Disposable diaper

Abstract

The disposable diaper (1) has a longitudinal direction, a width direction, and a thickness direction which intersect each other in an unfolded and stretched state, and includes a one-side waist portion formed on one side in the longitudinal direction, a other-side waist portion formed on the other side in the longitudinal direction, and a crotch portion. The disposable diaper is provided with an insect repellent (AM), and is characterized in that, in a test of the number of insects attracted to the disposable diaper (1) within 20 minutes after being taken out of a package, the average number of insects fixed to the crotch portion is less than the average number of insects fixed to the one-side waist portion and the other-side waist portion.

Description

Technical Field

[0001] This invention relates to a disposable diaper. Background Technology

[0002] Traditionally, disposable absorbent articles for absorbing excrement such as feces and urine are known. Patent Document 1 discloses a disposable absorbent article containing insect-repellent microcapsules, which are made by microencapsulating a substance that exhibits an insect-repellent effect, and are known to effectively prevent pests from entering the absorbent article during distribution and storage.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Publication No. 2012-522618 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] In addition to absorbent materials, insect-repellent properties are also required. In particular, disposable diapers are targeted at infants and the elderly, whose legs (especially their thighs and calves) are more susceptible to insect bites than their faces. Therefore, insect-repellent properties of the absorbent materials are also required during use, and the effectiveness increases with the inclusion of more insect-repellent substances in the absorbent materials. However, this carries the risk of increasing the manufacturing cost of the absorbent materials.

[0008] The present invention was made in view of conventional problems such as those described above, and an aspect of the present invention is to reduce the risk of overuse of insect repellents in disposable diapers while effectively demonstrating insect repellency to the wearer's leg area.

[0009] Solution for solving the problem

[0010] The main aspect of the present invention that achieves the above-mentioned aspects is a disposable diaper having intersecting longitudinal, width, and thickness directions in both unfolded and stretched states. The disposable diaper includes: a side waist portion disposed on one side in the longitudinal direction; a other side waist portion disposed on the other side in the longitudinal direction; and a crotch portion. The disposable diaper contains an insect repellent, and when an insect counting test is conducted on the disposable diaper within 20 minutes of removing it from the packaging, the average number of insects attracted to the crotch portion is less than the average number of insects attracted to the side waist portion and the other side waist portion.

[0011] A key aspect of the present invention achieving the above-mentioned aspects is a disposable diaper having intersecting longitudinal, width, and thickness directions in both an unfolded and stretched state. The disposable diaper includes: a side waist portion disposed on one side in the longitudinal direction; a other side waist portion disposed on the other side in the longitudinal direction; and an absorbent core. The disposable diaper contains an insect repellent. The disposable diaper also has: a reference region, which is a square with a length of 1 cm in both the longitudinal and width directions; a comparison region, which is a square with a length of 1 cm in both the longitudinal and width directions; and... The reference region overlaps with the absorbent core when viewed in the thickness direction at the other end region. The reference region is located between the center of the disposable diaper and the other end of the absorbent core in the longitudinal direction. The other end region is the region from one end to the other end in the width direction of the other side waist portion. The other end region is a region with a length of 1 cm on one side starting from the other end of the disposable diaper. Regardless of the position of the comparison region in the other end region, the basis weight of the repellent in the reference region is higher than the basis weight of the repellent in the comparison region.

[0012] A key aspect of the present invention achieving the above-mentioned aspects is a disposable diaper having intersecting longitudinal, width, and thickness directions in both an unfolded and stretched state. The disposable diaper includes: a side waist portion disposed on one side in the longitudinal direction; a other side waist portion disposed on the other side in the longitudinal direction; and a crotch portion. The disposable diaper has an insect repellent. The crotch portion has: a non-skin side panel located at the closest point to the non-skin side; and a skin side panel adjacent to the non-skin side panel on the skin side. The non-skin side panel and the skin side panel are bonded together by an adhesive. The crotch portion has a side crotch region and a side crotch region. The side crotch region is the region extending from one end of the crotch portion to the center of the disposable diaper in the longitudinal direction. The other side crotch region is the region extending from the other end of the crotch portion to the center of the disposable diaper in the longitudinal direction. The maximum peel strength between the non-skin side panel and the skin side panel in the entire other side crotch region is higher than the maximum peel strength between the non-skin side panel and the skin side panel in the entire side crotch region.

[0013] Other features of the invention, besides those described above, will become clear from the description of this specification in conjunction with the accompanying drawings.

[0014] The effects of the invention

[0015] According to the present invention, a disposable diaper is provided that can effectively repel insects to the wearer's leg area while reducing the risk of overuse of insect repellents. Attached Figure Description

[0016] [ Figure 1 ] Figure 1 This is a schematic three-dimensional diagram of a disposable underwear-type diaper 1.

[0017] [ Figure 2 ] Figure 2 This is a diagram of diaper 1 in its concealed state, viewed from the rear.

[0018] [ Figure 3 ] Figure 3 This is a schematic plan view of diaper 1 in an unfolded and stretched state, viewed from the skin side.

[0019] [ Figure 4 ] Figure 4 yes Figure 3 A schematic cross-sectional view at the center line CC.

[0020] [ Figure 5 ] Figure 5 This is an illustration of an experiment to attract and count insects.

[0021] [ Figure 6 ] Figure 6 A shows the results of an insect counting experiment on diaper 1 within 20 minutes of being removed from the packaging. Figure 6 B shows the results of an insect counting experiment on diaper 1 4 hours after it was removed from the packaging.

[0022] [ Figure 7 ] Figure 7 This is an explanatory diagram illustrating the reference region aa and the comparison region ab.

[0023] [ Figure 8 ] Figure 8 This is an explanatory diagram showing the various areas of diaper 1.

[0024] [ Figure 9 ] Figure 9 This is an explanatory diagram showing the various areas of diaper 1. Detailed Implementation

[0025] The following will become clear from the description in this specification and the accompanying drawings.

[0026] (Aspect 1)

[0027] A disposable diaper, in its unfolded and stretched state, has intersecting longitudinal, width, and thickness directions. The disposable diaper includes: a side waist portion disposed on one side in the longitudinal direction; a other side waist portion disposed on the other side in the longitudinal direction; and a crotch portion. The disposable diaper contains an insect repellent. When an insect counting test is conducted on the disposable diaper within 20 minutes of removing it from its packaging, the average number of insects attracted to the crotch portion is less than the average number of insects attracted to the side waist portion and the other side waist portion.

[0028] According to aspect 1, the disposable diaper can effectively repel insects in the wearer's leg area while reducing the risk of overuse of insect repellents.

[0029] (Aspect 2)

[0030] According to aspect 1, when an insect-attracting test is conducted on the disposable diaper 4 hours after it has been removed from the packaging, the average number of insects attracted to the crotch area after 4 hours is less than the average number of insects attracted to one side of the waist and the other side of the waist after 4 hours.

[0031] According to aspect 2, the disposable diaper can effectively repel insects in the wearer's leg area for a long period of time while reducing the risk of overuse of insect repellents.

[0032] (Aspect 3)

[0033] A disposable diaper, in its unfolded and stretched state, has intersecting longitudinal, width, and thickness directions. The disposable diaper includes: a side waist portion disposed on one side in the longitudinal direction; a other side waist portion disposed on the other side in the longitudinal direction; and an absorbent core. The disposable diaper contains an insect repellent. The disposable diaper has: a reference region, which is a square with a length of 1 cm in both the longitudinal and width directions; a comparison region, which is a square with a length of 1 cm in both the longitudinal and width directions; and a other side end region. The reference region overlaps with the absorbent core when viewed in the thickness direction. The reference region is located between the center of the disposable diaper and the other end of the absorbent core in the longitudinal direction. The other side end region is the area of ​​the other side waist portion in the width direction from one end to the other end, and has a length of 1 cm from the other end of the disposable diaper on one side. Regardless of the position of the comparison region in the other side end region, the basis weight of the repellent in the reference region is higher than the basis weight of the repellent in the comparison region.

[0034] According to aspect 3, the disposable diaper can effectively repel insects in the wearer's leg area while reducing the risk of overuse of insect repellents.

[0035] (Aspect 4)

[0036] According to aspect 3, the center of the reference region is located between the central position of the disposable diaper and the position of the other end of the absorbent core in the longitudinal direction, and is located in the center of the disposable diaper in the width direction, and the basis weight of the repellent in the reference region is higher than that in the comparison region, regardless of the position of the comparison region in the other end region.

[0037] According to aspect 4, disposable diapers can effectively repel insects in the wearer's leg area while reducing the risk of overuse of insect repellents.

