JP4974524B2 - Absorbent articles - Google Patents

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JP4974524B2
JP4974524B2 JP2005375180A JP2005375180A JP4974524B2 JP 4974524 B2 JP4974524 B2 JP 4974524B2 JP 2005375180 A JP2005375180 A JP 2005375180A JP 2005375180 A JP2005375180 A JP 2005375180A JP 4974524 B2 JP4974524 B2 JP 4974524B2
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absorbent
sheet
leak
groove
absorbent article
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JP2007175167A (en
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隆弘 加藤
泰生 豊島
高志 櫻井
進介 長原
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Kao Corp
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Kao Corp
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本発明は、生理用ナプキン、パンティライナ、おりものシート、失禁パッド等の吸収性物品に関する。   The present invention relates to absorbent articles such as sanitary napkins, panty liners, cage sheets, and incontinence pads.

従来より、生理用ナプキン等の吸収性物品における吸収層(表面シート及び吸収体の積層体)に圧縮加工により防漏溝を設ける技術が知られている(例えば、下記特許文献1参照)。特許文献1記載の生理用ナプキンにおける防漏溝は、吸収層が厚み方向に圧縮加工されて吸収体が凹むことにより形成されており、表面シート自体の厚みは略均一のままである。そのため、液吸収初期においては、吸収体の繊維構造内への液の取り込みや、吸収体内の吸水性ポリマーへの液の吸収により、液拡散効果が奏される。   2. Description of the Related Art Conventionally, a technique is known in which a leak-proof groove is provided by compression processing in an absorbent layer (a laminate of a topsheet and an absorbent body) in an absorbent article such as a sanitary napkin (see, for example, Patent Document 1 below). The leak-proof groove in the sanitary napkin described in Patent Document 1 is formed by compressing the absorbent layer in the thickness direction and denting the absorbent body, and the thickness of the topsheet itself remains substantially uniform. Therefore, in the initial stage of liquid absorption, a liquid diffusion effect is achieved by taking in the liquid into the fiber structure of the absorbent body and absorbing the liquid into the water-absorbing polymer in the absorbent body.

特開平9−108262号公報JP-A-9-108262

しかし、特許文献1記載の生理用ナプキンにおいては、液吸収が繰り返し行われた場合や短時間に大量の液吸収が行われた場合に、吸収体の繊維構造内に液が充満したり、吸水性ポリマーが膨潤することにより、液が拡散するための空間が消失して液拡散性が低下し易い。   However, in the sanitary napkin described in Patent Document 1, when the liquid absorption is repeatedly performed or when a large amount of liquid absorption is performed in a short time, the fiber structure of the absorbent body is filled with liquid or water absorption is performed. When the water-soluble polymer swells, the space for diffusing the liquid disappears and the liquid diffusibility tends to be lowered.

従って、本発明の目的は、吸収層に圧縮加工により防漏溝が設けられた吸収性物品において、液吸収が繰り返し行われた場合や短時間に大量の液吸収が行われた場合にも、吸収層に吸収された液の拡散性が優れている吸収性物品を提供することにある。   Therefore, the object of the present invention is to provide an absorbent article provided with a leak-proof groove by compression processing in the absorbent layer, even when liquid absorption is repeatedly performed or when a large amount of liquid absorption is performed in a short time, An object of the present invention is to provide an absorbent article having excellent diffusibility of the liquid absorbed in the absorbent layer.

本発明は、嵩高の不織布からなる表面シート及び圧縮変形性の低い吸収性シートが積層されてなる吸収層を有する吸収性物品であって、前記吸収層の肌当接面側には、平面視で連続線状に延びる防漏溝が設けられており、前記防漏溝は、前記吸収層を厚み方向に圧縮加工することで、前記表面シートと前記吸収性シートとが一体化されると共に、少なくとも該表面シートが凹むことにより形成されており、前記表面シートには、前記防漏溝の延びる方向に高圧縮部と低圧縮部とが交互に配列し、該低圧縮部から該高圧縮部に向けて疎密勾配が形成されている吸収性物品を提供することにより、上記目的を達成したものである。   The present invention is an absorbent article having an absorbent layer formed by laminating a surface sheet made of a bulky nonwoven fabric and an absorbent sheet having low compressive deformation, and the skin contact surface side of the absorbent layer has a plan view. In the leakage prevention groove, the topsheet and the absorbent sheet are integrated by compressing the absorption layer in the thickness direction, At least the top sheet is formed by recessing, and in the top sheet, a high compression portion and a low compression portion are alternately arranged in a direction in which the leakage prevention groove extends, and the high compression portion is formed from the low compression portion. The above-mentioned object is achieved by providing an absorbent article in which a density gradient is formed toward the surface.

本発明の吸収性物品によれば、吸収層に圧縮加工により防漏溝が設けられた吸収性物品において、液吸収が繰り返し行われた場合や短時間に大量の液吸収が行われた場合にも、吸収層に吸収された液の拡散性が優れている。   According to the absorbent article of the present invention, in the absorbent article in which a leak-proof groove is provided in the absorbent layer by compression processing, when liquid absorption is repeatedly performed or when a large amount of liquid absorption is performed in a short time Moreover, the diffusibility of the liquid absorbed in the absorption layer is excellent.

