Disposable diapers

Abstract

To provide a disposable diaper that effectively exhibits insect repelling effect on the periphery of legs of a wearer while reducing the risk of excessive use of an insect repellent.SOLUTION: A disposable diaper (1) has a longitudinal direction, a width direction, and a thickness direction that intersect each other in an unfolded and stretched state, and comprises a one-side waist part formed on one side of the longitudinal direction, an other-side waist part formed on the other side of the longitudinal direction, and a crotch part. The disposable diaper is provided with an insect repellent (AM) so that, in a test on the number of insects attracted to the disposable diaper (1) within 20 minutes after it is taken out of a package, the average number of insects fixed to the crotch part is less than the average number of insects fixed to the one-side waist part and the other-side waist part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a disposable diaper. [Background technology]

[0002] Disposable absorbent articles that absorb excrement such as feces and urine have been known in the past. Patent Document 1 discloses a disposable absorbent article that includes insect-repellent microcapsules produced by microencapsulating a substance that exhibits insect-repellent properties, and it is known that the intrusion of pests into the absorbent article during distribution and storage is effectively prevented. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2012-522618 Summary of the Invention [Problem to be solved by the invention]

[0004] The insect repellent effect of absorbent articles is also required while they are being worn. In particular, disposable diapers are worn by infants, young children, the elderly, and others, who tend to be more susceptible to insect bites on their legs (especially the thighs and shins) than on their faces. Therefore, the insect repellent effect of absorbent articles is also required while they are being worn. However, the more substances that exhibit insect repellent effect that are contained in the absorbent article, the greater the insect repellent effect of the absorbent article, but there is a risk that the manufacturing costs of the absorbent article will increase.

[0005] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to effectively repel insects around the wearer's legs while reducing the risk of excessive use of insect repellents in disposable diapers. [Means for solving the problem]

[0006] The main invention to achieve the above object is: In a deployed and stretched state, the sheet has a longitudinal direction, a width direction, and a thickness direction that intersect with each other, A disposable diaper for babies, comprising a one-side waistband portion provided on one side in the longitudinal direction, a second-side waistband portion provided on the other side in the longitudinal direction, and a crotch portion, the one-side waistline portion and the other-side waistline portion have joints at both ends in the width direction for joining the one-side waistline portion and the other-side waistline portion, In the longitudinal direction, an area in which the joint is located corresponds to the one-side waistline portion and the other-side waistline portion, In the longitudinal direction, a region between the one-side waistline portion and the other-side waistline portion is the crotch portion, It is equipped with a volatile insect repellent, the repellent is provided at a position overlapping the absorbent core in the thickness direction, The repellent is disposed between the back waist portion as the other waist portion and the center line of the disposable diaper in the longitudinal direction. and is provided in a central region when the crotch portion is divided into three equal parts in the width direction, the repellent is not provided at a position overlapping the one-side waistline portion in the longitudinal direction, and is not provided at a position overlapping the other-side waistline portion, an extension portion extending to one side is provided on one side of the joint portion in the longitudinal direction of the back-side waistband portion, and the repellent is provided on the one side of the extension portion; the maximum value of the basis weight of the repellent in the central region is higher than the maximum value of the basis weight of the repellent in side regions located on both outer sides of the central region in the width direction, In a test to measure the number of attracted insects using female adult Aedes aegypti mosquitoes for the disposable diapers 20 minutes after removal from the package, The average number of insects fixed in the crotch area is is less than the total average number of settled insects in the one-side waist circumference portion and the other-side waist circumference portion The present invention relates to a disposable diaper for infants. Other features of the present invention will become apparent from the description of this specification and the accompanying drawings. [Effects of the Invention]

[0007] According to the present invention, there is provided a disposable diaper that can effectively exert an insect repellent effect around the legs of a wearer while reducing the risk of excessive use of insect repellent. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic perspective view of a pants-type disposable diaper 1. FIG. [Figure 2] FIG. 2 is a view of the diaper 1 in a stored state as seen from the back side. [Figure 3] 1 is a schematic plan view of a diaper 1 in an unfolded and stretched state, as viewed from the skin side. [Figure 4] FIG. 3 is a schematic cross-sectional view taken along the center line CC in FIG. 2. [Figure 5] FIG. 1 is a diagram illustrating a test for the number of attracted insects. [Figure 6] Figure 6A shows the results of an insect-attraction test for diaper 1 within 20 minutes after removal from the package, and Figure 6B shows the results of an insect-attraction test for diaper 1 four hours after removal from the package. [Figure 7] FIG. 2 is a diagram illustrating a reference area aa and a comparison area ab. [Figure 8] FIG. 2 is a diagram illustrating each area of ​​the diaper 1. [Figure 9] FIG. 2 is a diagram illustrating each area of ​​the diaper 1. DETAILED DESCRIPTION OF THE INVENTION

[0009] At least the following matters will become clear from the description of this specification and the accompanying drawings. (Aspect 1) This disposable diaper has, in an unfolded and stretched state, longitudinal, width, and thickness directions that intersect with one another, and is equipped with a one-side waistband portion on one side of the longitudinal direction, a second-side waistband portion on the other side of the longitudinal direction, and a crotch portion, and is equipped with an insect repellent, and is characterized in that, in a test to count the number of insects attracted to the disposable diaper within 20 minutes after removal from the package, the average number of insects that have settled in the crotch portion is less than the average number of insects that have settled in the one-side waistband portion and the second-side waistband portion.

[0010] According to the disposable diaper of aspect 1, it is possible to effectively exert a repellent effect around the legs of the wearer while reducing the risk of excessive use of insect repellent.

[0011] (Aspect 2) A disposable diaper according to aspect 1, wherein in the insect attraction test of the disposable diaper four hours after removal from the package, the average number of insects resident in the crotch area after four hours is less than the average number of insects resident in the one-side waist area and the other-side waist area after four hours.

[0012] According to the disposable diaper of aspect 2, it is possible to reduce the risk of using an excessive amount of insect repellent, while still effectively exerting a repellent effect around the legs of the wearer for a long period of time.

[0013] (Aspect 3) A disposable diaper having a longitudinal direction, a width direction, and a thickness direction that intersect with one another in an unfolded and stretched state, comprising a first waist portion provided on one side in the longitudinal direction, a second waist portion provided on the other side in the longitudinal direction, and an absorbent core, wherein an insect repellent is provided, and the diaper has a square reference region having a length of 1 cm in the longitudinal direction and the width direction, a square comparison region having a length of 1 cm in the longitudinal direction and the width direction, and a second end region, wherein the reference region overlaps with the absorbent core when viewed in the thickness direction, and the first waist portion is provided on the other side in the longitudinal direction. This disposable diaper is characterized in that the comparison area is located between the center of the disposable diaper and the other end of the absorbent core in the hand direction, the other end area is a region from one side end to the other side end of the other waist portion in the width direction, and has a length of 1 cm from the other end of the disposable diaper to one side, and regardless of the position of the comparison area in the other end area, the basis weight of the repellent in the reference area is higher than the basis weight of the repellent in the comparison area.

[0014] According to the disposable diaper of aspect 3, it is possible to effectively exert an insect repellent effect around the legs of the wearer while reducing the risk of excessive use of insect repellent.

[0015] (Aspect 4) A disposable diaper according to aspect 3, wherein the center of the reference area is located midway between the center position of the disposable diaper and the other end position of the absorbent core in the longitudinal direction, and is located at the center of the disposable diaper in the width direction, and regardless of the position of the comparison area in the other end region, the basis weight of the repellent in the reference area is higher than the basis weight of the repellent in the comparison area.

[0016] According to the disposable diaper of aspect 4, it is possible to effectively exert an insect repellent effect around the legs of the wearer while reducing the risk of using an excessive amount of insect repellent.

[0017] (Aspect 5) A disposable diaper having a longitudinal direction, a width direction, and a thickness direction that intersect with one another in an unfolded and stretched state, the disposable diaper comprising a first waistband portion provided on one side in the longitudinal direction, a second waistband portion provided on the other side in the longitudinal direction, and a crotch portion, the disposable diaper being provided with an insect repellent; the crotch portion having a non-skin-side sheet portion located closest to the skin and a skin-side sheet portion adjacent to the non-skin-side sheet portion from the skin side, the non-skin-side sheet portion and the skin-side sheet portion being joined with an adhesive; and the crotch portion comprising a first crotch region and a second crotch region. The disposable diaper is characterized in that the one-side crotch region is the region in the longitudinal direction from the end of one side of the crotch portion to the center position of the disposable diaper, and the other-side crotch region is the region in the longitudinal direction from the end of the other side of the crotch portion to the center position of the disposable diaper, and the maximum value of the peel strength between the non-skin-side sheet portion and the skin-side sheet portion in the entire other-side crotch region is higher than the maximum value of the peel strength between the non-skin-side sheet portion and the skin-side sheet portion in the entire one-side crotch region.

