SPIN DRAW PROCESS OF MAKING PARTIALLY ORIENTATED YARNS FROM POLYTRIMETHYLENE TEREPHTHALATE

摘要

A spin draw process for making partially orientated yarn from polytrimethyle ne terephthalate comprising the steps of: (a) extruding and spinning polytrimethylene terephthalate and forming a monofilament or multifilament yarn therefrom, (b) heating the yarn by contacting it with a first pair of godets moving at a temperature to give a yarn temperature above the glass transition temperature and less than the cold crystallization temperature of polytrimethylene terephthalate yarn, (c) moving the yarn between the first godet pair and a second pair of godets, and (d) winding the yarn at a speed of 1 to 15% less than that of the second godet pair and at temperature less tha n the glass transition temperature of polytrimethylene terephthalate yarn.