High-strength yarn made through stretch breaking and process for producing the same

Abstract

A spanized yarn constituted by a high strength short fiber containing at least one polymer selected from the group consisting of poly-p-phenylene terephthalamide, poly-p-phenylene benzoxazole, polyethylene, polyvinyl alcohol and wholly aromatic polyester and having a strength of 14 cN / dtex or more, and the high strength short fiber has an average single yarn length of from 50 to 90 cm and a coefficient of variation (CV) in average single yarn length of 50% or less.

Description

technical field [0001] The present invention relates to stretch-cut processed yarn and its manufacturing method. More specifically, the present invention relates to a stretch-cut yarn having a high raw yarn strength retention rate and a small strength variation, and a manufacturing method capable of stably producing the stretch-cut yarn. Background technique [0002] High-strength fibers represented by para-type wholly aromatic polyamide fibers have high heat resistance and high cut resistance, so in the field of clothing applications, they are used as spun yarns for protective clothing applications. However, the spun yarn obtained by using conventional high-strength fibers has a significantly lower strength of the processed yarn (lower strength retention rate) compared with the original yarn before processing, and has the disadvantage that the surface of the spun yarn has a lot of fluff. . Therefore, it is difficult to apply to applications requiring a spun yarn with high...

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Problems solved by technology

However, according to the research of the present inventors, for example, when a spun-like sliver of poly-p-phenylene terephthalamide fiber is produced under the conditions described in the above publication, the strength retention rate and the number of surface fuzz tend to fluctuate.

That is, when poly-p-phenylene terephthalamide fiber is used as the wholly aromatic polyamide fiber, static electricity is generated by friction between single yarns at the time of stretch-cut processing, causing the fiber bundle to significantly expand, and it is turbulent on the roll, Difficult to pull evenly

As a result, the variation in single yarn length increases and the strength retention rate decreases, so even if high-strength fibers are used, the processed yarn suffers from a decrease in strength, an increase in strength deviation, and a significant increase in surface fluff.

[0006] Although prolonging the average single yarn length can improve the above-mentioned problem of lowering the strength retention rate, it is necessary to prolong the stretching length for this purpose, and the fiber bundle is more likely to expand between the rollers, and it is easy to produce the problem of winding the feeding roller and the stretching roller, which is difficult Stable stretch-cutting

[0007] As mentioned above, when using fibers such as poly-p-phenylene terephthalamide fibers, which tend to generate static electricity due to friction between single yarns, it has not been possible to obtain an increase in the average single yarn length and a small deviation in single yarn length. High-quality and high-strength stretch-cut processed yarn, and its manufacturing method has not been seen

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