JP2017202254A - Absorbent article - Google Patents

Abstract

To provide an absorbent article capable of stably holding a skin care agent in a surface sheet and improving the durability of the skin care effect.
An absorbent article includes a liquid-permeable top sheet. The topsheet 10A has a concavo-convex structure in which at least two types of convex portions 3 having different heights protruding toward the skin facing surface are dispersed in the in-plane direction. The skin care agent 4 is arranged on the top sheet 10A. Among the convex portions 3, the middle convex portion 31 having the second highest height after the highest high convex portion 32 has a compression work larger than that of the high convex portion 32. The amount of the skin care agent 4 is greater at the top of the middle convex portion 31 than at the top of the high convex portion 32.
[Selection] Figure 1

Description

  The present invention relates to an absorbent article such as a sanitary napkin.

  Conventionally, an absorbent article in which a skin care agent is contained in a surface sheet having a concavo-convex structure in order to reduce skin troubles such as rash is known (for example, Patent Document 1). Patent Document 1 describes an absorbent article having a surface sheet with a concavo-convex structure having a plurality of convex portions of one type and having a higher content of the skin care agent in the convex portion than the content of the skin care agent in the concave portion. Has been.

  As a technique different from the above technique, the present applicant has previously proposed a surface sheet for absorbent articles in which two types of convex portions having different heights are dispersed in the in-plane direction of the sheet (for example, Patent Documents). 2).

JP2012-055409A JP 2011-015707 A

  If the absorbent article described in Patent Document 1 is worn, the height of the convex portion containing the skin care agent is only one kind, so the skin care agent will migrate to the wearer's skin early during wearing, Sustainability of the skin care effect is low, and skin troubles such as rash may occur.

  On the other hand, Patent Document 2 does not describe anything about the inclusion of a skin care agent, and does not describe anything about the positional relationship between the two types of convex portions and the skin care agent. Thus, the surface sheet for absorbent articles described in Patent Document 2 has room for further improvement.

  Therefore, the subject of this invention is providing the absorbent article which can eliminate the fault which the prior art mentioned above has.

  The present invention is an absorbent article that includes a liquid-permeable surface sheet, and has a longitudinal direction along a wearer's front-rear direction when worn, and a lateral direction perpendicular to the longitudinal direction. It is a non-woven fabric having a concavo-convex structure in which at least two types of convex portions having different heights protruding toward the facing surface are dispersed in the in-plane direction of the surface sheet, and a skin care agent is disposed on the surface sheet. Among the parts, the second convex part having the highest height after the first convex part having the highest height has a compression work larger than the compression work of the first convex part, and the amount of the skin care agent Provides an absorbent article in which the top of the second protrusion is more than the top of the first protrusion.

  ADVANTAGE OF THE INVENTION According to this invention, a skin care agent can be stably hold | maintained in a surface sheet, and the sustainability of a skin care effect improves.

FIG. 1 is an enlarged perspective view showing a main part of a top sheet of a preferred first embodiment provided in an absorbent article of the present invention. FIG. 2 is a plan view of the top sheet shown in FIG. 1 viewed from the skin facing surface side. FIG. 3 is a cross-sectional view schematically showing a cross section taken along line II of FIG. 4 is a cross-sectional view schematically showing a cross section taken along line II-II in FIG. FIG. 5 is a cross-sectional view schematically showing a cross section taken along line III-III in FIG. 6 is a cross-sectional view schematically showing a cross section taken along line IV-IV in FIG. FIG. 7 is a cross-sectional view schematically showing a cross section taken along line VV of FIG. FIG. 8: is the top view which looked at the surface sheet of preferable 2nd Embodiment with which the absorbent article of this invention is equipped from the skin opposing surface side (FIG. 2 equivalent view). 9 is a cross-sectional view schematically showing a cross section taken along line VI-VI in FIG.

The present invention will be described below based on preferred embodiments with reference to the drawings.
1 to 2 show a topsheet 10A that is a first embodiment of a topsheet provided in the absorbent article of the present invention. FIG. 1 is a perspective view schematically showing a main part of the top sheet 10A in a partial cross section, and FIG. 2 is a plan view of the top sheet 10A shown in FIG. 1 viewed from the skin facing surface side. The absorbent article of the present invention includes, for example, a liquid-permeable surface sheet 10A as shown in FIG. 1, and a longitudinal direction X along the wearer's front-rear direction when worn, and a transverse direction Y orthogonal to the longitudinal direction X. have. Here, the absorbent article is generally used for absorbing and holding excretory fluids such as urine, loose stool or menstrual blood. Absorbent articles include, for example, disposable diapers, sanitary napkins, incontinence pads, etc., but are not limited to these, and widely include articles used to absorb bodily fluids discharged from the human body. It is.

In the present specification, the longitudinal direction X of the absorbent article matches the longitudinal direction X of the topsheet 10A, and the transverse direction Y of the absorbent article matches the transverse direction Y of the topsheet 10A. And the longitudinal direction X of 10 A of surface sheets corresponds to MD direction along the alignment direction of this fiber seeing the main alignment direction of the constituent fiber of a nonwoven fabric, and the horizontal direction Y of 10 A of surface sheets is MD direction It coincides with the CD direction orthogonal to. Moreover, MD direction (X direction) is also a conveyance direction when manufacturing top sheet 10A.
Moreover, in this specification, a skin opposing surface means the surface turned to a wearer's skin side at the time of wear of an absorbent article in the absorbent article or its structural member (for example, surface sheet 10A), and non-skin opposing The surface means a surface of the absorbent article or a constituent member thereof (for example, the top sheet 10A) that is directed to the side opposite to the skin side (clothing side) when the absorbent article is worn.

  The absorbent article of the present invention typically has a liquid-permeable topsheet 10A that forms a skin-facing surface, a liquid-permeable or water-repellent backsheet that forms a non-skin-facing surface, and these sheets. And a liquid-retaining absorbent disposed between the two. In the absorbent article, a so-called sublayer sheet may be disposed on at least one of the skin facing surface and the non-skin facing surface of the absorbent body.

  As the back sheet and the absorber, materials usually used in the technical field can be used without particular limitation. For example, a liquid-permeable or water-repellent sheet such as a thermoplastic resin film or a laminate of the film and a nonwoven fabric can be used as the back sheet. The back sheet may have water vapor permeability. Further, as the absorbent body, for example, an absorbent core composed of a liquid absorbent fiber pile such as pulp fiber, or a mixed fiber bundle of liquid absorbent fibers and a water absorbent polymer, for example, tissue paper or water permeable What is formed by wrapping with a core wrap sheet made of a conductive nonwoven fabric can be used. Examples of the liquid-absorbing fibers include cellulose-based hydrophilic fibers such as pulp fibers, rayon fibers, cotton fibers, and cellulose acetate. In addition to cellulosic hydrophilic fibers, fibers made of a synthetic resin such as polyolefin, polyester, polyamide, etc., made hydrophilic with a surfactant or the like can also be used.

  Moreover, the absorbent article of the present invention may further include various members according to specific uses of the absorbent article. Such members are known to those skilled in the art. For example, when the absorbent article is applied to a disposable diaper or a sanitary napkin, a pair or two or more pairs are provided on the left and right sides along the longitudinal direction X on the topsheet 10A. A leak-proof cuff may be arranged.

  As shown in FIGS. 1 and 2, the topsheet 10A is a non-woven fabric having a concavo-convex structure in which at least two types of convex portions 3 projecting toward the skin facing surface are dispersed in the in-plane direction of the topsheet 10A. In the first embodiment, the three types of convex portions 3 having different heights, specifically, the concave-convex structure in which the middle convex portion 31, the high convex portion 32, and the low convex portion 33 are dispersed in the in-plane direction. I have. The high convex part 32 means the convex part 3 with the highest height, the low convex part 33 means the convex part 3 with the lowest height, the middle convex part 31 has a lower height than the high convex part 32, and The convex part 3 whose height is higher than the low convex part 33 is meant. That is, in the topsheet 10A of the first embodiment, the first convex portion having the highest height is the high convex portion 32, and the second convex portion having the second height next to the first convex portion is the middle convex portion 31. is there. The three types of convex portions 3 including the middle convex portion 31, the high convex portion 32, and the low convex portion 33 may be dispersed in the in-plane direction of the topsheet. However, in the topsheet 10A, as shown in FIG. Three types of convex portions 3 are dispersed in the in-plane direction of the topsheet 10A in a regular pattern.

