JP2012144835A - Nonwoven fabric - Google Patents
Nonwoven fabric Download PDFInfo
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- JP2012144835A JP2012144835A JP2011271648A JP2011271648A JP2012144835A JP 2012144835 A JP2012144835 A JP 2012144835A JP 2011271648 A JP2011271648 A JP 2011271648A JP 2011271648 A JP2011271648 A JP 2011271648A JP 2012144835 A JP2012144835 A JP 2012144835A
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- nonwoven fabric
- protrusion
- fiber
- sheet
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- 239000000835 fiber Substances 0.000 claims abstract description 178
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Landscapes
- Nonwoven Fabrics (AREA)
Abstract
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ける不織布においては、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***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。 Non-woven fabrics in absorbent articles such as sanitary napkins, panty liners, disposable diapers, etc., depending on their functions, those provided with a protruding part on one side of the sheet material, or those provided with a protruding part A lot of 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、連続した不織布の作製を検討した。
上記の点に鑑み本願発明は、柔らかなクッション性を有し押圧したときの戻りが良く、***物の捕集性に優れ、特に液体の引き込み性の良い表面シートとして好適な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, production of a continuous nonwoven fabric having portions protruding on both the front and back surfaces as well as on one side of the sheet material was examined.
In view of the above points, the present invention has an object of providing a nonwoven fabric suitable as a top sheet having a soft cushioning property, good return when pressed, excellent excretion collection ability, and particularly good liquid drawability. And
シート状の不織布を平面視した側の第１面側に突出する第１突出部と、前記第１面とは反対側の第２面側に突出する第２突出部とを有し、前記第１突出部及び第２突出部は、前記不織布の平面視において第１方向と第２方向との２つの方向に向け複数交互に広がった不織布であって、前記第１突出部の頂部における第一面側の繊維密度（ｒ１１ａ）が、その第２面側の繊維密度（ｒ１１ｂ）より低い（ｒ１１ａ＜ｒ１１ｂ）不織布。 A first projecting portion projecting to the first surface side of the sheet-like nonwoven fabric in plan view, and a second projecting portion projecting to the second surface side opposite to the first surface; 1 protrusion part and 2nd protrusion part are the nonwoven fabrics which spread in multiple numbers toward two directions, a 1st direction and a 2nd direction, in the planar view of the said nonwoven fabric, Comprising: The 1st in the top part of the said 1st protrusion part A nonwoven fabric in which the fiber density (r 11a ) on the surface side is lower than the fiber density (r 11b ) on the second surface side (r 11a <r 11b ).
本発明の不織布は、柔らかなクッション性を有し押圧したときの戻りが良く、***物の捕集性に優れ、特に液体の引き込み性の良い表面シートとして好適に利用することができる。 The non-woven fabric of the present invention has a soft cushioning property and is easy to return when pressed, can be suitably used as a top sheet that excels in excretion collection, and has particularly good liquid draw-in properties.
図１は本発明のシート状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 top sheet of an absorbent article which is a preferred embodiment (Embodiment 1) of the sheet-like 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, although it explains considering the embodiment which uses the 1st surface side toward the wearer's skin surface as mentioned above of nonwoven fabric 10 shown in the above-mentioned drawing, the present invention is limited and interpreted by this Absent.
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とが好ましい。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１ｍｍ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。 It is preferable that the nonwoven fabric 10 of this embodiment has the structure continuous 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 distinguishing this, for example, a small hole can be defined as having a circle equivalent diameter of 1 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の平面視した側の第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。）。この格子状配列は、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 in plan view, a large number of first protrusions 1 are arranged extending in an oblique relationship in the plane in two vertical and horizontal directions (hereinafter referred to as this). The arrangement is sometimes called an oblique grid arrangement.) This lattice arrangement may be orthogonal (90 °), and in such a case, it 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。なお、本発明において尾根もしくは尾根状とは第１突出部の内部空間１ｋもしくは第２突出部の内部空間２ｋを谷としてみたときに、谷と谷との間の山地突起状部の連続した部分をいい、通常不織布シートの面方向とほぼ同一方向の面を有している。 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. In the present invention, the ridge or the ridge shape is a continuous portion of the mountainous protrusion-like portion between the valley when the internal space 1k of the first protrusion or the internal space 2k of the second protrusion is viewed as a valley. Usually, it has a surface in substantially the same direction as the surface direction of the nonwoven fabric sheet.
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
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い。
・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、そのどちらの面を肌面側にしても、表面シートが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。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、***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。
・***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、***液や***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***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***物がストックされる。一方、粘度が低く透過しやすい***液であれば、表面シートを透過したのち、内部空間１ｋに、あるいはその下方に下層シートがある場合にはその上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***液ないし***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***ののちにも、幅広く対応して極めて良好なサラッと感じが持続される。
Here, the operation based on the basic structure of the nonwoven fabric of the present embodiment described above will be described.
-Cushion property Since the nonwoven fabric of this embodiment has the part which protruded not only on one side of the front and back but on both surfaces, the cushion property peculiar to the structure is expressed. For example, streak-like projections or single-sided projections will inevitably exhibit elasticity as lines or surfaces. However, according to this embodiment, the two-dimensional movement is well followed and supported by points on both sides. Has a three-dimensional cushioning. 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 by pressing force due to the fiber orientation of the wall portion described above, the shape restoring force is large, and even if the packing state and wearing are continued, the initial cushioning force is not easily lost.
-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, whichever surface is the skin side, a good touch that the top sheet softly contacts the skin with respect to the skin is realized. 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 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, assuming that the first surface side z1 of the nonwoven fabric 10 in FIG. 1 is the skin surface side, if the excrement has high viscosity and low permeability, the inner space 2k does not pass through the top sheet. The excrement is temporarily stocked. On the other hand, if the excretory liquid has low viscosity and easily permeates, after passing through the top sheet, if there is a lower layer sheet in the internal space 1k or below it, it is collected on it. 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 can be sustained widely.
次に、本実施形態の不織布の特徴的な構造である、第１突出部１の頂部１１における第一面側ｚ１の繊維密度（ｒ１１ａ）が、その第２面側ｚ２の繊維密度（ｒ１１ｂ）より低い（ｒ１１ａ＜ｒ１１ｂ）構成に及びその作用について説明する。本発明において繊維密度の測定方法は特に断らない限り実施例において示した方法によるものである。繊維密度については、各部の符号を下付きの添え字として示し、「ｒ」の文字でその値が繊維密度を意味することとする。その他、繊維配向（ｑ）等についても上記と同様の規則で表示する。 Next, the fiber density (r 11a ) of the first surface side z 1 in the top portion 11 of the first protrusion 1, which is a characteristic structure of the nonwoven fabric of the present embodiment, is the fiber density of the second surface side z 2 . The structure (r 11a <r 11b ) lower than (r 11b ) and its operation will be described. In the present invention, the fiber density measurement method is based on the method shown in the examples unless otherwise specified. About fiber density, the code | symbol of each part is shown as a subscript, and let the value mean fiber density by the letter of "r". In addition, the fiber orientation (q) and the like are also displayed according to the same rules as described above.
