JP6285737B2 - Non-woven fabric for wet sheet, wet wiping sheet, and liquid-impregnated skin coating sheet - Google Patents
Non-woven fabric for wet sheet, wet wiping sheet, and liquid-impregnated skin coating sheet Download PDFInfo
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Landscapes
- Cosmetics (AREA)
- Nonwoven Fabrics (AREA)
Description
本発明は、液体、特に化粧料を含浸させたウェットシートを構成する不織布、および当該不織布を用いたウェットワイピングシート、および液体含浸皮膚被覆シートに関する。 The present invention relates to a nonwoven fabric constituting a wet sheet impregnated with a liquid, particularly a cosmetic, a wet wiping sheet using the nonwoven fabric, and a liquid-impregnated skin-covering sheet.
人体の皮膚から所定の物質を取り除く、または人体の皮膚に所定の物質を付与するために用いられる、液体を含浸させたシートが種々提案され、実用されている。具体的には、クレンジング剤を含浸させたメイク落としシート、制汗剤を含浸させた制汗シート、有効成分を含む液体（例えば化粧料）を含浸させた液体含浸皮膚被覆シート（フェイスマスクや踵、肘、膝などに使用する角質ケアシート）等が挙げられる。液体を含浸させたシート（以下、「ウェットシート」とも呼ぶ）の基材としては、不織布が一般的に用いられている。ウェットシートは、人体の皮膚にあてて使用することが多いため、基材として、触感、利便性、および液体の放出性等の点から、様々な不織布が基材として提案されている。 Various sheets impregnated with a liquid used for removing a predetermined substance from the human skin or applying the predetermined substance to the human skin have been proposed and put into practical use. Specifically, a makeup remover sheet impregnated with a cleansing agent, an antiperspirant sheet impregnated with an antiperspirant, and a liquid-impregnated skin-coated sheet impregnated with a liquid containing an active ingredient (for example, cosmetics) , Keratin care sheets used for elbows, knees, etc.). As a base material of a sheet impregnated with a liquid (hereinafter also referred to as “wet sheet”), a nonwoven fabric is generally used. Since wet sheets are often used by being applied to human skin, various non-woven fabrics have been proposed as base materials from the viewpoints of touch, convenience, and liquid release properties.
例えば、特許文献１は、親水性繊維を対人接触面に４０〜６０重量％露出するように配置し、且つポリエステル繊維を５０〜２０重量％、熱接着性繊維を１０〜２０重量％含有し、繊維ウェブを三次元的に交絡させた、対人向けワイパー用不織布を提案している。特許文献１には、熱接着性繊維を熱接着させることにより、不織布の毛羽立ちを抑制できることが記載されている。特許文献２は、親水性層の少なくとも一方の面に極細繊維層を積層し、一体化させた化粧料含浸皮膚被覆シートを提案している。特許文献３は、分割可能な複合繊維と、親水性繊維が混綿され水流交絡された不織布からなる化粧料含浸用皮膚被覆シートであって、複合繊維が部分的に分割され、繊度０．６dtex以下のポリエチレン極細繊維を含むシートを提案している。 For example, Patent Document 1 arranges hydrophilic fibers so as to be exposed to 40 to 60% by weight on the human contact surface, and contains 50 to 20% by weight of polyester fiber and 10 to 20% by weight of heat-adhesive fiber, We have proposed non-woven fabrics for interpersonal wipers, in which a fibrous web is entangled three-dimensionally. Patent Document 1 describes that fuzz of a nonwoven fabric can be suppressed by thermally bonding a heat-bondable fiber. Patent Document 2 proposes a cosmetic-impregnated skin-covering sheet in which an ultrafine fiber layer is laminated and integrated on at least one surface of a hydrophilic layer. Patent Document 3 is a skin-covering sheet for impregnating a cosmetic material comprising a splittable composite fiber and a nonwoven fabric in which hydrophilic fibers are mixed and hydroentangled. The composite fiber is partially divided and has a fineness of 0.6 dtex or less. A sheet containing polyethylene microfibers is proposed.
ウェットシートの用途および形態は多様化が進んでいる。例えば、液体化粧料を含浸させたフェイスマスクに関しては、マスクを１枚ずつ個別に包装した商品もあれば、複数枚のマスクを一つの包装袋に入れた商品もある。複数枚のマスクを一つの包装袋に入れる商品においては、一つの包装袋により多くのマスクを収容することが求められる場合がある。その場合には、マスクの基材をできるだけ薄くする、具体的には、基材である不織布の目付および厚みを小さくする必要がある。 The use and form of wet sheets are diversifying. For example, with respect to a face mask impregnated with a liquid cosmetic, there are products in which the masks are individually packaged one by one, and products in which a plurality of masks are put in one packaging bag. In a product in which a plurality of masks are put in one packaging bag, it may be required to store a large number of masks in one packaging bag. In that case, it is necessary to make the base material of the mask as thin as possible, specifically, the basis weight and thickness of the nonwoven fabric as the base material.
不織布の目付および厚みを小さくすると、弾性（コシ）がなくなりやすい。フェイスマスクや角質ケアシートなどの液体含浸皮膚被覆シートは、一般的に使用される部位（例えば、顔面、首から胸元にかけての部位（デコルテと呼ばれる）、踵）の形状に合うようにするため、不織布などの基材に、切り込み、切り欠き（例えば、基材の外縁部の一部から、半円、台形、三角形等を切り取って形成される）、打ち抜き加工による開口部を設けて、複数回折り畳まれた状態で提供される。コシのない不織布を用いると、液体（例えば、化粧料）を含浸していることに加え、不織布に設けた切り込み、打ち抜きによる開口部なども影響して、折り畳まれた状態からシートを広げることが難しくなる。また、不織布は、その目付および厚みが小さくなると、その他の構成が同じである限りにおいて、強度が低下し、小さな力でもより伸びやすくなる。 If the basis weight and thickness of the nonwoven fabric are reduced, elasticity (elasticity) tends to be lost. Liquid-impregnated skin-covering sheets such as face masks and keratin care sheets are designed to fit the shape of commonly used parts (for example, the face, the part from the neck to the chest (called decollete), the heel) A base material such as non-woven fabric is cut, cut out (for example, formed by cutting a semicircle, a trapezoid, a triangle, etc. from a part of the outer edge of the base material), and an opening by punching is provided multiple times. Offered in a folded state. If a non-woven fabric is used, in addition to being impregnated with a liquid (for example, cosmetics), the sheet may be expanded from a folded state due to the effect of notching and punching openings provided in the nonwoven fabric. It becomes difficult. Moreover, as long as the basis weight and thickness of the nonwoven fabric are reduced, as long as other configurations are the same, the strength is reduced and the nonwoven fabric is more easily stretched even with a small force.
強度の低下を防止する手法としては、特許文献１に記載されているように、熱接着性繊維を用いて、繊維同士を熱接着させることが考えられる。しかしながら、特許文献１に記載された構成の不織布を採用してもなお、不織布に液体を含浸させて、複数回折り畳まれた状態とすると、折り畳まれた状態から不織布を広げにくく、広げるときに不織布においてのびが生じやすくなることがわかった。 As a technique for preventing a decrease in strength, as described in Patent Document 1, it is conceivable to thermally bond the fibers to each other using a heat-bondable fiber. However, even if the nonwoven fabric having the configuration described in Patent Document 1 is adopted, it is difficult to spread the nonwoven fabric from the folded state when the nonwoven fabric is impregnated with a liquid and folded into a plurality of shapes. It has been found that the spread tends to occur.
本発明は、目付が小さいにもかかわらず、液体を含浸した状態にて、複数回折り畳まれた場合でも、折り畳まれた状態から容易に広げることができ、かつ広げるときに伸びが生じにくいとともに、柔軟性に富んだ不織布を提供することを目的とする。 Although the present invention has a small basis weight and is impregnated with a liquid, even when folded several times, it can be easily expanded from the folded state, and it is difficult to stretch when expanded, It aims at providing the nonwoven fabric rich in a softness | flexibility.
本発明は、液体を含浸させたウェットシートの基材として用いる不織布であって、
３２g/m2以上、５０g/m2以下の目付を有し、
２以上の成分から成る分割型複合繊維に由来する繊維、親水性繊維、および繊度０．８dtex以上の合成繊維（以下、「太繊度合成繊維」）を含む単層構造を有し、
前記分割型複合繊維に由来する繊維、前記親水性繊維、および前記太繊度合成繊維を合わせた質量を１００質量％としたときに、前記分割型複合繊維に由来する繊維を２２質量％以上、３８質量％以下、前記親水性繊維を２０質量％以上、５３質量％以下、および前記太繊度合成繊維を２２質量％以上、５８質量％以下含み、
前記分割型複合繊維は、融点が１４０℃以下の熱可塑性樹脂の成分（以下、「低融点成分」）と、融点が１４０℃を超える熱可塑性樹脂の成分（以下、「高融点成分」）の少なくとも二つの成分を含み、
前記太繊度合成繊維は、融点が１４０℃を超える熱可塑性樹脂で繊維表面が構成されており、
前記分割型複合繊維に由来する繊維として、前記低融点成分からなる繊度０．６dtex以下の極細繊維、および前記高融点成分からなる繊度０．６dtex以下の極細繊維を含み、
構成繊維の交点の少なくとも一部が、前記低融点成分からなる極細繊維によって熱接着されている、
不織布である。
The present invention is a nonwoven fabric used as a base material for a wet sheet impregnated with a liquid,
Having a basis weight of 32 g / m 2 or more and 50 g / m 2 or less,
Having a single-layer structure including a fiber derived from a split-type composite fiber composed of two or more components, a hydrophilic fiber, and a synthetic fiber having a fineness of 0.8 dtex or more (hereinafter referred to as “thick fine synthetic fiber”);
When the mass of the fiber derived from the split-type conjugate fiber, the hydrophilic fiber, and the thick synthetic fiber is 100% by mass, the fiber derived from the split-type conjugate fiber is 22% by mass or more, 38 % By mass or less, 20% by mass or more and 53% by mass or less of the hydrophilic fiber, and 22% by mass or more and 58% by mass or less of the synthetic fiber having the above-mentioned fineness,
The split type composite fiber is composed of a thermoplastic resin component having a melting point of 140 ° C. or lower (hereinafter, “low melting component”) and a thermoplastic resin component having a melting point exceeding 140 ° C. (hereinafter, “high melting component”). Contains at least two ingredients,
The thick fine synthetic fiber has a fiber surface made of a thermoplastic resin having a melting point exceeding 140 ° C.,
As fibers derived from the split-type composite fiber, including ultrafine fibers having a fineness of 0.6 dtex or less consisting of the low melting point component, and ultrafine fibers having a fineness of 0.6 dtex or less consisting of the high melting point component,
At least some of the intersections of the constituent fibers are thermally bonded by the ultrafine fibers made of the low melting point component,
It is a nonwoven fabric.
本発明はまた、前記不織布を基材とし、前記基材１００質量部に対して、液体が１００質量部以上、１０００質量部以下の範囲内にある割合で含浸されている、対人用ウェットワイピングシートを提供する。 The present invention also uses the nonwoven fabric as a base material, and the wet wipe sheet for personal use is impregnated at a ratio of 100 parts by mass or more and 1000 parts by mass or less with respect to 100 parts by mass of the base material. I will provide a.
本発明はまた、前記不織布を基材とし、前記基材１００質量部に対して、液体が１５０質量部以上、２５００質量部以下の範囲内にある割合で含浸されている、対人用液体含浸皮膚被覆シートを提供する。 The present invention also provides a human-impregnated liquid-impregnated skin, wherein the nonwoven fabric is used as a base material, and the liquid is impregnated at a ratio of 150 parts by mass or more and 2500 parts by mass or less with respect to 100 parts by mass of the base material. A coated sheet is provided.
本発明のウェットシート用不織布は、分割型複合繊維に由来する繊維、親水性繊維、太繊度合成繊維を所定の割合で含み、かつ分割型複合繊維に由来する極細繊維によって繊維同士の交点の少なくとも一部が熱接着された、目付が５０g/m2以下の不織布である。三種類の繊維が所定の割合で含まれることにより、不織布は柔軟性および液体保持性に優れるとともに、薄いにもかかわらず、液体が含浸させられて折り畳まれた状態から容易に広げることができ、かつ伸びが生じにくくなる。よって、本発明によれば、多数枚のシートを折り畳んで一つの包装袋に入れて提供する商品に適した、薄いウェットシート、特に、折り畳まれた状態から完全に展開することが使用時において必須である対人用液体含浸皮膚被覆シートが得られる。 The nonwoven fabric for wet sheets of the present invention includes fibers derived from split-type conjugate fibers, hydrophilic fibers, and thick synthetic fibers at a predetermined ratio, and at least at the intersection of the fibers by ultrafine fibers derived from the split-type conjugate fibers. A non-woven fabric with a basis weight of 50 g / m 2 or less, partly heat-bonded. By including three kinds of fibers at a predetermined ratio, the nonwoven fabric is excellent in flexibility and liquid retention, and can be easily spread from a state where it is impregnated with liquid, even though it is thin, And it becomes difficult to produce elongation. Therefore, according to the present invention, a thin wet sheet suitable for a product provided by folding a large number of sheets into a single packaging bag, in particular, it is essential at the time of use to completely unfold the sheet. The interpersonal liquid-impregnated skin-covering sheet is obtained.
