JP2019130159A - Absorbent article - Google Patents
Absorbent article Download PDFInfo
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- JP2019130159A JP2019130159A JP2018016168A JP2018016168A JP2019130159A JP 2019130159 A JP2019130159 A JP 2019130159A JP 2018016168 A JP2018016168 A JP 2018016168A JP 2018016168 A JP2018016168 A JP 2018016168A JP 2019130159 A JP2019130159 A JP 2019130159A
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- Prior art keywords
- liquid
- hollow
- absorbent article
- fiber
- nonwoven fabric
- Prior art date
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- 230000002745 absorbent Effects 0.000 title claims abstract description 31
- 239000002250 absorbent Substances 0.000 title claims abstract description 31
- 239000000835 fiber Substances 0.000 claims abstract description 38
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 37
- 239000012510 hollow fiber Substances 0.000 claims abstract description 25
- 239000002245 particle Substances 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 5
- 229920000642 polymer Polymers 0.000 claims abstract description 3
- 239000006096 absorbing agent Substances 0.000 claims description 18
- 229920000247 superabsorbent polymer Polymers 0.000 claims description 5
- 238000009736 wetting Methods 0.000 abstract 1
- -1 polyethylene Polymers 0.000 description 10
- 210000002700 urine Anatomy 0.000 description 10
- 229920001155 polypropylene Polymers 0.000 description 8
- 239000004743 Polypropylene Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 210000001124 body fluid Anatomy 0.000 description 3
- 239000010839 body fluid Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004049 embossing Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 229920005653 propylene-ethylene copolymer Polymers 0.000 description 3
- 229920002994 synthetic fiber Polymers 0.000 description 3
- 239000012209 synthetic fiber Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- SGHZXLIDFTYFHQ-UHFFFAOYSA-L Brilliant Blue Chemical compound [Na+].[Na+].C=1C=C(C(=C2C=CC(C=C2)=[N+](CC)CC=2C=C(C=CC=2)S([O-])(=O)=O)C=2C(=CC=CC=2)S([O-])(=O)=O)C=CC=1N(CC)CC1=CC=CC(S([O-])(=O)=O)=C1 SGHZXLIDFTYFHQ-UHFFFAOYSA-L 0.000 description 1
- 229920002785 Croscarmellose sodium Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- LLSDKQJKOVVTOJ-UHFFFAOYSA-L calcium chloride dihydrate Chemical compound O.O.[Cl-].[Cl-].[Ca+2] LLSDKQJKOVVTOJ-UHFFFAOYSA-L 0.000 description 1
- 229940052299 calcium chloride dihydrate Drugs 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000001767 crosslinked sodium carboxy methyl cellulose Substances 0.000 description 1
- 235000010947 crosslinked sodium carboxy methyl cellulose Nutrition 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- WRUGWIBCXHJTDG-UHFFFAOYSA-L magnesium sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Mg+2].[O-]S([O-])(=O)=O WRUGWIBCXHJTDG-UHFFFAOYSA-L 0.000 description 1
- 229940061634 magnesium sulfate heptahydrate Drugs 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002074 melt spinning Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Absorbent Articles And Supports Therefor (AREA)
Abstract
Description
本発明は、使い捨ておむつ、パンツあるいは生理用品、尿取りパッド、ペット用シートなどの吸収性物品に関する。さらに詳しくは、透水性を有する中空繊維不織布が吸収性物品の中のトップシート、セカンドシートまたは吸収体を包むコアラップに使用された吸収性物品に関する。 The present invention relates to absorbent articles such as disposable diapers, pants or sanitary products, urine collection pads, and pet sheets. More specifically, the present invention relates to an absorbent article in which a hollow fiber nonwoven fabric having water permeability is used for a core sheet that wraps a top sheet, a second sheet, or an absorbent body in the absorbent article.