以下、本発明の吸収性物品を、その好ましい一実施形態である生理用ナプキンに基づき図面を参照しながら説明する。
本実施形態の生理用ナプキン1は、図1及び図2に示すように、嵩高の不織布からなる表面シート2及び圧縮変形性の低い吸収性シート4が積層されてなる吸収層Aと、吸収層Aの非肌当接面側に配設された裏面シート3とを有している。
Hereinafter, the absorbent article of this invention is demonstrated, referring drawings based on the sanitary napkin which is one preferable embodiment.
As shown in FIGS. 1 and 2, the sanitary napkin 1 of the present embodiment includes an absorbent layer A in which a top sheet 2 made of a bulky nonwoven fabric and an absorbent sheet 4 with low compressibility are laminated, and an absorbent layer. And a back sheet 3 disposed on the non-skin contact surface side of A.

表面シート2及び裏面シート3は、平面視で同形で、それぞれ長手方向前後縁部が半円形状で、幅方向両側縁部が幅方向内方に向けて湾曲した形状となっており、吸収性シート4よりも長さ及び幅が大きくなっている。
尚、本明細書において、特に明記のない限り、「長手方向」及び「幅方向」というときは、それぞれ「吸収性物品の長手方向」及び「吸収性物品の幅方向」を意味する。「上面」及び「下面」というときは、それぞれ「肌当接面(側の面)」及び「非肌当接面(側の面)」を意味する。
The top sheet 2 and the back sheet 3 have the same shape in a plan view, each having a semicircular shape in the longitudinal direction and both side edges in the width direction curved inward in the width direction. The length and width are larger than those of the sheet 4.
In the present specification, unless otherwise specified, “longitudinal direction” and “width direction” mean “longitudinal direction of absorbent article” and “width direction of absorbent article”, respectively. The terms “upper surface” and “lower surface” mean “skin contact surface (side surface)” and “non-skin contact surface (side surface)”, respectively.

表面シート2は、吸収性シート4の上面全域を被覆しており、裏面シート3は、吸収性シート4の下面全域を被覆している。表面シート2及び裏面シート3は、平面視で吸収性シート4の長手方向前後縁部及び幅方向両側縁部から延出している。表面シート2の上面には、幅方向両側縁部から吸収性シート4の幅方向両側縁部上に亘って、サイド防漏壁を形成する一対のサイド防漏部材5が設けられている。   The top sheet 2 covers the entire upper surface of the absorbent sheet 4, and the back sheet 3 covers the entire lower surface of the absorbent sheet 4. The top sheet 2 and the back sheet 3 extend from the longitudinal front and rear edges and the widthwise both edges of the absorbent sheet 4 in plan view. On the upper surface of the top sheet 2, a pair of side leakage prevention members 5 that form side leakage prevention walls are provided from both side edges in the width direction to both side edges in the width direction of the absorbent sheet 4.

吸収性シート4の長手方向前後縁部から延出した表面シート2及び裏面シート3は、エンドフラップF1を形成し、エンドフラップF1でそれらの長手方向前後縁部において互いに接合されて、半円弧状のエンドシールS1を形成している。吸収性シート4の幅方向両側縁部から延出した表面シート2及び裏面シート3は、サイドフラップF2を形成し、サイドフラップF2でそれらの幅方向両側縁部において、サイド防漏部材5と共に互いに接合されて、幅方向内方に向けて湾曲したサイドシール部S2を形成している。   The top sheet 2 and the back sheet 3 extending from the longitudinal front and rear edges of the absorbent sheet 4 form an end flap F1, and are joined to each other at the longitudinal front and rear edges by the end flap F1 to form a semicircular arc. The end seal S1 is formed. The top sheet 2 and the back sheet 3 that extend from both side edges in the width direction of the absorbent sheet 4 form side flaps F2, and the side flaps F2 at the both side edges in the width direction together with the side leak-proof members 5. The side seal portion S2 that is joined and curved inward in the width direction is formed.

サイド防漏部材5の長手方向前後縁部は、長手方向に延びる防漏壁シール部S3により表面シート2に接合されている。防漏壁シール部S3の存在しないサイド防漏部材5の長手方向中央部には、幅方向内方に開口したポケットが形成される。
裏面シート3の下面には、下着止着用の粘着部(図示せず)が設けられている。
The longitudinal front and rear edge portions of the side leakage preventing member 5 are joined to the topsheet 2 by a leakage preventing wall seal portion S3 extending in the longitudinal direction. A pocket that is opened inward in the width direction is formed in the center portion in the longitudinal direction of the side leak-proof member 5 where the leak-proof wall seal portion S3 does not exist.
An adhesive portion (not shown) for wearing underwear is provided on the lower surface of the back sheet 3.

表面シート2は、嵩高の不織布からなる。嵩高の不織布としては、例えば、図3に示すように、上面側の第1繊維層21と下面側の第2繊維層22とからなる凹凸シートが挙げられる。この凹凸シートにおいては、第1繊維層21と第2繊維層22とが部分的に熱融着されて熱融着部(接合部)23が形成されており、第1繊維層21は、熱融着部23以外の部位において圧縮弾性を有する多数の凸部24を形成している。   The top sheet 2 is made of a bulky nonwoven fabric. Examples of the bulky nonwoven fabric include an uneven sheet composed of a first fiber layer 21 on the upper surface side and a second fiber layer 22 on the lower surface side, as shown in FIG. In this concavo-convex sheet, the first fiber layer 21 and the second fiber layer 22 are partially heat-sealed to form a heat-sealed portion (joint portion) 23. A large number of convex portions 24 having compression elasticity are formed at portions other than the fused portion 23.