本発明の不織布は、分割型複合繊維に由来する繊維、親水性繊維、および太繊度合成繊維を含む。そこで、これらの繊維についてまず説明する。 The nonwoven fabric of the present invention includes fibers derived from split-type composite fibers, hydrophilic fibers, and thick synthetic fibers. Therefore, these fibers will be described first.
［分割型複合繊維に由来する繊維］
分割型複合繊維は、２以上の成分からなる複合繊維であって、分割により１本の繊維から複数本のより繊度の小さい繊維を形成し得る繊維である。「分割型複合繊維に由来する繊維」とは、分割型複合繊維の分割により形成された、分割前の一つのセクションのみからなる単一繊維、および２以上のセクションからなる繊維のほか、１本の分割型複合繊維の一部が分割されているが、他の部分において全く分割していない繊維を指す。あるいは、不織布中に分割型複合繊維の分割により形成された繊維が含まれる限りにおいて、１本の分割型複合繊維が全く分割されていないことがある場合に、そのような全く分割されていない分割型複合繊維も、分割型複合繊維に由来する繊維に含まれる。
[Fibers derived from split type composite fibers]
The split type composite fiber is a composite fiber composed of two or more components, and can form a plurality of fibers having smaller fineness from one fiber by splitting. “Fiber derived from split type composite fiber” means a single fiber formed by splitting a split type composite fiber consisting of only one section before splitting, a fiber consisting of two or more sections, and one fiber A part of the split type composite fiber is divided, but the other part is not split at all. Alternatively, as long as one non-divided composite fiber may not be divided at all as long as the nonwoven fabric includes fibers formed by dividing the divided composite fiber, such a non-divided division The type composite fiber is also included in the fiber derived from the split type composite fiber.
分割型複合繊維は、具体的には、繊維断面において構成成分のうち少なくとも１成分が２個以上に区分されてなり、構成成分の少なくとも一部が繊維表面に露出し、その露出部分が繊維の長さ方向に連続的に形成されている繊維断面構造を有する。本発明で用いる分割型複合繊維は２以上の成分で構成され、かつ、当該２以上の成分のうち、一つの成分は融点が１４０℃以下の熱可塑性樹脂の成分（「低融点成分」）であり、別の一つの成分は、融点が１４０℃を超える熱可塑性樹脂の成分（「高融点成分」）である。ここで、融点は、繊維にした後の樹脂の融点であり、ＪＩＳ Ｋ７１２１（１９８７）に準じて測定したＤＳＣ曲線より求める。低融点成分は繊維同士を接着させる役割をするので、熱接着成分と呼ぶこともできる。本発明においては、分割型複合繊維の１成分を低融点成分とし、低融点成分からなる極細繊維で繊維同士の交点の少なくとも一部を接着させる。それにより、不織布はその取り扱い性が向上し、また、伸びにくくなるので、液体を含浸させて折り畳まれた状態から展開しやすくなり、また、折り畳まれた状態から展開した際に生じる不織布の伸び、即ち、変形度合いを小さくできる。高融点成分は、低融点成分と十分な融点差、好ましくは１０℃以上の融点差、より好ましくは１５℃以上の融点差を有し、低融点成分を溶融する温度で熱により変形等しないものであることが好ましい。 Specifically, the split-type conjugate fiber is formed by dividing at least one component of the constituent components into two or more in the fiber cross section, and at least a part of the constituent components are exposed on the fiber surface, and the exposed portion is the fiber. It has a fiber cross-sectional structure formed continuously in the length direction. The split type composite fiber used in the present invention is composed of two or more components, and one of the two or more components is a component of a thermoplastic resin having a melting point of 140 ° C. or less (“low melting point component”). One other component is a component of a thermoplastic resin having a melting point exceeding 140 ° C. (“high melting point component”). Here, melting | fusing point is melting | fusing point of resin after making it into a fiber, and calculates | requires from the DSC curve measured according to JISK7121 (1987). Since the low melting point component serves to bond the fibers together, it can also be called a thermal bonding component. In the present invention, one component of the split-type composite fiber is used as a low melting point component, and at least a part of the intersections of the fibers are bonded with ultrafine fibers composed of the low melting point component. Thereby, the non-woven fabric has improved handleability and is difficult to stretch, so that it is easy to expand from the folded state by impregnating the liquid, and the stretch of the nonwoven fabric that occurs when expanded from the folded state, That is, the degree of deformation can be reduced. The high melting point component has a sufficient melting point difference from the low melting point component, preferably a melting point difference of 10 ° C. or more, more preferably 15 ° C. or more, and is not deformed by heat at a temperature at which the low melting point component is melted. It is preferable that
分割型複合繊維を構成する成分は、特に限定されず、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリトリメチレンテレフタレート、ポリエチレンナフタレート、ポリ乳酸、ポリブチレンサクシネートおよびその共重合体等のポリエステル系樹脂、ポリプロピレン、ポリエチレン（高密度ポリエチレン、低密度ポリエチレン、直鎖状低密度ポリエチレン等を含む）、ポリブテン−１、エチレン−プロピレン共重合体、エチレン−ビニルアルコール共重合体、およびエチレン−酢酸ビニル共重合体等のポリオレフィン系樹脂、ナイロン６、ナイロン１２およびナイロン６６のようなポリアミド系樹脂等から任意に選択される。分割型複合繊維を構成する成分は、それ単独で繊維が構成されたときに公定水分率が５％未満となるものであってよく、あるいは５％を超えるものであってもよい。 The components constituting the split-type composite fiber are not particularly limited, and polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polylactic acid, polybutylene succinate and copolymers thereof, polypropylene , Polyethylene (including high density polyethylene, low density polyethylene, linear low density polyethylene, etc.), polybutene-1, ethylene-propylene copolymer, ethylene-vinyl alcohol copolymer, ethylene-vinyl acetate copolymer, etc. Selected from polyolefin resins, polyamide resins such as nylon 6, nylon 12 and nylon 66, and the like. The component constituting the split-type conjugate fiber may have an official moisture content of less than 5% when the fiber is constituted by itself, or may be more than 5%.
分割型複合繊維を構成する高融点成分／低融点成分の組み合わせは、ポリエチレンテレフタレート／ポリエチレン、ポリエチレンテレフタレート／エチレン−プロピレン共重合体、ポリプロピレン／ポリエチレン等である（ポリエチレンは、高密度ポリエチレン、低密度ポリエチレン、および直鎖状低密度ポリエチレンのいずれか一つまたはそれらの組み合わせである）。ポリエチレンは比較的低い温度で溶融して、繊維同士を良好に接着するので、これを熱接着成分とすることが好ましい。さらに、高融点成分がポリエステル系樹脂であり、かつ後述する太繊度合成繊維がポリエステル系繊維である場合には、太繊度合成繊維の繊度および分割型複合繊維の分割数等を調節することによって、不織布中に繊度の異なるポリエステル系繊維を含めることができる。ウェットシートにおいて、より太い繊度のポリエステル系繊維は液体放出性を高くし、より細い繊度のポリエステル系繊維は微細な繊維間空隙を形成して液体保持性を高くするので、異なる繊度のポリエステル繊維を含むウェットシートは、液体放出性と液体保持性のバランスが良好となる。したがって、上記の組み合わせのうち、特に、ポリエチレンテレフタレート／ポリエチレンの組み合わせが好ましく、他のポリエステル系樹脂／ポリエチレンの組み合わせもまた好ましい。 The combination of the high melting point component / low melting point component constituting the split type composite fiber is polyethylene terephthalate / polyethylene, polyethylene terephthalate / ethylene-propylene copolymer, polypropylene / polyethylene, etc. (polyethylene is high-density polyethylene, low-density polyethylene). , And any one or a combination of linear low density polyethylene). Since polyethylene melts at a relatively low temperature and bonds the fibers satisfactorily, it is preferable to use this as a thermal bonding component. Furthermore, when the high melting point component is a polyester-based resin and the later-described thick fine synthetic fiber is a polyester fiber, by adjusting the fineness of the thick fine synthetic fiber and the number of divisions of the split-type composite fiber, Polyester fibers having different finenesses can be included in the nonwoven fabric. In wet sheets, polyester fibers with larger fineness increase liquid release, and polyester fibers with thinner fineness form fine interfiber spaces to increase liquid retention. The wet sheet to be included has a good balance between the liquid releasing property and the liquid retaining property. Therefore, among the above combinations, a polyethylene terephthalate / polyethylene combination is particularly preferable, and other polyester resin / polyethylene combinations are also preferable.
分割型複合繊維の繊度は、各成分に分割したときに（即ち、各セクションが一本の繊維となったときに）、繊度０．６dtex以下、好ましくは繊度０．５dtex以下の極細繊維を与えるものであれば、特に限定されない。本発明においては、分割型複合繊維に由来する繊維として、低融点成分からなる極細繊維が含まれ、これが繊維同士の交点の少なくとも一部を熱接着している。低融点成分からなる極細繊維の繊度が０．６dtex以下であると、熱接着点が小さいために、不織布の風合いが損なわれにくく、また、不織布が硬くなりにくい。 The fineness of the split-type composite fiber gives an ultrafine fiber having a fineness of 0.6 dtex or less, preferably 0.5 dtex or less when divided into components (ie, when each section becomes a single fiber). If it is a thing, it will not specifically limit. In the present invention, the fibers derived from the split-type composite fibers include ultrafine fibers composed of a low melting point component, which thermally bond at least some of the intersections of the fibers. When the fineness of the ultrafine fiber composed of the low melting point component is 0.6 dtex or less, the thermal bonding point is small, so that the texture of the nonwoven fabric is hardly impaired and the nonwoven fabric is not easily hardened.
そのような極細繊維を発生させるために、分割型複合繊維の繊度は、好ましくは、１dtex以上、９dtex以下であり、より好ましくは、１．５dtex以上、３．５dtex以下であり、さらにより好ましくは、１．５dtex以上、２．５dtex以下である。また、分割型複合繊維における各成分への分割数（即ち、複合繊維におけるセクションの数）は、例えば、４以上、３２以下であることが好ましく、４以上、２０以下であることがより好ましく、６以上、１０以下であることが最も好ましい。分割数が小さいと、繊度０．６dtex以下の極細繊維を形成するために、分割前の繊度を小さくする必要がある。小さい繊度の分割型複合繊維は、製造することが難しく、また不織布の生産性を低下させることがある。分割数が大きい分割型複合繊維は、複雑な紡糸ノズルを用いて、溶融紡糸条件を厳密に制御して製造する必要がある。そのため、そのような分割型複合繊維の使用は不織布の製造コストを上昇させることがある。極細繊維の繊度の下限は、特に限定されないが、０．０５dtex以上であることが好ましい。また、太繊度合成繊維の繊度と、分割型複合繊維の分割により形成される繊維のうち、最も繊度が小さい繊維の繊度との比（太繊度合成繊維の繊度／最小繊度となる極細繊維の繊度）の比は、３以上、１０以下であることが好ましく、４以上、８以下であることがより好ましい。繊度の比がこの範囲内にあると、不織布の広げやすさが向上し、また、不織布の伸びも抑えられる。 In order to generate such ultrafine fibers, the fineness of the split composite fibers is preferably 1 dtex or more and 9 dtex or less, more preferably 1.5 dtex or more and 3.5 dtex or less, and even more preferably 1.5 dtex or more and 2.5 dtex or less. In addition, the number of divisions into components in the split-type conjugate fiber (that is, the number of sections in the conjugate fiber) is, for example, preferably 4 or more and 32 or less, more preferably 4 or more and 20 or less, Most preferably, it is 6 or more and 10 or less. When the number of divisions is small, it is necessary to reduce the fineness before division in order to form ultrafine fibers with a fineness of 0.6 dtex or less. A split type composite fiber having a small fineness is difficult to produce and may reduce the productivity of the nonwoven fabric. A split type composite fiber having a large number of splits needs to be manufactured using a complex spinning nozzle and strictly controlling the melt spinning conditions. Therefore, the use of such split-type composite fibers may increase the manufacturing cost of the nonwoven fabric. The lower limit of the fineness of the ultrafine fiber is not particularly limited, but is preferably 0.05 dtex or more. Also, the ratio of the fineness of the thick fine synthetic fiber to the fineness of the fiber with the smallest fineness among the fibers formed by dividing the split type composite fiber (fineness of the fine fineness that is the fineness of the fineness fine fiber / minimum fineness) ) Is preferably 3 or more and 10 or less, more preferably 4 or more and 8 or less. When the fineness ratio is within this range, the ease of spreading of the nonwoven fabric is improved, and the elongation of the nonwoven fabric is also suppressed.
セクションの形状は特に限定されない。例えば、分割型複合繊維は、楔形のセクションが菊花状に並べられたものであってよい。あるいは、分割型複合繊維は、繊維断面において各セクションが層状に並べられたものであってよい。また、分割型複合繊維は繊維断面を観察したとき長さ方向に連続する空洞部分を有さない、いわゆる中実分割型複合繊維であってよく、あるいは長さ方向に連続する１箇所以上の空洞部分を有する、いわゆる中空分割型複合繊維であってもよい。 The shape of the section is not particularly limited. For example, the split type composite fiber may be one in which wedge-shaped sections are arranged in a chrysanthemum shape. Alternatively, the split-type composite fiber may be one in which each section is arranged in layers in the fiber cross section. Further, the split-type composite fiber may be a so-called solid split-type composite fiber that does not have a cavity portion continuous in the length direction when the fiber cross section is observed, or one or more cavities continuous in the length direction. It may be a so-called hollow split type composite fiber having a portion.
