JP5829326B1 - Nonwoven fabric for absorbent articles - Google Patents
Nonwoven fabric for absorbent articles Download PDFInfo
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- JP5829326B1 JP5829326B1 JP2014266742A JP2014266742A JP5829326B1 JP 5829326 B1 JP5829326 B1 JP 5829326B1 JP 2014266742 A JP2014266742 A JP 2014266742A JP 2014266742 A JP2014266742 A JP 2014266742A JP 5829326 B1 JP5829326 B1 JP 5829326B1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
- A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
- A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
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- Health & Medical Sciences (AREA)
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- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Nonwoven Fabrics (AREA)
Abstract
【課題】本発明の技術的課題は、肌に接触した際に柔軟な肌触りを常に確保することができる吸収性物品用の不織布を得る。【解決手段】隣り合う凸部４，４の間の空間に設けられた溝部５の溝底部６に、溝底部６よりも深い底部９を有し、且つ第１方向Ｘに対して不連続に設けられた複数の凹部７を備え、凹部７の周面の少なくとも一部が、第２面側に通じる孔部１１を備えていて、孔部１１は、熱可塑性樹脂繊維を溶融することなく形成された周縁部１２を有し、周縁部１２には、熱可塑性樹脂繊維のうち、破断により形成された破断繊維１３の破断端部１３ａが含まれている構成とする。【選択図】図２The technical problem of the present invention is to obtain a nonwoven fabric for absorbent articles that can always ensure a soft touch when it comes into contact with the skin. A groove bottom 6 of a groove 5 provided in a space between adjacent convex portions 4 and 4 has a bottom 9 deeper than the groove bottom 6 and is discontinuous with respect to a first direction X. Provided with a plurality of recessed portions 7 provided, at least a part of the peripheral surface of the recessed portion 7 includes a hole portion 11 communicating with the second surface side, and the hole portion 11 is formed without melting the thermoplastic resin fiber. It is set as the structure which has the edge part 13a of the fracture | rupture fiber 13 formed by the fracture | rupture among the thermoplastic resin fibers. [Selection] Figure 2
Description
本発明は、使い捨ておむつや生理用ナプキン、失禁パッド等の吸収性物品に使用される不織布に関するものである。 The present invention relates to a nonwoven fabric used for absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads.
例えば使い捨ておむつ等の吸収性物品において、トップシート等の構成部材として用いられる不織布は、使用者の肌に触れる部分であることから、柔軟で肌触りが良いことが大きな条件となる。
そのため、近年では、肌と接触する面に、複数列の畝状の凸部と、隣接する凸部の間の空間に設けられた溝部とが設けられた不織布が用いられることが多くなっているが、このような不織布は、比較的柔軟な凸部が肌に接触し、またその凸部が肌面にフィットし易いため、不織布の柔軟性を感じ易い傾向にある。
For example, in an absorbent article such as a disposable diaper, a nonwoven fabric used as a constituent member such as a top sheet is a part that touches the user's skin.
Therefore, in recent years, a nonwoven fabric provided with a plurality of rows of ridge-shaped protrusions and grooves provided in a space between adjacent protrusions on the surface in contact with the skin is often used. However, such a nonwoven fabric tends to feel the flexibility of the nonwoven fabric because the relatively flexible convex portion comes into contact with the skin and the convex portion easily fits the skin surface.
この種の不織布の中には、柔軟性をより向上させるため、例えば特許文献１に記載されているように、凸部の間の溝部内に不織布の厚さ方向に貫通する貫通孔を設けた構成のものが存在する。この特許文献１に記載の不織布は、貫通孔により凸部の動きの自由度や、繊維の動きの自由度が向上するため、肌の動きに合わせて凸部や繊維が追従して該凸部の柔軟性をより感じ易くなることから、肌触りがより良く感じ易い傾向にある。
しかしながら、この特許文献１に記載の不織布は、溝部に貫通孔を形成する工程において、不織布中の熱可塑性樹脂繊維を溶融させながら、貫通孔形成用のピンロールに設けられたピンを不織布の厚さ方向に貫通させることにより貫通孔を形成するため、貫通孔の周縁が溶融によって硬化し易い。
そのため、肌が不織布に接触した際、特に、不織布を厚さ方向に押圧した場合や、不織布の平面方向に肌を滑らせた場合には、貫通孔の周縁の硬い部分が肌に当たって著しい違和感を感じさせる可能性があり、不織布の肌触りを大きく損ねることが考えられる。
In this type of nonwoven fabric, in order to further improve the flexibility, for example, as described in Patent Document 1, a through-hole penetrating in the thickness direction of the nonwoven fabric is provided in the groove portion between the convex portions. There is a configuration. In the nonwoven fabric described in Patent Document 1, the degree of freedom of movement of the convex part and the degree of freedom of movement of the fiber are improved by the through-hole, so that the convex part and the fiber follow the movement of the skin. Since it becomes easier to feel the flexibility, the touch tends to be better felt.
However, in the nonwoven fabric described in Patent Document 1, in the step of forming the through-hole in the groove portion, the pin provided on the pin roll for forming the through-hole is used while the thermoplastic resin fiber in the nonwoven fabric is melted. Since the through hole is formed by penetrating in the direction, the periphery of the through hole is easily cured by melting.
Therefore, when the skin comes into contact with the nonwoven fabric, especially when the nonwoven fabric is pressed in the thickness direction, or when the skin is slid in the plane direction of the nonwoven fabric, the hard part of the periphery of the through-hole hits the skin, and there is a noticeable discomfort. There is a possibility of making it feel, and it is considered that the touch of the nonwoven fabric is greatly impaired.
本発明の技術的課題は、肌に接触した際に柔軟な肌触りを常に確保することができる吸収性物品用の不織布を提供することにある。 The technical subject of this invention is providing the nonwoven fabric for absorbent articles which can always ensure a soft touch when it contacts skin.
吸収性物品用の不織布の柔軟性に関して、本発明者らが鋭意研究を重ねた結果、吸収性物品を使用者が使用した際、あるいは吸収性物品に係る商品を選定するに際して、使用者が触って柔らかいと感じるのは、大きく２つの要素が関係していることを見い出した。即ち、肌で不織布を厚さ方向に押した際に感じる硬さ・柔らかさ（硬軟感）と、肌を不織布の平面方向に滑らせた際に感じる、ざらつきあるいは滑らかさ（粗滑感）とが、不織布の柔軟性の評価に大きく関係していることがわかった。
これにより、本発明者らは、不織布に対する柔軟な肌触りを常に確保するためには、これらの硬軟感と粗滑感の両方を両立させることが肝要であるとの知見を得た。
As a result of the inventors' extensive research on the flexibility of the nonwoven fabric for absorbent articles, the user touches the absorbent article when the absorbent article is used or when a product related to the absorbent article is selected. I found that there are two major factors that make me feel soft and soft. That is, the hardness and softness (hardness and softness) felt when the nonwoven fabric is pushed in the thickness direction with the skin, and the roughness or smoothness (coarse smoothness) felt when the skin is slid in the plane direction of the nonwoven fabric. However, it was found that this was greatly related to the evaluation of the flexibility of the nonwoven fabric.
As a result, the present inventors have obtained the knowledge that it is important to satisfy both the softness and the rough feeling in order to always ensure a soft touch to the nonwoven fabric.
本発明の吸収性物品用不織布は前記知見に基づいてなされたものであり、その構成は次の通りである。
（１）第１面と該第１面とは反対側の第２面とを有し、前記第１面側に突出する凸部と、前記第２面側に窪んだ溝部とを備えた、熱可塑性樹脂繊維を含む吸収性物品用の不織布であって、前記凸部は、前記不織布の面の第１方向に向けて延設されていると共に、前記不織布の面において前記第１方向と直交する第２方向に予め定めた間隔で複数列設けられ、
前記溝部は、前記第２方向に対して隣り合う前記凸部の間の空間に、前記第１方向に延設されていると共に、前記溝部の溝底部に、該溝部の溝底部よりも前記第２面側に位置する底部を有し、且つ前記第１方向に対して不連続に設けられた複数の凹部を備え、前記凹部は、該凹部の周面の少なくとも一部が、前記第２面に通じる孔部を備えていて、該孔部は、前記熱可塑性樹脂繊維を溶融することなく形成された周縁部を有していて、該周縁部には、前記熱可塑性樹脂繊維のうち、破断により形成された破断端部を備えた破断繊維の該破断端部が含まれている、吸収性物品用不織布。
The nonwoven fabric for absorbent articles of the present invention has been made on the basis of the above findings, and the configuration thereof is as follows.
(1) It has a first surface and a second surface opposite to the first surface, and includes a convex portion protruding toward the first surface side and a groove portion recessed toward the second surface side. A nonwoven fabric for absorbent articles containing thermoplastic resin fibers, wherein the convex portion extends in the first direction of the surface of the nonwoven fabric and is orthogonal to the first direction on the surface of the nonwoven fabric. A plurality of rows are provided at predetermined intervals in the second direction.
The groove portion extends in the first direction in a space between the convex portions adjacent to the second direction, and is closer to the groove bottom portion of the groove portion than the groove bottom portion of the groove portion. It has a bottom part located in the 2nd surface side, and is provided with a plurality of crevices provided discontinuously with respect to the 1st direction, and at least a part of the peripheral surface of the crevice is the 2nd above-mentioned crevice. A hole communicating with the surface, the hole has a peripheral edge formed without melting the thermoplastic resin fiber, and the peripheral edge includes, among the thermoplastic resin fibers, A nonwoven fabric for absorbent articles, comprising the broken end portion of a broken fiber having a broken end portion formed by breaking.
（２）前記凹部は、前記第１方向に沿うように形成された一対の第１周面と、前記第２方向に沿うように形成された一対の第２周面とを有し、前記孔部が前記第１周面の底部寄りの位置にのみ設けられている、前記（１）に記載の吸収性物品用不織布。
（３）前記孔部は、該孔部の内部空間内に、前記熱可塑性樹脂繊維の一部が架け渡されている前記（１）又は前記（２）に記載の吸収性物品用不織布。
(2) The recess has a pair of first peripheral surfaces formed along the first direction and a pair of second peripheral surfaces formed along the second direction, and the holes The nonwoven fabric for absorbent articles according to (1), wherein the portion is provided only at a position near the bottom of the first peripheral surface.
(3) The said hole part is a nonwoven fabric for absorbent articles as described in said (1) or said (2) in which a part of said thermoplastic resin fiber is spanned in the internal space of this hole part.
