Absorbent article

Abstract

To provide an absorbent article having good wearing feeling that can effectively prevent misunderstanding on the leakage of excrement.SOLUTION: An absorbent article includes a top sheet, a back sheet having moisture-permeable property, an absorber, an external body, and a hydrophobic cushion layer arranged between the absorber and the back sheet. A second surface which is a non-skin side surface of the absorber has a first opposite region opposed to the cushion layer, and a second opposite region positioned outside in a horizontal direction of the first opposite region and opposed to the back sheet without interposing the cushion layer. The absorber has a first joint that joins the top sheet and is disposed discontinuously on a first surface, which is a skin side surface, and a second joint that joins the cushion layer and is disposed discontinuously in the first opposite region. A proportion of an area occupied by the second joint in the first opposite region is smaller than a proportion of an area occupied by the first joint on the first surface.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] Absorbent articles such as disposable diapers include, for example, a liquid-permeable top sheet, a back sheet, and an absorbent disposed between the top sheet and the back sheet. When the absorbent article absorbs excrement such as urine, the absorbent article is warmed by the wearer's body heat, causing moisture from the excrement to evaporate, making the wearer more likely to feel stuffy. For this reason, from the viewpoint of facilitating the release of water vapor on the skin side to the outside of the absorbent article, for example, absorbent articles including a moisture-permeable back sheet (rear sheet) are known (see Patent Document 1).

[0003] On the other hand, if the backsheet has high moisture permeability, evaporation of moisture from the absorbent body is promoted, and the temperature of the absorbent body decreases due to the heat of vaporization, which may decrease the temperature of the outer surface of the absorbent article. In this case, there is a concern that a caregiver or a wearer may feel the outer surface as cold when changing the diaper, and mistakenly believe that excrement is leaking to the outside. In response to this, a technology is known in which a nonwoven fabric layer is provided between the layer of absorbent material (absorbent body) and the backsheet (see Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-103430 A [Patent Document 2] International Publication No. 2021 / 247471 Summary of the Invention [Problem to be solved by the invention]

[0005] However, if a thick nonwoven fabric layer with high thermal insulation properties is provided between the absorbent body and the back sheet, there is a concern that the movement of the wearer's legs may be hindered, resulting in a poor wearing comfort. Also, if the nonwoven fabric layer is bonded to the absorbent body, the temperature of the nonwoven fabric layer may also tend to decrease with the decrease in the temperature of the absorbent body, resulting in a decrease in the temperature of the outer surface.

[0006] The present invention relates to an absorbent article that can effectively prevent the misidentification of bodily excrement leakage and is comfortable to wear. [Means for solving the problem]

[0007] An absorbent article according to one embodiment of the present invention comprises a liquid-permeable top sheet, a moisture-permeable back sheet, an absorbent body disposed between the top sheet and the back sheet, and an outer body disposed on the non-skin side of the back sheet, and has a vertical direction extending from the wearer's abdominal side through the crotch area to the back 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. The absorbent article comprises: The device further includes a hydrophobic cushion layer disposed between the absorbent body and the backsheet, facing the lateral center portion of the absorbent body. The absorbent body is The first side is the skin side, and a second surface which is the non-skin side. The second surface is A first opposing region opposing the cushion layer in the thickness direction; The cushion cushion sheet has a second opposing region that is located laterally outside the first opposing region and faces the back sheet in the thickness direction without the cushion layer therebetween. The absorbent body further comprises: A first joining portion that joins the top sheet and is discontinuously disposed on the first surface; and a second bonding portion that bonds the cushion layer and is discontinuously disposed in the first opposing region. The proportion of the area of ​​the second bonding portion in the first opposing region is lower than the proportion of the area of ​​the first bonding portion in the first surface. Effect of the Invention

[0008] According to the absorbent article of the present invention, it is possible to effectively prevent the mistaken belief of leakage of body excrement and to improve the wearing comfort. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of an absorbent article (disposable diaper) according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a plan view of the disposable diaper, as viewed from the skin side (top sheet side) in a state in which the elastic members of each portion are stretched and spread out flat. [Diagram 3] FIG. 3 is a schematic cross-sectional view of the disposable diaper taken along line III-III in FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view illustrating the disposable diaper of FIG. 3 when worn by a wearer. [Diagram 5] 1A and 1B are enlarged plan views of a back sheet of the disposable diaper made of a moisture-permeable film, in which (A) shows an example of a non-uniformly stretched moisture-permeable film, and (B) shows an example of a uniformly stretched moisture-permeable film. [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. 11 is a partial cross-sectional view showing an exterior body according to a modified example of the disposable diaper. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following embodiment, an example in which the absorbent article according to the present invention is configured as a pants-type disposable diaper is given. However, the absorbent article of the present invention is not limited thereto, and may be, for example, an open-type disposable diaper, a sanitary article, or the like.

[0011] [Overall composition of disposable diapers] 1 and 2 show a pants-type disposable diaper 1 as an absorbent article according to one 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 disclosure, "the inner side in the lateral direction Y" means the side in the lateral direction Y closer to the vertical center line CL that divides the diaper 1 in half in the lateral direction Y, and "the outer side in the lateral direction Y" means the side away from the vertical center line CL. In the present disclosure, a plan view means that each component is viewed from the thickness direction Z. In the present disclosure, the skin side of each component refers to the side that is located on the skin side of a wearer when wearing the disposable diaper. The non-skin side of each component refers to the clothing side that is located opposite to the skin side of a wearer when wearing the disposable diaper.

