JP2017029496A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article capable of suppressing fluid return of a body fluid which is guided to peripheral edges of slits, to a surface sheet, even when body pressure is applied during wearing of the absorbent article.SOLUTION: An absorbent article 1 comprises a surface sheet 2, a rear surface sheet 3, and an absorber 4 interposed between both sheets 2, 3. The surface sheet 2 is an irregular structure sheet comprising: skin side protrusion parts 21 protruding to a skin facing surface side and having an inner space S1; and non-skin side protrusion parts 22 protruding to a non-skin facing surface side and having an inner space S2. The skin side protrusion part 21 comprises a top part 21T and an annular wall part 21W thereof, in which a fiber basis weight of the wall part 21W is higher than that of the top part 21T. The absorber 4 is formed of a laminate of absorbent sheets, and has slits 43. The slits 43 penetrate one layer of the laminate. On a part other than linear compression grooves 8 on an excretion part facing part B, a hollow structure is formed between the respective skin side protrusion parts 21 of the surface sheet 2 and the absorber 4.SELECTED DRAWING: Figure 2

Description

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

  The present applicant previously arranged an absorbent sheet directly on the absorbent body, provided a multilayer slit in the lower layer of the surface sheet, and provided a plurality of solid convex portions in the upper layer of the surface sheet. (See Patent Document 1). In addition, the applicant previously provided a plurality of vertical slits in the absorber, and the surface sheet disposed above the absorber was partitioned by forming a diagonal lattice-like depression by crimping the constituent fibers. The absorbent article in which the convex part was formed was proposed (refer patent document 2).

  In addition to the absorbent article, Patent Document 3 discloses that a surface sheet is provided immediately above the absorbent body, a plurality of convex portions are provided on the surface sheet, and a hollow is provided between the convex portions of the surface sheet and the absorbent body. An absorbent article having a structure is described.

JP 2005-319043 A Japanese Patent Laying-Open No. 2015-024002 JP 2009-268559 A

  Since the absorbent article described in Patent Document 1 has a multilayer slit in the lower layer of the top sheet, it can quickly absorb the excreted body fluid and quickly transfer it to the absorber located below the body fluid. it can. Moreover, since the absorbent article described in Patent Document 2 is provided with a plurality of vertical slits in the absorbent body, it is difficult for wrinkles to enter the surface sheet, and the excreted body fluid can be quickly absorbed into the absorbent body. However, since the slit is usually formed by cutting with a blade, when pressed with the blade during processing, the fiber basis weight of the slit periphery increases, and body fluid gathers at the slit periphery, resulting from the cutting. The liquid may easily remain in a slight gap. Thus, if body fluid collects at the slit periphery, there is a concern that body fluid may return to the topsheet due to body pressure when the absorbent article is worn. The present inventor has come to the desire to further eliminate such body fluid return.

  Since the absorptive article given in patent documents 3 has a hollow structure between the convex part of a surface sheet, and an absorber, liquid return of body fluid absorbed by an absorber can be controlled. However, Patent Document 3 does not describe anything about a configuration that makes it difficult to return the body fluid collected at the periphery of the slit to the top sheet even when body pressure is applied when the absorbent article is worn.

  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 comprises a liquid-permeable surface sheet that forms a skin-facing surface, a back sheet that forms a non-skin-facing surface, and an absorbent body interposed between the two sheets, and is placed on the excretion part of the wearer when worn. Absorption having an excretory part opposing part disposed oppositely, a front part arranged on the abdomen side of the wearer from the excretory part opposing part, and a rear part arranged on the back side of the wearer from the excretory part opposing part An absorbent article having a longitudinal direction corresponding to the longitudinal direction of the wearer and a lateral direction orthogonal to the longitudinal direction, wherein the topsheet protrudes toward the skin facing surface and has an internal space. It is a sheet having a concavo-convex structure having a skin-side protruding portion and a plurality of non-skin-side protruding portions protruding to the non-skin facing surface side and having an internal space, and the skin-side protruding portion has an apex portion and an opening portion of the internal space A wall portion of an annular structure between and the wall portion of the skin-side protruding portion. The basis weight is higher than the fiber basis weight of the top portion of the skin-side protruding portion, the absorbent body is formed from a laminate of absorbent sheets, and a plurality of slits are provided in the excretory portion-facing portion. The slit penetrates at least one layer on the top sheet side of the laminate, and a hollow structure is formed between the skin-side protruding portion and the absorber in the excretory portion-facing portion. The present invention provides an absorbent article including a hollow portion and a non-crimped portion where the non-skin-side protruding portion and the absorbent body are not crimped.

  According to the absorbent article of the present invention, it is difficult to return the liquid to the topsheet even if body pressure is applied when the absorbent article is worn.

FIG. 1 is a plan view showing the skin facing surface side (surface sheet side) of a sanitary napkin which is a preferred embodiment of the absorbent article of the present invention. FIG. 2 is an end view schematically showing a cross section taken along line II-II in FIG. 3 is a partially enlarged end view of the end view shown in FIG. FIG. 4 is an enlarged perspective view of a main part of the topsheet provided in the sanitary napkin shown in FIG. FIG. 5 is an enlarged schematic cross-sectional view of a main part of the topsheet shown in FIG. FIG. 6 is a plan view of an absorbent body included in the sanitary napkin shown in FIG. 7 (a) to 7 (b) are partially enlarged plan views showing a preferred arrangement of the vertical slits in the excretory slit region of the absorbent body shown in FIG. FIG. 8 is an enlarged perspective view of a main part of a top sheet of another embodiment provided in the absorbent article of the present invention. FIG. 9 is an enlarged perspective view of a main part of a surface sheet provided in the sanitary napkin of Comparative Example 1.

  Hereinafter, an absorbent article of the present invention will be described with reference to the drawings based on a sanitary napkin 1 (hereinafter also referred to as “napkin 1”) which is a preferred embodiment thereof. FIG. 1 shows a plan view of the napkin 1 of the present embodiment as viewed from the surface sheet side, and FIG. 2 shows an end view of the napkin 1 of the present embodiment. Moreover, the partially expanded end view of the napkin 1 of this embodiment is shown by FIG. As shown in FIGS. 1 to 3, the napkin 1 is interposed between a liquid-permeable surface sheet 2 that forms a skin facing surface, a back sheet 3 that forms a non-skin facing surface, and both the sheets 2 and 3. The absorbent body 10 having the absorbent body 4 is provided.

  As shown in FIG. 1, the absorbent main body 10 of the napkin 1 is a wearer than the excretion part facing part B, which is disposed opposite to the excretion part (vagina mouth or the like) of the wearer when worn, and the wearer facing part B. The front part A is arranged closer to the stomach side (front side) and the rear part C is arranged closer to the wearer's back side (rear side) than the excretory part facing part B. The napkin 1 and the absorbent main body 10 have a longitudinal direction X corresponding to the wearer's front-rear direction and a transverse direction Y orthogonal to the longitudinal direction X. That is, the absorbent main body 10 is divided in the order of the front part A, the excretory part opposing part B, and the rear part C in the vertical direction X.

  In the present specification, the skin facing surface is a surface facing the wearer's skin when the napkin 1 is worn in the napkin 1 or its constituent member (for example, the absorbent main body 10), and the non-skin facing surface is The napkin 1 or a component of the napkin 1 is a surface directed to the side opposite to the skin side (clothing side) when the napkin 1 is worn. Further, the longitudinal direction X coincides with the longitudinal direction of the napkin 1 and the absorbent main body 10, and the lateral direction Y coincides with the width direction (direction orthogonal to the longitudinal direction) of the napkin 1 and the absorbent main body 10.

  In the present embodiment, as shown in FIGS. 1 and 2, the napkin 1 is further laterally extended from both side portions along the longitudinal direction X of the excretory part-facing portion B of the absorbent main body 10 in addition to the absorbent main body 10. It has a pair of wing parts 10W and 10W extending outward of Y.

  In the absorbent article of the present invention, when the excretory part facing part B has the wing part 10W like the napkin 1 of the present embodiment, the longitudinal direction of the absorbent article (the longitudinal direction of the absorbent article, FIG. (X direction in the middle) means a region having a wing portion 10W (a region sandwiched between a root along the vertical direction X of one wing portion 10W and a root along the vertical direction X of the other wing portion 10W). The excretion part opposing part in the absorbent article which does not have a wing part is the transverse direction (width direction of an absorbent article, in the figure) generated when the absorbent article is folded into a tri-fold individual form. As for two folding lines (not shown) crossing in the Y direction of the absorbent article, it means a region surrounded by the first folding curve and the second folding curve counted from the front end in the longitudinal direction X of the absorbent article. .

  In the napkin 1, as shown in FIG. 2, the surface sheet 2 covers the entire skin facing surface of the absorbent body 4, and extends outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent body 4. ing. On the other hand, the back sheet 3 covers the entire area of the non-skin facing surface of the absorbent body 4 and further extends outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent body 4 to be described later. In addition, a side flap portion 10S is formed. The back sheet 3 and the side sheet 5 are joined to each other by known joining means such as an adhesive, a heat seal, and an ultrasonic seal at the extended portions from both side edges along the longitudinal direction X of the absorber 4.