[0038] (Aspect 5)

[0039] A disposable diaper, in its unfolded and stretched state, has intersecting longitudinal, width, and thickness directions. The disposable diaper includes: a side waist portion disposed on one side in the longitudinal direction; a other side waist portion disposed on the other side in the longitudinal direction; and a crotch portion. The disposable diaper has an insect repellent. The crotch portion has: a non-skin side panel located at the closest point to the non-skin side; and a skin side panel adjacent to the non-skin side panel on the skin side. The non-skin side panel and the skin side panel are bonded together by an adhesive. The crotch portion has a side crotch region and a side crotch region. The side crotch region is the area extending from one end of the crotch portion to the center of the disposable diaper in the longitudinal direction. The other side crotch region is the area extending from the other end of the crotch portion to the center of the disposable diaper in the longitudinal direction. The maximum peel strength between the non-skin side panel and the skin side panel in the entire other side crotch region is higher than the maximum peel strength between the non-skin side panel and the skin side panel in the entire side crotch region.

[0040] The higher the maximum peel strength between the non-skin side panel and the skin side panel, the stronger the adhesion between them. This makes it less likely that spaces will form between the non-skin side panel and the skin side panel due to peeling. This reduces the risk of the non-skin side panel and the skin side panel rubbing against each other in the spaces between these panels during wear, causing unevenness on the surface of the panels. According to the disposable diaper of aspect 5, by making it less likely that unevenness will form on the surface due to peeling between the non-skin side panel and the skin side panel, the risk of insects such as mosquitoes landing on the opposite crotch area can be reduced, thereby allowing for a reduction in the amount of insect repellent used in the disposable diaper while exhibiting an insect-repellent effect in the opposite crotch area.

[0041] (Aspect 6)

[0042] According to aspect 5 of the disposable diaper, the maximum basis weight of the repellent in the other crotch area is higher than the maximum basis weight of the repellent in the one crotch area.

[0043] According to aspect 6, the disposable diaper reduces the formation of unevenness on the surface due to peeling between the non-skin side panel and the skin side panel. This reduces the risk of insects such as mosquitoes landing on the crotch area on one side of the waist, and combined with the effect of insect repellent applied to one side of the crotch area, it can increase the insect repellency on one side of the diaper while reducing the risk of overuse of insect repellent.

[0044] (Aspect 7)

[0045] According to aspect 5, in the disposable diaper, the maximum basis weight of the repellent in the crotch area on one side is higher than the maximum basis weight of the repellent in the crotch area on the other side.

[0046] According to aspect 7, the disposable diaper reduces the formation of unevenness on the surface due to peeling between the non-skin side panel and the skin side panel. Therefore, it reduces the risk of insects such as mosquitoes landing on the crotch area on the opposite side of the waist, and the repellent placed in the crotch area on one side reduces the risk of overuse of insect repellent. Furthermore, by allowing the insect repellent effect to work on both the front and back sides of the wearer, the risk of insect bites is reduced.

[0047] (Aspect 8)

[0048] According to any one of aspects 1 to 7, the disposable diaper, wherein the other side waist portion is the back waist portion.

[0049] According to aspect 8, disposable diapers can improve the repellency on the wearer's back side, since humans are unlikely to pay more attention to the back side than the ventral side, and can also improve the repellency on the wearer's back side when sleeping face down.

[0050] (Aspect 9)

[0051] According to any one of aspects 5 to 8, the disposable diaper has a crotch area having a central region and side regions, wherein when the crotch area is trisected in the width direction, the central region is the central region in the width direction, the side regions are all regions located on both sides of the central region, and in at least one region of the side crotch area and the other side crotch area, the maximum peel strength between the non-skin side piece and the skin side piece in the entire side region is higher than the maximum peel strength between the non-skin side piece and the skin side piece in the entire central region.

[0052] According to aspect 9, the disposable diaper reduces the risk of insects such as mosquitoes landing in the side area by reducing the peeling between the non-skin side piece and the skin side piece in the side area, making it easier to increase the repellency effect in the area near the leg opening of the disposable diaper.

[0053] (Aspect 10)

[0054] According to any one of aspects 5 to 8, the disposable diaper has a crotch area having a central region and side regions, wherein when the crotch area is trisected in the width direction, the central region is the central region in the width direction, the side regions are all regions located on both sides of the central region, and in at least one region of the one side crotch area and the other side crotch area, the maximum peel strength between the non-skin side piece and the skin side piece in the entire central region is higher than the maximum peel strength between the non-skin side piece and the skin side piece in the entire side region.

[0055] According to aspect 10, the disposable diaper reduces the risk of the non-skin side panel and the skin side panel being completely separated in the crotch area, exposing the unevenness of the non-skin side panel and the skin side panel over the entire area of ​​the crotch. This reduces the risk of insects such as mosquitoes landing in the crotch area and makes it easier to increase the repellency of the crotch area.

[0056] (Aspect 11)

[0057] According to any one of aspects 1 to 10, the disposable diaper has a crotch portion having a central region and side regions. When the crotch portion is trisected in the width direction, the central region is the central region in the width direction, and the side regions are all regions located on both sides of the central region. The crotch portion has a side crotch region and a side crotch region. The side crotch region is the region in the longitudinal direction from one side end of the crotch portion to the central position of the disposable diaper, and the other side crotch region is the region in the longitudinal direction from the other side end of the crotch portion to the central position of the disposable diaper. In at least one of the side crotch regions and the other side crotch region, the maximum basis weight of the repellent in the side region is higher than the maximum basis weight of the repellent in the central region.

[0058] According to aspect 11, the disposable diaper is more likely to increase the repellency effect in the area near the leg opening of the diaper when worn, compared to the case where the base weight of the repellent in the central area is made higher than that in the side areas.

[0059] (Aspect 12)

[0060] According to any one of aspects 1 to 10, the disposable diaper has a crotch portion having a central region and side regions, wherein when the crotch portion is divided into three equal parts in the width direction, the central region is the central region in the width direction, the side regions are all regions located on both sides of the central region, and the maximum basis weight of the repellent in the central region is higher than the maximum basis weight of the repellent in the side regions.

[0061] According to aspect 12 of the disposable diaper, placing the repellent in the central area can have an effect on the leg openings on both sides in the width direction, thereby reducing the risk of overuse of the repellent.

[0062] (Aspect 13)

[0063] According to any one of aspects 5 to 7, the disposable diaper has a first region and a second region in the other crotch area, wherein when the other crotch area is trisected in the longitudinal direction and the width direction, the first region is the central region in the longitudinal direction and the central region in the width direction, the second region is the region of the other crotch area excluding the first region, and the maximum peel strength between the non-skin side piece and the skin side piece in the entire first region is greater than or equal to the maximum peel strength between the non-skin side piece and the skin side piece in the entire second region.

[0064] According to aspect 13, the disposable diaper reduces the risk of the non-skin side panel being completely separated from the skin side panel in the opposite crotch area, exposing the unevenness of the non-skin side panel and the skin side panel over the entire area of ​​the opposite crotch area. This reduces the risk of insects such as mosquitoes landing on the crotch area of ​​one side of the disposable diaper, making it easier to increase the repellency effect of the crotch area.

[0065] (Aspect 14)

[0066] According to any one of aspects 1 to 13, the disposable diaper has a crotch portion having a side crotch area and a side crotch area, the side crotch area being a region extending from one end of the crotch portion to the center of the disposable diaper in the longitudinal direction, the other side crotch area being a region extending from the other end of the crotch portion to the center of the disposable diaper in the longitudinal direction, the other side crotch area having a first region and a second region, wherein when the other side crotch area is trisected in the longitudinal direction and the width direction, the first region is the central region in the longitudinal direction and the central region in the width direction, the second region is the region of the other side crotch area excluding the first region, and the maximum basis weight of the repellent in the first region is equal to or greater than the maximum basis weight of the repellent in the second region.

[0067] According to aspect 14 of the disposable diaper, placing the repellent in the first area can have an effect on the leg openings on both sides in the width direction, thereby reducing the risk of overuse of the repellent.

[0068] (Aspect 15)

[0069] According to any one of aspects 1 to 14, the disposable diaper has a crotch portion having an absorbent core and a liquid-impermeable sheet disposed on a non-skin side relative to the absorbent core, and the repellent is disposed at least on a non-skin side relative to the liquid-impermeable sheet.

[0070] According to aspect 15, disposable diapers can reduce the risk of repellents placed on the non-skin side of liquid-impermeable pads seeping into the absorbent core.

[0071] (Aspect 16)

[0072] According to any one of aspects 1 to 15, the disposable diaper has a crotch portion having the repellent, the crotch portion having a marking portion indicating an area where the repellent is disposed, and when viewed in the thickness direction, the disposable diaper has a portion where the portion where the repellent is disposed overlaps with the marking portion.

[0073] According to aspect 16, disposable diapers make it easier for wearers to identify the repellent effect of the repellent.

[0074] ===Implementation Methods===

[0075] The disposable diaper according to this embodiment is described using an underwear-type disposable diaper for infants as an example. However, the disposable diaper according to this embodiment is not limited to the above; it may also be an underwear-type disposable diaper for adults, or a strip-type disposable diaper for infants or adults.

