JP2017104502A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which has preferable touch feeling to a crotch, excellent in wearing feeling, and in which liquid spill hardly occurs.SOLUTION: An absorber 4 comprises: a core low rigidity area 40L which is positioned on a center part of a liquid absorbent core 40 in a lateral direction Y and extends in a vertical direction X; and core high rigidity areas 40H which are positioned on both sides of the area 40L in the lateral direction Y and have rigidity higher than that of the area 40L. A surface material 2 comprises: a surface material low rigidity area 2L which is overlapped to the core low rigidity area 40L in plan view and extends in the vertical direction X; and surface material high rigidity areas 2H which are positioned on both sides of the area 2L in the lateral direction Y and have rigidity higher than that of the area 2L, the areas 2H and the areas 40H are overlapped in plan view.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an absorbent article such as a disposable diaper.

  A typical form of the absorbent article includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and a vertically long absorbent body disposed between both sheets. The absorbent body is generally composed mainly of a liquid-retaining absorbent core containing an absorbent material such as wood pulp or a water-absorbing polymer, and further includes paper, non-woven fabric, etc. covering the absorbent core. There are also things.

  2. Description of the Related Art As a surface sheet of an absorbent article, a surface sheet having an uneven shape formed by a pressing process such as embossing is known on a skin facing surface directed toward the wearer's skin. In addition, by forming a concavo-convex shape on the skin-facing surface of the topsheet, it is also known to reduce the contact area with the skin of the wearer to improve air permeability and reduce stickiness to the skin. ing. For example, Patent Document 1 relates to a nonwoven fabric having a concavo-convex shape that can be used for a surface sheet of an absorbent article, and is provided with a pattern in which ridges and grooves extending in one direction are alternately arranged in a direction orthogonal to the one direction. In the formed nonwoven fabric, a plurality of regions having different heel heights are formed, and the diameters of the constituent fibers in the regions having relatively high heel heights among the plurality of regions are set to be relatively high. It is described that it is made thinner than that of the low region. In addition, patent document 1 makes it the main subject to manufacture easily the nonwoven fabric from which such an uneven | corrugated pattern differs partially, and it does not specifically describe the usage form and effect of such a nonwoven fabric.

  Further, as an absorbent core of an absorbent article, a block-shaped absorbent core provided with a groove-like space extending in the plane direction is known. Due to its structure, the block-like absorbent core is easily deformed flexibly against external forces, so that it conforms to the complex undulating skin surface and conforms to the human body that touches the surface without gaps, and the wearer's body It is excellent in the operation follow-up property that is deformed in accordance with the movement of the skin and maintains the state of contact with the skin surface. For example, in Patent Document 2, a low-rigidity region composed of a block region is formed in the center region in the width direction of a vertically long block-shaped absorbent core so as to extend in the longitudinal direction, and both left and right sides sandwiching the low-rigidity region. Describes forming a high-rigidity region consisting of non-blocking regions. Patent Document 2 does not describe the use of a surface sheet having an uneven shape together with a block-shaped absorbent core.

JP 2012-214938 A JP 2013-255666 A

  Since the crotch part arranged in the inseam of the wearer when worn in the absorbent article is sandwiched between the thighs of the wearer while wearing the absorbent article, the direction corresponding to the front and back direction of the wearer is the vertical direction, When the direction orthogonal to the vertical direction is the horizontal direction, the image is easily compressed in the horizontal direction. The conventional absorbent article is bent and deformed irregularly when the crotch is compressed in the lateral direction, so that the skin contact of the crotch is bad, and it is excreted from the excretion part of the wearer to the crotch The problem is that urine and other excreted liquids are not received at a predetermined site by irregular bending deformation of the crotch, so that so-called liquid splattering easily occurs, and even a small amount of excreted liquid tends to leak. was there.

  Therefore, the present invention relates to providing an absorbent article that has good skin contact with the crotch, is excellent in wearing feeling, and is unlikely to cause liquid leakage.

  The present invention comprises an absorbent body having an absorbent core containing an absorbent material, and a surface material disposed on the skin-facing surface side of the absorbent body, and a longitudinal direction corresponding to the wearer's front-rear direction and the longitudinal direction. An absorbent article having a transverse direction orthogonal to the core, wherein the absorbent body is located in a laterally central portion of the absorbent core and extends in the longitudinal direction, and a transverse direction of the core low stiffness area. A core high-rigidity region located on both sides in the direction and having a rigidity higher than that of the core low-rigidity region. A surface material high-rigidity region positioned on both lateral sides of the surface material low-rigidity region and having higher rigidity than the surface material low-rigidity region, the surface material high-rigidity region and the core It is an object of the present invention to provide an absorbent article that overlaps with a highly rigid region in plan view.

  ADVANTAGE OF THE INVENTION According to this invention, the absorptive article which is excellent in the feeling of wear to the crotch, is excellent in a feeling of wear, and hardly raise | generates a liquid leak is provided.

FIG. 1 is a plan view schematically showing a skin facing surface, that is, a surface sheet side of a disposable diaper that is an embodiment of the absorbent article of the present invention, in which an elastic member of each part is expanded and expanded in a planar shape. It is a top view in a state. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 3 is a plan view schematically showing a part of the skin facing surface of the topsheet arranged in the diaper shown in FIG. FIG. 4 is a perspective view schematically showing an enlarged part of the surface material low-rigidity region of the topsheet arranged in the diaper shown in FIG. 1. FIG. 5 is a perspective view schematically showing an enlarged part of the surface material high-rigidity region of the topsheet arranged in the diaper shown in FIG. 1. FIG. 6 is a plan view schematically showing a skin facing surface of an absorbent core in another embodiment of the absorbent article of the present invention.

  Hereinafter, the absorbent article of this invention is demonstrated with reference to drawings based on the preferable embodiment. The disposable diaper 1 which is one Embodiment of the absorbent article of this invention is shown by FIG.1 and FIG.2. The diaper 1 has an abdominal side 1F arranged on the abdomen side of the wearer when worn, a back side 1R arranged on the dorsal side, and a crotch 1M positioned therebetween, and from the abdominal side 1F. It extends to the back side 1R via the crotch 1M, and has a longitudinal direction X corresponding to the wearer's front-rear direction and a lateral direction Y orthogonal thereto. The abdominal side portion 1F, the crotch portion 1M, and the back side portion 1R correspond to respective regions when the diaper 1 is divided into three equal parts in the vertical direction X. The crotch part 1M has an excretion part facing part that is disposed to face an excretion part such as a wearer's penis when the diaper 1 is worn, and the excretion part facing part is usually a central part in the longitudinal direction X of the diaper 1 Or it is located in the vicinity.

As shown in FIGS. 1 and 2, the diaper 1 is an absorbent body 4 having an absorbent core 40 and a surface material that is disposed on the skin-facing surface side of the absorbent body 4 and can come into contact with the wearer's skin when worn. A liquid-permeable top sheet 2 and a liquid-impermeable or water-repellent back sheet 3 disposed on the non-skin-facing surface side of the absorber 4, and in plan view as shown in FIG. The central part of the vertical direction X located in the crotch part 1M is formed in a vertically long hourglass shape that is bound inward and is long in one direction, that is, the vertical direction X. Each of the top sheet 2 and the back sheet 3 has a size larger than that of the absorber 4 interposed between the sheets 2 and 3.
The top sheet 2 is longer than the absorbent body 4 in the longitudinal direction X, but is substantially the same as the absorbent body 4 in the lateral direction Y, that is, in the plan view as shown in FIG. Both side edges 2S, 2S along the longitudinal direction X of the sheet 2 coincide with both side edges along the longitudinal direction X of the absorbent body 4. As will be described later, the absorbent body 4 is configured to include an absorbent core 40 and a core wrap sheet 45, and both side edges 2S and 2S of the topsheet 2 are longitudinal in the maximum width portion of the absorbent core 40. It coincides with both side edges along X (see FIG. 2).
On the other hand, as shown in FIG. 2, the back sheet 3 has a size larger than that of the top sheet 2 in the lateral direction Y, extends outward from the peripheral edge of the absorbent body 4, and is in a developed and expanded state as shown in FIG. The outer shape of the diaper 1 is formed. As the back sheet 3, various materials conventionally used for this type of absorbent article can be used without particular limitation, and a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used.

  In the present specification, the “skin facing surface” is a surface of the absorbent article or its constituent member (for example, the absorbent body 4) that is directed toward the wearer's skin when the absorbent article is worn, that is, relative to the wearer's skin. The side close to the skin, and the “non-skin-facing surface” is the surface of the absorbent article or its constituent members that is directed to the side opposite to the skin side (clothing side) when the absorbent article is worn, that is, relatively worn The side far from the person's skin. In addition, "at the time of wearing" here means a state where a normal proper wearing position, that is, a correct wearing position of the absorbent article is maintained, and the absorbent article is in a state of being deviated from the wearing position. Is not included.

