Drawn commercial yarns of poly ethylene terephthalate (PET) multifilament were heat treated (secondary setting) by infra red heat source on a three-factor heat-treat equipment made by our laboratory.

• 在自制的红外三因素处理机上~[1],用红外加热在定张力下对聚对苯二甲酸乙二酯(PET)成品长丝进行热处理(二次定型)。