[0076] ===Basic Structure of Underwear-Type Disposable Diapers 1===

[0077] Figure 1 This is a schematic three-dimensional view of a disposable underwear-type diaper 1 (hereinafter also referred to as "diaper 1"). Figure 2 This is a diagram of diaper 1 in its concealed state, viewed from the rear. Figure 3 This is a schematic plan view of diaper 1 in an unfolded and stretched state, viewed from the skin side. Figure 4 yes Figure 3 A schematic cross-sectional view at the center line CC. Figure 3 The center line CC shown in the figure represents the center (central position) of the diaper 1 in the width direction, and the center line CL represents the center (central position) of the diaper 1 in the longitudinal direction.

[0078] The unfolded state of diaper 1 refers to the state in which the pair of connecting parts 2 on both sides of the panty-type diaper 1 are separated and the diaper 1 is opened and flat. The stretched state of diaper 1 refers to the state in which the elastic members of diaper 1 are stretched to the point that the wrinkles in diaper 1 are no longer visible. Specifically, the stretched state refers to the state in which the members constituting diaper 1 have been stretched until the size of the members matches or is close to the size of the members themselves (i.e., the size in the state in which the elasticity of the members is not manifested).

[0079] The panty-style diaper 1 includes a top-bottom direction, a width direction, and a front-back direction, and the diaper 1 forms a waist opening BH and a pair of leg openings LH (see...). Figure 2 In the front-back direction, the side that is the wearer's abdomen is the front side, and the side that is the wearer's back is the back side. Additionally, as... Figure 4 As shown, the diaper 1 has a thickness direction, and the side in the thickness direction that comes into contact with the wearer is the skin side, and the opposite side is the non-skin side.

[0080] The diaper 1 has an absorbent body 10 and waist portions 20 and 30, with the waist portions 20 and 30 positioned on the non-skin side of the absorbent body 10. The diaper 1 of this embodiment is a so-called three-piece diaper, and the waist portions include a front waist portion 20 and a back waist portion 30. In the portion of the absorbent body 10 located below the front waist portion 20 and the back waist portion 30, the non-skin side is exposed to the outside.

[0081] like Figure 3 and Figure 4 As shown, the non-skin side of the longitudinal front end of the absorbent body 10 is bonded to the skin side of the front waist section 20 using an adhesive or the like, and the non-skin side of the longitudinal rear end of the absorbent body 10 is bonded to the skin side of the rear waist section 30 using an adhesive or the like. From the position of Figure 3 Starting with the diaper 1 in its unfolded state, the absorbent body 10 is folded at the fold, so that the front waist section 20 and the back waist section 30 face each other. Then, the two sides of the front waist section 20 and the two sides of the back waist section 30 in the width direction are joined together by welding (e.g., heat welding or ultrasonic welding) to form a pair of joints 2, thereby making the diaper 1 into an underwear-like state. The fold F is provided at the longitudinal center of the diaper 1 in its unfolded state.

[0082] In this embodiment, in diaper 1, the area where the joint 2 is located in the vertical direction is referred to as the "front waist 1F" and the "back waist 1B", and the area below the front waist 1F and the back waist 1B is referred to as the "crotch 1C". Furthermore, the "crotch" is the area located below the wearer's crotch when worn. Specifically, in the case of underwear-type disposable diapers such as diaper 1, when the diaper is in underwear-type mode, the area below the joint 2 at both ends in the width direction is the crotch 1C. Furthermore, in the case of belt-type disposable diapers, when the disposable diaper is folded in half at the fold at the longitudinal center and divided into two equal parts in the longitudinal direction, the lowest area is the crotch.

[0083] The absorbent body 10 includes a liquid-permeable top sheet 11, an absorbent core 12 for absorbing excrement, a liquid-impermeable back sheet 13, and an outer sheet 14, each of which is bonded together by an adhesive or the like. Examples of the absorbent core 12 include those formed by molding a mixture of liquid-absorbent fibers (such as pulp fibers) and highly absorbent polymers into a specific shape. The absorbent core 12 may be covered with a core-wrapping sheet made of nonwoven fabric, liquid-permeable tissue paper, etc. Other examples of the absorbent core 12 include SAP sheets with an SAP layer attached to a hydrophilic sheet and air-laid sheets in which liquid-absorbent fibers are formed into a sheet using an air-laying method.

[0084] Additionally, the absorbent body 10 has leg elastic members 15 (e.g., elastic cords) on both sides in the width direction that stretch in the longitudinal direction (vertical direction). This allows the diaper 1 to fit snugly around the wearer's legs.

[0085] Furthermore, the absorbent body 10 has leak-proof wall portions 16 on both sides in the width direction that can stand upright toward the skin. For example, the leak-proof wall portions 16 are formed as follows: the two sides in the width direction of the outer sheet 14 are folded inward in the width direction in such a way that they are located on the skin side of the top sheet 11, and a leak-proof wall elastic member 161 (e.g., an elastic cord) that stretches and extends in the longitudinal direction is provided in the folded portion.

[0086] like Figure 4 As shown, the front waist section 20 (back waist section 30) has skin side panels 21 (31) and non-skin side panels 22 (32) made of flexible non-woven fabric or the like, and a plurality of waist elastic members 23 (33) (e.g., elastic cords) that stretch in the width direction. In the waist section 20 (30), the plurality of waist elastic members 23 (33) are arranged side by side at intervals in the vertical direction and are fixed to the panels in a stretched state in the width direction. Therefore, the front waist section 20 and the back waist section 30 can stretch in the width direction to fit around the wearer's waist.

[0087] The front waist section 20 may have a printed sheet 24 (e.g., a resin film made of polyethylene, polypropylene, etc.) between the skin side sheet 21 and the non-skin side sheet 22. Although not shown, the rear waist section 30 may also have a printed sheet between the skin side sheet 31 and the non-skin side sheet 32.

[0088] In addition, such as Figure 3 As shown, the front waist section 20 is rectangular in shape. Meanwhile, the rear waist section 30 has an extension 34 extending downwards from the rectangular joint 2. The extension 34 has a roughly trapezoidal shape, with its length decreasing downwards in the width direction.

[0089] Although the basic structure of diaper 1 has been described above, the structure of diaper 1 is not limited to the above. For example, diaper 1 can be a two-piece diaper. The front waist section 20 and the back waist section 30 can be formed as a single continuous member, or a waist section can be provided at the crotch to connect the front waist section 20 and the back waist section 30. In addition, the waist elastic members 23, 33 and the leg elastic members 15 can be elastic members in sheet form rather than elastic ropes (elastic membrane or elastic nonwoven fabric).

[0090] <<Insect Repellent AM>>

[0091] Diaper 1 contains an insect repellent AM. An insect repellent AM (hereinafter referred to as "repellent AM") is a repellent (insect repellent) targeting pests such as mosquitoes, midges, non-biting midges, and flies, and includes synthetic compounds or natural plant extracts containing ingredients with insect-repelling effects. For example, lemongrass, citronellal, 1,8-cineole, linalool acetate, N,N-diethyl-3-methylbenzamide (DEET), sesquiterpenes, ethyl butyl acetyl aminopropionate, picaridin, pyrethroids, cinnamon, rosemary, lavender, peppermint, eucalyptus, lemongrass, eucalyptus, and holy basil can be used. The repellent AM can be selected based on the target pest and the target wearer. In this embodiment, a separated aromatic agent extracted from lemongrass is used. Accordingly, the ingredient with insect-repelling effects (lemongrass) is applied to diaper 1. Alternatively, for example, repellent AM can be used, which uses a separate fragrance extracted from repellent ingredients such as lemongrass.

[0092] Furthermore, it is preferred that the repellent AM is a non-allergenic substance. For example, it is preferred that it substantially does not contain any of the 26 substances that must be listed as allergens on the label under the EU Cosmetics Directive (76 / 768 / EEC) (the proportion of such substances in the repellent AM is less than 1%). It is also preferred that the repellent AM does not impede the adhesive properties of the hot melt adhesive used in diaper 1.

[0093] Figure 2 The repellent AM mentioned above is also the repellent preparation area AM, which serves as the area where the repellent AM is applied. In this embodiment, the insect repellent AM is a volatile substance and is applied in liquid form. The repellent preparation area AM may be coated with only a synthetic compound or a natural plant extract containing components with insect-repelling effects. Furthermore, the repellent preparation area AM may, as appropriate, be coated with a liquid containing a solvent or other component (substance) that has been appropriately added to have insect-repelling effects.

[0094] It should be noted that in this embodiment, the repellent AM is applied to the diaper 1 in liquid form, but the present invention is not limited thereto. The insect repellent AM may be in solid form or in the form of microcapsules containing the repellent.

