Shorts-type absorbent article

Abstract

A short pants-type absorbent article is provided. In a short pants-type absorbent article having a hydrophilic sheet containing a hydrophilic oil agent, peeling of a lower end portion of a side joint is inhibited. A short pants-type absorbent article (1) has an absorbent main body (10) and a waist member (20) which joins a front waist portion (30) and a back waist portion (40) in a ring shape with a pair of side joints (50), the waist member (20) has a hydrophobic sheet portion (31, 41) and a hydrophilic sheet portion (32, 42) containing a hydrophilic oil agent, at a lower end portion of the side joint (50), a skin-facing surface of the front waist portion (30) and a skin-facing surface of the back waist portion (40) are joined in a state of facing each other, and the hydrophobic sheet portion (31, 41) is provided in at least one of the skin-facing surface of the front waist portion (30) and the skin-facing surface of the back waist portion (40).

Description

Technical Field

[0001] This invention relates to a shorts-type absorbent article. Background Technology

[0002] Previously, it was known to use shorts-type diapers that used hydrophilic nonwoven fabrics whose hydrophilicity was increased by containing hydrophilic oil agents. For example, in Patent Document 1, as an outer sheet 4 constituting the outer body 3 of diaper 1, a technology involving the use of a disposable diaper with a hydrophilic nonwoven fabric having fibers that have been hydrophilized by means of treating hydrophobic synthetic fibers with a hydrophilic agent was disclosed.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-113186 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] In diapers using such hydrophilic sheet components, moisture such as sweat can be easily absorbed from the wearer's skin during wear. However, when the diaper is formed into a shorts shape during the manufacturing process, the side joints where the front (front waistband) and back (back waistband) sections are joined can sometimes have reduced bond strength due to the influence of the hydrophilic oil. For example, when the side joints are formed using joining methods such as heat welding or ultrasonic welding, if a hydrophilic oil film is sandwiched between the opposing surfaces of the front and back waistbands, sufficient bond strength may not be achieved. In such cases, when the wearer puts on or takes off the diaper, the side joints may easily peel off due to the load applied to the lower end, potentially causing the shorts shape to be compromised.

[0008] The present invention was made in view of the existing problems as described above, and its object is to suppress the lower end peeling of the lateral joint in a shorts-type absorbent article having a hydrophilic sheet containing a hydrophilic oil agent.

[0009] Solution for solving the problem

[0010] The main technical solution for achieving the above-mentioned objective is a shorts-type absorbent article having intersecting vertical, horizontal, and front-back directions. This shorts-type absorbent article has a waistband and a liquid-absorbing body. The waistband is formed by a pair of lateral joints on both sides in the horizontal direction, which annularly join the front and rear waist sections. The waistband is characterized by having a hydrophilic sheet containing a hydrophilic oil and a hydrophobic sheet containing less of the hydrophilic oil per unit volume than the hydrophilic sheet. At the lower end of the lateral joints, the skin-contact surfaces of the front and rear waist sections are joined facing each other. At least one of the skin-contact surfaces of the front and rear waist sections is provided with the hydrophobic sheet.

[0011] Other features of the invention will become apparent from the description and drawings herein.

[0012] The effects of the invention

[0013] According to the present invention, in a shorts-type absorbent article having a hydrophilic sheet containing a hydrophilic oil, it is possible to suppress peeling of the lower end of the lateral joint. Attached Figure Description

[0014] Figure 1 This is a rough 3D diagram of Diaper 1.

[0015] Figure 2 This is a top view of diaper 1 in its unfolded and extended state.

[0016] Figure 3 yes Figure 2 A rough cross-sectional view at line AA.

[0017] Figure 4A This is a top view of the absorbent body 10. Figure 4B This is a schematic cross-sectional view of the absorbent body 10.

[0018] Figures 5A-5C This diagram illustrates the basic principle of absorbing and evaporating moisture in diaper 1.

[0019] Figure 6 This is a cross-sectional schematic diagram of the side joint 50 where the front waist section 30 and the rear waist section 40 are joined, viewed along the vertical direction.

[0020] Figure 7 This is a cross-sectional schematic diagram showing the cross-sectional shape of the front waist section 30 in the thickness direction.

[0021] Figure 8This is a cross-sectional schematic diagram showing the relationship between the position of the compression part 31e of the front waist part 30 and the position of the compression part 41e of the rear waist part 40 in the side joint 50.

[0022] Figure 9A and Figure 9B This figure illustrates the method of installing the waist elastic member 35 onto the front waist part 30 using the welded part 60.

[0023] Figure 10A This is a top view of diaper 2 in its unfolded and extended state. Figure 10B yes Figure 10A A rough cross-sectional view at the BB line.

[0024] Figure 11A This is a top view of diaper 3 in its unfolded and extended state. Figure 11B yes Figure 11A A rough cross-sectional view at the CC line.

[0025] Explanation of reference numerals in the attached figures

[0026] 1. Diaper (shorts-type absorbent article) (First embodiment); 2. Diaper (shorts-type absorbent article) (Second embodiment); 3. Diaper (shorts-type absorbent article) (Third embodiment); 10. Absorbent body; 11. Absorbent core; 11b. Core packing sheet; 11c. Narrowing section; 12. Top sheet; 13. Bottom sheet; 13a. Liquid-proof sheet; 13b. Outer sheet; 15. Leak-proof wall section; 16. Leak-proof wall elastic member; 17. Leg opening elastic member; 20. Waist section member; 21. Skin side sheet (hydrophobic nonwoven fabric); 22. Non-skin side sheet (hydrophilic nonwoven fabric); 30. Front waist section; 30sw. Side section; 31. Skin side sheet (hydrophobic nonwoven fabric); 31e. Compression section; 32, Non-skin side panel (hydrophilic nonwoven fabric); 32f, Fold-back section; 32h, Opening section; 35, Waist elastic member; 36, Skin face panel; 36b, Lower end; 40, Rear waist section; 40b, Hip cover; 40sw, Side section; 41, Skin side panel (hydrophobic nonwoven fabric); 41e, Compression section; 42, Non-skin side panel (hydrophilic nonwoven fabric); 42f, Fold-back section; 42h, Opening section; 45, Waist elastic member; 46, Skin face panel; 46b, Lower end; 47, Bending elastic member; 50, Side joint; 60, Welded section; 60s, Welded section pair; BH, Waist opening; LH, Leg opening; CL, Central position (longitudinal direction, length direction). Detailed Implementation

[0027] Based on the description in this specification and the accompanying drawings, at least the following become clear.

[0028] A shorts-type absorbent article having intersecting vertical, horizontal, and front-back directions, comprising a waistband and a liquid-absorbing body. The waistband is formed by a pair of lateral joints on both sides in the horizontal direction, which annularly join a front waist portion and a rear waist portion. The waistband is characterized by having a hydrophilic sheet portion containing a hydrophilic oil and a hydrophobic sheet portion containing less of the hydrophilic oil per unit volume than the hydrophilic sheet portion. At the lower end of the lateral joints, the skin-contact surfaces of the front and rear waist portions are joined facing each other. At least one of the skin-contact surfaces of the front and rear waist portions is provided with the hydrophobic sheet portion.

