JP2019165875A - Absorbent article - Google Patents

Abstract

To provide an absorbent article capable of suppressing the occurrence of wetback.SOLUTION: A plurality of projections are provided in at least one of a top sheet 13 (center sheet 15, diffusion sheet 14, skin-contact surface side cover member 19, fiber layer 20) having liquid permeability and laminated at a skin-contact surface side of an absorbent core 18, and hydrophilic property is set to be higher in the order of the top sheet 13 laminated from a skin-contact surface side to a skin non-contact surface side. With this, liquid quickly penetrates from a skin-contact surface side to a skin non-contact surface side at the time of liquid absorption, and liquid can be temporarily held in a space S formed between the projections when an amount of liquid penetrating into the top sheet 13 is large. In wetback, a path width of wetback is narrowed, a path length is made long, and hydrophilic property of the top sheet 13 is set so as to suppress the occurrence of wetback.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an absorbent article provided with an absorber.

  Absorbent articles, such as disposable diapers (hereinafter simply referred to as “diapers”), which allow discharged body fluid (hereinafter simply referred to as “liquid”) to be absorbed by an absorber are widely known. The absorbent body is provided with an absorbent core composed of a fiber material (such as pulp) and a super absorbent polymer (super “absorbent polymer”, simply referred to as “SAP”), and the absorbent core is required to absorb liquid efficiently. It has been.

  Thus, for example, Patent Document 1 discloses that a liquid is removed from a surface sheet by laminating a surface sheet (a covering member and a center sheet) on the skin contact surface side of the absorbent core so as not to generate a gap. An absorbent article that is efficiently absorbed is disclosed.

JP 2014-144050 A

  However, in the absorbent article described in the cited document 1, due to the wearer's movement or the like, a state in which the direction of gravity is directed from the absorbent core to the topsheet, or pressure or the like is applied to the topsheet and the absorbent core. In this state, there is a possibility that a so-called wet-back phenomenon occurs in which the liquid held in the absorbent core returns to the skin contact surface side outside of the absorbent core. This gave the wearer a moist feeling and made him feel uncomfortable.

  Then, the objective of this invention is providing the absorbent article which can suppress generation | occurrence | production of wet back.

  In order to solve the above problems, an absorbent article according to the present invention is a liquid composed of an absorbent core having an absorbent resin and one or more layers laminated on the skin contact surface side of the absorbent core. A surface sheet that is permeable, and at least one of the surface sheets has a plurality of protrusions protruding toward the absorbent core, and the protrusions of the surface sheet are on the non-skin contact surface side Is in contact with the sheet adjoining only at the top of the convex portion.

  Moreover, the said absorbent article WHEREIN: The said convex part of the said surface sheet is good also as what is substantially point contact or line contact with the sheet | seat adjacent to the non-skin contact surface side.

  Further, the absorbent article may be characterized in that the hydrophilicity of the topsheet adjacent to the non-skin contact surface that contacts the convex portion is higher than the hydrophilicity of the convex portion.

  Further, the absorbent article has a plurality of the top sheets having the plurality of convex portions, and is arranged so that the convex portions of the top surface sheets in the vicinity do not overlap when the top sheet is viewed in plan. It is good also as what is characterized by being made.

  Further, the absorbent article has a cross-sectional shape perpendicular to the top sheet of the convex portion, any of a semi-elliptical shape, a semi-circular shape, a triangular shape, a funnel shape, and a trapezoidal shape such that the top portion is thinner than the base portion of the convex portion. It is good also as what is characterized by being one.

  Moreover, the said absorbent article is good also as what is provided with the said some convex part as a linear shape or a point shape on the said surface sheet provided with the said convex part.

  Moreover, the said absorbent article is provided on the said surface sheet provided with the said convex part as the arrangement pattern in any one of the linear shape, the grid | lattice form, the zigzag form, and the radial form in which several said convex parts are arranged in parallel. It is good also as what is characterized by having.

  According to the absorbent article of the present invention, an absorbent article that can suppress the occurrence of wetback can be provided.

It is the perspective view seen from the front side which shows an example of the diaper which concerns on one Embodiment of this invention. It is the typical top view which looked at the expansion | extension state of the diaper shown by FIG. 1 from the center sheet | seat side. It is a disassembled perspective view of the diaper shown by FIG. It is sectional drawing cut | disconnected by the IV-IV sectional line which shows the absorber in the back body area | region of FIG. FIG. 5 is a schematic diagram in which a cross-sectional shape of a circle V portion in FIG. 4 is enlarged, and is a diagram for explaining a liquid absorption path. It is sectional drawing cut | disconnected by the VI-VI sectional line which shows one Embodiment of the absorber in the crotch area | region of FIG. It is sectional drawing which shows another embodiment of the absorber in the crotch area | region of FIG. It is sectional drawing which shows another embodiment of the absorber in the crotch area | region of FIG. It is a top view which shows the shape and arrangement | sequence pattern of a convex part provided in a center sheet | seat, (a) The linear shape paralleled to the vertical direction, (b) The linear shape paralleled to the horizontal direction, (c) Grid shape, (d) Dotted lines arranged in a staggered manner in the vertical direction, (e) Straight lines arranged in the oblique direction, (f) Oblique lattice shapes, (g) Dotted lines arranged in the staggered direction, (h) Arranged radially Examples of linear shapes, (i) point shapes arranged vertically and horizontally, (j) point shapes arranged in a staggered manner, (k) point shapes arranged in parallel along an oblique direction, and (l) point shapes arranged radially. FIG.

  Embodiments of the present invention will be described in detail with reference to FIGS. However, the present invention is not limited to the aspect of the present embodiment.

<Outline of diapers>
FIG. 1 is a perspective view seen from the front side showing an example of a diaper according to an embodiment of the present invention, and FIG. 2 is a schematic view showing a developed state of the diaper shown in FIG. 1 seen from the center seat side. FIG. 3 is an exploded perspective view of the diaper shown in FIG. 2. Here, about the center sheet | seat 15 of FIG. 2, the three-dimensional gather 16, and the coating | coated member 19 of FIG.

