Preparing method of PET/PTT parallel complex filament with high self-crimpiness

Abstract

The invention discloses a preparing method of a PET / PTT parallel complex filament with high self-crimpiness. PET and PTT are sliced, dried and crystallized, afterwards, the PET and PTT are fused separately and subjected to extrusion molding through a parallel-type spinneret plate, oil is applied after cooling, then level 1-3 drafting and heat setting treatment are adopted, during drafting, the total drafting rate is controlled to be 3-3.5, the level-1 drafting rate is 2.8-3.0, and the temperature is controlled to be 75-80 DEG C. According to the preparing method of the PET / PTT parallel complexfilament with high self-crimpiness, methods like multi-level drafting for increasing the drafting rate are adopted, and the effects of improving the fiber strength, moderately lowering the elongationat break, and greatly improving the self-crimpiness are achieved.

Description

Technical field:

[0001] The invention relates to the field of chemical fibers, in particular to a preparation method of high self-crimping PET / PTT side-by-side composite filaments. Background technique:

[0002] At present, my country's chemical fiber output is huge, but the phenomenon of homogeneity and isomorphism is serious. Composite fiber is an important category of differentiated fibers at present. It is a new type of chemical fiber developed in the 1960s. The side-by-side composite fiber is a composite type in which two components exist side by side and only partially adhered. It is based on the internal crimp mechanism of wool. , a new variety developed using the principles of bionics. The PET / PTT side-by-side composite fiber is a composite fiber with spontaneous crimp obtained through melt composite spinning by utilizing the shrinkage difference between PTT and PET. Due to its relatively low cost, it has gradually realized commercial application.

[0003] At prese...