TWI756291B - absorbent articles - Google Patents

Abstract

In the present invention, a sweat-absorbing sheet (10) is disposed at a position where the absorbent article may come into contact with the wearer's skin during wearing. The sweat-absorbing sheet (10) has a first layer (10A) closest to the wearer's skin, and a second layer (10B) arranged to overlap on the non-skin-facing surface of the first layer (10A). In the top view of the first layer (10A), a plurality of hydrophilic regions (11) are dispersed and there are hydrophobic regions (12) around each of the plurality of hydrophilic regions (11), and the second layer (10B) is composed of hydrophilic regions. Made of non-woven fabric.

Description

absorbent articles

The present invention relates to an absorbent article comprising a sweat-absorbing sheet having a sweat-absorbing effect.

Conventionally, in absorbent articles such as disposable diapers, in order to reduce skin problems such as sweat rashes, a sweat-absorbing sheet composed of a hydrophilic material has been disposed at a portion that may come into contact with the wearer's skin during wearing. In Patent Documents 1 to 3, it is described that a laminated structure in which two or more layers of fibers are laminated is used as a sweat-absorbing sheet. The sweat-absorbent sheet described in Patent Document 1 has an inner hydrophilic sheet closest to the wearer's skin, and an outer hydrophilic sheet disposed on the non-skin-facing surface side of the inner hydrophilic sheet. In Document 1, the outer hydrophilic sheet has higher liquid diffusivity than the inner hydrophilic sheet, and therefore, the sweat that migrates to the outer hydrophilic sheet can be quickly diffused. In Patent Document 1, as a specific configuration of these hydrophilic sheets, it is described that the constituent fibers of the outer hydrophilic sheet are aligned in the transverse direction of the absorbent article (the direction perpendicular to the longitudinal direction corresponding to the front-rear direction of the wearer). , The inner hydrophilic sheet is easier to compress and deform than the outer hydrophilic sheet, and the outer hydrophilic sheet has a higher density than the inner hydrophilic sheet. On the other hand, the sweat-absorbent sheet described in Patent Document 2 is one in which the layer closest to the wearer's skin is composed of a mixed layer of hydrophilic fibers and hydrophobic fibers. According to the sweat-absorbing sheet described in Patent Document 2, the hydrophilic fibers contained in the layer in contact with the skin absorb sweat and dry the skin, and the hydrophobic fibers contained in the layer block the absorption of sweat and become wet The hydrophilic fibers are closely attached to the skin, so it can bring a cool feeling to the skin. In addition, Patent Document 2 describes a sweat-absorbent sheet having a three-layer structure in which an intermediate layer mainly composed of hydrophilic fibers is interposed between the two outermost mixed layers. The sweat-absorbing sheet allows the sweat absorbed in the outermost layer to penetrate and diffuse toward the hydrophilic fibers in the middle layer, so as to keep it away from the skin, thereby further enhancing the cooling sensation on the skin. Furthermore, the sweat-absorbent sheet described in Patent Document 3 has an inner layer closest to the wearer's skin and an outer layer adjacent to the inner layer, both of which are mixed layers of hydrophilic fibers and hydrophobic fibers, but the inner layer It is mainly composed of hydrophobic fibers, and the outer layer is mainly composed of hydrophilic fibers. In addition, a part of the hydrophilic fibers of the outer layer reaches the skin-opposing side of the sweat-absorbing sheet through the inter-fiber gaps of the inner layer, and the sweat of the wearer is released from the inner layer by the sweat-absorbing effect of the hydrophilic fibers extending from the outer layer. Migrates to the outer layer, so that the surface of the skin is not wet but always dry. Prior Art Documents Patent Documents Patent Document 1: Japanese Patent Laid-Open No. 2010-246901 Patent Document 2: Japanese Patent Laid-Open No. 2007-301346 Patent Document 3: Japanese Patent Laid-Open No. 2001-327534

The present invention relates to an absorbent article in which a sweat-absorbing sheet is disposed at a position that may come into contact with the wearer's skin during wearing. The said sweat absorbing sheet has the 1st layer closest to the wearer's skin, and the 2nd layer arrange|positioned overlappingly on the non-skin opposing surface of this 1st layer. In a plan view of the first layer, a plurality of hydrophilic regions are dispersed and there are hydrophobic regions around each of the plurality of hydrophilic regions, and the second layer is a hydrophilic nonwoven fabric.