[0018] The higher the maximum peel strength between the non-skin-side sheet portion and the skin-side sheet portion, the stronger the bond between them and the less likely it is that a gap will form between them due to peeling, thereby reducing the risk of the sheets rubbing against each other in the gap between the non-skin-side sheet portion and the skin-side sheet portion when worn, thereby reducing the risk of irregularities being formed on the surfaces of the sheets.The disposable diaper of aspect 5 reduces the risk of irregularities being formed on the surface due to peeling between the non-skin-side sheet portion and the skin-side sheet portion, thereby reducing the risk of insects such as mosquitoes landing in the other crotch area, thereby providing insect repellent effect in the other crotch area and reducing the amount of insect repellent used in the disposable diaper.

[0019] (Aspect 6) Aspect 6 is a disposable diaper according to aspect 5, wherein the maximum value of the basis weight of the repellent in the one crotch region is higher than the maximum value of the basis weight of the repellent in the other crotch region.

[0020] According to the disposable diaper of aspect 6, the formation of unevenness on the surface due to peeling between the non-skin-side sheet portion and the skin-side sheet portion is reduced, thereby reducing the risk of insects such as mosquitoes landing in the crotch area on one side of the waistband.This, combined with the effect of the repellent provided in the crotch area on one side, reduces the risk of using excessive insect repellent while increasing the insect repellent effect on one side of the diaper.

[0021] (Aspect 7) Aspect 6 is a disposable diaper according to aspect 5, wherein the maximum value of the basis weight of the repellent in the one crotch region is higher than the maximum value of the basis weight of the repellent in the other crotch region.

[0022] According to the disposable diaper of aspect 7, the formation of unevenness on the surface due to peeling between the non-skin-side sheet portion and the skin-side sheet portion can be reduced, thereby reducing the risk of insects such as mosquitoes landing in the crotch area on the other waistband side, and the repellent provided in the crotch area on one side reduces the risk of using excessive insect repellent, while providing an insect repellent effect on both the ventral and dorsal sides of the wearer, thereby reducing the risk of insect bites.

[0023] (Aspect 8) Aspect 8 is a disposable diaper according to any one of aspects 1 to 7, wherein the other-side waist portion is a back-side waist portion.

[0024] According to the disposable diaper of aspect 8, since the human body is less likely to pay attention to the back side than the ventral side, it is possible to improve the repellent effect on the back side of the wearer, and to improve the repellent effect on the back side of the wearer when sleeping face down.

[0025] (Aspect 9) A disposable diaper according to any one of aspects 5 to 8, wherein the crotch portion has a central region and side regions, the central region being the central region in the width direction when the crotch portion is divided into three equal parts in the width direction, and the side regions being regions located on both sides of the central region, and in at least one of the one-side crotch region or the other-side crotch region, the maximum value of the peel strength between the non-skin-side sheet portion and the skin-side sheet portion across the entire side region is higher than the maximum value of the peel strength between the non-skin-side sheet portion and the skin-side sheet portion across the entire central region.

[0026] According to the disposable diaper of aspect 9, by reducing peeling between the non-skin-side sheet portion and the skin-side sheet portion in the side regions, the risk of insects such as mosquitoes landing on the side regions is reduced, which makes it easier to enhance the repellent effect in the areas near the leg openings of the disposable diaper.

[0027] (Aspect 10) A disposable diaper according to any one of aspects 5 to 8, wherein the crotch portion has a central region and side regions, the central region being the central region in the width direction when the crotch portion is divided into three equal parts in the width direction, and the side regions being regions located on both sides of the central region, and in at least one of the one-side crotch region or the other-side crotch region, the maximum value of the peel strength between the non-skin-side sheet portion and the skin-side sheet portion throughout the entire central region is higher than the maximum value of the peel strength between the non-skin-side sheet portion and the skin-side sheet portion throughout the entire side region.

[0028] According to the disposable diaper of aspect 10, the risk of the non-skin-side sheet portion and the skin-side sheet portion completely peeling off in the crotch area, exposing the unevenness of the non-skin-side sheet portion and the skin-side sheet portion throughout the entire crotch area, is reduced, thereby reducing the risk of mosquitoes and other insects landing in the crotch area and making it easier to increase the repellent effect of the crotch area.

[0029] (Aspect 11) 11. The disposable diaper according to any one of aspects 1 to 10, further comprising a crotch portion, the crotch portion having a central region and side regions, the central region being a central region in the width direction when the crotch portion is divided into thirds equal in the width direction, the side regions being regions located on both sides of the central region, the crotch portion comprising one crotch region and an other crotch region, the one crotch region being a region from the one end of the crotch portion to a central position of the disposable diaper in the longitudinal direction, and the other crotch region being a region from the other end of the crotch portion to a central position of the disposable diaper in the longitudinal direction, and the maximum basis weight of the repellent in the side regions being higher than the maximum basis weight of the repellent in the central region in at least one of the one crotch region or the other crotch region.

[0030] According to the disposable diaper of aspect 11, the repellent effect in the areas near the leg openings of the disposable diaper when worn is more likely to be enhanced than when the basis weight of the repellent in the central region is higher than the basis weight of the repellent in the side regions.

[0031] (Aspect 12) A disposable diaper according to any one of aspects 1 to 10, comprising a crotch portion, the crotch portion having a central region and side regions, the central region being the central region in the width direction when the crotch portion is divided into three equal parts in the width direction, the side regions being regions located on both sides of the central region, and the maximum basis weight of the repellent in the central region being higher than the maximum basis weight of the repellent in the side regions.

[0032] According to the disposable diaper of aspect 12, the repellent provided in the central region can exert its effect toward the leg openings on both sides in the width direction, thereby reducing the risk of using excessive repellent.

[0033] (Aspect 13) A disposable diaper according to any one of aspects 5 to 7, wherein the other-side crotch region has a first region and a second region, the first region being a region in the center of the longitudinal direction and the center of the width direction when the other-side crotch region is divided into thirds in the longitudinal direction and the width direction, and the second region being a region of the other-side crotch region excluding the first region, and the maximum value of the peel strength between the non-skin-side sheet portion and the skin-side sheet portion throughout the first region is equal to or greater than the maximum value of the peel strength between the non-skin-side sheet portion and the skin-side sheet portion throughout the second region.

[0034] According to the disposable diaper of aspect 13, the risk of the non-skin-side sheet portion and the skin-side sheet portion completely peeling off in the other crotch region, exposing the unevenness of the non-skin-side sheet portion and the skin-side sheet portion throughout the entire other crotch region, is reduced, thereby reducing the risk of mosquitoes and other insects landing in the crotch area on one side of the disposable diaper and making it easier to increase the repellent effect of the crotch area.

[0035] (Aspect 14) 14. The disposable diaper according to any one of aspects 1 to 13, further comprising a crotch portion, the crotch portion comprising a first crotch region and an other crotch region, the first crotch region being a region in the longitudinal direction from the one end of the crotch portion to a central position of the disposable diaper, the other crotch region being a region in the longitudinal direction from the other end of the crotch portion to a central position of the disposable diaper, the other crotch region comprising a first region and a second region, the first region being a region in the longitudinal center and the width center when the other crotch region is divided into thirds in the longitudinal direction and the width direction, and the second region being a region of the other crotch region 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.

[0036] According to the disposable diaper of aspect 14, the repellent provided in the first region can exert its effect toward the leg openings on both sides in the width direction, thereby reducing the risk of using excessive repellent.

[0037] (Aspect 15) A disposable diaper according to any one of aspects 1 to 14, comprising a crotch portion, the crotch portion having an absorbent core and a liquid-impermeable sheet provided on the non-skin side of the absorbent core, and the repellent is provided at least on the non-skin side of the liquid-impermeable sheet.

[0038] According to the disposable diaper of the fifteenth aspect, the risk of the repellent provided on the non-skin side of the liquid-impermeable sheet permeating into the absorbent core can be reduced.

[0039] (Aspect 16) A disposable diaper according to any one of aspects 1 to 15, comprising a crotch portion, the repellent being provided in the crotch portion, the crotch portion having a marker portion indicating the area where the repellent is provided, and a portion where the portion where the repellent is provided and the marker portion overlap when viewed in the thickness direction.

[0040] According to the disposable diaper of aspect 16, it becomes easier for the wearer to recognize the areas where the repellent effect of the repellent is exerted.

[0041] === Implementation form === As an example of the disposable diaper according to this embodiment, a pants-type disposable diaper for infants will be described. However, the disposable diaper according to this embodiment is not limited to this and can also be used as a pants-type disposable diaper for adults or a tape-type disposable diaper for infants or adults.

[0042] ===Basic configuration of pants-type disposable diaper 1=== FIG. 1 is a schematic perspective view of a pants-type disposable diaper 1 (hereinafter also referred to as "diaper 1"). FIG. 2 is a view of the diaper 1 in a stored state as seen from the back side. FIG. 3 is a schematic plan view of the diaper 1 in an unfolded and stretched state as seen from the skin side. FIG. 4 is a schematic cross-sectional view taken along the center line CC in FIG. 3. The center line CC shown in FIG. 3 etc. indicates the center (central position) of the diaper 1 in the width direction, and the center line CL indicates the center (central position) of the diaper 1 in the longitudinal direction.

