JP2011030940A - Surface sheet of absorbent article - Google Patents

Surface sheet of absorbent article Download PDF

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JP2011030940A
JP2011030940A JP2009182451A JP2009182451A JP2011030940A JP 2011030940 A JP2011030940 A JP 2011030940A JP 2009182451 A JP2009182451 A JP 2009182451A JP 2009182451 A JP2009182451 A JP 2009182451A JP 2011030940 A JP2011030940 A JP 2011030940A
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fiber
absorbent article
surface sheet
fibers
nonwoven fabric
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Atsushi Matsunaga
篤 松永
Norihisa Yoshida
典古 吉田
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Unitika Ltd
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Unitika Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface sheet which uses a cotton fiber that is a natural fiber, allows speedy passage of a body fluid, prevents reversal of the passed body fluid, and gives no unpleasantness due to stickiness to a user. <P>SOLUTION: The surface sheet of an absorbent article comprises a bleached cotton fiber with a natural fat oil attached and a thermoplastic short fiber in which at least a surface of the fiber comprises an olefinic polymer. It comprises a nonwoven fabric in which constitutive fibers three-dimensionally intersect each other and to which a lipophilic glycerin fatty acid ester is affixed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、使い捨てオムツや生理用ナプキン、パンティライナー等の吸収性物品の表面シートに関するものである。   The present invention relates to a surface sheet of an absorbent article such as a disposable diaper, a sanitary napkin, or a panty liner.

使い捨てオムツや生理用ナプキン等の吸水性物品は、大別して表面層、吸収層、防漏れ層の3層からなり、体から分泌される体液は、表面層における表面シートに、すばやく引き込まれ、かつ透過されて、表面層下の吸収層へ移動し吸収拡散される。したがって、表面シートには、液透過性が要求されるため、疎水性の合成繊維からなる極めて薄い不織シートや孔開きフィルムが多く使用されている。しかし、吸収性物品の表面シートは、直接肌に触れる部分であることから、合成繊維のみからなるシートでは、痒みやかぶれ等が発生する場合があり、天然素材を用いたシートが求められている。   Water-absorbing articles such as disposable diapers and sanitary napkins are roughly divided into three layers: a surface layer, an absorbent layer, and a leak-proof layer. Body fluids secreted from the body are quickly drawn into the surface sheet in the surface layer, and After being transmitted, it moves to the absorption layer below the surface layer and is absorbed and diffused. Therefore, since the surface sheet is required to have liquid permeability, an extremely thin nonwoven sheet or a perforated film made of a hydrophobic synthetic fiber is often used. However, since the surface sheet of the absorbent article is a part that directly touches the skin, a sheet made of only synthetic fibers may cause itching and rash, and a sheet using a natural material is required. .

代表的な天然素材としては、木綿繊維が挙げられる。一般の木綿繊維は、漂白された脱脂綿である。これは、漂白前に精錬処理が施されて繊維表面のワックスや天然油脂が除去される(脱脂される)からである。このような木綿繊維(脱脂綿繊維)を吸収性物品の表面シートを構成する繊維として適用すると、綿繊維自身が吸液性、保液性に優れるため、分泌された体液は、表面シートを透過せず、ここで吸収・保液してしまうため、着用者にはべたつきによる不快感を与えやすい。   A typical natural material is cotton fiber. Common cotton fibers are bleached cotton wool. This is because a refining treatment is performed before bleaching to remove (degrease) the wax and natural oil on the fiber surface. When such cotton fibers (absorbent cotton fibers) are applied as fibers constituting the surface sheet of the absorbent article, the cotton fibers themselves are excellent in liquid absorbency and liquid retention, so that the secreted body fluid permeates the surface sheet. However, since it absorbs and retains liquid here, it is easy to give the wearer discomfort due to stickiness.

本件出願人は、上記問題を解決するために、天然油脂が付着した脱脂綿と、オレフィン系繊維とからなる不織布であって、特定の開孔を有する不織布を吸収性物品の表面シートに用いることを提案している(特許文献1 請求項5、請求項10等)。   In order to solve the above problem, the applicant of the present invention is to use a non-woven fabric composed of absorbent cotton to which natural fats and oils adhere and an olefin fiber, and having a specific opening for the top sheet of the absorbent article. It has been proposed (Patent Document 1, Claim 5, Claim 10, etc.).

特開2005−139594号公報JP 2005-139594 A

本発明の課題は、天然繊維である綿繊維を用いたシートであって、さらに、体液を素早く通過し、かつ移行した体液戻り性がなく、着用者にはべたつきによる不快感を与えることのない表面シートを提供することにある。   An object of the present invention is a sheet using cotton fibers, which are natural fibers, and further passes through body fluids quickly and does not return to the transferred body fluids, so that the wearer does not feel uncomfortable due to stickiness. It is to provide a face sheet.

