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Drawn composite fibers, non-woven cloth, and production method for drawn composite fibers

A composite fiber and fiber technology, applied in the direction of stretch spinning, conjugated synthetic polymer artificial filament, fiber treatment, etc., can solve the problems of reduced processability of non-woven fabrics, deterioration of appearance of non-woven fabrics, etc. The effect of wire strength

Inactive Publication Date: 2021-10-29
UBE NITTO KASEI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a method of increasing the monofilament strength and elastic modulus of the stretched composite fiber, an increase in the draw ratio is generally mentioned. However, when the draw ratio is increased, there may be a problem that the yarn breakage occurs during stretching, and the fibers after stretching may be damaged. Problems such as decrease in processability of nonwoven fabric due to increase in heat shrinkage rate and deterioration of appearance of processed nonwoven fabric

Method used

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  • Drawn composite fibers, non-woven cloth, and production method for drawn composite fibers
  • Drawn composite fibers, non-woven cloth, and production method for drawn composite fibers
  • Drawn composite fibers, non-woven cloth, and production method for drawn composite fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] use image 3 The shown apparatus continuously performs the spinning process and the drawing process to produce a drawn conjugate fiber having a sheath-core structure.

[0079] (1) Spinning process

[0080] Using the core material A and the sheath material a, an undrawn fiber having a sheath-core structure with a fineness of 1.88 dtex was produced by melt spinning. At this time, a sheath-core type composite spinneret was used so that the sheath-core ratio (sheath material / core material) was 35 / 65. In addition, regarding spinning conditions, the extruder cylinder temperature was 255° C., the spinneret temperature was 270° C., and the spinning speed was 180 m / min.

[0081] (2) stretching process

[0082] The stretching step is carried out continuously from the aforementioned spinning step. Specifically, the undrawn fiber 10 obtained in the spinning process is introduced to the introduction roll 12 with a speed of 180 m / min, the speed of the drawn fiber delivery roll 14...

Embodiment 2

[0085] In addition to using core material B instead of core material A, and setting the sheath-core ratio (sheath material / core material) to 25 / 75, melt spinning with the same method and conditions as in Example 1 had a fineness of 1.72 dTex The undrawn fiber was drawn by the same method and conditions as in Example 1.

[0086] As a result, the speed of the drawn fiber take-out roll 14 that does not cause thread breakage in the spinning step and the drawing step and can be stably drawn industrially was 841 m / min, and the draw ratio was 4.67 times. In addition, the fineness of the drawn conjugate fiber of Example 2 produced under this condition was 0.4 dtex.

Embodiment 3

[0088] The sheath-core ratio (sheath material / core material) is set to 50 / 50, except that, with the same method and conditions as in Example 1, the undrawn fiber with a fineness of 1.60 dtex is melt-spun to obtain the same method as in Example 1. The same method / conditions are used to draw the undrawn fiber.

[0089] As a result, the speed of the drawn fiber take-out roll 14 that does not cause thread breakage in the spinning process and the drawing process and can be stably drawn industrially was 781 m / min, and the draw ratio was 4.34 times. In addition, the fineness of the drawn conjugate fiber of Example 3 produced under this condition was 0.4 dtex.

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Abstract

Provided are: drawn composite fibers that have a fineness of no more than 0.6 dtex, low thermal shrinkage, and high single-fiber strength; a non-woven cloth; and a production method for drawn composite fibers.The present invention involves: melt spinning undrawn fibers that have a core-and-sheath structure that is formed from a core material that is a resin that includes a crystalline propylene polymer as a principal component and has a melt flow rate of 10-30 g / 10 min at 230 DEG C under a load of 21.18 N and a sheath material that is a resin that has a lower melting point than the core material and includes an olefin polymer as a principal component; and drawing the undrawn fibers to produce drawn composite fibers that have a fineness of no more than 0.6 dtex, a sheath material / core material cross-sectional area ratio of 50 / 50-10 / 90, and a single-fiber elastic modulus of at least 70 cN / dtex.

Description

technical field [0001] The invention relates to a stretched composite fiber with a sheath-core structure, a non-woven fabric and a method for manufacturing the stretched composite fiber. In more detail, it is related with the stretched composite fiber of fineness which is 0.6 dtex or less, its manufacturing method, and the nonwoven fabric using the stretched conjugated fiber of this fineness. Background technique [0002] Conjugate fibers of a sheath-core structure formed using two types of olefin-based resins with different properties are used in various fields because of their thermal adhesiveness and excellent chemical resistance. A composite fiber of such a sheath-core structure can be produced, for example, by stretching an undrawn fiber of a sheath-core structure formed by melt spinning. [0003] On the other hand, functional nonwoven fabrics used in various filter materials, battery separators, and the like are required to be thin films and have high mechanical stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/06D04H1/541D04H1/544
CPCD01F8/06D04H1/544D01D5/12D04H1/5412D04H1/43828D01D5/34D01D5/098D04H1/541D01D5/082D01D5/16D10B2321/022
Inventor 日下圣士富田浩太郎
Owner UBE NITTO KASEI CO LTD