[0029] According to this type of shorts-shaped absorbent article, since at least one of the sheet members facing each other in the thickness direction at the lower end of the side joint has a hydrophobic sheet portion with a lower content of hydrophilic oil, the influence of the hydrophilic oil at the side joint is smaller compared to the case where both sheet members facing each other in the thickness direction have hydrophilic sheets. That is, the bonding strength at the lower end of the side joint is less likely to decrease. As a result, peeling of the lower end of the side joint can be suppressed during the wearing of the absorbent article, thereby easily maintaining the shorts-shaped shape.

[0030] For this shorts-type absorbent article, it is preferable that the hydrophobic sheet is provided at the lower end of the side joint, on either the skin-closest side of the front waist section or the skin-closest side of the rear waist section.

[0031] In this type of shorts-shaped absorbent article, at the lower end of the side joint, the sheet members facing each other along the thickness direction are all hydrophobic sheets, thus reducing the influence of hydrophilic oils contained in the hydrophilic sheets. Therefore, it is easier to suppress the reduction of the bonding strength of the side joint.

[0032] For this type of absorbent shorts, it is preferable that the hydrophilic sheet is provided on either the non-skin side of the front waist section or the non-skin side of the rear waist section.

[0033] According to this type of shorts-shaped absorbent garment, moisture absorbed from the wearer's skin by the hydrophobic portion located on the skin side can be transferred to the hydrophilic portion located on the non-skin side, thereby facilitating the release of absorbed moisture from the non-skin side surface of the hydrophilic portion into the atmosphere. As a result, moisture is less likely to come into contact with the wearer's skin, thus inhibiting the occurrence of skin problems or causing discomfort to the wearer.

[0034] For this type of absorbent shorts, it is preferable that the hydrophobic sheet portion has a plurality of compression portions that compress the hydrophobic sheet portion from the non-skin side to the skin side.

[0035] According to this type of shorts-shaped absorbent article, since the bottom of the compression portion is positioned at a predetermined distance from the hydrophilic sheet portion on the non-skin side in the thickness direction, the portion of the hydrophobic sheet portion where the compression portion is located is less susceptible to the influence of the hydrophilic oil contained in the hydrophilic sheet portion. Therefore, it is easy to suppress the reduction of the bonding strength of the lateral joints.

[0036] Preferably, the shorts-type absorbent article has portions where the positions of the compression portions located on the front waist section and the compression portions located on the rear waist section do not overlap when the side joints are viewed from the thickness direction.

[0037] In this type of shorts-shaped absorbent garment, because the bottoms of the high-stiffness compression parts are positioned offset from each other, excessive stiffness at the side joints can be prevented, thus minimizing skin discomfort when wearing the absorbent garment. Furthermore, it prevents poor welding that could occur when forming the side joints due to the bottoms of the high-stiffness compression parts overlapping, thereby preventing the side joints from peeling off.

[0038] For this shorts-type absorbent article, it is preferable that two or more layers of the hydrophobic sheet are provided on both sides of the waist member at the position closest to the skin between the central position and the lower end position in the vertical direction.

[0039] According to such shorts-type absorbent articles, by providing two or more layers of hydrophobic sheets on the skin side of the waist component, the influence of the hydrophilic oil contained in the hydrophilic sheet disposed on the non-skin side at the lower end of the side joint becomes smaller, thereby making it easier to suppress the reduction of the joint strength.

[0040] For this shorts-type absorbent article, it is preferable that a hydrophobic skin sheet is provided on the skin-closest side of the waist member, and the lower end of the skin sheet is located between the central position and the lower end position in the vertical direction on both sides of the waist member.

[0041] According to this type of shorts-shaped absorbent garment, even if peeling occurs at the lower end of the side joint and the peeling propagates upwards in the vertical direction when the absorbent garment is worn, the propagation of the peeling can be stopped at the lower end of the skin panel. Therefore, overall peeling of the side joint can be suppressed, thereby easily maintaining the shorts-shaped shape of the absorbent garment.

[0042] For this type of absorbent shorts, it is preferable that the hydrophobic sheet is provided on the skin-closest side of the front waist and the rear waist in the entire region from the top to the bottom in the vertical direction of the side joint.

[0043] Based on this type of shorts-shaped absorbent material, it is easy to suppress the reduction of bonding strength in the entire area of ​​the side joint, and the shorts-shaped shape of the absorbent material can be easily and stably maintained.

[0044] For this shorts-type absorbent article, it is preferable that the amount of the hydrophilic oil per unit volume at the upper end of the side joint is greater than the amount of the hydrophilic oil per unit volume at the lower end of the side joint.

[0045] In this type of shorts-shaped absorbent garment, the adhesive strength is weaker because the upper part of the side seam contains more hydrophilic oil than the lower part. Therefore, when removing the absorbent garment from the wearer's body, it is easy to tear the side seam from the upper part. This allows the user to put on and take off the absorbent garment without any pressure.

[0046] For this type of absorbent shorts, it is preferable that the upper end of the side joint has two or more layers of the hydrophilic sheet portion.

[0047] Based on this type of shorts-shaped absorbent garment, the strength of the waistband member can be increased at the upper end of the side joint. Therefore, when removing the absorbent garment, even if the front and rear waistbands are pulled back and forth by grasping the upper end of the side joint, the sheet members constituting the front and rear waistbands are not easily damaged. Furthermore, the pulling force easily peels off the side joint. As a result, it is easier to peel the side joint from the upper end to the lower end.

[0048] ===First Implementation Method===

[0049] As an example of the shorts-type absorbent article of the present invention, a shorts-type disposable diaper (hereinafter also referred to as "diaper 1") will be described. However, the shorts-type absorbent article of the present invention also includes shorts-type sanitary napkins and other shorts-type absorbent articles.

[0050] <Structure of Diaper 1>

[0051] Figure 1 This is a rough 3D diagram of Diaper 1. Figure 2 This is a top view of diaper 1 in its unfolded and extended state. Figure 3 yes Figure 2A schematic cross-sectional view at line AA. Furthermore, the “stretched state” of diaper 1 refers to the state in which the diaper 1 as a whole (the product as a whole) is stretched to a wrinkle-free state. Specifically, it refers to the state in which the dimensions of each component constituting diaper 1 (such as the absorbent body 10, waist component 20, etc., described later) become the same as or close to the dimensions of the individual component.

[0052] exist Figure 1 In the shorts-style configuration shown, the diaper 1 has intersecting vertical, horizontal, and front-back directions, and includes a waist opening (BH) and a pair of leg openings (LH, LH). The upper side of the vertical opening (BH) corresponds to the waist opening (BH), and the lower side corresponds to the crotch area. Furthermore, the front side of the front opening (LH) corresponds to the wearer's abdomen, and the back side corresponds to the wearer's back. Additionally, in... Figure 2 In its unfolded state, diaper 1 has intersecting longitudinal and transverse directions. The longitudinal direction is along... Figure 1 The vertical direction corresponds to the length direction of the absorbent body 10. The horizontal direction is along... Figure 1 The left and right directions within. Additionally, such as... Figure 3 As shown, the direction in which the materials constituting diaper 1 are layered is defined as the thickness direction. The side in the thickness direction that comes into contact with the wearer's skin is defined as the skin side, and the opposite side is defined as the non-skin side.

