Apparatus for the wet extrusion of solutions of polymers of vinyl chloride exhibiting a high degree of syndiotacticity

Claim 1

APPARATUS FOR FORMING FIBRES, FILAMENTS AND YARNS BY WET-SPINNING OF SOLUTIONS OF POLYMERS OF VINYL CHLORIDE HAVING A DEGREE OF SYNDIOTACTICITY GREATER THAN 2, WHEREIN THE POLYMER SOLUTION MUST BE MAINTAINED AT A TEMPERATURE HIGHER THAN THAT OF THE COAGULUM BATH, COMPRISING A TANK FOR HOLDING THE COAGULUM BATH PROVIDED WITH AN OPENING IN ITS SIDE WALL; A SLEEVE FIXED TO SAID TANK SIDE WALL AND HAVING AN END IN REGISTRY WITH THE OPENING IN SAID SIDE WALL; A METERING PUMP FOR THE SPINNING SOLUTION, A FILTER AND A SPINNERET CONNECTED IN SEQUENCE AND ENCLOSED BY SAID SLEEVE WITH THE SPINNERET DIRECTED TO DELIVER THE SPINNING SOLUTION THROUGH SAID OPENING IN THE TANK SIDE WALL; MEANS SECURING THE SPINNERET IN THE END OF SAID SLEEVE AND IN RELATION TO THE OPENING IN THE TANK SIDE WALL SO THAT THE SURFACE CONTACT BETWEEN THE SPINNERS AND COAGULUM BATH IS LIMITED ONLY TO THE EXTERNAL FRONTAL SURFACE OF THE SPINNERET; AND MEANS FOR CIRCULATING A HEAT TRANSFER FLUID THROUGH SAID SLEEVE IN HEAT TRANSFER RELATIONSHIP WITH SAID METERING PUMP, FILTER AND SPINNERET.