JP6692633B2 - Absorbent article - Google Patents

Description

  The present invention relates to absorbent articles such as sanitary napkins, incontinence pads, and diapers.

  In absorbent articles such as sanitary napkins, the material and structure of each member have been improved to improve the function and wearing feeling. Surface sheets and absorbers as members have also been developed with such improvements in mind.

For example, Patent Document 1 describes that the squeezing groove for integrally squeezing the surface sheet and the absorber is formed in a meandering shape in order to prevent deformation of the napkin, twisting, etc., and side leakage of liquid. ..
Further, Patent Document 2 describes a structure in which embossments are arranged on both sides of the absorbent body along the longitudinal direction in order to suppress twisting and lateral leakage of the absorbent body in the napkin. The embossing has a pattern in which a plurality of linear portions and arcuate portions are alternately arranged.

International Publication No. 2004/078085 JP, 2014-147446, A

  On the other hand, from the viewpoint of improving the feeling of wearing, it has been required to further improve the softness and dry feeling of the surface sheet that comes into contact with the skin. On the other hand, it has been attempted to make the surface sheet uneven and bulky to further improve the touch, breathability and liquid permeability.

However, because of the softness, the bulky uneven portion of the surface sheet as described above is likely to be crushed at a portion adjacent to the above-described squeeze groove or the like as the leak-proof groove. When the surface sheet has a hollow portion, it tends to be easily crushed. With this, when the surface sheet is incorporated into an absorbent article, the original function of the bulky surface sheet may be impaired and may not be sufficiently exhibited.
As described above, the squeeze groove as the leakproof groove is very useful from the viewpoint of preventing twisting and lateral leakage of liquid, but it is difficult to be compatible with a bulky surface sheet having irregularities. This problem is not described in Patent Documents 1 and 2 above.

  Therefore, the present invention maintains the bulkiness due to the unevenness of the surface sheet in the vicinity of the leak-proof groove (squeezed groove), and has an excellent prevention performance against twisting and lateral leakage due to the leak-proof groove, and a soft touch property due to the surface sheet. The present invention relates to an absorbent article that has both a dry feeling and an excellent wearing feeling.

  The present invention has a surface sheet on the skin contact surface side, a back sheet on the non-skin contact surface side, and an absorber positioned between the top sheet and the back sheet, and the abdomen of the wearer. An absorbent article having a longitudinal direction extending from the crotch portion to the back side and a width direction orthogonal to the longitudinal direction, wherein the topsheet has skin side surfaces and absorbent body side surfaces with embossed portions. There is no uneven surface and a hollow portion, the leak-proof groove partially recessed from the surface sheet to the absorber, at least a pair of left and right on the surface sheet, the leak-proof groove, A structure having a consolidating portion where the topsheet and the absorber are depressed in an integrally consolidated state, wherein the pair of left and right leak-proof grooves are waves extending in the longitudinal direction in plan view of the topsheet. It has a shape and has a widthwise center line extending in the longitudinal direction as an axis. Shape to provide an absorbent article is symmetrical Te.

  The absorbent article of the present invention maintains the bulkiness due to the unevenness of the surface sheet in the vicinity of the leak-proof groove, has an excellent prevention performance against twisting and lateral leakage due to the leak-proof groove, and has a soft touch and a dry feeling due to the surface sheet. It is possible to achieve both excellent wear feeling and the like.

It is a partially cutaway perspective view which shows typically the sanitary napkin as one preferable embodiment of the absorbent article in this invention from the skin contact surface side in the extended state. It is a partially notched perspective view which shows typically the preferable aspect of the surface sheet in the sanitary napkin of this embodiment. It is a partially cutaway perspective view which shows typically the other preferable aspect of the surface sheet in the sanitary napkin of this embodiment. (A) is a top view which shows typically the preferable aspect of the corrugated shape of the compression groove as a leak-proof groove in this embodiment, (B) shows the outside curved part of the compression groove shown in (A) partially. It is a top view which expands and shows. (A) And (B) is explanatory drawing which shows typically the pattern which squeezes the protrusion part of a surface sheet by the squeeze groove as a leak-proof groove | channel of this embodiment, (C) is a conventional linear shape. It is explanatory drawing which shows typically the pattern which squeezes the protrusion part of a surface sheet with a compression groove. 4A is a cross-sectional view schematically showing a cross section taken along the line RA-RA of FIG. 4A, and FIG. 4B is a cross-sectional view schematically showing a cross section taken along the line RB-RB of FIG. 4A. FIG. 6A is a plan view showing an arrangement relationship between an array of pocket portions included in the arch-shaped leakproof groove shown in FIG. 5 and a liquid receiving region, and FIG. 7B is a pocket portion included in the linear leakproof groove. FIG. 5 is a plan view showing the arrangement relationship between the arrangement of FIG. (A) is a top view which shows typically the other preferable aspect of the corrugated shape of the compression groove as a leak-proof groove | channel in this embodiment, (B) shows the outer curved part of the compression groove shown in (A) partly. It is a top view which expands and shows. 8A is a cross-sectional view schematically showing the RC-RC line cross section of FIG. 8A, and FIG. 8B is a cross-sectional view schematically showing the RD-RD line cross section of FIG. 4A. It is a top view which shows typically also the aspect which the curvature of the groove edge of the width direction inner side (liquid receiving area | region side) and the width direction outer side (outer edge side) differ in the pressing groove shown in FIG. It is explanatory drawing which shows typically the relationship of the wave height of the wave shape of the squeeze groove as a leak-proof groove, and the uneven | corrugated pitch of a surface sheet, (A) shows the surface sheet of FIG. 2, and the squeeze groove of FIG. 2 shows a combination, (B) shows a combination of the top sheet of FIG. 2 and the pressing groove of FIG. 4, and (C) shows a combination of the top sheet of FIG. 3 and the pressing groove of FIG. (D) shows a combination of the topsheet of FIG. 3 and the pressing groove of FIG. It is the top view which showed typically the preferable aspect of the compression groove which consists of a combination of a high pressure part and a low pressure part, (A) has shown the case of the compression groove of FIG. 4, (B) and (C). 8) shows the case of the compressed groove of FIG. 8, and (D) and (E) show the case of the compressed groove of FIG. 10. (A) is an explanatory view showing the influence of tension when the high-pressure squeezing section is surrounded by the low-pressure squeezing section, and (B) shows the tension when the high-squeezing section is not surrounded by the low-pressure squeezing section. It is explanatory drawing shown about a ripple. It is explanatory drawing which shows typically the arrangement | positioning in case several compression grooves as a leak-proof groove are distribute | arranged. (A) And (B) is explanatory drawing which shows typically the deformation | transformation when the external force from the width direction is applied in the case of the arrangement configuration of the compression groove of FIG. 14, (C) and (D), It is explanatory drawing which shows typically the deformation | transformation when the external force from the width direction is applied in the arrangement configuration of the compression groove of FIG. FIG. 15 is a plan view schematically showing two pairs of non-squeezed regions that are arranged apart from each other in the excretion part corresponding region of FIG. 14. (A) is a drawing substitute photograph which imaged the cross section near the pressing groove in the sample of Example 1, (B) is a drawing substitute photograph which imaged the cross section near the pressing groove in the sample of Comparative Example 1, (C) ) Is a representative photograph of a drawing obtained by taking a state of injecting 6 g of the leakage prevention test on the sample of Example 1 from the top sheet, and (D) is the same as Example 1 for the sample of Comparative Example 1. It is a drawing representative photograph which imaged the injected state from the surface sheet.

First, a sanitary napkin (hereinafter also referred to as a napkin) 10 as a preferred embodiment of the absorbent article according to the present invention will be described with reference to the drawings.
The napkin 10 shown in FIG. 1 has a surface sheet 1 on the skin contact surface side, a back sheet 2 on the non-skin contact surface side, and an absorber 3 located between the top sheet 1 and the back sheet 2. In the present embodiment, side sheets 4 are further laminated on both sides of the surface sheet 1 on the skin contact surface side. The side sheet 4 and the back sheet 2 extend outward in the width direction of the absorbent body 3 to form a wing portion 5 that is a fixing means for fixing the napkin 10 to underwear or the like. In the laminated structure of this sheet, the outer peripheral edge of the napkin 10 is an outer peripheral seal portion 9 joined without the absorber 3 interposed.

