Process and apparatus for producing hairiness in an open-end spi

Details Process and apparatus for producing hairiness in an open-end spi Process and apparatus for producing hairiness in an open-end spi

1992-08-04

1994-06-28

Hail, III, Joseph J.

Textiles: spinning, twisting, and twining

Apparatus and processes

Open end spinning

57333, D01H 408

Patent

active

053235991

ABSTRACT:
A process and apparatus for treating yarn formed on an open-end spinning machine of the type wherein the yarn is drawn from a rotor through a navel and through draw-off rolls is provided. The yarn is guided from the navel to the draw-off rolls in a path at least a portion of which is inclined with respect to the axis of the navel and a false twist is applied to the yarn during its travel in the inclined portion of the path between the navel and the draw-off rolls. The yarn is permitted to untwist between the false twist application and the draw-off rolls in response to the applied false twist. The untwisting of the yarn causes fiber ends on the surface of the yarn to project outwardly in a hairiness or fleeciness producing manner. The false twist applying element can include a member which produces a rotating air stream about the periphery of the traveling yarn. An initial false twist applying element or elements may be located obliquely at the change of direction location to impart an initial false twist to the yarn.

REFERENCES:
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patent: 4642981 (1987-02-01), Shimano
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patent: 4843812 (1989-07-01), Raasch
patent: 4854119 (1989-08-01), Stahlecker et al.

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