  Skin care agent 4 is arranged on top sheet 10A. Preferably, in the top sheet 10A of the first embodiment, the skin care agent 4 is disposed on the skin facing surface side of the top sheet 10A, and the skin care agent 4 is disposed on the skin facing surface side of the non-heat-shrinkable fiber layer 1u described later. Has been.

  As shown in FIG. 1, the top sheet 10A of the first embodiment is a non-heat shrinkable fiber layer 1d containing heat-shrinkable heat-shrinkable fibers and non-heat-shrinkable fibers laminated on the heat-shrinkable fiber layer 1d. It is a sheet | seat comprised by the nonwoven fabric of 1 sheet in which the junction part 2 used as the some recessed part was formed. In the topsheet 10A, the non-heat-shrinkable fiber layer 1u is disposed on the skin contact surface side, and the heat-shrinkable fiber layer 1d is disposed on the non-skin contact surface side.

  In the topsheet 10A of the first embodiment, the heat-shrinkable fiber layer 1d and the non-heat-shrinkable fiber layer 1u are joined intermittently by a plurality of joints 2. In the joint portion 2, the constituent fibers of the heat-shrinkable fiber layer 1 d and the constituent fibers of the non-heat-shrinkable fiber layer 1 u are heat-sealed, and the fiber density of the joint portion 2 is higher than the fiber density of portions other than the joint portion 2. It has become. That is, in the joint portion 2 of the topsheet 10A, the constituent fibers are thermally fused and the fiber density is relatively high. Preferably, in the joint portion 2 of the topsheet 10A, as shown in FIG. 1, the constituent fibers of the topsheet 10A are consolidated, and the height (thickness) of the topsheet 1 compared to the unembossed portion. ) Is the lowest (thin). And the fiber density of the recessed part by the junction part 2 is higher than the part which is not joined, and is the highest in 10 A of surface sheets. Depending on the embossing conditions, the constituent fibers may be melted and solidified to form a film.

  In the topsheet 10A of the first embodiment, the heat-shrinkable fiber layer 1d and the non-heat-shrinkable fiber layer 1u are partially bonded and bonded together by a plurality of regularly arranged bonding portions 2, and non-skin The heat-shrinkable fiber of the heat-shrinkable fiber layer 1d on the contact surface side is heat-shrinked to form the convex portion 3. As shown in FIG. 1, the top sheet 10 </ b> A is embossed with joint portions 2 that are a plurality of recessed portions formed by embossing from the skin contact surface side of the non-heat-shrinkable fiber layer 1 u. A plurality of convex portions 3 are formed in a non-joined portion which is a non-embossed portion. And the convex part 3 becomes the solid structure where the inside was satisfy | filled with the constituent fiber, and in the surface sheet 10A of 1st Embodiment, any of the middle convex part 31, the high convex part 32, and the low convex part 33. The inside also has a solid structure filled with constituent fibers.

  Examples of the shape when the joint portion 2 is viewed in plan include an X shape, a Y shape, a rectangular shape, a polygonal shape, or a combination thereof. In the topsheet 10A of the first embodiment, as shown in FIG. When viewed from above, three rod-like bodies 20a, 20b, and 20c extend from the center point 21 in a so-called “Y-shaped” shape. The three rod-like bodies 20a and 20b in each joint portion 2 have the same length from the center point 21 in the surface sheet 10A, and the rod-like body 20c has the other two rod-like bodies 20a and 20a, The length is shorter than 20b. The rod-shaped body 20c among the three rod-shaped bodies 20a, 20b, and 20c is arranged in parallel to the vertical direction X in the topsheet 10A.

  In the topsheet 10A of the first embodiment, each joint portion 2 is provided separately and independently in the horizontal direction Y and the vertical direction X at regular intervals. The joints 2 and 2 adjacent to each other in the horizontal direction Y are arranged so as to be symmetric with respect to a virtual bisector ILx extending in parallel to the vertical direction X in plan view as shown in FIG. . The joints 2 and 2 adjacent to each other in the vertical direction X are arranged so as to be symmetric with respect to a virtual bisector ILy extending in parallel to the horizontal direction Y in plan view.

In the topsheet 10A of the first embodiment, each joint portion 2 has a density of 1 piece / cm ² or more, preferably from the viewpoint of improving the drawability and diffusibility of the liquid in the topsheet 10A and maintaining good touch. Is 2 pieces / cm ² or more and 32 pieces / cm ² or less, preferably 16 pieces / cm ² or less, more specifically 1 piece / cm ² or more and 32 pieces / cm ² or less. More preferably, it is 2 pieces / cm ² or more and 16 pieces / cm ² or less.

In the topsheet 10A of the first embodiment, as shown in FIG. 2, one of the two joints 2 and 2 that are adjacent to each other in the horizontal direction Y and are symmetrically arranged with respect to the virtual bisector ILx is joined. The rod-shaped body 20a included in the portion 2 and the rod-shaped body 20b included in the other joint portion 2 extend in an inclined manner in the same direction as viewed in plan.
Further, in the top sheet 10A of the first embodiment, as shown in FIG. 2, the two joint portions 2 and 2 that are adjacent to each other in the vertical direction X and are symmetrically arranged with respect to the virtual bisector ILy, The rod-like body 20a of one joint portion 2 and the rod-like body 20b of the other joint portion 2 are inclined and extend in the same direction as viewed in plan.

In the top sheet 10A of the first embodiment, the two long rod-like bodies 20a, 20b out of the three rod-like bodies 20a, 20b, 20c improve the liquid drawing and diffusibility in the top sheet 10A and are emotional. From the viewpoint of safety, the length is 0.5 mm or more, preferably 0.7 mm or more, and 5.0 mm or less, preferably 4.0 mm or less, more specifically 0.5 mm or more and 5.0 mm or less. It is preferable that it is 0.7 mm or more and 4.0 mm or less.
Further, the short rod-shaped body 20c is 0.2 mm or more, preferably 0.4 mm or more, and 4.8 mm from the viewpoint of improving the liquid drawing property and diffusibility in the top sheet 10A and improving the appearance impression. Hereinafter, it is preferably 4.5 mm or less, more specifically 0.2 mm or more and 4.8 mm or less, and more preferably 0.4 mm or more and 4.5 mm or less.
Each joint 2 has an area of one joint 2 of 1 mm ² or more, preferably 1.5 mm ² from the viewpoint of enhancing the drawability and diffusibility of the liquid in the topsheet 10A while maintaining a good touch. As described above, it is preferably 15 mm ² or less, preferably 12 mm ² or less, more specifically, 1 mm ² or more and 15 mm ² or less, more preferably 1.5 mm ² or more and 12 mm ² or less.

  As shown in FIG. 1, the top sheet 10 </ b> A according to the first embodiment includes a hemispherical high convex portion 32 having the highest height, a hemispherical low convex portion 33 having the lowest height, and a high convex portion 32. A plurality of hemispherical middle convex portions 31 having a height lower than that of the low convex portions 33 and a semi-cylindrical columnar convex portion 34 are provided.

  In the topsheet 10A of the first embodiment, as shown in FIG. 2, a plurality of middle convex portions 31 are arranged at intervals in the horizontal direction Y, and a plurality of middle convex portions 31 are arranged in the horizontal direction Y. A plurality of formed first protrusion rows 30La are arranged at intervals in the vertical direction X. Each middle convex portion 31 is surrounded by two joint portions 2 and 2. More specifically, in the middle convex portion 31 of the convex portion 3, the rod-like bodies 20 a and 20 b of the two joint portions 2 and 2 adjacent to each other in the longitudinal direction X face each other in plan view of the top sheet 10 </ b> A. Formed in the region. The middle convex portion 31 is regularly arranged in the horizontal direction Y and the vertical direction X, and has a three-dimensional dome structure surrounded by the long rod-like bodies 20a and 20b of the two joint portions 2 and 2, respectively. It is formed to be hemispherically raised on the skin contact surface side.