本実施形態においては、上述のように第１突出部１の第１面側ｚ１の繊維密度（ｒ１１ａ）と第２面側ｚ２の繊維密度（ｒ１１ｂ）とが、ｒ１１ａ＜ｒ１１ｂの関係にあることにより、その部分での柔軟性と形状維持性とが両立されている。これらの作用はこの種の不織布において通常両立しにくいものであるが、上述のような特有の繊維の粗密を与えることにより、その部分において外部からの押圧に対する構造変形部分と構造維持部分とが形成され、上記の作用が得られる。たとえて言うとすれば、第１突出部の頂部１１において第２面側の繊維が「密」であるため、相対的に硬い部分がアーチ上になって橋脚の機能を果たし、その第１面側は柔らかく全体においては剛直にならずに十分な柔軟性が維持されているため、触れた際の肌触りが柔らかく感じられる。さらに、上述の繊維の粗密構造は粗である第1面側と密である第２面側で圧力に対する挙動が異なっており、繊維が第１突出部の形状に沿って密に積み重なっていると考えられる第２面側は、第１突出部全体の構造変形によるクッション性を有し、構造の素早い復元性に寄与する。一方で、繊維が第1突出部の曲面から広がる（起立する）網目構造を形成していると考えられる第1面側では、接触した部分及びその近傍が変形するクッション性を有し、緩やかな構造回復による柔軟性に寄与する。また、第１突出部の頂部１１において第２面側の繊維密度が第１面側の繊維密度より高いため、体液は速やかに第２面側に移動し、第１面側に接する肌がドライに保たれる。
第１突出部における繊維密度は上記効果を十分に発揮する観点から、ｒ１１ａは１５本／ｍｍ２〜１２０本／ｍｍ２が好ましく、２０本／ｍｍ２〜８０本／ｍｍ２がより好ましい。ｒ１１ｂは２０本／ｍｍ２〜１５０本／ｍｍ２が好ましく、３０本／ｍｍ２〜１２０本／ｍｍ２がより好ましい。ｒ１１ａ、ｒ１１ｂの比は特に限定されないが、ｒ１１ａ／ｒ１１ｂは、１．２以上５以下であることが好ましく、１．５以上４以下であることが特に好ましい。
In the present embodiment, as described above, the fiber density (r 11a ) of the first surface side z 1 of the first protrusion 1 and the fiber density (r 11b ) of the second surface side z 2 are r 11a <r By being in the relationship of 11b , the flexibility and shape maintainability at that portion are compatible. These effects are usually difficult to achieve in this type of nonwoven fabric. However, by providing the above-mentioned specific fiber density, a structure deformation portion and a structure maintenance portion with respect to external pressure are formed at that portion. Thus, the above-described action can be obtained. If it says, since the fiber of the 2nd surface side is "dense" in the top part 11 of a 1st protrusion part, a relatively hard part will become on an arch, and the function of a pier will be performed, The 1st surface Since the side is soft and does not become rigid as a whole, sufficient flexibility is maintained, so that it feels soft when touched. Further, the above-described fiber density structure is different in pressure behavior on the rough first surface side and the dense second surface side, and the fibers are densely stacked along the shape of the first protrusion. The conceivable second surface side has a cushioning property due to the structural deformation of the entire first protrusion, and contributes to a quick restoration of the structure. On the other hand, on the first surface side where the fibers are considered to form a network structure that spreads (stands up) from the curved surface of the first protrusion, the contacted portion and the vicinity thereof have a cushioning property that deforms and is gentle. Contributes to flexibility through structural recovery. In addition, since the fiber density on the second surface side is higher than the fiber density on the first surface side at the top portion 11 of the first protrusion, the body fluid quickly moves to the second surface side, and the skin in contact with the first surface side is dry. To be kept.
From the viewpoint fiber density in the first protruding portion to sufficiently exhibit the above effects, r 11a is preferably fifteen / mm 2 to 120 present / mm 2, 20 present / mm 2 to 80 present / mm 2 is more preferable. r 11b is preferably 20 pieces / mm 2 to 150 pieces / mm 2, and more preferably 30 pieces / mm 2 to 120 pieces / mm 2 . The ratio of r 11a and r 11b is not particularly limited, but r 11a / r 11b is preferably 1.2 or more and 5 or less, and particularly preferably 1.5 or more and 4 or less.
本実施形態の前記第１突出部頂部における前記両面側の繊維密度の差の絶対値（｜ｒ１１ａ−ｒ１１ｂ｜）は、前記第２突出部頂部における前記両面側の繊維密度の差の絶対値（｜ｒ2１ａ−ｒ2１ｂ｜）より大きくされている。また、同時に、前記第２突出部頂部の第１面側の繊維密度（ｒ２１ａ）と第２面側の繊維密度（ｒ２１ｂ）とは実質的に等しい状態にされている。
つまり、ｒ２１ａ=ｒ２１ｂ＞ｒ１１ｂ＞ｒ１１ａになる。これにより、第１突出部の第１面側に排出された体液は、第１突出部の第２面側に移動し、さらに第２突出部に液が移動するため、第１面側に接する肌がさらにドライに保たれるだけではなく、着座により荷重がかかった際にも液戻りしにくい。
第２突出部における繊維密度（ｒ２１ａおよびｒ２１ｂ)は上記効果を十分に発揮する観点から、３０本／ｍｍ２〜５００本／ｍｍ２が好ましく、５０本／ｍｍ２〜２００本／ｍｍ２がより好ましい。また、ｒ２１ａおよびｒ２１ｂの繊維密度が実質的に等しいとは機能上有意な差が生じない程度であればよく、例えば｜ｒ２１ａ−ｒ２１ｂ｜が１０本／ｍｍ２以下となる程度のものをいう。
The absolute value (| r 11a −r 11b |) of the difference in fiber density on the both sides at the top of the first protrusion of the present embodiment is the absolute value of the difference in fiber density on the sides of the second protrusion at the top of the second protrusion. It is larger than the value (| r 21a -r 21b |). Also it has been simultaneously in substantially equal state and fiber density of the first surface of the second protrusion apex (r 21a) and the second surface side of the fiber density (r 21b).
That is, r 21a = r 21b > r 11b > r 11a . Thereby, the bodily fluid discharged to the first surface side of the first projecting portion moves to the second surface side of the first projecting portion, and further moves to the second projecting portion, so that the body fluid contacts the first surface side. Not only will the skin be kept more dry, but it will also be less likely to return to liquid when seated.
From the viewpoint fiber density of the second protrusion (r 21a and r 21b) is to sufficiently exhibit the above effect, preferably 30 present / mm 2 to 500 present / mm 2, 50 present / mm 2 to 200 DEG present / mm 2 Is more preferable. In addition, it is sufficient that the fiber densities of r 21a and r 21b are substantially equal as long as no significant functional difference occurs, for example, | r 21a −r 21b | is 10 fibers / mm 2 or less. Say things.
