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US 4,790,132 AGranted
Process for making a false twisted differential tension yarn
AssigneeE. I. Du Pont de Nemours and Company
InventorThomas L. Nelson
Life of this patent
Estimating the term…
Abstract
A continuous multifilament crimped polyamide or polypropylene yarn suitable for use in loop pile carpeting and the process for making the yarn including feeding the yarn at different tensions and then treating the yarn with saturated steam is disclosed.
Claims8
A process for making a continuous multifilament crimped polyamide yarn suitable for use in loop pile carpeting comprising the steps of:
- (a) combining at least two multifilament crimped polyamide yarns at different tensions such that the yarns are not overwrapped and feeding such combined yarns through a heating zone in a false-twisted state;
- (b) heating the false-twisted yarns with saturated steam;
- and
- (c) false-twisting the yarns.
1 more element
A process for making a continuous multifilament crimped polypropylene yarn suitable for use in loop pile carpeting comprising the steps of:
- (a) combining at least two multifilament crimped polypropylene yarns at different tensions such that the yarns are not overwrapped and feeding such combined yarns through a heating zone in a false-twisted state;
- (b) heating the false-twisted yarns with saturated steam;
- and
- (c) false-twisting the yarns.
1 more element
Dependencies are inferred from the claim text.