JP5674455B2 - Non-woven - Google Patents
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- JP5674455B2 JP5674455B2 JP2010288538A JP2010288538A JP5674455B2 JP 5674455 B2 JP5674455 B2 JP 5674455B2 JP 2010288538 A JP2010288538 A JP 2010288538A JP 2010288538 A JP2010288538 A JP 2010288538A JP 5674455 B2 JP5674455 B2 JP 5674455B2
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Description
本発明は不織布に関する。 The present invention relates to a nonwoven fabric.
生理用ナプキン、パンティーライナー、及び使い捨ておむつ等といった吸収性物品において、その機能に応じて、シート材の片面に突出した部分を設けたものや、筋状に隆起した部分を設けたもの、多数の小さな孔をあけたものなどが開発されている。例えば、特許文献１に開示されたものは、シートの片面側に突出した円錐台状の突出部が多数設けられている。これにより、表面シートに適したクッション性を有するシート材とすることができるとされる。特許文献２，３には凹凸ないし起伏のあるシート材において、多数の小孔が設けられたものが開示されている。これにより、表面シートとしての諸物性が良化するとされる。また、特許文献４にはシート材の片面が筋状に延びる突出部であり、その断面がかまぼこ（略半円）形状にされた積層シートが開示されている。これにより、例えばクッション性のある表面シートとして用いることができるとされる。 Absorbent articles such as sanitary napkins, panty liners, disposable diapers, etc., depending on the function, those provided with a protruding part on one side of the sheet material, those provided with a ridged part, many Products with small holes have been developed. For example, the one disclosed in Patent Document 1 is provided with a large number of frustoconical protrusions protruding on one side of the sheet. Thereby, it is supposed that it can be set as the sheet material which has cushioning properties suitable for a surface sheet. Patent Documents 2 and 3 disclose a sheet material having irregularities or undulations in which a large number of small holes are provided. Thereby, it is supposed that various physical properties as a surface sheet improve. Patent Document 4 discloses a laminated sheet in which one side of a sheet material is a protruding portion extending in a streak shape, and the cross-section thereof is a kamaboko (substantially semicircular) shape. Thereby, it is supposed that it can be used, for example as a cushioning surface sheet.
本発明者らは、上述のようなものとは異なる形態を有し、従来とは異なる性質やより良化した機能を付与しうる不織布の提供を目的に鋭意研究開発を行った。具体的には、シート材の片面側のみではなく、表裏両面に突出した部分を有し、しかも面内に孔がなく連続した不織布の作製を検討した。
上記の点に鑑み本発明は、通気性が良好であり、クッション性及び変形性に優れ、べた付かず肌に優しい、着用物品の表面シートや中間シート等として好適に利用することができる不織布の提供を目的とする。
The inventors of the present invention have conducted extensive research and development for the purpose of providing a non-woven fabric having a form different from that described above and capable of imparting a property different from the conventional one and a better function. Specifically, the production of a non-woven fabric which has portions protruding on both the front and back surfaces as well as on one side of the sheet material and has no holes in the surface was studied.
In view of the above points, the present invention provides a non-woven fabric that has good breathability, excellent cushioning and deformability, is non-sticky and gentle to the skin, and can be suitably used as a surface sheet or an intermediate sheet of a worn article. For the purpose of provision.
圧縮硬さが０．０１〜０．３５である不織布であって、第１面側に突出する第１突出部と第２面側に突出する第２突出部とが面内の第１方向と第２方向との２つの方向に向け壁部を介して複数交互に広がり、該不織布の複数の第１突出部及び複数の第２突出部に対する接触平面をそれぞれ想定したとき、そのいずれの側においても、該接触平面と前記不織布との間に面方向に広がる網目状の空間が形成される不織布。 It is a nonwoven fabric whose compression hardness is 0.01-0.35, Comprising: The 1st protrusion part which protrudes in the 1st surface side, and the 2nd protrusion part which protrudes in the 2nd surface side are the 1st directions in the surface. When the contact plane with respect to the plurality of first protrusions and the plurality of second protrusions of the nonwoven fabric is assumed in each of the two directions with the second direction and alternately extending through the wall portion, on either side thereof A nonwoven fabric in which a mesh-like space extending in the surface direction is formed between the contact plane and the nonwoven fabric.
本発明の不織布は、通気性が良好であり、クッション性及び変形性に優れ、べた付かず肌に優しく、着用物品の表面シートや中間シート等として好適に利用することができる。とりわけ、中間シートとして用いたときには、その高いクッション性及び特有の立体的な変形性により高い動作への追従性が得られる。 The nonwoven fabric of the present invention has good air permeability, excellent cushioning properties and deformability, is not sticky and is gentle to the skin, and can be suitably used as a surface sheet, an intermediate sheet or the like of a worn article. In particular, when used as an intermediate seat, high follow-up performance can be obtained due to its high cushioning properties and unique three-dimensional deformability.
図１は本発明の不織布の好ましい実施形態（実施形態１）である吸収性物品の表面シートの要部を模式的に示す一部断面斜視図である。図２は図１の不織布における領域ＩＩを拡大して示し、図３及び図４はそれぞれそのＩＩＩ−ＩＩＩ線断面及びＩＶ−ＩＶ線断面を示す拡大断面図である。この不織布１０は例えば生理用ナプキンや使い捨ておむつなどの吸収性物品の表面シートに適用することが好ましく、第１面側ｚ１（図２参照）を着用者の肌面側に向けて用い、第２面側ｚ２を物品内部の吸収体（図示せず）側に配置して用いることが好ましい。以下、上記図面に示した不織布１０の上記のとおり第１面側を着用者の肌面に向けて、表面シートと吸収体との間に介在させて用いる実施態様を考慮して説明するが、本発明がこれにより限定して解釈されるものではない。 FIG. 1 is a partial cross-sectional perspective view schematically showing a main part of a surface sheet of an absorbent article which is a preferred embodiment (Embodiment 1) of the nonwoven fabric of the present invention. 2 is an enlarged view of region II in the nonwoven fabric of FIG. 1, and FIGS. 3 and 4 are enlarged cross-sectional views showing a cross section taken along line III-III and a line IV-IV, respectively. The nonwoven fabric 10 is preferably applied to a surface sheet of an absorbent article such as a sanitary napkin or a disposable diaper, and the first surface side z 1 (see FIG. 2) is used toward the skin surface of the wearer. it is preferable to use by placing the second adhesive surface z 2 to the article inside of the absorber (not shown) side. Hereinafter, the first surface side of the nonwoven fabric 10 shown in the above drawings is directed to the wearer's skin surface, and will be described in consideration of an embodiment used by interposing between the topsheet and the absorber, The present invention is not construed as being limited thereby.
本実施形態の不織布１０は面方向に連続した構造を有している。この「連続」とは、断続した部分や小孔がないことを意味する。ただし、繊維間細孔のような微細孔は前記小孔には含まれない。これを区別していうときには、例えば小孔をその円相当直径で１．５ｍｍ以上のものと定義することができる。上記の「連続」の語には、積層シートであることも含まれるが、本実施形態においては積層していない単層のシートをその好ましい実施形態として示している。また、この「連続」という語の意味を、不織布の第１面側ｚ１の面と第２面側ｚ２の面とが実質的に連なっていると表現することもできる。ここでの実質的に連なるとは、上記のとおりに、本発明の効果を損なわない範囲で小孔を有さずそれより小さな微細孔を有していてもよい意味である。 The nonwoven fabric 10 of this embodiment has a continuous structure in the surface direction. This “continuous” means that there are no intermittent portions or small holes. However, micropores such as interfiber pores are not included in the small holes. When this is distinguished, for example, the small hole can be defined as having a circle equivalent diameter of 1.5 mm or more. The term “continuous” includes a laminated sheet. In the present embodiment, a single-layer sheet that is not laminated is shown as a preferred embodiment. Further, the meaning of the word “continuous” can also be expressed as the surface on the first surface side z 1 and the surface on the second surface side z 2 of the nonwoven fabric being substantially continuous. The term “substantially continuous” here means that, as described above, a small hole may be provided without a small hole as long as the effect of the present invention is not impaired.
本実施形態の不織布１０の第１面側には、多数の第１突出部１が縦横の２つの方向に面内で斜交する関係で延び配列されている（以下、この配列を斜交格子状配列ということがある。）。この格子状配列が直交（９０°）する関係でもよく、そのときには直交格子状の配列として区別していうことがある。本実施形態においては、その面内における第１方向（ｘ）と第２方向（ｙ）（図５参照）が、３０°〜９０°の角度で交差していることが好ましい。さらに本実施形態においては、不織布の第２面側に突出する多数の第２突出部２が形成されている。この第２突出部２も斜交格子状配列になっているが、直交格子状配列であってよい。その交差角度の好ましい範囲は、第１突出部１に伴って定まるため、上記と同様である。この第１突出部１と第２突出部２とは、シート面に対して互いに反対方向に突出している。そして、平面視においても側面視においても同一位置にない、つまり重なりのない関係で両者が交互に配置するようにされている。 On the first surface side of the nonwoven fabric 10 of the present embodiment, a large number of first protrusions 1 are arranged to extend in an oblique relationship in the plane in two vertical and horizontal directions (hereinafter, this arrangement is referred to as an oblique lattice). Sometimes referred to as an array of shapes). The lattice arrangement may be orthogonal (90 °), and in that case, the lattice arrangement may be distinguished as an orthogonal lattice arrangement. In the present embodiment, it is preferable that the first direction (x) and the second direction (y) (see FIG. 5) in the plane intersect at an angle of 30 ° to 90 °. Furthermore, in this embodiment, many 2nd protrusion parts 2 which protrude in the 2nd surface side of a nonwoven fabric are formed. The second protrusions 2 are also arranged in an oblique grid pattern, but may be an orthogonal grid pattern. Since the preferable range of the crossing angle is determined along with the first protrusion 1, it is the same as described above. The first projecting portion 1 and the second projecting portion 2 project in directions opposite to each other with respect to the sheet surface. In addition, they are arranged alternately in a relationship that is not in the same position in both a plan view and a side view, that is, there is no overlap.