  As shown in FIG. 1, an unfolded disposable diaper will be described as an example of a diaper according to this embodiment. The diaper 10 includes a front body region 10F, a back body region 10R, and a crotch region 10C that connects the front body region 10F and the back body region 10R. Moreover, the waist periphery opening part 10W which surrounds a wearer's waist part with the front body area | region 10F and the back body area | region 10R at the time of wear is formed. Similarly, a pair of left and right leg openings 10L that surround the thighs of the wearer's legs are formed by the lower ends of the front body region 10F and the back body region 10R and the crotch region 10C.

  When the diaper 10 is worn, the front body region 10F is located on the wearer's belly side, and the back body region 10R is located on the wearer's back side. The crotch region 10C covers the wearer's crotch when worn, and the wearer's legs are respectively passed through the pair of left and right leg openings 10L. Therefore, the leg-hole opening 10L is located anywhere from the base of the wearer's legs to around the thigh.

  The diaper 10 includes a cover sheet 11 provided so as to cover the crotch region 10C and the front body region 10F and the back body region 10R, and a pair of left and right fastenings bonded to the left and right edge portions of the back body region 10R of the cover sheet 11. A tape 10A and a front patch sheet 10B bonded to the front body region 10F of the cover sheet 11 are further provided. Fastening tape 10A is releasably joined to front patch sheet 10B, and in this joined state, leg opening 10L and waist opening 10W are formed.

  The imaginary line P extends from the abdominal side to the back side through the crotch part in the central part of the diaper. Specifically, for example, if the imaginary line P is defined with the waist side of the diaper as the upper side and the crotch side as the lower side, the phantom line P extends along the diaper surface and in the vertical direction, and passes through the crotch part on the back side. Also extends in the vertical direction.

  As shown in FIGS. 2 and 3, the diaper 10 includes, in order from the outside, a cover sheet 11 formed of a thin non-woven fabric to obtain a good touch, a back sheet 12 having liquid impermeability, and non-skin The contact member 19 on the contact surface side, the absorbent core 18, the cover member 19 (surface sheet 13) having liquid permeability on the skin contact surface side, and the diffusion sheet 14 (surface sheet 13) having liquid permeability. And a liquid-permeable center sheet 15 (surface sheet 13) and a pair of three-dimensional gathers 16 made of a hydrophobic sheet member are stacked. Here, the “surface sheet” is defined as a sheet having liquid permeability that is laminated on the skin contact surface side of the absorbent core 18 and configured by one or a plurality of layers. In the present embodiment, The center sheet 15, the diffusion sheet 14, the skin contact surface side covering member 19, and the fiber layer 20 (see FIG. 8) are included.

  The cover sheet 11 is formed with a pair of notches 11N serving as leg openings 10L on both the left and right sides of the crotch region 10C. Between the cover sheet 11 and a pair of three-dimensional gathers 16 to be described later, a pair of rubber threads 21 for forming a leg gather is bonded in an extended state.

  The back sheet 12 is bonded to the cover sheet 11 on one side and is bonded to the center sheet 15 via the covering member 19, the absorbent core 18 and the diffusion sheet 14 on the other side. Further, in the backsheet 12, an area corresponding to the upper end portion of the back body area 10 </ b> R extends along the width direction of the backsheet 12, and is elastic for giving a wearer an appropriate wearing feeling around the waist. Sheet 10D is joined.

  The absorbent body 17 has a mat shape in which an absorbent core 18 and a fiber layer 20 (see FIG. 8) are wrapped with a covering member 19 such as tissue or nonwoven fabric. In addition, in the diaper 10 which concerns on this embodiment, although the absorber 17 wrapped with the coating | coated member 19 is used, the absorbent article which concerns on this invention absorbs the absorbent core 17 which is not wrapped with the coating | coated member 19. It may be used as the body 17.

  The absorptive core 18 is composed of pulp and SAP dispersedly arranged in the pulp. Here, the absorptive core 18 includes one containing 100% of SAP and is composed of one or more layers.

  The fiber layer 20 (surface sheet 13) (see FIG. 8) is composed of only fiber materials (pulp, tissue, etc.) without SAP and has liquid permeability, and is provided at least in the crotch region 10C in the front-rear direction. The left and right directions are provided so as to overlap the absorbent core 18. Moreover, the fiber layer 20 is laminated | stacked on the skin contact surface side of the absorptive core 18, and has several convex part 20D which protrudes in the absorptive core 18 side. You may form convex part 20D to the edge part of the front-back direction of the fiber layer 20, and the left-right direction. The shape of the convex portion 20 </ b> D can include various shapes such as a linear shape or a point shape on the fiber layer 20. Also, the cross-sectional shape of the convex portion 20D has various cross-sectional shapes such as a semi-elliptical shape, a semi-circular shape, a triangular shape, a funnel shape, and a trapezoidal shape such that the top portion 20DT (see FIG. 8) is thinner than the base portion 20DB of the convex portion 20D. Can be included.

  The covering member 19 (surface sheet 13) has liquid permeability and wraps the absorbent core 18 and the fiber layer 20. The seam formed by wrapping the absorbent core 18 with the covering member 19 is, for example, on the upper surface of the absorber 17 in the front-rear direction (extending direction of the imaginary line P in FIG. 2) as shown in FIG. It is formed to extend. The absorber 17 of the present embodiment has an elongated shape so as to cover the front body region 10F, the crotch region 10C, and the back body region 10R. Here, when the direction orthogonal to the front-rear direction (the extending direction of the imaginary line P in FIG. 2) is the left-right direction, the absorbent body 17 of the present embodiment has a rectangular shape with different front-rear left-right lengths (FIG. 2 and FIG. 3, the front and rear lengths are longer than the left and right lengths).

  In addition, the shape of the absorber 17 of this embodiment is not restricted to this, For example, the substantially square thing of the length of the front and back, right and left is the same, the thing by which the corner | angular of the front and rear ends is rounded, and the elliptical shape extended to the front and rear Includes various shapes such as round and round. Moreover, a pair of notch parts which make | form arc shape may be formed in the crotch part of the absorber 17 so as to correspond to a pair of leg periphery opening part 10L. Further, the covering member 19 of the present embodiment wraps the absorbent core 18, but is not limited to this, and the two covering members 19 on the skin contact surface side and the non-skin contact surface side absorb the absorbency. It may be one that sandwiches the core 18.