（４）前記凹部は、前記溝部の前記溝底部の第１面側の高さから底部の第１面側の高さまでの大きさが０．０５〜２ｍｍである、前記（１）〜（３）のいずれか１つに記載の吸収性物品用不織布。
（５）前記孔部は、前記内部空間の開孔口率が１〜５０％である、前記（１）〜（４）のいずれか１つに記載の吸収性物品用不織布。
（６）前記凸部は、隣接する他の凸部との間の間隔が０．２５〜５ｍｍである、前記（１）〜（５）のいずれか１つに記載の吸収性物品用不織布。
(4) The said recessed part is 0.05-2 mm in the magnitude | size from the height by the side of the 1st surface of the said groove bottom part of the said groove part to the height of the 1st surface side of a bottom part. The nonwoven fabric for absorbent articles according to any one of 3).
(5) The said hole part is a nonwoven fabric for absorbent articles as described in any one of said (1)-(4) whose open area ratio of the said internal space is 1 to 50%.
(6) The nonwoven fabric for absorbent articles according to any one of (1) to (5), wherein the convex portion has an interval between adjacent convex portions of 0.25 to 5 mm. .
本発明によれば、凸部間に設けられた溝部の溝底部に設けられた複数の凹部により、凸部や凸部の繊維の移動の自由度が増す上、凹部の孔部によって凸部の引張力が緩和されて凸部全体が柔らかくなるため、肌で不織布を厚さ方向に押した際には柔らかく感じ、また肌を不織布の平面方向に滑らせた際には滑らかさを感じることができる。また、凹部の孔部の周縁部は、繊維を溶融することなく形成され、且つ破断により形成された破断繊維の破断端部が含まれているため、硬軟感及び粗滑感をさらに向上（柔らかく、滑らか）させることができる。 According to the present invention, the plurality of concave portions provided in the groove bottom portion of the groove portion provided between the convex portions increases the degree of freedom of movement of the convex portions and the fibers of the convex portions, and the convex portions are formed by the hole portions of the concave portions. Since the tensile force is relaxed and the entire convex part becomes soft, it feels soft when the nonwoven fabric is pushed in the thickness direction with the skin, and it feels smooth when the skin is slid in the plane direction of the nonwoven fabric. it can. Moreover, since the peripheral part of the hole part of a recessed part is formed without melt | dissolving a fiber and the fracture | rupture end part of the fracture | rupture fiber formed by the fracture | rupture is contained, the softness and rough feeling are further improved (soften) , Smooth).
図１〜図４は、本発明の吸収性物品用不織布の一実施の形態を示すもので、この実施の形態の不織布１は、図１〜図４において第１面である上面２と、その上面２とは反対側の第２面である下面３とを有し、上面２側に突出する凸部４と、下面３側に窪んだ溝部５とを備えた、熱可塑性樹脂繊維を含む吸収性物品用のものである。
なお、本発明の不織布は、使い捨ておむつや生理用ナプキン、尿取りパット、パンティーライナー等の吸収性物品のトップシートや防漏壁、即ち、吸収性物品の使用者の肌と接する側に配設されるシートとして好適に用いられる。あるいは、使い捨ておむつ等のバックシートの外方側の面に貼り付けられるシートとしても用いられる。
1 to 4 show an embodiment of the nonwoven fabric for absorbent articles of the present invention. The nonwoven fabric 1 of this embodiment includes an upper surface 2 which is the first surface in FIGS. Absorption including thermoplastic resin fibers, having a lower surface 3 which is a second surface opposite to the upper surface 2, and having a convex portion 4 protruding toward the upper surface 2 and a groove portion 5 recessed toward the lower surface 3. It is for a property article.
In addition, the nonwoven fabric of the present invention is disposed on the top sheet or leak-proof wall of absorbent articles such as disposable diapers, sanitary napkins, urine pads, and panty liners, that is, the side of the absorbent article that contacts the user's skin It is suitably used as a sheet to be used. Or it is used also as a sheet | seat affixed on the surface of the outer side of back sheets, such as a disposable diaper.
不織布１は、材料となる加工前の不織布を、上面側及び下面側とに交互に折り返すことにより形成された略波型のシートで、この実施の形態においては、上面側において折り返された部分によって上方に凸となるように湾曲する凸部４が形成され、下面側において折り返された部分によって下方に凸となるように湾曲する溝部５が形成された構成となっている。
凸部４は、不織布１の面（シート面）の第１方向Ｘに向けて連続的に延設されていると共に、その不織布１の面における第１方向Ｘと直交する第２方向Ｙに予め定めた間隔で複数列設けられている。この実施の形態においては、各凸部４は、いずれも第１方向Ｘにむけて連続的に、且つ他の凸部４と相互にほぼ平行となるように延設されている。
一方、溝部５は、第２方向Ｙに対して隣り合う凸部４，４の間の空間に、第１方向Ｘに延びるように設けられていて、凸部４の頂部よりも下面側に窪んだ溝底部６を有している。
The non-woven fabric 1 is a substantially wave-shaped sheet formed by alternately folding a non-woven fabric before processing, which becomes a material, on the upper surface side and the lower surface side. In this embodiment, the non-woven fabric 1 is formed by a portion folded on the upper surface side. A convex portion 4 that is curved to be convex upward is formed, and a groove portion 5 that is curved to be convex downward is formed by a portion folded on the lower surface side.
The convex portion 4 is continuously extended in the first direction X of the surface (sheet surface) of the nonwoven fabric 1, and in advance in the second direction Y orthogonal to the first direction X on the surface of the nonwoven fabric 1. A plurality of rows are provided at predetermined intervals. In this embodiment, each of the convex portions 4 extends continuously in the first direction X so as to be substantially parallel to the other convex portions 4.
On the other hand, the groove portion 5 is provided in a space between the convex portions 4 and 4 adjacent to the second direction Y so as to extend in the first direction X, and is recessed on the lower surface side from the top portion of the convex portion 4. It has a groove bottom 6.
凸部については、隣接する他の凸部との間の間隔は０．２５〜５ｍｍであることが好ましく、さらに好ましくは０．５〜３ｍｍ、より好ましくは、０．７５〜２ｍｍとすることである。なお、ここで、隣接する凸部の間の間隔とは、各凸部の第２方向の略中央位置（実質的に頂部）の間の距離を指す。
隣接する凸部の間の間隔の距離が０．２５ｍｍ未満であると不織布が凹凸構造を形成しているとは言い難く、凸部による肌との接触面積をあまり減らすことができないため、肌触りが低下する可能性がある一方、逆に５ｍｍ超であると加工前の加工対象の不織布と大差がなくなるため、凹凸を生かした柔軟な肌触りを得ることができない。
また、凸部は、溝部の溝底部において最も深い位置（不織布の第２面側）から、その凸部における最も高い位置（通常凸部の頂部）までの高さは０．２５〜５ｍｍであることが好ましく、さらに好ましくは０．５〜３ｍｍ、より好ましくは、０．７５〜２ｍｍとすることである。高さが０．２５ｍｍ未満であると、凸部の突出が小さすぎて凹凸構造を生かした柔軟な肌触りを得ることができず、逆に５ｍｍ超であると、凸部が突出しすぎて鋭利な構造となってしまうため、やはり柔軟な肌触りを得ることができない。
About a convex part, it is preferable that the space | interval between adjacent convex parts is 0.25-5 mm, More preferably, it is 0.5-3 mm, More preferably, it is set as 0.75-2 mm. is there. In addition, the space | interval between adjacent convex parts here refers to the distance between the approximate center positions (substantially top part) of the 2nd direction of each convex part.
If the distance between the adjacent convex portions is less than 0.25 mm, it is difficult to say that the nonwoven fabric forms an uneven structure, and the contact area with the skin due to the convex portions cannot be reduced so much. On the other hand, if it exceeds 5 mm, there is no great difference from the non-woven fabric to be processed before processing, so that it is not possible to obtain a soft touch utilizing unevenness.
Moreover, the height from the deepest position (the 2nd surface side of a nonwoven fabric) in the groove bottom part of a groove part to the highest position (the top part of a normal convex part) in the convex part is 0.25-5 mm. It is preferably 0.5 to 3 mm, more preferably 0.75 to 2 mm. If the height is less than 0.25 mm, the protrusion of the convex part is too small to obtain a soft touch utilizing the uneven structure, and conversely if it exceeds 5 mm, the convex part protrudes too much and is sharp. Since it becomes a structure, a soft touch cannot be obtained.
溝部５の溝底部６内には、この溝部５の溝底部６よりも下面３側に位置する底部９を備え且つ第１方向Ｘに対して不連続に設けられた複数の凹部７が設けられていて、これらの凹部７は、それぞれ、溝底部６と連続した状態で下面３側に向けて延びる立壁状の周面８と、この周面８の下端側に設けられた前述の底部９とを備えている。
この実施の形態においては、凹部７は、平面視略矩形状の開口及び周面８並びに底部９を有する上方開口の略直方体状の空間を備えた構成となっていて、各凹部７は、不織布１の下面３側に突出し、且つ他の凹部７から相互に独立した状態で形成されている。
また、周面８は、第１方向Ｘに沿うように延びる一対の第１周面８ａ，８ａと、第２方向Ｙに沿うように延びる一対の第２周面８ｂ，８ｂとを備えていて、一対の第１周面８ａ，８ａ同士は相互に向かい合う位置に配設されていると共に、一対の第２周面８ｂ，８ｂ同士についても相互に向かい合う位置に配設されている。
In the groove bottom portion 6 of the groove portion 5, a plurality of concave portions 7 provided with a bottom portion 9 located on the lower surface 3 side of the groove bottom portion 6 of the groove portion 5 and discontinuously provided in the first direction X are provided. Each of the recesses 7 includes a standing wall-shaped peripheral surface 8 extending toward the lower surface 3 side in a state of being continuous with the groove bottom portion 6, and the bottom portion 9 provided on the lower end side of the peripheral surface 8. It has.
In this embodiment, the recess 7 is configured to have a substantially rectangular parallelepiped space having an opening that has a substantially rectangular shape in plan view and a peripheral surface 8 and a bottom 9, and each recess 7 is a non-woven fabric. 1 projecting toward the lower surface 3 side, and is formed in a state independent from the other recesses 7.
The peripheral surface 8 includes a pair of first peripheral surfaces 8a and 8a extending along the first direction X and a pair of second peripheral surfaces 8b and 8b extending along the second direction Y. The pair of first peripheral surfaces 8a and 8a are disposed at positions facing each other, and the pair of second peripheral surfaces 8b and 8b are also disposed at positions facing each other.