The technologies related to the sweat-absorbent sheets described in Patent Documents 1 to 3 can suppress the occurrence of skin problems such as sweat rash to some extent, but there is still room for improvement. Absorbent articles that can quickly absorb sweat, keep it away from the wearer's skin, and make the absorbed sweat evaporate quickly, so that the wearer's skin is always kept dry, so that it is not easy to cause skin problems such as sweat rash. An object of the present invention is to provide an absorbent article that can quickly absorb sweat, spread it away from the wearer's skin, and evaporate quickly so that it is less likely to cause skin problems such as sweat rash. Hereinafter, the present invention will be described with reference to the drawings based on preferred embodiments of the present invention. 1-4, the underpants type disposable diaper 1A which is one Embodiment of the absorbent article of this invention is shown. As shown in FIGS. 1 to 5 , the diaper 1A has a longitudinal direction X corresponding to the front-rear direction of the wearer, and a transverse direction Y perpendicular to the longitudinal direction X, and has a lower crotch portion B and extending from the lower crotch portion B in the front and rear along the longitudinal direction X. The ventral part A and the back part C which come out are provided with the absorber 23 of liquid retention in the lower part B of the crotch. The lower crotch portion B is arranged at the crotch portion of the wearer in the wearing state of the diaper 1A, and the abdominal portion A is arranged at the front side of the wearer's abdomen rather than the lower crotch portion B in the wearing state of the diaper 1A. The back side part C is arranged at the back side of the wearer, that is, the back side in the longitudinal direction X, rather than the lower part B of the crotch in the wearing state of the diaper 1A. The diaper 1A is provided with an absorbent body 2 including an absorber 23 in the central portion of the transverse direction Y, and is provided on the non-skin-opposite side of the absorbent body 2, that is, farther from the wearer's body than the absorbent body 2 The outer casing 3 on the side, the side edges AS and CS of the outer casing 3 along the longitudinal direction X of each of the abdominal part A and the back part C are joined to each other by known bonding such as adhesive, heat sealing, ultrasonic sealing, etc. As shown in FIG. 1, a pair of side seals S, S, a waist opening WH for the wearer's torso to pass through, and a pair of leg openings LH, LH for the wearer's lower limbs to pass through are formed. . The absorbent body 2 is in the unfolded and extended state of the diaper 1A as shown in FIG. 2 , and has a rectangular shape in plan view, and extends from the abdominal part A across the back part C in the longitudinal direction X, and its longitudinal direction is the same as the unfolded and extended state. The longitudinal direction X of the diaper 1A in the state is aligned, it is arranged in the center part of the lateral direction Y of the outer casing 3, and is joined to the outer casing 3 by an adhesive. The "deployed and stretched state" of the diaper 1A means that the diaper 1A is separated from the side seal portion S to be in an expanded state, the diaper 1A in the expanded state is spread, and the elastic members of each part are stretched until the design size (and In the state where all the influence of the elastic member is excluded, the dimensions are the same when it is spread in a flat shape) up to the state. As shown in FIG. 3, the absorptive main body 2 is provided with the liquid-permeable front sheet 21 which forms the skin-opposing surface, and the liquid-impermeable, liquid impermeable, or water-repellent back sheet 22 which forms the non-skin-opposing surface. , and the liquid-retaining absorber 23 disposed between the two sheets 21 and 22 are integrated by a known bonding method such as an adhesive. In the present embodiment, the absorber 23 includes a liquid-retaining absorptive core 231, and a core wrap sheet covering the outer surfaces of the absorptive core 231 (both surfaces of the skin-facing surface and the non-skin-facing surface). 232 to form. The absorptive core 231 and the core wrapping material 232 are joined by a known joining method such as a hot melt adhesive. In this specification, the "skin-facing side" refers to the side of the absorbent article or its constituent members (such as the front sheet) that faces the wearer's skin when the absorbent article is worn, that is, the side that is relatively close to the wearer's skin. The "non-skin-facing side" refers to the side of the absorbent article or its constituent member that faces the opposite side of the skin side when the absorbent article is worn, that is, the side that is relatively far from the wearer's skin. In addition, the term "wearing" here refers to a state in which the normal proper wearing position, that is, the correct wearing position of the absorbent article is maintained. As the surface sheet 21, the back sheet 22, and the absorptive core 231 and the core wrapping sheet 232 constituting the absorber 23, various materials conventionally used for such absorbent articles can be used without particular limitation. For example, as the front sheet 21, various nonwoven fabrics, perforated films, etc. can be used, and as the back sheet 22, a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used. The absorbent core 231 is a deposit of core-forming material comprising an absorbent material. As the absorbent material, those commonly used as materials for forming such absorbent cores can be used without particular limitation, and examples thereof include wood pulp, hydrophilic fibers such as synthetic fibers treated with a hydrophilizing agent, or water-absorbing polymers. matter particles. That is, the absorptive core 231 may be a fiber stack of hydrophilic fibers, or a fiber stack that supports water-absorbent polymer particles. As the core wrapping material 232, a liquid-permeable sheet such as paper and nonwoven fabric can be used. As shown in FIGS. 2 and 3 , on the left and right sides of the skin-facing surface of the absorbent body 2 along the longitudinal direction X, a leak-proof cuff forming sheet including liquid-repellent or water-repellent and air-permeable is provided 25 One pair of leak-proof flanges 24, 24. In the vicinity of the free end portion of each leak-proof cuff 24, one or more linear elastic members 26 for forming the leak-proof cuff are arranged in the longitudinal direction X in an extended state. The leak-proof cuff 24 stands up at least at the lower crotch portion B as the elastic member 26 disposed in an extended state contracts when the diaper 1A is worn, thereby preventing excretion such as urine from flowing out to the outside in the lateral direction Y. The outer body 3 makes the outer shape of the diaper 1A of the unfolded and elongated state as shown in Figure 2 to be formed, and the periphery of the outer body 3 forms the outline of the diaper 1A of this state, namely the abdominal part A, the lower part of the crotch B and the back part C The outlines of each. As shown in FIG. 2 , the outer body 3 is formed into a rectangular shape in which the length of the lateral direction Y is longer than the length of the longitudinal direction X in the ventral part A and the back part C, and the crotch part B between the ventral part A and the back part C is formed. , the side edges of the outer body 3 along the longitudinal direction X, that is, a pair of leg edges LS, LS are curved toward the center of the transverse direction Y in the shape of an arc, and the vertical direction X is formed under the top view as shown in Figure 2. The central area is hourglass-shaped inwardly retracted toward the inner side of the horizontal Y. As shown in FIGS. 3 to 5 , the outer body 3 includes the outer layer sheet 31 that forms the outer surface of the diaper 1A in the wearing state, that is, the non-skin-facing surface, and the skin-facing surface disposed opposite to the outer layer sheet 31. It consists of a laminated body of the inner layer sheet 32 . In the wearing state of the diaper 1A, the outer sheet 31 is located on the side away from the wearer's body, forming the non-skin-facing surface (outer surface) of the diaper 1A, and the inner sheet 32 is located on the side close to the wearer's body, forming the diaper 1A The skin-facing side (inner surface). The outer layer sheet 31 and the inner layer sheet 32 are bonded to each other by a bonding method such as an adhesive at a specific location. As shown in FIG. 4 and FIG. 5 , the outer layer sheet 31 has a folded portion 31E on the ventral portion A and the back portion C, and the folded portion 31E extends from the end edge of the longitudinal direction X of the inner layer sheet 32 and extends toward the back. When the skin-opposing surface side of the inner layer sheet 32 is folded back, as shown in FIGS. 2 and 4 , the folded-back portion 31E covers the end of the longitudinal direction X of the absorptive body 2 . In this embodiment, as shown in FIG. 5 , the inner layer sheet 32 is composed of one continuous sheet, while the outer layer sheet 31 is composed of a combination of a plurality of sheets. It is composed of the following sheets: the abdominal outer layer sheet 31A that constitutes the abdominal part A, the back outer layer sheet 31C that constitutes the back part C, and the crotch part that is positioned between the two sheets 31A, 31C to constitute the crotch part B Outer layer sheet 31B. Each of the sheets 31A, 31B, 31C constituting the outer sheet 31 is such that the ends in the longitudinal direction X thereof overlap each other, and the overlapping portions are joined by known bonding methods such as adhesive, heat sealing, high frequency sealing, ultrasonic sealing, etc. to integrate with each other. In the overlapping portions of the sheets 31A, 31C and the sheet 31B, respectively, the sheet 31B located at the center of the longitudinal direction X is located on the relatively near side from the absorbent body 2, and the two ends of the longitudinal direction X of the sheet 31B are not. The skin-opposing surface is covered with sheets 31A and 31C. The sheets 31 ( 31A, 31B, 31C) and 32 constituting the outer casing 3 may be of the same type or of different types, and examples of the latter include forms with different stretchability. Specifically, for example, a stretchable sheet having stretchability in the transverse direction Y can be used for the abdominal outer sheet 31A and the back outer sheet 31C, and the crotch outer sheet 31B is the remainder of the outer sheet 31. As the inner layer sheet 32, a non-stretchable sheet having no stretchability is used. As a stretchable sheet that can be used for the outer casing 3, for example, a stretchable sheet in which an extensible fiber layer is integrated on both sides or one side of an elastic fiber layer can be mentioned, as the elastic fiber layer and the extensible fiber layer. The method of integration includes, for example, a method of laminating the two layers and interlaced with water, a method of interlacing fibers by hot air, etc., and a method of joining by heat embossing, adhesive, ultrasonic wave, etc. . In addition, as the non-stretchable sheet that can be used for the outer body 3, for example, nonwoven fabrics obtained by various production methods can be exemplified, and specifically, spunbond nonwoven fabrics, hot air nonwoven fabrics, and needle punched nonwoven fabrics can be exemplified. As shown in FIGS. 1 , 2 , 4 and 5 , in each of the abdominal part A and the back part C, a plurality of linear or belt-shaped waist elastic members 33 are arranged in an extended state in the lateral direction Y, The plurality of waist elastic members 33 are intermittently arranged at predetermined intervals in the longitudinal direction X. As shown in FIG. By arranging the waist elastic member 33 in such a state that its elastic elasticity is exhibited, an annular waist gather that is substantially continuous over the entire circumference is formed at the opening edge of the waist opening WH. In addition, one leg elastic member 34 for forming a linear or belt-shaped leg gathers is arranged in an extended state in the leg edge portion LS forming the opening edge portion of each of the pair of leg openings LH and LH. Or a plurality of them, thereby forming an annular leg gather that is substantially continuous over the entire circumference of the opening edge of each of the pair of leg openings LH and LH. These elastic members 33 and 34 are both sandwiched and fixed between the outer layer sheet 31 and the inner layer sheet 32 constituting the outer casing 3 by a bonding method such as an adhesive. The sweat absorbing sheet 10 is disposed at a site where the diaper 1A may come into contact with the wearer's skin when wearing the diaper 1A. In the present embodiment, as shown in FIGS. 2 and 4 , the sweat-absorbing sheet 10 is placed on the skin-facing surface of the folded-back portion 31E of the outer-layer sheet 31 in a stacked manner. More specifically, the sweat-absorbing sheet 10 has a shape that is long in one direction in plan view, specifically, a rectangular shape, the longitudinal direction of which is consistent with the lateral direction Y, and is located between the abdominal part A and the back part C. The waist part D and the waist part E are arranged over the entire length of the transverse direction Y of the diaper 1A so as to form the outermost surface of the inner surface side (skin-opposing surface side) of the diaper 1A, which is the position closest to the wearer's skin. Furthermore, the waist D is the part located around the waist of the wearer, which is usually from the end of the longitudinal direction X of the abdominal part A side or the back part C side of the diaper 1A to 1 to 15% of the total length of the longitudinal direction X of the diaper 1A. area of length. Moreover, the waist part E is the area|region located between the waist part D of each of the abdominal part A and the back part C and the lower crotch part B. As shown in FIG. 4, the sweat absorbing sheet 10 has the 1st layer 10A closest to the wearer's skin, and the 2nd layer 10B overlapping and arrange|positioned on the non-skin opposing surface of this 1st layer 10A. The first layer 10A and the second layer 10B are joined by a known joining method such as an adhesive or fusion. The first layer 10A and the second layer 10B have the same shape and size in plan view, and the entire area of one surface of one is covered by one surface of the other. In FIG. 6 , the surface on the side of the first layer 10A of the sweat-absorbent sheet 10 is shown, that is, the skin-facing surface of the sweat-absorbent sheet 10 , and in FIG. 7 , a cross-section in the thickness direction of the sweat-absorbent sheet 10 is shown. change. In the diaper 1A, the first layer 10A is composed of a partially hydrophilic non-woven fabric, and in the plan view of the first layer 10A shown in FIG. There are hydrophobic regions 12 around each of the hydrophilic regions 11 . The hydrophobic region 12 is in a continuous state in a plan view of the first layer 10A, and surrounds the plurality of hydrophilic regions 11 respectively. As shown in FIG. 7 , the plurality of hydrophilic regions 11 exist over the entire length of the sweat-absorbent sheet 10 in the thickness direction, respectively. Furthermore, the above-mentioned "the hydrophobic region 12 exists around each of the plurality of hydrophilic regions 11" includes the form in which the hydrophobic region 12 exists around all the hydrophilic regions in the plurality of hydrophilic regions 11, and a part of the plurality of hydrophilic regions 11. A