JP6050612B2 - Absorbent articles - Google Patents

Description

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

  DESCRIPTION OF RELATED ART Conventionally, the absorbent article using the block-shaped absorber (absorbent core) provided with the groove-shaped space extended in the plane direction is known (refer patent document 1). Since the absorbent article described in Patent Document 1 is composed of a nonwoven fabric with a thin topsheet, the groove-like space is extended linearly in the longitudinal direction intermittently in the transverse direction of the absorbent article, for example. If it does, it will become easy to curve to the transverse direction of an absorptive article.

  As a technique different from this, the present applicant has previously proposed an absorbent article using a sheet material having a relief structure as a top sheet (see Patent Document 2). Since the absorptive article given in patent documents 2 uses the surface sheet of the structure which has undulations, breathability improves and the touch improves.

JP 2009-119154 A JP 2009-153631 A

However, neither Patent Document 1 nor Patent Document 2 describes an absorbent article including a block-shaped absorbent body (absorbent core) and a surface sheet having a undulation structure. Describes appropriate arrangement of block-shaped absorber (absorbent core) and surface sheet with undulations to make use of the effect of surface sheet with undulations while utilizing the effect of absorbent cores) It has not been.
Therefore, the present invention relates to providing an absorbent article that can satisfy the aforementioned needs.

  The present invention is an absorbent article comprising a top sheet disposed on the skin facing surface side, a back sheet disposed on the non-skin facing surface side, and a vertically long absorbent disposed between the two sheets. The surface sheet has a large number of ridges raised on the skin-facing surface side and depressions adjacent to the ridge, and the skin-facing surface side of the surface sheet has a undulation, and the non-skin-facing surface The absorbent body has an absorbent core containing an absorbent polymer and a covering material that wraps the absorbent core, and the absorbent core has a relatively high basis weight and is on the back sheet side. And a high basis weight portion adjacent to the high basis weight portion, and a low basis weight portion having a relatively low basis weight and recessed from the back sheet side toward the top sheet side. Provided is an absorbent article in which the basis weight part and the low basis weight part are integrally formed and the skin facing surface side is flat. Than is.

  According to the absorbent article of the present invention, the bendability is improved, the air permeability is improved, and the touch is improved.

FIG. 1 is a partially broken plan view of an unfolded disposable diaper according to an embodiment of the present invention as viewed from the surface sheet side. FIG. 2 is a cross-sectional view taken along the line I-I in FIG. FIG. 3 is a perspective view of the top sheet of the disposable diaper shown in FIG. FIG. 4 is a plan view of the absorbent core of the disposable diaper shown in FIG. 1 as viewed from the back sheet side. FIG. 5 is a schematic view showing an example of an absorbent body manufacturing apparatus used for the deployable disposable diaper according to the embodiment of the present invention. 6 is a schematic cross-sectional view along the width direction of a part (concave portion) on the outer peripheral surface side of the rotating drum shown in FIG. FIG. 7 is a schematic cross-sectional view showing a state where an absorbent material is deposited in the concave portion of the rotating drum shown in FIG. FIG. 8 is an explanatory diagram for explaining a wearing state of the disposable diaper shown in FIG. 1, and (a) is a cross-sectional view taken along the line I-I when being convexly curved toward the topsheet 2 side. ) Is a cross-sectional view taken along line I-I when convexly curved toward the back sheet 3 side. FIG. 9 is an explanatory diagram for explaining a wearing state of the disposable diaper shown in FIG. 1, and is a cross-sectional view taken along line II when the wearer excretes and the absorbent body 4 expands during wearing. FIG. 10 is a perspective view of a top sheet used for a disposable diaper according to another embodiment of the present invention. FIG. 11: is the top view which looked at the absorptive core used for the disposable diaper which is another embodiment of this invention from the back surface sheet side. FIG. 12: is the top view which looked at the absorptive core used for the disposable diaper which is another embodiment of this invention from the back surface sheet side. FIG. 13: is the top view which looked at the absorptive core used for the disposable diaper which is another embodiment of this invention from the back surface sheet side. FIG. 14: is the top view which looked at the absorptive core used for the disposable diaper which is another embodiment of this invention from the back surface sheet side.

  Hereinafter, the absorbent article of this invention is demonstrated based on the preferable embodiment, referring FIGS. 1-4. FIG. 1 is a partially broken plan view of an unfolded disposable diaper according to an embodiment of the present invention as viewed from the surface sheet side, and FIG. 2 is a cross-sectional view taken along the line II of FIG. ing. 3 is a perspective view of the top sheet having the disposable diaper shown in FIG. 1, and FIG. 4 is a plan view of the absorbent core having the disposable diaper shown in FIG.

  As shown in FIG. 1, the disposable diaper 1 of the present embodiment (hereinafter also referred to as “diaper 1”) has a top sheet 2 disposed on the skin facing surface side and a back surface disposed on the non-skin facing surface side. A sheet 3 and a vertically long absorbent body 4 disposed between the sheets 2 and 3 are provided. As shown in FIG. 1, the diaper 1 is formed symmetrically with respect to a center line CL extending in the vertical direction.

The diaper 1 of the present embodiment will be described in detail. As shown in FIG. 1, the diaper 1 is in a vertical direction (hereinafter also referred to as “Y direction”. Y direction: a direction parallel to the center line CL). It has an abdominal side A, a back side B, and a crotch C positioned between these A and B. The abdomen A is a part located on the wearer's abdomen when the diaper is worn, the dorsal part B is a part located on the wearer's back, and the crotch C is located on the inseam of the wearer. It is a part to do. The crotch part C is located in the central part of the diaper 1 in the vertical direction (Y direction). In addition, the direction orthogonal to the vertical direction (Y direction) will be described as the horizontal direction of the diaper 1 (hereinafter also referred to as “X direction”).
In the present specification, the “skin facing surface” is a surface disposed on the skin side of the wearer when worn, out of the front and back surfaces of each member such as the surface sheet 2 constituting the diaper 1. The “surface” is a surface that is directed to the side opposite to the skin side of the wearer when wearing, out of the front and back surfaces of each member such as the surface sheet 2.

  As shown in FIG. 1, the diaper 1 has left and right side edges of the abdominal side A and left and right side edges of the back side B extending laterally (X direction) outward from the left and right side edges of the crotch C. ing. The left and right side edges of the crotch part C are curved in an arc shape inward in the lateral direction (X direction), and the central part in the longitudinal direction (Y direction) is constricted inward as a whole. Yes. The top sheet 2 and the back sheet 3 respectively extend outward from the left and right side edges and the front and rear end edges of the absorber 4. As shown in FIG. 2, the surface sheet 2 has a lateral dimension (X direction) smaller than a lateral dimension (X direction) of the back sheet 3. Each of the top sheet 2 and the back sheet 3 is joined to each other directly or through another member at the extended portion extending outward from the periphery of the absorbent body 4, and sandwiches and fixes the absorbent body 4. doing. The adhesive 5 for fixing the absorber 4 will be described in detail later.

  As shown in FIG. 1, the diaper 1 is a so-called unfolded diaper. A pair of fastening tapes 7 and 7 are provided on the left and right edges of the back side B, and the outer surface (non-skin) of the abdominal side A is provided. A landing tape 8 for fastening the fastening tapes 7 is provided on the opposing surface. As shown in FIG. 1, a three-dimensional gather forming sheet 62 having elastic members 61 fixed in an expanded state in the Y direction is provided on both side portions along the longitudinal direction (Y direction) of the diaper 1. A pair of three-dimensional gathers 6 and 6 (see FIG. 2) are formed by being arranged and fixed on the side portions. Moreover, as shown in FIG. 1, the leg elastic member 63 for leg gather formation is distribute | arranged to the expansion | extension state in the Y direction at each side part along the vertical direction (Y direction) of the diaper 1, Leg gathers are formed by the contraction of the leg elastic members 63. Moreover, the waist part elastic member 64 for waist gather formation is distribute | arranged to the X direction at the longitudinal direction (Y direction) edge part by the side of the back side B of the diaper 1, and the waist part elastic member 64 of A waist gather is formed by contraction.

  As shown in FIGS. 1 to 3, the topsheet 2 has a large number of raised portions 21 that are raised on the skin facing surface side and depressions 22 adjacent to the raised portions 21, and the skin facing surface side of the topsheet 2 is The structure has undulations, and the non-skin facing surface side of the topsheet 2 is flat. In the diaper 1, the top sheet 2 includes a first layer 23 and a second layer 24 that are sheet-like materials, as shown in FIG. 3. The first layer 23 constitutes the skin facing surface of the topsheet 2, and the second layer 24 constitutes the non-skin facing surface of the topsheet 2. As shown in FIG. 3, the first layer 23 is formed with a large number of raised portions 21 that are raised toward the skin-facing surface side and are hollow inside, and the recessed portions 22 are formed between the raised portions 21. Yes. Further, the second layer 24 is planar. In the recess 22, the first layer 23 and the second layer 24 are joined via the joint 25. The recess 22 has a joint 25 and a non-joint part on the outer periphery of the joint 25.

  In the surface sheet 2 of the diaper 1, the raised portion 21 is surrounded by a hollow portion 22 having four joint portions 25 as shown in FIG. 3, and its bottom surface is rectangular in plan view. The raised portion 21 is a flat rectangular parallelepiped or truncated quadrangular pyramid with rounded ridgelines as a whole. On the other hand, the recess 22 is also rectangular in plan view. In addition, in the surface sheet 2 of the diaper 1, the raised portion 21 is surrounded by four joint portions 25 (depression portions 22), but is surrounded by more than four joint portions 25 (depression portions 22). May be.

  In the surface sheet 2 of the diaper 1, the raised portions 21 and the recessed portions 22 form rows arranged alternately along the Y direction as shown in FIG. 3, and the rows are arranged in multiple rows in the X direction. Is arranged. When paying attention to any one raised portion 21 in one row, the raised portion 21 is located at a position adjacent to the one raised portion 21 in the left and right rows adjacent to the row in the X direction. Absent. Specifically, in two rows adjacent to each other in the X direction, the joint portions 25 (recess portions 22) are arranged so as to be shifted by a half pitch in the Y direction. Therefore, when attention is paid to any one joint portion 25 (indentation portion 22) in one row, the one junction portion 25 (indentation portion 22) is formed such that the front and rear and the left and right sides thereof are surrounded by the raised portion 21. It is a closed depression. That is, when the surface sheet 2 is viewed in plan from the first layer 23 side, the joint portions 25 (recessed portions 22) are arranged in a staggered pattern, and the raised portions 21 are also arranged in a staggered pattern.