The topsheet 1 has a bulky structure in which a skin side surface and an absorbent body side surface (non-skin contact surface side) are provided with an uneven surface without an embossed portion and a hollow portion. The embossed portion here is a portion provided on the surface sheet, which has a higher density than the surroundings and where the fibers are fused to each other, and the portion is not formed in the absorber. .. Therefore, in other words, the embossed portion is a densified fusion portion which is provided on the surface sheet and does not reach the absorber. Therefore, the squeezing section 6 described later is distinguished from the embossing section referred to here. An example of a surface sheet having a bulky structure including an uneven surface without an embossed portion and a hollow portion is described in JP 2013-133574 A, for example. As a result, the topsheet 1 is a portion that directly touches the wearer's skin, has a soft touch, good breathability, quick liquid permeability, and is unlikely to leave a liquid residue.
On the surface sheet 1, a pair of left and right squeezing grooves 6 as leak-proof grooves, which are partially recessed from the surface sheet 1 to the absorber 3, are arranged at least in the width direction. The pair of left and right squeezing grooves 6, 6 have a corrugated shape that extends in the longitudinal direction (Y direction) in a plan view of the topsheet 1. The corrugations are bilaterally symmetrical with respect to the widthwise center line L extending in the longitudinal direction of the napkin 10. As a result, the napkin 10 has a wide area in which the bulky structure of the topsheet 1 is sufficiently maintained in the portion other than the pressing groove 6 including the periphery of the pressing groove 6.
Details of the bulky structure of the surface sheet 1 and the wave shape of the compressed groove 6 will be described later.

  The napkin 10 has a vertically long shape having a longitudinal direction (Y direction) and a width direction (X direction) orthogonal to the longitudinal direction. The longitudinal direction is a direction in which the wearer's skin side portion and back side portion are connected via the crotch part when the napkin 10 is attached. That is, when the napkin 10 is worn, the topsheet 1 side is directed toward the wearer's skin side, the longitudinal direction is arranged from the wearer's lower abdomen through the crotch part to the back side, and the width direction is left and right. It is worn by arranging it in the direction of connecting the legs of the. At that time, the wing portions 5 and 5 are bent and wound around the crotch portion of the underwear, and the napkin 10 is fixed by an adhesive portion (not shown) of the wing portion 5.

  The napkin 10 has an excretion part corresponding region C arranged corresponding to the excretion point of the wearer. Further, it can be classified as a front part F arranged in the lower abdomen in front of the excretion part corresponding region C and a rear part R arranged in the rear buttocks side. Further, in the widthwise direction of the excretion part corresponding region C, a region that directly receives the excreted liquid, which is inside the squeezing grooves 6 and 6 described later, is called a liquid receiving region C1. In the present embodiment, these three areas are areas obtained by dividing the napkin 10 into three equal parts in the longitudinal direction, and the area having the wing portions is the excretion portion corresponding area. This division can be set according to the size of the absorbent article that changes depending on the purpose of use and the like. For example, when a napkin for daytime is formed symmetrically in the front-rear direction, for example, the central portion when the napkin is divided into three in the vertical direction is the excretion part corresponding region. Since a night napkin or the like has a wide rear flap that covers the buttocks at the rear, the excretory region corresponds to the center of the front side when the napkin is bisected in the longitudinal direction. Further, in the case where a wing that is bent and fixed to the crotch part of the shorts is provided regardless of whether it is for daytime or nighttime, the region where the wing exists becomes the excretion part corresponding region. On the other hand, when the wing portion is not provided, the excretion portion corresponding region is generally a central region when the napkin 10 is divided into three in the longitudinal direction Y.

  In the present invention, unless otherwise specified, the side in contact with the human body is referred to as the skin side or the skin contact surface side or the front surface side, and the opposite side is the non-skin surface side or the non-skin contact surface side or the back surface side. That. The front side of the human body when worn will be referred to as the front, the end thereof will be referred to as the front end, and the rear side will be referred to as the rear, and the end thereof will be referred to as the rear end. Further, the normal direction of the front surface or the back surface of the absorbent article is called the thickness direction, and the amount thereof is called the thickness.

  Next, the surface sheet 1 will be described.

The topsheet 1 has an uneven surface 11 without an embossed portion on each of the skin side surface Z1 and the absorber side surface (non-skin side surface) Z2 (the skin side surface Z1 has an uneven surface 11A and the absorber side surface Z2 has an uneven surface 11). It may be referred to as the uneven surface 11B.). In addition, the uneven surface 11 means a portion excluding a portion directly compressed by a compression groove described later. In the present embodiment, the uneven surface 11 is arranged in the entire area of the topsheet 1 other than the pressing groove 6.
The topsheet 1 has a thickness due to the uneven surfaces 11 on both sides, and has a hollow portion in the thickness portion. The uneven surface and the hollow portion make the topsheet 1 bulky and soft to the touch, and have excellent breathability. In addition, since the uneven surface does not have an embossed portion, it does not have a hardened portion, is smoothly deformed by body pressure, and has excellent conformability to skin and fit. The surface sheet 1 is preferably an air-through nonwoven fabric formed by an air-through method. Moreover, it is preferable that the topsheet 1 be made of one non-woven fabric from the viewpoint of softness.

  A specific example of the topsheet 1 will be described with reference to FIGS. 2 and 3. However, the topsheet 1 is not limited to the configurations shown in FIGS. 2 and 3, and may have various configurations as long as it is a bulky one having hollow portions on both sides of which are uneven surfaces without embossing.

The topsheet 1A shown in FIG. 2 has a first projecting portion 21 on the skin side surface Z1 and a second projecting portion 22 on the absorbent body side surface Z2 that projects in a direction opposite to the first projecting portion 21. A plurality of first projecting portions 21 and second projecting portions 22 are alternately arranged in different directions intersecting in plan view. The different directions are, for example, the longitudinal direction (Y direction) and the width direction (X direction) of the napkin 10. However, different intersecting directions are not limited to the orthogonal X direction and Y direction, and include different directions intersecting at various angles. A plurality of these alternating arrangements are arranged in the seat plane direction. In this plurality of arrays, the arrangement of the first projecting portions 21 and the second projecting portions 22 is a staggered arrangement in which the first projecting portions 21 and the second projecting portions 22 are staggered by a half pitch between the arrays that run side by side. It is preferable from the viewpoint of making the pressure load as uniform as possible and improving the shape retention.
The first protrusion 21 has a hollow portion 21K, and the second protrusion 22 has a hollow portion 22K. The hollow portion 21K of the first projecting portion 21 is an internal space opened on the absorber side surface Z2, and forms a recess on the absorber side surface Z2 (hereinafter, also referred to as absorber-side recess 21K). The hollow portion 22K of the second protrusion 22 is an internal space opened on the skin side surface Z1 and forms a recess on the skin side surface Z1 (hereinafter, also referred to as skin side recess 22K). As a result, the skin side surface Z1 of the topsheet 1 has the uneven surface 11A in which the first protrusions 21 and the skin side recesses 22K are alternately arranged in a plurality of different directions that intersect in a plan view. In addition, the absorbent body side surface Z2 of the first nonwoven fabric sheet has the uneven surface 11B in which the second protruding portions 22 and the absorbent body side recessed portions 21K are alternately arranged in plural in different directions intersecting in plan view.

  The topsheet 1A has a structure in which the first protruding portion 21 and the second protruding portion 22 are continuous in the plane direction without an embossed portion, except for a pressing groove 6 described later. Further, the topsheet 1A of the present embodiment does not have a bent portion, and is entirely formed by a continuous curved surface. The term "continuous" as used herein means that there are no broken portions of fibers or through holes. This through hole does not mean a fine hole such as a gap between fibers, but a portion where fibers are cut off. For example, a hole having a circle equivalent diameter of 1 mm or more can be defined as a through hole. The topsheet 1 does not have such through holes.

  In the present embodiment, the first projecting portion 21 and the second projecting portion 22 have a truncated cone shape with a rounded top or a hemispherical shape. That is, each of the first protruding portion 21 and the second protruding portion 22 has an independent dome-shaped protruding shape, not a streak shape. The first projecting portion 21 and the second projecting portion 22 are not limited to the above shapes, and may have any shape as long as they have independent projecting shapes. For example, various pyramid shapes (cones in the present specification It is practical that the shape widely includes a cone, a truncated cone, a pyramid, a truncated pyramid, an oblique cone, and the like.). In the present embodiment, the internal spaces 21K and 22K of the first projecting portion 21 and the second projecting portion 22 are frustoconical or hemispherical spaces having a rounded top similar to the outer diameter of each projecting portion.

  In the skin side surface Z1 and the absorber side surface Z2 of the topsheet 1A, the opening portions of the hollow portions 21K and the hollow portions 22K connect the first protruding portions 21 and 21 with each other and the second protruding portions 22 and 22 with the ridge portion 23. It is a separated and independent space. In the sheet thickness direction of the topsheet 1, the first projecting portion 21 and the second projecting portion 22 are continuous via the wall portion 24, and the wall portion 24 partitions the internal spaces 21K and 22K. The wall portion 24 has a shape in which a ring is formed in the plane direction so as to surround the internal space, and the ring is continuous in the sheet thickness direction. The “ring” here is not particularly limited as long as it has an endless series of shapes in plan view, and may be any shape such as circle, ellipse, rectangle, polygon in plan view. A circle or an ellipse is preferable for maintaining the continuous state of the sheet. The topsheet 1 of FIG. 2 has a sheet structure in which both projecting portions are continuous via a wall portion 24 and a ridge portion 23.

  Further, the wall portion 24 has a fiber orientation along the standing direction at any point along the ring. In other words, the wall portion 24 has a radial fiber orientation that converges toward the apex 22T of the second protrusion 22 in relation to the second protrusion 22. Specifically, it is the fiber orientation described in paragraphs [0014] to [0020] of JP 2012-136790 A.

