Plastic article or earthenware shaping or treating: apparatus – Continuous filament forming or film casting means with...
Patent
1989-11-28
1991-12-31
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Continuous filament forming or film casting means with...
264168, 2642108, D01D 516
Patent
active
050767739
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 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 poduct at a speed of at least 1000 m/min, e.g. at about 2000 m/min.
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Fleissner advertisement, International Fiber Journal, Jun. 1990, p. 10.
Davis Robert B.
Filteco S.p.A.
Woo Jay H.
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