Absorbent articles

Abstract

To provide an absorbent article that can suppress skin problems caused by sweat while also suppressing skin problems caused by moisture loss. [Solution] The absorbent article 1 comprises an abdominal portion 3 that covers the wearer's abdomen, a dorsal portion 2 that covers the back, and an absorbent body 4 that covers the groin area and includes an absorbent material. The front and rear ends of the absorbent body 4 in the longitudinal direction extend to the central portion in the width direction of the abdominal portion 3 and dorsal portion 2, respectively. The absorbent article 1 further comprises a sweat-absorbing sheet 46 disposed on the skin-contact surface 3S or 2S of the abdominal portion 3 or dorsal portion 2, and a moisturizing agent SC disposed on the skin-contact surface 3S or 2S of the abdominal portion 3 or dorsal portion 2.

Description

[Technical Field]

[0001] This invention relates to absorbent articles. [Background technology]

[0002] Absorbent articles equipped with sweat-absorbing sheets to improve sweat evaporation have been disclosed. For example, Patent Document 1 discloses a disposable diaper in which an absorbent body is provided in the center of the disposable diaper, extending from the dorsal side to the ventral side, and a hydrophilic sheet is provided on the waist flap. The hydrophilic sheet has an inner hydrophilic sheet that forms the skin-contacting surface and an outer hydrophilic sheet provided on the non-skin-contacting side of the inner hydrophilic sheet. These sheets are provided in the waist region, which includes the area between the edge of the waist flap on the dorsal side and the edge of the absorbent body. Gathers are formed on the waist flap, which includes the outer hydrophilic sheet and the inner hydrophilic sheet, by a waist elastic member provided inside the waist flap in a state that is stretched in the width direction of the disposable diaper. The outer hydrophilic sheet has higher liquid diffusion properties than the inner hydrophilic sheet. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2010-246901 [Overview of the project] [Problems that the invention aims to solve]

[0004] According to Patent Document 1, the hydrophilic sheet functions as a sweat-absorbing sheet, absorbing sweat on the inner hydrophilic sheet on the skin side and releasing sweat from the outer hydrophilic sheet on the non-skin side. In other words, the hydrophilic sheet promotes the transfer of sweat from the inside to the outside of the disposable diaper. As a result, according to Patent Document 1, the hydrophilic sheet can suppress skin problems such as eczema, heat rash, and rashes caused by sweat.

[0005] However, hydrophilic sheets absorb sweat from the skin and release it to the non-skin side, but at the same time, they also absorb moisture from the skin. As a result, they may cause skin problems such as dryness, loss of sebum, cracking, and eczema.

[0006] Therefore, the object of the present invention is to provide an absorbent article that can suppress skin problems caused by sweat while also suppressing skin problems caused by moisture loss. [Means for solving the problem]

[0007] An absorbent article having mutually orthogonal longitudinal, widthwise, and thicknesswise directions, comprising an abdominal portion covering the wearer's abdomen, a dorsal portion covering the back, and an absorbent body covering the groin area and including an absorbent material, wherein the absorbent body is an absorbent article in which the front and rear ends in the longitudinal direction extend to the central portion in the widthwise direction of the abdominal portion and the dorsal portion, respectively, and further comprises a sweat-absorbing sheet disposed on the skin-contact surface of at least one of the abdominal portion and the dorsal portion, and a moisturizing agent applied to the skin-contact surface of at least one of the abdominal portion and the dorsal portion. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide an absorbent article that can suppress skin problems caused by sweat while also suppressing skin problems caused by moisture loss. [Brief explanation of the drawing]

[0009] [Figure 1] This is a plan view showing an example of the structure of an absorbent article according to the first embodiment in an unfolded state. [Figure 2] This is a cross-sectional view along the longitudinal centerline CL in Figure 1. [Figure 3] This is a cross-sectional view along the widthwise centerline CW in Figure 1. [Figure 4] Figure 1 is a plan view showing an example of application of a moisturizer in an unfolded state. [Figure 5]It is a plan view in a developed state showing another application example of the moisturizing agent in FIG. 1. [Figure 6] It is a plan view in a developed state showing another application example of the moisturizing agent in FIG. 1. [Figure 7] It is a plan view in a developed state showing a configuration example of the absorbent article according to the second embodiment. [Figure 8] It is a cross-sectional view along the center line CW in the width direction in FIG. 7. [Figure 9] It is a plan view in a developed state showing an application example of the moisturizing agent in FIG. 7. [Figure 10] It is a plan view in a developed state showing another application example of the moisturizing agent in FIG. 7. [Embodiments for Carrying Out the Invention]

[0010] This embodiment relates to the following aspects.

[0011] [Aspect 1] An absorbent article having a longitudinal direction, a width direction, and a thickness direction that are orthogonal to each other in a developed state, an abdominal side portion that covers the wearer's abdomen, a dorsal side portion that covers the back, and a crotch portion, and including an absorbent body, wherein the absorbent body has front and rear end portions in the longitudinal direction extending to central portions in the width direction of the abdominal side portion and the dorsal side portion, respectively, and further includes a sweat-absorbing sheet disposed on at least one skin contact surface of the abdominal side portion and the dorsal side portion, and a moisturizing agent applied to at least one skin contact surface of the abdominal side portion and the dorsal side portion.

[0012] In this absorbent product, a sweat-absorbing sheet is placed on at least one of the ventral and dorsal sides, which are areas prone to sweating. This allows sweat to be absorbed from the skin. However, simply placing a sweat-absorbing sheet may lead to excessive absorption of moisture from the skin, potentially promoting skin dryness. Therefore, in this absorbent product, a moisturizer is applied to at least one of the ventral and dorsal sides. This allows the applied moisturizer to be transferred to the skin, protecting it. As a result, the skin's moisture content can be maintained, suppressing skin problems such as sebum loss, cracking, and eczema caused by dry skin. Thus, in this absorbent product, it is possible to suppress skin problems caused by sweat while also suppressing skin problems caused by moisture loss.

[0013] [Aspect 2] The absorbent article according to Embodiment 1, wherein the humectant is disposed on at least one of the surfaces of a first region located on both outer sides in the width direction of the sweat-absorbing sheet and a second region located on both outer sides in the longitudinal direction of the sweat-absorbing sheet, and the amount of the humectant is greater on at least one of the surfaces of the first region and the second region than on the surface of the sweat-absorbing sheet.

[0014] In this absorbent article, the humectant is more abundantly distributed on the surface of the first or second region on both the ventral or dorsal side of the sweat-absorbing sheet, in the widthwise or longitudinal direction, than on the surface of the sweat-absorbing sheet itself. By distributing the humectant more abundantly around the sweat-absorbing sheet in this way, skin dryness caused by the absorption of moisture from the skin by the sweat-absorbing sheet can be more effectively suppressed. Therefore, in this absorbent article, it is possible to further suppress skin problems caused by sweat while also further suppressing skin problems caused by moisture loss.

[0015] [Aspect 3] The absorbent article according to embodiment 1 or 2, wherein the sweat-absorbing sheet is hydrophilic, the moisturizing agent is hydrophilic, and the moisturizing agent is applied to the sweat-absorbing sheet.

[0016] In this absorbent material, applying a hydrophilic humectant to a hydrophilic sweat-absorbing sheet suppresses hydrogen bonding between hydrophilic fibers in the sheet, thereby increasing the flexibility of the sweat-absorbing sheet. This improves the sheet's adhesion to the skin, thereby enhancing its sweat-absorbing performance. At the same time, the hydrophilic humectant applied to the hydrophilic sweat-absorbing sheet penetrates from the surface into the interior of the sheet, and some is transferred to the skin, so only a small amount remains on the surface of the sweat-absorbing sheet. This suppresses the decrease in the sweat-absorbing performance of the sweat-absorbing sheet caused by the humectant, and more effectively prevents skin dryness caused by excessive absorption of moisture from the skin by the sweat-absorbing sheet.

[0017] [Aspect 4] The absorbent article according to embodiment 3, wherein the sweat-absorbing sheet contains absorbent fibers, and the proportion of absorbent fibers in the sweat-absorbing sheet is less in the skin-facing portion than in the non-skin-facing portion.

[0018] In this absorbent product, the inclusion of absorbent fibers in the sweat-absorbing sheet makes it easier to retain moisturizers, allowing the sheet to maintain its flexibility for a long period. As a result, it can maintain its adhesion to the skin for a long period, and therefore, the sweat-absorbing performance of the sweat-absorbing sheet can also be maintained for a long period. At the same time, the proportion of absorbent fibers in the sweat-absorbing sheet is lower on the skin-facing side than on the non-skin-facing side, which suppresses the return of absorbed sweat to the skin-facing side, i.e., to the skin, when the sweat-absorbing sheet is subjected to body pressure after absorbing sweat.

[0019] [Aspect 5] The absorbent article according to embodiment 3 or 4, wherein a hydrophobic sheet is arranged on the non-skin side of the sweat-absorbing sheet.

[0020] In this absorbent material, a hydrophobic sheet is positioned on the non-skin side of the sweat-absorbing sheet. Therefore, even if the moisturizer applied to the sweat-absorbing sheet penetrates from the surface into the interior of the sweat-absorbing sheet, penetration into the non-skin side beyond the hydrophobic sheet can be suppressed. As a result, the moisturizer can remain on the sweat-absorbing sheet material for a longer period, maintaining the flexibility of the sweat-absorbing sheet for a longer period, thus maintaining adhesion to the skin for a longer period, and thus maintaining the sweat-absorbing performance of the sweat-absorbing sheet for a longer period.

[0021] [Aspect 6] The absorbent article according to any one of embodiments 1 to 5, wherein the absorbent body further includes a surface sheet located on the skin side of the absorbent body and having a sweat-absorbing function, and the moisturizer is applied to the surface sheet.