  In the sheet thickness of the top sheet 1A when viewed as a whole, the first protrusion 21, the wall 24, and the second protrusion 22 are typically defined as parts divided into three equal parts. These thicknesses are naturally determined by the sheet thickness (P1 = P2 = P3). However, when the kurtosis or the curvature of the tops of the first protrusion 21 and the second protrusion 22 is different, a relatively narrow portion which is linear in cross section is defined as the wall portion 24, which is curved and rounded. The regions may be the first protrusion 21 and the second protrusion 22, respectively. In the latter definition, for example, when the first protrusion 21 has a gentle curved surface with a smaller curvature (larger radius of curvature) than the second protrusion 22, the second protrusion 22 has the first protrusion. The sheet is divided into sheets longer than the sheet thickness direction of 1, and has a deviation in the thickness direction as a whole.

The topsheet 1A has excellent cushioning properties.
The topsheet 1A has a three-dimensional cushioning property of being in contact with other members, skin, etc. in a small area on both sides and well following the three-dimensional movements of the members and skin, and being deformed flexibly. .. In addition, by having the hollow portions 21K and 22K, the surface sheet 1A has a soft cushioning feeling when touched by the skin. In addition, the interposition of the wall portion 24 enables the first projecting portion 21 and the second projecting portion 22 to be deformed independently with respect to stress without interfering with each other, and has a three-dimensional cushioning property. Further, the annular wall portion 24 connects the first protruding portion 21 and the second protruding portion 22 to disperse the stress applied to one protruding portion in an annular shape, and reduce the ripple to the other protruding portion. Thereby, it has a cushioning property that the entire topsheet 1A is not completely crushed. Further, due to this stress distribution, the shape retention of the entire topsheet 1A is high, and the shape restoring force is large even when crushed. Further, in the wall portion 24, as described above, by having the fiber orientation along the standing direction at any point of the ring, a firm stiffness is produced and the above cushioning property is enhanced.
As a result, the topsheet 1A is unlikely to lose its initial cushioning property even when the napkin 10 is packed or worn continuously.

The topsheet 1A has a high liquid permeability, does not easily retain a liquid, and has excellent air permeability.
The topsheet 1A has a bulkiness that separates the skin and the absorbent body by the protrusions on both sides, and has excellent liquid permeability due to the hollow portions 21K and 22K on both sides, and it is difficult for the liquid to remain. At the same time, it is difficult for the permeated liquid to return to the skin side. Further, due to the structure in which both surfaces are in contact with each other in a small area and the hollow portions 21K and 22K, the contact area with the skin is suppressed and the breathability is excellent. As a result, even after excretion of urine, feces, menstrual blood and vaginal discharge, a wide range of response and a very good dry feeling are maintained.
Particularly, in the plurality of independent hollow portions 21K and 22K, the excreted liquid can be dispersed and collected and quickly separated from the skin. Thereby, the liquid can be quickly delivered to the absorber 3 without causing the liquid to stay on the surface of the topsheet 1A. Specifically, when the excrement has high viscosity such as menstrual blood or loose stool and low permeability, it is once dispersed and collected in the skin-side concave portion (hollow portion of the second protruding portion) 22K of the skin side surface Z1. The contact with the skin can be effectively suppressed. Further, the liquid once collected is taken into the internal space 21K of the first projecting portion 21 from the wall portion 24 and collected. Further, when the excrement is clay having a low viscosity and high permeability such as urine, the excrement is directly permeated from the first protruding portion 21 and is recessed on the absorbent body side Z2 (the hollow of the first protruding portion 21). Part) 21K. As a result, excrement dispersion collection in the laminated non-woven fabric 10 is promoted and efficiently delivered to the absorbent body 3 and has high liquid permeability.

  The topsheet 1 may be a topsheet 1B as shown in FIG. 3, for example, in addition to the topsheet 1A described above.

In the surface sheet 1B shown in FIG. 3, the third protruding portion 25 on the skin side surface Z1 and the fourth protruding portion 26 on the absorber side surface Z2 have a streak-like protruding shape extending in the longitudinal direction (Y direction). .. The third projecting portions 25 and the fourth projecting portions 26 project in mutually opposite directions, are alternately arranged in the width direction (X direction), and have a corrugated shape like galvanized iron.
The third protruding portion 25 has a hollow portion 25K, and the fourth protruding portion 26 has a hollow portion 26K. The hollow portion 25K of the third projecting portion 25 is an internal space opened on the absorber side surface Z2, and forms a streak-like recess on the absorber side surface Z2 (hereinafter, also referred to as absorber-side recess 25K). The hollow portion 64K of the fourth projecting portion 26 is an internal space opened on the skin side surface Z1 and forms a streak-shaped recess on the skin side surface Z1 (hereinafter, also referred to as skin side recess 26K). As a result, the skin side surface Z1 of the topsheet 1B has the uneven surface 11A in which the third protrusions 25 extending in the longitudinal direction and the skin side recesses 26K are alternately arranged in the width direction. Further, the absorbent body side surface Z2 of the first nonwoven fabric sheet has the uneven surface 11B in which the fourth protruding portions 26 extending in the longitudinal direction and the absorbent body side recessed portions 25K are alternately arranged in the width direction.
This surface sheet 1B is also formed by a continuous curved surface without bent portions, with the third protruding portions 25 and the fourth protruding portions 26 continuously alternating without an embossed portion, except for a pressing groove 6 described later. Has been done. As a result, the topsheet 1B has a bulkiness that separates the skin from the absorber, and has excellent cushioning properties. In addition, the bulkiness and the liquid permeability of the hollow portion make it difficult for the liquid to remain and prevent the liquid from returning. In addition, the breathability is excellent and the dry feeling when worn is likely to last.

The napkin 10 includes the topsheet 1 as described above, and has at least a pair of left and right squeezing grooves 6 that are partially recessed from the topsheet 1 to the absorber 3.
The compression groove 6 is a portion where the constituent fibers of the member are pressure-bonded and compressed by compression. The crimping prevents the liquid from moving in the width direction. Further, due to the consolidation, the capillary force is higher than the other portions, and the force for drawing the liquid into the thickness direction acts strongly. With these, the squeeze groove 6 has a blocking function against liquid transfer.

  Next, the compressed groove 6 as the leak-proof groove will be described below. In the present specification, the compressed groove is a groove formed by integrally compressing the topsheet 1 and the absorber 3. In other words, the leak-proof groove has a structure in which the surface sheet and the absorber have a consolidated portion which is recessed in a consolidated state, and the consolidated portion has a groove shape having a bottom portion. The groove has left and right side wall portions and a bottom portion. At the bottom portions of the compressed grooves 6 and 6, as compared with the peripheral portion of the compressed groove, that is, a portion where the compressed groove is not formed, the topsheet 1 and the absorber 3 are provided. The density of each is higher. Therefore, the compressed groove is a groove in which the density of at least the bottom is higher than that of the peripheral portion. In addition, in the present specification, the “consolidated portion” is a recessed portion having a higher density than its surroundings, and as in the present embodiment, typically, a pressure is applied to a member to increase the density. Is created by the method.

  The compression groove 6 has a wavy shape extending in the longitudinal direction in a plan view. That is, it has a shape in which the outer edge is linearly extended while undulating while having a predetermined width in a plan view. The wave shape is symmetrical with respect to the widthwise centerline L extending in the longitudinal direction as an axis. In the present embodiment, the squeezing grooves 6 are arranged to extend in the longitudinal direction at the left and right sides of the excretion part corresponding region C. However, the arrangement of the squeezing grooves 6 is not necessarily limited to the excretion portion corresponding region C, and may extend from the excretion portion corresponding region C to the front portion F and the rear portion R.

  Further, in the present embodiment, the squeezing grooves 6 and 6 each have one large gentle arch (bow) shape in which the entire shape extending by connecting the waves is curved outward in the width direction of the napkin 10. This arch shape enhances the tension relieving action due to the wave shape described later, and also acts as the napkin 10 as a whole so as to absorb and relieve the pressure in the width direction during mounting. As a result, it is preferable that the member configuration of the liquid receiving region C1 is prevented from being twisted, and the bulky structure of the both-sided uneven surface of the surface sheet having the hollow portion can be easily maintained even at the time of mounting.

  A specific example of such a pressing groove 6 will be described below with reference to FIGS. However, the squeezing groove 6 is not limited to these forms, and may take various forms as long as it has a corrugated shape that can maintain the bulky structure of the topsheet 1.

