JP3874693B2 - Absorbent articles - Google Patents

Description

【００６６】
【表２】

【００６７】
〔実施例５〕
・生理用ナプキンの製造
図１及び図２に示す生理用ナプキンを製造した。吸収体４として吸収体Ａを用いた。表面シート２として、ポリエチレンテレフタレート／ポリエチレン芯鞘型複合繊維からなる坪量２５ｇ／ｍ²のサクションヒートボンド不織布を用いた。この不織布には直径０．８ｍｍの開孔を多数形成してある。開孔率は１０％とした。裏面シート３として坪量２５ｇ／ｍ²ポリエチレンフィルムを用いた。裏面シート３の外側には、着衣固定用のホットメルト粘着剤を、長手方向に沿って２本塗工した。塗工長さは１５０ｍｍ、幅２０ｍｍ，坪量３０ｇ／ｍ²とした。ホットメルト粘着剤は、長さ１７０ｍｍ、幅６０ｍｍの剥離紙で保護した。このようにして得られたナプキンの長さは２００ｍｍ、幅は９５ｍｍであった。
【００６８】
〔実施例６〜８及び比較例５〜１０〕
吸収体Ａに代えて吸収体Ｂ〜Ｄを用い、実施例６〜８の生理用ナプキンを得た。また吸収体Ａに代えて吸収体Ｅ〜Ｊを用いて、比較例５〜１０の生理用ナプキンを得た。
【００６９】
〔ナプキンの評価〕
実施例及び比較例で得られた生理用ナプキンについて、以下の方法で漏れ発生数及びよれ率を測定し、着用感を評価した。その結果を表３及び４に示す。
【００７０】
〔漏れ発生数の測定〕
ナプキンをショーツに取り付け、このショーツを可動式女性腰部モデルに着用させた。可動式女性腰部モデルを１００歩／分の歩行速度で、１０分間歩行させた。引き続きモデルを歩行させながら、ナプキンに脱繊維馬血（日本バイオテスト研究所株製）を４ｇ／分の速度で５ｇ注入した。その後、モデルを更に２０分歩行させた。引き続き歩行させながら、ナプキンに脱繊維馬血を４ｇ／分の速度で３ｇ注入した。更にまたモデルを２０分歩行させた。引き続き歩行させながら、ナプキンに脱繊維馬血を、４ｇ／分の速度で３ｇ注入し、更に２０分歩行させた。脱繊維馬血を合計で５ｇ注入して２０分歩行させた後、及び合計で８ｇ注入して２０分歩行させた後それぞれの時点で、５枚のナプキンのうち漏れがが発生した枚数を数えた。
【００７１】
〔よれ率の測定〕
ナプキンをショーツに取り付け、このショーツを可動式女性腰部モデルに着用させた。この状態でのナプキンの初期装着幅Ｌ０を測定した。次いでモデルを１００歩／分の歩行速度で１０分間歩行させた。その後、モデルを歩行させながらナプキンに脱繊維馬血を４ｇ／分の速度で５ｇ注入した。その後、モデルを更に２０分歩行させた。引き続き歩行させながら、ナプキンに脱繊維馬血を、４ｇ／分の速度で３ｇ注入し、更に２０分歩行させた。脱繊維馬血を合計で８ｇ注入して２０分歩行させた後の時点で、ナプキンの装着幅Ｌｘを測定した。これらの値から、よれ率（％）＝（Ｌ０−Ｌｘ）×１００／Ｌ０を算出した。よれ率は、その値が小さいほどナプキンがよれにくいことを意味する。
【００７２】
〔着用感の評価〕
１種類のナプキンを各２枚、１枚につき２時間以上の着用時間で、２０人のモニターに着用させ、股間部における着用感を以下の基準で官能評価させた。
◎：９５％以上のモニターが違和感を感じない（１９人／２０人）
○：７５％以上のモニターが違和感を感じない（１５〜１８人／２０人）
△：６０％以上のモニターが違和感を感じない（１２〜１４人／２０人）
×：違和感を感じないモニターが６０％未満（〜１１人／２０人）
【００７３】
【表３】

【００７４】
【表４】

【００７５】
表１〜表４に示す結果から明らかなように、実施例１〜４の吸収体を用いた実施例５〜８の生理用ナプキンは、漏れも発生回数が少なく、よれにくく、しかも着用感が良好であることが判る。これに対し、比較例１〜４の吸収体を用いた比較例５〜８の生理用ナプキンは、漏れも発生回数が多く、よれが起こり易く、また違和感が生じやすいことが判る。
【００７６】
【発明の効果】
以上詳述した通り、本発明の吸収性物品は、柔軟でよれにくく、フィット性や着用感が良好となる。
【図面の簡単な説明】
【図１】本発明の一実施形態としての生理用ナプキンを示す斜視図である。
【図２】図１におけるII−II線断面図である。
【符号の説明】
１ 生理用ナプキン（吸収性物品）
２ 表面シート
３ 裏面シート
４ 吸収体
４１ 第１吸収層
４２ 第２吸収層
４３ 第３吸収層[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an absorbent article having an absorbent body that is flexible and difficult to knead, and has good fit and wearing feeling. Moreover, this invention relates to the manufacturing method of the absorber which is flexible and hard to scramble.
[0002]
[Prior art and problems to be solved by the invention]
In JP-A-7-24006, the absorber has a two-layer structure, and the first layer located on the top sheet side is composed of hydrophilic fibers and heat-sealed fibers having crimps, and the back sheet side. An absorbent article is described in which the second layer located at is composed of a superabsorbent polymer and a heat-sealed fiber having crimps. The invention described in this gazette is to guide the excreted liquid to the entire area of the absorber and to sufficiently exhibit the absorption performance of the superabsorbent polymer. However, the layer (second layer) containing the superabsorbent polymer in the absorbent body is composed of heat-sealed fibers having crimps, specifically, synthetic fibers such as parallel polyethylene / polypropylene composite fibers. Therefore, the liquid does not easily migrate from the first layer, and the desired absorption performance is not exhibited. Moreover, in the said absorber, since the heat-fusion fiber which has a crimp is heat-seal | fused, the softness | flexibility of an absorber is easy to be impaired due to the heat-seal | fusion.
[0003]
Another example of an absorbent body containing fibers having crimps is also described in JP-A-6-237958. However, the absorber described in this publication has a single layer structure. Also in the absorbent body described in this publication, the flexibility of the absorbent body is easily impaired because the crimped fibers are thermally fused.
[0004]
Accordingly, an object of the present invention is to provide an absorbent article that is flexible and hardly swayed and has good fit and a good feeling of wear.
[0005]
[Means for Solving the Problems]
  The present invention relates to an absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorbent interposed between the two sheets.