[0022] The surface sheet of the absorbent body is in contact with areas prone to sweating. Therefore, this absorbent product incorporates a moisturizer on the surface sheet. Because the surface sheet is sweat-absorbing, it can absorb sweat from the skin, and by incorporating a moisturizer, concerns about excessive absorption of skin moisture and subsequent skin dryness can be eliminated. As a result, the skin is protected by the moisturizer, maintaining its moisture level and suppressing skin problems such as sebum loss, cracking, and eczema caused by dryness. Thus, this absorbent product makes it possible to suppress skin problems caused by sweat while also suppressing skin problems caused by moisture loss.

[0023] [Aspect 7] The basis weight of the aforementioned humectant is 0.3 g / m². 2 More than 2.5g / m 2 The absorbent article described in any one of the following embodiments 1 to 6.

[0024] In this absorbent material, the basis weight of the humectant is 0.3 g / m². 2 More than 2.5g / m 2 The following applies: The basis weight of the humectant is the lower limit (0.3 g / m²). 2 The amount of humectant must be above the upper limit (2.5 g / m²) to exert the effect of the humectant (including the effect of increasing the flexibility of the sweat-absorbing sheet if the humectant is applied to the sweat-absorbing sheet).2 By keeping the amount below a certain level, the stickiness of the moisturizer during application can be suppressed. Therefore, the optimal amount of moisturizer can achieve both moisturizing effect and stickiness suppression.

[0025] [Aspect 8] The absorbent article according to any one of embodiments 1 to 7, wherein at least one of the ventral portion and the dorsal portion includes an elastic member that expands and contracts in the width direction, and the elastic member and the sweat-absorbing sheet overlap in the thickness direction.

[0026] This absorbent article includes an elastic member in at least one of its ventral and dorsal portions that expands and contracts in the width direction. As a result, the portion of the ventral or dorsal portion where the elastic member is located may become tighter against the skin due to the contraction of the elastic member, raising concerns about adverse effects on the skin. Therefore, by overlapping the portion of the elastic member (where it is located) and the sweat-absorbing sheet in the thickness direction, the tightness against the skin can be alleviated, reducing the burden on the skin and suppressing skin problems. In particular, when a hydrophilic moisturizer is applied to a hydrophilic sweat-absorbing sheet, the sweat-absorbing sheet becomes more flexible as described above because the moisturizer is applied to the sweat-absorbing sheet. When this flexible sweat-absorbing sheet and the elastic member overlap in the thickness direction, the contraction force of the elastic member makes the sweat-absorbing sheet more flexible and allows it to adhere more closely to the wearer's skin. This allows for better absorption of the wearer's sweat, prevents excessive absorption of moisture from the skin, and suppresses skin problems.

[0027] [Aspect 9] The sweat-absorbing sheet is an absorbent article according to any one of embodiments 1 to 8, which is arranged on the back side.

[0028] Users generally sweat more on their backs. Therefore, this absorbent product places a sweat-absorbing sheet on the back side that covers the back, thereby maximizing the sweat-absorbing effect of the sheet. As a result, excess sweat is expelled while necessary moisture is retained on the skin, thus suppressing skin problems caused by both sweat and dryness.

[0029] [Aspect 10] The absorbent article according to any one of embodiments 1 to 9, wherein the coefficient of friction MIU value of the area where the humectant is placed is 0.5 or more and 1.10 or less.

[0030] In this absorbent material, the friction coefficient MIU value of the area where the humectant is placed is between 0.5 and 1.10. A low MIU value (below 1.10) prevents excessive friction, thus suppressing skin irritation. Furthermore, a low MIU value (above 0.5) ensures that only the minimum necessary amount of humectant is present, preventing direct contact between the surface of the humectant-containing material and the skin. This, in turn, reduces skin damage caused by friction. Therefore, skin problems can be minimized.

[0031] [Aspect 11] The humectant is an absorbent article according to any one of embodiments 1 to 10, comprising 45% by mass or more of a hygroscopic humectant under conditions of a temperature of 20°C and a relative humidity of 60%RH.

[0032] This absorbent article contains 45% by mass or more of a hygroscopic humectant as a moisturizer under conditions of 20°C and 60% RH relative humidity, which allows it to attract moisture to the skin. This enables it to retain moisture on the skin's surface. In addition, by covering the skin's surface with the hygroscopic humectant, it prevents moisture evaporation from the skin, thus maintaining skin hydration and making it less prone to abrasions even when friction occurs. Furthermore, the hygroscopic humectant penetrates the skin, stabilizing the lipid structure between skin cells and thereby suppressing moisture evaporation from the skin.

[0033] [Aspect 12] The absorbent article according to embodiment 11, wherein the hygroscopic humectant contains glycerin.

[0034] This absorbent material contains glycerin as a hygroscopic humectant, which allows it to more reliably achieve its hygroscopic humectant effect. Specifically, it attracts moisture to the skin, retains moisture on the skin's surface, prevents moisture evaporation from the skin, maintains skin hydration, reduces the likelihood of abrasions, and, by penetrating the skin, stabilizes the lipid structure between skin cells, thereby suppressing moisture evaporation from the skin.

[0035] [Aspect 13] The absorbent article according to embodiment 11 or 12, wherein the humectant further comprises a preservative aid.

[0036] Because this absorbent material contains a large amount of hygroscopic humectant, it can absorb moisture, which poses a risk of microbial (bacterial) growth. Therefore, this absorbent material contains a preservative adjuvant in addition to the humectant. By including a preservative adjuvant in the humectant, a certain degree of preservative (antibacterial) effect can be imparted to the humectant. Furthermore, when a preservative is added to the humectant, the amount of preservative can be reduced. As a result, consumers can use the absorbent material more safely, and the absorbent material can be stored for a longer period.

[0037] Hereinafter, an absorbent article according to an embodiment of the present invention will be described with reference to the drawings, using a disposable diaper for children as an example. However, the present invention is not limited to its embodiments and examples, and can be applied to other types of absorbent articles, such as disposable diapers for children with different details, disposable diapers for adults, and sanitary napkins in the form of panties, without departing from the subject matter of the present invention.

[0038] (First Embodiment) First, the first embodiment will be described. The disposable diaper 1 of this embodiment is of the pant type. Figures 1 to 3 show the disposable diaper 1 according to this embodiment. Figure 1 is a plan view showing the unfolded state of an example of the configuration of the disposable diaper 1, and therefore shows the state in which the elastic member is extended and the side seal portion (described later) is not joined. Figure 2 is a cross-sectional view along the longitudinal center line CL (described later) in Figure 1. Figure 3 is a cross-sectional view along the widthwise center line CW (described later) in Figure 1.

[0039] Disposable diaper 1, in the unfolded state shown in Figures 1 to 3, has a longitudinal direction L, a width direction W, and a thickness direction T that are mutually orthogonal. The imaginary line passing through the center of the width direction W of disposable diaper 1 and extending along the longitudinal direction L is called the longitudinal centerline CL, and the width centerline passing through the center of the longitudinal direction L and extending along the width direction W is called the width centerline CW. Here, the direction and side approaching the longitudinal centerline CL are considered the inward and inward directions of the width direction W, respectively, and the direction and side moving away from the width centerline CL are considered the outward and outward directions of the width direction W, respectively. On the other hand, the direction and side approaching the width centerline CW are considered the inward and inward directions of the longitudinal direction L, respectively, and the direction and side moving away from the width centerline CW are considered the outward and outward directions of the longitudinal direction L, respectively. Furthermore, viewing disposable diaper 1 placed on a plane parallel to the plane containing the longitudinal direction L and the width direction W from above the plane in the thickness direction T is called a "planar view," and the shape perceived in a planar view is called the "planar shape." Any direction within a plane including the longitudinal direction L and the width direction W is called the "plane direction". When disposable diaper 1 is worn, the side of the disposable diaper 1 that is relatively closer to the wearer's skin and the side that is farther away from the wearer's skin in the thickness direction T are also called the "skin side" and the "non-skin side", respectively. In disposable diaper 1, the surface that comes into contact with the skin and the surface opposite it are also called the "skin-contact surface" and the "non-skin-contact surface", respectively. In the longitudinal direction L, the side that is relatively closer to the ventral side (described later) or farther away from the dorsal side (described later) is also called the ventral side or anterior side, and the side that is relatively closer to the dorsal side or farther away from the ventral side is also called the dorsal side or posterior side. The above definitions are also applied to each material of disposable diaper 1 and to disposable diaper 1 when it is worn.

[0040] In the case of disposable diapers 1, the statement that their components, structure, and shape are aligned with a predetermined direction (for example, the longitudinal direction L, the width direction W, and the thickness direction T) includes not only cases where the components are parallel to the predetermined direction, but also cases where they are within a range of ±30° with respect to the predetermined direction. For curved or curved components, the components are evaluated as described above with respect to the tangents at each point on the curve.

[0041] The disposable diaper 1 comprises an abdominal portion 3, a dorsal portion 2, and an absorbent body 4. The abdominal portion 3 is the part of the disposable diaper 1 that covers the wearer's abdomen. The absorbent body 4 is the part of the disposable diaper 1 that covers the wearer's groin area and includes an absorbent material 8. The dorsal portion 2 is the part of the disposable diaper 1 that covers the wearer's back. At least the front and rear ends of the absorbent body 4 in the longitudinal direction L extend to the central portion in the width direction W of the abdominal portion 3 and dorsal portion 2, respectively.

[0042] In this embodiment, the front and rear ends of the absorbent body 4 are connected, for example, to the central portion in the width direction W of the ventral portion 3 and the dorsal portion 2, respectively, by an adhesive (example: hot melt adhesive, the same applies hereinafter). In this case, the front and rear ends of the absorbent body 4 reach approximately the central portion in the longitudinal direction L of the ventral portion 3 and the dorsal portion 2, respectively, but may also reach approximately the outer ends in the longitudinal direction L.

[0043] Disposable diaper 1 is formed by joining together a pair of ventral joints 3a located at both ends of the width direction W of the ventral portion 3 and extending along the longitudinal direction L, and a pair of dorsal joints 2a located at both ends of the width direction W of the dorsal portion 2 and extending along the longitudinal direction L. The pair of ventral joints 3a and the pair of dorsal joints 2a joined together are also called a pair of side seals. In this case, in disposable diaper 1, the ventral portion 3 and dorsal portion 2 joined together by the pair of side seals form a waist area that covers the wearer's waist. In addition, the outer ends of the ventral portion 3 and dorsal portion 2 in the longitudinal direction L define a waist opening through which the wearer's waist passes. Furthermore, in disposable diaper 1, the ends on both sides of the width direction W of the absorbent body 4 and the inner ends of the ventral portion 3 and dorsal portion 2 in the longitudinal direction L define a pair of leg openings through which the wearer's legs pass.