[0053] The diaper 1 has an absorbent body 10 and a waist member 20 disposed on the non-skin side of the absorbent body 10. Furthermore, the waist member 20 has a front waist portion 30 corresponding to the front part of the diaper 1 and a rear waist portion 40 corresponding to the back part of the diaper 1. That is, the diaper 1 of the first embodiment is a so-called three-piece shorts-type diaper. As a first component, it has an absorbent body 10 that fits snugly against the wearer's crotch to absorb urine and other excrement; as a second component, it has a front waist portion 30 that covers the wearer's abdominal side; and as a third component, it has a rear waist portion 40 that covers the wearer's back side.

[0054] exist Figure 2In its unfolded state, with the front waist section 30 and the rear waist section 40 arranged parallel to each other at intervals along the longitudinal direction, the absorbent body 10 is positioned between them. Simultaneously, the ends 10ea and 10eb of the absorbent body 10 along its length (longitudinal direction) are respectively joined and fixed to the skin side of the waist section 30 and 40 nearby. The diaper 1 has an approximate H-shape when viewed from above. Furthermore, from this state, the absorbent body 10 is folded in half with its central position CL along its length as the folding position. In this folded state, the side portions 30sw and 40sw of the front waist section 30 and the rear waist section 40, which are opposite each other, are joined together in the left and right directions, forming a pair of lateral joints 50, 50. That is, the pair of lateral joints 50, 50 form a ring shape between the front waist section 30 and the rear waist section 40. This results in... Figure 1 The diaper 1 shown is in a shorts-like state, with a waist opening BH and a pair of leg openings LH, LH. Furthermore, the side joints 50 are formed by known joining methods such as welding and bonding.

[0055] (Absorbent Subject 10)

[0056] Figure 4A This is a top view of the absorbent body 10. Figure 4B This is a schematic cross-sectional view of the absorbent body 10. The absorbent body 10 has an absorbent core 11 for absorbing excrement, a top sheet 12 disposed on the skin side in the thickness direction of the absorbent core 11, and a bottom sheet 13 disposed on the non-skin side of the absorbent core 11. However, the absorbent body 10 may also have sheet members other than the sheet members described above. For example, the absorbent body 10 may also have a second sheet (not shown) between the top sheet 12 and the absorbent core 11 in the thickness direction.

[0057] The absorbent core 11 is a component that absorbs and retains excretory fluids such as urine, and is formed, for example, from liquid-absorbent fibers such as pulp fibers incorporating highly absorbent polymers (SAP). Furthermore, the outer peripheral surface of the absorbent core 11 can also be covered by a liquid-permeable sheet component (core sheet 11b) such as cotton paper or nonwoven fabric. In this embodiment, the absorbent core 11 has a narrowed portion 11c, which narrows in width in the left-right direction, between its front and rear ends in the longitudinal direction, and has the following characteristics: Figure 4A The shape, when viewed from above, is roughly hourglass-shaped. The narrowed portion 11c is the part that sits between the wearer's legs when the diaper 1 is worn; this portion is shorter in length (narrower in width) in the lateral direction, thereby allowing the absorbent core 11 to easily conform to the wearer's crotch. Furthermore, although in this embodiment it becomes as... Figure 4B The absorbent core 11 is in a state where two layers overlap in the thickness direction, but the shape of the absorbent core 11 is not limited to this.

[0058] The top sheet 12 is a liquid-permeable sheet material, such as a hydrophilic hot-air nonwoven fabric or spunbond nonwoven fabric. In this embodiment, for example... Figure 4B As shown, the two sides of the top sheet 12 in the left-right direction are folded back towards the non-skin side to roll in the absorbent core 11.

[0059] The film 13 has a two-layer structure formed by an impermeable sheet 13a and a hydrophobic outer sheet 13b disposed on the non-skin side of the impermeable sheet 13a. The impermeable sheet 13a may be, for example, a resin film, and the outer sheet 13b may be, for example, a soft nonwoven fabric.

[0060] A pair of leak-proof wall portions 15 are provided on both sides of the absorbent body 10 in the left-right direction along the longitudinal direction (the length direction of the absorbent body 10). In this embodiment, the leak-proof wall portions 15 are formed by the aforementioned outer sheet 13b. Specifically, in the left-right direction (lateral direction), a portion of the outer sheet 13b extends outward beyond both ends of the absorbent core 11, while... Figure 4B As shown, the diaper bends towards the skin at multiple points, thereby forming a pair of leak-proof wall portions 15. An elastic leak-proof member 16, such as a rubber band, is attached to the skin-side end (front end) of the leak-proof wall portion 15 in a state of elongation along the longitudinal direction (the length direction of the absorbent body 10). When the diaper 1 is worn, based on the elasticity exhibited by the leak-proof member 16, the leak-proof wall portion 15 rises towards the wearer's skin and conforms to the wearer's crotch area.

[0061] Furthermore, elastic leg bands or other leg band members 17 are installed on both sides of the absorbent body 10 in a longitudinal direction (the length direction of the absorbent body 10). When the diaper 1 is worn, the elastic leg band members 17 exhibit elasticity, causing the sides of the absorbent body 10 to contract and easily conform to the wearer's leg circumference.

[0062] (Front waist 30)

[0063] like Figure 3 As shown, the front waist portion 30 has a skin side sheet 31 positioned closest to the skin in the thickness direction, a non-skin side sheet 32 ​​stacked adjacent to the skin side sheet 31 on the non-skin side, and a waist elastic member 35 disposed between the skin side sheet 31 and the non-skin side sheet 32 ​​in the thickness direction. The front waist portion 30 is basically a two-layer structure with the skin side sheet 31 and the non-skin side sheet 32, but for example, the front waist portion 30 may also have a partial three-layer or more structure, such as the skin sheet 36 described later.

[0064] Skin side panel 31 and non-skin side panel 32 are as follows Figure 2The sheet material shown, when viewed from above, is rectangular in shape and is formed, for example, from SMS nonwoven fabric. Furthermore, in diaper 1, the sheet material (nonwoven fabric) constituting the non-skin side panel 32 has a higher hydrophilicity than the sheet material (nonwoven fabric) constituting the skin side panel 31. That is, the skin side panel 31 is made of a nonwoven fabric with lower hydrophilicity (hereinafter also referred to as "hydrophobic nonwoven fabric"), while the non-skin side panel 32 is made of a nonwoven fabric with higher hydrophilicity than the skin side panel 31 (hereinafter also referred to as "hydrophilic nonwoven fabric"). Details regarding the hydrophilicity of each panel 31 and 32, and the functions based on the difference in hydrophilicity, will be explained later.

[0065] In addition, multiple such features are provided on the surface of the non-skin side sheet 32. Figure 2 The enlarged view shows the opening 32h. The opening 32h is a through-hole extending along the thickness direction through the non-skin side panel 32. By providing this opening 32h, the breathability of the front waist section 30 can be improved. Furthermore, the opening 32h is visually recognizable on the non-skin side of the front waist section 30, making it easy for the user to recall that the front waist section 30 has good breathability. Each opening 32h can, for example, be a circle with a diameter of approximately 1 mm, but the shape and arrangement (number and pattern) of the opening 32h can be appropriately changed. In addition, in the diaper 1, no through-holes equivalent to the opening 32h are provided on the skin side panel 31.