前記凹凸シートは、繊維集合体からなる第1繊維層21及び第2繊維層22を、熱エンボスにより所定のパターンで部分的に熱融着させた後、第2繊維層22を水平方向に熱収縮させて得られる。
詳細には、熱エンボスによる熱融着は、例えば、多数のエンボスピンが規則的に配設されたエンボス面(エンボスロールの周面等)を、第1繊維層21と第2繊維層22との積層体における第1繊維層21側に圧接させ、各ピンに熱圧された部位における、第1繊維層21及び/又は第2繊維層22の構成繊維を溶融させて行われる。第2繊維層22の熱収縮は、例えば、第2繊維層22を熱収縮性繊維から構成するか又は第2繊維層22中に熱収縮性繊維を含ませておき、第1繊維層21と第2繊維層22とを熱融着させると同時あるいは両者を熱融着させた後に、第2繊維層22を加熱処理することにより行われる。多数の凸部24は、第2繊維層22を水平方向に熱収縮させることにより、第1繊維層21における熱融着部23以外の部位が凸形に変形して生じたものである。
The concavo-convex sheet is obtained by partially heat-sealing the first fiber layer 21 and the second fiber layer 22 made of a fiber assembly in a predetermined pattern by hot embossing, and then heat the second fiber layer 22 in the horizontal direction. Obtained by contraction.
In detail, the heat fusion by heat embossing is, for example, an embossed surface (such as a peripheral surface of an embossing roll) in which a large number of embossed spins are regularly arranged, the first fiber layer 21 and the second fiber layer 22. This is performed by melting the constituent fibers of the first fiber layer 21 and / or the second fiber layer 22 in the portion that is press-contacted to the first fiber layer 21 side of the laminated body and is thermally pressed by each pin. The heat shrinkage of the second fiber layer 22 is, for example, configured by forming the second fiber layer 22 from heat-shrinkable fibers or including the heat-shrinkable fibers in the second fiber layer 22, When the second fiber layer 22 is heat-sealed, the heat treatment is performed on the second fiber layer 22 at the same time or after both of them are heat-sealed. A large number of convex portions 24 are produced by causing the second fiber layer 22 to thermally contract in the horizontal direction and deforming the portions other than the heat fusion portion 23 in the first fiber layer 21 into a convex shape.

多数の熱融着部23は、散点状且つ千鳥状に規則的に形成されており、熱融着部23同士の間の距離はほぼ一定である。
各凸部24は、それぞれドーム状をなしており、その内部は第1繊維層21を構成する繊維で満たされている。また、各凸部24が形成された部分における第1繊維層21と第2繊維層22との界面は、接合されていないが密着した状態とされている。
The large number of heat-sealing portions 23 are regularly formed in a dotted and zigzag manner, and the distance between the heat-sealing portions 23 is substantially constant.
Each convex portion 24 has a dome shape, and the inside thereof is filled with fibers constituting the first fiber layer 21. In addition, the interface between the first fiber layer 21 and the second fiber layer 22 in the portion where each convex portion 24 is formed is not bonded but is in close contact.

第1繊維層21の構成繊維は、実質的に熱収縮性を有しないか、又は後述する第2繊維層22の構成繊維の熱収縮温度以下で熱収縮しないものであることが好ましい。   It is preferable that the constituent fibers of the first fiber layer 21 have substantially no heat shrinkability or do not undergo heat shrinkage at a temperature equal to or lower than the heat shrink temperature of the constituent fibers of the second fiber layer 22 described later.

第2繊維層22の構成繊維としては、熱可塑性ポリマー材料からなり且つ熱収縮性を有するものが好適である。また、該構成繊維は、収縮後にもエラストマー的挙動を示すものであることが好ましい。そのような繊維の例としては、潜在捲縮性繊維が挙げられる。第2繊維層22中の潜在捲縮性繊維の含有割合は40〜100重量%であることが好ましい。潜在捲縮性繊維は、加熱される前は、従来の不織布用の繊維と同様に取り扱うことができ、且つ所定温度での加熱によって螺旋状の捲縮が発現して収縮する性質を有する繊維である。潜在捲縮性繊維を用いることで、熱収縮性とエラストマー的挙動の両者を同時に発現させることができる。   The constituent fiber of the second fiber layer 22 is preferably made of a thermoplastic polymer material and having heat shrinkability. Moreover, it is preferable that the constituent fibers exhibit an elastomeric behavior even after shrinkage. Examples of such fibers include latently crimpable fibers. The content ratio of the latent crimpable fibers in the second fiber layer 22 is preferably 40 to 100% by weight. The latent crimpable fiber is a fiber that can be handled in the same manner as a conventional nonwoven fabric fiber before being heated, and has a property that a helical crimp is developed and contracted by heating at a predetermined temperature. is there. By using latent crimpable fibers, both heat shrinkability and elastomeric behavior can be developed simultaneously.

