JP7411950B2 - Surface material for sanitary materials and its manufacturing method - Google Patents
Surface material for sanitary materials and its manufacturing method Download PDFInfo
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- JP7411950B2 JP7411950B2 JP2019163342A JP2019163342A JP7411950B2 JP 7411950 B2 JP7411950 B2 JP 7411950B2 JP 2019163342 A JP2019163342 A JP 2019163342A JP 2019163342 A JP2019163342 A JP 2019163342A JP 7411950 B2 JP7411950 B2 JP 7411950B2
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- 239000000463 material Substances 0.000 title claims description 65
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000000835 fiber Substances 0.000 claims description 181
- 239000004745 nonwoven fabric Substances 0.000 claims description 80
- -1 polypropylene Polymers 0.000 claims description 47
- 229920000742 Cotton Polymers 0.000 claims description 42
- 239000003795 chemical substances by application Substances 0.000 claims description 30
- 239000000470 constituent Substances 0.000 claims description 28
- 239000004743 Polypropylene Substances 0.000 claims description 18
- 229920001155 polypropylene Polymers 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 12
- 229920005606 polypropylene copolymer Polymers 0.000 claims description 12
- 239000004711 α-olefin Substances 0.000 claims description 9
- 229920001577 copolymer Polymers 0.000 claims description 8
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 8
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 6
- 150000005215 alkyl ethers Chemical class 0.000 claims description 6
- 150000002148 esters Chemical class 0.000 claims description 6
- 235000011187 glycerol Nutrition 0.000 claims description 6
- 229920005604 random copolymer Polymers 0.000 claims description 5
- 238000005304 joining Methods 0.000 claims description 4
- 229920000297 Rayon Polymers 0.000 claims description 3
- 239000002964 rayon Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000000034 method Methods 0.000 description 21
- 239000007788 liquid Substances 0.000 description 11
- 238000002844 melting Methods 0.000 description 8
- 230000008018 melting Effects 0.000 description 8
- 239000010839 body fluid Substances 0.000 description 6
- 210000001124 body fluid Anatomy 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000004049 embossing Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229920005992 thermoplastic resin Polymers 0.000 description 4
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 235000019198 oils Nutrition 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 2
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 description 2
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 2
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- 239000004594 Masterbatch (MB) Substances 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 230000007794 irritation Effects 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000002736 nonionic surfactant Substances 0.000 description 2
- 125000005702 oxyalkylene group Chemical group 0.000 description 2
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 2
- 229920001384 propylene homopolymer Polymers 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 150000005846 sugar alcohols Polymers 0.000 description 2
- HBXWUCXDUUJDRB-UHFFFAOYSA-N 1-octadecoxyoctadecane Chemical compound CCCCCCCCCCCCCCCCCCOCCCCCCCCCCCCCCCCCC HBXWUCXDUUJDRB-UHFFFAOYSA-N 0.000 description 1
- RZRNAYUHWVFMIP-KTKRTIGZSA-N 1-oleoylglycerol Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OCC(O)CO RZRNAYUHWVFMIP-KTKRTIGZSA-N 0.000 description 1
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 206010040880 Skin irritation Diseases 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 235000012343 cottonseed oil Nutrition 0.000 description 1
- 239000002385 cottonseed oil Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000010041 electrostatic spinning Methods 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 1
- 235000014593 oils and fats Nutrition 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 125000006353 oxyethylene group Chemical group 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 230000036556 skin irritation Effects 0.000 description 1
- 231100000475 skin irritation Toxicity 0.000 description 1
- 239000012748 slip agent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Absorbent Articles And Supports Therefor (AREA)
Description
本発明は、生理用ナプキンや使い捨ておむつ等の衛生材料の表面に用いる表面材に関し、特に、肌触りがよくスポット吸液性に優れた衛生材料の表面材に関するものである。 The present invention relates to a surface material used for sanitary materials such as sanitary napkins and disposable diapers, and particularly to a surface material for sanitary materials that is soft to the touch and has excellent spot liquid absorption.
従来より、衛生材料の表面材として、短繊維不織布又は長繊維不織布が採用されている。短繊維不織布は、肌触りの点で優れているが破断強度が低いという欠点があった。一方、長繊維不織布は、高破断強度であるが肌触りが悪いという欠点があった。このため、特許文献１には、長繊維不織布と特定の短繊維不織布とを接合した衛生材料の表面材が開示されている。そして、肌側に配置される特定の短繊維不織布として、高融点と低融点の少なくとも２種の熱可塑性樹脂成分を有する熱融着性複合短繊維相互間を低融点成分で融着したものが採用されている（特許文献１、請求項１）。また、長繊維不織布としても、高融点と低融点の少なくとも２種の熱可塑性樹脂成分を有する熱融着性複合長繊維相互間を低融点成分で融着したものが採用されている（特許文献１、請求項３）。 Conventionally, short fiber nonwoven fabrics or long fiber nonwoven fabrics have been employed as surface materials for sanitary materials. Short fiber nonwoven fabrics are excellent in feel, but have the disadvantage of low breaking strength. On the other hand, long-fiber nonwoven fabrics have a high breaking strength but have a drawback of being uncomfortable to the touch. For this reason, Patent Document 1 discloses a surface material for sanitary materials in which a long fiber nonwoven fabric and a specific short fiber nonwoven fabric are bonded together. The specific short fiber nonwoven fabric to be placed on the skin side is one in which heat-fusible composite short fibers containing at least two types of thermoplastic resin components, one with a high melting point and one with a low melting point, are fused together with a low melting point component. (Patent Document 1, Claim 1). Moreover, as a long fiber nonwoven fabric, one in which heat-fusible composite long fibers containing at least two types of thermoplastic resin components, high melting point and low melting point, are fused together with a low melting point component has been adopted (Patent Document 1, Claim 3).