  The absorber comprises a first absorbent layer located on the side closest to the top sheet, and a second absorbent layer located on the side closest to the back sheet,
  The first absorption layer includesAn eccentric core-sheath type or side-by-side type made of polyolefin resin, polyester resin or polyamide resin, or a structural combination of these resinsContaining 40% by weight or more of crimped fibers of 1.1 to 4.4 dtex and a density of 0.03 to 0.15 g / cm^ThreeIn the first absorption layer, the crimped fibers are not joined together,
  The second absorbent layer has a higher Krem absorption height than the first absorbent layer; and
  A superabsorbent polymer is dispersed in a position below the first absorbent layer in the absorber.And
  The first absorbent layer and the second absorbent layer are joined and integrated by the adhesiveness developed by the wet superabsorbent polymer.The above object is achieved by providing an absorbent article.
[0007]
  According to the present invention, as a preferred method for producing an absorbent body in the absorbent article, the first absorption is achieved by heating a web containing crimpable fibers to a temperature equal to or higher than the crimp expression temperature of the fibers to crimp the fibers. A second absorbent layer produced separately from the first absorbent layer is overlaid with the first absorbent layer, and then both absorbent layers are joined together.Adhesiveness developed by wet superabsorbent polymerThe manufacturing method of the absorber joined and integrated by this is provided.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below based on preferred embodiments with reference to the drawings. FIG. 1 is a perspective view of a sanitary napkin as an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. The sanitary napkin 1 of the embodiment shown in FIGS. 1 and 2 has a vertically long shape, a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a liquid interposed between both sheets. A holding absorber 4 is provided.
[0010]
The top sheet 2 has a size larger than that of the absorber 4. The top sheet 2 covers the entire area on the upper surface side of the absorbent body 4, further covers both side portions in the longitudinal direction of the absorbent body 4, and reaches both left and right side sections on the back surface side of the absorbent body 4. On the other hand, the back sheet 3 has substantially the same width as the absorber 4 and is longer than the absorber 4. The back sheet 3 covers the entire area on the back side of the absorber 4. The back sheet 3 and the top sheet 2 reaching the back side of the absorber 4 are bonded and fixed by a predetermined bonding means such as heat seal or hot melt adhesive. An adhesive for fixing the napkin 1 to the clothes is applied to the outer surface of the back sheet 3 (not shown). This adhesive is protected by a release sheet (not shown).
[0011]
The top sheet 2 and the back sheet 3 respectively extend from the front and rear ends of the absorbent body 4, and the extended sheets 2 and 3 are bonded and fixed to each other by a bonding means such as heat seal.
[0012]
As the surface sheet 2 in the napkin 1 having the above-described configuration, a non-woven fabric made of thermoplastic resin fibers can be used. A number of apertures may be formed in this nonwoven fabric as shown in FIG. As the surface sheet 2, an apertured film can also be used. As the back sheet 3, a thermoplastic resin film can be used. This film may have moisture permeability.
[0013]
As shown in FIG. 2, the absorbent body 4 includes a first absorbent layer 41 positioned on the side closest to the top sheet 2 and a second absorbent layer 42 positioned on the side closest to the back sheet 3. Both absorption layers 41 and 42 are made of a fiber material. A third absorbent layer 43 made of superabsorbent polymer particles is disposed between the absorbent layers 41 and 42. In addition, due to the fact that both absorbent layers 41 and 42 are made of a fiber material, a part of the superabsorbent polymer particles of the third absorbent layer 43 is partly composed of the first absorbent layer 41 and / or the second absorbent polymer. It may be buried in the absorption layer 42.
[0014]
The first absorbent layer 41 contains crimped fibers of 1.1 to 4.4 dtex. The crimped fibers are not joined in the first absorption layer 41, and the fibers are in an intertwined state. That is, the crimped fiber is not thermally fused or bonded with a binder. Since the crimped fibers are not joined to each other, the first absorbent layer 41 becomes flexible. Moreover, since the freedom degree between fibers becomes high, it becomes difficult to produce a wrinkle in the 1st absorption layer 41, and it becomes difficult to twist. As a result, the absorbent body 4 becomes flexible as a whole, and it is difficult for wrinkles and kinks to occur, and the fit and wear feeling of the napkin 1 are improved.
[0015]
Since the first absorbent layer 41 includes crimped fibers that are intertwined with each other, the first absorbent layer 41 has a high density. As a result, the interfiber distance is reduced and a large capillary force is generated. Accordingly, the excreted liquid is immediately drawn into the first absorbent layer 41 through the top sheet 2, and so-called liquid flow in which the excreted liquid leaks along the surface of the top sheet 2 is prevented. In addition, even when wet, there is a degree of freedom between the crimped fibers, so that fibers contained in the first absorbent layer 41 other than the crimped fibers, for example, hydrophilic fibers described later may absorb water and swell. The first absorption layer 41 does not become excessively dense, and an appropriate density is maintained.
[0016]
Due to the high density of the first absorption layer 41, the first absorption layer 41 can be thinned. As a result, as will be described later, the thickness of the absorbent body 4 as a whole can be reduced, and the napkin 1 having good fit and wearing feeling can be obtained. Another advantage resulting from the high density of the first absorbent layer 41 is that the superabsorbent polymer particles are less likely to fall off. This is because the interfiber distance in the first absorbent layer 41 is reduced.
[0017]
The degree of densification of the first absorption layer 41 is 0.03 to 0.15 g / cm.^Three, Preferably 0.04 to 0.12 g / cm^ThreeMore preferably, 0.05 to 0.1 g / cm^ThreeDegree. If the density is increased to this level, the various advantages described above are effectively exhibited. The density of the first absorbent layer 41 is calculated by dividing the basis weight of the first absorbent layer 41 by its thickness.
[0018]
As described above, the fineness of the crimped fiber in the first absorbent layer 41 is 1.1 to 4.4 dtex, preferably 1.1 to 3.3 dtex, and more preferably 1.6 to 2.8 dtex. If the fineness of the crimped fiber is less than 1.1 dtex, the crimping force is weak and the density of the first absorbent layer 41 cannot be increased. If it exceeds 4.4 dtex, the space between the fibers is not reduced due to the thickness of the fibers themselves, and the first absorbent layer 41 cannot be densified. As a result, the thickness of the first absorption layer 41 is increased, the liquid drawability from the surface is weakened, and the surface flow is liable to occur.