上記のようにして面内の第１方向（ｘ方向）及び第２方向（ｙ方向）にそれぞれ延び配列された第１突出部１と第２突出部２とは、面状に矛盾無く連続し、不織布１０を構成している。ここで、矛盾無く連続するとは、特定の形状部分が連なって面状になるとき、屈折したり不連続になったりせず、緩やかな曲面で全体が連続した状態になることをいう。なお、上記第１突出部と第２突出部との配列形態は上記に限定されず、矛盾無く連続しうる配列で配置しうる形態であればよく、例えば、第１突出部を中心に６角形の頂点に６つの第２突出部が配置し、そのパターンが面内に広がる配列であってもよい。なお、この場合、第２突出部の数が第１突出部の数を上回るため、第２突出部同士が隣接する状態が生じるが、全体において連続したシート状態が構成される限りにおいて、このような形態の配列も第１突出部と第２突出部とが「交互」に配列したという意味に含まれる。 As described above, the first projecting portion 1 and the second projecting portion 2 that are arranged to extend in the first direction (x direction) and the second direction (y direction) in the plane are continuous in a planar manner without contradiction. The nonwoven fabric 10 is comprised. Here, “continuous without contradiction” means that when a specific shape portion is continuous and becomes planar, it is not refracted or discontinuous, and the whole is continuous with a gentle curved surface. In addition, the arrangement | sequence form of the said 1st protrusion part and the 2nd protrusion part is not limited to the above, What is necessary is just a form which can be arrange | positioned by the arrangement | sequence which can be continued without contradiction, for example, a hexagon about a 1st protrusion part. There may be an arrangement in which six second protrusions are arranged at the vertices and the pattern extends in the plane. In this case, since the number of the second protrusions exceeds the number of the first protrusions, the second protrusions are adjacent to each other. However, as long as a continuous sheet state is formed as a whole, this is the case. Such an arrangement is included in the meaning that the first protrusions and the second protrusions are arranged alternately.
本実施形態において第１突出部１及び第２突出部２は頂部に丸みをもった円錐台形状もしくは半球状にされている。より詳細にみれば、第１突出部の突出形状は尖鋭ではなくどちらかというと半球状であり、他方、第２突出部の突出形状はより尖鋭であり頂部に丸みのある円錐ないし円錐台形状になっている。なお、本実施形態において突出部は上記形状に限定されず、どのような突出形態でもよく、例えば、様々な錐体形状（本明細書において錐体形状とは、円錐、円錐台、角錐、角錐台、斜円錐等を広く含む意味である。）であることが実際的である。本実施形態において第１突出部及び第２突出部はその外径と相似する頂部に丸みのある円錐台形状もしくは半球状の内部空間１ｋ、２ｋを保持している。それぞれの内部空間１ｋ及び２ｋは、尾根６を介して隔てられており実質的に連続しない空間として形成されている。他方、第１突出部１と第２突出部２のシート厚み方向における間には、壁部３が構成されており、この壁部３ないし上記尾根部６を介して両突出部が連続するシート構造とされている。 In this embodiment, the 1st protrusion part 1 and the 2nd protrusion part 2 are made into the truncated cone shape or hemisphere which rounded the top part. In more detail, the protruding shape of the first protruding portion is not sharp but rather hemispherical, while the protruding shape of the second protruding portion is more sharp and rounded at the top or a truncated cone shape. It has become. In the present embodiment, the protruding portion is not limited to the above shape, and any protruding shape may be used. For example, various cone shapes (in this specification, the cone shape is a cone, a truncated cone, a pyramid, a pyramid It is a meaning that widely includes a table, an oblique cone, etc.). In the present embodiment, the first protrusion and the second protrusion hold a frustoconical or hemispherical internal space 1k, 2k having a rounded apex similar to the outer diameter thereof. The internal spaces 1k and 2k are separated from each other via the ridge 6 and are formed as substantially non-continuous spaces. On the other hand, a wall portion 3 is formed between the first protruding portion 1 and the second protruding portion 2 in the sheet thickness direction, and both protruding portions are continuous through the wall portion 3 or the ridge portion 6. It is structured.
ここで上述した本実施形態の不織布の基本構造に基づく作用について説明する。
・クッション性及び変形性（動作追従性）
本実施形態の不織布は表裏の片面だけではなく、両面において突出した部分を有するため、その構造に特有のクッション性を発現する。例えば筋状の突起や片面の突起ではどうしても線ないし面としての弾力性を発現することとなるが、本実施形態によれば三次元的な動きに対してもよく追従して両面において点（圧力変化によって円形状に面積を増減する）で支持された立体的なクッション性を奏する。また、詳細については後述するが、壁部３においてはその壁の起立する方向に向け配向した繊維の配向性を有する。そのため、ここにしっかりとしたコシが生まれ、繊維が厚み方向に潰れてしまうことのない適度のクッション性を実現する。さらに、上述した壁部の繊維配向性により、押圧力を受けて不織布が潰されたり折り曲げられたりしても、その形状復元力が大きく、梱包状態や着用が継続されても初期のクッション力を喪失しにくく好ましい。
・吸収性能
上記の良好なクッション性に起因する作用により液を一時保持する空間を確保できるため、吸収速度を速く維持できるとともに、吸収体にかかる圧力が適度に分散されるため、吸収体からの液戻り量が低減される。また形状復元力が大きいことから、吸収性能の安定性も確保される。
・肌触り
本実施形態の不織布には両面方向に第１及び第２の突出部があり、その頂部は丸みを帯びている。そのため、表面シートとして用いたときには、そのどちらの面を肌面側にしても、肌に対して点で柔らかく接触する良好な肌触りが実現される。また、装着時の圧力に対しても接触する点が円形状に増減することで肌触りを良好としながら、圧力に対する表面シート全体の形状変形を少なく抑えることができ、また、圧力変形からの形状復元も容易とすることができる。また本実施形態の不織布は軽荷重での変形性が高い（軽加重時の圧縮性が柔らかい）ため、これも良好な肌触りおよび柔らかさを実現させる。上記の良好なクッション性に起因する作用もあり、点接触による動的な作用と相俟って、独特の良好な肌触りが得られる。また、排泄等を受けたときにも、上述した点接触が効果を奏し、サラッとした肌触りが実現される。
・排泄物の捕集性
本実施形態の不織布１０においては、その両面に突出する第１突出部１及び第２突出部２がある。そしてそのそれぞれに、内部に形成された第１内部空間１ｋ及び第２内部空間２ｋがある。したがって、排泄液や排泄物の物性に応じて多様な形態でこれらを捕集し対応することができる。例えば、図１の不織布１０の第１面側ｚ１を肌面側としたと想定して説明すると、粘度が高く浸透性の低い排泄物であれば、表面シートを透過せずに、内部空間２ｋに一時その排泄物がストックされる。一方、粘度が低く透過しやすい排泄液であれば、表面シートを透過したのち、内部空間１ｋにこれが捕集される。このいずれの場合にも、肌面にまず当たる部分が第１突出部の頂部１１であり、上記捕集された排泄液ないし排泄物は肌に接触しにくくされている。これにより、尿や便、経血や下り物の排泄ののちにも、幅広く対応して極めて良好なサラッとした感じが持続される。
Here, the operation based on the basic structure of the nonwoven fabric of the present embodiment described above will be described.
・ Cushioning and deformability (motion following)
Since the nonwoven fabric of this embodiment has the part which protruded in not only one side of the front and back but both surfaces, the cushioning characteristic peculiar to the structure is expressed. For example, streak-like projections or single-sided projections inevitably exhibit elasticity as lines or surfaces. However, according to the present embodiment, dots (pressure It exhibits a three-dimensional cushioning property supported by a change in the area in a circular shape by a change. Moreover, although mentioned later for details, in the wall part 3, it has the orientation of the fiber orientated toward the direction where the wall stands. Therefore, a firm stiffness is born here, and an appropriate cushioning property is realized without the fibers being crushed in the thickness direction. Furthermore, even if the nonwoven fabric is crushed or bent due to a pressing force due to the fiber orientation of the wall described above, the shape restoring force is large, and the initial cushioning force is maintained even if packing state and wearing are continued. It is hard to lose and is preferable.
・ Absorption performance Since the space for temporarily holding the liquid can be secured by the action due to the above-mentioned good cushioning properties, the absorption speed can be maintained fast, and the pressure applied to the absorber is moderately dispersed. The amount of liquid return is reduced. Moreover, since the shape restoring force is large, the stability of the absorption performance is also ensured.
-Touch The nonwoven fabric of this embodiment has the 1st and 2nd protrusion part in a double-sided direction, The top part is roundish. Therefore, when it is used as a top sheet, a good touch that softly touches the skin with respect to the skin is realized regardless of which side is the skin side. In addition, the point of contact with the pressure at the time of mounting is increased or decreased in a circular shape, and the shape deformation of the entire surface sheet with respect to the pressure can be suppressed to a small amount while improving the touch, and the shape can be restored from the pressure deformation. Can also be easy. Moreover, since the nonwoven fabric of this embodiment has high deformability under light load (compressibility is soft under light load), this also realizes good touch and softness. There also exists an effect | action resulting from said favorable cushioning property, and a unique favorable touch is obtained with the dynamic effect | action by a point contact. Moreover, the point contact mentioned above has an effect also when excretion etc. are received, and the smooth touch is implement | achieved.
-Collectability of excrement In the nonwoven fabric 10 of this embodiment, there exist the 1st protrusion part 1 and the 2nd protrusion part 2 which protrude on the both surfaces. Each of them has a first internal space 1k and a second internal space 2k formed therein. Therefore, these can be collected and dealt with in various forms according to the physical properties of the excretion fluid and excrement. For example, when explained on the assumption that the first surface z 1 of the nonwoven fabric 10 of Figure 1 was the skin side, if a low excrement viscosity high permeability, without passing through the topsheet, the interior space The excrement is temporarily stocked at 2k. On the other hand, if the excretory liquid has a low viscosity and easily permeates, it passes through the top sheet and is collected in the internal space 1k. In any of these cases, the portion that first hits the skin surface is the top 11 of the first protruding portion, and the collected excretory fluid or excrement is made difficult to contact the skin. As a result, after the excretion of urine, feces, menstrual blood and spillage, a very good and smooth feeling is sustained in a wide range.