  In the topsheet 10A of the first embodiment, as shown in FIG. 2, a plurality of high convex portions 32 are arranged at intervals in the horizontal direction Y, and a plurality of high convex portions 32 are arranged in the horizontal direction Y. The formed second convex row 30Lb is arranged alternately with the first convex row 30La in the vertical direction X, and each high convex portion 32 is surrounded by four middle convex portions 31. Each high convex portion 32 is surrounded by four joint portions 2. More specifically, the high convex portion 32 of the convex portion 3 includes the two joining portions 2 adjacent to each other in the lateral direction Y in the plan view of the topsheet 10A, and the two joining portions 2 in the longitudinal direction. Long joints 20b and short joints 20c of four joints 2 each including two joints 2 adjacent to X are formed in regions facing each other. Or the high convex part 32 of the convex part 3 is formed in the area | region where the long rod-shaped body 20a and the short rod-shaped body 20c of each of the four junction parts 2 face each other. The high convex portions 32 are regularly arranged in the horizontal direction Y and the vertical direction X, and the three-dimensional dome structure surrounded by the rod-like bodies 20a and 20c or the rod-like bodies 20b and 20c of the four joint portions 2 respectively. It is formed to be hemispherically raised on the skin contact surface side.

  In the topsheet 10A of the first embodiment, as shown in FIG. 2, the low protrusions 33 are formed between the middle protrusions 31 adjacent in the horizontal direction Y and between the high protrusions 32 adjacent in the vertical direction X. It is arranged at intervals. Each low convex portion 33 is arranged at a position where the tips of the long rod-shaped bodies 20a in each of the four joint portions 2 or the tips of the long rod-shaped bodies 20b in each of the four joint portions 2 face each other. The low convex portions 33 are regularly arranged in the horizontal direction Y and the vertical direction X, and each of the four joint portions 2 has a three-dimensional dome structure surrounded by the distal ends of the rod-shaped bodies 20a or the rod-shaped bodies 20b. It is raised to the skin contact surface side and is formed in a hemispherical shape. As described above, the low convex portion 33 exists between the middle convex portions 31 adjacent to each other in the lateral direction Y, and the first convex portion row 30La is formed, so that the liquid drawing property is improved and good. Has the effect of maintaining a soft touch.

  In the topsheet 10A of the first embodiment, the columnar convex portions 34 are formed between the high convex portions 32 adjacent to each other in the horizontal direction Y and between the middle convex portions 31 adjacent to each other in the vertical direction X, as shown in FIG. It is arranged at intervals. Each columnar convex portion 34 is formed in a region where the tips of the short rod-like bodies 20c of the two joint portions 2 adjacent in the longitudinal direction X face each other. The columnar protrusions 34 are regularly arranged in the horizontal direction Y and the vertical direction X, and the skin contact surface side when viewed in cross section between the tips of the short rod-like bodies 20c of the two joint portions 2 respectively. The semi-arc-shaped ridge extends in the horizontal direction Y, and is formed in a semi-cylindrical shape that is long in the horizontal direction Y.

  In the topsheet 10A of the first embodiment, the height ha (see FIG. 4) at the apex of the middle convex portion 31 is 0.5 mm from the viewpoint of maintaining the touch of the topsheet and strengthening the fiber density gradient. Above, preferably 1.0 mm or more and 5.0 mm or less, preferably 3.0 mm or less, more specifically 0.5 mm or more and 5.0 mm or less, more preferably 1.0 mm or more and 3.0 mm or less. More preferably, it is as follows. The height ha of the middle convex portion 31 is also the height at the position corresponding to the center of gravity of the region where the rod-like bodies 20a, 20b of the two joint portions 2 adjacent to each other in the longitudinal direction X face each other. For the height ha, the height (thickness) of the cut surface when cut along the thickness direction Z using a feather razor (part number FAS-10, manufactured by Feather Safety Razor Co., Ltd.) was measured, and the average Find the value as height.

  In the top sheet 10A of the first embodiment, the height hb (see FIG. 3) at the apex of the high convex portion 32 improves the touch of the top sheet and enhances the density gradient of the fibers to enhance the liquid drawability. From the viewpoint of enhancing, it is preferably 1.0 mm or more, preferably 1.5 mm or more, and 7.0 mm or less, preferably 5.0 mm or less, more specifically 1.0 mm or more and 7.0 mm or less, More preferably, it is 1.5 mm or more and 5.0 mm or less. The height hb of the high convex portion 32 is a region where the rod-like bodies 20b, 20c of the four joint portions 2 face each other, or a region where the rod-like bodies 20a, 20c of the four joint portions 2 face each other. It is also the height at the position corresponding to the center of gravity. The height hb was measured by measuring the height (thickness) of the cut surface when cutting along the thickness direction Z using a feather razor (part number FAS-10, manufactured by Feather Safety Razor Co., Ltd.), and the average Find the value as height.

  In the top sheet 10A of the first embodiment, the height hc (see FIG. 3) at the apex of the low convex portion 33 improves the touch of the top sheet and reinforces the density gradient of the fibers to enhance the liquid drawability. From the viewpoint of increasing, it is preferably 0.4 mm or more, preferably 0.8 mm or more, and 4.5 mm or less, preferably 2.5 mm or less, more specifically 0.4 mm or more and 4.5 mm or less, More preferably, it is 0.8 mm or more and 2.5 mm or less. The height hc of the low convex portion 33 is a position corresponding to the center of gravity of the region where the tips of the rod-shaped bodies 20a in each of the four joint portions 2 or the tips of the rod-shaped bodies 20b in each of the four joint portions 2 face each other. It is also the height of. For the height hc, the height (thickness) of the cut surface when cut along the thickness direction Z using a feather razor (part number FAS-10, manufactured by Feather Safety Razor Co., Ltd.) was measured, and the average was obtained. Find the value as height.

  In the top sheet 10A of the first embodiment, the height hd (see FIG. 5) at the apex of the columnar protrusions 34 improves the touch of the top sheet and enhances the density gradient of the fibers, thereby enhancing the drawability of the liquid. From the viewpoint of increasing, it is preferably 0.4 mm or more, preferably 0.8 mm or more, and 4.5 mm or less, preferably 2.5 mm or less, more specifically 0.4 mm or more and 4.5 mm or less, More preferably, it is 0.8 mm or more and 2.5 mm or less. Thus, in the top sheet 10 </ b> A, the height hd at the apex of the columnar protrusion 34 is substantially the same as the height hc of the low protrusion 33. The height hd of the columnar convex portion 34 is also the height at a position corresponding to the center of gravity of the region where the rod-like bodies 20c, 20c of the two joint portions 2 adjacent in the longitudinal direction X face each other. Height hd measures the height (thickness) of the cut surface when it cuts along thickness direction Z using a feather razor (product number FAS-10, Feather safety razor Co., Ltd.), and the average Find the value as height.

  In the surface sheet 10 </ b> A, among the convex portions 3, the middle convex portion 31 having the second highest height after the highest high convex portion 32 has a compression work amount higher than that of the high convex portion 32. Largely, in the first embodiment, the compression work of the low convex portion 33 is larger than the compression work of the middle convex portion 31, and the compression work of the middle convex portion 31 is larger than the compression work of the high convex portion 32. ing.