  Moreover, the side sheet | seat 5 is distribute | arranged to the right-and-left both sides along the vertical direction X in the surface sheet 2 side of the diaper 1, respectively. The side seat 5 has an inner edge along the vertical direction X, and an outer edge along the vertical direction X that is located outside the inner edge in the lateral direction Y, and has a flat surface as shown in FIG. In view, the inner edge overlaps with the absorber 4, and the outer edge extends outward in the lateral direction Y from the side edge along the longitudinal direction X of the absorber 4, as shown in FIG. 3 is joined. Between the side sheet 5 and the back sheet 3 in the left and right leg portions arranged around the legs of the wearer, it is fixed in a stretched state along the longitudinal direction X of the thread-like elastic member 50, whereby a diaper A pair of leg gathers is formed in the leg portion when 1 is worn by contraction of the elastic member 50. Further, a thread-like elastic member 51 is fixed to the inner edge portion of the side seat 5 in an elongated state along the longitudinal direction X. Accordingly, when the diaper 1 is worn, at least the crotch 1M due to the contraction of the elastic member 51. In the side sheet 5, the inner edge side stands up toward the wearer's skin side starting from the joint with the back sheet 3 to form a leak-proof cuff. This leak-proof cuff can prevent outflow of excretion fluid such as urine outward in the lateral direction Y, so-called lateral leakage. The top sheet 2, the back sheet 3, the absorbent body 4, the side sheet 5, and the elastic members 50 and 51 are joined to each other by a known joining means such as a hot-melt adhesive.

  The diaper 1 is a so-called unfolded disposable diaper. As shown in FIG. 1, a pair of fastening tapes 6 and 6 are provided on both side edges along the longitudinal direction X of the back side 1R of the diaper 1. . A fastening portion (not shown) made of a male member of a mechanical surface fastener is attached to the fastening tape 6. Moreover, the to-be-attached area | region 7 which consists of a female member of a mechanical hook-and-loop fastener is formed in the non-skin opposing surface of the belly side part 1F of the diaper 1. FIG. The to-be-attached region 7 is formed by attaching a female member of a mechanical hook-and-loop fastener to the non-skin facing surface of the back sheet 3 that forms the non-skin facing surface of the abdominal side portion 1F by a known joining means such as adhesive or heat seal. It is formed by joining and fixing, and the fastening portion of the fastening tape 6 can be detachably fastened.

Hereinafter, the absorber 4 will be described.
The absorbent body 4 has a shape that is long in the longitudinal direction X in a plan view as shown in FIG. 1, and extends from the ventral side 1F to the back side 1R including the crotch 1M. The absorbent body 4 includes a liquid-retaining absorbent core 40 containing an absorbent material, and a core wrap sheet 45 that covers the skin facing surface 40a and the non-skin facing surface 40b of the absorbent core 40. Yes. The absorbent core 40 and the core wrap sheet 45 are joined by a known joining means such as a hot melt adhesive. The absorber 4 (absorbent core 40) is formed symmetrically with respect to a virtual straight line (not shown) extending in the longitudinal direction X by dividing the diaper 1 into the transverse direction Y.

  The absorptive core 40 has a single-layer structure and has an hourglass shape in which a central portion in the longitudinal direction, that is, the longitudinal direction X is inwardly bounded in a plan view as shown in FIG. The absorbent core 40 is formed by stacking a core forming material including an absorbent material. As the absorbent material, those normally used as a material for forming this type of absorbent core can be used without any particular limitation. For example, hydrophilic fibers such as wood pulp, synthetic fibers treated with a hydrophilizing agent, and water absorption Include polymer particles. That is, the absorbent core 40 may be a hydrophilic fiber stack or a structure in which water-absorbing polymer particles are supported on the stack.

  As the core wrap sheet 45, a water-permeable sheet material can be used, and for example, paper, nonwoven fabric, or the like can be used. In the diaper 1 of the present embodiment, the core wrap sheet 45 is a single continuous core wrap sheet 45 having a width that is not less than 2 times and not more than 3 times the length of the absorbent core 40 in the lateral direction Y. As shown in FIG. 2, the single core wrap sheet 45 covers the entire area of the skin facing surface 40 a of the absorbent core 40, and the outer side in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent core 40. The extending portion is wound down below the absorbent core 40 and covers the entire area of the non-skin facing surface 40b of the absorbent core 40. The form of the core wrap sheet 45 is not limited to this. For example, the skin side core wrap sheet covering the skin facing surface 40a of the absorbent core 40 and the non-skin facing surface 40b of the absorbent core 40 are not covered. The skin side core wrap sheet may be included, and both sheets may be separate sheets.

The absorbent body 4 is located in the center portion of the absorbent core 40 in the lateral direction Y and extends in the longitudinal direction X, and is located on both sides of the core low stiffness region 40L in the lateral direction Y. It has a core high-rigidity region 40H having higher rigidity than the low-rigidity region 40L.
The core low-rigidity region 40L is a region in which a plurality of linear grooves 41 are formed in a lattice shape in a plan view as shown in FIG. 1, and extends from the ventral side portion 1F to the back side portion 1R including the crotch portion 1M. doing. The overall length in the longitudinal direction X of the core low-rigidity region 40L is shorter than that of the absorbent core 40, and the pair of grooves 41, 41 located on the outermost side in the longitudinal direction X are in the longitudinal direction X of the absorbent core 40. It is located inward in the vertical direction X from the front and rear ends. The length in the lateral direction Y of the core low-rigidity region 40L, that is, the length between the pair of grooves 41 and 41 located on the outermost side in the lateral direction Y is constant over the entire length in the longitudinal direction X of the region 40L. .
On the other hand, the core high-rigidity region 40H is a region other than the core low-rigidity region 40L in the absorbent core 40, and surrounds the core low-rigidity region 40L.

  In the diaper 1 of the present embodiment, the core low rigidity region 40L has a lower basis weight than the core high rigidity region 40H, and therefore the core low rigidity region 40L has a lower rigidity than the core high rigidity region 40H. . The reason why the basis weight of the core low rigidity region 40L is lower than that of the core high rigidity region 40H is that grooves 41 are formed on the non-skin facing surface 40b of the core low rigidity region 40L as shown in FIGS. Because it is. The core high rigidity region 40H is not formed with a recess such as the groove 41. In the core high rigidity region 40H, the skin facing surface 40a and the non-skin facing surface 40b are flat.

  The groove 41 is a recess formed by intentionally reducing the amount of core forming material containing the absorbent material as compared to the peripheral portion in a known absorbent core manufacturing method using a fiber stacking apparatus. It is not a so-called embossed groove, that is, a recess formed by embossing (pressing process) a flat plate-like absorbent core having a uniform basis weight and no irregularities on the surface. Therefore, the normal embossed groove has a higher density than the peripheral part because the core forming material is consolidated by embossing, but the groove 41 is not consolidated in the formation process, so the peripheral part There is no substantial difference in density in comparison with (non-grooved portion).

  A known method for manufacturing an absorbent core that can be used to form the groove 41 is, for example, a method for forming a core forming material that is supplied on an air stream and that is formed on the outer surface of a stacking device (such as a rotating drum). In this step, the step of depositing at the bottom is used. In such a step, the concave portion for accumulation is used, and the bottom opening corresponding to the portion where the groove 41 is to be formed is used. By using the recesses for accumulation whose rate is adjusted to be relatively low, the core low rigidity region 40L in which the grooves 41 are formed and the core high rigidity region 40H in which the grooves (recesses) are not formed are provided. The absorbent core 40 can be formed. In the absorbent core 40 formed in this way, as shown in FIGS. 1 and 2, the portion where the amount of core forming material is relatively small becomes the low basis weight portion 42 located at the portion where the groove 41 is formed. The portion having a relatively large amount of core forming material is the high basis weight portion 43 which is a portion where grooves (concave portions) are not formed.

  The core low-rigidity region 40L is relatively adjacent to the high basis weight portion 43 having a relatively high basis weight and a convex shape protruding toward the non-skin facing surface 40b side, and relatively It has a low basis weight portion 42 having a low basis weight and recessed toward the skin facing surface 40a, and the high basis weight portion 43 and the low basis weight portion 42 are integrally formed. And the groove | channel 41 which makes the core low-rigidity area | region 40L the low basic weight and low rigidity in contrast with the core high-rigidity area | region 40H is formed in the non-skin opposing surface 40b side in the formation position of the low basic weight part 42. It is a concave part. That is, the low basis weight portion 42 that is the formation site of the groove 41 has a lower basis weight and a smaller thickness than the high basis weight portion 43 that is the non-formation site of the groove (concave portion) in the core low rigidity region 40L. .