  The diffusion sheet 14 (surface sheet 13) has liquid permeability, and is provided so that the front-rear direction is at least in the crotch region 10C and the left-right direction is overlapped with the absorbent core 18. Moreover, the diffusion sheet 14 has a plurality of convex portions 14D that protrude toward the absorbent core 18 side. The convex portion 14 </ b> D may be formed up to the ends of the diffusion sheet 14 in the front-rear direction and the left-right direction. The shape of the convex portion 14 </ b> D can include various shapes such as a linear shape or a point shape on the diffusion sheet 14. Further, the cross-sectional shape of the convex portion 14D has various cross-sectional shapes such as a semi-elliptical shape, a semi-circular shape, a triangular shape, a funnel shape, and a trapezoidal shape such that the top portion 14DT (see FIG. 6) is narrower than the base portion 14DB of the convex portion 14D. Can be included.

  The center sheet 15 (surface sheet 13) has liquid permeability and has a plurality of convex portions 15D protruding toward the absorbent core 18 side. The convex portion 15 </ b> D is not formed up to the end portions in the front-rear direction and the left-right direction of the center sheet 15. The shape of the convex portion 15 </ b> D can include various shapes such as a linear shape or a point shape on the center sheet 15. Further, the cross-sectional shape of the convex portion 15D is various, such as a semi-elliptical shape, a semi-circular shape, a triangular shape, a funnel shape, and a trapezoidal shape such that the top portion 15DT (see FIGS. 4 and 5) is thinner than the base portion 15DB of the convex portion 15D. Various cross-sectional shapes.

  The pair of three-dimensional gathers 16 are provided along the front-rear direction of the absorbent core 18, and one side edge portion of the side edges extending in the front-rear direction of the absorbent core 18 has a substantially straight shape, and the other side. At the edge, a notch 16N is formed near the crotch. The inner portions of the pair of three-dimensional gathers 16 are not joined to the center sheet 15, and the three-dimensional gathers 16 include free ends at their substantially linear side edges. At this free end, a rubber thread 22, which is an elastic member that acts on a tensile force, is disposed in an extended state along the front-rear direction of the absorbent core 18. The pair of three-dimensional gathers 16 can stand up along both side edges of the absorbent core 18 in a worn state by the rubber thread 22.

  In the present embodiment, “hydrophilicity” refers to the property of a small contact angle between the liquid surface and the solid surface, and generally refers to a property smaller than 90 °. Moreover, desired hydrophilicity can be given to the center sheet 15, the diffusion sheet 14, the covering member 19, and the fiber layer 20 by performing a hydrophilic treatment. On the other hand, “hydrophobic” refers to the property of a large contact angle between the liquid surface and the solid surface, and generally refers to a property greater than 90 °.

  Next, details of the absorption path for absorbing liquid from the center sheet 15 to the absorbent core 18 in the front body region 10F and the back body region 10R of the present embodiment will be described. Here, the white arrow in FIG. 5 indicates the liquid absorption path.

<Absorption path of front body area and back body area>
4 is a cross-sectional view of the diaper according to the present embodiment cut along an IV-IV cross-sectional line showing the absorber in the back body region of FIG. 2, and FIG. 5 is an enlarged cross-sectional shape of a circle V portion in FIG. FIG. Here, since the absorbent body in the front body region 10F also has the same cross-sectional view, illustration is omitted here.

  As shown in FIG. 4, the absorption path | route laminated | stacked in order of the surface sheet 13 (the center sheet | seat 15, the skin contact surface side coating | coated member 19), and the absorptive core 18 is formed. The center sheet 15 is formed with a plurality of protrusions 15D protruding toward the absorbent core 18 by intermittent embossing, and a connection portion 15C that connects the protrusions 15D between the plurality of protrusions 15D. Has been. As shown in FIG. 5, the cross-sectional shape of the convex portion 15D is a semicircular shape in which the top portion 15DT is thinner than the base portion 15DB of the convex portion 15D.

  Here, with respect to the laminated structure of the top sheet 13 (center sheet 15 and skin contact surface side covering member 19) and the absorbent core 18, first, the top of the convex portion 15D of the center sheet 15 in order from the skin contact surface side. Only 15DT makes contact with the covering member 19 on the skin contact surface side (strictly speaking, it becomes surface contact, but is substantially point contact or line contact), and then the skin contact surface side covering member 19 absorbs. It is laminated so as to be in continuous contact with the conductive core 18 on the entire surface. Here, when adjoining the surface sheets 13 are performed by applying a hot melt adhesive, the amount of the hot melt adhesive used here is the minimum at which the surface sheets 13 are not peeled off. Use quantity. Thereby, the part to which the hot melt adhesive is applied is prevented from impeding the liquid permeability. The hydrophilicity of the top sheet 13 is such that the hydrophilicity increases in the order of the center sheet 15 and the covering member 19 on the skin contact surface side, that is, from the skin contact surface side to the non-skin contact surface side. It is set so that liquid can penetrate quickly.

  In addition, although the means which forms the some convex part 15D of the center sheet | seat 15 of this embodiment uses intermittent embossing, it is not restricted to this, For example, by giving a folding process to the center sheet | seat 15, The planar shape may be an accordion shape, the mountain folded portion protruding to the absorbent core 18 side of the center sheet 15 may be a convex portion 15D, and the valley folded portion may be a connecting portion 15C. Moreover, although the laminated structure of this embodiment is used for the front body region 10F and the back body region 10R, it is not limited thereto, and may be used for the crotch region 10C, for example.

