JP7097260B2 - Disposable diapers - Google Patents

Description

The present invention relates to a disposable diaper having a pair of low basis weight portions extending in the anterior-posterior direction in the inseam region.

Disposable diapers having a pair of groove-shaped portions extending in the anterior-posterior direction in the inseam region are known (see, for example, Patent Document 1). The groove-shaped portion serves as a deformation base point of the absorption core. The absorbent core of the disposable diaper configured in this way is deformed from the groove-shaped portion extending in the front-rear direction when worn, and is deformed in the thickness direction (see, for example, FIG. 4 of Patent Document 1).

Japanese Unexamined Patent Publication No. 2018-473

However, the above-mentioned disposable diapers have the following problems.
The grooved portion is a portion where the absorption core is compressed in the thickness direction. Therefore, when the body fluid is absorbed, the groove-shaped portion may swell and the deformed state of the absorption core may not be maintained.
In addition, the disposable diaper is worn so as to cover the abdomen from the buttocks of the wearer. In the disposable diaper of Patent Document 1, the groove-shaped portion extends in the front-rear direction, and the deformation with the groove-shaped portion as the base point also extends in the front-rear direction. However, the shape of the body on which the disposable diaper is worn is the narrowest in the crotch and bulges outward in the width direction from the crotch to the buttocks. Therefore, if the deformation of the absorbent core that fits the wearer's crotch continues to the rear waist circumference area and the front waist circumference area, the disposable diaper does not fit to the buttocks and abdomen, and a gap between the body and the disposable diaper occurs. , There was a risk of leakage.

Therefore, it is desired to have a disposable diaper that can suppress leakage by deforming the absorbent core along the crotch of the body and arranging the absorbent core along the portion other than the crotch of the wearer.

The disposable diaper according to one embodiment includes an anterior-posterior direction and a width direction orthogonal to each other, an anterior girth area, a rear girth area, an inseam area arranged between the anterior girth area and the rear girth area, and at least the inseam. A disposable diaper in which an absorption core arranged in the area and a pair of low basis weight portions extending in the anteroposterior direction and arranged at intervals in the width direction are formed in the absorption core in the inseam area. Therefore, the absorption core is provided with a high-rigidity portion having a higher rigidity than the surrounding region, and the high-rigidity portion is formed from the front-back end edge in the front-rear direction on the inner edge of the low basis weight portion. It straddles an inner extension line extending in the direction and an outer extension line extending in the front-rear direction from the end edge in the front-rear direction at the outer edge of the low basis weight portion.

It is a top view seen from the skin surface side of the disposable diaper which concerns on embodiment. It is a top view of the absorption core which concerns on embodiment. It is a schematic cross-sectional view along the AA cross section of the disposable diaper shown in FIG. It is a schematic cross-sectional view along the BB cross section of the disposable diaper shown in FIG. It is a schematic cross-sectional view along the CC cross section of the disposable diaper shown in FIG. It is a figure which schematically showed the wearing state in the AA cross section of a disposable diaper. It is a figure for demonstrating the deformation mode of the absorber in the BB cross section of a disposable diaper. It is a figure which showed schematically the wearing state of the disposable diaper which concerns on embodiment. It is a figure which showed the absorption core which has the deformation base point part which concerns on the modification.

(1) Outline of Embodiment At least the following matters will be clarified by the description of this specification and the accompanying drawings.
The disposable diaper according to one embodiment includes an anterior-posterior direction and a width direction orthogonal to each other, an anterior girth area, a rear girth area, an inseam area arranged between the anterior girth area and the rear girth area, and at least the inseam. A disposable diaper in which an absorption core arranged in the area and a pair of low basis weight portions extending in the anteroposterior direction and arranged at intervals in the width direction are formed in the absorption core in the inseam area. Therefore, the absorption core is provided with a high-rigidity portion having a higher rigidity than the surrounding region, and the high-rigidity portion is formed from the front-back end edge in the front-rear direction on the inner edge of the low basis weight portion. It straddles an inner extension line extending in the direction and an outer extension line extending in the front-rear direction from the end edge in the front-rear direction at the outer edge of the low basis weight portion.

According to this aspect, the absorption core in the inseam region is deformed based on the low basis weight portion extending in the front-rear direction when worn, and is deformed in the thickness direction, so that it can be easily fitted in the crotch of the wearer. Since the high-rigidity portion is provided across the inner extension line and the outer extension line, the deformation due to the low basis weight portion can be divided by the high-rigidity portion. It is possible to suppress the formation of a deformation base point due to the low basis weight portion over the entire longitudinal direction of the absorption core, and to suppress the formation of a gap between at least one of the buttocks and the abdomen and the disposable diaper. Therefore, while deforming the absorbent core along the crotch of the body, the absorbent core can be aligned with at least one of the wearer's buttocks and abdomen to suppress leakage. In addition, the low basis weight portion, which is the deformation base point of the absorption core, has a lower basis weight than the surrounding area, and the thickness can be suppressed even after absorbing the body fluid, and the deformed state can be maintained.

According to a preferred embodiment, the high-rigidity portion has a high-rigidity side edge that intersects at least one of the outer extension line and the inner extension line, and the side edge extension line extending along the high-rigidity side edge is a side edge extension line. It may intersect the outer edge of the absorption core.

According to this aspect, the deformation of the absorption core with respect to the low basis weight portion extends along the outer extension line or the inner extension line, and easily reaches the high-rigidity side edge. Further, the deformation that reaches the high-rigidity side edge extends along the high-rigidity side edge and the side edge extension line. Since the lateral edge extension line intersects the outer edge of the absorption core, deformation from the inseam region side is likely to be guided to the outer edge of the absorption core. It is easier to obtain the effect of dividing the deformation due to the low basis weight portion between the front high rigidity portion and the rear high rigidity portion. In addition, in the region on the front side of the front high-rigidity portion and the region on the rear side of the high-rigidity portion, the influence of deformation due to the low basis weight portion is reduced, and it becomes easier to secure the fit to the buttocks and the abdomen.

According to a preferred embodiment, the intersection of the side edge extension line and the outer edge of the absorption core may be located outside the high-rigidity side edge in the anteroposterior direction.

According to this aspect, the deformation due to the low basis weight portion can be guided to a position away from the crotch. Therefore, it is easier to align the absorbent core with at least one of the wearer's buttocks and abdomen while deforming the absorbent core along the crotch of the body.

According to a preferred embodiment, the absorption core has a narrow portion whose length in the width direction is shorter than the maximum width of the absorption core, and is an intersection of the side edge extension line and the outer edge of the absorption core. May be arranged in the narrow portion.

According to this aspect, the deformation due to the low basis weight portion can be guided to the narrow portion, and the deformation in the region of the maximum width of the absorption core can be suppressed. The region of maximum width of the absorption core can cover the buttocks and abdomen, further reducing leakage.

According to a preferred embodiment, the absorption core has a narrow portion whose length in the width direction is shorter than the maximum width of the absorption core, and is an intersection of the side edge extension line and the outer edge of the absorption core. May be arranged outside the narrow portion in the front-rear direction.

According to this aspect, the deformation due to the low basis weight portion can be easily guided to the outer region in the front-rear direction rather than the narrow portion. At a position farther than the narrow part, there is little deformation due to the movement of the legs. Therefore, even when the leg moves violently, the absorption core is not easily deformed, the length of the absorption core in the width direction can be secured, and the deformation due to the low basis weight portion can be absorbed. Therefore, even when the deformation base point along the wearer's inguinal region is formed in the absorption core due to the movement of the legs, it is possible to suppress the interlocking of the deformation along the inguinal region and the deformation due to the low basis weight portion. , The length of the absorption core in the width direction can be secured. Therefore, the absorption core can cover the buttocks and abdomen, and leakage can be further suppressed.

According to a preferred embodiment, the distance between the high rigidity portion and the low basis weight portion in the front-rear direction may be 15 mm or more and 30 mm or less.

According to this aspect, since the distance between the high rigidity portion and the low basis weight portion in the front-rear direction is 15 mm or more, the deformation of the absorption core due to the low basis weight portion does not reach the high rigidity portion as it is. It is easy to reach with weak deformation. Therefore, it is easier to obtain the effect of dividing the deformation of the absorption core by the high rigidity portion. Further, since the distance between the high rigidity portion and the low basis weight portion in the anteroposterior direction is 30 mm or less, the region where the deformation of the low basis weight portion propagates in the anteroposterior direction is reduced so as to cover the body in a wide range. Absorption core can be placed in.

