Process of making elastane yarn
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 5, 2003
Grant Date -
N/A
app pub date -
Dec 29, 2000
filing date -
Jun 30, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Described are a process for producing elastane yarn having a linear density of at least 2500 dtex by the wet spinning process and the thereby producible coarse linear density elastane yarn having a wide cross section and a low residual solvent content. The process comprises the steps of spinning an up to 35% strength by weight stable-viscosity elastane solution into a coagulation bath, washing and optionally drawing, drying by contact heating, setting, spin finishing and winding the yarn, the filaments leaving the coagulation bath passing around a diverting roller disposed just above the coagulation bath liquid, the as-spun filament linear density amounting to not more than 1% of the value of the final linear density, the jet stretch ratio being within the range from 0.5 to 50, the contact heating temperature being at least 220.degree. C. and the contact time of the elastane yarn being at least 2 seconds.
First Claim
Other Claims data not available