First, FIG. 4 (A) shows a compressed groove 6A as an example.
The squeezing groove 6 of FIG. 4 (A) has a constant groove width and meanders. That is, the squeezing groove 6A makes the predetermined width t between the inner groove edge 61 on the inner side (the liquid receiving area side) of the napkin 10 in the width direction and the outer groove edge 62 on the outer side (outer edge side) of the napkin 10 in the width direction constant. While keeping, it has a curved shape that meanders on the extension line of the groove. As a result, continuous crushing of the protruding portion of the topsheet 1 due to the linear compression groove 99 as shown in FIG. 5C is avoided at the edge of the extension line of the compression groove 6A. As a result, a region where the protruding portion of the topsheet 1 remains is created around the squeezed groove 6A or at the edge. For example, in the surface sheet 1A, the first protruding portion 21 and the second protruding portion 22 are discontinuously present in the periphery along the wave of the pressing groove 6A (see FIG. 5 (A)). In the topsheet 1B, the streak-shaped third projecting portions 23 and the fourth projecting portions 24 are only partially squeezed by the waves of the squeezing grooves 6A and continue to exist (see FIG. 5B). As a result, the bulkiness of the surface sheet 1 due to the uneven surface on both sides relaxes the hardness around the squeezing groove 6A, and also imparts softness to the outer edge portion of the napkin 10, resulting in a good wearing feeling. In addition, in FIGS. 5A to 5C, a shaded portion indicates a portion where the protruding portion is crushed.

In addition, inside the outer curved portion 63 swinging outward in the width direction of the compressed groove 6A (on the liquid receiving region C1 side), there is the pocket portion 12 of the topsheet 1 surrounded by the compressed groove 6A (see FIG. 4 (B)). ). In the pocket portion 12, there is a bulky structure of the surface sheet 1 having a hollow portion on both sides of the uneven surface (see FIG. 6A). Therefore, the above-mentioned liquid permeability of the topsheet 1 is exhibited even though it is near the outer peripheral edge of the napkin 10 in the width direction. This liquid permeability suppresses the amount of liquid that diffuses and assists the liquid blocking function of the compression groove 6A. Further, in the outer curved portion 63, the capillary force described above as a part of the compressed groove 6A works strongly. Since the outer curved portion 63 surrounds the pocket 12, the liquid is drawn in by the squeeze groove itself, and acts in such a direction as to enclose the liquid in the pocket 12 and temporarily hold the liquid to promote liquid permeation through the surface sheet. The pocket portion 12 is effective in suppressing the lateral leakage of liquid due to the interaction between the surface sheet 1 and the outer curved portion 63 of the compression groove 6A. Furthermore, since the hollow portion of the topsheet 1 is present in the pocket portion 12, the texture is good and the liquid does not easily return from the absorber. Further, in this pocket portion 12, since an appropriate distance to the compression groove 6A can be maintained, the liquid dropped from the projecting portion is less likely to exceed the compression groove 6A, and this is also effective in suppressing lateral leakage of the liquid.
Further, since the entire compression groove 6A has the above-described arch shape, there are more pockets 12 than the linear compression groove, and there are pockets surrounding the liquid receiving area (FIG. 7 (A), (See (B)). As a result, the arch-shaped compression groove 6A is more effective in suppressing lateral leakage than the linear compression groove. More specifically, the arch-shaped compression groove 6A of FIG. 7 (A) has a distance between the pocket portion 12 and the liquid receiving region C1 in the longitudinal direction as compared with the linear compression groove of FIG. 7 (B). It does not separate from the center to the front and back, and maintains a relatively constant distance. As a result, the plurality of pockets 12 of the squeezing groove 6A can receive the liquid diffusing in all directions from the liquid receiving region C1 so as to surround it, which is very useful for preventing the liquid from leaking from the lateral direction. is there.

In addition, since the corrugated compression grooves 6A, 6A are symmetrically arranged, the outer curved portions 63 that are swung outward are arranged to face each other, as shown in FIG. 4 (A). As a result, the distance W1 between the outer curved portions 63, 63 (the distance between the inner groove edges 61, 61) becomes wider than between the normal linear compression grooves, and the tension on the surface sheet 1 therebetween is reduced. .. As a result, in the widthwise region extending from the periphery of the outer curved portions 63, 63 to the liquid receiving region C1, crushing of the hollow portion of the topsheet 1 is suppressed, and the internal space is likely to remain. The bulkiness of the surface sheet 1 due to the unevenness on both sides is maintained, and the above-mentioned high cushioning property, soft touch due to it, and excellent liquid permeability and air permeability are sufficiently exhibited. In addition, as described above, the fact that the squeeze grooves 6A, 6A each have one large gentle arch shape curved outward in the widthwise direction also acts in the direction of weakening the tension, and the above-mentioned action of the surface sheet 1 Contribute to.
Further, as shown in FIG. 4A, the inner curved portions 64 swung inward in the width direction are also arranged to face each other. The distance W2 between the inner curved portions 64, 64 is shorter than the distance W1 between the outer curved portions 63, 63, and the tension F relative to the topsheet 1 is relatively strong (see FIG. 6 (B)). .. As a result, between the inner curved portions 64, 64, the liquid drawing force in the thickness direction of the compressed groove 6A is strong.
In this way, between the pair of corrugated compression grooves 6A, 6A, portions having a strong tension on the surface sheet 1 and portions having a weak tension are alternately provided along the longitudinal direction of the napkin 10. As a result, the cushioning property and liquid permeability due to the bulkiness of the topsheet 1 and the liquid blocking function due to the compression groove 6A act in a well-balanced manner.

  In addition, the same action occurs on the outer side in the width direction of the compressed groove 6A, further relaxing the hardness felt in the crotch and giving a good dry feeling without liquid remaining. On the outside of the inner curved portion 64, as shown in FIG. 6 (B), there is a bulky structure of the uneven surface of the topsheet 1, cushioning properties and soft touch are generated, and high liquid permeability and good dry feeling can be obtained. .. On the outside of the outer curved portion 63, the distance from the outer peripheral seal portion 9 is shorter than that of the inner curved portion 64, and the liquid blocking function works by the tension of the compression groove 6A. Therefore, along the width direction of the napkin 10, different actions are exerted on the inner side in the width direction of the compressed groove 6A (the liquid receiving region C1 side of the napkin 10) and the outer side in the width direction (the outer edge side of the napkin 10). As a result, the cushioning property and liquid permeability due to the bulkiness of the topsheet 1 and the liquid blocking function by the squeezing groove 6A function more well in the entire napkin 10.

  Further, the corrugated pressing groove 6A includes the outer curved portion 63 and the inner curved portion 64, and does not include a straight portion. That is, it has a curved shape without a bent portion. As a result, liquid is less likely to collect at the corners that bend, resulting in an excellent dry feel. In addition, even when an external force is applied during mounting, there is no angular deformation at the bent portion, resulting in soft and flexible deformation, and soft touch is maintained. It also makes it easier to fit the skin.

  The corrugated shape of the squeezing groove 6 may be a meandering shape shown in FIG. 4 (A) or a shape having a constriction in the width direction as shown in FIG. 8 (A).

  The squeezing groove 6B in FIG. 8A has a width between the inner groove edge 61 on the inner side (liquid receiving area side) of the napkin 10 and the outer groove edge 62 on the outer side (outer edge side) in the width direction of the napkin 10. It is not constant and has a plurality of maximum widths tm and minimum widths ts alternately. The wavy shape of the compressed groove 6 is a shape in which the inner groove edge 61 and the outer groove edge 62 are gently connected by a curve between the maximum width tm and the minimum width ts. The part having the minimum width ts is the constricted part 65. On the other hand, the portion having the maximum width tx is referred to as the widened portion 66. The width of the groove gradually changes between the narrowed portion 65 and the widened portion 66, and the compressed groove 6B has the corrugated shape. Therefore, also in this case, the curved portion has no curved portion and does not have a linear portion.

In the squeezing groove 6B of FIG. 8A, there is a bulky structure of both sides of the constricted portion 65 (the liquid receiving area side and the outer edge side) of the surface sheet 1 having both-sided concave and convex surfaces (see FIG. 9 ( See A)). Further, since the constricted portion 65 itself also has the minimum width ts, the rigidity is not higher than that of the other portions of the compressed groove 6B. With such a configuration, the softness around the constricted portion 65 becomes even higher than that of the compressed groove 6A described above. On the other hand, the widened portion 66 has the highest liquid blocking function with the maximum width tm. In addition, inside the narrowed portion 65 of the compressed groove 6B in the width direction, there is the pocket portion 12 as in the compressed groove 6A (see FIG. 8B). The pocket portion 12 causes the liquid to be enclosed by the interaction between the bulky surface sheet 1 and the corrugated pressing groove 6B, and is effective in suppressing the lateral leakage of the liquid.
Furthermore, the wavy shape of the compressed groove 6B is symmetrical with respect to the widthwise center line L extending in the longitudinal direction as an axis. As a result, between the compression grooves 6B, 6B, as in the case of the compression portion 6A, along the longitudinal direction of the napkin 10, a portion where a strong tension FT acts on the surface sheet and a portion where a weak tension FS acts are alternated. (See FIGS. 8A, 9A and 9B). Further, the strength of the tension is the same in the widthwise outer side of each of the compressed grooves 6B and 6B as in the widthwise inner side. As a result, the cushioning property and liquid permeability due to the bulkiness of the topsheet 1 and the liquid blocking function due to the pressing groove 6B act in a well-balanced manner. In addition, as described above, the fact that the squeeze grooves 6B, 6B each have one large gradual arch shape curved outward in the width direction also acts in the direction of weakening the tension, and the above-mentioned action of the topsheet 1 Contribute to.