[0066] In this embodiment, the front waist portion 30 has a folded-back portion 32f, which is formed by folding back the upper end (front end in the longitudinal direction) of the non-skin side piece 32 from the non-skin side to the skin side and from the front to the rear in the longitudinal direction. This folded-back portion 32f covers a portion (upper end) of the skin side piece 31, thereby preventing the upper edge of the skin side piece 31 from getting stuck into the wearer's skin. However, it is not necessarily required to provide the folded-back portion 32f.

[0067] Multiple elastic waist members 35 are arranged vertically between the skin side panel 31 and the non-skin side panel 32, and are installed in a state of extension in the left and right direction. Utilizing the elasticity of the elastic waist members 35, the front waist section 30 fits snugly against the wearer's abdominal waist.

[0068] The waist elastic member 35 can be installed using an adhesive such as a hot melt adhesive. For example, by applying a hot melt adhesive to the waist elastic member 35, causing it to elongate at a predetermined elongation ratio, and then holding it between the skin side piece 31 and the non-skin side piece 32, the waist elastic member 35 can be installed. That is, the skin side piece 31 and the non-skin side piece 32 are joined together via the waist elastic member 35 using an adhesive. Alternatively, the waist elastic member 35 can be installed either by applying adhesive to the skin side piece 31 and the non-skin side piece 32, or by using the welding method of the welding portion 60 described later.

[0069] Additionally, the front waist section 30 may also have a skin panel 36. For example... Figure 3 As shown, the skin sheet 36 is a sheet member configured to cover the upper end (front end in the longitudinal direction) of the absorbent body 10 from the skin side, serving as a cover sheet. This prevents the upper edge of the absorbent body 10 from getting stuck into the wearer's skin when wearing the diaper 1. Preferably, the skin sheet 36 is formed of, for example, SMS nonwoven fabric, and is a hydrophobic nonwoven fabric with lower hydrophilicity than the non-skin side sheet 32, similar to the skin side sheet 31. However, it is not necessarily required to provide a skin sheet 36.

[0070] In the front waist section 30 of this embodiment, when sheet members are provided at positions closer to the skin side than the skin side sheet 31 or closer to the non-skin side sheet 32, each sheet is configured to cover only a portion of the skin side sheet 31 and the non-skin side sheet 32. For example, Figure 3 The skin face piece 36 is configured to cover only a portion of the skin side of the skin side piece 31, so that at least a portion of the skin side piece 31 is exposed on the wearer's skin side.

[0071] (Rear waist 40)

[0072] The rear waist section 40 has a structure substantially the same as that of the front waist section 30. Specifically, the rear waist section 40 has a skin-side sheet 41 positioned closest to the skin in the thickness direction, a non-skin-side sheet 42 stacked adjacent to the skin-side sheet 41 on its non-skin-side, and a waist elastic member 45 disposed between the skin-side sheet 41 and the non-skin-side sheet 42 in the thickness direction. Furthermore, similar to the front waist section 30, the rear waist section 40 may also have an opening 42h, a folded-back portion 42f, a skin-side sheet 46, etc. (see reference). Figure 2 , Figure 3 Since the structure of each component is roughly the same as that of the components of the front waist section 30, the description is omitted.

[0073] On the other hand, the shape of the rear waist section 40 differs from that of the front waist section 30. Specifically, as... Figure 2 As shown, the rear waist portion 40 has a hip cover 40b that is approximately trapezoidal in shape in the vertical direction, located below the side joint portion 50 (side portion 40sw). In the hip cover 40b, the lateral width widens from the lower side to the upper side in the vertical direction. By providing the hip cover 40b, the rear waist portion 40 can cover the wearer's buttocks when the diaper 1 is worn. That is, the hip cover 40b functions as a hip cover.

[0074] Additionally, the buttock bra 40b is equipped with... Figure 2 The elastic member 47, such as a rubber band, is shown. The elastic member 47 is installed between the skin side panel 41 and the non-skin side panel 42 in a state of elongation along the outer edge of the buttock cover 40b. The elasticity of the elastic member 47 makes it easy for the buttock cover 40b of the back waist part 40 to fit the wearer's buttocks when wearing the diaper 1. In addition, the buttock cover 40b is not easy to roll up from the buttocks.

[0075] <Regarding the hydrophilicity of sheet components>

[0076] The hydrophilicity of the sheet material components will be explained here. In diaper 1, a hydrophobic nonwoven fabric is used as the skin side sheet 31, and a hydrophilic nonwoven fabric with higher hydrophilicity than the skin side sheet 31 is used as the non-skin side sheet 32. The hydrophilic nonwoven fabric in this embodiment is a nonwoven fabric whose hydrophilicity has been improved by treating the hydrophobic nonwoven fabric (hydrophilic treatment), which involves attaching a predetermined oil (hydrophilic oil). As the oil used in the hydrophilic treatment, commercially available oils that have the effect of acting as antistatic interference agents for fibers, such as anionic oils, nonionic oils, and mixtures thereof, can be used. These oils are added to an oil bath and oiled using an oiling roller or the like, thereby improving the hydrophilicity of the hydrophobic nonwoven fabric and obtaining a hydrophilic nonwoven fabric. However, hydrophilic nonwoven fabrics can also be formed by other methods. For example, a hydrophilic nonwoven fabric can also be obtained by manufacturing a nonwoven fabric using fibers with higher hydrophilicity. Furthermore, in this embodiment, the entire nonwoven fabric constituting the non-skin side sheet 32 ​​is subjected to a hydrophilic treatment to improve the overall hydrophilicity of the non-skin side sheet 32.

[0077] The hydrophilicity of the sheet component can be evaluated by measuring the contact angle when ion-exchanged water comes into contact with the surface of the sheet component. Specifically, if the contact angle between the hydrophilic nonwoven fabric and ion-exchanged water is smaller than that between the hydrophobic nonwoven fabric and ion-exchanged water, then the hydrophilic nonwoven fabric has higher hydrophilicity than the hydrophobic nonwoven fabric. As the hydrophilic nonwoven fabric (non-skin side panel 32) used in this embodiment, its contact angle with ion-exchanged water is preferably less than 90°, more preferably less than 50°. On the other hand, as the hydrophobic nonwoven fabric (skin side panel 31), its contact angle with ion-exchanged water is preferably more than 90°, more preferably more than 120°.

[0078] In addition, as explained later, the degree of hydrophilicity can also be compared by comparing the amount of hydrophilic oil per unit volume contained in the nonwoven fabric.

[0079] For example, the contact angle can be measured using the MCA-J contact angle meter manufactured by Kyowa Interface Science Co., Ltd., by the following method: First, drop approximately 20 picoliters of ion-exchanged water onto the surface of the fibers constituting the sheet component (the sheet being measured), and then immediately measure the contact angle using the contact angle meter. Measurements are performed at multiple locations (e.g., five or more locations) on the surface of the sheet being measured, and the average value is taken as the contact angle. Furthermore, the ambient temperature for the measurement is set to 22°C.

[0080] Alternatively, one can photograph the measured piece with ion-exchanged water dropped on it from the cross-sectional direction of the measured piece, analyze the photographed image, and measure the angle between the droplet of ion-exchanged water and the measured piece to measure the contact angle.

[0081] <On water absorption and transpiration>

[0082] The mechanism by which a diaper 1 made of hydrophilic nonwoven fabric absorbs moisture such as sweat from the wearer's skin and causes the absorbed moisture to evaporate into the atmosphere is explained. Figures 5A-5C This diagram illustrates the basic principle of moisture absorption and evaporation in diaper 1. Figures 5A-5C The cross-section of the front waist section 30 of the components constituting the diaper 1 is schematically shown.

