Absorbent article

Abstract

To provide an absorbent article capable of grasping an excretion state without using visual recognition.SOLUTION: An absorbent article has a vertical direction, a horizontal direction and a thickness direction, and is divided into an abdominal side area, a crotch area, and a back side area. The absorbent article is provided with an absorber including an absorbent member and back sheet having moisture permeability. The absorbent member has: a pair of deformation guide parts in a crotch area; a central area located between the pair of deformation guide parts; and a side area located outside in the horizontal direction of the central area. The central area has a skin side layer located on a skin side and a non-skin side layer located on the non-skin side. The absorbent member contains a high-water-absorption polymer, and in the central area, more high-water-absorption polymer are unevenly present in the non-skin side layer than in the skin side layer. The central area has: a first area where only the non-skin side layer exists; and a second area where the non-skin side layer and the skin side layer exist in the thickness direction. The absorbent member has a space formed in the first area by the skin side layer not existing. The high-water-absorption polymer included in the non-skin side layer existing in the first area is not adhered to other members when absorbing water.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to absorbent articles such as disposable diapers. [Background technology]

[0002] Some disposable diapers are equipped with an indicator that notifies the wearer of urination, for example (see Patent Document 1). The indicator changes color when the wearer urinates, and a caregiver who helps the wearer put on the diaper can confirm that the wearer has urinate by the color of the indicator. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-255559 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the diaper is covered by clothing, it is necessary to remove the clothing and then visually check the change in color of the indicator to understand the excretion status. In addition, it may be difficult to check the color of the indicator in a dark place. In addition, if the caregiver is visually impaired, such as weak eyesight or color vision deficiency, it may be difficult to understand the excretion status by visually checking the indicator.

[0005] The present invention relates to an absorbent article that allows the state of excretion to be confirmed without visual inspection. [Means for solving the problem]

[0006] An absorbent article according to one embodiment of the present invention has a vertical direction extending from the wearer's abdominal side through the crotch region to the back side, a horizontal direction perpendicular to the vertical direction and corresponding to the wearer's left-right direction, and a thickness direction perpendicular to the vertical direction and the horizontal direction, and is divided into a abdominal region arranged on the abdominal side, a crotch region arranged in the crotch region, and a back region arranged in the back portion. The absorbent article includes an absorbent body and a back sheet. The absorbent body is disposed across the abdominal region and the dorsal region and includes an absorbent member. The back sheet is disposed on the non-skin side of the absorbent body and has moisture permeability. The absorbent member has a pair of deformation guides each extending in the vertical direction in the crotch region and disposed on either side of the center in the horizontal direction. The absorbent member has a central region located between the pair of deformation guides, and side regions located laterally outward of the central region. The central region of the absorbent member has a skin side layer positioned on the skin side and a non-skin side layer positioned on the non-skin side. The absorbent member contains a superabsorbent polymer, and in the central region, the superabsorbent polymer is unevenly distributed in a greater amount in the non-skin side layer than in the skin side layer. The central region has a first region where only the non-skin side layer is present, and a second region where the non-skin side layer and the skin side layer are present in the thickness direction. The absorbent member has a space in the first region formed by the absence of the skin side layer. The highly absorbent polymer contained in the non-skin side layer present in the first region does not adhere to other members when it absorbs water. Effect of the Invention

[0007] According to the absorbent article of the present invention, the excretory state can be grasped without visual confirmation. [Brief description of the drawings]

[0008] [Figure 1]FIG. 1 is a schematic perspective view showing an example of a disposable diaper according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a plan view of a disposable diaper according to the first embodiment, showing the disposable diaper unfolded and spread out flat with the elastic members of each part stretched, as viewed from the skin side (surface material side). [Diagram 3] FIG. 3 is a schematic cross-sectional view of the disposable diaper according to the first embodiment taken along line III-III in FIG. 2. [Figure 4] FIG. 1 is a plan view showing an example of an absorbent core constituting a part of a disposable diaper according to a first embodiment. [Diagram 5] FIG. 1 is a schematic cross-sectional view showing an example of a disposable diaper according to a first embodiment when worn. [Figure 6] 2 is a graph showing an example of the pore size distribution of the back sheet, in which the horizontal axis represents pore size (μm) and the vertical axis represents pore volume (ml / g). [Figure 7] FIG. 2 is a plan view showing a schematic structure of a moisture-permeable film constituting a back sheet. [Figure 8] FIG. 4 is a schematic cross-sectional view of a disposable diaper according to a second embodiment when worn. [Figure 9] FIG. 11 is a schematic cross-sectional view of a disposable diaper according to a third embodiment when worn. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following embodiment, an example in which an absorbent article according to the present invention is configured as a pants-type disposable diaper will be given.

[0010] First Embodiment [Overall composition of disposable diapers] 1 to 5 show a pants-type disposable diaper 1 as an absorbent article according to a first embodiment of the present invention. The pants-type disposable diaper 1 will be referred to as diaper 1 hereinafter. The diaper 1 has a longitudinal direction X, a transverse direction Y, and a thickness direction Z. The longitudinal direction X extends from the wearer's abdomen through the crotch area to the back. The transverse direction Y is perpendicular to the longitudinal direction X and corresponds to the left-right direction of the wearer. The thickness direction Z is perpendicular to the longitudinal direction X and the transverse direction Y of the diaper 1. In this specification, with respect to the lateral direction Y, the side closer to the vertical center line CL that divides the diaper 1 in half in the lateral direction Y is referred to as the "inner side in the lateral direction Y," and the side away from the vertical center line CL is referred to as the "outer side in the lateral direction Y." In this specification, when each component is viewed from the thickness direction Z, it is referred to as a plan view. In this specification, the skin side of each component refers to the side that is located on the skin side of the wearer when the disposable diaper is worn. In each component, the non-skin side refers to the side that is located opposite to the skin side of the wearer when the disposable diaper is worn. In addition, with regard to the thickness direction Z, the side that is closer to the wearer's skin when worn may be referred to as the top, and the side that is closer to the clothing may be referred to as the bottom.

[0011] As shown in Figs. 1 and 2, the diaper 1 has a waist opening 1W and a pair of leg openings IL, and is placed around the waist and crotch area of ​​a wearer when worn. The diaper 1 is divided into a ventral region A, which is arranged on the ventral side of the wearer when worn, a dorsal region B, which is arranged on the dorsal side of the wearer when worn, and a crotch region C, which is located between the ventral region A and the dorsal region B and is arranged in the crotch area of ​​the wearer when worn. The ventral region A, the crotch region C, and the dorsal region B are arranged along the longitudinal direction X. The ventral region A and the dorsal region B are joined at their side edges A1, B1 in the lateral direction Y to form a waist opening 1W. Leg openings are formed in the crotch region C, which form leg openings 1L. 2 shows the diaper 1 unfolded and laid out flat to the designed dimensions with the elastic members of each portion stretched and all effects of the elastic members completely eliminated. Unfolding the diaper 1 means unfolding the side edge portion A1 of the ventral region A and the side edge portion B1 of the dorsal region B separately.