form in which the hydrophobic region 12 exists around the hydrophilic region (a form in which the hydrophobic region 12 does not exist around the other hydrophilic regions 11 except for the part of the hydrophilic region). From the viewpoint of achieving the specific effects of the present invention more reliably, the hydrophilic area of the hydrophobic area 12 exists around the total number of the hydrophilic areas 11 present on the skin-opposing surface of the sweat absorbent sheet 10 (the surface of the first layer 10A). The ratio of the number of the regions 11 is preferably more than 80%, more preferably 100%, that is, there are hydrophobic regions 12 around all the hydrophilic regions in the plurality of hydrophilic regions 11 . In addition, the above-mentioned "around (each) of the hydrophilic region 11" refers to the vicinity of the hydrophilic region 11 in the range where the sweat-absorbent sheet 10 (the first layer 10A) exists (the range where the hydrophobic region 12 may exist). For example, referring to FIG. 2 , when the hydrophilic region 11 extends from one end to the other end of the transverse direction Y in the central portion of the longitudinal direction X of the first layer 10A, “around the hydrophilic region 11 ” does not include the portion of the hydrophilic region 11 . The two outer sides of the lateral direction Y, that is, the two outer sides of the lateral direction Y of the first layer 10A. In the first layer 10A shown in FIG. 6 , a plurality of hydrophilic regions 11 that are elongated in one direction in a plan view, specifically rectangular, are the longitudinal directions X and the transverse directions consistent with the transverse direction Y. Y these are discontinuous configurations in both directions. Furthermore, focusing on a vertical row of hydrophilic regions in which a plurality of hydrophilic regions 11 are intermittently arranged in the vertical direction X, an arbitrary vertical row of hydrophilic regions, and another hydrophilic region adjacent to the vertical row of the arbitrary hydrophilic regions in the horizontal direction Y. In the vertical row of regions, the positions in the vertical direction X of the hydrophilic regions 11 constituting the same are the same. Furthermore, in FIG. 6, only the skin-opposing surface of the first layer 10A is shown, but the non-skin-opposing surface located on the opposite side of the skin-opposing surface, that is, the second layer 10B is the opposite surface, The hydrophilic region 11 is also present in the position corresponding to the hydrophilic region 11 of the skin-opposing surface, and the hydrophilic region 11 and the hydrophobic region 12 are mixed in the same manner as the skin-opposing surface. The first layer 10A, which is a partially hydrophilic nonwoven fabric, is obtained by partially adhering a hydrophilizing agent to a nonwoven fabric (hydrophobic nonwoven fabric) composed of hydrophobic fibers, and even if the hydrophilizing agent partially adheres to a sheet-like nonwoven fabric, The hydrophilic region 11 is the attachment portion of the hydrophilizing agent. This point is in contrast to, for example, the sweat-absorbent sheets described in Patent Documents 2 and 3 in which the sweat-absorbent sheet has a mixed layer in which hydrophilic fibers and hydrophobic fibers are mixed, and by distributing in the mixed layer Sweat is absorbed by the perspiration effect of each one of a large number of hydrophilic fibers. Since the hydrophilic region 11 having a sweat absorbing effect in the first layer 10A is formed by attaching a hydrophilizing agent to the nonwoven fabric, it usually has an area larger than one fiber or an aggregate of several fibers. The first layer 10A can be produced by attaching a hydrophilizing agent to a nonwoven fabric (base nonwoven fabric) composed of hydrophobic fibers. The method for attaching the hydrophilizing agent to the base non-woven fabric is not particularly limited, as long as it is a method that can partially attach the hydrophilizing agent to the base non-woven fabric, for example, coating or spraying of a coating liquid containing the hydrophilizing agent is exemplified . As the base nonwoven fabric of the first layer 10A, one that can be used as a constituent member of absorbent articles such as a surface sheet can be used without particular limitation. Non-woven fabric, spunlace non-woven fabric, needle-punched non-woven fabric, etc. From the viewpoint of skin feel, etc., spunbond nonwovens and hot air nonwovens are particularly preferred. The hydrophobic fibers, which are the constituent fibers of the base nonwoven fabric of the first layer 10A, do not contain a hydrophilizing agent such as a surfactant, and are not treated with a hydrophilizing agent at least at the point before the hydrophilizing agent for forming a hydrophilic portion is attached. Those treated by hydrophilization, such as plasma treatment, etc., are originally hydrophobic fibers. As the hydrophobic fibers, fibers (hot-melt fibers) composed of various thermoplastic resins can be used. Examples of thermoplastic resins include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polyamides such as nylon 6 and nylon 66, polyacrylic acid, polyalkyl methacrylate, polyamide, etc. Vinyl chloride, polyvinylidene chloride, etc.; one of them may be used alone, or two or more of them may be used in combination. The hydrophobic fibers can be either short fibers or long fibers. As the hydrophobic fiber, a core-sheath type or a side by side type composite fiber, a cut fiber, a special-shaped cross-section fiber, a heat-shrinkable fiber, or the like can also be used. The content rate of the hydrophobic fibers in the above-mentioned base nonwoven fabric is at least 50 mass % or more, usually substantially 100 mass %. In the sweat-absorbent sheet 10, the first layer 10A is a partially hydrophilic nonwoven fabric, and the second layer 10B is constituted by a hydrophilic nonwoven fabric. That is, the second layer 10B does not have a hydrophobic region, but is a hydrophilic region as a whole. As the hydrophilic nonwoven fabric constituting the second layer 10B, as long as the hydrophilic fibers are used as the constituting fibers, nonwoven fabrics obtained by various production methods can be used without particular limitations. For example, the same base nonwoven fabric as the base nonwoven fabric of the first layer 10A can be used. Not woven. Further, as the hydrophilic fibers, those obtained by subjecting hydrophobic fibers that can be used as constituent fibers of the base nonwoven fabric of the first layer 10A to a hydrophobic treatment can be used. Specifically, for example, hydrophobic fibers kneaded with a hydrophilizing agent can be used. Fibers, hydrophobic fibers with hydrophilizing agents attached to the surface, etc. In addition, fibers originally having hydrophilic properties, such as natural or semi-natural fibers such as cellulose fibers, can also be used. As the hydrophilic nonwoven fabric constituting the second layer 10B, one obtained by subjecting the entire base nonwoven fabric of the first layer 10A to a hydrophilization treatment such as treatment with a hydrophilizing agent or plasma treatment can also be used. In the present invention, whether the sheet or a partial region thereof is hydrophilic or hydrophobic is judged based on the contact angle of the fibers measured by the following method. Specifically, if the contact angle of the fiber is less than 90 degrees, it is hydrophilic, and if it is 90 degrees or more, it is hydrophobic. The smaller the contact angle of the fiber measured by the following method, the higher the hydrophilicity (lower the hydrophobicity), and the larger the contact angle, the lower the hydrophilicity (the higher the hydrophobicity). For example, in the sweat-absorbent sheet 10, the hydrophilic region 11 of the first layer 10A is the region where the contact angle of the fibers measured by the following method is less than 90 degrees, and the hydrophobic region 12 is the region where the contact angle is 90 degrees or more. In addition, the contact angle of the fibers of the second layer 10B as a whole measured by the following method was less than 90 degrees. <Measuring method of contact angle> The sheet (non-woven fabric) to be measured is placed so that the cross section in the thickness direction of the measurement object becomes the upper surface, and the thickness direction of the sheet is from the outermost surface of the sheet to 1/10 of the thickness. A plurality of samples are randomly taken from the fibers in the interval, and the contact angle of water is measured. As the measuring device, an automatic contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. was used. The contact angle was measured using distilled water. The amount of liquid ejected from the water droplet ejection unit of the inkjet method (manufactured by Cluster Technology, a pulse ejector CTC-25 with an ejection portion aperture of 25 μm) was set to 15 picoliters, so that the water droplets fell directly above the center of each fiber. . The water droplets are recorded to a high-speed video recording device connected to a horizontally set camera. From the viewpoint of image analysis later, the video recording device is preferably a personal computer equipped with a high-speed capture device. In this assay, image recording was performed every 17 msec. In the recorded images, use the supporting software FAMAS (the software version is 2.6.2, the analysis method is the droplet method, the analysis method is the θ/2 method, the image processing algorithm is no reflection, the image processing image mode is For the frame, the threshold level is 200, and no curvature correction is performed.) Perform image analysis on the initial image of the water droplet falling on the fiber, calculate the angle formed by the water droplet-air contact surface and the fiber, and use it as the contact angle. The fibers were cut to have a fiber length of about 1 mm, and the fibers were placed on the sample stage of the contact angle meter and kept horizontal. The contact angle of 5 fiber samples (N=5) was measured with an accuracy of 1 digit after the decimal point, and the value obtained by averaging the measured values of a total of 10 parts (rounded off to the 1st digit after the decimal point) was defined as the contact angle. Horn. The lower the contact angle, the higher the hydrophilicity. The measurement environment was set at a room temperature of 22±2°C and a humidity of 65±2%RH. Furthermore, when the constituent members (for example, the sweat-absorbing sheet) are extracted from the absorbent article for evaluation and measurement, if the constituent members are fixed to other constituent members by adhesive, fusion, etc., they may not be fixed. The fixed part is removed for measurement, or the fixed part is removed for extraction. In this case, from the viewpoint of minimizing the influence of the hydrophilizing agent attached to the constituent members, as a method for removing the fixed portion, it is preferable not to use a coating solvent or to use hot air blowing with a dryer. A method for the risk of deterioration and loss of oil. 99% by mass or more of the "sweat" that the sweat-absorbing sheet should absorb is water. Therefore, in order to make the sweat-absorbing sheet practically exhibit sufficient sweat-absorbing properties in an absorbent article, it is necessary to make it at least as much as possible with the secretion of sweat. The skin-opposite side of the sweat-absorbent sheet that is in contact with the wearer's skin has hydrophilicity. However, if the entire skin-opposing surface of the sweat-absorbing sheet is hydrophilic, a layer containing sweat liquid is likely to be formed over a wide area between the skin-opposing surface and the skin, resulting in a decrease in the dry feeling felt by the skin. , it is easy to cause skin problems such as sweat rash. In this regard, in the sweat-absorbent sheet 10, the first layer 10A that may be in contact with the skin of the wearer of the diaper 1A is a part of the hydrophilic nonwoven fabric having the hydrophobic region 12, so that the dry feeling felt by the skin is improved, Not easy to cause skin problems. On the other hand, if the sweat-absorbing sheet is partially hydrophilic, there is a possibility that the sweat-absorbing function may be lowered. However, in the sweat-absorbing sheet 10, the non-skin-opposing surface of the first layer 10A is superimposed on the non-skin-facing surface of the first layer 10A. Since the second layer 10B is composed of a hydrophilic nonwoven fabric excellent in absorbency and liquid diffusivity, this concern is eliminated. That is, in the sweat-absorbing sheet 10, the first layer 10A that is closer to the wearer's skin is in the hydrophobic region 12 of the skin-opposing surface side as shown in FIG. The part of the hydrophilic non-woven fabric, therefore, the sweat will not diffuse in the surface direction in the first layer 10A, but will quickly migrate to the hydrophilic non-woven fabric of the second layer 10B and widely diffuse in the surface direction. In this way, by laminating the first layer 10A, which is a partially hydrophilic nonwoven fabric with low diffusivity in the surface direction, and the second layer 10B, which has high liquid diffusivity, a "gradient of liquid diffusivity" is imparted in the thickness direction, Thereby, the small perspiration droplets adhering to the wearer's skin at the beginning of exudation can be quickly absorbed in the hydrophilic region 11 of the first layer 10A, and spread over the entire area of the second layer 10B on the opposite side of the skin. In particular, the hydrophilic region 11 having the function of absorbing sweat in the first layer 10A is a relatively small area surrounded by the hydrophobic region 12 lacking liquid diffusivity, which can be said to be a "straw" for absorbing sweat. Sweat absorbed in the region 11 is difficult to diffuse in the surface direction of the first layer 10A, and will travel rapidly in the thickness direction through the first layer 10A, reaching the hydrophilic second layer 10B as a whole, and along the surface of the second layer 10B The direction diffuses and is absorbed and retained. That is, the first layer 10A mainly plays the role of transferring sweat to the second layer 10B, and the second layer 10B mainly plays the role of absorbing and retaining the sweat that has migrated from the first layer 10A. It can quickly absorb the sweat existing on the wearer's skin and spread it away from the skin. Moreover, by spreading sweat only in the second layer 10B widely in the surface direction, the surface area of the sweat is brought into contact with the air, whereby the sweat can be quickly evaporated. As a result, the occurrence of skin problems such as sweat rash can be effectively prevented. The contact angle of the hydrophilic region 11 measured by the above-described method is preferably 80 degrees or less, and more preferably 70 degrees or less, from the viewpoint of allowing sweat to move more quickly through the hydrophilic region 11 of the first layer 10A. From the same viewpoint, the hydrophilicity of the hydrophilic region 11 of the first layer 10A, which is relatively close to the wearer's skin, is preferably the hydrophilicity of the second layer 10B (hydrophilic non-woven fabric), which is relatively far from the wearer's skin. The same or higher than the hydrophilicity of the second layer 10B. That is, when the contact angle measured by the above method is used as an index of hydrophilicity, the contact angle of the hydrophilic region 11 of the first layer 10A is preferably equal to or smaller than that of the second layer 10B, which is a hydrophilic nonwoven fabric. the contact angle.