From the viewpoint of reducing the contact pressure with the body and improving the feeling of wearing, the raised portion 21 has a height h (see FIG. 3) of 0.5 mm or more, preferably 1 mm or more, and 5 mm or less, preferably 4 mm or less, more specifically 0.5 mm or more and 5 mm or less, more preferably 1 mm or more and 4 mm or less. Further, the bottom dimension L1 (see FIG. 3) of the raised portion 21 along the Y direction is 2 mm or more and 30 mm or less, preferably 5 mm or less, more specifically 2 mm or more and 30 mm or less, preferably 2 mm. More preferably, it is 5 mm or less. Further, the bottom dimension L2 (see FIG. 3) along the X direction is 2 mm or more and 30 mm or less, preferably 5 mm or less, more specifically 2 mm or more and 30 mm or less, and preferably 2 mm or more and 5 mm or less. More preferably it is. Further, the bottom area of the raised portion 21 is 4 mm ² or more and 900 mm ² or less, preferably 25 mm ² or less, more specifically 4 mm ² or more and 900 mm ² or less, more preferably 4 mm ² or more and 25 mm ² or less. More preferably.

  The length L3 (see FIG. 3) in the X direction of the joint portion 25 of the hollow portion 22 is 0.1 mm or more, preferably 0.5 mm or more, and 20 mm or less, preferably 5 mm or less, more specifically, It is preferable that the thickness is 0.1 mm or more and 20 mm or less, particularly 0.5 mm or more and 5 mm or less from the viewpoint that the touch is good and the cushion feeling is high. The length in the Y direction of the joint portion 25 is the same as the length L3.

  The first layer 23 and the second layer 24 are made of the same or different sheet-like materials. This sheet-like material is substantially non-stretchable. As the material of the sheet, any material that is used in conventionally known diapers and is substantially non-stretchable can be used without particular limitation. For example, various nonwoven fabrics such as a nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a spunlace nonwoven fabric, and a needle punched nonwoven fabric manufactured by the card method can be used. Moreover, the film etc. which enabled liquid permeation | transmission by the opening means can also be used. When a nonwoven fabric is used as the sheet material, the fineness of the constituent fibers is 1 dtex or more, preferably 1.5 dtex or more, and 20 dtex or less, preferably 5.6 dtex or less, more specifically 1 dtex or more and 20 dtex or less. It is preferable from 1.5 dtex or more and 5.6 dtex or less from points, such as ensuring the intensity | strength of the surface sheet 2, and the improvement of the touch.

The basis weight of the first layer 23 is 10 g / m ² or more, preferably 15 g / m ² or more, and 100 g / m ² or less, preferably 30 g / m ² or less, more specifically 10 g / m ² or more. It is preferably 100 g / m ² or less, more preferably 15 g / m ² or more and 30 g / m ² or less. On the other hand, the basis weight of the second layer 24 is 5 g / m ² or more, preferably 10 g / m ² or more, and 50 g / m ² or less, preferably 30 g / m ² or less, more specifically 5 g / m. preferably ² or more 50 g / m ² or less, and more preferably not more than 10 g / m ² or more 30 g / m ^2. The total basis weight of the surface sheet 2 including the first layer 23 and the second layer 24 is 15 g / m ² or more, preferably 20 g / m ² or more, and 150 g / m ² or less, preferably 60 g / m ^2. More specifically, it is preferably 15 g / m ² or more and 150 g / m ² or less, and more preferably 20 g / m ² or more and 60 g / m ² or less.

  A suitable method for manufacturing the top sheet 2 having the above structure is described in Japanese Patent Application Laid-Open No. 2004-174234 and Japanese Patent Application Laid-Open No. 2005-111908 related to the earlier application of the present applicant.

  As shown in FIGS. 1 and 2, the absorbent body 4 has an absorbent core 41 containing an absorbent polymer and a covering material 42 that wraps the absorbent core 41. In the diaper 1, the absorbent body 4 is formed by coating a liquid-retaining absorbent core 41 that is long in the longitudinal direction (Y direction) with a covering material 42 that is a liquid-permeable hydrophilic sheet.

  As shown in FIG. 2, the absorbent core 41 has a relatively low basis weight that is relatively high in grammage and has a high grammage portion 43 that is convex on the back sheet 3 side and is adjacent to the high grammage portion 43. A low basis weight portion 44 that is recessed from the back sheet 3 side toward the top sheet 2 side. As for the absorptive core 41, the high basic weight part 43 and the low basic weight part 44 are integrally molded. As shown in FIG. 2, the absorbent core 41 has a flat skin facing surface side of the absorbent core 41. In the diaper 1, the non-skin facing surface side of the absorbent core 41 has an uneven structure. Specifically, in the diaper 1, as shown in FIGS. 1 and 2, the absorbent core 41 constituting the absorbent body 4 has a high basis weight portion 41 in which the absorbent material is larger than the low basis weight portion 44. The absorbent material has a low basis weight portion 44 (44X, 44Y) that is less than the high basis weight portion 43. As shown in FIG. 1, the absorbent core 41 has a linear (continuous linear) low basis weight portion 44 </ b> X extending in the lateral direction (X direction) and a linear (continuous linear) extending in the vertical direction (Y direction). A plurality of low basis weight portions 44Y. As shown in FIG. 1, the low basis weight portion 44 includes a linear low basis weight portion 44 </ b> X extending in the horizontal direction (X direction) and a linear low basis weight portion 44 </ b> Y extending in the vertical direction (Y direction). The whole is formed in a lattice shape, and the high basis weight portion 43 is disposed in a portion (the position of the lattice eye) partitioned by these linear low basis weight portions 44X and 44Y.

  In the diaper 1, the absorbent core 41 is divided into low basis weight portions 44X and 44Y and low basis weight portions 44X and 44Y arranged in a lattice shape as shown in FIGS. It has a block-shaped region 411 composed of the high basis weight portion 43 disposed in the part, and further has an outer peripheral region 412 disposed over the outer periphery of the block-shaped region 411. As shown in FIGS. 1 and 4, the block-shaped region 411 is formed in a rectangular shape that is long in the vertical direction (Y direction), and the outer peripheral region 412 is on both side edges on the ventral side A and on the back side B. Both side edges extend outward in the lateral direction (X direction) than both side edges in the crotch C, and the portion near the ventral side A from the central part in the vertical direction (Y direction) as a whole is bound inward. It is formed into a shape. As with the high basis weight portion 41, the outer peripheral region 412 has a larger amount of absorbent material than the low basis weight portion 44.

  More specifically, the block-shaped region 411 of the absorbent core 41 will be described in detail. In the diaper 1, as shown in FIG. 4, the high basis weight portion partitioned by the low basis weight portions 44Y and 44X is regularly arranged horizontally. Four block structures arranged in the direction (X direction) are regularly arranged from the abdominal side A to the back side B in 14 rows in the vertical direction (Y direction). In the block shape region 411 of the diaper 1, as shown in FIG. 4, the six low basis weight portions 44 </ b> Y extending in the vertical direction (Y direction) are straight from the ventral side A to the back side B, respectively. It is arranged in a shape.

  In this invention, as shown in FIG. 2, the high basic weight part 43 and the low basic weight part 44 of the absorptive core 41 are integrally molded, and in the diaper 1, the outer periphery area | region 412 also has the high basic weight part 43 and the low basic weight part 43. It is integrally formed with the basis weight portion 44. Here, “being integrally formed” means that the high basis weight portion 43, the low basis weight portion 44, and the outer peripheral region 412 are integrated so as not to be separated from each other without using a bonding means such as an adhesive or heat fusion. It means that it is integrally formed from the same material. Thus, when the high basic weight part 43, the low basic weight part 44, and the outer periphery area | region 412 are integrally molded, it comes to have the continuity which a bodily fluid can move smoothly. A method for manufacturing such an absorber 4 will be described later.

  In the diaper 1, as shown in FIG. 2, the high basic weight part 43 which comprises the block-shaped area | region 411 is convex on the back sheet 3 side, and the outer periphery area | region 412 is also convex on the back sheet 3 side. . Moreover, in the diaper 1, as shown in FIG. 2, the low basic weight part 44 (44Y) which comprises the block-shaped area | region 411 is dented toward the surface sheet 2 side from the back surface sheet 3 side. That is, the concave portion (groove) that is recessed toward the topsheet 2 side in the concave-convex structure of the absorbent core 41 is formed mainly by the low basis weight portions 44 (44X, 44Y), and the backsheet in the concave-convex structure of the absorbent core 41 A convex portion that protrudes toward the third side is mainly formed by the high basis weight portion 43 and the outer peripheral region 412. Here, “the recess is mainly formed by the low basis weight portion 44” means that, for example, the high basis weight portion 43 near the boundary between the low basis weight portion 44 and the high basis weight portion 43 is a part of the recess. In the same way, including the case where it is formed, “the convex portion is mainly formed by the high basis weight portion 43 and the outer peripheral region 412” means, for example, the high basis weight portion 43 and the low basis weight portion 44. Including the case where the low basis weight portion 44 near the boundary of the portion forms part of the convex portion.

  Moreover, as for the absorptive core 41 of the diaper 1, the low basic weight part 44 is unevenly distributed in the surface sheet 2 side (the skin opposing surface side of the absorber 4) in the thickness direction T of the diaper 1, as shown in FIG. ing. As for the absorptive core 41, the surface sheet 2 side is flat as shown in FIG.

When the absorbent core 41 is used in a disposable diaper, the total length in the vertical direction (Y direction) is preferably 250 mm or more and 550 mm or less, and the total width in the horizontal direction (X direction) is preferably 50 mm or more and 200 mm or less.
The block-shaped region 411 has a length in the longitudinal direction (Y direction) of 70% or more, preferably 85% or more, and 98% or less, preferably 98% or less of the entire length of the absorbent core 41 in the Y direction. The length is preferably 95% or less, more specifically 70% or more and 98% or less, and more preferably 85% or more and 95% or less.
The block shape region 411 has a length in the lateral direction (X direction) of 30% or more, preferably 50% or more, and 90% or less, preferably 90% or less of the entire width of the absorbent core 41 in the X direction. The length is preferably 70% or less, more specifically, 30% or more and 90% or less, and more preferably 50% or more and 70% or less.
When the block-shaped region 411 is used for a disposable diaper, the total length in the vertical direction (Y direction) is preferably 100 mm or more and 540 mm or less, and the total width in the horizontal direction (X direction) is preferably 20 mm or more and 140 mm or less.
In the case where the outer peripheral region 412 is used in a disposable diaper, the length in the vertical direction (Y direction) of each end portion in the vertical direction (Y direction) is preferably 10 mm or more and 150 mm or less.
When the outer peripheral region 412 is used in a disposable diaper, the length in the lateral direction (X direction) of each side portion along the longitudinal direction (Y direction) is 10 mm or more and 40 mm or less in the ventral side portion A. Preferably, the crotch part C is preferably 10 mm or more and 30 mm or less, and the back side part B is preferably 10 mm or more and 40 mm or less.