分割型複合繊維を構成する成分の容積比は、得ようとする極細繊維の繊度等に応じて決定される。例えば、低融点成分と高融点成分との容積比は、２：８〜８：２（低融点成分：高融点成分）であることが好ましい。上記範囲内に容積比があると、複合繊維の生産性および複合繊維の分割性が高くなる傾向にある。より好ましい低融点成分：高融点成分の容積比は、４：６〜６：４である。 The volume ratio of the components constituting the split-type conjugate fiber is determined according to the fineness of the ultrafine fiber to be obtained. For example, the volume ratio of the low melting point component to the high melting point component is preferably 2: 8 to 8: 2 (low melting point component: high melting point component). When the volume ratio is within the above range, the productivity of the composite fiber and the splitting property of the composite fiber tend to be high. The volume ratio of the low melting point component: high melting point component is more preferably 4: 6 to 6: 4.
［親水性繊維］
親水性繊維は、不織布に含浸される液体（例えば、液体化粧料）を保持するとともに、保持した液体を対象物に供給する役割をする。
親水性繊維は公定水分率が５％以上の繊維である。公定水分率は、ＪＩＳ Ｌ０１０５（２００６）に示されている。公定水分率が知られていない場合には、次の式から算出される値を公定水分率とする。
公定水分率（％）＝［（Ｗ−Ｗ’）／Ｗ’］×１００
ここで、Ｗは温度２０℃、湿度６５％ＲＨの環境下における繊維の質量（ｇ）、Ｗ’は繊維絶乾時の質量（ｇ）をそれぞれ意味する。なお、温度２０℃、湿度６５％ＲＨの環境下における繊維の質量は、温度２０℃、湿度６５％ＲＨの環境下に繊維を放置し、一定の質量になった時の質量を意味し、繊維絶乾時の質量は、１０５℃に設定した乾燥機中に繊維を放置し、一定の質量になった時の質量を意味する。
[Hydrophilic fiber]
The hydrophilic fiber plays a role of holding a liquid (for example, liquid cosmetic) impregnated in the nonwoven fabric and supplying the held liquid to the object.
The hydrophilic fiber is a fiber having an official moisture content of 5% or more. The official moisture content is shown in JIS L0105 (2006). When the official moisture content is not known, the value calculated from the following formula is used as the official moisture content.
Official moisture content (%) = [(W−W ′) / W ′] × 100
Here, W means the mass (g) of the fiber in an environment of a temperature of 20 ° C. and a humidity of 65% RH, and W ′ means the mass (g) when the fiber is completely dry. In addition, the mass of the fiber in the environment of temperature 20 degreeC and humidity 65% RH means the mass when a fiber is left to stand in the environment of temperature 20 degreeC and humidity 65% RH, and becomes a fixed mass, and fiber The mass at the time of absolute drying means the mass when the fiber is left in a dryer set at 105 ° C. and becomes a constant mass.
親水性繊維は、具体的には、パルプ、コットン、麻、シルク、およびウールなどの天然繊維、ビスコースレーヨン、キュプラ、および溶剤紡糸セルロース繊維などの再生繊維、ならびに親水性を有する合成繊維、または疎水性の合成繊維（公定水分率が５％未満の合成繊維）に親水化処理を施したもの等である。親水化処理として、例えば、コロナ放電処理、スルホン化処理、グラフト重合処理、繊維への親水化剤の練り込み、および耐久性油剤の塗布が挙げられる。親水性繊維は、セルロース系繊維であることが好ましい。セルロース系繊維は、より具体的には、１）機械パルプ、再生パルプおよび化学パルプ等のパルプ、２）コットン（木綿）、麻などの植物性天然繊維、ならびに３）ビスコースレーヨン、キュプラ、および溶剤紡糸セルロース繊維（例えば、レンチングリヨセル（登録商標）およびテンセル（登録商標））等の再生繊維である。 Specific examples of hydrophilic fibers include natural fibers such as pulp, cotton, hemp, silk, and wool, regenerated fibers such as viscose rayon, cupra, and solvent-spun cellulose fibers, and synthetic fibers having hydrophilicity, or Hydrophobic synthetic fibers (synthetic fibers having an official moisture content of less than 5%) are subjected to a hydrophilic treatment. Examples of the hydrophilic treatment include corona discharge treatment, sulfonation treatment, graft polymerization treatment, kneading of a hydrophilic agent into fibers, and application of a durable oil agent. The hydrophilic fiber is preferably a cellulosic fiber. Cellulosic fibers are more specifically 1) pulps such as mechanical pulp, regenerated pulp and chemical pulp, 2) plant natural fibers such as cotton, hemp, and 3) viscose rayon, cupra, and Regenerated fibers such as solvent-spun cellulose fibers (for example, lentung lyocell (registered trademark) and tencel (registered trademark)).
パルプは、針葉樹木材または広葉樹木材を用いて常套の方法で製造されたものであってよい。一般的に、パルプ繊維の繊度は、１．０dtex〜４．０dtex程度、繊維長は０．８mm〜４．５mm程度であるが、この範囲外の繊度および／または繊維長を有するパルプ繊維を使用してもよい。 The pulp may be produced in a conventional manner using coniferous or hardwood wood. In general, the fineness of the pulp fiber is about 1.0 dtex to 4.0 dtex, and the fiber length is about 0.8 mm to 4.5 mm. Pulp fibers having a fineness and / or fiber length outside this range are used. May be.
再生繊維を使用する場合、その繊度は、０．１dtex〜６dtex程度であることが好ましく、０．３dtex〜３．５dtex程度であることがより好ましい。この範囲内の繊度の再生繊維は柔軟性を確保するのに適している。再生繊維の繊度が小さすぎると、繊維ウェブを製造する際のカード通過性が悪化し、不織布の生産性が低下することがある。再生繊維の繊度が大きすぎると、不織布が粗いものとなって、触感が低下することがある。 When using recycled fiber, the fineness thereof is preferably about 0.1 to 6 dtex, more preferably about 0.3 to 3.5 dtex. Regenerated fibers having a fineness within this range are suitable for ensuring flexibility. When the fineness of the regenerated fiber is too small, the card passing property at the time of producing the fiber web is deteriorated, and the productivity of the nonwoven fabric may be lowered. When the fineness of the regenerated fiber is too large, the nonwoven fabric may be rough and the touch may be lowered.
親水性繊維は、再生繊維であることが好ましく、特に、ビスコースレーヨンであることが好ましい。ビスコースレーヨンは、対人用のウェットシートの分野で使用されてきた実績があること、および比較的安価で得やすいことによる。 The hydrophilic fiber is preferably a regenerated fiber, and particularly preferably viscose rayon. Viscose rayon is based on the fact that it has been used in the field of personal wet sheets and is relatively inexpensive and easy to obtain.
［太繊度合成繊維］
前記親水性繊維はそれを含む不織布が液体で濡らされると、不織布の嵩を減少させる、あるいは不織布の強度を減少させやすい。また、親水性繊維を多く含む不織布を濡れた状態で折り畳むと、親水性繊維の影響で不織布表面にも液体が多く存在するようになり、不織布同士が密着しやすく、折り畳まれた不織布を広げにくくなる。かかる不都合を避ける又は軽減するために、本発明の不織布は、繊度が０．８dtex以上であり、融点が１４０℃を超える熱可塑性樹脂で繊維表面が構成されている繊維（太繊度合成繊維）を含む。ここで、融点は繊維にした後の樹脂の融点であり、ＪＩＳ Ｋ７１２１（１９８７）に準じて測定したＤＳＣ曲線より求める。本発明において、太繊度合成繊維は、親水性繊維を含む不織布が濡れたときの嵩の減少（へたり）を抑制するとともに、不織布全体の液含浸性を適度に低下させることにより不織布に含まれる液体の量をコントロールし、不織布が濡れた状態で折り畳まれたときでも、不織布を広げることを容易にする。さらにまた、太繊度合成繊維は、その繊維表面が疎水性である場合には、不織布に液体を保持させたときに、保持した液体をスムーズに放出させる役割をし、ウェットシートの液放出性を高める。
[Thickness synthetic fiber]
When the nonwoven fabric containing the hydrophilic fiber is wetted with a liquid, the volume of the nonwoven fabric is reduced or the strength of the nonwoven fabric is easily reduced. In addition, when a nonwoven fabric containing a large amount of hydrophilic fibers is folded in a wet state, a large amount of liquid is also present on the nonwoven fabric surface due to the influence of hydrophilic fibers, making it easier for the nonwoven fabrics to adhere to each other, making it difficult to spread the folded nonwoven fabric. Become. In order to avoid or reduce such inconvenience, the nonwoven fabric of the present invention is a fiber (thickness synthetic fiber) having a fineness of 0.8 dtex or more and whose fiber surface is composed of a thermoplastic resin having a melting point exceeding 140 ° C. Including. Here, melting | fusing point is melting | fusing point of resin after making it into a fiber, and calculates | requires from the DSC curve measured according to JISK7121 (1987). In the present invention, the high-fineness synthetic fiber is contained in the nonwoven fabric by suppressing the decrease (sagging) of the bulk when the nonwoven fabric containing the hydrophilic fiber is wet, and by appropriately reducing the liquid impregnation property of the entire nonwoven fabric. Controls the amount of liquid and makes it easier to spread the nonwoven even when the nonwoven is folded wet. Furthermore, when the fiber surface is hydrophobic, the thick fine synthetic fiber plays a role of smoothly releasing the retained liquid when the nonwoven fabric retains the liquid, thereby improving the liquid release property of the wet sheet. Increase.
太繊度合成繊維は、融点が１４０℃を超える熱可塑性樹脂で繊維表面が構成されている限りにおいて、単一繊維であっても、複合繊維であってもよい。融点が１４０℃を超える熱可塑性樹脂は、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリトリメチレンテレフタレート、ポリエチレンナフタレート、ポリ乳酸およびその共重合体などから選択されるポリエステル系樹脂；ポリプロピレン、ポリメチルペンテンなどから選択されるポリオレフィン系樹脂；ナイロン６、ナイロン１２およびナイロン６６などから選択されるポリアミド系樹脂；アクリル系樹脂；ポリカーボネート、ポリアセタール、ポリスチレンおよび環状ポリオレフィンなどのエンジニアリング・プラスチック；ならびにそれらのエラストマー系である。太繊度合成繊維の繊維表面を構成する樹脂は、これらの樹脂から選択される一つの樹脂であってよく、あるいは２以上の樹脂の混合物であってよい。 The thick fine synthetic fiber may be a single fiber or a composite fiber as long as the fiber surface is composed of a thermoplastic resin having a melting point exceeding 140 ° C. The thermoplastic resin having a melting point exceeding 140 ° C. is a polyester resin selected from polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polylactic acid and copolymers thereof; polypropylene, polymethylpentene, etc. Polyolefin resins selected; polyamide resins selected from nylon 6, nylon 12 and nylon 66; acrylic resins; engineering plastics such as polycarbonate, polyacetal, polystyrene and cyclic polyolefins; and their elastomeric systems. The resin constituting the fiber surface of the thick fine synthetic fiber may be one resin selected from these resins, or may be a mixture of two or more resins.
太繊度合成繊維が複合繊維である場合、太繊度合成繊維は、例えば、芯成分と鞘成分からなる同心または偏心芯鞘型複合繊維であってよく、２成分を並列して配置した並列型複合繊維（サイドバイサイド型複合繊維とも称す）であってよく、２成分のうち、一方の成分を繊維断面において複数の島成分となるように配置し、もう一方の成分を、前記島成分を取り囲む海成分となるように配置した海島型複合繊維であってもよい。複合繊維を構成する成分は、繊維表面を構成する熱可塑性樹脂の融点が１４０℃を超える限りにおいて、融点が１４０℃以下の熱可塑性樹脂であってよい。 When the thick fine synthetic fiber is a composite fiber, the thick fine synthetic fiber may be, for example, a concentric or eccentric core-sheath type composite fiber composed of a core component and a sheath component, and a parallel type composite in which two components are arranged in parallel. It may be a fiber (also referred to as a side-by-side type composite fiber), and one of the two components is arranged so as to be a plurality of island components in the fiber cross section, and the other component is a sea component that surrounds the island components The sea-island type composite fiber may be arranged so as to be. The component constituting the composite fiber may be a thermoplastic resin having a melting point of 140 ° C. or less as long as the melting point of the thermoplastic resin constituting the fiber surface exceeds 140 ° C.
太繊度合成繊維の繊度は、０．８dtex以上であり、好ましくは０．８dtex以上、５．０dtex以下、より好ましくは１．０dtex以上、３．５dtex以下、最も好ましくは１．１dtex以上、２．５dtex以下である。この範囲内の繊度の太繊度合成繊維は、濡れた状態で折り畳まれた不織布を広げやすくする。太繊度合成繊維の繊度が大きすぎると、肌触りが低下し、肌への密着性、液保持性が低下する。 The fineness of the thick fine synthetic fiber is 0.8 dtex or more, preferably 0.8 dtex or more and 5.0 dtex or less, more preferably 1.0 dtex or more and 3.5 dtex or less, most preferably 1.1 dtex or more. 5 dtex or less. A thick fine synthetic fiber having a fineness within this range makes it easy to spread a nonwoven fabric folded in a wet state. When the fineness of the thick fine synthetic fiber is too large, the touch is lowered, and the adhesion to the skin and the liquid retention are lowered.
