Abstract:

In order to solve the difficulties in fiber industrialization of the cotton-like co-polyester in melt direct spinning of 200,000 t/a capacity, the technology of contrallable polymerization, the simulation of melt transportation and the process of spinning and drawing in copolyester was studied. The fouth monomer sorbitol was added after first esterification reactor and the third monomer PEG was added before the final polycondensation reaction to produce stable copolyester with indexes meetingrequirements;  and by the simulation of the long-distance melt transportation, it was found that changes of the melt temperature, melt viscosity and the primary hot temperature would affect the melt viscosity drop and the melt temperature drop in the melt transportation process; and the degree of profiles would be controlled by using the cross/hollow spinneret and adjusting the melt temperature, cold blow and take-up speed. The nip twister was used in the false twisting process, thus the obtained cotton-like co-polyester fibers were stable and high in quality.

Key words: cotton-like co-polyester, melt direct spinning, melt transportation, degree of profile