すなわち、本発明は、天然油脂が付着した漂白綿繊維と、少なくとも繊維表面がオレフィン系重合体からなる熱可塑性短繊維とにより構成され、構成繊維同士が三次元的に交絡してなる不織布であり、不織布には親油性グリセリン脂肪酸エステルが付着しており、該不織布によって構成されることを特徴とする吸収性物品の表面シートを要旨とするものである。   That is, the present invention is a non-woven fabric formed by bleached cotton fibers to which natural oils and fats are attached and thermoplastic short fibers having at least the fiber surface made of an olefin polymer, and the constituent fibers are entangled three-dimensionally. A lipophilic glycerin fatty acid ester is adhered to the non-woven fabric, and the gist of the surface sheet of the absorbent article is constituted by the non-woven fabric.

以下、本発明について詳細に説明する。   Hereinafter, the present invention will be described in detail.

本発明の吸収性物品の表面シートを構成する不織布は、天然油脂が付着した漂白綿繊維と、少なくとも繊維表面がポリオレフィン系重合体からなる熱可塑性短繊維とから構成される。   The nonwoven fabric which comprises the surface sheet of the absorbent article of this invention is comprised from the bleached cotton fiber to which natural fats and oils adhered, and the thermoplastic short fiber which a fiber surface consists of a polyolefin polymer at least.

本発明における漂白綿繊維とは、コットン繊維とも呼ばれる天然繊維のことであって、原綿が漂白されたものである。一般に、原綿を均一に漂白するには、脱脂綿の製造工程と同様の工程が採用されるため、漂白された綿繊維というと、繊維表面に付着している天然油脂が除去された脱脂綿繊維を指すが、本発明においては、漂白されているにもかかわらず、繊維表面の天然油脂が付着してなる漂白綿繊維を用いる。このような天然油脂が付着してなる漂白綿繊維は、特開2003−247161に開示されている天然繊維の未脱脂漂白方法によって得ることができる。すなわち、原綿を、オキシ過カルボン酸を含有する漂白用水溶液に接触させることにより、天然油脂が残存しながら良好に漂白されてなる綿繊維を得ることができる。そして、この方法により得られた漂白綿繊維は、繊維表面に0.3〜0.6質量%の天然油脂が付着している。なお、一般に原綿には、コットンワックス(天然油脂)が約0.6質量%付着している。また、本発明においては、上記した天然油脂が付着してなる漂白綿繊維を原料として用いた不織布であるが、後述する不織布化手段(交絡処理)によって、漂白綿繊維に付着してなる天然油脂の量はほとんど変化せず、綿繊維でありながら適度な撥水性を有している。   The bleached cotton fiber in the present invention is a natural fiber also called a cotton fiber, and is obtained by bleaching raw cotton. In general, in order to uniformly bleach raw cotton, the same process as the manufacturing process of absorbent cotton is adopted. Therefore, bleached cotton fiber refers to absorbent cotton fiber from which natural oils and fats adhering to the fiber surface have been removed. However, in the present invention, bleached cotton fibers to which natural fats and oils on the surface of the fibers are attached even though they are bleached are used. Bleached cotton fibers to which such natural fats and oils are attached can be obtained by the non-degreasing bleaching method for natural fibers disclosed in JP-A-2003-247161. That is, by bringing the raw cotton into contact with an aqueous bleaching solution containing oxypercarboxylic acid, it is possible to obtain cotton fibers that are satisfactorily bleached while remaining natural fats and oils. And as for the bleached cotton fiber obtained by this method, 0.3-0.6 mass% natural fats and oils have adhered to the fiber surface. In general, about 0.6% by mass of cotton wax (natural oil) is attached to the raw cotton. Moreover, in this invention, although it is a nonwoven fabric which uses the above-mentioned bleached cotton fiber to which natural fats and oils adhere as a raw material, natural fats and oils which adhere to bleached cotton fibers by the nonwoven fabric forming means (entanglement process) mentioned later The amount of is almost unchanged, and it has moderate water repellency despite being a cotton fiber.