そして、図２〜図４に示すように、凹部７の周面８のうちの第１周面８ａには、その第１周面８ａを貫通して不織布１の下面３側に通じる孔部１１が形成されている。
図２に示すように、この実施の形態においては、孔部１１は、一対の第１周面８ａ，８ａのそれぞれに１つずつ設けられていて、それらの孔部１１は、第１周面８ａにおける凹部７の底部９寄りの位置に形成されたものとなっている（したがって、１つの凹部７には２つの孔部１１が存在している。）。
一方で、一対の第２周面８ｂ，８ｂは、孔部１１に相当するものは存在せず、各第２周面８ｂは、下端側の全部が底部９と直接的に連結された状態となっている。
And as shown in FIGS. 2-4, in the 1st surrounding surface 8a of the surrounding surfaces 8 of the recessed part 7, the hole 11 which penetrates the 1st surrounding surface 8a and leads to the lower surface 3 side of the nonwoven fabric 1 is shown. Is formed.
As shown in FIG. 2, in this embodiment, one hole 11 is provided in each of the pair of first peripheral surfaces 8 a, 8 a, and the hole 11 is the first peripheral surface. It has become one formed in the bottom 9 side of the position of the recess 7 in the 8a (hence, two holes 11 are present in one recess 7.).
On the other hand, there is no pair of second peripheral surfaces 8b, 8b corresponding to the hole portion 11, and each second peripheral surface 8b is in a state where the entire lower end side is directly connected to the bottom portion 9. It has become.
ここで、凹部を設けたのは、溝部の溝底部が肌に触れた際の接触面積を極力減らすためである。即ち、この発明の不織布は、凸部、次いで溝部の溝底部の順に肌に触れ易いが、凸部が最も柔軟性が高いため、溝底部よりも凸部が肌に触れる機会が多いことが好ましく、且つ不織布としては肌に触れる接触面積が少ない方が柔軟性を感じ易い。そのため、凹部を設けることにより、溝部の溝底部において肌に接する部分をより少なくし、肌に当たる機会及び接触面積が可及的に少なくなるようにしている。
また、凹部を溝部の溝底部に設けたのは、凸部に比べて肌に触れにくい溝部の溝底に凹部を設けることにより、その凹部が肌に触れにくくして、凹部による違和感や異物感をできるだけ感じにくくするためである。
Here, the reason why the recess is provided is to reduce the contact area when the groove bottom of the groove touches the skin as much as possible. That is, the nonwoven fabric of the present invention is easy to touch the skin in the order of the convex portion and then the groove bottom portion of the groove portion, but since the convex portion has the highest flexibility, it is preferable that the convex portion touches the skin more frequently than the groove bottom portion. And as a nonwoven fabric, the one where there is little contact area which touches skin tends to feel a softness | flexibility. Therefore, by providing the concave portion, the portion that contacts the skin at the groove bottom portion of the groove portion is further reduced so that the chance of contact with the skin and the contact area are reduced as much as possible.
In addition, the concave portion is provided on the groove bottom of the groove portion by providing the concave portion on the groove bottom of the groove portion that is hard to touch the skin compared to the convex portion, thereby making the concave portion difficult to touch the skin, and the sense of incongruity or foreign matter due to the concave portion. This is to make it feel as difficult as possible.
凹部については、溝部の溝底部の第１面（この場合は上面）側の高さから、この凹部の底部の第１面側の高さまでの大きさが０．０５〜２ｍｍであることが好ましく、さらに好ましくは０．０７５〜１．５ｍｍ、より好ましくは０．１〜１ｍｍとすることである。
溝部の溝底部の第１面側の高さから凹部の底部の第１面側の高さまでの大きさが０．０５ｍｍ未満であると、後述の底部の剛性を確保しづらく、不織布の厚み方向の強度が不足し、逆に２ｍｍ超であると、吸収性物品の他の部材、例えば吸収体や不織布、フィルム等と貼り合わせる際、厚さ方向の強度が出ない一方で、圧縮した際に剛直感を感じてしまう可能性がある。
また、凹部と凸部との関係について、溝部の溝底部の第１面側の高さから凹部の底部の第１面側の高さまでの大きさは、溝部の溝底部の第１面側の高さから凸部の頂部の高さまでの大きさの１０〜８０％であることが好ましく、さらに好ましくは１５〜７０％、より好ましくは２０〜６０％とすることである。
溝部の溝底部の第１面側の高さから凹部の底部の第１面側の高さまでの大きさが、溝部の溝底部の第１面側の高さから凸部の頂部の高さまでの大きさの１０％未満であると、周面における孔部の形成スペースが十分に確保できず、孔部の形成が不十分となって凸部、延いては不織布としての柔軟性を得られない。逆に８０％を超えると、凹部が深くなりすぎて凹部の周面の強度が低下し毛羽立ち易くなるため、肌触りが低下する可能性がある。
Regarding the recess, the size from the height on the first surface (in this case, the upper surface) side of the groove bottom to the height on the first surface side of the bottom of the recess is preferably 0.05 to 2 mm. More preferably, it is 0.075 to 1.5 mm, and more preferably 0.1 to 1 mm.
If the size from the height on the first surface side of the groove bottom portion of the groove portion to the height on the first surface side of the bottom portion of the recess is less than 0.05 mm, it is difficult to ensure the rigidity of the bottom portion described later, and the thickness direction of the nonwoven fabric In contrast, when it is over 2 mm, when it is bonded to another member of the absorbent article, such as an absorbent body, a nonwoven fabric, or a film, the strength in the thickness direction does not come out, but when compressed There is a possibility of feeling instincts.
Moreover, about the relationship between a recessed part and a convex part, the magnitude | size from the height of the 1st surface side of the groove bottom part of a groove part to the height of the 1st surface side of the bottom part of a recessed part is the 1st surface side of the groove bottom part of a groove part. It is preferably 10 to 80% of the size from the height to the height of the top of the convex part, more preferably 15 to 70%, more preferably 20 to 60%.
The size from the height on the first surface side of the groove bottom portion of the groove portion to the height on the first surface side of the bottom portion of the concave portion is from the height on the first surface side of the groove bottom portion of the groove portion to the height of the top portion of the convex portion. If it is less than 10% of the size, a sufficient space for forming the hole on the peripheral surface cannot be secured, and the formation of the hole becomes insufficient, so that the convex portion and the flexibility as the nonwoven fabric cannot be obtained. . On the other hand, if it exceeds 80%, the concave portion becomes excessively deep, the strength of the peripheral surface of the concave portion is reduced and the fluff is likely to become fluffy, and the touch may be lowered.
また、凹部の第１方向の長さは、溝部の溝幅、即ち隣り合う凸部の間の距離にもよるが、０．２５〜５ｍｍであることが好ましく、さらに好ましくは０．５〜３ｍｍ、より好ましくは０．７５〜２ｍｍとすることである。
凹部の第１方向の長さが０．２５ｍｍ未満であると、凹部が小さくなりすぎて、凹部がほとんど機能しない可能性があり、逆に５ｍｍ超であると、凹部が第１方向に長くなりすぎて、平坦な不織布や凹部が存在しない不織布と柔軟性において大差がなく、柔軟な肌触りを得ることが出来ない。
一方、凹部の第２方向の長さは、０．２５〜５ｍｍであることが好ましく、さらに好ましくは０．５〜３ｍｍ、より好ましくは０．７５〜２ｍｍとすることである。
凹部の第２方向の長さ０．２５ｍｍ未満であると、やはり凹部が小さくなりすぎ、特に底部の形成が不十分になるため、凹部がほとんど機能しない可能性がある。逆に５ｍｍ超であると、凹部が大きくなりすぎて、凹部による違和感や異物感を感じ易くなる可能性がある。
The length of the concave portion in the first direction is preferably 0.25 to 5 mm, more preferably 0.5 to 3 mm, although it depends on the groove width of the groove, that is, the distance between adjacent convex portions. More preferably, the thickness is 0.75 to 2 mm.
If the length of the concave portion in the first direction is less than 0.25 mm, the concave portion becomes too small and the concave portion may hardly function. Conversely, if it exceeds 5 mm, the concave portion becomes longer in the first direction. Thus, there is no great difference in flexibility from a flat nonwoven fabric or a nonwoven fabric having no recess, and a soft touch cannot be obtained.
On the other hand, the length of the recess in the second direction is preferably 0.25 to 5 mm, more preferably 0.5 to 3 mm, and even more preferably 0.75 to 2 mm.
If the length of the concave portion in the second direction is less than 0.25 mm, the concave portion is too small, and particularly the bottom portion is insufficiently formed, so that the concave portion may hardly function. On the other hand, if it exceeds 5 mm, the concave portion becomes too large, and it may be easy to feel a sense of incongruity or a foreign object due to the concave portion.
さらに、孔部の大きさについて、孔部の最大部分の長さ（この実施の形態の場合、第１方向の長さ）は、凹部の大きさにもよるが、０．２５〜５ｍｍであることが好ましく、さらに好ましくは０．５〜３ｍｍ、より好ましくは０．７５〜２ｍｍとすることである。
孔部の最大部分の長さが０．２５ｍｍ未満であると孔部の形成が不十分であり、凹部の柔軟性が確保できない上、凸部の繊維の引張力が低下せずに凸部の十分な柔軟性が確保できない。逆に、５ｍｍ超であると孔部が大き過ぎて周縁部が毛羽立ち易くなり、かえって孔部の違和感や異物感が生じ、不織布の肌触りを低下させるおそれがある。
一方、孔部の高さ方向の最大長さは、凹部の深さにもよるが、０．１〜５ｍｍであることが好ましく、さらに好ましくは０．２５〜３ｍｍ、より好ましくは０．５〜２ｍｍとすることである。
孔部の高さ方向の最大長さが０．１ｍｍ未満であると、孔部の形成が不十分であり、この場合であっても、凹部の柔軟性が確保できない上、凸部の繊維の引張力が低下せずに凸部の十分な柔軟性が確保できない。逆に、５ｍｍ超であると、孔部の周縁部が大き過ぎて周縁部が毛羽立ち易くなり、孔部が違和感や異物感を生じさせ易くなるため、不織布の肌触りを低下させる可能性がある。
Furthermore, regarding the size of the hole, the length of the maximum portion of the hole (in this embodiment, the length in the first direction) is 0.25 to 5 mm, depending on the size of the recess. It is preferably 0.5 to 3 mm, more preferably 0.75 to 2 mm.
If the length of the maximum portion of the hole is less than 0.25 mm, the formation of the hole is insufficient, and the flexibility of the recess cannot be ensured. Sufficient flexibility cannot be secured. On the other hand, if it exceeds 5 mm, the hole is too large and the peripheral edge tends to become fluffy. On the other hand, the hole feels uncomfortable or foreign matter, which may reduce the touch of the nonwoven fabric.
On the other hand, the maximum length of the hole in the height direction depends on the depth of the recess, but is preferably 0.1 to 5 mm, more preferably 0.25 to 3 mm, and more preferably 0.5 to 2 mm.
