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US 5,285,624 AGranted
Arrangement for pneumatic false-twist spinning
AssigneeHans Stahlecker
InventorFritz Stahlecker
Life of this patent
Estimating the term…
Abstract
In the case of an arrangement for pneumatic false-twist spinning, it is provided that a sliver is divided in the area of the delivery roller pair of a drafting unit, is divided into two partial slivers. Edge fibers are spread away during and after the division. The divided slivers are then jointly or separately pneumatically false-twisted and are wound up as an individual yarn, as two separate yarns or as a double yarn.
Claims20
An arrangement for false-twist spinning comprising:
- a drafting unit including a delivery roller pair at its downstream end, said delivery roller pair including a suction roller with two separate suction zones for dividing a sliver behind a nip line of the delivery roller pair into two separated partial slivers,
- a pair of pneumatic false-twisting devices disposed downstream of the drafting unit for applying false twist to the respective partial slivers,
- and edge fiber spreading structure in the form of widening of at least one of the suction zones in the yarn travelling direction for spreading edge fibers away from the respective at least one partial sliver while travelling through the delivery roller pair and before being subjected to ballooning between the delivery roller pair and the false-twisting devices, whereby the spread away fibers are wound around core sections of the at least one partial sliver when the false twist is opened up.
A method of false-twist spinning yarn comprising:
- drafting sliver in a drafting unit including a delivery roller pair at its downstream end, said delivery roller pair including a suction roller with two separate suction zones for dividing the sliver behind a nip line of the delivery roller pair into two separated partial slivers,
- false twisting the two partial slivers in a pair of pneumatic false-twisting devices disposed downstream of the drafting unit for applying false twist to the respective partial slivers, and
- spreading edge fibers away from the respective partial slivers while they are travelling through the deliver roller pair and before they are subjected to ballooning between the delivery roller pair and the false-twisting devices, said spreading edge fibers including passing the slivers over at least one of said suction zones with said at least one suction zone widening in the yarn travelling direction, whereby the spread away fibers are wound around core sections of the partial slivers when the false twist is opened up.
Dependencies are inferred from the claim text.