潜在捲縮性繊維は、例えば収縮率の異なる2種類の熱可塑性ポリマー材料を成分とする偏心芯鞘型又はサイド・バイ・サイド型の複合繊維からなる。その例としては、特開平9−292325号公報や特許第2759331号明細書に記載のものが挙げられる。第2繊維層22は、例えば、このような潜在捲縮性繊維を含ませておき、第1繊維層21との熱融着と同時又はその後に、加熱により該繊維の捲縮を発現させ、収縮させる。このように、表面シート2は、構成繊維の一部に潜在捲縮性繊維を用いて形成することもできる。   The latent crimpable fiber is composed of, for example, an eccentric core-sheath type or side-by-side type composite fiber composed of two types of thermoplastic polymer materials having different shrinkage rates. Examples thereof include those described in JP-A-9-292325 and Japanese Patent No. 2759331. The second fiber layer 22 includes, for example, such latent crimpable fibers, and at the same time or after the heat fusion with the first fiber layer 21, the crimps of the fibers are expressed by heating, Shrink. Thus, the surface sheet 2 can also be formed using latent crimpable fibers as part of the constituent fibers.

表面シート2の厚みは、十分な深さの防漏溝6(詳細は後述)を形成し、防漏溝6における低圧縮部61と高圧縮部62との頂点の高低差や疎密勾配を形成するために、適度な厚みを有していることが好ましく、具体的には0.5mm以上であることが好ましく、0.5〜2.0mmであることが更に好ましい。   The thickness of the surface sheet 2 forms a leak-proof groove 6 having a sufficient depth (details will be described later), and forms a height difference or a density gradient at the apex of the low-compression portion 61 and the high-compression portion 62 in the leak-proof groove 6. Therefore, it is preferable to have an appropriate thickness, specifically 0.5 mm or more, and more preferably 0.5 to 2.0 mm.

吸収性シート4は、吸収性を有しているが、厚みが薄く、厚み方向の圧縮に対する圧縮変形性が極めて低い(圧縮されても変形し難い)シートである。また、吸収性シート4は、大きな圧縮力を加えると、僅かに凹むことあっても大きく凹むことはなく、その前に座屈変形して穿孔してしまうような剛性を有するシートである。
そのようなシートとしては、例えば、1枚の紙の内部に吸水性ポリマーの粒子が分散配置されてなる吸収性シートが挙げられる(例えば、特開平8−246395号公報参照)。このような吸収性シートは、例えば、湿式抄造された湿潤繊維ウエブ上に吸水性ポリマーの粒子を散布し、その上に紙を重ね合わせ、これらを乾燥、一体化させることで得ることができる。
The absorbent sheet 4 has absorptivity but is thin and has a very low compressive deformability with respect to compression in the thickness direction (not easily deformed even when compressed). In addition, the absorbent sheet 4 is a sheet having a rigidity such that when a large compressive force is applied, even if it is slightly recessed, the absorbent sheet 4 is not greatly recessed but is buckled and deformed before that.
Examples of such a sheet include an absorptive sheet in which water-absorbing polymer particles are dispersed in a single sheet of paper (see, for example, JP-A-8-246395). Such an absorptive sheet can be obtained, for example, by spraying water-absorbing polymer particles on a wet-fabricated wet fiber web, overlaying paper on it, and drying and integrating them.

また、吸収性シート4としては、構成繊維と重合性吸水性ポリマーとを重合を利用して複合化した吸収性シートが挙げられる(例えば、特開平11−93073号公報参照)。このような吸収性シートは、例えば、重合性吸水性ポリマーを含有する液状物を非成形繊維に付着させ、これらを重合させることで得ることができる。
また、吸収性シート4は、2枚の紙若しくは不織布の間に又は折り返した紙若しくは不織布の間に、吸水性ポリマーを挟み、その全体を挟圧して一体化することにより形成することができる。
Moreover, as the absorptive sheet 4, the absorptive sheet which compounded the constituent fiber and the polymerizable water-absorbing polymer using polymerization (for example, refer to JP-A-11-93073) can be mentioned. Such an absorbent sheet can be obtained, for example, by attaching a liquid material containing a polymerizable water-absorbing polymer to non-molded fibers and polymerizing them.
Moreover, the absorptive sheet 4 can be formed by sandwiching a water-absorbing polymer between two sheets of paper or non-woven fabric, or between folded paper or non-woven fabric, and pressing and integrating the whole.

吸水性ポリマーとしては、吸収性シート4の形成方法に適した各種吸水性ポリマーを用いることができる。
防漏溝6(詳細は後述)の下側における吸収性シート4中の吸水性ポリマーの含有率は、25%以上であることが好ましく、30%以上であることが更に好ましい。この含有率は、質量基準である。吸水性ポリマーの含有率が高いと、吸収性シート4全体の圧縮変形性が低くなる点から好ましい。
As the water absorbent polymer, various water absorbent polymers suitable for the method of forming the absorbent sheet 4 can be used.
The content of the water-absorbing polymer in the absorbent sheet 4 below the leak-proof groove 6 (details will be described later) is preferably 25% or more, and more preferably 30% or more. This content is based on mass. A high content of the water-absorbing polymer is preferable in that the compressive deformability of the entire absorbent sheet 4 is lowered.

