Absorbent resin sheet

Abstract

To effectively exhibit an antibacterial agent function in an absorbent resin sheet.SOLUTION: A SAP sheet 100 which is disposed on the side nearer the skin of a wearer than an absorber 150 of a diaper 200 and has a SAP 10 between nonwoven fabric sheets 30 in a thickness direction D forms a plurality of zones 41, 42 divided in a planar view orthogonal to the thickness direction D and has: a zone 41 which is a SAP high-basis-weight zone where basis weight of a SAP 10 is relatively high and a zone 42 to be a SAP low-basis-weight zone where basis weight of the SAP 10 is relatively low; and a high-basis-weight area of a relatively high basis weight of an antibacterial agent 20 and a low-basis-weight area of relatively low basis weight. The SAP high-basis-weight zone and an antibacterial agent high-basis-weight area are formed with 70% or more overlapping in a planar view.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] This invention relates to a water-absorbent resin sheet. [Background technology]

[0002] Various absorbent items, such as disposable diapers and auxiliary absorbent pads used by layering them inside disposable diapers, are equipped with so-called superabsorbent polymer sheets (hereinafter also called SAP sheets). SAP sheets are formed by sandwiching superabsorbent polymers (SAP) in the thickness direction between a liquid permeable sheet on the surface and a liquid permeable sheet on the back.

[0003] The absorbent material in the various absorbent articles mentioned above is made by entangling SAP (superabsorbent polymer) with fibrous pulp and dispersing it. By layering an SAP sheet on top of this absorbent material, it becomes possible to absorb more of the wearer's urine, allowing the absorbent article to be worn for a longer period of time.

[0004] Furthermore, the SAP sheet is positioned closer to the wearer's skin in the thickness direction (hereinafter referred to as the skin side) than the absorbent material of the absorbent article.

[0005] Incidentally, there are known absorbent materials that contain antibacterial agents to suppress the growth of bacteria in urine absorbed by the material, and deodorizers to suppress the spread of odor.

[0006] Examples of such products include a composite sheet having an uneven surface, with functional materials (SAP, pulp, deodorant) mixed into the protrusions, and the sheet on the reverse side (the side furthest from the wearer's skin) being stretchable (Patent Document 1), a sheet in which a liquid-permeable sheet is placed between the deodorant material and the absorbent core to separate them (Patent Document 2), a sheet containing SAP to which cationic polysaccharides are mixed or sprayed to promote menstrual blood absorption (Patent Document 3), and a hydrophilic antibacterial agent arranged continuously in the longitudinal direction, with a higher basis weight of the antibacterial agent in the area overlapping with the non-grooved part of the absorbent than in the area overlapping with the grooved part of the absorbent (Patent Document 4). [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2007-130819 [Patent Document 2] Japanese Patent Publication No. 2020-130951 [Patent Document 3] Japanese Patent Publication No. 2011-520531 [Patent Document 4] Japanese Patent Publication No. 2021-029928 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] When an antibacterial agent is placed on an absorbent material, it is preferable to place the antibacterial agent near the absorbent material in order to exert its antibacterial function by having it come into contact with the urine held in the absorbent material. Furthermore, in order to diffuse the antibacterial agent more widely, it is preferable to place the antibacterial agent on the skin side of the absorbent material, so that it is diffused together with the urine as it is discharged from the wearer.

[0009] However, when antibacterial agents are placed on an SAP sheet, if the antibacterial agents are uniformly distributed across the SAP sheet, when the SAP swells by absorbing urine, the urine that is subsequently excreted cannot flow through the swollen area of ​​the SAP. As a result, the antibacterial agents placed in the swollen area of ​​the SAP have difficulty diffusing into the absorbent material, and the function of the antibacterial agents provided on the SAP sheet cannot be effectively exercised.