[0012] 3, the diaper 1 comprises a top sheet 2, an absorbent body 4, a side sheet 5, a back sheet 3, and an exterior body 6. The diaper 1 has a configuration in which the exterior body 6, the back sheet 3, the absorbent body 4, and the top sheet 2 are laminated in the thickness direction Z. These components are joined together by a known joining means such as a hot melt adhesive.

[0013] 1 and 2, the absorbent body 4 is disposed across the abdominal region A, the crotch region C, and the back region B. The absorbent body 4 is disposed between the top sheet 2 and the back sheet 3. The absorbent body 4 absorbs liquid excrement such as urine of the wearer (hereinafter, "excrement") from the surface on the top sheet 2 side, and diffuses the excrement inside to retain the excrement. The absorbent body 4 has an absorbent member 7 and a core wrap sheet 41. The absorbent member 7 is mainly composed of an absorbent material capable of retaining excreted liquid. Specifically, in this embodiment, the absorbent member 7 is composed of a mixed laminated fiber layer including fibers 471 and a highly absorbent polymer 470. The absorbent member 7 is a so-called absorbent core. The core wrap sheet 41 covers the absorbent member 7 and has a function of, for example, maintaining the shape of the absorbent member 7. The core wrap sheet 41 is formed of, for example, a thin, soft paper like tissue paper or a liquid-permeable nonwoven fabric. The absorbent body 4 will be described in detail later.

[0014] The top sheet 2 is disposed so as to contact the wearer's skin when the diaper 1 is worn. The top sheet 2 is disposed at least on the skin side (upper side in the thickness direction Z) of the absorbent body 4. In the example shown in Fig. 3, the top sheet 2 is disposed so as to extend from the skin side of the absorbent body 4 to the side edge portions 4s in the lateral direction Y, and further wrap around to the non-skin side of the absorbent body 4. The top sheet 2 is configured as a liquid-permeable sheet material and is formed of a nonwoven fabric containing synthetic or natural fibers. Materials commonly used in the technical field of absorbent articles can be used as the material for the top sheet 2. Various nonwoven fabrics can be used as the sheet material, such as nonwoven fabrics produced by the carding method, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics and needlepunched nonwoven fabrics, and meltblown nonwoven fabrics, spunlace nonwoven fabrics and needlepunched nonwoven fabrics.

[0015] The exterior body 6 is disposed on the non-skin side (lower in the thickness direction Z) of the absorbent body 4, more specifically on the non-skin side of the backsheet 3, and forms, for example, the outer surface of the non-skin side of the diaper 1. From the viewpoint of realizing a good feel against the skin, the exterior body 6 is preferably made of a nonwoven fabric, and further, from the viewpoint of imparting leakproofness, it is preferable that the exterior body 6 has functions such as low liquid permeability, water vapor permeability, and water repellency. In the example shown in FIG. 3, the exterior body 6 includes a skin side sheet 61 and a non-skin side sheet 62. 1 and 2, the exterior body 6 forms a waist opening 1W and leg openings 1L. The exterior body 6 further includes a waist elastic member 63 arranged along the waist opening 1W and a leg elastic member 64 arranged along the leg openings 1L. The exterior body 6 is preferably composed of a plurality of sheet materials, and the waist elastic member 63 and the leg elastic member 64 are arranged, for example, between a skin side sheet 61 and a non-skin side sheet 62. The exterior body 6 has leg gathers G3 formed by arranging the leg elastic members 64 in the circumferential direction of the leg openings 1L.

[0016] A pair of side sheets 5 are disposed on the skin side of the lateral direction Y side of the top sheet 2, forming a three-dimensional gather G2. Specifically, the non-skin side end of the side sheet 5 is joined to a non-skin side member (the back sheet 3 in the example of FIG. 3) by adhesive, heat sealing, or the like. On the other hand, the skin side end of the side sheet 5 is configured as a free end that is not joined to other members, and a thread-like or band-like tip-proximal elastic member 51 is disposed. The tip-proximal elastic member 51 is disposed near the tip 53 of the three-dimensional gather G2. In the example shown in the figure, one tip-proximal elastic member 51 is disposed, but multiple pieces may be disposed. The tip-proximal elastic member 51 extends in the vertical direction X and is attached to the side sheet 5 in a stretched state. As a result, when worn, the skin side end of the side sheet 5 stands up against the skin side due to contraction of the tip-proximal elastic member 51, forming the three-dimensional gather G2. The side sheet 5 is made of a sheet material having functions such as poor liquid permeability and water repellency, and is made of a nonwoven fabric as an example.

[0017] The back sheet 3 is disposed on the non-skin side of the absorbent body 4. In this embodiment, the back sheet 3 is made of a resin film. The back sheet 3 may have functions such as poor liquid permeability and water repellency. As described later, the back sheet 3 may also have moisture permeability. The back sheet 3 is disposed between the absorbent body 4 and the exterior body 6. The back sheet 3 is bonded to the non-skin side of the absorbent body 4 and the exterior body 6 with an adhesive. The back sheet 3 will be described in detail later.

[0018] [Absorber composition] As shown in FIG. 4, the absorbent body 4 extends in the longitudinal direction X in the crotch region C and has a pair of deformation guides 42 disposed on either side of the center in the lateral direction Y. The deformation guide portion 42 is a portion that becomes the starting point of folding of the absorbent body 4. The deformation guide portion 42 may be configured in any manner that can guide the folding of the absorbent body 4, and may be configured, for example, by any of the slits, low basis weight portions, compressed portions, or portions with creases of the absorbent member 7. The slits serving as the deformation guides 42 refer to through-holes that have an elongated shape in a plan view and penetrate the absorbent member 7 in the thickness direction Z. The low weight portion refers to a portion of the absorbent member 7 having a lower weight than the surrounding area. The compressed portion refers to a portion where the absorbent member 7 is compressed and reduced in thickness by compression processing. The portion with the crease is a portion where the crease has been formed by a process such as folding and pressing the absorbent body 4 or the absorbent member 7. Of these, from the viewpoint of reliably inducing bending, the deformation guide 42 is preferably configured with a slit or a low basis weight portion, and more preferably configured with a slit as shown in Figs. 3 to 5.

[0019] The deformation guide portion 42 may be disposed at least in the crotch region C, and may extend to at least one of the abdominal region A and the dorsal region B. In addition, the deformation guide portion 42 is not limited to a configuration extending over the entire length of the crotch region C, and may extend in the longitudinal direction X in at least a part of the crotch region C. The phrase "the deformation inducing portion 42 extends in the longitudinal direction X" is not limited to a mode in which the deformation inducing portion 42 extends parallel to the longitudinal direction X, but may be any mode in which the deformation inducing portion 42 extends from the ventral side to the dorsal side as a whole. The shape of the deformation inducing part 42 in plan view is not particularly limited as long as it is elongated in the vertical direction X. In the example shown in Fig. 4, the deformation inducing part 42 is configured in a linear (strip) shape, and the dimension in the width direction perpendicular to the extension direction of the deformation inducing part 42 is substantially constant. Alternatively, the dimension in the width direction of the deformation inducing part 42 may change along the extension direction.