The ratio (WCa / WCb) of the compression work WCa of the middle protrusion 31 to the compression work WCb of the high protrusion 32 is 1,5 times or more, preferably 2. 0 times or more and 10.0 times or less, preferably 5.0 times or less, more specifically 1.5 times or more and 10.0 times or less, more preferably 2.0 times or more and 5.0 times or less. It is more preferable that the ratio is not more than twice.
The ratio (WCc / WCa) of the compression work WCc of the low protrusions 33 to the compression work WCa of the middle protrusions 31 is 1.5 times or more, preferably 2. 0 times or more and 10.0 times or less, preferably 5.0 times or less, more specifically 1.5 times or more and 10.0 times or less, more preferably 2.0 times or more and 5.0 times or less. It is more preferable that the ratio is not more than twice.
Specifically, the compression work WCb of the high convex portion 32 is preferably 1.5 g · cm / cm ² or more and 3.0 g · cm / cm ² or less. The compression work WCa of the middle convex portion 31 is preferably 2.0 g · cm / cm ² or more and 4.5 g · cm / cm ² or less. Further, the compression work WCc of the low convex portion 33 is preferably 2.5 g · cm / cm ² or more and 7.5 g · cm / cm ² or less.
The compression work WCa of the middle protrusion 31, the compression work WCb of the high protrusion 32, and the compression work WCc of the low protrusion 33 can be measured using the methods described below.

尚、高凸部３２の圧縮仕事量ＷＣｂ、及び低凸部３３の圧縮仕事量ＷＣｃも同様にして測定する。 <Measurement of compression work of convex part 3>
The compression characteristics were measured using a Kato Tech KES-G5 handy compression tester. Specifically, one middle convex portion 31 is cut out from the top sheet 10A using a part number FAS-10 of Feather Safety Razor Co., Ltd. or other means and attached to the test bench. And the cut sample is calculated | required by compressing between the steel plates which have a circular plane with an area of 2 cm < ² >. The compression speed is 20 μm / sec, and the maximum compression load is 4.9 kPa. The recovery process is also measured at the same rate. The compression work WC (compression work WCa of the middle convex portion 31) is expressed by the following equation. Tm, T0 and P indicate respectively 4.9kPa (50gf / cm ²⁾ Thickness of time load, a load of 49Pa (0.5gf / cm ²⁾ when the thickness and measuring the time of loading.

In addition, the compression work WCb of the high convex part 32 and the compression work WCc of the low convex part 33 are measured similarly.

  In the topsheet 10A, among the convex portions 3, the middle convex portion 31 having the highest height after the highest high convex portion 32 has a fiber-to-fiber distance that constitutes the high convex portion 32. In the first embodiment, the inter-fiber distance of the fibers constituting the middle convex portion 31 is smaller than the inter-fiber distance of the fibers constituting the high convex portion 32, and the low convex portion 33 is constituted. The inter-fiber distance of the fibers is smaller than the inter-fiber distance of the fibers constituting the middle convex portion 31.

The ratio (Da / Db) of the inter-fiber distance Da of the fibers constituting the middle convex portion 31 to the inter-fiber distance Db of the fibers constituting the high convex portion 32 is 0. From the viewpoint of stably holding the skin care agent. 3 times or more, preferably 0.5 times or more, and 0.9 times or less, preferably 0.7 times or less, more specifically, preferably 0.3 times or more and 0.9 times or less, More preferably, they are 0.5 times or more and 0.7 times or less.
The ratio (Dc / Da) of the inter-fiber distance Dc of the fibers constituting the low convex portion 33 to the inter-fiber distance Da of the fibers constituting the middle convex portion 31 is 0. From the viewpoint of stably holding the skin care agent. 3 times or more, preferably 0.5 times or more, and 0.9 times or less, preferably 0.7 times or less, more specifically, preferably 0.3 times or more and 0.9 times or less, More preferably, they are 0.5 times or more and 0.7 times or less.
Specifically, the interfiber distance Db of the fibers constituting the high convex portion 32 is preferably 100 μm or more and 300 μm or less. The interfiber distance Da of the fibers constituting the middle convex portion 31 is preferably 90 μm or more and 250 μm or less. The interfiber distance Dc of the fibers constituting the low convex portion 33 is preferably 50 μm or more and 120 μm or less. The interfiber distance Da of the fibers constituting the middle convex portion 31 and the interfiber distance Db of the fibers constituting the high convex portion 32. And the interfiber distance Dc of the fiber which comprises the low convex part 33 can be measured using the method described below.

<Measurement of distance between fibers of fibers constituting convex part 3>
From the top sheet 10A, for example, a cutting surface passing through the top of one middle convex portion 31 is formed using a part number FAS-10 of Feather Safety Razor Co., Ltd. or other means. When cutting, a cross section is created so that the structure of the middle convex part 31 is not destroyed. In particular, it is preferable to cut the surface sheet 10A after it is sufficiently frozen by placing it in liquid nitrogen so that pressure is not applied to the middle convex portion 31 and the structure is not destroyed. Next, an electron microscope observation (SEM) is performed on the cross section of the middle convex portion 31, and a region to be measured is photographed. The SEM used is a JEOL electron microscope JCM-5100, which is sputtered for 30 seconds (Pt) under an acceleration voltage of 10 KV, and a cross section is photographed at an enlargement magnification of 500 to 1000 times. An image analysis device (NEWQUABE ver. 4.20 manufactured by NEXT) is used in the region where the number of fibers is 3 to 7 in the width direction (plane direction) of the image at each target measurement site of the enlarged photographed image of the middle convex portion 31. To find the distance between the nearest centers of gravity of the fibers. In the above measurement, the measurement is performed almost entirely in the thickness direction of the target part, and the closest distance between the centers of gravity is not caused to overlap. Moreover, the cross section of the middle convex part 31 measures at least 3 places of the surface sheet 10A, preferably 5 places, more preferably 10 places, and uses the average value. In this case, the distance between the nearest centers of gravity is used to calculate the interfiber distance.
In addition, the interfiber distance Db of the fiber which comprises the high convex part 32, and the interfiber distance Dc of the fiber which comprises the low convex part 33 are measured similarly.

In the topsheet 10A, the ratio of the bottom area of the high protrusion 32 to the bottom area of the middle protrusion 31 is preferably 2 or more from the viewpoint of clarifying the difference in the content of the skin care agent. More preferably, it is preferably 10 or less, more preferably 6 or less, specifically 2 or more and 10 or less, and more preferably 3 or more and 6 or less.
Specifically, the bottom area of the high convex portion 32 is preferably 35 mm ² or more and 100 mm ² or less. Further, the bottom area of the middle protrusion 31 is preferably 10 mm ² or more and 50 mm ² or less, and the bottom area of the middle protrusion 31 and the bottom area of the high protrusion 32 can be measured using the method described below. it can.

<Measurement of bottom area of convex part 3>
The bottom area of the middle convex portion 31 is such that the rod-like bodies 20a and 20b of the two joint portions 2 and 2 adjacent to each other in the vertical direction X face each other, and the tips of the rod-like bodies 20a and 20b adjacent to each other in the vertical direction X A region surrounded by the connecting straight line is obtained as the bottom area of the middle convex portion 31. Moreover, the bottom area of the high convex part 32 is four pieces which consist of the two junction parts 2 adjacent to the horizontal direction Y, and each of the two junction parts 2 and the two junction parts 2 adjacent to the vertical direction X. The long rod-shaped body 20b and the short rod-shaped body 20c of each of the joint portions 2 face each other, or the long rod-shaped body 20a and the short rod-shaped body 20c of each of the four joint portions 2 face each other and are adjacent to each other in the longitudinal direction X. The area surrounded by the straight line connecting the tips of the matching rod-like bodies 20c, 20c and the straight line connecting the tips of the rod-like bodies 20a, 20b adjacent in the horizontal direction Y is obtained as the bottom area of the high convex portion 32.