[0010] This invention has been made in view of the above circumstances, and aims to provide an absorbent resin sheet (SAP sheet) that can effectively exert the function of an antibacterial agent. [Means for solving the problem]

[0011] The present invention relates to an absorbent resin sheet, which is positioned closer to the wearer's skin than the absorbent material of an absorbent article, and comprises a superabsorbent resin sandwiched between liquid-permeable sheets in the thickness direction, forming a plurality of compartments separated in a plan view perpendicular to the thickness direction, wherein the plurality of compartments have a high basis weight of absorbent resin compartment where the basis weight of the superabsorbent resin is relatively high, and a low basis weight of absorbent resin compartment where the basis weight of the superabsorbent resin is relatively low, and an antibacterial agent is positioned in the compartment or in the liquid-permeable sheet on the side of the liquid-permeable sheet furthest from the wearer's skin, and in the plan view, has a high basis weight of antibacterial agent region where the basis weight of the antibacterial agent is relatively high, and a low basis weight of antibacterial agent region where the basis weight of the antibacterial agent is relatively low, and the low basis weight of absorbent resin compartment and the high basis weight of antibacterial agent region are formed with an overlap of 70% or more in the plan view. [Effects of the Invention]

[0012] The absorbent resin sheet according to the present invention allows the antibacterial agent to exert its function effectively. [Brief explanation of the drawing]

[0013] [Figure 1] This diagram shows a disposable diaper, an example of an absorbent article equipped with an SAP sheet, with both sides separated and unfolded. [Figure 2]It is a cross-sectional view of a disposable diaper by a plane along the line A-A in FIG. 1. [Figure 3] It is a plan view showing the SAP sheet of Embodiment 1 in FIGS. 1 and 2. [Figure 4] It is a cross-sectional view of the SAP sheet by a plane along the line B-B in FIG. 3. [Figure 5] It is a cross-sectional view corresponding to FIG. 4 showing the SAP sheet after urine has flowed in. [Figure 6] It is a cross-sectional view corresponding to FIG. 4 showing the SAP sheet of a modification of Embodiment 1. [Figure 7] It is a plan view corresponding to FIG. 3 showing the SAP sheet of Embodiment 2. [Figure 8] It is a plan view corresponding to FIG. 7 showing the SAP sheet of a modification of Embodiment 2. [Figure 9] It is a cross-sectional view corresponding to FIG. 4 showing the SAP sheet of Embodiment 3. [Figure 10] It is a cross-sectional view corresponding to FIG. 9 showing the state where the SAP in the partition of the high basis weight region of the SAP in the SAP sheet of Embodiment 3 is expanded. [Figure 11] It is a cross-sectional view corresponding to FIG. 10 showing the state where the SAP in the partition of the high basis weight region of the SAP in the SAP sheet of Embodiment 3 is further expanded and the weak joint part is broken. <{ [[ID=]29]

Mode for Carrying Out the Invention

[0014] The following description relates to an embodiment of an absorbent resin sheet according to the present invention.

[0015] FIG. 1 is a view showing both sides of a disposable diaper 200 having a SAP sheet 100 separated and developed back and forth, FIG. 2 is a cross-sectional view of the disposable diaper 200 by a plane along the line A-A in FIG. 1, FIG. 3 is a plan view showing the SAP sheet 100 of Embodiment 1 in FIGS. 1 and 2, FIG. 4 is a cross-sectional view of the SAP sheet 100 by a plane along the line B-B in FIG. 3, and FIG. 5 is a cross-sectional view corresponding to FIG. 4 showing the SAP sheet 100 after urine has flowed in. The illustrated SAP sheet 100 is an embodiment of the absorbent resin sheet according to the present invention.

[0016] <Embodiment 1> The disposable diaper 200 shown in Figure 1 (hereinafter simply referred to as "diaper 200") is formed with an abdominal portion 110, a crotch portion 120, and a dorsal portion 130 connected in the longitudinal direction L. The abdominal portion 110 corresponds to the abdominal side of the wearer's front, mainly covering the lower abdomen; the crotch portion 120 corresponds to the part that mainly covers the wearer's crotch area; and the dorsal portion 130 corresponds to the part that mainly covers the wearer's buttocks. When the diaper 200 is worn by the wearer, the left-right direction of the wearer is the width direction W of the diaper 200 and SAP sheet 100.

[0017] As shown in Figure 1, the SAP sheet 100 of this embodiment is placed on top of the diaper 200, for example, on the back portion 130. However, the SAP sheet 100 is not limited to being placed on top of the back portion 130; it may also be placed on top of the front portion 110, or on top of the crotch portion 120, or it may be placed separately in two or more locations on the front portion 110, the crotch portion 120, and the back portion 130, or it may be placed as a single sheet that spans two or more locations.