使い捨ておむつや生理用品といった一般的な吸収性物品は、表側（肌に接する側）を覆う透液性トップシートと、繊維集合体に高吸収性ポリマー粒子を混入してなる吸収体層および吸収体を包むコアラップと、吸収体の裏側を覆う液不透過性シートとを基本構成としている（例えば特許文献１参照）。また最近では、トップシートと吸収体との間に、いわゆる逆戻りを防止するために中間シート（セカンドシートともいわれる）を設けることも一般的となっている。 General absorbent articles, such as disposable diapers and sanitary products, include a liquid-permeable top sheet that covers the front side (side that contacts the skin), and an absorbent layer and an absorbent body in which superabsorbent polymer particles are mixed into a fiber assembly. And a liquid-impermeable sheet that covers the back side of the absorber (see, for example, Patent Document 1). Recently, it is also common to provide an intermediate sheet (also referred to as a second sheet) between the top sheet and the absorber to prevent so-called reversal.
しかしながら、本発明者らの検討によれば、尿や体液が吸収体層から肌側に逆戻りする、いわゆるリウェットの防止性能には依然改善の余地があった。 However, according to the study by the present inventors, there is still room for improvement in the so-called rewetting prevention performance in which urine and body fluid return to the skin side from the absorber layer.
本発明者らは、中空繊維からなる長繊維不織布をトップシート、セカンドシートまたはコアラップとして用いると、リウェット性能が著しく改善されることを見出し、本発明を完成させた。
すなわち本発明は以下に関する：
［１］
高吸収性ポリマー粒子を含む吸収体層と、前記吸収体層の少なくとも片側に位置する透液性層が積層されてなる吸収性物品であって、前記透液性層は、中空繊維を含む長繊維不織布を含んでなり、前記長繊維不織布は中空繊維からなることを特徴とする吸収性物品。
［２］
前記中空繊維は、親水化剤を含む［1］記載の吸収性物品。
［３］
前記透液性層は、トップシート、セカンドシート、又はコアラップから選ばれる少なくとも１種である［1］または［2］記載の吸収性物品。
［４］
前記中空繊維は、下記（ａ）〜（ｃ）の要件を満たすプロピレン系重合体の中空繊維からなることを特徴とする［1］ないし［3］いずれかに記載の吸収性物品。
（ａ）Ｃ軸配向度が少なくとも０．８５、
（ｂ）平均繊維径が５〜２０μｍ、
（ｃ）中空率が５〜３０％
The present inventors have found that the rewetting performance is remarkably improved when a long fiber nonwoven fabric made of hollow fibers is used as a top sheet, a second sheet or a core wrap, and the present invention has been completed.
That is, the present invention relates to:
[1]
An absorbent article in which an absorbent layer containing superabsorbent polymer particles and a liquid-permeable layer located on at least one side of the absorber layer are laminated, and the liquid-permeable layer is a long piece containing hollow fibers. An absorbent article comprising a fiber nonwoven fabric, wherein the long fiber nonwoven fabric comprises hollow fibers.
[2]
The absorbent article according to [1], wherein the hollow fiber includes a hydrophilizing agent.
[3]
The absorbent article according to [1] or [2], wherein the liquid-permeable layer is at least one selected from a top sheet, a second sheet, and a core wrap.
[4]
The absorbent article according to any one of [1] to [3], wherein the hollow fiber is a hollow fiber of a propylene polymer that satisfies the following requirements (a) to (c).
(A) the degree of C-axis orientation is at least 0.85,
(B) an average fiber diameter of 5 to 20 μm,
(C) Hollow ratio is 5 to 30%
本発明によれば、尿や体液が吸収体層から肌側に逆戻りするリウェットを効果的に防止することが出来る。 According to the present invention, it is possible to effectively prevent rewet from returning from the absorber layer to the skin side of urine and body fluid.
＜透液性層＞
本発明の透液性層は尿や体液を透過する液透過性を有し、長繊維不織布を含んでなる。
本発明の長繊維不織布は透液性を有し、不織布を形成する繊維は中空であればよく、原料樹脂が何であるかは特に限定されない。ポリエチレンやポリプロピレン等のオレフィン系、ポリエステル系、ポリアミド系等の合成繊維、などを例示することができるが、中でもポリプロピレンからなる中空不織布が好ましい。
不織布は、どのような加工によって製造されたものであってもよいが、スパンボンド法が、好ましい。
<Liquid permeable layer>
The liquid-permeable layer of the present invention has liquid permeability that allows urine and body fluid to permeate, and comprises a long fiber nonwoven fabric.