本発明の熱可塑性短繊維を構成するポリオレフィン系重合体としては、ポリプロピレン、ポリエチレン、エチレンとプロピレンとの共重合体、またはこれらのブレンド体等が挙げられる。少なくとも繊維表面がポリオレフィン系重合体からなる熱可塑性短繊維の繊維形態としては、上記したポリオレフィン系重合体単独からなる単相型の繊維、あるいは、芯部を鞘部が覆ってなる芯鞘複合型であって、鞘部にポリオレフィン系重合体を配した芯鞘複合繊維等が挙げられる。少なくとも繊維表面がポリオレフィン系重合体からなる繊維を採用することにより、不織布に適度の疎水性を付与することができる。また、熱可塑性短繊維として、芯部に高融点ポリオレフィン系重合体、鞘部に低融点ポリオレフィン系重合体を配した芯鞘複合型の繊維を採用した場合、得られた不織布に熱処理を施して、鞘部の低融点ポリオレフィン系重合体を溶融または軟化させて熱接着成分として機能させることによって得られる表面シートの形態保持性の向上、機械的強力の向上を図ることができる。   Examples of the polyolefin-based polymer constituting the thermoplastic short fiber of the present invention include polypropylene, polyethylene, a copolymer of ethylene and propylene, or a blend thereof. As the fiber form of the thermoplastic short fiber having at least the fiber surface made of a polyolefin polymer, a single-phase fiber made of the above-mentioned polyolefin polymer alone, or a core-sheath composite type in which the sheath part covers the core part And the core-sheath composite fiber etc. which arranged the polyolefin-type polymer in the sheath part are mentioned. By adopting a fiber having at least a fiber surface made of a polyolefin-based polymer, moderate hydrophobicity can be imparted to the nonwoven fabric. In addition, when the core-sheath composite type fiber having a high melting point polyolefin polymer in the core and a low melting point polyolefin polymer in the sheath is adopted as the thermoplastic short fiber, the obtained nonwoven fabric is subjected to heat treatment. The shape retention of the surface sheet obtained by melting or softening the low-melting-point polyolefin polymer in the sheath part to function as a heat-bonding component can be improved, and the mechanical strength can be improved.

熱可塑性短繊維としては、撥水性油剤を付着したものを用いることが好ましい。撥水性油剤が付与された熱可塑性短繊維を用いると、得られる不織布が撥水性を有するものとなる。撥水性油剤としては、公知のものを使用することができるが、本発明においては、直接肌に触れる用途に好適に用いることを考慮して、肌への刺激が少ないものを使用することが好ましい。例えば、特開2002−302871に開示されている炭素数12〜18のアルキルホスフェート塩から選ばれた少なくとも一種のアルキルホスフェート塩成分(成分A)50〜80質量%、フッ素系化合物含有成分(成分B)10〜30質量%、ポリ(オキシエチレン)アルキルエーテル成分(成分C)10〜30質量%からなりpHが6.0〜8.0である界面活性剤組成物を好適に用いることができる。なお、熱可塑性短繊維に付与された撥水性油剤は、構成繊維同士の交絡手段として高圧水流処理を採用した場合、親水性はなく撥水するために、繊維表面の撥水性油剤のほとんどは水流により除去されず、得られる不織布においてもほぼ同量の油剤が付着して、撥水性を奏する。   As the thermoplastic short fibers, it is preferable to use those to which a water-repellent oil agent is attached. When the thermoplastic short fiber to which the water repellent oil is added is used, the resulting nonwoven fabric has water repellency. As the water repellent oil, known ones can be used. However, in the present invention, it is preferable to use one that is less irritating to the skin, considering that it is suitably used for direct skin contact. . For example, 50-80% by mass of at least one alkyl phosphate salt component (component A) selected from alkyl phosphate salts having 12 to 18 carbon atoms disclosed in JP-A No. 2002-302871, a fluorine-containing compound-containing component (component B) A surfactant composition having 10 to 30% by mass and 10 to 30% by mass of a poly (oxyethylene) alkyl ether component (component C) and having a pH of 6.0 to 8.0 can be suitably used. Note that the water-repellent oil applied to the thermoplastic short fibers is not hydrophilic and water-repellent when a high-pressure water flow treatment is used as a means for entanglement of the constituent fibers. In the non-woven fabric obtained, almost the same amount of oil agent adheres to the resulting non-woven fabric and exhibits water repellency.

熱可塑性短繊維の単糸繊度および繊維長は、特に限定されないが、不織布の柔軟性、綿繊維との交絡性を考慮して、単糸繊度が1〜8デシテックス程度で、平均繊維長が15〜70mm程度のものを用いるとよい。   The single yarn fineness and fiber length of the thermoplastic short fiber are not particularly limited, but the single yarn fineness is about 1 to 8 dtex and the average fiber length is 15 in consideration of the flexibility of the nonwoven fabric and the entanglement with the cotton fiber. It is good to use a thing of about 70 mm.