When the maximum length in the height direction of the hole is less than 0.1 mm, the formation of the hole is insufficient. Even in this case, the flexibility of the recess cannot be ensured, and the fiber of the protrusion The tensile force does not decrease and sufficient flexibility of the convex portion cannot be ensured. Conversely, if it exceeds 5 mm, the peripheral edge of the hole is too large and the peripheral edge is likely to fluff, and the hole is liable to cause a sense of incongruity or foreign material, which may reduce the touch of the nonwoven fabric.
また、孔部を第１周面にのみ設けたのは、孔部が設けられている溝部と隣り合う凸部の繊維の引張力を開放して、凸部全体あるいは凸部を形成する繊維が移動する自由度を向上させ、凸部の柔軟性、より具体的には凸部における不織布の厚さ方向への柔軟性、及び不織布の平面方向（特に第２方向）に肌を滑らせた際の柔軟性を向上させて滑らかな感触を確保するためである。
これにより、凸部に、優れた硬軟感（不織布の厚さ方向への優れた柔らかさ）及び不織布の第２方向への優れた粗滑感（不織布の平面方向（特に第２方向）の優れた滑らかさ）の両方を付与して、不織布全体として優れた硬軟感及び粗滑感を確保することが可能となり、柔軟な肌触りを実現することができる。
Also, the hole is provided only on the first peripheral surface because the tensile force of the fiber of the convex part adjacent to the groove part provided with the hole part is released, and the fiber forming the whole convex part or the convex part When the degree of freedom of movement is improved, the flexibility of the convex part, more specifically, the flexibility of the convex part in the thickness direction of the nonwoven fabric, and the skin in the plane direction (particularly the second direction) of the nonwoven fabric This is to improve the flexibility and ensure a smooth feel.
Thereby, the convex part has excellent hardness and softness (excellent softness in the thickness direction of the nonwoven fabric) and excellent rough feeling in the second direction of the nonwoven fabric (excellent in the plane direction (particularly the second direction) of the nonwoven fabric). (Smoothness) can be imparted, and it is possible to ensure a superior softness and rough feeling as a whole nonwoven fabric, thereby realizing a soft touch.
逆に、孔部を第２周面に設けていないのは、不織布の第１方向、即ち凸部や溝部が延びている方向に肌を滑らせた場合に、凹部の存在による段差が肌に引っ掛かりにくくして、不織布の第１方向への滑らかさを確保するためである。
即ち、第２周面については、溝部の溝底部及び凹部の底部と連続し、継ぎ目なく一体となっているため、肌を不織布の第１方向に滑らせた場合には、肌は凹部の段差をあまり感じることなく凸部や溝部に沿って滑らかに移動し易い。これにより、凸部の柔軟性や繊維の柔軟性を生かした不織布の第１方向への滑らかさを確保することできる。
On the contrary, the hole is not provided on the second peripheral surface because when the skin is slid in the first direction of the nonwoven fabric, that is, in the direction in which the convex portion or the groove portion extends, a step due to the presence of the concave portion is formed on the skin. This is to make it difficult to catch and to ensure the smoothness of the nonwoven fabric in the first direction.
That is, the second peripheral surface is continuous with the groove bottom of the groove and the bottom of the recess and is seamlessly integrated. Therefore, when the skin is slid in the first direction of the nonwoven fabric, the skin has a step difference in the recess. It is easy to move smoothly along the convex part and the groove part without feeling much. Thereby, the smoothness in the 1st direction of the nonwoven fabric which utilized the softness | flexibility of a convex part and the softness | flexibility of a fiber is securable.
さらに、孔部を第１周面における凹部の底部寄りの位置に設けたのは、孔部を、肌が触れやすい凸部や溝部の溝底部からできるだけ遠ざけることにより、孔部が肌に触れる機会を極力減らし、違和感あるいは異物感を感じにくくするためである。
これにより、肌を不織布の平面方向に滑らせた際の滑らかさをより安定的に確保することができる。
In addition, the hole is provided at a position near the bottom of the recess on the first peripheral surface because the hole is kept as far as possible from the convex part that is easy to touch the skin and the groove bottom of the groove. This is to reduce as much as possible and make it difficult to feel uncomfortable or foreign matter.
Thereby, the smoothness at the time of sliding skin in the plane direction of a nonwoven fabric can be ensured more stably.
また、孔部１１は、この不織布１に含まれている熱可塑性樹脂繊維を溶融することなく、その熱可塑性樹脂繊維を破断することにより形成された周縁部１２を備えている。
より具体的には、図３及び図４に示すように、孔部１１の周縁部１２には、不織布１中の熱可塑性樹脂繊維のうち、破断により形成された破断端部１３ａを備えた破断繊維１３におけるその破断端部１３ａが含まれている。したがって、孔部１１の周縁部１２は、熱可塑性樹脂繊維が溶融によって硬化した部分は一切存在せず、柔軟な熱可塑性樹脂繊維の一部、あるいは、熱可塑性樹脂繊維のうち破断によって形成された破断端部１３ａを有する破断繊維１３によって形成されたものとなっている。これにより、仮に人間の肌が孔部１１の周縁部１２に触れたとしても、溶融により硬化した熱可塑性樹脂繊維が存在しないため、不織布の硬さや粗さを感じることが可及的に抑止される。
Moreover, the hole part 11 is provided with the peripheral part 12 formed by breaking the thermoplastic resin fiber, without melting the thermoplastic resin fiber contained in the nonwoven fabric 1.
More specifically, as shown in FIGS. 3 and 4, the peripheral edge portion 12 of the hole portion 11 is provided with a break end portion 13 a formed by breakage among the thermoplastic resin fibers in the nonwoven fabric 1. The broken end portion 13a of the fiber 13 is included. Therefore, the peripheral edge portion 12 of the hole portion 11 does not have any portion where the thermoplastic resin fiber is cured by melting, and is formed by a part of the flexible thermoplastic resin fiber or by breaking of the thermoplastic resin fiber. It is formed by the broken fiber 13 having the broken end portion 13a. As a result, even if the human skin touches the peripheral edge 12 of the hole 11, there is no thermoplastic resin fiber cured by melting, so that the hardness and roughness of the nonwoven fabric is suppressed as much as possible. The
ここで、破断繊維１３は、第１周面８ａを形成する熱可塑性樹脂繊維の一部の繊維であって、その熱可塑性樹脂繊維を、長さ方向に引っ張ったり物理的に切断して破断したりすることにより形成された破断端部１３ａを備えたものである。
したがって、破断端部１３ａは、熱可塑性樹脂繊維を溶融した場合のように、繊維の端部が溶けて丸くなって繊維径が大きくなることはなく、ちぎれたことによって先細りになったり、あるいは繊維径の変化がほとんど生じない態様となったりしている。これにより、人間の肌が孔部１１の周縁部１２に触れた場合であっても、ごわつきや繊維の引っ掛かりによる違和感を感じることが抑えられる。
Here, the breaking fiber 13 is a part of the thermoplastic resin fiber forming the first peripheral surface 8a, and the thermoplastic resin fiber is broken by pulling or physically cutting the thermoplastic resin fiber. It is provided with the fracture | rupture end part 13a formed by carrying out.
Therefore, the broken end portion 13a does not become round due to melting of the end portion of the fiber as in the case where the thermoplastic resin fiber is melted, and the fiber diameter does not increase. In some embodiments, the diameter hardly changes. Thereby, even if it is a case where human skin touches the peripheral part 12 of the hole part 11, it is suppressed that the sense of incongruity by a stickiness or a fiber catch is felt.
さらに、図３及び図４に示すように、孔部１１の内部空間１１ａには、熱可塑性樹脂繊維のうちの一部の繊維１４が架け渡されている。また、一部の破断繊維１３については、その破断端部１３ａが孔部１１の内部空間１１ａに延出した状態となっている。
したがって、孔部１１の内部空間１１ａ内には、その内部空間１１ａに架け渡された繊維１４と、一部の延出した繊維とが混在した状態となっていて、完全に開放された空間とはなっていない。
このように、孔部の内部空間に熱可塑性樹脂繊維の一部が架け渡された構成としたのは、仮に肌が孔部に触れた場合であっても、内部空間に架け渡された熱可塑性樹脂繊維が凹部の周面や底部と孔部との感触の違いをできるだけ小さくし、触れた者の違和感を感じにくくさせるためである。即ち、孔部の内部空間に架け渡された熱可塑性樹脂繊維が、肌が孔部を完全に突き抜けて不織布の第２面側（下面側）に至らないようにするため、周面や底部と孔部との境目の段差が触感上において小さくなり、これにより、肌触りが比較的滑らかになり、孔部に触れた者が違和感を感じにくくなる。
また、一部の破断繊維の破断端部が孔部の内部空間に延出する場合も、凹部の周面や底部と孔部との間の段差から生じる感触の違いを小さくするため、やはり肌触りを滑らかにする。
Furthermore, as shown in FIGS. 3 and 4, some of the thermoplastic resin fibers 14 are bridged in the internal space 11 a of the hole 11. Further, some of the broken fibers 13 are in a state in which the broken end portion 13 a extends into the internal space 11 a of the hole portion 11.
Therefore, in the internal space 11a of the hole 11, the fibers 14 spanned in the internal space 11a and a part of the extended fibers are mixed, and the completely open space It is not.
In this way, a part of the thermoplastic resin fiber is spanned in the internal space of the hole, even if the skin touches the hole, the heat spanned in the internal space This is because the plastic resin fiber minimizes the difference in feel between the peripheral surface of the recess or the bottom and the hole, and makes it difficult for the touched person to feel discomfort. That is, in order to prevent the thermoplastic resin fibers spanned in the internal space of the hole from completely passing through the hole and reaching the second surface side (lower surface side) of the nonwoven fabric, The level difference between the hole and the hole is reduced in tactile sensation, which makes the touch relatively smooth and makes it difficult for those who touch the hole to feel uncomfortable.
In addition, even when the broken ends of some broken fibers extend into the internal space of the hole, in order to reduce the difference in feel caused by the step between the peripheral surface of the recess and the bottom and the hole, it is still touch To smooth.
このとき、孔部の内部空間の開孔率は、１〜５０％とすることが好ましく、さらに好ましくは１．５〜３５％、より好ましくは２．５〜２０％とすることである。
孔部の内部空間の開孔率が１％未満であると、開孔率が低すぎて凸部や凸部の繊維に自由度を付与することができず、凸部の柔軟性を十分に確保できない。逆に５０％以上であると孔部が設けられた周面（この実施形態の場合は第１周面８ａ）の強度が低くなり易い上、孔部の周縁部の境目が触感上分かり易くなる可能性がある。
ただし、孔部の内部空間の開孔率については、不織布を使用する吸収性物品の種類や用途等によっては、前記範囲以外であってもよく、任意に設定することができる。
At this time, the open area ratio of the internal space of the hole is preferably 1 to 50%, more preferably 1.5 to 35%, and even more preferably 2.5 to 20%.
