Absorber and absorbent article

Abstract

To provide an absorber which effectively reduces stuffiness in wearing and an absorbent article.SOLUTION: An absorber 23 includes a lengthwise direction X corresponding to a front-back direction of a wearer and a perpendicular direction Y perpendicular to the length wise direction X, and includes end part regions R1, R2 respectively positioned in both end parts in the lengthwise direction X and a central absorbent region R3 sandwiched between a pair of the end part regions R1, R2. At least one of the pair of the end part regions R1, R2 includes a moisture absorbing region R4 where a moisture absorbing member 4 is arranged. In the moisture absorbing region R4, the moisture absorbing member 4 is positioned between two sheets 41, 41. In the moisture absorbing member 4, at least a part of the moisture absorbing member 4 is the moisture absorbing member 4 adjacent to one 41 of the two sheets 41, 41. The absorber 23 includes a fixed moisture absorbing member 4q fixed to the sheet 41 and an unfixed moisture absorbing member 4b in which at least one of a skin facing surface side and a non-skin facing surface side is not fixed to the sheet 41 as the adjacent moisture absorbing member 4.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an absorbent body and an absorbent article. [Background technology]

[0002] Conventionally, an absorbent body and an absorbent article including the absorbent body are known. For example, Patent Document 1 describes an absorbent article having a front waist edge and a rear waist edge. The document describes that a moisture-reactive member capable of absorbing water vapor is disposed near the front waist edge and the rear waist edge, and that the moisture-reactive member includes a superabsorbent material located inside a liquid-permeable sheath. Patent Document 2 describes that the absorbent body is made of a base material and a highly absorbent resin, and that a high-density layer of a highly absorbent resin is formed on both ends of the absorbent body in the longitudinal direction and / or width direction so as to surround the periphery of the absorbent body. Patent Document 3 describes an absorbent sheet including two fiber sheets and a water-absorbing polymer disposed between the fiber sheets. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special table 2008-500149 publication [Patent Document 2] JP 2015-27342 A [Patent Document 3] International Publication No. 2021 / 132338 Summary of the Invention [Problem to be solved by the invention]

[0004] When a moisture-absorbing member such as a superabsorbent material, a high-density layer of a highly absorbent resin, or a water-absorbent polymer is completely fixed to a member adjacent to the moisture-absorbing member, the moisture-absorbing member may be prevented from expanding sufficiently, and the moisture-absorbing performance of the moisture-absorbing member may not be fully exhibited. In Patent Documents 1 to 3, sufficient consideration has not been given to fully exhibiting the moisture-absorbing performance of the moisture-absorbing member, and there is room for improvement in reducing stuffiness when the absorbent article is worn. Therefore, an object of the present invention is to provide an absorbent body and an absorbent article that can reduce stuffiness when worn. [Means for solving the problem]

[0005] The present invention relates to an absorbent body having a longitudinal direction corresponding to the front-to-back direction of a wearer and a lateral direction perpendicular to the longitudinal direction. In one embodiment, it is preferable that the absorbent material has end regions located at both ends in the longitudinal direction, and a central absorbent region sandwiched between the pair of end regions. In one embodiment, it is preferable that a moisture absorbing region having a moisture absorbing member is provided in at least one of the pair of end regions. In one embodiment, in the moisture absorbing region, the moisture absorbing member is preferably located between two sheets. In one embodiment, it is preferable that at least a portion of the moisture-absorbing member is adjacent to one of the two sheets. In one embodiment, it is preferable that the adjacent moisture-absorbing member comprises a fixed moisture-absorbing member fixed to the sheet and a non-fixed moisture-absorbing member having at least one of the skin-facing side and non-skin-facing side not fixed to the sheet.

[0006] The present invention also relates to an absorbent article comprising an absorbent main body having an absorbent layer, and an exterior body disposed on the non-skin-facing side of the absorbent main body. In one embodiment, the absorbent body of the absorbent article is preferably the absorbent body of the present invention described above. Effect of the Invention