  In the napkin 1, the side sheets 5 are disposed on both side portions along the longitudinal direction X of the skin facing surface of the absorbent main body 10 (skin facing surface of the top sheet 2) as shown in FIGS. 1 and 2. Suitably, the side seat | sheet 5 is distribute | arranged over the full length of the vertical direction X of the absorptive main body 10 so that it may overlap with the left-right both sides along the vertical direction X of the absorber 4 in planar view.

  In the napkin 1, the pair of side sheets 5 and 5, as shown in FIG. 1, each have a linear first joining line 61 positioned in the excretory part facing part B and the longitudinal direction X of the first joining line 61. Are joined to the topsheet 2 by linear second joining lines 62 located in the front and rear (front part A and rear part C). The first joint line 61 is a curved line convex outward in the lateral direction Y in plan view, and the second joint line 62 is a line (zigzag) extending so as to alternately intersect the vertical direction in plan view. Linear). Thus, when the side sheet 5 is joined to the surface sheet 2 by the first joining line 61 and the second joining line 62 and fixed to the skin facing surface of the absorbent main body 10, as shown in FIG. A space P defined by the side sheet 5 and the top sheet 2 is formed inward in the lateral direction Y from the first bonding line 61 and the second bonding line 62. Since the space P is opened toward the center in the lateral direction Y of the absorbent main body 10, body fluid such as menstrual blood flowing outward from the center in the lateral Y is accommodated in the space P. As a result, leakage of body fluid can be effectively prevented.

  In the napkin 1, as shown in FIG. 1, the side flap part 10S protrudes greatly outward in the lateral direction Y at the excretory part facing part B, and thereby the left and right along the longitudinal direction X of the absorbent main body 10 A pair of wing portions 10W and 10W are extended on both sides. Further, as shown in FIG. 1, the top sheet 2 and the back sheet 3 extend outward in the longitudinal direction X from the front end and the rear end in the longitudinal direction X of the absorbent body 4. The end seal portion is formed by bonding to each other by a known bonding means such as an agent, heat sealing, ultrasonic sealing or the like.

  The wing portion 10W is used by being folded back to the non-skin facing surface side of the crotch portion of clothes such as shorts. In the napkin 1, the wing portion 10 </ b> W has a substantially trapezoidal shape in which a lower base (a side longer than the upper base) is located on a side portion along the longitudinal direction X of the absorbent main body 10 in a plan view, as shown in FIG. 1. It has a shape. As shown in FIG. 2, a wing adhesive portion 71 for fixing the wing portion 10W (napkin 1) to clothes (not shown) such as shorts is formed on the non-skin facing surface of the wing portion 10W. The wing portion adhesive portion 71 allows the wing portion 10W folded back to the non-skin facing surface (outer surface) side of the crotch portion of the clothing to be adhesively fixed to the crotch portion during use. Moreover, as shown in FIG. 2, the main body adhesion part 72 (displacement prevention part) for fixing the absorptive main body 10 to clothes, such as shorts, is also formed in the non-skin opposing surface of the absorptive main body 10. .

  In the napkin 1, as shown in FIG.1 and FIG.2, the surface sheet 2 and the absorber 4 are integrated to the skin opposing surface (skin opposing surface of the surface sheet 2) of the absorptive main body 10 toward the back sheet 3 side. A linear squeezing groove 8 is formed by being recessed. “Linear” in the linear compressed groove 8 means that the shape of the groove (concave portion) is not limited to a straight line in a plan view but includes a curved line. Each line may be a continuous line or a discontinuous line such as a broken line. For example, the linear squeezing groove 8 may be composed of a row formed by a number of discontinuous point embosses. The linear pressing groove 8 includes a first horizontal pressing groove 81 extending in the horizontal direction Y and a vertical pressing groove 82 extending in the vertical direction X on both sides of the excretory part-facing portion B in the front part A and the rear part C, respectively. Have. In the napkin 1, the 1st horizontal pressing groove 81 of the front part A and the rear part C is a curvilinear shape convex toward the vertical direction X outward, and each vertical pressing groove 82 faces the horizontal direction Y inward. Convex curve. In the napkin 1, the first lateral pressing groove 81 at the front portion A, the one vertical pressing groove 82, the first horizontal pressing groove 81 at the rear portion C, and the other vertical pressing groove 82 are connected to form a ring-shaped circumferential groove. Forming. Moreover, in the napkin 1, the linear pressing groove 8 has the 2nd horizontal pressing groove 83 extended in the horizontal direction Y in the longitudinal direction X inside rather than the 1st horizontal pressing groove 81 of the front part A and the back part C, respectively. 83. In the napkin 1, the 2nd horizontal pressing groove 83,83 of the front part A and the rear part C is the convex curvilinear shape toward the vertical direction X outward. In addition, as shown in FIG. 1, although the 2nd horizontal pressing grooves 83 and 83 of the napkin 1 are not connected with a pair of vertical pressing grooves 82 and 82, they may be connected. The linear squeezing groove 8 formed in this way can suppress diffusion of body fluid in the planar direction of the absorbent body 4 and effectively prevent liquid leakage from the periphery of the napkin 1.

  The surface sheet 2 of the napkin 1 will be described in detail. As shown in FIGS. 4 and 5, the surface sheet 2 projects to the skin facing surface side and has a plurality of skin side protruding portions 21 having an internal space S1, and a non-skin facing surface. It is a sheet | seat of the uneven structure which has the some non-skin side protrusion part 22 which protrudes in the side and has internal space S2. Preferably, when the surface sheet 2 is viewed in plan, the skin-side protrusions 21 and the non-skin-side protrusions 22 are alternately and continuously arranged along two different directions intersecting each other. Here, as for two different directions, it is preferable that an arbitrary first direction in the plane and a second direction intersecting with the first direction intersect at an angle of 30 degrees or more and 90 degrees or less, for example, 90 degrees for the napkin 1 Cross at. That is, for example, in the napkin 1, one of the two directions is the horizontal direction Y, and the other of the two directions is the vertical direction X. Therefore, when the surface sheet 2 is viewed in plan, the skin-side protrusions 21 and the non-skin-side protrusions 22 are alternately and continuously arranged along the vertical direction X and the horizontal direction Y. In the form shown in FIG. 5, the convex portion viewed from the skin facing surface side is the skin side protruding portion 21, and the concave portion is the non-skin side protruding portion 22. On the contrary, the convex portion viewed from the non-skin facing surface side is the non-skin-side protruding portion 22, and the concave portion is the skin-side protruding portion 21. Therefore, a part of the skin-side protrusion 21 and the non-skin-side protrusion 22 is shared. The shared portion means a ring-shaped wall portion 21W to be described later and a ring-shaped wall portion 22W to be described later.

  In the napkin 1, regarding the surface sheet 2, as shown in FIGS. 4 and 5, the skin-side protruding portion 21 has a wall portion 21W having an annular structure between the top portion 21T and the opening portion 21H of the internal space S1. doing. Further, the non-skin-side protruding portion 22 has a wall portion 22W having an annular structure between the top portion 22T and the opening portion 22H of the internal space S2. In the napkin 1, the skin-side protruding portion 21 and the non-skin-side protruding portion 22 have a truncated cone shape or a hemispherical shape in which the top portion 21T and the top portion 22T are rounded. The top portions 22 </ b> T of the plurality of non-skin-side protruding portions 22 have a lower basis weight of fibers than the surrounding portions, and may have through holes 23. In the embodiment shown in FIGS. 4 and 5, the non-skin-side protruding portion 22 has a through hole 23 that penetrates the top portion 22 </ b> T. When the non-skin-side protrusion 22 has the through-hole 23, some of the tops 22 </ b> T of the plurality of non-skin-side protrusions 22 may have the through-hole 23, and the tops of the non-skin-side protrusions 22. All of 22T may have a through hole 23. Moreover, the surface sheet 2 has the non-skin side protrusion part 22 provided with both the top part 22T which has the through-hole 23 which penetrates, and the top part 22T which does not have the through-hole 23 and the basic weight of the fiber is low. You may have. In addition, the non-skin-side protruding portion 22 may not have the through-hole 23 penetrating therethrough.

  If the skin side protrusion part 21 and the non-skin side protrusion part 22 which the surface sheet of the napkin 1 has are seen in detail, the protrusion shape of the skin side protrusion part 21 is hemispherical, on the other hand, the protrusion of the non-skin side protrusion part 22 The shape is a circular cone or truncated cone shape with a round top. In addition, the protrusion shape of the skin side protrusion part 21 and the non-skin side protrusion part 22 is not limited to the said shape, What kind of protrusion shape may be sufficient. For example, it may have a cone shape such as a cone, a truncated cone, a pyramid, a truncated pyramid, or an oblique cone. In the napkin 1, the skin-side protruding portion 21 and the non-skin-side protruding portion 22 hold a truncated cone-shaped or hemispherical internal space S1 and internal space S2 having rounded tops similar to the outer diameter thereof.