[0012] As shown in Figures 1 and 2, the diaper 1 has a waist opening 1W that is placed around the wearer's abdomen, and a pair of leg openings IL that are placed around the wearer's legs, and is placed around the wearer's waist and crotch area. The diaper 1 is divided into a ventral region A arranged on the ventral side of a wearer, a dorsal region B arranged on the dorsal side of the wearer, and a crotch region C located between the ventral region A and the dorsal region B and arranged in the crotch area of ​​the wearer. 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. A leg opening is formed in the crotch region C, and this leg opening forms a leg opening 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 abdominal region A and the side edge portion B1 of the dorsal region B separately.

[0013] 2 and 3, the diaper 1 comprises a top sheet 2, an absorbent body 4, a cushion layer 7, 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 cushion layer 7, the absorbent body 4, and the top sheet 2 are laminated in the thickness direction Z. These components are joined together by a joining means such as a hot melt adhesive.

[0014] The top sheet 2 forms the skin side surface 1a of the diaper 1 and is placed so as to contact the wearer's skin. The top sheet 2 is liquid permeable and is made of, for example, a nonwoven fabric containing synthetic fibers or natural fibers. As a material for the top sheet 2, any sheet material that can be used as a top sheet for absorbent articles can be used as appropriate.

[0015] The absorbent body 4 is disposed between the top sheet 2 and the back sheet 3. The absorbent body 4 absorbs moisture from the wearer's excrement, such as urine, from the surface on the top sheet 2 side, and diffuses the moisture inside to retain the moisture from the excrement. The absorbent body 4 has, for example, an absorbent core 40 and a core wrap sheet 41. The absorbent core 40 is mainly composed of an absorbent material capable of retaining moisture. Specifically, the absorbent core 40 has a structure in which a hydrophilic fiber stack is supported with an absorbent polymer, or a structure made of only a water-absorbent polymer, or the like. The core wrap sheet 41 covers the absorbent core 40 and has a function of, for example, maintaining the shape of the absorbent core 40. The core wrap sheet 41 is formed of, for example, a thin, soft paper such as tissue paper or a liquid-permeable nonwoven fabric.

[0016] The back sheet 3 is disposed on the non-skin side of the absorbent body 4. The back sheet 3 is preferably leak-proof, and is made of, for example, a sheet material having properties such as poor liquid permeability and water repellency. Examples of such sheet materials include a sheet material made of a thermoplastic resin film, a laminate of such a film and a nonwoven fabric, and the like.

[0017] Furthermore, the back sheet 3 has moisture permeability from the viewpoint of releasing water vapor derived from excrement, 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 JIS Z0208, for example. The back sheet 3 having moisture permeability has a moisture permeability value of, for example, 0.5 g / 100 cm. 2 ·hr or more. In order to achieve such moisture permeability, the back sheet 3 preferably contains a plurality of micropores. Note that a detailed method for measuring the moisture permeability and a detailed configuration of the back sheet 3 will be described later.

[0018] The exterior body 6 is disposed on the non-skin side of the backsheet 3 and forms the non-skin side outer surface 1b of the diaper 1. From the viewpoints of realizing moisture permeability, breathability, and a good feel against the skin, the exterior body 6 is preferably made of a nonwoven fabric, and further from the viewpoint of imparting leakage prevention properties, it is preferable that the exterior body 6 has functions such as low liquid permeability and water repellency.

[0019] 1 and 2, the exterior body 6 forms a waist opening 1W and leg openings 1L. The exterior body 6 further includes waistline elastic members 61 arranged along the lateral direction Y in the abdominal region A and the back region B, and leg elastic members 62 arranged along the leg openings 1L. The waist elastic members 61 and leg elastic members 62 may be arranged, for example, between folded sheet materials (see FIG. 3) or between multiple laminated sheet materials (see FIG. 7).

[0020] Furthermore, the diaper 1 preferably includes a pair of side sheets 5. The pair of side sheets 5 are arranged on the skin side of the lateral Y side portions of the top sheet 2, forming a three-dimensional gather 50. Specifically, the non-skin side end of the side sheet 5 is bonded to a non-skin side member (exterior body 6 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 bonded to other members, and a thread-like or strip-like elastic member 51 is arranged thereon. The elastic member 51 extends in the longitudinal direction X and is attached to the side sheet 5 in an elongated 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 elastic member 51, forming the three-dimensional gather 50. The side sheet 5 is made of a sheet material having functions such as poor liquid permeability and water repellency, and as an example, is made of a nonwoven fabric having these functions.

[0021] [Cushion layer composition] The diaper 1 further has a cushion layer 7. The cushion layer 7 is disposed between the absorbent body 4 and the back sheet 3, and faces the central portion in the lateral direction Y of the absorbent body 4. "The central portion in the lateral direction Y of the absorbent body 4" refers to a central region obtained by dividing the absorbent body 4 into three equal parts in the lateral direction Y. The cushion layer 7 needs only to be disposed so as to face at least a part of the central portion in the lateral direction Y of the absorbent body 4, and may extend to the outside of the central portion in the lateral direction Y of the absorbent body 4.

[0022] The cushion layer 7 is made of a sheet material that is hydrophobic and can be elastically deformed in, for example, the thickness direction Z. The cushion layer 7 is made of a sheet material that includes fine spaces therein, for example, a sheet material containing fibers (such as a nonwoven fabric or a laminate). In particular, the cushion layer 7 is preferably made of a nonwoven fabric from the viewpoint of stably maintaining its shape. As the nonwoven fabric, a bulky nonwoven fabric is preferable, and examples of the nonwoven fabric include an air-through nonwoven fabric, a resin-bonded nonwoven fabric, a spunlace nonwoven fabric, and an air-laid nonwoven fabric.