[0019]
In order to effectively express the above-described various advantages due to the use of crimped fibers, in the first absorbent layer 41, the crimped fibers (1.1-4.4 dtex crimped fibers) It is contained in an amount of 40% by weight or more, preferably 60% by weight or more, and more preferably 80% by weight or more. As is clear from the examples described later, the first absorbent layer 41 may be composed of all crimped fibers. That is, the 1st absorption layer 41 may be comprised from 100% of crimped fiber. Alternatively, for the purpose of imparting desired performance to the first absorbent layer 41, one or more types of fibers other than the crimped fibers may be included in the first absorbent layer 41. In this case, the amount other than the crimped fiber is preferably 40% by weight or less, particularly preferably 30% by weight or less for each type. Examples of fibers other than the crimped fibers include adhesive fibers and hydrophilic fibers described later. Moreover, it is not prevented that the first absorbent layer 41 contains crimped fibers having a fineness of less than 1.1 dtex and / or greater than 4.4 dtex.
[0020]
The crimped fibers include polyolefin resins such as polypropylene and polyethylene, fibers made of polyester resins or polyamide resins such as polyethylene terephthalate, or an eccentric core-sheath type or side-by-side type that structurally combines these resins. Bicomponent fibers can be used. These fibers are preferably hydrophilized with a surfactant.
[0021]
The crimped mode of the crimped fiber may be two-dimensional or three-dimensional. From the viewpoint of increasing the entanglement between the fibers and increasing the density of the first absorbent layer 41, it is preferable to use a three-dimensionally crimped fiber. Three-dimensional crimping can be manifested by the difference in thermal shrinkage between the components of the composite fiber. The number of crimps of the crimped fiber is preferably 4 to 30, more preferably 8 to 20 per inch.
[0022]
The first absorbent layer 41 may contain other fibers in addition to the crimped fibers. For example, adhesive fibers can be contained from the viewpoint of sufficiently increasing the density of the first absorbent layer 41 and increasing the strength of the first absorbent layer 41. The reason why the strength of the first absorbent layer 41 is increased is that, for example, a network is formed by bonding adhesive fibers together. The reason why the density of the first absorbent layer 41 is further increased is that when forming crimped fibers by crimping the crimpable fibers, a network is formed by fusing the adhesive fibers together. It is because it can suppress that the bulky space by the contracted fibers is formed. Examples of the adhesive fiber herein include hot water fusion fibers such as heat fusion fibers and polyvinyl alcohol fibers. These adhesive fibers have a lower melting point than that of the crimped fibers. In particular, it is preferable to use an adhesive fiber made of a resin having a melting point lower than that of the crimped fiber and not compatible with the crimped fiber.
[0023]
In the first absorbent layer 41, the adhesive fibers are bonded to each other, but the adhesive fibers and the crimped fibers are not bonded. That is, as described above, the crimped fibers are not bonded to each other, but in addition, the crimped fibers are not bonded to other fibers included in the first absorbent layer. As a result, the crimped fiber has a sufficient degree of freedom.
[0024]
When a heat-sealing fiber having a melting point lower than that of the crimped fiber is used as the adhesive fiber, the difference between the melting points of the resins constituting both fibers is 15 ° C. or more, particularly 20 ° C. or more. The layer 41 is preferable from the viewpoint of easy manufacture. When the crimped fiber is composed of two or more kinds of resins, the melting point of the fiber refers to the melting point of the resin having the lowest melting point.
[0025]
The adhesive fiber has a fineness of 1.1 to 4.4 dtex, particularly 1.6 to 2.7 dtex, which increases the density of the first absorbent layer 41 to reduce the thickness, and also allows the first absorbent layer 41 to be flexible. It is preferable from the point of keeping the property. In the case of using a heat-bonding fiber as the adhesive fiber, the heat-bonding fiber is contained in the first absorbent layer 41 in an amount of 10 to 40% by weight, particularly 20 to 30% by weight. This is preferable because the density and strength of the first absorption layer 41 can be sufficiently increased without impairing flexibility. When using a hot water fusion fiber as an adhesive fiber, for the same reason, the amount is preferably 1 to 5% by weight, particularly 1 to 3% by weight, in the first absorbent layer 41.
[0026]
The first absorbent layer 41 can also contain hydrophilic fibers. Thereby, the hydrophilicity of the 1st absorption layer 41 can be improved. As the hydrophilic fibers, natural cellulose fibers such as wood pulp and cotton pulp, cellulosic fibers such as regenerated cellulose fibers such as rayon and cupra, and hydrophilic synthetic fibers such as polyvinyl alcohol fibers and polyacrylonitrile fibers are used. be able to. Further, a hydrophobic synthetic fiber such as polyester fiber that has been subjected to a hydrophilic treatment can also be used. The hydrophilic fiber is contained in the first absorbent layer 41 in an amount of 1 to 40% by weight, particularly 1 to 30% by weight, without damaging the flexibility and density of the first absorbent layer 41. This is preferable because sufficient hydrophilicity can be imparted. In the case of using an adhesive hydrophilic fiber such as the polyvinyl alcohol fiber described above, the fiber needs to have a lower melting point than the crimped fiber as described above. In addition, it is preferable to use a hydrophilic treated adhesive fiber as the hydrophilic fiber because the hydrophilicity of the first absorbent layer 41 is improved and the strength and density of the first absorbent layer 41 are improved.
[0027]
The thickness of the first absorbent layer 41 is 0.2 to 2.8 mm, particularly 0.2 to 1.5 mm so that the flexibility of the first absorbent layer 41 is not impaired, and the absorber 4 It is preferable from the viewpoint of making the whole thin and improving the fit and wearing feeling of the napkin 1. From the same viewpoint, the first absorbent layer 41 has a basis weight of 20 to 200 g / m.², Especially 20-150 g / m²It is preferable that
[0028]
Next, the second absorption layer 42 will be described. From the point that the liquid absorbed in the first absorption layer 41 is quickly drawn into the second absorption layer 42 and the surface of the absorber 4 is dried, the second absorption layer 42 has a higher Klem absorption height than the first absorption layer 41 ( JIS P8141) is high. Specifically, the height of the clem absorption of the second absorption layer 42 is preferably 20% or more, particularly 50% or more higher than that of the first absorption layer 41. From the viewpoint of drawing the liquid more quickly, the height of the clem absorption of the second absorbent layer 42 is preferably 10 mm or more, particularly 30 mm. Moreover, it is preferable that the clem absorption height of the 1st absorption layer 41 is 5 mm or more, especially 10 mm or more.
[0029]
As one of means for making the height of the clem absorption of the second absorbent layer 42 higher than that of the first absorbent layer 41, it is possible to include hydrophilic fibers in the second absorbent layer 42. From this viewpoint, the second absorbent layer 42 preferably contains 60% by weight or more, particularly 80% by weight or more of hydrophilic fibers. The second absorbent layer 42 may all be composed of hydrophilic fibers. That is, the 2nd absorption layer 42 may be comprised from hydrophilic fiber 100%. Alternatively, fibers other than hydrophilic fibers may be included in the second absorbent layer 42 for the purpose of imparting desired performance to the second absorbent layer 42. The amount of fibers other than hydrophilic fibers is preferably 40% by weight or less, particularly preferably 20% by weight or less. As a hydrophilic fiber, the same thing as what is used for the 1st absorption layer 41 can be used 1 type, or 2 or more types. When hydrophilic fibers are included in the second absorbent layer 42, there is an advantage that the liquid can be smoothly transferred to the superabsorbent polymer.