ここで本実施形態の不織布における特徴部分である、不織布１０の複数の第１突出部１及び複数の第２突出部２に対する接触平面７１，７２（図１参照）をそれぞれ想定したとき、そのいずれの側においても形成される、該接触平面と前記不織布との間に面方向に広がる網目状の空間について説明する。図５は、第１突出部１と第２突出部とが面内の第１方向（ｘ）及び第２方向（ｙ）に延びて配置された形態をモデル化して示している（ｘ方向及びｙ方向は一点鎖線で図示した方向及びこれを平行移動した方向を含む。）。円で示された第１突出１及び第２突出部２（破線）はそれぞれ、その平面視の概略的な位置を示しており、その中心が頂部の頂点にほぼ一致する。同図に示したように、本実施形態の不織布１０においては、上記網状空間Ｖ１，Ｖ２がそれぞれ、不織布の第１面側及び第２面側に形成されている。つまり、第１面側においては、第１突出部１の実線の円の外方の領域が網状空間（第１面側網状空間）Ｖ１とされている。他方、第２面側においては、第２突出部２の破線の円の外方の領域が網状空間（第２面側網状空間）Ｖ２とされている。図６はモデル化した図であるが、接触平面を変形しない硬質の部材面と仮定し、実線の円及び破線の円を、その硬質部材面を押し付けて形成された第１突出部及び第２突出部がつぶれた接触面とみてもよい。 Here, when the contact planes 71 and 72 (see FIG. 1) with respect to the plurality of first protrusions 1 and the plurality of second protrusions 2 of the nonwoven fabric 10, which are characteristic portions in the nonwoven fabric of the present embodiment, are respectively assumed, either A mesh-like space extending in the plane direction between the contact plane and the nonwoven fabric, which is also formed on the side of the sheet, will be described. FIG. 5 shows a model in which the first protrusion 1 and the second protrusion extend in the first direction (x) and the second direction (y) in the plane (x direction and The y direction includes the direction illustrated by the alternate long and short dash line and the direction in which this is translated). Each of the first protrusion 1 and the second protrusion 2 (broken line) indicated by a circle indicates a schematic position in plan view, and its center substantially coincides with the apex of the top. As shown in the figure, in the nonwoven fabric 10 of the present embodiment, the mesh spaces V 1 and V 2 are formed on the first surface side and the second surface side of the nonwoven fabric, respectively. That is, on the first surface side, a region outside the solid circle of the first protrusion 1 is a mesh space (first surface-side mesh space) V 1 . On the other hand, in the second surface side, outside the area of the dashed circle of the second projecting portion 2 is a reticulated space (second surface mesh space) V 2. FIG. 6 is a modeled view, but it is assumed that the contact plane is a hard member surface that does not deform, and the solid line circle and the broken line circle are pressed against the hard member surface to form a first protrusion and a second protrusion. It may be considered as a contact surface in which the protruding portion is crushed.
さらに上述した本実施形態の不織布の特徴的な構造に基づく作用について説明する。
・通気性
本実施形態の不織布では第１面側および第２面側両方に網状空間が存在するため、着用者から発生する湿気を拡散しつつ、吸収体側から発散する蒸気も効果的に拡散させることができる。
・吸収性能（液拡散性、通液性）
本実施形態の不織布では第１面側および第２面側両方に網状空間が存在するため、液を吸収する際には素早く上記網状空間で拡散し、肌への液接触を少なくする。また本不織布の繊維構造においても適度な空間が存在しているため、液拡散を行いながら、吸収体側への液通過も適切に行うことができる。さらに過吸収状態の場合などに吸収体から液が溢れてきた際には、まだ吸収に余裕のある他の吸収部位に、前記網状空間により適切に液が拡散する。
Furthermore, the effect | action based on the characteristic structure of the nonwoven fabric of this embodiment mentioned above is demonstrated.
-Breathability In the nonwoven fabric of this embodiment, since the mesh space exists on both the first surface side and the second surface side, the vapor generated from the absorber side is effectively diffused while diffusing moisture generated from the wearer. be able to.
-Absorption performance (liquid diffusibility, liquid permeability)
In the nonwoven fabric of this embodiment, since the mesh space exists on both the first surface side and the second surface side, when the liquid is absorbed, it quickly diffuses in the mesh space to reduce the liquid contact with the skin. Moreover, since the moderate space exists also in the fiber structure of this nonwoven fabric, liquid passage to an absorber side can be performed appropriately, performing liquid diffusion. Furthermore, when the liquid overflows from the absorbent body in the case of an overabsorbing state, the liquid is appropriately diffused by the mesh space to other absorption sites that still have a margin for absorption.
適切な柔らかさと吸収性を維持させるために必要な圧縮硬さ（ＬＣ）は、０．０１〜０．３５が好ましく、更には０．０５〜０．３が、より好ましくは０．１〜０．２５の範囲である。本実施形態の不織布は、圧縮硬さ（ＬＣ）が上記の範囲であるため、適度な空隙を有することができ、柔軟性を保持しながら、高い吸収性能を達成することができる。 The compression hardness (LC) necessary for maintaining appropriate softness and absorbency is preferably 0.01 to 0.35, more preferably 0.05 to 0.3, and still more preferably 0.1 to 0. .25 range. Since the nonwoven fabric of this embodiment has a compression hardness (LC) in the above range, it can have appropriate voids and can achieve high absorption performance while maintaining flexibility.
図６は、接触平面を上述したような硬質の部材（例えば金属製の台座と押圧板）とみて、あるいは実際にそれを用いて、所定の圧力で押圧したときの不織布の変形状態を模式的に示した説明図である。視野としては、図２に示した断面と同様であるが、簡略化して示している。本実施形態の不織布１０は、非変形性の押圧面により５０ｇｆ／ｃｍ２の圧力で前記不織布を面方向に押圧したときにも、該押圧面と前記不織布との間の網目状空間Ｖ１，Ｖ２が維持されていることが好ましい。このような網目状空間の維持性は第１面側もしくは第２面側のみであってもよい。これは、つまり相応の押圧を受けても適度に反発し不織布が良好なクッション性を発揮することを示している。この、５０ｇｆ／ｃｍ２の圧力とは、たとえば実際の吸収性物品に適用されたときに、乳幼児が着座したときの圧力に相当する圧力である。なお、本発明において圧力の測定は特に断らない限り、後記実施例に記載の手順で行った。 FIG. 6 schematically shows the deformation state of the nonwoven fabric when the contact plane is viewed as a hard member as described above (for example, a metal pedestal and a pressing plate) or is actually used and pressed with a predetermined pressure. It is explanatory drawing shown in. The field of view is similar to the cross section shown in FIG. 2, but is simplified. The nonwoven fabric 10 of the present embodiment has a mesh-like space V 1 between the pressing surface and the nonwoven fabric even when the nonwoven fabric is pressed in the surface direction with a non-deformable pressing surface at a pressure of 50 gf / cm 2 . V 2 is preferably maintained. Such maintainability of the mesh space may be only on the first surface side or the second surface side. This means that even when subjected to a corresponding pressure, the nonwoven fabric rebounds moderately and the nonwoven fabric exhibits good cushioning properties. The pressure of 50 gf / cm 2 is a pressure corresponding to the pressure when the infant is seated when applied to an actual absorbent article, for example. In the present invention, the measurement of pressure was performed according to the procedure described in the examples described below unless otherwise specified.
本実施形態の不織布１０はさらに、非変形性の押圧面により０．５ｇｆ／ｃｍ２の圧力で前記不織布を面方向に押圧したときに、該押圧面及び前記不織布の接触面積Ｓ０．５と前記押圧面の単位総面積Ｓａ（面方向に１ｍｍ２以上の空間がある場合、その空間は除く）との比率（Ｓ０．５／Ｓａ）が０．１〜０．４、更には０．１２〜０．３５、特に０．１５〜０．３であることが好ましい。このような範囲で接触面積Ｓ０．５が押圧に対して単位総面積より小さくされているということは、図６（ｂ）のように押圧下においても網状空間Ｖ１，Ｖ２が維持されていることを意味し、不織布を触ったときの柔らかさ、もしくは滑らかさ、といった優れた触感を有することを意味する。なお、０．５ｇｆ／ｃｍ２の圧力とは、たとえば実際の吸収性物品に適用されたときに、着座していないときの、不織布と肌との接触状態に相当する圧力である。 The nonwoven fabric 10 of the present embodiment further has a contact area S 0.5 between the pressing surface and the nonwoven fabric when the nonwoven fabric is pressed in the surface direction with a non-deformable pressing surface at a pressure of 0.5 gf / cm 2. The ratio (S 0.5 / Sa) to the unit total area Sa of the pressing surface (excluding the space when there is a space of 1 mm 2 or more in the surface direction) is 0.1 to 0.4, further It is preferably 12 to 0.35, particularly preferably 0.15 to 0.3. In such a range, the contact area S 0.5 is smaller than the total unit area with respect to the press, which means that the mesh spaces V 1 and V 2 are maintained even under the press as shown in FIG. 6B. It means that it has excellent touch feeling such as softness or smoothness when touching the nonwoven fabric. In addition, the pressure of 0.5 gf / cm < 2 > is a pressure equivalent to the contact state of a nonwoven fabric and skin when not sitting, for example, when applied to an actual absorbent article.
なお、上記のような接触面積比率となるのは、第１面側及び第２面側の両者であることが好ましいが、片方のみであってもよい。上記単位総面積Ｓａと接触面積Ｓ０．５との関係について少し補足すると、図５に示したように単位総面積Ｓａは不織布内の平面視における任意の領域であればよく、好ましくは、第１突出部及び第２突出部が複数均等に包含される領域である。これに対して、図中の実線による円を第１突出部の押圧面との接触部分としてみると、上記単位総面積Ｓａにおける第１突出部の接触面積Ｓ０．５は、ハッチングをした各領域の面積の総和となる。この比率が上記接触面積比率（Ｓ０．５／Ｓａ）となる。 Note that the contact area ratio as described above is preferably on both the first surface side and the second surface side, but may be only on one side. With little supplementary relationship between the contact area S 0.5 with the unit total area Sa, a unit total area Sa as shown in FIG. 5 may be any region in a plan view in the nonwoven fabric, preferably, the This is an area in which a plurality of the first protrusions and the second protrusions are evenly included. On the other hand, when the circle by the solid line in the figure is seen as a contact portion with the pressing surface of the first protrusion, the contact area S 0.5 of the first protrusion in the unit total area Sa is hatched. This is the total area area. This ratio is the contact area ratio (S 0.5 / Sa).