[0044] In this embodiment, when unfolded, the ventral portion 3 and the dorsal portion 2 each have a rectangular shape that is generally long in the width direction W, and are spaced apart from each other in the longitudinal direction L. The absorbent body 4 has a rectangular shape that is generally long in the longitudinal direction L, and one end in the longitudinal direction L is connected to the ventral portion 3, and the other end is connected to the dorsal portion 2. The ventral portion 3, the absorbent body 4, and the dorsal portion 2 are formed separately from each other. Therefore, the disposable diaper 1 is a 3-piece type. At least two of the ventral portion 3, the absorbent body 4, and the dorsal portion 2 may be formed as a single unit, or they may be connected as a single unit by another outer sheet or the like. For example, if the ventral portion 3 and the dorsal portion 2 share at least one of the sheet members that make up the ventral portion 3 and the dorsal portion 2, and are formed as a single unit by a continuous sheet member, then the disposable diaper 1 can be said to be a 2-piece type composed of that and the absorbent body 4. A two-piece disposable diaper is a disposable diaper that, when unfolded, has an abdominal section, a crotch section, and a dorsal section, with the abdominal, crotch, and dorsal sections joined together by a single outer covering.

[0045] Each of the ventral portion 3 and the dorsal portion 2 is formed from a liquid-impermeable sheet material. In this embodiment, each of the ventral portion 3 and the dorsal portion 2 has at least the skin-facing surface (inner sheet material 31, 21: described later) made from a sheet material containing hydrophobic fibers. Therefore, at least the surface portion of the skin-facing side of the sheet material contains hydrophobic fibers. As a result, hydrophilic agents have difficulty penetrating the surface portion of the skin-facing side. However, each of the ventral portion 3 and the dorsal portion 2 may also have the non-skin-facing side (outer sheet material 32, 22: described later) made from a sheet material containing hydrophobic fibers. The surface portion refers to the area from the surface of the sheet material up to 1 / 4 of its thickness.

[0046] When a sheet material contains hydrophobic fibers, it is preferable that the fibers constituting the sheet material contain 70% by mass or more of hydrophobic fibers, more preferably 80% by mass or more, even more preferably 90% by mass or more, and may even be 100% by mass. Examples of hydrophobic fibers include thermoplastic resin fibers, such as polyolefin resin fibers like polypropylene and polyethylene, polyamide resin fibers like 6-nylon and 6,6-nylon, and polyester resin fibers like polyethylene terephthalate and polybutylene terephthalate. It is preferable that these thermoplastic fibers do not contain hydrophilic agents. A sheet material containing 70% by mass or more of hydrophobic fibers can be called a hydrophobic sheet material (hydrophobic sheet).

[0047] The ventral portion 3 is formed by laminating an inner sheet member 31 located on the skin side and an outer sheet member 32 located on the non-skin side in the thickness direction T, and joining them with an adhesive or heat seal (the same applies hereinafter). Similarly, the dorsal portion 2 is formed by laminating an inner sheet member 21 located on the skin side and an outer sheet member 22 located on the non-skin side in the thickness direction T, and joining them with an adhesive or the like.

[0048] In this embodiment, the outer sheet member 32 on the non-skin side has its outer end in the longitudinal direction L folded back towards the skin side and overlapping the inner sheet member 31 on the skin side. In this case, the outer sheet member 32 that has been folded back and is located on the skin side is considered to be the inner sheet member 31. Similarly, the outer sheet member 22 on the non-skin side has its outer end in the longitudinal direction L folded back towards the skin side and overlapping the inner sheet member 21 on the skin side. In this case, the outer sheet member 22 that has been folded back and is located on the skin side is considered to be the inner sheet member 21.

[0049] In this embodiment, the ventral portion 3 and the dorsal portion 2 are joined at multiple locations by an inner sheet member 31, 21 and an outer sheet member 32, 22, respectively, using a hydrophobic adhesive. Therefore, in each of the ventral portion 3 and the dorsal portion 2, adhesive is scattered at multiple locations on the inner sheet member 31, 21 and the outer sheet member 32, 22, respectively.

[0050] In the ventral portion 3, multiple waist elastic members 13 for waist gathering are arranged between the inner sheet member 31 located on the skin side and the outer sheet member 32 located on the non-skin side. The multiple waist elastic members 13 extend along the width direction W from one end of the ventral portion 3 in the width direction W to the other, except for the area that overlaps with the central part of the absorber 8 in the thickness direction T, and are arranged with gaps in the longitudinal direction L. The inner sheet member 31 and the outer sheet member 32 and the multiple waist elastic members 13 are joined together with an adhesive or the like. In this embodiment, a hydrophobic adhesive is used.

[0051] In the back portion 2, multiple waist elastic members 12 for waist gathering are arranged between the inner sheet member 21 located on the skin side and the outer sheet member 22 located on the non-skin side. The multiple waist elastic members 12 extend along the width direction W from one end of the back portion 2 in the width direction W to the other, except for the area that overlaps with the central part of the absorber 8 in the thickness direction T, and are arranged with gaps in the longitudinal direction L. The inner sheet member 21 and the outer sheet member 22 and the multiple waist elastic members 12 are joined together with an adhesive or the like. In this embodiment, a hydrophobic adhesive is used.

[0052] In this embodiment, the ventral portion 3 may include a ventral cover sheet member 43 positioned on the skin-facing surface so as to cover the ventral end of the absorbent body 4 in the longitudinal direction L from the skin side. The ventral cover sheet member 43 prevents the ventral end of the absorbent body 4 from directly touching the wearer's skin, thereby suppressing skin friction. Similarly, the dorsal portion 2 may include a dorsal cover sheet member 42 positioned on the skin-facing surface so as to cover the dorsal end of the absorbent body 4 in the longitudinal direction L from the skin side. The dorsal cover sheet member 42 prevents the dorsal end of the absorbent body 4 from directly touching the wearer's skin, thereby suppressing skin friction. The ventral cover sheet member 43 and the dorsal cover sheet member 42 are made of the same material as the inner sheet members 31 and 21, for example.

[0053] Multiple waist elastic members 12 and 13 expand and contract the waist area. There are no particular restrictions on the type of elastic member, but examples include thread-like rubber, stretchable nonwoven fabric, or stretchable film. There are no particular restrictions on the material of each elastic member, but examples include styrene-butadiene rubber and urethane rubber. The characteristics of each elastic member, such as the size of the cross-section (wire diameter, etc.) and the elongation ratio, are appropriately selected according to the magnitude of the tightening force corresponding to the position within the waist WP.

[0054] Examples of the sheet materials mentioned above include any liquid-impermeable sheet, such as liquid-impermeable nonwoven fabrics, synthetic resin films, composite sheets thereof, SB nonwoven fabrics, SMS nonwoven fabrics, etc. There are no particular restrictions on the type of nonwoven fabric, such as meltblown nonwoven fabrics, spunbond nonwoven fabrics, airlaid nonwoven fabrics, and air-through nonwoven fabrics. There are no particular restrictions on the material of the nonwoven fabric or synthetic resin film of the sheet material, as long as it can be used for sanitary products, but examples include polyolefin resins such as polypropylene and polyethylene, polyamide resins such as 6-nylon and 6,6-nylon, and polyester resins such as polyethylene terephthalate and polybutylene terephthalate. The basis weight of the nonwoven fabric of the sheet material is, for example, 5 to 100 g / m². 2 The amount is preferably 10-50 g / m².2 It is as follows. The length (thickness) in the thickness direction T of the sheet member is, for example, 0.1 to 5 mm, preferably 0.1 to 2 mm. Each of the sheet members constituting the ventral part 3 and the dorsal part 2 may be two sheets of the inner sheet member and the outer sheet member described above, or may be one sheet, or three or more sheets (not shown). Note that the sheet member does not have to be folded back (not shown). When each sheet member is a hydrophobic sheet, for example, in the case of a sheet member containing hydrophobic fibers as the main constituent fibers, a hydrophobic material may be selected from the above materials as the material of the fibers constituting the sheet member.

[0055] The disposable diaper 1 further includes a sweat-absorbing sheet member (sweat-absorbing sheet) 46 disposed on at least one skin contact surface of the ventral part 3 and the dorsal part 2. The sweat-absorbing sheet member 46 is a sheet that absorbs sweat from the wearer. In the present embodiment, it is disposed on the skin-side surface so as to cover at least one end portion on the ventral side and the dorsal side in the longitudinal direction L of the absorbent body 4 from the skin side.

[0056] The configuration of the sweat-absorbing sheet member 46 is not particularly limited as long as it can absorb sweat from the wearer. In the present embodiment, for example, a sheet having the following configuration is used. That is, the sweat-absorbing sheet member 46 has a substantially rectangular shape that is long in the width direction W, and includes a first layer located on the skin side, a second layer located on the non-skin side, and an intermediate layer located between the first layer and the second layer. The first layer is composed of first fibers that are hydrophilic fibers. The second layer is laminated on the first layer in the thickness direction and is composed of second fibers that are hydrophilic fibers. The hydrophilicity of the first fibers is lower than the hydrophilicity of the second fibers. The water retention of the intermediate layer is higher than the water retention of the first layer, and the water retention of the second layer is higher than the water retention of the intermediate layer. Therefore, the sweat-absorbing sheet member 46 can be said to be a hydrophilic sheet. In the present embodiment, a part of the hydrophilic fibers contained in the first layer and the second layer is intertwined with each other and is also intertwined with the fibers contained in the intermediate layer. Note that the evaluation direction of hydrophilicity will be described later.