  When the topsheet 2 is viewed in plan from the skin facing surface side, the wall portion 21W of the skin side protruding portion 21 has an annular structure with the top portion 21T of the skin side protruding portion 21 as the center. Further, when the topsheet 2 is viewed in plan from the non-skin facing surface side, the wall portion 22W of the non-skin-side protruding portion 22 has an annular structure with the top portion 22T of the non-skin-side protruding portion 22 as the center. And the wall part 21W of the skin side protrusion part 21 shares the same site | part as the wall part 22W of the non-skin side protrusion part 22, as shown in FIG. Here, the “annular” is not particularly limited as long as it has an endless series of shapes in the plan view of the topsheet 2, and any shape such as a circle, an ellipse, a rectangle, or a polygon in the plan view of the topsheet 2 is used. Such a shape may be used. From the viewpoint of suitably maintaining the continuous state of the topsheet 2, a circular or elliptical annular structure is preferable. Furthermore, speaking of “annular” as a three-dimensional shape, a cylindrical shape, an oblique cylindrical shape, an elliptical columnar shape, a truncated cone shape, a truncated oblique cone shape, a truncated elliptical cone shape, a truncated rectangular pyramid shape, and a truncated oblique pyramid shape From the viewpoint of realizing a continuous sheet state, a cylindrical shape, an elliptic cylinder shape, a truncated cone shape, and a truncated elliptical cone shape are preferable.

  The surface sheet 2 having the skin-side protruding portion 21 and the non-skin-side protruding portion 22 provided as described above does not have a bent portion, and is configured by a continuous curved surface as a whole. Thus, it is preferable that the surface sheet 2 has a continuous structure in the planar direction. Here, “continuous” means that there is no small hole other than the through-hole 23 formed in the intermittent portion or the top portion 22 </ b> T of the non-skin-side protruding portion 22. However, fine holes such as gaps between fibers are not included in the small holes. The small hole including the through hole 23 can be defined as a hole having a diameter equivalent to a circle of 1.0 mm or more, for example.

    In the napkin 1, the topsheet 2 is different in the fiber basis weight of the constituent fibers in the thickness direction. Here, the fiber basis weight is the amount of fibers per unit area of the top sheet 2, that is, the number of fibers. A high fiber basis weight means that the amount of fibers present per unit area of the topsheet 2 is large and the interfiber distance is small. Low fiber basis weight means that the amount of fibers present per unit area of the topsheet 2 is small and the interfiber distance is large. That is, a portion with a high fiber basis weight has a high capillary force, and a portion with a low fiber basis weight has a low capillary force.

  In the napkin 1, as shown in FIG. 4, the wall portion 21 </ b> W, 22 </ b> W between the top portion 21 </ b> T of the skin-side protruding portion 21 and the top portion 22 </ b> T of the non-skin-side protruding portion 22 is The fiber basis weight is higher than the fiber basis weight of the top portion 21T of the skin-side protruding portion 21 and the fiber basis weight of the top portion 22T of the non-skin-side protruding portion 22. Preferably, in the napkin 1, the wall portion 21W of the skin side protruding portion 21 (the wall portion 22W of the non-skin side protruding portion 22) has a fiber basis weight of the top portion 21T and the non-skin protruding portion 22 of the skin side protruding portion 21. It is higher than the fiber basis weight of both the top portions 22T. In particular, in the napkin 1, the fiber basis weight increases in the order of the top portion 22T <the top portion 21T of the skin-side protruding portion 21 <the wall portion 21W of the skin-side protruding portion 21 (the wall portion 22W of the non-skin-side protruding portion 22). . Therefore, also regarding the capillary force, the capillary force increases in the order of the top portion 22T <the top portion 21T of the skin-side protruding portion 21 <the wall portion 21W of the skin-side protruding portion 21 (the wall portion 22W of the non-skin-side protruding portion 22). In this case, the fiber basis weight and the capillary force are gradually and gradually increased in the order of the top portion 22T <the top portion 21T of the skin-side protruding portion 21 <the wall portion 21W of the skin-side protruding portion 21 (the wall portion 22W of the non-skin-side protruding portion 22). It may be increased or may be increased step by step. As described above, excretion such as menstrual blood absorbed from the skin side surface of the surface sheet 2 is transferred to the non-skin side surface due to the difference in capillary force due to the change in density from the skin side protruding portion 21 to the non-skin side protruding portion 22 of the top sheet 2. This makes it possible to reduce the amount of remaining excretion liquid and the amount of liquid return on the skin side surface of the top sheet 2. Moreover, since the excretion liquid becomes easy to transfer to the absorber 4 because the fiber basis weight of the top portion 22T is low, the speed at which the excretion liquid is absorbed increases.

The value of the fiber basis weight of the top sheet 2 is expressed by a value obtained by converting the number of fibers in the visual field at the measurement location per unit area, as will be described later. The value of the fiber basis weight is preferably ² / mm ² or more, particularly 10 / mm ² or more, particularly 100 / mm ² or less, particularly 80 with respect to the top portion 22T of the non-skin-side protruding portion 22. / Mm ² is preferable, specifically 2 / mm ² or more and 100 / mm ² or less is preferable, and 10 / mm ² or more and 80 / mm ² or less is more preferable. preferable. Further, the top 21T of the skin-side protruding portion 21 is preferably 30 pieces / mm ² or more, particularly preferably 50 pieces / mm ² or more, and 130 pieces / mm ² or less, particularly 120 pieces / mm ² or less. Specifically, it is preferably 30 / mm ² or more and 130 / mm ² or less, more preferably 50 / mm ² or more and 120 / mm ² or less. In addition, the wall 21W of the skin-side protruding portion 21 (the wall portion 22W of the non-skin-side protruding portion 22) is preferably 30 pieces / mm ² or more, particularly preferably 50 pieces / mm ² or more, and 200 pieces / mm. ² or less, particularly preferably 150 present / mm ² or less, particularly preferably 30 present / mm ² or more 200 present / mm ² or less, 50 present / mm ² or more 150 present / mm ² More preferably, it is as follows. The fiber basis weight of the top portion 21T of the skin-side protruding portion 21 is measured at a position near the center of the layer thickness T _{L1 at} the top portion 21T. The fiber basis weight of the top portion 22T of the non-skin-side protruding portion 22 is measured at a position near the center of the layer thickness T _{L2 at} the top portion 22T. Wall 21W of the skin-side projection 21 fiber basis weight of the (non-wall portion 22W of the skin side protruding portion 22), the entire thickness of the intermediate vicinity of the sheet thickness _{T S,} the layer thickness _{T L3} in the wall portion 21W Measured at a position near the center. The method for measuring the fiber basis weight is as follows.

<Measurement method of fiber basis weight>
The cut surface of the surface sheet 2 is magnified and observed using a scanning electron microscope (adjusted to a magnification capable of measuring about 30 to 60 fiber cross sections; 150 to 500 times), and the above-mentioned per unit area (about 0.5 mm ² ). Count the number of cross-sections of the fibers being cut by the cut surface. Next, it is converted into the number of cross-sections of fibers per 1 mm ² and this is defined as the fiber basis weight. The measurement is performed at three locations, and the average is the fiber basis weight of the sample.
Scanning electron microscope: JCM-5100 (trade name) manufactured by JEOL Ltd.

  Moreover, even if the compression rate is the body pressure at the time of wearing, and the skin side protrusion part 21 is crushed by the inward pressing force by a wearer's thigh, the shape of the protrusion part 21 is the original shape. From the viewpoint of suppressing the liquid return from the body fluid remaining in the gap of the absorber slit 43, it is preferably 40% or more, particularly preferably 60% or more, and preferably 95% or less, particularly preferably 90% or less. Specifically, it is preferably 40% or more and 95% or less, and more preferably 60% or more and 90% or less. The compression rate of the topsheet 2 can be measured using a KES compression tester. It can be evaluated that the larger the value measured using a KES compression tester, the better the cushioning property. The compression ratio of the surface sheet 2 by the KES compression tester is “Standardization and analysis of texture evaluation (2nd edition)” [Kitsuo Kawabata, Japan Textile Machinery Society, Texture Measurement and Standardization Research Committee (Showa 55) July 10, 2011)], and is a physical property relating to the compression characteristics of the fabric. The measuring method of the compression rate of the surface sheet 2 by the KES compression tester is as follows.

<Measurement method of compression rate>
As a measuring device, a KES-FB3 compression tester manufactured by Kato Tech is used. Using this tester, to measure the thickness _{T 0} under 0.5 gf / cm ² load of the sample (surface sheet 2) by the compression area 2 cm ^2. Next, the sample is compressed at a pressing speed of 10 μm / second. The load increases with compression. Compression is performed until the load reaches 50 gf / cm ² . Then, to measure the thickness _{T m} of a under 50 gf / cm ² load. The value obtained by subtracting the thickness T _m from the thickness T ₀ divided by the thickness T _0, in which the multiplying by 100 to calculate the compression ratio of the surface sheet 2 by the compression tester (%). That is, the compression rate (%) is calculated from (T ₀ −T _m ) / T ₀ × 100.

