Process of making cellulose moldings and fibers

US5968434A · kind A · utility

Assignee

• LENZING AKTIENGESELLSCHAFT · AT

Inventors

• Stefan Zikeli · Regau, AT
• Ernst Rauch · Neumarkt am Wallersee, AT
• Hermann Koberger · Zipf, AT
• Friedrich Ecker · Vöcklabruck, AT
• Hartmut Ruf · Rötteln, DE
• Raimund Jurkovic · Lenzing, AT
• Franz Schwenninger · Lenzing, AT

Key dates

• Filing date: Jun 10, 1998
• Grant date: Oct 19, 1999
• Expiry date: Jun 10, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2301/02
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

To prepare cellulose mouldings, a solution of cellulose in a tertiary amine-oxide is moulded in a hot state and the moulded solution is introduced into a precipitation bath in order to precipitate the contained cellulose, wherein the hot moulded solution is cooled before introduction into the precipitation bath. Cooling occurs immediately after the moulding process and preferably consists of blowing air horizontally on to the cellulose moulding. The process according to the invention allows spinning of the cellulose solution with a high fiber density without the spun fibers sticking together after emerging from the spinneret. In spite of the high fiber density, it furthermore allows the use of a long air gap between the spinneret and the precipitation bath, by which means sufficient time is generated in the spinning process to affect the textile properties of the fibers by drawing at the die (FIG. 1).