しかしながら、熱可塑性樹脂成分よりなる短繊維で構成される短繊維不織布は、木綿や絹等の天然繊維で構成される短繊維不織布に比べると、肌触りが悪く、しかも肌がかぶれる恐れもあった。さらに、長繊維不織布も熱可塑性樹脂成分よりなる長繊維で構成されているため、吸液されにくく、体液が肌に沿って拡散しやすいということもあった。 However, short fiber nonwoven fabrics made of short fibers made of thermoplastic resin components have a poor feel to the touch compared to short fiber nonwoven fabrics made of natural fibers such as cotton and silk, and there is also a risk of skin irritation. Furthermore, since the long-fiber nonwoven fabric is also composed of long fibers made of a thermoplastic resin component, it is difficult to absorb liquid, and body fluids tend to spread along the skin.
本発明の課題は、肌触りがよく肌がかぶれにくく、しかも体液のスポット吸液性に優れた衛生材料の表面材を提供することにある。 An object of the present invention is to provide a surface material for a sanitary material that is comfortable to the touch, does not cause irritation to the skin, and has excellent spot absorption of body fluids.
本発明は、以下の手段に関する。
＜１＞
未脱脂綿を構成繊維とする短繊維不織布と、ポリプロピレン系共重合体及び親水剤を含むポリプロピレン系長繊維を構成繊維とする長繊維不織布とが接合されてなり、該親水剤は該ポリプロピレン系長繊維本体に内包されており、
前記接合は、短繊維不織布の構成繊維と長繊維不織布の構成繊維相互間が絡合することにより達成されており、
前記短繊維不織布は、肌側に配置されることを特徴とする衛生材料の表面材。
＜２＞
未脱脂綿が未脱脂漂白綿である＜１＞に記載の衛生材料の表面材。
＜３＞
未脱脂綿に、脱脂綿、漂白綿、絹繊維及びレーヨン繊維よりなる群から選ばれた少なくとも一種の他種繊維が混綿されてなる＜１＞に記載の衛生材料の表面材。
＜４＞
ポリプロピレン系共重合体がプロピレン・α－オレフィンランダム共重合体を含む＜１＞に記載の衛生材料の表面材。
＜５＞
親水剤が、ポリオキシアルキレンアルキルエーテル、ポリオキシアルキレンアルキルアミド及びグリセリンモノ脂肪酸エステルよりなる群から選ばれた少なくとも一種の化合物である＜１＞に記載の衛生材料の表面材。
＜６＞
短繊維不織布の構成繊維相互間は、水流絡合により結合している＜１＞に記載の衛生材料の表面材。
＜７＞
長繊維不織布の構成繊維相互間は、部分的に施された熱圧着部位で結合している＜１＞に記載の衛生材料の表面材。
＜８＞
未脱脂綿が集積されてなるシート状繊維ウェブと、ポリプロピレン系共重合体に親水剤が練り込まれているポリプロピレン系長繊維を構成繊維とする長繊維不織布とを積層した積層体に、高圧水流を施すことにより、未脱脂綿相互間を絡合せしめると共に、未脱脂綿とポリプロピレン系長繊維を絡合せしめることを特徴とする＜１＞に記載の衛生材料の表面材の製造方法。
The present invention relates to the following means.
<1>
A short fiber nonwoven fabric whose constituent fibers are non-absorbent cotton and a long fiber nonwoven fabric whose constituent fibers are polypropylene long fibers containing a polypropylene copolymer and a hydrophilic agent are joined together, and the hydrophilic agent is the polypropylene long fibers. It is included in the main body,
The joining is achieved by entanglement between the constituent fibers of the short fiber nonwoven fabric and the constituent fibers of the long fiber nonwoven fabric,
A surface material for sanitary materials, characterized in that the short fiber nonwoven fabric is placed on the skin side.
<2>
The surface material for sanitary materials according to <1>, wherein the unabsorbed cotton is unabsorbed bleached cotton.
<3>
The surface material for sanitary materials according to <1>, wherein unabsorbed cotton is mixed with at least one type of other fiber selected from the group consisting of absorbent cotton, bleached cotton, silk fiber, and rayon fiber.
<4>
The surface material for sanitary materials according to <1>, wherein the polypropylene copolymer contains a propylene/α-olefin random copolymer.
<5>
The surface material for sanitary materials according to <1>, wherein the hydrophilic agent is at least one compound selected from the group consisting of polyoxyalkylene alkyl ether, polyoxyalkylene alkyl amide, and glycerin monofatty acid ester.
<6>
The surface material of the sanitary material according to <1>, wherein the constituent fibers of the short fiber nonwoven fabric are bonded together by hydroentanglement.
<7>
The surface material for sanitary materials according to <1>, wherein the constituent fibers of the long-fiber nonwoven fabric are bonded through partially applied thermocompression bonding parts.