[0095] like Figure 2 As shown, in this embodiment, an insect repellent AM is provided on the back side of the diaper 1. Specifically, the repellent is provided on the lower side (folded portion F side) of the lower back 30 and on the upper side of the folded portion F (center line CL), and at approximately the center in the width direction. This makes it easier to achieve a repellent effect on the wearer's legs, thereby reducing the risk of the wearer's legs being bitten by mosquitoes.

[0096] Preferably, in the diaper 1 in its unfolded and stretched state, the repellent AM is provided at a position overlapping the absorbent core 12 when viewed along the thickness direction. Specifically, the area of ​​the diaper 1 where the repellent AM is provided is a rectangular area with a length of 30 mm in the longitudinal direction (vertical direction) and a length of 60 mm in the width direction. The size and shape of the area where the repellent AM is provided can be changed as needed. For example, the area can be a rectangular area with a length of 40 mm in the longitudinal direction and a length of 80 mm in the width direction, or it can be any other shape such as a circle, ellipse, or polygon. Therefore, even if the repellent AM evaporates, the material constituting the absorbent core still absorbs the repellent AM, allowing the diaper 1 to retain the repellent AM for a long period of time. In particular, when the absorbent core 12 includes liquid absorbent fibers (e.g., pulp fibers) and superabsorbent polymers (SAP), materials with porous surfaces are more likely to absorb the evaporated repellent AM.

[0097] <<The repelling effect of diaper 1>>

[0098] Traditionally, absorbent items such as disposable diapers are known to contain insect repellents. The more insect repellent incorporated into a disposable diaper, the greater the repellency. However, the more insect repellent incorporated, the higher the manufacturing cost. Furthermore, it is known that when wearing diaper 1, the wearer's lower body, such as the legs (especially the thighs and calves), is more susceptible to insect bites than the upper body, such as the face (on the ventral side). When wearing diaper 1, the wearer can easily see and reach the upper body, but it is difficult for them to see and reach the lower body. Therefore, regarding diaper 1, there is a need for an insect-repellent effect around the legs.

[0099] The diaper 1 of this embodiment contains insect repellent AM. Furthermore, when an insect count test was conducted on the diaper 1 within 20 minutes of removal from the packaging, the results showed that the average number of attracted insects in the crotch area 1C was less than the average number of attracted insects in the front waist area 1F and the back waist area 1B. The "insect count test" is a test used to measure the number of insects attracted to the diaper 1. By ensuring that the average number of attracted insects in the crotch area 1C is less than the average number of attracted insects in the front waist area 1F and the back waist area 1B in the insect count test, compared to the case where the average number of attracted insects in the crotch area 1C is equal to or greater than the average number of attracted insects in the front waist area 1F and the back waist area 1B, the repellency effect around the wearer's legs is more effective, while reducing the risk of overuse of insect repellent AM. It should be noted that the packaging is a container in which the diaper 1 is housed within a housing member, and generally, the diaper 1 is circulated and stored in its packaged state within the housing member. Diaper 1 within 20 minutes of being removed from the packaging means diaper 1 within 20 minutes of the moment when the unopened packaging is opened and the diaper is removed from the packaging.

[0100] In the insect counting experiment, measurements were taken in the following manner. Figure 5 This is a schematic diagram illustrating an experiment to attract and count insects. Figure 5 This is a schematic diagram omitting the insect testing method. First, samples are prepared in which a diaper is worn over a stocking on model D wearing the stocking. Samples are prepared as follows: Sample 1, in which a diaper 1 containing repellent AM is worn on model D within 20 minutes of being removed from the packaging; and Sample 2, in which a diaper without repellent AM is worn on model D. Sample 2 has the same construction as Sample 1, except that it does not contain repellent AM. A disposable hand warmer is placed on the front (or back) side of each sample. By placing the disposable hand warmer inside, the temperature of the sample becomes closer to body temperature, making the sample more attractive to insects. Model D is a balloon shaped similar to the body shape of an infant (around the waist and legs). Model D has a waist circumference of 47 cm and a leg circumference of 25 cm. The balloon material of model D is polyethylene. The stocking worn on model D is made of nylon and polyurethane. The sample worn on model D is in a state where the waist sections 20 and 30 are stretched by 180% and the leg openings LH are stretched by 250%. Then, as... Figure 5As shown, the samples were placed sequentially into a 50cm × 50cm × 50cm cube box B, and suspended from the top of box B by rope LO or similar means. An example of box B is, for instance, a breathable, highly visible nylon box covered with cloth. Box B contained 50 insects. The insects were adult female Aedes aegypti mosquitoes. The temperature in box B was 25°C and the humidity was 50%–70%. Then, based on the time elapsed after the samples were placed in box B, the number of insects attracted to each of the following areas of the sample—the waist 1F and 1B, and the crotch 1C—was measured. Specifically, the number of insects attracted to the measurement areas of the sample was measured at 5, 10, 20, 30, 60, and 120 minutes after placement in box B. The number of insects attracted to the waist 1F and 1B, and the crotch 1C over the elapsed time was used to calculate the average.

[0101] In insect counting experiments, a model made of multiple tubes can be used instead of a balloon shaped like an infant's body. For example, two cylindrical tubes or three cylindrical tubes can be used for insect counting experiments. An insect counting experiment using two cylindrical tubes can be conducted as follows: The sample is made into a polyurethane tube and inserted into each leg opening LH through the waist opening BH of the diaper 1, with the tube standing vertically to the ground. The sample in this position is placed in a box B similar to the one described above, and the number of insects attracted to the sample's measurement area is measured over each elapsed period of time. The average number of insects attracted to each of the waist sections 1F and 1B and the crotch section 1C over the elapsed time is calculated. The insect counting experiment using three cylindrical tubes can be conducted as follows: The sample is made into a polyurethane tube and inserted into each leg opening LH through the waist opening BH of the diaper 1 with the tube standing perpendicular to the ground and the tube having a diameter larger than the tube inserted into the leg opening LH. The sample in this state is placed in a box B similar to the one described above, and the number of insects attracted to the measurement area of ​​the sample is measured for each elapsed time. The average value is calculated based on the number of insects attracted to each of the waist 1F and 1B and the crotch 1C over the elapsed time.

[0102] Figure 6 A shows the results of an insect counting test on diaper 1 within 20 minutes of being removed from the packaging. Figure 6 A and Figure 6 B (described later) shows the average number of attracted insects at each time point in each measurement area; the result is the average of the results obtained from 6 (n) measurements. Figure 6 A and Figure 6In section B, "Total number of the waist section" represents the sum of the results for the front waist section 1F and the rear waist section 1B, and "Total number of the crotch section" represents the sum of the results for the front crotch section (front crotch area 1Ca) and the rear crotch section (rear crotch area 1Cb). Then, the average number of attracted insects is obtained by calculating the average number of attracted insects over each elapsed time period. For example, for the waist section (front and rear waist sections) of diaper 1, the sum of the average number of attracted insects over each elapsed time period (total of the average number of attracted insects in the waist section at each time point = 7.5) / 6 = 1.25, and the resulting average number of attracted insects is 1.3 insects.

[0103] like Figure 6 As shown in Figure A, the average total number of attracted insects in the waist section 1F and 1B of diaper 1 (sample 1) containing repellent AM is 1.3, and the average total number of attracted insects in the crotch section 1C is 0.3. Therefore, it is clear that the average number of attracted insects in the crotch section 1C is less than the average number of attracted insects in the front waist section 1F and the back waist section 1B. On the other hand, for sample 2 of diaper 1 without repellent AM, the average total number of attracted insects in the waist section 1F and 1B is 2.2, and the average total number of attracted insects in the crotch section 1C is 0.8. Thus, in diaper 1 containing repellent AM, by making the average number of attracted insects in the crotch section 1C less than the average number of attracted insects in the front waist section 1F and the back waist section 1B, a repellent effect can be achieved around the wearer's legs while wearing the diaper, while reducing the risk of diaper 1 containing excessive repellent AM.

[0104] Furthermore, regarding the diaper 1 containing repellent AM, examples of means for reducing the average number of attracted insects in the crotch 1C to be less than the average number of attracted insects in the front and rear sections 1F and 1B include: the composition, amount, or formulation of repellent AM in the diaper 1; applying repellent AM in liquid form; applying repellent AM in microcapsule form containing repellent AM; or other methods, such as increasing the peel strength between the parts of the diaper 1 to create irregularities on the surface of the parts, making it difficult for insects to land on the parts. For example, when repellent AM is applied over the entire diaper 1, the concentration of repellent AM in the crotch 1C can be higher than the concentration of repellent AM in the front and rear sections 1F and 1B. When repellent AM is applied over the entire diaper 1, the basis weight of repellent AM in the crotch 1C can be higher than the basis weight of repellent AM in the front and rear sections 1F and 1B. Furthermore, even when the area of ​​the repellent AM in the front waistband 1F and back waistband 1B is larger than the area of ​​the repellent AM in the crotch 1C, the concentration of the repellent AM in the crotch 1C can be higher than that in the front waistband 1F and back waistband 1B. Even when the area of ​​the repellent AM in the front waistband 1F and back waistband 1B is larger than that in the crotch 1C, the basis weight of the repellent AM in the crotch 1C can be higher than that in the front waistband 1F and back waistband 1B. Furthermore, when the concentration or basis weight of the repellent AM is uniformly applied across the entire diaper 1, the outer cover 14 and back cover 13 of the crotch 1C can have higher peel strength. The relationship between peel strength and repellency effect will be explained later.

