Absorbent articles

Abstract

To provide an absorbent article that can suppress shifting and other issues while also suppressing skin problems. [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. A moisturizing agent SC is applied to the outer side in the width direction of at least one of the ends of the absorbent body 4 in the width direction 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] Because the epidermis of infants and young children is only about half as thick as that of adults and is prone to skin problems, absorbent articles with moisturizers on the surface sheet are known to protect the skin of infants and young children from irritation from feces and urine when absorbent articles are worn. For example, Patent Document 1 discloses an absorbent article in which a moisturizer containing 70% or more by mass of glycerin is applied to the surface sheet. Patent Document 2 also discloses an absorbent article in which a water-soluble skincare agent is present on part or all of the surface sheet, and an oil-based skincare agent is present on at least a portion of the water-soluble skincare agent that is closer to the wearer's skin than the water-soluble skincare agent. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Patent No. 7266554 [Patent Document 2] Patent No. 4084278 [Overview of the project] [Problems that the invention aims to solve]

[0004] In absorbent products, an abdominal and dorsal portion with elastic material is provided so as to surround the waist of the infant when worn. By utilizing the contractile stress of this material, the adhesion between the absorbent product and the waist is appropriately increased, while suppressing shifting of the absorbent product and urine leakage (hereinafter also referred to as "shifting, etc.").

[0005] However, for example, in infants with sensitive skin or those who are very active, the contractile stress on the ventral and dorsal sides can become too strong. In such situations, the materials that make up the skin-contacting surfaces on the ventral and dorsal sides rub against the skin of the infant's waist, potentially causing the stratum corneum and sebum to peel off the skin's surface. In such cases, the skin's barrier function is weakened, leading to skin problems such as dry skin and eczema.

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

[0007] The absorbent article of the present invention has longitudinal, widthwise, and thicknesswise directions that are mutually orthogonal when unfolded, and comprises an abdominal portion that covers the wearer's abdomen, a dorsal portion that covers the back, and an absorbent body that covers the groin and includes an absorbent material, wherein the absorbent body has front and rear ends in the longitudinal direction that extend to the central portion in the widthwise direction of the abdominal portion and the dorsal portion, respectively, and a moisturizing agent is applied to the outer side in the widthwise direction of at least one of the ends of the absorbent body in the widthwise direction on 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 shifting of the absorbent article while suppressing skin problems. [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]It is a plan view in a developed state showing an example of application of a moisturizing agent in FIG. 1. [Figure 5] It is a plan view in a developed state showing another example of application of the moisturizing agent in FIG. 1. [Figure 6] It is a plan view in a developed state showing another example of application of the moisturizing agent in FIG. 1. [Figure 7] It is a plan view in a developed state showing another example of application of the moisturizing agent in FIG. 1. [Figure 8] It is a plan view in a developed state showing a configuration example of an absorbent article according to the second embodiment. [Figure 9] It is a cross-sectional view taken along the center line CW in the width direction in FIG. 7. [Figure 10] It is a plan view in a developed state showing an example of application of the moisturizing agent in FIG. 7. [Figure 11] It is a plan view in a developed state showing another example of application of the moisturizing agent in FIG. 7.

Mode for Carrying Out the Invention

[0010] This embodiment relates to the following aspects.

[0011] [Aspect 1] It has a longitudinal direction, a width direction, and a thickness direction that are orthogonal to each other in a developed state, and includes a ventral part that covers the wearer's abdomen, a dorsal part that covers the back, and a crotch part, and an absorbent main body that includes an absorber. The absorbent main body is an absorbent article in which the front and rear end portions in the longitudinal direction extend to the central portions in the width direction of the ventral part and the dorsal part, respectively. On at least one of the skin contact surfaces of the ventral part and the dorsal part, a moisturizing agent is applied to the outside in the width direction of at least one of the both end portions in the width direction of the absorbent main body.

[0012] The ventral and dorsal portions that surround the waist can suppress the displacement of the absorbent article, etc., but due to the movement of the wearer's body such as walking, rubbing against the skin of the waist is likely to occur. Therefore, in this absorbent article, a moisturizing agent is applied to the outside in the width direction of at least one of the two ends in the width direction of the absorbent body on at least one of the skin contact surfaces of the ventral and dorsal portions, that is, at a location where rubbing against the skin of the waist is likely to occur. By applying a moisturizing agent to the skin contact surface of the ventral and / or dorsal portions, the friction between the member constituting the skin contact surface and the skin can be reduced. Furthermore, since the moisturizing agent on the surface of the member is transferred to the skin, the skin can be protected by the moisturizing agent. Furthermore, since the surface of the skin is covered with the moisturizing agent, the evaporation of moisture from the skin can be prevented, and the moisture of the skin can be maintained. And since the moisture of the skin can be maintained, even if friction occurs, it is possible to make it difficult to cause abrasions.

[0013] [Aspect 2] The absorbent article according to Aspect 1, wherein the moisturizing agent is applied to the outside in the width direction of each of the two ends in the width direction of the absorbent body on at least one of the skin contact surfaces of the ventral and dorsal portions.

[0014] In this absorbent article, a moisturizing agent is applied to the outside in the width direction of both ends in the width direction of the absorbent body on at least one of the skin contact surfaces of the ventral and dorsal portions. Thereby, the friction between the member constituting the skin contact surface and the skin can be further reduced. Furthermore, since the moisturizing agent on the surface of the member is transferred to the skin, the skin can be further protected by the moisturizing agent. Furthermore, since the surface of the skin is covered with the moisturizing agent, the evaporation of moisture from the skin can be further prevented, and the moisture of the skin can be further maintained. And since the moisture of the skin can be maintained, even if friction occurs, it is possible to make it more difficult to cause abrasions.

[0015] [Aspect 3] The absorbent article according to Aspect 1 or 2, wherein the moisturizing agent is applied continuously or intermittently from one end to the other end in the width direction of at least one of the ventral and dorsal portions.

[0016] In this absorbent article, a moisturizer is applied continuously or intermittently from one end to the other on at least one of the ventral and dorsal sides. This reduces friction over a wide area of ​​the waist. Furthermore, since the area over which the moisturizer on the surface of the material constituting the skin-contact surface is transferred to the skin can be widened, the area of ​​the waist that can be protected by the moisturizer can be widened.

[0017] [Aspect 4] The absorbent article according to any one of embodiments 1 to 3, wherein the humectant is applied to the ends of the absorbent in the longitudinal and / or width directions so as to overlap in the thickness direction.

[0018] In the longitudinal and / or widthwise directions, the ends of the absorbent material are highly rigid, while the parts outside the ends are less rigid. Due to this difference in rigidity, friction is likely to occur between the ends of the absorbent material and the skin of the waist. Therefore, in this absorbent product, a moisturizing agent is applied to the ends of the absorbent material in the longitudinal and / or widthwise directions, where the rigidity is highest. This reduces friction between the ends of the absorbent material and the skin of the waist, thereby suppressing skin problems caused by friction.

[0019] [Aspect 5] The absorbent article according to any one of embodiments 1 to 4, wherein the humectant is not applied to the outer end in the longitudinal direction of at least one of the ventral and dorsal portions.