  The block shape region 411 will be described in further detail. In the diaper 1, as shown in FIG. 1, the length in the vertical direction (Y direction) of the low basis weight portion 44 is the vertical direction (Y direction) of the high basis weight portion 43. ) Is shorter than the length of Specifically, the length (L4) in the vertical direction (Y direction) of the linear low basis weight portion 44X extending in the horizontal direction (X direction) is the length in the vertical direction (Y direction) of the high basis weight portion 43. This is shorter than (L6). The length (L4) of the low basis weight portion 44 (44X) is preferably 3% or more and 20% or less of the length (L6) of the high basis weight portion 43.

Hereinafter, the size and basis weight of the high basis weight portion 43 and the low basis weight portion 44 (44X, 44Y) will be described in more detail.
When the absorbent article is used for a disposable diaper, for example, the width L4 of the linear low basis weight portion 44X extending in the horizontal direction (X direction) increases the curvature in the vertical direction (Y direction). From the viewpoint of being able to fit well to the body, and after excretion, the absorbent body 4 swells into a concavo-convex shape larger than the undulation of the topsheet, thereby creating a gap between the skin of the wearer and the topsheet, and breathability From the viewpoint of improving the thickness, it is preferably 0.5 mm or more, preferably 1 mm or more, and 5 mm or less, preferably 3 mm or less, more specifically 0.5 mm or more and 5 mm or less, preferably 1 mm or more and 3 mm. More preferably, it is as follows.
The width L5 of the linear low basis weight portion 44Y extending in the longitudinal direction (Y direction) is increased by increasing the curvature in the lateral direction (X direction) when the absorbent article is used in a disposable diaper, for example. From the viewpoint of reducing the burden on the crotch portion, and after excretion, the absorbent body 4 swells into a concavo-convex shape larger than the undulation of the topsheet, thereby creating a gap between the skin of the wearer and the topsheet From the viewpoint of improving air permeability, 0.5 mm or more, preferably 1 mm or more, and 5 mm or less, preferably 3 mm or less, more specifically 0.5 mm or more and 5 mm or less is preferable, and 1 mm More preferably, it is 3 mm or less.
The widths L4 and L5 are measured values at the position of the bottom of the recess in the concavo-convex structure of the absorber 4.

In the diaper 1, the high basis weight portion 43 is formed in a rectangular shape that is long in the vertical direction (Y direction) in plan view, as shown in FIG. 1. In the diaper 1, the high basis weight portion 43 is formed in a rectangular shape in plan view, but the four corners may have an arc shape, such as a polygonal shape, an ellipse, or a combination thereof. Also good.
The high basis weight portion 43 of the diaper 1 is good for the wearer's body by enhancing the curvature in the vertical direction (Y direction) and the horizontal direction (X direction) when the absorbent article is used in a disposable diaper, for example. 1, the length L6 in the longitudinal direction (Y direction) is 5 mm or more, preferably 15 mm or more, and 30 mm or less, preferably 25 mm or less, as shown in FIG. Is preferably 5 mm or more and 30 mm or less, and more preferably 15 mm or more and 25 mm or less. Further, the length L7 in the lateral direction (X direction) is 3 mm or more, preferably 5 mm or more, and 20 mm or less, preferably 15 mm or less, more specifically 3 mm or more and 20 mm or less, preferably 5 mm. More preferably, it is 15 mm or less.

When the absorbent article is used in a disposable diaper, for example, the low basis weight portion 44 (44X, 44Y) is formed on the skin of the wearer by swelling the absorbent body 4 into an uneven shape larger than the undulation of the topsheet after excretion. The basis weight is 20% or more, preferably 30% or more, and 80% of the basis weight of the high basis weight portion 43 from the viewpoint of improving the air permeability by forming a gap between the surface sheet and the surface sheet. % Or less, preferably 70% or less, more specifically 20% or more and 80% or less, and more preferably 30% or more and 70% or less.
Specifically, the low basis weight portion 44 (44X, 44Y) has a basis weight of 100 g / m ² or more, preferably 150 g / m ² or more, and 500 g / m ² or less, preferably 400 g / m ^2. More specifically, it is preferably 100 g / m ² or more and 500 g / m ² or less, more preferably 150 g / m ² or more and 400 g / m ² or less. The high basis weight portion 43 has a basis weight of 300 g / m ² or more, preferably 350 g / m ² or more, and 900 g / m ² or less, preferably 800 g / m ² or less, more specifically, It is preferably 300 g / m ² or more and 900 g / m ² or less, and more preferably 350 g / m ² or more and 800 g / m ² or less. The basis weight of the outer peripheral region 412 is the same as the basis weight of the high basis weight portion 41.

The thickness of the low basis weight portion 44 (44X, 44Y) is preferably 30% or more and 90% or less of the thickness of the high basis weight portion 43. Specifically, the thickness of the low basis weight portion 44 (44X, 44Y) is 1.5 mm or more, preferably 2.5 mm or more, and 4.5 mm or less, preferably 4 mm or less, more specifically 1 It is preferably 5 mm or more and 4.5 mm or less, and more preferably 2.5 mm or more and 4 mm or less. The thickness of the high basis weight portion 43 is 2 mm or more, preferably 3 mm or more, and 8 mm or less, preferably 7 mm or less, more specifically 2 mm or more and 8 mm or less, and preferably 3 mm or more and 7 mm or less. Is more preferable. The thickness of the outer peripheral region 412 is the same as the thickness of the high basis weight portion 41.
In addition, the thickness of the high basic weight part 43, the low basic weight part 44 (44X, 44Y), and the outer periphery area | region 412 cuts a sample to a predetermined size, pressurizes the measurement site | part for 10 minutes at 5 kPa, and immediately after dewetting Measure. The measurement location is 3 points or more including one or more of each of the abdominal side, crotch, and dorsal side per sheet, and the average thickness of 2 diaper samples (6 or more measurement locations) is obtained. For example, the diaper 1 is cut with a sharp razor in the vertical direction (Y direction) or the horizontal direction (X direction) shown in FIG. 1, 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).
The basic weight of the high basic weight part 43 and the low basic weight part 44 is measured as follows.

<Measurement method of basis weight>
The measuring method of the basic weight of the high basic weight part 43, the low basic weight part 44, and the outer periphery area | region 412 is as follows.
Cut along the boundary line between the high basis weight portion 43 and the low basis weight portion 44 in the absorbent core 41 using a feather blade razor. Ten pieces of the high basis weight portion 43 obtained by cutting were 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 outer peripheral region 412 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 (Y direction) of the high basis weight portion 43 and the low basis weight portion 44 (44Y), the length is designed to be 100 mm and the width is the width of the low basis weight portion 44 (44Y). In accordance with the dimensions, five small pieces of a thin striped low basis weight portion 44 (44Y) are cut out using a feather blade razor. Each of the 5 pieces obtained was measured using an electronic balance (Electronic Balance GR-300, manufactured by A & D, accuracy: 4 digits after the decimal point), and averaged, the average of one piece of the low basis weight portion 44 (44Y). Find the weight. The basis weight of the low basis weight portion 41 (44Y) is calculated by dividing the determined average weight by the average area per piece of the low basis weight portion 44 (44Y). For the low basis weight portion 44 (44X), the basis weight is calculated in the same manner as the low basis weight portion 44 (44Y).

In the absorbent body 4 of the diaper 1, the high basis weight part 43 and the outer peripheral region 412 are formed to be substantially the same or denser than the low basis weight part 44 (44X, 44Y).
The low basis weight portion 44 (44X, 44Y) is 50% or more of the density of the high basis weight portion 43 from the viewpoint of improving flexibility when the absorbent article is used in, for example, a disposable diaper. Preferably, it is 75% or more and 100% or less, preferably 95% or less, more specifically 50% or more and 100% or less, more preferably 75% or more and 95% or less.
Specifically, low basis weight portion 44 (44X, 44Y) is its density, 0.05 g / cm ³ or higher, preferably 0.07 g / cm ³ or more, and, 0.15 g / cm ³ or less, preferably the 0.13 g / cm ³ or less, and more specifically, is preferably not more than 0.05 g / cm ³ or more ^{0.15g / cm 3, 0.07g / cm} 3 or more 0.13 g / cm ³ or less More preferably it is. Also, high basis weight portion 43, its density, 0.05 g / cm ³ or higher, preferably 0.07 g / cm ³ or more, and, 0.15 g / cm ³ or less, preferably 0.13 g / cm ³ or less it is further preferred more specifically is preferably not more than 0.05 g / cm ³ or more 0.15 g / cm ^3, it is 0.07 g / cm ³ or more 0.13 g / cm ³ or less. The density of the outer peripheral region 412 is the same as the density of the high basis weight portion 41.
As for the density of the high basic weight part 43, the outer periphery area | region 412, and the low basic weight part 44 (44X, 44Y), the basic weight of the high basic weight part 43 calculated | required by the method mentioned above, the outer periphery area | region 412, and the low density part 44 is mentioned above. It is calculated by dividing by the respective thicknesses obtained by the above method.

  In the diaper 1, a space 9 is formed between the low basis weight portion 44 (44 </ b> X, 44 </ b> Y) of the absorbent core 41 and the covering material 42. That is, the absorbent body 4 is formed with a space 9 formed by the uneven structure of the absorbent core 41 and the covering material 42 that wraps the absorbent core 41. As described above, in the diaper 1, as shown in FIG. 1 and FIG. 2, the low basis weight portion 44 (44X, 44Y) is a lattice on the back sheet 3 (non-skin facing surface) side of the absorbent core 41 as a whole. The high basis weight portion 43 is arranged at the position of the grid, and the low basis weight portion 44 is formed so as to surround the high basis weight portion 43. Therefore, in the diaper 1, as shown in FIGS. 1 and 2, the plurality of spaces 9 </ b> X formed by the low basis weight portion 44 </ b> X and the covering material 42 that are recessed toward the topsheet 2 side correspond to the low basis weight portion 44 </ b> X. A plurality of spaces 9Y formed by the low basis weight portion 44Y and the covering material 42 that are continuously extended in the lateral direction (X direction) and recessed on the surface sheet 2 side correspond to the low basis weight portion 44Y. Thus, they extend continuously in the vertical direction (Y direction).