According to a preferred embodiment, the high-rigidity portion includes a front high-rigidity portion arranged on the front side of the low-basis weight portion, and a rear high-rigidity portion arranged on the rear side of the low-basis weight portion. May have.

According to this aspect, it is possible to suppress the formation of a deformation base point due to the low basis weight portion over the entire longitudinal direction of the absorption core, and to suppress the formation of a gap between both the buttocks and the abdomen and the disposable diaper. While deforming the absorbent core along the crotch of the body, the absorbent core can be placed along the buttocks and abdomen of the wearer to suppress leakage.

According to a preferred embodiment, the length of the rear high-rigidity portion in the front-rear direction may be longer than the length of the front high-rigidity portion in the front-rear direction.

According to this aspect, since the length of the rear high-rigidity portion in the anteroposterior direction is long, it is easy to suppress deformation of the region with respect to the buttocks and secure a space for accommodating stool. On the other hand, the front high-rigidity portion has the effect of dividing the deformation of the low basis weight portion. The length of the front high-rigidity portion in the front-rear direction is relatively short, and it is easy to secure the area of the absorption core that covers the front waist circumference area.

According to a preferred embodiment, the center of the low basis weight portion in the anteroposterior direction is arranged behind the center of the disposable diaper in the anteroposterior direction, and the rear high rigidity portion and the low basis weight portion are arranged. The distance between the front and rear directions may be shorter than the distance between the front high rigidity portion and the low basis weight portion in the front-rear direction.

According to this aspect, since the low basis weight portion is biased to the rear side, the deformation with the low basis weight portion as the base point can be provided on the buttocks side. Further, since the distance between the rear high rigidity portion and the low basis weight portion in the front-rear direction is relatively short, the deformation of the absorption core with the rear high rigidity portion as the base point and the deformation of the absorption core due to the low basis weight portion are caused. It becomes easier to work together. Therefore, in the inseam region, the absorption core deformed to be closer to the body side makes it easier to cover the buttocks, and on the dorsal side, it can be widely covered along the shape of the buttocks. On the other hand, the distance between the front high-rigidity portion and the low-basis portion in the front-rear direction is relatively long, and it is easy to weaken the deformation caused by the low-basis portion to reach the front high-rigidity portion. It is easier to obtain the effect that the deformation due to the low basis weight portion can be divided by the front high rigidity portion.

According to a preferred embodiment, the front high-rigidity portion has a fastening tape arranged in the rear waist circumference region, and the front high-rigidity portion has a front high-rigidity side edge that intersects at least one of the outer extension line and the inner extension line. The rear high-rigidity portion has a rear high-rigidity side edge that intersects at least one of the outer extension line and the inner extension line, and at least the front high-rigidity side edge and the rear high-rigidity side edge. The rear high-rigidity side edge extends inward in the width direction toward the inside in the front-rear direction, and the angle of the front high-rigidity side edge with respect to the width direction is the angle of the rear high-rigidity side edge with respect to the width direction. It may be smaller than the angle.

According to this aspect, since the angle of the rear high rigidity side edge with respect to the width direction is relatively large, the absorption core can be deformed so that the length in the width direction of the absorption core becomes short in a short range in the front-rear direction. .. On the other hand, the front waistline area is the area where the rear waistline area and the inseam area are applied to the body at the time of wearing, and then the last area to be applied. Therefore, it is preferable that the front waist circumference area is arranged so as to cover the body in a flat state without providing a deformation base point at the time of wearing. Since the angle of the front high-rigidity side edge with respect to the width direction is relatively small, the deformation due to the low basis weight portion can be gently divided, and the body can be covered by the front waist circumference region in a flat state.

(2) Overall Outline of Disposable Diaper The disposable diaper according to the embodiment will be described below with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic and the ratio of each dimension is different from the actual one. Therefore, the specific dimensions, etc. should be determined in consideration of the following explanation. In addition, there may be a portion where the relationship and ratio of the dimensions of the drawings are different from each other.

The disposable diaper may be a tape-type disposable diaper or a panty-type disposable diaper. FIG. 1 is a plan view of the disposable diaper 10 according to the present embodiment as viewed from the skin surface side, and FIG. 2 is a plan view of the absorption core according to the embodiment as viewed from the skin surface side. The plan view shown in FIGS. 1 and 2 shows a disposable diaper in an extended state. FIG. 3 is a schematic cross-sectional view taken along the AA cross section of the disposable diaper shown in FIG. FIG. 4 is a schematic cross-sectional view taken along the BB cross section of the disposable diaper shown in FIG. FIG. 5 is a schematic cross-sectional view taken along the CC cross section of the disposable diaper shown in FIG. The stretched state in the present invention is a state in which the disposable diaper 10 is stretched to a state in which wrinkles are not formed. Further, the natural state in the present invention means that, in the case of the disposable diaper 10 housed in the package, the disposable diaper 10 is taken out from the package and placed in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH. It has been left for 24 hours.

The disposable diaper 10 has an anteroposterior direction L and a width direction W orthogonal to each other. The anterior-posterior direction L is defined by the direction extending to the anterior side and the posterior side of the body. In other words, the anteroposterior direction L is a direction extending anterior-posteriorly in the deployed disposable diaper 10. Further, the disposable diaper 10 has both the front-rear direction L and the width direction W orthogonal to each other in the thickness direction T. The thickness direction T extends to the skin surface side T1 facing the wearer side and the non-skin surface side T2 opposite to the skin surface side.

The disposable diaper 10 has a front waist circumference area S1, a rear waist circumference area S2, and an inseam area S3. The front waist circumference area S1 is a region facing the front waist circumference (abdomen) of the wearer. The rear waist circumference area S2 is a region facing the rear waist circumference (back) of the wearer, and includes a region on which the body (buttocks) is placed when worn. The inseam area S3 is located in the inseam of the wearer and is an area arranged between the front waist area S1 and the rear waist area S2. The inseam area S3 is an area provided with a leg circumference opening arranged around the wearer's leg circumference. The leg circumference opening is a portion recessed inward in the width direction from the outer edge of the disposable diaper.

The disposable diaper 10 includes an absorbent core 31 containing an absorbent material. The absorbent core 31 contains an absorbent material such as ground pulp or a highly absorbent polymer (SAP), or a mixture thereof. The absorption core 31 may be covered by a core wrap 32. The absorber 30 may be composed of the absorption core 31 and the core wrap 32. The core wrap 32 is composed of a tissue and may be arranged on the skin surface side T1 of the absorption core 31 and the non-skin surface side of the absorption core.

As shown in FIGS. 1 and 3, a surface sheet 21 and a side sheet 22 may be provided on the skin surface side T1 of the absorber 30 including the absorption core 31. The surface sheet 21 may be arranged so as to straddle the center of the absorber 30 in the width direction W. The side sheet 22 may be arranged so as to cover the outer side portion of the surface sheet 21. The surface sheet 21 and the side sheet 22 may be made of a liquid-permeable sheet such as a non-woven fabric or a perforated plastic film. The inner portions of the side seats 22 may be folded back and overlapped. A leak-proof expansion / contraction portion 43 that expands / contracts in the front-rear direction L may be provided between the overlapping side sheets 22. The leak-proof expansion / contraction portion 43 may be composed of a thread rubber that expands / contracts in the front-rear direction L. The side sheet 22 and the leak-proof expansion / contraction portion 43 form a leak-proof gather 60 that stands up on the skin surface side T1 when worn.

The back surface sheet 23 and the exterior sheet 24 may be provided on the non-skin surface side T2 of the absorber 30. The exterior sheet 24 may be provided on the non-skin surface side T2 of the back surface sheet 23. The length of the back surface sheet 23 in the width direction W is shorter than the length of the exterior sheet 24 in the width direction W, and the length of the back surface sheet 23 in the front-rear direction L is shorter than the length of the exterior sheet 24 in the front-rear direction L. The back sheet 23 may be made of a liquid-impermeable film. The exterior sheet 24 may be made of a liquid-permeable non-woven fabric.

A fastening tape 91 is provided on the outer side of the rear waist circumference region. The fastening tape 91 has a base portion 92 and an engaging portion 93. The base portion 92 is arranged between the exterior sheet 24 and the side sheet 22 in the thickness direction T, and extends outward from the exterior sheet 24 and the side sheet 22 in the width direction W. The engaging portion 93 is arranged on the base portion 92 and engages with the target portion 95 (see FIG. 5). The target portions 95 are arranged at intervals in the width direction in the front waist circumference region S1, and are configured so that the fastening tapes 91 are respectively fixed.