[0007] According to the present invention, it is possible to provide an absorbent body and an absorbent article that can effectively reduce stuffiness when worn. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view that illustrates a pants-type disposable diaper as one embodiment of the absorbent article of the present invention. [Diagram 2] FIG. 2 is a plan view diagrammatically illustrating the diaper shown in FIG. 1 in an unfolded and extended state. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] 4(a) and (b) are diagrams for explaining how the moisture absorbent member absorbs moisture and swells. [Diagram 5] FIG. 5 is a cross-sectional view that illustrates a schematic view of another embodiment of the absorbent article of the present invention, and corresponds to FIG. [Figure 6] 6(a) and (b) are schematic plan views for explaining a method for manufacturing the absorbent body related to the absorbent article shown in FIG. [Figure 7] 7(a) to 7(d) are plan views showing modified examples of adhesive application patterns in the moisture absorptive region of the absorbent article shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The present invention will now be described based on its preferred embodiments. FIG. 1 shows a pants-type disposable diaper (hereinafter referred to as "diaper") 1 having an absorbent body 23 which is a first embodiment of the absorbent body of the present invention. The diaper 1 is a first embodiment of the absorbent article of the present invention. As shown in FIGS. 1 to 3, the diaper 1 has a ventral side portion A which is arranged on the ventral side of a wearer when worn, a dorsal side portion B which is arranged on the dorsal side of the wearer, and a crotch portion C which is located between the ventral side portion A and the dorsal side portion B. The diaper 1 also has a longitudinal direction X and a lateral direction Y which is perpendicular to the longitudinal direction X. The longitudinal direction X is a direction which passes through the crotch portion C and corresponds to the front-to-rear direction of the wearer.

[0010] 1 to 3, the diaper 1 comprises an absorbent main body 2 having an absorbent body 23, and an exterior body arranged on the non-skin-facing side of the absorbent main body 2. The exterior body includes a ventral-side exterior body 3A arranged on the ventral-side portion A, and a rear-side exterior body 3B arranged on the rear-side portion B. The diaper 1 has both side portions 3e, 3e extending along the longitudinal direction X of the ventral-side exterior body 3A and both side portions 3f, 3f extending along the longitudinal direction X of the rear-side exterior body 3B joined together to form a pair of side seal portions S, S, a waist opening WH, and a pair of leg openings LH, LH.

[0011] As shown in FIG. 2, the absorbent body 2 has an absorbent body 23, a top sheet 21 arranged on the skin-facing side of the absorbent body 23, and a back sheet 22 arranged on the non-skin-facing side of the absorbent body 23. The absorbent body 23 has a shape that is elongated in the longitudinal direction X of the diaper 1, similar to the absorbent main body 2, and is disposed between the top sheet 21 and the back sheet 22.

[0012] As described above, the exterior body includes a ventral exterior body 3A and a rear exterior body 3B. In this embodiment, each of the ventral exterior body 3A and the rear exterior body 3B has an outer layer sheet 32 ​​forming the outer surface of the diaper 1 and an inner layer sheet 31 disposed on the skin-facing side of the outer layer sheet 32.

[0013] In the ventral exterior body 3A, a plurality of elastic members 33 are arranged between the outer layer sheet 32 ​​and the inner layer sheet 31 in a stretched state along the lateral direction Y. In the region overlapping with the absorbent main body 2, the elastic members 33 may be arranged so as not to exhibit elastic stretchability by being subjected to processing such as fine division. In this embodiment, the back exterior body 3B has a similar configuration to the ventral exterior body 3A. The explanation of the ventral exterior body 3A also applies to the back exterior body 3B.

[0014] As shown in Fig. 2, the absorbent body 23 has end regions R1, R2 located at both ends in the longitudinal direction X, and a central absorbent region R3 sandwiched between the pair of end regions R1, R2. In the absorbent body of the present invention, a moisture-absorbent region R4 having a moisture-absorbent member 4 is arranged in at least one of the pair of end regions R1, R2. In the absorbent body 23 of this embodiment, the moisture-absorbent region R4 is arranged in both of the pair of end regions R1, R2. Note that the moisture-absorbent region R4 may be arranged in only one of the pair of end regions R1, R2. In this embodiment, the central absorbent region R3 includes an absorbent core 23a which is a mixed laminate of absorbent fibers and superabsorbent polymers. As the absorbent fibers, for example, natural fibers such as wood pulp, and hydrophilic fibers such as hydrophilic synthetic fibers can be used. As the superabsorbent polymer, any of those conventionally used in this type of absorbent body can be used without any particular restriction, for example, a polymer or copolymer of acrylic acid or an alkali metal salt of acrylic acid can be used.

[0015] The moisture-absorbing region R4 is a region capable of absorbing moisture. In this embodiment, a highly absorbent polymer is used as the moisture-absorbing member 4. By using a highly absorbent polymer as the moisture-absorbing member 4, it is possible to improve the moisture absorption efficiency in the moisture-absorbing region R4. As described above, the moisture-absorbing region R4 is disposed in the end regions R1, R2 of the absorbent body 23. Therefore, when the diaper 1 or the absorbent body 23 is worn, the moisture-absorbing region R4 is disposed in a position corresponding to the waist part on the ventral or dorsal side of the wearer. This allows the moisture-absorbing region R4 to absorb moisture generated near the waist part when the diaper 1 or the absorbent body 23 is worn.