  In the diaper 1, as shown in FIG. 2, the skin-side covering material 421 on the skin-facing surface side and the flat skin-facing surface 41 </ b> T of the absorbent core 41 in the covering material 42 that wraps the absorbent core 41 are skin-side absorbent. It is fixed via a core adhesive 51T (see FIG. 2 (a)). Moreover, in the diaper 1, the non-skin-side coating material 422 on the non-skin facing surface side of the coating material 42 and the non-skin facing surface 41U of the absorbent core 41 are combined with a non-skin-side absorbent core adhesive 51U (FIG. 2B). )) Is fixed via). In the diaper 1, as shown in FIG. 2, both sides of the covering material 42 are folded using a single covering material 42, and the side edges of the covering material 42 are disposed on the back sheet 3 side of the absorbent core 41. The absorbent core 41 is wrapped so as to overlap each other. Therefore, in one covering material 42, the portion disposed on the skin facing surface 41 </ b> T side of the absorbent core 41 becomes the skin side covering material 421, and the portion disposed on the non-skin facing surface 41 </ b> U side of the absorbent core 41. A non-skin side covering material 422 is formed. In the diaper 1, as described above, the skin-side coating material 421 and the non-skin-side coating material 422 are formed from one coating material 42, but may be formed from two separate coating materials. Good.

Moreover, in the diaper 1, as shown in FIG. 2, the skin side coating | covering material 421 and the surface sheet 2 are being fixed via the skin side absorber adhesive 5T (refer FIG.2 (c)). Thus, in the diaper 1, there is no other sheet between the top sheet 2 and the covering material 42 (skin side covering material 421), and the top sheet 2 is directly on the covering material 42 (skin side covering material 421). Since it is arranged, the skin side covering material 421 and the surface sheet 2 are fixed via the skin side absorbent adhesive 5T. However, when, for example, a sublayer sheet is arranged between the surface sheet 2 and the covering material 42 (skin side covering material 421), the skin side covering material 421 and the sublayer sheet on the surface sheet 2 side are separated. What is necessary is just to be fixed via the skin side absorber adhesive agent 5T.
Moreover, in the diaper 1, as shown in FIG. 2, the non-skin side coating | covering material 422 and the back surface sheet 3 are being fixed via the non-skin side absorber adhesive agent 5U (refer FIG.2 (d)).

  Moreover, in the diaper 1, the coating area rate of the skin side absorptive core adhesive 51T is lower than the coating area rate of the non-skin side absorptive core adhesive 51U. Specifically, the coating area ratio of the skin-side absorbent core adhesive 51T is 2% or more, preferably 5% or more, and 40% or less, preferably 20% or less, more specifically. It is preferably 2% or more and 40% or less, and more preferably 5% or more and 20% or less. On the other hand, the coating area ratio of the non-skin-side absorbent core adhesive 51U is 20% or more, preferably 30% or more, and 100% or less, preferably 80% or less, more specifically, 20%. % Is preferably 100% or less and more preferably 30% or more and 80% or less.

<Measurement method of coating area ratio of adhesive 5>
After spraying toner on a predetermined part and coloring the adhesive, an area cut out to a predetermined size and colored is measured. The coating area ratio is obtained by dividing the measured area by the cut size. The number of measurement points is 3 or more, the average value thereof is obtained, and the coating area ratio is calculated.

In order to make the coating area ratio of the skin-side absorbent core adhesive 51T lower than the coating area ratio of the non-skin-side absorbent core adhesive 51U, in the diaper 1, the skin-side absorbent core adhesive 51T is: As shown to Fig.2 (a), it coats in the spiral shape long in the vertical direction (Y direction), for example using the spray gun. It may be intermittent in the lateral direction (X direction).
In addition to the spiral shape, a long Ω (omega) shape in the vertical direction (Y direction) may be used. The Ω (omega) shape is an Ω shape, and the amount of adhesive applied can be reduced or the adhesive oozing out at the intersection can be prevented by having no or few adhesive intersections.

  Further, in the diaper 1, the non-skin-side absorbent core adhesive 51U is intermittently used in the horizontal direction (X direction) and the vertical direction (Y direction) using, for example, a coater gun, as shown in FIG. It is applied in a straight line, and is applied in a stripe shape as a whole. The interval between the non-skin-side absorbent core adhesives 51U adjacent in the lateral direction (X direction) is preferably 0.5 mm or more and 15 mm or less. Since the non-skin-side absorbent core adhesive 51U is applied in this way, the non-skin-side coating material 422 of the coating material 42 and the non-skin facing surface 41U of the concavo-convex structure of the absorbent core 41 are bonded and fixed. The non-skin-side covering material 422 easily follows the concavo-convex structure of the absorbent core 41 and enters the recess of the low basis weight portion 44 (44X, 44Y) (see FIG. 2).

Moreover, in the diaper 1, the skin side absorber adhesive 5T is longitudinally (Y direction) using a spray gun as shown in FIG.2 (c) similarly to the skin side absorptive core adhesive 51T. It is coated in a long spiral. It may be intermittent in the lateral direction (X direction). The basis weight of the application of the skin-side absorbent adhesive 5T is 0.5 g / m ² or more, preferably 1 g / m ² or more, and 15 g / m ² or less, preferably 10 g / m ² or less, more specifically. the, is preferably 0.5 g / m ² or more 15 g / m ² or less, and further preferably 1 g / m ² or more 10 g / m ² or less.

In the diaper 1, the non-skin-side absorbent adhesive 5 </ b> U, as shown in FIG. 2 (d), continuously drops the adhesive with a constant width using, for example, a bead gun, and the width direction (X direction) It is applied in a straight line in the longitudinal direction (Y direction) intermittently, and is applied in a stripe shape as a whole. The basis weight of the application of the non-skin-side absorbent adhesive 5U is 0.5 g / m ² or more, preferably 1 g / m ² or more, and 15 g / m ² or less, preferably 10 g / m ² or less, more specifically Specifically, it is preferably 0.5 g / m ² or more and 15 g / m ² or less, and more preferably 1 g / m ² or more and 10 g / m ² or less. The interval between the non-skin-side absorbent adhesives 5U adjacent in the lateral direction (X direction) is preferably 10 mm or more and 40 mm or less. Thus, since the non-skin-side absorbent adhesive 5U is applied and the non-skin-side covering material 422 and the back sheet 3 of the covering material 42 are bonded and fixed, the back sheet 3 is made of the non-skin side covering material. Like 422, it easily follows the concave-convex structure of the absorbent core 41 and enters the recess of the low basis weight portion 44 (44X, 44Y) (see FIG. 2).

  As described above, in the absorbent body 4 of the diaper 1, as shown in FIG. 1 and FIG. 4, the portion divided by the linear low basis weight portions 44 </ b> X and 44 </ b> Y (lattice eye position) The weight portion 43 is arranged, and the absorbent core 41 of the absorbent body 4 has a high basis weight portion 43 and a low basis weight portion 44 (a low basis weight portion 44Y extending in the vertical direction (Y direction)) in the horizontal direction ( In the X direction), and the high basis weight portions 43 and the low basis weight portions 44 (low basis weight portions 44X extending in the horizontal direction (X direction)) are alternately arranged in the vertical direction (Y direction). ing. Since the skin-side absorbent core adhesive 51T coated in a spiral shape intersects at a plurality of points on the low-tsubo both portions 44Y, the skin-side covering material 421 absorbs when the absorbent core 41 is curved. Since it does not leave the sex core 41, it does not hinder the bendability. In the diaper 1, as described above, the skin-side absorbent core adhesive 51 </ b> T has a plurality of spirals intersecting the low-tsubo both portions 44 </ b> Y, but the skin-side absorbent core coated in a spiral shape. If at least one spiral of the adhesive 51T and the skin-side absorbent adhesive 5T intersects at a plurality of points on the low-tsubo both portions 44Y, the above-described effect can be obtained.

Next, the absorbent core 41 provided in the diaper 1, that is, the absorbent core 41 in which the high basis weight portion 43 (high density), the outer peripheral region 412 (high density), and the low basis weight portion 44 (low density) are integrally formed. The manufacturing method of the absorber 4 provided is demonstrated.
FIG. 5 shows an embodiment of a method for manufacturing the absorbent body 4 and a manufacturing apparatus used therefor. The manufacturing apparatus of the absorbent body 4 includes a rotary drum 50 that is rotationally driven in the direction of arrow R1, and a duct 60 that supplies an absorbent material 45 containing an absorbent polymer that is a raw material of the absorbent core 41 to the outer peripheral surface of the rotary drum 50. The transfer roll 70 disposed obliquely below and downstream of the rotary drum 50 and driven to rotate in the direction of the arrow R2, and the vacuum box 65 disposed between the duct 60 and the transfer roll 70 in the circumferential direction of the rotary drum 50 A mesh belt 75 that is a sheet-like air-permeable member disposed between the vacuum box 65 and the rotary drum 50 and between the transfer roll 70 and the rotary drum 50, and below the transfer roll 70. A vacuum conveyor 80 is provided.

  As shown in FIG. 5, the rotating drum 50 has a cylindrical shape, and receives power from a motor such as a motor, so that members forming the outer peripheral surface rotate around a horizontal axis. A space 56 capable of depressurizing the inside is formed in a non-rotating portion inside the rotating drum 50 (on the rotating shaft side). A known exhaust device (not shown) such as an intake fan is connected to the space 56, and the interior of the space 56 can be maintained at a negative pressure by operating the exhaust device. On the other hand, piping (not shown) capable of taking in air outside the apparatus is connected to the spaces 57 and 58 on the inner side (rotating shaft side) of the rotating drum 50.

  As shown in FIG. 5, a plurality of drum recesses 51 having a shape corresponding to the shape of the absorbent core 41 to be manufactured are formed on the outer peripheral surface of the rotary drum 50 at equal intervals in the R1 direction. As shown in FIG. 6, a mesh plate 52 in which a large number of pores are formed and a metal or resin impermeable member 53 are arranged on the bottom surface of each drum recess 51. Here, the air-impermeable member 53 is provided so as to protrude on the mesh plate 52, and is disposed so as to correspond to the shape and position of the low basis weight portion 44 (44X, 44Y) described above. As shown in FIG. 6, the region 54 composed only of the mesh plate 52 partitioned by the air-impermeable member 53 arranged in this way becomes a portion corresponding to the high basis weight portion 43, and is partitioned by the air-impermeable member 53. A region 55 consisting only of the mesh plate 52 in the entire outer periphery of the portion thus formed becomes a portion corresponding to the outer peripheral region 412. Moreover, the part of the outer peripheral surface of the rotating drum 50 in which the drum recessed part 51 is not formed consists of the frame body of the rotating drum 50 which consists of metal rigid bodies, and is non-breathable.