An indicator 51 may be arranged between the back sheet 23 and the absorber 30. The indicator 51 may extend in the front-rear direction L and may be arranged at intervals in the width direction W. The indicator 51 is arranged between the low basis weight portions 33, which will be described later. The indicator 51 is configured so that the absorber discolors when it absorbs the body fluid, and the absorption state of the body fluid can be grasped from the non-skin surface side T2 of the disposable diaper 10.

The disposable diaper 10 may have a leg circumference expansion / contraction portion 42 that expands / contracts in the front-rear direction on the outer side in the width direction from the absorption core 31. The leg circumference expansion / contraction portion 42 may be provided between the side sheet 22 and the back surface sheet 23, and between the side sheet 22 and the exterior sheet 24. The leg circumference expansion / contraction portion 42 is composed of a band-shaped expansion / contraction sheet that expands / contracts in the front-rear direction L. Due to the contraction of the leg circumference expansion / contraction portion 42, the leg circumference opening of the disposable diaper 10 fits around the leg circumference when worn.

The disposable diaper 10 may have a waist elastic portion 45 extending in the width direction W along the trailing edge of the disposable diaper. The waist elastic portion 45 may be provided between the back surface sheet 23 and the exterior sheet 24, between the front surface sheet 21 and the exterior sheet 24, and between the side sheet 22 and the exterior sheet 24. The posterior edge of the hip stretch 45 may be located anterior to the posterior edge of the disposable diaper, and the front edge of the waist stretch 45 may be located anterior to the posterior edge of the absorption core 31. The waist elastic portion 45 may extend outward in the width direction W from the absorption core 31. The waist elastic portion 45 is composed of a band-shaped elastic sheet that expands and contracts in the width direction W.

The disposable diaper 10 may have a pair of inseam telescopic portions 41 provided in a region overlapping the absorption core 31 in the inseam region. The inseam expansion / contraction portion 41 is arranged on the non-skin surface side of the absorption core 31. The inseam expansion / contraction portion 41 may be provided between the back surface sheet 23 and the exterior sheet 24. The inseam expansion / contraction portion 41 extends in the front-rear direction L and is arranged at intervals in the width direction W. The inseam expansion / contraction portion 41 is not arranged at the center of the absorption core 31 in the width direction W, but is arranged on each side of the absorption core 31 with respect to the center of the width direction W. Therefore, due to the contraction of the inseam expansion / contraction portion 41, the absorption core in the region overlapping the inseam expansion / contraction portion 41 is pulled up toward the body side from the center in the width direction of the absorption core. The pair of inseam telescopic portions 41 may be located inside the outer edge of the absorption core 31 in the width direction. The region located between the pair of inseam telescopic portions 41 is pulled up toward the body with respect to the region outside the width direction of the pair of inseam telescopic portions 41. Therefore, the center in the width direction of the absorption core is deformed convexly with the side portion as the base point, and the fit to the crotch of the body can be ensured. The inseam expansion / contraction portion 41 is composed of thread rubber arranged along the front-rear direction L. In another form, the inseam expansion / contraction portion 41 may be composed of a band-shaped expansion / contraction sheet that expands / contracts in the front-rear direction, may be composed of one thread rubber, or may be composed of three or more thread rubbers. It may be configured. Further, in the present invention, the overlapping state is a state in which one member and the other member are overlapped in a plan view, and the other member is arranged on the skin surface side or the non-skin surface side of one member. It is in a state of being. The overlapping state includes not only a state in which one member and the other member are in contact with each other, but also a configuration in which another member is interposed between one member and the other member.

The inseam telescopic portion 41 may straddle the center 10LC in the front-rear direction of the disposable diaper. By contracting the inseam telescopic portion 41, the center 10LC of the disposable diaper in the anteroposterior direction can be pulled up toward the body. In particular, if the disposable diaper is folded in two so that the skin sides of the disposable diaper face each other before use, the folding habit can be improved. In another form, the inseam telescopic portion 41 may be arranged only on the front side of the center 10LC without straddling the center 10LC in the front-back direction of the disposable diaper, or only on the rear side of the center 10LC. It may be arranged in.

The inseam expansion / contraction portion 41 is located inside the width direction W with respect to the outer edge of the absorption core 31. A region where the contraction force of the inseam expansion / contraction portion 41 is difficult to act is provided on the outside of the inseam expansion / contraction portion 41 of the absorption core 31 in the width direction W. FIG. 3 shows a side region R31 located outside the inseam expansion / contraction portion 41 in the absorption core 31 and a central region R32 between the side regions R31. The side region R31 is a region located outside the width direction W with respect to the inseam expansion / contraction portion 41 located most outside the width direction W. The central region R32 is a region including a region overlapping the inseam expansion / contraction portion 41 and a region located inside the inseam expansion / contraction portion 41 in the width direction W. The central region R32 is pulled up toward the body with respect to the side region R31 by the contraction of the inseam expansion / contraction portion 41. The deformation mode of the absorption core 31 when worn will be described in detail later.

Further, in the elastic portion including the leak-proof elastic portion 43, the leg circumference elastic portion 42, the waist elastic portion 45, and the inseam elastic portion 41 in the present invention, the elastic member such as the thread rubber or the elastic sheet can be expanded and contracted. It is an arranged part and does not include a part where an elastic member is arranged in a non-expandable state. That is, the stretchable portion is an effective length portion of the elastic member constituting the stretchable portion.

(3) Configuration of Absorption Core Next, the configuration of the absorption core 31 will be described in detail with reference to FIG. 2. The absorption core 31 has a narrow portion 35 having a length shorter in the width direction than the maximum width 31M of the absorption core 31, and a wide portion arranged outside the narrow portion 35 in the front-rear direction. The narrow portion 35 is arranged between the wide portions arranged in the front-rear direction. The length of the narrow portion 35 in the width direction becomes longer toward the outside of the front-rear direction L. The shape of the absorption core 31 in a plan view is an hourglass shape. The shape of the absorber including the core wrap as well as the absorption core 31 may be an hourglass shape.

The absorption core 31 may have a low basis weight portion 33 in which the basis weight of the absorption material is lower than that of the surrounding area. The low basis weight portion 33 is provided along the front-rear direction L. The low basis weight portion 33 may extend in the front-rear direction L, may be parallel to the front-rear direction L, or may be inclined at an angle of less than 90 degrees with respect to the front-rear direction L.

The low basis weight portion 33 is a portion having a lower basis weight of the absorption material than the surrounding absorption core 31, is thinner than the surrounding absorption core 31, and has lower rigidity. Therefore, the low basis weight portion 33 tends to be a deformation base point in the mounted state. The absorption core 31 is likely to have a deformation base point extending in the front-rear direction L when worn. The low basis weight portion 33 may be a portion where the basis weight of the absorbent material is substantially zero (the design basis weight is 0, but includes a portion where the surrounding absorbent material is mixed), or the periphery. It may be a portion where an absorbent material having a smaller basis weight is arranged. The low basis weight portion 33 may be a slit having a constant length in the width direction W, or may be a notch in which the length in the width direction W is practically zero. The length of each low basis weight portion 33 in the width direction W may be 2 mm or more and 10 mm or less, and more preferably, the thickness of the absorption core 31 or more and 8 mm or less. When the length of the low basis weight portion 33 in the width direction is equal to or larger than the thickness of the absorption core 31, the absorption core 31 is easily deformed in the thickness direction with the low basis weight portion 33 as the base point. Further, since the length of the low basis weight portion 33 in the width direction is 8 mm or less, it is possible to suppress anxiety about the absorption performance due to the long length of the low basis weight portion in the width direction. The length of the low basis weight portion 33 in the front-rear direction L may be 30 mm or more and 180 mm or less.