[0020] When clothing comes into contact with a moisturizer, the fibers of the clothing can be absorbed by the moisturizer, and the accumulation of these absorbed fibers may have adverse effects on the skin. Furthermore, the absorbed fibers can look like dirt, and consequently, the absorbent material may appear unsanitary. Therefore, in this absorbent material, the moisturizer is not applied to the outer longitudinal edge of at least one of the ventral and dorsal sides. Thus, it is possible to prevent clothing fibers from being absorbed by the outer longitudinal edges of the ventral and dorsal sides, which are prone to contact with the wearer's clothing. This reduces adverse effects on the skin caused by absorbed fibers and prevents the absorbent material from appearing unsanitary.

[0021] [Aspect 6] The absorbent article according to any one of embodiments 1 to 5, wherein the humectant is not applied to the inner end in the longitudinal direction of at least one of the ventral and dorsal portions.

[0022] When clothing or floor surfaces come into contact with the moisturizer, clothing fibers and floor dust can be absorbed by the moisturizer. The accumulation of these absorbed fibers and dust can potentially have adverse effects on the skin. Furthermore, the absorbed fibers and dust can resemble dirt, potentially making the absorbent material unsanitary. Therefore, this absorbent material does not have moisturizer applied to the inner longitudinal edge of at least one of the ventral and dorsal sides. This prevents clothing fibers and floor dust from being absorbed by the inner longitudinal edges of the ventral and dorsal sides, which are more likely to come into contact with the wearer's clothing or floor surface. This reduces adverse effects on the skin from absorbed fibers and dust, and prevents the absorbent material from appearing unsanitary.

[0023] [Aspect 7] The absorbent article according to embodiment 1 or 2, further comprising at least one of a pair of leak-proof walls and a pair of leg gather portions, wherein the moisturizing agent is further applied to at least one of the pair of leak-proof walls and the pair of leg gather portions.

[0024] In this absorbent garment, a moisturizing agent is applied to the leak-proof walls and leg gathers located around the legs, where friction occurs due to the wearer's movements. Therefore, friction between the materials constituting the leak-proof walls and leg gathers and the skin can be reduced. As a result, friction can be reduced even around the legs near the waist, thus suppressing skin problems caused by friction.

[0025] [Aspect 7] The absorbent article according to any one of embodiments 1 to 6, wherein the absorbent article is a pant-type disposable diaper, and the moisturizer is further applied to the skin-contacting surface at the widthwise end of the side seal portion that joins the ventral portion and the dorsal portion.

[0026] The side seals that join the ventral and dorsal portions are joined by heat sealing or sonic sealing, and hardened areas exist within them. If these areas come into contact with the skin, there is a risk of skin damage. Therefore, in this absorbent article, a moisturizer is applied to the hardened areas as well. This reduces friction between the skin and the hardened areas of the side seals. Furthermore, the moisturizer on the surface of the side seals is transferred to the skin, protecting it and preventing moisture evaporation, thus maintaining skin hydration. As skin hydration is maintained, even if friction occurs, abrasions are less likely to occur.

[0027] [Aspect 8] The absorbent article according to embodiment 7, wherein the humectant is further applied to the respective joining surfaces of the ventral and dorsal portions of the side seal portion.

[0028] The ventral and dorsal surfaces of the side seal come into contact with each other during joining and are joined by heat sealing or sonic sealing. Therefore, in this absorbent article, a humectant is applied to each joining surface. Consequently, the joining strength of the heat-sealed or sonic-sealed surfaces can be moderately reduced. As a result, when the absorbent article is attached, the joining between the ventral and dorsal surfaces can be maintained with a moderate joining strength, and when the absorbent article is removed, the joining can be easily torn into the ventral and dorsal surfaces.

[0029] [Aspect 9] The absorbent article according to embodiment 7, wherein the humectant is further applied to the central part in the longitudinal direction of the joint surfaces of the ventral and dorsal parts of the side seal portion, but not to both ends in the longitudinal direction.

[0030] The ventral and dorsal joining surfaces of the side seal come into contact with each other during joining and are joined by heat sealing or sonic sealing. In this absorbent article, a humectant is applied to the longitudinal center of each joining surface, but not to both ends. Therefore, the joining strength of the heat-sealed or sonic-sealed surfaces can be made lower in the longitudinal center and higher at both ends. As a result, when the absorbent article is attached, the joining strength at both ends is high, maintaining the connection between the ventral and dorsal surfaces, and when the absorbent article is removed, once the ends are torn, the lower joining strength at the center allows for smooth tearing.

[0031] [Aspect 10] The absorbent article according to any one of embodiments 1 to 9, wherein at least one of the ventral portion and the dorsal portion includes a moisturizing sheet having a region where the moisturizing agent is present and a colored sheet having a colored region, and at least a portion of the region where the moisturizing agent is present and the colored region overlap in the thickness direction.

[0032] In this absorbent article, the area containing the humectant in the moisturizing sheet and at least a portion of the colored area in the colored sheet overlap in the thickness direction. Therefore, the area containing the humectant in the absorbent article can be visually identified. This allows the absorbent article to be applied so that the area containing the humectant is in contact with the appropriate location on the skin. Furthermore, the absorbent article can be applied with minimal contact with the area containing the humectant, thereby suppressing the removal of the humectant from the absorbent article. Thus, the friction-reducing effect of the humectant and its effect of transferring to the skin and protecting it can be reliably achieved.

[0033] [Aspect 11] The absorbent article according to embodiment 10, wherein the colored sheet is the moisturizing sheet, the colored region is located on one or the other surface of the moisturizing sheet, and at least a portion of the area present overlaps with the colored region.

[0034] In this absorbent article, the colored sheet and the moisturizing sheet are identical. The colored area is located on one side of the moisturizing sheet, i.e., the side with the area of ​​presence, or the other side opposite it. Consequently, at least a portion of the area of ​​presence inevitably overlaps with the colored area in the thickness direction. This allows for a more reliable determination of the location of the area of ​​presence based on the location of the colored area. Therefore, the absorbent article can be applied with minimal contact with the moisturizer, ensuring that the area of ​​presence makes proper contact with the skin. Thus, the friction-reducing and skin-protecting effects of the moisturizer can be reliably achieved.

[0035] [Aspect 12] The absorbent article according to any one of embodiments 1 to 11, wherein each of the ventral and dorsal portions comprises an inner sheet located on the skin side, the skin-facing surface of which constitutes the skin-contacting surface, and an outer sheet located on the non-skin side of the inner sheet, the inner sheet having hydrophobic fibers on the skin-contacting surface, and the moisturizer being a hydrophilic agent.

[0036] In this absorbent article, a moisturizer is applied to the skin-contacting surface of the inner sheet on at least one of the ventral and dorsal sides, and this skin-contacting surface contains hydrophobic fibers. By applying a hydrophilic moisturizer to the surface of the inner sheet containing hydrophobic fibers in this way, it is possible to make it difficult for the moisturizer to penetrate the inner sheet. As a result, the effects of the moisturizer applied to the inner sheet, such as the effect of reducing friction and the effect of transferring to the skin and protecting the skin, can be exerted more effectively, and the moisturizing effect can be produced even with a small amount.

[0037] [Aspect 13] The absorbent article according to embodiment 12, wherein the inner sheet and the outer sheet are joined together with a hydrophobic adhesive.