When the rate of hole area of the inner space of the hole is less than 1%, it is impossible to porosity confers flexibility to the fibers of too low protrusion or protrusions, sufficiently flexible convex portion It cannot be secured. On the other hand, if it is 50% or more, the strength of the peripheral surface provided with the hole (in this embodiment, the first peripheral surface 8a) tends to be low, and the boundary between the peripheral portions of the hole is easy to understand in terms of tactile sensation. there is a possibility.
However, the open area ratio of the internal space of the hole may be outside the above range depending on the type and application of the absorbent article using the nonwoven fabric, and can be arbitrarily set.
以下、前記構成を有する吸収性物品用不織布１の製造方法について説明する。
図５〜図８は、不織布１を製造する製造装置の一例を示すもので、この製造装置５０は、不織布１とするための加工を行う加工対象の不織布５１がロール状に巻かれ、その加工対象の不織布５１を搬送方向ＭＤに向けて巻き出す巻出装置５２と、巻出装置５２によって形成された加工対象の不織布５１に予熱を与える予熱装置６１と、予熱を与えた加工対象の不織布５１を延伸して凸部及び溝部（凹部含む）を形成するための賦形加工を行う賦形装置６２とを備えている。
Hereinafter, the manufacturing method of the nonwoven fabric 1 for absorbent articles which has the said structure is demonstrated.
FIGS. 5-8 shows an example of the manufacturing apparatus which manufactures the nonwoven fabric 1, and this manufacturing apparatus 50 winds the nonwoven fabric 51 of the process target which performs the process for setting it as the nonwoven fabric 1, and the process An unwinding device 52 for unwinding the target non-woven fabric 51 in the conveying direction MD, a preheating device 61 for preheating the non-woven fabric 51 to be processed formed by the unwinding device 52, and a non-woven fabric 51 for processing to which preheating has been applied. And a shaping device 62 that performs a shaping process for forming convex portions and groove portions (including concave portions).
巻出装置により巻き出される加工対象の不織布としては、熱可塑性樹脂繊維に加えて、その他の構成繊維を含有してもよい。その他の構成繊維としては、例えば、天然繊維（例えば、羊毛，コットン等）、再生繊維（例えば、レーヨン，アセテート等）、無機繊維（例えば、ガラス繊維，炭素繊維等）、合成樹脂繊維（例えば、ポリエチレン、ポリプロピレン、ポリブチレン、エチレン−酢酸ビニル共重合体、エチレン−アクリル酸エチル共重合体、エチレン−アクリル酸共重合体、アイオノマー樹脂等のポリオレフィン；ポリエチレンテレフタレート、ポリブチレンテレフタラート、ポリトリメチレンテレフタラート、ポリ乳酸等のポリエステル；ナイロン等のポリアミド等）等が挙げられる。不織布には、芯・鞘型繊維、サイド・バイ・サイド型繊維、島／海型繊維等の複合繊維；中空タイプの繊維；扁平、Ｙ型、Ｃ型等の異型繊維；潜在捲縮又は顕在捲縮の立体捲縮繊維；水流、熱、エンボス加工等の物理的負荷により分割する分割繊維等が混合されていてもよい。
不織布の製造方法としては、例えば、ウェブ（フリース）を形成し、繊維同士を物理的・化学的に結合させる方法が挙げられ、ウェブの形成方法としては、例えば、スパンボンド法、乾式法（カード法、スパンボンド法、メルトブローン法、エアレイド法等）、湿式法等が挙げられ、結合方法としては、例えば、サーマルボンド法、ケミカルボンド法、ニードルパンチ法、ステッチボンド法、スパンレース法等が挙げられる。このようにして製造された不織布の他、水流交絡法によりシート状に形成したスパンレースを使用してもよい。
In addition to the thermoplastic resin fiber, the non-woven fabric to be processed to be unwound by the unwinding device may contain other constituent fibers. Other constituent fibers include, for example, natural fibers (eg, wool, cotton, etc.), regenerated fibers (eg, rayon, acetate, etc.), inorganic fibers (eg, glass fibers, carbon fibers, etc.), synthetic resin fibers (eg, Polyolefins such as polyethylene, polypropylene, polybutylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ionomer resin; polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate And polyester such as polylactic acid; polyamide such as nylon). Nonwoven fabric, core-sheath type fibers, side-by-side type fibers, composite fibers such as islands / sea type fibers; hollow fiber type; flat, Y type, atypical fibers C type and the like; latent crimp Alternatively, three-dimensional crimped fibers of actual crimps; split fibers that are split by a physical load such as water flow, heat, embossing, or the like may be mixed.
Examples of the nonwoven fabric manufacturing method include a method of forming a web (fleece) and physically and chemically bonding fibers. Examples of the web forming method include a spunbond method and a dry method (card). Method, spunbond method, melt blown method, airlaid method, etc.), wet method, etc., and examples of the bonding method include thermal bond method, chemical bond method, needle punch method, stitch bond method, spunlace method, etc. It is done. In addition to the nonwoven fabric produced in this manner, a spunlace formed into a sheet shape by a hydroentanglement method may be used.
また、加工対象の不織布に用いる繊維は、吸収性物品に用いたときの***液の隠ぺい性の観点から、不透明性、特には白化性の高い繊維を用いることができ、例えば、不透明化させる光線透過抑制剤を用いてもよい。この光線透過抑制剤としては、無機フィラーを例示できる。この無機フィラーとして、例えば、酸化チタン、炭酸カルシウム、タルク、クレー、カオリン、シリカ、珪藻土、炭酸マグネシウム、炭酸バリウム、硫酸マグネシウム、硫酸バリウム、硫酸カルシウム、水酸化アルミニウム、水酸化マグネシウム、酸化亜鉛、酸化カルシウム、アルミナ、マイカ、ガラス粉、シラスバルーン、ゼオライト、及び珪酸白土等を例示することができる。これらは２種類以上を組み合わせて含有させても良い。特に、一般に繊維製造段階の工程性等の面から、二酸化チタンが好ましい。
また、熱可塑性樹脂繊維については、酸化防止剤、光安定剤、紫外線吸収剤、中和剤、造核剤、エポキシ安定剤、滑剤、抗菌剤、難燃剤、帯電防止剤、顔料、可塑剤等の添加剤を必要に応じて添加してもよい。熱可塑性樹脂繊維は、界面活性剤、親水剤等により親水化処理されていることが好ましい。
The fibers used for the nonwoven fabric to be processed can be made of fibers having high opacity, especially whitening properties, from the viewpoint of concealment of excretion fluid when used for absorbent articles. A permeation inhibitor may be used. An example of the light transmission inhibitor is an inorganic filler. As this inorganic filler, for example, titanium oxide, calcium carbonate, talc, clay, kaolin, silica, diatomaceous earth, magnesium carbonate, barium carbonate, magnesium sulfate, barium sulfate, calcium sulfate, aluminum hydroxide, magnesium hydroxide, zinc oxide, oxidation Examples include calcium, alumina, mica, glass powder, shirasu balloon, zeolite, and silicate clay. You may contain these in combination of 2 or more types. In particular, titanium dioxide is generally preferred from the standpoint of processability at the fiber production stage.
For thermoplastic resin fibers, antioxidants, light stabilizers, UV absorbers, neutralizers, nucleating agents, epoxy stabilizers, lubricants, antibacterial agents, flame retardants, antistatic agents, pigments, plasticizers, etc. These additives may be added as necessary. The thermoplastic resin fiber is preferably hydrophilized with a surfactant, a hydrophilic agent or the like.
さらに、加工対象の不織布の坪量は、通常は１０〜１００ｇ／ｍ2であり、好ましくは１５〜７５ｇ／ｍ2であり、更に好ましくは２０〜５０ｇ／ｍ2である。不織布の厚みは、通常は０．１〜５ｍｍであり、好ましくは０．５〜３ｍｍであり、更に好ましくは０．８〜２ｍｍである。 Further, the basis weight of the nonwoven fabric to be processed is usually 10 to 100 g / m 2 , preferably 15 to 75 g / m 2 , and more preferably 20 to 50 g / m 2 . The thickness of the nonwoven fabric is usually a 0.1 to 5 mm, preferably from 0.5 to 3 mm, more preferably from 0.8 to 2 mm.
予熱装置６１は、この実施の形態においては、上下一対の加熱ロール６１ａ，６１ｂを備えていて、搬送されてきた加工対象の不織布５１を、回転している下方の加熱ロール６１ｂに巻き付けて加熱した後、回転している上方の加熱ロール６１ａに受け渡し、その加熱ロール６１ａによって加工対象の不織布５１を再度加熱することが可能となっている。
また、賦形装置６２は、上下一対の延伸ロール６３，６４を備えていて、図６に示すように、上方の延伸ロール６３は、ロール幅方向に一定の間隔で配設された、この上方の延伸ロール６３の外周面に沿って相互に平行に複数列設けられた突稜６３ａと、隣り合う突稜６３ａ，６３ａの間に設けられた複数列の凹溝６３ｂとを備えている。
一方、下方の延伸ロール６４は、外周面に、上方の延伸ロール６３の凹溝６３ｂと噛み合うように設けられた複数のピン６４ａを備えている。図８に示すように、これらのピン６４ａは、ロール幅方向に対しては、上方の延伸ロール６３の突稜６３ａと接触しないように一定の間隔で配設されていると共に、ロールの周方向に対しては、外周面に沿って一定の間隔でほぼ直線的に配設されている。また、図７に示すように、この実施の形態における下方の延伸ロール６４は、複数のピン６４ａが、下方の延伸ロール６４の外周面に千鳥状に配設された構成となっている。
In this embodiment, the preheating device 61 includes a pair of upper and lower heating rolls 61a and 61b, and the conveyed nonwoven fabric 51 to be processed is wound around the rotating lower heating roll 61b and heated. After that, it is delivered to the rotating upper heating roll 61a, and the nonwoven fabric 51 to be processed can be heated again by the heating roll 61a.
Further, the shaping apparatus 62 is provided with a pair of upper and lower drawing rolls 63 and 64, as shown in FIG. 6, the upper drawing roller 63 is arranged at regular intervals in the roll width direction, the upper comprising of a protruding ridge 63a which is provided a plurality of rows parallel to one another along the outer circumferential surface of the stretching roll 63 and the grooves 63b of the plurality of rows disposed between the protruding ridge 6 3 a, 6 3 a adjacent ing.