The low basis weight portions 33 are arranged in pairs at intervals in the width direction W. The low basis weight portions 33 may be arranged on both sides of the center 10WC in the width direction of the disposable diaper at intervals in the width direction W. The center of the low basis weight portion 33 in the front-rear direction L may be arranged behind the center 10LC of the front-back direction L of the disposable diaper. The front end edge 33F of the low basis weight portion 33 may be located on the front side of the front end edge 41F of the inseam expansion / contraction portion 41, and the rear end edge 33R of the low basis weight portion 33 is the rear end edge 41R of the inseam expansion / contraction portion 41. It may be located anterior to the coincidence or trailing edge 41R. The outer edge of the low basis weight portion 33 may coincide with the thread rubber located outside in the width direction among the thread rubbers constituting the inseam expansion / contraction portion 41 in the width direction, and the inner edge of the low basis weight portion 33 may be aligned with the thread rubber. Of the thread rubbers constituting the inseam expansion / contraction portion 41, the thread rubber located inside in the width direction may coincide with the thread rubber in the width direction.

The absorption core 31 may have a high-rigidity portion 70 having a higher rigidity than the surrounding region. The high-rigidity portion 70 includes a central high-rigidity portion 71 arranged between the pair of inseam expansion / contraction portions 41, a rear high-rigidity portion 72 arranged behind the inseam expansion / contraction portion 41, and an inseam expansion / contraction portion 41. It may have a front high-rigidity portion 73 arranged on the front side. The central high-rigidity portion 71, the rear high-rigidity portion 72, and the front high-rigidity portion 73 are separated from each other in the front-rear direction L.

The high-rigidity portion 70 is a region having higher bending rigidity than the surrounding region. The high-rigidity portion 70 may be a portion having a higher basis weight than the surrounding region, or may be a portion where the absorption core 31 is compressed in the thickness direction. The high-rigidity portion 70 of the present embodiment is a portion provided with a compressed portion in which the absorption core 31 is compressed. The squeezed portion may be formed by squeezing at least the absorption core 31 in the thickness direction T, and may be formed by squeezing another member such as the core wrap 32 and the absorption core 31.

The central high-rigidity portion 71 is provided in the region between the pair of low basis weight portions 33. The front end edge 71F of the central high-rigidity portion 71 may coincide with the front end edge 33F of the low basis weight portion 33 or may be located on the rear side of the front end edge 33F of the low basis weight portion 33. The rear end edge 71R of the central high-rigidity portion 71 may be located on the front side of the rear end edge 33R of the low basis weight portion 33. The center in the front-rear direction of the central high-rigidity portion 71 may be arranged in front of the center in the front-rear direction of the low basis weight portion 33. The central high-rigidity portion 71 may be arranged at a distance from the low basis weight portion 33 in the width direction W. The central high-rigidity portion 71 may straddle the center 10LC in the front-rear direction of the disposable diaper and the center 10WC in the width direction W of the disposable diaper.

The inseam expansion / contraction portion 41 may be located on both sides of the center of the central high-rigidity portion 71 in the width direction, and may extend to the rear side of the central high-rigidity portion 71. In the absorption core 31, the first region R41 in which the inseam expansion / contraction portion 41 is arranged behind the central high-rigidity portion 71, and the central high-rigidity portion 71 and the inseam expansion / contraction portion 41 overlap each other in the thickness direction or the width direction. It may have two regions R42 and a third region R43 in which the central high-rigidity portion 71 is arranged on the front side of the inseam expansion / contraction portion 41. The first region R1 and the second region R42 are adjacent to each other in the front-rear direction L, and the second region R42 and the third region R43 are adjacent to each other in the front-back direction L. The trailing edge of the first region R41 coincides with the trailing edge 41R of the inseam telescopic portion 41, and the front edge of the first region R41 coincides with the trailing edge 71R of the central high-rigidity portion 71. The trailing edge of the second region R42 coincides with the front edge of the first region R41, and the front edge of the second region R42 coincides with the front edge 41F of the inseam telescopic portion 41. The trailing edge of the third region R43 coincides with the front edge of the second region R42, and the front edge of the third region R43 coincides with the front edge 71F of the central high-rigidity portion 71.

The rear high rigidity portion 72 may be arranged on the rear side of the pair of low basis weight portions 33. The outer edge of the rear high-rigidity portion 72 may extend outward in the width direction W toward the rear side. The length of the front end edge of the rear high-rigidity portion 72 in the width direction W may be longer than the length of the central high-rigidity portion 71 in the width direction W. The rear high-rigidity portion 72 may straddle the center 10WC of the width direction W of the disposable diaper. The rear high-rigidity portion 72 constitutes the "high-rigidity portion" of the present invention. The rear high rigidity portion 72 is formed from the inner extension line 33IL extending in the front-rear direction L from the end edge of the front-rear direction L at the inner edge of the low basis weight portion 33 and the end edge of the front-rear direction L at the outer edge of the low basis weight portion 33. It straddles the outer extension line 33EL extending in the front-rear direction L. That is, the rear high-rigidity portion 72 is arranged over the entire width direction of the region extending rearward from the rear end edge of the low basis weight portion 33. The inner edge and the outer edge of the low basis weight portion 33 refer to edges extending in the front-rear direction L. When a part of the side edge of the low basis weight portion has a sharp shape, it is the edge of the portion excluding the sharp shape.

The front high-rigidity portion 73 may be arranged on the front side of the low basis weight portion 33. The front high-rigidity portions 73 may be arranged on both sides of the center 10WC of the width direction W of the disposable diaper at intervals in the width direction W. The front high-rigidity side edge 73X, which is the front end edge of the front high-rigidity portion 73, may extend forward toward the outside in the width direction W. The front high-rigidity portion 73 constitutes the "high-rigidity portion" of the present invention. The front high-rigidity portion 73 straddles the inner extension line 33IL and the outer extension line 33EL. That is, the front high-rigidity portion is arranged in the entire width direction of the region extending forward from the front end edge of the low basis weight portion 33. In the modified example, the front high-rigidity portion 73 may be continuously formed in the width direction like the rear high-rigidity portion.

The absorption core 31 may have a pair of deformation base points 85 provided behind the inseam expansion / contraction portion 41. The deformation base point portions 85 are arranged in pairs on the rear side of the inseam expansion / contraction portion 41 so as to extend toward the rear side toward the outside of the width direction W and at intervals in the width direction W. The deformation base point portion 85 serves as a base point at which the absorption core 31 is deformed in the thickness direction T. The deformation base point portion 85 of the present embodiment is composed of the outer portion 72S of the rear high rigidity portion 72. The deformation base point portion 85 has a base point edge 85E which is an edge of the deformation base point. The base point edge is an edge on which a polygonal line having the thickness of the absorption core 31 is formed. The base point edge 85E of the present embodiment is the outer edge 72E of the rear high rigidity portion 72. The modified base point portion 85 of the present embodiment includes a region extending inward in the direction perpendicular to the line along the base point edge 85E from the base point edge 85E to the thickness of the absorption core 31.

Here, the outer portion in the present invention is a portion that occupies a certain range in the width direction W including the outer edge in the width direction W, and the outer edge is the outer edge in the width direction W. The inner portion is a portion that occupies a certain range in the width direction W including the inner edge in the width direction W, and the inner edge is an inner edge in the width direction W. The deformation base point portion 85 may be a base point at which the absorption core 31 is deformed in the thickness direction, and is not limited to the outer portion of the high-rigidity portion by the squeezing portion.

(4) Disposable diaper wearing state Next, the wearing state of the disposable diaper 10 will be described with reference to FIGS. 6 to 8. FIG. 6 is a diagram schematically showing a wearing state of a disposable diaper in the AA cross section. FIG. 7 is a diagram for explaining a deformation mode of the absorber 30 at the time of wearing in the BB cross section of the disposable diaper. FIG. 8 is a diagram schematically showing a wearing state of a disposable diaper according to an embodiment, and is a view of a sleeping wearer visually recognized from the front side. The line BL shown in FIG. 6 shows the line of the wearer's body.

When a disposable diaper is worn, a force is applied to the absorption core 31 of the inseam area S3 toward the inside of the skin surface side T1 and the width direction W by pulling up when wearing the diaper or being pinched by the wearer's legs. The absorption core 31 of the inseam region S3 is deformed from the low basis weight portion extending in the front-rear direction L when worn. The absorbent core deforms in the thickness direction, making it easier to fit in the wearer's crotch.

