Fibrous nonwoven fabric

a non-woven fabric and fiber technology, applied in the direction of weaving, filament/thread forming, melt spinning methods, etc., can solve the problems of defective nonwoven fabric quality and inability to achieve stable spinnability, and achieve the effect of reducing the diameter of fibers and preserving spinning stability

Inactive Publication Date: 2015-12-24
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention describes a way to make a fibrous nonwoven fabric using a special polyolefin resin that can reduce the size of the fibers without affecting the spinning process. This helps to create a more uniform and high-quality fabric.

Problems solved by technology

However, in producing a nonwoven fabric using a conventionally used polyolefin-based resin by a spunbond method, for the purpose of aiming to reduce fiber diameter, if a discharge amount per hole is decreased, or a spinning speed is increased, end breakage occurs frequently, so that stable spinnability is not obtained.
When the end breakage occurs, the broken fiber catches up surrounding fibers to cause a roping phenomenon, or the nonwoven fabric in a part where the end breakage occurs or a part where the roped fiber falls leads to a defect or uneven basis weight, and therefore, defective quality of the nonwoven fabric is brought.

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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Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Resin Composition

[0067]To a resin mixture composed of 10 parts by mass of a low-crystalline polypropylene (“L-MODU (a registered trademark) S901”, manufactured by Idemitsu Kosan Co., Ltd., MFR: 50 g / 10 min, melting point: 70° C.) and 90 parts by mass of a high-crystalline polypropylene A (“NOVATEC SA-03”, manufactured by Japan Polypropylene Corporation, MFR: 30 g / 10 min, melting point: 160° C.), erucic acid amide was added in an amount of 2,000 ppm on the basis of the resin mixture, thereby preparing a resin composition.

[0068]Physical properties of the low-crystalline polypropylene and the high-crystalline polypropylene A as described above were measured by the following measuring methods. Results are shown in Table 1.

[Initial Elastic Modulus]

[0069]The polypropylene was subjected to press molding to fabricate a test piece, the initial elastic modulus of which was then measured by a tensile test in conformity with JIS K-7113.[0070]Thickness of test piece (No. 2 dumbbel...

example 2

[0111]A nonwoven fabric was molded and evaluated in the same manners as those in Example 1, except that in Example 1, the discharge amount per hole was changed to 0.2 g / min, the ejector pressure was changed to 4.0 kg / cm2, and the line speed was changed to 24 m / min. Results are shown in Table 2. At that time, [T] / [E] obtained from a relation between the discharge amount per hole and the ejector pressure was 0.05.

example 3

[0112]A nonwoven fabric was molded and evaluated in the same manners as those in Example 1, except that in Example 1, the discharge amount per hole was changed to 0.3 g / min, the ejector pressure was changed to 2.0 kg / cm2, and the line speed was changed to 35 m / min. Results are shown in Table 2. At that time, [T] / [E] obtained from a relation between the discharge amount per hole and the ejector pressure was 0.15.

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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PUM

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Abstract

Provided is a fibrous nonwoven fabric including a resin composition (C) containing a high-crystalline polyolefin (A) and a low-crystalline polyolefin (B), wherein a half-crystallization time (tc) of the resin composition (C) is 1.2 to 2.0 times a half-crystallization time (ta) of the high-crystalline polyolefin (A).

Description

TECHNICAL FIELD[0001]The present invention relates to a fibrous nonwoven fabric using a polyolefin material.BACKGROUND ART[0002]In recent years, polyolefin-based fibers and nonwoven fabrics are used for various applications, such as a disposable diaper, a sanitary product, a hygienic product, a clothing material, a bandage, a packaging material, etc. The fibers and nonwoven fabrics are often used for applications in which they come into direct contact with the body, and thus, in recent years, a required performance regarding good wear feeling to the body and hand touch feeling are being more increased. For this reason, with respect to the nonwoven fabrics, technological development related to an improvement of texture for good wear feeling, reduction in basis weight for weight reduction of products, and the like is demanded.[0003]However, in producing a nonwoven fabric using a conventionally used polyolefin-based resin by a spunbond method, for the purpose of aiming to reduce fiber ...

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): D04H1/4291D01D5/08
CPCD04H1/4291D01D5/08Y10T442/681D10B2509/026Y10T442/608D10B2501/00D04H3/007D04H3/016
Inventor KOORI, YOHEITAKEBE, TOMOAKIMINAMI, YUTAKA
Owner IDEMITSU KOSAN CO LTD
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