Processes for the production of dry-spun polyacrylonitrile profiled fibres and filaments

US4810448A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Ulrich Reinehr · Dormagen, DE
• Kurt Bernklau · Dormagen, DE
• Toni Herbertz · Dormagen, DE
• Hermann-Josef Jungverdorben · Dormagen, DE
• Hans K. Burghartz · Neuss, DE

Key dates

• Filing date: Apr 22, 1987
• Grant date: Mar 7, 1989
• Expiry date: Apr 22, 2007

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D01F6/18
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A process for the production of acrylonitrile fibers and filaments having a precise cross-sectional profile in which filament-forming synthetic polymers are dry-spun from a solution having a viscosity of at least 120 falling bass seconds, measured at 80.degree. C., or a viscosity of at least 75 falling ball seconds, measured at 100.degree. C. Such solution is dry-spun through one or more nozzles. The nozzle hole are of the profile nozzles being less than 0.2 mm.sup.2 and the lateral width being less than 0.17 mm.