[0030]
As another means for increasing the Klem absorption height of the second absorption layer 42 higher than that of the first absorption layer 41, capillary force is used as a force for drawing liquid from the first absorption layer 41 to the second absorption layer 42. Can be mentioned. That is, the fiber density of the second absorbent layer 42 may be designed higher than the fiber density of the first absorbent layer 41. Specifically, (a) a method in which fibers having a finer fineness than that of the first absorbent layer 41 are included in the second absorbent layer 42, and (b) a fiber than the crimpable fibers used in the first absorbent layer 41. A method in which fibers having a large crimping rate per one are included in the second absorbent layer 42, and (c) a region having a high fiber density (consolidated region) as represented by heat embossing treatment. The fiber density of the 2nd absorption layer 42 can be made higher than the fiber density of the 1st absorption layer 41 by the method of making. In particular, when a fiber density difference is provided between the first absorbent layer 41 and the second absorbent layer 42, a gradient may be provided in the fiber density of the entire first and second absorbent layers. A method of creating a higher density region than the first absorbent layer 41 only partially in the absorbent layer 42 is preferable in that a soft wearing feeling can be provided. Regarding the fiber density difference between the two absorbent layers, the second absorbent layer 42 preferably has a fiber density region 1.1 to 2 times that of the first absorbent layer 41. As in the case where the second absorbent layer 42 contains hydrophilic fibers, the liquid absorption of the second absorbent layer 42 is made higher than the fiber density of the first absorbent layer 41, so that the liquid can be transferred to the superabsorbent polymer. Become smooth. In addition to this, a dripping prevention effect is obtained.
[0031]
The thickness of the second absorbent layer 42 is preferably smaller than that of the first absorbent layer 41 so that the flexibility of the absorber 4 is not impaired. Specifically, the thickness of the second absorbent layer 42 is 90% or less, particularly 80% or less of the thickness of the first absorbent layer 41, from the point of ensuring the flexibility of the absorber 4 as a whole. preferable. For the same reason, the thickness of the second absorbent layer 42 itself is preferably 2.5 mm or less, particularly 1.0 mm or less. From the same viewpoint, the second absorbent layer 42 has a basis weight of 10 to 150 g / m.², Especially 10-100g / m²It is preferable that
[0032]
The second absorbent layer 42 may contain other fibers in addition to the hydrophilic fibers described above. For example, the second absorbent layer 42 can contain heat-bonding fibers and adhesive fibers such as hot-water bonding fibers such as polyvinyl alcohol fibers. Thereby, the strength of the second absorption layer 42 is increased and the density is higher than that of the first absorption layer 41. Furthermore, in the case of heating / compression integration with the first absorbent layer 41, if the same kind of fibers as the adhesive fibers contained in the first absorbent layer 41, integration becomes easier. The adhesive fibers contained in the second absorbent layer 42 are not restricted as the adhesive fibers contained in the first absorbent layer 41, and known ones can be used without particular limitation. The amount of the adhesive fiber in the second absorbent layer 42 is 10 to 40 weights from the point that when the heat-bonded fiber is used as the adhesive fiber, the strength can be sufficiently increased without impairing the hydrophilicity of the second absorbent layer 42. %, Particularly 10 to 20% by weight. When using a hot-water fusion fiber, it is preferable that it is 1 to 5 weight%, especially 1 to 3 weight% from the same reason.
[0033]
Next, the third absorption layer 43 will be described. The third absorbent layer 43 is formed by dispersing superabsorbent polymer particles between the second absorbent layer 42 and the first absorbent layer 41. That is, the superabsorbent polymer is dispersed at a position below the first absorbent layer 41 in the absorbent body 4, and the first absorbent layer 41 does not contain the superabsorbent polymer. In addition to the second absorbent layer 42 and the first absorbent layer 41, by forming the third absorbent layer 43 made of a superabsorbent polymer, the thickness of the entire absorbent body 4 can be reduced, and the napkin 1 can be made thinner. it can.
[0034]
Scattering basis weight of superabsorbent polymer is 20-100g / m², Especially 30-70 g / m²It is preferable from the point which can make the dispersion state of a superabsorbent polymer favorable, and the point of gel blocking between the superabsorbent polymers at the time of water absorption.
[0035]
As the superabsorbent polymer, those capable of absorbing water of about 30 times or more of its own weight are preferable. For example, starch-based, cellulose-based, and synthetic polymer-based materials can be used. In particular, starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, cross-linked sodium carboxymethyl cellulose, acrylic acid (salt) polymers, and the like are preferable. The shape may be any shape such as a spherical shape or a flake shape, and the particle size is preferably about 200 to 500 μm.
[0036]
In the absorber 4 composed of the above layers, the layers are joined and integrated. The absorber 4 has a bending recovery property of 0.35 gf · cm / cm or less, particularly 0.28 gf · cm / cm or less, which makes it difficult for the absorber 4 to twist and provides a good fit during use. This is preferable. The lower the value of bend recovery, the better, ideally 0. The method for measuring the bending recovery will be described in the examples described later.
It is measured as follows.
[0037]
The absorber 4 has a flexural rigidity of 0.02 to 0.3 gf · cm.²/ Cm, especially 0.02-0.15 gf · cm²/ Cm or less is preferable from the viewpoint of the softness of the absorbent body and the less uncomfortable feeling during use. The method for measuring the bending stiffness will be described in the examples described later.
[0038]
The absorber 4 has a thickness of 0.3 to 3 mm, particularly 0.3 to 1.5 mm. As a result, the absorbent body 4 can be made flexible, and the fit and wear feeling of the napkin 1 can be improved.
[0039]
Next, the preferable manufacturing method of the absorber 4 is demonstrated. As a first manufacturing method, the absorbent body 4 is manufactured by heating a web containing crimpable fibers to a temperature equal to or higher than the crimp expression temperature of the fibers to crimp the fibers to produce a first absorbent layer, A second absorbent layer produced separately from the first absorbent layer can be overlaid with the first absorbent layer, and then both absorbent layers can be joined and integrated by a predetermined joining means. The third absorbent layer is formed by spreading particles of a superabsorbent polymer on the second absorbent layer and overlaying the first absorbent layer thereon.
[0040]
As the crimpable fiber, for example, a latent crimped fiber can be suitably used. A latent crimp fiber refers to a fiber that contracts by application of heat and develops a three-dimensional crimp. A web containing crimpable fibers can be produced, for example, using a card machine. The obtained web is subjected to a heat treatment such as blowing hot air heated to a fiber crimping temperature or higher to crimp the fiber. In this case, care should be taken not to heat the crimpable fiber beyond its melting point. Thereby, the 1st absorption layer in the state where the crimped fiber is intertwined and not joined is obtained. In addition, you may give compression heating processes, such as a heat embossing, to a 1st absorption layer as a post process.
