Nonwoven fabric, process for producing the same, sanitary material and sanitary supply

a non-woven fabric and non-woven technology, applied in the field of non-woven fabrics, can solve the problems of poor softness and hand discomfort, and the fabric based thereon will not always have a sufficient hand and touch feel to be effective applied in the production of sanitary articles such as disposable diapers, sanitary napkins, incontinence pads, etc., to achieve the effect of high mechanical strength and high thermal resistance of propylene-based homopolymers

Inactive Publication Date: 2003-08-21
IDEMITSU UNITECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is made of a resin having a high crystallizing activity, it will be excellent in spin easiness, but poor in softness and problematic in hand.
If a polypropylene-based resin of which the isotactic pentad fraction (which serves as an index representing the crystallizing activity of the resin) is about 90 mol %, or a resin most often used as a material of non-woven fabric, is employed, the fiber will be comparatively good in spin easiness but the fabric based thereon will not always have a sufficient hand and touch feel to be effectively applied for the production of sanitary articles such as disposable diapers, sanitary napkins, incontinence pads, etc.
In the material of this fabric, however, the features characteristic with a propylene-based homopolymer such as high thermal resistance, high mechanical strength, etc are absent, and a comparatively large amount of a hydrocarbon compound with a low molecular weight and low melting point must be added to the propylene-based random copolymer.
The coexistence of such a hydrocarbon lubricant may prove to be problematic: the heat seal and adhesiveness of the non-woven fabric will be degraded as a result of t

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 2

[0082] Non-woven fabric samples were obtained by the same method as used in Example 1, except that the content of erucamide was made constant, the aging temperature was kept constant and the aging time was varied. The non-woven fabric samples were evaluated for their mass per unit area, spin easiness, and other involved characteristics. The results are shown in Table 2.

[0083] From Table 2 it is apparent that the fabric samples (2), (3) and (4), particularly samples (3) and (4) present with static friction coefficients which fall within the range specified for the non-woven fabric of this invention, and thus they are more suitable as a sanitary material for disposable diapers, as compared with the fabric sample (1).

2 TABLE 2 Example 2 (1) (2) (3) (4) Addition amount of 0.3 0.3 0.3 0.3 erucamide (weight part) Mass per unit area (g / m.sup.2) 20 20 20 20 Spin easiness .circleincircle. .circleincircle. .circleincircle. .circleincircle. Aging temperature (.degree. C.) 40 40 40 40 Aging tim...

example 3

[0084] Non-woven fabric samples were obtained by the same method as used in Example 1, except that the content of erucamide was made constant, the aging time was kept constant and the aging temperature was varied. The non-woven fabric samples were evaluated for their mass per unit area, spin easiness, and other involved characteristics. The results are shown in Table 3.

[0085] From Table 3 it is apparent that the fabric samples (3), (4), and (5) present with static friction coefficients which fall within the range specified for the non-woven fabric of this invention, and thus they are more suitable as a sanitary material for diapers, as compared with the fabric samples (1) and (2). It is observed by inspecting the results of the sample (5) that the fabric sample exposed to a higher temperature during aging tends to develop a higher static friction coefficient.

3 TABLE 3 Example 3 (1) (2) (3) (4) (5) Addition amount of 0.3 0.3 0.3 0.3 0.3 erucamide (weight part) Mass per unit area (g / m...

example 4

[0086] In stead of the device for producing spunbonded non-woven fabric used in Example 1, a multi-stage device was employed, and erucamide containing polypropylene used in Example 1 and erucamide-free polypropylene were introduced as materials to produce non-woven fabric having a two layered structure each layer having an mass per unit area of 10 g / m.sup.2, or the density different from those of Examples 1 to 3. The non-woven fabric was submitted to aging, which consisted of keeping the fabric at 40.degree. C. for 24 hours. A number of non-woven fabric samples were obtained, and they were evaluated for their mass per unit area, spin easiness and other involved characteristics. The results are shown in Table 4.

[0087] From Table 4 it is apparent that the layered non-woven fabric also presents with excellent characteristics.

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Abstract

Polyolefin resin-based non-woven fabric characterized by containing a fatty acid amide compound, and by having a static friction coefficient of 0.1 to 0.4. Production of such non-woven fabric is achieved by subjecting, for example, non-woven fabric containing 0.05 to 1 wt. % erucamide to an aging treatment at 30 to 60° C. for 5 to 50 hours.

Description

[0001] The present invention relates to polyolefin resin-based non-woven fabric and a method for the production thereof, particularly to fabric suitable as a material of sanitary articles such as disposable diapers because of its excellent hand and touch feeling.DESCRIPTION OF THE RELATED ART[0002] The filament non-woven fabric such as spunbonded non-woven fabric has been widely used in many applications because it has excellent mechanical properties such as high tensile strength and air permeability, as well as ensures the efficient production of fabric based on continuously spun fibers. The thermoplastic resin which has been mainly used as a material of such filament non-woven fabric includes polyamide resins and polyester resins because they give excellent fiber characteristics, and are easily melt into a fiber easily yielding to spinning (spinning easiness). However, currently, an increasingly larger amount of polyolefin resins such as polypropylene, polyethylene, etc., or the r...

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): D04H1/4291A61F5/44A61F13/15A61L15/22C08K5/20C08L23/00C08L23/02C08L23/10C08L23/12D01F1/10D01F6/46D01F8/06D04H3/007D04H3/02D04H3/16D04H13/00
CPCA61F13/51C08K5/20C08L23/00C08L23/02C08L23/10C08L23/12D04H13/007D01F1/10D04H3/16D04H1/4291D04H3/007Y10T442/614Y10T442/66Y10T442/681D04H3/02
Inventor ISHIKAWA, MASAHIDE
Owner IDEMITSU UNITECH CO LTD
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