In the squeezing groove 6B, it is preferable that the height of the wave at the portion protruding in the width direction of the corrugation be as follows in order to make the lateral leakage suppression of the liquid as well as the softness. That is, the height of the wave in the portion of the corrugated shape protruding in the width direction is different between the width direction inner side and the width direction outer side of the napkin 10, and the wave height on the width direction inner side (inner groove edge 61 side) is the width direction outer side. It is preferable that the height of the wave on the (outer groove edge 62 side) is larger (see FIG. 10).
As a result, the liquid blocking function can be concentrated and enhanced on the liquid receiving region side, and the rigidity of the portion of the napkin 10 near the crotch on the outer side in the width direction can be relaxed. Further, by increasing the height of the wave on the inner side in the width direction of the widened portion 66, the inner groove edge 61 connecting the narrowed portion 65 and the widened portion 66 can be made long, which is effective in preventing leakage. In addition, this increases the aforementioned pocket portion, which enables temporary holding by enclosing the liquid, which is effective in suppressing lateral leakage.

The wave height of the compressed groove 6 is the wave height of the portion of the edge of the compressed groove 6 projecting in the width direction in a plan view. The height of the wave on the liquid receiving area side, which is the inner side in the width direction, is the length in the width direction between the apex 61T of the widened portion 66 and the bottom portion 61B of the constricted portion 65 at the inner groove edge 61 (wave height difference). M1 (hereinafter referred to as wave height M1). In addition, the height of the wave on the outer edge side, which is the outer side in the width direction, is the length in the width direction between the top portion 62T of the widening portion 66 and the bottom portion 62B of the constricted portion 65 at the outer groove edge 62 (wave height difference). M2 (hereinafter referred to as wave height M2).
It is preferable that the height M1 of the wave on the liquid receiving area side is larger than the height M2 of the wave on the outer edge side from the viewpoint of the above operation. In this magnitude relationship, the difference in wave height (M1-M2) varies depending on the size of the article and cannot be unconditionally determined, but in the case of a sanitary napkin, for example, 0.5 mm or more is preferable. 0 mm or more is more preferable. Further, the height (M1-M2) of the wave is preferably 9.0 mm or less, and more preferably 5.0 mm or less. Specifically, the difference in wave height (M1-M2) is preferably 0.5 mm or more and 9.0 mm or less, and more preferably 1.0 mm or more and 5.0 mm or less. It is preferable that such a magnitude relationship is established at the same position in the longitudinal direction.

Further, in any form of the pressing groove 6, it is preferable to have the following configuration from the viewpoint of more reliably maintaining the bulky structure of the double-sided uneven surface having the hollow portion of the topsheet 1. That is, as shown in FIG. 11, it is preferable that the wave height M1 of the portion of the pressing groove 6 protruding in the width direction is smaller than the pitch M3 of the unevenness in the width direction of the topsheet 1. As a result, the area where the pressing groove 6 and the protruding portion of the topsheet 1 overlap becomes small, and the uneven surface of the topsheet 1 is less likely to collapse around the pressing groove 6, which is preferable.
The wave height of the compression groove 6 here is the wave height of the portion protruding in the width direction defined above. Typically, this is the height difference of the waves at the inner groove edge 61. For example, in the compressed groove 6B, as described above, the length in the width direction between the apex 61T of the inner groove edge 61 of the widened portion 66 and the bottom point 61B of the inner groove edge 61 of the constricted portion 65 (wave height difference). ) Means M1. In addition, in the compressed groove 6A, the length in the width direction between the apex 61T closest to the liquid receiving area side of the inner groove edge 61 on the meandering line and the bottom point 61B farthest from the liquid receiving area side (wave Height difference).
In addition, the unevenness pitch M3 in the width direction of the topsheet 1 is the length between the protrusions in the width direction when the protrusion and the recess are a set of repeating units on the skin contact surface side of the topsheet 1. Means

The ratio (M1 / M3) of the wave height (M1) of the compression groove 6 to the pitch (M3) of the unevenness of the surface sheet 1 is preferably 0.9 or less from the viewpoint of retaining the unevenness of the surface sheet 1, 0.8 or less is more preferable, and 0.7 or less is further preferable. Further, the ratio (M1 / M3) is preferably 0.1 or more, more preferably 0.2 or more, still more preferably 0.3 or more, from the viewpoint of maintaining the hollow structure in the pocket portion. More specifically, the ratio (M1 / M2) is preferably 0.1 or more and 0.9 or less, more preferably 0.3 or more and 0.8 or less, and further preferably 0.5 or more and 0.7 or less.
The wave height (M1) of the squeezing groove 6 varies depending on the size and application of the absorbent article to be applied, but in the case of a sanitary napkin, for example, it is preferably 1 mm or more from the viewpoint of preventing leakage of menstrual blood. It is more preferably at least 0.5 mm and even more preferably at least 2 mm. Further, the height (M1) of the wave is preferably 10 mm or less, more preferably 8 mm or less, and further preferably 6 mm or less from the viewpoint of suppressing the area of the squeezed groove portion where rigidity becomes high and eliminating discomfort in mounting.
The pitch (M2) of the unevenness of the topsheet 1 varies depending on the size and use of the absorbent article to be applied, but in the case of a sanitary napkin, for example, the bulky structure of the topsheet is maintained and cushioning at the time of wearing is improved. From the viewpoint of making it possible, 2 mm or more is preferable, 2.5 mm or more is more preferable, and 3 mm or more is further preferable. In addition, the pitch (M2) is preferably 12 mm or less, more preferably 10 mm or less, and further preferably 8 mm or less, from the viewpoint of maintaining the smooth feel of the surface sheet.

  In addition, in any of the squeezing grooves 6, it is preferable that the squeezing grooves 6 do not have the same squeezing depth in the thickness direction of the napkin 10 but are a combination of a high-squeezing portion 67 and a low-squeezing portion 68 having different depths. .. The high-pressure pressing portion 67 is a portion where the depth of the groove is deeper than that of the low-pressure pressing portion 68, and the density of the groove bottom is higher than the density of the groove bottom of the low-pressure pressing portion 68. In the low-pressure pressing portion 68, the tension on the topsheet 1 is relaxed more than in the high-pressure pressing portion 67, and the bulky structure of the double-sided concave-convex surface having the hollow portion of the topsheet 1 is less likely to be crushed. In addition, this makes it possible to further enhance the soft touch and excellent flexibility of the napkin 10 due to the corrugated pressing portion 6.

As a specific aspect, the arrangements shown in FIGS. 12A to 12E can be mentioned. FIG. 12A shows the pressing groove 6A composed of the high-pressure pressing portion 67 and the low-pressure pressing portion 68, and FIGS. 12B to 12E show the pressing groove 6B in the high-pressure pressing portion 67 and the low-pressure pressing portion 68. It is configured with. FIG. 1 (A) shows a mode in which the high-pressure pressing portion 67 is located in a portion swung inward and outward in the width direction of the pressing groove 6A. 12B to 12E, the high-pressure pressing portion 67 is in the widening portion 66 (FIGS. 12B and 12D), and the high-pressure pressing portion 67 is in the constricted portion 65 (FIG. 12 (C)). ) And (E)) are shown. Either aspect may be used. However, from the viewpoint of creating the softness of the topsheet 1 by the constricted portion 65 and sharing the function of blocking the liquid by the widening portion 66, it is more preferable that the high-pressure pressing portion 67 is in the widening portion 66.
Further, in any of the aspects, the high-pressure pressing portion 67 is more preferably arranged so as to be surrounded by the low-pressure pressing portion 68 from the viewpoint of achieving both a stepwise and reliable blocking function against liquid transfer and further softness. preferable. That is, it is preferable that the front, rear, left, and right outer peripheries of the high-pressure pressing portion 67 are surrounded by the low-pressure pressing portion 68. In this case, the wavy shape of the compressed groove 6 (6A, 6B), that is, the corrugated waves of the inner groove edge 61 and the outer groove edge 62, is formed by the low pressure compressed portion 68. As a result, the tension of the high-pressure pressing portion 67 is less likely to be transmitted to the outside of the groove edge of the pressing groove 6 by the intervention of the low-pressure pressing portion 68 having a lower tension. As a result, the relaxation of tension due to the above-mentioned corrugated shape and the symmetrical arrangement is further enhanced, and the bulky structure of the surface sheet is more easily maintained. In addition to the above-described liquid permeability due to the bulky structure of the surface sheet 1, a low pressure squeezing portion 68, a high pressure squeezing portion 67 and a stepwise protective wall are provided in the liquid transfer direction. That is, in cooperation with the action of the surface sheet 1, the liquid transfer can be effectively blocked by the two-stage prepuring of the pressure bonding and the two-stage prepending of the capillary force due to the gradient of the fiber density.