[0041]
The second absorption layer is manufactured separately from the first absorption layer. Various methods can be adopted as the method for producing the second absorbent layer depending on the types of fibers constituting the second absorbent layer. For example, when short fibers are used, a wet papermaking method or a dry web manufacturing method using the card machine described above can be used. When a continuous filament is used, the second absorbent layer can be formed by depositing melt-spun fibers on a conveyor belt and bonding the fibers together.
[0042]
The superabsorbent polymer particles are uniformly dispersed on the second absorbent layer, and the first absorbent layer is overlaid on the second absorbent layer so as to be joined and integrated. Alternatively, the superabsorbent polymer particles may be uniformly dispersed on the first absorbent layer, and the second absorbent layer may be superposed and joined together. Various methods can be used as the bonding method. For example, when the second absorbent layer is formed by a wet papermaking method, by spreading the superabsorbent polymer on the second absorbent layer in a wet state before drying, the superabsorbent polymer is moistened to exhibit adhesiveness, Each layer can be joined by the adhesiveness. When the superabsorbent polymer is sprayed on the first absorbent layer, the adhesiveness can be expressed by sprinkling a predetermined amount of water before and after spraying. In any case, in order to develop the tackiness of the superabsorbent polymer, it is preferable to wet the polymer to about 10 to 12% by weight of its weight. When the adhesiveness of the superabsorbent polymer is not used, the layers can be joined by spraying an adhesive or spirally applying a hot melt adhesive material. In the case where both the first absorbent layer and the second absorbent layer contain heat-fusible fibers that can be fused to each other, the layers can be joined by heating with or without pressure.
[0043]
As a second manufacturing method of the absorbent body 4, a web containing crimpable fibers is superposed on a previously manufactured second absorbent layer, and then both are heated to a temperature equal to or higher than the crimp expression temperature of the fibers. It is possible to use a method in which the first absorbent layer and the second absorbent layer are joined and integrated while being compressed under the state to crimp the fibers to form the first absorbent layer. The third absorbent layer is formed by spreading superabsorbent polymer particles on the second absorbent layer and overlaying the web thereon.
[0044]
The manufacturing method of the 2nd absorption layer in this 2nd manufacturing method is the same as that in the 1st manufacturing method. The superabsorbent polymer particles are uniformly dispersed on the second absorbent layer produced in advance. A web containing crimpable fibers is overlaid thereon. As the crimpable fiber, the same crimpable fiber used in the first production method can be used. The web production method is the same as in the first production method. After the webs are overlaid, each layer is heated to a temperature above the crimping temperature of the crimpable fibers contained in the web. As a result, the first absorbent layer is formed by crimping the fibers. At the same time, compression (embossing treatment) is performed under heating to bond the layers.
[0045]
As another method of the second production method, the adhesiveness that is expressed by uniformly dispersing the particles of the superabsorbent polymer on the prefabricated second absorbent layer and moistening the superabsorbent polymer can be used, or adhesion The second absorbent layer and the web can be joined using spraying of the agent, spiral coating of the hot-melt adhesive material, or fusion with a heat-fusible fiber. However, when this method is used, it is necessary to heat the web after joining to a temperature equal to or higher than the crimping temperature of the crimpable fiber contained in the web to crimp the fiber.
[0046]
The present invention is not limited to the embodiment. For example, in the above-described embodiment, the third absorbent layer made of particles of the superabsorbent polymer is disposed between the first absorbent layer 41 and the second absorbent layer 42. The particles may be contained in the second absorption layer, and the absorber may have a two-layer structure of the first absorption layer and the second absorption layer disposed in contact therewith.
[0047]
In addition, when the application basis weight of the superabsorbent polymer in the embodiment is small, a clear third absorbent layer 43 is not recognized between the first absorbent layer 41 and the second absorbent layer 42, and the first It may appear that the superabsorbent polymer particles are buried in the lower surface of the absorbent layer 41 and the upper surface of the second absorbent layer 42.
[0048]
Moreover, although the said embodiment concerns a sanitary napkin, this invention is applicable similarly to other absorbent articles, such as an incontinence pad, a panty liner, and a disposable diaper.
[0049]
[Example 1]
・ Manufacture of absorber A
A card web made of Daiwabo Co., Ltd.'s latent spiral crimped fiber (trade name: CPP fiber, 2.2 dtex, fiber length 51 mm, material polypropylene) is made and heat-treated at 120 ° C for 2 minutes in a heat dryer. The latent crimped fiber is crimped and the basis weight is 110 g / m.²The 1st absorption layer of was obtained. Separately, cross-linked pulp (trade name; HBA, manufactured by Weyerhaeuser Co.), wood chemical pulp (trade name; manufactured by SKEENA PRIME, Skeena Cellulose Co.), and polyvinyl alcohol fiber (trade name; fibril bond, Sanchang) Manufactured, 1.1 dtex, fiber length 3 mm) in a weight ratio of 78: 20: 2, dispersed and mixed in water, and a dry basis weight of 30 g / m²The second absorbent layer was wet-made using a papermaking net so that On the wet second absorbent layer before drying, the superabsorbent polymer has a basis weight of 40 g / m.²And sprayed uniformly. The 1st absorption layer was piled up on it, and compression drying was integrated with the Yankee dryer. Subsequently, a wave-like crepe process is applied in the width direction, and the total basis weight is 180 g / m.²Absorbent body A was obtained.
[0050]
[Example 2]
・ Manufacture of absorber B
Made by Daiwabo Co., Ltd., latent spiral crimped fiber (trade name: CPP fiber, 2.2 dtex, fiber length 51 mm, material polypropylene) and polyethylene / polyester core-sheath composite fiber (2.2 dtex, fiber length 51 mm) Are mixed with a weight ratio of 80:20 to produce a card web, heat-treated in a heat dryer at 120 ° C. for 2 minutes to crimp the latent crimped fibers, and further compressed and heat-treated for 3 minutes to obtain a basis weight of 90 g. / M²The 1st absorption layer of was obtained. Separately, cross-linked pulp (trade name; HBA, manufactured by Weyerhaeuser Co.), wood chemical pulp (trade name; manufactured by SKEENA PRIME, Skeena Cellulose Co.), and polyvinyl alcohol fiber (trade name; fibril bond, Sanchang) Manufactured, 1.1 dtex, fiber length 3 mm) in a weight ratio of 78: 20: 2, dispersed and mixed in water, and a dry basis weight of 30 g / m²The second absorbent layer was wet-made using a papermaking net so that On the wet second absorbent layer before drying, the superabsorbent polymer has a basis weight of 40 g / m.²And sprayed uniformly. The 1st absorption layer was piled up on it, and compression drying was integrated with the Yankee dryer. Next, wave-shaped creping is applied in the width direction, and the total basis weight is 160 g / m.²Absorber B was obtained.
