A processing process of high-modulus low-shrinkage high-colour-fastness polyester filament yarn by direct melt spinning and real-time injection

Abstract

The invention relates to a processing process of high-modulus low-shrinkage high-colour-fastness polyester filament yarn by direct melt spinning and real-time injection. By the special design of steps including subjecting a polyester raw material to shrinkage reducing processing, performing modulus-increasing blending and melting melt processing, performing low-frequency real-time compression and injection, subjecting the melt to multi-stage direct-melting and spinning, passing through a filter screen, spinning, cooling, applying oil, stretching, and the like, and by special optimization of related parameters, the technical difficult problems of fiber in the prior art, namely low modulus, low strength and poor natural-color fasteness are overcome, and the objective of purification, high color fasteness, high modulus and low shrinkage is achieved. Under the obvious improvement on the high color fasteness, the high modulus and the low shrinkage which are good properties, stability, thermal resistance, resistance to hot water, elasticity resilience, elongation and homogeneity are largely improved.

Description

technical field [0001] The invention relates to the field of textile technology, in particular to a processing technology for high-modulus low-shrinkage polyester filaments, and more specifically to a process for melt direct spinning with high color fastness and real-time injection of high-modulus low-shrinkage polyester filaments craft. Background technique [0002] At present, the solid-phase polycondensation melt-spinning process route is widely used at home and abroad to produce polyester industrial yarns, that is, the low-viscosity polyester melt obtained by melt polycondensation is pelletized, dried, crystallized, and solid-phase polycondensed to obtain an intrinsic viscosity of 0.90-1.10. dl / g high-viscosity polyester chips, the chips are dried and melt-spun with a screw extruder. Using this process to produce polyester industrial yarns requires high equipment investment costs, long material turnover cycles, and high energy consumption for production. Due to machine...

AI Technical Summary

Problems solved by technology

[0009]1. Low production efficiency: the two-step composite speed is about 800m / min;

[0010]2. High production cost: the two-step method is that two kinds of fibers are spun separately, wound and compounded in the subsequent process. The production process increases and equipment investment Increase, large area, high labor costs, large consumption of raw materials, short production cycle, increased occupation of working capital, and low rate of high-quality products;

[0011]3. Unstable quality: the two-step method has a long production process, many control points, many influencing factors, and is difficult to control;

[0017]1. Production scale: Chip spinning is limited by the screw extruder and drying system, and the production capacity of the production line is low. Restricted;

[0018]2. Technological process: Chip spinning includes processes such as melt casting, pelletizing, drying, slice transportation, crystallization of slices, re-drying, and melting. The production process is long. , high equipment investment;

[0019]3. Product quality: The main raw material for chip spinning is natural color chips, which are provided for polyester factories. Due to the influence of different batches and manufacturers, it is difficult to guarantee uniform product quality. Moreover, the drying process in the post-processing is mostly intermittent, and the water content of the slices fluctuates greatly, which has a great impact on spinning, so its quality cannot be compared with that of melt direct spinning

The modified copolyester chips produced on the batch polymerization device have large fluctuations in the viscosity and other indicators of the same batch of materials due to different discharge times, and between batches, due to the cracking of the residual melt on the inner wall of the reactor, etc., It is easy to cause differences in product performance between batches, and these problems will directly affect the post-processing spinning performance and the intrinsic quality of the final product; at the same time, the modified copolyester chips need to be recrystallized, dried and melted, which requires a long process and many production links , higher production costs