[0083] First, such as Figure 5AAs shown, when the wearer wears diaper 1, the skin side panel 31 (hydrophobic nonwoven fabric) of the front waist portion 30, positioned on the skin side in the thickness direction, comes into contact with the wearer's skin. As described above, the skin side panel 31 of this embodiment is made of SMS nonwoven fabric and contains meltblown fibers with a fiber diameter smaller than that of spunbond fibers. Therefore, the skin side panel 31 has a portion where the finer meltblown fibers are tightly wound, resulting in a narrower distance between the fibers. This structure creates capillary action in the skin side panel 31, thereby easily absorbing moisture such as sweat adhering to the wearer's skin.

[0084] Next, as Figure 5B As shown, moisture absorbed by the skin-side sheet 31 is transferred to the non-skin-side sheet 32 ​​(hydrophilic nonwoven fabric), which is layered adjacent to the skin-side sheet 31 on the non-skin side. This is because, since the skin-side sheet 31 is a hydrophobic nonwoven fabric, while the non-skin-side sheet 32 ​​is a hydrophilic nonwoven fabric, a difference in hydrophilicity (hydrophilic gradient) is created between the two sheets. Moisture easily moves from the less hydrophilic skin-side sheet 31 to the more hydrophilic non-skin-side sheet 32. Therefore, moisture is difficult to retain on the skin-side sheet 31, which is in contact with the wearer's skin, and is easier to retain on the non-skin-side sheet 32, which is not in contact with the wearer's skin.

[0085] Moisture retained in the non-skin side 32 evaporates from the non-skin side of the non-skin side 32 into the atmosphere. For example... Figure 5C As shown, when no other components (sheet components) are disposed on the non-skin side of the non-skin side sheet 32, the entire surface of the non-skin side of the non-skin side sheet 32 ​​faces the atmosphere. That is, the interface area between the non-skin side sheet 32 ​​and the atmosphere becomes larger, thereby making it easier for moisture to evaporate.

[0086] In this way, within the waistband component 20 of the diaper 1, moisture absorbed from the wearer's skin by the hydrophobic nonwoven fabric on the skin side is transferred to the hydrophilic nonwoven fabric on the non-skin side, and released into the atmosphere from the non-skin side surface of the hydrophilic nonwoven fabric. That is, it can absorb moisture and efficiently evaporate it into the atmosphere. Therefore, moisture does not easily come into contact with the wearer's skin, thereby preventing the wearer's skin from becoming damp and causing skin problems such as rashes or discomfort.

[0087] <Regarding the lateral joint 50>

[0088] Thus, in diaper 1, absorbency is improved by locally using a hydrophilic nonwoven fabric containing a hydrophilic oil agent in the waistband components 20 (30, 40). On the other hand, due to the effect of the hydrophilic oil agent contained in the nonwoven fabric, the following problems may occur in the side joint 50.

[0089] Figure 6This is a cross-sectional schematic diagram of the lateral joint 50, which joins the front waist section 30 and the rear waist section 40, when viewed from the top and bottom. (As shown...) Figure 6 As shown, at the outer end of the waist member 20 in the left-right direction, the front waist part 30 and the rear waist part 40 are joined in an overlapping state in the thickness direction, thereby forming a side joint 50. In addition, in the side joint 50, the skin side plate 31 of the front waist part 30 and the skin side plate 41 of the rear waist part 40 are arranged opposite to each other and joined in the thickness direction.

[0090] In this embodiment, since the side joint portion 50 of the diaper 1 is joined using welding methods such as ultrasonic welding, problems may arise if the surfaces facing each other in the thickness direction of the side joint portion 50 are hydrophilic nonwoven fabrics. Specifically, if both the skin side sheet 31 of the front waist portion 30 and the skin side sheet 41 of the rear waist portion 40 are hydrophilic sheets containing hydrophilic oils, the welding strength of the ultrasonic welding may become insufficient due to the coating formed by the hydrophilic oils.

[0091] In such a situation, when diaper 1 is worn, the joint of the side joint 50 may peel off, causing diaper 1 to become unusable. Figure 1 The case shown is a shorts-type shape. For example, when the wearer is wearing a shorts-type diaper 1, they perform an action of passing their legs through the leg opening LH of the diaper 1 and lifting the diaper 1 from the toe side to the crotch side. At this time, since stress tends to concentrate at the lower end of the side joint 50 (the upper end of the leg opening LH), if the bonding strength of the side joint 50 is insufficient, its lower end may become the starting point of peeling, causing the side joint 50 to peel off completely.

[0092] In contrast, in this embodiment, the skin-side sheets 31 and 41 facing each other along the thickness direction in the side joint 50 are both formed of hydrophobic nonwoven fabric that does not contain hydrophilic oils. That is, the skin-side surfaces of the front waist portion 30 and the rear waist portion 40 have hydrophobic sheets with a lower content of hydrophilic oil per unit volume. Therefore, compared to the case where the side joint 50 is arranged opposite to hydrophilic sheets with a higher content of hydrophilic oil, the bonding strength of the side joint 50 is less likely to decrease. As a result, it is possible to suppress the peeling of the lower end of the side joint 50 during the wearing action of the diaper 1, thereby easily maintaining the shorts-shaped shape.

[0093] Furthermore, if at least one of the skin side sheets 31 and 41, which are opposite each other along the thickness direction, has a hydrophobic sheet portion, the influence of the oil film of the hydrophilic oil formed on the opposite surface of the lateral joint 50 is reduced, thus making it easier to suppress the decrease in joint strength. In this embodiment, as... Figure 6As shown, the skin-side sheet 31 and skin-side sheet 41, located closest to the skin, are both made of hydrophobic nonwoven fabric. In other words, a hydrophobic sheet is provided at the lower end of the side joint 50 on either the skin-side surface of the front waist portion 30 or the skin-side surface of the rear waist portion 40. Therefore, the influence of hydrophilic oils at the lower end of the side joint 50 is reduced, making it easier to suppress the decrease in bond strength.

[0094] The content of hydrophilic oil per unit volume in each sheet component can be measured as follows: First, the hydrophilic oil is extracted from the sheet component. Approximately 5g of the sheet component to be tested is cut to obtain a sample. The absolute dry weight is determined. The sample is gently placed into a Soxhlet extractor as specified in JIS R 3503 without using an extraction sleeve. Then, 100mL to 150mL of a mixture of JIS K 8102 grade ethanol and JIS K 8858 grade benzene (volume ratio 1:2) (hereinafter referred to as the ethanol-benzene mixture) is added to the attached flask. However, when using a recovered ethanol-benzene mixture, it is prepared to have a water content of (1.7±0.5)%. Then, place the sample in a water bath and heat the extract for 3 hours until it is weakly kept boiling. Pour the solution accumulated in the sample section back into the flask. After concentrating the contents of the flask to 5 mL (filtered with a 1G1 or 3G1 glass filter if necessary), transfer it to a weighing bottle pre-weighed at 105±2 °C. Clean the extraction flask with an ethanol-benzene mixture at approximately 40 °C. Add the cleaning solution to the weighing bottle (after filtration with the glass filter if using one). After the solvent evaporates in a water bath, place the flask in a desiccator at 105±2 °C for 1.5 hours, cool it in a desiccator, and weigh it. The extraction volume is expressed as a percentage of the ethanol-benzene mixture extraction volume relative to the absolute dry sample mass, and the average of two measurements is rounded to two decimal places according to Rule B (rounding method) of JIS Z8401. The value obtained by dividing the mass of the extracted oil by the volume of the sample is taken as the content of hydrophilic oil per unit volume in the sheet component.