[0051]
Example 3
・ Manufacture of absorber C
Made by Daiwabo Co., Ltd., latent spiral crimped fiber (trade name: CPP fiber, 2.2 dtex, fiber length 51 mm, material polypropylene) and polyethylene / polyester core-sheath composite fiber (2.2 dtex, fiber length 51 mm) A card web was prepared by blending a rayon staple cotton (1.7 dtex, fiber length 40 mm) manufactured by Daiwabo Rayon Co., Ltd. at a weight ratio of 60:20:20, and heated in a heat dryer at 120 ° C. for 2 minutes. Heat treated to crimp the latent crimped fibers, and further compressed and heat treated for 3 minutes, basis weight 90 g / m²The 1st absorption layer of was obtained. Separately, cross-linked pulp (trade name; HBA, manufactured by Weyerhaeuser Co.), wood chemical pulp (trade name; manufactured by SKEENA PRIME, Skeena Cellulose Co.), and polyvinyl alcohol fiber (trade name; fibril bond, Sanchang) Manufactured, 1.1 dtex, fiber length 3 mm) in a weight ratio of 78: 20: 2, dispersed and mixed in water, and a dry basis weight of 30 g / m²The second absorbent layer was wet-made using a papermaking net so that On the wet second absorbent layer before drying, the superabsorbent polymer has a basis weight of 40 g / m.²Then, the first absorbent layer was overlaid on top of it, and compressed and dried with a Yankee dryer. Next, wave-shaped creping is applied in the width direction, and the total basis weight is 160 g / m.²Absorber C was obtained.
[0052]
Example 4
・ Manufacture of absorber D
Made by Daiwabo Co., Ltd., latent spiral crimped fiber (trade name: CPP fiber, 2.2 dtex, fiber length 51 mm, material polypropylene) and polyethylene / polyester core-sheath composite fiber (2.2 dtex, fiber length 51 mm) A card web was prepared by blending together with rayon staple cotton (1.7 dtex, fiber length 40 mm) manufactured by Daiwabo Rayon Co., Ltd. at a weight ratio of 40:30:30, and heated in a heat dryer at 120 ° C. for 2 minutes. Heat treated to crimp the latently crimped fibers, and further compressed and heat treated for 3 minutes, basis weight 100 g / m²The 1st absorption layer of was obtained. Separately, cross-linked pulp (trade name; HBA, manufactured by Weyerhaeuser Co.), wood chemical pulp (trade name; manufactured by SKEENA PRIME, Skeena Cellulose Co.), and polyvinyl alcohol fiber (trade name; fibril bond, Sanchang) Manufactured, 1.1 dtex, fiber length 3 mm) in a weight ratio of 78: 20: 2, dispersed and mixed in water, and a dry basis weight of 30 g / m²The second absorbent layer was wet-made using a papermaking net so that On the wet second absorbent layer before drying, the superabsorbent polymer has a basis weight of 40 g / m.²Then, the first absorbent layer was overlaid on top of it, and compressed and dried with a Yankee dryer. Next, wavy creping is applied in the width direction, and the total basis weight is 170 g / m.²Absorbent body D was obtained.
[0053]
[Comparative Example 1]
・ Manufacture of absorber E
Basis weight of 35 g / m consisting of 100% polyethylene / polyester core-sheath composite fiber with a diameter of 15 μm (2.2 dtex)²The suction heat bond nonwoven fabric of this is manufactured, and let this be a 1st absorption layer. Separately, cross-linked pulp (trade name; HBA, manufactured by Weyerhaeuser Co.), wood chemical pulp (trade name; manufactured by SKEENA PRIME, Skeena Cellulose Co.), and polyvinyl alcohol fiber (trade name; fibril bond, Sanchang) Manufactured, 1.1 dtex, fiber length 3 mm) in a weight ratio of 78: 20: 2, dispersed and mixed in water, and a dry basis weight of 30 g / m²The second absorbent layer was wet-made using a papermaking net so that On the wet second absorbent layer before drying, the superabsorbent polymer has a basis weight of 40 g / m.²Then, the first absorbent layer was overlaid on top of it, and compressed and dried with a Yankee dryer. Next, wavy creping is applied in the width direction, and the total basis weight is 105 g / m.²Absorbent body E was obtained.
[0054]
[Comparative Example 2]
・ Manufacture of absorber F
Basis weight of 25 g / m consisting of 100% polyethylene / polyester core-sheath type composite fiber with a diameter of 15 μm (2.2 dtex)²The embossed suction heat bond nonwoven fabric is manufactured, and this is used as the first absorbent layer. Separately, cross-linked pulp (trade name; HBA, manufactured by Weyerhaeuser Co.), wood chemical pulp (trade name; manufactured by SKEENA PRIME, Skeena Cellulose Co.), and polyvinyl alcohol fiber (trade name; fibril bond, Sanchang) Manufactured, 1.1 dtex, fiber length 3 mm) in a weight ratio of 78: 20: 2, dispersed and mixed in water, and a dry basis weight of 30 g / m²The second absorbent layer was wet-made using a papermaking net so that On the wet second absorbent layer before drying, the superabsorbent polymer has a basis weight of 40 g / m.²Then, the first absorbent layer was overlaid on top of it, and compressed and dried with a Yankee dryer. Next, wave-like creping is applied in the width direction, total basis weight 95g / m²Absorber F was obtained.
[0055]
[Comparative Example 3]
・ Manufacture of absorber G
Cross-linked pulp (trade name; HBA, manufactured by Weyerhaeuser Co.), wood chemical pulp (trade name; manufactured by SKEENA PRIME, Skeena Cellulose Co.), and polyvinyl alcohol fiber (trade name; manufactured by Fibribond, Sansho, 1.1 dtex) And a fiber length of 3 mm) were dispersed and mixed in water at a weight ratio of 78: 20: 2, and the first absorbent paper was wet-made using a paper-making net. The basis weight of the first absorbent paper after drying is 70 g / m²Met. Apart from this, the dry basis weight is 40 g / m using a slurry having the same composition as the first absorbent paper.²The second absorbent paper was wet-made using a papermaking net so that A superabsorbent polymer was weighed 40 g / m on the wet second absorbent paper before drying.²Then, the first absorbent paper was overlaid on top of it and compressed and dried with a Yankee dryer. Next, wavy creping is applied in the width direction, and the total basis weight is 150 g / m.²Absorber G was obtained.