The operation of forming the compression groove 6 with the high-pressure pressing portion 67 and the low-pressure pressing portion 68 will be described with reference to FIGS. 13 (A) and 13 (B).
FIG. 13A shows a state in which the high-pressure pressing portion 67 is surrounded by the low-pressure pressing portion 68 in the width direction of the napkin 10. That is, the low-pressure pressing portion 68 is adjacent to the outer periphery of the high-pressure pressing portion 67 and forms the inner groove edge 61 on the inner side in the width direction of the pressing groove 6 (not shown, the low-pressure pressing portion 68 corresponds to the high-pressure pressing portion 67). It is also arranged on the outer side in the width direction and forms the outer groove edge 62.). On the other hand, in FIG. 13B, the compression groove 6 up to the inner groove edge 61 is formed only by the high-pressure compression portion 67 in the width direction of the napkin 10. In both figures, the high-pressure pressing unit 67 compresses the topsheet 1 and the absorber 3 to reduce the thickness H1 of the napkin 10 to the thickness H2 and press-bond it. On the other hand, in the low pressure pressing portion 68, as shown in FIG. 13 (A), the topsheet 1 and the absorber 3 are pressed more weakly than the high pressure pressing portion 67, and the thickness H1 of the napkin 10 is kept to the thickness H3. Therefore, the thickness H2 of the high-pressure pressing portion 67 is smaller than the thickness H3 of the low-pressure pressing portion. At this time, at the bottom portion 67T of the high-pressure pressing portion 67, a tension F1 that pulls in the non-pressed portion of the topsheet 1 acts by pressure bonding. In the low-pressure pressing section 68, a tension F2 weaker than the tension F1 works.
In the mode of FIG. 13B in which the low-pressure pressing portion 68 is not provided, the tension F1 of the bottom portion 67T directly acts on the topsheet 1 of the peripheral portion W which is not pressed. On the other hand, in the mode of FIG. 13 (A) surrounded by the low pressure squeezing portion 68, the spread of the tension F1 of the bottom portion 67T is prevented by the crimping portion of the low pressure squeezing portion 68 at the bottom portion 68T. Therefore, the tension F2 of the bottom portion 68T of the low pressure pressing portion 68, which is weaker than the tension F1, acts on the surface sheet 1 of the peripheral portion W that is not compressed. As a result, the influence of the tension of the compression groove 6 on the topsheet 1 is further weakened. This further assists in the relaxation of the tension due to the squeezing groove 6 having the corrugated shape and left-right symmetry, and the bulky structure of the topsheet 1 is more easily maintained. Further, the wavy shape of the compression groove 6 also reduces the tension on the portion of the projecting portion of the topsheet 1 that avoids direct compression. Therefore, the surface sheet 1 adjacent to the pressing groove 6 is softer, has excellent breathability, and maintains high liquid permeability.

Further, the napkin 10 may have a plurality of pairs of the pair of left and right pressing grooves 6 described above. In this case, it is preferable that the pair of squeezing grooves 6 having the widest separation area between the squeezing grooves adjacent to each other in the width direction be in the liquid receiving area C1 of the excretion portion corresponding area C.
An example shown in FIG. 14 is a specific example of the plurality of pairs. In FIG. 14, a pair of compression grooves 6Q and 6Q and a pair of compression grooves 6R and 6R are arranged at the front portion F and the rear portion R of the pair of compression grooves 6P and 6P, respectively. Further, a pair of compression grooves 6S, 6S is arranged at spaced apart positions on the outer sides in the width direction of the compression grooves 6P, 6P.
The squeezing portion 6P has one large gradual arch shape in which the entire shape extended by connecting the waves is curved so as to surround the outer edge in the width direction of the liquid receiving region C1 of the excretion portion corresponding region C. The pressing groove 6Q draws one arc that connects waves with a shorter length than the pressing groove 6P and curves outward in the width direction, and is connected to the other pressing groove 6Q on the front end side of the napkin 10 to form an arc shape. Is becoming Similarly, the pressing groove 6R also connects the waves with a shorter length than the pressing groove 6P to draw one arc curved outward in the width direction, and is connected to the other pressing groove 6R to form an arc shape. The compression grooves 6S are arranged in pairs outside the compression grooves 6P in the width direction. More specifically, the pressing groove 6S draws one arc that connects the waves and curves outward in the width direction so as to surround the outer edge side of the pressing groove 6P with a shorter length than the pressing groove 6P. Each squeeze groove is paired symmetrically with each other.
Further, between the compressed grooves 6P and the compressed grooves 6S, there are non-compressed regions 8 on both sides of the napkin 10. The compression grooves 6P and the compression grooves 6S are symmetrical on the left and right sides of the napkin 10, respectively. Therefore, a plurality of pockets 12S drawn by the waves of each other are arranged between the compressed portions 6P and 6S.
Furthermore, the compression groove 6Q and the compression groove 6R are connected to the front and rear ends of the compression groove 6P, and there are connection portions 69 at four front, rear, left, and right positions. Each of the connecting portions 69 has a shape that is recessed inward in the width direction, because the arches of the squeezing portions are formed at the portions that are inward in the width direction.

  In the structure having a plurality of pairs of compressed grooves, the area of tension relaxation due to the corrugation increases, and the bulky structure of the topsheet 1 is maintained in a wide range. In addition, it is possible to further enhance the pressure absorption and relaxation by the compression groove 6 with respect to the external force in the width direction when the napkin 10 is attached. As a result, twisting of the member configuration of the liquid receiving region C1 is suppressed, and the bulky structure of the surface sheet with the both-sided concave-convex surface including the hollow portion is more easily maintained even when the napkin 10 is used, which is preferable. In addition, the liquid absorbency at the outer peripheral edge of the napkin 10 is further improved. As a result, even if the napkin 10 is worn in various situations (for example, a walking posture, a momentary change in posture during work, or a situation in which a sitting posture is maintained for a long time), side leakage of liquid may occur. It is preferable because it can be prevented and the absorption can be realized firmly.

  For example, in the case of the embodiment of FIG. 14, as shown in FIGS. 15A and 15B, when the external force F9 from the crotch is applied, the compression groove 6P receives the external force F9. At this time, the compression groove 6P is connected to the front and rear compression grooves 6Q and 6R by the connecting portion 69 to form a breakwater extending in the longitudinal direction of the napkin. Therefore, the external pressure F9 applied to the compression groove 6P is weakened inward of the liquid receiving region C1 with the rigidity of the front and rear compression grooves 6Q and 6R. In addition, since the connecting portion 69 has a shape that is recessed inward, the external force F9 is less likely to be associated with deformation of the front and rear compression grooves 6Q and 6R and the periphery thereof. This is preferable because the twist in the liquid receiving area C1 and the bulky structure of the topsheet 1 associated therewith are easily maintained even when mounted, and proper liquid absorption is realized. Although not shown, the squeeze groove 6S serves as a first breakwater against external pressure, which is preferable because it can further prevent external force from spreading to the inside of the liquid receiving area C1. On the other hand, in the case of a pair of compression grooves as shown in FIGS. 15C and 15D, the spread of the external force F9 acts more strongly on the liquid receiving region C1 than in the above case depending on the strength of the force. There is a case. From this, it is more preferable to have a plurality of pairs of compressed grooves from the viewpoint of maintaining the performance during use.

  Further, as shown in FIG. 16, the non-squeezed region 8 between the squeezing grooves 6P and the squeezing grooves 6S has pocket portions 12S which are undulated with each other. In the pocket portion 12S, the bulky structure of the topsheet 1 remains. As a result, quick liquid permeation also acts on this portion, which functions as a further breakwater against liquid leakage, which is preferable. Further, the pocket portion 12S between the compression groove 6P and the compression groove 6S is preferable because the portion that touches the crotch area becomes softer to the touch.

  In the case of the compression groove 6 in which the high-pressure pressing portion 67 and the low-pressure pressing portion 68 are combined, the planar shape of the high-pressure pressing portion 67 may be any form. In the case of the wavy shape of the compressed groove 6B, it is preferable that the front and rear ends of the planar shape of the high-pressure compressed portion 67 are tapered in relation to the constricted portion 65. For example, a circle, an ellipse, a rhombus, etc. are mentioned.

  The method for forming the compressed groove 6 as described above can be carried out by adopting an ordinary method used for articles of this type. For example, a method of heat-sealing using a pressing roll (not shown) whose surface is uneven and has a pressing portion can be used. The shape (height, width, uneven shape, etc.) of the pressing portion can be appropriately set from the viewpoint of pressing strength and the like. Further, the pressing strength, the pressing depth can be adjusted by appropriately setting the processing conditions such as the pressing pressure, the heating temperature (heat sealing temperature) and the pressing time.

In the napkin 10, for the bulky structure of the topsheet 1 described above, various shaping methods for a nonwoven fabric can be appropriately adopted.
For example, in the case of the surface sheet 1A shown in FIG. 2, in the air-through method, the fiber web is placed on a shaped support having an uneven surface, and the temperature and velocity of the hot air to be blown are controlled to perform the shaping treatment and the heat treatment. It can be obtained by performing a fusion treatment. For example, the method described in paragraph [0031] of JP2012-136790A or the method described in paragraphs [0033] to [0061] of JP2012-149371A can be used. Further, examples of the shaped support used in that case include the support shown in FIG. 1 of JP 2012-149370 A, the support shown in FIGS. 1, 3 and 4 of JP 2012-149371 A, and the like. ..
In the case of the topsheet 1B shown in FIG. 3, the intersections of the constituent fibers of the fibrous web are heat-sealed to make a nonwoven fabric, and then the sheet is carried into a pair of concavo-convex (tooth groove) rolls that mesh with each other and stretched in one direction. You can get it.