ここで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５〜７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直交する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とが重なる状態とされている。 Here, the more detailed features of the nonwoven fabric of this embodiment including the fiber orientation will be described based on FIGS. The nonwoven fabric of this embodiment has the 1st protrusion part 1 and the 2nd protrusion part 2, 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 projecting portions of each row are projected in a direction orthogonal to each row within the sheet surface, the first projecting portion and the second projecting portion overlap in adjacent rows. 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.
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５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（連結部）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。なお、本発明において「環状」とは平面視において無端の一連の形状をなしていれば特に限定されず、平面視において円、楕円、矩形、多角形など、どのような形状であってもよい。シートの連続状態を好適に維持する上では円又は楕円が好ましい。さらに、「環状」を立体形状としていえば、円柱状、斜円柱状、楕円柱状、切頭円錐状、切頭斜円錐状、切頭楕円錐状、切頭四角錐状、切頭斜四角錐状など任意の環構造が挙げられ、連続したシート状態を実現する上では、円柱状、楕円柱状、切頭円錐状、切頭楕円錐状が好ましい。 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. 5, 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 that is the back of the horse between the first protrusions adjacent on the first surface side of the wall portions 31 ′, 32 ′, 33 ′, and 34 ′. ) 6 and ridge portions 61 to 64 are formed corresponding to the wall portions 31 ′ to 34 ′, respectively. In the present invention, “annular” is not particularly limited as long as it has an endless series of shapes in plan view, and may be any shape such as a circle, an ellipse, a rectangle, or a polygon in plan view. . A circle or an ellipse is preferable for maintaining the continuous state of the sheet suitably. Furthermore, if the "annular" is considered as a three-dimensional shape, a cylindrical shape, an oblique cylindrical shape, an elliptical columnar shape, a truncated cone shape, a truncated oblique cone shape, a truncated elliptical cone shape, a truncated rectangular pyramid shape, a truncated oblique pyramid shape Arbitrary ring structures, such as a shape, are mentioned, In order to implement | achieve a continuous sheet | seat state, cylindrical shape, elliptic cylinder shape, truncated cone shape, and truncated elliptical cone shape are preferable.
図６（ａ）は図５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ｇ１ａ、ｇ１ｂ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３１〜３４の符号を加入して示している。図６（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。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。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る。
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る場合、くぼみを与えるときにはすでに繊維同士が融着しているため、繊維の配向性に変化が生じず、通常図６（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、融着された時のシートの繊維配向性が残り、その分割位置ごとに繊維配向性が異なることとなる。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。
つまり、通常不織布を製造するときに、そのＭＤ方向に繊維が配向しそのまま融着されるため、ＭＤ方向断面における壁部の繊維はその起立方向に繊維が配向するものの、ＣＤ方向断面においては、起立方向とは直行する方向に繊維が配向することとなる。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。
FIG. 6A shows a rectangular model obtained by developing the wall 3 shown in FIG. 5, and the lines g 1a and g 1b shown therein indicate the fiber orientation directions. In order to indicate the position of the wall portion, reference numerals 31 to 34 are further added. As shown in FIG. 6A, the wall 3 of the present embodiment is oriented in the standing direction of the wall at any location. 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. As described above, the cushioning characteristic peculiar to the present embodiment is thereby produced.
On the other hand, for example, when giving a dent by embossing etc. to the nonwoven fabric which has been fused and given a predetermined orientation before shaping the fiber web, the fibers are already fused together when the dent is given. When the annular wall portion is divided every 90 ° in plan view as shown in FIG. 6 (b), the fiber orientation of the sheet at the time of fusion remains, The fiber orientation is different for each division 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.
That is, when the nonwoven fabric is usually produced, the fibers are oriented in the MD direction and fused as they are, so the fibers in the wall in the MD direction cross section are oriented in the standing direction, but in the CD direction cross section, The standing direction means that the fibers are oriented in a direction perpendicular to the standing direction. “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”.
図７は図５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に放射状の繊維配向性があることで、突出部の厚み方向の耐加重が強くなり、クッション性や保形性が高まり、着座により荷重がかかった際にも液戻りしにくい。また、加重解放後の復元性も高くなるという作用を奏する。 FIG. 7 schematically shows the fiber orientation direction (line g 3 ) in a state where one second protruding portion 2 shown in FIG. 5 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, when the second protrusion top 21 has radial fiber orientation, the load resistance in the thickness direction of the protrusion is increased, cushioning and shape retention are increased, and when a load is applied by seating. Is difficult to return. In addition, there is an effect that the restoration property after the weighted release is also improved.
前記第１突出部頂部１１の繊維配向性（ｑ１１）と前記第２突出部頂部の繊維配向性（ｑ２１）とは異なっている。本発明において繊維配向性の測定方法は特に断らない限り実施例において示した方法によるものである。ここで、繊維配向性の意味について触れておくと、これは繊維の配向角と配向強度とからなる概念である。繊維の配向角は、色々な方向性を有する複数の繊維が全体としてどの方向に配向しているかを示す概念で、繊維の集合体の形状を数値化している。繊維の配向強度は、配向角を示す繊維の量を示す概念であり、配向強度は、１．１未満では、ほとんど配向しておらず、１．１以上で配向を有しているといえる。しかしながら、本実施形態においては、繊維の配向がその部位によって変化している。すなわち、ある配向角の状態の部位から異なる配向角の部位へと変化する間（繊維がある方向に配向強度が強い状態から異なる配向に強い強度を示す部位へ変化する間）に、配向強度が弱い状態や再配向することで高い状態へ至る状態等の様々な状態を有する。そのため、ある強い配向角を示す部位と別の方向に強い配向角を示す部位との間においては、繊維の配向強度が弱くとも繊維の配向角が変わっていることが好ましく、配向強度が高いことがより好ましい。配向強度について本実施形態において一例を示すと、第１突出部頂部１１は、第１突出部１の曲面構造に対して５０〜１３０°の配向角、より好ましくは６０〜１２０°で、配向強度（Ｘ１１）は１．０５以上、より好ましくは１．１５以上である。一方、第２突出部では前記の通り頂部２１に向かって収束するように繊維が配向しているため、繊維の配向角度は第２突出部２の曲面構造に対して０〜４０°又は１４０°〜１８０°の配向角、より好ましくは０〜３０°又は１５０°〜１８０°の配向角で、頂部の配向強度（Ｘ２１）は１．０５以上、より好ましくは１．１５以上である。各々の頂部の繊維の配向性に違いがあることで、圧縮挙動に対する違いが生じ、第１突出部の頂部は接触した部分及びその近傍が変形することによるクッション性を発現し、第２突出部は突出部全体が撓むような構造変形を起こし易いが、第２突出部が上記頂部に収束する繊維構造であることから、上面から見た際の特定方向への変形に対しては異なる部位の異なる方向への変形をともなうため、変形に対する抑制と変形後の戻り易さが得られるという作用を奏する。