[0105] Furthermore, when performing the aforementioned insect counting test on diaper 1 four hours after it has been removed from its packaging, it is preferable that the average number of insects attracted to the crotch area 1C four hours later is less than the average number of insects attracted to the front waist area 1F and the back waist area 1B four hours later. Diaper 1 four hours after being removed from its packaging means that four hours have passed since the unopened packaging was opened, diaper 1 was removed from the packaging, and exposed to the outside.

[0106] Regarding the average number of insects attracted after 4 hours, a similar insect counting test as described above was conducted on diapers 1 that had been removed from their packaging and left on a flat surface for 4 hours. Sample 3 was a sample of diapers 1 with repellent AM that had been removed from their packaging for 4 hours worn on model D, and sample 4 had the same construction as sample 3 except that it did not have repellent AM. As mentioned above, each model D was previously dressed in stockings, and a disposable hand warmer was placed on the front (or back) side of each sample.

[0107] Figure 6B shows the results of an insect counting experiment on diaper 1 four hours after it was removed from the packaging. Figure 6 In B, "average number of attracted insects" refers to "the average number of attracted insects after 4 hours." For example... Figure 6 As shown in B, after 4 hours, the average total number of attracted insects in the waist section 1F and 1B of diaper 1 (sample 3) was 0.5, and the average total number of attracted insects in the crotch section 1C after 4 hours was 0.2. Therefore, it is evident that the average number of attracted insects in the crotch section 1C after 4 hours was less than the average number of attracted insects in the front waist section 1F and rear waist section 1B after 4 hours. On the other hand, for sample 4 of diaper 1 without the repellent AM, the average total number of attracted insects in the waist section 1F and 1B (average number of attracted insects after 4 hours) was 2.2, and the average total number of attracted insects in the crotch section 1C (average number of attracted insects after 4 hours) was 3.3. In this way, in diaper 1 containing repellent AM after 4 hours, by making the average number of attracted insects in the crotch 1C after 4 hours less than the average number of attracted insects in the front waist 1F and back waist 1B after 4 hours, the repellent effect around the wearer's legs can be maintained for a long time, while reducing the risk of diaper 1 containing excessive repellent AM.

[0108] Furthermore, regarding the diaper 1 containing repellent AM after 4 hours, examples of means for making the average number of attracted insects in the crotch 1C after 4 hours less than the average number of attracted insects in the anterior lobe 1F and posterior lobe 1B after 4 hours include: the composition, amount, or formulation of repellent AM in the diaper 1; or applying repellent AM in liquid form; or applying repellent AM in microcapsule form containing repellent AM, etc.

[0109] In addition, such as Figure 7 As shown, the diaper 1 in the unfolded and stretched state has the following regions: reference region aa, which is a square with a length of 1 cm in both the longitudinal and width directions; comparison region ba, which is a square with a length of 1 cm in both the longitudinal and width directions; and rear end region Hb. Figure 7 It is a schematic diagram illustrating the reference region aa and the comparison region ab. Figure 7 This is a diagram viewed from the non-skin side, and for convenience, in... Figure 7 Members such as elastic members 23 and 33 are omitted. Furthermore, in the longitudinal direction, the front side is also referred to as one side, and the rear side is also referred to as the other side.

[0110] When viewed in the thickness direction, the reference region aa overlaps with the absorbent core 12 and is located in the longitudinal direction between the central position CL of the diaper 1 and the rear end 12bc of the absorbent core.

[0111] The rear end region Hb is the area extending from one side to the other in the width direction of the back waist portion 30, and its length on one side is 1 cm starting from the longitudinal rear end 30e of the diaper 1. Furthermore, the area extending from one side to the other in the width direction of the back waist portion 30 is the area between the inner ends of the connecting portion 2 in the width direction. Additionally, the 1 cm length on one side starting from the longitudinal rear end 30e of the diaper 1 is the longitudinal length of the rear end region Hb.

[0112] For diaper 1, regardless of the position of the comparison area ba within the posterior region Hb, the basis weight of the repellent AM in the reference area aa is higher than that in the comparison area ba. For example... Figure 7 As shown, for example, even when the comparison region ba is placed at the position of region ba1 in the rear end region Hb, the basis weight of the repellent AM in the reference region aa is higher than that of region ba1. Even when the comparison region ba is placed at the position of region ba2, the basis weight of the repellent AM in the reference region aa is higher than that of region ba2. Even when the comparison region ba is placed at the position of region ba3, the basis weight of the repellent AM in the reference region aa is higher than that of region ba3. Furthermore, the lengths of regions ba1, ba2, and ba3 in the longitudinal direction (the longitudinal length Hb of the rear end region) are 1 cm, and the lengths of regions ba1, ba2, and ba3 in the width direction are 1 cm. Thus, regardless of the position of the comparison region ba in the rear end region Hb, the basis weight of the repellent AM in the reference region aa is higher than that of the repellent AM in the comparison region ba.

[0113] In the diaper 1 of the present invention, regardless of the position of the comparison area ba within the rear end area Hb, by making the basis weight of the repellent AM in the reference area aa higher than that in the comparison area ba, compared to the case where the basis weight of the repellent AM in the rear end area Hb is equal to or greater than that in the reference area aa, the amount of repellent AM used in the diaper 1 can be reduced. In other words, compared to the case where the insect repellent AM is uniformly applied over the entire diaper 1, the risk of overuse of insect repellent can be reduced. Furthermore, since the basis weight of the repellent AM in the wearer's reference area aa is higher than that in the comparison area ba, it is easier to achieve a repellent effect around the wearer's legs (lower body), making it easier to prevent insect bites. In particular, when the wearer is an infant, it is assumed that the upper body will be covered with a shirt or the like, while the lower body will only be covered with the diaper 1. Even in this case, an effective insect repellent effect can be achieved in the wearer's leg area, while reducing the risk of overuse of insect repellent AM.

[0114] Furthermore, as in diaper 1, it is preferable to place the insect repellent AM on the back side of diaper 1, and regardless of the position of the comparison area ba within the rear end area Hb, the basis weight of the repellent AM in the reference area aa is higher than that in the comparison area ba. Generally, people tend to pay less attention to the back side of their body than the ventral side. For example, improving the repellency effect on the wearer's back side can improve the repellency effect on the back side of diaper 1 when sleeping face down.

[0115] The center ac of the reference region aa is located at the center cb12 between the central position CL of the diaper 1 and the rear end 12bc of the absorbent core 12 in the longitudinal direction, and at the central position CC of the diaper 1 in the width direction. Regardless of the position of the comparison region ba in the rear end region Hb, the basis weight of the repellent AM in the reference region aa can be higher than that in the comparison region ba. Even in this case, regardless of the position of the comparison region ba in the rear end region Hb, the basis weight of the repellent AM in the reference region aa is higher than that in the comparison region ba, so that the amount of repellent AM used in the diaper 1 can be reduced compared to the case where the basis weight of the repellent AM in the rear end region Hb is equal to or greater than that in the reference region aa, while allowing for an effective insect repellent effect around the wearer's legs.

[0116] Basis weight (g / m³) of repellent AM in reference region aa 2 The basis weight (g / m³) of the repellent AM in the comparison regions ba (e.g., ba1, ba2, ba3) and the comparison regions ba (e.g., ba1, ba2, ba3) 2The comparison can be performed using a gas chromatograph (7890B or equivalent manufactured by Agilent Technologies).

[0117] (1) First, cut out the reference area aa and comparison area ba (e.g., ba1, ba2, ba3) to be measured from the back waist 30 and absorbent body 10 of the diaper 1. The cut pieces of the reference area aa and comparison area ba are both samples, which are squares of 10 mm × 10 mm in the longitudinal direction × width direction. (2) Next, for example, immerse the sample in water and extract a mixture of repellent AM (a component with insect repellent effect) and other components (solvents, etc.) from the sample. (3) Analyze the components of the mixture extracted from each sample using a gas chromatograph. Then, for each sample, obtain the peak value of repellent AM (a component with insect repellent effect) and the peak value of other components (solvents, etc.), and calculate the ratio of the peak value of the repellent to the peak value of other components (peak value of repellent / peak value of other components). This ratio is considered to correspond to the amount of repellent AM in the sample. (4) Finally, calculate the ratio of repellent in each sample. This ratio is assumed to correspond to the base weight of the repellent AM in the baseline region aa and the comparison region ba. The base weights of the repellents obtained through calculation are then compared.

