Arrangement and method for false-twist spinning

A method of a textile spinning in which ends of fibers situated at peripheral edges of a drafted sliver are spread away and are wound around the sliver when a false twist is opened up, comprising:

• drafting a sliver in a drafting unit,
• false twisting the sliver in a false twisting device disposed downstream of the drafting unit,
• and subjecting the sliver to a rotation device at a location intermediate the drafting unit and false twisting device, said rotation device including a rotation body rotatable about an axis which extends essentially perpendicularly with respect to a plane through a nip line of a pair of delivery rollers of the drafting unit, said rotation body including an air-permeable shell surface which is subjected to suction from inside the rotation device,
• wherein a circumferential surface area of the rotation body is engaged by substantially the entire sliver to thereby deflect and guide the sliver between the drafting unit and the false-twisting device,
• wherein the circumferential surface area of the rotating body engaged by the sliver is driven at a speed which is higher than the delivery speed of the drafting unit and higher than the withdrawal speed of a withdrawal device for withdrawing yarn from the false twisting device, such that yarn outer edge fibers are detached from central yarn core regions and are accelerated to a higher speed than the central yarn core regions,
• and wherein the rotation body is arranged directly downstream of the pair of delivery rollers in such a manner that the suction device is effective into the area of the nip line, and wherein a suction slot of the rotation body has a section which extends essentially in the direction of the nip line and which is situated in the area of a deflection of the sliver leaving the pair of delivery rollers which is located in front of this section.

An arrangement for false-twist spinning comprising:

• a drafting unit for drafting sliver,
• at least one false-twisting device arranged downstream of the drafting unit for false-twisting sliver to form a yarn,
• a withdrawal device arranged downstream of the at least one false-twisting device,
• and a guiding element which is arranged between the drafting unit and the false-twisting device, said guiding element being driven to perform rotations around an axis disposed transversely with respect to the yarn travelling direction, said guiding element forming a deflection with a yarn guiding surface moving in the travelling direction of the yarn and configured to cause relative sliding movement of the yarn on the yarn guiding surface,
• wherein the guiding surface is driven at a speed which is higher than the delivery speed of the drafting unit and higher than the withdrawal speed of the withdrawal device such that yarn outer edge fibers are detached from central yarn core regions and are accelerated to a higher speed than the central yarn core regions, and
• wherein said axis of said guiding element extends substantially perpendicularly to a plane through a nip line of a pair of delivery rollers of the drafting unit.

A method of manufacturing spun textile yarn comprising:

• drafting sliver at a drafting unit,
• false-twisting the drafted sliver using at least one false-twisting device arranged downstream of the drafting unit to form a yarn,
• withdrawing the yarn using a withdrawal device arranged downstream of the at least one false-twisting device,
• and applying deflecting forces to the drafted sliver by a guiding element which is arranged between the drafting unit and the false-twisting device, said guiding element being driven to perform rotations around an axis disposed transversely with respect to the yarn travelling direction, said guiding element forming a deflection with a yarn guiding surface moving in the travelling direction of the yarn and configured to cause relative sliding movement of the yarn on the yarn guiding surface,
• wherein the guiding surface is driven at a speed which is higher than the delivery speed of the drafting unit and higher than the withdrawal speed of the withdrawal device such that yarn outer edge fibers are detached from central yarn core regions and are accelerated to a higher speed than the central yarn core regions, and
• wherein said axis of said guiding element extends substantially perpendicularly to a plane through a nip line of a pair of delivery rollers of the drafting unit.