[0095] Additionally, hydrophobic skin patches 36 and 46 are respectively provided on the skin side of the lower end of the side joint 50 of the diaper 1. Figure 2 and Figure 3In the middle section, a skin sheet 36 is provided at the position closest to the skin between the center and the lower end of the side portion 30sw (50) in the vertical direction of the front waist section 30, thereby providing a sparse water sheet portion that overlaps at least partially by two layers in this area. Similarly, a sparse water sheet portion is provided at the position closest to the skin between the center and the lower end of the side portion 40sw (50) in the vertical direction of the rear waist section 40, overlapping by two layers. Furthermore, due to Figure 3 The central section (section AA) in the left-right direction is shown, therefore this Figure 3 The diagram shows an absorbent body 10 disposed between skin face 36 (46) and skin side 31 (41).

[0096] By providing two overlapping layers of hydrophobic sheets along the thickness direction on the skin-side surface of the waist member 20, the influence of the hydrophilic oil contained in the hydrophilic sheets on the non-skin-side in the side joint 50 is reduced, thereby making it easier to suppress the decrease in joint strength. Alternatively, three or more overlapping layers of hydrophobic sheets can be provided on the skin-side surface of the waist member 20. This further reduces the influence of the hydrophilic sheets on the non-skin-side.

[0097] In addition, such as Figure 2 As shown, the lower end 36b (46b) of the skin sheet 36 (46) is located between the central position and the lower end position in the vertical direction of the front waist portion 30 (40). As described above, since the influence of the hydrophilic oil is less in the area where the skin sheet 36 is provided, the bonding strength of the side joint 50 can be stronger than that of other areas. Therefore, when the diaper 1 is worn, even if peeling occurs at the lower end of the side joint 50 and the peeling spreads upward along the side joint 50 in the vertical direction, the spread of peeling can be prevented at the lower end position 36b (46b) of the skin sheet 36 (46). That is, the skin sheet 36 functions as an anti-tearing part of the side joint 50, thereby suppressing the overall peeling of the side joint 50. As a result, the diaper 1 can easily maintain a shorts-like shape.

[0098] Alternatively, in the waistband 20 (30, 40) of the diaper 1, a hydrophobic sheet (skin side sheet 31, 41) can be provided at the position closest to the skin in the entire area from the top to the bottom of the side joint 50 in the vertical direction. With such a structure, it is easy to suppress the reduction of the bonding strength as a whole of the side joint 50, and the shorts-shaped shape of the diaper 1 can be easily and stably maintained.

[0099] On the other hand, in diaper 1, such as Figure 3As shown, sometimes a folded portion 32f (42f) is provided at the upper end of the front waist section 30 (40) in the vertical direction, forming a folded-back portion 32f (42f) formed by folding the non-skin side sheet 32 ​​(42) back towards the skin. In this case, a hydrophilic sheet is provided at the upper end of the side joint 50 in the vertical direction, at the position closest to the skin. That is, the upper end of the side joint 50 in the vertical direction contains a larger amount of hydrophilic oil per unit volume compared to the lower end. Therefore, the bonding strength at the upper end of the side joint 50 of the diaper 1 is lower than the bonding strength at the lower end.

[0100] The following is explained: Since the upper end of the side joint 50 is easily subjected to load during the wearing of the diaper 1, it is important to make the joint less prone to peeling. On the other hand, after using the diaper 1, when removing the diaper 1 from the wearer's body, the following action is performed: grasping the area near the upper end of the side joint 50 and pulling it back and forth, separating the front waist part 30 and the back waist part 40 connected by the side joint 50. That is, performing an action of tearing the side joint 50 from the upper end side to the lower side. Therefore, it is desirable to weaken the joint strength to some extent at the upper end of the side joint 50.

[0101] Especially Figure 3 In this design, a hydrophilic folded portion 32f (42f) is disposed at the upper end of the side joint 50, closest to the skin. That is, a hydrophilic sheet is provided at the upper end of the side joint 50, closest to the skin. Therefore, by having the hydrophilic sheets facing each other at this upper end, the bonding strength of the side joint 50 can be further weakened.

[0102] However, at the upper end of the side joint 50, the folded-back portion 32f (42f) does not need to be exposed at the position closest to the skin in the thickness direction. That is, the folded-back portion 32f (42f) can also be folded back towards the non-skin side compared to the skin side sheet 31 (41). In this case, since the amount of hydrophilic oil per unit volume at the upper end of the side joint 50 is increased, the effect described above can also be obtained. Alternatively, a hydrophilic sheet member (hydrophilic sheet portion) of a different hydrophilicity than the folded-back portion 32f (42f) can be provided at the upper end of the side joint 50.

[0103] Thus, in the diaper 1 of this embodiment, since the content of hydrophilic oil at the upper end of the side joint 50 is relatively high, the side joint 50 can be easily torn from the upper end side. That is, the side joint 50 of the diaper 1 has a structure that is not easy to peel from the lower end side but easy to peel from the upper end side. As a result, the user can put on and take off the diaper 1 without any pressure.

[0104] Furthermore, the presence of two or more layers of hydrophilic sheets at the upper end of the side joint 50 along its thickness direction enhances the strength of the waist member 20 in this area. Therefore, when removing the diaper 1, even if the front waist member 30 and the rear waist member 40 are pulled back and forth by grasping the upper end of the side joint 50, the sheet members constituting the front waist member 30 and the rear waist member 40 are less likely to break. That is, the force of pulling the waist member 20 back and forth does not tear the fabric of the waist member 20, but rather easily peels off the side joint 50. Additionally, since the amount of hydrophilic oil per unit volume is greater in the portion with two or more layers of hydrophilic sheets, the bonding strength of the side joint 50 is weakened as described above. This makes it easier to peel the side joint 50 from the upper end side to the lower side.

[0105] Alternatively, compression sections can be provided on the skin side pieces 31 and 41 that constitute the waist component 20 (30, 40). Figure 7 This is a cross-sectional schematic diagram showing the cross-sectional shape of the front waist section 30 in the thickness direction.

[0106] exist Figure 7 In this design, the skin-side sheet 31 (hydrophobic sheet portion) is provided with multiple compression portions 31e that compress the skin-side sheet 31 from the non-skin side to the skin side in the thickness direction. By providing multiple compression portions 31e, 31e... on the surface of the skin-side sheet 31, the strength of the skin-side sheet 31 can be improved, thus making it less prone to breakage. Furthermore, in the compression portions 31e, the compressed bottom (made of...) Figure 7 The diagonally lined portion (indicated by the section shown) is positioned at a predetermined distance separated from the non-skin side sheet 32 ​​(hydrophilic sheet portion) along the thickness direction. Therefore, the compression portion 31e is less affected by the hydrophilic oil contained in the non-skin side sheet 32 ​​(hydrophilic sheet portion), making it easier to suppress the decrease in the bonding strength of the side joint portion 50. This helps to prevent the side joint portion 50 from peeling off from its lower end.