また、本実施形態においては、非変形性の押圧面により５０ｇｆ／ｃｍ２の圧力で前記不織布を面方向に押圧したときに、該押圧面及び前記不織布の接触面積Ｓ５０と前記押圧面の単位総面積Ｓａとの比率（Ｓ５０／Ｓａ）が０．３〜０．９、更には０．４〜０．８５、特に０．５〜０．８であることが好ましい。
このような範囲で接触面積Ｓ５０が押圧に対して単位総面積より小さくされているということは（図７（ｃ）参照）、着座時などの加圧時においても不織布構造として空間が存在し、吸収性や通気性が維持されるということを意味する。なお、上記のような接触面積比率となるは、第１面側及び第２面側の両者であることが好ましいが、片方のみであってもよい。接触面積比率（Ｓ５０／Ｓａ）の見方については、表裏を異にする以外、上記接触面積比率（Ｓ０．５／Ｓａ）と同様である。
In the present embodiment, when pressing the nonwoven fabric in the plane direction at a pressure of 50 gf / cm 2 by the pressing surface of the non-deformable, pressing pressure and the unit of the pressing surface and the contact area S 50 of the nonwoven fabric The ratio (S 50 / Sa) to the total area Sa is preferably 0.3 to 0.9, more preferably 0.4 to 0.85, and particularly preferably 0.5 to 0.8.
In this range, the contact area S 50 is smaller than the unit total area with respect to the pressing (see FIG. 7C), and there is a space as a nonwoven fabric structure even during pressurization such as sitting. This means that absorbency and breathability are maintained. Note that the contact area ratio as described above is preferably on both the first surface side and the second surface side, but may be only on one side. The contact area ratio (S 50 / Sa) is viewed in the same manner as the contact area ratio (S 0.5 / Sa) except that the front and back sides are different.
さらに本実施形態の不織布１０においては、非変形性の押圧面により５０ｇｆ／ｃｍ２の圧力で前記不織布を面方向に押圧したときのシート厚みＴ５０と、同様に０．５ｇｆ／ｃｍ２の圧力で押圧したときのシート厚みＴ０．５との比率（Ｔ５０／Ｔ０．５）が、０．１〜０．４、更には０．１５〜０．３５であることが好ましい。このようなシート厚み方向のコシを有する不織布とすることで、優れたクッション性を有するとともに、素早く液を落とし込む、また液戻りの低減化、といった吸収性能にも寄与する。 Furthermore, in the nonwoven fabric 10 of this embodiment, the sheet thickness T 50 when the nonwoven fabric is pressed in the surface direction with a pressure of 50 gf / cm 2 by a non-deformable pressing surface, and similarly a pressure of 0.5 gf / cm 2 . It is preferable that the ratio (T 50 / T 0.5 ) with the sheet thickness T 0.5 when pressed at 0.1 to 0.4 is 0.15 to 0.35. By using such a nonwoven fabric having a stiffness in the sheet thickness direction, it has excellent cushioning properties, and contributes to absorption performance such as dropping liquid quickly and reducing liquid return.
さらに本実施形態における繊維配向性を含め本実施形態の不織布のより詳細な特徴について、その形状をモデルとして簡略化して示した図７〜９に基づいて説明する。本実施形態の不織布には第１突出部１と第２突出部２（破線で示した）とがあり、図５ではそれらがそれぞれ単純な円として示されている。それらの円の大きさは、区別のため若干異なるものとしており、図１等に示した形態とその寸法等において一致するものではない。本実施形態の不織布においては、第１突出部１と第２突出部２とが格子状配列になって配置されている。これを、別の言い方で示すと、所定方向に第１列ｋ１、第２列ｋ２、第３列ｋ３、としてみたとき、各列の第１突出部１と第２突出部２とは交互に配置されており、各列の突出部をシート面内で各列に斜交する方向（ｙ方向）に投影したときに、隣接する列において第１突出部と第２突出部とが重なる関係となる。さらに言うと、第ｎ列と第ｎ＋２列において、第１突出部１と第２突出部２とがそれぞれ重なる状態とされている。つまり、本実施形態においては、列ｋ１の第１突出部及び第２突出部がｙ方向に平行移動したとき、列ｋ３の第１突出部及び第２突出部と重なる関係とされている。ただし、本発明がこれに限定して解釈されるものではなく、上記隣接する第１突出部と第２突出部とにずれがあってもよい。 Furthermore, the more detailed characteristic of the nonwoven fabric of this embodiment including the fiber orientation in this embodiment is demonstrated based on FIGS. 7-9 which simplified and showed the shape as a model. The nonwoven fabric of this embodiment has the 1st protrusion part 1 and the 2nd protrusion part 2 (it showed with the broken line), and these are each shown as a simple circle in FIG. The sizes of these circles are slightly different for distinction, and do not coincide with the form shown in FIG. In the nonwoven fabric of this embodiment, the 1st protrusion part 1 and the 2nd protrusion part 2 are arrange | positioned by the grid | lattice-like arrangement | sequence. In other words, when the first row k 1 , the second row k 2 , and the third row k 3 are viewed in a predetermined direction, the first protrusion 1 and the second protrusion 2 in each row Are alternately arranged, and when the protrusions of each row are projected in a direction (y direction) oblique to each row within the sheet surface, the first protrusions and the second protrusions are adjacent in the adjacent rows. Overlapping relationship. More specifically, the first protrusion 1 and the second protrusion 2 overlap each other in the n-th row and the (n + 2) -th row. That is, in the present embodiment, when the first protrusion and the second protrusion of the column k 1 is moved parallel to the y-direction, there is a superimposed relation to the first protrusions and second protrusions of the row k 3 . However, the present invention is not construed as being limited to this, and there may be a shift between the adjacent first protrusion and second protrusion.
第１突出部１と第２突出部２との間には、壁部３が形成されている。図７に示した中央の第１突出部１でみると、四方の第２突出部２から連続してくる４つの壁部部分３１、３２、３３、３４が形成されている。そして、その４つの壁部部分３１〜３４はシート面内方向で壁部部分３１’、３２’、３３’、３４’で連繋されており、一連になり環状の壁部３が構成されている。前記壁部部分３１’、３２’、３３’、３４’の第１面側で隣接する第１突出部との間には馬の背になった稜線部分が存在し、その部分が尾根部６となり上記壁部部分３１’〜３４’のそれぞれに対応して、尾根部６１〜６４が形成されている。 A wall 3 is formed between the first protrusion 1 and the second protrusion 2. When viewed from the central first protrusion 1 shown in FIG. 7, four wall portions 31, 32, 33, and 34 that are continuous from the four second protrusions 2 are formed. And the four wall part parts 31-34 are connected by wall part part 31 ', 32', 33 ', 34' in the sheet | seat in-plane direction, and the cyclic | annular wall part 3 is comprised in series. . There is a ridge portion which is the back of the horse between the first protrusions adjacent on the first surface side of the wall portions 31 ′, 32 ′, 33 ′, 34 ′, and that portion becomes the ridge portion 6. Corresponding to each of the wall portions 31 ′ to 34 ′, ridge portions 61 to 64 are formed.
図８（ａ）は図７に示した壁部３を展開して長方形のモデルで示したものであり、そこに図示された線ｇ１は繊維の配向方向を示している。壁部部分の位置を表すために、さらに、上記環状の壁部を円柱として、その母船に直交する面で切断した横断面でみたときに９０°ごとに異なる位置として３１〜３４の符号を加入して示している。図８（ａ）に示したように、本実施形態の壁部３はいずれの箇所においても壁部の起立方向に配向している。そして、本実施形態においては、０°位置（壁部部分３１）と１８０°位置（壁部部分３３）は第２面側（ｚ２）側に偏倚した状態でその強い配向性（線ｇ１ｂ）を示す部分が位置しており、他方、９０°位置（壁部部分３２）と２７０°位置（壁部部分３４）は第１面側（ｚ１）側に偏倚した状態でその強い配向性（線ｇ１ａ）を示す部分が位置している。同図では図が混み合うため図示していないが、壁部部分３１’〜３４’においても同様であり、全面的に同様の繊維配向性を有している。ただし、強い配向性を示す壁部部分は３１、３２、３３、３４と変化するその中間位置で全体において漸次変化する環状の壁部の配向性の構造を構成している。これにより本実施形態において特有のクッション性を生じることは前述のとおりであり。
一方、例えば、繊維ウェブを賦形する前に融着し所定の配向性が与えられた不織布にエンボス加工等によりくぼみを与え場合は、通常図８（ｂ）のように環状の壁部を平面視において９０°ごとに分割してみると、その分割位置ごとに繊維配向性が変わることとなる。具体的には同図に示したとおり壁部部分３１、３３ではその起立方向（線ｇ１ｃ）に繊維が配向するが、壁部部分３２、３４ではそれと直交する方向（線ｇ２）に繊維が配向する。
8 (a) is an illustration a rectangular model expand wall 3 shown in FIG. 7, line g 1 illustrated therein represents the orientation direction of the fibers. In order to represent the position of the wall portion, the reference numerals 31 to 34 are added as positions that differ every 90 ° when viewed in a cross section cut along a plane orthogonal to the mother ship, with the annular wall portion as a cylinder. As shown. As shown to Fig.8 (a), the wall part 3 of this embodiment is orientated in the standing direction of the wall part in any location. In the present embodiment, the 0 ° position (wall portion 31) and the 180 ° position (wall portion 33) are biased toward the second surface side (z 2 ) and have a strong orientation (line g 1b). ), And the 90 ° position (wall portion 32) and the 270 ° position (wall portion 34) are strongly oriented in a state of being biased to the first surface side (z 1 ) side. A portion indicating (line g 1a ) is located. Although not shown in the figure because the figures are crowded, the same applies to the wall portions 31 ′ to 34 ′, and the same fiber orientation is obtained over the entire surface. However, the wall portion showing a strong orientation constitutes an orientation structure of an annular wall portion that gradually changes as a whole at the intermediate positions changing as 31, 32, 33, and 34. As described above, this produces a cushioning characteristic peculiar to the present embodiment.