The difference between the contact angle of the hydrophilic region 11 and the contact angle of the second layer 10B, in terms of the latter - the former, is preferably 5 degrees or more, more preferably 10 degrees or more, and more preferably 30 degrees or less, and more preferably Below 40 degrees.

The contact angle of the second layer 10B is preferably 85 degrees or less, and more preferably 83 degrees or less.

As described above, the hydrophilic region 11 of the first layer 10A can be obtained by attaching the hydrophilizing agent to the hydrophobic nonwoven fabric. In this case, the hydrophilicity of the hydrophilic region 11 can be adjusted by appropriately adjusting the type, concentration, viscosity, printing pressure, temperature, and coating speed of the used hydrophilizing agent. Contact angle determined by the above method. Specifically, for example, if the hydrophilicity of the hydrophilizing agent existing in the hydrophilic region 11 is equal to or more than the hydrophilicity of the hydrophilizing agent existing in the second layer 10B, the hydrophilic region 11 can be made as described above. The contact angle is equal to or smaller than the contact angle of the second layer 10B.

The adhesion amount of the hydrophilizing agent in the first layer 10A is preferably 0.01 mass % or more, more preferably 0.1 mass % or more, in terms of the ratio of the solid content to the total mass of the first layer 10A, and further, Preferably it is 5 mass % or less, More preferably, it is 1 mass % or less.

From the viewpoint of making sweat move more rapidly from the first layer 10A to the second layer 10B, the distance between fibers of the second layer 10B is preferably equal to or smaller than the distance between fibers of the first layer 10A. Generally speaking, the shorter the inter-fiber distance between the constituent fibers, the stronger the capillary force, so that in the sweat-absorbent sheet 10, the inter-fiber distance of the second layer 10B located on the side relatively far from the wearer's skin is smaller than that of the second layer 10B. The distance between the fibers of the first layer 10A relatively increases the capillary force of the second layer 10B, thereby enabling further Increases the movement speed in the direction of the thickness of sweat.

The difference between the distance between the fibers of the first layer 10A and the distance between the fibers of the second layer 10B, in terms of the former and the latter, is preferably 5 μm or more, more preferably 15 μm or more, and more preferably 35 μm or less, still more preferably 30μm or less. If the difference in the distance between the two fibers is too large, the capillary force in the first layer 10A decreases and the sweat absorption capacity in the second layer 10B decreases, resulting in a decrease in sweat absorbing performance. The distance between fibers can be obtained by the following formula (1).

In the formula, L represents the thickness (cm) of the sheet (the first layer 10A, the second layer 10B), W represents the basis weight (g/m ² ) of the sheet, and Di represents the amount of the constituent fibers i constituting the sheet. Fiber Danny, αi represents the weight ratio (%) of the constituent fiber i.

From the same viewpoint, the basis weight of the first layer 10A is preferably small, and the thickness of the first layer 10A is preferably small.

The basis weight of the first layer 10A is preferably 20 g/m ² or less, and more preferably 17 g/m ² or less. In addition, the lower limit of the basis weight of the first layer 10A is preferably 9 g/m ² or more, and more preferably 10 g/m ² or more, from the viewpoint of ensuring sufficient strength for practical use.

The thickness of the first layer 10A is preferably 0.19 mm or more, more preferably 0.20 mm or more, and more preferably 0.7 mm or less, and more preferably 0.5 mm or less.

Moreover, it is preferable that the basis weight of the second layer 10B is equal to or greater than the basis weight of the first layer 10A from the viewpoint of increasing the capacity of sweat absorbed by the sweat absorbing sheet 10 and also being able to cope with a large amount of sweat.

Moreover, from the same viewpoint, the thickness of the second layer 10B is preferably equal to or greater than the thickness of the first layer 10A.

