MELT-SPINNING METHOD AND MELT-SPINNING APPARATUS FOR PRODUCING A CRIMPED YARN
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United States of America Patent
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Issued Date -
Aug 20, 2015
app pub date -
Aug 8, 2013
filing date -
Aug 23, 2012
priority date (Note) -
Abandoned
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Abstract
A melt-spinning method and a melt-spinning apparatus produce a crimped yarn. In this case, by spinning of a plurality of filaments, at least one filament bundle is generated from a thermoplastic polymer, is cooled and drawn and is compressed by means of an air stream in a stuffing chamber into a yarn plug, the yarn plug being opened up into a crimped yarn and being wound into a bobbin. So that the tendency to shrinkage and the crimp resistance on the crimped yarn can be set independently of one another, before compression, the drawn filament bundle is heated, in a first heat treatment for expansion, to a relaxation temperature and, in a second heat treatment for preliminary thermo control, to a crimping temperature. For this purpose, at least one further treatment means for the heat treatment of at least one filament bundle before entry into the stuffing chamber is provided between a drawing device a texturing device.
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