[0016] In the moisture absorbing region R4, the moisture absorbing member 4 is located between the two sheets 41, 41. At least a part of the moisture absorbing member 4 is adjacent to one of the two sheets 41, 41. In this embodiment, the absorbent body 23 has the moisture absorbing member 4 and the absorbent core 23a as described above, and both the skin-facing surface and the non-skin-facing surface of the moisture absorbing member 4 and the absorbent core 23a are covered by one core wrap sheet 23b. Therefore, the two sheets 41, 41 are a part of the core wrap sheet 23b located on the skin-facing surface side of the absorbent body 23 and a part of the core wrap sheet 23b located on the non-skin-facing surface side of the absorbent body 23. For example, a thin paper made of hydrophilic fibers or a nonwoven fabric having liquid permeability can be used as the core wrap sheet 23b.

[0017] In this embodiment, as shown in FIG. 4(a), the moisture-absorbing member 4 adjacent to the sheet 41 includes a fixed moisture-absorbing member 4a fixed to the sheet 41 and a non-fixed moisture-absorbing member 4b not fixed to the sheet 41 on at least one of the skin-facing side or the non-skin-facing side. In this embodiment, the fixed moisture-absorbing member 4a is fixed to the sheet 41 via a fixing member 42. The fixing member 42 will be described later. The non-fixed moisture-absorbing member 4b is not fixed to at least one of the sheet 41 located closer to the skin than the non-fixed moisture-absorbing member 4b and the sheet 41 located closer to the non-skin-facing side than the non-fixed moisture-absorbing member 4b. In other words, the fixing member 42 is not disposed at least one between the non-fixed moisture-absorbing member 4b and the sheet 41 located closer to the skin than the non-fixed moisture-absorbing member 4b, and between the non-fixed moisture-absorbing member 4b and the sheet 41 located closer to the non-skin-facing side than the non-fixed moisture-absorbing member 4b. The advantage of including a fixed moisture absorbent member 4a and a non-fixed moisture absorbent member 4b as the moisture absorbent member 4 adjacent to one sheet is as follows.

[0018] From the viewpoint of preventing the moisture absorbent member 4 from unintentionally moving or being unevenly distributed, it is preferable that the moisture absorbent member 4 adjacent to the sheet 41 is a fixed moisture absorbent member 4a. However, since the fixed moisture absorbent member 4a is fixed to the sheet 41, the moisture absorption effect is reduced. Specifically, the fixed member 42 covers the surface of the fixed moisture absorbent member 4a that is fixed to the sheet 41, and the fixed member 42 becomes a barrier between the fixed moisture absorbent member 4a and moisture, and the fixed moisture absorbent member 4a cannot directly absorb moisture. In addition, since the fixed moisture absorbent member 4a is fixed to the sheet 41, it is not possible to secure a sufficient space for the fixed moisture absorbent member 4a to change in volume (expand) after absorbing moisture. Due to these two factors, the moisture absorption effect of the fixed moisture absorbent member 4a is reduced, and there is a risk that the moisture absorption performance cannot be fully exhibited. In contrast, the non-fixed moisture absorbent member 4b is not easily affected by the above two factors because at least one of the skin-facing side and the non-skin-facing side of the non-fixed moisture absorbent member 4b is not fixed to the sheet. In other words, when the non-fixed moisture absorbent member 4b absorbs moisture, the non-fixed moisture absorbent member 4b can expand sufficiently (see FIG. 4(b)), and is likely to fully exhibit moisture absorption performance. In addition, since the fixed member 42 is not disposed on at least one of the skin-facing side and the non-skin-facing side of the non-fixed moisture absorbent member 4b, at least one of the skin-facing side and the non-skin-facing side of the non-fixed moisture absorbent member 4b is not covered with the fixed member 42. Therefore, the fixed member 42 is not likely to be a barrier between the non-fixed moisture absorbent member 4b and moisture, and the non-fixed moisture absorbent member 4b is likely to exhibit a moisture absorbing effect. It is possible that only one of the skin-facing surface and the non-skin-facing surface of the non-fixed moisture-absorbent member 4b is not fixed to the sheet, but from the viewpoint of enabling the non-fixed moisture-absorbent member 4b to more fully exhibit its moisture absorption performance, it is preferable that both the skin-facing surface and the non-skin-facing surface of the non-fixed moisture-absorbent member 4b are not fixed to the sheet.