The method of measuring the thickness is to use a thickness measuring device in a state where a load of 0.05 kPa is applied to the nonwoven fabric to be measured. As the thickness measuring device, a laser displacement gauge manufactured by OMRON Corporation was used. In the thickness measurement, the thicknesses of 10 locations were measured, and the average value thereof was calculated as the thickness. The difference between the basis weight of the first layer 10A and the basis weight of the second layer 10B is preferably 1 g/m ² or more, more preferably 2 g/m ² or more, and more preferably 11 g/m 2 or more in terms of the latter minus the former. g/m ² or less, more preferably 10 g/m ² or less. The basis weight of the second layer 10B is preferably 10 g/m ² or more, more preferably 13 g/m ² or more, and more preferably 23 g/m ² or less, more preferably 22 g/m ² or less . The difference between the thickness of the first layer 10A and the thickness of the second layer 10B, in terms of the latter - the former, is preferably 0.05 mm or more, more preferably 0.1 mm or more, and more preferably 0.5 mm or less, and more preferably 0.4 mm mm or less. The thickness of the second layer 10B is preferably 0.1 mm or more, more preferably 0.15 mm or more, and more preferably 0.4 mm or less, and more preferably 0.5 mm or less. As described above, in order to suppress skin problems such as hiccups, it is necessary to absorb sweat quickly, spread the sweat away from the wearer's skin, and quickly evaporate the sweat so that the wearer's skin is always kept dry. From this viewpoint, the area of each of the plurality of hydrophilic regions 11 in the first layer 10A is preferably 1 cm ² or less, and more preferably 0.9 cm ² or less. In addition, the lower limit of the area of the hydrophilic region 11 is preferably 0.01 cm ² or more, more preferably 0.02 cm ² or more, from the viewpoint of securing the minimum size that can exert its function. The area of the hydrophilic region is determined by the following method. <Measurement method of the area of the hydrophilic region> Coloring water was prepared by mixing and dissolving a dye such as blue No. 1 or red No. 2 in distilled water so that the concentration of the dye was 0.01% by weight. The sweat-absorbing sheet to be measured was cut out from the absorbent article, and immediately taken out after being immersed in colored water. The outline of the diffusion area of the coloring water on the first layer of the sweat-absorbing sheet (the side facing the skin when placed on an absorbent article) is photoprinted onto a transparent OHP film, etc., and an image analysis is used based on the outline obtained by the transfer. The device calculates the diffusion area of the colored water, and uses the calculated value as the area of the hydrophilic region. In addition, although the area of each of the plurality of hydrophilic regions 11 is set within the above-mentioned range, and the moving speed of the liquid in the thickness direction of each hydrophilic region 11 is increased, such hydrophilic regions 11 are located in a specific part of the first layer 10A. If it exists in a high ratio, the ratio of the area of sweat and skin contacting becomes high, and there exists a possibility that a skin problem cannot be suppressed fully. From this viewpoint, the area ratio of the hydrophilic region 11 in the first layer 10A is preferably 20% or less, and more preferably 15% or less. In addition, the lower limit of the area ratio of the hydrophilic region 11 is preferably 5% or more, and more preferably 8% or more, from the viewpoint of securing the minimum size that can exert its function. The so-called "area ratio of hydrophilic regions" here refers to the ratio of the total area of the hydrophilic regions 11 existing in a unit region to the area of the unit region. The area that looks down on the quadrilateral shape. In addition, although the area of each of the plurality of hydrophilic regions 11 is set within the above-mentioned range, and the moving speed of the liquid in the thickness direction of each hydrophilic region 11 is increased, such hydrophilic regions 11 are located in a specific part of the first layer 10A. If a plurality of high-density existing regions exist, the high-density existing region of the hydrophilic region 11 itself becomes substantially one hydrophilic region, thereby improving the liquid diffusivity in the surface direction, and as a result, the liquid moving speed in the thickness direction may decrease instead. . Therefore, it is necessary to provide the interval between the hydrophilic regions 11 to a certain extent, but if the interval is too large, the number of the hydrophilic regions 11 existing in the first layer 10A may decrease, resulting in a decrease in sweat absorption. From this point of view, the distance between the two adjacent hydrophilic regions 11 and 11 with the hydrophobic region 12 interposed therebetween is represented by the distance Lx (see FIG. 6 ) in the longitudinal direction X corresponding to the front-back direction of the wearer of the diaper 1A. , preferably 5 mm or more, more preferably 6 mm or more, and more preferably 20 mm or less, more preferably 15 mm or less. Further, in the lateral direction Y, the interval Ly (refer to FIG. 6 ) is preferably 1 mm or more, more preferably 2 mm or more, and more preferably 10 mm or less, and more preferably 9 mm or less. As described above, if a layer containing sweat liquid is formed between the skin of the wearer of the diaper 1A and the skin-opposing surface of the sweat absorbing sheet 10 , that is, the first layer 10A, skin problems such as sweat rash may occur. The inventors of the present invention have conducted various studies focusing on the residual amount of liquid on the surface of the sweat-absorbent sheet measured by the following method as an index of the formation of the liquid layer. As a result, they found the following tendency: The first layer 10A The higher the hydrophilicity of the hydrophilic region 11, the less the residual liquid on the surface of the sweat-absorbent sheet, and the easier the layer containing sweat liquid between the first layer 10A and the wearer's skin is far away from the skin. As described above, the hydrophilicity (contact angle) of the hydrophilic region 11 of the first layer 10A can be adjusted by appropriately adjusting the type or concentration of the hydrophilizing agent present in the hydrophilic region 11 as a method of improving the hydrophilicity of the hydrophilic region 11 For example, the method of using a highly hydrophilic thing as a hydrophilizing agent is mentioned. <Method for measuring the amount of residual liquid on the surface> The first layer is produced by partially adhering the hydrophilizing agent to the hydrophobic nonwoven fabric, the first layer and the second layer consisting of the hydrophilic nonwoven fabric are laminated, and the two layers are made of an adhesive. The layers were integrated, and a measurement sample of a sweat-absorbent sheet having a plan view quadrilateral of 50 mm in length and 50 mm in width was produced. As the hydrophobic non-woven fabric, a spunbond non-woven fabric with a basis weight of 13 g/m ² or more is used, and as a hydrophilic non-woven fabric, a spun-bonded non-woven fabric with a basis weight of 15 g/m ² or more is used. The pattern of the hydrophilizing agent in the first layer was set to be the same as that shown in FIG. 6 . Drop 50 mg of test solution (pure water) on the center of an acrylic plate with a total length of 60 mm and a width of 60 mm. Next, the measurement sample was lightly placed on the test liquid dropped on the acrylic plate so that the first layer was directed downward. After 1 minute, remove the test sample that has absorbed the test liquid, use a filter paper with a known weight (W0) to absorb the test liquid remaining on the acrylic plate at this time, and measure the weight of the filter paper after water absorption (W1). Then, by subtracting the weight W0 (W1-W0) from the weight W1, the surface liquid residual amount (mg) of the sample was calculated. In the above <measurement method of residual liquid on the surface>, the test liquid (pure water) dropped on the acrylic plate adhered to the acrylic plate and the first layer 10A as the measurement sample, that is, the partially hydrophilic non-woven fabric, and adhered to the interface. It diffuses upwards, reaches the hydrophilic area 11, and is absorbed into the fibers of the hydrophilic area 11, thereby forming a liquid layer at the interface between the interior of the hydrophilic area 11 and the acrylic sheet by surface tension. Then, the liquid migrates to the second layer and spreads in the surface direction of the second layer, whereby the liquid at the interface is far away from the acrylic sheet, but a part of the liquid does not completely migrate and remains on the acrylic sheet. According to the knowledge of the present inventors, the higher the hydrophilicity of the hydrophilizing agent used as the material for forming the hydrophilic region 11 in the first layer 10A, the smaller the contact angle of the first layer 10A, and the easier the liquid at the interface is. By moving to the second layer, it becomes less likely to remain on the acrylic sheet side. Based on the above findings, in the present invention, lauryl hydroxysulfobetaine (manufactured by Kao Co., Ltd., trade name "Amphitol 20HD") can be exemplified as a hydrophilizing agent that can be preferably used as a material for forming the hydrophilic region 11 . As described above, the first layer 10A and the second layer 10B constituting the sweat-absorbing sheet 10 are joined by a known joining method such as an adhesive or fusion, and as shown in FIG. junction 13 . Since the junction part 13 is usually hydrophobic, depending on the arrangement pattern of the junction part 13, there is a possibility that the sweat absorbing property of the sweat absorbing sheet 10 or the like may be affected. From this viewpoint, the bonding portion 13 preferably partially overlaps with the hydrophilic region 11 of the first layer 10A, and the hydrophilic region 11 preferably has a portion that does not overlap with the bonding portion 13 . Variations of the joint portion 13 shown in FIGS. 7( a ) to 7 ( c ) are examples of the preferred form. In the form shown in FIGS. 7( a ) to 7 ( c ), the hydrophilic region 11 of the first layer 10A that functions to migrate the liquid and the second layer that absorbs and retains the liquid migrated from the hydrophilic region 11 10B is in close contact via the joint portion 13, and the joint portion 13 does not hinder the movement of the liquid, so the above-mentioned effects of the present invention can be more reliably exhibited. In the form shown in FIG. 7( a ), the bonding portion 13 corresponds to the plurality of hydrophilic regions 11 in the first layer 10A, respectively, and is arranged at the portion overlapping the hydrophilic region 11 in plan view, but in FIG. 7( a ) ) of the sweat-absorbent sheet 10 shown in the cross section along the thickness direction, the width of the joint portion 13 is smaller than the width of the corresponding hydrophilic region 11, therefore, the joint portion 13 and the hydrophilic region 11 are partially overlapped, and the hydrophilic region 11 There is a portion that does not overlap with the joint portion 13 . In the form shown in FIG.7(b), the junction part 13 is arrange|positioned so that the boundary of the hydrophilic area|region 11 and the hydrophobic area|region 12 in the 1st layer 10A may be crossed and its vicinity. In the form shown in FIG. 7( c ), the joint portion 13 is arranged corresponding to the plurality of hydrophobic regions 12 in the first layer 10A, and is arranged between the sweat-absorbing sheet 10 shown in FIG. 7( c ). The width of the joint portion 13 is larger than the width of the corresponding hydrophobic region 12 under the cross-sectional observation along the thickness direction. The whole area overlaps, and further overlaps with a part of the hydrophilic area 11 located around the hydrophobic area 12 , but does not overlap with the entire area of the hydrophilic area 11 . In the sweat-absorbent sheet of the present invention, the pattern of the hydrophilic region in the first layer is not limited to the one shown in FIG. 6, but can be arbitrarily selected within the scope of not departing from the gist of the present invention. Specific examples of the pattern of the hydrophilic region in the first layer are shown in FIGS. 8( a ) to 8 ( c ). In addition, in each form shown in FIG. 8, the structural part different from the 1st layer 10A (refer FIG. 6) of the sweat absorbing sheet 10 is mainly demonstrated, and the same code|symbol is attached|subjected to the same structural part. Description is omitted. For components that are not particularly described, the description about the sweat-absorbent sheet 10 can be appropriately referred to. In the first layer 10A shown in FIG. 8( a ), the plurality of hydrophilic regions 11 are arranged in a zigzag shape. That is, in the first layer 10A shown in FIG. 8( a ), a plurality of hydrophilic regions 11 are arranged intermittently in the vertical direction X and the vertical series of hydrophilic regions are arranged with a specific interval in the horizontal direction Y, and a plurality of hydrophilic regions are arranged, and When the vertical row of hydrophilic regions is projected along the horizontal direction Y, the projected images of the hydrophilic regions 11 that constitute the vertical row of hydrophilic regions are arranged between the projected images of other hydrophilic regions 11 adjacent to the vertical row of hydrophilic regions on the horizontal direction Y. . The pattern of the hydrophilic regions 11 shown in FIG. 6 and the pattern of the hydrophilic regions 11 shown in FIG. 8( a ) are common to the dots where the dotted hydrophilic regions 11 are scattered in a plan view. The special feature of the pattern of the hydrophilic regions 11 shown in FIG. 6 is that the spacing Ly in the lateral direction Y of the hydrophilic regions 11 and 11 is relatively narrow (set to the above-mentioned specific range), so that the self-wearer can be absorbed efficiently. The skin slowly oozes sweat. On the other hand, the special feature of the zigzag pattern of the hydrophilic region 11 shown in FIG. 8(a) is that the sweat secreted from the sweat glands of the wearer’s skin gathers on the skin and becomes droplets of a certain size. stage to efficiently absorb the sweat droplets. In the first layer 10A shown in FIG. 8( b ) and FIG. 8( c ), the hydrophilic regions 11 extending in one direction (specifically, the lateral direction Y) in a plan view are respectively aligned with the one direction. In the intersecting direction (specifically, the vertical direction X), a plurality of them are intermittently arranged. The top view shape of the hydrophilic region 11 is a spiral shape (continuous curve shape) in FIG. 8( b ), a straight line shape in FIG. 8( c ), a so-called spiral pattern in FIG. 8( b ), and a so-called spiral pattern in FIG. 8( c ) The so-called striped pattern. According to the form shown in FIGS. 8( b ) and 8 ( c ), in the portion of the first layer 10A in contact with the wearer’s skin, a plurality of lines extending over the entire length of the lateral direction Y of the contact portion are arranged The shape of the hydrophilic region 11, therefore, can efficiently absorb sweat. Furthermore, when the linear hydrophilic region 11 in plan view as shown in FIG. 8(b) and FIG. 8(c) extends from one end to the other end of the lateral direction Y of the first layer 10A, the hydrophilic region The portion of 11 that is outside of the lateral direction Y compared to both ends of the lateral direction Y is the non-existent area of the first layer 10A (sweat-absorbent sheet 10), not "around the hydrophilic area 11", which is the same as the above-mentioned point. same. In the present invention, the plan view shape of the hydrophilic region in the first layer is not limited to the shape shown in the figure, but can be appropriately selected. If the planar shape of the hydrophilic region 11 is exemplified, point shapes such as circles, ellipses, triangles, quadrilaterals, and hexagons, and linear shapes such as straight lines, curved lines, and broken lines may be mentioned. In addition, the plurality of hydrophilic regions existing on one surface of the first layer may have the same plan view shape or may be different from each other. As a hydrophilizing agent which can be used for the sweat absorbing sheet of this invention, the following are mentioned, for example.