Mixed fiber spunbonded nonwoven fabric, and method for production and use thereof

Inactive Publication Date: 2012-06-28
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]The mixed fiber spunbonded nonwoven fabric of the present invention has high bulkiness, excellent initial hydrophilicity, long-lasting hydrophilicity, liquid dispersibility, liquid transpiration property, m

Problems solved by technology

The heat treatment method for providing a nonwoven fabric with bulkiness, however, has a complicated process.
Furthermore, the heat treatment does not thin fibers forming the nonwoven fabric, and possibly involve heat shrinkage increasing the diameter of fibers; anyhow, the heat treatment may lead to reduced softness and touch.
Further, the nonwoven fabric obtainable by mixing the hydrophilic fib

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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  • Mixed fiber spunbonded nonwoven fabric, and method for production and use thereof
  • Mixed fiber spunbonded nonwoven fabric, and method for production and use thereof
  • Mixed fiber spunbonded nonwoven fabric, and method for production and use thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0150]Into 60% by weight of an ethylene oxide adduct of eicosanol [CH3(CH2)19—O—(CH2CH2O)2.5—H] and 40% by weight of a propylene homopolymer having a MFR of 30 g / 10 min, 0.05 part by weight of antioxidant (manufactured by Ciba, product name: Irgafos 168) was added. The mixture was melt-kneaded at 230° C., and extruded, thereby preparing a pelletized masterbatch (hydrophilizing agent AE-1).

[0151]96% by weight of a propylene homopolymer having a MFR, as determined in accordance with ASTM D 1238, at 230° C. under a load of 2.16 Kg, of 60 g / 10 min, a density of 0.91 g / cm3, a melting point of 160° C. (hereinafter referred to “PP-1”) was mixed with 4% by weight of a high density polyethylene having a MFR, as determined in accordance with ASTM D 1238, at 190° C. under a load of 2.16 Kg, of 5 g / 10 min, a density of 0.97 g / cm3, a melting point of 134° C. (hereinafter referred to “HDPE”). Thereafter, with 100 parts by weight of the PP-1 / HDPE composition, 5 parts by weight (3 parts by weight i...

example 2

[0158]A mixed fiber spunbonded nonwoven fabric was prepared by the same manner as in Example 1, except that the conditions of the press processing performed in Example 1 were changed such that the heating temperature was 105° C. and the linear pressure was 30 N / cm, and the mixed fiber spunbonded nonwoven fabric was evaluated by the method as described above. The evaluation result is shown in Table 1. The touch (11) was evaluated as “I”. When this mixed fiber spunbonded nonwoven fabric was stretched in CD, good stretchability was obtained.

example 3

[0159]A mixed fiber spunbonded nonwoven fabric was prepared by the same manner as in Example 2, except that in the stretch processing performed in Example 2, the depth of the meshing of the rolls was adjusted to be 2.5 mm. The stretching ratio in CD obtained under the above conditions was 220% (a ratio of 2.2). This mixed fiber spunbonded nonwoven fabric was evaluated by the method as described above. The evaluation result is shown in Table 1. The touch (11) was evaluated as “I”. When this mixed fiber spunbonded nonwoven fabric was stretched in CD, good stretchability was obtained.

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Abstract

A mixed fiber spunbonded nonwoven fabric which comprises 90 to 10% by weight of a long fiber of thermoplastic resin (A) that has been hydrophilization-treated and 10 to 90% by weight of a long fiber of thermoplastic elastomer (B) and which has a strength ratio [the ratio of a strength at 20% of an elongation at a maximum strength (elongation at a maximum point) to the maximum strength] in at least one direction of not more than 40% and a bulk density of 0.10 to 0.40 g/cm3. The fabric can exhibit excellent initial hydrophilicity, long-lasting hydrophilicity, liquid dispersibility, liquid transpiration property, moisture permeability, breathability, softness, resistance to fluff, stretchability and touch, and low stickiness, and is suitable for sheets constituting absorbent articles such as sanitary napkins, panty liners, incontinence pads, and disposable diapers. A production method is also provided.

Description

TECHNICAL FIELD[0001]The present invention relates to a mixed fiber spunbonded nonwoven fabric which has high bulkiness, excellent initial hydrophilicity, long-lasting hydrophilicity, liquid dispersibility, liquid transpiration property, moisture permeability, breathability, softness, resistance to fluff, stretchability and touch, and low stickiness, and which is suitable for sheets constituting absorbent articles such as sanitary napkins, panty liners, incontinence pads, and disposable diapers, the examples of such sheets including a surface sheet, a second sheet, a sheet for lapping an absorber (core lap), and a back sheet.TECHNICAL BACKGROUND[0002]Since nonwoven fabrics have excellent breathability and softness, they have been widely used for surface sheets and back sheets of absorbent articles such as disposable diapers and sanitary napkins, which are required to have absorbing properties for quickly transferring liquids excreted or discharged such as blood and urine to absorber...

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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IPC IPC(8): D04H13/00D04H3/14D04H3/153D04H3/16
CPCA61F13/51104A61F13/51121A61F13/513A61F13/51401A61F13/51466D04H3/009D01D5/082D01D5/0985D04H3/153D04H3/16D04H3/007A61F13/51476Y10T442/681D02G3/045
Inventor KUNIMOTO, NAOSUKE
Owner MITSUI CHEM INC
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