At this time, since the rear high-rigidity portion 72 and the front high-rigidity portion 73 are provided straddling the inner extension line 33IL and the outer extension line 33EL, deformation by the low basis weight portion 33 is caused as shown in FIG. It can be divided by the rear high rigidity portion 72 and the front high rigidity portion 73. It is possible to suppress the formation of a deformation base point by the low basis weight portion 33 over the entire area of the absorption core 31 in the anteroposterior direction L, and to suppress the formation of a gap between the buttocks and the disposable diaper and a gap between the abdomen and the disposable diaper. .. Therefore, while deforming the absorbent core along the crotch of the body, the absorbent core can be aligned with the buttocks and abdomen of the wearer to suppress leakage. Further, the low basis weight portion 33, which is the deformation base point of the absorption core 31, has a lower basis weight than the surrounding region, can suppress the thickness even after absorbing the body fluid, and can maintain the deformed state.

In the present embodiment, the rear high-rigidity portion 72 and the front high-rigidity portion 73 straddling the inner extension line 33IL and the outer extension line 33EL are provided, but the rear high-rigidity portion 72 and the front high-rigidity portion 73 are provided. Either one of them may straddle the inner extension line 33IL and the outer extension line 33EL. Either the rear high-rigidity portion 72 or the front high-rigidity portion 73 can reduce the gap with respect to the abdomen or the gap with respect to the buttocks, and can suppress leakage.

The rear high-rigidity portion 72 may have a rear high-rigidity side edge 72X that intersects at least one of the outer extension line 33EL and the inner extension line 33IL. The rear high-rigidity side edge 72X of the present embodiment is the outer edge 72E of the rear high-rigidity portion 72, and also constitutes the base point edge 85E of the deformation base point portion. The side edge extension line 72EL extending along the rear high rigidity side edge 72X may intersect the outer edge 31E of the absorption core 31. Further, the front high-rigidity portion 73 may have a front high-rigidity side edge 73X that intersects with at least one of the outer extension line 33EL and the inner extension line 33IL. The side edge extension line 73EL extending along the front high rigidity side edge 73X may intersect the outer edge 31E of the absorption core 31.

The deformation of the absorption core 31 with the low basis weight portion 33 as the base point extends along the outer extension line 33EL or the inner extension line 33IL, and easily reaches the rear high rigidity side edge 72X. Further, the deformation that reaches the rear high-rigidity side edge 72X extends along the rear high-rigidity side edge 72X and the side edge extension line 73EL. Since the side edge extension line 73EL intersects the outer edge 31E of the absorption core 31, deformation from the inseam region S3 side is likely to be guided to the outer edge 31E of the absorption core 31. It is easier to obtain the effect of dividing the deformation caused by the low basis weight portion 33 by the front high rigidity portion 73 and the rear high rigidity portion 72. In addition, in the region on the front side of the front high-rigidity portion 73 and the region on the rear side of the rear high-rigidity portion 72, the influence of deformation due to the low basis weight portion is reduced, and it is easier to secure the fit to the buttocks and abdomen. Become.

The intersection of the side edge extension line and the outer edge 31E of the absorption core 31 may be located outside the high-rigidity side edge in the front-rear direction L. Specifically, the intersection P1 between the side edge extension line 72EL and the outer edge 31E of the absorption core 31 is located on the rear side of the rear high-rigidity side edge 72X, and the side edge extension line 73EL and the outer edge of the absorption core 31 are located. The intersection P2 with 31E may be located on the front side of the front high-rigidity side edge 73X. According to such a configuration, the deformation caused by the low basis weight portion 33 can be guided to a position away from the crotch. Therefore, it is easier to align the absorption core 31 with at least one of the wearer's buttocks and abdomen while deforming the absorption core 31 along the crotch of the body.

The rear high-rigidity side edge 72X and the front high-rigidity side edge 73X may be inclined with respect to the width direction W. Compared to the configuration in which the rear high-rigidity side edge 72X and the front high-rigidity side edge 73X are parallel to the width direction W, the deformation that reaches the rear high-rigidity side edge 72X and the front high-rigidity side edge 73X is gradually absorbed by the core 31. Guided to the outer edge 31E. The gentle deformation of the absorption core 31 suppresses the formation of unintended irregularities on the absorption core 31, making it easier for the absorption core 31 to fit the body.

The intersection P1 between the outer edge extension line 72EL of the rear high rigidity portion 72 and the outer edge 31E of the absorption core 31 may be arranged outside the narrow portion 35 in the front-rear direction L. Further, the intersection P2 between the side edge extension line 73EL of the front high rigidity portion 73 and the outer edge of the absorption core 31 may be arranged outside the narrow portion 35 in the front-rear direction L. Deformation due to the low basis weight portion 33 can be easily guided to the wide portion. The wide portion is farther from the leg than the narrow portion 35, and is less deformed by the movement of the leg. Therefore, even when the leg moves violently, the shape of the absorption core 31 can be easily maintained, the length of the absorption core 31 in the width direction W can be secured, and the deformation caused by the low basis weight portion 33 can be absorbed. Therefore, even when the deformation base point along the wearer's inguinal region is formed in the absorption core due to the movement of the legs, the deformation along the inguinal region and the deformation due to the low basis weight portion 33 are suppressed from interlocking. However, the length of the absorption core 31 in the width direction can be secured. Therefore, the absorption core can cover the buttocks and abdomen, and leakage can be further suppressed.

The distance L1 between the rear high rigidity portion 72 and the low basis weight portion 33 in the front-rear direction L may be 15 mm or more and 30 mm or less. Further, the distance L2 between the front high rigidity portion 73 and the low basis weight portion 33 in the front-rear direction L may be 15 mm or more and 30 mm or less. When the distance L1 and the distance L2 are 15 mm or more, the deformation of the absorption core 31 by the low basis weight portion 33 does not reach the rear high rigidity portion 72 and the front high rigidity portion 73 as they are, and the deformation is weakened. Easy to reach. Therefore, it is easier to obtain the effect of dividing the deformation of the absorption core 31 by the rear high-rigidity portion 72 and the front high-rigidity portion 73. Further, since the distance L1 and the distance L2 are 30 mm or less, the region where the deformation of the low basis weight portion 33 propagates in the front-rear direction L can be reduced, and the absorption core 31 can be arranged so as to cover the body in a wide range.

The length of the rear high-rigidity portion 72 in the front-rear direction L may be longer than the length of the front high-rigidity portion 73 in the front-rear direction L. Since the length of the rear high-rigidity portion 72 in the front-rear direction L is long, it is easy to suppress deformation of the region with respect to the buttocks and secure a space for accommodating stool. On the other hand, the front high rigidity portion 73 has the effect of dividing the deformation of the low basis weight portion 33. The length of the front high rigidity portion 73 in the front-rear direction L is relatively short, and it is easy to secure the area of the absorption core that covers the front waist circumference region S1.

The center of the low basis weight portion 33 in the front-rear direction L is arranged on the rear side of the center 10LC of the front-rear direction L of the disposable diaper 10, and the center of the rear high rigidity portion 72 and the low basis weight portion 33 in the front-rear direction L. The distance L1 may be shorter than the distance L2 in the front-rear direction L between the front high rigidity portion 73 and the low basis weight portion 33. Since the low basis weight portion 33 is biased to the rear side, the deformation with the low basis weight portion 33 as the base point can be provided on the buttocks side. Further, since the distance L1 in the front-rear direction L between the rear high rigidity portion 72 and the low basis weight portion 33 is relatively short, the absorption core 31 is deformed from the rear high rigidity portion 72 as a base point, and the absorption by the low basis weight portion 33 is absorbed. It becomes easy to interlock with the deformation of the core 31. Therefore, in the inseam region, the absorption core deformed to be closer to the body side makes it easier to cover the buttocks, and on the dorsal side, it can be widely covered along the shape of the buttocks. On the other hand, the distance L2 between the front high rigidity portion 73 and the low basis weight portion 33 in the front-rear direction L is relatively long, and the deformation caused by the low basis weight portion 33 is weakened so that the front high rigidity portion 73 can be easily reached. It is easier to obtain the effect that the deformation caused by the low basis weight portion 33 can be divided by the front high rigidity portion 73.

When the tape-type disposable diaper 10 is attached, first, the wearer's buttocks are placed on the rear waist circumference region S2 of the disposable diaper 10 with the disposable diaper 10 unfolded. Then, a disposable diaper 10 is passed between the wearer's legs, the diaper is pulled toward the inseam region, and the body is covered by the inseam region. At this time, the disposable diaper is pulled in the front-rear direction L, and the absorption core 31 is easily deformed with the deformation base point portion 85 including the rear high rigidity portion 72 as the base point. The deformation base point portion 85 is provided on the rear side of the inseam expansion / contraction portion 41 and the low basis weight portion 33, and the deformation base point of the absorption core 31 is formed on the rear side of the inseam expansion / contraction portion 41 and the low basis weight portion 33. To. The deformation base point portion 85 extends toward the outside in the width direction W toward the rear side, and the absorption core 31 is formed with a deformation base point extending inward in the width direction W from the rear waist circumference area toward the inseam area. To.