  As shown in FIG. 5, one end side of the duct 60 covers the outer peripheral surface of the rotary drum 50 positioned on the space 56 maintained at a negative pressure, and the other end side (not shown) has a fiber material introduction device. have. The fiber material introducing device includes, for example, a pulverizer that pulverizes sheet-like wood pulp into defibrated pulp and feeds the defibrated pulp (fiber material) into the duct, and introduces an absorbent polymer into the duct 60. An absorbent polymer introduction part is provided.

  The transfer roll 70 has a cylindrical outer peripheral portion having air permeability, and the outer peripheral portion rotates in the R2 direction upon receiving power from a prime mover such as a motor. In the non-rotating portion on the inner side (rotating shaft side) of the transfer roll 70, a space 71 that can be depressurized is formed. A known exhaust device (not shown) such as an intake fan is connected to the space 71, and the interior of the space 71 can be maintained at a negative pressure by operating the exhaust device.

  The vacuum box 65 is disposed between the downstream end 601 of the duct 60 and the transfer roll 70 in the rotation direction R1 of the rotary drum 50. The vacuum box 65 has a box-like shape and has an opening that opens in the direction of the rotating drum 50 at a portion facing the rotating drum 50. The vacuum box 65 is connected to a known exhaust device (not shown) such as an intake fan via an exhaust pipe 67, and the inside of the vacuum box 65 can be maintained at a negative pressure by the operation of the exhaust device. .

  The mesh belt 75 is a belt-shaped breathable belt having a mesh connected endlessly, and is continuously guided along a plurality of free rolls and transfer rolls 70 to move along a predetermined path. The mesh belt 75 is driven by the rotation of the transfer roll 70. While the mesh belt 75 passes in front of the opening of the vacuum box 65, the mesh belt 75 is in contact with the outer peripheral surface of the rotary drum 50, and the transfer roll 70 and the rotary drum 50 are closest to each other. In the vicinity of the portion, the transfer drum 70 moves away from the outer peripheral surface of the rotating drum 50.

  The vacuum conveyor 80 includes an endless breathable belt 83 that is stretched between the drive roll 81 and the driven roll 82, and a vacuum box 84 that is disposed at a position facing the transfer roll 70 with the breathable belt 83 interposed therebetween. ing.

Next, a method for continuously manufacturing the absorbent body 4 (absorbent core 41) using the above-described absorbent body manufacturing apparatus will be described.
First, the exhaust device connected to each of the space 56 in the rotary drum 50 and the vacuum box 65 is operated to make negative pressure. This is because the negative pressure in the space 56 causes an air flow that conveys the absorbent material 45 to the outer peripheral surface of the rotary drum 50 in the duct 60. Next, the rotating drum 50 and the transfer roll 70 are rotated, and the vacuum conveyor 80 is operated. Then, when the fiber material introduction device is operated to supply the fiber material into the duct 60 and further supply the absorbent polymer, these absorbent materials 45 ride on the air flow flowing through the duct 60 and are scattered. And is supplied toward the outer peripheral surface of the rotating drum 50.

  While the portion covered with the duct 60 is being conveyed, the absorbent material (mixture of fiber material and absorbent polymer) 45 is sucked into the drum recess 51 of the rotary drum 50. As shown in FIG. 7, the absorbent material 45 is gradually deposited on the mesh plate 52 in each region 54 and region 55 of the drum recess 51. In the deposit 46 obtained in this way, a portion (a portion corresponding to the breathable member 53) 46a formed by depositing the absorbent material 45 on the breathable member 53 has a relatively large deposit amount of the absorbent material 45. The other portion (region 54 corresponding portion) 46b and the portion (region 55 corresponding portion) 46c have a relatively large amount of the absorbent material 45 deposited, and the deposit 46 as a whole has an uneven structure. Become.

  Then, when the rotary drum 50 rotates and the drum concave portion 51 comes to the position opposite to the vacuum box 65, the deposit 46 in the drum concave portion 51 is sucked to the mesh belt 75 by the suction from the vacuum box 65. It becomes. In this state, the deposit 46 in the drum recess 51 is conveyed to a position immediately before the closest portion between the transfer roll 70 and the rotary drum 50, and is sucked from the transfer roll 70 side in the vicinity of the closest portion to the mesh belt. The mold is released from the drum recess 51 while being sucked by 75 and moved onto the transfer roll 70.

  In this way, the deposit 46 having the concavo-convex structure transferred onto the transfer roll 70 together with the mesh belt 75 is adsorbed to the mesh belt 75 on the transfer roll 70 while being transferred to the vacuum conveyor 80 (the lowermost end of the transfer roll 70). And is transferred to the vacuum conveyor 80 by suction by the vacuum box 84 at the delivery section.

  In the absorbent body manufacturing apparatus of the present embodiment, as shown in FIG. 5, a covering material 42 made of tissue paper or a hydrophilic nonwoven fabric is introduced onto a vacuum conveyor 80 before the deposit 46 is placed. Then, the deposit 46 moves on the covering material 42. Further, after the covering material 42 is folded by a folded plate (not shown) and the deposit 46 is wrapped with the covering material 42, the deposit 46 in the state wrapped with the covering material 42 is cut at a predetermined interval. Thus, the absorber precursor 49 cut to the size of one absorber is continuously manufactured.

  And in the absorber manufacturing apparatus of this embodiment, the absorber precursor 49 obtained in this way is compressed by the pressurizing means 90, and the thickness of the deposit 46 which comprises the absorber precursor 49 is actively reduced. Thus, the intended absorber 4 (absorbent core 41) is obtained. As shown in FIG. 5, the pressurizing unit 90 includes a pair of rolls 91 and 92 having at least one smooth surface, and pressurizes an object to be pressed introduced between the rolls 91 and 92 from above and below the thickness. It is configured to be compressible in the direction.

  When the deposit 46 is compressed by the pressurizing means 90, the portion (region 54 corresponding portion) 46b and the portion (region 55 corresponding portion) 46c where the absorbent material is relatively large and the thickness is relatively large. The portion is compressed more strongly than the portion 46a having a small thickness (corresponding to the breathable member 53). As a result, in the absorbent body 4 (absorbent core 41) manufactured using the manufacturing apparatus described above, the portion (region 54 corresponding portion) 46b (convex portion) and the portion (region 55 corresponding portion) 46c of the deposit 46 are included. However, in the absorbent core 41, the high basis weight portion 43 and the outer peripheral region 412 having a relatively high density are formed, and a portion (corresponding portion) 46a (concave portion) in the deposit 46 is relatively in the absorbent core 41. Thus, the low basis weight portion 44 having a low density is obtained.

The formation material of the disposable diaper 1 of this embodiment is demonstrated.
The back sheet 3 and the three-dimensional gather forming sheet 62 can be used without particular limitation as long as they are normally used for absorbent articles such as disposable diapers. For example, as the back sheet 3, a resin film or a laminate of a resin film and a nonwoven fabric can be used. As the three-dimensional gather forming sheet 62, a stretchable film, a nonwoven fabric, a woven fabric, or a laminated sheet thereof can be used.
The fastening tape 7 can be used without particular limitation as long as it is usually used for absorbent articles such as disposable diapers. For example, male members in “Magic Tape (registered trademark)” (manufactured by Kuraray Co., Ltd.), “Quicklon (registered trademark)” (manufactured by YKK), “Majikurosu (registered trademark)” (manufactured by Kanebo Bell Touch), etc. Can be used.

As the absorptive core 41 that constitutes the absorbent body 4, a structure in which absorbent polymer particles are held in an aggregate of fibers such as pulp fibers can be used. As the covering material 42 constituting the absorbent body 4, a hydrophilic sheet, for example, a core-wrap sheet made of a water-permeable thin paper (tissue paper) or a water-permeable nonwoven fabric can be used.
Examples of the elastic member 61 for forming a three-dimensional gather, the leg elastic member 63, and the waist elastic member 64 include natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, and ethyl acrylate-ethylene. A thread-like stretchable material made of a polyethylene-α-olefin copolymer or the like can be used.

  As the adhesive 5 (skin-side absorbent core adhesive 51T, non-skin-side absorbent core adhesive 51U, skin-side absorbent adhesive 5T, non-skin-side absorbent adhesive 5U), absorption of disposable diapers or the like is usually performed. If it is a thing used for a property article, it can use without a restriction | limiting especially, For example, a hot-melt-adhesive can be used. Examples of the hot melt adhesive include blocks such as styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), and styrene-ethylene-butylene-styrene copolymer (SEBS). Copolymer-based hot melt adhesives may be mentioned.

The effect at the time of using the disposable diaper 1 of embodiment of this invention mentioned above is demonstrated.
As shown in FIGS. 1 and 2, the diaper 1 has a structure in which the surface sheet 2 has a undulation on the skin facing surface side and the non-skin facing surface side is flat, and the skin facing of the absorbent core 41 of the absorbent body 4. The surface side is flat. Since such a surface sheet 2 is used, the diaper 1 has improved air permeability and improved touch. And by such a combination of the topsheet 2 and the absorber 4, the bendability is improved. Further, as shown in FIG. 2, the diaper 1 has a skin-side covering material 421 and a flat skin-facing surface 41T of the absorbent core 41 fixed through a skin-side absorbent core adhesive 51T, so that the non-skin-side covering The material 422 and the non-skin facing surface 41U of the absorbent core 41 are fixed via a non-skin-side absorbent core adhesive 51U. That is, the skin-side covering material 421 on the flat non-skin facing surface side of the topsheet 2 and the flat skin-facing surface 41T of the absorbent core 41 are fixed via the skin-side absorbent core adhesive 51T, and the non-skin side Since the covering material 422 and the non-skin facing surface 41U of the concavo-convex structure of the absorbent core 41 are fixed via the non-skin-side absorbent core adhesive 51U, a sheet having a thickness with a structure having undulations on the top sheet 2 Even if it is used, it is possible to take advantage of the features of the concavo-convex structure of the absorbent core 41, and it is easy to bend in the lateral direction (X direction) of the diaper 1 as shown in FIGS. 8 (a) and 8 (b). Become. Therefore, the diaper 1 has improved bendability, improved breathability, and improved touch.