  In the core low-rigidity region 40L, as shown in FIG. 2, the non-skin facing surface 40b has a concavo-convex structure due to the presence of the plurality of grooves 41, whereas the skin facing surface 40a has such grooves. It does not have (concave part) and is flat. Thus, when the non-skin facing surface 40b side of the absorbent core 40 has an uneven structure, the absorbent core 40 is easily deformed flexibly by an external force applied to the absorbent core 40, so that the fit of the diaper 1 is improved. .

  In the core low-rigidity region 40L, as shown in FIGS. 1 and 2, a plurality of linear grooves 41 extend in the vertical direction X, and a plurality of linear grooves 41 also extend in the horizontal direction Y. The core low-rigidity region 40L is partitioned into a plurality of small regions by the plurality of linear grooves 41, that is, the low basis weight portions 42 that are orthogonal to each other as described above, and the small regions are divided into the high basis weight portions 43. It is. That is, each high basic weight part 43 is divided by the low basic weight part 42 (groove 41), and is independent independently. The shapes of the plurality of high basis weight portions 43 are substantially the same as each other, all of which have a rectangular shape in plan view, and the length in the vertical direction X is longer than the length in the horizontal direction Y. On the other hand, with respect to the low basis weight portion 42, the low basis weight portion 42 extends in both the vertical direction X and the horizontal direction Y and is connected to each other to form a continuous body. The width of the low basis weight portion 42 extending in the longitudinal direction X (the length in the direction orthogonal to the length direction) and the width of the low basis weight portion 42 extending in the lateral direction Y may be the same or different. Also good.

  As described above, the core low-rigidity region 40L has a block structure having a large number of block regions including the high basis weight portion 43 and the linear low basis weight portion 42 surrounding the high basis weight portion 43 over the entire circumference thereof. Each block area is individually independent. As shown in FIG. 1, the outermost periphery of the block structure is formed by a low basis weight portion 42. And the recessed part by the side of the non-skin opposing surface 40b of the absorptive core 40 in the formation position of the low basic weight part 42 is the groove | channel 41. FIG.

  Due to the presence of the core low-rigidity region 40L having such a block structure, the absorbent core 40 becomes flexible in both the vertical direction X and the horizontal direction Y, and as a result, the absorbent core 40 is worn by the wearer. It becomes easy to follow the shape of the body. Furthermore, excretion fluid such as urine can be guided by the relatively thin low-basis-weight portion 42 and flow therethrough, so that the diffusibility of the absorbent core 40 in the vertical direction X and the horizontal direction Y can be improved.

The ratio of the basis weight of the low basis weight portion 42 to the basis weight of the high basis weight portion 43, that is, the basis weight of the low basis weight portion 42 / the basis weight of the high basis weight portion 43 is preferably 20% or more, more preferably. 30% or more, and preferably 80% or less, more preferably 70% or less.
The basis weight of the low basis weight portion 42 itself is preferably 100 g / m ² or more, more preferably 150 g / m ² or more, and preferably 500 g / m ² or less, more preferably 400 g / m ² or less.
The basis weight of the high basis weight portion 43 itself is preferably 300 g / m ² or more, more preferably 350 g / m ² or more, and preferably 900 g / m ² or less, more preferably 800 g / m ² or less.
The basis weight is measured as follows.

<Measurement method of basis weight>
Cut along the boundary line between the low basis weight portion 42 and the high basis weight portion 43 in the absorbent core 40 using a single-edged razor manufactured by Feather Corporation. Ten pieces of the high basis weight portion 43 obtained by cutting were each measured using an electronic balance (Electronic balance GR-300 manufactured by A & D, accuracy: 4 digits after the decimal point). Find the average weight of the pieces. The calculated average weight is divided by the average area per piece of the high basis weight portion 43 to calculate the basis weight of the high basis weight portion 43. The basis weight of the core high-rigidity region 40H described later is calculated in the same manner as the basis weight of the high basis weight portion 43.
Next, along the boundary line extending in the longitudinal direction X of the diaper 1 among the boundary lines between the low basis weight portion 42 and the high basis weight portion 43, the length is 100 mm, and the width is the design dimension of the width of the low basis weight portion 42. In accordance with the above, five small pieces in the vertical direction X of the thin striped low basis weight portion 42 are cut out using a single blade razor manufactured by Feather. The five pieces obtained were each measured using an electronic balance (Electronic balance GR-300 manufactured by A & D, accuracy: 4 digits after the decimal point), and averaged to obtain the average weight of one piece of the low basis weight portion 42. . The calculated average weight is divided by the average area per piece in the longitudinal direction X of the low basis weight portion 42 to calculate the basis weight in the longitudinal direction X of the low basis weight portion 42. For the horizontal direction Y of the low basis weight portion 42, the basis weight is calculated in the same manner as the vertical direction X of the low basis weight portion 42.

The high basis weight portion 43 not only has a larger basis weight than the low basis weight portion 42 but also has a larger thickness. The ratio of the thickness of the low basis weight portion 42 to the thickness of the high basis weight portion 43, that is, the thickness of the low basis weight portion 42 / the thickness of the high basis weight portion 43 is preferably 30% or more, more preferably 40% or more, And preferably it is 90% or less, More preferably, it is 80% or less.
The thickness of the low basis weight portion 42 itself is preferably 1.5 mm or more, more preferably 2.5 mm or more, and preferably 4.5 mm or less, more preferably 4 mm or less.
The thickness of the high basis weight portion 43 itself is preferably 2 mm or more, more preferably 3 mm or more, and preferably 8 mm or less, more preferably 7 mm or less.
The thickness is measured as follows.

<Method for measuring thickness>
A sample is cut into a predetermined size, the measurement site is pressurized at 5 kPa for 10 minutes, and measurement is performed immediately after dewetting. The number of measurement points is 3 points or more including one or more of each of the abdominal side, crotch, and back side per one sheet, and the thickness is obtained by averaging two samples (6 or more measurement points). For example, the diaper 1 is cut in a longitudinal direction X or a lateral direction Y of the diaper 1 with a sharp razor, and the cross section of the cut sample is measured. When it is difficult to measure with the naked eye, the section of the cut sample may be observed and measured at a magnification of 20 to 100 times using, for example, a microscope (VHX-1000 manufactured by KEYENCE).

  On the other hand, the core high-rigidity region 40H surrounds the outer periphery of the core low-rigidity region 40L having a block structure over the entire region, as shown in FIG. The core low-rigidity region 40L and the core high-rigidity region 40H are partitioned by a low basis weight portion 42 located on the outermost periphery of the core low-rigidity region 40L. In the core high-rigidity region 40H, the thickness and basis weight at an arbitrary position are constant.

  As shown in FIG. 2, in the diaper 1 of the present embodiment, the thickness of the core high rigidity region 40H is substantially the same as the thickness of the high basis weight portion 43 of the core low rigidity region 40L. However, the relationship between the thickness of the core high rigidity region 40H and the thickness of the high basis weight portion 43 is not limited to this, and either one may be relatively large. Specifically, the thickness of the core high rigidity region 40H is preferably 2 mm or more, more preferably 3 mm or more, and preferably 8 mm or less, more preferably 7 mm or less. The method for measuring the thickness is as described above.

  The low basis weight portion 42 and the high basis weight portion 43 of the core low rigidity region 40L are integrally formed as described above. In addition to this, the block region composed of the low basis weight portion 42 and the high basis weight portion 43 and the core high rigidity region 40H located on the outer periphery thereof are also integrally formed. In this specification, “integrally molded” means that a plurality of parts, for example, the low basis weight portion 42 and the high basis weight portion 43 are not separated from each other without using a bonding means such as an adhesive or heat fusion. It means that they are integrated so that they are integrally formed from the same material. When a plurality of parts of the absorbent core 40 are integrally formed, the urine or other excretory fluid has continuity that can move smoothly.

  As described above, the core low-rigidity region 40L and the core high-rigidity region 40H are formed in the absorbent core 40. The core low-rigidity region 40L includes the low basis weight portion 42, which is the formation portion of the groove 41, and the high basis weight. The core high-rigidity region 40H is hard because the thickness and basis weight are constant, while the core low-rigidity region 40L is hard because the block structure including the amount portion 43 is flexible. The rigidity is lower than that of the core high rigidity region 40H.