On the other hand, the lower drawing roll 64 includes a plurality of pins 64 a provided on the outer peripheral surface so as to mesh with the concave grooves 63 b of the upper drawing roll 63. As shown in FIG. 8, these pins 64a are arranged at regular intervals so as not to come into contact with the ridges 63a of the upper extending roll 63 in the roll width direction, and the circumferential direction of the roll. Are arranged substantially linearly at regular intervals along the outer peripheral surface. Further, as shown in FIG. 7, draw roll 6 4 below in this embodiment, a plurality of pins 64a has a zigzag shape disposed configuration to the outer peripheral surface of the drawing rolls 64 of the lower.
前記構成を有する製造装置５０を用いて、吸収性物品用不織布１の製造方法を実施する場合には、巻出装置５２から巻き出された加工対象の不織布５１に対して予熱を加える予熱工程と、予熱工程を経た加工対象の不織布５１を延伸して賦形加工する賦形工程とを順次行う。 When performing the manufacturing method of the nonwoven fabric 1 for absorbent articles using the manufacturing apparatus 50 which has the said structure, the preheating process which pre-heats with respect to the nonwoven fabric 51 processed from the unwinding apparatus 52, and Then, a forming step of stretching and shaping the nonwoven fabric 51 to be processed after the preheating step is sequentially performed.
予熱工程は、巻出装置から巻き出され、搬送方向ＭＤに沿って搬送されてきた加工対象の不織布５１を、予熱装置６１の回転している上下一対の加熱ロール６１ａ，６１ｂの外周面に順次接触させることにより、加工対象の不織布５１を加熱して予熱を加える。
予熱温度は、加工対象の不織布を構成する熱可塑性樹脂繊維の種類にもよるが、例えばポリエチレンテレフタラート（ＰＥＴ）と高密度ポリエチレン（ＨＤＰＥ）との芯鞘型の複合繊維の場合、加熱ロールの外周面の温度を６０〜１２０℃程度とすることが好ましい。
In the preheating step, the nonwoven fabric 51 to be processed, which has been unwound from the unwinding device and transported along the transporting direction MD, is sequentially applied to the outer peripheral surfaces of the pair of upper and lower heating rolls 61a and 61b rotating the preheating device 61. By bringing them into contact, the nonwoven fabric 51 to be processed is heated and preheated.
The preheating temperature depends on the type of thermoplastic resin fiber constituting the nonwoven fabric to be processed. For example, in the case of a core-sheath type composite fiber of polyethylene terephthalate (PET) and high-density polyethylene (HDPE), the heating roll The temperature of the outer peripheral surface is preferably about 60 to 120 ° C.
賦形工程は、予熱工程を経て搬送されてきた加工対象の不織布５１を、賦形装置６２において、噛み合いながら回転している上下一対の延伸ロール６３，６４の間に装入し、その加工対象の不織布５１を、噛み合っている上方の延伸ロール６３の突稜６３ａ及び凹溝６３ｂと、下方の延伸ロール６４のピン６４ａとの間で延伸して賦形する。なお、賦形工程を実施するに際しては、賦形を行い易いように、延伸ロール６３，６４を６０〜１２０℃に加熱しながら賦形することが好ましい。
このとき、上方の延伸ロール６３は、突稜６３ａが加工対象の不織布５１と接触している部分を下方の延伸ロール６４の方向に押し込み、これにより凸部４が賦形される。
一方で、下方の延伸ロール６４は、周方向に一列に並んでいる複数のピン６４ａが、そのピン６４ａの先端部分に接触している加工対象の不織布５１を、上方の延伸ロール６３の同一の凹溝６３ｂ内に押し込む。このとき、加工対象の不織布５１のうち、ピン６４ａと非接触状態で凹溝６３ｂ内に引っ張られた部分は溝部５となる。また、ピン６４ａの先端部分と接触していた部分は、凹溝６３ｂ内に強く押し込まれて賦形されるため、これにより、凸部４及び溝部５が延設される方向に延びる第１周面８ａ、及びロール幅方向に延びる第２周面８ｂ、並びに底部９を有する凹部７が形成されることとなる。
なお、凹部７の底部９については、形成時において、上方の延伸ロール６３と下方の延伸ロール６４とが加工対象の不織布５１を噛み込んだ状態で、ピン６４ａの先端部分がその加工対象の不織布５１の当接部分を凹溝６３ｂ内に押し込むため、実質的に繊維密度が他の部分よりも高くなり、剛性が向上する。したがって、不織布１はこの凹部７の底部９の作用により、不織布１全体の剛性が向上することとなる。
In the shaping step, the non-woven fabric 51 to be processed, which has been conveyed through the preheating step, is inserted between the pair of upper and lower drawing rolls 63 and 64 that rotate while meshing in the shaping device 62, and the processing target The non-woven fabric 51 is stretched between the protruding ridges 63a and concave grooves 63b of the upper stretching roll 63 and the pins 64a of the lower stretching roll 64, and is shaped. In addition, when implementing a shaping process, it is preferable to shape | mold, extending the extending | stretching rolls 63 and 64 at 60-120 degreeC so that shaping may be performed easily.
At this time, the upper drawing roll 63 pushes the portion where the ridge 63a is in contact with the nonwoven fabric 51 to be processed in the direction of the lower drawing roll 64, whereby the convex portion 4 is shaped.
On the other hand, the lower drawing roll 64 has the same non-woven fabric 51 to be processed in which the plurality of pins 64 a arranged in a line in the circumferential direction are in contact with the tip portions of the pins 64 a as the same as the upper drawing roll 63. Push into the groove 63b. At this time, a portion of the nonwoven fabric 51 to be processed that is pulled into the concave groove 63 b in a non-contact state with the pin 64 a becomes the groove portion 5. In addition, since the portion that has been in contact with the tip portion of the pin 6 4 a is strongly pushed into the concave groove 63 b and shaped, the second portion extends in the direction in which the convex portion 4 and the groove portion 5 extend. so that the one round surface 8a, and second peripheral 8 b extending in the roll width direction, and the concave portion 7 having a bottom 9 is formed.
In addition, about the bottom part 9 of the recessed part 7, in the state at the time of formation, the upper extending roll 63 and the lower extending roll 64 have bitten the nonwoven fabric 51 to be processed, and the tip portion of the pin 6 4 a is the processing target. Since the contact portion of the non-woven fabric 51 is pushed into the groove 63b, the fiber density is substantially higher than the other portions, and the rigidity is improved. Therefore, the rigidity of the nonwoven fabric 1 as a whole is improved by the action of the bottom 9 of the recess 7.
そして、加工対象の不織布５１において、ピン６４ａの先端部分の幅方向（ロール幅方向）の両端部に接触していた部分は、突稜６３ａが加工対象の不織布５１を下方の延伸ロール６４の方向に押し込む際に発生する張力も手伝って、ピン６４ａが第１周面８ａを形成する熱可塑性樹脂繊維を掻き分けたり、あるいは、繊維を破断して、破断端部１３ａを有する破断繊維１３を形成したりする。
これにより、凹部７に、破断繊維１３の破断端部１３ａが含まれた孔部１１が形成されることとなる。なお、一部の熱可塑性樹脂繊維は、孔部１１の内部空間１１ａに架け渡された状態で残り、また、一部の破断繊維１３の破断端部１３ａは内部空間１１ａ内に延出した状態となる。
ここで、孔部１１が形成されるのは、加工対象の不織布５１の搬送方向ＭＤに沿う方向、即ち、延伸ロール６３，６４の回転方向であって、凸部４及び溝部５が延設される方向であることから、孔部１１も凸部４及び溝部５が延設される方向に沿う周面である第１周面８ａに形成される。
In the nonwoven fabric 51 to be processed, the portion of the tip 64a that is in contact with both ends in the width direction (roll width direction) of the pin 64a is the direction in which the ridge 63a passes the nonwoven fabric 51 to be processed below the drawing roll 64. The pin 64a scrapes the thermoplastic resin fiber forming the first peripheral surface 8a, or breaks the fiber to form the broken fiber 13 having the broken end portion 13a. Or
Thereby, the hole 11 including the broken end portion 13 a of the broken fiber 13 is formed in the concave portion 7. In addition, some thermoplastic resin fibers remain in a state of being spanned over the internal space 11a of the hole 11, and the broken end portion 13a of some broken fibers 13 extends into the internal space 11a. It becomes.
Here, the hole 11 is formed in the direction along the conveyance direction MD of the nonwoven fabric 51 to be processed, that is, the rotation direction of the stretching rolls 63 and 64, and the protrusion 4 and the groove 5 are extended. Therefore, the hole 11 is also formed on the first peripheral surface 8a which is a peripheral surface along the direction in which the convex portion 4 and the groove portion 5 are extended.
賦形工程が終了した不織布は、凸部４、及び凹部７を含む溝部５が形成されて吸収性物品用の不織布１として完成することとなる。この不織布１は、その後、使い捨ておむつや生理用ナプキン、失禁パッド、パンティーライナー等の吸収性物品のトップシートや防漏壁等、肌に触れる部分に使用されたり、あるいは使い捨ておむつのバックシートの外表面に貼り付けられたりすることとなる。 The non-woven fabric that has been subjected to the shaping step is completed as the non-woven fabric 1 for absorbent articles by forming the grooves 4 including the convex portions 4 and the concave portions 7. This non-woven fabric 1 is then used on a part that touches the skin, such as a top sheet of an absorbent article such as a disposable diaper, sanitary napkin, incontinence pad, panty liner, or a leakproof wall, or outside the back sheet of the disposable diaper. It will be affixed to the surface.
前記構成を有する吸収性物品用の不織布１は、凸部４，４間に設けられた溝部５の溝底部６に、その溝底部６よりも下面側に位置する底部９を有し、且つ不織布１の第１方向Ｘに対して不連続に設けられた複数の凹部７を備えていて、凹部７の第１周面８ａに、熱可塑性樹脂繊維を溶融することなく形成された周縁部１２を備えた孔部１１が設けられている。
そのため、凸部４や凸部４の繊維の移動の自由度が増す上、孔部１１によって凸部４の引張力が緩和されて凸部４全体が柔らかくなるため、肌で不織布１を厚さ方向に押した際には柔らかく感じ、また肌を不織布の平面方向に滑らせた際には滑らかさを感じることができることができる。
さらに、凹部７の孔部１１は、繊維を溶融することなく形成された周縁部１２を有し、この周縁部１２は、破断により形成された破断繊維１３の破断端部１３ａが含まれているため、従来のように溶融によって硬化した部分が存在しない。これにより、不織布１に優れた硬軟感（厚さ方向の柔軟性）及び優れた粗滑感（平面方向の滑らかさ）をさらに向上（柔らかく、滑らか）させることができ、肌に対してきわめて柔軟な感触を与えることが可能となる。
The nonwoven fabric 1 for absorbent articles having the above-described configuration has a bottom portion 9 positioned on the lower surface side of the groove bottom portion 6 at the groove bottom portion 6 of the groove portion 5 provided between the convex portions 4 and 4, and the nonwoven fabric. A plurality of recesses 7 provided discontinuously with respect to one first direction X , and a peripheral portion 12 formed on the first peripheral surface 8a of the recess 7 without melting thermoplastic resin fibers. A provided hole 11 is provided.