  Moreover, since the diaper 1 is using the surface sheet 2 which has many protruding parts 21 inside as shown in FIG. 3, air permeability improves further and the touch improves.

  Moreover, as for the diaper 1, the non-skin-side coating | covering material 422 is following the uneven | corrugated structure of the absorptive core 41, as shown in FIG. 2, and has entered the dent (space 9) of the low basic weight part 44. FIG. Therefore, as shown in FIG. 8 (b), when the diaper 1 is viewed in a cross-section and is convexly curved toward the back sheet 3, the non-skin side covering material 422 is allowed to extend, and further the diaper 1 It becomes easy to bend in the horizontal direction (X direction). In particular, in the diaper 1, the back sheet 3 also follows the uneven structure of the absorbent core 41 as shown in FIG. 2, and enters the dent (space 9) of the low basis weight portion 44. Therefore, as shown in FIG. 8 (b), when the diaper 1 is viewed in cross section and curved convexly toward the back sheet 3, the back portion of the back sheet 3 is allowed to stretch, and further the diaper 1 in the lateral direction ( It becomes easy to curve in the X direction.

  In addition, as shown in FIG. 2, the diaper 1 is coated with a skin-side absorbent core adhesive 51T in a spiral shape that is intermittent in the horizontal direction (X direction) and long in the vertical direction (Y direction). The side absorbent core adhesive 51U is applied intermittently in the horizontal direction (X direction) and in a straight line in the vertical direction (Y direction). In addition, as shown in FIG. 2, the diaper 1 has a skin-side absorbent adhesive 5T applied in a spiral shape intermittently in the horizontal direction (X direction) and long in the vertical direction (Y direction). The absorbent adhesive 5U is applied intermittently in the horizontal direction (X direction) and in a straight line in the vertical direction (Y direction). Thus, the non-skin-side absorbent core adhesive 51U and the non-skin-side absorbent adhesive 5U disposed on the non-skin facing surface 41U side of the uneven structure in the absorbent core 41 are respectively in the lateral direction (X direction). Since it is applied in a straight line in the longitudinal direction (Y direction), it is curved in the lateral direction (X direction) of the diaper 1 as shown in FIGS. 8 (a) and 8 (b). It becomes easy.

  Moreover, as for the diaper 1, the coating area rate of the skin side absorptive core adhesive 51T is smaller than the coating area rate of the non-skin side absorptive core adhesive 51U. As described above, the non-skin-side absorption in which the coating area ratio of the skin-side absorbent core adhesive 51T in which the skin facing surface of the uneven structure in the absorbent core 41 is disposed on the 41T side is disposed on the non-skin facing surface 41U side. Since it is smaller than the adhesive core adhesive 51U, as shown in FIG. 9, the skin side swells larger than the non-skin side of the diaper 1 in a concavo-convex shape after excretion, and there is a gap between the wearer's skin and the surface sheet. And the air permeability can be improved.

  The disposable diaper which is one embodiment of the absorbent article of the present invention is not limited to the disposable diaper of the above-described embodiment, and can be appropriately changed.

  For example, in the disposable diaper 1 of the above-described embodiment, as shown in FIGS. 2 and 3, the topsheet 2 is composed of a first layer 23 and a second layer 24 of a sheet-like material, and the topsheet 2 faces the skin. The first layer 23 constituting the surface has a large number of raised portions 21 which are raised on the skin facing surface side and are hollow inside, and the second layer 24 constituting the non-skin facing surface of the topsheet 2 is a flat surface. It is in the shape. Instead of such a surface sheet 2, as shown in FIG. 10, a large number of raised portions 21 made of a single-layer fiber assembly and having a solid inside on the skin facing surface side, and raised portions 21 The non-skin facing surface side has a substantially flat shape, and the raised portions 21 and the recessed portions 22 extend in the vertical direction (Y direction) and alternate in the horizontal direction (X direction). You may use the surface sheet currently arranged in parallel. Such a disposable diaper having a surface sheet in which the raised portion 21 and the recessed portion 22 having a solid interior extend in the vertical direction (Y direction) and are alternately arranged in the horizontal direction (X direction) The bendability is improved and the air permeability in the vertical direction is improved.

  Moreover, it replaces with the above-mentioned surface sheet 2, and contains the 1st fiber layer containing a heat-shrinkable fiber, the fiber which does not heat-shrink substantially, or the fiber which does not heat-shrink substantially at the shrinkage start temperature of the said heat-shrinkable fiber. After laminating and partially bonding the second fiber layer, a sheet having undulations obtained by shrinking the first fiber layer by hot air treatment may be used as the top sheet. In the surface sheet, the second fiber layer is raised at a portion other than the joint portion with the first fiber layer to form a raised portion, while the joint portion forms a depression. The heat-shrinkable fiber is preferably a latent crimpable fiber. As the sheet having such undulations, those described in JP 2002-187228 A, JP 2003-250836 A, JP 2004-166849 A, JP 2004-202890 A, and the like are used. Out.

  Moreover, in the disposable diaper 1 of the above-mentioned embodiment, as shown to FIG. 1, FIG. 4, the absorptive core 41 of the absorber 4 is a rectangular block-shaped area | region 411 long in a vertical direction (Y direction), And an outer peripheral region 412 arranged over the outer periphery of the block-shaped region 411. Instead of the absorbent core 41 of the absorbent body 4, the absorbent cores 41 </ b> A to 41 </ b> D shown in FIGS. 11 to 14 may be provided. Regarding the absorbent cores 41 </ b> A to 41 </ b> D shown in FIGS. 11 to 14, the explanation in detail regarding the absorbent core 41 included in the diaper 1 is appropriately applied to points that are not particularly described. Moreover, in FIGS. 11-14, the same code | symbol is attached | subjected to the same member as FIG. The absorbent cores 41 </ b> A to 41 </ b> D shown in FIG. 11 to FIG. 14 are lateral (X direction) outward in both side edges in the ventral side A and both side edges in the back side B than the side edges in the crotch C. And has a block-shaped region 411 formed in a shape in which the central portion in the longitudinal direction (Y direction) is constricted inward as a whole, and the shape in which the central portion in the longitudinal direction (Y direction) is constricted inward The outer peripheral region 412 is formed. Moreover, it replaces with the absorptive core 41 of the above-mentioned absorber 4, and does not have the outer periphery area | region 412, but each of several linear low basic weight part 44X extends over the full length of a horizontal direction (X direction), An absorptive core in which each of the plurality of linear low basis weight portions 44Y extends over the entire length in the vertical direction (Y direction) may be used.

  The block shape region 411 of the absorbent core 41A shown in FIG. 11 will be described more specifically. In the absorbent core 41 </ b> A, as shown in FIG. 11, the back side portion 411 b of the block shape region 411 is regularly formed by a high basis weight portion 43 partitioned by low basis weight portions 44 (44 </ b> X, 44 </ b> Y). Five block structures arranged in the direction (X direction) are regularly arranged in four rows in the vertical direction (Y direction). As shown in FIG. 11, the crotch part 411c of the block-shaped region 411 has a block structure in which three high basis weight portions 43 are regularly arranged in the horizontal direction (X direction). Seven rows are arranged in the (Y direction). Further, as shown in FIG. 11, the ventral side portion 411a of the block-shaped region 411 has a high basis weight portion 43 partitioned by low basis weight portions 44 (44X, 44Y) regularly in the horizontal direction (X direction). The five block structures are arranged regularly in the vertical direction (Y direction). In the block-shaped region 411 of the absorbent core 41A, as shown in FIG. 11, four of the six low basis weight portions 44Y extending in the vertical direction (Y direction) are respectively separated from the ventral side portion A. It is arranged linearly over the side part B.

  The block shape region 411 of the absorbent core 41B shown in FIG. 12 will be described more specifically. In the absorbent core 41B, as shown in FIG. 12, the back side portion 411b of the block-shaped region 411 has a high basis weight portion 43 partitioned by low basis weight portions 44 (44X, 44Y) regularly in the lateral direction. Four block structures arranged in the (X direction) are regularly arranged in four rows in the vertical direction (Y direction). In addition, as shown in FIG. 12, the crotch part 411c of the block-shaped region 411 includes three high basis weight portions 43 partitioned by low basis weight portions 44 (44X, 44Y) in the lateral direction (X direction). Individually arranged block structures are regularly arranged in seven rows in the vertical direction (Y direction). In addition, as shown in FIG. 12, the ventral side portion 411a of the block-shaped region 411 has a high basis weight portion 43 partitioned by low basis weight portions 44 (44X, 44Y) regularly in the lateral direction (X direction). Four block structures are regularly arranged in four rows in the vertical direction (Y direction). In the block shape region 411 of the absorbent core 41B, as shown in FIG. 12, the low basis weight portion 44Y extending in any longitudinal direction (Y direction) is also linear from the ventral side A to the back side B. Not arranged.

  The block shape region 411 of the absorbent core 41C shown in FIG. 13 will be described more specifically. In the absorbent core 41 </ b> C, as shown in FIG. 13, the back side portion 411 b of the block-shaped region 411 has a high basis weight portion 43 partitioned by low basis weight portions 44 (44 </ b> X, 44 </ b> Y) regularly in the lateral direction. Five block structures arranged in the (X direction) are regularly arranged in three rows in the vertical direction (Y direction), and four high basis weight portions 43 are regularly arranged in the horizontal direction (X direction). The block structure is regularly arranged in one row in the vertical direction (Y direction). Moreover, as shown in FIG. 13, the crotch part 411c of the block-shaped area | region 411 has the high basic weight part 43 divided by the low basic weight part 44 (44X, 44Y) regularly 3 in a horizontal direction (X direction). Individually arranged block structures are regularly arranged in seven rows in the vertical direction (Y direction). Further, as shown in FIG. 13, the ventral portion 411a of the block-shaped region 411 has a high basis weight portion 43 partitioned by low basis weight portions 44 (44X, 44Y) regularly in the lateral direction (X direction). A block structure in which four block structures are regularly arranged in the vertical direction (Y direction), and five high basis weight portions 43 are regularly arranged in the horizontal direction (X direction). Three rows are regularly arranged in the vertical direction (Y direction). In the block shape region 411 of the absorbent core 41C, as shown in FIG. 13, the low basis weight portion 44Y extending in any longitudinal direction (Y direction) is also linear from the ventral side A to the back side B. Not arranged.