[0056]
[Comparative Example 4]
・ Manufacture of absorber H
Wood chemical pulp (trade name: SKEENA PRIME, manufactured by Skeena Cellulose Co.) is dispersed in water, and the dry basis weight is 18 g / m.²Wet paper using a papermaking net and dried to obtain an absorbent paper. On the resulting absorbent paper, a superabsorbent polymer was weighed 40 g / m²And sprayed uniformly. On top of this, wood chemical pulp (trade name: NB-416L, manufactured by Weyerhaeuser Co.) was weighed 200 g / m.²Air piled up so that Further, the absorbent paper is laminated on the top and compressed and integrated, and the total basis weight is 276 g / m.²Absorber H was obtained.
[0057]
[Comparative Example 5]
・ Manufacture of absorber I
A card web made of Daiwabo Co., Ltd., latent spiral crimped fiber (trade name: CPP fiber, 6.7 dtex, fiber length 51 mm, material polypropylene) was prepared, and this was heated at 120 ° C. in a heat dryer at 2 ° C. Weighing 110g / m after partial heat treatment²The 1st absorption layer of was obtained. Separately, cross-linked pulp (trade name; manufactured by HBA Weyerhaeuser Co.), wood chemical pulp (trade name; manufactured by SKEENA PRIME, Skeena Cellulose Co.), and polyvinyl alcohol fiber (trade name; manufactured by Fibribond, Sansho, 1.1 dtex, fiber length 3 mm) is dispersed and mixed in water at a weight ratio of 78: 20: 2, and the dry basis weight is 30 g / m.²Wet paper making using a paper making net. A superabsorbent polymer with a basis weight of 40 g / m on the wet paper before drying.²And sprayed uniformly. Before introducing the wet paper into the dryer, the first absorbent layer was superposed on the surface of the wet paper on which the superabsorbent polymer was applied. After that, it was introduced into a drying dryer, and both were bonded together and integrated by compression drying. Furthermore, wavy creping is applied in the width direction, and the total basis weight is 180 g / m.²Absorbent body I was obtained.
[0058]
[Comparative Example 6]
・ Manufacture of absorber J
Made from Daiwabo Co., Ltd., a latent spiral crimped fiber (trade name: CPP fiber, 6.7 dtex, fiber length 51 mm, material polypropylene) 100% basis weight after heat treatment is 80 g / m²A card web was made. The superabsorbent polymer, which has been wetted by about 10 to 12% by weight with respect to the dry weight of the superabsorbent polymer, has a basis weight of 40 g / m on this card web.²And sprayed uniformly. Apart from this, 100% of latent spiral crimped fiber (trade name; CPP fiber, 2.2 dtex, fiber length 51 mm, material polypropylene) manufactured by Daiwabo Co., Ltd. is used as a raw material, and the basis weight after heat treatment is 80 g. / M²The card web was prepared, and this card web was stacked on the surface of the superabsorbent polymer in the previously produced card web, and both card webs were compressed and integrated. Next, heat treatment was performed at 120 ° C. for 2 minutes in a heat dryer, and the total basis weight was 200 g / m.²Absorbent J was obtained.
[0059]
[Evaluation of absorber]
The absorbers obtained in the examples and comparative examples were measured in the following manner by the thickness and density of the first and second absorbent layers, the thickness of the absorber, the bending rigidity of the absorber, the bending recovery, the first and first The clem water absorption height of 2 absorption layers was measured. The results are shown in Tables 1 and 2.
[0060]
[Thickness and density of first and second absorption layers]
The first absorbent layer and the second absorbent layer are separated by carefully peeling off the first absorbent layer and the second absorbent layer from the absorbent body with the superabsorbent polymer layer as a boundary. Each separated absorption layer is cut out with a size of 20 mm × 20 mm or more to obtain a sample. The weight and area of the sample are measured, and the basis weight (W) is calculated. Using a Kato Tech compression tester (trade name: KES-FB3), a sample with a load area of 2 cm²The compression part having a circular compression surface is lowered. 0.5 g / cm in the thickness direction of the sample²Measure the thickness (h) when the load is applied. In this way, the thickness of each layer is measured. Then, the density of each layer is calculated from W / h. When the first absorbent layer and the second absorbent layer cannot be peeled from the absorber, the cross section of the absorber is cut and the thickness thereof is measured with a microscope.
[0061]
[Absorber thickness]
The load area is 3cm on the upper surface of the absorber.²(Disk with a radius of 9.8 mm), 2.5 g / cm²In this state, the thickness of the absorber was measured using a thickness meter.
[0062]
(Bending rigidity)
"Standardization and analysis of texture evaluation (2nd edition)" (author: Kikio Kawabata, publisher; Japan Textile Machinery Society, Texture Metrology and Standardization Research Committee, issue date: July 10, 1980) The method described on pages 27 to 28 was used. Specifically, the absorber was cut out with a dimension of 20 mm or more in the width direction and 20 mm or more in the longitudinal direction to obtain a sample. A sample was attached to a chuck of a pure bending tester (trade name; KES-FB2) manufactured by Kato Tech so that the distance between the chucks was 10 mm. The attachment direction is such that the longitudinal direction of the absorber is the bending direction. In order to reduce the influence of gravity, the sample is mounted vertically. Curvature K = -2.5 to + 2.5cm^-1Pure bending with constant velocity curvature is performed in the range of. Deformation speed is 0.50cm^-1/ Sec. By this operation, the relationship between the bending moment M per unit area of the sample and the curvature K (MK curve) is obtained. From the result, the bending stiffness B (gf · cm) per unit length, which is the slope of the MK curve.²/ Cm). B is K = 0.5cm^-1And 1.5cm^-1Slope between and K = −0.5 cm^-1And -1.5cm^-1Are measured from the characteristics of the process of increasing the absolute value of K, and are defined as Bf and Bb, respectively. The average value (Bf + Bb) / 2 was taken as the value of bending rigidity. The lower the bending stiffness value, the softer the absorber.
[0063]
[Bend recovery]
Pure bending is performed in the same manner as the measurement of bending rigidity to obtain an M-K curve. The average bending hysteresis width 2HB (gf · cm / cm) is measured from the result. Curvature K = -1cm^-1And 1cm^-1And 2HBf and 2HBb, respectively, and the average value (2HBf + 2HBb) / 2 was taken as the value of bend recovery. The smaller the hysteresis width, the higher the bending recovery of the absorber.
[0064]
[Clem water absorption height]
The 1st and 2nd absorption layers were taken out from the absorber by the same method as in the case of measuring the thickness of each absorption layer. Each extracted absorption layer was cut out at 15 mm in the width direction and 150 mm or more in the longitudinal direction to obtain a sample. The sample is suspended so that its longitudinal direction is the vertical direction so that there is no slack in the sample. Under this condition, the lower end of the sample is immersed in ion exchange water by 15 mm. Ten minutes after immersion, the height of the sucked-up water was measured with reference to the surface of the ion-exchanged water. The measurement was carried out 10 times, and the average value was taken as the Klem water absorption height.