［不織布構成］
本発明の不織布は、単層構造を有し、分割型複合繊維に由来する繊維、親水性繊維および太繊度合成繊維を合わせた質量を１００質量％としたときに、分割型複合繊維に由来する繊維を２２質量％以上、３８質量％以下、親水性繊維を２０質量％以上、５３質量％以下、および太繊度合成繊維を２２質量％以上、５８質量％以下含む。好ましくは、分割型複合繊維に由来する繊維を２５質量％以上、３５質量％以下、親水性繊維を２５質量％以上、５０質量％以下、および太繊度合成繊維を２５質量％以上、５０質量％以下含む。より好ましくは、分割型複合繊維に由来する繊維を２５質量％以上、３５質量％以下、親水性繊維を３０質量％以上、４５質量％以下、および太繊度合成繊維を３０質量％以上、４５質量％以下含む。
[Nonwoven fabric structure]
The nonwoven fabric of the present invention has a single-layer structure, and is derived from the split composite fiber when the total mass of the fiber derived from the split composite fiber, the hydrophilic fiber, and the thick synthetic fiber is 100% by mass. The fiber is contained in an amount of 22% by mass or more and 38% by mass or less, the hydrophilic fiber is contained in an amount of 20% by mass or more and 53% by mass or less, and the synthetic fine fiber having a large fineness is contained in an amount of 22% by mass or more. Preferably, the fiber derived from the split type composite fiber is 25% by mass or more and 35% by mass or less, the hydrophilic fiber is 25% by mass or more and 50% by mass or less, and the thick fine synthetic fiber is 25% by mass or more and 50% by mass. Includes: More preferably, the fiber derived from the split type composite fiber is 25% by mass or more and 35% by mass or less, the hydrophilic fiber is 30% by mass or more and 45% by mass or less, and the thick fine synthetic fiber is 30% by mass or more and 45% by mass. % Or less.
本発明の不織布は、所定の三種類の繊維を含む単層構造の不織布として提供される。これは、積層形態の不織布を低い目付で得ようとすると、不織布の均一性が低下し、触感および風合いが低下することがあることによる。 The nonwoven fabric of the present invention is provided as a nonwoven fabric having a single-layer structure containing predetermined three types of fibers. This is because, when trying to obtain a laminated nonwoven fabric with a low basis weight, the uniformity of the nonwoven fabric is lowered, and the touch and texture may be lowered.
上記の割合で三種類の繊維を含む単層構造の不織布は、液体を含浸させた状態で折り畳んだときでも、広げやすい。また、この不織布は、広げた後に変形が生じにくい、即ち、広げるときに伸びが生じにくい。 A single-layered nonwoven fabric containing three types of fibers in the above ratio is easy to spread even when folded in a state of being impregnated with a liquid. In addition, the nonwoven fabric is less likely to be deformed after being spread, that is, less likely to be stretched when being spread.
折り畳まれた不織布の広げやすさ（「展開性」とも呼ぶ）は、特に、液体（例えば、化粧料）を含浸させて皮膚に貼付する（即ち、皮膚を被覆する）液体含浸皮膚被覆シートにおいて要求される。液体含浸皮膚被覆シートには、適用させる体の部位に密着するように、切り込み、切り欠け（例えば、基材の外縁部の一部から、半円、台形、三角形等を切り取って形成される）、打ち抜き加工による開口部などが設けられる。これは、顔の一部または全部に貼付して使用するフェイスマスクであれば、使用時に、不織布を完全に広げた後、目、鼻および口に相当する箇所に設けられた切り込みを、目、鼻および口に合わせながら顔面に密着させる必要があり、角質ケアシート、特に踵に貼付して使用する角質ケアシートであれば、使用時に、不織布を完全に広げた後、踵の曲線に合わせて肌に密着させる必要があり、首から胸元にかけての部位（デコルテ）をケアするデコルテシートであれば、使用時に不織布を完全に広げた後、首から胸元にの曲線に合わせて密着させる必要があるからである。このことからも分かるように、フェイスマスク、角質ケアシートおよびデコルテシートなどの液体含浸皮膚被覆シートは、一部分が折り畳まれた状態で使用することが想定されておらず、完全に広げなければ適切に使用できない。この点は、他のウェットシート（例えば、メイク落とし用シート、制汗シート）とは異なる点である。他のウェットシートにおいても、展開性が良好であれば、シート全体を拭き取り面または液体塗布面として有効に使用でき、あるいはシートに含浸された液体を有効に利用できることはいうまでもない。 Ease of spreading of the folded nonwoven fabric (also referred to as “deployability”) is particularly required in a liquid-impregnated skin-coated sheet that is impregnated with a liquid (eg, cosmetics) and applied to the skin (ie, covers the skin). Is done. In the liquid-impregnated skin-coated sheet, cuts and notches (for example, a semicircle, a trapezoid, a triangle, etc. are formed by cutting a part of the outer edge of the substrate) so as to be in close contact with the body part to be applied. An opening or the like by punching is provided. If this is a face mask that is used by attaching to a part or all of the face, at the time of use, after completely spreading the nonwoven fabric, cuts provided in the locations corresponding to the eyes, nose and mouth, If it is a keratin care sheet, especially a keratin care sheet that is used by sticking it to the heel, it is necessary to make it fit the curve of the heel. If it is a decollete sheet that needs to be in close contact with the skin and cares for the part from the neck to the chest (decollete), the nonwoven fabric must be fully spread during use and then adhered to the neck-to-chest curve Because. As can be seen from this, liquid-impregnated skin-covering sheets such as face masks, keratin care sheets, and decollete sheets are not supposed to be used in a partially folded state. I can not use it. This point is different from other wet sheets (for example, a makeup removing sheet and an antiperspirant sheet). In other wet sheets, if the spreadability is good, it goes without saying that the entire sheet can be used effectively as a wiping surface or a liquid application surface, or the liquid impregnated in the sheet can be used effectively.
ウェットシートの展開性の良し悪しは、上記のとおり、基材である不織布の厚みが薄くなるほど、あるいは不織布の目付が小さくなるほど顕著になる。本発明者らが得た知見によれば、不織布の厚み、または目付が大きいと、不織布を構成する繊維の種類等によらず、展開性は向上する傾向にある。そのため、７０g/m2程度の目付の不織布が実施例として製造された特許文献２および３においては、展開性は着目されておらず、展開性と目付との関係は何ら言及されていない。しかしながら、上記のとおり、ウェットシートの多様化に伴い、低目付の基材を用いることが必要となったため、低目付化に伴う展開性の低下に対処する必要が生じた。本発明は、目付５０g/m2以下の低目付不織布の展開性を、分割型複合繊維に由来する繊維により繊維同士を熱接着すること、太繊度合成繊維を使用すること、これらの繊維および親水性繊維の割合を所定の範囲内とすることによって向上させている。 As described above, the quality of the wet sheet develops more markedly as the thickness of the nonwoven fabric as the substrate becomes thinner or the basis weight of the nonwoven fabric becomes smaller. According to the knowledge obtained by the present inventors, when the thickness or basis weight of the nonwoven fabric is large, the developability tends to be improved regardless of the type of fiber constituting the nonwoven fabric. Therefore, in Patent Documents 2 and 3 in which a non-woven fabric having a basis weight of about 70 g / m 2 is manufactured as an example, the developability is not noticed, and the relationship between the developability and the basis weight is not mentioned at all. However, as described above, with the diversification of wet sheets, it has become necessary to use a low basis weight base material, and thus it has become necessary to cope with a decrease in developability associated with a low basis weight. The present invention relates to the development of a low basis weight nonwoven fabric having a basis weight of 50 g / m 2 or less, by thermally bonding the fibers together with fibers derived from split-type composite fibers, using thick fine synthetic fibers, these fibers and hydrophilic It is improved by making the ratio of the characteristic fiber within a predetermined range.
分割型複合繊維に由来する繊維の割合が、上記の範囲内にあることにより、分割型複合繊維の分割により形成される極細繊維によって、不織布の触感が柔らかくなる。また、分割型複合繊維の分割により形成される低融点成分の極細繊維による熱接着の度合いが適度なものとなって、不織布の展開性が向上し、不織布の過度な伸びも抑制される。分割型複合繊維に由来する繊維の割合が大きすぎると、不織布が硬くなり、ざらついた触感を与える。 When the ratio of the fibers derived from the split composite fibers is within the above range, the feel of the nonwoven fabric is softened by the ultrafine fibers formed by splitting the split composite fibers. In addition, the degree of thermal bonding by the ultrafine fibers of the low melting point component formed by dividing the split type composite fiber becomes appropriate, the developability of the nonwoven fabric is improved, and excessive elongation of the nonwoven fabric is suppressed. When the ratio of the fiber derived from the split type composite fiber is too large, the nonwoven fabric becomes hard and gives a rough feel.
親水性繊維の割合が上記の範囲内にあることにより、不織布に液体を良好に保持させることが可能となる。親水性繊維の割合が大きすぎると、不織布全体の液含浸性が高くなり、不織布が液体を大量に保持するようになる。その結果、折りたたみにより重なり合った不織布表面同士の境界面にも液体が多量に存在するようになり、不織布表面を覆う液体によって不織布表面の間で強い表面張力が生じるために、折り畳んだ状態から不織布を広げようとしても広げにくくなる。また、不織布を広げるのに大きな力が必要になることから、広げた後の不織布に変形（すなわち不織布の伸び）が生じやすくなる。親水性繊維の割合が小さすぎると、不織布の液含浸性が低くなり、ウェットシートや液体含浸皮膚被覆シートに適した量の液体を不織布に含浸できなくなる可能性があるほか、肌への密着性が低下し、使用時の感触が悪くなる可能性がある。 When the ratio of the hydrophilic fibers is within the above range, the liquid can be favorably retained in the nonwoven fabric. When the ratio of the hydrophilic fiber is too large, the liquid impregnation property of the whole nonwoven fabric becomes high, and the nonwoven fabric holds a large amount of liquid. As a result, a large amount of liquid is also present at the interface between the nonwoven fabric surfaces that are overlapped by folding, and a strong surface tension is generated between the nonwoven fabric surfaces by the liquid covering the nonwoven fabric surface. Even if you try to spread it, it becomes difficult to spread. Further, since a large force is required to spread the nonwoven fabric, deformation (that is, elongation of the nonwoven fabric) is likely to occur in the nonwoven fabric after spreading. If the ratio of the hydrophilic fiber is too small, the liquid impregnation of the nonwoven fabric will be low, and the nonwoven fabric may not be able to be impregnated with an amount of liquid suitable for wet sheets or liquid-impregnated skin-covering sheets. May decrease, and the feeling during use may be worsened.
太繊度合成繊維の割合が上記の範囲内にあることにより、不織布の展開性が向上する。これは、太繊度合成繊維の存在により不織布の弾性（コシ）が高くなり、折り畳まれた状態から元に戻ろうとしやすくなる、と推測される。加えて、不織布内部に太繊度合成繊維が存在することで、不織布の液含浸性が適度に抑制され、不織布に含浸される液体の量が過度に大きくならず、液体を含浸させた不織布の重なり合った面の間に生じる液体の表面張力が大きくなりすぎないためとも推測される。太繊度合成繊維の割合が少なすぎると、他の繊維の割合が大きくなって、展開性および不織布強度の点で不都合が生じる。太繊度合成繊維の割合が大きすぎると、液体が保持されにくくなる、あるいは不織布の柔軟性および触感が低下する。 When the proportion of the fine fineness synthetic fiber is within the above range, the developability of the nonwoven fabric is improved. This is presumed that the presence of the thick fine synthetic fiber increases the elasticity of the nonwoven fabric and makes it easier to return from the folded state. In addition, the presence of thick fine synthetic fibers inside the nonwoven fabric moderately suppresses the liquid impregnation property of the nonwoven fabric, the amount of liquid impregnated in the nonwoven fabric does not become excessively large, and the nonwoven fabrics impregnated with liquid overlap. It is also assumed that the surface tension of the liquid generated between the two surfaces does not become too large. If the proportion of the thick fine synthetic fiber is too small, the proportion of the other fibers becomes large, which causes inconvenience in terms of developability and nonwoven fabric strength. If the proportion of the thick fine synthetic fiber is too large, the liquid is hardly retained or the flexibility and tactile sensation of the nonwoven fabric are lowered.
不織布は、分割型複合繊維に由来する繊維を２５質量％以上、３５質量％以下、親水性繊維を３０質量％以上、５０質量％以下、太繊度合成繊維を２５質量％以上、４０質量％以下の割合で含むことが好ましい。これらの割合で三種類の繊維を含む不織布は、展開性、伸び防止、および柔軟性だけでなく、毛羽防止の点でも有利である。 The nonwoven fabric is 25% by mass or more and 35% by mass or less of fibers derived from split-type composite fibers, 30% by mass or more and 50% by mass or less of hydrophilic fibers, and 25% by mass or more and 40% by mass or less of synthetic fine fibers. It is preferable to contain in the ratio. Nonwoven fabrics containing three types of fibers in these proportions are advantageous not only in terms of spreadability, elongation prevention, and flexibility, but also in terms of prevention of fluff.