In the topsheet 10A, the ratio of the basis weight of the middle protrusion 31 to the basis weight of the high protrusion 32 is preferably 1.2 or more from the viewpoint of clarifying the difference in the content of the skin care agent. More preferably, it is 5 or more, preferably 4.0 or less, more preferably 2.5 or less, and specifically, preferably 1.2 or more and 4.0 or less. And more preferably 1.5 or more and 2.5 or less.
In the topsheet 10A, the ratio of the basis weight of the low convex portion 33 to the basis weight of the middle convex portion 31 is preferably 1.2 or more from the viewpoint of clarifying the difference in the content of the skin care agent. It is more preferably 1.5 or more, and preferably 4.0 or less, more preferably 2.5 or less, and specifically 1.2 or more and 4.0 or less. It is more preferable that it is 1.5 or more and 2.5 or less.
Specifically, the basis weight of the high convex portion 32 is preferably 20 g / m ² or more and 60 g / m ² or less. The basis weight of Chutotsu 31, 25 g / ^{m 2} or more 70 g / ^{m 2} or less. Further, the basis weight of the low convex portion 33 is preferably 30 g / m ² or more and 80 g / m ² or less.

  In the topsheet 10A, the fiber density of the high convex portion 32 of the three-dimensional dome structure is lower than the fiber density of each of the middle convex portion 31 and the low convex portion 33 of the three-dimensional dome structure. hb reference point) is the lowest among the high convex portions 32. The middle convex portion 31 of the three-dimensional dome structure has a fiber density lower than that of the low convex portion 33 of the three-dimensional dome structure, and the middle convex portion particularly at the apex (reference point of the height ha). It is the lowest among 31. The low convex portion 33 of the three-dimensional dome structure has the lowest fiber density among the low convex portions 33 at the apex (the reference point of the height hc). Thus, the fiber density at the apex of the high convex portion 32 (reference point of height hb) is the fiber density at the apex of the intermediate convex portion 31 (reference point of height ha) and the apex (height of the low convex portion 33). The fiber density at the vertex of the middle convex portion 31 (reference point of the height ha) is lower than the fiber density at the reference point of hc, and the fiber density at the vertex of the low convex portion 33 (reference point of the height hc). It is lower than the density.

The ratio (db / da) of the fiber density db at the vertex (reference point of height hb) of the high convex portion 32 to the fiber density da at the vertex (reference point of height ha) of the middle convex portion 31 was excreted. From the viewpoint of enhancing the drawing-in property of the body fluid, 1.2 times or more, preferably 1.5 times or more, and 3.0 times or less, preferably 2.5 times or less, more specifically 1.2 times. The ratio is preferably 3.0 times or more and more preferably 1.5 times or more and 2.5 times or less.
The ratio (db / dc) of the fiber density db at the apex of the high convex portion 32 (reference point of height hb) to the fiber density dc at the apex of the low convex portion 33 (reference point of height hc) was excreted. From the viewpoint of enhancing the drawing-in property of the body fluid, 1.2 times or more, preferably 1.5 times or more, and 3.0 times or less, preferably 2.5 times or less, more specifically 1.2 times. The ratio is preferably 3.0 times or more and more preferably 1.5 times or more and 2.5 times or less.
The ratio (da / dc) of the fiber density da at the vertex (reference point of height ha) of the middle convex portion 31 to the fiber density dc at the vertex (reference point of height hc) of the low convex portion 33 was excreted. From the viewpoint of enhancing the drawing-in property of the body fluid, 1.2 times or more, preferably 1.5 times or more, and 3.0 times or less, preferably 2.5 times or less, more specifically 1.2 times. The ratio is preferably 3.0 times or more and more preferably 1.5 times or more and 2.5 times or less.

The ratio of the fiber density of the top sheet 10A can be measured using either one of the two methods (1) and (2) described below.
(1) When the basis weight of the top sheet 10A is substantially uniform (uniform) (or when it can be determined to be substantially uniform), the height (thickness) of the cut surface of the top sheet 10A is measured.
(2) When the basis weight of the top sheet 10A is non-uniform (or can be determined to be non-uniform), the average distance between fibers on the cut surface of the top sheet 10A is measured.

Here, the determination as to whether the basis weight of the top sheet 10A is substantially uniform is performed as follows.
When 10 or more cut samples having a size of 10 cm in the vertical direction and 10 cm in the horizontal direction are taken out from the surface sheet 10A and each basis weight is measured, the triple value (3σ) of the standard deviation σ is within 10% of the average μ. If there is no fiber unevenness on the appearance, it is judged as substantially uniform. However, it is preferable to make a comprehensive judgment in consideration of various factors such as the composition being different in a minute region.

First, the method (1) will be described.
A sample for measuring the high protrusion 32 is prepared by cutting from the top sheet 10A in plan view along a straight line passing through the center of gravity (vertex) of the high protrusion 32 of the three-dimensional dome structure and the two joints 2 at both ends. Similarly, a sample for measuring the middle convex portion 31 is created by cutting along a straight line passing through the center of gravity (vertex) of the middle convex portion 31 of the three-dimensional dome structure and the two joint portions 2 at both ends. Similarly, a sample for measuring the low convex portion 33 is created by cutting along a straight line passing through the center of gravity (vertex) of the low convex portion 33 of the three-dimensional dome structure and the two joint portions 2 at both ends. At this time, care should be taken not to cause a decrease in the height of each measurement sample due to cutting.

The cross section of each measurement sample obtained was measured using an electron microscope JCM-5100 manufactured by JEOL Ltd. under the conditions of a sputtering time of 30 seconds (Pt) and an acceleration voltage of 10 KV. At least one of the joint portions 2 is photographed, or a situation where the joint portion 2 can be understood by combining a plurality of images, and the height (thickness) of each measurement sample is measured from the photographed images. Note that the image measurement may be performed using either a printed matter or a PC screen.
In the method (1), the height hb (thickness) of the central portion of the sample for measuring the high convex portion 32 is divided by the height ha (thickness) of the central portion of the sample for measuring the middle convex portion 31 to obtain the density. The ratio is (db / da). Further, the density ratio (db / dc) is obtained by dividing the height hb (thickness) of the central portion of the sample for measuring the high convex portion 32 by the height hc (thickness) of the central portion of the sample for measuring the low convex portion 33. And Further, the ratio of the density (da / dc) by dividing the height ha (thickness) of the central portion of the sample for measuring the middle convex portion 31 by the height hc (thickness) of the central portion of the sample for measuring the low convex portion 33. And

Next, the method (2) will be described.
The cross section is measured in the same manner as in the method (1). In addition to the measurement performed by the method (1), the cross section of each measurement sample is photographed at an enlargement magnification of 500 to 1000 times. In the region where the number of fibers is 3 to 7 in the width direction (plane direction) at the target measurement site (center portion of each measurement sample) of each of the magnified images, an image analyzer (NEWQBE ver. 4.20 made by NEXT) Is used to find the distance between the nearest centers of gravity of the fibers.
In the above measurement, measurement is performed almost entirely in the height (thickness) direction, and the closest distance between the centers of gravity is not caused to overlap. Moreover, about a cross section, it measures at least 3 places, Preferably 5 places, More preferably, 10 places, The average value is used.
In the method of (2), the distance ratio between the nearest centroids at the center of the sample for measuring the high convex portion 32 is divided by the distance between the nearest centroids at the center of the sample for measuring the middle convex portion 31 ( In addition, the distance ratio between the nearest centroids at the center of the sample for measuring the high convex portion 32 is divided by the distance between the nearest centroids at the center of the sample for measuring the low convex portion 33. In addition, the distance ratio between the nearest centroids of the center portion of the sample for determining the middle convex portion 31 is divided by the distance between the nearest centroids of the center portion of the sample for measuring the low convex portion 33. (Da / dc).

