Steam-drawing process for yarns

Details Steam-drawing process for yarns Steam-drawing process for yarns

1992-03-12

1993-11-09

Crowder, Clifford D.

Textiles: manufacturing

Thread finishing

Surface modification of running length

28247, 28240, D02J 122

Patent

active

052590984

ABSTRACT:
A process for drawing thermoplastic multifilament yarns, wherein the yarns have different natural draw ratios, at least one of which is greater than the machine draw ratio used in the process. The yarns are first impinged with a hot fluid to heat them to an elevated temperature and then stretched over a set of draw rolls at a single machine draw ratio. In a preferred aspect of the invention, the yarns are crimped after stretching. Preferably, the thermoplastic yarns are either polypropylene or polyamide yarns.

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