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Non-woven fabrics of wind-shrink fiber and laminate thereof

a technology of wind-shrink fiber and non-woven fabrics, which is applied in the directions of weaving, filament/thread forming, transportation and packaging, etc., can solve problems such as unstable spinnability

Inactive Publication Date: 2004-04-08
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These nonwoven fabrics proposed above are prepared by conjugate melt spinning of polymers having different MFR values, i.e., different melt viscosities, but unfortunately these fabrics involve a problem of unstable spinnability since filaments discharged through a spinning nozzle tend to slant.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Non-woven fabrics of wind-shrink fiber and laminate thereof
  • Non-woven fabrics of wind-shrink fiber and laminate thereof
  • Non-woven fabrics of wind-shrink fiber and laminate thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0096] Using a propylene homopolymer having the melting point of 162.degree. C. and MFR of 60 g / 10 min (as measured at a temperature of 230.degree. C. under a load of 2.16 kg in accordance with ASTM D1238; hereinafter the same unless otherwise indicated) as the first propylene-based polymer and as the second propylene-based polymer a propylene-ethylene random copolymer having the melting point of 142.degree. C., MFR of 60 g / 10 min and the ethylene unit content of 4.0 mol %, conjugate melt-spinning was carried out by a spun-bonding process to deposit an eccentric core-sheath type conjugate fiber having the core made from the propylene homopolymer and the sheath made from the propylene-ethylene random copolymer (the ratio of the core to the sheath was 20 / 80 by weight) on the collection surface. The conjugate fiber was then subjected to emboss processing at an emboss temperature of 110.degree. C. with an emboss pattern (emboss area percentage: 18.2%, non-emboss unit area: 0.74mm.sup.2)...

example 2

[0097] A nonwoven fabric composed of crimped conjugate fibers having the basis weight of 25 g / m.sup.2 and the fineness of the constituent fiber of 2.4 deniers was produced in a manner similar to EXAMPLE 1, except that a propylene-ethylene random copolymer having the melting point of 138.degree. C., MFR of 60 g / 10 min and the ethylene unit content of 5.0 mol % was used as the second propylene-based polymer and the emboss temperature was changed to 100.degree. C. The details of the propylene-based polymer components are shown in TABLE 1 and the measurement / evaluation results on the nonwoven fabric obtained are shown in TABLE 2.

[0098] The melting point peaks of the thus obtained conjugate fibers by DSC in the first run were observed at 141.5.degree. C., 156.2.degree. C. and 164.8.degree. C., and the peak area percentages were 80%, 10% and 10%, respectively. The measurement curve by DSC is shown in FIG. 4.

example 3

[0099] A nonwoven fabric composed of crimped conjugate fibers having the basis weight of 25 g / m.sup.2 and the fineness of the constituent fiber of 2.4 deniers was produced in a manner similar to EXAMPLE 2, except that the eccentric core-sheath type conjugate fiber had the core / sheath=30 / 70 (by weight ratio). The details of the propylene-based polymer components are shown in TABLE 1 and the measurement / evaluation results on the nonwoven fabric obtained are shown in TABLE 2.

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Abstract

The invention provides a nonwoven fabric of crimped conjugate fibers comprising (1) a first propylene-based polymer component and (2) a second propylene-based polymer component, and a laminate of the nonwoven fabric and other nonwoven fabrics or porous films, in which the melting point of the component (1) is higher by at least 20° C. than that of the component (2) a ratio of the two components in melt flow rate (component (2) / component (1)) is in the range of 0.8 to 1.2, and the component ratio expressed by (1) / (2) (by weight) is 50 / 50 to 5 / 95. The nonwoven fabric has an excellent bulkiness and softness, is excellent in terms of spinnability and fuzzing resistance, and can be spun by a conventional melt spinning. The laminate has further improved water impermeability and surface smoothness. The nonwoven fabric and the laminate using the same may both be used for disposable diapers or sanitary napkins.

Description

[0001] The present invention relates to a nonwoven fabric comprising crimped conjugate fibers. More particularly, the invention relates to a nonwoven fabric composed of crimped conjugate fibers, which has excellent bulkiness and softness as well as excellent spinnability and fuzzing resistance, and to a nonwoven fabric laminate using the same.TECHNICAL BACKGROUND[0002] In recent years, nonwoven fabrics are used for a wide variety of applications because of their excellent gas permeability and softness and are finding an increasing number of applicable fields. Reflecting this background, nonwoven fabrics are being called on to have a variety of properties satisfying the requirements depending upon respective applications and to have improved properties.[0003] For example, nonwoven fabrics used as substrates of sanitary goods such as disposable diapers, sanitary napkins, or poultice materials, etc. are required to have water impermeability and possess excellent permeability. In additi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B5/26D01D5/34D01F8/06D04H1/4391D04H1/541D04H1/544D04H3/007D04H13/00
CPCB32B5/26D01F8/06D04H3/018D04H3/14D04H13/007Y10T428/2924Y10T428/2929Y10T428/2922Y10T428/2931Y10T428/2915Y10T428/2913D04H3/007Y10T442/627Y10T442/608Y10T442/60Y10T442/637Y10T442/641Y10T442/629D04H1/541D04H1/4391D01D5/34D04H13/00
Inventor KISHINE, MASAHIROTAKESUE, KUNIHIKOMORIMOTO, HISASHI
Owner MITSUI CHEM INC
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