Cross wound yarn package
AssigneeImperial Chemical Industries PLC
InventorsAllen A. Bloomfield, James R. Goodall
Life of this patent
Estimating the term…
Abstract
The invention comprises (a) an improved cross wound yarn package on which the final few turns of yarn are wound as a compact pile wound bunch on the cylindrical cross wound package surface; (b) apparatus for winding such a package, comprising a fixed pile winding guide (4 in FIG. 3) as well as a traverse guide (1 in FIG. 3) and means effective to move the yarn from one to the other (5 in FIG. 3); and (c) a modified yarn traverse roll with an extra circumferential groove to aid pile winding (2 in FIG. 1) intersecting a helical traverse groove (1 in FIG. 1).
Claims3
A cross wound package of flat melt-spun filament yarn characterised by the outer yarn end being pile wound in a compact bunch on the cross wound package surface, and wherein (i) the bunch comprises at least 20 turns;
- (ii) the coherency, C, of the bunch is at least 100 cm;
- and (iii) the unwinding tension, T, of the bunch is less than 0.5 g/dtex.
Dependencies are inferred from the claim text.