[0018] In Figure 2, the diaper 200 is worn so that the wearer's skin is in contact with the top sheet 141, which is located on the skin-facing side in the thickness direction D. Therefore, in the diaper 200 when worn by the wearer, the SAP sheet 100 is positioned closer to the wearer's skin, that is, closer to the top sheet 141, than the normal absorbent material 150 of the diaper 200.

[0019] In this context, the typical absorbent material 150 in diaper 200 is positioned between a liquid-permeable top sheet 141 and a liquid-impermeable back sheet 142, and is made by dispersing granular SAP (superabsorbent polymer) entangled with fibrous pulp. For example, the absorbent material 150 consists of an upper absorbent layer 151 closer to the top sheet 141 and a lower absorbent layer 152 closer to the back sheet 142.

[0020] As shown in Figure 2, the SAP sheet 100 of this embodiment is formed by sandwiching particulate SAP 10 and particulate antibacterial agent 20 between nonwoven fabric sheets 30 in the thickness direction D and wrapping them to form a single sheet. The nonwoven fabric sheet 30 is an example of a liquid-permeable sheet, and any sheet that is liquid-permeable does not have to be made of nonwoven fabric.

[0021] With the SAP sheet 100 placed on the diaper 200, the nonwoven fabric sheets 30 that are placed on the side closer to the wearer's skin (the side closer to the top sheet 141) are distinguished as nonwoven fabric sheet 31, and the nonwoven fabric sheets that are placed on the side further away from the wearer's skin (the side closer to the back sheet 142) are distinguished as nonwoven fabric sheet 32.

[0022] Furthermore, as shown in Figures 3 and 4, the SAP sheet 100 forms a plurality of compartments 41 and 42 separated in a plan view perpendicular to the thickness direction D. These compartments 41 and 42 are formed by joining the upper nonwoven fabric sheet 31 and the lower nonwoven fabric sheet 32 ​​at the edges of the areas separated as compartments 41 and 42 by heat fusion.

[0023] In other words, in the areas partitioned as sections 41 and 42, a space is formed between the nonwoven fabric sheet 31 and the nonwoven fabric sheet 32, while in the area separating sections 41 and 42, there is no space between the nonwoven fabric sheet 31 and the nonwoven fabric sheet 32 ​​because they are joined together. Furthermore, the joint 43 where the nonwoven fabric sheet 31 and the nonwoven fabric sheet 32 ​​are joined by heat fusion becomes impermeable to liquid, preventing urine from passing through.

[0024] Sections 41 and 42 are each formed in an elongated shape extending along the longitudinal direction L, as shown in Figure 3, and are arranged alternately along the width direction W of the diaper 200.

[0025] In the cross-sectional view of the SAP sheet 100 shown in FIG. 4, the joint portion 43 is represented by a wall portion connecting between the non-woven fabric sheet 31 and the non-woven fabric sheet 32. This is for simplification of the drawing. Since the wall portion indicated as the joint portion 43 is the portion where the non-woven fabric sheet 31 and the non-woven fabric sheet 32 are joined, actually, it is not a wall portion. However, forming the joint portion 43 as a wall portion joined to the non-woven fabric sheet 31 and the non-woven fabric sheet 32 does not exclude partitioning the compartments 41 and 42.

[0026] Compartment 41 has a higher basis weight (content weight per unit area [g / m 2 , 2 , 2 , 2 , 2 , , ,

[0029] ) of SAP10 and a lower basis weight of the antibacterial agent 20 compared to compartment 42. That is, compartment 41 has a relatively higher basis weight of SAP10, and compartment 42 has a relatively lower basis weight of SAP10. On the other hand, compartment 41 is a region with a relatively lower basis weight of the antibacterial agent 20, and compartment 42 is a region with a relatively higher basis weight of the antibacterial agent 20.

[0027] As an example of a relatively high basis weight of SAP10, it is 130 to 300 [g / m 2 , and as an example of a relatively low basis weight of SAP10, it is 0 to 200 [g / m 2 .