In addition, the surface sheet 2 has good compressive energy and skin side when the skin-side protruding portion 21 comes into contact with the skin due to body pressure during wearing and inward pressing force by the wearer's thigh. From the viewpoint that the protrusion 21 follows the movement of the body, it is preferably 0.98 mN · m / cm ² or more, particularly preferably 3.43 mN · m / cm ² or more, 9.8 mN · m / cm ² or less, In particular, it is preferably 6.86 mN · m / cm ² or less, specifically 0.98 mN · m / cm ² or more and 9.8 mN · m / cm ² or less, preferably 3.43 mN · m 2. / Cm ² or more and 6.86 mN · m / cm ² or less is more preferable. The compression energy of the top sheet 2 can be measured using a KES compression tester. It can be evaluated that the surface sheet 2 is softer as the WC value measured using the KES compression tester is larger. The measuring method of the compression energy of the surface sheet 2 by the KES compression tester is as follows.

<Measurement method of compression energy>
As a measuring device, a KES-G5 handy compression tester manufactured by Kato Tech is used. Using this testing machine, a 5 cm × 10 cm sample (surface sheet 2) is prepared and attached to a test bench. Next, the material is compressed between steel plates having 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 energy (WC) of the top sheet 2 is expressed by the following equation. T _{m, T 0} 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.

Regarding the thickness of the surface sheet 2, the entire thickness of the sheet thickness T _S, local thickness of the surface sheet 2 which is curved to the unevenness when the surface sheet 2 and a side view as shown in FIG. 5 the layer thickness _{T L} a of. Sheet thickness _{T S} is may be adjusted as appropriate depending on the application, when used as a topsheet for an absorbent article such as a catamenial, preferably 1mm or 3.5mm or less, more preferably 1.2mm or more 2.5mm or less . By setting it as this range, the bodily fluid absorption speed | velocity at the time of use is quick, the liquid return from an absorber is suppressed, and also moderate cushioning property is realizable.

The layer thickness _TL may be different in each part in the topsheet 2 and may be appropriately adjusted depending on the application. When used as a top sheet for absorbent articles such as sanitary products, the layer thickness T _{L1 at} the top portion 21T of the skin-side protruding portion 21> the wall portion 21W of the skin-side protruding portion 21 (the wall portion 22W of the non-skin-side protruding portion 22). It is preferable that the layer thickness T _L3 is smaller in the order of the layer thickness T _L2 at the top portion 22T of the non-skin-side protruding portion 22. Thereby, in the top part 21T of the skin side protrusion part 21, the fiber basis weight is low especially on the skin facing surface side, and good skin contact can be realized. On the other hand, the wall portion 21W of the skin-side protruding portion 21 (the wall portion 22W of the non-skin-side protruding portion 22) has a high fiber basis weight, is not easily crushed, and is excellent in cushioning and liquid absorption speed without being out of shape. The surface sheet 2 can be obtained.

The sheet thickness T _S and the layer thickness T _L are measured by the following methods.
Method of measuring the thickness of the sheet T _S is in a state where the surface sheet 2 under a load of 0.05 kPa, measured using a thickness gauge. A laser displacement meter manufactured by OMRON Corporation is used for the thickness measuring instrument. Thickness is measured at 10 points, and the average value is calculated as the thickness. Also, measurement of the layer thickness T _L cuts the topsheet 2 along the thickness direction using a feather razor (No. FAS-10, manufactured by Feather Safety Razor Co.). And the thickness of each layer is measured by enlarging the section of the cut sheet about 20 times with a digital microscope VHX-900 made by Keyence.

The distance between the top portion 21T of the skin-side protruding portion 21 and the top portion 22T of the non-skin-side protruding portion 22 that is closest to the top sheet 2 in plan view may be appropriately adjusted depending on the application, and absorbs sanitary products and the like. When used as a surface sheet for a functional article, it is preferably from 1 mm to 15 mm, more preferably from 3 mm to 10 mm. Moreover, 2 mm or more and 30 mm or less are preferable, and, as for the space | interval L21 (refer FIG. 5) of the top parts 21T and 21T of the skin side protrusion part 21 adjacent to the horizontal direction Y in the surface sheet 2, 3 mm or more and 15 mm or less are more preferable. Moreover, 2 mm or more and 30 mm or less are preferable, and, as for the space | interval of the top parts 21T and 21T of the skin side protrusion part 21 adjacent to the vertical direction X in the surface sheet 2, 3 mm or more and 15 mm or less are more preferable. The basis weight of the surface sheet 2 may be appropriately selected depending on the application, when used as a topsheet for an absorbent article such as a catamenial an average value of the entire sheet is 15 g / m ² or more 50 g / m ² or less It is preferably 20 g / m ² or more and 40 g / m ² or less.

  In the napkin 1, the absorbent body 4 is formed from a laminated body of absorbent sheets 411 to 413, and has a plurality of slits 43 in the excretory part facing part B. Preferably, as shown in FIG. 6, the absorbent body 4 includes a main absorbent body 40 that forms the outer shape of the absorbent body 4 in plan view and the main absorbent body disposed in the excretory part-facing portion B. The auxiliary absorber 41 is smaller than 40.

  In the napkin 1, as shown in FIG. 2, the main absorbent body 40 has a substantially rectangular shape with rounded corners in plan view, and extends from the front part A to the rear part C through the excretory part facing part B. It is formed from a single absorbent sheet 411, 412 of the same shape and size. In addition, in the napkin 1, the auxiliary absorbent body 41 has a substantially rectangular shape in plan view as shown in FIG. The auxiliary absorbent body 41 is formed by folding a single absorbent sheet 413 into a two-layer structure, and is disposed between the two absorbent sheets 411 and 412 constituting the main absorbent body 40. As described above, the napkin 1 is formed by wrapping the auxiliary absorbent body 41 having a two-layer structure formed from the absorbent sheet 413 with the main absorbent body 40 formed from the two absorbent sheets 411 and 412. Yes.

  As shown in FIG. 2, the absorbent body 4 formed of the absorbent sheets 411 to 413 is formed of the main absorbent body 40 having a two-layer structure and the auxiliary absorbent body 41 having a two-layer structure on the excretory part facing portion B. The multi-layer part 42 has a four-layer structure. Further, the portion other than the multilayer portion 42 in the absorber 4 also has a two-layer laminated structure formed by the main absorber 40 having a two-layer structure. Here, as shown in FIG. 2, the multilayer portion 42 is a portion where the number of laminated absorbent sheets constituting the absorbent body 4 is larger than the portion positioned around the absorbent sheet. In the napkin 1, the multilayer part 42 is thicker than the part located around the napkin 1, and forms a raised part that protrudes on the top sheet 2 side (skin facing side of the napkin 1) on the excretory part facing part B. Yes. By arranging the auxiliary absorber 41 having a two-layer structure in a part of the main absorber 40, the absorption capacity of a part of the absorber 4 can be easily and efficiently increased. The absorbent sheets may not be joined, or may be joined by a sparsely spread adhesive or the like.

  The absorbent body 4 of the napkin 1 has a thickness in the multilayer portion 42 of preferably 0.7 mm or more, more preferably 1 mm or more, preferably 5 mm or less, more preferably 4 mm or less, more specifically. The thickness is preferably 0.7 mm or more and 5 mm or less, more preferably 1 mm or more and 4 mm or less. By making the thickness of the multilayer part 42 in such a range, it becomes easy to achieve both a good wearing feeling and high absorption performance in the excretory part facing part B where the multilayer part 42 is formed. Moreover, when the absorbent article is provided with a wing part like the napkin 1 of this embodiment, it becomes easy to suppress the twist of the absorber 4 in the excretion part opposing part B at the time of mounting | wearing. Further, the absorber 4 has a thickness in a portion other than the multilayer portion 42 of preferably 0.3 mm or more, more preferably 0.5 mm or more, and preferably 3 mm or less, more preferably 2.5 mm or less. More specifically, it is preferably 0.3 mm or more and 3 mm or less, more preferably 0.5 mm or more and 2.5 mm or less. This range is preferable from the viewpoint of enhancing the high absorption performance and the ability to follow the wearer's movement.

  Further, in the absorbent body 4 of the napkin 1, the thickness difference (step) between the middle high portion 42 and the peripheral portion thereof or at the vicinity thereof is preferably 2 mm or less, and more preferably 1.5 mm or less. . The purpose is to suppress the occurrence of twisting in the vicinity of the boundary between the middle-high portion 42 and the region where only the main absorber 40 in the peripheral portion exists in the excretory portion facing portion B. If this step is large, the napkin 1 tends to fill the gap due to the step when the napkin 1 follows the movement of the wearer during wearing. By setting within the range, the effect of suppressing the occurrence of twisting in the excretory part facing part B is enhanced. The thickness of each part of the absorber 4 described above is measured by the following method.

<Measurement method of absorber thickness>
The absorber, which is a measurement object, is placed in a horizontal place so as not to be wrinkled or bent, and the thickness under a load of 5 cN / cm ² is measured. A dial gauge thickness gauge (PEACOCK DIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG.CO.LTD.)) Is used for measuring the thickness. At this time, a circular plate or a square plate (acrylic plate having a thickness of about 5 mm) in plan view is disposed between the tip of the thickness meter and the measurement portion of the measurement object, and the load is 5 cN / cm ² . Adjust the size of the plate so that

  Moreover, in the napkin 1, as shown in FIG.1 and FIG.6, each slit 43 is distribute | arranged in parallel with the vertical direction X. As shown in FIG. That is, each slit 43 is a vertical slit extending in the vertical direction X. In the napkin 1, slits (vertical slits) 43 extending in the vertical direction X have excretory part slit regions 4 </ b> S formed in a state dispersed in both the vertical direction X and the horizontal direction Y.

