper-industry/
  98. https://www.globalefficiencyintel.com/pulp-and-paper-industry
  99. https://www.worldwildlife.org/our-work/forests/pulp-and-paper/
  100. https://www.iea.org/energy-system/industry/paper
  101. https://www.sciencedirect.com/science/article/pii/S2666278724000369
  102. https://bioresources.cnr.ncsu.edu/resources/life-cycle-carbon-footprint-analysis-of-pulp-and-paper-grades-in-the-united-states-using-production-line-based-data-and-integration/
  103. https://19january2017snapshot.epa.gov/sites/production/files/2016-11/documents/pulp_and_paper_2012_ip_110416.pdf
  104. https://www.afandpa.org/news/2023/reducing-greenhouse-gas-emissions-paper-manufacturing
  105. https://www.sciencedirect.com/science/article/abs/pii/S2468584419300479
  106. https://www.epa.gov/archive/epa/aboutepa/epa-regulate-dioxin-paper-industry.html
  107. https://www.princeton.edu/~ota/disk1/1989/8931/893105.PDF
  108. https://ippta.co/wp-content/uploads/2021/01/IPPTA-Silver-jubliee-Vol.-II-1989-62-Environmental-Pollution-Due-to-Pulp.pdf
  109. https://kalamazooriver.org/learn/what-are-the-problems/historic-paper-mills-and-cont-sediments/
  110. https://therevelator.org/camas-first-earth-day/
  111. https://www.nrcm.org/wp-content/uploads/2024/02/maine-dioxin-problem.pdf
  112. https://undark.org/2022/11/28/in-coastal-communities-the-toxic-legacy-of-pulp-and-paper-mills/
  113. https://environmentalintegrity.org/news/pollution-from-the-u-s-paper-industry-is-vastly-under-reported-new-study-reveals/
  114. https://www.afandpa.org/news/2025/paper-industry-announces-2024-us-paper-recycling-rates
  115. https://www.cepi.org/press-release-european-paper-recycling-council-reports-strong-recycling-rates-for-2024/
  116. https://www.packagingdive.com/news/american-forest-paper-recycling-rate-cardboard-occ-2024/757483/
  117. https://www.pefc.org/
  118. https://accenton.accentopaque.com/sfi-fsc-pefc-how-to-choose-sustainably-made-paper
  119. https://www.porthawkesburypaper.com/ph-forestry-certification.html
  120. http://www.mntap.umn.edu/industries/facility/paper/water/
  121. https://www.fluencecorp.com/pulp-and-paper-industry-water-use/
  122. https://www.swmintl.com/newsroom/swm-water-reduction-2030/
  123. https://www.johncrane.com/en/resources/blog/water-waste-reduction-in-pulp-and-paper-mills-part-2
  124. https://www.sciencedirect.com/science/article/abs/pii/S2214714423001630
  125. https://www.pnnl.gov/publications/role-pulp-and-paper-industry-achieving-net-zero-us-co2-emissions-2050
  126. https://cnr.ncsu.edu/news/2025/10/electric-power-could-bring-paper-mills-to-net-zero-emissions/
  127. https://www.sciencedirect.com/science/article/pii/S095965262501546X
  128. https://www.historyofpaper.net/paper-history/paper-machine-history/
  129. https://cool.culturalheritage.org/byorg/abbey/ap/ap10/ap10-2/ap10-208.html
  130. https://www.cnpapermachinery.com/kraft-process/
  131. https://www.tstar.com/blog/pulp-and-paper-industry-history-from-papyrus-to-recycled-materials
  132. https://www.sciencedirect.com/science/article/pii/S2369969824000768
  133. https://www.startus-insights.com/innovators-guide/pulp-and-paper-trends/
  134. https://www.nature.com/articles/s41598-024-84358-4
  135. https://bioresources.cnr.ncsu.edu/resources/a-comprehensive-review-of-nanocellulose-modification-and-applications-in-papermaking-and-packaging-challenges-technical-solutions-and-perspectives/
  136. https://paper360.tappi.org/2025/03/31/from-innovation-to-impact-the-transformative-journey-of-the-pulp-and-paper-industry/
  137. https://market.us/report/ai-in-pulp-and-paper-industry-market/
  138. https://www.cepi.org/press-release-in-a-very-difficult-context-pulp-and-paper-industry-has-shown-resilience-in-2023-2/
  139. https://www.snsinsider.com/reports/paper-chemicals-market-7759
  140. https://www.sciencedirect.com/science/article/pii/S0360835224001566
  141. https://www.pulpandpaper-technology.com/articles/top-10-challenges-facing-the-pulp-and-paper
  142. https://www.afry.com/sites/default/files/2023-09/world_paper_market_up_to_2035_2023_edit_a4_final_0.pdf
  143. https://www.afandpa.org/news/2024/what-environmental-impact-paper-industry
  144. https://resources.atradius.us/trends-and-insights/paper-and-pulp-industry-outlook-2025-challenges-trends-and-strategic-shifts/
  145. https://www.emge.com/news/geopolitical-tensions-mill-closures-shape-latest-paper-market-outlook
  146. https://www.resourcewise.com/blog/overview-of-the-global-pulp-and-paper-market-in-q2-2025
  147. https://www.thebusinessresearchcompany.com/report/paper-products-global-market-report
  148. https://www.fastmarkets.com/insights/key-factors-in-global-outlook-paper-packaging/
  149. https://www.mckinsey.com/industries/packaging-and-paper/our-insights/responding-to-productivity-improvement-challenges-in-pulp-and-paper
  150. https://www.afandpa.org/news/2025/afpa-details-us-paper-production-and-capacity-trends
  151. https://www.statista.com/topics/1701/paper-industry/
  152. https://www.tonerbuzz.com/blog/how-much-paper-is-used-each-year/
  153. https://www.yys-machinery.com/news/global-paper-industry-leaders-key-countries/
  154. https://www.afandpa.org/news/2024/afpa-details-us-paper-production-and-capacity-trends
  155. https://statranker.org/economy/top-10-paper-producing-countries-in-2025-global-industry-insights/
  156. https://www.fortunebusinessinsights.com/pulp-and-paper-market-103447
  157. https://www.allianz-trade.com/en_US/resources/sector-reports/paper.html
  158. https://oec.world/en/profile/hs/paper-goods
  159. https://gtaic.ai/trends/paper-industry
  160. https://www.rppaperimpex.com/top-10-largest-paper-producing-countries-in-the-world/
  161. https://www.resourcewise.com/blog/forest-products-blog/2023-pulp-and-paper-industry-year-in-review
  162. https://www.britannica.com/biography/Cai-Lun
  163. https://www.thoughtco.com/invention-of-paper-195265
  164. https://www.sciencedirect.com/topics/engineering/louis-robert
  165. https://www.tappi.org/content/enewsletters/ahead/2017/issues/2017-11-1.html
  166. https://historyofinformation.com/detail.php?id=4510
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