[0023] The term "hydrophobicity" in the cushion layer 7 means that the contact angle with water measured by the following method is 90 degrees or more. (Method of measuring contact angle) A sample (e.g., fiber) of the element that constitutes the surface is cut out from the measurement target (cushion layer 7), and the contact angle of water with the sample is measured. For example, an automatic contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used as the measurement device. Purified water (distilled water, deionized water, etc.) is used to measure the contact angle. The amount of liquid discharged from the inkjet type water droplet discharge part (CTC-25 pulse injector manufactured by Cluster Technology Co., Ltd., with a discharge part aperture diameter of 25 μm) is set to 20 picoliters, and the water droplets are dropped directly above the sample. The dropping state is recorded by a high-speed recording device connected to a horizontally installed camera. From the viewpoint of later image analysis, it is preferable that the recording device is a personal computer with a high-speed capture device built in. In this measurement, images are recorded every 17 msec. In the recorded video, the first image of a water droplet landing on the sample surface (for example, fiber) is analyzed using the attached software FAMAS (software version 2.6.2, analysis method is droplet method, analysis method is θ / 2 method, image processing algorithm is non-reflective, image processing image mode is frame, threshold level is 200, curvature correction is not performed), and the angle between the surface of the water droplet that is in contact with the air and the sample surface is calculated and taken as the contact angle. If the sample is a fiber, the fiber is cut to a fiber length of 1 mm, and the fiber is placed on the sample stage of the contact angle meter and maintained horizontally. The contact angle is measured at two different points for each sample. The contact angles of five samples are measured to one decimal place, and the average value of the measured values ​​at a total of 10 points (rounded off to the second decimal place) is defined as the contact angle of the cushion layer 7 with water. The measurement environment is a room temperature of 22±2°C and a humidity of 65±2% RH.

[0024] The cushion layer 7 is disposed in the center in the lateral direction Y where the absorber 4 is likely to absorb excrement, and is hydrophobic. This effectively prevents excrement held in the absorber 4 from leaking to the outer surface 1b. Furthermore, the cushion layer 7 has minute spaces inside, which allows it to contain air with low thermal conductivity and has a high insulating property. This makes it possible to suppress the associated decrease in temperature of the cushion layer 7 even when the temperature of the absorber 4 decreases due to the heat of vaporization generated when the moisture in the excrement in the absorber 4 evaporates. Therefore, the decrease in temperature of the outer surface 1b via the cushion layer 7 can be suppressed. On the other hand, the cushion layer 7 tends to be bulky and tends to affect the rigidity of the diaper 1. In particular, when the cushion layer 7 extends to the lateral side portions of the crotch region C in the lateral direction Y, the rigidity of the lateral side portions increases, which tends to affect the movement of the wearer's legs and the wearing comfort. Therefore, from the viewpoint of suppressing the deterioration of the wearing comfort due to the cushion layer 7 while enhancing the effect of suppressing the temperature drop of the outer surface 1b by the cushion layer 7, the absorbent body 4 is configured as follows.

[0025] [Absorber composition] As shown in Fig. 3, the absorbent body 4 has a first surface 4a and a second surface 4b. The first surface 4a is the skin side of the absorbent body 4, and the second surface 4b is the non-skin side of the absorbent body 4. In the example of Fig. 3, the first surface 4a and the second surface 4b are formed of a core wrap sheet 41.

[0026] The second surface 4b has two regions: a first facing region 43 and a second facing region 44. The first opposing region 43 faces the cushion layer 7 in the thickness direction Z. The second facing region 44 is located outside the first facing region 43 in the lateral direction Y, and faces the back sheet 3 in the thickness direction Z without the cushion layer 7 therebetween. As described below, the first facing region 43 is joined to the cushion layer 7 by an adhesive or the like. Similarly, the second facing region 44 is preferably joined to the back sheet 3 by an adhesive or the like.

[0027] By providing the second opposing region 44, it is possible to provide a region in the lateral direction Y of the absorbent 4 that does not overlap with the cushion layer 7 in the thickness direction Z, and it is possible to suppress an increase in bending rigidity in the lateral direction Y of the crotch region C. As a result, as shown in Fig. 4, even when an external force toward the inside in the lateral direction Y is applied to the crotch region C from both legs of the wearer H while wearing the garment, the lateral direction Y of the crotch region C can flexibly deform along the body of the wearer H. Therefore, the movement of the wearer's legs is less likely to be hindered by the crotch region C, and a comfortable fit can be maintained even when the cushion layer 7 is provided.

[0028] Furthermore, from the viewpoint of suppressing a decrease in temperature of the outer surface 1b, the absorbent body 4 has a first bonding portion 45 and a second bonding portion . The first bonding portion 45 bonds the top sheet 2 and is discontinuously disposed on the first surface 4a. The second bonding portion 46 bonds the cushion layer 7 and is disposed discontinuously in the first facing region 43 . In the present disclosure, "the bonded portions are arranged discontinuously" means that the bonded portions and the non-bonded portions are arranged alternately on the surface on which the bonded portions are arranged. The first bonded portion 45 and the second bonded portion 46 are made of, for example, an adhesive such as a hot melt adhesive or a pressure sensitive adhesive. In this case, the first bonded portion 45 and the second bonded portion 46 have, for example, a discontinuous coating pattern. Examples of such coating patterns include a stripe shape, a spiral shape, a summit shape, an omega shape, and a curtain shape.

