Process of producing synthetic threads from a polyester-based polymer mixture

US6638456B2 · kind B2 · utility

Assignee

• Zimmer A.G. · DE

Inventors

• Alexander Klein · Troisdorf, DE
• Dietmar Wandel · Hanau, DE

Key dates

• Filing date: May 18, 2001
• Grant date: Oct 28, 2003
• Expiry date: Mar 21, 2022

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D01F6/92
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A first stream of a polyester melt is divided into a second and a third polyester stream, the flow rate of the first stream being 100 to 2000 kg/h and the flow rate of the second polyester stream being 5 to 300 kg/h. 0.2 to 100 kg/h of a molten additive polymer is metered to the second polyester stream, and the additive polymer together with the second polyester stream is passed through a first mixing line. There is obtained a first polymer mixture whose content of additive polymer is 3 to 50 wt-%. The first polymer mixture is introduced into the third polyester stream, the first mixture together with the third polyester stream being passed through a second mixing line and forming a second polymer mixture. The second polymer mixture is extruded to obtain filaments, the filaments are cooled and combined to threads, the threads are unwound with a speed of at least 1000 m/min. The threads are processed to obtain either continuous threads or staple fibers.