[0038] In this absorbent material, the inner and outer sheets are joined together with a hydrophobic adhesive. The hydrophobic adhesive inhibits the penetration of hydrophilic humectants from the inner sheet to the outer sheet. This allows the humectant applied to the inner sheet to exert its effect more reliably, and even a small amount of humectant can produce an effect.

[0039] [Aspect 14] The absorbent article according to embodiment 13, wherein the hydrophobic adhesive is scattered within the inner sheet and the outer sheet.

[0040] In this absorbent material, the hydrophobic adhesive that joins the inner and outer sheets is scattered throughout both the inner and outer sheets. As a result, the inner and outer sheets have both bonded areas with the hydrophobic adhesive and unbonded areas without adhesive. At the bonded areas, the hydrophobic adhesive inhibits the penetration of the hydrophilic humectant from the inner sheet to the outer sheet. Because the unbonded areas are thicker (there is a distance between the inner and outer sheets), the humectant has difficulty penetrating deeper into the inner sheet and, consequently, into the outer sheet. This allows the humectant applied to the inner sheet to exert its effect more reliably, and even a small amount of humectant can produce an effect.

[0041] [Aspect 15] The humectant is an absorbent article according to any one of embodiments 1 to 14, 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.

[0042] 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.

[0043] [Aspect 16] The absorbent article according to embodiment 15, wherein the hygroscopic humectant contains glycerin.

[0044] 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.

[0045] [Aspect 17] The absorbent article according to embodiment 15, wherein the humectant further comprises a preservative aid.

[0046] 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.

[0047] [Aspect 18] The absorbent article according to any one of embodiments 1 to 17, wherein each of the ventral and dorsal portions comprises a plurality of elastic members extending along the width direction and spaced apart in the longitudinal direction, the humectant is uniformly distributed in at least one of the ventral and dorsal portions when the plurality of elastic members are extended, and the amount of the humectant per unit area viewed from the thickness direction is greater in the region where the plurality of elastic members are most contracted in their natural state than in other regions.

[0048] In absorbent articles, when worn, the region where the multiple elastic members contract most when in their natural state, on at least one of the ventral and dorsal sides, is considered to be the region with the highest compression force. Therefore, in this absorbent article, the amount of humectant per unit area viewed from the thickness direction is increased in the region where the multiple elastic members contract most when in their natural state. By relatively increasing the amount of humectant in the region with high compression force in this way, the effect of the humectant can be more reliably achieved. In other words, it can attract moisture to the area around the skin, retain moisture on the skin surface, prevent evaporation of moisture from the skin, maintain skin moisture, reduce the likelihood of abrasions, and, by penetrating the skin, stabilize the lipid structure between skin cells, thereby suppressing evaporation of moisture from the skin. Furthermore, since the humectant is uniformly applied when the multiple elastic members are in their stretched state, even when the multiple elastic members return to their natural state and random wrinkles occur, a certain amount or more of humectant can be secured.

[0049] [Aspect 19] The absorbable article according to any one of embodiments 1 to 18, wherein a portion of the moisturizer is applied to the area of ​​the ventral and dorsal portions that overlaps with the wearer's iliac crest.

[0050] Friction between absorbent materials and skin is likely to occur around the iliac crest. Therefore, in this absorbent material, a portion of the moisturizer is applied to the ventral and dorsal areas that overlap with the iliac crest. By placing the moisturizer in areas prone to friction in this way, skin friction can be more effectively suppressed.

[0051] [Aspect 20] 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 19.

[0052] 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). 2By exceeding the upper limit (2.5 g / m²), the amount of moisturizer can attract moisture to 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. 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.

[0053] [Aspect 21] The absorbent article is a tape-type disposable diaper, further comprising a pair of side flaps extending outward from at least one of the ventral and dorsal portions in the width direction, wherein the moisturizer is applied to the skin-facing surface of each of the pair of side flaps in the area where they overlap when each of the pair of side flaps is folded, according to any one of embodiments 1 to 20.

[0054] In this absorbent product, a moisturizer is placed on the skin-facing surface of each side flap of the tape-type disposable diaper, in the area that overlaps when folded. Therefore, the moisturizer is not transferred anywhere until the absorbent product is put on. Consequently, the amount of moisturizer on the side flaps is less likely to decrease. This reduces friction between the skin and the side flaps. Furthermore, the moisturizer on the surface of the side flaps is transferred to the skin, protecting it and preventing moisture evaporation, thus maintaining skin hydration. And because skin hydration is maintained, even if friction occurs, abrasions are less likely to occur.

[0055] [Aspect 22] The absorbent article according to any one of embodiments 1 to 21, wherein the friction coefficient MIU value of the area where the humectant is placed is 0.50 to 1.10.

[0056] In this absorbent material, the friction coefficient MIU value of the area where the humectant is placed is 0.50 to 1.10. A low MIU value prevents excessive friction, thus suppressing skin irritation. Furthermore, a low MIU value 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, thereby reducing skin damage caused by friction.

[0057] 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.

[0058] (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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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).

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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 or sheet-like rubber. 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.

[0074] 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. 2The length (thickness) of the sheet member in the thickness direction T is, for example, 0.1 to 5 mm, preferably 0.1 to 2 mm. The sheet members constituting the ventral portion 3 and the dorsal portion 2 may be two sheets, the inner sheet member and the outer sheet member, one sheet, or three or more sheets (not shown). The sheet members do not need to be folded (not shown). If each sheet member is a hydrophobic sheet, for example, if the sheet member contains hydrophobic fibers as the main constituent fibers, then a hydrophobic material can be selected from the above materials as the material for the fibers constituting the sheet member.

[0075] 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).

[0076] 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.

[0077] 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.

[0078] 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.

[0079] Examples of surface sheets 7 include liquid-permeable nonwoven or woven fabrics, synthetic resin films with liquid-permeable pores, and composite sheets thereof. Examples of backing sheets 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, and examples include 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 of the nonwoven fabrics and synthetic resin films as long as they can be used for sanitary products, but 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 and polybutylene terephthalate. Cellulose fibers may be used as the material for the nonwoven fabric. To provide breathability, the synthetic resin film may contain inorganic particles such as calcium carbonate.

[0080] The absorber 8 includes an absorption core 8b that absorbs and holds liquid, and a core wrap 8a that encloses the absorption core 8b, and may include a groove portion that can diffuse the liquid in the longitudinal direction L and the width direction W. Examples of the material of the absorption core 8b include at least one of an absorber material, such as cellulose-based fibers and superabsorbent polymers. Examples of the cellulose-based fibers include natural cellulose fibers such as pulp fibers like wood pulp fibers, crosslinked pulp fibers, and non-wood pulp fibers, 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 mm, preferably 2 to 5 mm. Examples of the superabsorbent polymer (Super Absorbent Polymer: SAP) include polyacrylate-based, polysulfonate-based, and maleate anhydride-based water-absorbent polymers. The average particle diameter of the superabsorbent polymer (when dry) is, for example, several hundreds of μm, preferably 200 to 500 μm. The basis weights of the cellulose-based fibers and the superabsorbent polymer are, for example, 100 to 400 g / m 2 may be mentioned. Examples of the material of the core wrap 8a include liquid-permeable sheets such as non-woven fabrics and tissues.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] Next, the application of the moisturizer in this embodiment will be described. The disposable diaper 1 (absorbent article) is equipped with a moisturizer applied to the outside of the width direction W at at least one of the skin-contacting surface 3S (skin-facing surface) of the ventral portion 3 and the skin-contacting surface 2S (skin-facing surface) of the dorsal portion 2. Preferably, the moisturizer is applied to the outside of the width direction W at each of the width directions W at at least one of the skin-contacting surface 3S (skin-facing surface) of the ventral portion 3 and the skin-contacting surface 2S (skin-facing surface) of the dorsal portion 2.