  The block shape region 411 of the absorbent core 41D shown in FIG. 14 will be described more specifically. In the absorbent core 41D, as shown in FIG. 14, the back side portion 411b of the block-shaped region 411 has a high basis weight portion 43 partitioned by low basis weight portions 44 (44X, 44Y) regularly in the lateral direction. Six block structures arranged in the (X direction) are regularly arranged in three rows in the vertical direction (Y direction), and four high basis weight portions 43 are regularly arranged in the horizontal direction (X direction). The block structure is regularly arranged in one row in the vertical direction (Y direction). Moreover, as shown in FIG. 14, the crotch part 411c of the block-shaped area | region 411 has the high basic weight part 43 divided by the low basic weight part 44 (44X, 44Y) regularly in a horizontal direction (X direction). Individually arranged block structures are regularly arranged in seven rows in the vertical direction (Y direction). Further, as shown in FIG. 14, the ventral portion 411a of the block-shaped region 411 has a high basis weight portion 43 partitioned by low basis weight portions 44 (44X, 44Y) regularly in the lateral direction (X direction). A block structure in which four block structures are regularly arranged in the vertical direction (Y direction), and six high basis weight portions 43 are regularly arranged in the horizontal direction (X direction). Three rows are regularly arranged in the vertical direction (Y direction). In the block-shaped region 411 of the absorbent core 41D, as shown in FIG. 14, three of the seven low basis weight portions 44Y extending in the vertical direction (Y direction) are respectively separated from the ventral side portion A. It is arranged linearly over the side part B.

  Moreover, in the disposable diaper 1 of the above-mentioned embodiment, as shown in FIG. 1, the low basic weight part 44 of the absorptive core 41 which comprises the absorber 4 has the linear low shape extended in a horizontal direction (X direction). Although the basis weight portion 44X and the linear low basis weight portion 44Y extending in the vertical direction (Y direction) are formed in a lattice shape as a whole, the shape is not limited to the lattice shape.

  Moreover, although the disposable diaper 1 of the above-mentioned embodiment is a deployment-type disposable diaper, as shown in FIG. 1, a pants-type disposable diaper may be sufficient.

The following absorbent articles are disclosed regarding the embodiment described above.
<1> An absorbent article comprising a top sheet disposed on the skin facing surface side, a back sheet disposed on the non-skin facing surface side, and a vertically long absorbent disposed between the two sheets. ,
The surface sheet has a large number of raised portions on the skin facing surface side and a recess portion adjacent to the raised portion, the skin facing surface side of the surface sheet has a undulation, and the non-skin facing surface side is flat. And
The absorbent body has an absorbent core containing an absorbent polymer and a covering material surrounding the absorbent core,
The absorptive core has a relatively high basis weight and convex portions on both sides of the back sheet, and a relatively low basis weight adjacent to the high basis weight part from the back sheet side to the top sheet. The absorbent article which has a low basic weight part dented toward the side, this high basic weight part and this low basic weight part are integrally molded, and the skin opposing surface side is flat.

<2> The top sheet is composed of a first layer and a second layer of a sheet-like material, and the first layer and the second layer constitute a skin facing surface and a non-skin facing surface of the top sheet, respectively. The first layer is raised on the skin-facing surface side to form a large number of the raised portions having a hollow inside, and the recessed portion is formed between the raised portions, and the second layer is a flat surface The absorbent article according to <1>, wherein the absorbent article is in the shape of a circle.
<3> The surface sheet is made of a fiber assembly, and the inside of the raised portion is solid, and the raised portion and the recessed portion extend in the vertical direction and are alternately arranged in the horizontal direction. The absorbent article as described in <1>.
<4> The skin-side coating material on the skin-facing surface side in the coating material and the flat skin-facing surface of the absorbent core are fixed via a skin-side absorbent core adhesive, and the non-skin-facing surface in the coating material The non-skin-side covering material on the side and the non-skin facing surface of the absorbent core are fixed via a non-skin-side absorbent core adhesive,
The skin-side absorbent core adhesive is coated in a long spiral shape in the longitudinal direction of the absorbent article,
The absorption according to any one of <1> to <3>, wherein the non-skin-side absorbent core adhesive is applied intermittently in a horizontal direction of the absorbent article and in a straight line in a vertical direction. Sex goods.
<5> The coating area ratio of the skin-side absorbent core adhesive is lower than the coating area ratio of the non-skin-side absorbent core adhesive, according to any one of <1> to <4>. Absorbent article.
<6> The absorbent article according to any one of <1> to <5>, wherein the non-skin-side coating material enters a dent of the low basis weight portion with respect to the absorbent core.
<7> The skin side covering material and the sheet on the surface sheet side are fixed via a skin side absorbent adhesive,
The non-skin side covering material and the back sheet are fixed via a non-skin side absorbent adhesive,
The skin-side absorbent adhesive is applied in a long spiral shape in the longitudinal direction of the absorbent article,
The absorbent article according to any one of <1> to <6>, wherein the non-skin-side absorbent adhesive is applied intermittently in a lateral direction and in a straight line in the longitudinal direction of the absorbent article. .
<8> In the absorbent core, the high basis weight portion and the low basis weight portion are alternately arranged in parallel in the horizontal direction.
At least one of the skin-side absorbent core adhesive and the skin-side absorbent adhesive applied in a spiral shape intersects at a plurality of points on the low basis weight portion as described in <1> to <6>. The absorbent article of any one.
<9> The absorbent article according to any one of <1> to <8>, wherein the back sheet enters a recess of the low basis weight portion with respect to the absorbent core.
<10> The skin-side absorbent core adhesive and / or the non-skin-side absorbent core adhesive are coated in a long omega (Ω) shape in the longitudinal direction of the absorbent article. The absorbent article according to any one of 9>.

<11> The surface sheet is any one of the items <2> and <4> to <10>, in which the first layer and the second layer are bonded to each other through a bonding portion in the hollow portion. Absorbent article as described in 1.
<12> In the top sheet, the raised portion is surrounded by the hollow portion having the four joint portions, the bottom surface is rectangular in plan view, and the raised portion has a rounded ridgeline as a whole. The absorbent article according to <11>, wherein the absorbent article is a flat rectangular parallelepiped or truncated quadrangular pyramid.
<13> When the top sheet is viewed in plan from the first layer side, the joint portions are arranged in a staggered pattern, and the raised portions are also arranged in a staggered pattern <11> or The absorbent article as described in <12>.
<14> The first layer and the second layer are formed of a sheet-like material, and the sheet-like material is non-stretchable. The material of the sheet-like material is a nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a spunlace. Various non-woven fabrics such as non-woven fabrics and needle punched non-woven fabrics, and films that are liquid permeable by opening means can also be used. When using non-woven fabric as the sheet material, the fineness of the constituent fibers is 1 dtex or more and 20 dtex or less Or the absorbent article according to any one of the above items <2> to <13>, which is 1.5 dtex or more and 5.6 dtex or less.
<15> The <1> to <14>, wherein the absorbent body is formed by coating the absorbent core having a long liquid retention property with the coating material that is a liquid-permeable hydrophilic sheet. The absorbent article according to any one of 1.
<16> The high basis weight part and the low basis weight part are integrally molded, and the absorbent core has a concavo-convex structure on the non-skin facing surface side of the absorbent core. The absorbent article according to any one of 15>.
<17> The low basis weight portion includes a linear low basis weight portion extending in the horizontal direction and a linear low basis weight portion extending in the vertical direction, and the linear low basis weight portion extending in the horizontal direction. The length in the vertical direction is shorter than the length in the vertical direction of the high basis weight portion, and the length of the linear low basis weight portion extending in the horizontal direction is the length of the high basis weight portion. The absorbent article according to any one of <1> to <16>, wherein the length is 3% to 20%.
<18> The high basis weight portion is formed in a rectangular shape in a plan view, is formed in a rectangular shape that is long in the vertical direction, has four corners in an arc shape, or has a polygonal shape, an ellipse, Alternatively, the absorbent article according to any one of <1> to <17>, which is a combination thereof.
<19> The <1> to <18, in which the basis weight of the low basis weight part is 20% to 80% or less than 30% to 70% of the basis weight of the high basis weight part. > Any one of>.
<20> The absorbent core includes a block-shaped region including the low basis weight portion arranged in a lattice shape and a high basis weight portion arranged in a portion partitioned by the low basis weight portion, and the block An outer peripheral region disposed over the outer periphery of the shape region, and in the absorber, the high basis weight portion and the outer peripheral region are substantially the same or higher in density than the low basis weight portion. <1> to <18, wherein the low basis weight part has a density of 50% or more and 100% or less or 75% or more and 95% or less of the density of the high basis weight part. > Any one of>.

<21> The coating area ratio of the skin-side absorbent core adhesive is 2% or more and 40% or less, or 5% or more and 20% or less, and the non-skin-side absorbent core adhesive The absorbent article according to <5>, wherein the coating area ratio of the coating is 20% or more and 100% or less, or 30% or more and 80% or less.
<22> Using one sheet of the covering material, the both sides of the covering material are folded back, and the side edges of the covering material are overlapped on the back sheet side of the absorbent core. The absorbent article according to any one of the above items <1> to <21>.
<23> The skin side covering member and the surface sheet are fixed via a skin side absorbent adhesive, and there is no other sheet between the surface sheet and the skin side covering member, and the skin side The absorbent article according to any one of <7> to <22>, wherein the topsheet is directly disposed on the covering member.
<24> The absorbent article according to any one of <1> to <23>, wherein the absorbent article is a deployable disposable diaper.
<25> The absorbent article according to any one of <1> to <23>, wherein the absorbent article is a pants-type disposable diaper.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited by the examples.

[Example 1]
The absorber 4 was manufactured using the apparatus shown in FIG. 5, and the disposable diaper 1 shown in FIG. 1 was produced. When it explains in full detail about the surface sheet 2, the protruding part 21 and the junction part 25 (dent part 22) are distribute | arranged to the staggered lattice shape, the height h of the protruding part 21 is 3 mm, and the protruding part 21 along a Y direction The bottom portion dimension L1 of the ridge portion was 3 mm, the bottom portion dimension L2 of the ridge portion 21 along the X direction was 3 mm, and the bottom area of the ridge portion 21 was 9 mm ² . Further, the length L3 in the X direction and the length in the Y direction of the joint portion 25 of the hollow portion 22 were 1 mm. The first layer 23 constituting the surface sheet 2, the fineness of the constituent fiber consists air-through nonwoven 2.2～4.4Dtex, the basis weight was 18 g / m ^2. Moreover, the 2nd layer 24 which comprises the surface sheet 2 consists of an air through nonwoven fabric whose fineness of a constituent fiber is 2.3 dtex, The basis weight was 18 g / m < ² >.