  In the napkin 1, the slit 43 penetrates at least one layer on the most surface sheet 2 side in the laminate of the absorbent sheets 411 to 413 that form the absorbent body 4. In the napkin 1, as shown in FIG. 2, when the absorbent body 4 is viewed in a cross-section along the lateral direction Y, the slit (vertical slit) 43 is 1 on the most surface sheet 2 side in the absorbent body 4 having a four-layer structure. It penetrates not only through the absorbent sheet 411 that forms the layers, but also through all the layers of the four-layer laminate. That is, the slit (vertical slit) 43 penetrates through the absorber 4 in the entire thickness direction. Since the vertical slit 43 completely penetrates the absorber 4, the liquid that has reached the absorber 4 easily reaches the non-skin facing surface side of the absorber 4 and can be absorbed efficiently. become. Further, preferably, the vertical slit 43 is formed by making a notch penetrating the absorbent body 4 in the thickness direction in each part of the excretion part facing part B other than the multilayer part 42 and the multilayer part 42. As shown in FIG. 6, the excretion part slit region 4 </ b> S in which the plurality of vertical slits 43 are arranged extends not only to the excretion part facing part B but also to a part of the front part A and a part of the rear part C.

  In the napkin 1, as shown in FIG. 3, the slit 43 is formed so that the opening width on the top sheet 2 side is smaller than the opening width on the back sheet 3 side. The opening width on the surface sheet 2 side in the slit 43 is preferably 0.05 mm or more, more preferably 0.7 mm or more, preferably 1.2 mm or less, more preferably 1.0 mm or less, and more specifically. Specifically, it is preferably 0.05 mm or more and 1.2 mm or less, more preferably 0.07 mm or more and 1.0 mm or less. Further, the opening width on the back sheet 3 side in the slit 43 is preferably 0.1 mm or more, more preferably 0.2 mm or more, preferably 1.5 mm or less, more preferably 1.2 mm or less, More specifically, it is preferably 0.1 mm or more and 1.5 mm or less, and more preferably 0.2 mm or more and 1.2 mm or less. The opening area of the slit 43 of the absorber 4 described above is measured by the following method.

<Measurement method of slit opening width>
The opening width of the slit 43 can be increased by taking out the absorber 4 from the napkin 1, placing the extracted absorber 4 horizontally, and adjusting the measurement magnification with the KEYENCE digital microscope VHX-900 to enlarge it. taking measurement.

  In the napkin 1, as shown in FIG. 1, each vertical slit 43 has a width W43 (see FIG. 6), which is the length in the lateral direction, the top of the skin-side protruding portion 21 adjacent to the lateral direction Y in the topsheet 2. It is formed narrower than the distance L21 (see FIG. 5) between 21T and 21T. Here, the width W43 of the vertical slit 43 is the maximum width at the opening located closest to the topsheet 2 side. Further, the distance L21 between the top portions 21T and 21T is formed narrower than the distance L43 (see FIG. 6) between the vertical slits 43 in the same slit row extending in the horizontal direction Y. Here, the slit width W43 refers to the length of the slit in a direction orthogonal to the direction in which the slit extends. In addition, the width of the slit referred to here is the maximum width of the width in a natural state where no tension is applied before the absorbent article is fixed to the crotch portion or the like of clothing, and the body fluid is absorbed by the absorbent body 4. It means the width before making it happen. Specifically, the width (W43) of the slit (vertical slit) 43 when each slit (vertical slit) 43 is viewed in plan is preferably 0.1 mm or more, more preferably 0.3 mm or more, and preferably 1 mm or less, 0.8 mm or less is more preferable, 0.1 mm or more and 1 mm or less is preferable, and 0.3 mm or more and 0.8 mm or less is more preferable.

The ratio ((L21 / L43) × 100) of the interval L21 (see FIG. 5) between the top portions 21T of the skin-side protruding portion 21 to the interval L43 (see FIG. 6) between the vertical slits 43 is the position of the vertical slit 43, The position of the top portion 21T of the skin-side protruding portion 21 overlaps with the top sheet 21T during the wearing of the top sheet 21T to minimize the occurrence of the folding portion of the top portion 21T and maintain the fit of the product. In order to maintain good touch, it is preferably 10% or more, more preferably 30% or more, preferably 70% or less, more preferably 55% or less, and 10% % Or more and 70% or less, and more preferably 30% or more and 55% or less.
Specifically, in the napkin 1, the interval L43 between the vertical slits 43 (see FIG. 6) is preferably 3 mm or more, more preferably 7 mm or more, preferably 20 mm or less, more preferably 15 mm or less. Preferably they are 3 mm or more and 20 mm or less, More preferably, they are 7 mm or more and 15 mm or less.

  In the napkin 1, the arrangement of the slits in the excretory part slit region 4S is not particularly limited as long as each slit is distributed in both the vertical direction X and the horizontal direction Y, but in the form shown in FIG. In addition, when the vertical slits 43 along the vertical direction X are included, it is preferable that a plurality of vertical columns L formed of a plurality of vertical slits 43 arranged in series along the vertical direction X of the napkin 1 are formed in the horizontal direction Y. . Moreover, in the napkin 1, the arrangement | positioning in which the position of the vertical direction X of the vertical slit 43 in the vertical columns L and L adjacent to the horizontal direction Y does not correspond is preferable.

  In the napkin 1, the excretion part slit area 4S is formed so as to include a multilayer part 42 as shown in FIG. In the multi-layer part 42, it is preferable that two or more slit rows composed of two or more vertical slits 43 separated in the horizontal direction Y are formed in the vertical direction X, and three or more rows are formed in the vertical direction X. It is more preferable that four or more rows are formed. Further, the number of vertical slits 43 spaced apart in the horizontal direction X included in each slit row is preferably 2 or more, and more preferably 3 or more. In the longitudinal direction X of the excretion part slit region 4S, in addition to the slit rows included in the multilayer part 42, one or more slits are provided in the front or rear of the longitudinal direction X from the multilayer part 42 or both forward and backward. It is preferable to have a row.

  In FIG. 7, the example of the preferable arrangement | positioning of the vertical slit 43 in the excretion part slit area | region 4S is shown. In the arrangement shown in these drawings, a plurality of slit rows R1 and R2 composed of a plurality of vertical slits 43 spaced apart in the horizontal direction Y of the napkin 1 are alternately formed in the vertical direction X of the napkin 1. In the arrangement example shown in FIG. 7, the slit row R1 composed of two vertical slits 43 spaced apart in the horizontal direction Y and the slit row R2 composed of three vertical slits 43 spaced apart in the horizontal direction Y are in the vertical direction. X is alternately formed.

  In the example of the preferred arrangement of the vertical slits 43 shown in FIG. 7, as shown in FIGS. 7A and 7B, the vertical slits 43 in the two slit rows R1 and R2 adjacent in the vertical direction X are The vertical slit 43 of one slit row R1 is arranged at the center between the vertical slits 43, 43 adjacent to each other in the horizontal direction Y in the other slit row R2. And there is no space between the slit rows R1, R2 adjacent to each other in the vertical direction X of the napkin 1. That is, no gap is provided between the two slit rows R1 and R2 adjacent in the vertical direction X. In the expression that there is no interval between the adjacent slit rows, as shown in FIG. 7A, when the positions of the ends of the vertical slits 43 of the adjacent slit rows R1 and R2 match, As shown in FIG. 7B, the case where the ends of the vertical slits 43 of the adjacent slit rows R1 and R2 overlap in the vertical direction X is included. As shown in FIG. 7B, when the end portions of the vertical slits 43 of the two slit rows R1, R2 are overlapped in the vertical direction X, the overlapping length L1 is the slit row. It is preferably 20% or less of the length L2 in the same direction X of the vertical slits 43 constituting, and more preferably 10% or less.

  The napkin 1 has, on one vertical slit 43, a slit in which the top portions 21 </ b> T and 21 </ b> T of the two skin-side protruding portions 21 and 21 in the topsheet 2 are arranged. The napkin 1 only needs to have one vertical slit 43 in which the top portions 21T and 21T of the at least two skin-side protruding portions 21 and 21 are arranged upward, and the top portions of the two skin-side protruding portions 21 and 21. It is preferable to have a plurality of vertical slits 43 with 21T and 21T arranged upward, and all the vertical slits 43 have tops 21T and 21T of the two skin-side protruding portions 21 and 21 above. More preferably. Moreover, in the napkin 1, the length L2 (refer FIG. 7) of the vertical slit 43 is formed more widely than the space | interval of the top parts 21T and 21T of the skin side protrusion part 21 adjacent to the vertical direction X in the surface sheet 2. FIG. It is preferably 10 mm or more, more preferably 15 mm or more, preferably 35 mm or less, more preferably 25 mm or less, preferably 10 mm or more and 35 mm or less, more preferably 15 mm or more and 25 mm or less. .