[0020] The center in the lateral direction Y of the absorbent body 4 means a region on a vertical center line CL that divides the diaper 1 into two equal parts in the lateral direction Y. That is, the pair of deformation guide parts 42 are disposed on both sides of the vertical center line CL in the lateral direction Y. The pair of deformation guide parts 42 divide the diaper 1 into a central region 43 and a side region 44.

[0021] That is, the absorbent body 4 has a central region 43 located between a pair of deformation guides 42 and side regions 44 located on the outer sides in the lateral direction Y of the central region 43 . The central region 43 is a region sandwiched between a pair of deformation inducing portions 42. That is, as shown in Fig. 4, a side edge portion 43s of the central region 43 in the horizontal direction Y is a boundary portion with the deformation inducing portion 42, and coincides with an inner edge portion on the inner side in the horizontal direction Y of the deformation inducing portion 42. An end portion of the central region 43 in the vertical direction X is a portion connecting the ends of the pair of deformation inducing portions 42 in the vertical direction X. The side regions 44 are regions located outward in the lateral direction Y from side edge portions 43s of the central region 43 (that is, inner edge portions of the deformation guide portions 42).

[0022] Here, since the width of the wearer's crotch is generally narrower than the width of the absorbent body 4 in the lateral direction Y, when the diaper is worn, the absorbent body 4 bends from the deformation guide portion 42 as a starting point. That is, as shown in FIG. 5, the absorbent body 4 deforms to fit into the wearer's crotch K, and the central region 43 and the side regions 44 rise up toward the skin side. This causes the absorbent body 4 to deform into a concave shape with the central region 43 as the bottom and the side regions 44 as the upright portions. Based on the concave deformation of the absorbent body 4, the top sheet 2 also deforms, forming a recess R on the skin side of the diaper 1, which makes it easier for excrement such as urine and feces to temporarily accumulate and makes it easier for more excrement to be supplied to the central region 43.

[0023] 3 and 5, the absorbent member 7 has a skin side layer 40 located on the skin side and a non-skin side layer 47 located on the non-skin side. Both the skin side layer 40 and the non-skin side layer 47 are composed of mixed stacked fiber layers containing a superabsorbent polymer 470 and fibers 471. The absorbent member 7 is formed by continuously integrating the skin side layer 40 and the non-skin side layer 47 in the thickness direction Z through a stacking process so that the superabsorbent polymer 470 is unevenly distributed in the thickness direction.

[0024] The non-skin side layer 47 has a higher content of superabsorbent polymer than the skin side layer 40, and the absorbent member 7 is configured so that the superabsorbent polymer 470 is unevenly distributed in greater amounts in the non-skin side layer 47 than in the skin side layer 40. The non-skin side layer 47 may be composed of only the superabsorbent polymer 470, or may contain a small amount of fibers 471 and superabsorbent polymer 470. In addition, "the superabsorbent polymer is unevenly distributed in greater amounts in the non-skin side layer than in the skin side layer" also includes a configuration in which the skin side layer does not contain superabsorbent polymer. 3 and 5 are shown as if the skin side layer 40 does not contain the superabsorbent polymer 470, but the skin side layer 40 may contain the superabsorbent polymer 470 as long as the content of the superabsorbent polymer 470 is lower than that of the non-skin side layer 47. The content (mass %) of the superabsorbent polymer in the skin side layer 40 (non-skin side layer 47) is the ratio of the mass of the superabsorbent polymer to the total mass of the skin side layer 40 (non-skin side layer 47) per unit area. The non-skin side layer 47 can be said to be a high superabsorbent polymer content layer having a higher content of superabsorbent polymer than the skin side layer 40.

[0025] As shown in FIGS. 3 to 5, the central region 43 has a first region 81 where only the non-skin side layer 47 is present, and a second region 82 where both the non-skin side layer 47 and the skin side layer 40 are present in the thickness direction Z. In the central region 43, the skin side layer 40 has one slit 46 extending in the vertical direction X penetrating the thickness direction Z. The slit 46 has an elongated shape in a plan view and penetrates the skin side layer 40 in the thickness direction Z. In the central region 43, only the non-skin side layer 47 is present on the non-skin side of the slit 46, and the slit 46 forms a space S of the first region 81. The phrase "the slits 46 extend in the longitudinal direction X" does not necessarily mean that the slits 46 extend parallel to the longitudinal direction X, but may mean that the slits 46 extend from the ventral side to the dorsal side as a whole. The number of slits 46 forming the first region 81 is not limited to one, but may be multiple, and an example in which there are multiple slits will be described later in a third embodiment.

[0026] 3 and 5, the absorbent member 7 has a space S in the first region 81, which is formed by the absence of the skin side layer 40. The space S is formed by the slits 46. In the absorbent member 7, the first region 81 does not contain any constituent fibers that constitute the absorbent member 7, or contains only a small amount of such fibers, and is composed almost entirely of the superabsorbent polymer 470.

[0027] The superabsorbent polymer 470 contained in the non-skin-side layer 47 in the first region 81 does not adhere to other members when absorbing water. Here, "does not adhere to other members when absorbing water" means that when the central region 43 absorbs excreted liquid, the superabsorbent polymer 470 in the first region 81 is in a state where it can be moved by finger pressure when a caregiver (hereinafter referred to as "caregiver") assists in putting on the diaper touches the diaper 1 from the outer surface side (the exterior body 6 side). Although detailed effects will be described later, in the present invention, the first region 81 consisting of only the non-skin-side layer 47 containing a high proportion of superabsorbent polymer 470 is provided in the central region 43 of the diaper 1, so that the caregiver can touch the diaper 1 from the exterior body 6 side and feel the presence of the superabsorbent polymer 470 that has swelled and become gelatinous due to water absorption, thereby understanding the excretion state.

[0028] 3 and 5, in the diaper 1 of the first embodiment, the absorbent body 4 has absorbent body elastic members 45 disposed in the side regions 44 and extending in the longitudinal direction X. The diaper may not have the absorbent body elastic members 45. The absorber elastic member 45 is a strip-shaped or thread-shaped elastic member. The phrase "the absorber elastic member 45 extends in the longitudinal direction X" does not mean that the absorber elastic member 45 is parallel to the longitudinal direction X, but includes a mode in which the absorber elastic member 45 extends from the ventral side to the dorsal side as a whole. The absorber elastic members 45 are attached to the left and right side edges of the absorber 4 by adhesive or the like in a state stretched from its natural length. The absorber elastic members 45 extend at least in the crotch region C, and may extend to the ventral side and / or the dorsal side of the side regions 44 in the longitudinal direction X.