裏面シート3としては特に制限はなく、本実施形態においては防漏性のフィルムシートが用いられている。
サイド防漏部材5としては、不織布やフィルムシート、紙等が挙げられ、防漏性の観点から液不透過性又は難透過性である疎水性不織布、防漏性のフィルムシート等が好ましく用いられ、本実施形態においては疎水性不織布が用いられている。
There is no restriction | limiting in particular as the back surface sheet 3, In this embodiment, the leak-proof film sheet is used.
Examples of the side leak-proof member 5 include a nonwoven fabric, a film sheet, paper, and the like, and a hydrophobic nonwoven fabric that is liquid-impermeable or hardly permeable, a leak-proof film sheet, and the like are preferably used from the viewpoint of leak-proof properties. In this embodiment, a hydrophobic nonwoven fabric is used.

吸収層Aの肌当接面側には、図1に示すように、平面視で連続線状に延びる防漏溝6が設けられている。本実施形態における防漏溝6の平面視形状は、環状、詳細には陸上トラック状(平行する一対の直線に半円弧曲線が連結されて形成された環状)である。本実施形態における防漏溝6の位置は、一対のサイド防漏部材5,5間の領域における長手方向中央部である。防漏溝6の幅は、好ましくは0.5〜5.0mmである。   On the skin contact surface side of the absorbent layer A, as shown in FIG. 1, a leak-proof groove 6 extending in a continuous line shape in a plan view is provided. The plan view shape of the leak-proof groove 6 in the present embodiment is an annular shape, specifically a land track shape (annular shape formed by connecting a semicircular arc curve to a pair of parallel straight lines). The position of the leak-proof groove 6 in the present embodiment is the central portion in the longitudinal direction in the region between the pair of side leak-proof members 5 and 5. The width of the leak-proof groove 6 is preferably 0.5 to 5.0 mm.

図2に示すように、表面シート2と吸収性シート4とは、防漏溝6により接合されている。詳細には、防漏溝6は、吸収層Aを厚み方向に圧縮加工することで、表面シート2と吸収性シート4とが一体化されると共に、少なくとも表面シート2が凹むことにより形成されている。そして、表面シート2には、防漏溝6の延びる方向に高圧縮部62と低圧縮部61とが交互に配列し、低圧縮部61から高圧縮部62に向けて疎密勾配が形成されている。   As shown in FIG. 2, the top sheet 2 and the absorbent sheet 4 are joined by a leak-proof groove 6. Specifically, the leak-proof groove 6 is formed by compressing the absorbent layer A in the thickness direction so that the topsheet 2 and the absorbent sheet 4 are integrated and at least the topsheet 2 is recessed. Yes. And in the surface sheet 2, the high compression part 62 and the low compression part 61 are alternately arranged in the direction where the leak-proof groove 6 extends, and the density gradient is formed toward the high compression part 62 from the low compression part 61. Yes.

表面シート2と吸収性シート4との一体化の形態は、それらの素材や一体化方法等により異なるが、例えば融着、圧着、繊維交絡である。   The form of integration of the surface sheet 2 and the absorbent sheet 4 varies depending on the material, the integration method, and the like, but is, for example, fusion, pressure bonding, or fiber entanglement.

低圧縮部61は低い応力で圧縮加工された部分であり、高圧縮部62は高い応力で圧縮加工された部分である。従って、低圧縮部61の頂点の高さは、高圧縮部62の頂点の高さよりも高くなっており、防漏溝6の底部には、防漏溝6の延びる方向に凹凸が形成されている。また、低圧縮部61の繊維密度は高圧縮部62の繊維密度よりも疎になっており(低くなっており)、低圧縮部61から高圧縮部62に向けて疎密勾配が形成されている。高圧縮部62の繊維密度は、低圧縮部61の繊維密度に対し、1.5倍以上であり、望ましくは2.0倍以上である。   The low compression portion 61 is a portion compressed by a low stress, and the high compression portion 62 is a portion compressed by a high stress. Therefore, the height of the apex of the low compression portion 61 is higher than the height of the apex of the high compression portion 62, and the bottom of the leak-proof groove 6 is uneven in the extending direction of the leak-proof groove 6. Yes. Further, the fiber density of the low compression portion 61 is sparser (lower) than the fiber density of the high compression portion 62, and a density gradient is formed from the low compression portion 61 toward the high compression portion 62. . The fiber density of the high compression part 62 is 1.5 times or more with respect to the fiber density of the low compression part 61, desirably 2.0 times or more.

吸収層Aが厚み方向に圧縮加工されると、嵩高の不織布からなる表面シート2は容易に凹み、その状態で塑性変形する。一方、圧縮変形性の低い吸収性シート4は、実質的に凹まないか、高圧縮部62の下側に位置する部分が、防漏溝6の延びる方向に非連続的(間欠的)に凹んで塑性変形する。   When the absorbent layer A is compressed in the thickness direction, the topsheet 2 made of a bulky nonwoven fabric is easily recessed and plastically deformed in that state. On the other hand, the absorbent sheet 4 with low compressive deformation is not substantially recessed, or the portion located below the high compression portion 62 is recessed discontinuously (intermittently) in the direction in which the leak-proof groove 6 extends. To plastically deform.