  In the excretion part facing part B, the napkin 1 absorbs the hollow part in which the space between the skin-side protruding part 21 and the absorbent body 4 of the topsheet 2 has a hollow structure, and the non-skin-side protruding part 22 of the topsheet 2. The body 4 is provided with a non-crimped part that is not crimped. Hereinafter, the said part provided with this hollow part and this non-crimping part in the excretion part opposing part B is called a hollow maintenance part. Specifically, the surface sheet 2 and the absorbent body 4 are not pressure-bonded at a portion other than the linear pressing groove 8 in the excretion portion facing portion B of the napkin 1, and each skin-side protruding portion 21 of the surface sheet 2 A hollow portion having a hollow structure is formed between the absorber 4 and the absorber 4. Moreover, in parts other than the linear pressing groove 8 in the excretion part opposing part B of the napkin 1, the surface sheet 2 and the second sheet 9 are not crimped | bonded, and the non-skin side protrusion part 22 of the surface sheet 2 and the absorber 4 And a non-crimped part that is not crimped. That is, the hollow maintenance part in the excretion part opposing part B means a part other than the linear pressing groove 8 in the excretion part opposing part B in the napkin 1. As a pressure bonding means for the linear compressed groove 8, thermocompression bonding is particularly preferable among the pressure bonding. Here, “thermocompression bonding” is different from heat fusion in which the constituent fibers constituting the surface sheet 2 are fixed to form a nonwoven fabric shape, and embossing or the like is performed while the surface sheet 2 and the absorbent body 4 are heated. Means that the surface sheet 2 is pressed and compressed.

  In a portion other than the linear pressing groove 8 in the excretion part facing part B of the napkin 1, when the top sheet 2 is viewed in cross-section along one of the two different directions intersecting each other, a plurality of top sheets 2 are provided. Internal space S1 which forms the hollow structure between the skin side protrusion part 21 and the absorber 4 is connected. Preferably, in the napkin 1, each internal space S1 is not separated (not independent), and as shown in FIG. 5, for example, the surface along the lateral direction Y which is one of the two directions. When the sheet 2 is viewed in cross section, the internal spaces S1 and S1 of the plurality of skin-side protrusions 21 adjacent in the diagonal direction between the vertical direction X and the horizontal direction Y are connected to each other, and the internal spaces S1 and S1 are connected to each other. Are spread in the surface direction formed from the vertical direction X and the horizontal direction Y.

In the napkin 1, an adhesive is applied between the top sheet 2 and the absorbent body 4 and fixed. The adhesive can be applied using a known means such as a slot coat gun, a spiral spray gun, a spray gun, or a dot gun. In the napkin 1, the adhesive can be applied in a spiral shape using a spiral spray gun. preferable. As the adhesive to be applied, for example, a hot melt adhesive is preferably used. The application amount of the hot melt adhesive is preferably 1.5 g / m ² or more and 10 g / m ² or less. In addition, between the absorber 4 and the back surface sheet 3 may also be joined by the adhesive agent.

The formation material of each structural member of the napkin 1 of this embodiment mentioned above is demonstrated.
As the surface sheet 2, an air-through nonwoven fabric having a single-layer structure or a multilayer structure in which a plurality of layers are laminated is used as a raw material nonwoven fabric, and is suitable by, for example, the method described in JP2013-133574A The manufactured sheet can be used. The surface sheet 2 manufactured by the method described in JP2013-133574A has a configuration in which there is no heat fusion part for forming the sheet having the skin-side protruding part 21 and the non-skin-side protruding part 22 into a sheet shape. It has become.

  As the back sheet 3, various kinds of materials conventionally used for the back sheet of absorbent articles can be used without any particular limitation. For example, liquid-impermeable or water-repellent resin film, moisture-permeable film, resin film A laminate sheet of a non-woven fabric and the like can be used.

  As the absorbent sheets 411 to 413 constituting the absorbent body 4, between the constituent fibers and between the constituent fibers and the water absorption through the adhesive force generated in the wet water-absorbing polymer or a binder such as an adhesive or an adhesive fiber added separately. A sheet formed by bonding with a functional polymer can be preferably used. Further, as the absorbent sheet, an absorbent sheet manufactured by the method described in JP-A-8-246395, pulverized pulp supplied in an air stream and a water-absorbing polymer are deposited, and then an adhesive (for example, acetic acid) is used. Dry sheets hardened with vinyl-based adhesives, PVA, etc.) Absorbent sheets obtained by spraying a superabsorbent polymer after applying a hot melt adhesive between paper and nonwoven fabric, spunbond or meltblown nonwoven fabric An absorbent sheet obtained by blending a superabsorbent polymer during the production process can be used. These absorptive sheets can be used as a sheet-like absorber by cutting one sheet into a predetermined shape.

  Further, as in the case of the napkin 1, in order to form the slit 43 in the absorbent body 4, the laminate of the absorbent sheet may be partially cut by a known cutting means, for example, on the circumferential surface of the roll. A cutting device provided with a cutter roll in which a number of cutting blades extending in the direction are dispersed in the circumferential direction and the axial length direction of the roll and an anvil roll that receives the blade of the cutter roll can be used. In particular, as in the case of the slit 43 of the napkin 1, when the opening area on the top sheet 2 side is formed smaller than the opening area on the back sheet 3 side, the cutting blade is used and the absorber 4 on the back sheet 3 side is used. It can be formed by pressing the cutting blade from the surface.

  Examples of the water-absorbing polymer constituting the absorbent body 4 include, for example, sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, cross-linked sodium polyacrylate, (starch-acrylic acid) graft copolymer, (Isobutylene-maleic anhydride) copolymer and saponified product thereof, polyaspartic acid and the like can be mentioned. Moreover, it is preferable that any of the absorbent sheets constituting the absorbent body 4 is a water absorbent sheet containing a water absorbent polymer, but it does not contain a water absorbent sheet containing a water absorbent polymer and a water absorbent polymer. It is good also as a laminated body of the water absorptive sheet which comprises an absorber by combining a water absorptive sheet.

  As the side sheet 5, various types conventionally used in the technical field can be used without particular limitation, for example, a liquid-impermeable or water-repellent resin film, a laminate of a resin film and a nonwoven fabric, or the like. Can be used. As other materials, for example, a spunbond nonwoven fabric, a sheet (for example, SM, SMS, SMMS, etc.) in which a spunbond nonwoven fabric (S) and a melt blown nonwoven fabric (M) are combined, a heat roll nonwoven fabric, an air-through nonwoven fabric, etc. A water-repellent (hydrophobic) non-woven fabric may be mentioned. In particular, it is preferable to use a water-repellent air-through non-woven fabric from the viewpoint of touch and prevention of lateral leakage.

  As a method for forming the wing portion adhesive portion 71 and the main body adhesive portion 72 (displacement preventing portion), a method conventionally used for absorbent articles used by being fixed to clothing such as underwear can be used without particular limitation. For example, the pressure-sensitive adhesive can be formed by directly applying to the back sheet 3, or the other side of the pressure-sensitive adhesive tape coated with the pressure-sensitive adhesive can be bonded to the back sheet. Examples of the pressure-sensitive adhesive used for forming the pressure-sensitive adhesive portion include emulsion-based, water-based, and solvent-based pressure-sensitive adhesives. Moreover, it is preferable that the misalignment preventing portion is formed by applying a pressure sensitive adhesive such as a hot melt pressure sensitive adhesive from the viewpoint of obtaining excellent displacement prevention performance and stable productivity. As such an adhesive, those usually used for this type of article can be adopted without limitation, but it is preferable to use a synthetic rubber-based block copolymer having a basic structure similar to natural rubber. . Examples of such a block copolymer include styrene-isoprene-styrene block copolymer (SIS), styrene-ethylene-propylene-styrene copolymer (SEPS), and styrene-butadiene-styrene block copolymer (SBS). And styrene-ethylene-butylene-styrene copolymer (SEBS). The pressure-sensitive adhesive preferably contains 10 to 65% by weight, particularly 30 to 50% by weight, of one or more base polymers selected from these block copolymers. In addition, as long as the gap prevention part can prevent the gap between an absorptive main body and the clothing which fixes it, it may not be adhesive.

  The linear pressing groove 8 (the first horizontal pressing groove 81, the vertical pressing groove 82, and the second horizontal pressing groove 83) is a pressing process with or without heat (a so-called embossing process) or an embossing process such as ultrasonic embossing. Can be formed according to a conventional method.

The effect of the napkin 1 mentioned above is demonstrated.
In the napkin 1, the slit 43 of the absorbent body 4 improves the fit of the product by the slit 43 of the absorbent body 4, and the excreted body fluid can be quickly absorbed into the absorbent body 4. Here, as shown in FIG. 4, the top sheet 2 is a concavo-convex structure sheet having a plurality of skin-side protrusions 21 having an internal space S1 and a plurality of non-skin-side protrusions 22 having an internal space S2. There are few parts which contact the absorber 4. As shown in FIG. 2, a hollow structure is formed between each skin-side protruding portion 21 of the top sheet 2 and the absorbent body 4. Therefore, even if the bodily fluid excreted in the slight gap of the slit 43 in the absorbent body 4 remains, the bodily fluid is difficult to move to the top sheet 2. Moreover, as shown in FIG. 3, since the fiber basic weight of the wall part 21W of the skin side protrusion part 21 is higher than the fiber basic weight of the top part 21T of the skin side protrusion part 21, a bodily fluid is a skin side protrusion part. It is difficult to move to the top portion 21T side of the body 21, and the liquid return of the body fluid absorbed by the absorber 4 can be suppressed. Further, when the napkin 1 is worn, the skin-side protruding portion 21 of the topsheet 2 is crushed by body pressure, and the body fluid remaining by contacting the body fluid remaining in the slight gap of the absorber slit 43 is removed from the skin-side protruding portion 21. Sucks up. Since the fiber basis weight of the wall part 21W of the skin side protrusion part 21 is higher than the fiber basis weight of the top part 21T of the skin side protrusion part 21, the skin side protrusion part 21 and the non-skin side protrusion part 22 are crushed. Even so, it is easy to return to the original, and the sucked body fluid is absorbed again into the absorbent body 4 due to the effect of the density gradient between the top portion 21T and the wall portions 21W and 22W, and the liquid return of the body fluid can be suppressed. In addition, no liquid remains and a dry feeling can be maintained.

