D - Textiles – Paper – 01 – D
Patent
D - Textiles, Paper
01
D
18/557
D01D 5/08 (2006.01) D01D 5/088 (2006.01) D01D 5/12 (2006.01) D01D 5/16 (2006.01) D01D 13/00 (2006.01) D01F 6/06 (2006.01) D02G 1/00 (2006.01)
Patent
CA 1284567
ABSTRACT Continuous polypropylene multifilament yarns are made by melt spinning and stretching in an integral process; a sufficient number of filaments for forming at least 8 continuous fila- ment yarns each consisting of at least 10 filaments are melt spun through a spinneret (11) at a speed of at least 400 m/ min into a vertical air quenching zone or shaft (12) for sol- idification; the filaments are arranged to form a substanti- ally planar array of parallel and mutually distanced yarn strands; then, the filaments are stretched to achieve subst- antial orientation by passing the yarn strands, while main- taining them in the array, over peripheral surface portions of a sequence of rotating cylinders (141, 142, 143, 144) hav- ing parallel axes of rotation, each strand (S) passing over said surface portions along a discrete path which is substanti- ally defined by a plane intersecting perpendicularly with the parallel axes of the cylinders; each strand is in frictional contact with the peripheral surface portions for a total con- tact path length of from 1000 to 6500 mm and at least 50 %, preferably 75-100 %, of the path length of frictional contact are provided on a total number of from 2 to 6 and preferably 4 large diameter cylinders; the yarn strands are wound as a product at a speed of at least 1000 m/min, e.g. at about 2000 m/min.
563264
Filteco S.p.a.
Ridout & Maybee Llp
LandOfFree
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