Continuous process for the production of polyacrylonitrile filaments and fibers

US4622195A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Michael Bueb · Leverkusen, DE
• Dieter Paulini · Dormagen, DE
• Edgar Muschelknautz · Leverkusen, DE
• Wolfram Wagner · Dormagen, DE
• Herbert Groschel · Dormagen, DE

Key dates

• Filing date: Mar 6, 1984
• Grant date: Nov 11, 1986
• Expiry date: Mar 6, 2004

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D02G1/122
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Polyacrylonitrile filaments and fibers may be obtained without interruption by spinning the spinning solution into a hot-air spinning duct, washing, drawing, crimping, preparing, steaming, drying cooling and, optionally, cutting at a take-off rate kept at 150 to 400 m/minute and for a tow weight of from 10 to 100 g/m when PA1 (a) the washing process is carried out in several stages on the countercurrent principle and a vibrating duct is used for transporting the spun tow through the washing process, PA1 (b) drawing is carried out before and/or after washing in a steam atmosphere at 100.degree. to 120.degree. C., PA1 (c) crimping is carried out in an aerodynamic crimping unit using a hot, gaseous medium under a pressure of from 5 to 16 bars and at a temperature in the range from 50.degree. to 210.degree. C., PA1 (d) the preparation is continuously applied to the tow before, during or after crimping, PA1 (e) for steaming, the tow is transported through a steaming apparatus in folded form and in the absence of tension on a vibrating duct and, at the same time, treated with steam at 100.degree. to 120.degree. C., PA1 (f) finally, the tow is dried in folded form on a belt dryer using ho…