  In a state where the wearer wears a diaper, the liquid is guided onto the center sheet 15 by a pair of three-dimensional gathers 16 formed of a hydrophobic sheet member (see FIG. 4). Next, the liquid guided onto the center sheet 15 penetrates into the center sheet 15 as in the liquid absorption path (white arrow) shown in FIG. 5, and through the base portion 15DB of the convex portion 15D, It penetrates also into the top 15DT of the convex portion 15D. Here, when there is much liquid which permeate | transmits the center sheet | seat 15, a liquid is temporarily hold | maintained in the space S formed between convex part 15D and convex part 15D. Subsequently, since the hydrophilicity of the covering member 19 on the skin contact surface side is set higher than the hydrophilicity of the top portion 15DT of the convex portion 15D, the liquid passes through the top portion 15DT of the convex portion 15D. It quickly penetrates into the covering member 19 on the contact surface side. The liquid that has permeated the covering member 19 on the skin contact surface side is absorbed by the fiber material in the absorbent core 18 and is effectively captured by the highly liquid-capturing SAP.

  In the present embodiment, the liquid guided onto the center sheet 15 permeates the covering member 19 on the skin contact surface side through the top portion 15DT of the convex portion 15D having a narrow absorption path. Here, when there is a lot of liquid penetrating the center sheet 15, the liquid is temporarily held in the space S, and the liquid penetrates into the covering member 19 on the skin contact surface side as time passes. Therefore, although the surface sheet 13 has a narrow absorption path, the surface sheet 13 can rapidly infiltrate the liquid from above the surface sheet 13. In addition, air can pass through the front body region 10F and the back body region 10R through the space S, and air permeability can be ensured.

  In a state where the direction of gravity is directed from the absorbent core 18 to the topsheet 13 or a pressure is applied to the topsheet 13 and the absorbent core 18 due to the movement of the wearer or the like, the absorbent core 18 is held. The liquid that has been applied tends to wet back to the center sheet 15 via the top 15DT of the convex portion 15D that is directly joined to the covering member 19 on the skin contact surface side. However, the covering member 19 on the skin contact surface side is substantially in point contact or line contact with the center sheet 15. As a result, the width of the path for wetback can be narrowed, the path length can be increased, and the occurrence of wetback can be suppressed. Moreover, since the hydrophilicity is set in the order of the top sheet 13 laminated from the skin contact surface side to the non-skin contact surface side, the occurrence of wetback can be further suppressed.

  Next, details of the absorption path through which the liquid in the crotch region 10C of the present embodiment is absorbed into the absorbent core 18 via the center sheet 15, the diffusion sheet 14, and the skin contact surface side covering member 19 will be described.

<Absorption route of inseam area>
6 is a cross-sectional view taken along the line VI-VI showing an embodiment of the absorbent body in the crotch region of FIG.

  In the crotch region 10 </ b> C, an absorption path is formed in which the top sheet 13 (center sheet 15, diffusion sheet 14, skin contact surface side covering member 19) and absorbent core 18 are laminated in this order. Since the center sheet 15 in the crotch region 10C has the same configuration as the center sheet 15 in the front body region and the back body region described above, description thereof is omitted. The diffusion sheet 14 includes a plurality of convex portions 14D protruding toward the absorbent core 18 by intermittent embossing, and a connecting portion 14C that connects the convex portions 14D between the plurality of convex portions 14D. Is formed. The cross-sectional shape of the convex portion 14D is a semicircular shape in which the top portion 14DT is thinner than the base portion 14DB of the convex portion 14D.

  Here, with respect to the laminated structure of the top sheet 13 (center sheet 15, diffusion sheet 14, skin contact surface side covering member 19) and absorbent core 18, first, the convexity of the center sheet 15 is sequentially started from the skin contact surface side. Only the top portion 15DT of the portion 15D comes into contact (substantially point contact or line contact) with the connecting portion 14C of the diffusion sheet 14, and then only the top portion 14DT of the convex portion 14D of the diffusion sheet 14 covers the skin contact surface side. The covering member 19 on the skin contact surface side is in contact with the member 19 (substantially point contact or line contact), and is laminated so as to continuously contact the absorbent core 18 over the entire surface. Here, when adjoining the surface sheets 13, as described above, the hot melt adhesive is applied. The hydrophilicity of the surface sheet 13 is such that the hydrophilicity increases in the order of the center sheet 15, the diffusion sheet 14, and the covering member 19 on the skin contact surface side, that is, from the skin contact surface side to the non-skin contact surface. It is set so that liquid can permeate quickly to the surface side. Furthermore, in the laminated structure of the present embodiment, when the topsheet 13 is viewed in plan (see FIG. 2), the convex portion 15D of the center sheet 15 and the convex portion 14D of the diffusion sheet 14 are arranged so as not to overlap.

  The means for forming the plurality of convex portions 14D of the diffusion sheet 14 of the present embodiment uses intermittent embossing, but is not limited to this, and for example, the diffusion sheet 14 is subjected to the above-described folding process. May be. Further, the laminated structure of the present embodiment is used in the crotch region 10C, but is not limited thereto, and may be used in the front body region 10F and the back body region 10R, for example.

  In a state where the wearer wears a diaper, the amount of liquid in the crotch region 10C is larger than in the above-described front body region and back body region. This liquid is guided onto the center sheet 15 by a pair of three-dimensional gathers 16 formed of a hydrophobic sheet member. Next, the liquid guided onto the center sheet 15 penetrates into the center sheet 15 and also penetrates into the top portion 15DT of the convex portion 15D through the base portion 15DB of the convex portion 15D. Here, when there is much liquid which permeate | transmits the center sheet | seat 15, a liquid is temporarily hold | maintained in the space S formed between convex part 15D and convex part 15D. Subsequently, since the hydrophilicity of the diffusion sheet 14 is set higher than the hydrophilicity of the top portion 15DT of the convex portion 15D, the liquid quickly penetrates into the diffusion sheet 14 through the top portion 15DT of the convex portion 15D. To do. Furthermore, the liquid guided onto the diffusion sheet 14 penetrates into the diffusion sheet 14 and also penetrates the top portion 14DT of the convex portion 14D through the base portion 14DB of the convex portion 14D. Here, when there is much liquid which permeate | transmits the diffusion sheet 14, a liquid is temporarily hold | maintained in the space S formed between convex part 14D and convex part 14D. Subsequently, since the hydrophilicity of the covering member 19 on the skin contact surface side is set higher than the hydrophilicity of the top portion 14DT of the convex portion 14D, the liquid passes through the top portion 14DT of the convex portion 14D. It quickly penetrates into the covering member 19 on the contact surface side. The liquid that has permeated the covering member 19 on the skin contact surface side is absorbed by the fiber material in the absorbent core 18 and is effectively captured by the highly liquid-capturing SAP.