[0086] 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 to Figures 5 to 7, 10 and 11). In this embodiment, the moisturizer SC is applied (placed) on the outer side of the width direction W at each end of the width direction W of the absorbent body 4 on both the ventral portion 3 and the dorsal portion 2 (skin-facing surfaces) of the skin-contacting surfaces 3S and 2S. The areas to which the moisturizer SC is applied / placed on the ventral portion 3 and the dorsal portion 2 can be called the areas 3EA and 2EA where the moisturizer SC exists. Note that in Figure 4, the moisturizer SC may be applied to only one of the ventral portion 3 and the dorsal portion 2.

[0087] Specifically, when 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, and if a ventral cover sheet member 43 is provided, it is further applied to the ventral cover sheet member 43. Similarly, when 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, and if a dorsal cover sheet member 42 is provided, it is further applied to the dorsal cover sheet member 42.

[0088] However, the areas where the humectant SC is present in each sheet member (e.g., areas 3EA, 2EA) do not need to cover the entire surface of the skin-contacting surface of each sheet member (e.g., skin-contacting surfaces 3S, 2S). The areas where the humectant 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 humectant SC does not need to be present in only one sheet member; it may be present in multiple sheet members. The humectant SC may be present continuously or intermittently in a single sheet member. Intermittent presentation includes, for example, stripe patterns, checkerboard patterns, and grid patterns. The humectant SC may be present in multiple locations independently of each other in a single sheet member.

[0089] The ventral portion 3 and dorsal portion 2 surrounding the waist can suppress shifting of the absorbent material, but friction with the skin of the waist is likely to occur when the wearer moves their body, such as when walking. Therefore, in this disposable diaper 1 (absorbent material), a moisturizing agent SC is applied to the outer side in the width direction W of at least one of the skin-contacting surfaces 3S and 2S of the ventral portion 3 and dorsal portion 2, i.e., in the area where friction with the skin of the waist is likely to occur. By applying the moisturizing agent SC to the skin-contacting surfaces 3S and / or 2S of the ventral portion 3 and / or dorsal portion 2, friction between the material constituting the skin-contacting surfaces 3S and / or 2S (for example, the inner sheet material 31 and / or the inner sheet material 21) and the skin can be reduced. Furthermore, the moisturizing agent SC on the surface of the material is transferred to the skin, so the skin can be protected by the moisturizing agent SC. Furthermore, the moisturizing agent SC covers the surface of the skin, preventing moisture evaporation and maintaining skin hydration. Because skin hydration is maintained, even if friction occurs, abrasions are less likely to occur.

[0090] In particular, when the moisturizing agent SC is applied to the outer edges in the width direction at both ends of the absorbent body on the skin-contact surfaces 3S and / or 2S of the ventral portion 3 and / or dorsal portion 2, friction between the skin and the components constituting the skin-contact surfaces 3S and / or 2S can be further reduced. In this case, the moisturizing agent SC on the surface of the components is transferred to the skin, providing better protection for the skin. Furthermore, since the moisturizing agent SC covers the surface of the skin, it is possible to better prevent moisture evaporation from the skin and maintain skin moisture. As a result, even if friction occurs, abrasions are less likely to occur.

[0091] 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 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 includes, for example, glycerin, water, and an auxiliary agent.

[0092] Moisturizer SC preferably contains 45% by mass or more of a hygroscopic humectant under conditions of 20°C and 60% RH relative humidity. By containing 45% by mass or more of a hygroscopic humectant, it can attract moisture to the area around the skin, thus retaining moisture on the skin's surface. In addition, by covering the skin's surface with a hygroscopic humectant, 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 humectant penetrates the skin, it stabilizes the structure of lipids between skin cells, thereby suppressing moisture evaporation from the skin.

[0093] 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.

[0094] 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.

[0095] 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 a temperature of 20°C and a relative humidity of 60%RH, 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.

[0096] 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).

[0097] 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 is at the lower limit (0.3 g / m²). 2 By exceeding the upper limit (2.5g / m²), the moisturizer can attract moisture to 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. 2 By keeping the amount below this limit, it is possible to suppress the moisturizer from becoming sticky when applied, and also to prevent the moisturizer from getting caught on the legs, making it difficult to put on the disposable diaper. Therefore, it is possible to achieve both moisturizing effect and stickiness suppression effect with the optimal amount of moisturizer.

[0098] 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 immersing the nonwoven fabric in water, repeatedly poke and stir it irregularly with a glass rod for more than 5 minutes, then leave it undisturbed in 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 more, and 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.

[0099] In the example shown in Figure 4, the moisturizing agent SC is also applied to the outer edges of the absorbent body 4 in the longitudinal direction L, on the outer edges of the outer edges in the longitudinal direction L, on both the skin-contact surfaces 3S and 2S of the ventral portion 3 and the dorsal portion 2. Furthermore, the moisturizing agent SC is also applied to the skin-contact surfaces 4FS and 4BS of the absorbent body 4 (surface sheet 7 of the absorbent body 4, leg sheet member 5b, and leak-proof sheet member 6b) that overlap with the ventral portion 3 and the dorsal portion 2. If a dorsal cover sheet member 42 and a ventral cover sheet member 43 are provided, the moisturizing agent SC is also applied to those cover sheet members.

[0100] In a preferred embodiment of this design, the humectant SC is applied continuously or intermittently from one end to the other in the width direction W of at least one of the ventral portion 3 and the dorsal portion 2. In the example shown in Figure 4, the humectant SC is applied continuously from one end to the other in the width direction W of both the ventral portion 3 and the dorsal portion 2.

[0101] The moisturizing agent SC on at least one of the ventral portion 3 and the dorsal portion 2 reduces friction over a wide area of ​​the wearer's waist. Furthermore, the area over which the moisturizing agent SC is transferred to the wearer's skin can be increased, on the surface of at least one of the members constituting the skin-contact surface 3S of the ventral portion 3 (e.g., inner sheet member 31) and the member constituting the skin-contact surface 2S of the dorsal portion 2 (e.g., inner sheet 21). This increases the area of ​​the waist that can be protected by the moisturizing agent SC.

[0102] In a preferred embodiment of this design, the humectant SC is applied to the ends of the absorbent material 8 contained in the absorbent body 4 in the longitudinal direction L and / or width direction W, overlapping in the thickness direction T. In the example shown in Figure 4, the humectant SC is applied to both the ventral and dorsal ends in the longitudinal direction L, and both the left and right ends in the width direction W, overlapping in the thickness direction T.