また、不織布は、分割型複合繊維に由来する繊維と太繊度合成繊維を合わせて４７質量％以上含み、好ましくは５０質量％以上、７５質量％以下含み、より好ましくは５５質量％以上、７０質量％以下含む。分割型複合繊維に由来する繊維と太繊度合成繊維とを合わせた割合が４７質量％以上であると、分割型複合繊維に由来する繊維によって、不織布の展開性をより向上させることができ、不織布を展開した後の伸びをより抑制できる。これは、分割型複合繊維の低融点成分の太繊度合成繊維に対する熱接着強度が、当該低融点成分のレーヨンに対する熱接着強度よりも大きいことによると考えられる。したがって、分割型複合繊維に由来する繊維と太繊度合成繊維とを合わせた割合が一定量以上であると、不織布において強固な熱接着点がある程度多く確保され、外から力が加わっても繊維間の接合が解除されにくく、伸びが生じにくいと考えられる。 In addition, the nonwoven fabric contains 47 mass% or more of the fibers derived from the split-type composite fibers and the thick fine synthetic fiber, preferably 50 mass% or more and 75 mass% or less, more preferably 55 mass% or more and 70 mass%. % Or less. When the ratio of the fiber derived from the split-type composite fiber and the thick fine synthetic fiber is 47% by mass or more, the fiber derived from the split-type composite fiber can further improve the developability of the non-woven fabric. The elongation after developing can be further suppressed. This is considered to be due to the fact that the thermal bond strength of the low melting point component of the split-type composite fiber to the thick fine synthetic fiber is greater than the thermal bond strength of the low melting point component to the rayon. Therefore, if the ratio of the fiber derived from the split-type composite fiber and the thick fine synthetic fiber is a certain amount or more, a certain number of strong thermal bonding points are secured in the nonwoven fabric, and even if force is applied from the outside, it is between the fibers. It is considered that the bonding is difficult to be released and elongation is difficult to occur.
不織布の目付は、上記のとおり３２g/m2以上、５０g/m2以下である。目付がこの範囲内にある不織布をウェットシートとして用いる場合に、展開性の問題が顕著となることによる。また、目付がこの範囲に含まれる不織布は、上記所定の繊維を所定の割合で含有する限りにおいて、実用的な強度を有し、手持ち感、柔軟性および触感において、使用者の満足感を得やすい。不織布の目付が３２g/m2以下であると、不織布の強度（特に後述する１０％伸長時応力）が低くなり、上記所定の繊維を所定の割合で混合しても、良好な展開性が得られない。不織布の目付が５０g/m2を超える場合、展開性の問題がそもそも生じにくいため、本発明の効果が得られにくい。不織布のより好ましい目付は３５g/m2以上、４５g/m2以下であり、最も好ましい不織布の目付は３５g/m2以上、４３g/m2以下である。 The basis weight of the nonwoven fabric is 32 g / m 2 or more and 50 g / m 2 or less as described above. This is because when the nonwoven fabric having a basis weight within this range is used as a wet sheet, the problem of developability becomes significant. In addition, the nonwoven fabric whose basis weight is included in this range has practical strength as long as it contains the above-mentioned predetermined fibers in a predetermined ratio, and obtains user satisfaction in hand feeling, flexibility, and tactile sensation. Cheap. When the basis weight of the nonwoven fabric is 32 g / m 2 or less, the strength of the nonwoven fabric (especially, stress at 10% elongation described later) is low, and even if the predetermined fibers are mixed at a predetermined ratio, good developability is obtained. I can't. When the nonwoven fabric has a basis weight of more than 50 g / m 2 , the problem of developability is hardly caused in the first place, so that the effect of the present invention is hardly obtained. The more preferred basis weight of the nonwoven fabric is 35 g / m 2 or more and 45 g / m 2 or less, and the most preferred basis weight of the nonwoven fabric is 35 g / m 2 or more and 43 g / m 2 or less.
不織布の厚みは特に限定されず、構成繊維の割合、目付および製造条件等によって変化する。不織布の厚み（１cm２あたり３gf（２．９４cN）の荷重を加えたときの厚さ）は、例えば、０．３５mm以上、１．０mm以下であることが好ましく、０．４０mm以上、０．８５mm以下であることがより好ましく、０．４５mm以上、０．８０mm以下であることがさらにより好ましい。不織布の厚みが小さすぎると、不織布を濡らした状態で折り畳んだときに不織布同士が密着しやすく、展開性が低下することがある。また、不織布の厚みがこの範囲内にあると、手持ち感において使用者の満足を得やすく、取り扱い性にも優れている。不織布の厚みが小さすぎると、手持ち感が得られにくい。不織布の厚みが大すぎると、嵩張って取り扱いにくくなり、また、所定の包装袋内に収納できるシートの枚数が少なくなる。 The thickness of a nonwoven fabric is not specifically limited, It changes with the ratio of a constituent fiber, a fabric weight, manufacturing conditions, etc. The thickness of the nonwoven fabric (thickness when a load of 3 gf (2.94 cN) per 1 cm 2 is applied) is preferably 0.35 mm or more and 1.0 mm or less, for example, 0.40 mm or more and 0.85 mm. Or less, more preferably 0.45 mm or more and 0.80 mm or less. If the thickness of the nonwoven fabric is too small, the nonwoven fabric tends to adhere to each other when folded while the nonwoven fabric is wet, and the developability may decrease. Moreover, when the thickness of the nonwoven fabric is within this range, it is easy to obtain the user's satisfaction in the hand feeling, and the handleability is excellent. When the thickness of the nonwoven fabric is too small, it is difficult to obtain a hand feeling. When the thickness of the nonwoven fabric is too large, it becomes bulky and difficult to handle, and the number of sheets that can be stored in a predetermined packaging bag is reduced.
本発明の不織布は、液体を含浸させた状態（即ち、湿潤状態）にて、横方向の１０％伸長時応力が、好ましくは０．３N/50mmより大きく、より好ましくは０．３２N/50mm以上、０．８N/50mm以下であり、最も好ましくは０．３４N/50mm以上、０．７５N/50mm以下である。本発明の不織布は、液体を含浸させた状態（即ち、湿潤状態）にて、横方向の破断伸度が、好ましくは１２０％以上であり、より好ましくは１３０％以上であり、特に好ましくは１３５％以上であり、最も好ましくは１４０％以上である。破断伸度の上限は、例えば２００％以下である。 The nonwoven fabric of the present invention has a 10% elongation stress in the transverse direction in a state impregnated with a liquid (that is, a wet state), preferably larger than 0.3 N / 50 mm, more preferably 0.32 N / 50 mm or more. 0.8 N / 50 mm or less, and most preferably 0.34 N / 50 mm or more and 0.75 N / 50 mm or less. The nonwoven fabric of the present invention has a transverse breaking elongation of preferably 120% or more, more preferably 130% or more, and particularly preferably 135 in a state impregnated with a liquid (that is, a wet state). % Or more, and most preferably 140% or more. The upper limit of the breaking elongation is, for example, 200% or less.
不織布は一般に縦方向（ＭＤ方向）よりも横方向（ＣＤ方向）においてその機械的強度が小さくなる傾向にあり、横方向の機械的強度が最終製品の実用性に影響を与えることが多い。ウェットシートの場合も同様であり、縦方向の強度等は十分であっても、横方向の強度等が小さいと、全体として実用性がないと判断される。液体含浸皮膚被覆シート等のウェットシートは、縦方向と平行な方向にも折り畳まれ、縦方向に折ったシートを広げるときには、横方向に力が加わる。そのため、基材である不織布が、横方向で僅かな力により伸びやすいものであると、展開性が低下し、あるいは広げた後の不織布における伸び（変形度合い）が大きくなる。そのような不都合を避けるために、本発明の不織布の横方向の１０％伸長時応力および破断伸度は上記の範囲内にあることが好ましい。 Nonwoven fabrics generally tend to have lower mechanical strength in the transverse direction (CD direction) than in the longitudinal direction (MD direction), and the mechanical strength in the transverse direction often affects the practicality of the final product. The same applies to a wet sheet. Even if the strength in the vertical direction is sufficient, if the strength in the horizontal direction is small, it is determined that the entire sheet is not practical. A wet sheet such as a liquid-impregnated skin covering sheet is also folded in a direction parallel to the vertical direction, and a force is applied in the horizontal direction when the sheet folded in the vertical direction is spread. Therefore, when the nonwoven fabric which is a base material is easily stretched by a slight force in the lateral direction, the developability is lowered, or the stretch (deformation degree) of the nonwoven fabric after being spread is increased. In order to avoid such an inconvenience, it is preferable that the 10% elongation stress and elongation at break in the transverse direction of the nonwoven fabric of the present invention are within the above ranges.
湿潤状態における不織布の横方向の１０％伸長時応力が０．３N/50mm以下であると、僅かな力で不織布が伸びやすく、取り扱いにくくなるため、濡れた状態で折り畳まれた不織布の端を摘むだけで不織布に伸びが生じやすい、または不織布を広げるときに加わる力で伸びが生じやすい。不織布の破断伸度は、不織布が破断に至るまでの伸びを百分率で表したものであり、これが大きいほど破断に至るまでの伸び代が大きく、繊維が抜けにくいと考えられる。したがって、不織布の破断伸度が１２０％未満であると、僅かな力で繊維の抜けが生じて、不織布に伸びが生じやすく、展開性または展開後の不織布の変形度合いが大きくなる傾向にある。 When the 10% elongation stress in the transverse direction of the nonwoven fabric in a wet state is 0.3 N / 50 mm or less, the nonwoven fabric is easily stretched with a slight force and becomes difficult to handle. Therefore, the end of the nonwoven fabric folded in a wet state is picked. Elongation tends to occur in the nonwoven fabric alone, or elongation tends to occur due to the force applied when spreading the nonwoven fabric. The breaking elongation of the nonwoven fabric is expressed as a percentage of the elongation until the nonwoven fabric breaks, and the larger this is, the larger the elongation allowance to break and the fiber is considered to be less likely to come off. Therefore, if the breaking elongation of the nonwoven fabric is less than 120%, the fibers are pulled out with a slight force, and the nonwoven fabric tends to be stretched, and the developability or the degree of deformation of the nonwoven fabric after deployment tends to increase.
湿潤状態における不織布の縦方向の１０％伸長時応力は、横方向の１０％伸長時応力が上記範囲内にある限りにおいて特に限定されないが、好ましくは２．８N/50mmより大きく、１２．０N/50mm以下である。より好ましくは３．２N/50mm以上、１０．０N/50mm以下であり、最も好ましくは３．５N/50mm以上、８．５N/50mm以下である。また、湿潤状態における不織布の縦方向の破断伸度は、好ましくは２５％以上であり、より好ましくは３０％以上であり、特に好ましくは３５％以上であり、最も好ましくは４０％以上である。縦方向の破断伸度の上限は、例えば１００％以下である。縦方向の１０％伸長時応力が２．８N/50mm以下であると、不織布全体の強度が低くなる傾向があるため、当該不織布の横方向の１０％伸長時応力が０．３N/50mm以下になりやすくなる。その結果、当該不織布は濡れた状態で折り畳まれた不織布の端を摘むだけで不織布に伸びが生じやすかったり、不織布を広げるときに加わる力で伸びが生じやすくなるおそれがある。縦方向の１０％伸長時応力が１２．０N/50mmを超えると不織布全体の強度が高すぎる状態になり、弱い力では縦方向に全く伸びない不織布となる。このような不織布を各種ウェットシートに使用した場合、不織布全体が硬い触感となり使用感が低下する。特に、このような不織布を液体含浸皮膚被覆シートの基材として使用した場合、弱い力では縦方向にほとんど伸びないのでシートを肌に貼りにくくなる。 The 10% elongation stress in the longitudinal direction of the nonwoven fabric in a wet state is not particularly limited as long as the 10% elongation stress in the transverse direction is within the above range, but is preferably greater than 2.8 N / 50 mm and 12.0 N / 50mm or less. More preferably, it is 3.2 N / 50 mm or more and 10.0 N / 50 mm or less, Most preferably, it is 3.5 N / 50 mm or more, 8.5 N / 50 mm or less. Further, the longitudinal elongation at break of the nonwoven fabric in a wet state is preferably 25% or more, more preferably 30% or more, particularly preferably 35% or more, and most preferably 40% or more. The upper limit of the breaking elongation in the longitudinal direction is, for example, 100% or less. If the 10% elongation stress in the longitudinal direction is 2.8 N / 50 mm or less, the strength of the entire nonwoven fabric tends to be low, so the 10% elongation stress in the transverse direction of the nonwoven fabric is 0.3 N / 50 mm or less. It becomes easy to become. As a result, the nonwoven fabric tends to be stretched easily by simply picking the end of the nonwoven fabric folded in a wet state, or may be easily stretched by the force applied when the nonwoven fabric is spread. If the stress at 10% elongation in the longitudinal direction exceeds 12.0 N / 50 mm, the strength of the whole nonwoven fabric becomes too high, and the nonwoven fabric does not stretch at all in the longitudinal direction with a weak force. When such a nonwoven fabric is used for various wet sheets, the entire nonwoven fabric becomes hard to the touch and the usability is lowered. In particular, when such a non-woven fabric is used as a base material for a liquid-impregnated skin-covering sheet, it becomes difficult to stick the sheet to the skin because it hardly stretches in the vertical direction with a weak force.