<8>
A high-pressure water stream is applied to a laminate consisting of a sheet-like fiber web made of accumulated non-absorbent cotton and a long-fiber nonwoven fabric whose constituent fibers are polypropylene-based long fibers in which a hydrophilic agent is kneaded into a polypropylene-based copolymer. The method for producing a surface material for a sanitary material according to <1>, wherein the non-absorbent cotton is intertwined with each other and the non-absorbent cotton and polypropylene long fibers are entangled by the application.
本発明に係る衛生材料の表面材は、肌に接する側が未脱脂綿を構成繊維とする短繊維不織布であるため、肌当たりが良好で肌がかぶれにくいという効果を奏する。そして、短繊維不織布の裏面に、親水剤が練り込まれているポリプロピレン系長繊維を構成繊維とする長繊維不織布が接合されている。練り込まれている親水剤は、徐々に長繊維表面に移行するので、吸液しやすくなっており、短繊維不織布中の体液を速やかに吸液する。すなわち、短繊維不織布中の未脱脂綿で弾かれた体液は、速やかに裏面の長繊維不織布側に吸液されるので、体液が短繊維不織布に沿って拡散しにくく、スポット吸液性に優れるという効果を奏する。 Since the surface material of the sanitary material according to the present invention is a short fiber nonwoven fabric whose constituent fibers are non-absorbent cotton on the side that comes into contact with the skin, it feels good on the skin and is less likely to irritate the skin. A long fiber nonwoven fabric whose constituent fibers are polypropylene long fibers into which a hydrophilic agent has been kneaded is bonded to the back side of the short fiber nonwoven fabric. The kneaded hydrophilic agent gradually migrates to the surface of the long fibers, making it easier to absorb liquid, and quickly absorbs body fluids in the short fiber nonwoven fabric. In other words, body fluids that are repelled by the non-absorbent cotton in the short fiber nonwoven fabric are quickly absorbed by the long fiber nonwoven fabric on the back side, making it difficult for body fluids to spread along the short fiber nonwoven fabric, resulting in excellent spot liquid absorption. be effective.
本発明は、特定の短繊維不織布と特定の長繊維不織布とを接合することにより、上記課題を解決したものである。すなわち、本発明は、未脱脂綿を構成繊維とする短繊維不織布と、親水剤が練り込まれているポリプロピレン系長繊維を構成繊維とする長繊維不織布とが接合されてなり、前記接合は、短繊維不織布の構成繊維と長繊維不織布の構成繊維相互間が絡合することにより達成されており、前記短繊維不織布は、肌側に配置されることを特徴とする衛生材料の表面材及びその製造方法に関するものである。 The present invention solves the above problems by joining a specific short fiber nonwoven fabric and a specific long fiber nonwoven fabric. That is, in the present invention, a short fiber nonwoven fabric whose constituent fibers are non-absorbent cotton and a long fiber nonwoven fabric whose constituent fibers are polypropylene long fibers kneaded with a hydrophilic agent are joined together, This is achieved by entanglement between the constituent fibers of the fibrous nonwoven fabric and the constituent fibers of the long fiber nonwoven fabric, and the short fiber nonwoven fabric is disposed on the skin side, and the production thereof. It is about the method.
本発明に係る衛生材料の表面材は、短繊維不織布と長繊維不織布とが接合されてなるものである。本発明で用いる短繊維不織布は、未脱脂綿を構成繊維とするものである。構成繊維は未脱脂綿単独であってもよいし、未脱脂綿と他種繊維が混綿されていてもよい。他種繊維としては、脱脂綿、漂白綿、絹繊維又はレーヨン繊維等を採用することができる。他種繊維は１種を単独で採用してもよく、２種以上を併用してもよい。未脱脂綿は表面に油脂分（原綿表面に付着しているコットンワックス及び綿実油等）が残存しているものである。油脂分が残存していると、体液を弾きやすく、スポット吸液性に優れるからである。また、未脱脂綿の中でも、白色に漂白した未脱脂漂白綿を採用する方が、清潔感があるので好ましい。 The surface material of the sanitary material according to the present invention is formed by joining a short fiber nonwoven fabric and a long fiber nonwoven fabric. The short fiber nonwoven fabric used in the present invention has non-absorbent cotton as its constituent fiber. The constituent fibers may be non-absorbent cotton alone, or may be a mixture of non-absorbent cotton and other types of fibers. As other types of fibers, absorbent cotton, bleached cotton, silk fibers, rayon fibers, etc. can be adopted. One type of other types of fibers may be used alone, or two or more types may be used in combination. Unabsorbed cotton has oils and fats (cotton wax, cottonseed oil, etc. attached to the surface of the raw cotton) remaining on its surface. This is because when oil and fat remain, it easily repels body fluids and has excellent spot liquid absorption. Furthermore, among non-absorbent cotton, it is preferable to use non-absorbent bleached cotton that has been bleached white because it gives a clean feeling.
短繊維不織布は、構成繊維相互間が絡合されている。絡合させる手段としては、構成繊維が集積されてなるシート状繊維ウェブに、高圧水流を施す方法又はニードルパンチを施す方法等が挙げられる。短繊維不織布の目付は任意であるが、一般的に１５～２５ｇ／ｍ2程度の低目付である。かかる低目付の短繊維不織布の構成繊維相互間を絡合させるには、高圧水流を施す方法が適している。 In the short fiber nonwoven fabric, the constituent fibers are entangled with each other. Examples of entanglement methods include a method of applying a high-pressure water jet or a method of applying needle punching to a sheet-like fiber web formed by accumulating constituent fibers. The fabric weight of the short fiber nonwoven fabric is arbitrary, but it is generally a low fabric weight of about 15 to 25 g/m 2 . A method of applying a high-pressure water stream is suitable for entangling the constituent fibers of such a short fiber nonwoven fabric with a low basis weight.