[0103] In the longitudinal direction L and / or the width direction W, the ends of the absorbent material 8 are highly rigid, while the parts outside the ends of the absorbent material 8 are less rigid. Due to this difference in rigidity, friction is likely to occur between the ends of the absorbent material 8 and the skin of the waist. Therefore, in this disposable diaper 1, by applying the moisturizing agent SC to the ends of the absorbent material 8 in the longitudinal direction L and / or the width direction W, where the rigidity is high, friction between the ends of the absorbent material 8 and the skin of the waist can be reduced, thereby suppressing skin problems caused by friction.

[0104] In a preferred embodiment of this design, in the pant-type disposable diaper 1, the moisturizing agent SC is further applied to the skin-contacting surfaces 3S and 2S at the ends in the width direction W of the side seal portion (the joint between the ventral joint portion 3a and the dorsal joint portion 2a) that joins the ventral portion 3 and the dorsal portion 2. In the example shown in Figure 4, the moisturizing agent SC is applied to the entire ends in the width direction W of the ventral portion 3 and the dorsal portion 2, including the side seal portion. Therefore, in the ventral portion 3 and the dorsal portion 2, the moisturizing agent SC is applied up to the edge between the side seal portion and the remaining portion, that is, to the boundary between the side seal portion and the remaining portion.

[0105] The side seals joining the ventral portion 3 and the dorsal portion 2 are joined by heat sealing or sonic sealing, and there is a hardened area at the edge between the side seals and the remaining portion. Therefore, if this hardened area comes into contact with the skin, there is a risk of skin damage. To address this, this disposable diaper 1 has a moisturizing agent SC applied to the hardened area. This reduces friction between the skin and the hardened area of ​​the side seal. Furthermore, the moisturizing agent SC on the surface of the side seal is transferred to the skin, protecting it and preventing moisture evaporation, thus maintaining skin hydration. As skin hydration is maintained, even if friction occurs, abrasions are less likely to occur.

[0106] In a preferred embodiment of this design, the humectant SC is further applied to the respective joining surfaces of the ventral portion 3 and the dorsal portion 2 of the side seal. In the example shown in Figure 4, the humectant SC is also applied to the ventral joining portion 3a and the dorsal joining portion 2a that constitute the side seal. The ventral joining portion 3a and the dorsal joining portion 2a are then overlapped in the thickness direction T and joined by heat sealing or sonic sealing to form the side seal.

[0107] Thus, in this disposable diaper 1, a moisturizer is applied to the joint surfaces (ventral joint 3a and dorsal joint 2a) of the ventral portion 3 and dorsal portion 2 in the side seal area. Therefore, the bonding strength of the joint surface, which is achieved by heat sealing or sonic sealing, can be appropriately reduced by the moisturizer. As a result, when the disposable diaper 1 is put on, the joint between the ventral portion 3 and the dorsal portion 2 can be maintained with an appropriate bonding strength, and when the disposable diaper 1 is removed, the joint can be easily torn between the ventral portion 3 and the dorsal portion 2.

[0108] In a preferred embodiment of this product, the disposable diaper 1 further comprises at least one of a pair of leak-proof walls 6 and a pair of leg gathers 5, wherein the moisturizing agent SC is further applied to at least one of the pair of leak-proof walls 6 and the pair of leg gathers 5. In this case, the moisturizing agent SC may be applied to the pair of leak-proof walls 6 and the pair of leg gathers 5 that overlap with the dorsal portion 2 and the ventral portion 3, or it may be applied to part or all of the area of ​​the pair of leak-proof walls 6 and the pair of leg gathers 5 in the absorbent body 4 that does not overlap with the dorsal portion 2 and the ventral portion 3.

[0109] In this disposable diaper 1, the moisturizing agent SC is applied to the leak-proof wall 6 and leg gather section 5 located around the legs, where friction may occur due to the wearer's movements. Therefore, friction between the materials constituting the leak-proof wall 6 and leg gather section 5 and the skin can be reduced. As a result, friction can be reduced even around the legs near the waist, thus suppressing skin problems caused by friction.

[0110] In a preferred embodiment of this design, at least one of the ventral portion 3 and the dorsal portion 2 includes a moisturizing sheet member (moisturizing sheet) having a region where a moisturizing agent SC is present, and a colored sheet member (colored sheet) having a colored region. At least a portion of the region where the moisturizing agent SC is present and the colored region overlap in the thickness direction T.

[0111] The relationship between the area where the moisturizing sheet member exists and the colored area of ​​the colored sheet member is such that, when viewed in the thickness direction T, a part of one area overlaps with a part of the other area, one area may include the other area, or the two may completely overlap. When the moisturizing sheet member and the colored sheet member are separate, the colored sheet member is provided on the other side of the moisturizing sheet member, that is, on the side where the moisturizing agent SC is not applied.

[0112] Furthermore, the colored sheet member and the moisturizing sheet member may be the same. That is, a sheet member having a region containing the moisturizing agent SC on one side may have a colored region on one or the other side. In this case, both the region containing the moisturizing agent SC and the colored region may exist on one side, or the region containing the moisturizing agent SC may exist on one side and the colored region on the other side. In either case, at least a portion of the region containing the moisturizing agent SC will overlap with the colored region in the thickness direction.

[0113] When the colored sheet member is separate from the moisturizing sheet member, the colored sheet member may be, for example, a nonwoven fabric, and the coloring method may be, for example, a known printing method on a predetermined sheet member. The colored sheet member may be the same size and shape as the moisturizing sheet member, or it may not be. Furthermore, there are no particular restrictions on the color of the colored sheet member as long as it is colored. The color of the colored sheet may be accompanied by patterns or figures; that is, it may be a colored pattern. There are no particular restrictions on the pattern, and examples include polygons, circles, ellipses, stars, hearts, animals and plants, marble patterns, and combinations thereof.

[0114] In the example shown in Figure 4, when the moisturizing sheet members coated with the moisturizing agent SC are, for example, the inner sheet member 31 of the ventral portion 3 and the inner sheet member 21 of the dorsal portion 2, there are areas 3EA and 2EA where the moisturizing agent SC is present on the skin-facing surfaces of the inner sheet member 31 and the inner sheet member 21. Furthermore, colored areas (not shown) may be provided on the skin-facing or non-skin-facing surfaces of the inner sheet member 31 and the inner sheet member 21, respectively. Alternatively, a ventral colored sheet member (not shown) and a dorsal colored sheet member (not shown) having colored areas may be provided on the non-skin-facing surfaces of the inner sheet member 31 and the inner sheet member 21, overlapping in the thickness direction T. The areas 3EA and 2EA where the moisturizing agent SC is present in the inner sheet member 31 and the inner sheet member 21 overlap with the colored areas (not shown) in the thickness direction T.

[0115] Alternatively, if the moisturizing sheet members coated with the moisturizing agent SC are, for example, a ventral cover sheet member 43 and a dorsal cover sheet member 42, then a colored area (not shown) may be provided on the skin-facing or non-skin-facing surface of the ventral cover sheet member 43 and the dorsal cover sheet member 42, respectively. Alternatively, a ventral colored sheet member (not shown) and a dorsal colored sheet member (not shown) having a colored area may be provided on the non-skin-facing surface of the ventral cover sheet member 43 and the dorsal cover sheet member 42, respectively. In this case, the ventral colored sheet member and the dorsal colored sheet member may be an inner sheet member 31 and an inner sheet member 21, respectively. The areas where the moisturizing agent SC is present (not shown) in the ventral cover sheet member 43 and the dorsal cover sheet member 42 overlap with the colored area (not shown) in the thickness direction T.