［不織布の製造方法］
本発明の不織布は、分割型複合繊維、親水性繊維および太繊度合成繊維を含む繊維ウェブを作製し、繊維ウェブを繊維交絡処理に付した後、分割型複合繊維の低融点成分により繊維同士を熱接着させることにより製造される。繊維ウェブは構成繊維を混合して作製する。繊維ウェブの形態は、パラレルウェブ、クロスウェブ、セミランダムウェブおよびランダムウェブ等のカードウェブ、エアレイウェブ、湿式抄紙ウェブ、ならびにスパンボンドウェブ等から選択されるいずれの形態であってもよい。
[Method for producing nonwoven fabric]
The nonwoven fabric of the present invention is a fiber web containing split composite fibers, hydrophilic fibers and thick fine synthetic fibers. After the fiber web is subjected to fiber entanglement treatment, the fibers are separated from each other by the low melting point component of the split composite fibers. Manufactured by thermal bonding. The fiber web is made by mixing the constituent fibers. The form of the fiber web may be any form selected from a card web such as a parallel web, a cross web, a semi-random web and a random web, an air lay web, a wet papermaking web, and a spunbond web.
カードウェブを作製する場合、構成繊維の繊維長は２５mm以上、１００mm以下とすることが好ましく、３０mm以上、７０mm以下とすることがより好ましい。エアレイウェブを作製する場合、構成繊維の繊維長は１mm以上、５０mm以下とすることが好ましく、５mm以上、３０mm以下とすることがより好ましい。湿式抄紙ウェブを作製する場合、構成繊維の繊維長は０．５mm以上、２０mm以下とすることが好ましく、１mm以上、１０mm以下とすることがより好ましい。 When producing a card web, the fiber length of the constituent fibers is preferably 25 mm or more and 100 mm or less, and more preferably 30 mm or more and 70 mm or less. When producing an air laid web, the fiber length of the constituent fibers is preferably 1 mm or more and 50 mm or less, and more preferably 5 mm or more and 30 mm or less. When producing a wet papermaking web, the fiber length of the constituent fibers is preferably 0.5 mm or more and 20 mm or less, and more preferably 1 mm or more and 10 mm or less.
本発明の不織布の製造において、繊維ウェブに施す交絡処理は水流交絡処理であることが好ましい。水流交絡処理によれば、繊維同士が緻密に交絡し、均一で表面の平坦な不織布を得ることができるとともに、分割型複合繊維の分割を繊維交絡と同時に行うことができるからである。 In the production of the nonwoven fabric of the present invention, the entanglement treatment applied to the fiber web is preferably a hydroentanglement treatment. This is because according to the hydroentanglement treatment, the fibers are entangled densely to obtain a nonwoven fabric having a uniform and flat surface, and the split-type composite fibers can be split simultaneously with the fiber entanglement.
水流交絡処理は、支持体に積層体を載せて、柱状水流を噴射することにより実施する。支持体は、不織布表面が平坦となり、かつ凹凸を有しないように、１つあたりの開孔面積が０．２mm２を超える開孔を有さず、また、突起またはパターンが形成されていないものであることが好ましい。例えば、支持体は、８０メッシュ以上、１００メッシュ以下の平織の支持体であることが好ましい。 The hydroentanglement process is carried out by placing a laminate on a support and injecting a columnar water stream. Those support surface of the nonwoven fabric is flat, and so does not have an uneven, open area per one does not have an opening of more than 0.2 mm 2, also not projecting or pattern is formed It is preferable that For example, the support is preferably a plain weave support of 80 mesh or more and 100 mesh or less.
水流交絡処理は、孔径０．０５mm以上、０．５mm以下のオリフィスが０．３mm以上、１．５mm以下の間隔で設けられたノズルから、水圧１MPa以上、１５MPa以下の水流を、繊維ウェブの表裏面にそれぞれ１〜５回ずつ噴射することにより実施してよい。水圧は、好ましくは、１MPa以上、１０MPa以下であり、より好ましくは、１MPa以上、７MPa以下である。 Hydroentanglement treatment is performed by applying a water flow with a water pressure of 1 MPa or more and 15 MPa or less from a nozzle in which orifices having a hole diameter of 0.05 mm or more and 0.5 mm or less are provided at intervals of 0.3 mm or more and 1.5 mm or less. You may implement by injecting 1-5 times to a back surface, respectively. The water pressure is preferably 1 MPa or more and 10 MPa or less, more preferably 1 MPa or more and 7 MPa or less.
交絡処理後の繊維ウェブは、熱接着処理に付される。熱接着処理は分割型複合繊維を構成する低融点成分のみが溶融する温度で実施する。交絡処理が水流交絡処理である場合には、熱接着処理が、繊維ウェブから水分を除去する乾燥処理を兼ねてよい。あるいは、熱接着処理と乾燥処理は別々に実施してよい。 The fiber web after the entanglement process is subjected to a thermal bonding process. The thermal bonding treatment is performed at a temperature at which only the low melting point component constituting the split-type composite fiber melts. When the entanglement process is a hydroentanglement process, the thermal bonding process may also serve as a drying process for removing moisture from the fiber web. Alternatively, the thermal bonding process and the drying process may be performed separately.
熱接着処理において、低融点成分以外の繊維成分が溶融すると、接着点が増える又は大きな接着点が形成されて、不織布の柔軟性が損なわれるので、低融点成分のみが溶融するように、温度を選択する。例えば、分割型複合繊維がポリエチレンテレフタレート／ポリエチレン（ポリエチレンが低融点成分）の組み合わせからなる場合、熱接着処理は、１３０℃以上、１５０℃以下の温度で実施することが好ましい。熱処理温度を調節することによって、低融点成分による熱接着の度合いを変化させることもできる。熱接着の度合いは、不織布の強度、柔軟性、および肌触り等に影響を与える。 In the thermal bonding process, when the fiber component other than the low melting point component melts, the adhesion point increases or a large adhesion point is formed, and the flexibility of the nonwoven fabric is impaired, so the temperature is set so that only the low melting point component melts. select. For example, when the split type composite fiber is made of a combination of polyethylene terephthalate / polyethylene (polyethylene is a low melting point component), the thermal bonding treatment is preferably performed at a temperature of 130 ° C. or higher and 150 ° C. or lower. By adjusting the heat treatment temperature, the degree of thermal adhesion by the low melting point component can be changed. The degree of thermal bonding affects the strength, flexibility, and touch of the nonwoven fabric.
繊維交絡処理後、熱接着処理の前に、必要に応じて、不織布を拡幅ロールによる拡幅処理に付してよい。拡幅処理を施すことにより、ＣＤ方向に向いた繊維の数を増やすことができ、不織布の１０％伸長時応力を向上させることができる。 After the fiber entanglement process, the nonwoven fabric may be subjected to a widening process using a widening roll, if necessary, before the thermal bonding process. By performing the widening process, the number of fibers oriented in the CD direction can be increased, and the stress at 10% elongation of the nonwoven fabric can be improved.
熱接着処理により本発明の不織布が完成する。本発明の不織布はこれに液体を含浸させることにより、ウェットシートを構成する。含浸させる液体および含浸量は、用途に応じて適宜選択される。例えば、ウェットシートを、対人用のウェットワイピングシートとして提供する場合には、水、または洗浄成分を含む水性溶液等を不織布１００質量部に対して、１００質量部以上、１０００質量部以下の含浸量で含浸させてよい。対人用のウェットワイピングシートは、より具体的には、例えば、お手拭き、おしり拭き、経血拭き、化粧落とし用シート、洗顔シート、制汗シート、およびネイルリムーバーとして提供される。 The nonwoven fabric of the present invention is completed by the heat bonding treatment. The nonwoven fabric of this invention comprises a wet sheet by impregnating this with a liquid. The liquid to be impregnated and the amount of impregnation are appropriately selected according to the application. For example, when providing a wet sheet as a wet wiping sheet for personal use, an impregnation amount of 100 parts by mass or more and 1000 parts by mass or less of water or an aqueous solution containing a cleaning component with respect to 100 parts by mass of the nonwoven fabric It may be impregnated with. More specifically, the interpersonal wet wiping sheet is provided as, for example, a hand wipe, a wet wipe, a menstrual wipe, a makeup remover sheet, a face-wash sheet, an antiperspirant sheet, and a nail remover.
ウェットシートを対人用フェイスマスク、角質ケアシートおよびデコルテシートといった対人用液体含浸皮膚被覆シートとして提供する場合には、有効成分を含む液体（例えば化粧料）を不織布１００質量部に対して、１５０質量部以上、２５００質量部以下の含浸量で含浸させてよい。有効成分は、例えば、保湿成分、角質柔軟成分、クレンジング成分、制汗成分、香り成分、美白成分、血行促進成分、紫外線防止成分、および痩身成分等であるが、これらに限定されるものではない。 When the wet sheet is provided as a human liquid-impregnated skin covering sheet such as a human face mask, a keratin care sheet and a decollete sheet, a liquid containing an active ingredient (for example, a cosmetic) is 150 masses with respect to 100 mass parts of the nonwoven fabric. The impregnation amount may be from 1 part to 2500 parts by weight. Examples of the active ingredient include, but are not limited to, a moisturizing ingredient, a keratin softening ingredient, a cleansing ingredient, an antiperspirant ingredient, an aroma ingredient, a whitening ingredient, a blood circulation promoting ingredient, an ultraviolet ray preventing ingredient, and a slimming ingredient. .
フェイスマスクは、顔を被覆するのに適した形状を有し、さらに、例えば、目、鼻および口に相当する部分に、必要に応じて打ち抜き加工による開口部又は切り込み部が設けられた形態で提供される。あるいは、フェイスマスクは、顔の一部分（例えば、目元、口元、鼻または頬）のみを覆うような形状のものであってよい。あるいはまた、フェイスマスクは、目の周囲を覆うシートと、口の周囲を覆うシートとから成るセットとして提供してよく、あるいは３以上の部分を別々に覆うシートのセットとして提供してよい。 The face mask has a shape suitable for covering the face, and further, for example, in a form in which openings or notches by punching are provided as necessary in portions corresponding to eyes, nose and mouth. Provided. Alternatively, the face mask may have a shape that covers only a part of the face (for example, the eyes, mouth, nose or cheek). Alternatively, the face mask may be provided as a set of sheets covering the periphery of the eyes and a sheet covering the periphery of the mouth, or may be provided as a set of sheets covering three or more portions separately.
角質ケアシートは角質が厚く、硬化しやすい踵、肘、膝などに使用される皮膚被覆シートであり、角質柔軟成分および保湿成分等を含む液体を含浸させることにより、角質に対し保湿や軟化を促すシートや、余分な角質の除去を促進する効果を発揮するシートである。本発明の不織布は、いずれの効果・効能を発揮する角質ケアシートにおいても、基材として使用することができる。角質ケアシート、例えば踵用の角質ケアシートは、貼り付ける際に、シートが踵の曲線に合わせやすくなるように、切り込みおよび／もしくは切り欠き、ならびに／またはシートの一部が打ち抜かれて開口部を有する形態で提供される。 A keratin care sheet is a skin-covering sheet used for heels, elbows, knees, etc., which are thick and easily cured, and impregnated with a liquid containing keratin softening and moisturizing ingredients to moisturize and soften the keratin. It is a sheet that promotes the removal of excess keratin and the sheet that promotes the removal of excess keratin. The nonwoven fabric of the present invention can be used as a base material in any keratin care sheet that exhibits any effect or effect. A keratin care sheet, for example, a keratin care sheet for wrinkles, has an opening formed by cutting and / or notching and / or part of the sheet so that the sheet can be easily fitted to the wrinkle curve. Is provided in a form having
液体含浸皮膚被覆シートは、身体の任意の部位（例えば、首、手の甲、首から胸元までの部位（デコルテとも呼ばれている））を保湿またはその他のケアをするために用いられる、保湿成分またはその他の有効を含む液体を含浸させた保湿シートであってよい。あるいは、液体含浸皮膚被覆シートは、痩身成分を含む液体を含浸させた、痩身用シートであってよい。痩身用シートは、例えば、大腿部または腹部に貼り付けて用いられる。 A liquid-impregnated skin-covering sheet is a moisturizing ingredient or used to moisturize or otherwise care for any part of the body (eg neck, back of hand, neck-to-chest part (also called decollete)) It may be a moisturizing sheet impregnated with a liquid containing other effects. Alternatively, the liquid-impregnated skin coating sheet may be a slimming sheet impregnated with a liquid containing a slimming component. The slimming sheet is used by being attached to the thigh or the abdomen, for example.
上記対人用のウェットワイピングシートまたは対人用液体含浸皮膚被覆シートは、基材である不織布が折り畳まれた状態で提供されてよい。本発明の不織布は、濡らして折り畳まれた状態から広げやすいものであるため、所定の包装袋または容器に収納するために、複数回折り畳まれた状態で提供されるのに適している。折り畳みは、不織布の一方向においてのみ行ってよく、あるいは不織布の異なる方向においてそれぞれ１回以上行われていてよい。例えば、液体を含浸させた不織布を、縦方向と平行な方向に（即ち、折り目が縦方向と平行となるように）１回以上折り畳み、横方向と平行な方向に（即ち、折り目が横方向と平行となるように）１回以上折り畳んで、ウェットワイピングシートまたは液体含浸皮膚被覆シートとして提供してよい。 The interpersonal wet wiping sheet or the interpersonal liquid-impregnated skin-covering sheet may be provided in a state in which a nonwoven fabric as a base material is folded. Since the nonwoven fabric of the present invention is easy to spread from a wet and folded state, it is suitable for being provided in a plurality of folded states for storage in a predetermined packaging bag or container. The folding may be performed only in one direction of the nonwoven fabric, or may be performed once or more in each different direction of the nonwoven fabric. For example, a nonwoven fabric impregnated with a liquid is folded at least once in a direction parallel to the longitudinal direction (that is, the fold line is parallel to the longitudinal direction), and in a direction parallel to the lateral direction (that is, the crease is lateral direction). And may be provided as a wet wiping sheet or a liquid-impregnated skin-covering sheet.