[0029] In the above configuration, the elastic members 45 for the absorber apply a contractile force along the longitudinal direction X to the side regions 44 of the absorber 4, forming absorber gathers G1 on both side edges of the absorber 4. This makes it easier for the side regions 44 to stand up from the deformation guides 42 when worn. Therefore, when worn, the absorber 4 can stably maintain a concave shape, making it easier for excrement to accumulate in the recesses R, and making it easier for more excrement to be supplied to the central region 43.

[0030] The absorbent body elastic member 45 is preferably disposed at the side edge portion 4s in the lateral direction Y of the absorbent body 4. This allows the entire side region 44 to stand up stably. In this case, from the viewpoint of preventing the absorbent body elastic member 45 from falling off, the absorbent body elastic member 45 is preferably disposed on the outer surface of the side edge portion 4s (e.g., on the core wrap sheet 41) and covered by the top sheet 2. As another embodiment in which the absorbent body elastic member 45 is disposed at the side edge portion 4s, it may be disposed between the side edge portion of the absorbent member 7 in the lateral direction Y and the core wrap sheet 41.

[0031] [Back sheet configuration] The back sheet 3 has moisture permeability from the viewpoint of releasing water vapor derived from excreted fluids, sweat, etc. to the outside and suppressing stuffiness. "Moisture permeability" means the property of water vapor diffusing from a high humidity side to a low humidity side according to the second law of thermodynamics without air movement. Moisture permeability can be evaluated by the value of moisture permeability measured based on, for example, JIS Z0208.

[0032] The moisture permeability can be measured in accordance with JIS Z0208. First, a cup containing calcium chloride as a moisture absorbent is prepared, and the cup is placed so that it is horizontal. The mass of calcium chloride before the test is measured in advance. A test piece is prepared by cutting the back sheet into a circle with a diameter 10 mm larger than the inner diameter of the cup, and the test piece is placed on the upper edge of the cup and adjusted so that the periphery of the test piece is located on a concentric circle of the upper edge of the cup. A ring-shaped packing is prepared along the upper edge of the cup, and the packing is pressed so that the periphery of the test piece is in close contact with the upper edge of the cup. Furthermore, a ring-shaped weight is placed on top of it, and a test specimen is prepared in which a moisture-permeable film is fixed to the upper edge of the cup. This test specimen is left for 1 hour at a temperature of 30°C ± 0.5°C and a humidity of 90 ± 2% RH, and the mass of calcium chloride after the test is measured. The value obtained by subtracting the mass of calcium chloride before the test from the mass of calcium chloride after the test is calculated, and this is used as the water vapor transmission surface of the test specimen for 100 cm. 2 The moisture permeability is calculated by converting it into a permeability value.

[0033] In order to achieve moisture permeability, the back sheet 3 is preferably composed of a moisture permeable film having a plurality of fine pores (microvoids). The moisture permeable film includes, for example, a resin film, and may have a single-layer structure or a laminated structure. The moisture permeable film can be obtained, for example, by melt-kneading a hydrophobic thermoplastic resin (such as a polyolefin resin) and inorganic fine particles (such as calcium carbonate) that are incompatible with the thermoplastic resin to form a film, and then stretching the film uniaxially or biaxially. The film can be formed, for example, by an inflation method, a T-die method, or the like.

[0034] The backsheet 3 is disposed so that the direction in which its tear strength is high is parallel to the longitudinal direction of the absorbent body 4, i.e., the longitudinal direction X. Typically, the moisture-permeable film constituting the backsheet 3 has a high tear strength in its MD direction, and in the diaper 1 of this embodiment, the backsheet 3 is disposed so that the MD direction of the backsheet 3 is parallel to the longitudinal direction X. In other words, the backsheet 3 has high resistance to lateral tearing in the diaper 1. In the diaper 1, the fiber orientation direction of the exterior body 6 is arranged parallel to the lateral direction Y. The fiber orientation direction of the nonwoven fabric is the direction in which the tear strength is high. In other words, the exterior body 6 in the diaper 1 has high resistance to longitudinal tearing. In this manner, in the diaper 1, the backsheet 3 and the exterior body 6 are disposed so that the direction in which the tear strength is high intersect with the direction in which the tear strength is high.

[0035] The tear strength can be measured according to JIS P8116. Measurement samples of 100 mm in length and 25 mm in width are cut out from each of the backsheet 3 and the exterior body 6 such that the longitudinal direction of the measurement samples coincides with the lateral direction Y of the diaper 1. In addition, measurement samples of 100 mm in length and 25 mm in width are cut out from each of the backsheet 3 and the exterior body 6 such that the longitudinal direction of the measurement samples coincides with the longitudinal direction X of the diaper 1. The tear strength of these measurement samples is measured according to JIS P8116. Then, in the back sheet 3 (outer body 6), the tear strength of a measurement sample having a longitudinal direction in the horizontal direction Y is compared with the tear strength of a measurement sample having a longitudinal direction in the vertical direction X, and the direction parallel to the longitudinal direction of the measurement sample with the higher numerical value is determined to be the direction of the higher tear strength of the back sheet 3 (outer body 6).

[0036] [Effects] In the diaper 1 of the present invention, the backsheet 3 is moisture permeable, and in the central region 43 of the absorbent member 7 in the crotch region C, the superabsorbent polymer 470 is unevenly distributed in a greater amount in the non-skin side layer 47 than in the skin side layer 40, and the central region 43 has a first region 81 in which only the non-skin side layer 47 is present in the thickness direction Z. The absorbent member 7 has a space S in the first region 81 formed by the absence of the skin side layer 40, and the superabsorbent polymer 470 contained in the non-skin side layer 47 present in the first region 81 is configured not to adhere to other members when it absorbs water. With this configuration, the caregiver can grasp the excretion state, more specifically, the excretion state of excreted liquids such as urine, by touch without relying on vision. The details will be explained below.

[0037] In the diaper 1 of the present invention, the central region 43 of the absorbent member 7 of the diaper 1 is provided with a first region 81 having a space S formed by the absence of the skin-side layer 40 and the presence of only the non-skin-side layer 47 containing a high proportion of superabsorbent polymer 470. When the diaper 1 is worn and excreted liquid from the wearer is supplied to the absorbent member 7, the superabsorbent polymer 470 absorbs water and swells, turning the entire water into a gel. The superabsorbent polymer 470 that has expanded and become a gel upon absorbing water can be moved by finger pressure applied by a caregiver when pinching the crotch region C due to the presence of the space S, and the superabsorbent polymer 470 can be kept in a movable state in which it is not fixed to other members when absorbing water.

[0038] This allows the caregiver to pinch the crotch region C of the diaper 1 from the exterior body 6 side and check the excretion state by the feel. In other words, before water absorption, it is difficult to confirm the presence of the superabsorbent polymer 470 by touch even when pinching the crotch region C. In contrast, after water absorption, when the caregiver pinches the crotch region C, the superabsorbent polymer 470, which has absorbed water and swelled into a gel, moves with finger pressure, and the caregiver can easily feel the movement of the superabsorbent polymer 470. By providing the space S in this way, the difference in feel caused by the superabsorbent polymer 470 before and after water absorption is felt more significantly, and the excretion state can be easily checked.