[0116] Thus, in this disposable diaper 1, when the moisturizing sheet members are, for example, inner sheet member 31 and inner sheet member 21, the areas 3EA and 2EA where the moisturizing agent SC is present in them, and when the colored sheet members are, for example, ventral colored sheet member 45 (not shown) and dorsal colored sheet member (not shown), at least a portion of their colored areas overlap in the thickness direction T. Therefore, the parts of the disposable diaper 1 where the moisturizing agent SC is present can be visually identified. This allows the diaper to be fitted so that the areas 3EA and 2EA where the moisturizing agent SC is present are in contact with the appropriate position on the skin. Furthermore, the disposable diaper 1 can be fitted with as little contact as possible with the areas 3EA and 2EA where the moisturizing agent SC is present, thereby suppressing the removal of the moisturizing agent SC from the disposable diaper 1. Therefore, the effect of the moisturizing agent SC in reducing friction and the effect of transferring to the skin and protecting the skin can be reliably exerted.

[0117] In particular, when the colored sheet member and the moisturizing sheet member are the same, for example, they may both be the inner sheet member 31 and / or the inner sheet member 21, or they may both be the ventral cover sheet member 43 and / or the dorsal cover sheet member 42. In that case, the colored area is located on one side of the moisturizing sheet, i.e., the side on which the area exists, or the other side on the opposite side, so inevitably, at least a part of the area exists will overlap with the colored area in the thickness direction. This makes it possible to more reliably determine the position of the area exists based on the position of the colored area. Therefore, the absorbent article can be attached with as little contact with the moisturizer as possible so that the area exists in the appropriate position on the skin. Thus, the friction-reducing effect and skin-protecting effect of the moisturizer can be reliably exerted.

[0118] In a preferred embodiment of this design, the ventral portion 3 and the dorsal portion 2 each include inner sheet members (inner sheets) 31 and 21 located on the skin side, with the skin-facing surface constituting the skin-contact surface, and outer sheet members (outer sheets) 32 and 22 located on the non-skin side of the inner sheet members 31 and 21. The inner sheet members 31 and 21 have skin-contact surfaces 3S and 2S containing hydrophobic fibers. The moisturizing agent SC is a hydrophilic agent. The inner sheet members 31 and 21 may be hydrophobic sheets in which the entirety contains hydrophobic fibers, and the proportion of hydrophobic fibers in the constituent fibers is 70% by mass or more, as described above. Examples of the hydrophilic agent of the moisturizing agent SC include agents containing the hygroscopic water-retaining agent described above.

[0119] In this disposable diaper 1, as described above, a hydrophilic moisturizer SC is applied to the surface of the inner sheet members 31 and 21, which contain hydrophobic fibers, making it difficult for the moisturizer SC to penetrate the inner sheet members 31 and 21. As a result, the effects of the moisturizer SC applied to the inner sheet members 31 and 21, such as the effect of reducing friction and the effect of transferring to the skin to protect the skin, can be more effectively exerted, and the effects of the moisturizer SC can be produced even with a small amount.

[0120] The degree of hydrophilicity of the sheet material (sheet) 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.

[0121] In a preferred embodiment of this design, the inner sheet members (inner sheets) 31, 21 and the outer sheet members 32, 22 (outer sheets) are joined together with a hydrophobic adhesive (for example, a hot melt adhesive). The hydrophobic adhesive suppresses the penetration of the hydrophilic humectant SC from the inner sheet members 31, 21 to the outer sheet members 32, 22. This allows the humectant SC applied to the inner sheet members 31, 21 to exert its effect more reliably, and even a small amount can produce the humectant's effect.

[0122] In a preferred embodiment of this design, the hydrophobic adhesive is scattered within the inner sheet members (inner sheets) 31, 21 and the outer sheet members 32, 22 (outer sheets). This creates joints with the hydrophobic adhesive and non-joints in the inner sheet members 31, 21 and the outer sheet members 32, 22. In the joints, the hydrophobic adhesive suppresses the penetration of the hydrophilic humectant SC from the inner sheet members 31, 21 to the outer sheet members 32, 22. In the non-joints, there is a distance, i.e., thickness, between the inner sheet members 31, 21 and the outer sheets, making it difficult for the humectant to penetrate deep into the SC-coated inner sheet members 31, 21, and therefore into the outer sheet members 32, 22. This allows the humectant SC applied to the inner sheet members 31, 21 to exert its effect more reliably, and even a small amount of humectant SC can produce its effect.

[0123] In a preferred embodiment of this design, each of the ventral portion 3 and the dorsal portion 2 is provided with a plurality of elastic members extending along the width direction W and spaced apart in the longitudinal direction L. In at least one of the ventral portion 3 and the dorsal portion 2, the humectant SC is uniformly distributed when the plurality of elastic members are extended. The amount of humectant SC per unit area viewed from the thickness direction T is greater in the region where the plurality of elastic members are most contracted in their natural state than in other regions. In the example of Figure 4, the plurality of elastic members include a plurality of girth elastic members 13 in the ventral portion 3 and a plurality of girth elastic members 12 in the dorsal portion 2.

[0124] In this disposable diaper 1 (absorbent material), when worn, the region where the multiple elastic members (waist elastic members 13, 12) contract most when in their natural state is considered to be the region with the highest tightening force. For example, if the ventral portion 3 and the dorsal portion 2 are divided into n equal parts (for example, 3 equal parts) in the longitudinal direction L, and n regions extending in the width direction W are considered, then the region with the smallest waist diameter in its natural state is one of those n regions.

[0125] In this disposable diaper 1, when multiple elastic members are in an extended state, the moisturizing agent SC is uniformly applied to at least one of the sheet members (e.g., inner sheet members 31, 21) of the ventral portion 3 and the dorsal portion 2. When the multiple elastic members are in a contracted state, numerous wrinkles (multiple folds) are formed in the sheet member, increasing the apparent surface area of ​​the sheet member per unit area as viewed from the thickness direction T, and thus increasing the apparent amount of application per unit area. As a result, when the multiple elastic members are in a contracted state, the amount of moisturizing agent SC per unit area as viewed from the thickness direction T can be increased. Consequently, in the region where the multiple elastic members are most contracted when in their natural state, the amount of moisturizing agent SC per unit area as viewed from the thickness direction T can be increased compared to other regions.

[0126] In this way, by relatively increasing the amount of moisturizer SC in areas with high tightening force, the effects of moisturizer SC can be more reliably achieved. Specifically, it attracts moisture to the area around 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. Furthermore, since moisturizer SC is uniformly applied when multiple elastic members are stretched, even when multiple elastic members return to their natural state and random wrinkles occur, a certain amount or more of moisturizer can be secured.