以下、本発明を実施例により説明する。
本実施例で用いる繊維として下記のものを用意した。
Hereinafter, the present invention will be described with reference to examples.
The following fibers were prepared as fibers used in this example.
［親水性繊維１］ 繊度１．５dtex〜１．７dtex、繊維長４０mmのビスコースレーヨン（商品名ＣＤ ダイワボウレーヨン（株）製）
［親水性繊維２］ 繊度１．０〜５．０dtex、繊維長１０〜６０mmのコットン
［太繊度合成繊維］ 繊度１．４５dtex、繊維長３８mmのポリエチレンテレフタレートからなる繊維（商品名Ｔ４０２ 東レ（株）製）
［分割型複合繊維］ 繊度２．２dtex、繊維長５１mmのポリエチレンテレフタレート／高密度ポリエチレンの組み合わせから成る、分割数８の分割型複合繊維（分割により形成される繊維のうち最小の繊度を有するものの繊度は０．２７５dtex）（商品名ＤＦＳ（ＳＨ） ダイワボウポリテック（株）製）
[Hydrophilic fiber 1] Viscose rayon having a fineness of 1.5 dtex to 1.7 dtex and a fiber length of 40 mm (trade name CD manufactured by Daiwabo Rayon Co., Ltd.)
[Hydrophilic fiber 2] Cotton having a fineness of 1.0 to 5.0 dtex and a fiber length of 10 to 60 mm [Thick fineness synthetic fiber] A fiber made of polyethylene terephthalate having a fineness of 1.45 dtex and a fiber length of 38 mm (trade name T402 Toray Industries, Inc.) Made)
[Split type composite fiber] A split type composite fiber having a fineness of 2.2 dtex and a fiber length of 51 mm and a combination of polyethylene terephthalate / high density polyethylene (split type composite fiber having the smallest fineness among the fibers formed by splitting) Is 0.275 dtex) (trade name DFS (SH) manufactured by Daiwabo Polytech Co., Ltd.)
（実施例１）
親水性繊維４０質量％、太繊度合成繊維としてのポリエステル繊維３５質量％、分割型複合繊維２５質量％を混合して、パラレルカード機を用いて、ウェブ狙い目付約３５g/m2でパラレルウェブを作製した。このウェブに、水流交絡処理を施して、繊維同士を交絡させるとともに、分割型複合繊維を分割させた。水流交絡処理は、孔径０．０８mmのオリフィスが０．６mm間隔で設けられたノズルを用いてウェブの一方の面に２．０MPaの柱状水流を３回噴射し、他方の面に２．５MPaの柱状水流を２回噴射して実施した。水流交絡処理後の繊維ウェブを、温度１４０℃の熱処理に付し、乾燥処理と熱接着処理を同時に実施した。熱処理により、分割型複合繊維を構成するポリエチレンのみを溶融させて、ポリエチレンによって構成繊維同士を熱接着して、不織布を得た。
Example 1
Mix 40% by weight of hydrophilic fiber, 35% by weight of polyester fiber as thick synthetic fiber, and 25% by weight of split composite fiber, and use a parallel card machine to create a parallel web with a web target weight of about 35g / m 2. Produced. The web was subjected to hydroentanglement treatment to entangle the fibers and divide the split type composite fiber. In the hydroentanglement treatment, a 2.0 MPa columnar water stream is jetted on one side of the web three times using a nozzle having an orifice having a hole diameter of 0.08 mm at intervals of 0.6 mm, and the other side is 2.5 MPa. A columnar water stream was jetted twice. The fiber web after the hydroentanglement treatment was subjected to a heat treatment at a temperature of 140 ° C., and a drying treatment and a heat bonding treatment were performed simultaneously. By heat treatment, only the polyethylene constituting the split-type conjugate fiber was melted, and the constituent fibers were thermally bonded with polyethylene to obtain a nonwoven fabric.
（実施例２〜９、比較例１〜７）
親水性繊維の種類および割合、太繊度合成繊維の割合、分割型複合繊維の割合、およびウェブ狙い目付を表１および表２に示すとおりとして、実施例１で採用した条件と同じ条件で水流交絡処理、および熱接着処理（乾燥処理）を実施して不織布を得た。
実施例１〜９、比較例１〜７で得た不織布について、目付、厚み、湿潤時の引張強度、破断伸度、および１０％伸長時応力、ならびに使用感を、以下の方法に従って評価した。評価結果を表１および表２に示す。
(Examples 2-9, Comparative Examples 1-7)
Hydroentanglement under the same conditions as those used in Example 1, assuming that the types and ratios of hydrophilic fibers, the ratio of thick synthetic fibers, the ratio of split-type composite fibers, and the web target weight are as shown in Tables 1 and 2. The nonwoven fabric was obtained by carrying out the treatment and thermal bonding treatment (drying treatment).
About the nonwoven fabrics obtained in Examples 1 to 9 and Comparative Examples 1 to 7, the basis weight, thickness, tensile strength when wet, elongation at break, stress at 10% elongation, and feeling of use were evaluated according to the following methods. The evaluation results are shown in Tables 1 and 2.
［厚み］
厚み測定機（商品名 THICKNESS GAUGE モデル ＣＲ−６０Ａ （株）大栄科学精器製作所製）を用い、試料１cm2あたり３ｇの荷重を加えた状態で測定した。
[Thickness]
Using a thickness measuring machine (trade name: THICKNESS GAUGE model CR-60A, manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.), measurement was performed with a load of 3 g per 1 cm 2 of the sample.
［湿潤時の引張強度、破断伸度、１０％伸長時応力］
ＪＩＳ Ｌ １０９６ ６．１２．１ Ａ法（ストリップ法）に準じて、定速緊張形引張試験機を用いて、試料片の幅５cm、つかみ間隔１０cm、引張速度３０±２cm／分の条件で引張試験に付し、切断時の荷重値（引張強度）、破断伸度、ならびに１０％伸長時応力を測定した。これらの物性は、試料１００質量部に対して、２００質量部の蒸留水を含浸させた状態で測定した。引張試験は、不織布の縦方向（ＭＤ方向）および横方向（ＣＤ方向）を引張方向として実施した。評価結果はいずれも３点の試料について測定した値の平均で示している。
[Tensile strength when wet, elongation at break, stress at 10% elongation]
In accordance with JIS L 1096 6.12.1 A method (strip method), using a constant-speed tension type tensile tester, tension was performed under the conditions of a sample piece width of 5 cm, a grip interval of 10 cm, and a tensile speed of 30 ± 2 cm / min. It attached to the test and measured the load value at the time of cutting (tensile strength), elongation at break, and stress at 10% elongation. These physical properties were measured in a state where 200 parts by mass of distilled water was impregnated with respect to 100 parts by mass of the sample. The tensile test was carried out with the longitudinal direction (MD direction) and the lateral direction (CD direction) of the nonwoven fabric as the tensile direction. All the evaluation results are shown as an average of values measured for three samples.
［使用感］
本発明の不織布をウェットシートにして使用した場合の使用感を評価するため、下記の方法で官能評価を行った。
不織布を縦２０cm×横２０cmの大きさに裁断する。次に、前記不織布の試料１００質量部に対し、６００質量部となるように市販の化粧料（ロート製薬(株)製 極潤（登録商標） ヒアルロン液）を秤量する。裁断した不織布をまず３つ折りにし、その後に長辺方向に２つ折りした状態でポリエチレン製の袋に入れ、その中に秤量した化粧料を入れ、不織布試料が折られた状態を維持しつつ、無加重の状態で平面にて２４時間放置して、不織布に化粧料を十分に含浸させる。ポリエチレン袋から試料を静かに取り出し、折り畳んだ状態から広げ、その際の展開性（広げやすさ）と伸びにくさを評価する。シート状に広げた試料表面を成人女性が指先で触り、不織布の柔らかさを評価した。柔らかさ、展開性（広げやすさ）、展開後の伸び（伸びにくさ）の評価基準は下記のとおりである。
（１）柔らかさ
○：非常にソフトで肌あたりが良い。
△：触感に硬さがあるが、対人ウェットシートとして使用できる。
×：不織布が硬い、あるいは指先にチクチクした刺激を感じる。
（２）展開性
○：簡単に、完全に開くことができる。
△：完全に開くことができるが開くまでに若干時間を要する。
×：一部において開くことができない、または完全に開くのに相当な時間を要する。
（３）展開後の伸び
○：開いた後に、不織布がほとんど伸びない。
△：開いた後に、不織布が若干伸びている。
×：開いた後に、不織布が伸びている。
[Usage feeling]
In order to evaluate the feeling of use when the nonwoven fabric of the present invention was used as a wet sheet, sensory evaluation was performed by the following method.
The nonwoven fabric is cut into a size of 20 cm in length and 20 cm in width. Next, a commercially available cosmetic (Rohto Pharmaceutical Co., Ltd. Gokujun (registered trademark) hyaluronic liquid) is weighed so as to be 600 parts by mass with respect to 100 parts by mass of the nonwoven fabric sample. The cut non-woven fabric is first folded in three, and then folded in the long side direction into a polyethylene bag, and weighed cosmetics are placed therein, while maintaining the state in which the non-woven fabric sample is folded. It is allowed to stand for 24 hours on a flat surface under load, and the nonwoven fabric is sufficiently impregnated with cosmetics. Gently remove the sample from the polyethylene bag, spread it from the folded state, and evaluate the unfoldability (ease of spreading) and the difficulty of stretching. An adult woman touched the surface of the sample spread in a sheet shape with a fingertip, and the softness of the nonwoven fabric was evaluated. The evaluation criteria of softness, developability (ease of spreading), and elongation after development (hardness to stretch) are as follows.
(1) Softness ○: Very soft and soft against the skin.
Δ: Hard to touch, but can be used as an interpersonal wet sheet.
X: The nonwoven fabric is hard or feels irritation on the fingertips.
(2) Expandability ○: Can be opened easily and completely.
Δ: Although it can be completely opened, it takes some time to open.
X: Some portions cannot be opened, or considerable time is required for complete opening.
(3) Elongation after deployment ○: The nonwoven fabric hardly stretches after opening.
Δ: After opening, the nonwoven fabric is slightly stretched.
X: After opening, the nonwoven fabric is stretched.
表１および表２に示すように、実施例１〜９の不織布は「柔らかさ」、「展開性」および「展開後の伸び」のうち２つ以上で「○」の評価が得られ、また、いずれの項目についても「×」と評価されず、ウェットシート、並びに液体含浸皮膚被覆シートとして使用するのに適しているものであった。実施例３および４は、分割型複合繊維に由来する繊維の割合が、実施例１、６および７のそれと同じであったが、太繊度合成繊維の割合が多かったために、良好な展開性が得られたものと考えられる。 As shown in Table 1 and Table 2, the nonwoven fabrics of Examples 1 to 9 have an evaluation of “◯” in two or more of “softness”, “deployability” and “elongation after deployment”. None of the items were evaluated as “x”, and were suitable for use as wet sheets and liquid-impregnated skin-coated sheets. In Examples 3 and 4, the ratio of the fibers derived from the split-type composite fibers was the same as that in Examples 1, 6, and 7. However, since the ratio of the thick fine synthetic fibers was large, the good developability was obtained. It is thought that it was obtained.
比較例１の不織布は、実施例１の不織布と同じ繊維構成を有していたが、目付が小さかったために、１０％伸長時応力が十分な大きさとならず、展開性および展開後の伸びについて実施例１よりも劣っていた。比較例２の不織布は太繊度合成繊維を含まなかったために、展開性が悪く、伸びやすいものであった。比較例２の不織布は、太繊度合成繊維を含まないことに加え、親水性繊維の割合が多かったことで、液体を含浸させると不織布が液体を大量に含み、不織布表面にも液体が大量に存在する。そのため、液体を含浸させた状態で不織布が折り畳まれていると、折り畳まれて、接触している不織布表面の境界面にも液体が過剰に存在し、当該境界面にて液体の表面張力が大きくなることで展開性が悪くなり、実施例の不織布よりも大きな力で広げようとするため、使用時の伸びが大きくなったと考えられる。比較例３においては、分割型複合繊維に由来する繊維の割合が小さく、繊維同士が十分に熱接着されなかったために、得られた不織布は展開性が悪く、伸びも生じやすくなったと考えられる。 The nonwoven fabric of Comparative Example 1 had the same fiber configuration as the nonwoven fabric of Example 1, but because the basis weight was small, the stress at the time of 10% elongation was not sufficiently large. It was inferior to Example 1. Since the nonwoven fabric of Comparative Example 2 did not contain thick fine synthetic fibers, it had poor developability and was easy to stretch. The nonwoven fabric of Comparative Example 2 does not contain thick fine synthetic fibers and has a high ratio of hydrophilic fibers. When impregnated with liquid, the nonwoven fabric contains a large amount of liquid, and the nonwoven fabric surface also contains a large amount of liquid. Exists. For this reason, when the nonwoven fabric is folded in a liquid-impregnated state, the liquid is excessively present at the boundary surface of the nonwoven fabric surface that is folded and in contact, and the surface tension of the liquid is large at the boundary surface. As a result, the developability deteriorates, and it is considered that the elongation at the time of use has increased because it tends to spread with a greater force than the nonwoven fabric of the example. In Comparative Example 3, since the ratio of the fibers derived from the split-type composite fibers was small and the fibers were not sufficiently thermally bonded to each other, it was considered that the obtained nonwoven fabric was poor in developability and easily stretched.
