Jiangsu Hengli Chemical Fibre Co., Ltd.

Ming Chen

Hongwei Fan

Guanfan Jin

Fangming Tang

Lixin Yin

Chaoming Yang

Yongfeng Wang

Xiangming Wang

Huailin Ren

A one-step spun composite DTY and preparation method thereof are provided. The bi-profiled fiber is manufactured with two types of modified polyester of different viscosities through the steps of melting, melt metering, composite extruding, cooling, oiling, drawing, heat setting and winding. Wherein those two modified polyesters have a molecular structure including terephthalic acid segments, ethylene glycol segments and branched diol segments, and the branched diol has a structural formula of 

One-step spun composite DTY and preparation method thereof

A different shrinkage composite yarn and preparation method. The modified polyester is spun with a porous spinneret to produce a different shrinkage composite yarn, and the spinneret holes on the porous spinneret are arranged in an elliptical arrangement. The different shrinkage composite yarn is obtained by winding modified polyester POY yarn and FDY yarn, network recombining, and coiling them. The preparation method of modified polyester is as follows: terephthalic acid reacts with ethylene glycol to produce ethylene terephthalate. The modified polyester is obtained by the reaction of terephthalic acid with branched diol. The fiber of the invention has good properties and the deviation rate of fiber density. The CV value of breaking strength is &#x2264;4.0%, the CV value of elongation at break is &#x2264;8.0%, the CV value of coefficient of variation of coiling shrinkage is &#x2264;8.0%.

Different shrinkage composite yarn and its preparation method

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Wujiang, China

Ming Chen