Method of making a composite elastic yarn
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United States of America Patent
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Jan 9, 1996
Issued Date -
N/A
app pub date -
Apr 21, 1994
filing date -
May 27, 1989
priority date (Note) -
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Abstract
A method of making a composite yarn comprising a spandex core yarn and a thermoplastic wrapping yarn in which both yarns are free to extend and contract freely one relative to the other while retaining sufficient cohesion to prevent their separation. The thermoplastics wrapping yarn is polyamide in a flat continuous filament. The wrapping yarn is wrapped in a series of alternating S and Z twists around the spandex core yarn, loops of the wrapping yarn projecting laterally as at positions where a change in the direction of twist occurs.
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