[0043] The unfolded state of the diaper 1 refers to the state in which the pair of seams 2 on both sides of the pants-type diaper 1 are separated and the diaper 1 is opened and unfolded in a flat plane. The stretched state of the diaper 1 refers to the state in which the elastic members of the diaper 1 are stretched to the extent that wrinkles in the diaper 1 are no longer visible. Specifically, this refers to the state in which the dimensions of each member constituting the diaper 1 are stretched to the extent that they match or are close to the dimensions of the member alone (i.e., the dimensions when the elastic members are not stretchable).

[0044] The pants-type diaper 1 has a vertical direction, a width direction, and a front-to-rear direction, and is formed with a waist opening BH and a pair of leg openings LH (see Fig. 2). In the front-to-rear direction, the side facing the wearer's abdomen is referred to as the front side, and the side facing the wearer's back is referred to as the rear side. The diaper 1 also has a thickness direction, as shown in Fig. 4, and the side that comes into contact with the wearer in the thickness direction is referred to as the skin side, and the opposite side is referred to as the non-skin side.

[0045] The diaper 1 has an absorbent main body 10 and waist-surrounding sections 20, 30 arranged on the non-skin side of the absorbent main body 10. The diaper 1 of this embodiment is a so-called three-piece type, and the waist-surrounding section has a ventral waist-surrounding section 20 and a dorsal waist-surrounding section 30, and the non-skin side of the absorbent main body 10 below the ventral waist-surrounding section 20 and the dorsal waist-surrounding section 30 is exposed to the outside.

[0046] 3 and 4, the non-skin-side surface of the longitudinal ventral end of the absorbent main body 10 is joined to the skin-side surface of the ventral waistline section 20 with an adhesive or the like, and the non-skin-side surface of the longitudinal rear end of the absorbent main body 10 is joined to the skin-side surface of the back waistline section 30 with an adhesive or the like. From the unfolded state of the diaper 1 shown in FIG. 3, the absorbent main body 10 is folded in half at the fold F so that the ventral waistline section 20 and the back waistline section 30 face each other, and both widthwise ends of the ventral waistline section 20 and both widthwise ends of the back waistline section 30 are joined by welding (for example, thermal welding or ultrasonic welding) or the like to form a pair of joining sections 2, thereby turning the diaper 1 into a pants-type diaper. The fold F is located in the longitudinal center of the diaper 1 in the unfolded state.

[0047] In this embodiment, the regions of the diaper 1 in the vertical range where the seam 2 is located are referred to as the "ventral waistline 1F" and the "dorsal waistline 1B," and the region below the ventral waistline 1F and the dorsal waistline 1B is referred to as the "crotch region 1C." The "crotch region" refers to the region located below the crotch of the wearer when worn. Specifically, in the case of a pants-type disposable diaper such as the diaper 1, the crotch region 1C refers to the region below the seam 2 at both widthwise ends when the diaper is in the pants-type state. In the case of a tape-type disposable diaper, the crotch region refers to the lowest region when the disposable diaper is folded in half at the longitudinal center fold and the disposable diaper is divided into two equal parts in the longitudinal direction.

[0048] The absorbent body 10 comprises a liquid-permeable top sheet 11, an absorbent core 12 that absorbs bodily waste, a liquid-impermeable back sheet 13, and an exterior sheet 14, all of which are bonded together with an adhesive or the like. An example of the absorbent core 12 is a liquid-absorbent fiber such as pulp fiber that is impregnated with a superabsorbent polymer and molded into a predetermined shape. The absorbent core 12 may be covered with a core wrap sheet such as liquid-permeable tissue paper or nonwoven fabric. Other examples of the absorbent core 12 include an SAP sheet in which an SAP layer is attached to a hydrophilic sheet, and an airlaid sheet in which liquid-absorbent fiber is molded into a sheet by an airlaid method.

[0049] The absorbent body 10 also has leg elastic members 15 (for example, rubber threads) on both widthwise sides thereof that are stretchable in the longitudinal direction (vertical direction), allowing the diaper 1 to fit snugly around the legs of the wearer.

[0050] The absorbent body 10 also has leakage preventing walls 16 that can stand up on the skin side on both widthwise sides. For example, the leakage preventing walls 16 are formed by folding both widthwise sides of the exterior sheet 14 inward in the widthwise direction so that they are positioned on the skin-side surface of the top sheet 11, and providing the folded-back portions with leakage preventing wall elastic members 161 (e.g., rubber threads) that stretch in the longitudinal direction.

[0051] As shown in Fig. 4, the ventral waistband portion 20 and the back waistband portion 30 each have a skin-side sheet 21, 31 and a non-skin-side sheet 22, 32 made of a soft nonwoven fabric or the like, and a plurality of waistband elastic members 23, 33 (e.g., rubber thread) that stretch in the width direction. The plurality of waistband elastic members 23, 33 are arranged in the waistband portions 20, 30 at intervals in the vertical direction and are fixed to the sheets in a stretched state in the width direction. Therefore, the ventral waistband portion 20 and the back waistband portion 30 are stretchable in the width direction to fit the waist of the wearer.

[0052] The ventral waistline portion 20 may have a printed sheet 24 (e.g., a resin film such as polyethylene or polypropylene) between the skin-side sheet 21 and the non-skin-side sheet 22. Although not shown, the back-side waistline portion 30 may also have a printed sheet between the skin-side sheet 31 and the non-skin-side sheet 32.

[0053] 3, the ventral waistline portion 20 has a rectangular shape. On the other hand, the back waistline portion 30 has an extension portion 34 extending downward from the rectangular joint portion 2. The extension portion 34 has a generally trapezoidal shape with its width direction shortening downward.

[0054] Although the basic structure of the diaper 1 has been described above, the structure of the diaper 1 is not limited to the above. For example, the diaper 1 may be a two-piece type diaper, in which the ventral waistband 20 and the dorsal waistband 30 are formed from a single continuous member, or a waistband in the crotch area may be provided connecting the ventral waistband 20 and the dorsal waistband 30. Furthermore, the waistband elastic members 23, 33 and the leg elastic members 15 may be sheet-like elastic members (stretchable films or stretchable nonwoven fabrics) instead of rubber thread.

[0055] <<Insect Repellent AM>> The diaper 1 is provided with an insect repellent AM. The insect repellent AM (hereinafter also referred to as "repellent AM") is a repellent (insect repellent) for pests such as mosquitoes, gnats, midges, and flies, and is a synthetic compound or natural plant extract containing an ingredient with insect repellent properties. Examples of suitable repellents include lemongrass, citronellal, 1,8-cineole, linalyl acetate, DEET (N,N-diethyl-3-methylbenzamide), sesquiterpenes, ethyl butylacetylaminopropionate, picaridin, pyrethroids, cinnamon, rosemary, lavender, peppermint, eucalyptus, citronella, lemon eucalyptus, and tulsi. The repellent AM can be selected depending on the target pests and the intended wearer. In this embodiment, an isolated fragrance extracted from citronella grass is used. This provides the diaper 1 with an ingredient (citronella grass) with insect repellent properties. Alternatively, the repellent AM may be prepared using an isolated fragrance extracted from a repellent component such as lemongrass.

[0056] The repellent AM is preferably an allergen-free substance. For example, it is preferable that the repellent AM is substantially free of the 26 substances that are required to be labeled as allergens under the EU (European Union) Cosmetics Directive (76 / 768 / EEC) (i.e., the proportion of allergens in the repellent AM is 1% or less). Furthermore, it is preferable that the repellent AM does not impair the adhesive performance of the hot melt adhesive used in the diaper 1.

[0057] The repellent AM in Figure 2 and other figures is also a repellent placement area AM that indicates the area where the repellent AM is applied. The insect repellent AM in this embodiment is a volatile substance and is applied in liquid form. The repellent placement area AM may be applied with only a synthetic compound or natural plant extract containing an ingredient with insect repellent effect, or may be applied with a liquid in which a solvent or the like is added to an ingredient (substance) with insect repellent effect as appropriate.

[0058] In the present embodiment, the repellent AM is applied to the diaper 1 in a liquid form, but this is not limiting. The insect repellent AM may be in a solid form, or may be in a form in which the repellent is encapsulated in microcapsules or the like.

[0059] 2 and other figures, in this embodiment, an insect repellent AM is provided on the back side of the diaper 1. Specifically, the repellent AM is provided on the back side of the diaper 1, below the back waistband 30 (toward the folded portion F) and above the folded portion F (center line CL), approximately in the center in the width direction. This makes it easier for the repellent AM to exert its repellent effect around the wearer's legs, reducing the risk of mosquito bites on the wearer's legs.