  In the present embodiment, the liquid guided onto the center sheet 15 penetrates into the absorbent core 18 through the top 15DT of the convex portion 15D having a narrow absorption path and the top 14DT of the convex portion 14D. Here, when there is a lot of liquid penetrating the center sheet 15, the liquid is temporarily held in the space S formed between the convex portions 15 </ b> D and the convex portions 15 </ b> D. Will penetrate. Similarly, when there is a large amount of liquid penetrating the diffusion sheet 14, the liquid is temporarily held in the space S formed between the convex portions 14 </ b> D and 14 </ b> D. It penetrates into the covering member 19 on the surface side. Therefore, although the surface sheet 13 has a narrow absorption path, the surface sheet 13 can rapidly infiltrate the liquid from above the surface sheet 13. Furthermore, air can pass through the crotch region 10C through the space S formed between the convex portions 15D and 15D and the space S formed between the convex portions 14D and 14D. As a result, air permeability can be ensured.

  In a state where the direction of gravity is directed from the absorbent core 18 to the topsheet 13 or a pressure is applied to the topsheet 13 and the absorbent core 18 due to the movement of the wearer or the like, the absorbent core 18 is held. The liquid that has been applied is the top 14DT of the convex portion 14D of the diffusion sheet 14 directly bonded to the covering member 19 on the skin contact surface side and the top of the convex portion 15D of the center sheet 15 directly bonded to the connecting portion 14C of the diffusion sheet 14. It tries to generate a wet back to the center sheet 15 via 15DT. However, the contact member 19 and the diffusion sheet 14 on the skin contact surface side, and the diffusion sheet 14 and the center sheet 15 are substantially in point contact or line contact. As a result, the width of the wetback path can be narrowed, the path length can be increased, and the occurrence of wetback can be further suppressed. Moreover, since the hydrophilicity is set in the order of the top sheet 13 laminated from the skin contact surface side to the non-skin contact surface side, the occurrence of wetback can be further suppressed.

  In the present embodiment, in the crotch region, a laminate structure of the top sheet 13 (center sheet 15, diffusion sheet 14, skin contact surface side covering member 19) and the absorbent core 18 suppresses the occurrence of wet back. Although shown, the laminated structure (refer FIG. 7) of the surface sheet 13 (center sheet 15, skin contact surface side covering member 19) and the absorbent core 18, or the surface sheet 13 (center sheet 15, skin contact surface side) The covering member 19, the fiber layer 20), and the laminated structure of the absorbent core 18 (see FIG. 8) may suppress the occurrence of wetback.

  Next, details of the absorption path through which the liquid in the crotch region 10C of another embodiment is absorbed into the absorbent core 18 via the center sheet 15 will be described.

  FIG. 7 is a cross-sectional view showing another embodiment of the absorbent body in the crotch region of FIG.

  In the crotch region 10 </ b> C, an absorption path is formed in which the top sheet 13 (the center sheet 15 and the skin contact surface side covering member 19) and the absorbent core 18 are laminated in this order. Since the center sheet 15 in the crotch region 10C has the same configuration as the center sheet 15 in the front body region and the back body region described above, description thereof is omitted. Further, the covering member 19 on the skin contact surface side connects the protrusions 19D between the plurality of protrusions 19D protruding toward the absorbent core 18 and the plurality of protrusions 19D by intermittent embossing. The connecting portion 19C is formed. The cross-sectional shape of the convex portion 19D is a semicircular shape in which the top portion 19DT is thinner than the base portion 19DB of the convex portion 19D.

  Here, with respect to the laminated structure of the top sheet 13 (center sheet 15 and skin contact surface side covering member 19) and the absorbent core 18, first, the top of the convex portion 15D of the center sheet 15 in order from the skin contact surface side. Only 15DT makes contact (substantially point contact or line contact) with the connecting portion 19C of the covering member 19, and then only the top portion 19DT of the convex portion 19D of the covering member 19 on the skin contact surface side becomes the absorbent core 18. It is laminated so as to make contact (substantially point contact or line contact). Here, when adjoining the surface sheets 13, as described above, the hot melt adhesive is applied. The hydrophilicity of the top sheet 13 is such that the hydrophilicity increases in the order of the center sheet 15 and the covering member 19 on the skin contact surface side, that is, from the skin contact surface side to the non-skin contact surface side. It is set so that liquid can penetrate quickly. Furthermore, in the laminated structure of the present embodiment, when the topsheet 13 is viewed in plan (see FIG. 2), the convex portion 15D of the center sheet 15 and the convex portion 19D of the covering member 19 are arranged so as not to overlap.

  In addition, although the means which forms the some convex part 19D of the coating | coated member 19 of this embodiment uses intermittent embossing, it is not restricted to this, For example, in the coating | coated member 19 by the side of a skin contact surface, You may perform the above-mentioned folding process. Further, the covering member 19 of the present embodiment wraps the absorbent core 18, but is not limited to this, and the two covering members 19 on the skin contact surface side and the non-skin contact surface side absorb the absorbency. It may be one that sandwiches the core 18. Thus, only the covering member 19 on the skin contact surface side can be embossed and the alignment with the center sheet 15 can be appropriately performed. Furthermore, although the laminated structure of the present embodiment is used in the crotch region 10C, the present invention is not limited thereto, and may be used in the front body region 10F and the back body region 10R, for example.