  As the forming material of the topsheet 1, the backsheet 2, the absorber 3 and the sidesheet 4 constituting the napkin 10, those used in this type of article can be used without particular limitation.

  For example, the surface sheet 1 may be made of a non-woven fabric, and as a forming material thereof, for example, a hydrophilically treated thermoplastic resin fiber such as the fiber material described in paragraph [0032] of JP2012-136791A can be used. .. Further, a liquid permeable sheet such as an apertured film may be combined with the non-woven fabric. The above-mentioned forming material may be obtained by hydrophilizing a fiber having a three-dimensional crimp such as a secondary crimp or a tertiary crimp. Specifically, polyethylene, polypropylene, polyester, nylon, and composite fibers thereof are prepared, and various hydrophilic agents are applied at a stage before forming staples by cutting them into a predetermined length. Examples of the hydrophilizing agent include various alkyl sulfonates represented by α-olefin sulfonates, acrylates, acrylate / acrylamide copolymers, ester amides, ester amide salts, polyethylene glycol and derivatives thereof, water-soluble agents. Hydrophilic treatment with various commonly used hydrophilizing agents such as a water-soluble polyester resin, various silicone derivatives, various saccharide derivatives, and mixtures thereof can be used.

As the back sheet 2, a moisture-impermeable or moisture-permeable film alone, or a laminated film and a nonwoven fabric, or a water-repellent nonwoven fabric (SMS, SMMS, etc.) can be used. It is most preferable to use the moisture permeable film alone as the leak preventer in terms of cost and matching with the displacement preventing adhesive. As the moisture-permeable film material in this case, a thermoplastic resin, a film extruded by melt-kneading an inorganic filler that is not compatible with it and extruding the film to a predetermined dimension to form micropores, or essentially A non-porous film having a high water compatibility and capable of discharging water vapor like an osmotic membrane is mentioned. In order to realize a leak-proof layer that sufficiently exhibits the performance of humidity discharge according to the present invention and does not exude moisture, the water vapor permeability is 0.7 g / 100 cm ² hr or more and 3.0 g / 100 cm ² hr or less. Is preferably in the range of 1.0 g / 100 cm ² hr or more and 2.5 g / 100 cm ² hr or less. From the viewpoint of sufficiently enhancing the feeling of dryness, it is most preferably 1.5 g / 100 cm ² hr or more and 2.5 g / 100 cm ² hr or less. In addition, the film basis weight is 18 g / m ² or more and 70 g / m ² or less, and more preferably 25 g / m ² or more and 60 g / m ² or less so that the film can be used without troubles such as tearing. Further, the preferable amount of the inorganic filler compounded is 30% by mass or more and 65% by mass or less, more preferably 40% by mass or more and 60% by mass or less as the mass% of the filler with respect to the mass of the entire film.

  The constituent material of the absorbent body 3 is not particularly limited, but a material such as a fibrous material, a mixed laminated fiber material of a fibrous material and a porous material sandwiched between core wrap sheets (paper, non-woven fabric, etc.), etc. may be used. it can. As the fiber material, for example, natural fibers such as wood pulp, cotton and hemp, polyophylene resin such as polyethylene and polypropylene, polyester resin such as polyethylene terephthalate, single fiber composed of synthetic resin such as polyvinyl alcohol resin, these resins It is possible to use a composite fiber containing two or more of the above, and a semi-synthetic fiber such as acetate or rayon. When a fiber made of synthetic fiber is used, the fiber may be a heat shrinkable fiber whose shape is changed by heat. For example, the fineness is increased by heat but the fiber length is shortened, or the fineness is hardly changed by heat, but the length occupied by apparent fibers is shortened by changing the shape into a coil. Good. As the porous body, a sponge, a non-woven fabric, an aggregate of a super absorbent polymer (an aggregate of super absorbent polymer and fibers), or the like can be used.

  The side sheet 4 is preferably a water-repellent non-woven fabric, and is made of a non-woven fabric manufactured by the card method, a spun bond non-woven fabric, a melt blown non-woven fabric, a spunlace non-woven fabric, a heat roll non-woven fabric, a needle-punched non-woven fabric, or the like. Various water-treated nonwoven fabrics can be used. Particularly preferably, for example, a spunbond nonwoven fabric, a spunbond-meltblown (SM) nonwoven fabric, a spunbond-meltblown-spunbond (SMS) nonwoven fabric, or the like is used.

  The absorbent article of the present invention is not limited to the sanitary napkin of the above embodiment, and can be applied to, for example, an incontinence pad, an incontinence liner, a urine absorbing pad, a disposable diaper and the like. Further, it is effective not only for menstrual blood but also for urine, shavings, loose stools and the like. In addition to the above-mentioned constituent members, appropriate members may be incorporated according to the use and function.

  Regarding the above-described embodiment, the present invention further discloses the following absorbent articles.

<1>
A skin-contacting surface-side surface sheet, a non-skin-contacting surface-side backsheet, and an absorber located between the topsheet and the backsheet, and from the wearer's abdomen to the crotch part. An absorbent article having a longitudinal direction across the back side through and a width direction orthogonal to the longitudinal direction,
The surface sheet has a concavo-convex surface without an embossed portion and a hollow portion on the skin side surface and the absorbent body side surface, and the leak-proof groove partially recessed from the surface sheet to the absorbent body is the surface sheet. There are at least one pair on the left and right,
The leak-proof groove is a structure having a consolidated portion in which the topsheet and the absorber are recessed in an integrated consolidated state,
The pair of left and right leak-proof grooves each have a corrugated shape extending in the longitudinal direction in a plan view of the surface sheet, and are bilaterally symmetric with respect to a widthwise center line extending in the longitudinal direction as an axis. Absorbent article.

<2>
The said leak-proof groove | channel is an absorbent article as described in said <1> whose width | variety between the groove edge inside a width direction and the groove edge outside a width direction is constant.
<3>
The said leak-proof groove is an absorbent article as described in said <1> which has the width direction constriction.
<4>
The wave height of the portion of the leak-proof groove protruding in the width direction is different between the width direction inner side and the width direction outer side of the absorbent article, and the wave height on the width direction inner side is the width direction. The absorbent article according to any one of <1> to <3> above, which is higher than the height of the outer wave.
<5>
The absorbent article according to any one of the above items <1> to <4>, wherein a height of a wave in a portion of the leakproof groove protruding in the width direction is smaller than a pitch of unevenness in the width direction of the surface sheet.
<6>
The ratio M1 / M3 of the wave height M1 of the leak-proof groove to the pitch M3 of the unevenness of the surface sheet is 0.1 or more and 0.9 or less, preferably 0.3 or more and 0.8 or less, more preferably 0. The absorbent article according to <5>, which is 5 or more and 0.7 or less.
<7>
Any one of the above items <1> to <6>, in which the wave height of the portion protruding in the width direction of the leak-proof groove is 1 mm or more and 10 mm or less, preferably 3 mm or more and 8 mm or less, and more preferably 5 mm or more and 6 mm or less. The absorbent article according to 1.
<8>
The said leak-proof groove is comprised by the high-pressure pressing part and the low-pressure pressing part, The said high-pressure pressing part is an absorbent article any one of said <1>-<7> arrange | positioned mutually mutually.
<9>
The absorbent article according to <8>, wherein the high-pressure pressing portion is surrounded by the low-pressure pressing portion.
<10>
A plurality of the pair of left and right leakproof grooves are arranged, and a pair of leakproof grooves having a widest separation area between the leakproof grooves adjacent to each other in the width direction are in the liquid receiving area. > The absorbent article according to any one of <1>.
<11>
The absorbent article according to <3>, wherein the leak-proof groove has a widened portion continuous with the constricted portion.
<12>
The absorbent article according to <11>, wherein the leak-proof groove includes a high-pressure pressed portion and a low-pressure pressed portion, and the high-pressure pressed portion is in the widened portion.
<13>
The absorbent article according to <11>, wherein the opening groove includes a high-pressure pressed portion and a low-pressure pressed portion, and the high-pressure pressed portion is in the constricted portion.
<14>
The absorbent article according to any one of the above items <1> to <13>, wherein the uneven surface of the topsheet does not have a bent portion and is entirely formed by a continuous curved surface.
<15>
The surface sheet has a first protrusion that protrudes to the skin side and a second protrusion that protrudes to the absorber side, and the plurality of <1> to <1> are arranged alternately in different directions intersecting in plan view. The absorbent article according to any one of <14>.
<16>
The absorbent article according to <15>, wherein, in the surface sheet, the first protrusions and the second protrusions are arranged in a zigzag arrangement in which the first protrusions and the second protrusions are alternately arranged in a staggered arrangement in a mutually adjacent arrangement.
<17>
The absorbent article <18> according to <15> or <16>, wherein the first protrusion and the second protrusion are cone-shaped.
The absorbent article according to <15> or <16>, wherein the first protrusion and the second protrusion have a truncated cone shape with a rounded top or a hemispherical shape.
<19>
The absorbent article according to any one of <1> to <14>, in which the surface sheet has corrugated shapes in which streaky irregularities are alternately arranged in the width direction.
<20>
The absorbent article according to any one of <1> to <19>, which has a plurality of pairs of left and right leak-proof grooves.
<21>
In the excretion part corresponding region of the absorbent article, which faces the excrement part of the wearer, a leak-proof groove which makes a pair sandwiching the liquid receiving region and a leak-proof groove which makes a pair on the outer side in the width direction are arranged. The absorbent article according to <20>.
<22>
The leak-proof groove according to any one of <1> to <19>, wherein the overall shape is one large gentle arch shape curved outward in the width direction of the absorbent article. Absorbent article.
<23>
The absorbent article according to any one of <1> to <22>, wherein the absorbent article is a sanitary napkin.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited thereto.