本発明で用いる長繊維不織布を構成している長繊維は、ポリプロピレン系共重合体と親水剤を含むものである。長繊維が親水剤を含むとは、親水剤が長繊維本体に内包されていることを意味する。親水剤を含む長繊維は、例えば、ポリプロピレン系共重合体と親水剤を溶融混練し、紡糸して長繊維とすることで製造することができる。ポリプロピレン系共重合体と親水剤の溶融混練は、特に制限されず、従来公知の方法で溶融混練することができる。親水剤を長繊維表面に塗布すると、短繊維不織布側に移行しやすくなり、スポット吸液性が低下するので好ましくない。また、親水剤が塗布された長繊維は、水流交絡法に用いた場合、親水剤が水流により脱落し、スポット吸液性が低下する場合がある。 The long fibers constituting the long fiber nonwoven fabric used in the present invention contain a polypropylene copolymer and a hydrophilic agent. When the long fibers contain a hydrophilic agent, it means that the hydrophilic agent is encapsulated in the long fiber main body. A long fiber containing a hydrophilic agent can be produced, for example, by melt-kneading a polypropylene-based copolymer and a hydrophilic agent, and spinning the mixture into long fibers. Melt-kneading of the polypropylene copolymer and the hydrophilic agent is not particularly limited, and can be performed by any conventionally known method. If a hydrophilic agent is applied to the surface of the long fibers, it is undesirable because it tends to migrate to the short fiber nonwoven fabric side and the spot liquid absorbency decreases. Furthermore, when long fibers coated with a hydrophilic agent are used in a hydroentangling method, the hydrophilic agent may fall off due to the water flow, resulting in a decrease in spot liquid absorbency.
ポリプロピレン系共重合体としては、プロピレン・α－オレフィンランダム共重合体、プロピレン・α－オレフィンブロック共重合体又はプロピレン単独重合体等が用いられる。ここで、α－オレフィンとしては、エチレン、１－ブテン、１－ペンテン、１－ヘキセン、１－オクテン、４－メチル－１－ペンテン等のプロピレン以外のα－オレフィンが用いられる。かかるα－オレフィンとプロピレンとを共重合することにより、長繊維の結晶化が低下し、練り込まれている親水剤が徐々に長繊維表面に移行しやすくなり、スポット吸液性に優れる傾向がある。このため、長繊維は、プロピレン・α－オレフィンランダム共重合体を含むことが好ましく、長繊維の全質量に対して９０質量％以上含むことがより好ましい。なお、α－オレフィンの共重合量は、１～１０モル％が好ましい。 As the polypropylene copolymer, a propylene/α-olefin random copolymer, a propylene/α-olefin block copolymer, a propylene homopolymer, or the like is used. Here, as the α-olefin, α-olefins other than propylene such as ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, and 4-methyl-1-pentene are used. By copolymerizing such α-olefin and propylene, the crystallization of the long fibers is reduced, and the incorporated hydrophilic agent gradually migrates to the surface of the long fibers, which tends to have excellent spot liquid absorption. be. Therefore, the long fibers preferably contain a propylene/α-olefin random copolymer, more preferably 90% by mass or more based on the total mass of the long fibers. Note that the copolymerized amount of α-olefin is preferably 1 to 10 mol%.
ポリプロピレン系共重合体のメルトフローレイト（ＭＦＲ、ＡＳＴＭ Ｄ１２３８、２３０℃、荷重２１６０ｇ）は、溶融紡糸可能であれば、特に限定されない。例えば、ＭＦＲは、１ｇ／１０分～１０００ｇ／１０分であってもよく、５ｇ／１０分～５００ｇ／１０分であることが好ましく、１０ｇ／１０分～１００ｇ／１０分であることがより好ましい。ポリプロピレン系共重合体のＭＦＲが上記範囲内であると、強度が向上する傾向にあり、好ましい。ポリプロピレン系共重合体の融点は、長繊維の製造に適した範囲であれば特に制限されないが、親水剤の長繊維への移行の観点から、１２５℃～１５５℃が好ましく、１３０℃～１５０℃がより好ましい。長繊維は、前述のポリプロピレン系共重合体以外の他の共重合体を含んでいてもよい。他の共重合体としては、ポリエチレン及びポリブテンなどのポリオレフィンや、ポリアミド、ポリエステルなどが挙げられる。 The melt flow rate (MFR, ASTM D1238, 230° C., load 2160 g) of the polypropylene copolymer is not particularly limited as long as it can be melt-spun. For example, the MFR may be 1 g/10 minutes to 1000 g/10 minutes, preferably 5 g/10 minutes to 500 g/10 minutes, and more preferably 10 g/10 minutes to 100 g/10 minutes. . It is preferable that the MFR of the polypropylene copolymer is within the above range because the strength tends to improve. The melting point of the polypropylene copolymer is not particularly limited as long as it is within a range suitable for producing long fibers, but from the viewpoint of transferring the hydrophilic agent to long fibers, it is preferably 125°C to 155°C, and 130°C to 150°C. is more preferable. The long fibers may contain copolymers other than the above-mentioned polypropylene copolymers. Other copolymers include polyolefins such as polyethylene and polybutene, polyamides, polyesters, and the like.