[0060] It is preferable that the repellent AM is provided in a position overlapping the absorbent core 12 in the thickness direction of the diaper 1 in an unfolded and stretched state. 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 this area where the repellent AM is provided can be changed as desired. For example, it may 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 may be any other shape such as a circle, ellipse, polygon, etc. As a result, even if the repellent AM volatilizes, the material constituting the absorbent core absorbs the repellent AM, allowing the repellent AM to be maintained for a long period of time in the diaper 1. In particular, when the absorbent core 12 comprises liquid-absorbent fibers such as pulp fibers and a superabsorbent polymer (SAP), the material with a porous surface can easily absorb the volatilized repellent AM.

[0061] <About the repellent effect of Diaper 1>> Absorbent articles such as disposable diapers equipped with insect repellents have been known for some time. The more insect repellent a disposable diaper contains, the greater the repellent effect, but the more insect repellent a disposable diaper contains, the higher the manufacturing costs. It is also known that, while wearing a diaper 1, a wearer is more likely to be bitten by insects on the lower half of their body, such as their legs (particularly their thighs and shins), than on the upper half of their body, such as their face (ventral side). While wearing a diaper 1, the upper half of the body is easily visible and reachable by the wearer, but the lower half of the body is difficult for the wearer to see and reach. For this reason, a diaper 1 that has insect repellent effects around the legs is required.

[0062] The diaper 1 of this embodiment contains an insect repellent AM. An insect attraction test was conducted on the diaper 1 within 20 minutes of removal from the package, and the results showed that the average number of settled insects in the crotch region 1C was less than the average number of settled insects in the ventral waist region 1F and the back waist region 1B. The "insect attraction test" is a test to measure the number of insects attracted to the diaper 1. By providing a diaper 1 in which the average number of settled insects in the crotch region 1C is less than the average number of settled insects in the ventral waist region 1F and the back waist region 1B, the insect repellent AM can be effectively used around the wearer's legs while reducing the risk of excessive use of the insect repellent AM compared to a case in which the average number of settled insects in the crotch region 1C is equal to or greater than the average number of settled insects in the ventral waist region 1F and the back waist region 1B. The package refers to a container in which the diaper 1 is housed in a container. Generally, the diaper 1 is distributed and stored in the packaged state. The diaper 1 within 20 minutes of being removed from the package means that the diaper 1 is removed within 20 minutes of being removed from the unopened package.

[0063] The test for the number of attracted insects is measured by the following method. Figure 5 is a diagram for explaining the test for the number of attracted insects. Figure 5 is a schematic diagram of the test method, and the insects are omitted. First, prepare a sample in which model D is wearing stockings and a diaper is worn over the stockings. The samples prepared were Sample 1, in which a diaper 1 containing repellent AM was worn by a model D within 20 minutes of being removed from the package, and Sample 2, in which a diaper without repellent AM was worn by a model D. Sample 2 was the same as Sample 1 except that it did not contain repellent AM. A disposable hand warmer was placed on the ventral (or dorsal) side of each sample. By placing the disposable hand warmer inside, the sample was brought to a temperature close to body temperature, increasing its attractiveness to insects. Model D is a balloon shaped to resemble the body shape (waist and leg circumference) of an infant. Model D's waist circumference is 47 cm and its leg circumference is 25 cm. The balloon material for Model D is polyethylene. The stockings worn by Model D are made of nylon and polyurethane. When each sample was worn by the model D, the waist portions 20, 30 were stretched by 180% and the leg openings LH were stretched by 250%. Then, as shown in Figure 5, each sample is placed in a 50 cm x 50 cm x 50 cm cubic box (box) B, and the sample is hung on the top of box B with a string LO or the like. Box B can be, for example, a nylon box that is breathable and highly visible and is covered with cloth. Box B contains 50 insects. The insects are adult female Aedes aegypti mosquitoes. The temperature inside box B is 25°C, and the humidity is 50-70%. Then, the number of insects attached to each of the waist regions 1F and 1B and the crotch region 1C of the sample is measured according to the time that has passed since the sample was placed in Box B. Specifically, the number of insects attached to the measurement area of ​​the sample is measured 5 minutes, 10 minutes, 20 minutes, 30 minutes, 60 minutes, and 120 minutes after the sample was placed in Box B. The average value is calculated from the number of insects attached to each of the waist regions 1F and 1B and the crotch region 1C over the elapsed time.

[0064] The insect-attracted number test may be conducted using a model using multiple cylinders instead of a balloon shaped to resemble an infant's body. For example, the insect-attracted number test may be conducted using two cylindrical cylinders, or three cylindrical cylinders. When conducting the insect-attracted number test using two cylindrical cylinders, a urethane cylinder is inserted from the waist opening BH of the diaper 1 toward each leg opening LH, and the sample is placed in a box B similar to that described above, with the cylinders perpendicular to the ground. The number of insects attached to the measurement area of ​​the sample at each elapsed time is counted, and an average value is calculated from the number of insects attached to the waist openings 1F and 1B and the crotch opening 1C at each elapsed time. When conducting an insect attraction number test using three cylindrical tubes, a urethane tube is inserted from the waist opening BH of the diaper 1 toward each leg opening LH, the tubes are stood perpendicular to the ground, and a tube with a larger diameter than the tube inserted into the leg opening LH is inserted into the waist opening BH.The sample is then placed in box B similar to that described above, and the number of insects that have attached to the measurement area of ​​the sample at each elapsed time is measured, and an average value can be calculated from the number of insects that have attached to each of the waist openings 1F, 1B and the crotch area 1C at each elapsed time.

[0065] Figure 6A shows the results of the insect attraction test for diaper 1 within 20 minutes after removal from the package. The average number of attracted insects at each measurement time for each measurement area shown in Figures 6A and 6B (described below) is the average of six (n) measurements. In Figures 6A and 6B, "total waist area" refers to the sum of the results for the ventral waist area 1F and the dorsal waist area 1B, and "total crotch area" refers to the sum of the results for the ventral crotch area (ventral crotch area 1Ca) and the dorsal crotch area (dorsal crotch area 1Cb). The average number of attracted insects at each elapsed time was then calculated to obtain the average number of settled insects. For example, in the waist area of ​​diaper 1 (ventral waist area and dorsal waist area), the sum of the average number of attracted insects at each elapsed time is (sum of the average number of attracted insects at each elapsed time in the waist area = 7.5) / 6 = 1.25, resulting in an average number of settled insects of 1.3.

[0066] As shown in FIG. 6A, the average combined number of settled insects in the waist regions 1F and 1B of diaper 1 (sample 1) containing repellent AM was 1.3, while the average combined number of settled insects in the crotch region 1C was 0.3. This clearly indicates that the average combined number of settled insects in the crotch region 1C was lower than the average combined number of settled insects in the ventral waist region 1F and the back waist region 1B. Meanwhile, for sample 2 of diaper 1 without repellent AM, the average combined number of settled insects in the waist regions 1F and 1B was 2.2, while the average combined number of settled insects in the crotch region 1C was 0.8. Thus, by reducing the average combined number of settled insects in the crotch region 1C of diaper 1 containing repellent AM to be lower than the average combined number of settled insects in the ventral waist region 1F and the back waist region 1B, the diaper 1 can be effectively repellent around the wearer's legs while reducing the risk of applying too much repellent AM to the diaper 1.

[0067] In a diaper 1 provided with repellent AM, the average number of resident insects in the crotch region 1C can be reduced relative to the average number of resident insects in the ventral waist region 1F and the back waist region 1B by adjusting the ingredients, amount, and arrangement of the repellent AM in the diaper 1, applying the repellent AM in liquid form or in a microcapsule form, or by increasing the peel strength between the components of the diaper 1 to create uneven surfaces that make it difficult for insects to land on them. For example, when the repellent AM is applied throughout the entire diaper 1, the concentration of the repellent AM in the crotch region 1C may be higher than that in the ventral waist region 1F and the back waist region 1B. When the repellent AM is applied throughout the entire diaper 1, the basis weight of the repellent AM in the crotch region 1C may be higher than that in the ventral waist region 1F and the back waist region 1B. Furthermore, even if the repellent AM is applied over a larger area in the ventral waistline portion 1F and the back waistline portion 1B than in the crotch portion 1C, the concentration of the repellent AM in the crotch portion 1C may be higher than that in the ventral waistline portion 1F and the back waistline portion 1B. Even if the repellent AM is applied over a larger area in the ventral waistline portion 1F and the back waistline portion 1B than in the crotch portion 1C, the basis weight of the repellent AM in the crotch portion 1C may be higher than that in the ventral waistline portion 1F and the back waistline portion 1B. Furthermore, when the repellent AM is applied uniformly in concentration or basis weight throughout the entire diaper 1, the peel strength between the outer sheet 14 and the backsheet 13 in the crotch portion 1C may be increased. The relationship between peel strength and repellent effect will be described later.

[0068] Furthermore, when the above-mentioned insect attraction test is conducted on the diaper 1 four hours after removal from the package, it is preferable that the average number of insects settled in the crotch area 1C after four hours is less than the average number of insects settled in the ventral waist area 1F and the dorsal waist area 1B after four hours. The diaper 1 four hours after removal from the package refers to the diaper 1 four hours after the unopened package is opened, the diaper 1 is taken out, and it is exposed to the outside.