Therefore, when the buttocks are placed on the back waist area and the diaper is pulled toward the inseam area, the absorber is deformed by the base point extending inward in the width direction W from the rear waist area toward the inseam area. Specifically, as shown in FIG. 7, the absorber in the region where the deformation base point portion 85 is provided is deformed with the outer edge 72E of the rear high rigidity portion 72 (base point edge 85E of the deformation base point portion 85) as a base point. However, the region inside the width direction W from the outer edge 72E is arranged closer to the skin surface side than the region outside the width direction W than the outer edge 72E. The reason why the region inside the width direction W from the outer edge 72E is arranged on the skin surface side from the region outside the width direction W from the outer edge 72E is that the absorption core 31 is arranged due to the contraction of the inseam expansion / contraction portion 41. The center of the width direction W is pulled up toward the body, and when the wearer pulls the diaper, a force is generally applied to the center of the width direction W of the absorption core 31, and the outer part of the absorbent article (when worn). This is because the center of the absorption core 31 in the width direction W is pulled up while the leg circumference opening (near the leg circumference opening) is caught by the leg. By deforming the absorption core 31 with the deformation base point portion 85 as the base point, the absorption core 31 is deformed so that the length of the width direction W becomes shorter toward the inseam region side. At this time, since the length of the rear high rigidity portion 72 in the front-rear direction L is relatively long, the absorption core 31 can be smoothly folded, an unintended crease is formed, and it is possible to suppress the formation of a gap with respect to the body. ..

As shown in FIGS. 6 and 8, the absorption core 31 located in front of the deformation base point 85 is deformed convexly toward the body due to the contraction of the pair of inseam expansion / contraction portions 41, and the central region R32 is the side region R31. Stand up against. Therefore, the absorption core 31 in the inseam region is arranged along the body side, and the absorption core 31 can be appropriately accommodated in the crotch of the wearer.

The absorption core 31 can be compactly stored in the gap between the wearer's feet while covering the absorption core 31 with a large area for the wearer's buttocks. By placing the disposable diaper in an appropriate position in the wearer's crotch, the anterior girth area can be pulled to a position that covers the wearer's abdomen. The tape-type disposable diaper can properly cover the wearer's body.

Of the front high-rigidity side edge 73X and the rear high-rigidity side edge 72X, at least the rear high-rigidity side edge 72X may extend inward in the width direction toward the inside of the front-rear direction L, and the width direction of the front high-rigidity side edge 73X. The angle with respect to the rear high rigidity side edge 72X may be smaller than the angle with respect to the width direction. Since the angle of the rear high-rigidity side edge 72X with respect to the width direction is relatively large, the absorption core can be deformed so that the length in the width direction of the absorption core becomes short in a short range of the front-rear direction L.

On the other hand, the front waistline area is the area where the rear waistline area and the inseam area are applied to the body at the time of wearing, and then the last area to be applied. Therefore, it is preferable that the front waist circumference area is arranged so as to cover the body in a flat state without providing a deformation base point at the time of wearing. Since the angle of the front high-rigidity side edge 73X with respect to the width direction is relatively small, the deformation due to the low basis weight portion 33 can be gently divided, and the body can be covered by the front waist circumference region in a flat state.

The outer edge of the inseam telescopic portion 41 may be arranged outside the outer edge of the deformation base point portion 85 in the width direction W. However, more preferably, the outer edge of the inseam telescopic portion 41 may be arranged inside the width direction W with respect to the outer edge of the deformation base point portion 85. According to such a configuration, the deformation of the absorption core 31 with the deformation base point portion 85 as the base point and the deformation of the absorption core 31 by the inseam expansion / contraction portion 41 are more easily linked. Therefore, it becomes easier to arrange the absorption core 31 deformed so that the length of the width direction W becomes shorter from the rear waist circumference region toward the inseam region side closer to the body side in the inseam region. The outer edge of the inseam telescopic portion 41 is the outer edge of the elastic member located on the outermost side in the width direction W among the elastic members constituting the inseam telescopic portion 41. The thread rubber constituting the inseam expansion / contraction portion 41 of the present embodiment is arranged along the front-rear direction L, and the elastic member located outside the width direction W constitutes the outer edge of the inseam expansion / contraction portion 41.

The deformation base point portion 85 and the inseam expansion / contraction portion 41 may be displaced in the width direction W. However, more preferably, at least a part of the deformation base point portion 85 may be arranged on an extension line extending from the rear end edge of the inseam expansion / contraction portion 41 to the rear side. The deformation of the absorption core 31 with the deformation base point portion 85 as the base point and the deformation of the absorption core 31 by the inseam expansion / contraction portion 41 are more easily linked. Therefore, it becomes easier to arrange the absorption core 31 deformed so that the length of the width direction W becomes shorter from the rear waist circumference region toward the inseam region side closer to the body side in the inseam region. In the form in which a plurality of elastic members constituting the inseam expansion / contraction portion 41 are provided, the deformation base point portion 85 may be arranged on an extension line of at least one of the elastic members.

The deformation base point portion 85 may straddle the first intermediate line ML1 located in the middle of the front-rear direction L between the center 10LC of the disposable diaper in the front-rear direction L and the front end edge of the engaging portion 93 in the front-rear direction L. As shown in FIG. 1, the first intermediate line ML1 is a line that passes through the center of the front-rear direction L between the center 10LC of the front-back direction L of the disposable diaper and the front end edge of the engaging portion 93 and extends in the width direction W. .. The area behind the first intermediate line ML1 is generally the area on which the buttocks are placed when worn. The deformation base point portion 85 straddles the first intermediate line ML1 in the front-rear direction L, and is arranged from the region where the buttocks of the wearer are placed to the region where the buttocks cannot be placed. At the time of mounting, the area behind the first intermediate line ML1 is pressed by the buttocks, the area where the buttocks are not placed is pulled to the front side, and the absorption core 31 is further deformed with the deformation base point 85 as the base point. easy. Therefore, the absorbent core 31 can be deformed so that the width of the absorbent core 31 is shortened, the disposable diaper can be placed at an appropriate position in the crotch of the wearer, and the wearer's body can be appropriately covered.

Further, the rear end edge 41R of the inseam expansion / contraction portion 41 may be arranged on the front side of the first intermediate line ML1. The rear end edge 41R of the inseam telescopic portion 41 is arranged in an area where the wearer's buttocks cannot be placed. At the time of mounting, the region on the rear side of the first intermediate line ML1 is pressed by the buttocks, and the region on which the buttocks are not placed is pulled to the front side, and the inseam expansion / contraction portion 41 is more easily extended. Therefore, the area where the inseam expansion / contraction portion 41 is arranged is more easily pulled up with respect to the body, and the absorption core 31 can be appropriately accommodated in the crotch of the wearer.

The front end edge of the deformation base point portion 85 may be arranged in front of the second intermediate line ML2 located in the middle of the front-rear direction L between the rear end edge of the deformation base point portion 85 and the rear end edge of the inseam expansion / contraction portion 41. As shown in FIG. 1, the second intermediate line ML2 is a line that passes through the middle of the front-rear direction L between the rear end edge of the deformation base point portion 85 and the rear end edge 41R of the inseam expansion / contraction portion 41 and extends in the width direction W. be. The deformation base point portion 85 is provided over a region of more than half of the region between the rear end edge of the deformation base point portion 85 and the rear end edge of the inseam expansion / contraction portion 41. Therefore, the deformation of the absorption core 31 with the deformation base point portion 85 as the base point and the deformation of the absorption core 31 by the inseam expansion / contraction portion 41 are likely to be linked. Therefore, the absorption core 31 can be easily deformed into a shape along the body from the rear waist circumference region S2 to the inseam region S3, and the absorption core 31 can be compactly arranged in the inseam region while covering the buttocks. Disposable diapers can be placed appropriately in the wearer's crotch to properly cover the wearer's body.