[0028] Note that when the relatively low basis weight of SAP10 is, for example, 200 [g / m 2 , the relatively high basis weight of SAP10 exceeds 200 [g / m 2 , for example, 201 to 300 [g / m 2 , and when the relatively high basis weight of SAP10 is, for example, 130 [g / m 2 , the relatively low basis weight of SAP10 is less than 130 [g / m 2 , for example, 0 to 129 [g / m 2 .

[0029] Regarding the antibacterial agent 20, since the weight required to exert its effect varies considerably depending on the type of antibacterial agent 20, the specific numerical value of the amount is set according to the type of antibacterial agent 20.

[0030] Therefore, in SAP sheet 100, both the high-weight area of ​​SAP 10 and the low-weight area of ​​antibacterial agent 20 are compartment 41, so the overlap between the high-weight area of ​​SAP 10 and the low-weight area of ​​antibacterial agent 20 in a plan view is 100%. Also, in SAP sheet 100, both the low-weight area of ​​SAP 10 and the high-weight area of ​​antibacterial agent 20 are compartment 42, so the overlap between the low-weight area of ​​SAP 10 and the high-weight area of ​​antibacterial agent 20 in a plan view is 100%.

[0031] Sections 41 and 42 are each formed in an elongated shape extending along the longitudinal direction L, as shown in Figure 3, and are arranged alternately along the width direction W of the diaper 200.

[0032] The function of the diaper 200 equipped with the SAP sheet 100 configured as described above is as follows. As shown in Figure 4, when urine discharged from the wearer flows into the SAP sheet 100 through the nonwoven fabric sheet 31, in compartment 41, the antibacterial agent 20 that comes into contact with the urine dissolves in the urine and exerts an antibacterial effect.

[0033] Furthermore, as the urine passes through compartment 41, it is absorbed to some extent by the SAP 10 in compartment 41, and as shown in Figure 5, the SAP 10 gradually expands. Since compartment 41 is a high-basicity region of SAP 10, as the amount of urine passing through increases, the SAP 10 that has absorbed the urine and expanded fills the compartment 41, obstructing the passage through which the urine should flow and making it difficult for the urine to pass through compartment 41. As a result, the urine that should flow into compartment 41 flows into compartment 42, which is adjacent to compartment 41, as shown by the curved arrow in Figure 5.

[0034] On the other hand, when urine discharged from the wearer flows onto the SAP sheet 100, in section 42, the antibacterial agent 20 that comes into contact with the urine dissolves in the urine and exerts an antibacterial effect due to its antibacterial components.

[0035] Furthermore, as the urine passes through compartment 42, it is partially absorbed by the SAP 10 in compartment 42, causing the SAP 10 to gradually expand. Since compartment 42 is a low-basic-value region of the SAP 10, even as the amount of urine passing through increases, the expanded SAP 10 does not fill compartment 42. In other words, compartment 42 does not obstruct the passage of urine even after the SAP 10 has expanded to its maximum extent. As a result, compartment 42 can allow urine that can no longer flow into the adjacent compartment 41 to pass through.

[0036] This allows the SAP sheet 100 to easily bring urine into contact with the high-basicity antibacterial agent 20 in compartment 42, and to easily diffuse the antibacterial components of the antibacterial agent 20 into the absorbent material 150.

[0037] As described in detail above, in the SAP sheet 100 of this embodiment 1, the antibacterial agent 20 is positioned on the skin-facing side of the absorbent material 150, making it easier for the antibacterial agent 20 to come into contact with the urine discharged from the wearer. Furthermore, even after the SAP 10 expands, the SAP sheet 100 does not obstruct the flow of urine, and the urine can come into contact with the antibacterial agent 20 in an area that does not obstruct the flow of urine, thus allowing the antibacterial agent 20 provided on the SAP sheet 100 to exert its function effectively.

[0038] In Embodiment 1, the SAP sheet 100 is configured to have SAP 10 placed in section 42, but SAP 10 does not need to be placed in section 42. In other words, section 42 may be configured to have only the antibacterial agent 20. That is, the low basis weight region of SAP 10 also includes a basis weight of 0 for SAP 10.