[0069] To determine the average number of insects that settled after 4 hours, diapers 1 were removed from the package, placed on a flat surface, and allowed to stand for 4 hours, and then subjected to the same insect-attracted number test as described above. Sample 3 was a sample in which diapers 1 with repellent AM were worn by model D after being removed from the package for 4 hours, and sample 4 was the same as sample 3 except that it did not contain repellent AM. As above, each model D was previously fitted with stockings, and a disposable warmer was placed on the ventral (or dorsal) side of each sample.

[0070] Figure 6B shows the results of an insect-attraction test of diaper 1 four hours after removal from the package. The "average number of settled insects" in Figure 6B refers to the "average number of settled insects after four hours." As shown in Figure 6B, the combined average number of settled insects in the waistband 1F and 1B of diaper 1 (sample 3) after four hours (the average number of settled insects after four hours) was 0.5, and the combined average number of settled insects in the crotch area 1C after four hours (the average number of settled insects after four hours) was 0.2. This clearly indicates that the average number of settled insects in the crotch area 1C after four hours was less than the average number of settled insects in the ventral waistband 1F and dorsal waistband 1B after four hours. On the other hand, for sample 4 of diaper 1 without repellent AM, the combined average number of settled insects in the waistband 1F and 1B (the average number of settled insects after four hours) was 2.2, and the combined average number of settled insects in the crotch area 1C (the average number of settled insects after four hours) was 3.3. In this way, for a diaper 1 equipped with repellent AM after 4 hours, the average number of insects that have settled in the crotch area 1C after 4 hours is less than the average number of insects that have settled in the ventral waist area 1F and the dorsal waist area 1B after 4 hours, thereby maintaining the repellent effect around the wearer's legs for a long period of time while reducing the risk of applying too much repellent AM to the diaper 1.

[0071] In addition, for a diaper 1 containing repellent AM, examples of means for reducing the average number of settled insects in the crotch area 1C after 4 hours to be less than the average number of settled insects in the ventral waist area 1F and the dorsal waist area 1B after 4 hours include the ingredients, amount, and placement of the repellent AM in the diaper 1, or applying the repellent AM in liquid form or in a microcapsule-encapsulated state.

[0072] As shown in Fig. 7, the diaper 1 in its unfolded and stretched state has a square reference region aa measuring 1 cm in both the longitudinal and width directions, a square comparison region ba measuring 1 cm in both the longitudinal and width directions, and a back-side edge region Hb. Fig. 7 is a diagram illustrating the reference region aa and the comparison region ab. Fig. 7 is a schematic view from the non-skin side, and for convenience, components such as elastic members 23, 33 are omitted from Fig. 7. The ventral side in the longitudinal direction is also referred to as "one side," and the back side is also referred to as "the other side."

[0073] The reference region aa overlaps the absorbent core 12 when viewed in the thickness direction, and is located between the center position CL of the diaper 1 and the back end 12bc of the absorbent core in the longitudinal direction.

[0074] The back end region Hb is a region extending from one end to the other in the width direction of the back waistline portion 30 and having a length of 1 cm on one side from the back end 30e in the longitudinal direction of the diaper 1. The regions extending from one end to the other in the width direction of the back waistline portion 30 are regions between the inner ends in the width direction of the joint portions 2. The length of 1 cm on one side from the back end 30e in the longitudinal direction of the diaper 1 is the longitudinal length of the back end region Hb.

[0075] In such a diaper 1, regardless of the position of the comparison region ba in the back-side end region Hb, the basis weight of the repellent AM in the reference region aa is higher than the basis weight of the repellent AM in the comparison region ba. As shown in FIG. 7, for example, even if the comparison region ba is positioned at region ba1 in the back-side end region Hb, the basis weight of the repellent AM in the reference region aa is higher than the basis weight of region ba1. Even if the comparison region ba is positioned at region ba2, the basis weight of the repellent AM in the reference region aa is higher than the basis weight of region ba2. Even if the comparison region ba is positioned at region ba3, the basis weight of the repellent AM in the reference region aa is higher than the basis weight of region ba3. The longitudinal length (the longitudinal length of the back-side end region Hb) of regions ba1, ba2, and ba3 is 1 cm, and the width direction length is 1 cm. In this way, no matter where the comparison area ba is located in the back-side end area Hb, the basis weight of the repellent AM in the reference area aa is higher than the basis weight of the repellent AM in the comparison area ba.

[0076] In the diaper 1 of the present invention, regardless of the position of the comparison region ba in the back end region Hb, the basis weight of the repellent AM in the reference region aa is higher than the basis weight of the repellent AM in the comparison region ba, allowing for a smaller amount of repellent AM to be used in the diaper 1 than when the basis weight of the repellent AM in the back end region Hb is equal to or greater than the basis weight of the reference region aa. In other words, the risk of using excessive insect repellent can be reduced compared to when the insect repellent AM is uniformly applied throughout the entire diaper 1. Furthermore, the basis weight of the repellent AM in the wearer's reference region aa is higher than the basis weight of the repellent AM in the comparison region ba, making it easier to exert a repellent effect around the wearer's legs (lower body) and preventing insect bites. It is particularly likely that the wearer is an infant, who will wear a shirt or the like on the upper half of their body but only the diaper 1 on the lower half of their body. Even in such a case, the insect repellent AM can be effectively exerted on the legs of the wearer while reducing the risk of excessive use of the insect repellent AM.

[0077] Furthermore, as in the case of the diaper 1, the insect repellent AM is provided on the back side of the diaper 1, and regardless of the position of the comparison area ba in the back end region Hb, it is preferable that the basis weight of the repellent AM in the reference region aa be greater than the basis weight of the repellent AM in the comparison area ba. Generally, people are less likely to pay attention to the back side than the ventral side. This can improve the repellent effect on the back side of the wearer, and can improve the repellent effect on the back side of the diaper 1 when, for example, the wearer is sleeping face down.

[0078] The center ac of the reference region aa is located longitudinally at the midpoint cb12 between the center position CL of the diaper 1 and the back end 12bc of the absorbent core 12, and is located widthwise at the center position CC of the diaper 1. Regardless of the position of the comparison region ba in the back end region Hb, the basis weight of the repellent AM in the reference region aa may be higher than the basis weight of the repellent AM in the comparison region ba. Even in this case, regardless of the position of the comparison region ba in the back end region Hb, the basis weight of the repellent AM in the reference region aa is higher than the basis weight of the repellent AM in the comparison region ba. This allows the amount of repellent AM used in the diaper 1 to be reduced compared to when the basis weight of the repellent AM in the back end region Hb is equal to or greater than that of the reference region aa, while still providing effective insect repellent effects around the wearer's legs.

[0079] Basis weight (g / m) of repellent AM in reference area aa 2 ) and the basis weight (g / m ) of the repellent AM in the comparison area ba (e.g., ba1, ba2, ba3). 2 The comparison of the above can be carried out using a gas chromatography device (Agilent 7890B or an equivalent device).

[0080] (1) First, a reference region aa to be measured and multiple comparison regions ba (e.g., ba1, ba2, ba3) are cut out from the back waistband portion 30 and the absorbent body 10 of the diaper 1. The cut-out reference region aa and comparison regions ba each form a square sample measuring 10 mm x 10 mm in the longitudinal direction x width direction. (2) Next, the sample is immersed in water, etc., to extract a mixture of the repellent AM (the component with insect repellent effect) and other components (solvent, etc.) from the sample. (3) The mixture extracted for each sample is subjected to component analysis using a gas chromatography device. Then, for each sample, the peak value of the repellent AM (the component with insect repellent effect) and the peak values ​​of other components (solvent, etc.) are obtained, and the ratio of the peak value of the repellent to the peak values ​​of the other components (peak value of repellent / peak value of other components) is calculated. This ratio corresponds to the amount of repellent AM that was applied to the sample. (4) Finally, calculate the repellent ratio of each sample (repellent peak value / other component peak value ≒ amount of repellent AM) and use this as the basis weight of the repellent AM in the reference area aa and the comparison area ba. Then, compare the basis weights of the repellent AM obtained by the calculation.

[0081] In addition, for each cut sample, the components of each sample (for example, the skin-side sheet 31, the non-skin-side sheet 32 ​​in the back waist portion 30, etc.) may be separated, and the amount of each repellent AM in each component may be measured and added up to calculate and compare the basis weight of the repellent AM in the reference area aa and the comparison area ba.

[0082] As described above, the diaper 1 provided with the repellent AM has an outer sheet (non-skin-side sheet) 14 located closest to the skin in the crotch portion 1C, and a back sheet (skin-side sheet) 13 adjacent to the outer sheet 14 from the skin side (see FIG. 4). The outer sheet 14 and the back sheet 13 are joined together with an adhesive such as a hot melt adhesive.

