First, the nascent fiber prepared in the first step was drawn 30 times in a water bath at 50°C, and then it was heat-set at 90°C for 4 minutes after it was dried.
First of all, the first step of the preparation of primary fiber in the water bath at 50 degrees C stretched 30 times, and then wait for it to dry at 90 degrees C heat shaping 4min.