[0039] On the other hand, while compartment 41 may be configured with only SAP 10 and no antibacterial agent 20, in this case, the SAP 10 will expand and the urine that has passed through compartment 41 will not be able to be disinfected before the urine stops flowing through compartment 41. Therefore, it is preferable to place the antibacterial agent 20 in compartment 41. In other words, it is preferable to place the antibacterial agent 20 over the entire surface of the area of ​​the SAP sheet 100 through which urine can pass, that is, the area other than the joint 43.

[0040] In this embodiment, the SAP sheet 100 has a 100% overlap between the low-weight area of ​​SAP 10 and the high-weight area of ​​the antibacterial agent 20 in a plan view. However, it is sufficient if the overlap between the low-weight area of ​​SAP 10 and the high-weight area of ​​the antibacterial agent 20 in a plan view is 70% or more. With this level of overlap, even if SAP 10 expands, the flow of urine can be ensured and the antibacterial agent 20 can be effectively diffused. This point is also the same for the SAP sheet of the embodiment described later.

[0041] Furthermore, a planar overlap of 70% or more between the low-weight area of ​​SAP10 and the high-weight area of ​​antibacterial agent 20 means that, if the low-weight area of ​​SAP10 is larger in area than the high-weight area of ​​antibacterial agent 20, the low-weight area of ​​SAP10 overlaps with 70% or more of the area of ​​the high-weight area of ​​antibacterial agent 20, using the smaller area of ​​the high-weight area of ​​antibacterial agent 20 as the reference.

[0042] Conversely, if the low-weight region of SAP10 is smaller in area than the high-weight region of antimicrobial agent 20, then a planar overlap of 70% or more between the low-weight region of SAP10 and the high-weight region of antimicrobial agent 20 means that, using the area of ​​the smaller low-weight region of SAP10 as a reference, the high-weight region of antimicrobial agent 20 overlaps 70% or more of the area of ​​the low-weight region of SAP10.

[0043] Furthermore, in the SAP sheet 100 of this embodiment, the high-weight area of ​​SAP 10 and the low-weight area of ​​the antibacterial agent 20 overlap 100% in a plan view, but it is preferable that the high-weight area of ​​SAP 10 and the low-weight area of ​​the antibacterial agent 20 overlap 70% or more in a plan view. This point is also the same for the SAP sheet of the embodiment described later.

[0044] Furthermore, a planar overlap of 70% or more between the high-weight area of ​​SAP10 and the low-weight area of ​​antibacterial agent 20 means that, if the high-weight area of ​​SAP10 is larger in area than the low-weight area of ​​antibacterial agent 20, the high-weight area of ​​SAP10 overlaps with 70% or more of the area of ​​the low-weight area of ​​antibacterial agent 20, using the smaller area of ​​the low-weight area of ​​antibacterial agent 20 as the reference.

[0045] Conversely, if the high-weight region of SAP10 is smaller in area than the low-weight region of the antibacterial agent 20, then an overlap of 70% or more in a plan view between the high-weight region of SAP10 and the low-weight region of the antibacterial agent 20 indicates that, using the area of ​​the smaller high-weight region of SAP10 as a reference, the low-weight region of the antibacterial agent 20 overlaps 70% or more of the area of ​​the high-weight region of SAP10.

[0046] In this embodiment, the SAP sheet 100 uses granular solid SAP 10 and antibacterial agent 20, but the antibacterial agent 20 may be liquid. That is, the antibacterial agent 20 can be inorganic or organic. Inorganic antibacterial agents are generally solid at room temperature, while organic antibacterial agents are often liquid at room temperature.

[0047] Furthermore, while solid antibacterial agents can be formed into granules as described above and placed within compartments 41 and 42, liquid antibacterial agents cannot be placed within compartments 41 and 42.

[0048] Therefore, if an organic antibacterial agent is applied as the antibacterial agent 20, the antibacterial agent 20 should not be placed in compartments 41 and 42, but rather the nonwoven fabric sheet 30 of the SAP sheet 100 that is furthest from the wearer's skin should be placed in the nonwoven fabric sheet 30 To 32 The nonwoven fabric sheet can be placed by impregnating or coating it with liquid antibacterial agent 20. To32 By varying the amount of antibacterial agent impregnated or applied to each area, high-basis-concentration and low-basis-concentration areas of the antibacterial agent 20 can be formed. This is also true for the SAP sheet of the embodiment described later.