[0083] Furthermore, as shown in FIG. 8, the crotch portion 1C of the diaper 1 includes a ventral crotch region (one-side crotch region) 1Ca and a dorsal crotch region (other-side crotch region) 1Cb. FIG. 8 is a diagram illustrating each region of the diaper 1. FIG. 8 is a schematic view from the non-skin side, and for convenience, elastic members 23, 33, etc. are omitted from the illustration. The ventral side in the longitudinal direction is also referred to as the "one side," and the dorsal side is also referred to as the "other side." The ventral crotch region 1Ca is the region from the ventral end of the crotch portion 1C in the longitudinal direction to the center position CL of the diaper 1. The dorsal crotch region 1Cb is the region from the dorsal end of the crotch portion 1C in the longitudinal direction to the center position CL of the diaper 1.

[0084] The maximum value of the peel strength between the exterior sheet 14 and the back sheet 13 in the entire back-side crotch region 1Cb is higher than the maximum value of the peel strength between the exterior sheet 14 and the back sheet 13 in the entire abdominal crotch region 1Ca. In other words, the dorsal crotch region 1Cb has a portion where the exterior sheet 14 and the back sheet 13 are more firmly joined than the abdominal crotch region 1Ca.

[0085] Insects, such as mosquitoes, generally find it easier to land on uneven surfaces than on smooth surfaces. When the outer sheet 14 and the back sheet 13 separate, a gap is created between them. If the diaper 1 is worn while this gap remains, the sheets 14 and 13 may rub against each other in the gap between them, causing the fibers of the skin-side surface of the outer sheet 14 or the non-skin-side surface of the back sheet 13 to become frayed, resulting in the formation of irregularities on the bonded surfaces and exposing the irregularities. In contrast, the higher the maximum peel strength between the outer sheet 14 and the back sheet 13, the stronger the bond between the outer sheet 14 and the back sheet 13, making it less likely that a gap will form between the outer sheet 14 and the back sheet 13 due to peeling. This reduces the risk of the sheets 14 and 13 rubbing against each other in the gap between the outer sheet 14 and the back sheet 13 when worn, resulting in the formation of irregularities on the surfaces of the sheets 14 and 13. By reducing the risk of peeling between the outer sheet 14 and the back sheet 13, unevenness is less likely to form on the skin side of the outer sheet 14 or the non-skin side of the back sheet 13, reducing the risk of insects such as mosquitoes landing on the back crotch area 1C, thereby providing an insect repellent effect in the back crotch area 1Cb and allowing the amount of insect repellent used in the diaper 1 to be reduced.

[0086] For example, by providing a repellent effect on the back side (back crotch region 1Cb) due to the peel strength between the outer sheet 14 and the back sheet 13 and providing a repellent AM on the ventral side (ventral waistline 20, ventral crotch region 1Ca), the diaper 1 can provide insect repellent effects on both the ventral and back sides of the wearer while reducing the risk of excessive use of the repellent AM. Because people tend to pay less attention to their back side than their ventral side, improving the repellent effect on the back side of the wearer can more effectively prevent insect bites. Furthermore, for infants who often sleep face down, insect repellent on the back side of the wearer is required. By providing a repellent effect on the back side (back crotch region 1Cb) due to the peel strength between the outer sheet 14 and the back sheet 13 and providing a repellent AM on the back side of the diaper 1 (back waistline 30, back crotch region 1Cb), the diaper 1 can more effectively repel insects from the back side of the wearer.

[0087] Furthermore, in this embodiment, the maximum peel strength between the exterior sheet 14 and the back sheet 13 throughout the entire back crotch region 1Cb is set to be higher than the maximum peel strength between the exterior sheet 14 and the back sheet 13 throughout the entire ventral crotch region 1Ca, but the maximum peel strength between the exterior sheet 14 and the back sheet 13 throughout the entire ventral crotch region 1Ca may also be set to be higher than the maximum peel strength between the exterior sheet 14 and the back sheet 13 throughout the entire back crotch region 1Cb.

[0088] In this case, the risk of peeling between the outer sheet 14 and the back sheet 13 in the ventral crotch region 1Ca can be reduced, and the risk of unevenness being formed on the skin-side surface of the outer sheet 14 or the non-skin-side surface of the back sheet 13 can be reduced, thereby reducing the risk of insects such as mosquitoes landing on the ventral crotch portion 1C. Because the insect repellent effect is exerted in the ventral crotch region 1Ca, the amount of insect repellent used in the diaper 1 can be reduced.

[0089] For example, by providing a repellent effect on the ventral side (ventral crotch region 1Ca) due to the peel strength between the outer sheet 14 and the back sheet 13, and providing a repellent AM on the back side (back waist portion 30, back crotch region 1Cb), the diaper 1 can provide insect repellent effects on both the ventral and back sides of the wearer while reducing the risk of excessive use of the repellent AM. Furthermore, for infants who often sleep on their backs, insect repellency on the ventral side of the wearer is required. By providing a repellent effect on the ventral side (ventral crotch region 1Ca) due to the peel strength between the outer sheet 14 and the back sheet 13, and providing a repellent AM on the ventral side of the diaper 1 (ventral waist portion 20, ventral crotch region 1Ca), insect repellency on the ventral side of the wearer can be effectively achieved.

[0090] "Peel strength" refers to the strength of the bond and is also the magnitude of the force required to peel the bond. The peel strength of each bond can be measured by a known method. For example, first, the ventral crotch region 1Ca and the back crotch region 1Cb are cut out from the diaper 1. Next, the joined outer sheet 14 and back sheet 13 are removed from the cut-out ventral crotch region 1Ca and back crotch region 1Cb, respectively, to form samples. Tape is then applied to both sides of the widthwise end or longitudinal end of each sample (the surface of the outer sheet 14 and the surface of the back sheet 13) to create a pair of grips. Each of the pair of grips is then clamped between the chucks of a tensile tester. Then, the load of the tensile tester is set to zero, and the gripping portion on the exterior sheet 14 side is pulled in one direction in the thickness direction (the non-skin side), and the gripping portion on the back sheet 13 side is pulled in the other direction in the thickness direction (the skin side), to peel the exterior sheet 14 and the back sheet 13 of the sample apart, and the peeling force is measured. The distance between the chucks is 10 mm, the pulling speed is 100 mm / min, and the maximum load is read. This measurement is performed multiple times (N=10) and the average value of the maximum load is calculated. The calculated maximum load is converted to a load per unit width (N / 25 mm), and the value is compared as the magnitude of the peel force (peel strength). Note that the measurement is preferably performed in a constant environment (e.g., a temperature of 20°C (±2°C), a humidity of 60% (±5%)) and the sample temperature is stable. The sample measured using the tensile tester may be the entire area of ​​the ventral crotch region 1Ca and the entire area of ​​the dorsal crotch region 1Cb, or the entire area of ​​the ventral crotch region 1Ca and the entire area of ​​the dorsal crotch region 1Cb may each be cut into 25 mm x 25 mm sample pieces, and the magnitude of the peel force of all the obtained sample pieces may be measured.

[0091] When the maximum peel strength between the outer sheet 14 and the back sheet 13 throughout the back crotch region 1Cb is higher than the maximum peel strength between the outer sheet 14 and the back sheet 13 throughout the entire abdominal crotch region 1Ca, it is preferable that the maximum basis weight of the repellent AM in the back crotch region 1Cb is higher than the maximum basis weight of the repellent AM in the abdominal crotch region 1Ca. This reduces the formation of surface irregularities on the back side of the diaper 1 (back crotch region 1Cb) due to peeling between the outer sheet 14 and the back sheet 13, thereby reducing the risk of mosquitoes landing on the back crotch part 1C of the diaper 1. This, combined with the effect of the repellent AM provided in the back crotch region 1Cb of the diaper 1, reduces the risk of excessive use of insect repellent and enhances the repellent effect of the back side of the diaper 1 (back crotch region 1Cb). In particular, when the wearer is sleeping face down, the repellent effect of the diaper 1 can be enhanced in the area on the back of the wearer, thereby reducing the amount of repellent AM used and still achieving an effective repellent effect.

[0092] If the maximum peel strength between the outer covering sheet 14 and the back sheet 13 throughout the entire ventral crotch region 1Ca is higher than the maximum peel strength between the outer covering sheet 14 and the back sheet 13 throughout the entire back crotch region 1Cb, it is preferable that the maximum basis weight of the repellent AM in the ventral crotch region 1Ca be higher than the maximum basis weight of the repellent AM in the back crotch region 1Cb. This makes it difficult for the ventral side of the diaper 1 (ventral crotch region 1Ca) to have unevenness on its surface due to peeling between the outer covering sheet 14 and the back sheet 13, reducing the risk of mosquitoes landing on the ventral crotch part 1C of the diaper 1. This, combined with the effect of the repellent AM provided in the ventral crotch region 1Ca of the diaper 1, reduces the risk of excessive use of insect repellent and enhances the repellent effect of the ventral part of the diaper 1 (ventral crotch region 1Ca). In particular, when the wearer is lying on his back, the repellent effect of the diaper 1 can be enhanced in the abdominal area of ​​the wearer, thereby reducing the amount of repellent AM used while still providing an effective repellent effect.