[0057] The basis weight of the first layer in the sweat-absorbing sheet member 46 is, for example, 5 to 20 g / m 2Examples include: The thickness of the first layer can be, for example, 0.05 to 0.4 mm. The basis weight of the second layer can be, for example, 5 to 20 g / m². 2 Examples include: The thickness of the second layer can be 0.05 to 0.4 mm. The basis weight of the intermediate layer can be, for example, 10 to 30 g / m². 2 Examples include the thickness of the intermediate layer, for example, 0.03 to 0.09 mm. The external shape, various dimensions, and basis weight of the sweat-absorbing sheet member 46 can be any external shape, dimensions, and basis weight that are appropriate for each component of the disposable diaper 1 to which the sweat-absorbing sheet member 46 is applied.

[0058] The types of hydrophilic fibers included in the first and second layers of the sweat-absorbing sheet member 46 are not particularly limited. In this embodiment, examples of hydrophilic fibers (relatively low hydrophilicity) included in the first layer include polyethylene terephthalate (PET) fibers whose fiber surface has been treated to be hydrophilic. Examples of hydrophilic fibers (relatively high hydrophilicity) included in the second layer include regenerated cellulose fibers such as rayon and fibril rayon, and natural cellulose fibers such as cotton and crushed pulp. Rayon fibers are preferred because they have excellent liquid diffusion properties, strength after entanglement, and versatility. As for the fibers included in the intermediate layer, it is preferable to use a pulp sheet containing at least pulp fibers. Examples of pulp fibers include wood pulp and non-wood pulp. Examples of wood pulp include coniferous pulp and hardwood pulp, and examples of non-wood pulp include cotton pulp, hemp pulp, straw pulp, bamboo pulp, bagasse pulp, reed pulp, and kenaf pulp. The fibers contained in these intermediate and second layers are absorbent fibers capable of absorbing moisture. The intermediate layer may also contain an antibacterial agent.

[0059] <Method for evaluating hydrophilicity> A sample is prepared by arranging the fibers from the first layer and the fibers from each of the second layers on an acrylic plate to form a 100mm x 100mm square sheet with the same thickness and basis weight. 0.05 mL of colored water is dropped onto the sample from 30 mm above. After 10 minutes, the diffusion area of ​​the colored water is measured using an image analysis device. A larger measured value indicates higher hydrophilicity of the liquid.

[0060] In this embodiment, the disposable diaper 1 further comprises an outer sheet member 14 that bridges the gap between the ventral portion 3 and the dorsal portion 2. The outer sheet member 14 is a liquid-impermeable sheet member, such as a nonwoven fabric, and its ends in the longitudinal direction L are laminated to the ventral portion 3 and the dorsal portion 2, respectively, and joined with an adhesive or the like. The type and material of the nonwoven fabric are as described above. The outer sheet member 14 is also joined with an adhesive or the like to the non-skin side of the absorbent body 4, which is generally positioned between the ventral portion 3 and the dorsal portion 2, thereby assisting and protecting the absorbent body 4 from the non-skin side. The outer sheet member 14 may be composed of two or more sheet members (not shown). Another sheet member separate from the outer sheet member 14 may be provided on the non-skin side (not shown).

[0061] The disposable diaper 1 may further include a sheet-like stretchable member (not shown) that is attached with adhesive to the non-skin side (or skin side) of at least one of the ventral portion 3 and the dorsal portion 2, and that extends along the width direction W and stretches in the width direction W. The sheet-like stretchable member is, for example, a sheet-like member that is stretchable in the width direction W, and functions as a waist gather and / or sweat-absorbing sheet. Examples of the types of sheet-like stretchable members include stretchable nonwoven fabrics that are composites of styrene rubber, olefin rubber, urethane rubber, etc., with nonwoven fabric or paper, etc.

[0062] The absorbent body 4 is located in the center of the width direction W and has a central body portion 10 that extends along the longitudinal direction L, and may further have a pair of leg gather portions 5 located at both ends of the width direction W and extending along the longitudinal direction L. Each of the pair of leg gather portions 5 extends along the longitudinal direction L and has a plurality of leg elastic members 5a that are spaced apart in the width direction W.

[0063] The central part 10 of the main body has a roughly rectangular shape and includes a liquid-permeable surface sheet 7, a liquid-impermeable back sheet 9, and an absorbent 8 located between the surface sheet 7 and the back sheet 9 that absorbs and retains liquid. The absorbent 8 is joined to the surface sheet 7 and the back sheet 9 by adhesive, and the surface sheet 7 and the back sheet 9 are joined to each other by adhesive at their peripheral edges. The shape of the central part 10 of the main body is not limited to the above example, as long as it is long in the longitudinal direction L, for example, a rectangle with rounded corners, a rectangle with a short side that curves outward, or an hourglass shape.

[0064] Examples of the surface sheet 7 include liquid-permeable nonwoven or woven fabrics, synthetic resin films with liquid-permeable pores, and composite sheets thereof. There are no particular restrictions on the surface sheet 7 as long as it can be used as an absorbent article. If it is desired to have a sweat-absorbing function, the surface sheet 7 may include a sheet containing water-absorbing fibers, for example, a sheet having the same structure as the sweat-absorbing sheet member 46 described later but without the intermediate layer, or a sheet having the same structure as thermoplastic fibers (e.g., polyester resin (e.g., PET)) / cellulose fibers (e.g., cotton) / thermoplastic fibers (e.g., polyester resin (e.g., PET)). Examples of the back sheet 9 include liquid-impermeable nonwoven fabrics or synthetic resin films, composite sheets thereof, and SMS nonwoven fabrics. There are no particular restrictions on the type of nonwoven fabric, for example, meltblown nonwoven fabrics, spunbond nonwoven fabrics, airlaid nonwoven fabrics, and air-through nonwoven fabrics. There are no particular restrictions on the type of synthetic resin film, and known film materials can be used. There are no particular restrictions on the materials used for nonwoven fabrics and synthetic resin films, as long as they can be used for sanitary products. Examples include olefin resins such as polyethylene and polypropylene, polyamide resins such as 6-nylon and 6,6-nylon, and polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT). Cellulose fibers may also be used as the material for nonwoven fabrics. To provide breathability, the synthetic resin film may contain inorganic particles such as calcium carbonate.

[0065] The absorbent body 8 includes an absorbent core 8b that absorbs and retains liquid, and a core wrap 8a that encloses the absorbent core 8b, and may also include grooves 8c that allow the liquid to diffuse in the longitudinal direction L and the width direction W. As the material of the absorbent core 8b, absorbent materials include at least one of cellulose fibers and superabsorbent polymers. Examples of cellulose fibers include natural cellulose fibers such as wood pulp fibers, cross-linked pulp fibers, and non-wood pulp fibers, as well as regenerated cellulose fibers and semi-synthetic cellulose fibers. In the case of pulp fibers, the average major diameter of the fibers is, for example, several tens of μm, preferably 20 to 40 μm, and the average fiber length is, for example, several millimeters, preferably 2 to 5 mm. Examples of superabsorbent polymers (SAP) include polyacrylate-based, polysulfonate-based, and maleate anhydride-based superabsorbent polymers. As the size (when dry) of the superabsorbent polymer, the average particle size is, for example, several hundred μm, preferably 200 to 500 μm. For example, the basis weight of the cellulose fibers and superabsorbent polymers is 100 to 400 g / m², respectively. 2 Examples include liquid-permeable sheets such as nonwoven fabric or tissue paper, which can be used as materials for Corewrap 8a.

[0066] The central part 10 of the main body is provided with a pair of leak-proof walls 6 arranged facing each other on both sides in the width direction W and extending along the longitudinal direction L. Each leak-proof wall 6 is formed of a leak-proof sheet member 6b that extends along the longitudinal direction L and contains a plurality of leak-proof elastic members 6a arranged at intervals in the width direction W. The outer end of each leak-proof wall 6 in the width direction W is joined to at least one of the surface sheet 7, absorbent 8, and back sheet 9 with an adhesive or the like to form a fixed end, and the inner end in the width direction W is spaced apart from the other sheets, including the surface sheet 7, to form a free end. The plurality of leak-proof elastic members 6a are joined with an adhesive near the free end of the leak-proof sheet member 6b. Examples of leak-proof sheet members 6b include hydrophobic sheet members, and examples of hydrophobic sheet members include nonwoven fabrics containing hydrophobic fibers. The type and material of the nonwoven fabric are the same as, for example, as in the case of the inner sheet members 31 and 21 described above. Multiple leak-proof elastic members 6a are exemplified by rubber threads, but the type and material of the elastic members are as described above. The characteristics of the elastic members, such as the size of the cross-section (wire diameter, etc.) and the elongation ratio, are appropriately selected according to the function of the leak-proof wall 6. Note that each leak-proof wall 6 may have its inner end in the width direction W folded back to the outside in the width direction W.

[0067] A pair of leg gather sections 5 are joined to both ends of the main body central section 10 in the width direction W. Each leg gather section 5 extends along the longitudinal direction L and comprises a plurality of leg elastic members 5a arranged at intervals in the width direction W, and a skin-side and a non-skin-side leg sheet member 5b that sandwiches the plurality of leg elastic members 5a. The inner end of each leg gather section 5 in the width direction W is joined to the non-skin-side surface of the end of the main body central section 10 in the width direction W with adhesive to form a fixed end, and the outer end in the width direction W is spaced apart from the main body central section 10 to form a free end. The plurality of leg elastic members 5a are joined with adhesive near the free ends of the skin-side and non-skin-side leg sheet members 5b. The plurality of leg elastic members 5a cause each leg gather section 5 to expand and contract. Examples of leg sheet members 5b include hydrophobic sheet members, and examples of hydrophobic sheet members include nonwoven fabrics containing hydrophobic fibers. The type and material of the nonwoven fabric are as described above. The multiple leg elastic members 5a are exemplified by elastic threads, and the type and material of these elastic members are as described above. The characteristics of the elastic members, such as the size of the cross-section (linearity, etc.) and the elongation ratio of the elastic members, are appropriately selected according to the magnitude of the tightening force corresponding to the position within the leg gather portion 5.