[0065]
[Table 1]

[0066]
[Table 2]

[0067]
Example 5
・ Manufacture of sanitary napkins
The sanitary napkin shown in FIGS. 1 and 2 was produced. Absorber A was used as absorber 4. The surface sheet 2 has a basis weight of 25 g / m made of polyethylene terephthalate / polyethylene core-sheath composite fiber.²Suction heat bond nonwoven fabric was used. This nonwoven fabric has a large number of openings with a diameter of 0.8 mm. The hole area ratio was 10%. As the back sheet 3, the basis weight is 25 g / m.²A polyethylene film was used. Two hot melt adhesives for fixing clothes were applied to the outside of the back sheet 3 along the longitudinal direction. Coating length is 150mm, width 20mm, basis weight 30g / m²It was. The hot melt adhesive was protected with a release paper having a length of 170 mm and a width of 60 mm. The napkin thus obtained had a length of 200 mm and a width of 95 mm.
[0068]
[Examples 6 to 8 and Comparative Examples 5 to 10]
The sanitary napkins of Examples 6 to 8 were obtained using the absorbers B to D instead of the absorber A. Further, sanitary napkins of Comparative Examples 5 to 10 were obtained using the absorbent bodies E to J instead of the absorbent body A.
[0069]
[Evaluation of napkins]
About the sanitary napkin obtained by the Example and the comparative example, the number of leak occurrences and a twist rate were measured with the following method, and the feeling of wear was evaluated. The results are shown in Tables 3 and 4.
[0070]
[Measurement of the number of leaks]
A napkin was attached to the shorts, and the shorts were worn on a movable female waist model. The movable female waist model was walked for 10 minutes at a walking speed of 100 steps / minute. Subsequently, 5 g of defibrinated horse blood (manufactured by Nippon Biotest Laboratories) was injected into the napkin while walking the model. The model was then allowed to walk for another 20 minutes. While continuing to walk, 3 g of defibrinated horse blood was injected into the napkin at a rate of 4 g / min. Furthermore, the model was allowed to walk for 20 minutes. While continuing to walk, 3 g of defibrinated horse blood was injected into the napkin at a rate of 4 g / min and allowed to walk for another 20 minutes. After injecting a total of 5 g of defibrinated horse blood and walking for 20 minutes, and after injecting a total of 8 g and walking for 20 minutes, count the number of leaks out of 5 napkins at each time point. It was.
[0071]
[Measurement of twist rate]
A napkin was attached to the shorts, and the shorts were worn on a movable female waist model. The initial mounting width L0 of the napkin in this state was measured. The model was then allowed to walk for 10 minutes at a walking speed of 100 steps / minute. Thereafter, 5 g of defibrinated horse blood was injected into the napkin while walking the model. The model was then allowed to walk for another 20 minutes. While continuing to walk, 3 g of defibrinated horse blood was injected into the napkin at a rate of 4 g / min and allowed to walk for another 20 minutes. At a time point after injecting a total of 8 g of defibrinated horse blood and walking for 20 minutes, the mounting width Lx of the napkin was measured. From these values, the deflection rate (%) = (L0−Lx) × 100 / L0 was calculated. The drooling rate means that the smaller the value, the harder the napkin is.
[0072]
[Evaluation of wearing feeling]
Two kinds of napkins each were worn on a monitor of 20 people with a wearing time of 2 hours or more per sheet, and the wearing feeling in the crotch region was subjected to sensory evaluation based on the following criteria.
◎: More than 95% of monitors do not feel strange (19/20 people)
○: 75% or more monitors do not feel uncomfortable (15-18 people / 20 people)
Δ: 60% or more monitors do not feel uncomfortable (12-14 people / 20 people)
X: Less than 60% of monitors that do not feel strange (~ 11 people / 20 people)
[0073]
[Table 3]

[0074]
[Table 4]

[0075]
As is clear from the results shown in Tables 1 to 4, the sanitary napkins of Examples 5 to 8 using the absorbent bodies of Examples 1 to 4 have less occurrence of leakage, are less likely to twist, and are comfortable to wear. It turns out that it is favorable. On the other hand, it can be seen that the sanitary napkins of Comparative Examples 5 to 8 using the absorbers of Comparative Examples 1 to 4 have a large number of leaks, are liable to be kinked, and are likely to have a sense of incongruity.
[0076]
【The invention's effect】
As described above in detail, the absorbent article of the present invention is flexible and difficult to twist, and has good fit and a good feeling of wear.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a sanitary napkin as one embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
[Explanation of symbols]
1 Sanitary napkin (absorbent article)
2 Top sheet
3 Back sheet
4 Absorber
41 1st absorption layer
42 2nd absorption layer
43 3rd absorption layer

Claims (6)

In an absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet and a liquid-retaining absorbent interposed between both sheets,
The absorber comprises a first absorbent layer located on the side closest to the top sheet, and a second absorbent layer located on the side closest to the back sheet,
The first absorbent layer is made of a polyolefin-based resin, a polyester-based resin, or a polyamide-based resin, or an eccentric core-sheath type or a side-by-side type 1.1-4.4 dtex bag made by structurally combining these resins. It contains 40% by weight or more of crimped fibers and its density is 0.03 to 0.15 g / cm ³ , and in the first absorbent layer, the crimped fibers are not joined together,
The second absorbent layer has a higher Krem absorption height than the first absorbent layer, and a superabsorbent polymer is dispersed at a position below the first absorbent layer in the absorber ,
An absorbent article in which the first absorbent layer and the second absorbent layer are bonded and integrated by the adhesiveness developed by the wet superabsorbent polymer . The first absorbent layer and the second absorbent layer include heat-fusible fibers that can be fused to each other, and the first absorbent layer and the second absorbent layer are joined and integrated by the heat-fused fibers. The absorbent article according to claim 1. The absorbent article according to claim 1 or 2, wherein the crimped fiber is a crimp of a latent crimped fiber. The absorptive article according to any one of claims 1 to 3 in which said 2nd absorption layer contains hydrophilic textiles and hot water fusion textiles. The absorbent article according to any one of claims 1 to 4, wherein the second absorbent layer has a thickness smaller than that of the first absorbent layer. The method for producing an absorbent body in an absorbent article according to claim 1, wherein the first absorbent is prepared by heating a web containing crimpable fibers to a temperature equal to or higher than a crimp expression temperature of the fibers to crimp the fibers. A layer is manufactured, and a second absorbent layer produced separately from the first absorbent layer is overlapped with the first absorbent layer, and then the two absorbent layers are bonded and integrated by the adhesiveness developed by the highly absorbent polymer. The manufacturing method of the absorber made to do.

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