[0107] Furthermore, it is preferable that, when the lateral joint 50 is viewed along the thickness direction, the diaper 1 has a portion in which the position of the compression portion 31e provided on the front waist portion 30 and the position of the compression portion 41e provided on the rear waist portion 40 do not overlap. Figure 8 This is a cross-sectional schematic diagram showing the relationship between the position of the compression part 31e of the front waist part 30 and the position of the compression part 41e of the rear waist part 40 in the side joint 50.

[0108] In Figure 8 In the middle section, when viewed along the thickness direction, the positions of compression section 31e and compression section 41e are staggered. That is, the bottoms of the compression sections 31e and 41e, which have higher stiffness (made by...) Figure 8The portions indicated by the diagonal lines are arranged in offset positions. Therefore, excessive stiffness at the side joint 50 can be prevented, thus reducing the skin feel when wearing the diaper 1. Furthermore, if the bottoms of the compression portions 31e and 41e, which have high stiffness, overlap, poor welding may occur when forming the side joint 50. To address this, the bottoms of the compression portions 31e and 41e are offset, thereby reducing the likelihood of poor welding. Therefore, peeling at the lower end of the side joint 50 can be easily prevented.

[0109] <Modified Examples of Installation Methods for Waist Elastic Members 35 and 45>

[0110] In the above embodiment, the waist elastic members 35 and 45 are installed on the waist member 20 using an adhesive method such as a hot melt adhesive. However, the installation method of the waist elastic members 35 and 45 is not limited to this. For example, the waist elastic members 35 and 45 can also be installed on the waist member 20 using a welding method such as ultrasonic welding. Furthermore, since ultrasonic welding is a known technology, a description of ultrasonic welding is omitted in this specification.

[0111] Figure 9A and Figure 9B This figure illustrates a method for mounting the waist elastic member 35 to the front waist portion 30 using welded portions 60. In this modified example, the waist elastic member 35 is mounted to the front waist portion 30 using multiple welded portions 60, 60... distributed in both the left-right and up-down directions. Each welded portion 60 is formed into a generally rectangular shape by ultrasonic welding, and they join the skin side panel 31 and non-skin side panel 32 of the front waist portion 30 in the thickness direction. Furthermore, the waist elastic member 35 is clamped from both sides in the up-down direction by a pair of welded portions 60, 60 formed by two adjacent welded portions 60, 60 in the up-down direction, thereby mounting the waist elastic member 35 to the front waist portion 30.

[0112] like Figure 9A As shown, the pair of weld portions 60, 60 constituting the weld portion pair 60s are arranged with a vertical spacing GH60 between them. Furthermore, the size of the spacing GH60 is set to be the same as or slightly larger than the diameter d35t of the waist elastic member 35 in its extended state (GH60 ≥ d35t). That is, the waist elastic member 35 in its extended state is positioned vertically between the weld portions 60s.

[0113] Next, if the elastic member 35 of the waist relaxes from its extended state, then as Figure 9BAs shown, the waist elastic member 35 contracts in the left-right direction while expanding in the up-down direction, and its diameter d35 in its natural state becomes larger than the vertical distance GH60 between the welded portions 60s (d35 > GH60). Therefore, the waist elastic member 35 is clamped between the welded portions 60s in the up-down direction. This results in the waist elastic member 35 being mounted on the front waist portion 30.

[0114] In addition, Figure 1 In the shorts-type diaper 1, the waist elastic member 35 (45) is in its relaxed natural state after being stretched as described above. Furthermore, in the shorts-type diaper 1, the waist elastic member 35 (45) is attached to the front waist portion 30 (back waist portion 40) via lateral joints 50, 50 on both sides in the left and right directions. Therefore, when wearing the diaper 1, even if the front waist portion 30 (back waist portion 40) stretches in the left and right directions, the waist elastic member 35 (45) will not detach from the waist member 20.

[0115] ===Second Implementation Method===

[0116] In the second embodiment, a shorts-type diaper 2 (hereinafter also referred to as "diaper 2") with a structure that is different from that in the first embodiment will be described. Figure 10A This is a top view of diaper 2 in its unfolded and extended state. Figure 10B yes Figure 10A A rough cross-sectional view at line BB. Furthermore, Figure 10A and Figure 10B The directions (e.g., longitudinal direction, transverse direction, etc.) are the same as those defined in the first embodiment.

[0117] The diaper 2 of the second embodiment has an absorbent body 10 that absorbs liquid and a waist member 20 disposed on the non-skin side of the absorbent body 10. However, in the diaper 2, the front waist portion 30 and the rear waist portion 40 are integrally formed. That is, the diaper 2 is a so-called two-piece disposable diaper composed of an absorbent body 10 as an inner body and a waist member 20 as an outer body.

[0118] In Figure 10A When the diaper 2 in its unfolded state is formed into a shorts shape, the absorbent body 10 and the waistband 20 are folded together with the central position CL in the longitudinal direction as the folding position. The side portions 30sw and 40sw of the front waistband 30 and the rear waistband 40, which are opposite each other in this folded state, are joined together in the left and right directions to form a pair of side joints 50, 50. Thus, with... Figure 1 Similarly, the diaper 2 becomes a shorts-shaped diaper with a waist opening BH and a pair of leg openings LH, LH.

[0119] In diaper 2, since the basic structure and function of the absorbent body 10 are substantially the same as those of diaper 1 in the first embodiment, descriptions are omitted. Furthermore, in Figure 10A In the diaper 2, the crotch portion at the central position CL in the longitudinal direction (the length direction of the absorbent body 10) has a portion whose width in the left-right direction is wider than the width in the left-right direction of the waist member 20. Therefore, when the diaper 2 is worn, in the area near the crotch of the wearer, the two end edges (edges) of the absorbent body 10 in the left-right direction contact the wearer's legs.

[0120] Furthermore, in diaper 2, the portion of the waist member 20 that is forward of the central position CL in the longitudinal direction (the length direction of the absorbent body 10) becomes the front waist part 30, and the portion that is backward of the central position CL becomes the rear waist part 40. The waist member 20 has a skin side sheet 21, a non-skin side sheet 22 that is stacked adjacent to the skin side sheet 21 on the non-skin side of the skin side sheet 21, and waist elastic members 35 and 45 (see reference) disposed between the skin side sheet 21 and the non-skin side sheet 22 in the thickness direction. Figure 10B ).

[0121] The skin-friendly side panel 21 is made of the same hydrophobic nonwoven fabric as the skin-friendly side panel 31 of diaper 1. The non-skin-friendly side panel 22 is made of the same hydrophilic nonwoven fabric as the non-skin-friendly side panel 32 of diaper 1. That is, the non-skin-friendly side panel 22 is made of a nonwoven fabric with a higher hydrophilicity than the skin-friendly side panel 21. In addition, similar to diaper 1, the waist elastic members 35 and 45 are made of elastic bands or the like, and they are installed between the skin-friendly side panel 21 and the non-skin-friendly side panel 22 in a state of elongation in the left and right directions.