The long-fiber non-woven fabric of the present invention has liquid permeability, and the fibers forming the non-woven fabric may be hollow, and what is the raw material resin is not particularly limited. Examples include olefins such as polyethylene and polypropylene, synthetic fibers such as polyesters and polyamides, and the like. Among these, a hollow nonwoven fabric made of polypropylene is preferable.
The nonwoven fabric may be produced by any processing, but the spunbond method is preferable.
中空繊維からなる不織布としては、例えばＷＯ２０１２／１１１７２３号、ＷＯ２０１０／２４２６８号、ＷＯ２００９／６３８９２号の各国際公開パンフレットに記載のものを用いることができる。 As a nonwoven fabric which consists of hollow fibers, the thing as described in each international publication pamphlet of WO2012 / 111723, WO2010 / 24268, and WO2009 / 63892 can be used, for example.
中空繊維の中空部は繊維内の中心部にあっても良いし、中空部が偏芯した偏芯中空複合繊維であってもよい。偏芯中空複合繊維であると、嵩高性に優れた長繊維不織布を得ることができる。 The hollow portion of the hollow fiber may be in the center of the fiber, or may be an eccentric hollow composite fiber in which the hollow portion is eccentric. When it is an eccentric hollow composite fiber, a long fiber nonwoven fabric excellent in bulkiness can be obtained.
ポリプロピレンからなる中空不織布としては、（ｂ）平均繊維径が５〜２０μｍ、好ましくは５〜１７μｍの範囲にあることが好ましい。ポリプロピレンからなる中空不織布は、その（ｃ）中空率が通常５〜３０％、好ましくは１０〜３０％、さらに好ましくは１４〜３０％の範囲にある。
ポリプロピレンからなる中空不織布としては、（ａ）Ｃ軸配向度が少なくとも０．８５、好ましくは０．９以上の範囲にあることが好ましい。
The hollow nonwoven fabric made of polypropylene (b) has an average fiber diameter of 5 to 20 μm, preferably 5 to 17 μm. The hollow nonwoven fabric made of polypropylene has a (c) hollowness of usually 5 to 30%, preferably 10 to 30%, more preferably 14 to 30%.
As the hollow nonwoven fabric made of polypropylene, (a) the degree of C-axis orientation is preferably at least 0.85, preferably 0.9 or more.
また中空不織布を形成するポリプロピレンとしては、
メルトフローレート（ＡＳＴＭ ｄ−１２３８，２３０℃，荷重２．１６ｋｇ）が１０〜１００g/10min、好ましくは２０〜７０g/10minの範囲にあるものが好ましい
Ｚ平均分子量（Ｍｚ）と重量平均分子量（Ｍｗ）との比（Ｍｚ／Ｍｗ）が１．５〜１．９の範囲にあるプロピレン系重合体からなり、繊維径が１５〜２４μｍ及び中空率が２５〜３０％の中空断面を有する中空繊維からなる長繊維不織布を用いることもできる。
このような中空不織布は特許5181028号に記載されている。
Moreover, as a polypropylene which forms a hollow nonwoven fabric,
It is preferable that the melt flow rate (ASTM d-1238, 230 ° C., load 2.16 kg) is in the range of 10 to 100 g / 10 min, preferably 20 to 70 g / 10 min. Z average molecular weight (Mz) and weight average molecular weight (Mw) ) And a hollow fiber having a hollow cross section with a fiber diameter of 15 to 24 μm and a hollow ratio of 25 to 30% (Mz / Mw) in the range of 1.5 to 1.9. It is also possible to use a long fiber nonwoven fabric.
Such a hollow nonwoven fabric is described in Japanese Patent No. 5181028.
本発明の中空繊維が優れたリウェット低減効果を示す理由としては、得られた中空繊維が圧縮されにくいことに起因すると推測している。本発明の中空繊維は、圧縮特性の指標としてカトーテック（株）製のＫＥＳ−ＦＢシステムにより評価した、圧縮回復性を意味するRC値および圧縮かたさを意味するLC値が高いことが好ましい。 The reason why the hollow fiber of the present invention exhibits an excellent rewetting reduction effect is presumed to be that the obtained hollow fiber is difficult to be compressed. The hollow fiber of the present invention preferably has a high RC value, which means compression recovery, and a high LC value, which is evaluated by a KES-FB system manufactured by Kato Tech Co., Ltd. as an index of compression characteristics.
