Spinning of high molecular weight polyamide filaments

Claim 1

IN A PROCESS OF MAKING HIGH MOLECULAR WEIGHT SYNTHETIC LINEAR POLYAMIDES INTO FILAMENTS WHEREIN THE POLYAMIDES ARE MELT-SPUN IN THE FORM OF MOLTEN FILAMENTS AND WHEREIN THE FILAMENTS ARE SOLIDIFIED, TREATED WITH STEAM, WOUND UP AND SUBSEQUENTLY UNWOUND AND DRAWN, THE IMPROVEMENT WHICH INCREASES THE MASS RATE OF MELT SPINNING AND DRAWING WITHOUT ADVERSELY AFFECTING THE BIREFRINGENCE AND EXTENSIBILITY OF THE DRAWN FILAMENTS, SAID IMPROVEMENT COMPRISING: INCREASING THE MASS RATE OF MELT SPINNING THE FILAMENTS THEREBY FORMING FILAMENTS OF GREATER DENIER; POSITIVELY FORWARDING THE FILAMENTS, ALMOST IMMEDIATELY AFTER SOLIDIFICATION AND BEFORE TREATING WITH STEAM BY CONTACTING THE FILAMENTS WITH A FORWARDING MEANS, AT A LINEAR SPEED WHICH IS SUBSTANTIALLY EQUAL TO THE LINEAR SPEED OF WINDING UP WHEREBY THE DENIER OF THE WOUND UP FILAMENTS IS INCREASED AND WHEREBY THE FILAMENTS MAY BE DRAWN SUBSEQUENTLY TO A GREATER EXTENT WITHOUT PRODUCING UNDESIRABLE PROPERTIES IN THE DRAWN FILAMENTS.