・Ether-type nonionic surfactants such as polyoxyethylene alkyl ether, polyoxypropylene alkyl ether, polyoxyethylene alkyl phenyl ether, and polyoxypropylene alkyl phenyl ether.・Polyol ether type nonionic surfactants such as alkyl glycosides.・Ester-type nonionic surfactants such as polyethylene glycol esters, polyoxyethylene fatty acid esters, and polyoxypropylene fatty acid esters.・Polyol ester type nonionic surfactants such as sucrose fatty acid esters, sorbitan fatty acid esters, polyoxyethylene fatty acid esters, and polyoxypropylene fatty acid esters.・Amide-based nonionic surfactants such as fatty acid alkanolamides and alkylene oxide adducts of aliphatic amides having an acyl group having 8 to 18 carbon atoms.・Alkyl ethoxylates, polyethylene glycol dilaurate, polyethylene glycol distearate, alkyl ethoxylated amines.・dimethylsiloxane-methyl (polyoxyethylene) siloxane copolymer, dimethylsiloxane-methyl (polyoxypropylene) siloxane copolymer, dimethylsiloxane-methyl (polyoxyethylene/polyoxypropylene) siloxane copolymer, methyl (polyoxyethylene) polysiloxane copolymer, methyl (polyoxypropylene) polysiloxane copolymer, methyl (polyoxyethylene/ Polyoxypropylene modified silicone such as polyoxypropylene) polysiloxane copolymer and methyl (polyoxyethylene/polyoxybutylene) polysiloxane copolymer. The hydrophilizing agent that can be used for the sweat-absorbent sheet of the present invention is preferably water-insoluble. If a water-insoluble hydrophilizing agent is used, when the sweat-absorbent sheet comes into contact with body fluids such as sweat or urine during the wearing of the absorbent article, the problem of exudation or loss of the hydrophilizing agent is less likely to occur. The water-insoluble hydrophilizing agent means one whose solubility with respect to water at 25° C. measured by the following method is 1 mass % or less. The water-insoluble hydrophilizing agent can be obtained by, for example, making the weight average molecular weight of the hydrophilizing agent 3000 or more, or increasing the chain length of the alkyl chain of the hydrophilizing agent. Examples of the water-insoluble hydrophilizing agent include polyoxyethylene lauryl ether and lauryl hydroxysulfobetaine. <Method for measuring the solubility of the hydrophilizing agent> Add the hydrophilizing agent to 100 g of pure water at 25°C, and stir it with a stirrer or a shaker to dissolve it. The solubility of the hydrophilizing agent relative to water at 25°C. In the absorbent article of the present invention, the sweat-absorbing sheet is disposed at a site that may come into contact with the wearer's skin during wearing. In the diaper 1A, the sheet (barrier sheet) that is independent of the basic constituent members of the absorbent article, such as the absorbent body 2 or the outer body 3 (outer layer sheet 31, inner layer sheet 32), is set as a sweat-absorbing sheet 10. By fixing the sweat-absorbing sheet 10 on a specific part, specifically on the folded portion 31E of the outer sheet 31, it is arranged in the whole area of the waist D corresponding to the waist of the wearer, but the sweat is absorbed. The arrangement form of the flexible sheet is not limited to this. For example, in the absorbent article of the present invention, the basic constituent member required to constitute the main body of the absorbent article may be a sweat-absorbing sheet. For example, in the diaper 1A, the outer body 3 arranged at the waist D and/or the waistline E may be a sweat absorbing sheet, and more specifically, for example, the folded-back portion 31E of the outer sheet 31 or the inner sheet 32 It can also be a sweat-absorbing sheet. Furthermore, when the absorbent article of the present invention is a so-called unfolded disposable diaper, not a shorts-type disposable diaper like the diaper 1A, it may be arranged on the lateral outer side of the absorbent body closest to the wearer's skin. The skin-facing surface of the constituent member (for example, the side sheet, the sheet for forming a leak-proof cuff) at the position, the sweat-absorbing sheet independent of the constituent member is fixed, or the constituent member itself may be the present invention Sweat-absorbent sheet. As mentioned above, although this invention was demonstrated based on embodiment of this invention, this invention is not limited to the said embodiment, It can change suitably. For example, as shown in FIG. 2 , in the underpants-type disposable diaper 1A, the outer body 3 is not divided at the abdominal part A and the back part C, but has a gap between the abdominal part A, the lower crotch part B, and the back part C. Hourglass shape and other continuous shapes, but the present invention is not limited to such a continuous shape. For example, it may be divided into a ventral sheet member placed on the wearer’s ventral side (front side), and a ventral sheet member placed on the wearer’s ventral side (front side). The back sheet member on the wearer's back side (back side), the absorbent body is secured across the two sheet members. The description omitted in the above-mentioned one embodiment and the requirements of only one embodiment can be appropriately applied to each of the other embodiments, and the requirements of each of the embodiments can be appropriately interchanged between the embodiments. With regard to the above-described embodiments of the present invention, the following additional notes are further disclosed. <1> An absorbent article in which a sweat-absorbing sheet is disposed at a site that may come into contact with the wearer's skin during wearing, wherein the sweat-absorbing sheet has a first layer closest to the wearer's skin, and is disposed so as to be overlapped on the wearer's skin. The second layer on the non-skin-facing surface of the first layer has a plurality of hydrophilic regions dispersed in a plan view of the first layer, and there are hydrophobic regions around each of the plurality of hydrophilic regions, and the second layer It is a hydrophilic non-woven fabric. <2> The absorbent article as described in said <1> whose contact angle of the said hydrophilic region is 80 degrees or less. <3> The absorbent article as described in said <1> or <2> whose contact angle of the said hydrophilic region is 70 degrees or less. <4> The absorbent article according to any one of the above <1> to <3>, wherein the contact angle of the hydrophilic region is equal to or smaller than the contact angle of the hydrophilic nonwoven fabric (the second layer). <5> The absorbent article according to the above <4>, wherein the difference between the contact angle of the hydrophilic region and the contact angle of the hydrophilic nonwoven fabric (the second layer) is the latter minus the former, preferably 5 degrees or more , more preferably 10 degrees or more, and more preferably 30 degrees or less, and still more preferably 40 degrees or less. <6> The absorbent article according to any one of the above <1> to <5>, wherein the contact angle of the hydrophilic nonwoven fabric (the second layer) is preferably 85 degrees or less, more preferably 83 degrees or less . <7> The absorbent article according to any one of the above <1> to <6>, wherein the basis weight of the first layer is 20 g/m ² or less. <8> The absorbent article according to any one of the above <1> to <7>, wherein the basis weight of the first layer is 17 g/m ² or less, and preferably 9 g/m ² or more, More preferably, it is 10 g/m ² or more. <9> The absorbent article according to any one of the above <1> to <8>, wherein the basis weight of the second layer is equal to or greater than the basis weight of the first layer. <10> The absorbent article according to the above <9>, wherein the difference between the basis weight of the first layer and the basis weight of the second layer is the latter minus the former, preferably 1 g/m ² or more, and further It is preferably 2 g/m ² or more, more preferably 11 g/m ² or less, and more preferably 10 g/m ² or less. <11> The absorbent article according to any one of the above <1> to <10>, wherein the basis weight of the second layer is preferably 10 g/m ² or more, more preferably 13 g/m ² or more Furthermore, it is preferably 23 g/m ² or less, and more preferably 22 g/m ² or less. <12> The absorbent article according to any one of the above <1> to <11>, wherein the thickness of the first layer is 0.7 mm or less. <13> The absorbent article according to any one of the above <1> to <12>, wherein the thickness of the first layer is 0.5 mm or less, preferably 0.19 mm or more, and more preferably 0.20 mm or more . <14> The absorbent article according to any one of the above <1> to <13>, wherein the thickness of the second layer is equal to or greater than the thickness of the first layer. <15> The absorbent article according to the above <14>, wherein the difference between the thickness of the first layer and the thickness of the second layer is preferably 0.05 mm or more, more preferably 0.1 mm, in terms of the latter minus the former The above, and preferably 0.5 mm or less, more preferably 0.4 mm or less. <16> The absorbent article according to any one of the above <1> to <15>, wherein the inter-fiber distance of the second layer is equal to or smaller than the inter-fiber distance of the first layer. <17> The absorbent article according to the above <16>, wherein the difference between the distance between the fibers of the first layer and the distance between the fibers of the second layer is preferably 5 μm or more in terms of the former and the latter, and more It is preferably 15 μm or more, more preferably 35 μm or less, and still more preferably 30 μm or less. <18> The absorbent article according to any one of the above <1> to <17>, wherein the area of each of the plurality of the above-mentioned hydrophilic regions is 1 cm ² or less, and the area of the above-mentioned first layer in the above-mentioned sweat-absorbent sheet is The area ratio of the above-mentioned hydrophilic region is 20% or less. <19> The absorbent article according to any one of the above <1> to <18>, wherein the area of each of the plurality of the hydrophilic regions in the first layer is 0.9 cm ² or less, and preferably 0.01 cm ² or more, more preferably 0.02 cm ² or more. <20> The absorbent article according to any one of the above <1> to <19>, wherein the area ratio of the hydrophilic region in the first layer is 15% or less, preferably 5% or more, and further Preferably it is 8% or more. <21> The absorbent article according to any one of the above <1> to <20>, wherein the first layer and the second layer are joined to each other via a joining portion, and the joining portion is partially formed with the hydrophilic region Overlapping, the hydrophilic region has a portion that does not overlap with the junction. <22> The absorbent article according to any one of the above <1> to <21>, wherein the interval between the two adjacent hydrophilic regions across the hydrophobic region is in the longitudinal direction corresponding to the front-back direction of the wearer 5 mm or more, and 1 mm or more in the transverse direction perpendicular to the longitudinal direction. <23> The absorbent article according to any one of the above <1> to <22>, wherein the interval between two of the above-mentioned hydrophilic regions adjacent to each other across the above-mentioned hydrophobic region is in the longitudinal direction corresponding to the front-back direction of the wearer It is 6 mm or more, more preferably 20 mm or less, and more preferably 15 mm or less. <24> The absorbent article according to any one of the above <1> to <23>, wherein the interval between the two adjacent hydrophilic regions across the hydrophobic region is in a transverse direction perpendicular to the front-rear direction of the wearer The top is 2 mm or more, and preferably 10 mm or less, and more preferably 9 mm or less. <25> The absorbent article according to any one of the above <1> to <24>, wherein the hydrophilic region in the first layer is formed by attaching a hydrophilizing agent to a hydrophobic nonwoven fabric, that is, it is hydrophobic The attachment part of the hydrophilizing agent in the non-woven fabric. <26> The absorbent article according to the above <25>, wherein the content of the hydrophobic fibers in the hydrophobic nonwoven fabric is preferably 50% by mass or more, and more preferably 100% by mass. <27> The absorbent article according to the above-mentioned <25> or <26>, wherein the adhesion amount of the above-mentioned hydrophilizing agent in the above-mentioned first layer is converted into a ratio of solid content to the total mass of the first layer , it is preferably 0.01 mass % or more, more preferably 0.1 mass % or more, and more preferably 5 mass % or less, still more preferably 1 mass % or less. <28> The absorbent article according to any one of the above <1> to <27>, wherein the hydrophilic region in the first layer or the hydrophilic nonwoven fabric constituting the second layer is adhered with a water-insoluble material. Hydrophilizing agent. <29> The absorbent article according to the above <28>, wherein the water-insoluble hydrophilizing agent is polyoxyethylene lauryl ether or lauryl hydroxysulfobetaine. <30> The absorbent article according to any one of the above <1> to <29>, wherein the absorbent article has a longitudinal direction corresponding to the front-rear direction of the wearer, and a transverse direction perpendicular to the longitudinal direction, and has an arrangement The crotch part of the wearer's crotch part and the abdominal part and the back part extending in the front and rear of the wearer are provided with an absorptive body including an absorber, and an outer body disposed on the non-skin-facing surface side of the absorptive body , the outer layer system is composed of a layered body that forms an outer layer sheet on the outer surface of the absorbent article and an inner layer sheet opposite to the skin-facing surface of the outer layer sheet in a wearing state, and the outer layer sheet is formed. The ventral portion and the back portion have a folded portion, the folded portion is extended from the longitudinal end of the inner layer sheet, and is folded back toward the skin-opposite side of the inner layer sheet, the folded portion will be The longitudinal ends of the above-mentioned absorbent body are covered. <31> The absorbent article according to the above <30>, wherein the outer layer sheet comprises a ventral outer layer sheet constituting the ventral portion, a back outer layer sheet constituting the back portion, and two The crotch outer layer sheet constituting the lower part of the crotch is constituted between the sheets, and the longitudinal end portions of the outer layer sheets constituting the sheets are overlapped with each other and joined to each other at the overlapping portion to be integrated. and the overlapping portion of each of the above-mentioned back outer layer sheets and the above-mentioned crotch outer layer sheet, respectively, the crotch outer layer sheet is located on the side relatively close to the above-mentioned absorbent body, and the longitudinal direction of the crotch outer layer sheet is The non-skin facing surfaces of both ends are covered with the ventral outer layer sheet and the back outer layer sheet. <32> The absorbent article according to the above-mentioned <31>, wherein the abdominal outer layer sheet and the back outer layer sheet are stretch sheets having stretchability in the transverse direction, respectively, the crotch outer layer sheet and the above The inner layer sheets are non-stretchable sheets without stretchability, respectively. <33> The absorbent article according to any one of the above-mentioned <30> to <32>, wherein the sweat-absorbing sheet is disposed on the skin-facing surface of the folded-back portion of the outer-layer sheet so as to be overlapped. <34> The absorbent article according to any one of the above <30> to <33>, wherein the sweat-absorbing sheet has a shape long in one direction in plan view, specifically a rectangular shape, and the longitudinal direction of the The said abdominal part and the said back part are arrange|positioned over the whole length of the horizontal direction of the said absorbent article so that the outermost surface of the inner surface side of the said absorbent article may be formed in accordance with the horizontal direction. [Industrial Applicability] According to the present invention, there is provided an absorbent article that can absorb sweat quickly, diffuse and evaporate it away from the wearer's skin, and is less likely to cause skin problems such as rash.