[0019] If all of the moisture absorbent members 4 adjacent to one sheet were fixed moisture absorbent members 4a, there would be a risk that the moisture absorbent region R4 would not be able to fully exhibit its moisture absorbent performance, but by including the fixed moisture absorbent member 4a and the non-fixed moisture absorbent member 4b as the moisture absorbent member 4 adjacent to one sheet, the moisture absorbent region R4 can fully exhibit its moisture absorbent performance. Therefore, by including the fixed moisture absorbent member 4a and the non-fixed moisture absorbent member 4b as the moisture absorbent member 4 adjacent to one sheet, it is possible to effectively reduce stuffiness during wear.

[0020] As the fixing member 42, any material that has been conventionally used in this type of absorbent body can be used without any particular limitation, and it is preferable to use, for example, a hot melt adhesive.

[0021] In the moisture absorbing region R4, the ratio of the fixed moisture absorbing members 4a and the non-fixed moisture absorbing members 4b among the moisture absorbing members 4 adjacent to one of the sheets may be the same or different. When the ratio of the fixed moisture absorbing members 4a and the non-fixed moisture absorbing members 4b is different, it is preferable that the ratio of the non-fixed moisture absorbing members 4b is higher than the ratio of the fixed moisture absorbing members 4a, from the viewpoint of effectively reducing stuffiness during wearing.

[0022] Specifically, the proportion of the non-fixed moisture absorbent member 4b is preferably 30% or more, more preferably 45% or more, and even more preferably 60% or more, from the viewpoint of effectively reducing stuffiness during wearing. Also, the proportion of the non-fixed moisture absorbent member 4b is preferably 90% or less, more preferably 85% or less, and even more preferably 80% or less, from the viewpoint of preventing unintentional movement or uneven distribution of the moisture absorbent member 4. From the viewpoint of achieving both of these, the proportion of the non-fixed moisture absorbent member 4b is preferably 30% or more and 90% or less, more preferably 45% or more and 85% or less, and even more preferably 60% or more and 80% or less.

[0023] The ratio of the fixed moisture absorbent members 4a and the non-fixed moisture absorbent members 4b to the moisture absorbent members 4 adjacent to one of the sheets can be measured by the following method. <Method of measuring the ratio of fixed moisture absorbent member 4a and non-fixed moisture absorbent member 4b> The area of ​​moisture absorbent region R4 when viewed from one of the sheets in plan view is defined as S0. The area of ​​the portion where the sheet adjacent to the moisture absorbent member 4 and the fixing member 42 that fixes the moisture absorbent member 4 overlap with the moisture absorbent member 4 is defined as S1. The value obtained by dividing the area S1 by the area S0 and multiplying this value by 100 is defined as the proportion of the fixed moisture absorbent member 4a. The area of ​​the portion of the moisture absorbent member 4 that does not overlap with the fixed member 42 is defined as S2. The area S2 is divided by the area S0 and multiplied by 100 to determine the proportion of the non-fixed moisture absorbent member 4b. The areas S1 and S2 can be calculated, for example, by using known image analysis software.

[0024] In this embodiment, the moisture absorbent member 4 adjacent to each of the two sheets 41, 41 sandwiching the moisture absorbent member 4 may include a fixed moisture absorbent member 4a and a non-fixed moisture absorbent member 4b. In this case, the ratio of the non-fixed moisture absorbent member 4b may be the same or different between the moisture absorbent member 4 adjacent to one sheet 41 and the moisture absorbent member 4 adjacent to the other sheet 41. When the ratio of the non-fixed moisture absorbent member 4b is different between the moisture absorbent member 4 adjacent to one sheet 41 and the moisture absorbent member 4 adjacent to the other sheet 41, it is preferable that the ratio of the non-fixed moisture absorbent member 4b in the moisture absorbent member 4 adjacent to the sheet 41 on the non-skin facing side is higher than the ratio of the non-fixed moisture absorbent member 4b in the moisture absorbent member 4 adjacent to the sheet 41 on the skin facing side. In other words, it is preferable that the non-fixed moisture absorbent member 4b is present more on the skin facing side of the absorbent body 23 than on the non-skin facing side of the absorbent body 23. When the diaper 1 is worn, moisture is typically generated from the wearer's sweat, etc., and by having a large amount of non-fixed moisture-absorbing members 4b on the skin-facing side of the absorbent body 23, the moisture can be absorbed more efficiently and stuffiness can be prevented more effectively.