On the other hand, for example, when embossing or the like is given to a nonwoven fabric that has been fused and given a predetermined orientation before shaping the fiber web, the annular wall is usually flat as shown in FIG. If it divides | segments every 90 degrees visually, fiber orientation will change for every division | segmentation position. Specifically, the fibers are oriented in the standing direction (line g 1c ) in the wall portions 31 and 33 as shown in the figure, whereas the fibers are oriented in the direction (line g 2 ) perpendicular to the wall portions 32 and 34. Are oriented.
図９は図７に示した第２突出部２を１つ取り出した状態で繊維の配向方向（線ｇ３）をモデル的に示している。その位置を特定するために壁部部分の符号をその対応する位置に付している。同図に示したとおり、本実施形態においては、第２突出部２の頂部２１に向かって収束する放射状の繊維配向性を有している。このことはつまり、上記壁部との関係を併せていうと、壁部３から第２突出部２にわたってそのシート面の面方向に沿って第２突出部の頂部２１に向かって収束するように繊維が配向していることを示している。このように、第２突出部頂部２１に放射上の繊維配向性があることで、外観の均一性、形状保持性および高吸収性能などという作用を奏する。 FIG. 9 schematically shows the fiber orientation direction (line g 3 ) in a state where one second protrusion 2 shown in FIG. 7 is taken out. In order to specify the position, the code | symbol of a wall part is attached | subjected to the corresponding position. As shown in the figure, in this embodiment, the fiber has a radial fiber orientation that converges toward the top 21 of the second protrusion 2. In other words, when the relationship with the wall portion is mentioned together, the fibers are converged from the wall portion 3 to the second protrusion portion 2 so as to converge toward the top portion 21 of the second protrusion portion along the surface direction of the sheet surface. Is oriented. Thus, there exists an effect | action of uniformity of an external appearance, shape retainability, high absorption performance, etc. by having the fiber orientation in radiation | emission in the 2nd protrusion part top part 21. FIG.
本実施形態の不織布における寸法諸元について以下に説明する。
シートの厚さについては、不織布１０の全体としてみたときの厚さをシート厚み（Ｔ）といい、その凹凸に湾曲したシートの局部的な厚さを層厚み（Ｓ）として区別する（図２参照）。シート厚み（Ｔ）は用途によって適宜調節すればよいが、おむつや生理用品等の表面シートとして用いることを考慮すると、１．８ｍｍ〜４．５ｍｍが好ましく、２．２ｍｍ〜４．２ｍｍがより好ましい。その範囲とすることにより、適度な立体感のある良好な外観と、優れた吸収性能を両立することができる。層厚みは、シート内の各部位において異なっていてよく、用途によって適宜調節すればよい。おむつや生理用品等の表面シートとして用いることを考慮すると、第１突出部頂部の層厚み（Ｓ１）は０．１ｍｍ〜１ｍｍであることが好ましく、０．２ｍｍ〜０．８ｍｍがより好ましい。好ましい層厚みの範囲としては第２突出部頂部の層厚み（Ｓ２）及び壁部の層厚み（Ｓ３）も同様である。
本実施形態の不織布１０においては、第１突出部１の層厚みＳ１、第２突出部の層厚みＳ２、及び壁部の層厚みＳ３は、実質的に同じである。ここで実質的に同じとは、それぞれの断面を観察したときに、ほぼ同じ厚みであることを意味する。このような形態の不織布とすることにより、外観の均一性、および安定した吸収性能およびクッション性を得ることができ好ましい。
The dimension specification in the nonwoven fabric of this embodiment is demonstrated below.
Regarding the thickness of the sheet, the thickness of the nonwoven fabric 10 as a whole is referred to as the sheet thickness (T), and the local thickness of the sheet curved in the unevenness is distinguished as the layer thickness (S) (FIG. 2). reference). The sheet thickness (T) may be appropriately adjusted depending on the use, but considering use as a surface sheet for diapers, sanitary products, etc., 1.8 mm to 4.5 mm is preferable, and 2.2 mm to 4.2 mm is more preferable. . By setting it as the range, it is possible to achieve both a good appearance with an appropriate stereoscopic effect and an excellent absorption performance. The layer thickness may be different at each site in the sheet, and may be appropriately adjusted depending on the application. In consideration of use as a surface sheet of diapers, sanitary products, etc., the layer thickness (S 1 ) of the top of the first protrusion is preferably 0.1 mm to 1 mm, and more preferably 0.2 mm to 0.8 mm. The preferred layer thickness ranges are the same for the layer thickness (S 2 ) at the top of the second protrusion and the layer thickness (S 3 ) at the wall.
In the nonwoven fabric 10 of the present embodiment, the layer thickness S 1 of the first projecting portion 1, the layer thickness S 3 of layer thickness S 2, and the wall portion of the second projecting portion are substantially the same. Here, “substantially the same” means that the thickness is substantially the same when each cross section is observed. By setting it as the nonwoven fabric of such a form, the uniformity of an external appearance and the stable absorption performance and cushioning property can be obtained, and it is preferable.
本実施形態の不織布は乾燥時と湿潤時で厚みがほぼ変化しないことが好ましい。すなわち、下記厚み変化率において８５〜１１５％であることが好ましく、更には９０〜１１０％であることがより好ましい。
厚み変化率（％）＝湿潤時厚み（ｍｍ）／乾燥時厚み（ｍｍ）×１００ （数式１）
・乾燥時厚み
常温（２３℃、５０％ＲＨ）環境下に２４時間静置した後の、シートの厚み。
・湿潤時厚み
シートを、常温（２３℃、５０％ＲＨ）環境下に２４時間静置する。シートより大きい平面状の容器に、イオン交換水を１０ｍｍの高さになるまで入れる。この容器にシートを入れ、１時間後に取り出す。このシートの厚み。
It is preferable that the thickness of the non-woven fabric of this embodiment hardly changes between dry and wet. That is, in the following thickness change rate, it is preferably 85 to 115%, and more preferably 90 to 110%.
Thickness change rate (%) = wet thickness (mm) / dry thickness (mm) × 100 (Equation 1)
-Thickness at the time of drying The thickness of a sheet | seat after leaving still for 24 hours in normal temperature (23 degreeC, 50% RH) environment.
-Thickness when wet The sheet is allowed to stand in a normal temperature (23 ° C., 50% RH) environment for 24 hours. Ion exchange water is put into a flat container larger than the sheet until the height becomes 10 mm. The sheet is put into this container and taken out after 1 hour. The thickness of this sheet.
本実施形態においては、第１突出部１、第２突出部２、壁部３がシート厚み（Ｔ）において３等分されており、各部の区分は特に断らない限りこのようにして定義する。したがって、これらの厚みはシート厚み（Ｔ）によって自ずと定まる（Ｐ１＝Ｐ２＝Ｐ３）。ただし、第１突出部１と第２突出部２との頂部の尖度ないし曲率が異なるときには、断面において直線状になった比較的狭い部分を壁部３とし、そこから湾曲しし丸みを帯びいく領域をそれぞれ第１突出部１及び第２突出部２としてもよい（Ｐ１，Ｐ’２，Ｐ’３参照）。後者の定義によるなら、本実施形態の不織布１０においては、第２突出部２の厚み（Ｐ’２）が第１突出部１の厚み（Ｐ１）より大きく、全体において厚み方向に偏倚のある形態とされている。換言すれば、本実施形態においては、第１突出部頂部１の頂部１１の曲率半径が第２突出部頂部２の頂部２１の曲率半径より大きくされている。 In this embodiment, the 1st protrusion part 1, the 2nd protrusion part 2, and the wall part 3 are equally divided into 3 in sheet | seat thickness (T), and the division of each part is defined in this way unless there is particular notice. Accordingly, these thicknesses are naturally determined by the sheet thickness (T) (P 1 = P 2 = P 3 ). However, when the kurtosis or curvature of the tops of the first projecting portion 1 and the second projecting portion 2 are different, a relatively narrow portion that is linear in the cross section is used as the wall portion 3, and the curved portion is rounded and rounded therefrom. optionally a go area as the first projecting portion 1 and the second projecting portions 2 respectively (P 1, P reference '2, P' 3). According to the latter definition, in the nonwoven fabric 10 of the present embodiment, the thickness (P ′ 2 ) of the second protrusion 2 is larger than the thickness (P 1 ) of the first protrusion 1, and there is a bias in the thickness direction as a whole. It is in the form. In other words, in this embodiment, the radius of curvature of the top portion 11 of the first protrusion top portion 1 is larger than the radius of curvature of the top portion 21 of the second protrusion top portion 2.
第１面側の半身厚み（ｔ１）及び第２面側の半身厚み（ｔ２）も上記と同様であり、基本的には、シート厚み（Ｔ）を２等分した線を中央線（中央面）ｍとし、両半身厚み（ｔ１，ｔ２）が等しいものとしてみる。ただし、第１突出部１と第２突出部２との頂部における尖度もしくは曲率半径に差がある場合には、壁部の断面直線状部分の中央と評価される位置ｍ’で区分し定義することができる。本実施形態の不織布は、後者の定義によるならば、第１面側の半身厚みｔ１＜第２面側の半身厚みｔ２とされている。 The half thickness (t 1 ) on the first surface side and the half thickness (t 2 ) on the second surface side are the same as described above. Basically, the line obtained by dividing the sheet thickness (T) into two equal parts is the center line ( It is assumed that the center plane is m and the thicknesses (t 1 , t 2 ) are equal. However, if there is a difference in the kurtosis or the radius of curvature at the top of the first protrusion 1 and the second protrusion 2, it is defined by the position m ′ evaluated as the center of the straight section of the wall section. can do. According to the latter definition, the non-woven fabric of the present embodiment satisfies the first-surface-side half thickness t 1 <the second-surface-side half thickness t 2 .