  In a state where the wearer wears a diaper, the liquid is guided onto the center sheet 15 by a pair of three-dimensional gathers 16 formed of a hydrophobic sheet member. Next, the liquid guided onto the center sheet 15 penetrates into the center sheet 15 and also penetrates into the top portion 15DT of the convex portion 15D through the base portion 15DB of the convex portion 15D. Here, when there is much liquid which permeate | transmits the center sheet | seat 15, a liquid is temporarily hold | maintained in the space S formed between convex part 15D and convex part 15D. Subsequently, since the hydrophilicity of the covering member 19 on the skin contact surface side is set higher than the hydrophilicity of the top portion 15DT of the convex portion 15D, the liquid passes through the top portion 15DT of the convex portion 15D. It quickly penetrates into the covering member 19 on the contact surface side. Furthermore, the liquid guided onto the skin contact surface side covering member 19 penetrates into the skin contact surface side covering member 19 and, at the same time, the top portion 19DT of the convex portion 19D via the base portion 19DB of the convex portion 19D. Also penetrates. Here, when there is a lot of liquid penetrating the covering member 19 on the skin contact surface side, the liquid is temporarily held in the space S formed between the convex portions 19D and 19D. Subsequently, the liquid quickly permeates into the absorbent core 18 through the top 19DT of the convex portion 19D. The liquid that has penetrated into the absorbent core 18 is absorbed by the fiber material in the absorbent core 18 and is effectively captured by the highly liquid-capturing SAP.

  In the present embodiment, the liquid guided onto the center sheet 15 penetrates into the absorbent core 18 through the top portion 15DT of the convex portion 15D having a narrow absorption path and the top portion 19DT of the convex portion 19D. Here, when there is a large amount of liquid penetrating the center sheet 15, the liquid is temporarily held in the space S formed between the convex portion 15D and the convex portion 15D. It penetrates into the covering member 19 on the surface side. Similarly, when there is a lot of liquid penetrating the covering member 19 on the skin contact surface side, the liquid is temporarily held in the space S formed between the convex portion 19D and the convex portion 19D. The liquid will penetrate into the absorbent core 18. Therefore, although the surface sheet 13 has a narrow absorption path, the surface sheet 13 can rapidly infiltrate the liquid from above the surface sheet 13. Furthermore, air can pass through the crotch region 10C through the space S formed between the convex portions 15D and the convex portion 15D and the space S formed between the convex portions 19D and 19D. As a result, air permeability can be ensured.

  In a state where the direction of gravity is directed from the absorbent core 18 to the topsheet 13 or a pressure is applied to the topsheet 13 and the absorbent core 18 due to the movement of the wearer or the like, the absorbent core 18 is held. The liquid that has been used is the top portion 19DT of the convex portion 19D of the covering member 19 on the skin contact surface side directly bonded to the absorbent core 18 and the convex portion of the center sheet 15 directly bonded to the covering member 19 on the skin contact surface side. It tries to cause wet back to the center seat 15 via the top 15DT of 15D. However, between the absorbent core 18 and the skin contact surface side covering member 19 and between the skin contact surface side covering member 19 and the center sheet 15 are substantially point contact or line contact. As a result, the width of the path for wetback can be narrowed, the path length can be increased, and the occurrence of wetback can be suppressed. Moreover, since the hydrophilicity is set in the order of the top sheet 13 laminated from the skin contact surface side to the non-skin contact surface side, the occurrence of wetback can be further suppressed.

  FIG. 8 is a cross-sectional view showing still another embodiment of the absorbent body in the crotch region of FIG.

  In the crotch region 10 </ b> C, an absorption path is formed in which the top sheet 13 (center sheet 15, skin contact surface side covering member 19, fiber layer 20) and absorbent core 18 are laminated in this order. Since the center sheet 15 has the same configuration as the center sheet 15 in the front body region and the back body region described above, the description thereof is omitted. The fiber layer 20 includes a plurality of convex portions 20D protruding toward the absorbent core 18 by intermittent embossing, and a connecting portion 20C that connects the convex portions 20D between the plurality of convex portions 20D. Is formed. The cross-sectional shape of the convex portion 20D is a semicircular shape in which the top portion 20DT is thinner than the base portion 20DB of the convex portion 20D.

  Here, with respect to the laminated structure of the top sheet 13 (center sheet 15, skin contact surface side covering member 19, fiber layer 20) and absorbent core 18, first, the convexity of the center sheet 15 is sequentially started from the skin contact surface side. Only the top portion 15DT of the portion 15D comes into contact (substantially point contact or line contact) with the covering member 19 on the skin contact surface side, and then the covering member 19 on the skin contact surface side is continuous with the fiber layer 20 over the entire surface. Furthermore, it is laminated so that only the top portion 20DT of the convex portion 20D of the fiber layer 20 is in contact with the absorbent core 18 (substantially point contact or line contact). Here, when adjoining the surface sheets 13, as described above, the hot melt adhesive is applied. The hydrophilicity of the surface sheet 13 is such that the hydrophilicity increases in the order of the center sheet 15, the skin contact surface side covering member 19 and the fiber layer 20, that is, from the skin contact surface side to the non-skin contact surface. It is set so that liquid can permeate quickly to the surface side. Furthermore, in the laminated structure of the present embodiment, when the topsheet 13 is viewed in plan (see FIG. 2), the convex portion 15D of the center sheet 15 and the convex portion 20D of the fiber layer 20 are arranged so as not to overlap.

  The laminated structure of the present embodiment is used for the crotch region 10C, but is not limited thereto, and may be used for the front body region 10F and the back body region 10R, for example.

  In a state where the wearer wears a diaper, the liquid is guided onto the center sheet 15 by a pair of three-dimensional gathers 16 formed of a hydrophobic sheet member. Next, the liquid guided onto the center sheet 15 penetrates into the center sheet 15 and also penetrates into the top portion 15DT of the convex portion 15D through the base portion 15DB of the convex portion 15D. Here, when there is much liquid which permeate | transmits the center sheet | seat 15, a liquid is temporarily hold | maintained in the space S formed between convex part 15D and convex part 15D. Subsequently, since the hydrophilicity of the covering member 19 on the skin contact surface side is set higher than the hydrophilicity of the top portion 15DT of the convex portion 15D, the liquid passes through the top portion 15DT of the convex portion 15D. It quickly penetrates into the covering member 19 on the contact surface side. Further, the liquid guided onto the skin contact surface side covering member 19 penetrates into the skin contact surface side covering member 19 and the fiber layer 20, and the convex portion via the base 20DB of the convex portion 20D. It also penetrates the 20D top 20DT. Here, when there is a large amount of liquid penetrating the fiber layer 20, the liquid is temporarily held in the space S formed between the convex portions 20D and 20D. Subsequently, the liquid quickly penetrates into the absorbent core 18 through the top 20DT of the convex portion 20D. The liquid that has penetrated into the absorbent core 18 is absorbed by the fiber material in the absorbent core 18 and is effectively captured by the highly liquid-capturing SAP.