[0118] Furthermore, for each cut sample, the basis weight of the repellent AM in the reference region aa and the comparison region ba can be calculated and compared as follows: for the components of the separated sample (e.g., the skin side piece 31 and the non-skin side piece 32 of the lower back 30), the amount of repellent AM in each component in the separated state is measured and the amounts are added together.

[0119] Furthermore, as described above, regarding the diaper 1 with repellent AM, the crotch area 1C has an outer sheet (non-skin side sheet) 14 located on the non-skin side and a back sheet (skin side sheet) 13 adjacent to the outer sheet 14 on the skin side (see [link to relevant documentation]). Figure 4 The outer sheet 14 and the back sheet 13 are bonded together using an adhesive such as a hot melt adhesive.

[0120] In addition, such as Figure 8 As shown, the crotch area 1C of the diaper 1 has a front crotch area (one side crotch area) 1Ca and a back crotch area (the other side crotch area) 1Cb. Figure 8 This is a schematic diagram illustrating the area of ​​diaper 1. Figure 8 This is a diagram viewed from the non-skin side, and for convenience, in... Figure 8Components such as elastic members 23 and 33 are omitted. Furthermore, in the longitudinal direction, the front side is also referred to as one side, and the rear side is also referred to as the other side. The front crotch region 1Ca is the region extending from the front end of the crotch 1C in the longitudinal direction to the central position CL of the diaper 1. The rear crotch region 1Cb is the region extending from the rear end of the crotch 1C in the longitudinal direction to the central position CL of the diaper 1.

[0121] Furthermore, the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire front crotch region 1Ca is higher than the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire rear crotch region 1Cb. Simply put, the rear crotch region 1Cb has a portion where the outer sheet 14 and the back sheet 13 are more strongly bonded compared to the front crotch region 1Ca.

[0122] Compared to smooth surfaces, insects such as mosquitoes are more likely to land on uneven surfaces. When the bond between the outer sheet 14 and the back sheet 13 peels off, the peeling creates a space between the outer sheet 14 and the back sheet 13. If the diaper 1 is made to be worn with this space remaining, the outer sheet 14 and the back sheet 13 will rub against each other in the space between them, making it possible for the fibers of either the outer sheet 14 (skin side) or the back sheet 13 (non-skin side) to become abraded. This leads to the risk of unevenness forming on the bonding surface and the uneven surface becoming exposed. In contrast, the higher the maximum peel strength between the outer sheet 14 and the back sheet 13, the stronger the adhesion between the outer sheet 14 and the back sheet 13 becomes. This makes it less likely for a space to form between the outer sheet 14 and the back sheet 13 due to peeling. When worn, this reduces the risk of the outer cover 14 and the back cover 13 rubbing against each other in the space between them, thus reducing the risk of unevenness forming on their surfaces. By reducing the risk of the outer cover 14 and the back cover 13 peeling off, unevenness is less likely to form on the skin-friendly side of the outer cover 14 or the non-skin-friendly side of the back cover 13. This reduces the risk of insects such as mosquitoes landing on the rear crotch area 1C, thereby enabling insect repellency in the rear crotch area 1Cb and reducing the amount of insect repellent used in the diaper 1.

[0123] For example, on the back side (crotch area 1Cb), a repellent effect is achieved due to the peel strength between the outer cover 14 and the back cover 13. Furthermore, the repellent AM is applied to the front side (front waist 20, front crotch area 1Cb), allowing the diaper 1 to provide a repellent effect on both the wearer's abdomen and back, while reducing the risk of overuse of the repellent AM. Compared to the abdomen, since humans are less likely to focus on the back of the body, improving the repellent effect on the wearer's back can effectively prevent insect bites. Additionally, if the wearer is an infant who frequently sleeps in a prone position, insect repellent is necessary on the wearer's back. The repellent effect on the back side (crotch area 1Cb) is achieved due to the peel strength between the outer cover 14 and the back cover 13, and by applying the repellent AM to the back side of the diaper 1 (back waist 30, crotch area 1Cb), effective repellency from the wearer's back becomes easier.

[0124] Furthermore, in this embodiment, the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire rear crotch region 1Cb is higher than the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire front crotch region 1Ca. However, the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire front crotch region 1Ca can be higher than the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire rear crotch region 1Cb.

[0125] In this case, the risk of peeling between the outer cover 14 and the back cover 13 in the crotch area 1Ca can be reduced. This reduces the formation of unevenness on the skin side of the outer cover 14 or the non-skin side of the back cover 13, thus reducing the risk of insects such as mosquitoes landing on the crotch area 1C located on the front side. The amount of insect repellent used in the diaper 1 to exhibit an insect-repelling effect in the crotch area 1Ca can be reduced.

[0126] For example, on the front side (front crotch area 1Ca), a repellent effect is achieved due to the peel strength between the outer cover 14 and the back cover 13. Furthermore, the repellent AM is placed on the back side (back waist 30, back crotch area 1Cb), allowing the diaper 1 to provide a repellent effect on the wearer's abdomen and back, while reducing the risk of overuse of the repellent AM. In addition, in the case of infants who frequently sleep on their backs, insect repellent is needed on the wearer's abdomen. On the front side (front crotch area 1Ca), the repellent effect is achieved due to the peel strength between the outer cover 14 and the back cover 13, and by placing the repellent AM on the front side (front waist 20, front crotch area 1Ca) of the diaper 1, effective repellency from the wearer's abdomen becomes easier.

[0127] "Peel strength" refers to the magnitude of the force required to peel off a bond, and is also the bond strength. The method used to measure the peel strength at each bond can be a known method. For example, first, a front crotch region 1Ca and a back crotch region 1Cb are cut from the diaper 1. Next, the outer cover 14 and back cover 13, which are bonded together, are removed from the cut pieces of the front crotch region 1Ca and the back crotch region 1Cb, preparing a sample. Then, for each sample that has been removed, adhesive tape is applied to both sides of the width end or both sides of the longitudinal end (the surface of the outer cover 14 and the surface of the back cover 13) to form a pair of retainers. Both retainers are clamped in the chuck of a tensile testing machine. Then, the force required to peel off the outer cover 14 and the back cover 13 is measured as follows: the load of the tensile testing machine is set to 0, and the retainer located on the outer cover 14 side is pulled to one side of the thickness direction (non-skin side), and the retainer located on the back cover 13 side is pulled to the other side of the thickness direction (skin side), thereby peeling off the outer cover 14 and the back cover 13 from the sample. The maximum load is read under the following conditions: chuck distance of 10 mm and tensile speed of 100 mm / min. This measurement is performed multiple times (N = 10), and the average of the maximum loads is calculated. The calculated maximum load is converted to load per unit width (N / 25 mm) and used as the magnitude of the peel force (peel strength) for comparison. It is recommended to perform the measurement in a constant environment with stable sample temperature (e.g., temperature 20°C (±2°C), humidity 60% (±5%)). Furthermore, the sample to be measured using a tensile testing machine can be the entire area of ​​the front crotch region 1Ca and the entire area of ​​the rear crotch region 1Cb. Alternatively, both the entire areas of the front crotch region 1Ca and the entire area of ​​the rear crotch region 1Cb can be cut into 25 mm × 25 mm sample pieces, and the peel force of all obtained sample pieces can be measured.

[0128] When the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire front crotch area 1Ca is higher than the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire rear crotch area 1Cb, it is preferable that the maximum basis weight of the repellent AM in the rear crotch area 1Cb is higher than the maximum basis weight of the repellent AM in the front crotch area 1Ca. This reduces the formation of unevenness on the surface of the rear side (rear crotch area 1Cb) of the diaper 1 due to peeling between the outer sheet 14 and the back sheet 13. Therefore, the risk of mosquitoes landing on the crotch area 1C located on the rear side of the diaper 1 is reduced, and combined with the effect of the repellent AM provided in the rear crotch area 1Cb of the diaper 1, the repellency effect on the rear side (rear crotch area 1Cb) of the diaper 1 can be increased, while reducing the risk of overuse of insect repellent. In particular, when sleeping face down, by increasing the repellency effect on the wearer's back in the diaper 1, the repellency effect can be effectively achieved while reducing the amount of repellent AM used.