第１突出部１及び第２突出部２がなす列の間隔ｎ（図５参照）は、用途によって適宜調節すればよいが、おむつや生理用品等の表面シートとして用いることを考慮すると、１ｍｍ〜１２ｍｍが好ましく、２．５ｍｍ〜６ｍｍがより好ましい。 The interval n (see FIG. 5) between the rows formed by the first projecting portion 1 and the second projecting portion 2 may be appropriately adjusted depending on the application, but considering that it is used as a surface sheet for diapers, sanitary products, etc. 12 mm is preferable, and 2.5 mm to 6 mm is more preferable.
本実施形態の不織布１０の製造方法はこの種の製品に一般的な方法を適宜採用すればよい。一例を挙げると、下記のような態様が挙げられる。融着する前の繊維ウェブを、所定の厚みとなるようカード機からウェブ賦形装置に供給する。ウェブ賦形装置では、まず常温（約２３℃）の空気を供給して、多数の突起９（図２参照）を有し通気性を有する台座（図示せず）の上に上記繊維ウェブを定着させる。次いで、その台座上の繊維ウェブに熱風ｈ（図２参照）を各繊維が適度に融着可能な温度で吹きつけて、前記台座上の突起９にそって繊維ウェブを賦形するとともに、各繊維を融着させる。このときの熱風の温度は、この種の製品に用いられる一般的な繊維材料を考慮すると、１３０〜１６０℃にすることが好ましく、風速は２０〜８０ｍ／ｓにすることが好ましい。連続生産を考慮すると、上記台座を搬送可能なコンベア式のものとし、搬送されてくる型付けされた不織布を、ロールで巻き取っていく態様が挙げられる。なお、本実施形態の不織布についてＭＤ方向及びＣＤ方向をどちらに向けてもよいが、図５に示したモデル図でいうと縦方向をＭＤ方向とすることが好ましい。なお、「ＭＤ」は不織布等のシート材が製造時に流れる方向をいい、「Machine Direction」の略語である。流れ方向ともいう。「ＣＤ」は上記ＭＤに直交する方向であり、「Cross Direction」の略語である。 The manufacturing method of the nonwoven fabric 10 of this embodiment should just employ | adopt a method general to this kind of product suitably. If an example is given, the following aspects will be mentioned. The fiber web before being fused is supplied from the card machine to the web shaping device so as to have a predetermined thickness. In the web shaping apparatus, first, air at normal temperature (about 23 ° C.) is supplied, and the fiber web is fixed on a pedestal (not shown) having a large number of protrusions 9 (see FIG. 2) and air permeability. Let Next, hot air h (see FIG. 2) is blown onto the fiber web on the pedestal at a temperature at which each fiber can be appropriately fused, and the fiber web is shaped along the protrusions 9 on the pedestal. The fibers are fused. The temperature of the hot air at this time is preferably 130 to 160 ° C. and the wind speed is preferably 20 to 80 m / s in consideration of a general fiber material used for this type of product. In consideration of continuous production, there is a mode in which the pedestal is transportable and the typed nonwoven fabric that is being conveyed is wound up by a roll. In addition, although the MD direction and the CD direction may be directed to the nonwoven fabric of this embodiment, it is preferable that the longitudinal direction is the MD direction in the model diagram shown in FIG. “MD” refers to a direction in which a sheet material such as a nonwoven fabric flows during manufacturing, and is an abbreviation of “Machine Direction”. Also called flow direction. “CD” is a direction orthogonal to the MD and is an abbreviation of “Cross Direction”.
本発明の不織布に用いることができる繊維材料は特に限定されない。具体的には、下記の繊維などが挙げられる。ポリエチレン（ＰＥ）繊維、ポリプロピレン（ＰＰ）繊維等のポリオレフィン繊維；ポリエチレンテレフタレート（ＰＥＴ）、ポリアミド等の熱可塑性樹脂を単独で用いてなる繊維；芯鞘型、サイドバイサイド型等の構造の複合繊維、例えば鞘成分がポリエチレン又は低融点ポリプロピレンである芯鞘構造の繊維が好ましく挙げられ、該芯／鞘構造の繊維の代表例としては、ＰＥＴ（芯）／ＰＥ（鞘）、ＰＰ（芯）／ＰＥ（鞘）、ＰＰ（芯）／低融点ＰＰ（鞘）等の芯鞘構造の繊維。更に具体的には、上記構成繊維は、ポリエチレン繊維、ポリプロピレン繊維等のポリオレフィン系繊維、ポリエチレン複合繊維、ポリプロピレン複合繊維を含むのが好ましい。ここで、該ポリエチレン複合繊維の複合組成は、ポリエチレンテレフタレート／ポリエチレンであり、該ポリプロピレン複合繊維の複合組成が、ポリエチレンテレフタレート／低融点ポリプロピレンであるのが好ましく、より具体的には、ＰＥＴ（芯）／ＰＥ（鞘）、ＰＥＴ（芯）／低融点ＰＰ（鞘）が挙げられる。また、これらの繊維は、単独で用いて不織布を構成してもよいが、２種以上を組み合わせて用いることもできる。 The fiber material that can be used for the nonwoven fabric of the present invention is not particularly limited. Specific examples include the following fibers. Polyolefin fibers such as polyethylene (PE) fibers and polypropylene (PP) fibers; fibers using a thermoplastic resin such as polyethylene terephthalate (PET) and polyamide alone; composite fibers having a structure such as a core-sheath type and a side-by-side type, such as A core-sheath structure fiber in which the sheath component is polyethylene or low-melting-point polypropylene is preferable, and typical examples of the core / sheath structure fiber include PET (core) / PE (sheath), PP (core) / PE ( Sheath), fibers having a core-sheath structure such as PP (core) / low melting point PP (sheath). More specifically, the constituent fibers preferably include polyolefin fibers such as polyethylene fibers and polypropylene fibers, polyethylene composite fibers, and polypropylene composite fibers. Here, the composite composition of the polyethylene composite fiber is polyethylene terephthalate / polyethylene, and the composite composition of the polypropylene composite fiber is preferably polyethylene terephthalate / low melting point polypropylene, and more specifically, PET (core). / PE (sheath), PET (core) / low melting point PP (sheath). These fibers may be used alone to form a nonwoven fabric, but may be used in combination of two or more.
本発明の不織布は、各種用途に用いることができる。例えば、使い捨ておむつや、生理用ナプキン、パンティーライナー、尿取りパッド等の吸収性物品のシートとして好適に使用することができる。なかでも、シートの両面が網状構造であることに起因する通気性や液拡散性、押圧力時の変形特性、などに優れていることから、おむつや生理用品等の表面シートと吸収体との間に介在させるサブレイヤーとして用いることが好ましい。その他、 表面シート、ギャザー、外装シート、ウイング として利用する形態も挙げられる。 The nonwoven fabric of this invention can be used for various uses. For example, it can be suitably used as a sheet for absorbent articles such as disposable diapers, sanitary napkins, panty liners, urine absorbing pads and the like. Above all, because it is excellent in air permeability and liquid diffusibility due to the network structure on both sides of the sheet, deformation characteristics under pressure, etc., the surface sheet such as diapers and sanitary products and absorbents It is preferable to use it as a sublayer interposed therebetween. In addition, the form used as a surface sheet, gathers, an exterior sheet, and a wing is also mentioned.
以下、実施例に基づき本発明を更に詳細に説明するが、本発明はこれらの実施例により限定して解釈されるものではない。 EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is limited and interpreted by these Examples.
（実施例１）
芯がポリエチレンテレフタレートで鞘がポリエチレンからなる２．２ｄｔｅｘ×５１ｍｍの芯鞘型複合繊維を坪量２７ｇ／ｍ２となるようカード機からウェブ賦形装置に供給した。ウェブ賦形装置では、常温の空気を供給して、多数の突起を有し通気性を有する台座の上に上記繊維ウェブを定着させた。この台座の突起のピッチ（突起の平面視における中心間の距離）を４ｍｍとし、突出高さを８ｍｍとした。次いで、その台座上の繊維ウェブに熱風（温度１３０℃、風速５０ｍ／ｓ）を吹きつけて賦形し、前記台座上の突起にそって繊維ウェブを賦形するとともに、熱風を温度１４５℃、風速５ｍ／ｓの条件に切り替えて各芯鞘構造の繊維を融着させた。このときのライン速度は１００ｍ／ｍｉｎとした。このように熱融着して賦形した不織布を取り出し、不織布試験体１とした。実施例１で得た不織布試験体の断面写真（図１０）及びこれを０．５ｇ／ｃｍ２の圧力で加圧したときの断面写真（図１１）を示した。
Example 1
A 2.2 dtex × 51 mm core-sheath type composite fiber having a core of polyethylene terephthalate and a sheath of polyethylene was supplied from the card machine to the web shaping device so that the basis weight was 27 g / m 2 . In the web shaping device, normal temperature air was supplied to fix the fibrous web on a pedestal having a large number of protrusions and air permeability. The pitch of the protrusions on this pedestal (distance between the centers in the plan view of the protrusions) was 4 mm, and the protrusion height was 8 mm. Next, hot air (temperature 130 ° C., wind speed 50 m / s) is blown onto the fiber web on the pedestal, and the fiber web is shaped along the protrusions on the pedestal. The core-sheath structure fibers were fused by switching to a wind speed of 5 m / s. The line speed at this time was 100 m / min. The nonwoven fabric shaped by heat sealing in this manner was taken out and used as a nonwoven fabric test body 1. The cross-sectional photograph (FIG. 10) of the nonwoven fabric test body obtained in Example 1 and the cross-sectional photograph (FIG. 11) when this was pressurized with a pressure of 0.5 g / cm 2 are shown.
（実施例２）
上記実施例１における台座の突起のピッチを５ｍｍとした以外同様にして不織布試験体２を得た。
(Example 2)
A nonwoven fabric test body 2 was obtained in the same manner except that the pitch of the protrusions on the base in Example 1 was changed to 5 mm.