[0093] On the other hand, when the maximum peel strength between the outer covering sheet 14 and the back sheet 13 throughout the entire back-side crotch region 1Cb is higher than the maximum peel strength between the outer covering sheet 14 and the back sheet 13 throughout the entire front-side crotch region 1Ca, the maximum basis weight of the repellent AM in the front-side crotch region 1Ca may be higher than the maximum basis weight of the repellent AM in the back-side crotch region 1Cb. This reduces the formation of surface irregularities on the back side of the diaper 1 (back-side crotch region 1Cb) due to peeling between the outer covering sheet 14 and the back sheet 13, thereby reducing the risk of mosquitoes landing on the back-side crotch part 1C of the diaper 1. Furthermore, the repellent AM provided in the front-side crotch region 1Ca exerts an insect repellent effect on both the front and back sides of the wearer, reducing the risk of insect bites while reducing the risk of excessive use of the insect repellent AM.

[0094] If the maximum peel strength between the outer covering sheet 14 and the back sheet 13 over the entire ventral crotch region 1Ca is higher than the maximum peel strength between the outer covering sheet 14 and the back sheet 13 over the entire ventral crotch region 1Cb, the maximum basis weight of the repellent AM in the ventral crotch region 1Ca may be higher than the maximum basis weight of the repellent AM in the ventral crotch region 1Ca. This reduces the formation of surface irregularities on the ventral side of the diaper 1 (ventral crotch region 1Ca) due to peeling between the outer covering sheet 14 and the back sheet 13, thereby reducing the risk of mosquitoes landing on the ventral crotch part 1C of the diaper 1. Furthermore, the repellent AM provided in the ventral crotch region 1Cb exerts an insect repellent effect on both the ventral and dorsal sides of the wearer, reducing the risk of excessive use of the insect repellent AM and reducing the risk of insect bites.

[0095] The maximum basis weight of the repellent AM in each region can be determined using the same method as for measuring the basis weight described above. For example, similar to the method for measuring the basis weight described above, square samples measuring 10 mm x 10 mm in the longitudinal direction x width direction may be cut out from all regions of the ventral crotch region 1Ca and the dorsal crotch region 1Cb, and the maximum basis weight for each region may be obtained from the basis weight results of all the samples.

[0096] As shown in FIG. 8, the crotch portion 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 portion 1C is divided into three equal parts in the width direction. The side regions Ce are regions located on both sides of the central region. The central region Cc in the ventral crotch region 1Ca is the ventral central region Cac, and the side regions Ce in the ventral crotch region 1Ca are the ventral side regions Cae. The central region Cc in the dorsal crotch region 1Cb is the dorsal central region Cbc, and the side regions Ce in the dorsal crotch region 1Cb are the dorsal side regions Cbe.

[0097] It is preferable that the maximum peel strength between the exterior sheet 14 and the back sheet 13 in the entire back side regions Cbe is higher than the maximum peel strength between the exterior sheet 14 and the back sheet 13 in the entire back central region Cbc. Reducing the risk of peeling between the exterior sheet 14 and the back sheet 13 in the back side regions Cbe reduces the risk of insects such as mosquitoes landing on the back side regions Cbe, which makes it easier to improve the insect repellent effect in the regions near the leg openings LH of the diaper 1.

[0098] As in the back crotch region 1Cb, the maximum peel strength between the outer sheet 14 and the back sheet 13 throughout the entire ventral side region Cae may be higher than the maximum peel strength between the outer sheet 14 and the back sheet 13 throughout the entire ventral central region Cac. This reduces the risk of insects such as mosquitoes landing on the ventral side region Cae, thereby enhancing the insect repellent effect in the regions near the leg openings LH of the diaper 1. Both the ventral crotch region 1Ca and the back crotch region 1Cb may have such peel strength.

[0099] On the other hand, the maximum peel strength between the exterior sheet 14 and the back sheet 13 throughout the back center region Cbc may be higher than the maximum peel strength between the exterior sheet 14 and the back sheet 13 throughout the back side regions Cbe. This reduces the risk that the exterior sheet 14 and the back sheet 13 will completely peel off in the back crotch region 1Cb, exposing unevenness caused by the peeling between the exterior sheet 14 and the back sheet 13 throughout the back crotch region 1Cb. This reduces the risk that insects such as mosquitoes will land on the back crotch region 1Cb, making it easier to improve the insect repellent effect of the back crotch region 1Cb.

[0100] As in the back-side crotch region 1Cb, the maximum peel strength between the exterior sheet 14 and the back sheet 13 in the entire ventral central region Cac may be higher than the maximum peel strength between the exterior sheet 14 and the back sheet 13 in the entire ventral side region Cae. Both the ventral crotch region 1Ca and the back-side crotch region 1Cb may have such peel strength.

[0101] Furthermore, it is preferable that the maximum basis weight of the repellent AM in the back side regions Cbe be higher than the maximum basis weight of the repellent AM in the back central region Cbc of the back crotch region 1Cb, which makes it easier to improve the insect repellent effect in the regions near the back leg openings LH of the diaper 1 when worn, compared to when the maximum basis weight of the repellent AM in the back central region Cbc is higher than the maximum basis weight of the repellent AM in the back side regions Cbe.

[0102] In addition to the back-side crotch region 1Cb, the maximum basis weight of the repellent AM in the ventral side regions Cae may be higher than the maximum basis weight of the repellent AM in the ventral central region Cac in the ventral crotch region 1Ca. Also, both the ventral crotch region 1Ca and the back-side crotch region 1Cb may have this configuration.

[0103] On the other hand, the maximum basis weight of the repellent AM in the back center region Cbc of the back crotch region 1Cb may be higher than the maximum basis weight of the repellent AM in the back side regions Cbe. Since the repellent AM in the back center region Cbc is provided in a larger amount than in the back side regions Cbe, it can exert its effect toward the leg openings LH on both sides in the width direction, thereby reducing the risk of excessive use of the repellent AM in the diaper 1.

[0104] The maximum basis weight of the repellent AM in the ventral central region Cac may be higher than the maximum basis weight of the repellent AM in the ventral side regions Cae, as well as in the dorsal crotch region 1Cb. Alternatively, both the ventral crotch region 1Ca and the dorsal crotch region 1Cb may have this configuration.

[0105] FIG. 9 is a diagram illustrating each region of the diaper 1. FIG. 9 is a schematic view from the non-skin side, and for convenience, components such as elastic members 23 and 33 are omitted from FIG. 9. As shown in FIG. 9, the back-side crotch region 1Cb has a first region Cb1 and a second region Cb2. The first region Cb1 is the longitudinally and widthwise central region when the back-side crotch region 1Cb is divided into three equal parts. The second region Cb2 is the region of the back-side crotch region 1Cb excluding the first region Cb1. In other words, the first region Cb1 is the central region of the back-side crotch region 1Cb, and the second region Cb2 is the region of the back-side crotch region 1Cb surrounding the first region Cb1.

[0106] It is preferable that the maximum peel strength between the exterior sheet 14 and the back sheet 13 throughout the first region Cb1 is equal to or greater than the maximum peel strength between the exterior sheet 14 and the back sheet 13 throughout the second region Cb2. This reduces the risk of complete peeling between the exterior sheet 14 and the back sheet 13 in the back crotch region 1Cb and exposure of unevenness due to peeling between the exterior sheet 14 and the back sheet 13 throughout the back crotch region 1Cb, compared to when the maximum peel strength between the exterior sheet 14 and the back sheet 13 throughout the first region Cb1 is lower than the maximum peel strength between the exterior sheet 14 and the back sheet 13 throughout the second region Cb2. This makes it more difficult for insects such as mosquitoes to land on the back crotch region 1Cb, which makes it easier to enhance the insect repellent effect of the back crotch region 1Cb. The ventral crotch region 1Ca may have the same configuration as the dorsal crotch region 1Cb, or both the ventral crotch region 1Ca and the dorsal crotch region 1Cb may have such a configuration.

[0107] Furthermore, it is preferable that 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 in the first region Cb located in the central portion (middle) of the back-side crotch region 1Cb to exert its effect toward the leg-hole openings LH on both sides in the width direction. This reduces the risk of excessive repellent AM being applied to the diaper 1.

[0108] As described above, the crotch portion 1C has the back sheet 13, which is a liquid-impermeable sheet, provided on the non-skin side of the absorbent core 12. It is preferable that the repellent AM is provided at least on the non-skin side of the back sheet 13. This reduces the risk that the repellent AM provided on the non-skin side of the back sheet 13 (liquid-impermeable sheet) will penetrate into the absorbent core 12, and reduces the risk that the repellent AM will mix with excrement such as urine absorbed during wear.

[0109] It is also preferable that the repellent AM be provided on a liquid-impermeable sheet, the back sheet 13. This reduces the risk of the repellent AM permeating into the material and makes it easier to maintain the repellent AM in a state where it is placed on the back sheet 13, making it easier to maintain the repellent effect of the repellent AM.