不織布における漂白綿繊維と熱可塑性短繊維との混合比率は、漂白綿繊維/熱可塑性短繊維が30/70〜70/30(質量比)の範囲で適宜選択すればよい。漂白綿繊維の混合比率が多くなると、良好な肌触り感に優れるものとなり、一方、熱可塑性短繊維の混合比が多くなると、疎水性繊維の含有量が増すために、より液透過性に優れたものとなる。   The mixing ratio of the bleached cotton fiber and the thermoplastic short fiber in the nonwoven fabric may be appropriately selected within the range of 30/70 to 70/30 (mass ratio) of bleached cotton fiber / thermoplastic short fiber. When the blending ratio of the bleached cotton fibers increases, the feeling of good touch becomes excellent. On the other hand, when the blending ratio of the thermoplastic short fibers increases, the content of hydrophobic fibers increases, so that the liquid permeability is more excellent. It will be a thing.

不織布は、上記漂白綿繊維と熱可塑性短繊維とから構成され、構成繊維同士が三次元的に交絡している。構成繊維同士が、三次元的に交絡することにより、肌触りの良好な不織布となる。繊維同士を三次元的に交絡させるための手段としては、高圧水流処理が好ましい。高圧水流処理により三次元的に交絡してなる不織布は柔軟性、ドレープ性に優れるためである。また、不織布は、開孔を有するものが好ましい。吸収した体液が、開孔を通じて、速やかに表面シートの下の吸収層へ移行させることができる。個々の開孔の大きさは0.5〜15mm2であることが好ましく、また、開孔の存在密度は、1〜100個/cm2であることが好ましい。 A nonwoven fabric is comprised from the said bleached cotton fiber and a thermoplastic short fiber, and the constituent fibers are entangled three-dimensionally. When the constituent fibers are entangled three-dimensionally, it becomes a non-woven fabric with good touch. As a means for entanglement of fibers in a three-dimensional manner, high-pressure water flow treatment is preferable. This is because a nonwoven fabric entangled three-dimensionally by high-pressure water flow treatment is excellent in flexibility and drape. Moreover, what has an aperture is preferable for a nonwoven fabric. The absorbed body fluid can be quickly transferred to the absorption layer under the surface sheet through the opening. The size of each aperture is preferably 0.5 to 15 mm 2 , and the density of apertures is preferably 1 to 100 holes / cm 2 .

不織布には、親油性グリセリン脂肪酸エステルが付着している。親油性グリセリン脂肪酸エステルは、乳化作用、分散作用があるとして、美容液や乳液等の化粧剤に多く使用されているものである。本発明においては、新油型グリセリン脂肪酸エステルの中でも、親油性モノステアリン酸グリセリルあるいは親油性モノオレイン酸グリセリルを用いるとよい。   Lipophilic glycerin fatty acid ester adheres to the nonwoven fabric. Lipophilic glycerin fatty acid ester has many emulsifying and dispersing actions, and is often used in cosmetics such as cosmetic liquids and emulsions. In the present invention, among the new oil type glycerin fatty acid esters, lipophilic glyceryl monostearate or lipophilic glyceryl monooleate may be used.

本発明の吸収性物品の表面シートは、親油性グリセリン脂肪酸エステルが付着していることによって、体液の吸収・移行性がより向上し、また、液戻り性が良好なものとなる。このような効果を良好に奏するために、シートにおける親油性グリセリン脂肪酸エステルの付着量は0.1〜1wt%であることが好ましい。   Since the lipophilic glycerin fatty acid ester is adhered to the surface sheet of the absorbent article of the present invention, the absorption and migration of body fluids are further improved, and the liquid returnability is good. In order to exhibit such an effect satisfactorily, the adhesion amount of the lipophilic glycerin fatty acid ester in the sheet is preferably 0.1 to 1 wt%.

不織布の目付は、適宜選択すればよいが、実用的な強力を有する範囲において、体液が素早く移行しやすいように薄い方が好ましく10〜40g/m2程度がよい。 The basis weight of the nonwoven fabric may be selected as appropriate, but it is preferably as thin as about 10 to 40 g / m 2 so that the body fluid is easily transferred within a practically strong range.