長繊維は、従来公知の親水剤を含む。親水剤としては、例えば、非イオン性界面活性剤が挙げられる。非イオン性界面活性剤としては、ポリオキシアルキレンアルキルエーテル、ポリオキシアルキレンアルキルアミド、グリセリンモノ脂肪酸エステル、多価アルコール脂肪酸エステル、ポリオキシアルキレン脂肪酸エステル、アルキルポリオキシエチレンアルコール、多価アルコール脂肪酸エステルのアルキレンオキシド付加物、アルコキシ化アルキルフェノールなどが挙げられる。これらの親水剤は、１種単独で、または複数種を混合して用いられる。これらの中でも親水剤としては、優れた親水性を付与する観点で、ポリオキシアルキレンアルキルエーテル、ポリオキシアルキレンアルキルアミド及びグリセリンモノ脂肪酸エステルからなる群より選ばれる少なくとも一種を含むことが好ましく、ポリオキシアルキレンアルキルエーテル、ポリオキシアルキレンアルキルアミド及びグリセリンモノ脂肪酸エステルを含むことがより好ましい。 The long fibers contain a conventionally known hydrophilic agent. Examples of the hydrophilic agent include nonionic surfactants. Examples of nonionic surfactants include polyoxyalkylene alkyl ethers, polyoxyalkylene alkylamides, glycerin monofatty acid esters, polyhydric alcohol fatty acid esters, polyoxyalkylene fatty acid esters, alkylpolyoxyethylene alcohols, and polyhydric alcohol fatty acid esters. Examples include alkylene oxide adducts and alkoxylated alkylphenols. These hydrophilic agents may be used alone or in combination. Among these, the hydrophilic agent preferably contains at least one selected from the group consisting of polyoxyalkylene alkyl ether, polyoxyalkylene alkyl amide, and glycerin monofatty acid ester, from the viewpoint of imparting excellent hydrophilicity; More preferably, it contains alkylene alkyl ether, polyoxyalkylene alkyl amide, and glycerin monofatty acid ester.
ポリオキシアルキレンアルキルエーテルとしては、たとえば、オキシアルキレン基がオキシエチレン基又はオキシプロピレン基であり、アルキル基が炭素数８～２０のアルキル基であるのが好ましい。具体的には、ポリオキシエチレンステアリルエーテル、ポリオキシエチレンヘキサデシルエーテル、ポリオキシエチレンテトラデシルエーテル、ポリオキシエチレンドデシルエーテル、ポリオキシエチレンデシルエーテル、ポリオキシエチレンオクチルエーテル、ポリオキシプロピレンステアリルエーテル、ポリオキシプロピレンヘキサデシルエーテル、ポリオキシプロピレンテトラデシルエーテル、ポリオキシプロピレンドデシルエーテル、ポリオキシプロピレンデシルエーテル又はポリオキシプロピレンオクチルエーテル等が用いられる。オキシアルキレン基の付加モル数は、特に制限されないが、親水性をより向上させる観点から、３モル～２０モルが好ましい。ポリオキシアルキレンアルキルエーテルとしては、親水性の観点から、ポリオキシエチレンステアリルエーテルが好ましい。 In the polyoxyalkylene alkyl ether, for example, the oxyalkylene group is preferably an oxyethylene group or oxypropylene group, and the alkyl group is preferably an alkyl group having 8 to 20 carbon atoms. Specifically, polyoxyethylene stearyl ether, polyoxyethylene hexadecyl ether, polyoxyethylene tetradecyl ether, polyoxyethylene dodecyl ether, polyoxyethylene decyl ether, polyoxyethylene octyl ether, polyoxypropylene stearyl ether, Oxypropylene hexadecyl ether, polyoxypropylene tetradecyl ether, polyoxypropylene dodecyl ether, polyoxypropylene decyl ether, polyoxypropylene octyl ether, etc. are used. The number of moles of the oxyalkylene group added is not particularly limited, but from the viewpoint of further improving hydrophilicity, it is preferably 3 to 20 moles. As the polyoxyalkylene alkyl ether, polyoxyethylene stearyl ether is preferable from the viewpoint of hydrophilicity.
ポリオキシアルキレンアルキルアミドとしては、ポリオキシエチレンラウリルアミドやポリオキシエチレンステアリルアミド、ポリオキシプロピレンラウリルアミド、ポリオキシプロピレンステアリルアミド等を採用するのが好ましい。 As the polyoxyalkylene alkylamide, it is preferable to employ polyoxyethylene laurylamide, polyoxyethylene stearylamide, polyoxypropylene laurylamide, polyoxypropylene stearylamide, etc.
グリセリンモノ脂肪酸エステルとしては、グリセリンモノステアレートやグリセリンモノオレエート等を採用することができる。 As the glycerin monofatty acid ester, glycerin monostearate, glycerin monooleate, etc. can be employed.
長繊維中に含有される親水剤の量は、親水性をより向上させる観点から、長繊維の全質量に対して、０．５～５質量％が好ましい。 The amount of the hydrophilic agent contained in the long fibers is preferably 0.5 to 5% by mass based on the total mass of the long fibers, from the viewpoint of further improving hydrophilicity.
