Differential shrinkage composite fiber and processing method thereof
A composite fiber and different shrinkage technology, which is applied in the processing field of different shrinkage composite fibers, can solve problems such as production process growth, production cycle field, and equipment investment increase, and achieve stable product quality improvement, less investment in equipment transformation, and melt flow. The effect of volume increase
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[0028] To produce a different shrinkage composite fiber with a specification of 47dtex / 48f, the melt direct spinning technology is adopted, and the spinning and winding are synthesized at one time, and the process steps are as follows:
[0029] ① Raw material esterification reaction: the raw material purified terephthalic acid and ethylene glycol are esterified;
[0030] ②Preparation of polyester melt: after the esterification reaction of the raw materials, the polyester melt is prepared through pre-condensation and final polycondensation, and the viscosity of the prepared polyester melt is 0.650;
[0031] ③ Melt delivery: The melt enters the pre-oriented silk spinning box and the full-drawn silk spinning box through two melt distribution pipes, and the pre-oriented silk spinning box and the full-drawn silk spinning The average temperature of the box is 288°C;
[0032] ④ Simultaneous spinning of pre-oriented yarn (POY) and fully drawn yarn (FDY): the melt entering the pre-ori...
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