Method for producing of dry-spun polyacrylonitrile filaments and fibres with a shaped cross-section

• Main Authors: REINEHR, ULRICH, BERNKLAU, KURT, BURGHARTZ, HANS KARL, JUNGVERDORBEN, HERMANN-JOSEF, HERBERTZ, TONI
• Format: Patent
• Language: English; French; German
• Published: 12.05.1982
• Subjects: APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OFARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES ORRIBBONS; NATURAL OR ARTIFICIAL THREADS OR FIBRES; SPINNING; TEXTILES

Polyacrylnitrilfasern und -fäden mit scharfem Querschnittsprofil erhält man nach dem Trockenspinnverfahren dadurch, daß man die Acrylnitrilpolymeren aus einer Lösung verspinnt, die eine Viskosität von mindestens 120 Kugelfallsekunden, gemessen bei 80°C oder von mindestens 75 Kugelfallsekunden, gemessen bei 100°C aufweist, wobei die Düsenlochfläche der Profildüse kleiner als 0,2 mm² und die Schenkelbreite kleiner als 0,17 mm ist. 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 DEG C., or a viscosity of at least 75 falling ball seconds, measured at 100 DEG C. Such solution is dry-spun through one or more nozzles. The nozzle hole are of the profile nozzles being less than 0.2 mm2 and the lateral width being less than 0.17 mm.