（比較例１）
特開２００８−２５０８１号公報の実施例１と同様にして、蛇腹状の形態を有する不織布ｃ１を作製した。具体的には以下のとおりである。
第１繊維層として、低密度ポリエチレン（融点１１０℃）とポリエチレンテレフタレートの芯鞘構造で、平均繊度３．３ｄｔｅｘ、平均繊維長５１ｍｍ、親水油剤がコーティングされた繊維Ａ、および高密度ポリエチレン（融点１３５℃）とポリエチレンテレフタレートの芯鞘構造で、平均繊度３．３ｄｔｅｘ、平均繊維長５１ｍｍ、撥水油剤がコーティングされた繊維Ｂとが混合された繊維層を使用した。繊維Ａと繊維Ｂは７０：３０の混合比で含有され、坪量は１５ｇ／ｍ２に調整した。
第２繊維層として、高密度ポリエチレンとポリエチレンテレフタレートの芯鞘構造で、平均繊度４．４ｄｔｅｘ、平均繊維長３８ｍｍ、親水油剤がコーティングされた繊維１００％の繊維層を使用した。この繊維層における坪量は２５ｇ／ｍ２であった。
特開２００８−２５０８１号公報の図８、図９に示されたものと同様の装置を用い、前記のようにして積層した繊維を搬送しながら、これに前記装置の吹き出し部から温度１０５℃、風量１２００ｌ／ｍｉｎの条件で熱風を吹き当て蛇腹状の形態を有する不織布試験体ｃ１を得た。
(Comparative Example 1)
A nonwoven fabric c1 having a bellows-like shape was produced in the same manner as in Example 1 of JP-A-2008-25081. Specifically, it is as follows.
As the first fiber layer, low-density polyethylene (melting point 110 ° C.) and polyethylene terephthalate core-sheath structure, average fineness 3.3 dtex, average fiber length 51 mm, fiber A coated with a hydrophilic oil agent, and high-density polyethylene (melting point 135 ° C) and a core-sheath structure of polyethylene terephthalate, and a fiber layer in which an average fineness of 3.3 dtex, an average fiber length of 51 mm, and a fiber B coated with a water-repellent oil agent was used. Fiber A and Fiber B were contained at a mixing ratio of 70:30, and the basis weight was adjusted to 15 g / m 2 .
As the second fiber layer, a fiber layer having a core-sheath structure of high-density polyethylene and polyethylene terephthalate, an average fineness of 4.4 dtex, an average fiber length of 38 mm, and a fiber coated with a hydrophilic oil agent was used. The basis weight in this fiber layer was 25 g / m 2 .
Using a device similar to that shown in FIG. 8 and FIG. 9 of Japanese Patent Application Laid-Open No. 2008-25081, while transporting the fibers laminated as described above, a temperature of 105 ° C. from the blowing part of the device is supplied to this. A non-woven fabric test body c1 having a bellows shape was obtained by blowing hot air under the condition of an air volume of 1200 l / min.
（比較例２）
特開平０３−１３７２５８号公報の実施例１と同様にして、開孔を有する不織布を作製した。具体的には以下のとおりである。
ポリエチレンテレフタレート−ポリエチレンの芯鞘繊維３デニール×５１ｍｍからなるウェブを定法のカード機で形成した。次いで、該ウェブを通気性を有する凹凸ネット及び平織りネットの間に挟持し、該平織りネット側から空気を噴射した。そして前記凹凸ネットの凹部にウェブを押し込むことにより、繊維の粗密部分が所定のピッチで形成されたウェブを作製した。その後、この状態のウェブを１４０℃の加熱空気中に通し、ポリエチレン部分を溶着し、該ウェブを一体化させた。これにより、凹凸状態が所定のピッチで形成され、凹状部分に開孔した不織布試験体ｃ２を作製した。
(Comparative Example 2)
In the same manner as in Example 1 of JP-A-03-137258, a non-woven fabric having pores was produced. Specifically, it is as follows.
A web composed of polyethylene terephthalate-polyethylene core-sheath fiber 3 denier × 51 mm was formed by a standard carding machine. Next, the web was sandwiched between an uneven net having air permeability and a plain weave net, and air was jetted from the plain weave net side. And the web in which the density part of the fiber was formed in the predetermined pitch was produced by pushing a web into the recessed part of the said uneven | corrugated net. Thereafter, the web in this state was passed through heated air at 140 ° C., and the polyethylene part was welded to integrate the web. Thereby, the uneven | corrugated state was formed with the predetermined pitch, and the nonwoven fabric test body c2 which was opened to the concave part was produced.
上記の不織布試験体を用い、下記の測定試験を行った。 The following measurement test was performed using the above-mentioned nonwoven fabric test body.
上記の結果より、本発明の好ましい実施形態に係る不織布（実施例）は、比較例のものに比して、通気性が良好であり、クッション性及び変形性が高く、吸収速度が速くべた付かない肌に優しい特性において優れることが分かる。 From the above results, the nonwoven fabrics (Examples) according to the preferred embodiments of the present invention have better air permeability, higher cushioning and deformability, and faster stickiness than the comparative examples. It turns out that it is excellent in the characteristics that are kind to the skin.
上記実施例で行ったものを含め各評価項目の測定方法は下記のとおりである。
＜厚み＞
直径５０〜６０ｍｍ、荷重０．５ｇｆ／ｃｍ２となるアルミ円板を準備した。このアルミ円板を載せたシートの厚みを、レーザー変位計を用いて測定した。測定は、シートの任意の場所（但しアルミ円板が重ならない場所）を５点測定し、その平均値をそのシートの厚みＴ０．５とした。また、アルミ円板の荷重を５０ｇｆ／ｃｍ２としたときの値を、厚みＴ５０とした。
＜接触面積＞
荷重０．５ｇｆ／ｃｍ２となる透明アクリル板を準備した。この透明アクリル板をシートに載せ、中央部５ｃｍ以上×５ｃｍ以上（面積Ｓａ）の範囲において、マイクロスコープＶＨＸ−１０００（株式会社キーエンス製、商品名）にて５倍ズームで観察しながら、透明アクリル板とシートが接触している各領域をＶＨＸ−９００のフリーライン機能を使用して囲み、その囲まれた面積を計測した。計測した各接触領域の面積の合計をＳ０．５とした。
また、透明アクリル板をシートに載せ、さらにシートへの荷重が均一に５０ｇｆ／ｃｍ２となるように、透明アクリル板の端部に重りを載せて調整した。その後、前記同様に各接触領域の面積を計測した。計測した各接触領域の面積の合計をＳ５０とした。
＜圧縮硬さ（ＬＣ）＞
不織布の圧縮硬さ（ＬＣ）は、風合い計測システムＫＥＳ−ＦＢ３−ＡＵＴＯ−Ａ（カトーテック株式会社製、商品名）を使用して測定した。測定時の設定は、感度２，圧縮速さ５０秒／ｍｍ、データ取込感覚０．１秒、加圧面積２ｃｍ２（付属治具）とし、また測定するシートの大きさは１５ｃｍ×１５ｃｍとし、測定台の中央に配置した。測定器の基準設定に従い３カ所の測定を行い、その平均値を測定値とした。
＜クッション性＞
シートを上から評価者の手で押したり戻したりした時の感触を評価した。評価者は３人とし、多かった意見をそのシートの評価結果とした。
測定結果の評価を実用上の要求を考慮し以下のように区別した。
Ａ： 押した時および戻した時に、バネのような反発感を感じる。
Ｂ： 押した時および戻した時に、バネのような反発感はあるが、弱い。もしくは、押した時または戻した時のどちらかのみ、バネのような反発感を感じる。
Ｃ： 押した時および戻した時に、バネのような反発感を感じない。
＜易変形性＞
シートを折り曲げた時の感触を評価した。評価者は３人とし、多かった意見をそのシートの評価結果とした。
測定結果の評価を実用上の要求を考慮し以下のように区別した。
Ａ：折り曲げた時に柔らかく感じる。また自然に折れ曲がる。
Ｂ：折り曲げた時に多少硬く感じる。もしくは、折り曲げた時に折れ曲がり線が発生する。
Ｃ：折り曲げた時に硬く感じる。もしくは、折り曲げた時に折れ曲がり線が発生する。
＜吸収速度＞
２８０×１６０ｍｍに切り出した不織布試験体を、サブレイヤー（芯がポリエチレンテレフタレートで鞘がポリエチレンからなる３．３ｄｔｅｘの芯鞘型複合繊維を構成繊維とする坪量２０ｇ／ｍ２のウェブ、および芯がポリプロピレンで鞘がポリエチレンからなる７．８ｄｔｅｘの芯鞘型複合繊維を構成繊維とする坪量２０ｇ／ｍ２のウェブを重ね合わせて作製したエアースルー不織布）を介して、パルプ吸収体の上に設置した。上記不織布上に２０ｇ／ｃｍ２の荷重を均等にかけ、試験体のほぼ中央に設置した内直径３６ｍｍの筒を当て、そこから生理食塩水を注入した。その後、１０分ごとに４０ｇずつ３回にわたり生理食塩水を注入し、３回目を注入した際の吸収しきる時間（秒）を測定した。各試料の測定結果を下表１に示した。
測定結果の評価を実用上の要求を考慮し以下のように区別した。
Ａ：吸収しきる時間が１８０秒以内。
Ｂ：吸収しきる時間が１８０秒〜３００秒。
Ｃ：吸収しきる時間が３００秒以上。
＜液戻り性＞
前記吸収速度評価において、３回目を注入した１０分後に、注入部を中心として、その上にろ紙（ＡＤＶＡＮＴＥＣ東洋製４Ａ、大きさ１００ｍｍ×１００ｍｍ）２０枚を乗せ、更にその上に３．５ｋＰａ（３．５ｋｇ、大きさ１００ｍｍ×１００ｍｍ）の重りを乗せる。重りを乗せてから２分後にろ紙を外す。ろ紙の初期重量と加圧後重量の差分を液戻り量として測定する。
測定結果の評価を実用上の要求を考慮し以下のように区別した。
Ａ：液戻り量が０．５ｇ以下。
Ｂ：液戻り量が０．５〜１ｇ。
Ｃ：液戻り量が１ｇ以上。
The measuring method of each evaluation item including what was performed in the said Example is as follows.