  Moreover, in the napkin 1, in parts other than the linear pressing groove 8 in the excretion part opposing part B, when shown in cross section as shown in FIG. 5, the several skin side protrusion part 21 of the surface sheet 2, the absorber 4, and The internal spaces S1 and S1 that form a hollow structure are connected to each other, and the connection between the internal spaces S1 and S1 extends in the plane direction formed from the vertical direction X and the horizontal direction Y. Therefore, the excreted body fluid can be absorbed into the absorber 4 more quickly, and the return of the body fluid absorbed by the absorber 4 can be further suppressed.

  Moreover, in the napkin 1, as shown in FIG. 1, when the surface sheet 2 is viewed in plan, the skin-side protrusions 21 and the non-skin-side protrusions 22 are alternately continued along two different directions intersecting each other. Therefore, the skin-side protruding portion 21 can easily follow the movement of the wearer in any direction, and the fit at the time of wearing is improved. Moreover, the slit 43 which the absorber 4 has is a vertical slit, and the excretory part slit area | region 4S where the several vertical slit 43 was distribute | arranged is not only the excretion part opposing part B but the front part A as shown in FIG. And part of the rear part C. Therefore, it is easy to bend | fold from the vertical slit 43, and the fitting property at the time of wear improves.

    Moreover, the napkin 1 is a slit in which the top portions 21T and 21T of the two skin-side projecting portions 21 and 21 in the topsheet 2 are arranged on one vertical slit 43 as shown in FIGS. have. Therefore, when the napkin 1 is worn, the skin-side protruding portion 21 of the surface sheet 2 is crushed by body pressure, and after the top portion 21T comes into contact with the body fluid remaining in the slight gap of the slit 43 in the absorbent body 4, the crushed skin-side protruding The part 21 returns to its original shape, and the body fluid moves to the top part 21T. Since the fiber basis weight of the wall portions 21W and 22W of the skin-side protruding portion 21 is higher than the fiber basis weight of the top portion 21T of the skin-side protruding portion 21, body fluid easily shifts to the wall portions 21W and 22W and has shifted. The body fluids in the wall portions 21 </ b> W and 22 </ b> W are easily transferred again to the absorber 4 through the top portion 22 </ b> T of the non-skin-side protruding portion 22. Since the body fluid easily moves in this way, it is possible to suppress liquid return from the body fluid that is absorbed by the absorber 4 and remains in the slight gap of the slit 43. Moreover, even if the skin side protrusion part 21 does not contact the slit 43, liquid return can be suppressed from forming the hollow structure. In particular, in the napkin 1, when the through hole 23 is formed in the top portion 22 </ b> T of the non-skin-side protruding portion 22, body fluid can be absorbed more quickly by capillary force, and the penetration of the top portion 22 </ b> T of the non-skin-side protruding portion 22 can be achieved. Body fluid can be transferred to the absorbent body 4 through the holes 23.

  Moreover, in the napkin 1, as shown in FIG. 2, the slit (vertical slit) 43 has penetrated all the layers of the absorber 4 provided with the multilayer part 42 of 4 layer structure, and the slit 43 is shown in FIG. Thus, the opening width on the top sheet 2 side is formed smaller than the opening width on the back sheet 3 side. Therefore, the bodily fluid excreted by the capillary force at the peripheral edge of the slit 43 on the side of the surface sheet 2 is likely to collect, and when the napkin 1 is worn, the skin-side protruding portion 21 of the surface sheet 2 is crushed by the body pressure. By contacting the body fluid remaining on the surface sheet 2 side of the gap of the slit 43, it becomes easy to suck up all the body fluid remaining in the slit 43. Since the fiber basis weight of the wall portion 21W of the skin-side protruding portion 21 is higher than the fiber basis weight of the top portion 21T of the skin-side protruding portion 21, the body fluid easily shifts to the wall portion 21W. The body fluid is easily transferred to the absorber 4 through the top portion 22T of the non-skin-side protruding portion 22. Thus, there is almost no body fluid remaining in the gaps of the slits 43, and the body fluid sucked up at the top of the skin-side protruding portion 21 of the top sheet 2 easily moves to the absorbent body again. It is possible to further suppress the return of the body fluid absorbed by the liquid.

  Moreover, in the napkin 1, between the surface sheet 2 and the absorber 4, the adhesive agent is apply | coated and it fixes. Therefore, it is possible to prevent the slit (vertical slit) 43 from opening too much due to the movement of the wearer during wearing, to prevent the napkin 1 from twisting due to the slit (vertical slit) 43 being opened too much, and to improve the feeling of wear. .

As mentioned above, although this invention was demonstrated based on the preferable embodiment, the absorbent article of this invention is not restrict | limited to the napkin 1 of the said embodiment at all, and can be changed suitably.
For example, as shown in FIG. 4, the topsheet 2 of the napkin 1 has a plurality of skin-side protrusions 21 having an internal space S1 and a plurality of non-skin-side protrusions 22 having an internal space S2. When the surface sheet 2 is viewed in plan, the skin-side protrusions 21 and the non-skin-side protrusions 22 are sheets that are alternately and continuously arranged along two different directions intersecting each other. What is necessary is just to have the several skin side protrusion part 21 which has internal space S1, and the some non-skin side protrusion part 22 which has internal space S2. For example, as shown in FIG. 8, a skin-side protruding portion 24 having a streaky inner space S3 extending in the vertical direction X and a non-skin-side protruding portion 25 having a streaky inner space S4 extending in the vertical direction X, The sheet | seat of the uneven structure arrange | positioned alternately by the horizontal direction Y may be sufficient. Further, the skin-side protrusions 24 having the streaky inner space S3 extending in the lateral direction Y and the non-skin-side protrusions 25 having the streaky inner space S4 extending in the lateral direction Y are alternately arranged in the vertical direction X. It may be a sheet having an uneven structure. The concavo-convex structure sheet shown in FIG. 8 forms a concavo-convex structure by stretching a nonwoven fabric sheet with a pair of concavo-convex rolls that can be engaged with each other, The side area between the bottom area of the non-skin-side protruding part may be formed such that the fiber basis weight is lower than the fiber basis weight of the skin side top area and the fiber basis weight of the bottom area.

Moreover, in the napkin 1, as shown in FIG.1 and FIG.2, the surface sheet 2 and the absorber 4 face the back sheet 3 side at the skin facing surface (skin facing surface of the surface sheet 2) of the absorptive main body 10. Although the linear pressing groove 8 formed by recessing integrally is formed, the linear pressing groove 8 may not be formed.
Moreover, in the napkin 1, although the absorber 4 is formed from the laminated body which folded the absorbent sheets 411-413, what laminated | stacked and laminated | stacked the several sheets of absorbent sheet may be sufficient. In addition, the absorbent sheet can be folded in various ways.

  Moreover, although the some slit 43 which the absorber 4 of the napkin 1 has is a vertical slit, as shown in FIG.1 and FIG.6, a horizontal slit along the horizontal direction of the napkin 1 may be sufficient, and a vertical direction A slit extending in an oblique direction having an angle with respect to both X and the horizontal direction Y may be used, or a vertical slit and a horizontal slit may be mixed. Further, as shown in FIG. 2, the plurality of slits 43 included in the absorbent body 4 of the napkin 1 penetrate all the layers of the absorbent body 4 in the thickness direction, but at least one layer penetrates. Good. From the viewpoint of further suppressing liquid return, at least one layer on the skin surface side is penetrated, and when the auxiliary absorbent body 41 is provided in the multilayer portion 42, it is more preferable that the auxiliary absorbent body 41 also penetrates.

  Moreover, the excretion part slit area | region 4S of the absorber 4 of the napkin 1 may be formed only in the excretion part opposing part B, or even if it extends to a part of the back part C from the excretion part opposing part B. Alternatively, it may extend from the excretory part facing part B to a part of the front part A and a part of the rear part C. Further, the number of laminated absorbent sheets in the multilayer portion 42 may be two or three instead of four, or may be five or more. Further, the difference in the number of laminated absorbent sheets between the multilayer portion 42 and other portions may be one or three or more.

  In addition to the sanitary napkin, the absorbent article of the present invention may be a panty liner (cage sheet), an incontinence pad, or the like.

  Hereinafter, the absorptive article of the present invention is explained still in detail by an example. However, the scope of the present invention is not limited by the examples.