[0049] <Modified form of Embodiment 1> Figure 6 is a cross-sectional view corresponding to Figure 4 showing a modified SAP sheet 100 of Embodiment 1. In Embodiment 1, the nonwoven fabric sheet 31 on the skin side is flat before the SAP 10 in section 41 expands, and protrudes toward the skin side after the SAP 10 in section 41 expands. However, in a modified SAP sheet 100, as shown in Figure 6, the nonwoven fabric sheet 31 may already be protruding toward the skin side before the SAP 10 in section 41 expands.

[0050] In this modified SAP sheet 100, the section 42 may also protrude towards the skin side beforehand. However, in this modified SAP sheet 100, it is preferable that the amount of protrusion of section 42 is smaller than the amount of protrusion of section 41.

[0051] This modified SAP sheet 100 exhibits the same effects as the SAP sheet 100 of Embodiment 1.

[0052] <Embodiment 2> Figure 7 is a plan view corresponding to Figure 3, showing the SAP sheet 300. The SAP sheet 300 is one embodiment (Embodiment 2) of the SAP sheet according to the present invention.

[0053] In Embodiment 1, the SAP sheet 100, as shown in Figure 3, has a compartment 41 formed in an elongated shape that extends along the longitudinal direction L, similar to the compartment 42. However, the shape of the compartment 41 is not limited to this shape. Figure 7 is a plan view corresponding to Figure 3, showing an SAP sheet 300 having a compartment 41 formed in a shape that facilitates the guidance of urine that should flow into compartment 41 to compartment 42 after the compartment 41 has expanded.

[0054] The SAP sheet 300 is formed in a shape that facilitates the guidance of urine flowing into compartment 41 to compartment 42 after compartment 41 has expanded. The SAP sheet 300 has the same configuration as the SAP sheet 100 of Embodiment 1, except that the shape of compartment 41 and the shape of the joint portion 43 that divides and forms the contour of compartment 41 are different.

[0055] In other words, section 41 in the SAP sheet 300 is a high-weight area of ​​SAP 10 and a low-weight area of ​​antimicrobial agent 20. Section 42, which is a low-weight area of ​​SAP 10 and a high-weight area of ​​antimicrobial agent 20, is formed in the same way as the SAP sheet 100, with spacing in the width direction W and elongated along the longitudinal direction L.

[0056] Furthermore, section 41 is formed in the area between sections 42 in the width direction W where section 42 is not formed. Each section 41 is formed in a roughly rhombic shape in plan view, and the contour edges of the rhombuses are oriented so as to be inclined with respect to the longitudinal direction L and the width direction W. Parts of the contour edges of these sections 41 are formed so as to be close to or partially overlapping with section 42 in plan view. Multiple sections 41 are formed scattered along the longitudinal direction L in the area between sections 42 where section 42 is not formed.

[0057] The area of ​​the SAP sheet 300 where neither section 41 nor section 42 is formed is the joint 43, and the joint 43 is impermeable to urine, just like the SAP sheet 100.

[0058] The SAP sheet 300 formed in this manner exhibits the same function and effect as the SAP sheet 100. Furthermore, the SAP sheet 300 makes it easier to guide the urine that flows into the SAP sheet 300 to compartment 42.

[0059] In other words, as shown in Figure 7, urine flowing along the surface of the SAP sheet 300 in the longitudinal direction L does not pass in the thickness direction D at the joint 43, but passes in the thickness direction D at sections 41 and 42, similar to the SAP sheet 100.

[0060] Here, the SAP 10 in compartment 41 expands due to the urine passing through compartment 41, and as shown in Figure 5, the nonwoven fabric sheet 31 of compartment 41 protrudes in the thickness direction D compared to the nonwoven fabric sheet 31 of compartment 42, causing the rhombus-shaped compartment 41 shown in Figure 7 to protrude. As a result, as shown by the arrow in Figure 6, the urine that flows in the longitudinal direction L along the surface of the SAP sheet 300 hits the edge of compartment 41, flows along the edge of compartment 41, and is guided to compartment 42 where the edge extends.