[0129] Furthermore, when the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire front crotch area 1Ca is higher than the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire rear crotch area 1Cb, it is preferable that the maximum basis weight of the repellent AM in the front crotch area 1Ca is higher than the maximum basis weight of the repellent AM in the rear crotch area 1Cb. This makes it less likely that unevenness will form on the surface of the front side (front crotch area 1Ca) of the diaper 1 due to peeling between the outer sheet 14 and the back sheet 13. Therefore, the risk of mosquitoes landing on the crotch area 1C located on the front side of the diaper 1 is reduced, and combined with the effect of the repellent AM provided in the front crotch area 1Ca of the diaper 1, the repellency effect of the front side (front crotch area 1Ca) of the diaper 1 is increased, while reducing the risk of overuse of insect repellent. In particular, when sleeping on one's back, by increasing the repellency effect on the abdomen of the wearer in the diaper 1, the repellency effect can be effectively manifested while reducing the amount of repellent AM used.

[0130] On the other hand, where the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire front crotch area 1Ca is higher than the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire rear crotch area 1Cb, it is acceptable that the maximum basis weight of the repellent AM in the front crotch area 1Ca is higher than the maximum basis weight of the repellent AM in the rear crotch area 1Cb. This reduces the formation of unevenness on the surface of the back side (rear crotch area 1Cb) of the diaper 1 due to peeling between the outer sheet 14 and the back sheet 13. Therefore, the risk of mosquitoes landing on the crotch area 1C located on the back side of the diaper is reduced, and the repellent AM provided in the front crotch area 1Ca reduces the risk of overuse of the insect repellent AM. At the same time, insect repellent effects are exhibited on both the ventral and dorsal sides of the wearer, which reduces the risk of insect bites.

[0131] Furthermore, where the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire front crotch area 1Ca is higher than the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire rear crotch area 1Cb, it is acceptable that the maximum basis weight of the repellent AM in the rear crotch area 1Cb is higher than the maximum basis weight of the repellent AM in the front crotch area 1Ca. This reduces the formation of unevenness on the surface of the front side (front crotch area 1Ca) of the diaper 1 due to peeling between the outer sheet 14 and the back sheet 13. Therefore, the risk of mosquitoes landing on the crotch area 1C located on the front side of the diaper 1 is reduced, and the repellent AM provided in the rear crotch area 1Cb reduces the risk of overuse of the insect repellent AM. At the same time, insect repellent effects are exhibited on both the ventral and dorsal sides of the wearer, which reduces the risk of insect bites.

[0132] The maximum basis weight of the repellent AM in each region can be measured in a manner similar to the basis weight measurement described above. For example, similar to the method for measuring basis weight described above, the following method can be used: for the front crotch region 1Ca and the rear crotch region 1Cb, cut out square samples with a longitudinal direction × width direction of 10mm × 10mm for all regions, and obtain the maximum basis weight in each region from the basis weight results of all samples.

[0133] like Figure 8 As shown, the crotch region 1C has a central region Cc and side regions Ce. The central region Cc is the central region in the width direction when the crotch region 1C is divided into three equal parts. The side regions Ce are the regions located on either side of the central region. The central region Cc in the front crotch region 1Ca is the front central region Cac, and the side region Ce in the front crotch region 1Ca is the front side region Cae. The central region Cc in the rear crotch region 1Cb is the rear central region Cbc, and the side region Ce in the rear crotch region 1Cb is the rear side region Cbe.

[0134] Preferably, the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire rear side region Cbe is higher than the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire rear central region Cbc. By reducing the risk of peeling between the outer sheet 14 and the back sheet 13 in the rear side region Cbe, the risk of insects such as mosquitoes landing on the rear side region Cbe can be reduced, making it easier to increase the insect repellency effect in the area near the leg opening LH of the diaper 1.

[0135] It is important to note that, similar to the crotch area 1Cb, the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire front side area Cae can be higher than the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire front central area Cac. This reduces the risk of insects such as mosquitoes landing on the front side area Cae, making it easier to increase the insect repellency in the area near the leg opening LH of the diaper 1. Furthermore, both the front crotch area 1Ca and the crotch area 1Cb can have such peel strength.

[0136] On the other hand, the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire rear central region Cbc can be higher than the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire rear side region Cbe. This reduces the risk of the outer sheet 14 and the back sheet 13 completely separating in the rear crotch region 1Cb, resulting in uneven exposure due to the separation of the outer sheet 14 and the back sheet 13 throughout the entire rear crotch region 1Cb. This reduces the risk of mosquitoes and other insects landing on the rear crotch region 1Cb, making it easier to increase the insect repellent effect of the rear crotch region 1Cb.

[0137] Furthermore, similar to the rear crotch region 1Cb, the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire front central region Cac can be higher than the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire front side region Cae. Additionally, both the front crotch region 1Ca and the rear crotch region 1Cb can possess such peel strength.

[0138] Preferably, in the crotch region 1Cb, the maximum basis weight of the repellent AM in the rear side region Cbe is higher than the maximum basis weight of the repellent AM in the rear central region Cbc. Compared to the case where the maximum basis weight of the repellent AM in the rear central region Cbc is set to be higher than the maximum basis weight of the repellent AM in the rear side region Cbe, this makes it easier to increase the insect repellency effect in the area near the leg opening 1 on the rear side of the diaper 1 when worn.

[0139] Furthermore, not only in the rear crotch region 1Cb, but also in the front crotch region 1Ca, the maximum base weight of the repellent AM in the anterior lateral region Cae can be higher than the maximum base weight of the repellent AM in the anterior central region Cac. Additionally, both the front crotch region 1Ca and the rear crotch region 1Cb can have this configuration.

[0140] On the other hand, in the crotch area 1Cb, the maximum basis weight of the repellent AM in the rear central area Cbc can be higher than that in the rear side area Cbe. Since the repellent AM in the rear central area Cbc, which is set in a larger amount than in the rear side area Cbe, can be effective on the leg openings LH on both sides in the width direction, the risk of overuse of the repellent AM in the diaper 1 can be reduced.

[0141] Furthermore, not only in the rear crotch region 1Cb, but also in the front crotch region 1Ca, the maximum base weight of the repellent AM in the anterior central region Cac can be higher than the maximum base weight of the repellent AM in the anterior lateral region Cae. Additionally, both the front crotch region 1Ca and the rear crotch region 1Cb can have this configuration.

[0142] Figure 9 This is a schematic diagram illustrating the area of ​​diaper 1. Figure 9 This is a diagram viewed from the non-skin side, and for convenience, Figure 9 Components such as elastic members 23 and 33 are omitted. Figure 9As shown, the crotch region 1Cb has a first region Cb1 and a second region Cb2. When the crotch region 1Cb is divided into three equal parts in both the longitudinal and width directions, the first region Cb1 is the central region in both the longitudinal and width directions. The second region Cb2 is the region of the crotch region 1Cb that does not include the first region Cb1. In other words, the first region Cb1 is the central region of the crotch region 1Cb, and the second region Cb2 is the region of the crotch region 1Cb that surrounds the first region Cb1.

[0143] Preferably, the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire first region Cb1 can be greater than or equal to the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire second region Cb2. Compared to the case where the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire first region Cb1 is less than the maximum peel strength between the outer sheet 14 and the back sheet 13 in the entire second region Cb2, this reduces the risk of uneven exposure caused by the complete separation of the outer sheet 14 and the back sheet 13 in the crotch region 1Cb due to the separation of the outer sheet 14 and the back sheet 13 throughout the crotch region 1Cb. Therefore, it becomes easier to increase the insect repellency effect in the crotch region 1Cb by making it less likely for insects such as mosquitoes to land on the crotch region 1Cb. Furthermore, the front crotch region 1Ca can have the same structure as the crotch region 1Cb, and both the front crotch region 1Ca and the crotch region 1Cb can have this structure.

[0144] Preferably, the maximum basis weight of the repellent AM in the first region Cb1 is equal to or greater than the maximum basis weight of the repellent AM in the second region Cb2. This allows the repellent AM located in the central part (in the middle) of the first region Cb in the crotch region 1Cb to be effective on the leg openings LH on both sides in the width direction. This reduces the risk of overuse of repellent in the diaper 1.

[0145] As described above, the crotch area 1C has a back panel 13, which is a liquid-impermeable sheet disposed on the non-skin side relative to the absorbent core 12. Furthermore, it is preferable that the repellent AM is disposed at least on the non-skin side relative to the back panel 13. This reduces the risk of the repellent AM disposed on the non-skin side relative to the back panel 13 (liquid-impermeable sheet) becoming soaked into the absorbent core 12, thereby reducing the risk of the repellent AM mixing with excretions such as urine that have been absorbed during wear.

[0146] Even more preferably, the repellent AM is provided on the back sheet 13, which is a liquid-impermeable sheet. This reduces the risk of the repellent AM immersing in the material and makes it easier to keep the repellent AM on the back sheet 13, thus making it easier to maintain the repellent AM's repellent effect.

[0147] If diaper 1 includes an SMS (spunbond / meltblown / spunbond) nonwoven fabric sheet, the repellent AM can be applied to the surface of the SMS nonwoven fabric sheet. The repellent AM placed on the surface of the SMS nonwoven fabric sheet does not penetrate the meltblown layer of the SMS nonwoven fabric, thus making it easier to maintain its position on the surface of the SMS nonwoven fabric sheet and to maintain the repellent effect of the AM.

