Method and apparatus for heat setting false twisted yarn

Claim 1

YARN-TREATING APPARATUS COMPRISING DRAWING MEANS FOR DRAWING THE YARN FROM A PACKAGE AND THROUGH THE APPARATUS AT A CONSTANT RATE, A HEATER ALONG WHICH THE YARN PASSES, MEANS FOR APPLYING FALSE TWIST TO THE YARN SO THAT PART OF THE TWIST RUNS BACKWARDS INTO THE HEATER AND IS SET THEREIN IN THE YARN, A YARN PACKAGE FOR COLLECTING THE YARN, MEANS FOR DRIVING SAID PACKAGE SO THAT ITS PERIPHERAL SPEED IS LESS THAN SAID CONSTANT RATE OF THE DRAWING MEANS, AND PACKAGE-HEATING MEANS FOR HEATING THE YARN WHILE IT IS WOUND ON THE PACKAGE, THE PACKAGEHEATING MEANS CONSISTING OF AN OVEN WHICH IS ARRANGED TO COVER THE YARN PACKAGE AND TO HEAT THE YARN THEREON DURING WINDING OF THE PACKAGE AND IN WHICH A MEANS COOPERATES WITH THE OVEN FOR MAINTAINING AN INNER SURFACE THEREOF AT A SUBSTANTIALLY CONSTANT DISTANCE FROM THE PACKAGE DURING THE WINDING THEREOF.