[0025] In this embodiment, as described above, the moisture-absorbing member 4 is a highly absorbent polymer, and the absorbent core 23a is a mixed stack of absorbent fibers and highly absorbent polymers. Therefore, both the moisture-absorbing region R4 and the central absorbent region R3 contain highly absorbent polymers, which are the moisture-absorbing member 4. The basis weight of the moisture-absorbing member 4 in the central absorbent region R3 is preferably equal to or less than the basis weight of the moisture-absorbing member 4 in the moisture-absorbing region R4. By adjusting the basis weight relationship between the central absorbent region R3 and the moisture-absorbing region R4 in this way, it becomes easier to make the thickness T4 of the absorbent body 23 in the moisture-absorbing region R4 thinner than the thickness T3 of the absorbent body 23 in the central absorbent region R3. Since the thickness T4 of the absorbent body 23 in the moisture-absorbing region R4 is relatively thin, it is possible to prevent the wearer from feeling discomfort around the waist when wearing the garment. It is also possible to improve the fit.

[0026] The ratio of the basis weight of the moisture absorbent member 4 in the central absorbent region R3 to the basis weight of the moisture absorbent member 4 in the moisture absorbent region R4 is preferably 1.0 or less, more preferably 0.75 or less, and even more preferably 0.50 or less, from the viewpoint of reducing discomfort and improving fit. Furthermore, the ratio of the basis weight of the moisture absorbent member 4 in the central absorbent region R3 to the basis weight of the moisture absorbent member 4 in the moisture absorbent region R4 is preferably 0.1 or more, more preferably 0.2 or more, and even more preferably 0.3 or more, from the viewpoint of fully exerting the moisture absorbing effect. Furthermore, the ratio of the basis weight of the moisture absorbent member 4 in the central absorbent region R3 to the basis weight of the moisture absorbent member 4 in the moisture absorbent region R4 is preferably 0.1 or more and 1.0 or less, more preferably 0.2 or more and 0.75 or less, and even more preferably 0.3 or more and 0.50 or less, from the viewpoint of achieving both of these.

[0027] As described above, the moisture-absorbing region R4 is preferably thinner than the central absorbent region R3. Specifically, the ratio T4 / T3 of the thickness T4 of the moisture-absorbing region R4 to the thickness T3 of the central absorbent region R3 is greater than 0 from the viewpoint of the thickness of the members constituting the moisture-absorbing region. Moreover, from the viewpoint of reducing discomfort and improving fit, the ratio T4 / T3 is preferably 1 / 2 or less, more preferably 1 / 3 or less, and even more preferably 1 / 4 or less. Moreover, from the viewpoint of achieving both, the ratio T4 / T3 is preferably more than 0 and 1 / 2 or less, more preferably more than 0 and 1 / 3 or less, and even more preferably more than 0 and 1 / 4 or less. In the present embodiment, when moisture-absorbent regions R4 are disposed at both ends of the longitudinal direction X, the thickness of only one of the moisture-absorbent regions R4 may be within the preferred range of the ratio T4 / T3 described above, but it is preferable that the thicknesses of both moisture-absorbent regions R4 be within the preferred range of the ratio T4 / T3 described above. The thickness can be measured, for example, using a laser thickness gauge.

[0028] In this embodiment, the moisture absorbing region R4 includes a pressure-bonded region R41 where two sheets 41, 41 are pressure-bonded to each other, and a non-pressed region R42 where the two sheets 41, 41 are not pressure-bonded to each other, as shown in Figures 2 and 3. The pressure-bonded region R41 is disposed closer to the edge of the absorbent body 23 on the side where the moisture absorbing region R4 exists in the longitudinal direction X than the non-pressed region R42. The advantage of having the pressure-bonded region R41 and the non-pressed region R42 in such a positional relationship is as follows. It is possible to prevent the moisture absorbing member 4 from spilling out from the edge of the absorbent body 23 on the side where the moisture absorbing region R4 exists, i.e., from the outer end of the absorbent body 23 in the longitudinal direction X. In addition, in the pressure-bonded region R41, since the two sheets 41, 41 are pressure-bonded together, the fixed member 42 may expand in the planar direction and the proportion of the fixed moisture-absorbent member 4a may increase compared to the non-pressure-bonded region R42. In contrast, since the two sheets 41, 41 are not pressure-bonded together in the non-pressure-bonded region R42, there is no risk of the proportion of the fixed moisture-absorbent member 4a increasing. In other words, since the moisture-absorbent region R4 includes the non-pressure-bonded region R42, the moisture-absorbent member 4 is allowed to swell sufficiently at least in the non-pressure-bonded region R42, and stuffiness during wear can be effectively reduced.