本発明の中空繊維は、親水化剤を含むことが好ましい。
親水化処理は表面に塗布しても、溶融紡糸の際に錬り込んでもよい。
親水化剤としては、ノニオン系界面活性化剤、アニオン系界面活性化剤、カチオン系界面活性化剤を用いることができる。
他にも添加剤として、酸化防止剤、対候安定剤、ブロックキング防止剤、核剤、顔料等を含んでもよい。
The hollow fiber of the present invention preferably contains a hydrophilizing agent.
The hydrophilic treatment may be applied to the surface or kneaded during melt spinning.
As the hydrophilizing agent, a nonionic surfactant, an anionic surfactant, or a cationic surfactant can be used.
In addition, antioxidants, weather stabilizers, anti-blocking agents, nucleating agents, pigments and the like may be included as additives.
本発明の透液性層は後述する吸収体層よりも着用者側に位置し、
トップシート又はセカンドシート、又はコアラップとして用いられる。
トップシートは表側に位置し、着用者側に接するシートを言う。
セカンドシートは、トップシートと吸収体層の間に位置するシートを言う。
コアラップは、吸収体層を周回して覆うシート材を言う。
本発明の透液性層はトップシート又はセカンドシート、又はコアラップから選ばれる部材の少なくとも１以上に用いることができ、または２以上として用いてもよく、すべてに用いても良い。
The liquid-permeable layer of the present invention is located closer to the wearer than the absorber layer described later,
Used as a top sheet, a second sheet, or a core wrap.
The top sheet is a sheet located on the front side and in contact with the wearer side.
The second sheet refers to a sheet positioned between the top sheet and the absorber layer.
The core wrap refers to a sheet material that surrounds and covers the absorber layer.
The liquid-permeable layer of the present invention can be used for at least one member selected from a top sheet, a second sheet, or a core wrap, or may be used as two or more members, or may be used for all.
＜吸収体層＞
本発明の吸収体層は、高吸収性ポリマー粒子を含む繊維の集合体より形成される。
この繊維集合体としては、天然ないし人工パルプや合成繊維等の短繊維を積繊したものの他、セルロースアセテート等の合成繊維束を開繊して得られるフィラメント集合体も使用できる。
<Absorber layer>
The absorbent layer of the present invention is formed from an aggregate of fibers containing superabsorbent polymer particles.
As this fiber assembly, filament aggregates obtained by opening a synthetic fiber bundle such as cellulose acetate can be used in addition to those obtained by stacking short fibers such as natural or artificial pulp or synthetic fiber.
高吸収性ポリマー粒子（ＳＡＰ粒子）としては、平均粒径が１０μｍから１０００μｍ以下の粒子ないし粉体が用いられる。
ＳＡＰ粒子の材料は、アクリル酸（塩）重合体や、でんぷん系、セルロース系、でんぷん−アクリル酸（塩）グラフト共重合体、でんぷん−アクリロニトリル共重合体のケン化物、ナトリウムカルボキシメチルセルロースの架橋物やなどが用いられる。
ＳＡＰ粒子は繊維の厚み方向全体に分散されているものが望ましい。
As the superabsorbent polymer particles (SAP particles), particles or powders having an average particle size of 10 μm to 1000 μm are used.
SAP particles are made of acrylic acid (salt) polymer, starch-based, cellulose-based, starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, cross-linked sodium carboxymethyl cellulose, Etc. are used.
The SAP particles are desirably dispersed throughout the fiber thickness direction.
＜積層体＞
本発明の吸収性物品は、前述した吸収体層と透液性層が少なくとも積層されてなる。
透液性層は着用者側、肌側に用いられる。吸収体層と透液性層は必ずしも接していなくとも良く、
トップシート／セカンドシート／コアラップ／＜吸収体層＞
のいずれに用いてもよい。
透液性層（トップシート）／吸収体層
トップシート／透液性層（セカンドシート）／吸収体層
トップシート／セカンドシート／透液性層（コアラップ）／吸収体層
のような構造でもよく、さらに上記トップシート／セカンドシート／コアラップの２以上に用いてもよい
さらに、後述する液不透過性シート層を備えてもよい。
<Laminate>
The absorbent article of the present invention is formed by laminating at least the absorber layer and the liquid-permeable layer described above.