<Thickness>
An aluminum disk having a diameter of 50 to 60 mm and a load of 0.5 gf / cm 2 was prepared. The thickness of the sheet on which the aluminum disk was placed was measured using a laser displacement meter. In the measurement, five points were measured at arbitrary locations on the sheet (where the aluminum disks do not overlap), and the average value was defined as the thickness T 0.5 of the sheet. Further, the value when the load of the aluminum disk was 50 gf / cm 2 was defined as the thickness T 50 .
<Contact area>
A transparent acrylic plate having a load of 0.5 gf / cm 2 was prepared. This transparent acrylic plate is placed on a sheet, and a clear acrylic is observed with a microscope VHX-1000 (manufactured by Keyence Co., Ltd., trade name) at a magnification of 5 × in the range of 5 cm to 5 cm (area Sa) in the center. Each area where the plate and the sheet were in contact was enclosed using the free line function of VHX-900, and the enclosed area was measured. The total area of the contact area measured was S 0.5.
Moreover, the transparent acrylic board was mounted on the sheet | seat, and also the weight was put on the edge part of the transparent acrylic board and adjusted so that the load to a sheet | seat might become 50 gf / cm < 2 > uniformly. Thereafter, the area of each contact region was measured in the same manner as described above. The total area of the contact area measured was S 50.
<Compression hardness (LC)>
The compression hardness (LC) of the nonwoven fabric was measured using a texture measurement system KES-FB3-AUTO-A (trade name, manufactured by Kato Tech Co., Ltd.). The measurement settings are: sensitivity 2, compression speed 50 seconds / mm, data capture sensation 0.1 seconds, pressurization area 2 cm 2 (attached jig), and the size of the sheet to be measured is 15 cm × 15 cm And placed in the center of the measuring table. Measurements were made at three locations according to the standard settings of the measuring instrument, and the average value was taken as the measured value.
<Cushioning>
The feel when the sheet was pushed or returned by the evaluator's hand from above was evaluated. The number of evaluators was three, and the opinion that was often used was the evaluation result of the sheet.
The evaluation of the measurement results was distinguished as follows in consideration of practical requirements.
A: A feeling of resilience like a spring is felt when pushing and returning.
B: When pressed and returned, there is a feeling of resilience like a spring, but it is weak. Or, it feels a spring-like rebound only when it is pushed or returned.
C: When pressed and returned, there is no feeling of resilience like a spring.
<Easily deformable>
The feel when the sheet was folded was evaluated. The number of evaluators was three, and the opinion that was often used was the evaluation result of the sheet.
The evaluation of the measurement results was distinguished as follows in consideration of practical requirements.
A: Feels soft when folded. It also bends naturally.
B: Feels somewhat stiff when folded. Alternatively, a bent line is generated when it is bent.
C: Feels hard when bent. Alternatively, a bent line is generated when it is bent.
<Absorption rate>
A non-woven fabric specimen cut out to 280 × 160 mm was sub-layered (a web having a basis weight of 20 g / m 2 and a core comprising 3.3 dtex core-sheath composite fiber having a core made of polyethylene terephthalate and a sheath made of polyethylene) Air-through non-woven fabric produced by superimposing a 20 g / m 2 basis weight web comprising a 7.8 dtex core-sheath composite fiber of which the sheath is made of polyethylene and made of polypropylene. did. A load of 20 g / cm 2 was evenly applied on the nonwoven fabric, and a cylinder with an inner diameter of 36 mm placed at the approximate center of the test specimen was applied, and physiological saline was injected therefrom. Thereafter, physiological saline was injected three times at a rate of 40 g every 10 minutes, and the time (seconds) to be absorbed when the third injection was performed was measured. The measurement results of each sample are shown in Table 1 below.
The evaluation of the measurement results was distinguished as follows in consideration of practical requirements.
A: Time to absorb is within 180 seconds.
B: Absorption time is 180 seconds to 300 seconds.
C: Absorption time is 300 seconds or more.
<Liquid returnability>
In the absorption rate evaluation, 10 minutes after the third injection, 20 filter papers (ADVANTEC Toyo 4A, size 100 mm × 100 mm) were placed on the injection part, and 3.5 kPa (3.5 kPa ( 3.5kg, size 100mm x 100mm). Remove the filter paper 2 minutes after placing the weight. The difference between the initial weight of the filter paper and the weight after pressurization is measured as the liquid return amount.
The evaluation of the measurement results was distinguished as follows in consideration of practical requirements.
A: Liquid return amount is 0.5 g or less.
B: The liquid return amount is 0.5 to 1 g.
C: Liquid return amount is 1 g or more.
１ 第１突出部
１１ 第１突出部頂部
１１ａ 第１突出部頂部 第１面側
１１ｂ 第１突出部頂部 第２面側
１ｋ 第１突出部 内部空間
２ 第２突出部
２１ 第２突出部頂部
２１ａ 第２突出部頂部 第１面側
２１ｂ 第２突出部頂部 第２面側
２ｋ 第２突出部 内部空間
３ 壁部
６ 尾根部
９ 突起
１０ 不織布
Ｔ シート厚み
Ｓ（Ｓ１，Ｓ２，Ｓ３） 層厚み
Ｖ１、Ｖ２ 網状連続空間
DESCRIPTION OF SYMBOLS 1 1st protrusion part 11 1st protrusion part top part 11a 1st protrusion part top part 1st surface side 11b 1st protrusion part top part 2nd surface side 1k 1st protrusion part Internal space 2 2nd protrusion part 21 2nd protrusion part top part 21a second projection top first surface 21b second protrusion top second face 2k second projecting portion internal space 3 wall 6 ridges 9 projections 10 nonwoven T sheet thickness S (S 1, S 2, S 3) Layer thickness V 1 , V 2 network continuous space
Claims (8)
第１面側に突出する第１突出部と第２面側に突出する第２突出部とが面内の第１方向と第２方向との２つの方向に向け壁部を介して複数交互に広がり、前記壁部は環状をなし、該環状に沿ういずれの箇所においても壁部の起立方向への繊維配向性を有しており、
前記不織布の複数の第１突出部及び複数の第２突出部に対する接触平面をそれぞれ想定したとき、そのいずれの側においても、該接触平面と前記不織布との間に面方向に広がる網目状の空間が形成される不織布。 A non-woven fabric having a compression hardness of 0.01 to 0.35,
A plurality of first projecting portions projecting to the first surface side and second projecting portions projecting to the second surface side alternately in two directions, ie, the first direction and the second direction within the surface, through the wall portion. Spread, the wall portion is annular, and has a fiber orientation in the standing direction of the wall portion at any location along the annular shape,
When a contact plane for the first protrusion and the plurality of second protrusions multiple of the nonwoven fabric assumes respectively, mesh-like space extending in the planar direction between its either side, the nonwoven fabric with the contact plane A non-woven fabric on which is formed.
The nonwoven fabric according to any one of claims 1 to 7, wherein the nonwoven fabric is disposed between the surface material and the absorbent body to form an absorbent article.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010288538A JP5674455B2 (en) | 2010-12-24 | 2010-12-24 | Non-woven |
| PCT/JP2011/079732 WO2012086730A1 (en) | 2010-12-24 | 2011-12-21 | Non-woven fabric, and absorbent article using same |
| MYPI2013701072A MY161013A (en) | 2010-12-24 | 2011-12-21 | Nonwoven fabric and absorbent article using the same |
| RU2016104532A RU2642033C1 (en) | 2010-12-24 | 2011-12-21 | Non-woven material and absorbing product using it |
| RU2013134458/12A RU2598303C2 (en) | 2010-12-24 | 2011-12-21 | Non-woven material and absorbent article using same |
| CN201180066033.0A CN103339309B (en) | 2010-12-24 | 2011-12-21 | The absorbent commodity of non-woven fabrics and this non-woven fabrics of use |
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| JP2010288538A JP5674455B2 (en) | 2010-12-24 | 2010-12-24 | Non-woven |
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| US10603229B2 (en) | 2017-02-13 | 2020-03-31 | The Procter & Gamble Company | Methods and tooling for making three-dimensional substrates for absorbent articles |
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| JP6480173B2 (en) * | 2014-12-16 | 2019-03-06 | 花王株式会社 | Disposable diapers |
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|---|---|---|---|---|
| JP2849204B2 (en) * | 1990-11-21 | 1999-01-20 | ユニ・チャーム株式会社 | Surface sheet for absorbent articles |
| JP3611745B2 (en) * | 1999-07-05 | 2005-01-19 | 花王株式会社 | Compression recovery sheet and absorbent article using the same |
| JP5112047B2 (en) * | 2007-12-28 | 2013-01-09 | 花王株式会社 | Absorbent article surface sheet |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10603229B2 (en) | 2017-02-13 | 2020-03-31 | The Procter & Gamble Company | Methods and tooling for making three-dimensional substrates for absorbent articles |
| US10966880B2 (en) | 2017-02-13 | 2021-04-06 | The Procter & Gamble Company | Methods and tooling for making three-dimensional substrates for absorbent articles |
| US11076998B2 (en) | 2017-02-13 | 2021-08-03 | The Procter & Gamble Company | Laminates for absorbent articles |
| US11083639B2 (en) | 2017-02-13 | 2021-08-10 | The Procter & Gamble Company | Methods of making laminates for absorbent articles |
| US11096838B2 (en) | 2017-02-13 | 2021-08-24 | The Procter & Gamble Company | Methods and tooling for forming performance zones in substrates |
| US11246768B2 (en) | 2017-02-13 | 2022-02-15 | The Procter & Gamble Company | Laminates for absorbent articles and methods of making the same |
| US11844670B2 (en) | 2017-02-13 | 2023-12-19 | The Procter And Gamble Company | Methods of making laminates for absorbent articles |
| US11376169B2 (en) | 2017-05-03 | 2022-07-05 | The Procter & Gamble Company | Absorbent article having multiple zones |
| US11273083B2 (en) | 2017-11-06 | 2022-03-15 | The Procter & Gamble Company | Structure having nodes and struts |
| US10918532B2 (en) | 2017-12-19 | 2021-02-16 | The Procter & Gamble Company | Methods of making elastic belts for absorbent articles |
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