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Heat-bondable composite fiber and process for producing the same

A composite fiber, thermal adhesive technology, applied in the direction of conjugated synthetic polymer rayon, fiber processing, textiles and papermaking, etc. The effect of combined strength

Inactive Publication Date: 2009-05-27
TEJIN FIBERS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, due to the deterioration of the polymer constituting the shell component and the large spinning draft, there is a problem that yarn breakage is very likely to occur during spinning.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] For the core component (fiber-forming resin component), polyethylene terephthalate (PET) with IV=0.64dL / g, Tg=70°C, and Tm=256°C was used, and for the shell component (thermal adhesive resin Component) used high-density polyethylene (HDPE) with MFR = 20 g / 10 minutes and Tm = 131° C. (Tg less than zero). These resins were melted at 290°C and 250°C, respectively, and composite fibers were formed using a known core-shell type composite fiber spinneret so that the weight ratio of the core component and the shell component was 50wt%:50wt% The weight ratio was spun under the conditions that the discharge amount was 0.70 g / min / hole and the spinning speed was 1150 m / min to obtain undrawn yarns. After cold stretching the unstretched yarn by 1.20 times, soak the cold stretched yarn in an aqueous solution of oil containing lauryl phosphate potassium salt and polyoxyethylene modified polysiloxane (80wt%:20wt%) For the yarn, a mechanical crimp of 11 pieces / 25 mm was given to the ya...

Embodiment 2

[0062] Conjugated fibers were produced under the same conditions as in Example 1 except that the draw ratio of cold drawing was 1.1 times. The monofilament fineness of the obtained heat-adhesive composite fiber is 6.41 dtex, the strength is 0.65 cN / dtex, the elongation is 424.1%, the 100% elongation stress is 0.41 cN / dtex, and the dry heat shrinkage at 120°C is -1.9% . The web area shrinkage rate of the web comprising 100% of the heat-adhesive conjugate fiber was -5.6%, the nonwoven fabric strength was 16.5 kg / g, and the cantilever value was 8.10 cm.

Embodiment 3

[0064] Conjugate fibers were produced under the same conditions as in Example 1 except that the draw ratio of cold drawing was 1.30 times. The monofilament fineness of the obtained thermobonding composite fiber is 6.22dtex, the strength is 0.72cN / dtex, the elongation is 381.8%, the 100% elongation stress is 0.46cN / dtex, and the dry heat shrinkage at 120°C is -2.0%. . The web area shrinkage rate of the web comprising 100% of the heat-adhesive conjugate fiber was -6.1%, the nonwoven fabric strength was 17.1 kg / g, and the cantilever value was 8.90 cm.

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Abstract

Self-expandable heat-bondable composite fibers which are made from polyethylene terephthalate as a fiber-forming resin ingredient and have a low modulus. The self-expandable heat-bondable composite fibers are made from a fiber-forming resin ingredient and a heat-bondable resin ingredient, and are characterized in that the fiber-forming resin ingredient comprises polyethylene terephthalate, the heat-bondable resin ingredient comprises a crystalline thermoplastic resin having a melting point lower by at least 20 DEG C than that of the fiber-forming resin ingredient, and the fibers have an elongation at break of 130-600%, a tensile strength at 100%elongation of 0.3-1.0 cN / dtex, and a degree of shrinkage in 120 DEG C dry heating lower than -1.0%.

Description

technical field [0001] The present invention relates to a self-extensible thermally-adhesive conjugate fiber having a low modulus, self-extensible when thermally bonded, and soft to the touch as a thermally-bonded nonwoven fabric, and a method for producing the same. Background technique [0002] In general, heat-adhesive conjugate fibers represented by core-shell type heat-adhesive conjugate fibers having a heat-adhesive resin component as the shell and a fiber-forming resin component as the core are processed by the carding machine method, air flow method, After forming a fiber web by wet papermaking method, etc., the thermally adhesive resin component is melted by hot air drying treatment or hot roll treatment to form bonds between fibers and used as a nonwoven fabric. That is, since the binder using an organic solvent as a solvent is not used, the discharge amount of harmful substances including an organic solvent is small as an advantage. In addition, it has such great...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/14D02J1/22D04H1/54D04H1/541
CPCD02J1/22D01F8/14D04H1/54Y10T428/2929Y10T442/641D01D5/34D04H1/541
Inventor 合田裕宪
Owner TEJIN FIBERS LTD