具体的には、防漏溝6には、図2(a)に示すように、表面シート2のみが凹んで形成された形態と、図2(b)に示すように、表面シート2及び吸収性シート4の両方が凹んで形成された形態とがある。
図2(a)に示す表面シート2のみが凹んで形成された防漏溝6においては、防漏溝6の高圧縮部62の下側における吸収性シート4が圧縮加工時に穿孔され難い。また、表面シート2が圧縮加工時にフィルム化され難い。
Specifically, as shown in FIG. 2A, only the topsheet 2 is formed in the leak-proof groove 6 so as to be recessed, and the topsheet 2 and the absorption as shown in FIG. There is a form in which both of the conductive sheets 4 are recessed.
In the leak-proof groove 6 in which only the top sheet 2 shown in FIG. 2A is recessed, the absorbent sheet 4 on the lower side of the high-compression portion 62 of the leak-proof groove 6 is not easily perforated during compression processing. Moreover, the surface sheet 2 is difficult to be formed into a film at the time of compression processing.

図2(b)に示す表面シート2及び吸収性シート4の両方が凹んで形成された防漏溝6においては、防漏溝6の高圧縮部62を形成する表面シート2は、高い応力で圧縮されるためフィルム化する場合があるが、高圧縮部62に流入した液は、低圧縮部61を経由して吸収性シート4に吸収される。
防漏溝6は、吸収性物品全体において、図2(a)に示す形態のみ又は図2(b)に示す形態のみから形成されていてもよく、両者の形態が混在して形成されていてよい。
In the leak-proof groove 6 in which both the top sheet 2 and the absorbent sheet 4 shown in FIG. 2B are recessed, the top sheet 2 that forms the high compression portion 62 of the leak-proof groove 6 has a high stress. Although it may be formed into a film because it is compressed, the liquid flowing into the high compression part 62 is absorbed by the absorbent sheet 4 via the low compression part 61.
The leak-proof groove 6 may be formed only in the form shown in FIG. 2A or only in the form shown in FIG. 2B in the entire absorbent article, and both forms are formed in a mixed manner. Good.

防漏溝6の深さ(表面シート2の頂点と高圧縮部62の頂点との高低差)H1は、好ましくは0.5〜5.0mm、更に好ましくは1.0〜4.0mmである。
低圧縮部61の頂点と高圧縮部62の頂点との高低差H2は、好ましくは0.25〜2.5mm、更に好ましくは0.5〜2.0mmである。
Depth of the leak-proof groove 6 (height difference between the top of the topsheet 2 and the top of the high compression portion 62) H1 is preferably 0.5 to 5.0 mm, more preferably 1.0 to 4.0 mm. .
The height difference H2 between the apex of the low compression portion 61 and the apex of the high compression portion 62 is preferably 0.25 to 2.5 mm, more preferably 0.5 to 2.0 mm.

このような、表面シート2が必ず凹むと共に、吸収性シート4が実質的に凹まないか防漏溝6の延びる方向に非連続的に凹んだ防漏溝6を形成する方法には特に制限はないが、例えば、以下の方法が挙げられる。   There is a particular limitation on the method of forming the leak-proof groove 6 that is necessarily recessed in the surface sheet 2 and that is not recessed in the absorbent sheet 4 or is discontinuously recessed in the direction in which the leak-proof groove 6 extends. For example, the following method may be mentioned.

防漏溝6の低圧縮部61及び高圧縮部62の形状に対応した凹凸形状を有する押圧部が設けられた押圧ロール(図示せず)を用いる。防漏溝6が形成されていない吸収層Aの表面側を、該押圧ロールで押圧してヒートシール加工する。ここで、表面シート2に、高圧縮部62と低圧縮部61とが交互に配列される防漏溝6を形成するには、加工条件を適当に設定することがある。特に重要な条件は、押圧部の形状(高さ、幅、凹凸形状等)、押圧圧力、加熱温度(ヒートシール温度)、押圧時間である。   A pressing roll (not shown) provided with a pressing portion having an uneven shape corresponding to the shape of the low compression portion 61 and the high compression portion 62 of the leakage preventing groove 6 is used. The surface side of the absorption layer A in which the leak-proof groove 6 is not formed is pressed with the pressing roll and heat-sealed. Here, in order to form the leak-proof grooves 6 in which the high compression portions 62 and the low compression portions 61 are alternately arranged on the top sheet 2, the processing conditions may be set appropriately. Particularly important conditions are the shape of the pressing part (height, width, uneven shape, etc.), pressing pressure, heating temperature (heat seal temperature), and pressing time.

