Method of producing polypropylene yarns

Plastic and nonmetallic article shaping or treating: processes – With twining – plying – braiding – or textile fabric formation

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Details

2642107, 2642108, 26421114, 2642905, 2642907, D01D 516, D01F 606

Patent

active

049024620

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 filament 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 solidification; the filaments are arranged to form a substantially planar array of parallel and mutually distanced yarn strands; then, the filaments are stretched to achieve substantial orientation by passing the yarn strands, while maintaining them in the array, over peripheral surface portions of a sequence of rotating cylinders (141, 142, 143, 144) having parallel axes of rotation, each strand (S) passing over said surface portions along a discrete path which is substantially 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 contact 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.

REFERENCES:
patent: 4347206 (1982-08-01), Roberto

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