[0127] In a preferred embodiment of this product, a portion of the moisturizer SC is applied to the area of ​​the ventral portion 3 and the dorsal portion 2 that overlaps with the wearer's iliac crest. In the example shown in Figure 4, a portion of the moisturizer SC is applied to the area TA of the ventral portion 3 that overlaps with the iliac crest. Here, friction between the disposable diaper 1 and the skin is likely to occur around the iliac crest. Therefore, in this disposable diaper 1, a portion of the moisturizer SC is applied to the area TA of the ventral portion 3 and the dorsal portion 2 that overlaps with the iliac crest. By placing the moisturizer SC in the area where friction is likely to occur in this way, skin friction can be suppressed more effectively.

[0128] In a preferred embodiment of this design, the humectant SC is not applied to the outer end in the longitudinal direction L of at least one of the ventral portion 3 and the dorsal portion 2.

[0129] 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 first embodiment of Figure 1. In the example of Figure 5, compared to the example of Figure 4, the moisturizer is not applied to the outer edges in the longitudinal direction L of both the ventral portion 3 and the dorsal portion 2. That is, there are uncoated areas 3WS and 2WS at the outer edges in the longitudinal direction L of 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.

[0130] Furthermore, when clothing comes into contact with the moisturizer SC, the fibers of the clothing can be adsorbed by the moisturizer SC, and if these adsorbed fibers accumulate, they may have adverse effects on the skin. Also, the adsorbed fibers may look like dirt, and consequently, the disposable diaper 1 may appear unsanitary. Therefore, in this disposable diaper 1, the moisturizer SC is not applied to the outer edge in the longitudinal direction L of at least one of the ventral portion 3 and the dorsal portion 2. Thus, it is possible to prevent clothing fibers from adsorbing to the outer edge in the longitudinal direction L of the ventral portion 3 and the dorsal portion 2, which are prone to contact with the wearer's clothing. This suppresses adverse effects on the skin caused by adsorbed fibers and prevents the disposable diaper 1 from appearing unsanitary.

[0131] In a preferred embodiment of this design, the humectant SC is not applied to the inner end in the longitudinal direction L of at least one of the ventral portion 3 and the dorsal portion 2.

[0132] In the example in Figure 5, compared to the example in Figure 4, the coating is not applied to the outer edges in the longitudinal direction L of both the ventral portion 3 and the dorsal portion 2. That is, there are uncoated areas 3LS and 2LS at the inner edges in the longitudinal direction L of 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.

[0133] Furthermore, when clothing or the floor surface comes into contact with the moisturizing agent SC, the fibers of the clothing and dust from the floor surface can be adsorbed by the moisturizing agent SC, and the accumulation of adsorbed fibers and dust may have adverse effects on the skin. In addition, the adsorbed fibers and dust may look like dirt, and consequently, the disposable diaper 1 may become unsanitary. Therefore, in this disposable diaper 1, the moisturizing agent SC is not applied to the inner edge in the longitudinal direction L of at least one of the ventral portion 3 and the dorsal portion 2. Thus, it is possible to prevent the fibers of clothing and dust from the floor surface from adsorbing to the inner edge in the longitudinal direction L of the ventral portion 3 and the dorsal portion 2, which are prone to contact with the wearer's clothing and the floor surface. This suppresses adverse effects on the skin from adsorbed fibers and dust, and prevents the disposable diaper 1 from looking unsanitary.

[0134] In a preferred embodiment of this design, the humectant SC is further applied to the central part of the longitudinal direction L of the joint surfaces of the ventral part 3 and the dorsal part 2 of the side seal portion, but not to both ends of the longitudinal direction L. In the example shown in Figure 5, the humectant SC is also applied to the ventral joint portion 3a and the dorsal joint portion 2a that constitute the side seal portion, but it is applied to the central part of the longitudinal direction L and not to both ends of the longitudinal direction L (uncoated areas 3WS and 2WS and uncoated areas 3LS and 2LS). The ventral joint portion 3a and the dorsal joint portion 2a are then overlapped in the thickness direction T and joined by heat sealing or sonic sealing to form the side seal portion.

[0135] Thus, the bonding strength of the joint surface formed by heat sealing or sonic sealing can be made lower in the central part of the longitudinal direction L due to the presence of the moisturizer SC, while being higher at both ends due to the absence of the moisturizer SC. As a result, when the disposable diaper 1 is attached, the bonding strength at both ends is high, so the bond between the ventral part 3 and the dorsal part 2 can be maintained, and when the disposable diaper 1 is removed, once both ends are torn, the bonding strength in the central part is low, so it can be torn smoothly.

[0136] 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 first 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 6, the moisturizer SC may be applied to only one of the ventral portion 3 and the dorsal portion 2.

[0137] Figure 7 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 first 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 7, the moisturizer SC may be applied to only one of the ventral portion 3 and the dorsal portion 2.

[0138] In this embodiment, a preferred configuration is one in which the friction coefficient MIU value of the area where the moisturizer SC is placed is 0.50 to 1.10. By keeping the MIU value from being too high (1.10 or less), friction is not strong, and skin irritation can be suppressed. Furthermore, by keeping the MIU value from being too low (0.50 or more), the minimum necessary amount of moisturizer SC is present, thus preventing the surface of the component containing the moisturizer SC from directly contacting the skin, and thereby preventing skin damage due to friction.

[0139] The friction coefficient MIU value in the area of ​​the sheet material where the moisturizing agent SC is placed can be measured by the following method. <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.

[0140] (Second Embodiment) Next, a second embodiment will be described. The disposable diaper 51 of this embodiment is of the tape type. Figures 8 and 9 show the disposable diaper 51 according to this embodiment. Figure 8 is a plan view showing an unfolded state of an example of the configuration of the disposable diaper 51. Figure 9 is a cross-sectional view along the widthwise center line CW in Figure 8. In this embodiment, the main differences from the first embodiment will be described.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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 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 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 are made of the same material as the inner sheet members 31 and 21, for example.

[0153] Next, the application of the moisturizer in this embodiment will be described. The disposable diaper 1 (absorbent article) is equipped with a moisturizer applied to the outside of the width direction W at at least one of the skin-contact surface 53S (skin-facing surface) of the ventral portion 53 and the skin-contact surface 52S (skin-facing surface) of the dorsal portion 52. Preferably, the moisturizer is applied to the outside of the width direction W at each of the width directions W at at least one of the skin-contact surface 53S (skin-facing surface) of the ventral portion 53 and the skin-contact surface 52S (skin-facing surface) of the dorsal portion 52.

[0154] Figure 10 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 8. In this embodiment, the moisturizer SC is applied (placed) to the outside in the width direction W at each end of the width direction W of the absorbent body 54 on at least both skin-contacting surfaces 53S, 52S (skin-facing surfaces) of the ventral portion 53 and the dorsal portion 52, i.e., the side sheet member 70. In detail, the moisturizer SC is applied (placed) to the skin-contacting surfaces 53S, 50S, and 52S of the ventral portion 53, the central portion 50, and the dorsal portion 52, i.e., the skin-contacting surfaces (including the leak-proof wall 56) of the side sheet member 70. In this embodiment, the moisturizer SC is also applied to the skin-contacting surface of the absorbent body 54 (the surface sheet 57 of the absorbent body 54). The areas in the ventral portion 53, the central portion 50, and the dorsal portion 52 where the moisturizing agent SC is applied / placed can be called the areas 53EA, 50EA, and 52EA where the moisturizing agent SC is present.