[0029] Furthermore, the proportion of the area of ​​the second bonding portion 46 in the first facing region 43 is lower than the proportion of the area of ​​the first bonding portion 45 in the first surface 4a. By reducing the proportion of the second joint 46 in the first facing region 43 of the second surface 4b, the thermal conductivity between the absorbent body 4 and the cushion layer 7 can be reduced. As a result, even if the absorbent body 4 is cooled by the heat of vaporization, the cushion layer 7 is less likely to be cooled by the absorbent body 4, and the temperature drop of the outer surface 1b of the diaper 1 can be suppressed. On the other hand, by increasing the proportion of the first joint 45 in the first surface 4a, the thermal conductivity between the absorbent body 4 and the top sheet 2 can be increased. As a result, heat due to the body temperature of the wearer is more likely to be conducted to the absorbent body 4 via the top sheet 2. Therefore, the temperature drop of the absorbent body 4 can be suppressed, and the temperature drop of the outer surface 1b caused by the absorbent body 4 can be more effectively suppressed.

[0030] For example, the area ratio of the second bonding portion 46 in the first opposing region 43 to the area ratio of the multiple first bonding portions 45 on the first surface 4a is preferably 5% or more, more preferably 10% or more, and is preferably 80% or less, more preferably 70% or less.

[0031] [Effects of the above configuration] As described above, according to the above-mentioned configuration, even if the evaporation of moisture from the absorbent 4 is promoted by the highly moisture-permeable back sheet 3, a rapid temperature drop in the absorbent 4 can be suppressed, while a temperature drop in the outer surface 1b accompanying the temperature drop can be effectively suppressed. This prevents a caregiver, etc., who is about to change the diaper 1, from feeling the outer surface 1b as cold and mistaking that excrement is leaking when touching the outer surface 1b to check for leakage of excrement. This gives the caregiver, etc. a sense of security that the wearer's clothes are not soiled, and a sense of trust in the diaper 1. Furthermore, the above-mentioned configuration also prevents a decrease in comfort due to the cushion layer 7. Therefore, according to the above-mentioned configuration, a diaper 1 can be provided that achieves both prevention of mistaking that excrement is leaking and improvement of comfort.

[0032] [Example of back sheet and colored part configuration] In the above configuration, the back sheet 3 preferably has a third surface 3a which is the skin side and a fourth surface 3b which is the non-skin side, and further has a colored portion 35 which is arranged on the fourth surface 3b and is colored. The colored portion 35 is formed of a coloring agent such as ink, and is, for example, a portion where applied ink has solidified. The shape of the colored portion 35 is not particularly limited, and may include a pattern, letters, etc. The colored portion 35 can be seen through the exterior body 6, and therefore can provide an impression and information of the product to a caregiver or a wearer.

[0033] The colored portion 35 is formed on a substrate such as a film constituting the back sheet 3, and therefore covers micropores that allow water vapor to pass through. This can partially reduce the moisture permeability of the back sheet 3, and can also suppress the permeation of moisture. Furthermore, the colored portion 35 is preferably hydrophobic, and is preferably formed of, for example, an oil-based ink. This can more effectively suppress the permeation of moisture through the colored portion 35, and can improve the leakproofness of the back sheet 3.

[0034] Furthermore, the third surface 3a has a third facing region 31 facing the cushion layer 7 in the thickness direction Z, and a fourth facing region 32 facing the second facing region 44 of the absorbent body 4 in the thickness direction Z, and it is preferable that at least a part of the colored portion 35 is disposed at a position overlapping with the fourth facing region 32 in the thickness direction Z. "Overlapping in the thickness direction Z" means overlapping in a plan view seen from the thickness direction Z.

[0035] Here, the fourth facing region 32 is not opposed to the cushion layer 7, and therefore water vapor generated from the absorbent body 4 is more likely to pass through it than the third facing region 31. In the above configuration, at least a part of the colored portion 35 is disposed in the fourth facing region 32, so that the permeation of water vapor in the fourth facing region 32 and the associated temperature drop of the absorbent body 4 can be effectively suppressed. Therefore, the temperature drop of the outer surface 1b can be effectively suppressed, and the misconception of the leakage of excrement when touching the outer surface 1b can be more effectively suppressed. Furthermore, the colored portion 35 makes it difficult for the excrement absorbed in the absorbent body 4 to be seen through the outer surface 1b. This makes it possible to suppress the misconception of the leakage of excrement when visually checking the outer surface 1b. In addition, when the colored portion 35 is hydrophobic, the actual leakage of excrement to the outer surface 1b through the colored portion 35 can also be suppressed. Therefore, the above configuration makes it possible to prevent the leakage of excrement from the diaper 1 and the misconception thereof, and more effectively increases the sense of trust and security in the diaper 1 of the caregiver or the like who changes the diaper 1.

[0036] Furthermore, the colored portion 35 may be disposed in a position overlapping with the third facing region 31 in the thickness direction Z, in addition to the fourth facing region 32. In this case, the proportion of the area of ​​the fourth facing region 32 overlapping with the colored portion 35 in the thickness direction Z is preferably higher than the proportion of the area of ​​the third facing region 31 overlapping with the colored portion 35 in the thickness direction Z. This allows the fourth facing region 32, which does not face the cushion layer 7 and is greatly influenced by the absorbent body 4, to be effectively covered by the colored portion 35, thereby improving the effect of preventing the above-mentioned leakage of excrement and misidentification thereof.