  In the present embodiment, the liquid guided onto the center sheet 15 penetrates into the absorbent core 18 through the top portion 15DT of the convex portion 15D having a narrow absorption path and the top portion 20DT of the convex portion 20D. Here, when there is a large amount of liquid penetrating the center sheet 15, the liquid is temporarily held in the space S formed between the convex portion 15D and the convex portion 15D. It penetrates into the covering member 19 on the surface side. Similarly, when there is a large amount of liquid penetrating the fiber layer 20, the liquid is temporarily held in the space S formed between the convex portion 20D and the convex portion 20D. 18 will penetrate. Therefore, although the surface sheet 13 has a narrow absorption path, the surface sheet 13 can rapidly infiltrate the liquid from above the surface sheet 13. Furthermore, air can pass through the crotch region 10C through the space S formed between the convex portions 15D and the convex portion 15D and the space S formed between the convex portions 19D and 19D. As a result, air permeability can be ensured.

  In a state where the direction of gravity is directed from the absorbent core 18 to the topsheet 13 or a pressure is applied to the topsheet 13 and the absorbent core 18 due to the movement of the wearer or the like, the absorbent core 18 is held. The liquid that has been made passes through the top portion 20DT of the convex portion 20D of the fiber layer 20 in contact with the absorbent core 18 and the top portion 15DT of the convex portion 15D of the center sheet 15 in contact with the covering member 19 on the skin contact surface side. Attempts to cause wet back to the center seat 15. However, between the absorbent core 18 and the fiber layer 20 and between the covering member 19 on the skin contact surface side and the center sheet 15 are substantially in point contact or line contact. As a result, the width of the path for wetback can be narrowed, the path length can be increased, and the occurrence of wetback can be suppressed. Moreover, since the hydrophilicity is set in the order of stacking from the skin contact surface side to the non-skin contact surface side, the occurrence of wetback can be further suppressed.

  Next, the arrangement pattern of the convex portions 15D, 14D, 19D, and 20D provided on each of the center sheet 15, the diffusion sheet 14, the covering member 19, and the fiber layer 20 quickly diffuses the liquid throughout the absorbent core 18. Efficient absorption will be described using the convex portion 15D of the center sheet 15 as an example.

<Convex pattern>
FIG. 9 is a plan view showing the shape and arrangement pattern of the convex portions 15 </ b> D provided on the center sheet 15. Here, the arrangement pattern of the protrusions 15 </ b> D provided on the center sheet 15 is not formed up to the front-rear direction (the extending direction of the virtual line P in FIG. 2) and the end in the left-right direction orthogonal to the front-rear direction. This is because the convex portion 15 </ b> D provided on the center sheet 15 diffuses the liquid to the end portions in the front-rear direction and the left-right direction of the absorbent core 18 to prevent leakage from the absorbent core 18.

  The shape of the plurality of convex portions 15D is provided as a linear shape as shown in FIGS. 9A to 9H, or as a point shape as shown in FIGS. 9I to 9L. Yes. Here, the linear shape is substantially a line contact with the covering member 19 (see FIGS. 4, 7, and 8) or the diffusion sheet 14 (see FIG. 6) on the skin contact surface side that contacts the convex portion 15D. As a result, the width of the liquid absorption path can be narrowed compared to the conventional surface contact, and the occurrence of liquid wetback can be suppressed. Similarly, the point shape is substantially point contact with the covering member 19 or the diffusion sheet 14 on the skin contact surface side in contact with the convex portion 15D, so that the width of the liquid absorption path is substantially compared with the line contact. Can be further narrowed, and the occurrence of liquid wetback can be further suppressed.

  Looking at the arrangement pattern of the convex portions 15D having a linear shape, FIG. 9 (a) is parallel to the vertical direction, FIG. 9 (b) is parallel to the horizontal direction, and FIG. ) Is a lattice shape, FIG. 9 (d) is a staggered arrangement in the vertical direction, FIG. 9 (e) is arranged in parallel in an oblique direction, and FIG. 9 (f) is 9 (g) is a staggered arrangement in the oblique direction, and FIG. 9 (h) is a radial arrangement. The liquid guided onto the center sheet 15 permeates the covering member 19 or the diffusion sheet 14 on the skin contact surface side through the top portion 15DT of the convex portion 15D having a narrow absorption path. At this time, if the arrangement pattern of the convex portions 15D is a linear shape arranged in parallel or radially in the vertical direction, the horizontal direction, and the diagonal direction, the liquid spreads along the linear shape of the convex portions 15D, and the convex shape By effectively utilizing the entire surface of the covering member 19 or the diffusion sheet 14 in contact with the portion 15D, the liquid can be permeated. Further, when there is a lot of liquid penetrating the center sheet 15, the liquid temporarily held in the space S (see FIGS. 5 to 8) formed between the convex portions 15D and 15D is While contacting and penetrating the convex portion 15D, it spreads along a linear shape. As described above, the liquid temporarily held in the space S permeates one after another into the peripheral convex portion 15D, so that the entire surface of the covering member 19 or the diffusion sheet 14 on the skin contact surface side is effectively used. can do. Furthermore, by adjusting the interval between the adjacent linear shapes, the area of the absorption path through which the liquid permeates can be secured, and the occurrence of liquid wetback can be suppressed.