[0029] The ratio of the area of ​​the non-bonded region R42 in the moisture absorption region R4 is preferably 20% or more, more preferably 30% or more, and even more preferably 40% or more, from the viewpoint of preventing the movement of the moisture absorbing member in the moisture absorption region R4. Also, the ratio of the area of ​​the non-bonded region R42 in the moisture absorption region R4 is preferably 70% or less, more preferably 60% or less, and even more preferably 50% or less, from the viewpoint of efficient moisture absorption to reduce stuffiness during wearing. From the viewpoint of achieving both of these, the ratio of the area of ​​the non-bonded region R42 in the moisture absorption region R4 is preferably 20% or more and 70% or less, more preferably 30% or more and 60% or less, and even more preferably 40% or more and 50% or less.

[0030] In this embodiment, as described above, the ventral exterior body 3A has elastic members 33 extending along the lateral direction. Of the elastic members 33 of the ventral exterior body 3A, it is preferable that the stretching force of the elastic members 33 overlapping with the moisture absorbing region R4 in a plan view is stronger than that of the elastic members 33 overlapping with the central absorbent region R3. This allows the moisture absorbing region R4 to contract relatively strongly, thereby improving the fit of the diaper 1 to the waist of the wearer when worn. Furthermore, since the moisture absorbing region R4 of the diaper 1 is firmly attached to the waist of the wearer, the moisture absorbing region R4 can absorb moisture more efficiently, and thus the diaper 1 can be more effectively prevented from becoming stuffy when worn. For the same reason, it is also preferable that the elastic members 33 of the rear exterior body 3B overlapping the moisture absorbing region R4 in a plan view have a stronger stretching force than the elastic members 33 overlapping the central absorbent region R3.

[0031] The ratio of the elasticity of the elastic member 33 overlapping the moisture absorbing region R4 in plan view to the elasticity of the elastic member 33 overlapping the central absorbent region R3 is preferably 1.5 or more, more preferably 2.0 or more, and even more preferably 2.5 or more, from the viewpoint of improving fit and reducing stuffiness during wearing. Also, the ratio of the elasticity of the elastic member 33 overlapping the moisture absorbing region R4 in plan view to the elasticity of the elastic member 33 overlapping the central absorbent region R3 is preferably 4.0 or less, more preferably 3.5 or less, and even more preferably 3.0 or less, from the viewpoint of skin trouble due to abdominal tightening. Also, the ratio of the elasticity of the elastic member 33 overlapping the moisture absorbing region R4 in plan view to the elasticity of the elastic member 33 overlapping the central absorbent region R3 is preferably 1.5 or more and 4.0 or less, more preferably 2.0 or more and 3.5 or less, and even more preferably 2.5 or more and 3.0 or less, from the viewpoint of achieving both of these.

[0032] The stretching force of the elastic member 33 can be measured by the following method. <Method of measuring elasticity> Hereinafter, a method for measuring the stretching force of an elastic member that overlaps with the moisture absorbing region in a plan view will be described as an example. First, a ring-shaped measurement sample is cut out from the diaper at a position that overlaps with the moisture-absorbent region in the longitudinal direction. The cut-out measurement sample is in the shape of a ring, with the ventral exterior body 3A and the rear exterior body 3B joined at the side seal portion S. The width of the measurement sample, i.e., the length of the measurement sample in the longitudinal direction of the diaper, is the same as the length of the moisture-absorbent region in the longitudinal direction. Next, the measurement sample is stretched three times to the maximum extension. After that, the measurement sample is attached to the chuck of the tensile tester. Specifically, the measurement sample is attached so that the circumferential direction of the measurement sample is the tensile direction. The distance between the chucks at this time is 50 mm. An autograph (manufactured by Shimadzu Corporation, model number: AG-X, 10N-10kN) is used as the tensile tester. Then, the chuck distance is increased at a tensile speed of 300 mm / min, and the stress when the chuck distance is 150 mm (tensile distance is 100 mm) is taken as the expansion and contraction force of the elastic member that overlaps with the moisture absorbing region in a plan view. The stretching force of the elastic member overlapping the central absorbent region in plan view can be measured in the same manner as the stretching force of the elastic member overlapping the moisture-absorbing region in plan view. When measuring the stretching force of the elastic member overlapping the central absorbent region in plan view, annular measurement samples are cut out from the positions of the ventral exterior body and the dorsal exterior body that overlap the moisture-absorbing region in the longitudinal direction. The width of the measurement sample is the same as the width of the measurement sample used to measure the stretching force of the elastic member overlapping the moisture-absorbing region in plan view. The conditions for pulling the measurement sample with a tensile tester can be the same as the conditions for measuring the stretching force of the elastic member overlapping the moisture-absorbing region in plan view.