本発明の吸収性物品の表面シートは、上記の構成を有するものであり、まず、シート表面への体液を素早く通過させることができる。体液を素早く通過させることができる指標となる保水量は、本発明においては、0.2g以下であることが好ましく、より好ましくは0.15g以下である。保水量は、下記の方法により測定される。すなわち、縦10cm、横10cmの試料片を作成し、試料の乾燥質量を測定する。次に、濾紙を5枚重ねたものの上にセカンドシート(サーマルボンド不織布)を1枚置き、さらにその上に試料を1枚置く。37℃に温めた人工経血を3ccを試料中央に滴下し、5分間放置した後、試料の質量を測定し、試料の質量増加分(人工経血の吸収分)を下式より算出する。
保水量(g)=(人工経血を吸収させた試料質量)−(試料の乾燥質量)
The surface sheet of the absorbent article of the present invention has the above-described configuration, and first, body fluid can be quickly passed through the sheet surface. In the present invention, the water retention amount serving as an index that allows body fluid to pass through quickly is preferably 0.2 g or less, and more preferably 0.15 g or less. The water retention amount is measured by the following method. That is, a 10 cm long and 10 cm wide sample piece is prepared, and the dry mass of the sample is measured. Next, a second sheet (thermal bond nonwoven fabric) is placed on a stack of five filter papers, and a sample is placed thereon. 3 cc of artificial menstrual blood warmed to 37 ° C. is dropped on the center of the sample and left for 5 minutes, and then the mass of the sample is measured, and the increase in mass of the sample (absorbed amount of artificial menstrual blood) is calculated from the following equation.
Water retention amount (g) = (mass of sample absorbed artificial menstrual blood) − (dry mass of sample)

本発明の表面シートは、例えば、以下の方法で得ることができる。まず、天然油脂が付着した漂白綿繊維と、少なくとも繊維表面がポリオレフィン系重合体からなる熱可塑性短繊維とを混合したウェブを準備する。そして、該ウェブをメッシュ状支持体に担持する。メッシュ状支持体としては、不織布に開孔を付与することが好ましいので所定の目開きを持った粗目織物からなるメッシュ状支持体を用いるとよい。また、メッシュ状支持体の織目模様を適宜選択することによって、不織布に任意の模様を付与することもできる。ウェブをメッシュ上支持体に担持した後、ウェブ側から高圧水流を施し、構成繊維同士を三次元的に交絡させて一体化した不織布を得る。この高圧水流は、孔径0.05〜2.0mmの噴射孔が、噴射孔間隔0.05〜10mmで一列又は複数列配置されている噴射装置を用い、水を噴射孔から1.5〜40MPaの圧力で噴射して得られるものである。そうすると、高圧水流はウェブに衝突して、構成繊維に運動エネルギーを与える。この運動エネルギーにより、構成繊維は、相互に交絡する。また、粗目織物からなるメッシュ状支持体を用いた場合は、構成繊維が交絡しながら、メッシュ状支持体の開孔部分へ移動し、支持体のナックル部に対応した箇所には繊維が存在せず開孔が形成され、開孔を有する不織布を得ることができる。   The surface sheet of the present invention can be obtained, for example, by the following method. First, a web is prepared by mixing bleached cotton fibers to which natural fats and oils are adhered and thermoplastic short fibers having at least a fiber surface made of a polyolefin polymer. Then, the web is supported on a mesh-like support. As the mesh-like support, it is preferable to use a mesh-like support made of a coarse woven fabric having a predetermined opening because it is preferable to provide openings in the nonwoven fabric. Moreover, an arbitrary pattern can also be given to a nonwoven fabric by selecting suitably the texture pattern of a mesh-shaped support body. After the web is supported on the mesh support, a high-pressure water flow is applied from the web side, and the constituent fibers are entangled three-dimensionally to obtain an integrated nonwoven fabric. This high-pressure water flow uses an injection device in which injection holes with a hole diameter of 0.05 to 2.0 mm are arranged in one or more rows with an injection hole interval of 0.05 to 10 mm, and water is supplied from the injection holes to 1.5 to 40 MPa. It is obtained by spraying at a pressure of The high pressure water stream then impinges on the web and imparts kinetic energy to the constituent fibers. Due to this kinetic energy, the constituent fibers are entangled with each other. In addition, when a mesh-like support made of a coarse woven fabric is used, the constituent fibers move to the opening portion of the mesh-like support while being entangled, and there are no fibers at the location corresponding to the knuckle portion of the support. A non-woven fabric having open holes can be obtained.

