Production method of composite elastic polyester fiber

The invention discloses a production method of a composite elastic polyester fiber. The composite elastic polyester fiber can be produced by one step, the fiber is stable in elasticity, good in resilience and not prone to aging and replaces covered spandex yarn, and the problem about environmental protection and the problem of aging of spandex are solved. Compared with the traditional two-step method, the one-step production process has the advantages that production energy consumption is reduced, and production efficiency is improved. Besides, compared with single-component PTT (polytrimethylene terephthalate) fiber, by means of the composite spinning production process, raw material cost is reduced, and fabric style is improved. 本发明公开了种复合弹性聚酯纤维的生产方法，可步生产复合弹性聚酯纤维，纤维弹性稳定、回弹性好，不易老化，代替氨纶包覆纱，解决了氨纶环保及老化问题。与传统两步法相比，本发明所述步法生产工艺降低了生产能耗，提高了生产效率。此外，与单组分PTT纤维相比，本发明的复合纺生产工艺降低了原料成本，改善了面料风格。