[0033] In this embodiment, the central absorbent region R3 includes the absorbent core 23a which is a stacked fiber mixture. Instead, the central absorbent region R3 may include a sheet material 5 in which a superabsorbent polymer is disposed between two sheets 41, 41, as shown in FIG. 5. In the embodiment shown in FIG. 5, the sheet material 5 is configured to include a superabsorbent polymer fixed between two sheets 41, 41 by a fixing member 42. That is, in the embodiment shown in FIG. 5, the sheet material 5 is used as the absorbent body 23. In the embodiment shown in FIG. 5, the sheet 41 may be made of paper, nonwoven fabric, woven fabric, or the like. The sheet 41 may also be made of a sheet containing absorbent fiber, wood pulp, natural pulp such as cotton and hemp, modified pulp, synthetic fiber, or the like.

[0034] In the embodiment shown in FIG. 5, similarly to the embodiment shown in FIG. 1, the basis weight of the moisture-absorbent member 4 in the central absorbent region R3 is preferably equal to or less than the basis weight of the moisture-absorbent member 4 in the moisture-absorbent region R4. By doing so, in the embodiment shown in FIG. 5, similarly to the embodiment shown in FIG. 1, the thickness T6 of the absorbent body 23 in the moisture-absorbent region R4 can be easily made thinner than the thickness T5 of the absorbent body 23 in the central absorbent region R3. In the embodiment shown in FIG. 5, for the same reason as in the embodiment shown in FIG. 1, the ratio of the basis weight of the moisture-absorbent member 4 in the central absorbent region R3 to the basis weight of the moisture-absorbent member 4 in the moisture-absorbent region R4 is preferably within the above-mentioned range. From the viewpoint of more significantly achieving the effects of reducing discomfort and improving fit, the basis weight of the moisture-absorbent member 4 in the central absorbent region R3 is preferably smaller than the basis weight of the moisture-absorbent member 4 in the moisture-absorbent region R4.

[0035] In the embodiment shown in Fig. 5, the preferred range of the ratio T6 / T4 of the thickness T6 of the moisture-absorbent region R4 to the thickness T5 of the central absorbent region R3 is the same as the preferred range of the ratio T4 / T3 for the same reasons as in the embodiment shown in Fig. 1. In the embodiment shown in Fig. 5, when moisture-absorbent regions R4 are arranged at both ends in the longitudinal direction X, the thickness of only one of the moisture-absorbent regions R4 may be within the preferred range of the ratio T6 / T5, but it is preferable that the thicknesses of both moisture-absorbent regions R4 are within the preferred range of the ratio T6 / T5 described above.

[0036] Next, a method for manufacturing the absorbent body 23 of the diaper 1 shown in FIG. 1 will be described with reference to FIG. First, as shown in Fig. 6(a), the core wrap sheet 23b is continuously unwound from a raw web in which the continuous belt-like core wrap sheet 23b is wound into a roll, and is transported in one direction X1. Then, a hot melt adhesive, which is a fixing member 42, is applied to one side of the transported core wrap sheet 23b. Next, absorbent cores 23a, which are a stacked fiber mixture, are intermittently arranged in the one direction X1 on the side of the core wrap sheet 23b on which the hot melt adhesive is applied. Then, a moisture absorbent member 4 is dispersed between the absorbent cores 23a adjacent to each other in the one direction X.

[0037] Thereafter, as shown in FIG. 6(b), the side regions of the core wrap sheet 23b in the orthogonal direction Y1 perpendicular to the one direction X are folded back to cover the absorbent cores 23a and the moisture absorbent member 4 with the core wrap sheet 23b, thereby obtaining the absorbent body continuum 23A. Next, the absorbent cores 23a adjacent to each other in the one direction X in the absorbent body continuum 23A are pressed from both sides of the absorbent body continuum 23A, and the core wrap sheets 23b covering both sides of the moisture absorbent member 4 are pressed together to form the pressed region R41. At this time, it is preferable to pressurize while heating. The method of pressing the absorbent body continuum 23A is not particularly limited, and for example, the absorbent body continuum 23A may be pressed by a pair of rolls facing each other. Then, the pressed region R41 in the absorbent body continuum 23A is cut in a direction perpendicular to the one direction X1 to obtain individual absorbents 23.

[0038] Next, the materials used to form each part of the diaper 1 in each of the above-described embodiments will be described. The top sheet 21 may be a liquid-permeable sheet, such as a nonwoven fabric or a perforated film. The surface of the top sheet facing the skin may be uneven. For example, a plurality of scattered convex portions may be formed on the surface of the top sheet facing the skin. Alternatively, ridges and grooves extending in one direction may be alternately formed on the surface of the top sheet facing the skin. For such a purpose, the top sheet may be formed using two or more sheets of nonwoven fabric.