メッシュ状支持体の目開きは、得ようとする不織布の表面形態、開孔の有無に基づいて決定することができる。20メッシュ以下の粗目織物を用いることにより、不織布に明瞭な開孔を形成させることができ、15メッシュ以下の粗目織物を用いると、ウェブの構成繊維がメッシュ状支持体の開孔部により移動しやすくなり、効果的に開孔を形成することができるため、より体液を素早く透過させることができる。体液が素早く透過すること、肌への接触点が小さいこと等を考慮すると、メッシュ状支持体が6〜10メッシュの粗目織物を用いることが好ましい。なお、6メッシュ未満であると、開孔が大きくなりすぎて、吸収性物品を製造する際にシートの取り扱い性に劣る傾向となる。ここで、メッシュとは、1インチ当たりの線の数を指し、例えば25メッシュの粗目織物は、1インチ当たり25本の線が存在するものを指す。   The mesh support can be determined based on the surface form of the nonwoven fabric to be obtained and the presence or absence of openings. By using a coarse woven fabric of 20 mesh or less, a clear opening can be formed in the nonwoven fabric. When a coarse woven fabric of 15 mesh or less is used, the constituent fibers of the web are moved by the openings of the mesh support. Since it becomes easy and an opening can be formed effectively, a bodily fluid can be permeate | transmitted more rapidly. Considering that the body fluid permeates quickly and that the contact point with the skin is small, it is preferable to use a coarse woven fabric having a mesh-like support of 6 to 10 mesh. In addition, when it is less than 6 meshes, the opening becomes too large, and when the absorbent article is manufactured, the handling property of the sheet tends to be inferior. Here, the mesh refers to the number of lines per inch. For example, a 25-mesh coarse woven fabric refers to one having 25 lines per inch.

高圧水流を施して構成繊維同士が交絡してなる不織布が含む水分を除去して、不織布を得る。次いで、所定量の親油性グリセリン脂肪酸エステルを不織布に付着させる。付着する方法としては、親油性グリセリン脂肪酸エステルのエマルジョン溶液を、不織布に噴霧、含浸、キスコート等により付着させるとよい。エマルジョン溶液を付着させた後は、乾燥処理を施して、所定量の親油性グリセリン脂肪酸エステルが付着させることができる。また、高圧水流処理後の水分を含む不織布をマングルロールに通して、余剰水分を除去し、その後、適宜の方法で親油性グリセリン脂肪酸エステルびエマルジョン溶液を付着させることにより、高圧水流と親油性グリセリン脂肪酸エステルの付与工程を連続工程で効率的に行うことができる。   A non-woven fabric is obtained by removing water contained in a non-woven fabric formed by entanglement of constituent fibers by applying a high-pressure water flow. A predetermined amount of lipophilic glycerin fatty acid ester is then adhered to the nonwoven fabric. As a method for adhesion, an emulsion solution of a lipophilic glycerin fatty acid ester may be adhered to the nonwoven fabric by spraying, impregnation, kiss coating or the like. After adhering the emulsion solution, a predetermined amount of lipophilic glycerin fatty acid ester can be adhered by drying treatment. Further, the high-pressure water stream and the lipophilic glycerin can be obtained by passing the non-woven fabric containing water after the high-pressure water stream treatment through a mangle roll to remove excess water, and then attaching the lipophilic glycerin fatty acid ester emulsion solution by an appropriate method. The application step of the fatty acid ester can be efficiently performed in a continuous process.

本発明の吸収性物品の表面シートは、天然油脂が付着した漂白綿繊維と、少なくとも繊維表面がポリオレフィン系重合体からなる熱可塑性短繊維とを構成繊維とし、さらに新油性グリセリン脂肪酸エステルが付着していることから、体液を素早く通過させることができ、表面の濡れ感による不快感が発生しにくい。   The surface sheet of the absorbent article of the present invention is composed of bleached cotton fibers to which natural oils and fats are attached and thermoplastic short fibers having at least the fiber surface made of a polyolefin-based polymer, and further includes a new oily glycerin fatty acid ester. Therefore, bodily fluids can be passed quickly, and discomfort due to the wetness of the surface is less likely to occur.

(1)目付(g/m):標準状態の試料から、縦10cm×横10cmの試料片を10点作成し、各試料片の質量(g)を秤量し、得られた値の平均値を単位面積あたりに換算して、目付(g/m)とした。 (1) Weight per unit area (g / m 2 ): Ten sample pieces each having a length of 10 cm and a width of 10 cm were prepared from a sample in a standard state, the mass (g) of each sample piece was weighed, and the average value of the obtained values Was converted to a unit area (g / m 2 ).

(2)引張強力(N/5cm幅):JIS−L−1906に準じて測定した。試料長が20cm、試料幅が5cmの試料片を不織布のタテ方向およびヨコ方向について、各10点を作成し、定速伸長型引張試験機(オリエンテック社製、テンシロンUTM−4−100)を用いて、つかみ間隔10cm、引張速度10cm/分で伸長し、最大荷重時の強さを測定し、その平均値を引張強力(N/5cm幅)とした。 (2) Tensile strength (N / 5 cm width): Measured according to JIS-L-1906. A sample piece having a sample length of 20 cm and a sample width of 5 cm was prepared for each of 10 points in the vertical direction and the horizontal direction of the nonwoven fabric, and a constant-speed extension type tensile tester (manufactured by Orientec Corporation, Tensilon UTM-4-100) was used. It was used and stretched at a grip interval of 10 cm and a tensile speed of 10 cm / min, the strength at the maximum load was measured, and the average value was taken as the tensile strength (N / 5 cm width).