長繊維不織布を構成する長繊維の平均繊維径は、５μｍ～３０μｍが好ましい。長繊維の平均繊維径は、光学顕微鏡を用いて単繊維の繊維径を１００本測定し、平均値とすることで求めることができる。長繊維相互間は、従来公知の方法で結合されていることが好ましい。具体的には、長繊維相互間が部分的に施された熱圧着部位で結合しているのが好ましい。非熱圧着部位の長繊維が動きやすく、短繊維と絡合しやすいからである。長繊維不織布の目付は、１０～８０ｇ／ｍ2が好ましく、１１～７５ｇ／ｍ2がより好ましく、１２～７０ｇ／ｍ2がさらに好ましい。長繊維不織布が熱圧着加工されている場合、刻印形状は特に制限されず、円、楕円、ひし形等の従来公知の形状にすることができる。長繊維不織布における熱圧着部の面積率は、長繊維不織布の全面積に対して、５％～３０％が好ましく、５％～２０％がより好ましい。 The average fiber diameter of the long fibers constituting the long fiber nonwoven fabric is preferably 5 μm to 30 μm. The average fiber diameter of the long fibers can be determined by measuring the fiber diameters of 100 single fibers using an optical microscope and taking the average value. It is preferable that the long fibers are bonded to each other by a conventionally known method. Specifically, it is preferable that the long fibers are bonded to each other at a partially applied thermocompression bonding site. This is because the long fibers in the non-thermocompression bonded area are easy to move and entangled with the short fibers. The basis weight of the long fiber nonwoven fabric is preferably 10 to 80 g/m 2 , more preferably 11 to 75 g/m 2 , even more preferably 12 to 70 g/m 2 . When the long fiber nonwoven fabric is subjected to thermocompression bonding, the shape of the stamp is not particularly limited, and can be any conventionally known shape such as a circle, an ellipse, or a diamond. The area ratio of the thermocompression bonded portion in the long fiber nonwoven fabric is preferably 5% to 30%, more preferably 5% to 20%, based on the total area of the long fiber nonwoven fabric.
長繊維は、本発明の目的を損なわない範囲で、任意成分として、酸化防止剤、耐熱安定剤、耐候安定剤、帯電防止剤、スリップ剤、防曇剤、滑剤、染料、顔料、天然油、合成油、ワックス等の種々公知の添加剤を含んでもよい。これらの添加剤は、長繊維に内包されていてもよく、繊維の表面に付着していてもよい。 The long fibers may contain antioxidants, heat-resistant stabilizers, weather-resistant stabilizers, antistatic agents, slip agents, antifogging agents, lubricants, dyes, pigments, natural oils, It may also contain various known additives such as synthetic oil and wax. These additives may be included in the long fibers or may be attached to the surface of the fibers.
長繊維不織布の製造方法は特に制限されず、従来公知の方法で製造することができる。長繊維不織布の製造方法としては、具体的には、スパンボンド法、メルトブローン法、フラッシュ紡糸法、静電紡糸法等が挙げられる。これらの中でも、生産性の観点からスパンボンド法が好ましい。 The method for producing the long fiber nonwoven fabric is not particularly limited, and it can be produced by a conventionally known method. Specific examples of the method for producing the long fiber nonwoven fabric include spunbond method, melt blown method, flash spinning method, electrostatic spinning method, and the like. Among these, the spunbond method is preferred from the viewpoint of productivity.
長繊維相互間の結合方法は、特に制限されないが、例えば、熱圧着加工、超音波融着等の熱融着法、ニードルパンチを一例とする機械的交絡法を上げることができる。これらの中でも、非結合部位の長繊維が動きやすく、短繊維と絡合しやすいため、熱圧着加工が好ましい。熱圧着加工は、従来公知の方法で行うことができる。例えば、刻印形状を有するエンボスロールと、平滑ロールの間に、長繊維不織布を通すことにより行うことができる。刻印形状を有するエンボスロール間に長繊維不織布を通してもよい。エンボスロールの温度は、長繊維不織布を熱圧着することができれば特に制限されず、例えば、１００℃～１４０℃とすることができる。線圧力は、長繊維不織布を熱圧着することができれば特に制限されず、例えば、１０Ｎ／６０ｍｍ～２００Ｎ／６０ｍｍとすることができる。 The method for bonding the long fibers to each other is not particularly limited, but may include, for example, thermocompression bonding, heat fusing methods such as ultrasonic welding, and mechanical entangling methods such as needle punching. Among these, thermocompression bonding is preferred because the long fibers in the non-bonded portion are easy to move and entangle with the short fibers. The thermocompression bonding process can be performed by a conventionally known method. For example, it can be carried out by passing a long fiber nonwoven fabric between an embossing roll having a stamped shape and a smooth roll. The long fiber nonwoven fabric may be passed between embossing rolls having a stamped shape. The temperature of the embossing roll is not particularly limited as long as it can thermocompress the long fiber nonwoven fabric, and can be, for example, 100°C to 140°C. The linear pressure is not particularly limited as long as the long fiber nonwoven fabric can be bonded by thermocompression, and can be, for example, 10 N/60 mm to 200 N/60 mm.
短繊維不織布と長繊維不織布とは、各々の構成繊維が絡合することにより、接合されている。各々の構成繊維を絡合するには、高圧水流を施すか又はニードルパンチを施せばよい。そして、短繊維不織布側を肌側とすることで、肌当たりが良好で肌がかぶれにくい衛生材料の表面材となる。 The short fiber nonwoven fabric and the long fiber nonwoven fabric are joined by intertwining their constituent fibers. In order to entangle each constituent fiber, a high-pressure water stream or a needle punch may be applied. By making the short fiber nonwoven fabric side the skin side, the surface material of the sanitary material has good contact with the skin and does not cause irritation to the skin.
