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US 4,228,117 AGranted
Melt spinning process for producing nylon 66 yarns
AssigneeMonsanto Company
InventorsGerald J. Reyenga, Arnold E. Wilkie
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Abstract
The productivity of the conventional melt spinning process for producing undrawn polyhexamethylene adipamide carpet and tire yarns is increased by utilizing a heat feed roll (e.g. 80.degree. C.) rather than an unheated feed roll and by eliminating the conventional steam conditioning of the yarn and the convergence guide(s) associated therewith.
Claims2
A melt spinning process for producing a package of undrawn polyhexamethylene adipamide yarn composed of 140 filaments each having a nominal denier of 30 without conditioning the yarn with steam prior to forming said package, comprising:
- (a) extruding molten fiber-forming polyhexamethylene adipamide at a given rate through a spinneret having at least one set of 140 circular holes to form molten streams,
- (b) cooling said molten streams in a quenching chamber to provide filaments,
- (c) withdrawing said filaments from said quenching chamber,
- (d) passing said filaments with at least a partial wrap around a roll maintained at a temperature ranging from 40.degree. C. to about 150.degree. C. and driven at a given peripheral speed,
- (e) forwarding said filament from said roll to a take-up bobbin onto which the filaments are wound to form said package
- wherein the extrusion rate and said peripheral speed are correlated to provide a yarn having a nominal denier per filament of 30 and an elongation-to-break of not less than 13.0% when the yarn is drawn to a nominal denier per filament of 6.
3 more elements
Dependencies are inferred from the claim text.