[0061] Thus, in this embodiment, the SAP sheet 300 makes it easier to guide urine through the compartment 42 adjacent to compartment 41 in the width direction after the SAP 10 in compartment 41 has expanded.

[0062] This allows the SAP sheet 300 to easily bring urine into contact with the high-basicity antibacterial agent 20 in compartment 42, and to easily diffuse the antibacterial components of the antibacterial agent 20 into the absorbent material 150.

[0063] <Modified form of Embodiment 2> Figure 8 is a plan view corresponding to Figure 7, showing a modified SAP sheet 300 of Embodiment 2. In Embodiment 2, the SAP sheet 300 has compartments 42 that extend along the longitudinal direction L, but as shown in Figure 8, the compartments 42 may be formed to be elongated along the width direction W. In this case, the compartments 42 are formed to be elongated with spacing in the longitudinal direction L.

[0064] Furthermore, section 41 is formed in the area between sections 42 in the longitudinal direction L where section 42 is not formed. In addition, each section 41 is formed in the shape of an arc that is convex toward one direction in the longitudinal direction L when viewed from above. Multiple sections 41 are formed scattered along the width direction W in the area between sections 42 where section 42 is not formed.

[0065] The area of ​​the SAP sheet 300 where neither section 41 nor section 42 is formed is the joint 43, and the joint 43 is impermeable to urine, just like the SAP sheet 100.

[0066] The modified SAP sheet 300 formed in this manner exhibits the same effects as the SAP sheet 300 of Embodiment 2 shown in Figure 7. Furthermore, in the modified SAP sheet 300, since the compartments 41 are formed dispersed along the width direction W, even if the SAP 10 of compartment 41 expands and urine can no longer flow through compartment 41, a joint portion 43 remains between compartment 41 and other compartments 41 in the width direction W, as an unexpanded portion. Therefore, urine that flows into the area between compartments 42 of the SAP sheet 300 where no compartments 42 are formed is guided to compartment 42 along the longitudinal direction L through the unexpanded portion, as shown in Figure 8, even after the compartments 41 have expanded.

[0067] As a result, the modified SAP sheet 300 also makes it easier for urine to come into contact with the high-weight antibacterial agent 20 in section 42, and makes it easier for the antibacterial components of the antibacterial agent 20 to diffuse into the absorbent material 150.

[0068] <Embodiment 3> Figure 9 is a cross-sectional view corresponding to Figure 4 showing the SAP sheet 400 of Embodiment 3, Figure 10 is a cross-sectional view corresponding to Figure 9 showing the state in which the SAP 10 of section 41 in the SAP sheet 400 has expanded, and Figure 11 is a cross-sectional view corresponding to Figure 10 showing the state in which the SAP 10 of section 41 in the SAP sheet 400 has expanded further and the joint 43A, which is a weak joint, has fractured.

[0069] In Embodiment 3 of the present invention, as shown in Figure 9, at least a portion of the joint portion 43A of the joint portion 43 (partition portion) that separates compartment 41 and compartment 42 is set to be more prone to breakage than the remaining joint portion 43B. The ease with which the joint portion 43A breaks is such that it breaks due to the increased pressure inside compartment 41 when the SAP 10 in compartment 41 expands.

[0070] In other words, joint 43A is fractured by the increased pressure inside compartment 41 due to the expansion of SAP 10 within compartment 41, while joint 43B is not fractured by the increased pressure inside compartment 41 due to the expansion of SAP 10 within compartments 41 and 42. Therefore, joint 43A is a weak joint with relatively lower joint strength compared to joint 43B, and joint 43B is a strong joint with relatively higher joint strength compared to joint 43A.

[0071] The SAP sheet 400 has at least one section 42 formed along the width direction W, and the joint 43 that separates both sides of the section 42 in the width direction W is formed by a joint 43B which is a strong joint.

[0072] The SAP sheet 400 of Embodiment 3, configured as described above, exhibits the same effects as the SAP sheet 100. Furthermore, when urine flows into the SAP sheet 400, the SAP 10 in compartment 41 expands, as shown in Figure 10, reducing the flow of urine in compartment 41.