[0037] In addition, from the viewpoint of more reliably preventing misidentification of excrement leakage, it is preferable that the colored portion 35 contains a color represented by at least one hue of BG (cyan), B (blue), or BP (purple) in the Munsell color system. Specifically, it is preferable that the colored portion 35 contains a color represented by a hue from 2.5BG through B to 10BP in the Munsell color system. The color represented in this way has a complementary color relationship or a hue close to the hue of urine (e.g., yellow) or feces (e.g., brown). By including a color of a hue completely different from that of urine or feces, the excrement absorbed in the absorbent body 4 becomes even more difficult to see through the outer surface 1b, and misidentification of excrement leakage when the outer surface 1b is visually recognized can be more effectively suppressed. Furthermore, by having a hue completely different from that of excrement, the colored portion 35 becomes less likely to be mistaken for excrement leakage. Therefore, the above-mentioned configuration can more effectively prevent the misidentification of visual leakage of excrement, and can further increase the reliability and security of the diaper 1. The hue on the backsheet 3 can be measured using a commercially available color measuring device (for example, a color difference meter "CR-400" manufactured by Konica Minolta Sensing Inc., a spectrophotometer "CM-700d", etc.).

[0038] [Example of joint configuration] From the viewpoint of effectively controlling the thermal conductivity between the members by the joints, the diaper 1 may further adopt the following configuration. For example, it is preferable that the maximum distance between adjacent second joints 46 is greater than the maximum distance between adjacent first joints 45. This allows a wide space to be provided between the second joints 46, and the heat insulation between the absorbent body 4 and the cushion layer 7 can be further improved. Therefore, a decrease in temperature of the non-skin side outer surface 1b of the cushion layer 7 that accompanies a decrease in temperature of the absorbent body 4 can be effectively suppressed.

[0039] For example, the maximum distance between adjacent second joints 46 is preferably 120% or more, more preferably 140% or more, and preferably 500% or less, more preferably 400% or less, of the maximum distance between adjacent first joints 45.

[0040] (Method of measuring maximum distance between joints) The measurement method will be described using the maximum distance between the second bonding portions 46 as an example. In the region where the second bonding portions 46 are arranged (for example, the first opposing region 43 of the second surface 4b), the distance between adjacent second bonding portions 46 is measured at 10 locations, and the maximum value among the measured values ​​is defined as the "maximum distance between adjacent second bonding portions 46." The maximum distance between the first bonding portions 45 can also be measured in a similar manner.

[0041] In addition, the back sheet 3 preferably has a third bonding portion 33 and a fourth bonding portion . The third bonding portion 33 bonds the cushion layer 7 and is discontinuously disposed in the third facing region 31 . The fourth bonding portion 34 bonds the exterior body 6 and is discontinuously disposed on the fourth surface 3b. The third bonding portion 33 and the fourth bonding portion 34 are preferably made of, for example, an adhesive such as a hot melt adhesive, a pressure sensitive adhesive, or the like, and have the above-mentioned intermittent coating pattern.

[0042] In this case, the ratio of the area occupied by the third joint 33 in the third facing region 31 is preferably higher than the ratio of the area occupied by the fourth joint 34 in the fourth surface 3b. By increasing the ratio of the area occupied by the third joint 33 in the third facing region 31 of the third surface 3a, the cushion layer 7 can be firmly fixed to the back sheet 3, and the cushion layer 7 can be prevented from being displaced or broken. This makes it possible to maintain the heat insulating properties and leakproof properties of the cushion layer 7. In addition, by decreasing the ratio of the area occupied by the fourth joint 34 in the fourth surface 3b, the adhesion between the back sheet 3 and the exterior body 6 can be reduced, and the heat insulating properties between them can be increased. This makes it possible to more reliably suppress the temperature drop of the exterior body 6 accompanying the temperature drop of the absorbent body 4.

[0043] For example, the proportion of the area occupied by the third bonding portion 33 in the third facing region 31 relative to the proportion of the area occupied by the fourth bonding portion 34 on the fourth surface 3b is preferably 110% or more, more preferably 120% or more, and is preferably 300% or less, more preferably 400% or less.

[0044] Moreover, it is preferable that the maximum distance between adjacent third joints 33 is smaller than the maximum distance between adjacent fourth joints 34. This makes it possible to ensure a wide space between adjacent fourth joints 34, and more effectively improve the heat insulation between the backsheet 3 and the exterior body 6. Therefore, the temperature drop of the exterior body 6 accompanying the temperature drop of the absorbent body 4 can be more reliably suppressed.

[0045] For example, the maximum distance between adjacent third joints 33 is preferably 15% or more, more preferably 25% or more, and preferably 90% or less, more preferably 80% or less, of the maximum distance between adjacent fourth joints 34.

[0046] [Example of cushion layer configuration] From the viewpoint of ensuring sufficient thermal insulation, the cushion layer 7 preferably has a high basis weight. For example, the basis weight of the cushion layer 7 is preferably higher than that of the core wrap sheet 41. The basis weight of the cushion layer 7 is also preferably higher than that of the top sheet 2. Specifically, from the viewpoint of ensuring sufficient thermal insulation, the basis weight of the cushion layer 7 is preferably 20 g / cm. 2 More preferably, 25 g / cm 2 From the viewpoint of suppressing an increase in stiffness and maintaining a good wearing comfort, it is preferably 50 g / cm 2 Less than 40g / cm 2 The following is the result.

[0047] (Method of measuring basis weight) The member to be measured is cut with a single-edged razor to obtain test pieces with a predetermined area. The weight of the test pieces is measured using an electronic balance (e.g., electronic balance GR-300 manufactured by A&D Co., Ltd., accuracy: four decimal places). The weight thus obtained is divided by the area of ​​the test piece of each part to calculate the basis weight of the test piece. The basis weight is the average of the basis weights of the five test pieces for each part.

