Plastic and nonmetallic article shaping or treating: processes – With twining – plying – braiding – or textile fabric formation
Patent
1997-06-02
1999-02-02
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
With twining, plying, braiding, or textile fabric formation
26421114, 26421115, 26421117, 264237, D01D 5088, D01D 5092, D02G 300
Patent
active
058660550
ABSTRACT:
The present invention pertains to a process for the production of a polyester multifilament yarn having at least 90 mol % ethylene terephthalate with a single filament titer of 1 to 20 dtex, using a central quenching system, characterized in that the method has the following steps: Extrusion of a polyethylene terephthalate polymer melt through a spinneret that has a number of capillaries between 150 and 1500, adjusting a spacer length between 5 and 150 mm, cooling of the obtained threads by means of a constant blown-air speed profile defined in the thread transit direction in that it initially rises very quickly in the region facing the spinneret, then reaches a maximum and subsequently drops off initially very quickly, then more slowly, with the average blown air speed in the vicinity of the threads being between 0.15 and 1.5 m/sec, in such a manner that the undrawn yarn produced from the process has a birefringence of between 0.050 and 0.130, and the coefficient of variation in tenacity at break between the undrawn, single filaments of a yarn amounting to a maximum of 6% with the coefficient of variation in the elongation at break amounting to a maximum of 8%, whereby finally the undrawn yarn is further processed into a finished yarn.
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R. Straub, et al., Quenching System For Melt Spinning Plants, Chemical Fibers International (CFI), vol. 45, Oct. 1995, pp. 372, 374 and 376.
Schwarz Raimund
Stibal Werner
Ems-Inventa AG
Tentoni Leo B.
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