[0155] In the example shown in Figure 10, the sheet members coated with the moisturizing agent SC may, for example, be a pair of side sheet members 70, and a colored area (not shown) may be provided on the skin-facing or non-skin-facing surface of the pair of side sheet members 70. Alternatively, a ventral colored sheet member (not shown) and a dorsal colored sheet member (not shown) having a colored area may be provided on the non-skin-facing surface of the pair of side sheet members 70. The existing areas 53EA and 52EA of the pair of side sheet members 70 each overlap with the colored area (not shown) in the thickness direction T.

[0156] Figure 11 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 8. 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).

[0157] In this second embodiment, the same effects as in the first embodiment can be obtained.

[0158] 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.

[0159] 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.

[0160] 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]

[0161] The present invention will be described below based on examples, but the present invention is not limited to these examples.

[0162] (1) Sample Example: As a disposable diaper, a size L pant-type disposable diaper of the first embodiment was prepared. For this disposable diaper, a moisturizer was added at the position shown in Figure 4, at a basis weight of 1.0 g / m². 2 The diapers were applied using the provided solution. Disposable diapers used in the example were prepared 1.0 month after application. As a humectant, a solution containing 70% by mass of glycerin and 30% by mass of water was used under conditions of 20°C and 60% RH relative humidity. Comparative Example: The same disposable diapers as in Examples 1-3 were prepared. However, no moisturizer was applied to these disposable diapers. The disposable diapers without moisturizer were designated as the comparative example.

[0163] (2) Evaluation Three subjects (infants (approximately 2 years old) with average body types based on the design of the pull-up type disposable diapers (size L)) were each fitted with either the example or comparative example disposable diaper for a predetermined time (e.g., 72 hours). Changes in stratum corneum moisture content were measured on the abdominal skin before and after fitting. However, the change in stratum corneum moisture content was measured using a stratum corneum moisture meter (Corneometer CM825, model number CM825MP, manufactured by Courage + Khazaka electronics).

[0164] (3) Results The evaluation results are shown in Table 1 below. In Examples 1-3, the shifting of absorbent materials was suppressed by wearing disposable diapers coated with a moisturizer. Furthermore, it was found that wearing these disposable diapers increased the stratum corneum moisture content of the wearer's skin. In other words, it was found that the skin moisture content increased and the skin became more hydrated in all wearers. In comparative examples 1-3, the shifting of absorbent materials was suppressed by wearing disposable diapers without moisturizer application. However, it was found that wearing these disposable diapers resulted in little to no change in the stratum corneum moisture content of the wearer's skin, or only a slight increase. In other words, it was found that the skin's moisture content remained unchanged, resulting in no change in skin hydration, or even if the skin's moisture content increased, the increase in skin hydration was minimal.

[0165] [Table 1]

[0166] 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, etc., as appropriate, without departing from the purpose and spirit of the present invention. [Explanation of Symbols]

[0167] 1. 51 disposable diapers 2 Dorsal part 3 Ventral part 4 Absorbent body 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, On at least one of the skin-contacting surfaces of the ventral and dorsal portions, a moisturizer is applied to the outer surface in the width direction of at least one of the ends of the absorbent body in the width direction. Absorbent material.

2. The moisturizer is applied to the outer side in the width direction of each of the widthwise ends of the absorbent body on at least one of the skin-contacting surfaces of the ventral and dorsal portions. The absorbent article according to claim 1.

3. The humectant is applied continuously or intermittently from one end to the other in the width direction of at least one of the ventral and dorsal portions. The absorbent article according to claim 1 or 2.

4. The humectant is applied to the ends of the absorbent in the longitudinal and / or width directions so as to overlap in the thickness direction. The absorbent article according to claim 1 or 2.

5. The aforementioned moisturizer is not applied to the outer end in the longitudinal direction of at least one of the ventral and dorsal portions. The absorbent article according to claim 1 or 2.

6. The aforementioned moisturizer is not applied to the inner end in the longitudinal direction of at least one of the ventral and dorsal portions. The absorbent article according to claim 1 or 2.

7. It further comprises at least one of a pair of leak-proof walls and a pair of leg gather sections, The moisturizing agent is further applied to at least one of the pair of leak-proof walls and the pair of leg gathers. The absorbent article according to claim 1 or 2.

8. The absorbent article is a disposable diaper in the form of pants. The aforementioned moisturizer is further applied to the skin-contacting surface at the widthwise end of the side seal portion that joins the ventral portion and the dorsal portion. The absorbent article according to claim 1 or 2.

9. The aforementioned moisturizing agent is further applied to the respective joining surfaces of the ventral and dorsal portions of the side seal portion. The absorbent article according to claim 8.

10. The humectant is further applied to the central part in the longitudinal direction of the joint surface of the ventral and dorsal parts of the side seal portion, but not to both ends in the longitudinal direction. The absorbent article according to claim 8.

11. At least one of the ventral portion and the dorsal portion is A moisturizing sheet having a region where the aforementioned moisturizing agent is present, A colored sheet having a colored area, Includes, The aforementioned region and at least a portion of the colored region overlap in the thickness direction. The absorbent article according to claim 1 or 2.

12. The aforementioned colored sheet is the aforementioned moisturizing sheet, The colored region is located on one or the other surface of the moisturizing sheet. At least a portion of the aforementioned region overlaps with the colored region. The absorbent article according to claim 11.

13. The ventral portion and the dorsal portion, respectively, An inner sheet located on the skin side, the skin-facing surface of which constitutes the skin contact surface, The outer sheet located on the non-skin side of the inner sheet, Includes, The inner sheet has a skin-contacting surface which contains hydrophobic fibers. The aforementioned humectant is a hydrophilic agent. The absorbent article according to claim 1 or 2.

14. The inner sheet and the outer sheet are joined together with a hydrophobic adhesive. The absorbent article according to claim 13.

15. The hydrophobic adhesive is scattered within the inner sheet and the outer sheet. The absorbent article according to claim 14.

16. 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.

17. The aforementioned hygroscopic humectant contains glycerin. The absorbent article according to claim 16.

18. The aforementioned humectant further comprises a preservative aid. The absorbent article according to claim 16.

19. Each of the ventral and dorsal portions comprises a plurality of elastic members extending along the width direction and arranged at intervals in the longitudinal direction. In at least one of the ventral portion and the dorsal portion, The humectant is uniformly distributed when the plurality of elastic members are in an extended state. The amount of the humectant per unit area as viewed from the thickness direction is such that the region in which the plurality of elastic members contract the most in their natural state is greater than the other regions. The absorbent article according to claim 1 or 2.

20. A portion of the aforementioned moisturizer is applied to the area of ​​the ventral and dorsal portions that overlaps with the wearer's iliac crest. The absorbent article according to claim 1 or 2.

21. 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.

22. The absorbent article is a tape-type disposable diaper. In the width direction, the following is further provided: The moisturizer is applied to the skin-facing surface of each of the pair of side flaps, in the area that overlaps when each of the pair of side flaps is folded. The absorbent article according to claim 1 or 2.

23. The friction coefficient MIU value of the region where the humectant is placed is 0.50 to 1.

10. The absorbent article according to claim 1 or 2.

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