[0068] In the disposable diaper 1, a pair of leg gathers 5 are bridged by an outer sheet member 14. The outer sheet member 14 is laminated at both ends in the width direction W to the inner ends in the width direction W of each of the pair of leg gathers 5 and joined with an adhesive or the like, thus supporting and protecting the pair of leg gathers 5 from the non-skin side. The pair of leg gathers 5 may be formed integrally with the outer sheet member 14.

[0069] The dorsal portion 2 may include a dorsal extension that extends further inward from the inner edge in the longitudinal direction L of the dorsal main body portion, which occupies substantially the same area as the dorsal joint portion 2a in the longitudinal direction L. The dorsal extension is the inner region of the dorsal portion 2 in the longitudinal direction L. The portion of the dorsal extension that does not overlap with the absorbent main body 4, i.e., the portions on both sides in the width direction W, functions as a pair of buttock cover portions 40. The buttock cover portions 40 protect the wearer's buttocks from the outside. The buttock cover portions 40 include a buttock elastic member 41 that deforms the buttock cover portions 40 to conform to the wearer's buttocks.

[0070] Next, the application of the moisturizer in this embodiment will be described. The disposable diaper 1 (absorbent article) is equipped with a moisturizer and a sweat-absorbing sheet member (sweat-absorbing sheet) 46 on at least one of the skin-contacting surface (skin-facing surface) of the ventral portion 3 and the skin-contacting surface (skin-facing surface) of the dorsal portion 2.

[0071] Figure 4 is a plan view of the unfolded state showing an example of the application of the moisturizer SC to the disposable diaper 1 according to the first embodiment of Figure 1. However, the areas indicated by multiple dots are areas to which the moisturizer SC has been applied (the same applies hereafter in Figures 5 to 7, 10 and 11). In this embodiment, the sweat-absorbing sheet member 46 is placed on the skin-facing surface of the dorsal portion 2. The moisturizer SC is applied (placed) to the skin-contact surfaces 3S and 2S (skin-facing surfaces) of both the ventral portion 3 and the dorsal portion 2, and to the skin-contact surface 46S of the sweat-absorbing sheet member 46 on the dorsal portion 2. Therefore, on the dorsal portion 2, the moisturizer SC is placed on the sweat-absorbing sheet member 46 and in the area surrounding the sweat-absorbing sheet member 46. The areas on the ventral portion 3, the dorsal portion 2, and the sweat-absorbing sheet member 46 to which the moisturizer SC is applied / placed can be called the areas 3EA, 2EA, and 46EA where the moisturizer SC exists. In Figure 4, the moisturizer SC may be applied to only one of the ventral portion 3 and the dorsal portion 2.

[0072] If the moisturizing agent SC is applied to the ventral portion 3, it is applied to at least the inner sheet member 31 of the ventral portion 3. If a ventral cover sheet member 43 is provided, it is further applied to the skin-contact surface of the ventral cover sheet member 43, and if a sweat-absorbing sheet member 46 is provided, it is further applied to the skin-contact surface 46S of the sweat-absorbing sheet member 46. Similarly, if the moisturizing agent SC is applied to the dorsal portion 2, it is applied to at least the inner sheet member 21 of the dorsal portion 2. If a dorsal cover sheet member 42 is provided, it is further applied to the skin-contact surface of the dorsal cover sheet member 42, and if a sweat-absorbing sheet member 46 is provided, it is further applied to the skin-contact surface 46S of the sweat-absorbing sheet member 46.

[0073] However, the areas where the moisturizing agent SC is present in each sheet member (e.g., areas 3EA, 2EA, 46EA) do not need to cover the entire surface of the skin-contacting surface of each sheet member (e.g., skin-contacting surfaces 3S, 2S, 46S). The areas where the moisturizing agent SC is present are, for example, at least 20% of the skin-contacting surface of the sheet member in terms of area ratio, preferably 40% or more, more preferably 60% or more, and even more preferably 80% or more. Furthermore, the sheet member in which the moisturizing agent SC is present does not need to be just one; it may be present in multiple sheet members. Examples of sheet members include at least one of the inner sheet members 31, 21, the ventral cover sheet member 43, the dorsal cover sheet member 42, and the sweat-absorbing sheet member 46. The moisturizing agent SC may be present continuously or intermittently in a single sheet member. Intermittent means, for example, in a striped, checkerboard, or grid pattern. The moisturizing agent SC may be present in multiple locations independently of each other in a single sheet member.

[0074] In this disposable diaper 1, a sweat-absorbing sheet 46 is placed on at least one of the ventral portion 3 and the dorsal portion 2, which are areas prone to sweating. This allows sweat to be absorbed from the skin. However, simply placing the sweat-absorbing sheet 46 may lead to excessive absorption of moisture from the skin, potentially promoting skin dryness. Therefore, in this disposable diaper 1, a moisturizing agent SC is applied to at least one of the ventral portion 3 and the dorsal portion 2. As a result, the applied moisturizing agent SC is transferred to the skin, protecting it. This helps maintain the skin's moisture level and suppresses skin problems such as sebum loss, cracking, and eczema caused by dry skin. Thus, in this disposable diaper 1, it is possible to suppress skin problems caused by sweat while also suppressing skin problems caused by moisture loss.

[0075] The humectant SC is not particularly limited as long as it has a moisturizing effect, and is preferably colorless and transparent. In this embodiment, a hydrophilic humectant is described as an example, but a hydrophobic (oily) humectant may also be used. The hydrophilic humectant SC preferably contains moisturizing components and water. The main component of the hydrophilic moisturizing component is preferably glycerin, hyaluronic acid, urea, heparinoid, etc., which are components that can absorb moisture from the air and moisturize the skin, and glycerin, which is a hygroscopic humectant, is particularly preferred. Examples of oily humectants include ceramide and petrolatum, which suppress moisture evaporation from the skin. As an auxiliary to the moisturizing component, for example, a polyhydric alcohol having moisturizing and antibacterial (preservative) properties may be further included. Examples of polyhydric alcohols include butylene glycol, propylene glycol, dipropylene glycol, and propanediol. Furthermore, as an additive to the moisturizing component, for example, an agent having pharmacological effects such as anti-inflammatory or detoxification effects may be further included. Auxiliary agents having antibacterial (preservative) properties can also be called preservative (antibacterial) auxiliary agents. In this embodiment, the humectant SC includes, for example, glycerin, water, and an auxiliary agent.

[0076] The above-mentioned moisturizer SC preferably contains 45% by mass or more of a hygroscopic moisturizer under conditions of a temperature of 20°C and a relative humidity of 60% RH. By containing 45% by mass or more of a hygroscopic moisturizer, it is possible to attract moisture to the area around the skin, thereby retaining moisture on the skin's surface. In addition, by covering the skin's surface with a hygroscopic moisturizer, it is possible to prevent moisture evaporation from the skin, thus maintaining skin moisture and making it less likely to cause abrasions even if friction occurs. Furthermore, as the hygroscopic moisturizer penetrates the skin, it stabilizes the structure of lipids between skin cells, thereby suppressing moisture evaporation from the skin.

[0077] The hygroscopic humectant contained in the above-mentioned moisturizer SC preferably contains glycerin. This allows the hygroscopic humectant to exert its effects more reliably. Specifically, it can attract moisture to the area around the skin, retain moisture on the skin's surface, prevent moisture evaporation from the skin, maintain skin hydration, reduce the likelihood of abrasions, and, by penetrating the skin, stabilize the lipid structure between skin cells, thereby suppressing moisture evaporation from the skin.

[0078] The above-mentioned humectant SC contains a large amount of hygroscopic humectant, which can cause it to absorb moisture, thus posing a risk of microbial (bacterial) growth. Therefore, it is preferable that the above-mentioned humectant SC further contains a preservative aid. This allows the humectant SC to be given a certain level of preservative (antibacterial) effect. Furthermore, when adding a preservative to the humectant SC, the amount of preservative can be reduced. This allows consumers to use disposable diapers 1 more safely and allows them to be stored for a longer period.

[0079] In hydrophilic humectants, there are no particular restrictions on the proportion of each component as long as a moisturizing effect is achieved. For example, under conditions of 20°C and 60% RH humidity, the main component of the moisturizing agent may be 40-80% by mass, and other components, including auxiliary agents, water, and additives, may be 60-20% by mass.

[0080] The methods for measuring the hydrophilicity / hydrophobicity of humectants and the component ratios are as follows. <Methods for measuring the hydrophilicity and hydrophobicity of humectants and methods for measuring component ratios> (1) Cut out a portion of the nonwoven fabric coated with moisturizer from the disposable diaper to a predetermined size (for example, 5cm x 5cm). (2) Immerse the cut nonwoven fabric in a beaker containing a predetermined amount of water (for example, 500 ml) to dissolve the humectant in the water. (3) The water used for extraction is evaporated under heated and reduced pressure (evaporator) to concentrate the humectant components. If no extracted components are present after the water evaporates (nothing precipitates), the humectant is hydrophobic. (4) If the humectant is hydrophilic, (if the components have been extracted) leave the water in which the humectant has dissolved in a beaker to stand for 4 weeks at a temperature of 20°C and a relative humidity of 60%RH. (5) After the time has elapsed, the water in which the humectant has dissolved is analyzed using a liquid chromatography-mass spectrometer (LC-MS) to measure the mass of each component. (6) From the obtained components and their masses, calculate the ratio of each component (excluding water). If you also want to measure the moisture content, perform the following measurements separately from (1) to (6) above. (7) Separately, perform (1) and (2) above, and leave the water in which the humectant has dissolved in a beaker for a while at a temperature of 20°C and a relative humidity of 60%RH. The water will evaporate, and a mixture (humectant containing water) containing the amount of water that can be contained at a temperature of 20°C and a relative humidity of 60%RH will be formed. Measure the mass of this mixture, including the beaker. (8) Then, place the beaker containing the mixture into a drying oven to remove the moisture from the mixture, and measure the mass of the beaker again. This will give you the mass of the water. (9) Calculate the ratio of each component (including water) from the mass of each component obtained in (5) above and the mass of water obtained in (8) above. (10) If it is confirmed in (3) above that the humectant is hydrophobic, the extraction in (1) and (2) above is carried out by changing the organic solvent to any organic solvent, and various measurements are performed according to (4) to (9).