[0073] As urine continues to flow into the SAP sheet 400, the SAP 10 in compartment 41 absorbs more urine and expands further, increasing the pressure inside compartment 41. When the pressure inside compartment 41 exceeds a predetermined level, the weak joint 43A ruptures, as shown in Figure 11, connecting the interior of compartment 41 and the interior of compartment 42.

[0074] This expands the space in which the SAP 10 located inside compartment 41 can expand, further promoting the expansion of the SAP 10 and increasing the amount of urine absorbed by the SAP 10. In addition, in the space where compartment 41 and compartment 42 are connected, the further expansion of the SAP 10 can adjust the compartments through which urine can pass and those through which it cannot.

[0075] Furthermore, the SAP sheet 400 has at least one compartment 42 formed along the width direction W, and the joint 43 separating both sides of the compartment 42 in the width direction W is formed by a joint 43B which is a strong joint. Therefore, urine flowing in the longitudinal direction L can be diffused in the longitudinal direction L by passing through the surface of the compartment 42, which has both sides formed by the joint 43B.

[0076] Furthermore, the SAP sheet 400 also facilitates contact between urine and the high-weight antibacterial agent 20 in compartment 42, and facilitates the diffusion of the antibacterial components of the antibacterial agent 20 into the absorbent material 150. [Explanation of symbols]

[0077] 10 SAP (Superabsorbent Polymer) 20 Antibacterial agents 30, 31, 32 Nonwoven fabric sheets 41 SAP high-grade plots 42 SAP low-grade compartments 43 Joint 100, 300, 400 SAP sheets 150 absorbent 200 disposable diapers D: Thickness direction L Longitudinal direction W (width direction)

Claims

1. An absorbent resin sheet, which is positioned closer to the wearer's skin than the absorbent core of an absorbent article, is a sheet in which a highly absorbent resin is sandwiched between liquid-permeable sheets in the thickness direction, In a plan view perpendicular to the thickness direction, a plurality of partitions are formed, The plurality of compartments include a high-basis-weight-of-absorbent-resin compartment where the basis weight of the superabsorbent-absorbent-resin is relatively high, and a low-basis-weight-of-absorbent-resin compartment where the basis weight of the superabsorbent-absorbent-resin is relatively low. The antibacterial agent is placed in the compartment or on the liquid-permeable sheet furthest from the wearer's skin, and in the plan view, it has a high-basis-weight antibacterial agent region where the basis weight of the antibacterial agent is relatively high, and a low-basis-weight antibacterial agent region where the basis weight of the antibacterial agent is relatively low. The low-weight absorbent resin area and the high-weight antibacterial agent area are formed with an overlap of 70% or more in the plan view. The absorbent resin sheet is formed such that the high-basis-weight antibacterial agent region extends without partitions along the longitudinal direction connecting the ventral, groin, and dorsal portions of the absorbent article, or along the width direction corresponding to the left-right direction of the wearer when the article is worn by the wearer.

2. The absorbent resin sheet according to claim 1, wherein the absorbent resin high-weight area and the antibacterial agent low-weight area are formed with an overlap of 70% or more in the plan view.

3. The absorbent resin sheet according to claim 2, wherein the absorbent resin high-weight compartments are formed dispersed along the width direction.

4. The absorbent resin sheet according to any one of claims 1 to 3, wherein the low-weight absorbent resin section is formed to have a lower height on the side closer to the wearer's skin compared to the high-weight absorbent resin section.

5. The absorbent resin sheet according to any one of claims 1 to 3, wherein at least a portion of the plurality of partitions separating the absorbent resin high-weight portion and the absorbent resin low-weight portion is set to be more easily broken than the other portion of the plurality of partitions separating the absorbent resin high-weight portion and the absorbent resin low-weight portion, or the partitions separating the absorbent resin low-weight portions from each other.

6. Along the width direction, at least one of the absorbent resin low basis weight sections is formed, The absorbent resin sheet according to claim 5, wherein the partition portion in the width direction of the at least one of the absorbent resin low basis weight compartments is set to be less likely to break than at least some of the partition portions of the plurality of partition portions which are set to be more likely to break.

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