In the present invention, in order to solve the problems such as the generation of dyed lines and the strength degradation of the existing polyester fibril yarn and at the same time to express the unique soft characteristics only PTT yarn and organic sulfonic acid metal salt during the polymerization or during the polymerization process Spin by adding the same incompatible material. These yarns prevent the sudden alkali invasion of polyester fiber during the alkali weight loss process, minimizing the rapid decrease in strength and the generation of dyed streaks after weight loss processing, and also gives a very soft touch yarn.
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