  As described above, the skin care agent 4 is disposed on the top sheet 10A. The amount of the skin care agent 4 is greater at the top of the middle convex portion 31 than at the top of the high convex portion 32. If the amount of the skin care agent 4 at the top of the middle convex portion 31 is larger than the amount of the skin care agent 4 at the top of the high convex portion 32, the application shape of the skin care agent 4 is not particularly limited, but the topsheet 10A of the first embodiment. In FIG. 1 and FIG. 2, the skin care agent-containing region ST in which the skin care agent 4 is disposed and the skin care agent-free region NST in which the skin care agent 4 is not disposed are divided. And in the surface sheet 10A, the middle convex part 31 is distribute | arranged to skin care agent containing area | region ST. Preferably, in the topsheet 10A, the skin care agent-containing region ST and the skin care agent-free region NST both extend continuously in the horizontal direction Y, and the skin care agent-containing region ST and the skin care agent-free region in the vertical direction X. NSTs are alternately arranged to form stripes. Then, as shown in FIG. 2, the skin care agent-containing region ST is formed in a strip shape on the first convex row 30La in which the middle convex portions 31 and the low convex portions 33 are alternately arranged in the lateral direction Y. And formed so as to include at least the top portion of the middle convex portion 31. Further, the skin care agent non-containing region NST is formed in a strip shape on the second convex row 30Lb in which a plurality of high convex portions 32 are arranged in the lateral direction Y. Here, the top of the convex portion 3 means a region surrounded by a virtual circle having a radius of 2 mm with the vertex of the convex portion 3 as the center when the convex portion 3 is viewed in plan.

In the topsheet 10 </ b> A, the amount of the skin care agent 4 at the top of the middle convex portion 31 is larger than the amount of the skin care agent 4 at the top of the high convex portion 32. The amount of the skin care agent 4 disposed on the top of the middle convex portion 31 and the top of the high convex portion 32 is compared with the amount per unit area including the vertex of the top portion. The amount of the skin care agent 4 disposed on the top of the middle convex portion 31 is preferably 1.0 g / m ² or more and 3.0 g / m ² or less, more preferably 1.5 g / m ² or more and 2.5 g / m ^2. It is as follows. The amount of the skin care agent 4 disposed on the top of the high convex portion 32 is preferably 0.5 g / m ² or more and 1.2 g / m ² or less, more preferably 0.7 g / m ² or more and 1.0 g / m ^2. It is as follows. The amount of the skin care agent in each part of the topsheet 10A can be measured by the following method.

<Measurement of amount of skin care agent>
A method for measuring the content of the skin care agent 4 at the top of the middle convex portion 31 and the top of the high convex portion 32 will be described.
Infrared spectroscopy (IR) can be used as a method for measuring the amount of the skin care agent 4. When comparing a place where the skin care agent 4 is large and a place where the skin care agent 4 is small, it is possible to judge whether the skin care agent 4 is large or small by comparing the height of the infrared absorption peak obtained by IR. That is, it can be seen that there are many skin care agents 4 having a higher infrared absorption peak (a higher absorption amount).
Further, by deriving each relative value from the height of the infrared absorption peak derived from each skin care agent, and using the relationship with the amount of the skin care agent 4 applied to the whole, the top of the middle convex portion 31 and the high convexity. The amount of the skin care agent 4 present at each of the tops of the parts 32 can be calculated.
The ATR method can be used for infrared spectroscopy. If the range to be measured is sufficiently wide, any one of absorption peaks obtained by direct measurement (macro: 2 to 3 mm) (for example, a diamide derivative described later) In the case of 3300 cm ⁻¹ ), which is the absorption peak of the amide group, can be compared. Moreover, when the site | part to measure is small, it is good to use a microscope (100 micrometers).
As an example, the measurement procedure is shown below.
Measuring device: Perkin Elmer Spectrum One (+ Multiscope)
Macro measurement: ATR probe is measured with a single reflection using diamond Microscopic measurement: ATR probe is measured with germanium Wave number resolution: 4 cm ⁻¹
Integration count: 4 times (macro measurement), 16 times (microscopic measurement)

  The skin care agent 4 of the top sheet 10A can control the arrangement and application amount of the skin care agent 4 by pattern coating using, for example, an ink jet printer. Specifically, in the topsheet 10A, as shown in FIG. 2, the skin care agent-containing region ST is formed in a band shape on the first convex row 30La, and the skin care agent-free region NST is formed as the second convex portion. It forms in strip | belt shape on row | line | column 30Lb, and distribute | arranges the quantity of the skin care agent 4 of the top part of the middle convex part 31 more than the quantity of the skin care agent 4 of the top part of the high convex part 32. FIG.

  As skin care agent 4, what has effects, such as protection and healing with respect to a wearer's skin, can be especially used without a restriction | limiting. For example, a preferable skin care agent includes a diamide derivative represented by the following formula (I) described in Japanese Patent Application Laid-Open No. 2004-255166 of the prior application of the present applicant.

  The diamide derivative represented by the above formula (I) is a diamide derivative of the invention described in International Publication No. WO00 / 61097, and has a medicinal effect of improving the water retention ability and barrier function of the stratum corneum. doing. When the diamide derivative held at the top of the middle convex portion 31 or the top of the high convex portion 32 shifts to the wearer's skin while wearing the absorbent article, it functions as an oily skin care agent and suppresses skin irritation. / Can be improved.

  When using the said diamide derivative, the diamide derivative to be used may be only 1 type, and can also use 2 or more types together.

Moreover, as another skin care agent which can be used by this invention, the oil-based skin care agent etc. which are used as an emollient agent in the field | area of cosmetics can be used, for example.
Specific examples of the other skin care agents include liquid paraffin, silicone oil, animal and vegetable oils (olive oil, jojoba oil, safflower oil, squalane and squalene, etc.), monoglyceride, diglyceride, triglyceride, aliphatic ether (myristyl-1,3- Dimethylbutyl ether, palmityl-1,3-dimethylbutyl ether, stearyl-1,3-dimethylbutyl ether, palmityl-1,3-methylpropyl ether, stearyl-1,3-methylpropyl ether, etc.), isostearyl-cholesterol ester, paraffin _waxes, C 12 _{-C 22} fatty _acids, C 12 _{-C 44} fatty _ethers, C 12 _{-C 22} fatty alcohols, vaseline, fatty acid sorbitan esters (monoesters, diesters, and triesters ), Polyoxyethylene fatty acid sorbitan ester (any of monoester, diester, and triester), metal exploration (magnesium stearate, etc.), sucrose fatty acid ester, cyclodextrin fatty acid ester, silicone, Examples thereof include a silicone resin, an emollient used in the invention described in Patent Document 1 or Patent Document 2, and a lotion composition containing an emollient and a fixing agent.
The various skin care agents may be used alone or in combination of two or more.

  From the viewpoint of stably fixing on the top sheet 10A, the skin care agent preferably contains a fixing agent. Examples of the fixing agent include an aliphatic monoalcohol having 14 to 22 carbon atoms (preferably stearyl alcohol), an aliphatic monocarboxylic acid having 12 to 22 carbon atoms, and an aliphatic monocarboxylic acid having 14 to 22 carbon atoms. Esters with alcohol are known. Among these substances, when an aliphatic monoalcohol having 14 to 22 carbon atoms is used as a fixing agent, the occurrence of stickiness caused by the amide derivative represented by the formula (I) can be effectively reduced. The immobilization effect of the amide derivative represented by I) is particularly high.

  Examples of the aliphatic monoalcohol having 14 to 22 carbon atoms used as the immobilizing agent include saturated aliphatic monoalcohols such as lauryl alcohol, myristyl alcohol, cetyl alcohol and stearyl alcohol, and oleyl alcohol and linoleyl alcohol. A saturated aliphatic monoalcohol can be used. These alcohols can be used alone or in combination of two or more. Among saturated aliphatic monoalcohols and unsaturated aliphatic monoalcohols, the use of saturated aliphatic monoalcohols can effectively reduce the occurrence of stickiness caused by the amide derivative represented by formula (I). preferable. When cetyl alcohol and stearyl alcohol are used as the saturated aliphatic monoalcohol, the occurrence of stickiness caused by the amide derivative represented by the formula (I) can be more effectively reduced. In particular, it is advantageous to use stearyl alcohol.

  The ratio of the use of the amide derivative represented by the formula (I) and the aliphatic monoalcohol having 14 to 22 carbon atoms is such that the amount of the aliphatic monoalcohol used is relatively large relative to the amide derivative. It is preferable to do. In particular, the aliphatic monoalcohol is 60% by mass or more, preferably 70% by mass or more, and the upper limit is 90% by mass or less, preferably 85% by mass, based on the total mass of the amide derivative and the aliphatic monoalcohol. By setting it as the following, suppression of a sticky feeling and the expression of a skin care effect can be balanced successfully.

