Wet-spinning process for tough,ribbon-shaped,acrylonitrile polymer fibers
Abstract
Abstract A HIGH-SPEED WET-SPINNING PROCESS FOR SPINNING RIBBONSHAPED FIBERS OF ACRYLONITRILE POLYMER, SAID FIBERS HAVING AN ASPECT RATIO BETWEEN 2.0 AND 3.0, A COVER FACTOR OF 1.2 TO 1.3, AND IMPROVED ABRASION RESISTANCE, SAID PROCESS COMPRISING THE STEPS OF FORMING A SPINNING SOLUTION OF SAID ACRYLONITRILE POLYMER IS CONCENTRATED AQUEOUS SODIUM THIOCYANATE SOLVENT, EXTRUDING SAID SPINNING SOLUTION THROUGH RECTANGULAR ORIFICES DIRECTLY INTO AN AQUEOUS COAGULATING BATH CONTAINING BETWEEN 22% AND 26% SODIUM THIOCYANATE, SAID BATH BEING MAINTAINED BELOW 10* C., AND EACH OF SAID RECTANGULAR ORIFICES HAVING A SHORT DIMENSION BETWEEN 20 MICRONS AND 200 MICRONS AND A LONG DIMENSION SUCH THAT THE RESULTANT FILAMENT SPUN THEREFROM HAS AN ASPECT RATIO BETWEEN 2.0 AND 3.0, PULLING THE RESULTING FRESHLY-COAGULATED FILAMENTS AWAY FROM THE RECTANGULAR ORIFICES AT A LINEAR VELOCITY ABOVE ABOUT 12 METERS PER MINUTE, WASHING SAID FILAMENTS SUBSTANTIALLY FREE OF SODIUM THIOCYANATE STRETCHING SAID FILAMENT 4 TO 15 TIMES AT A TEMPERATURE ABOVE 65*C., DRYING SAID FILAMENT, AND RELAXING SAID FILAMENT AT A TEMPERATURE ABOVE 100*C.
Inventors
- 👤 E Brigmanis
- 👤 A Maranci
Bibliographic Details
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