Elastane yarn having a linear density of at least 2500 dtex and a cross-sectional width to height ratio of at least 4:1

US6844060B2 · kind B2 · utility

Assignees

• BAYER HEALTHCARE LLC · DE
• Bayer Faser GmbH · DE

Inventors

• Ulrich Reinehr · Dormagen, DE
• Tilo Sehm · Düsseldorf, DE
• Wolfgang Anderheggen · Dormagen, DE
• Toni Herbertz · Dormagen, DE

Key dates

• Filing date: Apr 29, 2003
• Grant date: Jan 18, 2005
• Expiry date: Apr 29, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2967
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

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° C. and the contact time of the elastane yarn being at least 2 seconds.