  In this specification, “rigidity” refers to the degree of difficulty in bending the constituent members of absorbent articles such as absorbent cores and surface materials, and high rigidity means that the constituent members are difficult to bend. Say. The rigidity measurement method varies depending on the type of component, and the rigidity of the absorbent core can be evaluated by the bending rigidity measured by the following method. It can be evaluated that the smaller the measured value of the bending stiffness, the lower the rigidity of the measurement object, and the easier it is to bend.

<Measurement method of bending stiffness of absorbent core>
Remove the absorbent core from the absorbent article. The “absorbent core” herein includes a member mainly composed of an absorbent material such as pulp and water-absorbing polymer particles, and a so-called core wrap sheet that wraps the member. That is, strictly speaking, the measurement object of this method is not an absorbent core alone but an absorbent body further including a core wrap sheet. However, since the bending stiffness of the core wrap sheet is usually much smaller than that of the absorbent core, the measured value of the bending stiffness of the absorbent body can be regarded substantially as the measured value of the bending stiffness of the absorbent core itself. it can. If the absorbent article from which the absorbent core is taken out is a new article sealed in a packaging bag, the absorbent article taken out after opening the packaging bag is left at room temperature and normal pressure for 1 day or more, and then the absorbent core is removed. Take out. A predetermined measurement target part is cut out from the extracted absorbent core to obtain a measurement sample. For example, four rectangular portions having a length (width) 20 mm in the horizontal direction Y and a length 50 mm in the vertical direction X are cut out from each of the core low rigidity region 40L and the core high rigidity region 40H of the absorbent core 40 of the diaper 1. A measurement sample. More specifically, two rectangular portions are cut out from the ventral side portion 1F and the dorsal side portion 1R, respectively, from a position that is symmetrical in the lateral direction Y, and only the ventral side portion 1F or the dorsal side portion 1R is cut. Then, when the measurement sample cannot secure a predetermined size, it may be cut out across the crotch 1M.
For measurement of the bending rigidity of the measurement sample, a handle o meter can be used. For example, a texture tester (handle o meter method) “HOM-3 type” manufactured by Daiei Kagaku Seiki Seisakusho can be used. Place the measurement sample on the handle base of the handleometer so that the longitudinal direction of the measurement sample is perpendicular to the groove of 30 mm width carved on the support base, and the center of the measurement sample with a 2 mm thick blade Press and measure the force required at the time of pressing. For example, the bending stiffness is measured for each of the four measurement samples of the core low-rigidity region 40L and the core high-rigidity region 40H, and the average value of the measurement values of the four measurement samples is calculated for the region 40L or 40H. Bending rigidity.

The bending rigidity of the core low rigidity region 40L is preferably 3 g or more, more preferably 4 g or more, and preferably 10 g or less, more preferably 9 g or less.
The bending rigidity of the core high-rigidity region 40H is preferably 5 g or more, more preferably 6 g or more, and preferably 20 g or less, more preferably 15 g or less.
The difference in bending rigidity between the core low rigidity region 40L and the core high rigidity region 40H is preferably 1 g or more.
The bending stiffness in each of the regions 40L and 40H of the absorbent core 40 can be adjusted by appropriately adjusting the selection of the core forming material, the basis weight (arrangement form of the grooves 41 in the region 40L), and the like.

Hereinafter, the surface sheet 2 (surface material) will be described in detail.
In the plan view of the diaper 1 as shown in FIG. 1, the topsheet 2 has a topsheet low-rigidity region 2L that overlaps with the core low-rigidity region 40L and extends in the longitudinal direction X, and the topsheet low-rigidity region 2L in the lateral direction Y. The surface material high rigidity region 2H is located on both sides and has higher rigidity than the surface material low rigidity region 2L. In the diaper 1 of the present embodiment, the length, that is, the width in the lateral direction Y of the top sheet 2 is substantially the same as the width of the absorber 4.

  As shown in FIG. 2, the surface material low-rigidity region 2L is located at the central portion in the lateral direction Y of the diaper 1, and a pair of surface material high-rigidity regions 2H, 2H is located. In the diaper 1 of this embodiment, the pair of surface material high-rigidity regions 2H and 2H are formed symmetrically with respect to a virtual straight line (not shown) extending in the vertical direction X by dividing the diaper 1 into the horizontal direction Y. ing. The two regions 2L and 2H having different rigidity are preferably formed in at least the crotch 1M in the longitudinal direction X, and extend from the crotch 1M to one or both of the ventral side 1F and the back side 1R. It is preferable that it is formed, or it covers the full length of the absorber 4, and also it covers the full length of the diaper 1 in the vertical direction X like this embodiment.

  In FIG. 3, the skin facing surface of the top sheet 2 is shown enlarged. As shown in FIG.2 and FIG.3, the surface sheet 2 has the convex part 26 which protrudes toward a wearer's skin side, and the recessed part 25 which exists in the circumference | surroundings of the convex part 26, and the surface material low-rigidity area | region 2L. And the surface material high-rigidity region 2H have different formation patterns of the convex portions 26 and / or the recesses 25, the difference between the unevenness formation patterns is that the surface material low-rigidity region 2L and the surface material high-rigidity region 2H are different. This is one of the causes of the rigidity difference.

  In the present specification, the expression “difference in the formation pattern of the convex portions” includes both cases where only the arrangement of the convex portions is different, cases where the shapes of the convex portions are different, and cases where both are different. The aspect in which the arrangement of the convex portions is different includes a case where the distance between the convex portions is different. Moreover, the aspect from which the form of a convex part differs also includes the case where the planar view shape of a convex part differs. In the diaper 1 of this embodiment, as will be described later, the arrangement and form of the protrusions 26 are different between the surface material low-rigidity region 2L and the surface material high-rigidity region 2H. Further, the meaning of the expression “difference pattern of the recesses is different” is substantially the same as the expression “difference of the formation pattern of the protrusions”, and the description of the protrusions is appropriately applied.

  The surface sheet 2 is formed by partially performing known embossing on the raw sheet that is the raw material, and the embossed portion is formed by the material of the raw sheet being consolidated. The part which is formed into the concave part 25 and is not embossed protrudes to one side in the thickness direction, specifically the skin-facing surface side, and becomes the convex part 26, and the concave part 25 depends on the presence or absence of such embossing. Is a high density portion having a relatively high density, and the convex portion 26 is a low density portion having a relatively low density. In the surface sheet 2, the region where the proportion of the concave portions 25 is large (the proportion of the convex portions 26 is small) is usually harder and more difficult to bend.

  As described above, since there is a density difference between the concave portion 25 and the convex portion 26, “the formation pattern of the concave portion 25”, for example, the shape of the concave portion in plan view, the area (embossed area), the position, etc. Both the “pattern”, for example, the shape, size, position, and the like of the convex portion 26 affect the rigidity of the topsheet 2. For example, even if the formation positions of the plurality of convex portions 26 are the same between the two areas to be compared in the surface sheet 2, if the area ratio of the concave portions 25 is different, the area ratio of the concave portions 25 is relatively large Can be the surface material high-rigidity region 2H. In addition, even if the area ratio of the concave portion 25 is the same between the two regions to be compared, if the formation position of the convex portion 26 is different, a difference in rigidity occurs between the two regions, and the surface material low-rigidity region 2L And the surface material high rigidity region 2H may occur. Accordingly, in order to form a difference in rigidity between one part and the other part in one surface sheet 2 to form the surface material low rigidity region 2L and the surface material high rigidity region 2H, these one part and the other It is effective to make one or both of the formation pattern of the concave portion 25 and the formation pattern of the convex portion 26 different from each other.

  About the rigidity of each part of a surface sheet (surface material), it can evaluate by the bending rigidity measured by the following method. It can be evaluated that the smaller the measured value of the bending stiffness, the lower the rigidity of the measurement object, and the easier it is to bend.

<Measurement method of bending rigidity of surface sheet>
According to the ring crush method JIS P8126. Specifically, a predetermined measurement target part is cut out from the surface sheet to obtain a measurement sample. For example, from each of the surface material low-rigidity region 2L and the surface material high-rigidity region 2H of the surface sheet 2, a rectangular shape portion having a length of 30 mm in the vertical direction X and a length of 110 mm in the horizontal direction Y is cut out to obtain a test piece. The test piece is rounded into a cylindrical shape in the longitudinal direction of the test piece with the skin-facing surface of the test piece facing outward, and one end and the other end in the longitudinal direction of the test piece are fastened with an ultrasonic seal, A 30 mm cylindrical measurement sample is prepared. The produced cylindrical measurement sample is set up so that its axial direction coincides with the vertical direction, and the measurement sample is compressed in the axial direction from its upper end side at a compression speed of 10 mm / min using a compression tester. Record the maximum load shown at times. Five measurement samples are prepared for each measurement target part, and each maximum load is measured, and the average value thereof is bent in the measurement target part (for example, the surface material low rigidity region 2L or the surface material high rigidity region 2H). The stiffness value.