本実施形態の生理用ナプキン1においては、吸収層Aが嵩高の不織布からなる表面シート2及び圧縮変形性の低い吸収性シート4が積層されて形成されている。そのため、吸収層Aが厚み方向に圧縮加工されて表面シート2と吸収性シート4とが一体化すると、表面シート2は容易に凹んで塑性変形し、連続線状の防漏溝6の全部〔図2(a)に示す形態〕又は一部〔図2(b)に示す形態〕を形成する。一方、吸収性シート4は、圧縮変形性が低いため、吸収層Aを圧縮加工して表面シート2が容易に凹んだとしても実質的に凹まない〔図2(a)に示す形態〕か、防漏溝6の延びる方向に非連続的(間欠的)に凹んで塑性変形する〔図2(b)に示す形態〕。
その結果、表面シート2には、表面シート2が必ず凹むと共に吸収性シート4が実質的に凹まないか防漏溝6の延びる方向に非連続的に凹んだ防漏溝6、別の見方をすると、高圧縮部62と低圧縮部61とが交互に配列し且つ低圧縮部61から高圧縮部62に向けて疎密勾配が形成されている防漏溝6が形成される。
In the sanitary napkin 1 of the present embodiment, the absorbent layer A is formed by laminating a surface sheet 2 made of a bulky nonwoven fabric and an absorbent sheet 4 having low compressive deformation. Therefore, when the absorbent layer A is compressed in the thickness direction and the topsheet 2 and the absorbent sheet 4 are integrated, the topsheet 2 is easily dented and plastically deformed, and all the continuous linear leak-proof grooves 6 [ Form shown in FIG. 2A] or a part [form shown in FIG. 2B] is formed. On the other hand, since the absorbent sheet 4 has low compressive deformability, even if the topsheet 2 is easily recessed by compressing the absorbent layer A, it is not substantially recessed (the form shown in FIG. 2 (a)), Indented discontinuously (intermittently) in the extending direction of the leak-proof groove 6 and plastically deformed (form shown in FIG. 2B).
As a result, the surface sheet 2 is necessarily recessed, and the absorbent sheet 4 is not substantially recessed or the leakage prevention groove 6 is recessed in a discontinuous manner in the direction in which the leakage prevention groove 6 extends. Then, the leakage prevention grooves 6 in which the high compression portions 62 and the low compression portions 61 are alternately arranged and a density gradient is formed from the low compression portions 61 toward the high compression portions 62 are formed.

このように構成された本実施形態の生理用ナプキン1によれば、表面シート2には、防漏溝6の延びる方向に高圧縮部62と低圧縮部61とが交互に配列し、低圧縮部61から高圧縮部62に向けて疎密勾配が形成されている。そのため、防漏溝6に流入した液は、低圧縮部61と高圧縮部62との間の疎密勾配に基づく毛管力により、低圧縮部61から高圧縮部62に向けて移行し、吸収性シート4に効率よく導かれる。
従って、着用者の肌に与える湿り感が低減し、長時間に亘って快適な使用感が継続する。そのため、液吸収が繰り返し行われた場合や短時間に大量の液吸収が行われた場合にも、吸収層に吸収された液の拡散性が優れている
According to the sanitary napkin 1 of the present embodiment configured as described above, the high compression portion 62 and the low compression portion 61 are alternately arranged in the surface sheet 2 in the direction in which the leakage prevention groove 6 extends, and the low compression A dense gradient is formed from the portion 61 toward the high compression portion 62. Therefore, the liquid that has flowed into the leakage preventing groove 6 moves from the low compression portion 61 toward the high compression portion 62 due to the capillary force based on the density gradient between the low compression portion 61 and the high compression portion 62, and absorbs the liquid. It is efficiently guided to the sheet 4.
Therefore, the feeling of wetness given to the wearer's skin is reduced, and a comfortable feeling of use continues for a long time. Therefore, even when liquid absorption is repeated or when a large amount of liquid absorption is performed in a short time, the diffusibility of the liquid absorbed in the absorption layer is excellent.

また、防漏溝6の延びる方向に沿って液の流れに方向性が発現するため、環状の防漏溝6の外方に液が漏れ難い。
表面シート2として図3に示す凹凸シートが用いられていると、吸収性シート4との当接層である下層の第2繊維層22は吸収性シート4に融着し難い。そのため、表面シート2の下層(第2繊維層22)に拡散通路が存在することになるため、液の面方向(厚み方向と直交する方向)の拡散性が高い。
Further, since the direction of the flow of the liquid is expressed along the direction in which the leakage preventing groove 6 extends, the liquid is difficult to leak outside the annular leakage preventing groove 6.
When the uneven sheet shown in FIG. 3 is used as the top sheet 2, the lower second fiber layer 22, which is a contact layer with the absorbent sheet 4, is difficult to be fused to the absorbent sheet 4. Therefore, since a diffusion path exists in the lower layer (second fiber layer 22) of the surface sheet 2, the diffusibility in the liquid surface direction (direction perpendicular to the thickness direction) is high.

本発明の吸収性物品は、前記実施形態に制限されることなく、本発明の趣旨を逸脱しない限り、適宜変更が可能である。
例えば、図4に示すように、環状の防漏溝6の内側に、吸収性物品(生理用ナプキン)1の長手方向に延びる別の防漏溝6’が、吸収性物品1の幅方向に離間して複数本設けられていてもよい。図4に示す実施形態においては、生理用ナプキン1の長手方向に直線状に延びる防漏溝6’が2本設けられている。このように環状の防漏溝6の内側に、長手方向に延びる防漏溝6’が設けられた形態によれば、環状の防漏溝6の内側において、長手方向への液の拡散性が更に向上する点で好ましい。
The absorbent article of the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the gist of the present invention.
For example, as shown in FIG. 4, another leak-proof groove 6 ′ extending in the longitudinal direction of the absorbent article (sanitary napkin) 1 is provided inside the annular leak-proof groove 6 in the width direction of the absorbent article 1. A plurality may be provided apart from each other. In the embodiment shown in FIG. 4, two leak-proof grooves 6 ′ extending linearly in the longitudinal direction of the sanitary napkin 1 are provided. As described above, according to the embodiment in which the leakage preventing groove 6 ′ extending in the longitudinal direction is provided inside the annular leakage preventing groove 6, the diffusibility of the liquid in the longitudinal direction is provided inside the annular leakage preventing groove 6. It is preferable in terms of further improvement.