[0148] When the diaper 1 has an air-impermeable membrane (sheet component), it is preferable that the diaper 1 in its unfolded and stretched state has a portion in which the repellent AM overlaps with the air-impermeable membrane in the thickness direction. Since the repellent AM overlaps with the air-impermeable membrane in the thickness direction, it is easier to restrict the evaporation direction of the volatile components of the repellent AM, making it easier for the repellent AM to exhibit its effect.

[0149] On the other hand, when the diaper 1 has a breathable membrane (sheet component), it is acceptable that the diaper 1 in its unfolded and stretched state has a portion where the repellent AM overlaps with the breathable membrane in the thickness direction. Since the repellent AM overlaps with the breathable membrane in the thickness direction, it is easier for the volatile components of the repellent AM to diffuse over a wide area of ​​the diaper 1.

[0150] The repellent AM of the diaper 1 can be placed in the front waist section 20 or the back waist section 30. The front waist section 20 or the back waist section 30 has an elastic member 23 or 33 along the width direction. When the front waist section 20 or the back waist section 30 has a non-stretchable area where the elastic member 23 or 33 does not stretch, it is preferable that the repellent AM overlaps with the non-stretchable area when viewed along the thickness direction (front-back direction). This reduces the risk that the repellent effect of the repellent AM will be hindered by wrinkles caused by the contraction of the elastic members 23 and 33, thus allowing the repellent AM to effectively exert its repellent effect on external objects.

[0151] Furthermore, preferably, the crotch area 1C of the diaper 1 where the repellent AM is applied has a marking portion M, which indicates the area where the repellent AM is applied. More preferably, when the diaper 1 is viewed in the thickness direction, the portion where the repellent AM is applied overlaps with the marking portion M. This makes it easier for the wearer or others to correctly identify the portion where the repellent AM can provide its repellent effect.

[0152] The marking portion M of the diaper 1 in this embodiment is formed by printing in a color different from the surrounding color (e.g., white) (e.g., green or yellow). Specifically, the marking portion M printed on the back sheet 13 located in the crotch area 1C can be seen from the outside of the diaper 1 through the outer cover sheet 14.

[0153] like Figure 2As shown, the marking section M has the words "AntiMos" or graphic elements indicating that the diaper 1 has an insect-repelling (mosquito-repelling) effect. When the diaper 1 is viewed from the thickness direction, these letters and graphic elements overlap with the area where the repellent AM is located. The wearer or others can easily identify the area where the repellent AM is located.

[0154] However, the marking section AM is not limited to Figure 2 The marking portion illustrated herein can be, for example, a graphic element or a solid color area. Furthermore, the material on which the marking portion AM is printed is not limited to the backing sheet 13, but can be printed on other materials constituting the diaper 1 (such as non-woven fabric sheets). Additionally, the marking portion AM can be formed through a compression portion (embossing) of the diaper 1. Alternatively, the marking portion AM, which is a different color from the surrounding area, can be formed by coloring the waist elastic members 23 and 33 or by coloring the repellent AM itself.

[0155] For diaper 1, it is preferable that the color of the crotch area 1C is less opaque than the colors of the waist areas 1F and 1B. Since insects such as mosquitoes tend to prefer the color of human skin, making the crotch area 1C less opaque than the waist areas 1F and 1B makes it easier to increase the repellency of the crotch area 1C (around the wearer's legs) compared to a case where the crotch area 1C is more transparent than the waist areas 1F and 1B. This allows for a reduction in the amount of repellent AM used in diaper 1.

[0156] For diaper 1, it is preferable that the thermal conductivity of the crotch area 1C is lower than that of the waist areas 1F and 1B. Since insects such as mosquitoes tend to approach objects with temperatures close to human body temperature, increasing the repellency of the crotch area 1C (around the wearer's legs) is easier compared to having a higher thermal conductivity in the crotch area 1C compared to the waist areas 1F and 1B. This allows for a reduction in the amount of repellent AM used in diaper 1.

[0157] Furthermore, in diaper 1, it is preferable that the breathability of the crotch area 1C is lower than that of the waist areas 1F and 1B. Since insects such as mosquitoes tend to prefer carbon dioxide and approach their target, by making the breathability of the crotch area 1C lower than that of the waist areas 1F and 1B, and by making the breathability of the crotch area 1C equal to or greater than that of the waist areas 1F and 1B, the number of insects such as mosquitoes approaching the crotch area 1C (leg opening LH) can be reduced. This allows for a reduction in the amount of repellent AM used in diaper 1.

[0158] Although embodiments of this disclosure have been described above, these embodiments are for the purpose of facilitating understanding of this disclosure only and are not to be construed as limiting this disclosure in any way. Various modifications or variations may be made to this disclosure without departing from its spirit and cover its equivalents.

[0159] [List of reference numerals]

[0160] 1 diaper (underwear-style disposable diaper, disposable diaper), 1F front waistband (one side waistband),

[0161] 1B Lower back (on the other side of the waist), 1C Crotch area,

[0162] 1Ca front crotch area (one side crotch area),

[0163] 1Cb rear crotch area (other side crotch area), 2 joint,

[0164] 10 Absorbent Subjects

[0165] 11. Top sheet, 12. Absorbent core

[0166] 13 Back panel (skin side panel), 14 Outer panel (non-skin side panel), 15 Leg elastic components,

[0167] 16 Leak-proof wall section, 161 Leak-proof wall elastic component, 20 Front waist section,

[0168] 21. Skin side panel, 22. Non-skin side panel, 23. Waist elastic component, 30. Lower back section.

[0169] 31 Skin side sheet, 32 Non-skin side sheet, 33 Waist elastic component, LH Leg opening, BH Waist opening, aa Reference area, ba Comparison area, ba1, ba2, ba3 areas

[0170] Cc central region, Ce lateral region

[0171] Central region posterior to Cbc, lateral region posterior to Cbe, M-marked area

Claims

1. A disposable diaper for infants, which, in its unfolded and stretched states, has intersecting longitudinal, width, and thickness directions. The disposable diaper includes a waist section on one side of the longitudinal direction, a waist section on the other side of the longitudinal direction, and a crotch section. The one side waist portion and the other side waist portion have joint portions at both ends in the width direction for joining the one side waist portion and the other side waist portion. In the longitudinal direction, the area encompassed by the joint is the waist portion on one side and the waist portion on the other side. In the longitudinal direction, the area between the waistline on one side and the waistline on the other side is the crotch area. The disposable diaper contains a volatile insect repellent. The repellent is positioned in the thickness direction at a location overlapping the absorbent core. The repellent is located in the longitudinal direction between the rear waist portion, which is the other side of the waist, and the center line of the disposable diaper in the longitudinal direction, and is in the central region when the crotch is divided into three equal parts in the width direction. The repellent agent is not disposed in a position overlapping with one side of the waist or the other side of the waist in the longitudinal direction. The maximum base weight of the repellent in the central region is higher than the maximum base weight of the repellent in the side regions located on both sides of the central region in the width direction. When an insect counting experiment was conducted using adult female Aedes aegypti mosquitoes within 20 minutes of removing the disposable diaper from its packaging, The average number of insects attracted to the crotch area less than The average number of attracted insects on one side of the waist and the other side of the waist.

2. The disposable diaper according to claim 1, wherein, When an insect counting experiment was conducted using adult female Aedes aegypti mosquitoes to attract the disposable diapers 4 hours after they were removed from the packaging, The average number of attracted insects in the groin area after 4 hours less than The average number of attracted insects on one side of the waist and the other side of the waist after 4 hours.

3. The disposable diaper according to claim 1 or 2, wherein, The crotch area has a crotch region on one side and a crotch region on the other side. The crotch area is the region extending in the longitudinal direction from one end of the crotch to the center of the disposable diaper. The other side crotch area is the region extending in the longitudinal direction from the other end of the crotch to the center of the disposable diaper. The other side of the crotch area has a first area and a second area. When the other side crotch area is divided into three equal parts in the longitudinal direction and the width direction, the first area is the central area in the longitudinal direction and the central area in the width direction. The second region is the area of ​​the other side crotch region excluding the first region, and Maximum base weight of the repellent in the first region equal to or greater than The maximum base weight of the repellent in the second region.

4. The disposable diaper according to claim 1 or 2, wherein, The crotch area has Absorbent core, and A liquid-impermeable sheet, disposed on the non-skin side relative to the absorbent core, and The repellent is disposed at least on the non-skin side relative to the liquid-impermeable sheet.

5. The disposable diaper according to claim 1 or 2, wherein, The crotch area has a marking portion that indicates the area where the repellent is applied, and When viewed in the thickness direction, the disposable diaper has a portion where the repellent is disposed that overlaps with the marking portion.

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