  The contact angle between the top of the middle convex portion 31 where the skin care agent 4 is disposed and the ion-exchanged water is preferably 60 ° or more, and more preferably 65 ° or more, from the viewpoint of excretory fluid permeability. And, it is preferably 90 degrees or less, more preferably 87 degrees or less, specifically preferably 60 degrees or more and 90 degrees or less, and more preferably 65 degrees or more and 87 degrees or less. preferable. The contact angle between the top of the middle convex portion 31 and the ion exchange water can be measured by the following method.

<Measurement of the contact angle between the top of the middle convex portion 31 and ion-exchanged water>
For the measurement of the contact angle, a contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used. Specifically, after the ion-exchanged water is dropped (about 20 picoliters) on the top sheet 10A to which the skin care agent is applied, the contact angle is measured immediately using the contact angle meter. In the measurement, the middle convex portion 31 of the topsheet 10A is performed at five or more locations, and the average value is set as the contact angle of that portion.

The effect of an absorbent article provided with 10 A of top sheets of 1st Embodiment mentioned above is demonstrated.
As shown in FIG. 1, the absorbent article including the top sheet 10 </ b> A is composed of a nonwoven fabric having a concavo-convex structure in which the top sheet 10 </ b> A is dispersed with two types of convex portions 3 having different heights. The middle convex portion 31 having the highest height after the highest high convex portion 32 is formed so that the compression work amount is larger than the compression work amount of the high convex portion 32. Therefore, the shape retainability of the middle convex portion 31 is higher than the shape retainability of the high convex portion 32, and the skin care agent 4 can be stably retained in the topsheet 10A. And the amount of the skin care agent 4 is larger in the top part of the middle convex part 31 having relatively high form retainability than in the top part of the high convex part 32 having relatively low form retainability. Therefore, for example, in the folded state before wearing the absorbent article, the skin care agent 4 disposed on the middle convex portion 31 having a height lower than that of the high convex portion 32 is difficult to move to other members, and the topsheet 10A The skin care agent 4 can be stably held therein. Moreover, even if the skin care agent 4 distribute | arranged to the top part of the high convex part 32 transfers to a wearer's skin during wear of an absorbent article, the top part of the intermediate | middle convex part 31 where more skin care agents 4 are distribute | arranged. The skin care agent 4 can be effectively transferred to the skin when worn, and the durability of the skin care effect is improved.

  Moreover, in an absorbent article provided with the top sheet 10 </ b> A, the inter-fiber distance of the constituent fibers of the middle convex portion 31 having the next highest height after the highest high convex portion 32 constitutes the high convex portion 32. It is smaller than the distance between fibers. Therefore, it is easy to hold the skin care agent 4 between the fibers constituting the middle convex portion 31, the skin care agent 4 can be stably held in the top sheet 10A, and the durability of the skin care effect is improved.

  Moreover, in the absorbent article provided with the top sheet 10A, as shown in FIGS. 1 and 2, the middle convex portion 31 is arranged in the skin care agent-containing region ST of the top sheet 10A. Therefore, the amount of the skin care agent 4 is more likely to be higher at the top of the middle convex portion 31 than at the top of the high convex portion 32, and the skin care agent 4 can be more stably held in the top sheet 10A, and the skin care effect is improved. Sustainability is further improved.

  Moreover, in an absorbent article provided with 10 A of surface sheets, as shown in FIG.1 and FIG.2, the convex part 3 of 10A of surface sheets has a solid structure where the inside was satisfy | filled with the constituent fiber. Therefore, the shape retaining property of the convex portion 3 is high, and the skin care agent 4 can be more stably retained in the top sheet 10A.

  Next, the surface sheet 10B which is 2nd Embodiment of the surface sheet with which the absorbent article of this invention is provided is demonstrated. Unlike the surface sheet 10A of 1st Embodiment comprised by one nonwoven fabric, the surface sheet 10B which is 2nd Embodiment is comprised by two nonwoven fabrics. About the surface sheet 10B of 2nd Embodiment, a different point from 10 A of surface sheets of 1st Embodiment is mainly demonstrated, the same code | symbol is attached | subjected about the same point, and description is abbreviate | omitted. For points that are not particularly mentioned, the description relating to the topsheet 10A is applied as appropriate. Moreover, about the effect of the surface sheet 10B of 2nd Embodiment, a different point from the effect of the surface sheet 10A is demonstrated, The point which is not demonstrated in particular is the same as the effect of the surface sheet 10A, Description of the effect of the surface sheet 10A Applies as appropriate.

  As shown in FIGS. 8 and 9, the top sheet 10 </ b> B of the second embodiment is a second joint portion 2 </ b> B formed by partially heat-sealing the first nonwoven fabric 11 and the second nonwoven fabric 12 that are laminated to each other. It is formed with a three-dimensional sheet having a concavo-convex structure. And the 2nd junction part 2B is distribute | arranged to the bottom part of the solid sheet of a concavo-convex structure. Preferably, in the topsheet 10B of the second embodiment, the first nonwoven fabric 11 and the second nonwoven fabric 12 laminated to each other are partially heat-sealed to form the second joint 2B, and the first nonwoven fabric 11 is In the non-fused part surrounded by the second bonding part 2B, it protrudes in a direction away from the second nonwoven fabric 12 to the skin facing surface side, and a plurality of hollow convex parts 3 are formed. The surface sheet 10B has a substantially flat surface on the second nonwoven fabric 12 side, and a concavo-convex structure including a plurality of convex portions 3 having large undulations and a bottom portion that is a plurality of second joint portions 2B is formed on the first nonwoven fabric 11 side. ing.

  As shown in FIGS. 8 and 9, the topsheet 10B is a non-woven fabric having a concavo-convex structure in which at least two kinds of convex portions 3 projecting toward the skin facing surface are dispersed in the in-plane direction of the topsheet 10B. In the second embodiment, two types of convex portions 3 having different heights, specifically, the second high convex portion 32B and the second low convex portion 33B are provided with an uneven structure in which they are dispersed in the in-plane direction. ing. In the topsheet 10B of the second embodiment, the first convex portion having the highest height is the second high convex portion 32B, and the second convex portion having the second highest height after the first convex portion is the second low convex portion. 33B. The two types of convex portions 3 including the second high convex portion 32B and the second low convex portion 33B may be dispersed in the in-plane direction of the topsheet, but in the topsheet 10B, as shown in FIG. Two kinds of convex portions 3 are dispersed in the in-plane direction of the topsheet 10B in a regular pattern.

  In the uneven structure of the top sheet 10B of the second embodiment, for example, when the top sheet 10B is manufactured, a portion corresponding to a portion surrounded by the plurality of second joints 2B is a second nonwoven fabric 12 in the first nonwoven fabric 11. Pressing from the back side, which is the side facing the surface (see, for example, the method described in Japanese Patent Application Laid-Open No. 2015-142721 of the prior application of the present applicant), and the surface facing the second nonwoven fabric 12 in the first nonwoven fabric 11 Is formed from the surface side which is the opposite surface side (for example, refer to the method described in Japanese Patent Application Laid-Open No. 2013-177715 of the applicant's prior application), etc. can do.

  Although it does not specifically limit as a shape which planarly viewed each 2nd junction part 2B, in the surface sheet 10B of 2nd Embodiment, as shown in FIG. 8, it is an ellipse shape long in one direction. .

  The convex part 3 that is a non-fused part is surrounded by a plurality of second joining parts 2B. In the top sheet 10B of the second embodiment, as shown in FIG. The high convex portion 32B is surrounded by eight second joint portions 2B, and the bottom surface has an octagonal shape. Further, the second low convex portion 33B is surrounded by the four second joint portions 2B in a plan view as shown in FIG. 8, and the bottom surface has a square shape.

  The cross-sectional shapes of the second high convex portion 32B and the second low convex portion 33B may be a dome shape, a flat rectangular parallelepiped, a truncated quadrangular pyramid, or the like with the ridgeline smoothly rounded as a whole. Preferably, the topsheet 10B of the second embodiment has a rounded dome shape as shown in FIG.

