Friction spinning
AssigneeHollingsworth (U.K.) Limited
InventorAlan Parker
Life of this patent
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Abstract
A friction spinning apparatus and process use at least one perforated roller enclosing a suction sleeve having the static pressure applied along its suction slot changing between a tip end of the fibre bundle forming the yarn and a downstream location of the fibre bundle whereby the tip end is subjected to a weaker suction effect holding it against the surface than is the stronger downstream part of the fibre bundle.
Claims10
In friction spinning apparatus comprising:
- (a) co-operating first and second movable surfaces of which at least said first surface is perforated, said first and second surfaces defining a yarn formation line transverse to which the first and second surfaces move;
- (b) suction means to generate suction within said first surface along a line thereof perpendicular to the direction of movement of the perforated surface;
- and
- (c) means for withdrawing yarn from said co-operating surfaces along a yarn formation line parallel to said suction line;
- the improvement wherein said suction means are effective to ensure that the static pressure within said first surface is different at different locations along said suction line and the static pressure reduces in the yarn withdrawal direction so that weaker suction is exerted at the tip of the forming yarn than at a downstream portion thereof.
In a friction spinning process comprising feeding a stream of fibres onto perforated moving friction spinning surface means while applying suction through said surface means to hold a bundle of said fibres on said moving surface means, the improvement wherein the static pressure differential across said surface means to hold the bundle in contact therewith is lower at the tip end of the forming yarn than at a downstream location thereof.
Dependencies are inferred from the claim text.