なお、本発明においては、特に断らない限りシート厚み方向に沿う方向を配向角度９０°とし、図２で示した状態ではｚ方向がこれにあたる。
The fiber orientation (q 11 ) of the first protrusion top 11 is different from the fiber orientation (q 21 ) of the second protrusion top 11 . In the present invention, the fiber orientation measurement method is based on the method shown in the examples unless otherwise specified. Here, if the meaning of fiber orientation is mentioned, this is the concept which consists of the orientation angle and orientation strength of a fiber. The fiber orientation angle is a concept that indicates in which direction a plurality of fibers having various directions are oriented as a whole, and the shape of the fiber aggregate is quantified. The orientation strength of the fiber is a concept indicating the amount of fibers exhibiting the orientation angle. The orientation strength is less than 1.1 and hardly oriented, and it can be said that the orientation is 1.1 or more. However, in this embodiment, the fiber orientation changes depending on the part. That is, the orientation strength is changed during the transition from a part having a certain orientation angle to a part having a different orientation angle (while the fiber is changing from a state in which the orientation strength is strong in one direction to a part having a strong strength in a different orientation). It has various states such as a weak state and a state where a high state is reached by reorientation. Therefore, it is preferable that the orientation angle of the fiber is changed between the part showing a strong orientation angle and the part showing a strong orientation angle in another direction even if the orientation strength of the fiber is weak, and the orientation strength is high. Is more preferable. When an example is shown in this embodiment about orientation strength, the 1st protrusion part top part 11 is an orientation angle of 50-130 degrees with respect to the curved-surface structure of the 1st protrusion part 1, More preferably, it is 60-120 degrees. (X 11 ) is 1.05 or more, more preferably 1.15 or more. On the other hand, since the fibers are oriented so that they converge toward the top portion 21 as described above, the orientation angle of the fibers is 0 to 40 ° or 140 ° with respect to the curved surface structure of the second projection 2. With an orientation angle of ˜180 °, more preferably an orientation angle of 0-30 ° or 150 ° -180 °, the orientation strength (X 21 ) at the top is 1.05 or more, more preferably 1.15 or more. Due to the difference in the orientation of the fibers at the tops, there is a difference in compression behavior. The top of the first protrusion expresses cushioning properties due to deformation of the contacted part and the vicinity thereof, and the second protrusion. Tends to cause structural deformation that causes the entire protruding portion to bend, but since the second protruding portion is a fiber structure that converges to the top portion, different parts of the protrusion are deformed in a specific direction when viewed from above. Since it is accompanied by deformation in different directions, there is an effect that suppression against deformation and ease of return after deformation are obtained.
In the present invention, unless otherwise specified, the direction along the sheet thickness direction is an orientation angle of 90 °, and the z direction corresponds to this in the state shown in FIG.
本実施形態の不織布１０においては、前記第２突出部頂部２１の繊維配向性について、第１面側における繊維配向性（ｑ２１ａ）と第２面側における繊維配向性（ｑ２１ｂ）とが実質的に等しくなるようにされている。これにより、第２突出部は、均質な構造なため、上述したように保形性及び形状復元性が高く、また、全体に頂点に向かった配向のため体液が移動しやすい。なお、本明細書において、配向性が実質的に等しいとは、配向角度が９０°を超える場合には、を０〜９０°に変換（１８０°からの立ち上がり角度）した場合の角度差が２０°以下、より好ましくは１０°以下であり、配向強度の差が、０．５以下、より好ましくは０．３以下であることを言う。ｑ２１ａとｑ２１ｂとの配向強度の範囲は、特に限定されないが、１．０５以上が好ましく、１．１５以上であることが第２突出部による保形性と形状復元性の点から好ましい。 In the nonwoven fabric 10 of the present embodiment, the on fiber orientation of the second protrusion apex 21, the fiber orientation in the first surface side (q 21a) and fiber orientation in the second surface side (q 21b) and is substantially Are made equal. Thereby, since the 2nd protrusion part is a homogeneous structure, as above-mentioned, shape retention property and shape restoration property are high, and a bodily fluid moves easily because of the orientation toward the top as a whole. In the present specification, the orientation is substantially equal means that when the orientation angle exceeds 90 °, the angle difference when 20 is converted to 0 to 90 ° (rise angle from 180 °) is 20 °. It means that it is at most 0 °, more preferably at most 10 °, and the difference in orientation strength is at most 0.5, more preferably at most 0.3. The range of the orientation strength between q 21a and q 21b is not particularly limited, but is preferably 1.05 or more, and more preferably 1.15 or more from the viewpoint of shape retention and shape restoration by the second protrusion.
本実施形態においては、前記第１突出部の繊維量（ｕ１）と前記第２突出部の繊維量（ｕ２）とが実質的に等しいものとされている。本発明において繊維量の測定方法は特に断らない限り下記に示した方法によるものである。これにより、圧力等による変形時に座屈しにくくなり、圧力開放時の形状復元が起こりやすく好ましい。また、不織布における上記繊維量が略等しいことによって、不織布の強度等の物性値が安定し、繊維ムラによる感触の変化や破れが起こりにくく好ましい。
繊維量が実質的に等しいとは機能上有意な差が生じない程度であればよい。なお、繊維量とは坪量ないし目付けと同義であり、特に断らない限り、下記の方法で測定した方法による。
＜繊維量の測定＞
・キーエンス製デジタルマイクロスコープＶＨＸ−１０００で測定する部位が十分に視野に入り測定できる大きさ（１０〜１００倍）に拡大し、第１突出部、及び第２突出部の厚み（ｍｍ）を測定する。測定は、５回行い、その平均をそのサンプルの厚み（ｍｍ）とする。
・後述する繊維密度の測定方法により、１ｍｍ２当たりの繊維本数を計測する。
・繊維量は、厚み（ｍｍ）×１ｍｍ２当たりの繊維本数（本）を計測することで評価した。つまり、第１突出部、及び第２突出部の厚み×１ｍｍ２当たりの繊維本数がほぼ等しければ、繊維量も等しいと判断した。ほぼ等しいとは、測定誤差範囲の違いを含む意味である。
後述するように、第１突出部の厚みは、第２突出部より厚いため、繊維疎度に差を生じさせることができ、両者の間で繊維間の粗密勾配が生じ、体液が吸収体へ移動しやすくなり好ましい。
In the present embodiment, the fiber amount (u 1 ) of the first protrusion and the fiber amount (u 2 ) of the second protrusion are substantially equal. In the present invention, the method for measuring the amount of fiber is as follows unless otherwise specified. Thereby, it becomes difficult to buckle at the time of deformation due to pressure or the like, and it is preferable that the shape is restored when the pressure is released. In addition, it is preferable that the amount of fibers in the nonwoven fabric is substantially equal, so that the physical property values such as strength of the nonwoven fabric are stabilized, and a change in feel and tear due to fiber unevenness hardly occur.
