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US 5,965,073 AGranted
Process and device for producing polyester yarns
AssigneeJohn Brown Deutsche Engineering GmbH
InventorsRudolf Geier, Jurgen Hartig, Ingo Eiflander
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Abstract
Polyester yarn is produced from melt spun filament by prestretching the filaments individually in counterflow with a gaseous medium and then afterstretching the polyester filaments with an individual titer of 1.0 dtex to 7.5 dtex with a stretching ratio of 1:1.5 to 1:1.15 at a temperature of 80.degree. to 250.degree. C. The filaments are collected and then wound up as a yarn at a speed of 5000 to 8000 m/min.
Claims10
A process for producing a polyester yarn, comprising the steps of:
- (a) melt-spinning polyester filaments;
- (b) cooling the melt-spun polyester filaments to at most a congealing temperature;
- (c) thereafter heating said filaments in counterflow with a gaseous medium to above the glass transition point of said filaments while simultaneously prestretching said filaments;
- (d) thereafter, afterstretching the filaments with an individual titer of 1.0 dtex to 7.5 dtex with a stretching ratio of 1:1.5 to 1:1.15 at a temperature of 80.degree. C. to 250.degree. C.;
- and
- (e) thereafter combining said filaments to a yarn and winding up said yarn at a speed of 5,000 m/min to 8,000 m/min.
3 more elements
Dependencies are inferred from the claim text.