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DREF friction spinning
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DREF friction spinning
Friction spinning or DREF spinning is a textile technology that is suitable for spinning coarse counts of yarns and technical core-wrapped yarns. DREF yarns are bulky with low tensile strength, making them suitable for blankets and mop yarns. They can be spun from asbestos, carbon fibres and are capable of being made into filters for water systems.[clarification needed] Yarns such as Rayon and Kevlar can be spun using this method. The technology was developed around 1975 by Dr. Ernst Fehrer.
There are three current technologies used today for spinning fibres:
Friction spinning is the fastest of all these techniques though the yarn is irregular and bulkier, making it suitable only for some applications.
The mechanism of yarn formation consists of three distinct operations: feeding of fibres, fibre integration and twist insertion.
The individual fibres are transported by air currents and deposited in the spinning zone. The mode of fibre feed has a particular effect on fibre extent and fibre configuration in yarn and on its properties. There are two methods of fibre feed:
The fibres are fed directly onto the rotating fibre mass that[clarification needed] outer part of the yarn tail.
The fibres are first accumulated on the in-going roll and then transferred to the yarn tail.
The fibres assembles through a feed tube onto a yarn core/tail within the shear field, is provided by two rotating spinning drums and the yarn core is in between them. The shear causes[clarification needed] sheath fibres to wrap around the yarn core. The fibre orientation is highly dependent on the decelerating fibres arriving at the assembly point through the turbulent flow. The fibres in the friction drum have two probable methods for integration of incoming fibres to the sheath. One method, the fibre assembles completely on to perforated drum before their transfer to the rotating sheath. In the other method, fibres are laid directly on to rotating sheath.
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DREF friction spinning AI simulator
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DREF friction spinning
Friction spinning or DREF spinning is a textile technology that is suitable for spinning coarse counts of yarns and technical core-wrapped yarns. DREF yarns are bulky with low tensile strength, making them suitable for blankets and mop yarns. They can be spun from asbestos, carbon fibres and are capable of being made into filters for water systems.[clarification needed] Yarns such as Rayon and Kevlar can be spun using this method. The technology was developed around 1975 by Dr. Ernst Fehrer.
There are three current technologies used today for spinning fibres:
Friction spinning is the fastest of all these techniques though the yarn is irregular and bulkier, making it suitable only for some applications.
The mechanism of yarn formation consists of three distinct operations: feeding of fibres, fibre integration and twist insertion.
The individual fibres are transported by air currents and deposited in the spinning zone. The mode of fibre feed has a particular effect on fibre extent and fibre configuration in yarn and on its properties. There are two methods of fibre feed:
The fibres are fed directly onto the rotating fibre mass that[clarification needed] outer part of the yarn tail.
The fibres are first accumulated on the in-going roll and then transferred to the yarn tail.
The fibres assembles through a feed tube onto a yarn core/tail within the shear field, is provided by two rotating spinning drums and the yarn core is in between them. The shear causes[clarification needed] sheath fibres to wrap around the yarn core. The fibre orientation is highly dependent on the decelerating fibres arriving at the assembly point through the turbulent flow. The fibres in the friction drum have two probable methods for integration of incoming fibres to the sheath. One method, the fibre assembles completely on to perforated drum before their transfer to the rotating sheath. In the other method, fibres are laid directly on to rotating sheath.
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