Therefore, the degree of freedom of movement of the convex portion 4 and the fibers of the convex portion 4 is increased, and the tensile force of the convex portion 4 is relaxed by the hole portion 11 so that the entire convex portion 4 becomes soft. It can feel soft when pressed in the direction, and can feel smooth when the skin is slid in the plane direction of the nonwoven fabric.
Furthermore, the hole 11 of the recess 7 has a peripheral edge 12 formed without melting the fiber, and the peripheral edge 12 includes a broken end 13a of the broken fiber 13 formed by breaking. Therefore, there is no portion cured by melting as in the prior art. As a result, the non-woven fabric 1 can be further improved (soft and smooth) with excellent softness (softness in the thickness direction) and excellent rough feeling (smoothness in the plane direction), and extremely soft against the skin. It is possible to give a unique feel.
前記実施の形態においては、凹部７の孔部１１が、第１方向Ｘに沿うように形成された一対の第１周面に設けられているが、孔部は第２方向に沿うように形成された一対の第２周面に設けられていてもよく、また、いずれか１つの周面に設けられている構成であってもよい。
さらに、前記実施の形態では、孔部１１が凹部７の周面における底部９寄りの位置に配設されているが、周面における孔部の位置については、必ずしも底部寄りである必要はなく、不織布の柔軟性を損なわない範囲で任意に設定することができる。
In the embodiment, the hole 11 of the recess 7 is provided on the pair of first peripheral surfaces formed along the first direction X, but the hole is formed along the second direction. It may be provided on the paired second peripheral surfaces, or may be configured on any one peripheral surface.
Furthermore, in the above-described embodiment, the hole 11 is disposed at a position near the bottom 9 on the peripheral surface of the recess 7, but the position of the hole on the peripheral surface does not necessarily need to be close to the bottom. It can set arbitrarily in the range which does not impair the softness | flexibility of a nonwoven fabric.
また、前記実施の形態においては、孔部１１の内部空間１１ａ内に、熱可塑性樹脂繊維中の一部の繊維１４が架け渡されているが、このように孔部の内部空間に架け渡された繊維が存在していなくてもよい。また、前記実施の形態のように、破断繊維の破断端部が孔部の内部空間内に延出していなくてもよい。 Moreover, in the said embodiment, although one part fiber 14 in a thermoplastic resin fiber is spanned in the internal space 11a of the hole 11, it is spanned in the internal space of a hole in this way. The fibers may not be present. Further, as in the embodiment described above, the broken end portion of the broken fiber may not extend into the internal space of the hole.
前記実施の形態においては、凹部７は略直方体状に形成されているが、凹部の形状については、円柱状や角柱状等、任意の形状とすることができる。 In the embodiment described above, the recess 7 is formed in a substantially rectangular parallelepiped shape, but the shape of the recess can be any shape such as a columnar shape or a prismatic shape.
さらに、前記実施の形態においては、凸部４が不織布１の第１方向Ｘに連続的に延びている。しかしながら、凸部については、必ずしも不織布の第１方向に連続的に延びていなくてもよく、間欠的であってもよい。ただし、このとき、凹部については、凸部が連続している部分は挟まれた溝部の溝底部に設けることが好ましく、これにより、凸部が先に肌に触れ易く、逆に凹部には接触しづらくなるため、凹部により異物感や違和感をより感じにくくなる。 Furthermore, in the said embodiment, the convex part 4 is extended in the 1st direction X of the nonwoven fabric 1 continuously. However, about a convex part, it does not necessarily extend continuously in the 1st direction of a nonwoven fabric, and may be intermittent. However, this time, for the recesses, it is preferable to provide the groove bottom of the groove portion sandwiched convex portions are continuous, thereby, easily protrusions touch the skin above, the recess conversely Since it becomes difficult to contact, a recessed part becomes hard to feel a foreign material feeling and a strange feeling.
本願発明に係る吸収性物品用の不織布の性能を確認するため、本発明に係る不織布（実施例）と、本発明の構成を有しない不織布（比較例）とで比較実験を行った。
比較実験は、実施例と比較例とについて、不織布の粗滑感を評価するために不織布の表面摩擦や粗さについての表面特性を調べる共に、不織布の硬軟感を評価するために不織布の厚さ方向の圧縮特性を調べ、比較した。
In order to confirm the performance of the nonwoven fabric for absorbent articles according to the present invention, a comparative experiment was performed with the nonwoven fabric according to the present invention (Example) and the nonwoven fabric without the configuration of the present invention (Comparative Example).
In comparison experiments, in order to evaluate the surface friction and roughness of the nonwoven fabric in order to evaluate the roughness of the nonwoven fabric, the thickness of the nonwoven fabric was evaluated in order to evaluate the softness of the nonwoven fabric. The direction compression properties were examined and compared.
表面特性の試験については、カトーテック（株）製の自動化表面試験機 ＫＥＳ‐ＦＢ４ ＡＵＴＯ‐Ａを用いて、各サンプルの１００ｍｍ×１００ｍｍの範囲を、０．５ｍｍ径のピアノ線で巻かれた１０ｍｍ×１０ｍｍの端子に２５ｇの荷重をかけ、１．０ｍｍ／ｓｅｃの速さで滑らせることによって表面特性を測定した。測定結果により、平均摩擦係数ＭＩＵ、その標準偏差ＭＭＤ、表面粗さの平均偏差ＳＭＤ［μｍ］を求めた。
また、圧縮特性は、カトーテック（株）製の自動化圧縮試験機 ＫＥＳ‐ＦＢ３ ＡＵＴＯ‐Ａを用いて、所定領域を面積２００ｍｍ２の円形平面状の端子を有する鋼板間で各サンプルを圧縮し、圧縮速度５０ｓｅｃ／ｍｍ、圧縮最大荷重を５０ｇｆ／ｃｍ２として各サンプルごとの圧縮特性を測定した。回復過程についても同一速度で圧縮特性を測定し、測定から得られた圧縮特性曲線の直線性ＬＣと、圧縮仕事量ＷＣ［ｇｆ・ｃｍ２］、圧縮回復率ＲＣ［％］とを求めた。
For the surface property test, an automated surface tester KES-FB4 AUTO-A manufactured by Kato Tech Co., Ltd. was used, and a range of 100 mm × 100 mm of each sample was wound with a piano wire having a diameter of 0.5 mm. A surface characteristic was measured by applying a load of 25 g to a × 10 mm terminal and sliding it at a speed of 1.0 mm / sec. From the measurement results, the average friction coefficient MIU, its standard deviation MMD, and the average deviation SMD [μm] of the surface roughness were determined.
In addition, the compression characteristics are obtained by compressing each sample between steel plates having circular planar terminals with an area of 200 mm 2 using an automated compression tester KES-FB3 AUTO-A manufactured by Kato Tech Co., Ltd. The compression characteristics for each sample were measured with a compression speed of 50 sec / mm and a maximum compression load of 50 gf / cm 2 . Also for the recovery process, the compression characteristics were measured at the same speed, and the linearity LC of the compression characteristic curve obtained from the measurement, the compression work WC [gf · cm 2 ], and the compression recovery rate RC [%] were determined.
実施例の不織布は、前記実施の形態において説明したものと基本的に同じ構成を有し、同じ製造方法で製造した。
また、実施例の不織布の製造に際しては、加工対象の不織布として、上層にＰＥＴ／ＰＥ芯鞘型複合繊維（繊度２．８ｄｔｅｘ（繊維長４４ｍｍ）、坪量２０ｇ／ｍ２）、下層にＰＥＴ／ＰＥ芯鞘型複合繊維（繊度２．２ｄｔｅｘ(繊維長４４ｍｍ)、坪量１０ｇ／ｍ２）をそれぞれ配置して一体化したスルーエアー不織布を用い、予熱工程及び賦形工程においては加熱温度１００℃とし、搬送速度２５０ｍ／ｍｉｎで加工を行った。
一方、比較例の不織布は、前記実施の形態において説明した製造装置とは、賦形装置の下方の延伸ロールの形状が異なっている製造装置を用いている。即ち、賦形装置の下方側の延伸ロールとして、前記賦形装置６２の下方側の延伸ロールである、ピン６４ａを備えた延伸ロール６４に代えて、上方の延伸ロール６３と同形、即ち突稜及び凹溝を備えた延伸ロールを用いている。つまり、上方の延伸ロールの突稜及び凹溝と、下方の延伸ロールの突稜及び凹溝とが相互に噛み合った状態の賦形装置を用い、これらの上下の延伸ロール間に加工対象の不織布を装入して賦形を行っている。
また、比較例の不織布の製造に際しては、加工対象の不織布として、上層にＰＥＴ／ＰＥ芯鞘型複合繊維（繊度２．８ｄｔｅｘ（繊維長４４ｍｍ）、坪量２０ｇ／ｍ２）、下層にＰＥＴ／ＰＥ芯鞘型複合繊維（繊度２．２ｄｔｅｘ(繊維長４４ｍｍ)、坪量１０ｇ／ｍ２）をそれぞれ配置して一体化したスルーエアー不織布を用い、予熱工程及び賦形工程においては加熱温度１００℃とし、搬送速度２５０ｍ／ｍｉｎで加工を行った。
比較実験の結果を次表に示す。
The nonwoven fabrics of the examples had basically the same configuration as that described in the above embodiment, and were manufactured by the same manufacturing method.
Moreover, in the manufacture of the nonwoven fabric of the example, as the nonwoven fabric to be processed, the upper layer is PET / PE core-sheath type composite fiber (fineness 2.8 dtex (fiber length 44 mm), basis weight 20 g / m 2 ), and the lower layer is PET / PE PE core-sheath type composite fibers (fineness 2.2 dtex ( fiber length 44 mm), basis weight 10 g / m 2 ) are used and integrated through air nonwoven fabrics, and heating temperature 100 ° C. in the preheating step and the shaping step And processing was performed at a conveyance speed of 250 m / min.
On the other hand, the nonwoven fabric of a comparative example uses the manufacturing apparatus from which the shape of the extending | stretching roll below the shaping apparatus differs from the manufacturing apparatus demonstrated in the said embodiment. That is, as the lower drawing roll of the shaping apparatus, instead of the drawing roll 64 having the pin 64a, which is the lower drawing roll of the shaping apparatus 62, the same shape as the upper drawing roll 63, that is, the ridge And the extending | stretching roll provided with the ditch | groove is used. In other words, a non-woven fabric to be processed is used between the upper and lower drawing rolls using a shaping device in which the protruding ridges and concave grooves of the upper drawing roll and the protruding ridges and concave grooves of the lower drawing roll mesh with each other. Is being shaped.
