A high shrinkage side by side type composite filament and a method for manufacturing the same

Abstract

The present invention relates to a high shrinkage side-by-side type composite filament, wherein two kinds of thermoplastic polymers are arranged side by side type and a boiling water shrinkage (Sr2) measured by the method (initial load = notified denier x 1 / 10g, static load = notified denier x 20 / 10g) of clause 5.10 of JIS L 1090 is 20 to 75% of a boiling water shrinkage (Sr1) measured by the method (initial load = notified denier x 1 / 30g, static load = notified denier x 40 / 30g) of clause 7.15 of JIS L 1013. The side-by-side type composite filament. is made of two kinds of thermoplastic polymers having a number average molecular weight difference (Mn) of 5,000 to 15,000 upon spinning and the composite filament is drawn and heat-treated so as to satisfy the following physical properties: Temperature area exhibiting 95% of maximum thermal stress (Tmax, 95%): 120 to 230 DEG C Range of maximum thermal stress per denier : 0.1 to 0.4g / denier.

Description

technical field [0001] The present invention relates to a side-by-side type composite (bonding) fiber having high elasticity (shrinkage) even in a fiber state, and a method for producing the same. [0002] Specifically, the present invention relates to a side-by-side composite fiber and a method for producing the same, since the fiber has good shrinkability even in a fiber state without false-twisting treatment, and thus the false-twisting process can be omitted, Also fibers of smaller denier can be obtained. Background technique [0003] Although the use history of man-made fibers is not long, due to its repeated technical development, man-made fibers have reached the same level as natural fibers in some characteristics. However, man-made fibers are not prone to shrinkage properties and therefore cannot exhibit or be perceived as inherent to natural fibers such as wool. [0004] As prior art, the method that provides artificial fiber with shrinkage characteristic has: (i)...

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Problems solved by technology

But the shortcoming of above-mentioned method is: because crimp appearance is uneven, and because the cohesive force of core yarn and colored yarn depends on air-jet textured yarn manufacturing (air texturing) etc. physical force to release or remove, or the crimp property to decrease

[0007] In addition, the above-mentioned method for producing composite false-twisted yarns with different shrinkages has problems in that it is difficult to provide good fineness because two or more kinds of yarns must be mixed, and because two or more kinds of yarns produced in advance The yarn must be rewound and combined again, so the process becomes complicated and increases the manufacturing cost

[0008] On the other hand, the method used to mix polyurethane fibers and other man-made fibers in the manufacture of woven and knitted fabrics has the disadvantage of being difficult to handle due to the physical and chemical properties of man-made fibers being different from polyurethane fibers

[0009] Therefore, if the polyester fibers and polyurethane fibers are mixed in the manufacture of woven or knitted fabrics, many problems occur in this method, for example, it must use chlorobenzene or methylnaphthalene carriers for dyeing, and the final product is not suitable for Chlorine bleach is weak and easily hydrolyzed by sodium hydroxide

[0010] Meanwhile, synthetic fibers produced by polybutylene terephthalate (PBT) resin have a problem in that they must be subjected to a false twisting process in order to increase elasticity due to lack of shrinkage in the fiber state.

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