The ratio of the bending rigidity of the surface material high rigidity region 2H to the bending rigidity of the surface material low rigidity region 2L is preferably 1.1 or more, more preferably 1.2 or more as the latter / the former.
On the premise that the bending rigidity of the surface material high rigidity region 2H is larger than the bending rigidity of the surface material low rigidity region 2L, it is preferably 10 cN or more, more preferably 15 cN or more, and preferably 50 cN or less, more preferably 40 cN. Or less, preferably 10 cN or more and 50 cN or less, more preferably 15 cN or more and 40 cN or less.
On the assumption that the bending rigidity of the surface material low rigidity region 2L is smaller than that of the surface material high rigidity region 2H, it is preferably 40 cN or less, more preferably 30 cN or less, and preferably 5 cN or more, more preferably 10 cN. Or more, preferably 5 cN or more and 40 cN or less, more preferably 10 cN or more and 30 cN or less.

  4 shows an enlarged part of the surface material low-rigidity region 2L of the surface sheet 2, and FIG. 5 shows an enlarged part of the surface material high-rigidity region 2H of the surface sheet 2. Has been. The top sheet 2 in the diaper 1 of the present embodiment is a composite sheet composed of a laminate of two sheets 20 and 21. In the surface sheet 2, the laminated first sheet 20 and second sheet 21 are partially bonded by embossing in both the regions 2 </ b> L and 2 </ b> H, and a plurality of bonded portions, that is, recessed portions 25 (high density portions) are formed. The 1st sheet | seat 20 is formed, protrudes in the direction away from the 2nd sheet | seat 21 in site | parts other than the recessed part 25, and forms the convex part 26 (low-density part) which protrudes toward a wearer's skin side. Yes. In the recess 25, the two sheets 20, 21 are pressed together by embossing, and preferably, the heat between the sheets 20, 21 is caused by melting of the constituent resin of one or both sheets and subsequent solidification. Fused. The surface sheet 2 has a substantially flat surface on the second sheet 21 side in both the regions 2L and 2H, and has a large undulation on the first sheet 20 side.

The first sheet 20 and the second sheet 21 are made of a sheet material. As the sheet material, for example, a non-woven fabric such as an air-through nonwoven fabric or a spunbond nonwoven fabric, a fiber sheet such as a woven fabric, a knitted fabric, a film or the like can be used, and it is preferable to use a fiber sheet from the viewpoint of touch, In particular, it is preferable to use a nonwoven fabric. The types of sheet materials constituting both sheets 20 and 21 may be the same or different. The basis weight of the nonwoven fabric used as the sheet material constituting both sheets 20 and 21 is preferably 10 g / m ² or more, more preferably 15 g / m ² or more, and preferably 40 g / m ² or less, more preferably 35 g / m. m ² or less.

  In the surface material low rigidity region 2L and the surface material high rigidity region 2H, the main difference regarding the formation pattern of the convex portion 26 is that the surface material low rigidity region 2L includes the convex portion 26 as shown in FIGS. As the (low density portion), the plurality of small convex portions 27A and 27B have the continuous convex portion 27 having a shape continuous in the lateral direction Y, whereas the surface material high rigidity region 2H has such a continuous convex shape. The convex part 26 has a point in which a plurality of convex parts 26H exist independently.

  In the surface material low-rigidity region 2L, as shown in FIGS. 2 to 4, a plurality of continuous convex portions 27 extending continuously in the horizontal direction Y are formed at predetermined intervals in the vertical direction X. The continuous convex portion 27 is formed by connecting a plurality of small convex portions 27A and 27B to each other. In this specification, “a convex portion is connected” means that two adjacent convex portions (small convex portions) are not separated by the concave portion 25 (joint portion), and a part of one convex portion. Is a part of the other convex part, and a part of the other convex part is a part of the one convex part.

  The presence of the continuous convex portion 27 extending continuously in the lateral direction Y greatly contributes to maintaining the three-dimensional structure of the topsheet 2 while the diaper 1 is worn. That is, while the diaper 1 is being worn, particularly in the crotch 1M, the outer sheet is compressed by applying external force from both sides in the lateral direction Y by the wearer's thigh. There is a concern that the three-dimensional structure composed of the two concave portions 25 (high-density portion) and the convex portions 26 (low-density portion) is crushed, and the effects that can be originally achieved by such a three-dimensional structure are not achieved. For example, in the case where a continuous convex portion (not shown) extending in the longitudinal direction X is formed on the topsheet 2, that is, a continuous convex portion extending in a direction extending 90 ° from the continuous convex portion 27, the continuous convex portion is When compressed from the lateral direction Y, the plurality of small convex portions constituting the continuous convex portion are respectively compressed in the horizontal direction Y, and therefore the degree of deformation due to compression of the continuous convex portion as a whole is relatively large. Become. On the other hand, since the continuous convex part 27 is extended in the horizontal direction Y which is easy to be compressed during wearing of the diaper 1, even if it is compressed by an external force applied from both outsides in the horizontal direction Y, the continuous convex part 27 is not easily crushed. Easy to maintain. Accordingly, the continuous convex portion 27 extending continuously in the lateral direction Y is formed on the top sheet 2 so that the texture inherent to the top sheet 2 is easily maintained, and the skin contact with the wearer's crotch, liquid leakage, etc. In this respect, improvement in performance can be expected.

In the present embodiment, the continuous convex portion 27 is formed by alternately connecting two types of small convex portions 27A and 27B having different heights in the horizontal direction Y, as shown in FIGS. The small convex portion 27A has a relatively high height, and the small convex portion 27B has a relatively low height. Both the convex portions 27A and 27B have a substantially circular shape in plan view, and have a shape having a top portion in a cross section in any of the vertical direction X and the horizontal direction Y. The continuous convex portion 27 is hollow, and the hollow portion continuously extends over substantially the entire length in the lateral direction Y of the continuous convex portion 27.
In addition, in this embodiment, although the continuous convex part 27 is continuing over the full length of the horizontal direction Y of 2 L of surface material low rigidity area | regions, the form of the continuous convex part 27 is not limited to this. For example, a plurality of continuous convex portions 27 are linearly arranged in a row at a predetermined interval in the lateral direction Y, and the convex portion row composed of the plurality of continuous convex portions 27 extends across the surface material low-rigidity region 2L. It may be made to cross in the direction Y.

  As shown in FIGS. 3 and 4, the surface material low-rigidity region 2 </ b> L is a convex portion 26 (low-density portion), and in addition to the continuous convex portion 27, the periphery is a concave portion 25 (high-density portion), that is, the sheets 20, 21. A plurality of convex portions 26 </ b> L surrounded by the joint portions. Each convex portion 26L is formed in a region surrounded by a total of six concave portions 25, and has a shape having a top portion in the cross section in any of the vertical direction X and the horizontal direction Y. Each convex portion 26 </ b> L is lower in height than the small convex portions 27 </ b> A (small convex portions having a relatively high height) constituting the continuous convex portion 27. In addition, in this embodiment, although each convex part 26L is hollow, the solid structure with which the formation material of the surface sheet 2 was filled inside may be sufficient instead of a hollow structure.

  In the surface material low-rigidity region 2L, as shown in FIGS. 3 and 4, a plurality of convex portions 26L are linearly arranged in a row at predetermined intervals in the lateral direction Y to form the convex portion rows. It is composed. A plurality of small convex portions 27B (small convex portions having relatively low heights) constituting the continuous convex portion 27 are arranged in a straight line at predetermined intervals in the lateral direction Y. A convex row is formed. And the convex part row | line | column by the some convex part 26L and the continuous convex part 27 are arrange | positioned alternately and linearly along the vertical direction X, and one convex part 26L and one small convex part 27B are provided. Are formed at the same position in the lateral direction Y.

  As shown in FIGS. 2, 3, and 5, the surface material high-rigidity region 2 </ b> H has a plurality of convex portions 26 </ b> H surrounded by concave portions 25 (high-density portions), that is, joint portions of the sheets 20 and 21. Yes. Each convex portion 26 </ b> H is formed in a region surrounded by a total of six concave portions 25, and has a shape having a top portion in a cross section in any of the vertical direction X and the horizontal direction Y. Each convex portion 26 </ b> H is lower in height than the small convex portions 27 </ b> A (small convex portions having a relatively high height) constituting the continuous convex portion 27. In addition, in this embodiment, although each convex part 26H is hollow, not a hollow structure but the solid structure with which the formation material of the surface sheet 2 was filled inside may be sufficient.