[0039] When the diaper 1 is worn, the excreted liquid absorbed in the absorbent body 4 evaporates as water vapor within the diaper. As the moisture-permeable back sheet 3 is disposed on the non-skin side of the absorbent body 4, water vapor is released through the micropores of the moisture-permeable film that constitutes the back sheet 3. At this time, heat dissipation occurs. In the diaper 1, the absorbent member 7 is unevenly distributed such that the superabsorbent polymer 470 is more abundant in the non-skin-side layer 47 than in the skin-side layer 40. In other words, the non-skin-side layer 47, which contains a high proportion of the superabsorbent polymer 470, is located closer to the highly moisture-permeable back sheet 3 than the skin-side layer 40. In this embodiment, the non-skin-side layer 47 is adjacent to the back sheet 3 through the core wrap sheet 41 in the central region 43. This makes it easier for the above-mentioned heat dissipation phenomenon to occur, and the superabsorbent polymer 470 of the non-skin-side layer 47 that has absorbed water is more likely to cool. In addition, the non-skin-side layer 47 is located closer to the skin than the skin-side layer 40, and is located in a position where the wearer's skin temperature is not easily transmitted, so that the superabsorbent polymer 470 is more likely to cool. In this way, the superabsorbent polymer 470 is adjacent to the back sheet 3, making it easier for the heat dissipation phenomenon to occur, and the caregiver is more likely to feel a cold sensation when touching the exterior body 6 of the diaper 1. The diaper is warm due to body heat etc. immediately after urination, but if the diaper is worn for a long time and a large amount of urine is excreted, the diaper 1 becomes cold. By touching the crotch region C of the diaper 1 from the exterior body 6 side, the caregiver can more easily check the excretion status, such as the amount of excreted liquid, by not only feeling the difference in feel before and after the superabsorbent polymer 470 has absorbed water, but also by feeling hot and cold.

[0040] In addition, because the back sheet 3 of the diaper 1 is moisture permeable, when the amount of excreted liquid increases, the clothing covering the diaper 1 becomes damp due to water vapor released through the micropores of the moisture permeable film that constitutes the back sheet 3. This allows the caregiver to more easily check the excretion status, such as the amount of excreted liquid, based on the moisture state of the clothing covering the diaper 1.

[0041] Furthermore, in the diaper 1 of this embodiment, the absorbent member 7 is provided with a pair of deformation guides 42 from the viewpoint of making it easier to check the excretion state of excreted liquid such as urine by touch. With this configuration, as described above, when worn, the absorbent body 4 bends starting from the deformation guide portion 42, the absorbent body 4 deforms to fit into the wearer's crotch region K, and the side regions 44 rise up from the central region 43 toward the skin. As a result, the absorbent body 4 deforms into a concave shape with the central region 43 as the bottom and the side regions 44 as the rising portions, and more excreted liquid is likely to be concentrated in the central region 43 of the crotch region C, which is an area that is easy for a caregiver to touch when checking the excretion state, making it even easier to check the excretion state by touch.

[0042] In this way, the diaper of the present invention allows the wearer to grasp the excretion state, more specifically, the excretion state of excreted liquids such as urine, by the sense of touch without relying on visual inspection. This allows the wearer to check the excretion status by touch even in a situation where the indicator is difficult to see, such as in a dark place with low lighting, and there is no need to remove the clothes covering the diaper to see the indicator. In addition, since the wearer's excretion status can be checked by touch in a dark place without bright lighting, the wearer's sleep is not disturbed and the burden on both the caregiver and the wearer can be reduced. In addition, it is easy for visually impaired caregivers to check the excretion status.

[0043] In the diaper 1 of this embodiment, the absorbent body 4 is provided with elastic members 45 for the absorbent body that are disposed in the side regions 44 and extend in the longitudinal direction, from the viewpoint of making it easier to check the excretion state by touch. As described above, the absorbent gathers G1 are formed on both side edges of the absorbent 4 by the elastic members 45 for the absorbent, and when worn, the side regions 44 tend to stand up starting from the deformation guide portions 42, which makes it easier for more excretory liquid to be concentrated in the central region 43, which is an area that is easily touched when checking the excretory state, making it even easier to check the excretory state by touch.

[0044] In the diaper 1, the backsheet 3 and the exterior body 6 are preferably arranged so that the direction in which the tear strength of the backsheet 3 is high intersect with the direction in which the tear strength of the exterior body 6 is high. In the diaper 1, by arranging the backsheet 3 so that the direction of high tear strength is parallel to the longitudinal direction X, the backsheet 3 is less likely to break when a caregiver pinches the crotch region C of the diaper 1. In the diaper 1, by arranging the backsheet 3 and the exterior body 6 so that the direction of high tear strength of the backsheet 3 intersects with the direction of high tear strength of the exterior body 6, the pressure applied by the fingers when pinching the crotch region C to check the excretion state can be dispersed, and it is possible to prevent the nail or finger from penetrating through the exterior body 6, backsheet 3, or other members.

[0045] [supplementary explanation] From the viewpoints of providing a diaper 1 that is highly moisture permeable and comfortable with little stuffiness, while also ensuring leakproofness and allowing the clothing covering the diaper 1 to become moist and make it easier to check the excretion state, the moisture permeability of the back sheet 3 measured in accordance with the above-mentioned JIS Z0208 is preferably 1.5 g / 100 cm 2 h or more, preferably 1.7 g / 100 cm 2 h or more, preferably 3.6 g / 100 cm 2 h or less, preferably 3.4 g / 100 cm 2 ·h or less. In order to achieve such moisture permeability, the back sheet 3 is preferably a moisture permeable film 30 containing a plurality of fine pores.

[0046] In the back sheet 3, it is preferable that the pore volume per unit mass of the micropores having an opening diameter in the range of 0.06 μm to 0.16 μm is larger than the pore volume per unit mass of the micropores having an opening diameter in the range of 2.5 μm to 3.5 μm. This allows a large number of micropores having an opening diameter in the range of 0.06 μm to 0.16 μm to be formed, thereby increasing the permeability of water vapor (moisture). On the other hand, the number of micropores having an opening diameter in the range of 2.5 μm to 3.5 μm can be regulated, thereby more reliably preventing moisture leakage. Therefore, a back sheet 3 that is both moisture permeable and leakproof can be obtained.