The fiber amount is substantially equal as long as it does not cause a significant difference in function. The fiber amount is synonymous with basis weight or basis weight, and unless otherwise specified, is based on the method measured by the following method.
<Measurement of fiber amount>
・ Measures the thickness (mm) of the first and second protrusions by enlarging the area measured with the KEYENCE digital microscope VHX-1000 enough to enter the field of view (10 to 100 times). To do. The measurement is performed 5 times, and the average is taken as the thickness (mm) of the sample.
-The fiber number per 1 mm < 2 > is measured with the measuring method of the fiber density mentioned later.
- fiber amount was evaluated by measuring the thickness (mm) × 1 mm 2 per number of fibers (present). That is, if the number of fibers per thickness x 1 mm 2 of the first protrusion and the second protrusion is substantially equal, it was determined that the amount of fibers was also equal. The term “substantially equal” includes a difference in measurement error range.
As will be described later, since the thickness of the first protrusion is thicker than that of the second protrusion, it is possible to cause a difference in fiber density, and a density gradient between the fibers is generated between the two, and body fluid is transferred to the absorber. It is easy to move and is preferable.
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、１ｍｍ〜７ｍｍが好ましく、１．５ｍｍ〜５ｍｍがより好ましい。その範囲とすることにより、使用時の体液吸収速度が速く、吸収体からの液戻りを抑え、さらには、適度なクッション性を実現することができる。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〜３ｍｍであることが好ましく、０．４ｍｍ〜２ｍｍ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。各層厚み（Ｓ１）、（Ｓ２）、（Ｓ３）の関係は、Ｓ１＞Ｓ３＞Ｓ２であることが好ましい。これにより、第１突出部において、特に肌面側では、繊維粗度が高く（疎）、良好な肌当たりを実現することができる。一方、壁部、第２突出部、及び、壁部は繊維粗度が低く（密）なり、潰れにくく、型崩れせずに良好なクッション性と体液の吸収速度に優れた不織布とすることができる。
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 mm to 7 mm is preferable, and 1.5 mm to 5 mm is more preferable. By setting it as the range, the body fluid absorption speed at the time of use is high, the liquid return from an absorber is suppressed, and also moderate cushioning property is realizable. 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 for diapers, sanitary products, etc., the layer thickness (S 1 ) of the top of the first protrusion is preferably 0.1 mm to 3 mm, and more preferably 0.4 mm to 2 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. The relationship among the layer thicknesses (S 1 ), (S 2 ), and (S 3 ) is preferably S 1 > S 3 > S 2 . Thereby, in the 1st protrusion part, especially on the skin surface side, fiber roughness is high (sparse) and it can implement | achieve favorable skin contact. On the other hand, the wall portion, the second projecting portion, and the wall portion have a low fiber roughness (dense), are not easily crushed, and are made of a nonwoven fabric excellent in cushioning properties and absorption speed of body fluids without being out of shape. it can.
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〜１０ｍｍが好ましく、２ｍｍ〜５ｍｍ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. 10 mm is preferable and 2 mm-5 mm are more preferable.
本実施形態の不織布のもつ坪量は特に限定されないが、シート全体の平均値でいうと、１５〜５０ｇ／ｍ２であることが好ましく、２０〜４０ｇ／ｍ２であることがより好ましい。 Basis weight with the nonwoven fabric of the present embodiment is not particularly limited, in terms of the average value of the entire sheet is preferably 15 to 50 g / m 2, and more preferably 20 to 40 g / m 2.
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、まず温風の空気を供給して、多数の突起９（図２ウェブ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。このときの温風の温度は、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、繊維ウェブを構成する熱可塑性繊維の融点に対して０〜７０℃低いことが好ましく、５〜５０℃低いことがより好ましい。次いでウェブ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、繊維ウェブを構成する熱可塑性繊維の融点に対して０〜７０℃高いことが好ましく、５〜５０℃高いことがより好ましい。熱可塑性繊維としては、例えば、ポリプロピレン、ポリエチレン等のポリオレフィン系、ポリエステル系、ナイロン６、ナイロン６６等のポリアミド系、ポリアクリルニトリル系等、またはこれら２種類以上からなる芯鞘型、サイドバイサイド型の複合繊維等を挙げることができる。熱可塑性繊維として、低融点成分及び高融点成分を含む複合繊維を用いる場合、繊維ウェブに吹き付ける熱風の温度は、低融点成分の融点以上で、かつ高融点成分の融点未満であることが好ましい。繊維ウェブに吹き付ける熱風の温度は、低融点成分の融点＋０℃〜高融点成分の融点−１０℃であることがより好ましく、低融点成分の融点＋５℃〜高融点成分の融点−２０℃であることが更に好ましい。繊維ウェブ及び不織布は、熱可塑性繊維を、３０〜１００質量％含んでいることが好ましく、より好ましくは４０〜８０質量％である。繊維ウェブ及び不織布は、本来的に熱融着性を有さない繊維（例えばコットンやパルプ等の天然繊維、レーヨンやアセテート繊維など）を含んでいてもよい。
繊維ウェブを賦形する際、温風の風速は、賦形性と風合いの観点から２０〜１５０ｍ／秒とすることがより好ましく、より好ましくは３０〜１００ｍ／秒である。風速がこの下限値以上であると立体感が十分となり、クッション性と***物の捕集性の効果が十分に発揮され好ましい。また、繊維密度や配向が所定の範囲となり、体液の吸収速度が速くなり、液戻り量が少なくなるので好ましい。風速がこの上限値以下であるとシートが開孔せず、耐圧縮性が良好に維持されるため、クッション性と***物の捕集性の効果が十分に発揮でき、肌触りがよく、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またはドラム式のものとし、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。
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 device, first, warm air is supplied to fix the fiber web on a large number of protrusions 9 (a pedestal (not shown) having a web and having air permeability in FIG. 2). The temperature of the hot air is preferably 0 to 70 ° C. lower than the melting point of the thermoplastic fiber constituting the fiber web, and 5 to 50 ° C. lower than the melting point of the thermoplastic fiber constituting the fiber web in consideration of a general fiber material used for this type of product. Next, hot air h (see FIG. 2) is blown onto the fiber web on the pedestal of the web at a temperature at which each fiber can be appropriately fused, and the fiber web is shaped along the protrusions 9 on the pedestal. At this time, the temperature of the hot air is 0 to 70 with respect to the melting point of the thermoplastic fiber constituting the fiber web in consideration of a general fiber material used in this type of product. ℃ high is preferable, 5-50 ℃ high The thermoplastic fiber is preferably a polyolefin type such as polypropylene or polyethylene, a polyester type, a polyamide type such as nylon 6 or nylon 66, a polyacrylonitrile type, or a core-sheath type comprising two or more of these. , Side-by-side type composite fiber, etc. When the composite fiber containing the low melting point component and the high melting point component is used as the thermoplastic fiber, the temperature of the hot air blown onto the fiber web is equal to or higher than the melting point of the low melting point component, The temperature of the hot air blown to the fiber web is more preferably the melting point of the low melting point component + 0 ° C. to the melting point of the high melting point component−10 ° C., and the melting point of the low melting point component. It is more preferable that the melting point of the high melting point component is + 5 ° C. to −20 ° C. The fiber web and the nonwoven fabric are heatable. It is preferable to contain 30 to 100% by mass of a soluble fiber, and more preferably 40 to 80% by mass.The fiber web and the non-woven fabric are fibers that are not inherently heat-fusible (for example, cotton or pulp). Natural fibers such as rayon and acetate fibers).
