Manufacturing process of 20 D serial polyester fully-drawn yarns through direct spinning and circular blowing

Abstract

The invention relates to a manufacturing process of 20 D serial polyester fully-drawn yarns through direct spinning and circular blowing. Through special design on the process steps of spinning raw material pretreatment, preorientation yarn melt shrinkage processing and fully-drawn yarn direct spinning and circular blowing cooling processing and special optimization of related parameters, damage, caused by acid, alkali and chemical processing, to the fiber elasticity in the prior art is avoided, so that the effect that on the premise of achieving fully-drawn performance, the polyester yarns reach the effect of hydrophilia super-imitation natural fiber without acid, alkali and chemical processing.

Description

technical field [0001] The invention relates to the technical field of drafted yarns, in particular to a production process of direct-spun ring blown 20D series polyester full-drawn yarns. Background technique [0002] In recent years, my country's polyester industry has developed rapidly. The output of polyester fiber has grown from 5.165 million tons at the beginning of 2000 to 12.4 million tons at the end of 2005, with an average annual growth rate of more than 20%. The output has doubled compared with five years ago. many. Polyester has become the synthetic fiber variety with the largest output among chemical fibers, and is widely used in various aspects of national economy and people's livelihood such as clothing, decoration, home textiles, industrial textiles, national defense, and industrial engineering. In the next five years, it will continue to grow rapidly. However, as a textile material, polyester fiber also has obvious disadvantages. Therefore, choosing scien...

AI Technical Summary

Problems solved by technology

[0026] 1. Low production efficiency: the compounding speed of the two-step method is about 800m / min;

[0027] 2. High production cost: The two-step method is that two kinds of fibers are spun separately, wound and then composited through the subsequent process. The production process increases, the equipment investment increases, the floor area is large, the labor cost is high, and the raw material consumption is large. In the production cycle field, the occupation of working capital increases, and the rate of high-quality products is low;

[0028] 3. Unstable quality: the two-step production process is long, with many control points and many influencing factors, making it difficult to control;

The disadvantages of the above preparation method are: in the production process, the three-lobed special-shaped cross-section optical fiber line is merged in the later stage, so that the cohesion between the monofilaments is lacking, and it is easy to bifurcate during the subsequent use; the cohesion between the monofilaments is uneven, and when stretching The tension between the monofilaments is different, and the three-lobed irregular shape is easy to produce uneven clustering, and the monofilaments break to form wool, which affects the subsequent weaving and the flatness of the cloth surface, and cannot meet the post-processing requirements of coarse denier fibers; and conventional spinning The thickest polyester drawn yarn obtained from silk can only reach 300 denier, and the application range is limited

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 spinning performance of post-processing and the intrinsic quality of the final product

At the same time, the modified copolyester chips need to be recrystallized, dried and melted. The process is long, the production links are many, and the production cost is high.