[0047] (Method of measuring pore volume) The pore volume can be measured by the following method in accordance with the mercury intrusion method specified in JIS R 1655. First, a measurement sample of a predetermined size (for example, 10 mm x 10 mm) is cut out from the moisture-permeable film 30 to be measured. This measurement sample is set in a mercury porosimeter (for example, "Autopore IV9520", manufactured by Shimadzu Corporation), and the pore size distribution in the pore diameter range of 0.06 μm to 3.5 μm is measured. Based on the obtained pore size distribution (see FIG. 6), the cumulative pore volume in the pore diameter range of 0.06 μm to 0.16 μm and the cumulative pore volume in the pore diameter range of 2.5 μm to 3.5 μm are measured. If the cumulative pore volume in the pore diameter range of 0.06 μm or more and 0.16 μm or less is greater than the cumulative pore volume in the pore diameter range of 2.5 μm or more and 3.5 μm or less, it is determined that "the pore volume per unit mass of micropores having pore diameters in the range of 0.06 μm or more and 0.16 μm or less is greater than the pore volume per unit mass of micropores having pore diameters in the range of 2.5 μm or more and 3.5 μm or less."

[0048] As such, a method for forming a large number of small micropores 37 includes, for example, a method of uniformly stretching the moisture-permeable film 30. As shown in FIG. 7(A), when the moisture-permeable film 30 is stretched non-uniformly, a region that is not sufficiently stretched is generated in a part of the moisture-permeable film 30, and a portion where the small inorganic fine particles 36 cannot be sufficiently opened (unopened portion 38 shown by a thick line) may be formed. Furthermore, in the area of ​​the moisture-permeable film 30 where the stretching force is large, the inorganic fine particles 36 are largely dragged to form large micropores 37, and in the area where the stretching force is small, the inorganic fine particles 36 are not dragged so much to form small micropores 37. For this reason, the size of the micropores 37 may not be correlated with the size of the inorganic fine particles 36.

[0049] In contrast, as shown in Fig. 7(B), when the moisture-permeable film 30 is stretched uniformly, a sufficient stretching force is applied to the small inorganic fine particles 36 as well. As a result, the portion that was an unopened portion 38 in the example of Fig. 7(A) becomes a sufficiently opened micropore 37 (portion shown by a thick line) in Fig. 7(B), and the number of small micropores 37 can be increased. Furthermore, when the moisture-permeable film 30 is stretched uniformly within its plane, micropores 37 corresponding to the size of the inorganic fine particles 36 are easily formed, so that there is a tendency for the size of the micropores 37 and the size of the inorganic fine particles 36 to be positively correlated.

[0050] As an index of whether the moisture-permeable film 30 is uniformly stretched, the moisture-permeable film 30 has a thickness of 0.01 μm or less in a plan view seen from the thickness direction Z. 2 More than 0.5μm 2 The pore diameter of the micropores adjacent to the inorganic fine particles having a size of 1.0 μm or less 2 More than 1.5μm 2 It is preferable that the diameter of the micropores is smaller than the diameter of the micropores adjacent to the inorganic fine particles having the following size: In the above configuration, since the moisture-permeable film 30 is uniformly stretched, the number of small micropores 37 adjacent to the small inorganic fine particles 36 can be increased, and the moisture-permeable film 30 having high moisture permeability and leak prevention can be obtained.

[0051] (Method of measuring size of inorganic fine particles and pore diameter of fine pores) An evaluation sample of a predetermined size (for example, 10 mm x 10 mm) is cut out from the moisture-permeable film 30. The cut-out evaluation sample is fixed in place in a standard manner and imaged at 1000 times magnification using a scanning electron microscope (SEM). From one image, image analysis techniques are used to extract the outlines of the portions corresponding to the inorganic microparticles and the adjacent micropores. The size of the area corresponding to the extracted inorganic microparticles and the size of the area corresponding to the adjacent micropores are measured. The pore diameter of the micropores is obtained by calculating the circle equivalent diameter from the size (area) of the area corresponding to the extracted micropores. Images of 100 locations are captured from one sheet of moisture-permeable film 30, and the images are analyzed to obtain an average diameter of 0.01 μm. 2 More than 0.5μm 2The average pore size of the micropores adjacent to inorganic fine particles having a size of 1.0 μm or less and 2 More than 1.5μm 2 The average pore diameter of the micropores disposed adjacent to the inorganic fine particles having the following sizes is calculated.

[0052] As described above, when the micropores 37 are formed according to the size of the inorganic fine particles 36, the pore diameter of the micropores 37 can be controlled by controlling the size distribution of the inorganic fine particles 36. From this viewpoint, in the moisture-permeable film 30, the pore diameter of the micropores 37 can be controlled within a range of 0.01 μm in plan view as seen from the thickness direction Z. 2 More than 0.5μm 2 The number of particles per unit area of ​​inorganic fine particles 36 with a size of 0.5 μm or less is 2 2.0μm or more 2 The number of particles per unit area of ​​inorganic fine particles 36 having a size of less than 2.0 μm 2 The number of particles per unit area of ​​the above inorganic fine particles 36 is 0.5 μm 2 2.0μm or more 2 It is preferable that the number of particles per unit area is smaller than the number of inorganic fine particles 36 having a size of less than 1 mm. With the above-mentioned configuration, a large number of minute pores 37 can be formed, and a moisture-permeable film 30 that satisfies both moisture permeability and leak prevention properties can be obtained.

[0053] The basis weight of the back sheet 3 is preferably 20 g / m2 so as to easily follow the movement of the wearer. 2 Less than 18g / m 2 From the viewpoint of water resistance, it is preferably 11 g / m 2 More preferably, 13 g / m 2 From the viewpoint of achieving both the ability to follow the wearer's movements and water resistance, it is preferable that the thickness be 11 g / m 2 More than 20g / m2 and less than 13g / m2 2 More than 18g / m 2 The following is the result.

[0054] The width in the horizontal direction Y of the slit 46 that forms the space S of the first region 81 is preferably 3 mm or more, and more preferably 4 mm or more, from the viewpoint of grasping the excretion state of the excreted liquid by touch, and is preferably 30 mm or less, and more preferably 20 mm or less, from the viewpoint of diffusing the excreted liquid in the front-to-back direction and increasing the absorption efficiency, and is preferably 3 mm or more and 30 mm or less, and more preferably 4 mm or more and 20 mm or less.

[0055] The depth dimension of the slit 46 forming the space S in the first region 81, in other words the dimension (height) in the thickness direction Z of the skin side layer 40, is preferably 1 mm or more, more preferably 2.5 mm or more, from the viewpoint of grasping the excretion state of excreted liquid by touch, and is preferably 20 mm or less, more preferably 10 mm or less, from the viewpoint of maintaining the absorbent body in a concave shape when worn, preferably 1 mm or more and 20 mm or less, more preferably 2.5 mm or more and 10 mm or less. The width and height of the slit in the horizontal direction Y are values ​​measured before water absorption.

[0056] As the superabsorbent polymer 470, various known polymers can be used without any particular limitation, and examples thereof include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, crosslinked sodium polyacrylate, (starch-acrylic acid) graft copolymer, (isobutylene-maleic anhydride) copolymer and its saponification product, polyaspartic acid, etc. As the fibers 471 constituting the mixed stacked fiber layer, any known fiber that has been conventionally used as a constituent material of an absorbent core can be used without any particular limitation. For example, hydrophilic fibers such as pulp fibers, rayon fibers, cotton fibers, cellulose acetate, polyolefin fibers such as polyethylene and polypropylene, condensation fibers such as polyester and polyamide, etc. can be used. The superabsorbent polymers and fibers can each be used alone or in combination of two or more kinds.