The liquid-permeable layer is used on the wearer side and the skin side. The absorber layer and the liquid-permeable layer do not necessarily have to be in contact with each other,
Top sheet / second sheet / core wrap / <absorber layer>
Any of these may be used.
Structures such as liquid-permeable layer (top sheet) / absorber layer top sheet / liquid-permeable layer (second sheet) / absorber layer top sheet / second sheet / liquid-permeable layer (core wrap) / absorber layer Further, it may be used for two or more of the top sheet / second sheet / core wrap, and may further include a liquid-impermeable sheet layer described later.
＜吸収体層の裏側を覆う液不透過性シート＞
本発明の液不透過性シートは吸収体層の裏側（透液性層と反対側）を覆い、液漏れを防止するもので、バックシートともいう。
液不透過性シートの素材は、特に限定されるものではないが、例えば、ポリエチレンやポリプロピレン等のオレフィン系樹脂や、ポリオレフィンシートや防水フィルムを積層して液不透過性とした不織布などを例示することができる。
<Liquid impervious sheet covering the back side of the absorber layer>
The liquid-impermeable sheet of the present invention covers the back side of the absorber layer (the side opposite to the liquid-permeable layer) to prevent liquid leakage, and is also referred to as a back sheet.
The material of the liquid-impermeable sheet is not particularly limited, and examples thereof include olefin-based resins such as polyethylene and polypropylene, and nonwoven fabrics that are liquid-impermeable by laminating polyolefin sheets and waterproof films. be able to.
以下、実施例に基づいて本発明をさらに具体的に説明するが、本発明はこれらの実施例に限定されるものではない。
なお、実施例及び比較例における物性値等は、以下の方法により測定した。
EXAMPLES Hereinafter, although this invention is demonstrated further more concretely based on an Example, this invention is not limited to these Examples.
In addition, the physical-property value in an Example and a comparative example was measured with the following method.
（１）繊維径［μm］
スパンボンド不織布をエポキシ樹脂に包埋して、次いでミクロトームで切断し、試料片を得る。これを電子顕微鏡〔（株）日立製作所製Ｓ−３５００Ｎ形 走査型電子顕微鏡〕で観察し、得られた断面像より観察された繊維断面像のおける繊維の外径から繊維径を測定した
(1) Fiber diameter [μm]
A spunbond nonwoven fabric is embedded in an epoxy resin and then cut with a microtome to obtain a sample piece. This was observed with an electron microscope (S-3500N scanning electron microscope manufactured by Hitachi, Ltd.), and the fiber diameter was measured from the outer diameter of the fiber in the fiber cross-sectional image observed from the obtained cross-sectional image.
（２）中空率［％］
スパンボンド不織布をエポキシ樹脂に包埋して、次いでミクロトームで切断し、試料片を得る。これを電子顕微鏡〔（株）日立製作所製Ｓ−３５００Ｎ形 走査型電子顕微鏡〕で観察し、得られた断面像より観察された繊維断面像のおける繊維全体の断面積と中空部断面積を求め、以下の式より算出した。
中空率［％］＝（中空部の断面積／繊維全体の断面積）×１００
中空率の値は繊維１００本を測定した平均値とした。
(2) Hollow ratio [%]
A spunbond nonwoven fabric is embedded in an epoxy resin and then cut with a microtome to obtain a sample piece. This was observed with an electron microscope (S-3500N scanning electron microscope manufactured by Hitachi, Ltd.), and the cross-sectional area of the entire fiber and the cross-sectional area of the hollow part in the fiber cross-sectional image observed from the obtained cross-sectional image were obtained. It was calculated from the following formula.
Hollow ratio [%] = (Cross sectional area of hollow part / Cross sectional area of entire fiber) × 100
The value of the hollowness was an average value obtained by measuring 100 fibers.