防漏溝の平面視形状は、環状に制限されず、吸収性物品の長手方向に延びる直線状又は曲線状や、吸収性物品の幅方向に延びる直線状又は曲線状でもよい。
本発明の吸収性物品は、生理用ナプキン以外に、パンティライナ、おりものシート、失禁パッド等にも適用することができる。
The planar view shape of the leak-proof groove is not limited to an annular shape, and may be a linear shape or a curved shape extending in the longitudinal direction of the absorbent article, or a linear shape or a curved shape extending in the width direction of the absorbent article.
In addition to sanitary napkins, the absorbent article of the present invention can also be applied to panty liners, cage sheets, incontinence pads, and the like.

図1は、本発明の吸収性物品の一実施形態である生理用ナプキンを示す平面図である。FIG. 1 is a plan view showing a sanitary napkin which is an embodiment of the absorbent article of the present invention. 図2は、図1に示すII−II断面図である。2 is a cross-sectional view taken along the line II-II shown in FIG. 図3は、図1に示す生理用ナプキンにおける表面シートを示す図で、(a)は縦断面斜視図、(b)は(a)に示すB−B断面図である。3A and 3B are views showing a surface sheet of the sanitary napkin shown in FIG. 1, wherein FIG. 3A is a longitudinal sectional perspective view, and FIG. 3B is a sectional view taken along the line B-B shown in FIG. 図4は、別の実施形態の生理用ナプキンを示す平面図である。FIG. 4 is a plan view showing a sanitary napkin according to another embodiment.

符号の説明Explanation of symbols

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 吸収性シート
5 サイド防漏部材
6 防漏溝
61 低圧縮部
62 高圧縮部

1 Sanitary napkin (absorbent article)
2 Top sheet 3 Back sheet 4 Absorbent sheet 5 Side leak-proof member 6 Leak-proof groove 61 Low compression part 62 High compression part

Claims (4)

嵩高の不織布からなる厚み0.5mm以上の表面シート及び圧縮変形性の低い吸収性シートが積層されてなる吸収層を有する吸収性物品であって、
前記吸収層の肌当接面側には、平面視で連続線状に延びる防漏溝が設けられており、
前記防漏溝は、前記吸収層を厚み方向に圧縮加工することで、前記表面シートと前記吸収性シートとが一体化されると共に、少なくとも該表面シートが凹み、その状態で塑性変形することにより形成されており、
前記表面シートには、前記防漏溝の延びる方向に高圧縮部と低圧縮部とが交互に配列し、該低圧縮部から該高圧縮部に向けて疎密勾配が形成されており、
前記吸収性シートは、前記防漏溝の形成部位において、実質的に凹んでいないか又は前記防漏溝の延びる方向に非連続的に凹んでおり、
前記防漏溝の下側における前記吸収性シート中の吸水性ポリマーの含有率は25%以上である吸収性物品。
An absorbent article having an absorbent layer formed by laminating a surface sheet having a thickness of 0.5 mm or more made of a bulky nonwoven fabric and an absorbent sheet having low compressive deformation,
On the skin contact surface side of the absorbent layer, a leak-proof groove extending in a continuous line shape in plan view is provided,
The leak-proof groove is formed by compressing the absorbent layer in the thickness direction so that the topsheet and the absorbent sheet are integrated, and at least the topsheet is recessed and plastically deformed in that state. Formed,
In the surface sheet, a high compression portion and a low compression portion are alternately arranged in the extending direction of the leakage prevention groove, and a dense gradient is formed from the low compression portion toward the high compression portion,
The absorbent sheet is substantially not recessed at the site where the leakage preventing groove is formed, or is discontinuously recessed in the extending direction of the leakage preventing groove ,
The absorptive article whose content rate of the water-absorbent polymer in the absorptive sheet in the lower part of the leak-proof groove is 25% or more .
前記表面シートは、熱可塑性ポリマー材料からなり且つ所定温度での加熱によって螺旋状の捲縮が発現して収縮する熱収縮性を有する、潜在捲縮性繊維を含んで構成されている請求項1記載の吸収性物品。   2. The surface sheet is made of a thermoplastic polymer material, and is configured to include latent crimpable fibers having heat shrinkability that causes a helical crimp to shrink when heated at a predetermined temperature. The absorbent article as described. 前記防漏溝は、環状の平面視形状を有している請求項1又は2に記載の吸収性物品。 The absorbent article according to claim 1 or 2 , wherein the leakage prevention groove has an annular shape in plan view. 環状の前記防漏溝の内側に、吸収性物品の長手方向に延びる別の前記防漏溝が、吸収性物品の幅方向に離間して複数本設けられている請求項記載の吸収性物品。 The absorbent article according to claim 3 , wherein a plurality of other leakage prevention grooves extending in the longitudinal direction of the absorbent article are provided inside the annular leakage prevention groove and spaced apart in the width direction of the absorbent article. .
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