[0039] On the other hand, the back sheet 22 may be, for example, a liquid-impermeable film or a spunbond-meltblown-spunbond laminated nonwoven fabric. A liquid-impermeable film may be provided with a plurality of micropores to impart water vapor permeability to the film. In order to further improve the feel of the absorbent article, a sheet with a good texture such as a nonwoven fabric may be laminated on the outer surface of the back sheet.

[0040] Although the present invention has been described above based on the preferred embodiments, the present invention is not limited to the above-mentioned embodiments. For example, the arrangement pattern of the fixing members 42 is not particularly limited. The arrangement pattern of the fixing members 42 may be an arrangement pattern having a coated portion where the fixing members 42 are applied and a non-coated portion where the fixing members 42 are not applied. The arrangement pattern of the fixing members 42 may be, for example, a spiral pattern (see FIG. 7(a)), a stripe pattern (see FIG. 7(b) to (d)), or the like. The arrangement pattern of the fixing members 42 in the moisture absorbing region R4 and the central absorbent region R3 may be the same or different. [Explanation of symbols]

[0041] 1. Diapers 2. Absorbent body 21 Surface sheet 22 Back sheet 23 Absorbent 3A Ventral exterior body 3B Dorsal exterior body 31 Inner sheet 32 Outer layer sheet 33 Elastic Members 4 Moisture absorbing material 41 sheets 42 Fixing member 5 Sheet material A Ventral part B Dorsal part C Inseam S Side seal part WH Waist opening LH leg opening R1,R2 end area R3 Central absorption area R4 Moisture absorption area R41 Crimp Area R42 Non-crimped area X vertical direction Y Horizontal

Claims

1. An absorbent body having a longitudinal direction corresponding to the front-to-back direction of a wearer and an orthogonal direction perpendicular to the longitudinal direction, The diaper has end regions located at both ends in the longitudinal direction, and a central absorbent region sandwiched between the end regions, At least one of the pair of end regions has a moisture absorbing region in which a moisture absorbing member is arranged, In the moisture absorbing region, the moisture absorbing member is located between two sheets, At least a portion of the moisture-absorbent member is adjacent to one of the two sheets, The absorbent body has, as the adjacent moisture-absorbent members, a fixed moisture-absorbent member fixed to the sheet, and a non-fixed moisture-absorbent member having at least one of the skin-facing side and the non-skin-facing side not fixed to the sheet.

2. The absorbent article according to claim 1 , wherein the central absorbent region comprises a mixed stack of absorbent fibers and a highly absorbent polymer.

3. The absorbent article of claim 2 , wherein the wicking region is thinner than the central absorbent region.

4. The absorbent article of claim 1 , wherein the central absorbent region comprises a sheet of material having a superabsorbent polymer disposed between two sheets.

5. The absorbent body according to any one of claims 1 to 4, wherein the moisture-absorbing member is a highly water-absorbent polymer.

6. The absorbent body according to any one of claims 1 to 5, wherein the fixed moisture-absorbing member is fixed to the sheet adjacent to the fixed moisture-absorbing member by a hot melt adhesive.

7. The absorbent body according to any one of claims 1 to 6, wherein the non-fixed moisture absorbent member is present in a greater amount on the skin-facing side of the absorbent body than on the non-skin-facing side of the absorbent body.

8. The moisture absorbing region includes a pressure-bonded region where the two sheets are pressure-bonded to each other, and a non-pressure-bonded region where the two sheets are not pressure-bonded to each other, The absorbent body according to any one of claims 1 to 7, wherein the bonded region is arranged closer to the edge of the absorbent body on the side where the moisture absorbing region is present in the longitudinal direction than the non-bonded region.

9. An absorbent article comprising an absorbent body having an absorbent substance and an exterior body arranged on a non-skin facing side of the absorbent body, The absorbent article according to any one of claims 1 to 8,

10. The exterior body has a ventral side exterior body arranged on a ventral side of a wearer when the absorbent article is worn, and a rear side exterior body arranged on a rear side of the wearer, The ventral exterior body or the dorsal exterior body has an elastic member arranged in a stretched state along a horizontal direction perpendicular to a vertical direction corresponding to a front-rear direction of a wearer, The absorbent article according to claim 9 , wherein the elastic members overlapping the moisture absorbing region in a planar view have a stronger stretching force than the elastic members overlapping the central absorbent region in a planar view.

Images