When shaping the fiber web, the wind speed of the warm air is more preferably 20 to 150 m / sec, more preferably 30 to 100 m / sec, from the viewpoints of formability and texture. When the wind speed is equal to or higher than this lower limit, the three-dimensional effect is sufficient, and the effects of cushioning and excrement collection are sufficiently exhibited. Further, it is preferable because the fiber density and orientation are in a predetermined range, the body fluid absorption rate is increased, and the liquid return amount is reduced. When the wind speed is less than or equal to this upper limit value, the sheet does not open and the compression resistance is maintained well, so that the cushioning effect and excrement collecting effect can be sufficiently exhibited, and the touch is good and preferable. In consideration of continuous production, there is a mode in which the pedestal is a conveyor type or drum type that can be conveyed, and the typed nonwoven fabric that is 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.
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表面シートとして好適に使用することができる。その他、前記用サブレイヤ（セカンドシート 一般的な表記で）、おしり拭きシート、おそうじシート、フィルター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 surface sheet of absorbent articles such as disposable diapers, sanitary napkins, panty liners, urine absorption pads and the like. In addition, the form used as a sublayer for the above (second sheet in general notation), a wiping wiping sheet, a cleaning sheet, and a filter is also included.
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）
（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２．４ｄｔｅｘ×５１ｍｍの芯鞘型複合繊維を坪量３０ｇ／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、温度１３０℃、風速４７．５ｍ／秒の温風を供給して、多数の突起を有し通気性を有する台座（ＭＤ方向ピッチ８ｍｍ、ＣＤ方向ピッチ５ｍｍ）の上に上記繊維ウェブを定着させた。次いで、その台座上の繊維ウェブに熱風（温度１４５℃、風速５ｍ／ｓ）を吹きつけて、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、各芯鞘構造の繊維を融着させた。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。不織布試験体１の断面をキーエンス製デジタルマイクロスコープＶＨＸ−１０００により２０倍で撮像した図面代用写真を図８に載せる。同写真中、上方が第１突出部側であり、下方が第２突出部側となる。
（２）おむつの作製
花王株式会社の市販のベビー用おむつ（商品名「メリーズさらさらエアスルーＭサイズ」）から表面シートを取り除き、その代わりに、不織布試験体１を第１突起側を肌面として積層し、その周囲を固定して評価用のベビー用おむつを得た。
Example 1
(1) A 2.4 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 as to have a basis weight of 30 g / m 2 . In the web shaping device, warm air at a temperature of 130 ° C. and a wind speed of 47.5 m / sec is supplied, and the above-mentioned on a pedestal (MD pitch 8 mm, CD pitch 5 mm) having a large number of protrusions and air permeability. The fiber web was fixed. Next, hot air (temperature: 145 ° C., wind speed: 5 m / s) is blown onto the fiber web on the pedestal to shape the fiber web along the protrusions on the pedestal, and the fibers of each core-sheath structure are fused. I let you. The nonwoven fabric shaped by heat sealing in this manner was taken out and used as a nonwoven fabric test body 1. FIG. 8 is a drawing-substituting photograph in which a cross section of the nonwoven fabric test body 1 is imaged 20 times with a Keyence digital microscope VHX-1000. In the photograph, the upper side is the first protrusion side, and the lower side is the second protrusion side.
(2) Preparation of diapers The surface sheet is removed from a commercially available baby diaper (trade name "Merry's Sarah Air-through M size") manufactured by Kao Corporation. Instead, the nonwoven fabric test specimen 1 is laminated with the first protrusion side as the skin surface. And the periphery was fixed and the baby diaper for evaluation was obtained.
（実施例２）
熱風の条件を温度１３０℃、風速５０ｍ／秒にした以外は、実施例１と同様にして、不織布試験体２とした。おむつは、実施例の不織布試験体1の代わりに不織布試験体２を用いて作製した。
(Example 2)
A non-woven fabric test body 2 was prepared in the same manner as in Example 1 except that the hot air was changed to a temperature of 130 ° C. and a wind speed of 50 m / sec. The diaper was produced using the nonwoven fabric specimen 2 instead of the nonwoven fabric specimen 1 of the example.
（実施例３）
熱風の条件を温度１３０℃、風速５２．５ｍ／秒にした以外は、実施例１と同様にして、不織布試験体３とした。おむつは、実施例の不織布試験体1の代わりに不織布試験体３を用いて作製した。
(Example 3)
A non-woven fabric specimen 3 was prepared in the same manner as in Example 1 except that the hot air conditions were a temperature of 130 ° C. and a wind speed of 52.5 m / sec. The diaper was produced using the nonwoven fabric specimen 3 instead of the nonwoven fabric specimen 1 of the example.
（実施例４）
熱風の条件を温度１２５℃、風速５０ｍ／秒にした以外は、実施例１と同様にして、不織布試験体４とした。おむつは、実施例の不織布試験体1の代わりに不織布試験体４を用いて作製した。
Example 4
A non-woven fabric test specimen 4 was prepared in the same manner as in Example 1 except that the hot air conditions were a temperature of 125 ° C. and a wind speed of 50 m / sec. The diaper was produced using the nonwoven fabric specimen 4 instead of the nonwoven fabric specimen 1 of the example.
（実施例５）
熱風の条件を温度１３５℃、風速５０ｍ／秒にした以外は、実施例１と同様にして、不織布試験体５とした。おむつは、実施例の不織布試験体1の代わりに不織布試験体５を用いて作製した。
(Example 5)
A non-woven fabric specimen 5 was prepared in the same manner as in Example 1 except that the hot air was set to a temperature of 135 ° C. and a wind speed of 50 m / sec. The diaper was produced using the nonwoven fabric specimen 5 instead of the nonwoven fabric specimen 1 of the example.
（比較例１）
特開２００８−２５０８１号公報の実施例１と同様にして、積層された筋状突出部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。
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を使用した。他方、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、目付は１５ｇ／ｍ２に調整された。
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目付は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、上記のようにして積層した繊維を搬送しながら、これに上記装置の噴き出し部から温度１０５℃、風量１２００ｌ／ｍｉｎの条件で熱風を吹きあてて不織布試験体ｃ１を作製した。
(Comparative Example 1)
In the same manner as in Example 1 of Japanese Patent Application Laid-Open No. 2008-25081, a non-woven fabric having laminated streak protrusions was produced. Specifically, it is as follows.