(3)保水性:縦10cm、横10cmの試料片を作成し、試料の乾燥質量を測定し、次に、濾紙を5枚重ねたものの上にセカンドシート(サーマルボンド不織布)を1枚置き、さらにその上に試料を1枚置き、37℃に温めた人工経血を3ccを試料中央に滴下し、5分間放置した後、試料の質量を測定し、試料の質量増加分(人工経血の吸収分)を下式より算出した。なお、保水量は、試料3枚の平均値とした。
保水量(g)=(人工経血を吸収させた試料質量)−(試料の乾燥質量)
(3) Water retention: A sample piece of 10 cm in length and 10 cm in width is prepared, the dry mass of the sample is measured, and then a second sheet (thermal bond nonwoven fabric) is placed on a stack of five filter papers, Furthermore, a sample was placed thereon, 3 cc of artificial menstrual blood warmed to 37 ° C. was dropped on the center of the sample and left for 5 minutes, and then the mass of the sample was measured. Absorption) was calculated from the following equation. The water retention amount was the average value of three samples.
Water retention amount (g) = (mass of sample absorbed artificial menstrual blood) − (dry mass of sample)

(4)表面の濡れ感:上記載の保水性を評価した試料について、試料表面に指で触れて濡れ感を評価した。 (4) Surface wetting feeling: For the samples evaluated for water retention, the wetting feeling was evaluated by touching the sample surface with a finger.

実施例1
天然油脂が0.4質量%付着した漂白綿繊維(丸三産業社製)50質量%と、熱可塑性短繊維として、鞘部にポリエチレン(融点:130℃)、芯部にポリエチレンテレフタレート(融点:256℃)が配された芯鞘複合短繊維(ユニチカファイバー社製<6080>繊度2.0デシテックス、繊維長44mm、撥水性油剤付与)50質量%とを、均一に混合し、カード機に供給し混合ウエブを得た。次いで、この混合ウエブを、移動する10メッシュのプラスチック製織物からなる支持体に担持し、混合ウエブ側より高圧水流を施した。高圧水流は、支持体の上方50mmに位置した孔径0.1mmの噴射孔が孔間隔0.6mmで1列に配置され、かつその列を三列備えた高圧水流噴射装置を用い、各々10MPa圧力で水を噴射したものである。高圧水流を施すことにより混合ウエブの構成繊維同士を三次元的に交絡させて一体化させた。次いで、一体化させた不織布より余剰の水分をマングルロールにて除去した後、親油性モノステアリン酸グリセリルのエマルジョン溶液を、キスコーターを用いて付着させた。その際、不織布に付着する親油性モノステアリン酸グリセリルの固形分付着量が0.3質量%となるよう付着させた。その後、温度120℃の乾燥機で乾燥した。そして、目付30g/m、約4.2mmの大きさの開孔が存在密度11個/cmで付与された吸収性物品の表面シートを得た。
Example 1
50% by mass of bleached cotton fiber (manufactured by Marusan Sangyo Co., Ltd.) with 0.4% by mass of natural fats and oils, polyethylene as the sheath (melting point: 130 ° C.) and polyethylene terephthalate (melting point: 256) as the core 50% by mass with a core-sheath composite short fiber (Unitica Fiber Co., Ltd. <6080> fineness 2.0 decitex, fiber length 44 mm, water-repellent oil added) supplied to a card machine. A mixed web was obtained. Next, the mixed web was supported on a moving support made of a 10-mesh plastic fabric, and a high-pressure water flow was applied from the mixed web side. The high-pressure water flow uses a high-pressure water jet device in which injection holes with a hole diameter of 0.1 mm located 50 mm above the support are arranged in one row with a hole interval of 0.6 mm, and each of the rows is provided with three rows, and each pressure is 10 MPa. The water is jetted in. By applying a high-pressure water stream, the constituent fibers of the mixed web were three-dimensionally entangled and integrated. Next, after removing excess moisture from the integrated nonwoven fabric with mangle roll, an emulsion solution of lipophilic glyceryl monostearate was attached using a kiss coater. In that case, it was made to adhere so that the solid content adhesion amount of lipophilic glyceryl monostearate adhering to a nonwoven fabric might be 0.3 mass%. Then, it dried with the dryer of temperature 120 degreeC. The basis weight 30 g / m 2, to obtain a surface sheet of about 4.2 mm 2 in size of the absorbent article apertures is granted by the density 11 / cm 2.