本発明に係る衛生材料の表面材は、以下の製造方法により合理的に得られる。すなわち、以下の製造方法によって、短繊維不織布を得ると同時に短繊維不織布と長繊維不織布とを接合できるのである。かかる製造方法は、未脱脂綿が集積されてなるシート状繊維ウェブと、ポリプロピレン系共重合体に親水剤が練り込まれているポリプロピレン系長繊維を構成繊維とする長繊維不織布とを積層した積層体に、高圧水流を施すことにより、未脱脂綿相互間を絡合せしめると共に、未脱脂綿とポリプロピレン系長繊維を絡合せしめるというものである。 The surface material of the sanitary material according to the present invention can be reasonably obtained by the following manufacturing method. That is, by the following manufacturing method, a short fiber nonwoven fabric can be obtained and at the same time a short fiber nonwoven fabric and a long fiber nonwoven fabric can be joined. This manufacturing method involves producing a laminate in which a sheet-like fiber web formed by collecting non-absorbent cotton and a long-fiber nonwoven fabric whose constituent fibers are polypropylene-based long fibers in which a hydrophilic agent is kneaded into a polypropylene-based copolymer. Then, by applying a high-pressure water jet, the non-absorbent cotton is entangled with each other, and the non-absorbent cotton and the polypropylene long fibers are entangled.
未脱脂綿が集積されてなるシート状繊維ウェブは、未脱脂綿（必要により他種繊維を混綿したもの）をカード機で開繊しながらコンベア上に堆積させることにより得られる。そして、このシート状繊維ウェブと長繊維不織布とを積層し、主としてシート状繊維ウェブ側から高圧水流を施す。これにより、シート状繊維ウェブ中の未脱脂綿が絡合して短繊維不織布が形成されると共に、未脱脂綿と長繊維不織布中の長繊維とが絡合し、短繊維不織布と長繊維不織布が接合されることになるのである。 A sheet-like fibrous web in which non-absorbent cotton is accumulated is obtained by depositing non-absorbent cotton (mixed with other types of fibers if necessary) on a conveyor while being opened with a card machine. Then, this sheet-like fibrous web and the long fiber nonwoven fabric are laminated, and a high-pressure water jet is applied mainly from the sheet-like fibrous web side. As a result, the unabsorbed cotton in the sheet-like fiber web is entangled to form a short fiber nonwoven fabric, and the unabsorbed cotton and the long fibers in the long fiber nonwoven fabric are entangled, and the short fiber nonwoven fabric and the long fiber nonwoven fabric are joined. It will be done.
生理用ナプキンや使い捨ておむつ等の衛生材料は、肌に接する表面材と下着に防漏材との間に吸液体が挟まれてなるものである。本発明に係る衛生材料の表面材は、短繊維不織布側と肌側となるようにして衛生材料に適用されるのである。 Sanitary materials such as sanitary napkins and disposable diapers are made by sandwiching an absorbent liquid between a surface material that comes into contact with the skin and a leak-proof material in underwear. The surface material of the sanitary material according to the present invention is applied to the sanitary material so that the short fiber nonwoven fabric side and the skin side are on the surface material.
実施例
ポリオキシエチレン（５モル）ステアリルエーテル５０重量％、ポリオキシエチレン（１０モル）ステアリルアミド２５重量％及びグリセリンモノステアレート２５重量％を含む親水剤２０重量部と、ＭＦＲ：６０ｇ／１０分のプロピレン単独重合体８０重量部と、酸化防止剤（Ｃｉｂａ社製、商品名Ｉｒｇａｆｏｓ １６８）０．０５重量部を、２３０℃で溶融混練して押出し、ペレット状のマスターバッチを用意した。
Example 20 parts by weight of a hydrophilic agent containing 50% by weight of polyoxyethylene (5 mol) stearyl ether, 25% by weight of polyoxyethylene (10 mol) stearyl amide and 25% by weight of glycerin monostearate, MFR: 60 g/10 min. 80 parts by weight of a propylene homopolymer and 0.05 parts by weight of an antioxidant (manufactured by Ciba, trade name Irgafos 168) were melt-kneaded at 230°C and extruded to prepare a pellet-shaped masterbatch.
次いで、融点（Ｔｍ）１４２℃、ＭＦＲ６０ｇ／１０分のプロピレン・エチレンランダム共重合体１００重量部に対して、前記マスターバッチを８．１重量部加えて混合し、長繊維不織布製造用のポリプロピレン系共重合体組成物を用意した。 Next, 8.1 parts by weight of the masterbatch was added to 100 parts by weight of a propylene/ethylene random copolymer with a melting point (Tm) of 142° C. and an MFR of 60 g/10 minutes, and mixed to form a polypropylene-based polypropylene-based copolymer for producing long-fiber nonwoven fabrics. A copolymer composition was prepared.