(Example 1)
First, the nonwoven fabric shown in FIG. 2 was produced and cut into a size for a surface sheet. Specifically, a sheet manufactured by the method described in JP2013-133574A was used. The top sheet has a basis weight of 12 g / m ^{2 at} 2.4 dtex in which the core is polyethylene terephthalate and a sheath is made of polyethylene, and a bottom sheet is 2.9 dtex fiber in which the core is made of polyethylene terephthalate and the sheath is made of polyethylene and is 18 g / m ² . The total weight of the topsheet was adjusted to 2.2 mm by adjusting the total weight of the topsheet to 30 g / m ² so that the basis weight was obtained. In the top sheet, the distance between the tops of the skin-side protrusions adjacent in the width direction (X direction) is 5 mm, and the distance between the tops of the skin-side protrusions adjacent in the longitudinal direction (Y direction) is 8 mm. It was
The obtained topsheet was an absorber (a pulp having a basis weight of 280 gsm and 0.1 g of a superabsorbent polymer sprinkled thereon and wrapped in tissue paper), a back sheet (a polyethylene film having a basis weight of 23 gsm), and a side sheet (a basis weight). An amount of 20 gsm of spunbonded non-woven fabric was laminated and fixed. Then, a pair of bilaterally symmetrical pressing grooves shown in FIG. 4 was formed. The wavy shape of the compressed groove was the pattern of FIG. The height of the waves at this time was 3 mm. The photograph as a substitute for a drawing in FIG. 17 (A) shows the cross section of the outer curved portion 63 of the corrugated compression groove 6A and a part (pocket portion 12) on the liquid receiving area side of the obtained sample. On the substitute photograph of FIG. 17 (A), a one-dot chain line is attached to help grasp the curved state of the outer curved portion 63. The one-dot chain line indicates the curved portion of the bottom edge of the compressed groove 6A. That is, the outer curved portion 63 is curved to the right, and the left side of the outer curved portion 63 is the pocket 12 of the topsheet 1. As shown in the imaged photograph of FIG. 17 (A), the pocket portion 12 was the edge of the compressed groove 6A, and the hollow portion 21K remained firmly on the surface sheet 1, and there was a bulky structure with unevenness on both sides.

(Comparative Example 1)
The same topsheet, absorber, backsheet and sidesheets as in Example 1 were used for stacking and fixing to form linear squeezing grooves having no corrugation. As can be seen from FIG. 17 (B), in the surface sheet at the edge of the compressed groove, the hollow portion was crushed, and the unevenness was crushed more than in Example 1.

(Test method)
1. Liquid residue test of surface sheet around squeezed groove 2.0 g of defibrinated horse blood was poured into a sanitary napkin for each evaluation along the squeezed groove in a range of 35 mm in a non-pressurized state. Sixty seconds after the defibrinated horse blood was poured, the L value was measured in a range of a diameter of 8 mm centered on the feeding position of the defibrinated horse blood. A simple spectral color difference meter NF333 manufactured by Nippon Denshoku Industries Co., Ltd. was used for the measurement.
The larger the L value (brightness), the closer the color is to white, and the less redness is visible on the surface sheet. That is, the larger the L value, the smaller the liquid remaining on the topsheet.
The defibrinated horse blood used had its viscosity adjusted to 8.0 ± 0.1 cP (25 ° C.). The viscosity was adjusted by adding plasma and blood cell components extracted from horse blood itself to horse blood. The plasma and blood cell components are the supernatant portion and the precipitation portion, respectively, when horse blood is left to separate.

2. Test of leak prevention by squeezing groove The sanitary napkin for each evaluation was spread in a plane, and the surface sheet was faced upward and fixed on a smooth inclined surface having an inclination angle of 45 ° with respect to the horizontal plane without pressure. Defibrinated horse blood similar to that described above was injected at a rate of 1 g / 10 seconds from the squeezed groove (the squeezed groove adjacent to the liquid receiving area) on the surface sheet to a position 10 mm away from the liquid receiving area. The injection amount (limit injection amount) at the time when the defibrinated horse blood got over the compression groove was measured. The larger the measured injection amount, the higher the leak prevention performance by the pressing groove.
Note that the drawing-substituting photographs in FIGS. 17C and 17D are images of the state around the squeezing groove and the injection point at the time of total injection of 6 g while the injection is continued.

  As shown in the above Table 1, in Example 1, the L value was improved by about 13% as compared with Comparative Example 1, and the liquid permeability of the surface sheet and the liquid remaining prevention property therewith in the vicinity of the compressed groove were improved. Was excellent. Further, in Example 1, the limit injection amount was improved by about 50% as compared with Comparative Example 1, and the liquid permeability of the surface sheet at the edge of the compressed groove was extremely excellent. As can be seen from the comparison between FIGS. 17 (A) and 17 (B), the surface sheet of Example 1 had larger hollow portions around the compressed grooves than the surface sheet of Comparative Example 1 and had unevenness. It is likely that this was due to the presence of a raised and distinct bulky structure. That is, due to the corrugated shape of the compressed groove, the bulky structure of the surface sheet around the compressed groove continues, and more liquid is guided to the absorber by the liquid permeability due to the bulky structure, and the liquid defense function of the compressed groove is achieved. It seems to have been supplemented. In addition, the topsheet of Example 1 had a softer feel to the skin than that of Comparative Example 1 due to the above-mentioned bulky structure.

1, 1A, 1B Topsheet 21 First protrusion 22 Second protrusion 25 Third protrusion 26 Fourth protrusion 2 Backsheet 3 Absorber 6, 6A, 6B Compressed groove (leak-proof groove)
61 Groove edge on the liquid receiving area side (inner groove edge)
62 outer edge groove edge (outer groove edge)
63 Outer curved portion 64 Inner curved portion 65 Constricted portion 66 Widened portion 67 High pressure squeezing portion 68 Low pressure squeezing portion 69 Connecting portion 10 Sanitary napkin

Claims (6)

A skin-contacting surface-side surface sheet, a non-skin-contacting surface-side backsheet, and an absorber located between the topsheet and the backsheet, and from the wearer's abdomen to the crotch part. An absorbent article having a longitudinal direction across the back side through and a width direction orthogonal to the longitudinal direction,
The surface sheet has a concavo-convex surface without an embossed portion and a hollow portion on the skin side surface and the absorbent body side surface, and the leak-proof groove partially recessed from the surface sheet to the absorbent body is the surface sheet. There are at least one pair on the left and right,
The leak-proof groove is a structure having a consolidated portion in which the topsheet and the absorber are recessed in an integrated consolidated state,
The pair of left and right leak-proof grooves each have a wavy shape extending in the longitudinal direction in a plan view of the surface sheet, and are bilaterally symmetric with respect to a widthwise center line extending in the longitudinal direction as an axis. ,
The corrugated shape of the leak-proof groove is a position on the left and right sides of the excretion portion corresponding region corresponding to the excretion point of the wearer, and each of the inner groove edge and the outer groove edge is a shape in which a plurality of waves are connected, The absorbent article in which the height of the wave in the portion protruding in the width direction in a plan view is smaller than the uneven pitch in the width direction of the topsheet .   The absorbent article according to claim 1, wherein the leak-proof groove has a constriction in the width direction.   The wave height of the portion of the leak-proof groove protruding in the width direction is different between the width direction inner side and the width direction outer side of the absorbent article, and the wave height on the width direction inner side is the width direction. Absorbent article according to claim 1 or 2, which is higher than the height of the outer waves. The anti Momizo comprises at a high compression portion and a low compression portion, the absorbent article according to any one of claims 1 to 3, wherein said high-compression portions are disposed apart from each other. The absorbent article according to claim 4, wherein the high-pressure pressed portion is surrounded by the low-pressure pressed portion. The pair of left and right and anti Momizo is arranged plurality widest pair of anti Momizo is spaced region between the anti Momizo adjacent in the width direction is in the liquid-receiving region, one of the claims 1-5 The absorbent article according to item 1.