Polyester false twist processing fiber, production method thereof and textile made of same

The invention relates to a polyester false twist processing fiber. A cross section of the polyester false twist processing fiber is a heterotype cross section containing gaps; and the fiber crystallinity is 25-50%, the crimping elongation is 5-50%, the boiling water shrinkage is 3-20%, and the drying shrinkage is 15-25%. The polyester false twist processing fiber is excellent in crimping performance, a finished product made of gray fabric containing the polyester false twist processing fiber through heat treatment is remarkable in height performance, is excellent in lightweight performance, and has certain thermal insulation performance. 本发明涉及种聚酯假捻加工纤维，所述聚酯假捻加工纤维的横截面为含有空隙的异型截面，且纤维结晶度为25～50%、捲缩伸长率为5～50%、沸水收缩率为3～20%、干热收缩率为15～25%。本发明的假捻加工纤维卷缩性能良好，含有该纤维的坯布经过热处理后制成的成品，其嵩高性明显，轻量性能良好，同时具有定的保温性能。