実施例2
実施例1において、親油性モノステアリン酸グリセリルの固形分付着量が0.5質量%となるように、キスコーターを用いて親油性モノステアリン酸グリセリルのエマルジョン溶液を付着させたこと以外は、実施例1と同様にして吸収性物品の表面シートを得た。
Example 2
In Example 1, except that the emulsion solution of lipophilic glyceryl monostearate was adhered using a kiss coater so that the solid content adhesion amount of lipophilic glyceryl monostearate was 0.5% by mass. In the same manner as in No. 1, a surface sheet of an absorbent article was obtained.

実施例3
実施例1において、高圧水流を付与する際、6メッシュのプラスチック製織物からなる支持体を用いたこと、高圧水流噴射装置におけるそれぞれの噴射孔から11MPa圧力の水を噴射したこと以外は、実施例1と同様にして吸収性物品の表面シートを得た。得られた表面シートには、約12.4mmの大きさの開孔が存在密度2個/cmで付与されていた。
Example 3
In Example 1, when a high pressure water flow was applied, a support made of a 6-mesh plastic fabric was used, and water of 11 MPa pressure was injected from each injection hole in the high pressure water flow injection device. In the same manner as in No. 1, a surface sheet of an absorbent article was obtained. The obtained surface sheet was provided with openings having a size of about 12.4 mm 2 at a density of 2 / cm 2 .

実施例4
実施例1において、漂白綿繊維と熱可塑性短繊維との混合比率を漂白綿繊維/熱可塑性短繊維=30/70としたこと以外は、実施例1と同様にして吸収性物品の表面シートを得た。
Example 4
In Example 1, the surface sheet of the absorbent article was prepared in the same manner as in Example 1 except that the mixing ratio of the bleached cotton fiber and the thermoplastic short fiber was set to bleached cotton fiber / thermoplastic short fiber = 30/70. Obtained.

比較例1
実施例1において、親油性モノステアリン酸グリセリルを付着しなかったこと以外は実施例1と同様にしてシートを得た。
Comparative Example 1
A sheet was obtained in the same manner as in Example 1 except that lipophilic glyceryl monostearate was not adhered.

得られた実施例1〜4のシートおよび比較例1のシートの評価結果を表1に示す。   Table 1 shows the evaluation results of the obtained sheets of Examples 1 to 4 and Comparative Example 1.

表1からも明らかなように、実施例1〜4の表面シートは、比較例1のシートと比較し、保水量を大幅に少なくすることができ、表面に滴下した体液を素早く通過できることがわかる。また、実施例1〜4のいずれについても、評価した3枚のシートについて全て表面の濡れ感がなく、吸収性物品の表面シートとして良好に使用できるものであった。
As is clear from Table 1, the surface sheets of Examples 1 to 4 can significantly reduce the amount of water retained compared to the sheet of Comparative Example 1, and can quickly pass the body fluid dripped onto the surface. . Moreover, about any of Examples 1-4, there was no surface wet feeling about all the evaluated 3 sheets, and it could be used favorably as a surface sheet of an absorbent article.

Claims (4)

天然油脂が付着した漂白綿繊維と、少なくとも繊維表面がオレフィン系重合体からなる熱可塑性短繊維とにより構成され、構成繊維同士が三次元的に交絡してなる不織布であり、不織布には親油性グリセリン脂肪酸エステルが付着しており、該不織布によって構成されることを特徴とする吸収性物品の表面シート。   It is a non-woven fabric composed of bleached cotton fibers with natural fats and oils and at least a thermoplastic short fiber made of an olefin polymer on the fiber surface. A surface sheet of an absorbent article, characterized in that a glycerin fatty acid ester is attached and is constituted by the nonwoven fabric. 親油性グリセリン脂肪酸エステルが、親油性モノステアリン酸グリセリルあるいは親油性モノオレイン酸グリセリルのいずれかであることを特徴とする請求項1記載の吸収性物品の表面シート。   The top sheet of an absorbent article according to claim 1, wherein the lipophilic glycerin fatty acid ester is either lipophilic glyceryl monostearate or lipophilic glyceryl monooleate. 親油性グリセリン脂肪酸エステルの付着量が0.1wt%〜1wt%であることを特徴とする請求項1または2記載の吸収性物品の表面シート。   The surface sheet of an absorbent article according to claim 1 or 2, wherein the adhesion amount of the lipophilic glycerin fatty acid ester is 0.1 wt% to 1 wt%. 保水量が0.2g以下であることを特徴とする請求項1から3のいずれか1項記載の吸収性物品の表面シート。
The surface sheet of an absorbent article according to any one of claims 1 to 3, wherein the water retention amount is 0.2 g or less.
JP2009182451A 2009-08-05 2009-08-05 Surface sheet of absorbent article Pending JP2011030940A (en)

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