Injected melt direct-spinning production process for PET-PTT composite elastic fibers

Abstract

The invention provides an injected melt direct-spinning production process for PET-PTT composite elastic fibers. The process is characterized in that PET is subjected to the polymer-melt directly spinning treatment and PET is subjected to the slice screw melting treatment. After that, the melted PTT is injected into a spinning manifold and then is subjected to the jet spinning treatment at a spinneret orifice together with the PET melt side by side to form a side-by-side wire structure. Finally, composite elastic fibers are prepared and the mass ratio of PET to PTT in the eventually produced composite elastic fibers is 1:1. According to the technical scheme of the invention, the melt direct-spinning treatment of the PET is adopted, so that the special melting process is avoided. The slice screw melting treatment of the PTT is adopted, and the melted PTT is injected into the spinning manifold to be sprayed out as spun fibers together with the PET melt at the injected into a spinning manifold side by side so as to form the side-by-side wire structure. Therefore, the energy is saved, and the melt degradation is reduced. The eventually produced composite elastic fibers are good in quality and the fiber breakage strength thereof is larger than or equal to 2.5 CN / dtex. Meanwhile, the breakage elongation of the composite elastic fibers is larger than or equal to 20%, and the crimp elasticity thereof is larger than or equal to 90%. Therefore, the composite elastic fibers are good in quality.

Description

technical field [0001] The invention relates to a production technology of chemical fiber, in particular to a processing technology of PET-PTT composite elastic fiber. Background technique [0002] PET-PTT is a new type of composite elastic fiber with permanent spiral crimp and excellent bulkiness, elasticity, elastic recovery rate, color fastness and particularly soft hand feeling, which overcomes the classic elastic fiber spandex in high temperature resistance, resistance Disadvantages in alkali and chlorine resistance. [0003] At present, only a few manufacturers of PET-PTT composite elastic fiber are producing domestically, and all of them adopt the process route of chip spinning. At present, no PET-PTT composite elastic fiber has been produced by melt direct spinning by injection method in China. The applicant found in the long-term research and production practice that the main technical difficulties to be overcome are: 1. PET and PTT spinning How to control the te...

AI Technical Summary

Problems solved by technology

At present, no PET-PTT composite elastic fiber has been produced by melt direct spinning by injection method in China.