[0048] From the viewpoint of ensuring sufficient heat insulation, the thickness of the cushion layer 7 is preferably 1.5 mm or more, more preferably 2 mm or more, and is preferably 7 mm or less, more preferably 6 mm or less.

[0049] (Thickness measurement method) As in the method for measuring basis weight, a test piece is obtained from the object to be measured. The test piece is pressurized at a pressure of 5 kPa for 10 minutes, and the measurement is performed immediately after removing the weight. An acrylic plate with a size of 20 mm x 20 mm and a thickness of 3 mm is placed in the central region of the sample after removing the weight, and the thickness of the test piece is measured using a non-contact laser displacement meter (for example, laser head LK-G30 and displacement meter LK-GD500 manufactured by Keyence Corporation). If the size of the cut-out test piece is small and it is difficult to measure using a non-contact laser displacement meter, the cross section of the test piece may be observed and measured at a magnification of 20 to 100 times using, for example, a microscope (VHX-1000 manufactured by Keyence Corporation).

[0050] Furthermore, the cushion layer 7 preferably contains hydrophobic fibers, and more preferably is mainly composed of hydrophobic fibers. The ratio of hydrophobic fibers to the total fibers constituting the cushion layer 7 is preferably 50% by mass or more, more preferably 60% by mass or more, and may be 100% by mass. By including hydrophobic fibers in the cushion layer 7, the cushion layer 7 becomes less likely to transmit moisture to the outer surface 1b side, and leakage of excrement and misidentification thereof can be more reliably suppressed.

[0051] As the hydrophobic fiber, a hydrophobic synthetic fiber, particularly a hydrophobic thermoplastic fiber, can be used. Examples of the material of the thermoplastic fiber include polyolefins such as polyethylene (PE) and polypropylene (PP), polyesters such as polyethylene terephthalate (PET), polyamides such as nylon 6 and nylon 66, polyacrylic acid, polymethacrylic acid alkyl esters, polyvinyl chloride, polyvinylidene chloride, etc., and these can be used alone or in combination of two or more.

[0052] In addition, the cushion layer 7 is preferably made of a nonwoven fabric that is bulkier than the top sheet 2, from the viewpoint of containing sufficient air between the fibers and having a high thermal insulation property. The term "bulky nonwoven fabric" refers to a nonwoven fabric that has many spaces (areas where nonwoven fabric constituent materials such as fibers are not present) defined by the constituent fibers of the nonwoven fabric, and has a large ratio of the spaces to the total volume of the nonwoven fabric (space occupancy rate). The term "nonwoven fabric that is bulkier than the top sheet 2" refers to a nonwoven fabric that has a lower apparent density than the top sheet 2. Specific examples of bulky nonwoven fabrics include nonwoven fabrics that have a fiber diameter larger than that of the top sheet 2, and nonwoven fabrics manufactured by a manufacturing method that easily forms spaces between fibers, such as air-through nonwoven fabrics, resin-bonded nonwoven fabrics, and air-laid nonwoven fabrics.

[0053] (Method of measuring apparent density) 4cm from the material to be measured 2 A portion within the range is cut to obtain a test piece. The cut surface of the test piece is observed under no load using a microscope (VHX-100 manufactured by Keyence Corporation) at a magnification of 20 to 100 times, and the apparent thickness of each member is measured. Next, the basis weight of the test piece is measured as described above, and the basis weight is divided by the measured apparent thickness to measure the apparent density. The average apparent density of the five test pieces for each member is calculated and used as the apparent density of each member.

[0054] [Example of thickness configuration of the skin side and non-skin side of absorbent material] As shown in Fig. 3, in the diaper 1, it is preferable that the thickness D1 from the first surface 4a of the absorbent body 4 to the skin-side surface 1a formed by the top sheet 2 is thinner than the thickness D2 from the second surface 4b of the absorbent body 4 to the outer surface 1b formed by the exterior body 6. The thicknesses D1 and D2 can be measured by cutting out a test piece including the absorbent body 4 from the entire diaper 1 and observing the cross section of the test piece under the microscope at a magnification of 20 to 100 times. The thickness D2 is the thickness of the portion including the cushion layer 7.

[0055] Because the thickness D1 from the first surface 4a to the skin-side surface 1a is small, heat from the wearer's body temperature is easily conducted to the absorbent body 4 via the top sheet 2, and a drop in temperature of the absorbent body 4 can be suppressed. In addition, because the thickness from the second surface 4b to the outer surface 1b is large, the thermal conductivity between the second surface 4b and the outer surface 1b is reduced, and a drop in temperature of the outer surface 1b due to a drop in temperature of the absorbent body 4 can be suppressed. This prevents a caregiver or the like from mistakingly identifying a leak of excrement when touching the outer surface 1b.

[0056] The thickness D1 from the first surface 4a to the skin side surface 1a is preferably 15% or more, more preferably 20% or more, and preferably 90% or less, more preferably 80% or less, of the thickness D2 from the second surface 4b to the outer surface 1b.

[0057] [Top sheet configuration example] From the viewpoint of enhancing thermal conductivity, the top sheet 2 preferably has a plurality of openings. The openings may be formed at the bottoms of recesses in accordance with the unevenness of the top sheet 2, or may be formed on a substantially flat surface. Such openings allow heat from the wearer's body temperature to be easily conducted to the absorbent body 4 via the openings, and a decrease in temperature of the absorbent body 4 can be more effectively suppressed.