  In the surface material high-rigidity region 2H, as shown in FIGS. 3 and 5, the convex portions 26H are formed in the form of scattered dots in a plan view, more specifically in a zigzag shape. That is, in the surface material high-rigidity region 2H, a plurality of convex portions rows in which a plurality of convex portions 26H are linearly arranged at predetermined intervals in the horizontal direction Y are arranged in a plurality of rows in the vertical direction X. In the lateral direction Y, the convex portions 26H are shifted from each other between the adjacent convex portion rows. In other words, in the surface material high-rigidity region 2H, a plurality of convex portions rows in which a plurality of convex portions 26H are linearly arranged at predetermined intervals in the vertical direction X are respectively expressed in the vertical direction X. Between the projected images of the respective convex portions 26H in the specific convex portion row (for example, an intermediate position between two convex portions 26H and 26H adjacent to each other in the specific convex portion row). In addition, the plurality of convex portions 26H are arranged in a staggered manner so that the projected images of the convex portions 26H in another convex portion row adjacent to the specific convex portion row in the lateral direction Y are arranged.

  The surface sheet 2 having the above-described configuration can be manufactured, for example, according to the method for manufacturing a composite sheet described in JP-A-2015-112343. Specifically, for example, the belt-shaped first sheet 20 is supplied between a first roll and a second roll whose peripheral surfaces are in mesh with each other, and the first sheet 20 is deformed into an uneven shape. Thereafter, the first sheet 20 is moved from the meshing portion along the peripheral surface portion of the first roll, and then the second sheet 21 is supplied so as to be superimposed on the first sheet 20, so that both sheets 20, 21 are Between the convex part and the heat roll in one roll, it is sandwiched by heating and partially joined. At that time, the concave and convex shapes of the first roll and the second roll at the central part and the side part of the first sheet 20. And the pattern of the joint formed by the first roll and the heat roll are made different. When the first sheet 20 is deformed into a concavo-convex shape by being engaged with the meshing portion of the first roll and the second roll, the first sheet 20 is sucked toward the inside of the roll, and the first sheet 20 It is preferable to promote the deformation to the uneven shape.

  As one of the main features of the diaper 1 of the present embodiment, as shown in FIGS. 1 and 2, the surface material 2 has a surface material low-rigidity region that extends in the longitudinal direction X so as to overlap the core low-rigidity region 40 </ b> L in plan view. 2L and the surface material high rigidity region 2H located on both sides in the lateral direction Y, and the surface material high rigidity region 2H and the core high rigidity region 40H overlap in plan view. That is, in the diaper 1, the surface material low-rigidity region 2 </ b> L having relatively low rigidity in the topsheet 2 and the core low-rigidity region 40 </ b> L having relatively low rigidity in the absorbent core 40 are formed in the lateral direction Y of the diaper 1. In the center portion of the surface sheet 2, a surface material high rigidity region 2H having relatively high rigidity in the top sheet 2, and a core high rigidity region 40H having relatively high rigidity in the absorbent core 40, The diaper 1 is overlapped in the thickness direction on both sides in the lateral direction Y. That is, when the surface material high rigidity region 2H is projected in the thickness direction of the diaper 1, at least a part of the region 2H overlaps with the core high rigidity region 40H, and the surface material low rigidity region 2L of the diaper 1 When projected in the thickness direction, at least a part of the region 2L overlaps the core low-rigidity region 40L.

  In the diaper 1, as will be described later, the boundary between the core low-rigidity region 40L and the core high-rigidity region 40H (a pair of grooves 41, 41 located on the outermost side in the lateral direction Y) extends over the entire length in plan view. Since it overlaps the boundary 28 between the surface material low rigidity region 2L and the surface material high rigidity region 2H, the surface material low rigidity region 2L and the core low rigidity region 40L generally overlap in plan view (FIG. 1 and FIG. 1). (See FIG. 2). Further, as described above, since both side edges 2S, 2S of the surface sheet 2 coincide with both side edges along the longitudinal direction X in the maximum width portion of the absorbent core 40, the entire core high rigidity region 40H is the surface material. It overlaps with the high rigidity region 2H in plan view.

  As described above, the central portion in the lateral direction Y of the diaper 1 (particularly the central portion in the lateral direction Y of the absorbent core 40) where the surface material low-rigidity region 2L and the core low-rigidity region 40L overlap each other is relatively Both sides of the central portion (particularly both sides of the absorbent core 40 in the lateral direction Y) where the surface material high rigidity region 2H and the core high rigidity region 40H are overlapped are relatively high. When the diaper 1 is rigid, the center part is crushed and deformed relatively greatly when compressed by the wearer's thigh from both sides in the lateral direction Y, while Since it is hard to be crushed and the degree of deformation is relatively small, the three-dimensional structure inherent to the high-rigidity region 2H of the surface material 2 of the topsheet 2 and the high-rigidity region 40H of the absorbent core 40 existing on both sides is easily maintained. Thus, while the diaper 1 is worn, the three-dimensional structure of both sides in the lateral direction Y is maintained without being substantially crushed, so that the skin contact of the crotch 1M is improved and the wearer excretes. Leakage is effectively prevented because so-called liquid jumping, in which excretion liquid such as urine excreted from the part to the crotch part 1M scatters to an unexpected part, is suppressed.

  From the viewpoint of more surely exhibiting the operational effect due to the overlap between the surface material high rigidity region 2H and the core high rigidity region 40H (the overlap between the surface material low rigidity region 2L and the core low rigidity region 40L). The ratio of the area of the overlapping portion with the one in the surface material high-rigidity region 2H that overlaps one of the total area of one of the pair of core high-rigidity regions 40H and 40H is preferably 50% or more, Preferably it is 70% or more. From the same viewpoint, the ratio of the area of the overlapping portion with the surface material low-rigidity region 2L in the total area of the core low-rigidity region 40L is preferably 60% or more, and more preferably 80% or more. In the diaper 1 of the present embodiment, all the ratios are 100%.

  In particular, in the diaper 1 of the present embodiment, as described above, the continuous convex portion 27 extending continuously in the lateral direction Y is formed in the surface material low-rigidity region 2L existing in the central portion of the diaper 1 in the lateral direction Y. Therefore, although the surface material low-rigidity region 2L is easily compressed during wearing of the diaper 1 due to the influence of the core low-rigidity region 40L that overlaps the surface material low-rigidity region 2L in the thickness direction, the surface material low-rigidity region 2L originally has The three-dimensional structure is easily maintained. Therefore, the texture inherent to the top sheet 2 is easily maintained, and further improvement in performance can be expected in terms of skin contact with the wearer's crotch, leakage, and the like.

  From the viewpoint of making the effects of the surface sheet 2 and the absorbent core 40 more reliable as described above, the core low rigidity region 40L occupying the entire area of the skin facing surface 40a of the absorbent core 40. The ratio of the area of the skin facing surface 40a in the (block structure forming region) is preferably 20% or more, more preferably 30% or more, and preferably 70% or less, more preferably 60% or less.

  In the diaper 1 of the present embodiment, as shown in FIG. 3, a plurality of convex portions 26 (26L, 27) are intermittently formed in the longitudinal direction X at a predetermined pitch P1 in the surface material low-rigidity region 2L. At the same time, as shown in FIG. 1, a plurality of grooves 41, that is, low basis weight portions 42 are intermittently formed in the longitudinal direction X at a predetermined pitch P2 in the core low rigidity region 40L. From the viewpoint of improving the fit, the ratio of the pitch P2 to the pitch P1 is preferably 2 or more, more preferably 3 or more, and preferably 7 or less, more preferably 6 or less, as pitch P2 / pitch P1. .

  Moreover, from the viewpoint of making the above-described operation and effect of the continuous convex portion 27 more reliable, the pitch P3 (see FIG. 3) of the continuous convex portion 27 is preferably 3 mm or more, and more preferably 4 mm. Above, and preferably 9 mm or less, more preferably 8 mm or less.