[0081] In a preferred embodiment of this design, the humectant SC is disposed on at least one of the following: the surface of a first region located on both outer sides in the width direction W of the sweat-absorbing sheet member (sweat-absorbing sheet) 46, and the surface of a second region located on both outer sides in the longitudinal direction L of the sweat-absorbing sheet member 46. Furthermore, the humectant SC is disposed in greater quantities on at least one of the following: the surface of the first region located on both outer sides in the width direction W of the sweat-absorbing sheet member 46, and the surface of the second region located on both outer sides in the longitudinal direction L of the sweat-absorbing sheet member 46, than on the surface of the sweat-absorbing sheet member 46.

[0082] In this disposable diaper 1, the moisturizing agent SC is distributed in greater quantities on the surface of the area surrounding the sweat-absorbing sheet member 46 than on the surface of the sweat-absorbing sheet member 46. This further suppresses skin dryness caused by excessive absorption of moisture from the skin by the sweat-absorbing sheet member 46. Therefore, in the disposable diaper 1, it is possible to further suppress skin problems caused by sweat while also further suppressing skin problems caused by moisture loss.

[0083] In a preferred embodiment of this product, the sweat-absorbing sheet member (sweat-absorbing sheet) 46 is hydrophilic, the humectant SC is hydrophilic, and the humectant SC is applied to the sweat-absorbing sheet member 46. In this way, in the disposable diaper 1, by applying a hydrophilic humectant SC to the hydrophilic sweat-absorbing sheet member 46, hydrogen bonding between hydrophilic fibers in the hydrophilic sweat-absorbing sheet member 46 can be suppressed, thereby increasing the flexibility of the sweat-absorbing sheet member 46. As a result, the adhesion of the sweat-absorbing sheet member 46 to the skin improves, and the sweat-absorbing performance of the sweat-absorbing sheet member 46 can be improved. At that time, the hydrophilic humectant SC applied to the hydrophilic sweat-absorbing sheet member 46 penetrates from the surface to the interior of the sweat-absorbing sheet member 46, and some of it is transferred to the skin, so only a small amount remains on the surface of the sweat-absorbing sheet member 46. As a result, the decrease in the sweat-absorbing performance of the sweat-absorbing sheet member 46 due to the humectant SC can be suppressed, and skin dryness caused by excessive absorption of moisture from the skin by the sweat-absorbing sheet member 46 can be suppressed more reliably.

[0084] However, the hydrophilicity of the sweat-absorbing sheet member 46 is evaluated by the following method. <Method for evaluating the hydrophilicity of sheet materials> (1) Cut the sheet material used in disposable diapers to a predetermined size (for example, 50 mm x 50 mm) and place it on the acrylic plate. (2) Drop 0.05 mL of colored water onto the cut sheet material from 30 mm above. After 10 minutes, measure the diffusion area of ​​the colored water using an image analysis device. A larger measurement value indicates hydrophilicity, and a smaller value indicates hydrophobicity.

[0085] In a preferred embodiment of this design, the sweat-absorbing sheet member (sweat-absorbing sheet) 46 contains absorbent fibers (for example, fibers included in the intermediate layer or the second layer, specifically rayon fibers and pulp fibers), and the proportion of absorbent fibers in the sweat-absorbing sheet member 46 is less in the skin-facing portion than in the non-skin-facing portion. In this embodiment, the amount of absorbent fibers in the first layer on the skin-facing side is less than that in the second layer on the non-skin-facing side.

[0086] In this disposable diaper 1, the inclusion of absorbent fibers in the sweat-absorbing sheet material 46 makes it easier to retain the moisturizer SC in the sweat-absorbing sheet material, and allows the flexibility of the sweat-absorbing sheet material 46 to be maintained for a long period of time. As a result, adhesion to the skin can be maintained for a long period of time, and the sweat-absorbing performance of the sweat-absorbing sheet material 46 can also be maintained for a long period of time. At that time, the proportion of absorbent fibers in the sweat-absorbing sheet material 46 is less on the skin side than on the non-skin side, so when the sweat-absorbing sheet material 46 absorbs sweat and is subjected to body pressure, it is possible to suppress the absorbed sweat from returning to the skin side, i.e., to the skin.

[0087] In a preferred embodiment of this design, a hydrophobic sheet member (hydrophobic sheet) is arranged on the non-skin side of the sweat-absorbing sheet member (sweat-absorbing sheet) 46. In this design, the hydrophobic sheet member on the non-skin side of the sweat-absorbing sheet member 46 includes, for example, an inner sheet member 31 and an inner sheet member 21, and an inner cover sheet member 43 and an inner cover sheet member 42 in the ventral portion 3 and the dorsal portion 2, and, for example, a leak-proof wall 6 in the absorbent body 4.

[0088] In this disposable diaper 1, a hydrophobic sheet member is positioned on the non-skin side of the sweat-absorbing sheet member 46. This prevents the moisturizer SC applied to the sweat-absorbing sheet member 46 from penetrating from the surface into the interior of the sweat-absorbing sheet member 46, thus suppressing its penetration to the non-skin side beyond the hydrophobic sheet member. As a result, the moisturizer SC can remain on the sweat-absorbing sheet member 46 for a longer period, maintaining the flexibility of the sweat-absorbing sheet member 46 for a longer period, thus maintaining adhesion to the skin for a longer period, and also maintaining the sweat-absorbing performance of the sweat-absorbing sheet member 46 for a longer period.

[0089] There are no particular restrictions on the basis weight of the humectant SC, as long as it can exert its moisturizing effect, but 0.3 g / m² is acceptable. 2 More than 2.5g / m 2 Preferably, the following: The humectant SC is at the lower limit (0.3 g / m²). 2 The moisturizing agent SC can exert its effect when it is above the upper limit (2.5 g / m²). Furthermore, when the moisturizing agent SC is applied to the sweat-absorbing sheet member 46, if the sweat-absorbing sheet member 46 is hydrophilic, the flexibility of the sweat-absorbing sheet member 46 can be increased, improving adhesion to the skin and enhancing sweat absorption performance. 2 By keeping the amount below a certain level, the stickiness of the moisturizer during application can be suppressed. Therefore, the optimal amount of moisturizer can achieve both moisturizing effect and stickiness suppression.

[0090] The method for measuring the basis weight of a humectant is as follows: <Method for measuring the basis weight of moisturizers> (1) Cut a portion of the nonwoven fabric coated with moisturizer from a disposable diaper to a predetermined size (e.g., 5cm x 5cm) and measure its mass. (2) If the humectant is hydrophilic, immerse the cut nonwoven fabric in a beaker containing a predetermined amount of water (for example, 500 ml). (3) After repeatedly poking or stirring the nonwoven fabric soaked in water with a glass rod for more than 5 minutes, leave it to stand in the water for 60 minutes. (4) After that, the moisture contained in the nonwoven fabric is thoroughly squeezed out, and it is dried in an oven at 50 degrees Celsius or higher for 24 hours or until its mass is measured. (5) Calculate the mass of the humectant applied to the nonwoven fabric from the difference between the mass of the nonwoven fabric after drying and the weight of the nonwoven fabric before immersion in water. Divide the mass of the humectant by the area of ​​the nonwoven fabric to obtain the basis weight of the humectant. (6) If the humectant is hydrophobic, immerse the nonwoven fabric cut in (2) in a beaker using a predetermined amount of any organic solvent. Then, carry out (3) to (5) in the same manner.

[0091] In a preferred embodiment of this design, the absorbent body 4 further includes a surface sheet 7 located on the skin side of the absorbent body 8 and having a sweat-absorbing function. The moisturizer SC is applied to the surface sheet 7. However, the moisturizer SC may be placed in part or all of the area of ​​the surface sheet 7 that overlaps with at least one of the ventral portion 3 and the dorsal portion 2 in the thickness direction T. In addition, the moisturizer SC may be further placed in all or part of the area that does not overlap with at least one of the ventral portion 3 and the dorsal portion 2 in the thickness direction T.

[0092] The surface sheet 7 of the absorbent body 4 is in contact with areas prone to sweating. Therefore, in this disposable diaper 1, the surface sheet 7 is given a sweat-absorbing function, and a moisturizing agent SC is placed on the surface sheet 7. Because the surface sheet 7 has a sweat-absorbing function, it can absorb more sweat from the skin, and because the moisturizing agent SC is applied, concerns about excessive absorption of moisture from the skin and subsequent skin dryness can be eliminated. As a result, the skin is protected by the moisturizing agent SC, maintaining the skin's moisture level and suppressing skin problems caused by dryness. Therefore, in the disposable diaper 1, it is possible to suppress skin problems caused by sweat while also suppressing skin problems caused by moisture loss. In particular, having two sheet members, the sweat-absorbing sheet member 46 coated with the moisturizing agent SC and the surface sheet 7 with sweat-absorbing function, makes it possible to more reliably suppress skin problems.

[0093] In a preferred embodiment of this design, at least one of the ventral portion 3 and the dorsal portion 2 includes an elastic member that expands and contracts in the width direction W. The elastic member and the sweat-absorbing sheet member (sweat-absorbing sheet) 46 overlap in the thickness direction T. In this design, the elastic members in the ventral portion 3 and the dorsal portion 2 include, for example, waist elastic members 13 and 12.

[0094] In the areas where elastic members (e.g., waist elastic members 13, 12) are located on the ventral portion 3 or dorsal portion 2, the contraction of the elastic members can cause increased pressure on the skin, raising concerns about adverse effects on the skin. Therefore, in this disposable diaper 1, the elastic members (in the areas where they are located) and the sweat-absorbing sheet member 46 overlap in the thickness direction T, thereby easing the pressure on the skin, reducing the burden on the skin, and suppressing skin problems. In particular, when a hydrophilic moisturizer SC is applied to the hydrophilic sweat-absorbing sheet member 46, the sweat-absorbing sheet member 46 becomes more flexible as described above because the moisturizer SC is applied to the sweat-absorbing sheet member 46. When this flexible sweat-absorbing sheet member 46 and the elastic members, for example, the waist elastic members 12, 13 overlap in the thickness direction T, the contraction force of the elastic members makes the sweat-absorbing sheet member 46 more flexible, allowing it to adhere more closely to the wearer's skin. This allows for better absorption of the wearer's sweat, prevents excessive absorption of moisture from the skin, and suppresses skin problems.