[0058] [Back sheet configuration example] The back sheet 3 is preferably composed of a moisture-permeable film having a plurality of micropores (microvoids). The moisture-permeable film is composed of, for example, a resin film, and has a single-layer structure or a laminated structure. The moisture-permeable film is 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 uniaxially or biaxially stretching the film. For example, the inflation method, the T-die method, etc. can be used to form the film. In the moisture-permeable film thus manufactured, a large number of micropores are formed starting from the interface between the thermoplastic resin and the inorganic fine particles by stretching.

[0059] 5(A) and (B), in the moisture-permeable film 30, a force is applied to inorganic fine particles 36 such as calcium carbonate particles along the stretching direction E during stretching, and the inorganic fine particles 36 are dragged in the stretching direction E to form micropores 37. Therefore, the backsheet 3 formed of the moisture-permeable film 30 includes inorganic fine particles 36 and micropores 37 adjacent to the inorganic fine particles 36.

[0060] In the back sheet 3, for example, it is preferable that the pore volume per unit mass of the micropores 37 having a pore diameter in the range of 0.06 μm to 0.16 μm is larger than the pore volume per unit mass of the micropores 37 having a pore diameter in the range of 2.5 μm to 3.5 μm. This allows a large number of micropores 37 having small pore diameters 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 37 having a pore 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 having both moisture permeability and leakproofness can be obtained.

[0061] (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 back sheet 3 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."

[0062] 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. 5(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.

[0063] In contrast, as shown in Fig. 5(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. 5(A) becomes a sufficiently opened micropore 37 (portion shown by a thick line) in Fig. 5(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.

[0064] As an index of whether the moisture-permeable film 30 is uniformly stretched, the back sheet 3 has a stretch width 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 37 arranged adjacent to the inorganic fine particles 36 having a size of 1.0 μm or less is 1.0 μm. 2 More than 1.5μm 2 It is preferable that the diameter of the micropores 37 is smaller than the diameter of the micropores 37 arranged adjacent to the inorganic fine particles 36 having a size of 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 a backsheet 3 with high moisture permeability and leakproofness can be obtained.

[0065] (Method of measuring size of inorganic fine particles and pore diameter of fine pores) An evaluation sample of a given size (for example, 10 mm x 10 mm) is cut out from the back sheet 3. The cut evaluation sample is fixed in place in the usual way 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 from one back sheet 3 are captured and the images are then analyzed to obtain an image with a resolution 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.

[0066] 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 back sheet 3, the pore diameter of the micropores 37 is controlled within 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 backsheet 3 that satisfies both moisture permeability and leak prevention properties can be obtained.

[0067] Moreover, it is preferable that the back sheet 3 is uniformly stretched as described above so as to be thin while maintaining leakproofness. From this viewpoint, the basis weight of the back sheet 3 is preferably 8 g / cm 2 More preferably, 10 g / cm 2 More preferably, it is 20 g / cm 2 Less than 18g / cm 2 The following is the result.

[0068] The moisture permeability of the back sheet 3 is preferably 2.7 g / 100 cm 2 h or more, preferably 3 g / 100 cm 2 h or more, preferably 12 g / 100 cm 2 h or less, preferably 10 g / 100 cm 2This allows the back sheet 3 to have sufficiently high moisture permeability, making it possible to provide a comfortable diaper 1 with less stuffiness, while also ensuring the leakproofness of the back sheet 3.

[0069] (Method of measuring moisture permeability) 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. A 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.

[0070] [Example of exterior body configuration] As shown in Fig. 7, the exterior body 6 may have a laminated structure of multiple sheet materials 60. In the example shown in Fig. 7, the exterior body 6 has two sheet materials 60a, 60b. Each of the sheet materials 60a, 60b is made of, for example, a nonwoven fabric, and more preferably contains the above-mentioned hydrophobic fiber as a main component. Examples of the nonwoven fabric constituting each sheet material 60 include air-through nonwoven fabric, spunbond nonwoven fabric, and spunbond-meltblown-spunbond (SMS) nonwoven fabric, and the like, and one type of these may be used alone or two or more types may be used in combination.

[0071] In particular, among the multiple sheet materials 60a, 60b, the outermost sheet material 60a constituting the outer surface 1b is preferably composed of an air-through nonwoven fabric. Air-through nonwoven fabric is easily formed between fibers because hot air is blown onto a fiber web to fuse the fibers. For this reason, the sheet material 60 using the air-through nonwoven fabric is easily prone to contain air inside, and thermal conductivity is easily reduced. Therefore, by using the air-through nonwoven fabric as the outermost sheet material 60 that is touched by a caregiver, etc., the temperature drop of the outer surface 1b accompanying the temperature drop of the absorbent body 4 can be effectively suppressed.

[0072] Furthermore, it is preferable that the exterior body 6 further includes a fifth joint 63 that joins adjacent sheet materials 60a, 60b in the thickness direction Z among the multiple sheet materials 60. This fixes the adjacent sheet materials 60a, 60b, making it possible to prevent the exterior body 6 from being torn and also makes it easy to fix an elastic member (leg elastic member 62 in the example of FIG. 7) between the sheet materials 60a, 60b.

[0073] For example, it is preferable that the fifth joint portion 63 is arranged discontinuously between the adjacent sheet materials 60a, 60b. This allows the fifth joint portion 63 to be arranged alternately with the non-joint portion, thereby reducing the thermal conductivity between the adjacent sheet materials 60 and suppressing a temperature drop in the outermost sheet material 60a that accompanies a temperature drop in the cushion layer 7 and the back sheet 3. This makes it possible to more effectively prevent a temperature drop in the outer surface 1b and suppress misidentification of excrement leakage.

