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Thermoadhesive conjugate fiber and manufacturing method of the same

A composite fiber and heat-adhesive technology, applied in the direction of conjugated synthetic polymer rayon, textiles and papermaking, can solve the problems of high elongation, low orientation, etc., achieve excellent net quality, improve productivity, Improve the effect of carding passability

Active Publication Date: 2014-08-06
TEIJIN FRONTIER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, among thermally adhesive conjugate fibers with low orientation and high elongation, fibers with excellent carding properties have not been proposed so far.

Method used

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  • Thermoadhesive conjugate fiber and manufacturing method of the same
  • Thermoadhesive conjugate fiber and manufacturing method of the same
  • Thermoadhesive conjugate fiber and manufacturing method of the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] The core component (fiber-forming resin component) used polyethylene terephthalate (PET) with IV=0.64dL / g, MFR=25g / 10min, Tg=70°C, Tm=256°C, and the sheath component (thermal Adhesive resin component) High-density polyethylene (HDPE) with MFR=20g / 10min, Tm=131°C (Tg is less than zero) was used. After these resins were melted at 290°C and 250°C, respectively, using a known nozzle for eccentric core-sheath composite fibers, an eccentric core-sheath composite fiber was formed at a weight ratio of core component: sheath component = 50:50 (% by weight). The fibers were spun under conditions of a discharge rate of 0.71 g / min / hole and a spinning speed of 1150 m / min to obtain undrawn yarns. The undrawn yarn was subjected to heat treatment to fix the length while stretching at a low ratio of 1.0 times in warm water at 90° C. which was 20° C. higher than the glass transition temperature of the resin of the core component. Next, after immersing the filaments obtained by the fixed...

Embodiment 2 and Embodiment 3

[0070] Conjugate fibers were produced under the same conditions as in Example 1 except that the weight ratio of the core component and the sheath component was changed, and conjugate fibers having a monofilament fineness of 6.7 decitex and 6.5 decitex were obtained. The results are shown in Table 1 and Table 3.

Embodiment 4

[0072] Except that the discharge rate was changed to 0.53g / min / hole, and the draw ratio during the fixed-length heat treatment was changed to 0.7 times, a composite fiber was produced under the same conditions as in Example 1, and a composite fiber with a monofilament fineness of 6.6 dtex was obtained. fiber. The results are shown in Table 1 and Table 3.

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Abstract

A major object of the invention is to provide a thermoadhesive conjugate fiber with low heat shrinkability and high adhesion having low orientation and high elongation and having extremely satisfactory card-passing properties. The object of the invention can be achieved by a thermoadhesive conjugate fiber made of a fiber forming resin component and a crystalline thermoplastic resin having a melting point of at least 20 DEG C lower than that of the fiber forming resin component and having a breaking elongation of from 60 to 600 %, a dry heat shrinkage percentage at 120 DEG C of from -10.0 to 5.0 %, and more preferably a percentage of crimp / number of crimps of 0.8 or more; and a manufacturing method of a thermoadhesive conjugate fiber, which includes drawing an undrawn yarn of a conjugate fiber taken up at a spinning rate of from 150 to 1, 800 m / min in a low draw ratio of from 0.5 to 1.3 times at a temperature higher than both a glass transition temperature of a major crystalline thermoplastic resin of the thermoadhesive resin component and a glass transition temperature of the fiber forming resin component and simultaneously subjecting to a fixed-length heat treatment and subsequently subjecting to a heat treatment under no tension at a temperature of at least 5 DEG C higher than the temperature of the fixed-length heat treatment.

Description

technical field [0001] The present invention relates to a heat-adhesive conjugate fiber having high adhesive strength after heat-bonding and extremely little heat shrinkage during heat-bonding, and a method for producing the same. More specifically, the present invention relates to a heat-adhesive conjugate fiber having high adhesiveness and low thermal shrinkage, which has excellent crimping properties and excellent carding passability despite low orientation and high elongation, and a method for producing the same. Background technique [0002] In general, heat-adhesive composite fibers represented by a core-sheath type heat-adhesive composite fiber having a heat-adhesive resin component as a sheath and a fiber-forming resin component as a core are processed by carding, air-laying, and wet papermaking. After the fiber web is formed by the method, etc., the heat-adhesive resin component is melted to form bonds between the fibers and used. That is, since no binder containin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/04D02J1/22
Inventor 合田裕宪
Owner TEIJIN FRONTIER CO LTD