比較例４においては、分割型複合繊維に由来する繊維の割合が大きく、熱接着点の数が多かったために、柔らかい不織布が得られなかったと考えられる。比較例５においては、太繊度合成繊維の割合が少ないために、得られた不織布において展開性が悪く、また、伸びが生じやすくなったと考えられる。比較例６および７においては、親水性繊維の割合が大きく、分割型複合繊維の割合も比較的大きかったために、繊維同士が交絡しすぎて、柔らかい不織布が得られなかったと考えられる。また、比較例７においては、分割型複合繊維の割合が小さかったために、得られた不織布において伸びが大きくなったと考えられる。 In Comparative Example 4, it is considered that a soft nonwoven fabric could not be obtained because the proportion of fibers derived from split-type composite fibers was large and the number of thermal bonding points was large. In Comparative Example 5, since the proportion of thick fine synthetic fibers is small, it is considered that the resulting nonwoven fabric has poor developability and is easily stretched. In Comparative Examples 6 and 7, since the ratio of hydrophilic fibers was large and the ratio of split-type composite fibers was relatively large, it was considered that the fibers were too entangled and a soft nonwoven fabric could not be obtained. Moreover, in Comparative Example 7, since the proportion of the split-type conjugate fiber was small, it is considered that the elongation was increased in the obtained nonwoven fabric.
本発明には以下の態様のものが含まれる。
（態様１）
液体を含浸させたウェットシートの基材として用いる不織布であって、
２以上の成分から成る分割型複合繊維に由来する繊維、親水性繊維、および繊度０．８dtex以上の合成繊維（以下、「太繊度合成繊維」）を含む単層構造を有し、
前記分割型複合繊維に由来する繊維、前記親水性繊維、および前記太繊度合成繊維を合わせた質量を１００質量％としたときに、前記分割型複合繊維に由来する繊維を２２質量％以上、３８質量％以下、前記親水性繊維を２０質量％以上、５３質量％以下、および前記太繊度合成繊維を２２質量％以上、５８質量％以下含み、
前記分割型複合繊維は、融点が１４０℃以下の熱可塑性樹脂の成分（以下、「低融点成分」）と、融点が１４０℃を超える熱可塑性樹脂の成分（以下、「高融点成分」）とを含み、
前記太繊度合成繊維は、融点が１４０℃を超える熱可塑性樹脂で繊維表面が構成されており、
前記分割型複合繊維に由来する繊維として、前記低融点成分からなる繊度０．６dtex以下の極細繊維、および前記高融点成分からなる繊度０．６dtex以下の極細繊維を含み、
構成繊維の交点の少なくとも一部が、前記低融点成分からなる極細繊維によって熱接着されている、
不織布。
（態様２）
前記低融点成分がポリエチレンである、態様１に記載の不織布。
（態様３）
前記高融点成分が、ポリエステル系樹脂またはポリオレフィン系樹脂である、態様１または２に記載の不織布。
（態様４）
前記太繊度合成繊維が、単一繊維、及び／または、融点が１４０℃を超える熱可塑性樹脂を鞘成分とする芯鞘型複合繊維である、態様１〜３のいずれかに記載の不織布。
（態様５）
前記太繊度合成繊維が、ポリエステル系樹脂からなる単一繊維である、態様１〜３のいずれかに記載の不織布。
（態様６）
前記分割型複合繊維に由来する繊維、前記親水性繊維、および前記太繊度合成繊維のみからなる、態様１〜５のいずれかに記載の不織布。
（態様７）
前記分割型複合繊維および前記太繊度合成繊維を合わせて６０質量％以上含む、態様１〜６のいずれかに記載の不織布。
（態様８）
湿潤状態における不織布の横方向の１０％伸長時応力が０．３N/50mmを超える、態様１〜６のいずれかに記載の不織布。
（態様９）
態様１〜８のいずれかに記載の不織布を基材とし、前記基材１００質量部に対して、液体が１００質量部以上、１０００質量部以下の範囲内にある割合で含浸されている、対人用ウェットワイピングシート。
（態様１０）
前記不織布の縦方向と平行な方向に１回以上、横方向と平行な方向に１回以上折り畳まれている、態様９に記載の対人用ウェットワイピングシート。
（態様１１）
態様１〜８のいずれかに記載の不織布を基材とし、前記基材１００質量部に対して、液体が１５０質量部以上、２５００質量部以下の範囲内にある割合で含浸されている、対人用液体含浸皮膚被覆シート。
（態様１２）
前記不織布の縦方向と平行な方向に１回以上、横方向と平行な方向に１回以上折り畳まれている、態様１１に記載の対人用液体含浸皮膚被覆シート。
The present invention includes the following aspects.
(Aspect 1)
A nonwoven fabric used as a base material for a wet sheet impregnated with a liquid,
Having a single-layer structure including a fiber derived from a split-type composite fiber composed of two or more components, a hydrophilic fiber, and a synthetic fiber having a fineness of 0.8 dtex or more (hereinafter referred to as “thick fine synthetic fiber”);
When the mass of the fiber derived from the split-type conjugate fiber, the hydrophilic fiber, and the thick synthetic fiber is 100% by mass, the fiber derived from the split-type conjugate fiber is 22% by mass or more, 38 % By mass or less, 20% by mass or more and 53% by mass or less of the hydrophilic fiber, and 22% by mass or more and 58% by mass or less of the synthetic fiber having the above-mentioned fineness,
The split type composite fiber is composed of a thermoplastic resin component having a melting point of 140 ° C. or lower (hereinafter referred to as “low-melting component”), and a thermoplastic resin component having a melting point exceeding 140 ° C. (hereinafter referred to as “high-melting component”). Including
The thick fine synthetic fiber has a fiber surface made of a thermoplastic resin having a melting point exceeding 140 ° C.,
As fibers derived from the split-type composite fiber, including ultrafine fibers having a fineness of 0.6 dtex or less consisting of the low melting point component, and ultrafine fibers having a fineness of 0.6 dtex or less consisting of the high melting point component,
At least some of the intersections of the constituent fibers are thermally bonded by the ultrafine fibers made of the low melting point component,
Non-woven fabric.
(Aspect 2)
The nonwoven fabric according to aspect 1, wherein the low melting point component is polyethylene.
(Aspect 3)
The nonwoven fabric according to aspect 1 or 2, wherein the high melting point component is a polyester resin or a polyolefin resin.
(Aspect 4)
The nonwoven fabric according to any one of aspects 1 to 3, wherein the thick fine synthetic fiber is a core-sheath type composite fiber having a single fiber and / or a thermoplastic resin having a melting point exceeding 140 ° C as a sheath component.
(Aspect 5)
The nonwoven fabric according to any one of aspects 1 to 3, wherein the thick fine synthetic fiber is a single fiber made of a polyester resin.
(Aspect 6)
The nonwoven fabric in any one of aspects 1-5 which consists only of the fiber originating in the said split-type composite fiber, the said hydrophilic fiber, and the said thick fine synthetic fiber.
(Aspect 7)
The nonwoven fabric according to any one of aspects 1 to 6, comprising 60% by mass or more of the split composite fiber and the thick fine synthetic fiber.
(Aspect 8)
The nonwoven fabric in any one of the aspects 1-6 in which the stress at the time of 10% elongation of the nonwoven fabric in the wet state exceeds 0.3 N / 50 mm.
(Aspect 9)
The non-woven fabric according to any one of aspects 1 to 8 is used as a base material, and the liquid is impregnated at a ratio of 100 parts by mass or more and 1000 parts by mass or less with respect to 100 parts by mass of the base material. Wet wiping sheet.
(Aspect 10)
The interpersonal wet wiping sheet according to aspect 9, which is folded at least once in a direction parallel to the longitudinal direction of the nonwoven fabric and at least once in a direction parallel to the transverse direction.
(Aspect 11)
The non-woven fabric according to any one of aspects 1 to 8 is used as a base material, and the liquid is impregnated at a ratio of 150 parts by mass or more and 2500 parts by mass or less with respect to 100 parts by mass of the base material. Liquid impregnated skin coating sheet.
(Aspect 12)
The interpersonal liquid-impregnated skin-coated sheet according to aspect 11, which is folded at least once in a direction parallel to the longitudinal direction of the nonwoven fabric and at least once in a direction parallel to the transverse direction.
本発明の不織布は、液体を含浸させて折り畳んだ状態から広げることが容易なものであるので、折り畳んで所定の包装袋または容器に収納した状態で提供される、ウェットワイピングシートや液体含浸皮膚被覆シート、特に目、鼻、口元など、複雑な形状にフィットすることが求められるため、切り込み、打ち抜きなどの後加工が多く行われ、液体化粧料で湿潤したシートの開きやすさが求められるフェイスマスクの基材として有用である。 Since the nonwoven fabric of the present invention can be easily spread from a state of being impregnated with a liquid and folded, a wet wiping sheet or a liquid-impregnated skin coating provided in a state of being folded and stored in a predetermined packaging bag or container Face masks that require easy opening of sheets moistened with liquid cosmetics because they are required to fit into complicated shapes such as sheets, especially eyes, nose, and mouth, and are often post-processed such as cutting and punching. It is useful as a base material.
Claims (13)
２以上の成分から成る分割型複合繊維に由来する繊維、親水性繊維、および繊度０．８dtex以上の合成繊維（以下、「太繊度合成繊維」）を含む単層構造を有し、
前記分割型複合繊維に由来する繊維、前記親水性繊維、および前記太繊度合成繊維を合わせた質量を１００質量％としたときに、前記分割型複合繊維に由来する繊維を２２質量％以上、３８質量％以下、前記親水性繊維を２０質量％以上、４５質量％以下、および前記太繊度合成繊維を２２質量％以上、５８質量％以下含み、
前記分割型複合繊維は、融点が１４０℃以下の熱可塑性樹脂の成分（以下、「低融点成分」）と、融点が１４０℃を超える熱可塑性樹脂の成分（以下、「高融点成分」）とを含み、
前記太繊度合成繊維は、融点が１４０℃を超える熱可塑性樹脂で繊維表面が構成されており、
前記分割型複合繊維に由来する繊維として、前記低融点成分からなる繊度０．６dtex以下の極細繊維、および前記高融点成分からなる繊度０．６dtex以下の極細繊維を含み、
構成繊維の交点の少なくとも一部が、前記低融点成分からなる極細繊維によって熱接着されており、
目付が３２g/m 2 以上、５０g/m 2 以下である、
不織布。 A nonwoven fabric used as a base material for a wet sheet impregnated with a liquid,
Having a single-layer structure including a fiber derived from a split-type composite fiber composed of two or more components, a hydrophilic fiber, and a synthetic fiber having a fineness of 0.8 dtex or more (hereinafter referred to as “thick fine synthetic fiber”);
When the mass of the fiber derived from the split-type conjugate fiber, the hydrophilic fiber, and the thick synthetic fiber is 100% by mass, the fiber derived from the split-type conjugate fiber is 22% by mass or more, 38 Containing 20% by mass or more, 45 % by mass or less of the hydrophilic fiber, and 22% by mass or more and 58% by mass or less of the thick fine fiber
The split type composite fiber is composed of a thermoplastic resin component having a melting point of 140 ° C. or lower (hereinafter referred to as “low-melting component”), and a thermoplastic resin component having a melting point exceeding 140 ° C. (hereinafter referred to as “high-melting component”). Including
The thick fine synthetic fiber has a fiber surface made of a thermoplastic resin having a melting point exceeding 140 ° C.,
As fibers derived from the split-type composite fiber, including ultrafine fibers having a fineness of 0.6 dtex or less consisting of the low melting point component, and ultrafine fibers having a fineness of 0.6 dtex or less consisting of the high melting point component,
At least some of the intersections of the constituent fibers are thermally bonded by the ultrafine fibers composed of the low melting point component ,
The basis weight is 32 g / m 2 or more and 50 g / m 2 or less .
Non-woven fabric.
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| JP6775298B2 (en) * | 2015-12-18 | 2020-10-28 | 倉敷繊維加工株式会社 | Non-woven fabric for beauty face mask |
| KR20170113435A (en) * | 2016-04-01 | 2017-10-12 | 코오롱인더스트리 주식회사 | The Non-woven fabric Sheet For Mask Pack |
| EP3482652B1 (en) * | 2016-07-07 | 2021-04-28 | Taiki Corp., Ltd. | Cosmetic |
| JP6607609B2 (en) * | 2016-12-27 | 2019-11-20 | 金星製紙株式会社 | Extra fine fiber nonwoven fabric |
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| US20200170382A1 (en) * | 2017-06-21 | 2020-06-04 | Toray Industries, Inc. | Nonwoven fabric for skin care products |
| JP7064095B2 (en) * | 2017-08-10 | 2022-05-10 | 大和紡績株式会社 | Interpersonal wipers and laminated non-woven fabrics for interpersonal wipers |
| WO2019151527A1 (en) * | 2018-02-05 | 2019-08-08 | ダイワボウホールディングス株式会社 | Non-woven fabric and method for manufacturing non-woven fabric |
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| JP7089413B2 (en) * | 2018-06-15 | 2022-06-22 | 大王製紙株式会社 | Wet wipes |
| JP7392651B2 (en) * | 2018-10-02 | 2023-12-06 | 東レ株式会社 | Non-woven fabrics for skin care products, face masks and cleansing sheets |
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