[0110] When the diaper 1 includes an SMS (spunbond / meltblown / spunbond) nonwoven fabric sheet, the repellent AM may be provided on the surface of the SMS nonwoven fabric sheet. The repellent AM provided on the surface of the SMS nonwoven fabric sheet does not pass through the meltblown layer of the SMS nonwoven fabric, and therefore tends to remain on the surface of the SMS nonwoven fabric sheet, making it easier to maintain the repellent effect of the repellent AM.

[0111] When the diaper 1 has a breathable film (sheet member), it is preferable that the repellent AM overlaps with the breathable film in the thickness direction of the unfolded and stretched diaper 1. When the repellent AM overlaps with the breathable film in the thickness direction, it becomes easier to limit the direction in which the volatilized components of the repellent AM evaporate, making it easier to effectively exert the repellent AM.

[0112] On the other hand, when the diaper 1 has a breathable film (sheet member), the repellent AM may overlap the breathable film in the thickness direction of the unfolded and stretched diaper 1. When the repellent AM overlaps the breathable film in the thickness direction, the volatilized repellent AM components can be more easily spread over a wide area of ​​the diaper 1.

[0113] The repellent AM of the diaper 1 may be provided in the ventral waistline portion 20 or the back waistline portion 30. The ventral waistline portion 20 or the back waistline portion 30 has elastic members 23, 33 that are stretchable in the width direction, respectively. However, when the ventral waistline portion 20 or the back waistline portion 30 has a non-stretchable region where the elastic members 23, 33 do not stretch, it is preferable that the repellent AM overlaps the non-stretchable region in the thickness direction (front-to-back direction). This can reduce the risk that the repellent effect of the repellent AM will be hindered by wrinkles caused by contraction of the elastic members 23, 33, and the repellent effect of the repellent AM can be effectively released to the outside.

[0114] Furthermore, the crotch portion 1C of the diaper 1 where the repellent AM is applied preferably has a mark M indicating the area where the repellent AM is applied. It is more preferable that, when the diaper 1 is viewed in the thickness direction, the area where the repellent AM is applied overlaps with the mark M. This allows the wearer to easily recognize the area where the repellent AM can exert its repellent effect.

[0115] The marker portion M of the diaper 1 of this embodiment is formed by printing in a color (e.g., green or yellow) different from the surrounding color (e.g., white). Specifically, the marker portion M printed on the back sheet 13 located in the crotch portion 1C is visible from outside the diaper 1 through the exterior sheet 14.

[0116] As shown in Figure 2, the marking portion M has the letters "AntiMos" and a design indicating that the diaper 1 has insect (mosquito) repellent properties. When the diaper 1 is viewed in the thickness direction, the letters and design overlap with the portion where the repellent AM is applied. A wearer or the like can easily identify the portion where the repellent AM is applied.

[0117] 2, the marking portion AM may be a patterned area, a plain colored area, or the like. The material on which the marking portion AM is printed is not limited to the backsheet 13, and the marking portion AM may be printed on other materials (such as nonwoven fabric) constituting the diaper 1. The marking portion AM may be formed by compressing the diaper 1 in the thickness direction to form a compressed portion (concave and convex) or by coloring the waist-surrounding elastic members 23, 33 or the repellent AM itself, thereby forming the marking portion AM in a color different from the surrounding area.

[0118] It is preferable that the color of the crotch portion 1C of the diaper 1 be less transparent than the color of the waist portions 1F and 1B. Because mosquitoes and other insects tend to be attracted to the color of human skin, by making the color of the crotch portion 1C less transparent than the color of the waist portions 1F and 1B, the repellent effect of the crotch portion 1C (around the wearer's legs) can be enhanced more easily than if the color of the crotch portion 1C were more transparent than the color of the waist portions 1F and 1B, and the amount of repellent AM used in the diaper 1 can be reduced.

[0119] It is preferable that the thermal conductivity of the crotch portion 1C of the diaper 1 be lower than that of the waist portions 1F, 1B. Because insects such as mosquitoes have a tendency to approach objects that have a temperature close to that of a human body, if the thermal conductivity of the crotch portion 1C is lower than that of the waist portions 1F, 1B, the repellent effect of the crotch portion 1C (around the wearer's legs) can be enhanced more easily than if the thermal conductivity of the crotch portion 1C were equal to or higher than that of the waist portions 1F, 1B, and the amount of repellent AM used in the diaper 1 can be reduced.

[0120] Furthermore, it is preferable that the breathability of the crotch portion 1C of the diaper 1 be lower than that of the waist portions 1F, 1B. Because mosquitoes and other insects have a tendency to prefer carbon dioxide and are drawn to it, making the breathability of the crotch portion 1C lower than that of the waist portions 1F, 1B and making the breathability of the crotch portion 1C equal to or greater than that of the waist portions 1F, 1B can reduce the number of mosquitoes and other insects approaching the crotch portion 1C (leg openings LH). This allows the amount of repellent AM used in the diaper 1 to be reduced.

[0121] The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and it goes without saying that the present invention includes equivalents thereof. [Explanation of symbols]

[0122] 1. Diapers (pants-type disposable diapers, disposable diapers), 1F: Ventral waist (one side waist), 1B back waist part (other side waist part), 1C Inseam, 1Ca ventral inseam area (unilateral inseam area), 1Cb Dorsal inseam area (other side inseam area), 2 joints, 10. Absorbent body; 11 top sheet, 12 absorbent core, 13 back sheet (skin side sheet), 14 exterior sheet (non-skin side sheet), 15 Elastic member around the legs, 16 leak-proof wall portion, 161 leak-proof wall elastic member, 20 ventral girth, 21 skin side sheet, 22 non-skin side sheet, 23 waist elastic member, 30 back waist area, 31 skin side sheet, 32 non-skin side sheet, 33 waist elastic member, LH leg opening, BH waist opening, aa reference area, ba comparison area, ba1, ba2, ba3 areas, Cc central region, Ce lateral region, Cbc dorsal central region, Cbe dorsal lateral region, M Mark

Claims

1. In a deployed and stretched state, the sheet has a longitudinal direction, a width direction, and a thickness direction that intersect with each other, A disposable diaper for babies, comprising a one-side waistband portion provided on one side in the longitudinal direction, a second-side waistband portion provided on the other side in the longitudinal direction, and a crotch portion, the one-side waistline portion and the other-side waistline portion have joints at both ends in the width direction for joining the one-side waistline portion and the other-side waistline portion, In the longitudinal direction, an area in which the joint is located corresponds to the one-side waistline portion and the other-side waistline portion, In the longitudinal direction, a region between the one-side waistline portion and the other-side waistline portion is the crotch portion, It is equipped with a volatile insect repellent, the repellent is provided at a position overlapping the absorbent core in the thickness direction, the repellent agent is provided in the longitudinal direction between the back waist portion as the other waist portion and a center line in the longitudinal direction of the disposable diaper, and in a central region when the crotch portion is divided into three equal parts in the width direction, the repellent is not provided at a position overlapping the one-side waistline portion in the longitudinal direction, and is not provided at a position overlapping the other-side waistline portion, an extension portion extending to one side is provided on one side of the joint portion in the longitudinal direction of the back-side waistband portion, and the repellent is provided on the one side of the extension portion; the maximum value of the basis weight of the repellent in the central region is higher than the maximum value of the basis weight of the repellent in side regions located on both outer sides of the central region in the width direction, In a test to measure the number of attracted insects using female adult Aedes aegypti mosquitoes for the disposable diaper 20 minutes after removal from the package, The average number of insects fixed in the crotch area is is less than the total average number of settled insects in the one-side waist circumference portion and the other-side waist circumference portion A disposable diaper for babies.

2. The disposable diaper according to claim 1, In the attracted insect number test using female adult Aedes aegypti mosquitoes for the disposable diaper after 4 hours had passed since it was removed from the package, The average number of insects fixed in the crotch area after 4 hours is A disposable diaper characterized in that the total average number of settled insects in the one side waistband portion and the other side waistband portion after four hours is less than the total average number of settled insects in the one side waistband portion and the other side waistband portion after four hours.

3. A disposable diaper according to claim 1 or 2, The crotch portion includes a one-side crotch region and an other-side crotch region, the one-side crotch region is a region extending from the one end of the crotch portion to a center position of the disposable diaper in the longitudinal direction, the other-side crotch region is a region extending from the other end of the crotch portion to a center position of the disposable diaper in the longitudinal direction, the other-side crotch region includes a first region and a second region, the first region is a region at the center in the longitudinal direction and the center in the width direction when the other-side crotch region is divided into three equal parts in each of the longitudinal direction and the width direction, the second region is a region of the other-side crotch region excluding the first region, A disposable diaper, characterized in that 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.

4. A disposable diaper according to claim 1 or 2, The crotch portion has an absorbent core and a liquid-impermeable sheet provided on the non-skin side of the absorbent core, The disposable diaper is characterized in that the repellent is provided at least on the non-skin side of the liquid-impermeable sheet.

5. A disposable diaper according to claim 1 or 2, The crotch portion has a marking portion that indicates the area where the repellent is provided, A disposable diaper characterized in that, when viewed in the thickness direction, there is a portion where the portion where the repellent is provided and the mark portion overlap.

Images