As the first fiber layer, a fiber A having a core-sheath structure of low density polyethylene (melting point 110 ° C.) and polyethylene terephthalate, having an average fineness of 3.3 dtex, an average fiber length of 51 mm, and a hydrophilic oil agent was used. On the other hand, a fiber layer in which high-density polyethylene (melting point: 135 ° C.) and polyethylene terephthalate core-sheath structure with 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 FIGS. 8 and 9 of JP-A-2008-25081, while transporting the fibers laminated as described above, a temperature of 105 ° C. is supplied from the ejection portion of the device to this. The nonwoven fabric test body c1 was produced 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、不織布を作製した。まず、ポリエチレンテレフタレート−ポリエチレンの芯鞘繊維２．４ｄｔｅｘ×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)
A nonwoven fabric was produced in the same manner as in Example 1 of JP-A-03-137258. First, a web composed of polyethylene terephthalate-polyethylene core-sheath fiber 2.4 dtex × 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.
（比較例３）
不織布試験体ｃ３は、特開平０８−２４６３２１号公報の実施例１に記載の方法によりピンロールを１２０℃に加熱し、坪量２５ｇ／ｃｍ２に調整して作製した不織布であり、独立凹部を有し、開孔を有する不織布である。おむつは、実施例の不織布試験体1の代わりに不織布試験体ｃ３を用いて作製した。
(Comparative Example 3)
Nonwoven fabric test body c3 is a nonwoven fabric produced by heating a pin roll to 120 ° C. and adjusting the basis weight to 25 g / cm 2 by the method described in Example 1 of JP-A-08-246321, and has an independent recess. And a non-woven fabric having openings. The diaper was produced using the nonwoven fabric specimen c3 instead of the nonwoven fabric specimen 1 of the example.
上記の不織布試験体を用い、下記の測定試験を行った。
＜シート厚さの測定＞
ＫＥＳ圧縮試験機（カトーテック（株）製ＫＥＳ ＦＢ−３）を用い、不織布について、通常モードで５．０×１０３Ｐａまでの圧縮特性評価を行い、微小加圧時（０．０５×１０３Ｐａ）の厚み（Ｔ）をチャートから読み取った。
＜繊維密度の測定＞
不織布部分の切断面を、走査電子顕微鏡を用いて拡大観察（繊維断面が３０〜６０本程度計測できる倍率に調整；１５０〜５００倍）し、一定面積当たり（０．５ｍｍ２程度）の前記切断面によって切断されている繊維の断面数を数えた。また、観察の中心は、第１突起及び第２突起部頂部において、図２に示した１１及び１２の中点を中心とした。次に１ｍｍ２当たりの繊維の断面数に換算し、これを繊維密度とした。測定は３ヶ所行い、平均してそのサンプルの繊維密度とした。
・走査電子顕微鏡；日本電子（株）社製のＪＣＭ−５１００（商品名）
The following measurement test was performed using the above-mentioned nonwoven fabric test body.
<Measurement of sheet thickness>
Using a KES compression tester (Kato Tech Co., Ltd., KES FB-3), the nonwoven fabric was subjected to a compression property evaluation up to 5.0 × 10 3 Pa in a normal mode, and at a minute pressure (0.05 × 10). The thickness (T) of 3 Pa) was read from the chart.
<Measurement of fiber density>
The cut surface of the nonwoven fabric portion is magnified using a scanning electron microscope (adjusted to a magnification capable of measuring about 30 to 60 fiber cross sections; 150 to 500 times), and the cut per fixed area (about 0.5 mm 2 ). The number of cross-sections of the fibers cut by the face was counted. The center of observation was centered on the midpoints 11 and 12 shown in FIG. 2 at the tops of the first and second protrusions. Next, it was converted into the number of cross-sections of fibers per 1 mm 2 and this was defined as the fiber density. The measurement was performed at three locations, and the fiber density of the sample was averaged.
Scanning electron microscope: JCM-5100 (trade name) manufactured by JEOL Ltd.
＜繊維配向性の測定＞
日本電子（株）社製の走査電子顕微鏡ＪＣＭ−５１００（商品名）を使用し、サンプルの測定する面に対して垂直の方向から撮影した画像（測定する繊維が３０〜６０本程度計測できる倍率に調整；５０〜３００倍）を印刷し、ＯＨＰシート上に繊維をなぞった。前記ＯＨＰシートをパソコン内に取り込み、株式会社ネクサス社製のｎｅｘｕｓＮｅｗＱｕｂｅ［商品名］（スタンドアロン版）画像処理ソフトウエアを使用して解析し、繊維画像を二値化した。前記二値化した画像を、Ｆｉｂｅｒ Ｏｒｉｅｎｔａｔｉｏｎ Ａｎａｌｙｓｉｓ ８．１３ Ｓｉｎｇｌｅソフト（商品名）を用い、フーリエ変換し、パワースペクトルを得、楕円近似した分布図から、配向角と配向強度を得た。配向角は繊維が最も配向している角度を示し、配向強度はその配向角における強度を示している。配向強度の値が大きいほど繊維の向きがそろっていることを示す。
なお、配向性ｑ１１における配向角度と配向強度は、第１突出部頂部１１の厚み方向略中央部の繊維状態を測定した結果である。
＜吸収時間の測定＞
花王株式会社の市販のベビー用おむつ（商品名「メリーズさらさらエアスルーＭサイズ」）から表面シートを取り除き、その代わりに、１００×２５０ｍｍに切り出した不織布試験体を積層し、その周囲を固定して評価用のベビー用おむつを得た。上記不織布試験体上に２０ｇ／ｃｍ２の荷重を均等にかけ、試験体のほぼ中央に設置した断面積１０００ｍｍ２の筒を当て、そこから人口尿を注入した。人工尿としては生理食塩水を用い、１０分ごとに４０ｇずつ３回にわたり人工尿を注入し、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。
＜液戻り量の測定＞
花王株式会社の市販のベビー用おむつ（商品名「メリーズさらさらエアスルーＭサイズ」）から表面シートを取り除き、その代わりに、１００×２５０ｍｍに切り出した不織布試験体１を積層し、その周囲を固定して評価用のベビー用おむつを得た。上記不織布試験体上に２０ｇ／ｃｍ２の荷重を均等にかけ、試験体のほぼ中央に設置した断面積１０００ｍｍ２の筒を当て、そこから人口尿を注入した。人工尿としては生理食塩水を用い、１０分ごとに４０ｇずつ３回にわたり人工尿を注入した後、前記２０ｇ／ｃｍ２の荷重を取り除き、不織布試験体上に、４．９ｋＰａの荷重をかけた濾紙を載置し２分放置した後、濾紙の重量変化を液戻り量（ｇ）とした。各試料の測定結果を下表１に示した。
<Measurement of fiber orientation>
Using a scanning electron microscope JCM-5100 (trade name) manufactured by JEOL Ltd., an image taken from a direction perpendicular to the surface to be measured of the sample (magnification that can measure about 30 to 60 fibers to be measured) (50 to 300 times) was printed, and the fibers were traced on the OHP sheet. The OHP sheet was taken into a personal computer and analyzed using a NexusNewQube [trade name] (stand-alone version) image processing software manufactured by Nexus Corporation to binarize the fiber image. The binarized image was subjected to Fourier transform using Fiber Orientation Analysis 8.13 Single software (trade name) to obtain a power spectrum, and an orientation angle and orientation strength were obtained from an elliptical distribution diagram. The orientation angle indicates the angle at which the fibers are most oriented, and the orientation strength indicates the strength at the orientation angle. The larger the orientation strength value, the more the fibers are aligned.
