Manufacture of filamentary materials by a wet spinning process

Claim 1

PROCESS FOR THE MANUFACTURE OF FILAMENTARY MATERIAL FROM ACETONE-SOLUBLE CELLULOSE ACETATE BY A WET SPINNING PROCESS USING AS THE SPINNING SOLUTION AN ACETONE SOLUTION OF THE CELLULOSE ACETATE, WHICH COMPRISES INITIATING SPINNING BY EXTRUDING THE SPINNING SOLUTION UPWARDLY INTO PETROLEUM ETHER EXTENDING FOR 1/2 TO 1 INCH ABOVE THE LEVEL OF THE ORIFICES THROUGH WHICH THE SOLUTION IS EXTRUDED, DISPLACING THE PETROLEUM ETHER BY A FATTY OIL SELECTED FROM THE GROUP CONSISTING OF COCONUT OIL, PALM OIL, SPERM OIL AND ARACHIS OIL, AT A TEMPERATURE OF 45* TO 70*C. AND MAINTAINING THE HEIGHT OF THE FATTY OIL BATH 12 INCHES ABOVE THE LEVEL OF THE SAID ORIFICES, AND MAINTAINING THE ACETONE CONTENT OF THE OIL AT A VALUE WHICH IS AT MOST EQUAL TO THE HIGHEST CONCENTRATION OF ACETONE IN A BINARY MIXTURE OF THE OIL AND ACETONE AT WHICH A PREVIOUSLY UNSTRETCHED THREAD OF THE CELLULOSE ACETATE, IMMERSED IN THE MIXTURE AT THE SPINNING TEMPERATURE, CAN BE STRETCHED WITHOUT BREAKING BY APPLYING A TENSION OF 1 GRAM PER DENIER FOR 2 MINUTES.