  Looking at the arrangement pattern of the convex portions 15D having a dot shape, FIG. 9 (i) is arranged vertically and horizontally, FIG. 9 (j) is arranged staggered, and FIG. 9 (k) is along the oblique direction. These are arranged in parallel, and are arranged radially in FIG. 9 (l). The liquid guided onto the center sheet 15 permeates the covering member 19 or the diffusion sheet 14 on the skin contact surface side through the top portion 15DT of the convex portion 15D having a narrow absorption path. Further, when there is a large amount of liquid penetrating the center sheet 15, the liquid spreads so as to draw a radius around the convex portion 15D, and temporarily enters the space S formed between the convex portion 15D and the convex portion 15D. Retained. The liquid contacts and permeates the peripheral convex portion 15D and spreads so as to draw a radius around the newly permeated convex portion 15D. As described above, since the liquid temporarily held in the space S permeates one after another into the peripheral convex portion 15D, the arrangement pattern of the convex portions 15D is arranged in a vertical direction, a horizontal direction, an oblique direction, or a radial shape. If it is in the shape of a point arranged in the liquid, the liquid spreads with the directionality in which the point shape is arranged, and the entire surface of the covering member 19 or the diffusion sheet 14 can be used effectively. Furthermore, by adjusting the interval between adjacent point shapes, the area of the absorption path through which the liquid permeates can be secured, and the occurrence of liquid wetback can be suppressed.

  Here, the arrangement pattern of the convex portions 14D, 19D, and 20D provided on the diffusion sheet 14, the skin contact surface side covering member 19 and the fiber layer 20 is also the same as the arrangement pattern of the convex portions 15D provided on the center sheet 15. Patterns can be employed. However, since the absorptive core 18 covered with the diffusion sheet 14 further extends in the front-rear direction of the diffusion sheet 14 and the fiber layer 20, the arrangement pattern of the convex portions 14 </ b> D and the convex portions 20 </ b> D is the end portion in the front-rear direction. May be formed.

  In addition, although the shape of the convex part 15D of this embodiment has shown the linear shape or the point shape, it is not restricted to this, For example, as a shape which carries out a line contact substantially, a curve shape, a wave shape, and substantial As the point contact shape, a polygon such as a triangle, a star shape, or a combination of these shapes may be used. In addition, the arrangement pattern of the protrusions 15D is shown as being arranged in parallel or radially in the vertical direction, the horizontal direction, and the diagonal direction, but is not limited to this, for example, concentric circular shapes, or these arrangement patterns A combination of these may be used.

  Moreover, in this embodiment, the surface sheet 13 is the center sheet 15 and the skin contact surface side coating member 19, or the center sheet 15, the skin contact surface side coating member 19 and the other surface sheet 13 (diffusion sheet). 14 or any one of the fiber layers 20) is shown, but not limited thereto, the topsheet 13 having liquid permeability laminated on the skin contact surface side of the absorbent core 18 is At least one sheet or a plurality of sheets may be used. Moreover, the convex part which the surface sheet 13 (the center sheet | seat 15, the diffusion sheet 14, the skin contact surface side coating | coated member 19, and the fiber layer 20) has only the center sheet | seat 15 or the center sheet | seat 15 and the other surface sheet | seat 13 is. What is provided on the diffusion sheet 14 (any one of the covering member 19 on the skin contact surface side and the fiber layer 20) is shown, but not limited to this, on the skin contact surface side of the absorbent core 18 It may be provided on any one of the laminated surface sheets 13 having liquid permeability, or may be provided on a plurality of sheets. Here, when providing a convex part in the several surface sheet 13, it is preferable to arrange | position so that the convex part provided in the nearby surface sheet 13 may not overlap in planar view.

  Further, in the present embodiment, the surface sheet 13 (center sheet 15, diffusion sheet 14, skin contact surface side covering member 19 and fiber layer 20) has a convex portion, thereby narrowing the width of the wet back path. Although the thing which lengthens a path | route length is shown, it is not restricted to this, You may provide an unevenness | corrugation in the absorbent core 18 side of the surface sheet 13. FIG.

10 Diaper 10A Fastening tape 10B Front patch sheet 10F Front body area 10R Rear body area 10C Inseam area 10W Waist opening 10L Leg opening 11 Cover sheet 11N, 16N Notch 12 Back sheet 13 Top sheet 14 Diffusion sheet (surface Sheet)
14C Diffusion sheet connection 14D Diffusion sheet projection 14DT Diffusion sheet projection top 14DB Diffusion sheet projection base 15 Center sheet (surface sheet)
15C Center sheet connecting part 15D Center sheet convex part 15DT Center sheet convex part top 15DB Center sheet convex part base 16 Solid gather 17 Absorber 18 Absorbent core (absorber)
19 Covering member (surface sheet)
19C Connecting part 19D of the covering member 19D of the covering member 19DT Top part of the protruding part of the covering member 19DB Base 20 of the protruding part of the covering member Fiber layer (surface sheet)
20C Fiber layer connecting portion 20D Fiber layer convex portion 20DT Fiber layer convex portion top 20DB Fiber layer convex portion bases 21, 22 Thread rubber S Space

Claims (7)

An absorbent core having an absorbent resin;
Laminated on the skin contact surface side of the absorbent core, and a liquid-permeable surface sheet composed of one or more layers;
An absorbent article comprising:
At least one of the top sheets has a plurality of protrusions protruding toward the absorbent core,
The said convex part of the said surface sheet is contacting the sheet | seat adjacent to the non-skin contact surface side, and the top of the said convex part only, The absorbent article characterized by the above-mentioned.   The absorbent article according to claim 1, wherein the convex portion of the surface sheet is substantially in point contact or line contact with a sheet adjacent to the non-skin contact surface side.   The absorbent article according to claim 1 or 2, wherein the hydrophilicity of the topsheet adjacent to the non-skin contact surface side in contact with the convex portion is higher than the hydrophilicity of the convex portion. A plurality of the top sheets have a plurality of the convex portions,
The absorptivity according to any one of claims 1 to 3, wherein when the surface sheet is viewed in plan, the convex portions of the nearby surface sheet are arranged so as not to overlap each other. Goods.   The cross-sectional shape of the convex portion orthogonal to the top sheet is any one of a semi-elliptical shape, a semi-circular shape, a triangular shape, a funnel shape, and a trapezoidal shape such that the top is thinner than the base portion of the convex portion. The absorbent article according to any one of claims 1 to 4.   The absorbent article according to any one of claims 1 to 5, wherein a plurality of the convex portions are provided as a linear shape or a dot shape on the top sheet including the convex portions. .   The plurality of convex portions are provided on the topsheet having the convex portions as any one of an array pattern of a linear shape, a lattice shape, a staggered shape, and a radial shape arranged in parallel. 6. The absorbent article according to 6.

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