（３）目付け（ｇ／ｍ2）
不織布の任意の位置から１００ｍｍ×１００ｍｍの試料を１０枚採取し、それぞれの質
量（ｇ）を測定した。それらの平均値を求め、１ｍ2当りの質量に換算して目付け（ｇ／
ｍ2）とした。
(3) Weight per unit (g / m2)
Ten samples of 100 mm × 100 mm were taken from an arbitrary position of the nonwoven fabric, and each mass (g) was measured. The average value of them is calculated and converted to mass per square meter (g /
m2).
（４）リウェット量［g］
イオン交換水１０ｋｇに対し、尿素２００ｇ、塩化ナトリウム８０ｇ、硫酸マグネシウム・７水和物８ｇ、塩化カルシウム・２水和物３ｇ、色素（青色１号）１ｇを混合させることで人口尿を作成した。リウェット量は人口尿を用いて以下の通り実施した。
(4) Rewet amount [g]
An artificial urine was prepared by mixing 10 g of ion-exchanged water with 200 g of urea, 80 g of sodium chloride, 8 g of magnesium sulfate heptahydrate, 3 g of calcium chloride dihydrate, and 1 g of a pigment (blue No. 1). Rewetting was performed as follows using artificial urine.
各実施例で得られたスパンボンド不織布を長さ１５０ｍｍ×幅１２０ｍｍのサイズに切り、その質量（Ｔ1（ｇ））を測定した後、吸収体上に載せ、軽く押さえてトップシートとした。
円筒（直径６０ｍｍ，重さ２００ｇ）をトップシートの中央部に設置した。ピペットを、その先端とトップシートとの間隔が１０ｍｍとなるように、トップシートの上方に設置し、１６０ｍＬ／２０秒の滴下速度で、ピペットからトップシートへ人工尿を滴下した。人工尿滴下開始５分後に、予め質量（Ａ（ｇ））を測定した濾紙（アドバンテックＮｏ．２，１００ｍｍ×１００ｍｍ）を、濾紙の中央と人工尿滴下位置とが一致するようにトップシート上に設置し、その上に錘（５ｋｇ／１００ｃｍ2）を設置した。人工尿滴下開始８分後（錘を設置してから３分後）、錘を外して濾紙の質量（Ｂ（ｇ））を測定した。濾紙の質量の変化量（Ｂ（ｇ）−Ａ（ｇ））を算出した。同様の測定を５回繰り返し、その平均値をリウェット量とした。
The spunbonded nonwoven fabric obtained in each example was cut into a size of 150 mm long × 120 mm wide, and its mass (T1 (g)) was measured. Then, it was placed on the absorbent and lightly pressed to obtain a top sheet.
A cylinder (diameter 60 mm, weight 200 g) was placed in the center of the top sheet. The pipette was placed above the top sheet so that the distance between the tip and the top sheet was 10 mm, and artificial urine was dropped from the pipette to the top sheet at a dropping rate of 160 mL / 20 seconds. 5 minutes after the start of artificial urine dripping, filter paper (Advantech No. 2,100 mm × 100 mm) whose mass (A (g)) was measured in advance is placed on the top sheet so that the center of the filter paper coincides with the artificial urine dripping position. Then, a weight (5 kg / 100 cm 2) was placed thereon. 8 minutes after the start of dropping artificial urine (3 minutes after the weight was set), the weight was removed and the mass (B (g)) of the filter paper was measured. The amount of change in the mass of the filter paper (B (g) -A (g)) was calculated. The same measurement was repeated 5 times, and the average value was defined as the rewet amount.
（５）RC値、LC値
カトーテック（株）製のＫＥＳ−ＦＢシステムにより、圧縮特性であるRC値およびLC値を測定した。
(5) RC value, LC value RC value and LC value which are compression characteristics were measured with the KES-FB system made from Kato Tech.