1A‧‧‧Diaper 2‧‧‧Absorptive body 3‧‧‧Outer body 10‧‧‧Sweat absorbing sheet 10A‧‧‧First layer 10B‧‧‧Second layer 11‧‧‧Hydrophilic area 12‧‧‧ Hydrophobic region 13‧‧‧Joint 21‧‧‧Front sheet 22‧‧‧Back sheet 23‧‧‧Absorber 24‧‧‧Leakproof cuff 25‧‧‧Leakproof cuff forming sheet 26‧ ‧‧Elastic member 31‧‧‧Outer layer sheet 31A‧‧‧Outer layer sheet on ventral side 31B‧‧‧Outer layer sheet on crotch 31C‧‧‧Outer layer on back side 31E‧‧‧Turn-back part 32‧‧‧Inner layer Sheet 33‧‧‧Waist elastic member 34‧‧‧Leg elastic member 231‧‧‧Absorptive core 232‧‧‧Core wrapping material A‧‧‧ Abdominal part AS‧‧‧Side edge part B‧‧‧crotch Lower C‧‧‧Back CS‧‧‧Side Edge D‧‧‧Waist E‧‧‧Waist LH‧‧‧Leg Opening LS‧‧‧Leg Edge Lx‧‧‧Interval Ly‧‧ ‧Interval S‧‧‧Side Seal WH‧‧‧Waist Opening X‧‧‧Vertical Y‧‧‧Transverse