In addition, the orientation angle and orientation strength in the orientation q 11 are the results of measuring the fiber state at the substantially central portion in the thickness direction of the first protrusion top 11.
<Measurement of absorption time>
The surface sheet was removed from a commercially available baby diaper (trade name “Merry's Sarah Air-Through M size”) manufactured by Kao Corporation. Instead, a non-woven fabric test piece cut into 100 × 250 mm was laminated, and its periphery was fixed and evaluated. I got a baby diaper. A load of 20 g / cm 2 was evenly applied on the non-woven fabric test piece, and a cylinder with a cross-sectional area of 1000 mm 2 placed at almost the center of the test piece was applied, and artificial urine was injected therefrom. As the artificial urine, physiological saline was used, and the artificial urine was injected three times by 40 g every 10 minutes, and the time (seconds) to be absorbed was measured. The measurement results of each sample are shown in Table 1 below.
<Measurement of liquid return amount>
The surface sheet is removed from the commercially available baby diaper (trade name “Merry's Sarasara Air-Through M size”) of Kao Corporation. Instead, the non-woven fabric test specimen 1 cut out to 100 × 250 mm is laminated, and its periphery is fixed. A baby diaper for evaluation was obtained. A load of 20 g / cm 2 was evenly applied on the non-woven fabric test piece, and a cylinder with a cross-sectional area of 1000 mm 2 placed at almost the center of the test piece was applied, and artificial urine was injected therefrom. As the artificial urine, physiological saline was used, and after 40 g of artificial urine was injected three times every 10 minutes, the load of 20 g / cm 2 was removed and a load of 4.9 kPa was applied on the nonwoven fabric specimen. After the filter paper was placed and allowed to stand for 2 minutes, the weight change of the filter paper was defined as the liquid return amount (g). The measurement results of each sample are shown in Table 1 below.
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（試験体１〜５）によれば、特定の突出部の頂部における繊維密度が好適化されており、他方の突出部の頂部においては繊維配向性が好適化されていることが分かる。それにより、吸収時間が短く、液戻り量の少ない吸収性物品の表面シート等として優れた性能を発揮することが分かる。試験体ｃ１〜ｃ３においては、繊維密度、繊維配向性が好適化されていないため、効果が十分に発揮できない。 From the above results, according to the nonwoven fabric (test bodies 1 to 5) according to a preferred embodiment of the present invention, the fiber density at the top of the specific protrusion is optimized, and the fiber at the top of the other protrusion is fiber. It can be seen that the orientation is optimized. Thereby, it can be seen that the absorbent sheet exhibits excellent performance as a surface sheet or the like of an absorbent article having a short absorption time and a small liquid return amount. In the test bodies c1 to c3, since the fiber density and fiber orientation are not optimized, the effects cannot be sufficiently exhibited.
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
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 2nd protrusion top part 1st surface side 21b 2nd protrusion part top part 2nd surface side 2k 2nd protrusion part Internal space 3 Wall part 6 Ridge part 9 Protrusion 10 Nonwoven fabric T Sheet thickness
Claims (8)
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011271648A JP5921866B2 (en) | 2010-12-24 | 2011-12-12 | Non-woven |
| RU2016104532A RU2642033C1 (en) | 2010-12-24 | 2011-12-21 | Non-woven material and absorbing product using it |
| MYPI2013701072A MY161013A (en) | 2010-12-24 | 2011-12-21 | Nonwoven fabric and absorbent article using the same |
| 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 |
| PCT/JP2011/079732 WO2012086730A1 (en) | 2010-12-24 | 2011-12-21 | Non-woven fabric, and absorbent article using same |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010288535 | 2010-12-24 | ||
| JP2010288535 | 2010-12-24 | ||
| JP2011271648A JP5921866B2 (en) | 2010-12-24 | 2011-12-12 | Non-woven |
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| Publication Number | Publication Date |
|---|---|
| JP2012144835A true JP2012144835A (en) | 2012-08-02 |
| JP2012144835A5 JP2012144835A5 (en) | 2015-01-29 |
| JP5921866B2 JP5921866B2 (en) | 2016-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2011271648A Active JP5921866B2 (en) | 2010-12-24 | 2011-12-12 | Non-woven |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160140661A (en) | 2014-04-04 | 2016-12-07 | 유니챰 가부시키가이샤 | Nonwoven fabric |
| KR20160141719A (en) | 2014-04-04 | 2016-12-09 | 유니챰 가부시키가이샤 | Absorbent article |
| KR20170021791A (en) | 2014-06-26 | 2017-02-28 | 유니챰 가부시키가이샤 | Non-woven fabric |
| EP3741206A1 (en) | 2019-05-20 | 2020-11-25 | Unicharm Corporation | Absorbent sheet for pets |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018148640A1 (en) | 2017-02-13 | 2018-08-16 | The Procter & Gamble Company | Methods of making three-dimensional laminates for absorbent articles |
| WO2018204613A1 (en) | 2017-05-03 | 2018-11-08 | The Procter & Gamble Company | Absorbent article having multiple zones |
| EP3706697B1 (en) | 2017-11-06 | 2023-11-08 | The Procter & Gamble Company | Structure having nodes and struts |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04327255A (en) * | 1991-04-26 | 1992-11-16 | Nippon Filcon Co Ltd | Belt provided with projection for producing nonwoven fabric and production of nonwoven fabric having formed pattern |
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2011
- 2011-12-12 JP JP2011271648A patent/JP5921866B2/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04327255A (en) * | 1991-04-26 | 1992-11-16 | Nippon Filcon Co Ltd | Belt provided with projection for producing nonwoven fabric and production of nonwoven fabric having formed pattern |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160140661A (en) | 2014-04-04 | 2016-12-07 | 유니챰 가부시키가이샤 | Nonwoven fabric |
| KR20160141719A (en) | 2014-04-04 | 2016-12-09 | 유니챰 가부시키가이샤 | Absorbent article |
| KR20170021791A (en) | 2014-06-26 | 2017-02-28 | 유니챰 가부시키가이샤 | Non-woven fabric |
| EP3741206A1 (en) | 2019-05-20 | 2020-11-25 | Unicharm Corporation | Absorbent sheet for pets |
| US11533887B2 (en) | 2019-05-20 | 2022-12-27 | Unicharm Corporation | Absorbent sheet for pets |
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| JP5921866B2 (en) | 2016-05-24 |
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