[0057] The configuration of the absorbent member is not limited to that of the absorbent member 7 of the first embodiment. Diapers having other forms of absorbent members will be described below as second and third embodiments. In the following description of the second and third embodiments, the same reference numerals may be used for configurations already mentioned, and description thereof may be omitted. In addition, the description of the second and third embodiments will focus on configurations different from the first embodiment.

[0058] In the diapers according to the second and third embodiments described below, as in the diaper 1 of the first embodiment, the backsheet is moisture permeable, and in the central region of the absorbent member in the crotch region C, the superabsorbent polymer is unevenly distributed in the non-skin side layer rather than in the skin side layer, and the central region has a first region in which only the non-skin side layer is present in the thickness direction Z. The absorbent member has a space S formed by the absence of the skin side layer in the first region, and the superabsorbent polymer contained in the non-skin side layer present in the first region is configured not to adhere to other members when absorbing water. With this configuration, the caregiver can grasp the excretion state, more specifically, the excretion state of excreted liquids such as urine, by touch without relying on vision. The second and third embodiments will be described below.

[0059] <Second embodiment> As shown in FIG. 8, the diaper 1A according to the second embodiment includes a top sheet 2, an absorbent body 4A, a side sheet 5, a back sheet 3, and an exterior body 6.

[0060] The absorbent body 4A has an absorbent member 7 and a core wrap sheet 41. The absorbent member 7A is mainly composed of an absorbent material capable of retaining excreted liquid. Specifically, in this embodiment, the absorbent member 7A is composed of a mixed stack containing fibers 471 and a highly absorbent polymer 470. The absorbent member 7A is a so-called absorbent core. The absorbent member 7 of the first embodiment is a mixed stack in which the skin side layer and the non-skin side layer are integrally formed so as to be continuous in the thickness direction, whereas the absorbent member 7A of this embodiment has the skin side layer 40A and the non-skin side layer 47A as separate, discontinuous layers.

[0061] As shown in Fig. 8, the absorbent member 7A has a skin side layer 40A located on the skin side and a non-skin side layer 47A located on the non-skin side. The skin side layer 40A and the non-skin side layer 47A are laminated. Both the skin side layer 40A and the non-skin side layer 47A are composed of mixed stacked fiber layers containing superabsorbent polymer 470 and fibers 471. The skin side layer 40A and the non-skin side layer 47A have different contents of superabsorbent polymer 470. In the absorbent member 7A, the non-skin side layer 47A has a higher superabsorbent polymer content than the skin side layer 40A, and the absorbent member 7A is configured such that the superabsorbent polymer 470 is unevenly distributed in a larger amount in the non-skin side layer 47A than in the skin side layer 40A. In this way, by configuring the absorbent member 7A to be a laminate of at least two mixed stacked fiber layers, the content ratio of superabsorbent polymer in each layer can be made different, making it easier to unevenly distribute the superabsorbent polymer in the thickness direction Z.

[0062] In the diaper 1A, the central region 43 has a first region 81 where only the non-skinside layer 47A is present, and a second region 82 in the thickness direction Z where both the non-skinside layer 47A and the skinside layer 40A are present. In the central region 43, the skin side layer 40A has one slit 46 extending in the longitudinal direction X penetrating the thickness direction Z. The slit 46 forms a first region 81.

[0063] In this way, the absorbent member 7A has a space S in the first region 81, which is formed by the absence of the skin side layer 40A. The space S is formed by the slits 46. In the absorbent member 7A, the first region 81 is composed only of the non-skin side layer 47A in which the superabsorbent polymer 470 is present at a high ratio. The space S in the first region 81 is formed by the slits 46 provided in the skin side layer 40A. The superabsorbent polymer 470 contained in the non-skin side layer 47A present in the first region 81 does not adhere to other members when absorbing water. This allows the caregiver to grasp the excretion state, more specifically the excretion state of excretory fluids such as urine, by touch without having to rely on vision.

[0064] <Third embodiment> As shown in FIG. 9, a diaper 1B according to the third embodiment includes a top sheet 2, an absorbent body 4B, a side sheet 5, a back sheet 3, and an exterior body 6.

[0065] The absorbent body 4B has an absorbent member 7 and a core wrap sheet 41. The absorbent member 7B is mainly composed of an absorbent material capable of retaining excreted liquid. Specifically, in this embodiment, the absorbent member 7B is formed by laminating a skin side layer 40B and a non-skin side layer 47B. The skin side layer 40B is formed of a so-called absorbent core consisting of a mixed stacked fiber layer containing fibers 471 and a superabsorbent polymer 470. The non-skin side layer 47B is formed of a superabsorbent polymer sheet. The non-skin side layer 47B formed of a superabsorbent polymer sheet has a pair of hydrophilic fiber sheets 71a and 71b and a superabsorbent polymer layer 72 sandwiched between the hydrophilic fiber sheets 71a and 71b. The superabsorbent polymer layer 72 has a plurality of superabsorbent polymers 470.

[0066] The skin side layer 40B and the non-skin side layer 47B have different contents of superabsorbent polymer 470. In the absorbent member 7B, the non-skin side layer 47B has a higher superabsorbent polymer content than the skin side layer 40B, and the absorbent member 7B is configured so that the superabsorbent polymer 470 is unevenly distributed in greater amounts in the non-skin side layer 47B than in the skin side layer 40B. The basis weight of the superabsorbent polymer in the non-skin side layer 47B formed from a superabsorbent polymer sheet is greater than the basis weight of the superabsorbent polymer in the skin side layer 40B formed from a mixed stacked fiber layer. In this manner, by forming the absorbent member 7B by laminating the mixed stacked fiber layer and the superabsorbent polymer sheet, it becomes easy to unevenly distribute the superabsorbent polymer in the thickness direction Z.

[0067] In the diaper 1B, the central region 43 has a first region 81 where only the non-skinside layer 47B is present, and a second region 82 in the thickness direction Z where both the non-skinside layer 47B and the skinside layer 40B are present. In the central region 43, the skin side layer 40B has two slits 46 extending in the vertical direction X penetrating through the thickness direction Z. The slits 46 form a first region 81. In this manner, a plurality of slits 46 forming the space S may be provided, and a plurality of slits 46 can be provided in the first and second embodiments as well.

[0068] In this way, the absorbent member 7B has a space S in the first region 81 formed by the absence of the skin side layer 40B. In the absorbent member 7A, the first region 81 is composed only of the non-skin side layer 47B in which the superabsorbent polymer 470 is present at a high ratio. The space S in the first region 81 is formed by slits 46 provided in the skin side layer 40B. The superabsorbent polymer 470 contained in the non-skin side layer 47B in the first region 81 does not adhere to other members when absorbing water. This allows the caregiver to grasp the excretion state, more specifically the excretion state of excretory fluids such as urine, by touch without having to rely on vision.