Fig. 1 is a perspective view schematically showing a pant-type disposable diaper as one embodiment of the absorbent article of the present invention. Fig. 2 is a development plan view schematically showing the skin-facing surface side (inner surface side) in the unfolded and extended state of the diaper shown in Fig. 1 . FIG. 3 is a cross-sectional view schematically showing a cross-section taken along the line I-I in FIG. 2 . FIG. 4 is a cross-sectional view schematically showing a cross-section taken along the line II-II of FIG. 2 . Fig. 5 is an exploded perspective view schematically showing the disassembled diaper shown in Fig. 1 . Fig. 6 is a plan view schematically showing the skin-facing surface, which is the side surface of the first layer in an example of the sweat-absorbing sheet of the present invention. FIGS. 7( a ) to 7 ( c ) are each a change in the pattern of the joint in an example of the sweat-absorbing sheet of the present invention, and are cross-sectional views schematically showing a cross-section along the thickness direction of the sheet. FIGS. 8( a ) to 8( c ) are plan views schematically showing the skin-facing surface, which is the first layer side surface in another example of the sweat-absorbing sheet of the present invention, respectively.

10‧‧‧Sweat-absorbing sheet

10A‧‧‧1st Floor

11‧‧‧Hydrophilic area

12‧‧‧Hydrophobic area

Lx‧‧‧interval

Ly‧‧‧Interval

X‧‧‧Vertical

Y‧‧‧horizontal

Claims (33)

An absorbent article comprising a sweat-absorbent sheet disposed at a position that may come into contact with a wearer's skin during wearing, wherein the sweat-absorbent sheet has a first layer closest to the wearer's skin, and is disposed overlying the first layer The second layer on the non-skin-opposing surface of the layer, in the plan view of the first layer, there are dispersed a plurality of hydrophilic regions, and there are hydrophobic regions around each of the plurality of hydrophilic regions, and the second layer is hydrophilic Non-woven fabric; and the area ratio of the hydrophilic region in the first layer is 15% or less and 5% or more. The absorbent article of claim 1, wherein the contact angle of the hydrophilic region is 80 degrees or less. The absorbent article of claim 1, wherein the contact angle of the hydrophilic region is 70 degrees or less. The absorbent article of claim 1, wherein the contact angle of the hydrophilic region is equal to or smaller than the contact angle of the hydrophilic non-woven fabric. The absorbent article according to claim 4, wherein the difference between the contact angle of the hydrophilic region and the contact angle of the hydrophilic nonwoven fabric is the latter - the former being 5 degrees or more and 30 degrees or less. The absorbent article of claim 1, wherein the contact angle of the hydrophilic nonwoven fabric is 85 degrees or less. The absorbent article of claim 1, wherein the basis weight of the first layer is 20 g/m ² or less. The absorbent article of claim 1, wherein the basis weight of the first layer is 17 g/m ² or less and 9 g/m ² or more. The absorbent article of claim 1, wherein the basis weight of the second layer is equal to or greater than the basis weight of the first layer. The absorbent article of claim 9, wherein the difference between the basis weight of the first layer and the basis weight of the second layer is 1 g/m ² or more and 11 g/m ² or less in the latter-the former. The absorbent article according to claim 1, wherein the basis weight of the second layer is 10 g/m ² or more and 23 g/m ² or less. The absorbent article of claim 1, wherein the thickness of the first layer is 0.7 mm or less. The absorbent article according to claim 1, wherein the thickness of the first layer is 0.5 mm or less and 0.19 mm or more. The absorbent article of claim 1, wherein the thickness of the second layer is equal to or greater than the thickness of the first layer. The absorbent article of claim 14, wherein the difference between the thickness of the first layer and the thickness of the second layer is 0.05 mm or more and 0.5 mm or less in the latter-the former. The absorbent article of claim 1, wherein the inter-fiber distance of the second layer is equal to or smaller than the inter-fiber distance of the first layer. The absorbent article according to claim 16, wherein the difference between the inter-fiber distance of the first layer and the inter-fiber distance of the second layer is 5 μm or more and 35 μm or less in terms of the former and the latter. The absorbent article of claim 1, wherein the area of each of the plurality of hydrophilic regions is 1 cm ² or less, and the area ratio of the hydrophilic regions of the first layer in the sweat-absorbent sheet is 20% or less. The absorbent article of claim 1, wherein the area of each of the plurality of hydrophilic regions in the first layer is 0.9 cm ² or less and 0.01 cm ² or more. The absorbent article of claim 1, wherein the first layer and the second layer are joined to each other via a joint portion, and the joint portion partially overlaps the hydrophilic region, and the hydrophilic region has a non-overlapping portion with the joint portion. part. The absorbent article of claim 1, wherein the distance between the two adjacent hydrophilic regions across the hydrophobic region is 5 mm or more in the longitudinal direction corresponding to the front-back direction of the wearer, and in the transverse direction perpendicular to the longitudinal direction 1mm or more. The absorbent article according to claim 1, wherein the distance between two of the hydrophilic regions adjacent to each other across the hydrophobic region is 6 mm or more and 20 mm or less in the longitudinal direction corresponding to the front-back direction of the wearer. The absorbent article according to claim 1, wherein the distance between two of the hydrophilic regions adjacent to each other across the hydrophobic region is 2 mm or more and 10 mm or less in the transverse direction perpendicular to the front-rear direction of the wearer. The absorbent article according to claim 1, wherein the hydrophilic region in the first layer is formed by attaching a hydrophilizing agent to a hydrophobic nonwoven fabric. The absorbent article according to claim 24, wherein the content of the hydrophobic fibers in the hydrophobic nonwoven fabric is 50% by mass or more. The absorbent article of claim 24, wherein the adhesion amount of the hydrophilizing agent in the first layer is 0.01 mass % or more and 5 mass % when converted into a ratio of solid content to the total mass of the first layer %the following. The absorbent article according to claim 1, wherein a water-insoluble hydrophilizing agent is adhered to the hydrophilic region or the hydrophilic nonwoven fabric in the first layer. The absorbent article of claim 27, wherein the water-insoluble hydrophilizing agent is polyoxyethylene Lauryl ether or lauryl hydroxysulfobetaine. The absorbent article according to claim 1, wherein the absorbent article has a longitudinal direction corresponding to the front-rear direction of the wearer and a transverse direction perpendicular to the longitudinal direction, and has a crotch portion disposed in the wearer's crotch and in the front and rear of the wearer's crotch. The extended abdominal part and the back part are provided with an absorptive body including an absorber, and a non-skin-opposite side outer covering arranged on the absorptive body, and the outer covering system is included to form the absorptive body in a wearing state An outer layer sheet on the outer surface of the article and a layered body of an inner layer sheet disposed opposite to the skin-facing surface of the outer layer sheet, and the outer layer sheet has a folded-back portion on the ventral portion and the back portion. The folded portion extends from the longitudinal end of the inner layer sheet and is folded back toward the skin-opposite side of the inner layer sheet, and the folded portion covers the longitudinal end of the absorbent body. The absorbent article according to claim 29, wherein the outer sheet comprises a ventral outer sheet constituting the ventral portion, a back outer sheet constituting the back portion, and a back outer sheet positioned between the two sheets constituting the crotch The lower crotch outer layer sheet is constituted, and the longitudinal end portions of these outer layer sheet constituting sheets are overlapped with each other and joined to each other at the overlapping portion to be integrated. The overlapping portion of each of the materials and the above-mentioned crotch outer layer sheet, respectively, the crotch outer layer sheet is located on the side relatively close to the above-mentioned absorbent body, and the non-skin at both longitudinal ends of the crotch outer layer sheet The opposing surface is covered with the ventral outer layer sheet and the back outer layer sheet. The absorbent article according to claim 30, wherein the abdominal outer sheet and the back outer sheet are stretchable sheets having stretchability in the transverse direction, respectively, the crotch outer sheet and the inner inner sheet. The layer sheets are non-stretchable sheets without stretchability, respectively. The absorbent article according to claim 29, wherein the sweat-absorbing sheet is disposed on the skin-facing surface of the folded-back portion of the outer-layer sheet so as to overlap. The absorbent article according to claim 29, wherein the sweat-absorbing sheet has a shape that is long in one direction in plan view, specifically a rectangular shape, the longitudinal direction of which is the same as the lateral direction, and is located on the ventral side and the back side. The part is arranged over the entire length of the transverse direction of the absorbent article so as to form the outermost surface on the inner surface side of the absorbent article.

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