〔実施例１〕
荷重２１６０ｇ、２３０℃のＭＦＲが６０ｇ／１０分、融点（Tm）が１４２℃のプロピレン・エチレン共重合体（ＰＰ−１）に、化学式Ｒ−ＣＯＯ−（Ｃｎ Ｈ2ｎ Ｏ）ｘ −ＣＯ−Ｒで表されるポリアルキレングリコールのジ飽和脂肪酸エステルを３重量部添加させ、（式中、Ｒは炭素数が１３〜１７のアルキル基であり、（Ｃｎ Ｈ2ｎ Ｏ）ｘ のｎは２〜４の整数であり、ｘは１０〜２３である。）、押出機（スクリュー径７５ｍｍφ）により成形温度２２０℃で溶融し、ノズルピッチが縦方向４．５ｍｍ、横方向４．０ｍｍ、図１に示すような孔形状を有し、図２の繊維断面となる紡糸口金を配置した図３に示すような不織布製造装置（スパンボンド成形機、捕集面上の機械の流れ方向に垂直な方向の長さ：６５６ｍｍ）を用いて、冷却流体に（２５℃、流量：３３Ｎｍ３/分/ｍ）のエアーを用い、スパンボンド法によりＰＰ−１の単孔吐出量を（０．５２ｇ／分）、糸速度：（３４３１ｍ／分）で紡糸し、捕集ベルト上に堆積させ、次いで、これをエンボスロールで加熱加圧処理（エンボス面積率：１８％、エンボス温度：１２２℃）し、目付量が１８ｇ／ｍ2になるように捕集ベルトの運転速度を調節し、目付量が１８ｇ／ｍ2のスパンボンド不織布を得た。
[Example 1]
A propylene-ethylene copolymer (PP-1) having a load of 2160 g, an MFR of 230 ° C. of 60 g / 10 minutes and a melting point (Tm) of 142 ° C. is represented by the chemical formula R—COO— (Cn H 2 n O) x —CO—R. 3 parts by weight of the disaturated fatty acid ester of polyalkylene glycol represented is added, wherein R is an alkyl group having 13 to 17 carbon atoms, and n in (Cn H2n O) x is an integer of 2 to 4. And x is 10 to 23), melted at an molding temperature of 220 ° C. by an extruder (screw diameter 75 mmφ), and the nozzle pitch is 4.5 mm in the vertical direction and 4.0 mm in the horizontal direction, as shown in FIG. Nonwoven fabric manufacturing apparatus as shown in FIG. 3 having a hole shape and having a spinneret having a fiber cross section of FIG. 2 (span bond molding machine, length in the direction perpendicular to the machine flow direction on the collecting surface: 656 mm), cooling fluid (25 ° C, flow rate: 33 Nm3 / min / m) Using a spunbond method, the PP-1 single-hole discharge rate was spun at (0.52 g / min) and the yarn speed: (3431 m / min), It is deposited on the collecting belt, and then heated and pressurized with an embossing roll (embossing area ratio: 18%, embossing temperature: 122 ° C.), and the weight of the collecting belt is adjusted so that the basis weight is 18 g / m 2 . The operating speed was adjusted to obtain a spunbonded nonwoven fabric having a basis weight of 18 g / m 2 .
なお、図３において、付番１は押出機、付番２は紡糸口金、付番３は中空繊維、付番４は冷却風、付番５はディフューザー、付番６は捕捉装置、付番７は吸引装置、付番８はウェブ（スパンボンド不織布）である。 In FIG. 3, number 1 is an extruder, number 2 is a spinneret, number 3 is a hollow fiber, number 4 is cooling air, number 5 is a diffuser, number 6 is a trapping device, number 7 Is a suction device, and number 8 is a web (spunbond nonwoven fabric).
得られたフィラメントおよびスパンボンド不織布について、繊維径、中空率、リウェット量を測定して評価した。結果を表１に示す。
〔実施例２〕
捕集ベルトの運転速度以外は実施例１と同様の方法で、目付量が２５ｇ／ｍ2のスパンボンド不織布を得た。得られたフィラメントおよびスパンボンド不織布について、繊維径、中空率、リウェット量を測定して評価した。結果を表１に示す。
About the obtained filament and the spunbonded nonwoven fabric, the fiber diameter, the hollow ratio, and the rewet amount were measured and evaluated. The results are shown in Table 1.
[Example 2]
A spunbonded nonwoven fabric having a basis weight of 25 g / m 2 was obtained in the same manner as in Example 1 except for the operation speed of the collection belt. About the obtained filament and the spunbonded nonwoven fabric, the fiber diameter, the hollow ratio, and the rewet amount were measured and evaluated. The results are shown in Table 1.