[0122] In the diaper 2 of the second embodiment, similar to the diaper 1 of the first embodiment, it is also possible to easily suppress the peeling of the lower end of the side joint 50. That is, at the lower end of the side joint 50, the skin-closest surfaces of the front waist portion 30 and the rear waist portion 40 have a hydrophobic sheet portion with a low content of hydrophilic oil per unit volume. Therefore, compared with the case where the hydrophilic sheet portion is arranged opposite, the bonding strength of the side joint 50 is less likely to decrease. As a result, it is possible to suppress the peeling of the lower end of the side joint 50 during the wearing action of the diaper 2, thereby easily maintaining the shorts-like shape.

[0123] ===Third Implementation Method===

[0124] In the third embodiment, a shorts-type diaper 3 (hereinafter also referred to as "diaper 3") with a structure that differs from the structures of the first and second embodiments will be described. Figure 11A This is a top view of diaper 3 in its unfolded and extended state. Figure 11B yes Figure 11AA rough cross-sectional view at the CC line. Furthermore, Figure 11A and Figure 11B The directions (e.g., longitudinal direction, transverse direction, etc.) are the same as those defined in the first embodiment.

[0125] The diaper 3 of the third embodiment has an absorbent body 10 with absorbent properties and a waist member 20 disposed on the non-skin side of the absorbent body 10. However, as Figure 11B As shown, in diaper 3, a portion of the component constituting the front waist section 30 (skin side panel 21) and a portion of the component constituting the rear waist section 40 (skin side panel 21) are integrally formed. In the following text, this type of diaper will also be referred to as a simple three-piece disposable diaper.

[0126] In Figure 11A When the diaper 3 in its unfolded state is formed into a shorts shape, the absorbent body 10 and the waistband 20 are folded together with the central position CL in the longitudinal direction as the folding position. The side portions 30sw and 40sw of the front waistband 30 and the rear waistband 40, which are opposite each other in this folded state, are joined together in the left and right directions to form a pair of side joints 50, 50. Thus, with... Figure 1 Similarly, the diaper 3 becomes a shorts-shaped diaper with a waist opening BH and a pair of leg openings LH, LH.

[0127] In diaper 3, since the basic structure and function of the absorbent body 10 are substantially the same as those of diaper 1 in the first embodiment, the description is omitted.

[0128] Furthermore, in the diaper 3, the portion of the waist member 20 that is forward of the central position CL in the longitudinal direction (the length direction of the absorbent body 10) becomes the front waist part 30, and the portion that is backward of the central position CL becomes the rear waist part 40. The front waist part 30 has: a skin side sheet 21; the skin side of which extends from one end (ventral side) to the other end (dorsal side) in the longitudinal direction in the thickness direction; a non-skin side sheet 32, which is stacked adjacent to the skin side sheet 21 on the non-skin side of the skin side sheet 21 in the longitudinal direction on the front (ventral side); and a waist elastic member 35, which is disposed between the skin side sheet 21 and the non-skin side sheet 32 ​​in the thickness direction. The rear waist section 40 has a skin side plate 21 shared with the front waist section 30, a non-skin side plate 42 that is stacked adjacent to the skin side plate 21 on the non-skin side of the skin side plate 21 in the longitudinal direction (back side), and a waist elastic member 45 disposed between the skin side plate 21 and the non-skin side plate 42 in the thickness direction.

[0129] Skin side panel 21 is made of the same hydrophobic nonwoven fabric as skin side panel 31 of diaper 1. Non-skin side panels 32 and 42 are made of the same hydrophilic nonwoven fabric as non-skin side panels 32 and 42 of diaper 1. That is, non-skin side panels 32 and 42 are made of nonwoven fabric with higher hydrophilicity than skin side panel 21. In addition, similar to diaper 1, waist elastic members 35 and 45 are made of elastic bands or the like, and are installed between skin side panel 21 and non-skin side panels 32 and 42 in a state of elongation in the left and right direction.

[0130] In the diaper 3 of the third embodiment, similar to the diaper 1 of the first embodiment, it is also possible to easily suppress the peeling of the lower end of the side joint 50. That is, at the lower end of the side joint 50, the skin-closest surfaces of the front waist portion 30 and the rear waist portion 40 have a hydrophobic sheet portion with a low content of hydrophilic oil per unit volume. Therefore, compared with the case where the hydrophilic sheet portion is arranged opposite, the bonding strength of the side joint 50 is less likely to decrease. As a result, it is possible to suppress the peeling of the lower end of the side joint 50 during the wearing action of the diaper 2, thereby easily maintaining the shorts-like shape.

[0131] ===Other Implementation Methods===

[0132] The embodiments of the present invention have been described above, but these embodiments are intended to facilitate understanding of the invention and not to limit its interpretation. Furthermore, it is self-evident that the present invention can be modified and altered without departing from its spirit, and that equivalents are included in the present invention.

Claims

1. A pant-type absorbent article having an up-and-down direction, a left-and-right direction, and a front-and-back direction crossing each other, the pant-type absorbent article having a waist member and a liquid-absorbing absorbent main body, the waist member being formed by joining a front waist portion and a back waist portion in a ring shape with a pair of side joints provided at both side portions in the left-and-right direction, characterized in that the waist member has a hydrophilic sheet portion containing a hydrophilic oil agent, and a hydrophobic sheet portion containing the hydrophilic oil agent in a smaller amount per unit volume than the hydrophilic sheet portion, at a lower end portion of the side joint, a skin-facing surface of the front waist portion and a skin-facing surface of the back waist portion are joined in a state of facing each other, at least one of the skin-facing surface of the front waist portion and the skin-facing surface of the back waist portion is provided with the hydrophobic sheet portion, the hydrophobic sheet portion is provided with a plurality of compression portions that compress the hydrophobic sheet portion from a non-skin-facing side toward a skin-facing side.

2. The pant-type absorbent article according to claim 1, characterized in that at the lower end portion of the side joint, the hydrophobic sheet portion is provided at either one of the skin-facing surface of the front waist portion and the skin-facing surface of the back waist portion.

3. The pant-type absorbent article according to claim 1 or 2, characterized in that the hydrophilic sheet portion is provided at either one of a non-skin-facing surface of the front waist portion and a non-skin-facing surface of the back waist portion.

4. The pant-type absorbent article according to claim 1 or 2, characterized in that the pant-type absorbent article has a portion in which a position of the compression portion provided at the front waist portion and a position of the compression portion provided at the back waist portion do not overlap when the side joint is viewed in a thickness direction.

5. The pant-type absorbent article according to claim 1 or 2, characterized in that at the both side portions of the waist member, the hydrophobic sheet portion is provided at a skin-facing position between a central position and a lower end position in the up-and-down direction.

6. The pant-type absorbent article according to claim 5, characterized in that a skin surface sheet that is hydrophobic is provided at a skin-facing surface of the waist member, a lower end of the skin surface sheet is located between the central position and the lower end position in the up-and-down direction at the both side portions of the waist member.

7. The pant-type absorbent article according to claim 1 or 2, characterized in that the hydrophobic sheet portion is provided at skin-facing surfaces of the front waist portion and the back waist portion in an entire region from an upper end to a lower end in the up-and-down direction of the side joint.

8. The pant-type absorbent article according to claim 1 or 2, characterized in that an amount of the hydrophilic oil agent contained per unit volume at an upper end portion of the side joint is larger than an amount of the hydrophilic oil agent contained per unit volume at a lower end portion of the side joint.

9. The pant-type absorbent article according to claim 1 or 2, characterized in that The side joint portion is provided with two or more layers of the hydrophilic sheet portion at the upper end portion.

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