[0069] In the diaper 1B of this embodiment, the non-skin side layer 47B made of a superabsorbent polymer sheet is disposed across the entire width of the absorbent 4 in the lateral direction Y, whereas the skin side layer 40B is disposed only in the central region 43, not in the side region 44 in the lateral direction Y. With this configuration, in the absorbent member 7B, the central region 43, where the skin side layer 40B and the non-skin side layer 47B are laminated, has a higher rigidity than the side region 44, where only the non-skin side layer 47B is present, and a boundary of bending rigidity is formed along both side edges of the skin side layer 40B in the lateral direction Y. The boundary of bending rigidity is the deformation guide portion 42, which is the starting point of the bending of the absorbent 4B. When worn, the absorbent 4 is bent starting from the deformation guide portion 42, and as shown in FIG. 9, the absorbent 4B is deformed to fit into the crotch region K of the wearer, and the central region 43 to the side region 44 rise up toward the skin side. As a result, the absorbent body 4 is deformed into a concave shape with the central region 43 as the bottom and the side regions 44 as the upright portions, and excreted liquid is easily supplied to the central region 43 in the crotch region C. In this manner, by providing a pair of deformation guides 42, excreted liquid is easily concentrated and supplied in large amounts to the central region 43, which is an area that is easily touched when checking the excretion state, making it even easier to check the excretion state by touch.

[0070] <Other embodiments> Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0071] In the above embodiment, the absorbent article is configured as a pants-type disposable diaper, but is not limited thereto. For example, the absorbent article may be a tape-type disposable diaper, a pants-type sanitary product, a care pad, or the like. [Explanation of symbols]

[0072] 1, 1A, 1B... Disposable diapers (absorbent articles) 3. Back seat 4, 4A, 4B…Absorbent 7, 7A, 7B...Absorbent material 40, 40A, 40B…skin side layer 42…Deformation induction section 43…Central area 44…Side area 47, 47A, 47B…Non-skin side layer 81…First area 82…Second area 470...Highly absorbent polymer A...ventral region B...Dorsal region C...Inseam area S…Space

Claims

1. An absorbent article having a vertical direction extending from a wearer's abdomen side through a crotch region to a dorsal side, a horizontal direction perpendicular to the vertical direction and corresponding to the left-right direction of the wearer, and a thickness direction perpendicular to the vertical direction and the horizontal direction, and being divided into a abdomen region arranged on the abdomen side, a crotch region arranged in the crotch region, and a dorsal region arranged in the dorsal region, an absorbent body disposed across the ventral region and the dorsal region and including an absorbent member; a moisture-permeable back sheet disposed on the non-skin side of the absorbent body; Equipped with The absorbent member has a pair of deformation guide portions that extend in the vertical direction in the crotch region and are arranged on either side of the center in the horizontal direction, the absorbent member has a central region located between the pair of deformation guides and side regions located laterally outward of the central region, the central region of the absorbent member has a skin-side layer positioned on the skin side and a non-skin-side layer positioned on the non-skin side, the absorbent member contains a superabsorbent polymer, and in the central region, the superabsorbent polymer is unevenly distributed in a larger amount in the non-skin side layer than in the skin side layer; the central region has a first region in which only the non-skinside layer is present, and a second region in which the non-skinside layer and the skinside layer are present in the thickness direction, the absorbent member has a space formed by the absence of the skin side layer in the first region, The highly absorbent polymer contained in the non-skin-side layer in the first region does not adhere to other members when absorbing water. Absorbent articles.

2. The back sheet further includes an exterior body disposed on the non-skin side thereof, The direction in which the tear strength of the back sheet is high intersects with the direction in which the tear strength of the exterior body is high. The absorbent article of claim 1.

3. The absorbent body further includes elastic members disposed in the side regions and extending in the longitudinal direction. The absorbent article according to claim 1 or 2.

4. In the central region, the skin side layer has one or more slits extending in the longitudinal direction and penetrating through the thickness direction, The space is formed by the slit. The absorbent article according to claim 1 or 2.

5. The skin side layer and the non-skin side layer are both mixed stacked fiber layers containing the superabsorbent polymer and fibers, and the skin side layer and the non-skin side layer are continuous in the thickness direction in the second region. The absorbent article according to claim 1 or 2.

6. The skin side layer and the non-skin side layer are both mixed stacked fiber layers containing the superabsorbent polymer and fibers, and the skin side layer and the non-skin side layer are laminated in the thickness direction. The absorbent article according to claim 1 or 2.

7. the skin-side layer is a mixed fiber stack containing the superabsorbent polymer and fibers, the non-skin-side layer is a hydrophilic fiber sheet and a superabsorbent polymer sheet containing the superabsorbent polymer sandwiched between the hydrophilic fiber sheets, the skin-side layer and the non-skin-side layer being laminated in the thickness direction, The basis weight of the superabsorbent polymer in the non-skin side layer is greater than the basis weight of the superabsorbent polymer in the skin side layer. The absorbent article according to claim 1 or 2.

8. The back sheet has a basis weight of 20 g / m ２ is The absorbent article according to claim 1 or 2.

9. The moisture permeability of the back sheet is 1.5 g / 100 cm ２ ・It is greater than or equal to h The absorbent article according to claim 1 or 2.

10. The back sheet is made of a moisture-permeable film having a plurality of micropores, In the back sheet, The pore volume per unit mass of micropores having an opening diameter in the range of 0.06 μm or more and 0.16 μm or less is larger than the pore volume per unit mass of micropores having an opening diameter in the range of 2.5 μm or more and 3.5 μm or less. The absorbent article according to claim 1 or 2.

11. The back sheet is made of a moisture-permeable film having a plurality of micropores, the backsheet has fine calcium carbonate particles disposed adjacent to the micropores; In the back sheet, in a plan view seen from the thickness direction, 0.01 μm ２ More than 0.5 μm ２ The opening diameter of the micropores arranged adjacent to the calcium carbonate particles having a size of 1.0 μm or less ２ More than 1.5 μm ２ The opening diameter of the micropores arranged adjacent to the calcium carbonate particles is smaller than the opening diameter of the micropores arranged adjacent to the calcium carbonate particles having a size of The absorbent article according to claim 1 or 2.

12. The backsheet has a plurality of micropores, the backsheet has fine calcium carbonate particles disposed adjacent to the micropores; In the back sheet, in a plan view seen from the thickness direction, 0.01 μm ２ More than 0.5 μm ２ The number of particles per unit area of ​​the calcium carbonate particles having a size of 0.5 μm or less is ２ 2.0 μm or more ２ The number of particles per unit area of ​​the calcium carbonate particles having the following size is less than 2 μm ２ The number of particles per unit area of ​​the calcium carbonate particles having a size of 0.5 μm or more is ２ 2.0 μm or more ２ The number of particles per unit area of ​​the calcium carbonate particles having the following size is less than The absorbent article according to claim 1 or 2.

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