[0095] In a preferred embodiment of this product, the sweat-absorbing sheet member (sweat-absorbing sheet) 46 is positioned on the back side 2. In this way, the sweat-absorbing sheet member 46 is positioned on the back side 2 so as to cover the back, where sweating is most likely to occur. This allows the sweat-absorbing effect of the sweat-absorbing sheet member 46 to be more pronounced. Therefore, unnecessary sweat is expelled, and necessary moisture is retained on the skin, thus suppressing skin problems caused by sweat and skin problems caused by dryness.

[0096] In a preferred embodiment of this disposable diaper 1, the coefficient of friction MIU value (average coefficient of friction) of the area where the moisturizer SC is placed is 0.5 or more and 1.10 or less. In this embodiment, the area where the moisturizer SC is placed can be, for example, at least one of the ventral portion 3 and the dorsal portion 2. By not having too high an MIU value (1.10 or less), there is not too much moisturizer SC, friction does not act strongly, and skin irritation can be suppressed. Also, by not having too low an MIU value (0.5 or more), the minimum necessary amount of moisturizer SC is present, and the surface of the material on which the moisturizer SC is placed can be prevented from directly touching the skin, thereby preventing skin damage due to friction. Therefore, skin problems can be suppressed.

[0097] <Method for measuring the average coefficient of friction (MIU value)> <Method for measuring the friction coefficient MIU value> (1) Take a 20cm x 20cm test piece from the nonwoven fabric coated with the moisturizer of the disposable diaper. If a test piece of this size cannot be taken, the size of the test piece may be changed as appropriate. (2) The test specimen is mounted on the smooth metal surface of the measuring device (Kato Tech Co., Ltd. automated surface testing machine KES-FB4AUTO-A). A 10mm x 10mm silicone terminal is used as the contact. The contact is pressed against the test specimen with a force of 50g and a tension of 400g. (3) Start the measuring device and slide the contactor at a speed of 1.0 mm / second to measure the coefficient of friction. However, the MIU value of the coefficient of friction shall be the average value of the coefficient of friction of the nonwoven fabric in the MD direction.

[0098] Figure 5 is a plan view of the unfolded state showing another application example (modified version) of the moisturizer SC in the disposable diaper 1 according to the embodiment of Figure 1. In this embodiment, compared to the application example in Figure 4, the moisturizer SC is applied to at least one of the ventral portion 3 and the dorsal portion 2 in a location that does not overlap with the absorbent body 4. In this modified version, it is applied to both the ventral portion 3 and the dorsal portion 2. In this case as well, the same effect as in Figure 4 can be obtained. Note that in Figure 5, the moisturizer SC may be applied to only one of the ventral portion 3 and the dorsal portion 2.

[0099] Figure 6 is a plan view of the unfolded state showing another application example (modified version) of the moisturizer SC in the disposable diaper 1 according to the embodiment of Figure 1. In this embodiment, compared to the application example in Figure 4, the moisturizer SC is applied only to both outer sides in the width direction W of the absorbent body 4 on at least one of the ventral portion 3 and the dorsal portion 2, and is not applied to the outer side in the longitudinal direction L of the absorbent body 4. In this modified version, it is applied to both the ventral portion 3 and the dorsal portion 2. In this case as well, the same effect as in Figure 4 can be obtained. Note that in Figure 6, the moisturizer SC may be applied to only one of the ventral portion 3 and the dorsal portion 2.

[0100] (Second Embodiment) Next, a second embodiment will be described. The disposable diaper 51 of this embodiment is of the tape type. Figures 7 and 8 show the disposable diaper 51 according to this embodiment. Figure 7 is a plan view showing an unfolded state of an example of the configuration of the disposable diaper 51. Figure 8 is a cross-sectional view along the widthwise center line CW in Figure 7. In this embodiment, the main differences from the first embodiment will be described.

[0101] The disposable diaper 51 comprises an abdominal portion 53, a dorsal portion 52, and an absorbent body 54. The abdominal portion 53 and the dorsal portion 52 are the parts of the disposable diaper 1 that cover the wearer's abdomen and back, respectively. In this embodiment, when the disposable diaper 51 is divided into three equal parts in the longitudinal direction L, the abdominal portion is demarcated by the abdominal portion 53, the dorsal portion is demarcated by the dorsal portion 52, and the central portion is demarcated by the central portion 50. The absorbent body 54 is the part of the disposable diaper 51 that covers the wearer's crotch area and includes an absorbent material 58. At least the front and rear ends of the absorbent body 54 in the longitudinal direction L extend to the central portion in the width direction W of the abdominal portion 53 and the dorsal portion 52, respectively.

[0102] In this embodiment, the front and rear ends of the absorbent body 54 are connected, for example, to the central portion in the width direction W of the ventral portion 53 and the dorsal portion 52, respectively, by an adhesive (example: hot melt adhesive, the same applies hereinafter). In this case, the front and rear ends of the absorbent body 54 reach the outer ends in the longitudinal direction L of the ventral portion 53 and the dorsal portion 52, respectively, but they may also reach approximately the central portion in the longitudinal direction L.

[0103] The disposable diaper 51 includes an outer sheet member 60 located on the non-skin side of the absorbent body 54, and a pair of side sheet members 70 positioned at both ends in the width direction W on the skin side of the absorbent body 54 and extending in the longitudinal direction L.

[0104] The outer sheet member 60 constitutes the non-skin side of the disposable diaper 51 and holds the absorbent body 54 from the non-skin side. The outer sheet member 60 can be made of the same material as the outer sheet member 14 described above, for example, a liquid-impermeable and breathable nonwoven fabric.

[0105] Each of the pair of side sheet members 70 can be made of the same material as the previously described inner sheet members 21 and 31, and is preferably made of a nonwoven fabric containing hydrophobic fibers, and is particularly preferably made of a surface portion of the skin-contacting surface containing hydrophobic fibers. Each of the pair of side sheet members 70 has, in the inner portion in the width direction W, a fixing portion (not shown) that fixes both ends in the longitudinal direction L to the absorbent body 54, and a leak-proof wall 56 located between the fixing portions at both ends. In the leak-proof wall 56, the outer end in the width direction W is fixed to the absorbent body 54, forming a fixed end (not shown), and the inner end in the width direction W is not fixed, forming a free end (not shown). The leak-proof wall 56 includes an elastic member 56a extending along the longitudinal direction L at the inner end in the width direction W. The elastic member 56a is made of an elastic material such as rubber thread.

[0106] The disposable diaper 1 further includes a sweat-absorbing sheet member (sweat-absorbing sheet) 76 disposed on at least one of the skin-contacting surfaces of the ventral portion 53 and the dorsal portion 52. The sweat-absorbing sheet member 76 is a sheet that absorbs the wearer's sweat, and in this embodiment, it is disposed on the skin-facing surface so as to cover at least one of the ventral and dorsal ends in the longitudinal direction L of the absorbent body 54 from the skin side. In the example of Figure 7, the sweat-absorbing sheet member 76 is disposed on the dorsal portion 52.

[0107] The composition of the sweat-absorbing sheet member 76, such as the layer structure, fibers, basis weight, and materials, is the same as that of the sweat-absorbing sheet member 46.

[0108] The absorbent body 54 includes a surface sheet 57, a back sheet 59, and an absorbent body 58 located between the surface sheet 57 and the back sheet 59, and may include grooves (not shown) that allow the liquid to diffuse in the longitudinal direction L and the width direction W. The absorbent body 58 includes an absorbent core 58b and a core wrap 58a enclosing the absorbent core 58b. The materials of the surface sheet 57, the absorbent body 58 (core wrap 58a, absorbent core 58b), and the back sheet 59 are the same as those of the surface sheet 7, absorbent body 8 (core wrap 8a, absorbent core 8b), and back sheet 9 of the first embodiment.

[0109] The disposable diaper 51 comprises a pair of engagement tapes 75 extending outward on both sides in the width direction W of the dorsal portion 52, and a target tape 73 located in the center of the width direction W of the ventral portion 53, which serves as a target area for engaging the pair of engagement tapes 75. The target tape 73 is fixed to the non-skin side of the outer sheet member 60 with adhesive. Each of the pair of engagement tapes 75 comprises a plurality of hook-shaped fibrous bodies, and the target tape 73 is a fibrous structure comprising a plurality of loop-shaped fibrous bodies.

[0110] The disposable diaper 51 is equipped with multiple elastic members 55a for leg gathering. The multiple elastic members 55a extend along the longitudinal direction L between the ends on both sides in the width direction W of the back sheet 59 and the outer sheet member 60. The elastic members 55a are made of an elastic material such as elastic thread.

[0111] The disposable diaper 51 may be provided with an expandable member 72 that extends along the width direction W and expands and contracts in the width direction W, located in the center of the width direction W on the non-skin side surface of the dorsal portion 52.

[0112] In the disposable diaper 1, each component—a pair of side sheet members 70, a pair of engagement tapes 75, a surface sheet 57, an absorbent body 58, a back sheet 59, an outer sheet member 60, and a target tape 73—is joined to adjacent materials with adhesive. The absorbent core 58b is joined to the core wrap 58a with adhesive.

[0113] In this embodiment, the ventral portion 53, the central portion 50, and the dorsal portion 52 are mainly composed of a pair of side sheet members 70 and an outer sheet member 60.

[0114] In this embodiment, the ventral portion 53 may include a ventral cover sheet member (not shown) positioned on the skin-facing surface so as to cover the ventral end of the absorbent body 54 in the longitudinal direction L from the skin side. The ventral cover sheet member prevents the ventral end of the absorbent body 54 from directly touching the wearer's skin, thereby suppressing skin friction. Similarly, the dorsal portion 52 may include a dorsal cover sheet member 77 positioned on the skin-facing surface so as to cover the dorsal end of the absorbent body 54 in the longitudinal direction L from the skin side. The dorsal cover sheet member 77 prevents the dorsal end of the absorbent body 54 from directly touching the wearer's skin, thereby suppressing skin friction. The ventral cover sheet member and the dorsal cover sheet member 77 are made of the same material as the inner sheet members 31 and 21, for example. When the ventral cover sheet member and the dorsal cover sheet member 77 are provided, the sweat-absorbing sheet member 76 is generally placed on top of the ventral cover sheet member and the dorsal cover sheet member 77.