  Further, in the diaper 1 of the present embodiment, a pair of grooves 41, 41 located at the outermost boundary Y in the lateral direction Y between the core low rigidity region 40L and the core high rigidity region 40H in a plan view as shown in FIG. ) Overlaps the boundary 28 between the surface material low-rigidity region 2L and the surface material high-rigidity region 2H. That is, when the groove 41 that forms the boundary between the region 40L and the region 40H in the absorbent core 40 is projected in the thickness direction of the diaper 1, at least a part of the groove 41 includes the region 2L and the region 2H in the topsheet 2. It overlaps with the boundary 28. In the diaper 1, the groove | channel 41 and the boundary 28 have overlapped over those full length. With such a configuration, when the diaper 1 is worn and compressed from the outside in the lateral direction Y by the wearer's thigh, a bent portion is easily formed at the overlapping portion of both the boundaries 28 and 41, thereby The three-dimensional structure of the constituent members (surface material high rigidity region 2H, core high rigidity region 40H) existing on both sides in the lateral direction Y of the diaper 1 is easily maintained, and the central portion (surface material low) of the diaper 1 in the horizontal direction Y is easily maintained. The rigid region 2L and the core low-rigid region 40L) are easily bent and deformed.

  In the diaper 1 of the present embodiment, the boundary 28 between the surface material low-rigidity region 2L and the surface material high-rigidity region 2H in the topsheet 2, and the core low-rigidity region 40L and the core high-rigidity region 40H in the absorbent core 40. And the boundary (a pair of grooves 41 and 41 located at the outermost side in the lateral direction Y) overlaps the entire length of both the boundaries 28 and 41, but as in the other embodiments shown in FIG. The boundary 28 in the sheet 2 and the boundary in the absorbent core 40 (the outermost groove 41 in the lateral direction Y) may partially overlap. FIG. 6 shows an absorbent core 40A in another embodiment of the absorbent article of the present invention. In addition, about other embodiment shown in FIG. 6, the structure part different from the diaper 1 mentioned above is mainly demonstrated, the same structure part attaches | subjects the same code | symbol, and abbreviate | omits description. The description of the diaper 1 is appropriately applied to components that are not particularly described in the other embodiment shown in FIG.

  In the other embodiment shown in FIG. 6, the dotted line indicated by reference numeral 28 is a boundary between the surface material low-rigidity region 2L and the surface material high-rigidity region 2H (not shown), and is the vertical direction over the entire length in the vertical direction X of the absorbent core 40A. X extends. As shown in FIG. 6, in the ventral side portion 1F and the dorsal side portion 1R, the boundary between the core low-rigidity region 40L and the core high-rigidity region 40H, that is, the most in the lateral direction Y in the ventral side portion 1F and the dorsal side portion 1R. A pair of grooves 41, 41 located outward are located outward in the lateral direction Y from the boundary 28 between the surface material low rigidity region 2L and the surface material high rigidity region 2H. A pair of grooves 41, 41 positioned at the outermost side in the lateral direction Y at the boundary between the region 40 </ b> L and the core high-rigidity region 40 </ b> H, i. doing. The effect similar to the diaper 1 mentioned above is show | played also by other embodiment shown in FIG.

  Although the present invention has been described above, the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention. For example, in order to prevent the excretion fluid from transferring from the absorbent core 40 to the wearer's skin (so-called liquid return), a sub-layer or the like is provided between the topsheet 2 and the absorbent body 4 (core wrap sheet 45). A fluid-permeable bodily fluid backflow prevention layer, also called a liquid-permeable body fluid, may be interposed. Moreover, although the surface sheet 2 in the said embodiment was comprised from the laminated body of the two sheets 20 and 21, you may be comprised from one sheet.

  The absorbent article of the present invention is not limited to the deployable disposable diaper as in the above-described embodiment, and widely includes articles used for absorbing bodily fluids (urine, menstrual blood, loose stool, sweat, etc.) discharged from the human body. Also included are pants-type disposable diapers, sanitary napkins, sanitary shorts, and the like. The following additional notes are disclosed with respect to the embodiment of the present invention described above.

<1>
An absorbent body having an absorbent core containing an absorbent material, and a surface material disposed on the skin-facing surface side of the absorbent body, and a transverse direction perpendicular to the longitudinal direction corresponding to the wearer's front-rear direction. An absorbent article having a direction,
The absorbent body is located in a laterally central portion of the absorbent core and extends in the longitudinal direction, and is located on both lateral sides of the core low stiffness area and compared to the core low stiffness area. Having a highly rigid core high rigidity region,
The surface material is positioned on both sides in the lateral direction of the surface material low-rigidity region and overlaps with the core low-rigidity region in a plan view, as compared with the surface material low-rigidity region. The absorbent article has a highly rigid surface material high rigidity region, and the surface material high rigidity region and the core high rigidity region overlap in plan view.
<2>
The absorbent core according to <1>, wherein the core low-rigidity region has a lower basis weight than the core high-rigidity region.
<3>
The core high-rigidity area is an area other than the core low-rigidity area in the absorbent core, and the absorbent article according to <1> or <2>, which surrounds the core low-rigidity area.

<4>
Grooves are formed on the skin-facing surface or non-skin-facing surface of the core low-rigidity region, and the groove-forming portion has a lower basis weight than the groove-non-forming portion of the core low-rigidity region. The absorbent article as described in 2> or <3>.
<5>
It has the abdominal side arranged on the abdomen side of the wearer and the dorsal side part arranged on the dorsal side and the crotch part located between them in the vertical direction,
The core low-rigidity region is a region in which a plurality of linear grooves are formed in a lattice shape in plan view, and extends from the ventral side portion to the dorsal side portion according to <4>. Absorbent article.
<6>
The core low-rigidity region has a shorter length in the longitudinal direction than the absorbent core, and the pair of grooves positioned at the outermost sides in the longitudinal direction are longer than the longitudinal front and rear ends of the absorbent core. The absorbent article according to <4> or <5>, which is located inward.
<7>
<4> The lateral length of the core low-rigidity region, that is, the length between the pair of grooves located at the outermost sides in the lateral direction is constant over the entire length in the vertical direction of the core low-rigidity region. The absorbent article as described in any one of-<6>.

<8>
The core low-rigidity region has a relatively high basis weight and a high basis weight portion having a convex shape protruding toward the non-skin facing surface side, and is adjacent to the high basis weight portion and relatively has a basis weight. Has a low basis weight part that is recessed toward the skin facing surface side,
The said groove | channel is an absorptive article as described in any one of said <4>-<7> which is a recessed part formed in the non-skin opposing surface side in the formation position of the said low basic weight part.
<9>
In the core low rigidity region, the non-skin facing surface has a concavo-convex structure due to the presence of the plurality of grooves, whereas the skin facing surface does not have the grooves and is flat <8>. Absorbent article as described in 1.
<10>
In the core low-rigidity region, a plurality of linear grooves extend in the vertical direction, and a plurality of linear grooves extend in the horizontal direction. The absorbent article according to <8> or <9>, wherein the core low-rigidity region is partitioned into a plurality of small regions by the groove-like grooves, and the small region is the high basis weight portion.
<11>
Each said high basic weight part is divided by the said low basic weight part, The absorbent article as described in any one of said <8>-<10> which is independent independently.

<12>
The ratio of the basis weight of the low basis weight part to the basis weight of the high basis weight part is preferably 20% or more, more preferably 30% or more, and preferably 80% or less, more preferably as the latter / the former. The absorbent article according to any one of <8> to <11>, which is 70% or less.
<13>
The basis weight of the low basis weight part is preferably 100 g / m ² or more, more preferably 150 g / m ² or more, and preferably 500 g / m ² or less, more preferably 400 g / m ² or less <8 The absorbent article according to any one of> to <12>.
<14>
The basis weight of the high basis weight part is preferably 300 g / m ² or more, more preferably 350 g / m ² or more, and preferably 900 g / m ² or less, more preferably 800 g / m ² or less <8 The absorbent article according to any one of> to <13>.
<15>
The high basis weight part is thicker than the low basis weight part, and the ratio of the thickness of the low basis weight part to the thickness of the high basis weight part is preferably 30% or more as the latter / the former. The absorbent article according to any one of <8> to <14>, more preferably 40% or more, and preferably 90% or less, and more preferably 80% or less.
<16>
The thickness of the low basis weight part is preferably 1.5 mm or more, more preferably 2.5 mm or more, and preferably 4.5 mm or less, more preferably 4 mm or less, any of <8> to <15> An absorbent article according to any one of the above.
<17>
The thickness of the high basis weight part is preferably 2 mm or more, more preferably 3 mm or more, and preferably 8 mm or less, more preferably 7 mm or less, according to any one of <8> to <16>. Absorbent article.
<18>
The thickness of the core high-rigidity region is the absorbent article according to any one of <8> to <17>, wherein the thickness of the high basis weight part of the core low-rigidity region is substantially the same.

