Continuous dry-spinning process for acrylonitrile filaments and fibres

US4457884A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Ulrich Reinehr · Dormagen, DE
• Hans Uhlemann · Solingen, DE

Key dates

• Filing date: Jun 17, 1983
• Grant date: Jul 3, 1984
• Expiry date: Jun 17, 2003

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D01D5/04
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Ready-for-despatch filaments and fibres made of acrylonitrile polymers which contain at least 40% by weight of acrylonitrile units can be prepared from a spinning solution in a continuous dry-spinning method in which PA1 (a) the spinning solution spun has a viscosity at 100.degree. C. of 10 to 60 falling-ball seconds, PA1 (b) the evaporation of the solvent in the spinning cell is controlled in such a way that on leaving the spinning cell the solvent content of the filaments is at most 40% by weight, relative to the solids content of the fibre, PA1 (c) before the stretch the filaments are treated with a spin-finish which contains a lubricant and an antistat and gives the filaments a moisture content of at most 10% by weight, relative to the solids content of the fibre, and PA1 (d) before the stretch the filaments have no contact with any other extraction liquid for the spinning solvent.