Further, in the manufacture of the nonwoven fabric of the comparative example, as the nonwoven fabric to be processed, the PET / PE core-sheath type composite fiber (fineness 2.8 dtex (fiber length 44 mm), basis weight 20 g / m 2 ) is used for the upper layer, and PET / PE is used for the lower layer. PE core-sheath type composite fibers (fineness 2.2 dtex ( fiber length 44 mm), basis weight 10 g / m 2 ) are used and integrated through air nonwoven fabrics, and heating temperature 100 ° C. in the preheating step and the shaping step And processing was performed at a conveyance speed of 250 m / min.
The results of the comparative experiment are shown in the following table.
表１からわかるように、表面特性については、第２方向（凸部及び溝部が延びる方向と直交する方向）のＭＩＵの値が実施例の方が比較例よりも明らかに小さいため、実施例の方が滑り易く滑らかさを感じると考えられる。
また、第２方向のＳＭＤの値が実施例の方が比較例よりも明らかに大きいため、不織布表面の凹凸が大きいと思われるが、これは凸部表面の繊維密度が高まっていないことを示しており、ＭＩＵの値を比較すると比較例の方が値が高いため、実施例の方が表面の滑らかさに優れるということを意味する。
圧縮特性については、ＬＣの値及びＲＣの値は実施例と比較例とではあまり差がないが、実施例の方がＷＣの値が低いことから、厚み方向にも柔らかさを感じ易いことがわかる。
以上のように、本発明の吸収性物品用の不織布によれば、優れた硬軟感（厚さ方向の柔軟性）及び優れた粗滑感（平面方向の滑らかさ）の両方を確保することができ、肌に対してきわめて柔軟な感触を与えることが可能であることが実証された。
As can be seen from Table 1, regarding the surface characteristics, the MIU value in the second direction (the direction orthogonal to the direction in which the protrusions and the grooves extend) is clearly smaller in the example than in the comparative example. It is thought that it is slippery and feels smooth.
Moreover, since the value of the SMD in the second direction is clearly larger in the example than in the comparative example, it seems that the unevenness on the surface of the nonwoven fabric is large, but this indicates that the fiber density on the surface of the convex part is not increased. When the MIU values are compared, the comparative example has a higher value, which means that the example has better surface smoothness.
Regarding the compression characteristics, the LC value and the RC value are not much different between the example and the comparative example, but since the WC value is lower in the example, it is easy to feel softness in the thickness direction. Recognize.
As described above, according to the nonwoven fabric for absorbent articles of the present invention, it is possible to ensure both excellent softness (softness in the thickness direction) and excellent rough feeling (smoothness in the planar direction). It has been demonstrated that it is possible to give a very soft feel to the skin.
１ 吸収性物品用不織布
２ 不織布の上面（第１面）
３ 不織布の下面（第２面）
４ 凸部
５ 溝部
６ 溝底部
７ 凹部
８ 周面
８ａ 第１周面
８ｂ 第２周面
９ 底部
１１ 孔部
１１ 孔部の内部空間
１２ 周縁部
１３ 破断繊維
１３ａ 破断端部
1 Nonwoven fabric for absorbent articles 2 Upper surface of nonwoven fabric (first surface)
3 Lower surface of the nonwoven fabric (second surface)
4 convex portion 5 groove portion 6 groove bottom portion 7 concave portion 8 peripheral surface 8a first peripheral surface 8b second peripheral surface 9 bottom portion 11 hole portion 11 internal space of hole portion 12 peripheral edge portion 13 broken fiber 13a broken end portion
Claims (6)
前記凸部は、前記不織布の面の第１方向に向けて延設されていると共に、前記不織布の面において前記第１方向と直交する第２方向に予め定めた間隔で複数列設けられ、
前記溝部は、前記第２方向に対して隣り合う前記凸部の間の空間に、前記第１方向に延設されていると共に、前記溝部の溝底部に、該溝部の溝底部よりも前記第２面側に位置する底部を有し、且つ前記第１方向に対して不連続に設けられた複数の凹部を備え、
前記凹部は、該凹部の周面の少なくとも一部が、前記第２面に通じる孔部を備える、吸収性物品用不織布。 A thermoplastic resin having a first surface and a second surface opposite to the first surface, and having a convex portion protruding toward the first surface and a groove portion recessed toward the second surface. A nonwoven fabric for absorbent articles containing fibers,
The protrusions are provided in a plurality of rows at a predetermined interval in a second direction orthogonal to the first direction on the surface of the nonwoven fabric while extending toward the first direction of the surface of the nonwoven fabric.
The groove portion extends in the first direction in a space between the convex portions adjacent to each other in the second direction, and the groove portion of the groove portion has the first portion more than the groove bottom portion of the groove portion. A plurality of recesses having a bottom portion located on the second surface side and provided discontinuously with respect to the first direction;
The recess, at least a portion of the peripheral surface of the recess is, El Bei a hole communicating with the second surface, the absorbent article for nonwovens.
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| JP2014266742A JP5829326B1 (en) | 2014-12-26 | 2014-12-26 | Nonwoven fabric for absorbent articles |
| PCT/JP2015/072927 WO2016103780A1 (en) | 2014-12-26 | 2015-08-13 | Non-woven fabric for absorbent article |
| CN201580002117.6A CN105828770B (en) | 2014-12-26 | 2015-08-13 | Absorbent commodity non-woven fabrics |
| TW104143386A TWI662951B (en) | 2014-12-26 | 2015-12-23 | Non-woven fabrics for absorbent articles |
| PCT/JP2015/086368 WO2016104768A1 (en) | 2014-12-26 | 2015-12-25 | Method for producing shaped non-woven fabric for absorbent article |
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| JP5989188B1 (en) * | 2015-05-29 | 2016-09-07 | ユニ・チャーム株式会社 | Method for producing shaped nonwovens for absorbent articles |
| JP6001207B1 (en) * | 2016-06-30 | 2016-10-05 | ユニ・チャーム株式会社 | Absorbent articles |
| JP6033981B1 (en) * | 2016-07-29 | 2016-11-30 | ユニ・チャーム株式会社 | Absorbent articles |
| JP2017119025A (en) * | 2015-12-28 | 2017-07-06 | ユニ・チャーム株式会社 | Nonwoven fabric for absorbent article and manufacturing method of nonwoven fabric |
| JP2018000525A (en) * | 2016-06-30 | 2018-01-11 | ユニ・チャーム株式会社 | Absorbent article |
| CN108472181A (en) * | 2015-12-28 | 2018-08-31 | 尤妮佳股份有限公司 | The non-woven fabrics and contain the non-woven fabrics as the absorbent commodity of outer load that the outer load of absorbent commodity is used |
| AU2016381717B2 (en) * | 2015-12-28 | 2021-04-29 | Unicharm Corporation | Non-woven fabric for liquid-permeable sheet of absorbent article, and absorbent article which includes said non-woven fabric as liquid-permeable sheet |
| US11000429B2 (en) | 2016-05-13 | 2021-05-11 | Unicharm Corporation | Nonwoven fabric for absorbent article |
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| EP3585338B1 (en) | 2017-02-27 | 2024-01-17 | The Procter & Gamble Company | Wearable article having characteristic material properties |
| CN111603316B (en) * | 2020-05-25 | 2022-03-25 | 福建恒安集团有限公司 | Absorption core and forming process thereof |
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| JP5989188B1 (en) * | 2015-05-29 | 2016-09-07 | ユニ・チャーム株式会社 | Method for producing shaped nonwovens for absorbent articles |
| CN108472181A (en) * | 2015-12-28 | 2018-08-31 | 尤妮佳股份有限公司 | The non-woven fabrics and contain the non-woven fabrics as the absorbent commodity of outer load that the outer load of absorbent commodity is used |
| AU2016381713B2 (en) * | 2015-12-28 | 2020-10-22 | Unicharm Corporation | Non-woven fabric for outer covering sheet of absorbent article, and absorbent article which includes said non-woven fabric as outer covering sheet |
| JP2017119025A (en) * | 2015-12-28 | 2017-07-06 | ユニ・チャーム株式会社 | Nonwoven fabric for absorbent article and manufacturing method of nonwoven fabric |
| WO2017115534A1 (en) * | 2015-12-28 | 2017-07-06 | ユニ・チャーム株式会社 | Nonwoven fabric for absorbent articles and method for manufacturing nonwoven fabric |
| EP3381427A4 (en) * | 2015-12-28 | 2018-10-24 | Unicharm Corporation | Non-woven fabric for outer covering sheet of absorbent article, and absorbent article which includes said non-woven fabric as outer covering sheet |
| US11529267B2 (en) | 2015-12-28 | 2022-12-20 | Unicharm Corporation | Non-woven fabric for liquid-permeable sheet of absorbent article, and absorbent article which includes said non-woven fabric as liquid-permeable sheet |
| US11026850B2 (en) | 2015-12-28 | 2021-06-08 | Unicharm Corporation | Nonwoven fabric for outer sheet of absorbent article, and absorbent article including the nonwoven fabric as outer sheet |
| AU2016381717B2 (en) * | 2015-12-28 | 2021-04-29 | Unicharm Corporation | Non-woven fabric for liquid-permeable sheet of absorbent article, and absorbent article which includes said non-woven fabric as liquid-permeable sheet |
| US11000429B2 (en) | 2016-05-13 | 2021-05-11 | Unicharm Corporation | Nonwoven fabric for absorbent article |
| EA032956B1 (en) * | 2016-06-30 | 2019-08-30 | Юничарм Корпорейшн | Absorbent article |
| JP6001207B1 (en) * | 2016-06-30 | 2016-10-05 | ユニ・チャーム株式会社 | Absorbent articles |
| AU2016413311B2 (en) * | 2016-06-30 | 2018-12-06 | Unicharm Corporation | Absorbent article |
| WO2018003126A1 (en) * | 2016-06-30 | 2018-01-04 | ユニ・チャーム株式会社 | Absorbent article |
| JP2018000525A (en) * | 2016-06-30 | 2018-01-11 | ユニ・チャーム株式会社 | Absorbent article |
| WO2018020693A1 (en) * | 2016-07-29 | 2018-02-01 | ユニ・チャーム株式会社 | Absorbent article |
| JP6033981B1 (en) * | 2016-07-29 | 2016-11-30 | ユニ・チャーム株式会社 | Absorbent articles |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201637630A (en) | 2016-11-01 |
| JP2016123651A (en) | 2016-07-11 |
| CN105828770A (en) | 2016-08-03 |
| WO2016103780A1 (en) | 2016-06-30 |
| CN105828770B (en) | 2017-06-23 |
| TWI662951B (en) | 2019-06-21 |
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