Next, the absorber 4 will be described in detail. The absorbent core 41 has a total length in the Y direction of 370 mm and a total width in the X direction of 120 mm. Further, the block-shaped region 411 of the absorbent core 41 had a total length in the Y direction of 330 mm and a total width in the X direction of 50 mm. The outer peripheral region 412 of the absorbent core 41 has a Y-direction length in the Y direction of 20 mm, a side of the ventral side A in the X-direction has a length of 35 mm, and the side of the crotch C The length in the X direction was 10 mm, and the length in the X direction of the side portion of the back side portion B was 25 mm. The width L4 of the low basis weight portion 44X constituting the block shape region 411 was 2 mm, and the width L5 of the low basis weight portion 44Y was 2 mm. The length L6 in the Y direction of the high basis weight portion 43 constituting the block shape region 411 was 20 mm, and the length L7 in the X direction was 10 mm. The basis weight of the low basis weight portion 44 (44X, 44Y) constituting the block shape region 411 is 260 g / m ² , and the basis weight of each of the high basis weight portion 43 and the outer peripheral region 412 constituting the block shape region 411 is 470 g. / M ² . Moreover, the thickness of the low basic weight part 44 (44X, 44Y) which comprises the block shape area | region 411 is 2.2 mm, and the thickness of the high basic weight part 43 which comprises the block shape area | region 411, and each outer periphery area | region 412 is 4 mm. there were. Moreover, the density of the low basic weight part 44 (44X, 44Y) which comprises the block-shaped area | region 411 is 0.12 g / cm < ³ >, and each density of the high basic weight part 43 which comprises the block-shaped area | region 411, and the outer periphery area | region 412 Was 0.12 g / cm ³ .

  Next, the adhesive 5 will be described in detail. The coated area ratio of the skin-side absorbent core adhesive 51T coated in a spiral shape is 10%, and the non-skin-side absorbent core coated in a stripe shape. The coating area ratio of the adhesive 51U was 50%.

[Comparative Example 1]
The disposable diaper of the comparative example 1 was produced like Example 1 except having arrange | positioned so that the non-skin opposing surface side might become the structure which has an uneven | corrugated surface sheet 2, and the skin opposing surface side might become flat.

[Comparative Example 2]
A disposable diaper of Comparative Example 2 was produced in the same manner as in Example 1 except that the absorbent core 41 of the absorbent body 4 was arranged so that the topsheet 2 side was an uneven structure and the backsheet 3 side was flat.

[Comparative Example 3]
With respect to the top sheet 2, the non-skin facing surface side has a undulating structure and the skin facing surface side is flat, and the absorbent core 41 of the absorbent body 4 has a concavo-convex structure on the top sheet 2 side and the back sheet 3 side is flat. A disposable diaper of Comparative Example 3 was produced in the same manner as in Example 1 except that the diaper was arranged so as to be.

[Performance evaluation]
About the disposable diaper of Example 1 and Comparative Examples 1-3, according to the following method, the curvature at the time of wear and the air permeability at the time of wear were evaluated. The evaluation environment was a room temperature of 20 ° C. and a humidity of 60% RH. The results are shown in Table 1 below.

[Curability when worn]
About the disposable diaper obtained in Example 1 and Comparative Examples 1 to 3, a dimension of 39 mm in the vertical direction (Y direction) and 70 mm in the horizontal direction (X direction) so as to correspond to the block shape region 411 of the absorbent core 41. Cut out with. Using the Taber Stiffness Tester (Part No. 2048-D) manufactured by Kumagai Riki Kogyo Co., Ltd., the sample cut out in this way is bent at a constant speed (180 ° ± 40 ° / min) at a bending moment of 15 ° (gf Cm) was measured. The measurement was performed by bending in the left and right directions in the X direction, measuring three samples for each diaper, obtaining the average value of the measured values, and shown in Table 1.

[Breathability before excretion]
About the disposable diaper obtained in Example 1 and Comparative Example 2, an acrylic plate (175 mm long, horizontal) having a hole (inner diameter 8 mm) in the center so as to correspond to the center position of the block-shaped region 411 of the absorbent core 41 80 mm), a central hole and the tip of a cylindrical tube (syringe) are connected by a silicon tube, and an injection tube (product number 2-5636-10 manufactured by Tsubaki Kogyo Co., Ltd.) is set up vertically. Next, a weight is placed on the acrylic plate so that a load of 3.5 kPa is applied. Next, air was supplied by the weight of the movable pusher (plunger), and the time (seconds) until 200 cc of air passed was measured. In addition, three samples were measured for each diaper, and the average value of the measured values was determined and shown in Table 1.

[Breathability after excretion]
About the disposable diaper obtained in Example 1 and Comparative Example 2, on the surface sheet 2 corresponding to the center position of the block-shaped region 411 of the absorbent core 41, physiological saline (0.9 wt% sodium chloride water) was added. Supply 40 g and leave for 10 minutes. Then, it measured similarly to the air permeability before excretion, and shown in Table 1.

  As is clear from the results shown in Table 1, it was found that the disposable diaper of Example 1 had a lower bending moment in the X direction and higher curvature when worn compared to the disposable diapers of Comparative Examples 1 to 3. . Moreover, the disposable diaper of Example 1 compared with the disposable diaper of Example 1 and the disposable diaper of Comparative Example 2 provided with the surface sheet 2 in which the skin facing surface side has a undulating structure and the non-skin facing surface side is flat. Compared with the disposable diaper of the comparative example 2, it turned out that especially the air permeability after excretion is high. Thus, according to the disposable diaper of Example 1 with high air permeability after excretion, it can be expected that the touchability is also improved.

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 21 Raised part 22 Indented part 23 1st layer, 24 2nd layer 25 Joint part 3 Back surface sheet 4 Absorber 41 Absorbent core 41T Absorbent core 41 flat skin opposing surface 41U Absorbent core 41 Non-skin facing surface of concavo-convex structure of 411 Block shape region 412 Outer peripheral region 42 Coating material 421 Skin-side coating material 422 Non-skin-side coating material 43 High basis weight portion 44 Low basis weight portion 44X A linear shape extending in the lateral direction (X direction) Low basis weight part 44Y Linear low basis weight part 5 extending in the longitudinal direction (Y direction) Adhesive 51T Skin-side absorbent core adhesive 51U Non-skin-side absorbent core adhesive 5T Skin-side absorbent adhesive 5U Skin side absorbent adhesive 6 Three-dimensional gather 61 Three-dimensional gather forming elastic member 62 Three-dimensional gather forming sheet 63 Leg elastic member 64 Waist elastic member 7 Fastening tape 8 Run Ing tape 9 space 10 adhesive 45 absorbent material 46 deposit 49 absorber precursor 50 rotating drum 51 drum recess 52 mesh plate 53 breathable member 54,55 region 60 duct 65 vacuum box 70 transfer roll 75 mesh belt 80 vacuum Conveyor 90 Pressurizing means A ventral side, B dorsal side, C crotch CL centerline extending in the vertical direction of the diaper

Claims (9)

An absorbent article comprising a top sheet disposed on the skin facing surface side, a back sheet disposed on the non-skin facing surface side, and a vertically long absorbent disposed between both the sheets,
The surface sheet has a large number of bulges raised on the skin-facing surface side and depressions adjacent to the bulging portion, the skin-facing surface side of the surface sheet has a undulation, and the non-skin-facing surface side is flat. And
The absorbent body has an absorbent core containing an absorbent polymer and a covering material surrounding the absorbent core,
The absorbent core has a relatively high basis weight and a convex high basis weight part on the back sheet side, and a relatively low basis weight adjacent to the high basis weight part from the back sheet side to the top sheet. A low basis weight portion that is recessed toward the side, and the high basis weight portion and the low basis weight portion are integrally formed from the same material so that they cannot be separated from each other, and the skin facing surface side is Flat,
In the absorbent core, the high basis weight portion and the low basis weight portion are alternately arranged in parallel in the lateral direction,
The skin-side absorbent core adhesive that fixes the skin-side coating material on the skin-facing surface side of the coating material and the flat skin-facing surface of the absorbent core, and the skin-side coating material and the topsheet are fixed. The skin-side absorbent adhesive is disposed in a spiral shape that is long in the longitudinal direction of the absorbent article and intermittently in the lateral direction, and the skin-side absorbent core adhesive and the skin-side absorbent body that are disposed in a spiral shape. At least one of the adhesives is an absorbent article in which a plurality of points intersect on the low basis weight portion.   The top sheet is composed of a first layer and a second layer of sheet-like materials, and the first layer and the second layer constitute a skin facing surface and a non-skin facing surface of the top sheet, respectively. Is formed on the skin-facing surface side, and a plurality of the raised portions having a hollow inside are formed, and the recessed portion is formed between the raised portions, and the second layer is planar. The absorbent article according to claim 1.   The said surface sheet consists of a fiber assembly, and the inside of the said protruding part is solid, The said protruding part and the said hollow part are extended in the vertical direction, respectively, and are arranged in parallel with the horizontal direction alternately. Absorbent article as described in 1.   The non-skin-side absorbent core adhesive that fixes the non-skin-side coating material on the non-skin-facing surface side of the coating material and the non-skin-facing surface of the concavo-convex structure of the absorbent core is in the lateral direction of the absorbent article. The absorbent article according to any one of claims 1 to 3, wherein the absorbent article is intermittently arranged in a straight line in the vertical direction.   The absorbent article according to claim 4, wherein a coating area ratio of the skin-side absorbent core adhesive is lower than a coating area ratio of the non-skin-side absorbent core adhesive.   The absorptive article according to claim 4 or 5 in which said non-skin side covering material has entered a dent of said low basic weight part to said absorptive core.   The non-skin-side absorbent adhesive for fixing the non-skin-side covering material and the back sheet is disposed intermittently in a horizontal direction and in a straight line in the vertical direction of the absorbent article. The absorbent article according to any one of the above.   The absorbent article according to any one of claims 1 to 7, wherein the back sheet enters a dent of the low basis weight portion with respect to the absorbent core. The absorbent article according to any one of claims 4 to 7 , wherein the non-skin-side absorbent core adhesive is arranged in an omega (Ω) shape that is long in a longitudinal direction of the absorbent article.

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