A high-rigidity portion having higher rigidity than the region outside the width direction W of the deformation base point portion 85 may be provided between the pair of deformation base point portions 85. In the present embodiment, the outer portion of the rear high-rigidity portion 72 constitutes the deformation base point portion 85, and the region between the outer portions of the rear high-rigidity portion 72 constitutes the high-rigidity portion of the present configuration. Since the high rigidity portion is provided between the deformation base point portions 85, a rigidity difference occurs between the region outside the width direction W of the deformation base point portion 85 and the region inside the deformation base point portion 85, and the deformation base point portion The absorption core 31 is more easily deformed with 85 as a base point. Therefore, the absorption core 31 is easily deformed so that the length of the width direction W becomes shorter toward the inseam region side, and the absorption core 31 is more easily accommodated in the crotch of the wearer. By placing the disposable diaper in an appropriate position in the wearer's crotch, the wearer's body can be properly covered.

In the deformation base point portion having a relatively low rigidity, the rigidity of the high rigidity portion between the pair of deformation base point portions 85 may be higher than the rigidity of the deformation base point portion.

The high-rigidity portion between the pair of deformation base points 85 may be adjacent to the deformation base point 85 in the width direction W. The region outside the deformation base point portion W in the width direction W is more likely to be deformed with respect to the region between the deformation base point portions 85, and the absorption core 31 is more likely to be deformed due to the difference in rigidity. Further, the pair of deformation base points 85 are integrated by the high rigidity portion. The deformation base point portion 85 and the high-rigidity portion are integrated and easily deformed in a convex shape toward the wearer side, so that the absorption core 31 can be more easily accommodated in the wearer's crotch.

The high-rigidity portion between the deformation base point portion 85 and the deformation base point portion 85 of the present embodiment is composed of a rear high-rigidity portion 72 composed of a squeezed portion. As described above, the deformation base point portion 85 and the high rigidity portion may be formed integrally, and the boundary between the deformation base point portion 85 and the high rigidity portion may not be formed. The entire rear high-rigidity portion 72 may exhibit the function as the deformation base point portion 85 and the function as the high-rigidity portion. Further, the deformation base point portion 85 formed of the squeezed portion has high rigidity, and the deformation of the absorption core 31 becomes easier to stabilize.

The pair of deformation base points 85 are arranged so as to sandwich the center of the width direction W of the disposable diaper, and at least a part of the deformation base point portion 85 is the center of the width direction W of the absorption core 31 and the maximum width of the absorption core 31. It may be arranged outside the width direction W from the third intermediate line ML3 located in the middle of. As shown in FIG. 1, the third intermediate line ML3 is a line that passes through the center of the width direction W of the absorption core 31 and the center of the maximum width of the absorption core 31 and extends in the front-rear direction L. In a region of half or more of the width direction W of the absorption core 31, the absorption core 31 is easily deformed with the deformation base point portion 85 as the base point. The absorption core 31 is easily deformed so that the length of the width direction W becomes shorter toward the inseam region side in a wide range of the absorption core 31, and the absorption core 31 is more easily accommodated in the crotch of the wearer.

The leg circumference expansion / contraction portion 42 may be arranged on the extension line EL2 extending outward in the width direction W from the deformation base point portion 85. The extension line EL2 is a line extending outward in the width direction W from an arbitrary position of the deformation base point portion 85, and is provided at a plurality of positions where the positions of the front-rear direction L are different. It suffices that at least a part of the leg rotation expansion / contraction portion 42 is arranged on any of the extension lines EL2. When the buttocks are placed on the back waist area and the diaper is pulled toward the inseam area, the rear waist area is pressed by the buttocks, and the area outside the width direction W of the absorption core 31 is in close contact with the legs. Since the absorption core 31 is deformed while the leg circumference expansion and contraction portion and the buttocks are fitted to the body, the central region R32 easily rises with respect to the side region R31 on the front side of the buttocks, and the absorption core 31 deforms the deformation base point portion 85. It becomes easier to deform as a base point.

Further, the leg circumference expansion / contraction portion 42 may be arranged on an extension line extending outward in the width direction W from the inseam expansion / contraction portion 41. By deforming the absorption core 31 in a state where the elastic portion around the legs fits the body, the central region R32 becomes easier to stand up with respect to the side region R31. The contraction of the inseam expansion / contraction portion 41 makes it easier for the absorption core 31 to be pulled up toward the wearer.

The leg around extension / contraction portion 42 may extend toward the rear side toward the outside in the width direction W. The leg-rotating elastic portion extending outward in the width direction W toward the rear side is in close contact with the body, so that the wearer's buttocks can be covered with a disposable diaper. The absorption core 31 can be deformed so that the length of the absorption core 31 in the width direction W becomes shorter toward the inseam region while covering the buttocks in a wide range toward the rear side. While properly fitting the absorbent core 31 in the crotch of the wearer, the disposable diaper can cover the entire body and prevent leakage.

Outside the absorption core 31 in the width direction W, the side flap portion 27 extending toward the rear side toward the outside in the width direction W may be provided, and the side flap portion 27 may be arranged on the extension line EL2. The side flap portion 27 is a portion of the outer portion of the disposable diaper that extends toward the rear side toward the outside in the width direction W, and is a portion shown with diagonal lines in FIG. When the buttocks are placed on the rear waist area and the diaper is pulled toward the inseam area, the rear waist area is pressed by the buttocks, and the side flaps on the outer side in the width direction W are more likely to hit the legs than the absorption core 31. Therefore, the absorption core 31 is deformed in a state where the side flap portion located outside in the width direction W and the region on which the buttocks are placed are held down, and the absorption core 31 is more easily deformed with the deformation base point portion 85 as the base point.

The inseam telescopic portion 41 may be arranged on both sides in the width direction W with respect to the central high-rigidity portion 71. By the contraction of the inseam expansion / contraction portion 41, the region outside the width direction W can be pulled up toward the body side from the central high-rigidity portion 71. Therefore, the vicinity of the low basis weight portion 33 is likely to be deformed in a convex shape toward the body side. Further, the central high-rigidity portion 71 is difficult to contract due to the inseam expansion / contraction portion 41. Therefore, it is possible to secure an absorption area, maintain a convex shape along the crotch, and reduce leakage.

The low basis weight portion 33 may be arranged in the area overlapping the inseam expansion / contraction portion 41. The absorption core 31 is deformed with the low basis weight portion 33 extending in the front-rear direction L as a base point when worn. Therefore, the absorption core 31 is more likely to be deformed in a convex shape toward the body due to the contraction of the inseam expansion / contraction portion 41, and the absorption core 31 can be appropriately accommodated in the crotch of the wearer.

(5) Modification Example Next, the absorption core according to the modification will be described. FIG. 9 is a diagram schematically showing the plane of the absorption core 31 having the high rigidity portion according to the modified example. In the following description of the modified example, only the configuration different from the above-described embodiment will be described, and the description of the same configuration as that of the embodiment will be omitted by using the same reference numerals.

FIG. 9A shows an absorption core 31A having a rear high rigidity portion 72A according to the first modification. The rear high-rigidity portions 72A are arranged in pairs on both sides of the center 10WC in the width direction of the disposable diaper at intervals in the width direction W. The rear high-rigidity portion 72A is not continuous in the width direction but is separated in the width direction, and it is easy to secure the body fluid absorption performance by the region between the rear high-rigidity portions 72A. In addition, in the form in which the squeezed portion is formed in the rear high-rigidity portion 72A, the squeezed portion is not formed in the region between the rear high-rigidity portions 72A. Therefore, the absorption core 31 can easily maintain its softness without becoming too hard.

The intersection P1 between the side edge extension line 73EL and the outer edge 31E of the absorption core 31 may be arranged in the narrow portion 35. Deformation due to the low basis weight portion 33 can be guided to the narrow portion 35, and deformation in the wide portion, which is the maximum width region of the absorption core 31, can be suppressed. The wide part can cover the buttocks and abdomen, and leakage can be further suppressed.

FIG. 9B shows an absorption core 31B having a rear high rigidity portion 72B and a low basis weight portion 33B according to the second modification. The low basis weight portion 33B is curved rather than along the front-rear direction L. The inner extension line 33IL in such a low basis weight portion 33 is a line extending along the front-rear direction L from the end edge of the front-rear direction L at the inner edge extending in the front-rear direction L. Similarly, the outer extension line 33EL is a line extending along the front-rear direction L from the end edge of the front-rear direction L at the outer edge extending in the front-rear direction L. The rear high-rigidity side edge 72X of the rear high-rigidity portion 72B extends along the width direction W.