次いで、ポリプロピレン系共重合体組成物をスパンボンド法により溶融紡糸し、長繊維を得ると共に集積したウェブに、熱圧着加工を行い、目付け２０ｇ／ｍ2の長繊維不織布を得た。なお、熱圧着加工は、刻印形状が菱形、エンボス面積率が１８％、エンボス面積（刻印一つ当たりの面積）が０．４１ｍｍ2のエンボスロールと、平滑ロールの間にウェブを通し、この際の温度を１２５℃、線圧力を６０Ｎ／ｍｍとして行った。以上のようにして、長繊維の平均繊維径が１８μｍで、目付２０ｇ／ｍ2の長繊維不織布を製造した。 Next, the polypropylene copolymer composition was melt-spun using a spunbond method to obtain long fibers, and the assembled web was subjected to thermocompression bonding to obtain a long fiber nonwoven fabric with a basis weight of 20 g/m 2 . The thermocompression bonding process is performed by passing the web between an embossing roll with a diamond-shaped stamp, an emboss area ratio of 18%, and an emboss area (area per stamp) of 0.41 mm 2 and a smooth roll. The temperature was 125° C. and the linear pressure was 60 N/mm. As described above, a long fiber nonwoven fabric having an average fiber diameter of 18 μm and a basis weight of 20 g/m 2 was produced.
一方、平均繊維長２５ｍｍの未脱脂漂白綿を、パラレルカード機で開繊及び集積し、目付２０ｇ／ｍ2のシート状繊維ウェブを得た。このシート状繊維ウェブを、コンベアに載置した前記長繊維不織布の上に積層し、搬送した。そして、孔径０．１ｍｍの噴出孔が孔間隔０．６ｍｍで横一列に配置された水流噴出装置を用い、シート状繊維ウェブ側から３ＭＰａの噴出圧力で高圧水流を施し、次いで６ＭＰａの噴出圧力で高圧水流を施した。この二回の高圧水流処理により、未脱脂漂白綿相互間及び未脱脂漂白綿と長繊維相互間を絡合せしめ、短繊維不織布と長繊維不織布とが接合されてなる衛生材料の表面材を得た。 On the other hand, undefatted bleached cotton with an average fiber length of 25 mm was opened and stacked using a parallel card machine to obtain a sheet-like fibrous web with a basis weight of 20 g/m 2 . This sheet-like fibrous web was laminated on the long fiber nonwoven fabric placed on a conveyor and conveyed. Then, using a water jet device in which jet holes with a hole diameter of 0.1 mm are arranged horizontally in a row with a hole interval of 0.6 mm, a high-pressure water jet is applied from the sheet-like fiber web side at a jet pressure of 3 MPa, and then at a jet pressure of 6 MPa. A high pressure water jet was applied. Through this two-time high-pressure water treatment, the non-defatted bleached cotton and the non-defatted bleached cotton and the long fibers are intertwined, and a surface material for sanitary materials in which the short fiber nonwoven fabric and the long fiber nonwoven fabric are bonded is obtained. Ta.
この衛生材料の表面材の短繊維不織布側に、青色に着色された着色水を１ｃｃ滴下し、５分間静置した。そして、着色水の縦方向及び横方向の拡がり径を測定し、両者の拡がり径を加算したところ、約４９ｍｍであった。一般に、拡がり径が８０ｍｍ以下であるとスポット吸液性が良好であるといわれており、実施例に係る衛生材料の表面材は、スポット吸液性に優れたものであると認められる。 1 cc of blue colored water was dropped onto the short fiber nonwoven fabric side of the surface material of this sanitary material and left to stand for 5 minutes. Then, the lengthwise and horizontally spread diameters of the colored water were measured, and the sum of the two spread diameters was about 49 mm. Generally, it is said that spot liquid absorbency is good when the spread diameter is 80 mm or less, and the surface material of the sanitary material according to the example is recognized to have excellent spot liquid absorbency.
Claims (8)
前記接合は、短繊維不織布の構成繊維と長繊維不織布の構成繊維相互間が絡合することにより達成されており、
前記短繊維不織布は、肌側に配置されることを特徴とする衛生材料の表面材。 A short fiber nonwoven fabric whose constituent fibers are non-absorbent cotton and a long fiber nonwoven fabric whose constituent fibers are polypropylene long fibers containing a polypropylene copolymer and a hydrophilic agent are joined together, and the hydrophilic agent is the polypropylene long fibers. It is included in the main body,
The joining is achieved by entanglement between the constituent fibers of the short fiber nonwoven fabric and the constituent fibers of the long fiber nonwoven fabric,
A surface material for sanitary materials, characterized in that the short fiber nonwoven fabric is placed on the skin side.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005312700A (en) | 2004-04-28 | 2005-11-10 | Mitsui Chemicals Inc | Humidity sensor sheet |
| JP2013027686A (en) | 2011-06-23 | 2013-02-07 | Kao Corp | Absorbent article |
| JP3218416U (en) | 2018-08-02 | 2018-10-11 | ユニチカ株式会社 | Top sheet for absorbent articles |
| WO2019147091A1 (en) | 2018-01-26 | 2019-08-01 | 도레이첨단소재 주식회사 | Hygroscopic nonwoven fabric and manufacturing method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005312700A (en) | 2004-04-28 | 2005-11-10 | Mitsui Chemicals Inc | Humidity sensor sheet |
| JP2013027686A (en) | 2011-06-23 | 2013-02-07 | Kao Corp | Absorbent article |
| WO2019147091A1 (en) | 2018-01-26 | 2019-08-01 | 도레이첨단소재 주식회사 | Hygroscopic nonwoven fabric and manufacturing method therefor |
| JP3218416U (en) | 2018-08-02 | 2018-10-11 | ユニチカ株式会社 | Top sheet for absorbent articles |
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