Plastic and nonmetallic article shaping or treating: processes – With twining – plying – braiding – or textile fabric formation
Patent
1988-04-05
1990-02-20
Lorin, Hubert C.
Plastic and nonmetallic article shaping or treating: processes
With twining, plying, braiding, or textile fabric formation
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
Filteco S.p.A.
Lorin Hubert C.
LandOfFree
Method of producing polypropylene yarns does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of producing polypropylene yarns, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of producing polypropylene yarns will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1615033