FIG. 9C shows an absorption core 31C having a rear high rigidity portion 72C according to the third modification. The rear high-rigidity side edge 72X of the rear high-rigidity portion 72C extends inward in the front-rear direction L toward the outside in the width direction. Therefore, the intersection P1 between the side edge extension line 72EL and the outer edge 31E of the absorption core 31 is located inside the high-rigidity side edge 72X in the front-rear direction L.

The measurement of the "basis weight of the absorption core" in the present specification shall be performed by the following measurement method. If the disposable diaper 10 is enclosed in a package or the like, use a sample that has been taken out of the package and left in that state for 12 hours in an atmosphere of 20 ° C ± 2 ° C and a relative humidity of 60% ± 5% RH. For disposable diapers wrapped with a wrapping sheet or the like, the wrapping sheet is opened and the folded disposable diaper is unfolded. Next, the part for measuring the basis weight is cut out from the disposable diaper, and the part other than the absorption core such as the surface sheet is removed from the cut out part. Then, the area and weight of the portion for measuring the basis weight of the absorption core are measured. Calculate the basis weight based on the weight and area.

The "flexural rigidity" in the present specification may be a value measured by Garley rigidity and softness. The garley stiffness and softness can be measured in accordance with JIS-L1096 using a No. 311 garley type flexibility tester manufactured by Yasuda Seiki Seisakusho Co., Ltd. The length W in the width direction of the sample for measuring the Gurley stiffness and softness can be 30 mm, and the length in the anteroposterior direction can be 25 mm.

Although the present invention has been described in detail using the above-described embodiments, it is clear to those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modifications and modifications without departing from the spirit and scope of the present invention as determined by the description of the scope of claims. Therefore, the description of the present specification is for the purpose of exemplary explanation and does not have any limiting meaning to the present invention.

According to the present invention, it is possible to provide a disposable diaper capable of suppressing leakage by deforming the absorbent core along the crotch of the body and arranging the absorbent core along the portion other than the crotch of the wearer.

10 Disposable diaper 10LC: Center in the front-back direction of the diaper 10WC: Center in the width direction of the diaper 21 Front sheet 22 Side sheet 23 Back sheet 24 Exterior sheet 27 Side flap part 30 Absorber 31 Absorbent core 32 Core wrap 33 Low basis weight part 33IL Inside Extension line 33EL Outer extension line 35 Narrow part 41 Inseam expansion and contraction part 42 Leg circumference expansion and contraction part 43 Leakage prevention expansion and contraction part 45 Waist circumference expansion and contraction part 51 Indicator 71 Central high rigidity part 72 Rear high rigidity part 72EL Side edge extension line 73 Front high rigidity Part 73 EL Side edge extension line 85 Deformation base point part 91 Fastening tape 92 Base part 93 Engaging part 95 Target part ML1: First intermediate line ML2: Second intermediate line ML3: Third intermediate line S1 Front waist circumference area S2 Rear waist circumference area S3 Inseam area T Thickness direction T1 Skin surface side T2 Non-skin surface side L Front-back direction W Width direction

Claims (7)

In the front-back direction and width direction that are orthogonal to each other,
The front waist area, the rear waist area, and the inseam area arranged between the front waist area and the rear waist area, and the inseam area.
With at least an absorption core located in the inseam area,
A disposable diaper in which a pair of low basis weight portions extending in the anteroposterior direction and arranged at intervals in the width direction are formed on the absorption core in the inseam region.
The absorption core is provided with a high-rigidity portion having a higher rigidity than the surrounding region.
The high-rigidity portion includes an inner extension line extending in the anteroposterior direction from the anterior-posterior end edge on the inner edge of the low basis weight portion, and the anterior-posterior end line on the outer edge of the low basis weight portion. It straddles the outer extension line that extends in the direction ,
The high-rigidity portion has a high-rigidity side edge that intersects at least one of the outer extension line and the inner extension line.
The side edge extension line extending along the highly rigid side edge intersects the outer edge of the absorption core and
A disposable diaper whose intersection point between the side edge extension line and the outer edge of the absorption core is located outside the high-rigidity side edge in the anteroposterior direction . The absorption core has a narrow portion whose length in the width direction is shorter than the maximum width of the absorption core.
The disposable diaper according to claim 1 , wherein the intersection of the side edge extension line and the outer edge of the absorption core is arranged in the narrow portion. In the front-back direction and width direction that are orthogonal to each other,
The front waist area, the rear waist area, and the inseam area arranged between the front waist area and the rear waist area, and the inseam area.
With at least an absorption core located in the inseam area,
A disposable diaper in which a pair of low basis weight portions extending in the anteroposterior direction and arranged at intervals in the width direction are formed on the absorption core in the inseam region.
The absorption core is provided with a high-rigidity portion having a higher rigidity than the surrounding region.
The high-rigidity portion includes an inner extension line extending in the anteroposterior direction from the anterior-posterior end edge on the inner edge of the low basis weight portion and the anterior-posterior end line on the outer edge of the low basis weight portion. It straddles the outer extension line that extends in the direction,
The high-rigidity portion has a high-rigidity side edge that intersects at least one of the outer extension line and the inner extension line.
The side edge extension line extending along the highly rigid side edge intersects the outer edge of the absorption core and
The absorption core has a narrow portion whose length in the width direction is shorter than the maximum width of the absorption core.
A disposable diaper in which the intersection of the side edge extension line and the outer edge of the absorption core is arranged outside the narrow portion in the anteroposterior direction. In the front-back direction and width direction that are orthogonal to each other,
The front waist area, the rear waist area, and the inseam area arranged between the front waist area and the rear waist area, and the inseam area.
With at least an absorption core located in the inseam area,
A disposable diaper in which a pair of low basis weight portions extending in the anteroposterior direction and arranged at intervals in the width direction are formed on the absorption core in the inseam region.
The absorption core is provided with a high-rigidity portion having a higher rigidity than the surrounding region.
The high-rigidity portion includes an inner extension line extending in the anteroposterior direction from the anterior-posterior end edge on the inner edge of the low basis weight portion and the anterior-posterior end line on the outer edge of the low basis weight portion. It straddles the outer extension line that extends in the direction,
The high-rigidity portion has a front high-rigidity portion arranged on the front side of the low basis weight portion and a rear high-rigidity portion arranged on the rear side of the low basis weight portion.
The center of the low basis weight portion in the anteroposterior direction is arranged behind the center of the disposable diaper in the anteroposterior direction.
A disposable diaper in which the distance between the rear high-rigidity portion and the low basis weight portion in the front-rear direction is shorter than the distance between the front high-rigidity portion and the low basis weight portion in the front-rear direction. In the front-back direction and width direction that are orthogonal to each other,
The front waist area, the rear waist area, and the inseam area arranged between the front waist area and the rear waist area, and the inseam area.
With at least an absorption core located in the inseam area,
A disposable diaper in which a pair of low basis weight portions extending in the anteroposterior direction and arranged at intervals in the width direction are formed on the absorption core in the inseam region.
The absorption core is provided with a high-rigidity portion having a higher rigidity than the surrounding region.
The high-rigidity portion includes an inner extension line extending in the anteroposterior direction from the anterior-posterior end edge on the inner edge of the low basis weight portion and the anterior-posterior end line on the outer edge of the low basis weight portion. It straddles the outer extension line that extends in the direction,
The high-rigidity portion has a front high-rigidity portion arranged on the front side of the low basis weight portion and a rear high-rigidity portion arranged on the rear side of the low basis weight portion.
With the fastening tape arranged in the rear waist circumference area,
The front high-rigidity portion has a front high-rigidity side edge that intersects at least one of the outer extension line and the inner extension line.
The rear high-rigidity portion has a rear high-rigidity side edge that intersects at least one of the outer extension line and the inner extension line.
Of the front high-rigidity side edge and the rear high-rigidity side edge, at least the rear high-rigidity side edge extends inward in the width direction toward the inside in the front-rear direction.
A disposable diaper in which the angle of the front high-rigidity side edge with respect to the width direction is smaller than the angle of the rear high-rigidity side edge with respect to the width direction. The disposable diaper according to claim 4 , wherein the length of the rear high-rigidity portion in the front-rear direction is longer than the length of the front high-rigidity portion in the front-rear direction. The disposable diaper according to any one of claims 1 to 6 , wherein the distance between the high rigidity portion and the low basis weight portion in the front-rear direction is 15 mm or more and 30 mm or less.

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