[0074] [Other embodiments] Although an embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and scope of the present invention.

[0075] In the above embodiment, an example has been described in which one exterior body 6 is formed continuously across the abdominal region A, the dorsal region B, and the crotch region C, but this is not limiting. For example, the exterior body 6 may have a configuration in which the abdominal region A, the dorsal region B, and the crotch region C are separated.

[0076] The absorbent article according to the present invention may be any absorbent article having an exterior body, and may be, in addition to pants-type disposable diapers, flat-type disposable diapers, sanitary articles (for example, pants-type sanitary napkins), and the like. [Explanation of symbols]

[0077] 1...Absorbent articles (disposable diapers) 2. Top sheet 3. Back seat 4…Absorbent 4a...Side 1 4b…Second side 6…Exterior body 7…Cushion layer 43...First opposing area 44…Second opposing area 45...1st joint 46…Second joint part

Claims

1. An absorbent article comprising a liquid-permeable top sheet, a moisture-permeable back sheet, an absorbent body disposed between the top sheet and the back sheet, and an exterior body disposed on the non-skin side of the back sheet, the absorbent article having a vertical direction extending from the wearer's abdominal side through a crotch region to the back 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, The mattress further includes a hydrophobic cushion layer disposed between the absorbent body and the backsheet and facing the lateral center portion of the absorbent body, The absorbent body is The first side is the skin side, a second surface that is a non-skin side; The second surface is a first opposing region opposing the cushion layer in the thickness direction; a second opposing region located laterally outside the first opposing region and opposing the back sheet in the thickness direction without the cushion layer therebetween; The absorbent body further comprises: A first joining portion that joins the top sheet and is discontinuously arranged on the first surface; a second bonding portion that bonds the cushion layer and is discontinuously disposed in the first opposing region, The proportion of the area occupied by the second bonding portion in the first opposing region is lower than the proportion of the area occupied by the first bonding portion in the first surface. Absorbent articles.

2. The back sheet is The third side is the skin side, a fourth surface which is the non-skin side; a colored portion disposed on the fourth surface and colored; The third surface is a third opposing region opposing the cushion layer in the thickness direction; a fourth opposing region facing the second opposing region of the absorbent body in the thickness direction; At least a part of the colored portion is disposed at a position overlapping the fourth opposing region in the thickness direction. The absorbent article of claim 1.

3. The proportion of the area of ​​the fourth opposing region that overlaps with the colored portion in the thickness direction is higher than the proportion of the area of ​​the third opposing region that overlaps with the colored portion in the thickness direction. The absorbent article of claim 2.

4. The colored portion includes a color represented by at least one hue of BG (cyan), B (blue), or BP (purple) in the Munsell color system. The absorbent article according to claim 2 or 3.

5. The maximum distance between adjacent second joints is greater than the maximum distance between adjacent first joints. The absorbent article according to claim 1 or 2.

6. The back sheet is The third side is the skin side, a fourth surface that is a non-skin side; The third surface is a third opposing region opposing the cushion layer in the thickness direction, The backsheet further comprises: a third bonding portion that bonds the cushion layer and is discontinuously disposed in the third opposing region; a fourth bonding portion that bonds the exterior body and is discontinuously disposed on the fourth surface, The proportion of the area occupied by the third bonding portion in the third opposing region is higher than the proportion of the area occupied by the fourth bonding portion in the fourth surface. The absorbent article according to claim 1 or 2.

7. The maximum distance between adjacent third joints is smaller than the maximum distance between adjacent fourth joints. The absorbent article of claim 6.

8. The absorbent body is an absorbent core; a core wrap sheet that covers the absorbent core and constitutes at least the second surface, The basis weight of the cushion layer is greater than the basis weight of the core wrap sheet on the second surface. The absorbent article according to claim 1 or 2.

9. The basis weight of the cushion layer is 20 g / cm ２ That's all The absorbent article according to claim 1 or 2.

10. In the absorbent article, The thickness from the first surface of the absorbent body to the skin-facing surface formed by the top sheet is thinner than the thickness from the second surface of the absorbent body to the outer surface formed by the exterior body. The absorbent article according to claim 1 or 2.

11. The backsheet is made of a moisture-permeable film having a plurality of micropores. The absorbent article according to claim 1 or 2.

12. The moisture permeability of the back sheet is 2.7 g / 100 cm ２ ・H or more 12g / 100cm ２ ・It is less than h The absorbent article of claim 11.

13. In the back sheet, The pore volume per unit mass of the micropores having a pore 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 the micropores having a pore diameter in the range of 2.5 μm or more and 3.5 μm or less. The absorbent article of claim 11.

14. the backsheet has inorganic fine 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 pore diameter of the micropores arranged adjacent to the inorganic fine particles having a size of 1.0 μm or less ２ More than 1.5 μm ２ The pore size of the micropores arranged adjacent to the inorganic fine particles is smaller than the pore size of the micropores arranged adjacent to the inorganic fine particles. The absorbent article of claim 11.

15. 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 inorganic fine 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 inorganic fine particles having a size of less than 1000 nm is less than that of the inorganic fine particles having a size of less than 1000 nm, and 2.0 μm ２ The number of particles per unit area of ​​the inorganic fine particles is 0.5 μm ２ 2.0 μm or more ２ The number of particles per unit area of ​​the inorganic fine particles having a size of less than 15. The absorbent article of claim 14.

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