〔比較例１〕
スパンボンド法により紡糸口金（中実繊維用）としてΦ０．６ｍｍの円孔を使用し、糸速度：（３４３１ｍ／分）で、空孔の無い中実繊維を紡糸した以外は実施例１と同様の方法で目付量が１８ｇ／ｍ2のスパンボンド不織布を得た。
得られたフィラメントおよびスパンボンド不織布について、繊維径、リウェット量を測定して評価した。結果を表１に示す。
[Comparative Example 1]
Similar to Example 1 except that a Φ0.6 mm circular hole was used as a spinneret (for solid fibers) by the spunbond method, and solid fibers without holes were spun at a yarn speed of (3431 m / min). A spunbonded nonwoven fabric having a basis weight of 18 g / m 2 was obtained by the above method.
About the obtained filament and the spunbonded nonwoven fabric, the fiber diameter and the rewet amount were measured and evaluated. The results are shown in Table 1.
〔比較例２〕
捕集ベルトの運転速度以外は比較例１と同様の方法で、目付量が２５ｇ／ｍ2のスパンボンド不織布を得た。得られたフィラメントおよびスパンボンド不織布について、繊維径、中空率、リウェット量を測定して評価した。結果を表１に示す。
[Comparative Example 2]
A spunbonded nonwoven fabric having a basis weight of 25 g / m 2 was obtained in the same manner as in Comparative Example 1 except for the operation speed of the collecting belt. About the obtained filament and the spunbonded nonwoven fabric, the fiber diameter, the hollow ratio, and the rewet amount were measured and evaluated. The results are shown in Table 1.
本発明によれば、リウェット性能が著しく改善された吸収性物品が提供される。 According to the present invention, an absorbent article with significantly improved rewetting performance is provided.
１ 押出機、
２ 紡糸口金、
３ 中空繊維、
４ 冷却風、
５ ディフューザー、
６ 捕捉装置、
７ 吸引装置、
８ ウェブ（スパンボンド不織布）
1 Extruder,
2 Spinneret,
3 hollow fiber,
4 Cooling air,
5 Diffuser,
6 Capture device,
7 suction device,
8 Web (spunbond nonwoven fabric)
Claims (4)
（ａ）Ｃ軸配向度が少なくとも０．８５
（ｂ）平均繊維径が５〜２０μｍ
（ｃ）中空率が５〜３０％
The said hollow fiber consists of a hollow fiber of the propylene-type polymer which satisfy | fills each requirements of following (a)-(c), The absorbent article in any one of Claim 1 thru | or 3 characterized by the above-mentioned.
(A) C-axis orientation degree of at least 0.85
(B) An average fiber diameter of 5 to 20 μm
(C) Hollow ratio is 5 to 30%
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| JP2018016168A JP2019130159A (en) | 2018-02-01 | 2018-02-01 | Absorbent article |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018016168A JP2019130159A (en) | 2018-02-01 | 2018-02-01 | Absorbent article |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001123366A (en) * | 1999-10-19 | 2001-05-08 | Chisso Corp | Stretched nonwoven fabric and molded article using the same |
| WO2012111723A1 (en) * | 2011-02-15 | 2012-08-23 | 三井化学株式会社 | Spunbonded nonwoven fabric |
| JP2015132038A (en) * | 2013-12-12 | 2015-07-23 | 花王株式会社 | Long fiber nonwoven fabric |
| JP2018000525A (en) * | 2016-06-30 | 2018-01-11 | ユニ・チャーム株式会社 | Absorbent article |
-
2018
- 2018-02-01 JP JP2018016168A patent/JP2019130159A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001123366A (en) * | 1999-10-19 | 2001-05-08 | Chisso Corp | Stretched nonwoven fabric and molded article using the same |
| WO2012111723A1 (en) * | 2011-02-15 | 2012-08-23 | 三井化学株式会社 | Spunbonded nonwoven fabric |
| JP2015132038A (en) * | 2013-12-12 | 2015-07-23 | 花王株式会社 | Long fiber nonwoven fabric |
| JP2018000525A (en) * | 2016-06-30 | 2018-01-11 | ユニ・チャーム株式会社 | Absorbent article |
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