<Example 1>
A sanitary napkin having the same basic structure as that of the sanitary napkin 1 shown in FIGS. 1 to 3 having the surface sheet shown in FIGS. 4 and 5 was prepared and used as a sample of Example 1. As the surface sheet, a sheet manufactured by the method described in JP2013-133574A was used. The top sheet was measured so that the upper layer had a core of polyethylene terephthalate and the sheath was made of polyethylene at 2.4 dtex and a basis weight of 10 gsm, and the lower layer was made of a core of polyethylene terephthalate and the sheath was made of polyethylene with a 2.9 dtex fiber having a basis weight of 15 gsm. It was adjusted to 25 g / ^{m 2,} to adjust the overall thickness _{T S} of the surface material to 1.7 mm. The fiber basis weight value of the top portion 22T of the non-skin-side protruding portion is 32 / mm ² , and the fiber basis weight value of the top portion 21T of the skin-side protruding portion is 39 / mm ² , The value of the fiber basis weight of the wall portion 21W was 46 pieces / mm ² . Further, in the topsheet, an interval L21 between the top portions 21T and 21T of the skin-side protruding portions adjacent in the lateral direction Y is 5 mm, and an interval between the top portions 21T and 21T of the skin-side protruding portions adjacent in the longitudinal direction X is 7 mm. Met. The longitudinal slit of the absorbent body formed by the absorbent sheet has a lateral width W43 of 0.3 mm, a longitudinal length L2 of 20 mm, and an interval L43 between the longitudinal slits. Was 10 mm.

<Comparative Example 1>
In the sample of Example 1, the surface sheet was changed to the surface sheet 200 shown in FIG. 9, and the sample of Comparative Example 1 was produced in the same manner as in Example 1 except that. As the surface sheet 200, it consists of a fiber sheet of a single layer structure, and the recessed part 201 formed by crimping | combining the component fiber is distribute | arranged to the diagonal grid | lattice form. A large number of partitioned areas 202 partitioned by slanted grid-shaped depressions 201 are formed on the topsheet 200. Each partition region 202 is a convex portion that protrudes relative to the hollow portion 201. Therefore, the top sheet 200 is a concavo-convex sheet having a large number of dent portions 201 formed in an oblique lattice shape and a plurality of partition regions 202 that are convex portions surrounded by the dent portions 201. In addition, the inside of the partition area | region 202 which is a convex part is satisfy | filled with the constituent fiber of the surface sheet 200. FIG. Further, the topsheet 200 has a basis weight of 25 g / ^{m 2,} the width of the recess 201 is 0.5 mm, the area of the partition area 202 was 0.45 cm ^2.

[Evaluation]
About the sample (sanitary napkin) of Example 1 and Comparative Example 1, the liquid absorption time, the sucked-up residual amount, the liquid return amount, and the diffusion area were evaluated by the following methods, respectively. The results are shown in Table 1 below.

<Liquid absorption time>
Each sample of the example and comparative example is spread and placed on a test bench, and an elliptical cylinder with an acrylic cylinder having a major axis of 50 mm, a minor axis of 22.5 mm, and a cylinder height of 30 mm is integrally formed on the sample. Place the acrylic injection plate so that the injection hole is located at the center of the excretory part facing part on the skin facing surface (surface sheet side) of the sample, and place an appropriate weight plate (injecting liquid) The load was adjusted to 5 g / m ^{2 (} including the plate itself). Nihon Biotest Co., Ltd. equine defibrinated blood was conditioned at room temperature (23 ° C.) in advance and weighed 6 g in a 10 cc injection beaker. The blood was poured all at once into the cylinder of the liquid injection plate, and the time (seconds) from the moment when the pouring was finished until the blood in the cylinder disappeared and the surface sheet of the sample was exposed was measured. Each sample was measured three times, and the average value was taken as the liquid absorption time of the sample.

<Remaining suction volume>
1 g of defibrinated horse blood (manufactured by Nippon Biotest Co., Ltd.) was dropped on a flat glass plate placed horizontally. On top of that, a sanitary napkin was placed with the top sheet facing down. After maintaining that state for 1 minute, the sanitary napkin was removed, and the amount of defibrinated horse blood remaining on the plate was measured. Measurement was performed three times for each sample, and the average value was taken as the remaining amount of siphoning of the sample.

<Liquid return amount after standing for 10 minutes>
After the liquid absorption time is measured, the sample is left in a pressurized state for 10 minutes, and then the liquid injection plate is removed together with the weight, and the liquid absorption part of the sample (the part into which the liquid is poured in the liquid absorption time measurement). A dynamic walking model in which 10 sheets of pre-weighed absorbent paper (length 170mm, width 70mm, basis weight 30g / cm2) are stacked on the surface of the sample, and the sample is quickly attached to the crotch part of the shorts. And walked for 1 minute. After walking, the model stopped moving, the absorbent paper was taken out and weighed, and the amount of liquid (g) absorbed by the absorbent paper was calculated. Each sample was measured three times, and the average value was taken as the liquid return amount of the sample.

<Liquid diffusion area>
Immediately after the measurement of the liquid return amount was completed, the OHP film was placed on the top sheet, and the outline of the portion where the top sheet spread in red was written. Using dedicated software (Image-ProPlus: manufactured by Nippon Roper Co., Ltd.) that can measure the area inside the contour, the image written on the OHP film was taken into a personal computer with a scanner, and the liquid diffusion area was determined. Each sample was measured three times, and the average value was defined as the liquid diffusion area of the sample.

  According to the results in Table 1, it was found that the sanitary napkin of Example 1 had a quicker liquid absorption time and a small amount of residual wicking compared to the sanitary napkin of Comparative Example 1. Therefore, compared with the sanitary napkin of Comparative Example 1, the sanitary napkin of Example 1 can be expected to quickly absorb the excreted body fluid into the absorbent body. Further, it was found that the sanitary napkin of Example 1 had the same liquid diffusion area as that of the sanitary napkin of Comparative Example 1, but the liquid return amount after being left for 10 minutes was small. Therefore, it can be expected that the sanitary napkin of Example 1 can suppress the return of bodily fluid absorbed by the absorbent body as compared with the sanitary napkin of Comparative Example 1.

1 Sanitary napkin (absorbent article)
10B Absorbent body 10W Wing part 10S Side flap part 10S
2 Surface sheet 21 Skin side protrusion 21T Top part of skin side protrusion 21W Wall part of skin side protrusion S1 Internal space 22 Non skin side protrusion 22T Top part of non skin side protrusion 22W Wall part of non skin side protrusion S2 Internal space 3 Back sheet 4 Absorber 411,412,413 Absorbent sheet 4S Excretion part slit area 40 Main absorbent body 41 Auxiliary absorber 42 Multilayer part 43 Vertical slit 5 Side sheet 61 First joint line 62 Second joint line 71 Wing Part adhesive part 72 Main body adhesive part 8 Linear pressing groove 81 First lateral pressing groove 82 Vertical pressing groove 83 Second lateral pressing groove

Claims (4)

A liquid-permeable surface sheet that forms a skin-facing surface, a back sheet that forms a non-skin-facing surface, and an absorbent body interposed between the two sheets are disposed to face the excretion part of the wearer when worn. An absorptive main body having an excretory part facing part, a front part disposed on the stomach side of the wearer from the excretion part facing part, and a rear part disposed on the back side of the wearer from the excretion part facing part An absorbent article having a longitudinal direction corresponding to the longitudinal direction of the wearer and a lateral direction perpendicular to the longitudinal direction,
The top sheet is a sheet having a concavo-convex structure having a plurality of skin-side protrusions protruding toward the skin facing surface and having an internal space, and a plurality of non-skin-side protrusions protruding toward the non-skin facing surface and having an internal space. The skin-side protruding portion has a wall portion of an annular structure between the top portion and the opening portion of the internal space,
The wall portion of the skin-side protruding portion has a fiber basis weight higher than the fiber basis weight of the top portion of the skin-side protruding portion,
The absorbent body is formed from a laminate of absorbent sheets, and has a plurality of slits in the excretory part facing part,
The slit penetrates at least one layer on the top sheet side in the laminate,
In the excretion part facing part, a hollow part having a hollow structure between the skin-side protruding part and the absorber, and a non-crimped part where the non-skin-side protruding part and the absorber are not crimped And an absorbent article. On the skin facing surface of the absorbent main body, a linear squeezing groove is formed in which the top sheet and the absorbent body are integrally recessed toward the back sheet side,
In the said excretion part opposing part, the absorbent article of Claim 1 by which the said surface sheet and the said absorber are not crimped | bonded in parts other than the said linear pressing groove. When the top sheet is viewed in plan, the skin-side protrusions and the non-skin-side protrusions are alternately and continuously arranged along two different directions intersecting each other,
Each of the slits is a vertical slit extending in the vertical direction, and is distributed in both the vertical direction and the horizontal direction,
The absorbent article of Claim 1 or 2 which has the said slit by which the top part of each of the said two skin side protrusion parts is distribute | arranged on one said vertical slit. The slit passes through all the layers of the laminate,
The absorbent article according to any one of claims 1 to 3, wherein the slit has an opening area on the top sheet side smaller than an opening area on the back sheet side.

Images