<19>
The bending rigidity of the core low-rigidity region is preferably 3 g or more, more preferably 4 g or more, and preferably 10 g or less, more preferably 9 g or less, according to any one of <1> to <18>. Absorbent articles.
<20>
The bending rigidity of the core high rigidity region is preferably 5 g or more, more preferably 6 g or more, and preferably 20 g or less, more preferably 15 g or less, according to any one of <1> to <19>. Absorbent articles.
<21>
The absorbent article according to any one of <1> to <20>, wherein a difference in bending rigidity between the core low rigidity region and the core high rigidity region is 1 g or more.

<22>
The surface material has a convex portion protruding toward the wearer's skin side and a concave portion existing around the convex portion, and the convex portion and the surface material low-rigidity region and the surface material high-rigidity region / Or the absorbent article as described in any one of said <4>-<21> from which the formation pattern of this recessed part differs.
<23>
The absorbent article according to <22>, wherein the concave portion is a high-density portion that has been embossed, and the convex portion is a low-density portion that has not been embossed.
<24>
The absorbent article according to <22> or <23>, wherein in the surface material high-rigidity region, the convex portion is formed in a dotted shape, more specifically, a staggered shape.

<25>
The absorbent article according to any one of <22> to <24>, wherein the surface material low-rigidity region includes a continuous convex portion having a shape in which a plurality of convex portions are arranged in a lateral direction as the convex portion.
<26>
The absorbent article according to <25>, wherein the surface material high-rigidity region does not have the continuous convex portion, and the surface material high-rigidity region includes a plurality of the convex portions independently.
<27>
The absorbent article according to <25> or <26>, wherein the continuous convex portion is hollow, and the hollow portion continuously extends over substantially the entire length in the lateral direction of the continuous convex portion.
<28>
The said continuous convex part is an absorbent article as described in any one of said <25>-<27> in which two types of small convex parts from which height differs are connected alternately in the horizontal direction.
<29>
In the surface material low-rigidity region, a plurality of convex portions arranged by the convex portions and the continuous convex portions are alternately and linearly arranged along the vertical direction, and one convex portion and one convex portion are arranged. The absorbent article according to <28>, wherein the small convex portions are formed at the same position in the lateral direction.
<30>
The absorption according to any one of <25> to <29>, wherein the pitch of the continuous convex portions is preferably 3 mm or more, more preferably 4 mm or more, and preferably 9 mm or less, more preferably 8 mm or less. Sex goods.
<31>
In the surface material low rigidity region, the plurality of convex portions are intermittently formed in the vertical direction at a predetermined pitch P1, and in the core low rigidity region, the plurality of grooves are intermittent in the vertical direction at a predetermined pitch P2. The ratio of the pitch P2 to the pitch P1 is preferably 2 or more, more preferably 3 or more, and preferably 7 or less, more preferably 6 or less, as the ratio of pitch P2 / pitch P1. The absorbent article as described in any one of 22>-<30>.

<32>
The ratio of the bending rigidity of the surface material high rigidity region to the bending rigidity of the surface material low rigidity region is preferably 1.1 or more, more preferably 1.2 or more, as the latter / the former. 31> The absorbent article as described in any one of 31.
<33>
On the assumption that the bending rigidity of the surface material high rigidity region is larger than the bending rigidity of the surface material low rigidity region, it is preferably 10 cN or more, more preferably 15 cN or more, and preferably 50 cN or less, more preferably 40 cN. The absorbent article according to any one of <1> to <32>, which is the following.
<34>
On the assumption that the bending rigidity of the surface material low rigidity region is smaller than the bending rigidity of the surface material high rigidity region, it is preferably 40 cN or less, more preferably 30 cN or less, and preferably 5 cN or more, more preferably 10 cN. The absorbent article according to any one of the above items <1> to <33>.

<35>
The ratio of the area of the skin facing surface of the core low-rigidity region to the total area of the skin facing surface of the absorbent core is preferably 20% or more, more preferably 30% or more, and preferably 70% or less, The absorbent article according to any one of <1> to <34>, more preferably 60% or less.
<36>
In plan view, any one of <1> to <35>, wherein a boundary between the core low-rigidity region and the core high-rigidity region overlaps a boundary between the surface material low-rigidity region and the surface material high-rigidity region. Absorbent article according to item.
<37>
It has the abdominal side arranged on the abdomen side of the wearer and the dorsal side part arranged on the dorsal side and the crotch part located between them in the vertical direction,
In the ventral part and the dorsal part, the boundary between the core low rigidity region and the core high rigidity region is located laterally outward from the boundary between the surface material low rigidity region and the surface material high rigidity region. And
In the crotch part, the boundary between the core low-rigidity region and the core high-rigidity region is located inward in the lateral direction from the boundary between the surface material low-rigidity region and the surface material high-rigidity region. The absorbent article as described in any one of 1>-<36>.
<38>
The absorbent article according to any one of <1> to <37>, wherein the absorbent core has a single-layer structure and has an hourglass shape in which a central portion in a longitudinal direction is bound inward in a plan view.

1 disposable diaper (absorbent article)
1F Abdominal side 1M Crotch 1R Back side 2 Top sheet 2L Surface material low rigidity area 2H Surface material high rigidity area 20 1st sheet 21 2nd sheet 25 Concave part (high density part, joint part)
26, 26L, 26H Convex part (low density part)
27 Continuous convex part (low density part)
27A, 27B Small convex part (low density part)
28 Boundary between surface material low rigidity region and surface material high rigidity region 3 Back sheet 4 Absorber 40, 40A Absorbent core 40L Core low rigidity region 40H Core high rigidity region 41 Groove 42 Low basis weight portion (groove forming part)
43 High Basis Weight Section 45 Core Wrap Sheet 5 Side Sheet 6 Fastening Tape 7 Sticking Area X Longitudinal Direction Y Lateral Direction

Claims (9)

An absorbent body having an absorbent core containing an absorbent material, and a surface material disposed on the skin-facing surface side of the absorbent body, and a transverse direction perpendicular to the longitudinal direction corresponding to the wearer's front-rear direction. An absorbent article having a direction,
The absorbent body is located in a laterally central portion of the absorbent core and extends in the longitudinal direction, and is located on both lateral sides of the core low stiffness area and compared to the core low stiffness area. Having a highly rigid core high rigidity region,
The surface material is positioned on both sides in the lateral direction of the surface material low-rigidity region and overlaps with the core low-rigidity region in a plan view, as compared with the surface material low-rigidity region. The absorbent article has a highly rigid surface material high rigidity region, and the surface material high rigidity region and the core high rigidity region overlap in plan view.   The absorbent core according to claim 1, wherein the core low-rigidity area has a lower basis weight than the core high-rigidity area.   A groove is formed in a skin facing surface or a non-skin facing surface of the core low-rigidity region, and a portion where the groove is formed has a lower basis weight than a portion where the groove is not formed in the core low-rigidity region. 2. The absorbent article according to 2.   The surface material has a convex portion protruding toward the wearer's skin side and a concave portion existing around the convex portion, and the convex portion and the surface material low-rigidity region and the surface material high-rigidity region The absorbent article according to claim 3, wherein the formation pattern of the recesses is different.   The absorbent article according to claim 4, wherein the surface material low-rigidity region has a continuous convex portion having a shape in which a plurality of convex portions are arranged in a lateral direction as the convex portion.   In the surface material low rigidity region, the plurality of convex portions are intermittently formed in the vertical direction at a predetermined pitch P1, and in the core low rigidity region, the plurality of grooves are intermittent in the vertical direction at a predetermined pitch P2. The absorbent article according to claim 4 or 5, wherein a ratio of pitch P2 to pitch P1 is 2 or more and 7 or less as pitch P2 / pitch P1.   The absorbent article as described in any one of Claims 1-6 whose ratio of the area of the skin opposing surface of the said core low rigidity area | region which occupies for the whole area of the skin opposing surface of the said absorbent core is 20% or more.   8. The plan view according to claim 1, wherein a boundary between the core low-rigidity region and the core high-rigidity region overlaps a boundary between the surface material low-rigidity region and the surface material high-rigidity region in a plan view. Absorbent articles. It has the abdominal side arranged on the abdomen side of the wearer and the dorsal side part arranged on the dorsal side and the crotch part located between them in the vertical direction,
In the ventral part and the dorsal part, the boundary between the core low rigidity region and the core high rigidity region is located laterally outward from the boundary between the surface material low rigidity region and the surface material high rigidity region. And
In the crotch part, a boundary between the core low-rigidity region and the core high-rigidity region is located inward in a lateral direction from a boundary between the surface material low-rigidity region and the surface material high-rigidity region. The absorbent article as described in any one of 1-7.

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