  In the topsheet 10B of the second embodiment, as shown in FIG. 8, two second joints that share one second joint 2B in a direction inclined rightward with respect to the vertical direction X and the horizontal direction Y are provided. Two high-convex portions 32B, 32B are arranged in series in a straight line, and a plurality of first joint rows LR1 and one second joint in a direction inclined leftward with respect to the vertical direction X and the horizontal direction Y The second high convex portion 32B is arranged in a pattern that forms a plurality of second joint rows LR2 in which the two second high convex portions 32B, 32B sharing the portion 2B are linearly connected in series. Yes. In the top sheet 10B of the second embodiment, the second high convex portions 32B and the second low convex portions 33B are alternately arranged in the vertical direction X, and the second high convex portions 32B and the second high convex portions 32B are arranged in the horizontal direction Y. 2 low convex portions 33B are alternately arranged. Focusing on one row extending in the vertical direction X, the second high convex portion 32B constituting the row and the second high convex portion 32B constituting another row adjacent to the row in the horizontal direction Y are half The pitch is shifted. When attention is paid to one row extending in the horizontal direction Y, a second high convex portion 32B constituting the row and a second high convex portion 32B constituting another row adjacent to the row in the vertical direction X are provided. , Are arranged with a half-pitch shift. And the 2nd high convex part 32B and the 2nd low convex part 33B are arranged so that one 2nd low convex part 33B may be surrounded by four 2nd high convex parts 32B.

As a nonwoven fabric which comprises the 1st nonwoven fabric 11 and the 2nd nonwoven fabric 12, an air through nonwoven fabric, a spun bond nonwoven fabric, a spunlace nonwoven fabric, a melt blown nonwoven fabric, a resin bond nonwoven fabric, a needle punch nonwoven fabric etc. are mentioned, for example. A laminate obtained by combining two or more of these nonwoven fabrics, or a laminate obtained by combining these nonwoven fabrics and a film can also be used. Among these, it is preferable to use an air-through nonwoven fabric or a spunbonded nonwoven fabric. The basis weight of the nonwoven fabric is preferably 10 g / m ² or more, more preferably 15 g / m ² or more, and preferably 40 g / m ² or less, more preferably 35 g / m ² or less. The basis weight of the nonwoven fabric is preferably 10 g / m ² or more and 40 g / m ² or less, and more preferably 15 g / m ² or more and 35 g / m ² or less.

  As the fibers constituting the nonwoven fabric, fibers made of various thermoplastic resins can be used. Examples of the thermoplastic resin include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polyamides such as nylon 6 and nylon 66, polyacrylic acid, polymethacrylic acid alkyl ester, polyvinyl chloride, and polyvinylidene chloride. These resins can be used alone or as a blend of two or more. Further, it can be used in the form of a composite fiber such as a core-sheath type or a side-by-side type.

  In the topsheet 10B of the second embodiment, the second low convex portion 33B having the second highest height after the second high convex portion 32B having the highest height among the convex portions 3 has a compression work amount of the second. It is larger than the compression work of the high convex portion 32B.

  Skin care agent 4 is arranged on top sheet 10B of a 2nd embodiment. The amount of the skin care agent 4 is larger at the top of the second low convex portion 33B having the second highest height than the second high convex portion 32B having the highest height than the top of the second high convex portion 32B. Yes. If the amount of the skin care agent 4 at the top of the second low convex portion 33B is larger than the amount of the skin care agent 4 at the top of the second high convex portion 32B, the application shape of the skin care agent 4 is not particularly limited, but the second embodiment. 8 and 9, the topsheet 10B is divided into a skin care agent-containing region ST in which the skin care agent 4 is disposed and a skin care agent-free region NST in which the skin care agent 4 is not disposed. . And in the surface sheet 10B, the middle convex part 31 is distribute | arranged to the skin care agent containing area | region ST. Preferably, in the topsheet 10B, the skin care agent-containing region ST and the skin care agent-free region NST both extend continuously in the longitudinal direction X, and the skin care agent-containing region ST and the skin care agent-free region in the lateral direction Y. NSTs are alternately arranged to form stripes. Then, as shown in FIG. 8, the skin care agent-containing region ST is formed in a strip shape on a row in which the second high convex portions 32B and the second low convex portions 33B are alternately arranged in the vertical direction X. In each skin care agent-containing region ST, many skin care agents 4 are arranged particularly on the tops of the second low convex portions 33B.

  The skin care agent 4 of the topsheet 10B of the second embodiment can control the arrangement and application amount of the skin care agent 4 by pattern coating using, for example, an ink jet printer.

  In an absorbent article provided with the topsheet 10B of the second embodiment, as shown in FIGS. 8 and 9, the convex portion 3 of the topsheet 10B has a hollow structure. Therefore, the liquid return is prevented and the dry feeling is excellent. Furthermore, even if it does not contain a fixing agent, since it has a hollow structure, “back-through” in which the skin care agent contained in the convex portion 3 moves to the member on the back surface side is unlikely to occur.

  As mentioned above, although this invention was demonstrated based on the preferable 1st Embodiment and 2nd Embodiment, this invention is not restrict | limited to the said 1st Embodiment and 2nd Embodiment.

  For example, in the topsheet 10A of the first embodiment and the topsheet 10B of the second embodiment provided in the absorbent article described above, the skin care agent-containing region ST is formed in a stripe shape as shown in FIGS. However, the amount of the skin care agent 4 at the top of the second convex portion having the second highest height after the first convex portion having the highest height is larger than the amount of the skin care agent 4 at the top of the first convex portion. If it is, it does not have to be striped.

10A, 10B Topsheet 1u Non-heat-shrinkable fiber layer 1d Heat-shrinkable fiber layer 2 Joint part 20a, 20b, 20c Rod-like body 21 Center point 2B Second joint part 3 Convex part 31 Medium convex part 32 High convex part 32B Second high convex part Part 33 Low convex part 33B Second low convex part 34 Columnar convex part 4 Skin care agent 11 First nonwoven fabric 12 Second nonwoven fabric ST Skin care agent-containing region NST Skin care agent-free region

Claims (8)

An absorbent article comprising a liquid-permeable surface sheet, having a longitudinal direction along the wearer's front-rear direction when worn, and a lateral direction perpendicular to the longitudinal direction,
The topsheet is a non-woven fabric having a concavo-convex structure in which at least two kinds of convex portions having different heights protruding toward the skin facing surface are dispersed in the in-plane direction of the topsheet,
The surface sheet is provided with a skin care agent,
Among the convex portions, the second convex portion having the second highest height after the first convex portion having the highest height has a compression work larger than that of the first convex portion,
The amount of the skin care agent is an absorbent article in which the top portion of the second convex portion is larger than the top portion of the first convex portion.   The absorbent article according to claim 1, wherein an interfiber distance between fibers constituting the second convex portion is smaller than an interfiber distance between fibers constituting the first convex portion.   The absorbent article according to claim 1 or 2, wherein a ratio of a bottom area of the first protrusion to a bottom area of the second protrusion is 2 or more and 10 or less. The surface sheet is divided into a skin care agent-containing region in which the skin care agent is disposed and a skin care agent-free region in which the skin care agent is not disposed,
The absorptive article according to any one of claims 1 to 3 in which said 2nd convex part is arranged in said skin care agent content field.   The absorbent article according to any one of claims 1 to 4, wherein the convex portion has a solid structure filled with constituent fibers.   The absorbent article according to any one of claims 1 to 5, wherein the skin care agent contains a fixing agent.   The absorptive article given in any 1 paragraph of Claims 1-6 whose contact angle of the top part of said 2nd convex part and ion-exchange water is 60 degrees or more and 90 degrees or less.   The absorptive article given in any 1 paragraph of Claims 1-7 whose ratio of the basic weight of said 2nd convex part to the basic weight of said 1st convex part is 1.2 or more and 4.0 or less.

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