[0115] Next, the application of the moisturizer in this embodiment will be described. The disposable diaper 51 (absorbent article) is equipped with a moisturizer and a sweat-absorbing sheet member (sweat-absorbing sheet) 76 on at least one of the skin-contacting surface (skin-facing surface) of the ventral portion 3 and the skin-contacting surface (skin-facing surface) of the dorsal portion 2.

[0116] Figure 9 is a plan view of the unfolded state showing an example of application of the moisturizer SC in the disposable diaper 51 according to the second embodiment of Figure 7. In this embodiment, the sweat-absorbing sheet member (sweat-absorbing sheet) 76 is placed on the skin-facing surface of the dorsal portion 52. The moisturizer SC is applied (placed) on the skin-contact surfaces 53S, 52S (skin-facing surfaces) of both the ventral portion 53 and the dorsal portion 52, and on the skin-contact surface 76S of the sweat-absorbing sheet member 76 on the dorsal portion 52. Therefore, in the dorsal portion 52, the moisturizer SC is placed on the sweat-absorbing sheet member 76 and in the area surrounding the sweat-absorbing sheet member 76.

[0117] If the moisturizing agent SC is applied to the ventral portion 53, it is applied to at least the side sheet member 70 (including the leak-proof wall 56) of the ventral portion 53. If a ventral cover sheet member (not shown) is provided, it is further applied to the skin-contact surface of the ventral cover sheet member, and if a sweat-absorbing sheet member (not shown) is provided, it is further applied to the skin-contact surface of the sweat-absorbing sheet member. Similarly, if the moisturizing agent SC is applied to the dorsal portion 52, it is applied to at least the side sheet member 70 (including the leak-proof wall 56) of the dorsal portion 52. If a dorsal cover sheet member 77 is provided, it is further applied to the skin-contact surface of the dorsal cover sheet member 77, and if a sweat-absorbing sheet member 76 is provided, it is further applied to the skin-contact surface 76S of the sweat-absorbing sheet member 76.

[0118] In this embodiment, the moisturizing agent SC is further applied to the skin-contacting surface 50S of the central portion 50, that is, to the side sheet member 70 (including the leak-proof wall 56) of the central portion 50. In this embodiment, the moisturizing agent SC is also applied to the skin-contacting surface (surface sheet 57 of the absorbent body 54) of the absorbent body 54. The areas in the ventral portion 53, central portion 50, dorsal portion 52, and sweat-absorbing sheet member 76 where the moisturizing agent SC is applied / placed can be called the areas 53EA, 50EA, 52EA, and 76EA where the moisturizing agent SC exists.

[0119] Figure 10 is a plan view of the unfolded state showing another example of application of the moisturizer SC in the disposable diaper 51 according to the second embodiment of Figure 7. In this example, compared to the example in Figure 10, the moisturizer SC is not applied (not placed) in the central part 50 (the part covering the crotch).

[0120] In this second embodiment, the same effects as in the first embodiment can be obtained.

[0121] In this embodiment, the disposable diaper 51 (absorbent body 54) further comprises a pair of side sheet members 70 (side flaps) provided on both sides in the width direction W. Each of the pair of side sheet members 70 contains hydrophobic fibers in the surface portion of the skin-contacting surface. When the disposable diaper 51 is packaged, each of the pair of side sheet members 70 is located outside both end edges in the width direction W of the absorbent body 58 and is folded in the width direction W along a fold line FL that extends along the longitudinal direction L. The moisturizer SC is placed on the skin-facing surface of each of the pair of side sheet members 70 in the overlapping area when each of the pair of side sheet members 70 is folded along the fold line FL.

[0122] In this case, the outer region located outside the width direction W of the fold line FL and the inner region located inside the fold line overlap when the side sheet member 70 is folded. Therefore, the moisturizer SC applied to the outer region and the moisturizer applied to the inner region overlap when the side sheet member 70 is folded. As a result, the moisturizer SC in the outer and inner regions is not transferred to any other sheet member or anywhere else until the disposable diaper 51 is put on. Therefore, it is difficult to reduce the amount of moisturizer on the side sheet member 70. This makes it easier to detect the area where the moisturizer SC is placed in a wipe test, and the moisturizer's effect can be fully obtained when the diaper is put on.

[0123] Furthermore, each of the pair of side sheet members 70 is folded along the widthwise center line CW in the longitudinal direction L when the disposable diaper 51 is packaged. The moisturizer SC is placed on the skin-facing surface of each of the pair of side sheet members 70 in the overlapping area when each of the pair of side sheet members 70 is folded along the widthwise center line CW. Therefore, until the disposable diaper 51 is put on, the moisturizer SC in the areas ventral and dorsal to the widthwise center line CW is not transferred to any other sheet members or anywhere else. Thus, it is difficult to reduce the amount of moisturizer on the side sheet members 70. This makes it easier to detect the area where the moisturizer SC is placed in a swab test, and the moisturizer's effect can be fully obtained when the diaper is put on. [Examples]

[0124] The present invention will be described below based on examples, but the present invention is not limited to these examples.

[0125] (1) Sample A sweat-absorbing sheet member according to the first embodiment was prepared. The sweat-absorbing sheet member consists of a first layer of polyethylene terephthalate (PET) fiber nonwoven fabric with a hydrophilic fiber surface, a second layer of rayon fiber nonwoven fabric, and an intermediate layer of pulp fiber tissue, with a basis weight of 40 g / cm². 2 The material used was a sweat-absorbing sheet material with a basis weight of 0 g / cm². 2(Comparative example), 0.5g / cm 2 1.5 g / cm³ 2 2.5 g / cm³ 2 The humectants of (Examples 1-3) were applied. The humectants used contained 70% by mass of glycerin and 30% by mass of water under conditions of 20°C and 60% RH relative humidity.

[0126] (2) Evaluation The MIU values ​​for the sweat-absorbing sheet members of Examples 1-3 and Comparative Example 1 were measured using the average friction coefficient (MIU value) measurement method described above.

[0127] (3) Results The evaluation results are shown in Table 1. [Table 1] Moisturizer 0.3-2.5g / m 2 For the sweat-absorbing sheet material coated within this range, the MIU value was in the range of 0.5 to 1.10. It is thought that a MIU value that is not too high prevents strong friction and suppresses skin irritation, and a MIU value that is not too low ensures that the minimum necessary amount of moisturizer is present, thus preventing the surface of the material containing the moisturizer from directly contacting the skin. This is thought to suppress skin damage caused by friction and thus prevent skin problems.

[0128] The disposable diapers of the present invention are not limited to the embodiments described above, and can be combined with or modified with known technologies as appropriate, without departing from the purpose and spirit of the present invention. [Explanation of Symbols]

[0129] 1. Disposable diapers 2 Dorsal part 3 Ventral part 46 Sweat-absorbing sheet material SC Moisturizer

Claims

1. An absorbent article having longitudinal, widthwise, and thicknesswise directions that are mutually perpendicular when unfolded, comprising an abdominal portion that covers the wearer's abdomen, a dorsal portion that covers the back, and an absorbent body that covers the groin area and includes an absorbent material, wherein the front and rear ends in the longitudinal direction of the absorbent body extend to the central portion in the widthwise direction of the abdominal portion and the dorsal portion, respectively, A sweat-absorbing sheet is placed on at least one of the skin-contacting surfaces of the ventral and dorsal portions, A moisturizer applied to at least one of the skin-contacting surfaces of the ventral and dorsal portions, It also has, Absorbent material.

2. The moisturizing agent is disposed on at least one of the surfaces of a first region located on both outer sides in the width direction of the sweat-absorbing sheet, and a second region located on both outer sides in the longitudinal direction of the sweat-absorbing sheet, on at least one of the ventral and dorsal portions. The humectant is distributed in greater quantities on at least one of the surfaces of the first region and the second region than on the surface of the sweat-absorbing sheet. The absorbent article according to claim 1.

3. The sweat-absorbing sheet is hydrophilic, and the moisturizing agent is hydrophilic. The aforementioned moisturizer is applied to the sweat-absorbing sheet. The absorbent article according to claim 1 or 2.

4. The sweat-absorbing sheet contains absorbent fibers, In the sweat-absorbing sheet, the proportion of absorbent fibers is less in the skin-facing portion than in the non-skin-facing portion. The absorbent article according to claim 3.

5. A hydrophobic sheet is placed on the non-skin side of the sweat-absorbing sheet. The absorbent article according to claim 3.

6. The absorbent body further includes a surface sheet located on the skin side of the absorbent body and having a sweat-absorbing function. The aforementioned humectant is applied to the surface sheet. The absorbent article according to claim 1 or 2.

7. The basis weight of the aforementioned humectant is 0.3 g / m². ２ Above, 2.5g / m ２ The following is: The absorbent article according to claim 1 or 2.

8. At least one of the ventral portion and the dorsal portion includes an elastic member that expands and contracts in the width direction, The elastic member and the sweat-absorbing sheet overlap in the thickness direction. The absorbent article according to claim 1 or 2.

9. The sweat-absorbing sheet is located on the back side, The absorbent article according to claim 1 or 2.

10. The friction coefficient MIU value of the area where the humectant is placed is 0.5 or greater and 1.10 or less. The absorbent article according to claim 1 or 2.

11. The aforementioned humectant contains 45% by mass or more of a hygroscopic humectant under conditions of a temperature of 20°C and a relative humidity of 60% RH. The absorbent article according to claim 1 or 2.

12. The aforementioned hygroscopic humectant contains glycerin. The absorbent article according to claim 11.

13. The aforementioned humectant further comprises a preservative aid. The absorbent article according to claim 11.

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