Pants type absorbent articles

Abstract

The present invention provides a shorts-type absorbent article, comprising an absorbent body including a longitudinally long absorbent core and an outer body joined to the non-skin surface side of the absorbent body, including a waist opening through which the wearer's waist passes and a pair of left and right leg openings through which the wearer's legs pass, as well as a front body portion arranged on the front side of the wearer and a back body portion arranged on the back side of the wearer, having a body length direction and a width direction orthogonal to the body length direction, wherein in the front body portion, a plurality of stretchable elastic bodies extending along the width direction are arranged on the outer body along the body length direction, and shrinkage stress in the width direction is imparted to the elastic bodies, the absorbent core is arranged along the body length direction, and at a position in the body length direction where the outer body in the front body portion overlaps with the absorbent core, the outer body has a plurality of stress band regions in which the shrinkage stress in the width direction of the elastic bodies is different from each other along the body length direction, the rigidity of the absorbent core is different in each of the plurality of stress band regions, and the order of the strength of the shrinkage stress of the elastic bodies corresponds to the order of the rigidity of the absorbent core.

Description

Technical Field

[0001] The present invention relates to pants-type absorbent articles such as diapers. Background Art

[0002] Pants-type absorbent articles such as diapers have an absorbent core and an outer body for retaining body fluids, and have a waist opening at the top and leg openings on the left and right of the crotch. Elastic bodies such as thread rubber (elastic components) are arranged around the waist opening and the leg openings to form pleats, which form a structure that fits the body (for example, Patent Documents 1 to 3). In addition, regarding the absorbent core, there is a known technology for setting high-rigidity areas and low-rigidity areas in accordance with the wearer's groin area by, for example, an inclined distribution of gram weight. This can suppress a decrease in the wearing feel of the diaper, such as slow movement around the legs, caused by swelling after urination.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2012-16435

[0006] Patent Document 2: Japanese Patent Application Publication No. 2018-079058

[0007] Patent Document 3: Japanese Patent Application Publication No. 2011-206269 Summary of the invention

[0008] The present invention provides a shorts-type absorbent article, which has an absorbent body including a longitudinally long absorbent core and an outer body joined to the non-skin surface side of the absorbent body, including a waist opening for the wearer's waist to pass through and a pair of left and right leg openings for the wearer's legs to pass through, as well as a front body portion arranged on the front side of the wearer and a back body portion arranged on the back side of the wearer, and having a body length direction and a width direction orthogonal to the body length direction, in the front body portion, a plurality of stretchable elastic bodies extending along the width direction are arranged on the outer body along the body length direction, and shrinkage stress in the width direction is given to the elastic bodies, the absorbent core is arranged along the body length direction, and at a position in the body length direction where the outer body overlaps with the absorbent core in the front body portion, the outer body has a plurality of stress band areas where the shrinkage stress in the width direction of the elastic bodies is different from each other along the body length direction, the rigidity of the absorbent core is different in each of the plurality of stress band areas, and the order of the strength of the shrinkage stress of the elastic bodies corresponds to the order of the rigidity of the absorbent core.

[0009] The above and other features and advantages of the present invention will become more apparent from the following description with appropriate reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a perspective view schematically showing a pants-type diaper which is a preferred embodiment of the pants-type absorbent article of the present invention.

[0011] Figure 2 It is a schematic representation of Figure 1 The illustrated pants-type diaper is a partially sectional developed plan view showing a state in which the side seals are ruptured, developed, and stretched as viewed from the skin surface side.

[0012] Figure 3 Yes Figure 2 The front part of the pants-type diaper is shown in an enlarged plan view. DETAILED DESCRIPTION

[0013] The present invention relates to an absorbent article capable of maintaining the fit of an elastic body in a front body portion and suppressing the occurrence of local wrinkles (wrinkles) and wrinkles to achieve uniformity.

[0014] In a shorts-type absorbent article, when the absorbent core contains the aforementioned high-rigidity region and low-rigidity region, when the shrinkage stress of the elastic body configured for fit overlaps with the low-rigidity region of the absorbent core in the width direction, wrinkles and wrinkles are easily generated locally in this part. In particular, when the shorts-type absorbent article is taken out of the packaging bag before wearing and the elastic body is in a state of shrinkage, the deformation of wrinkles and wrinkles will cause local thickness and deteriorate the appearance. In addition, when the shorts-type absorbent article becomes skewed due to partial wrinkling, it may cause inconvenience when it is put into a bag for carrying. In addition, depending on the size of the deformation such as wrinkles, it may also become a cause of the decline in quality such as absorbency when worn.

[0015] On the other hand, the absorbent article of the present invention can maintain the fit of the front body portion by the elastic body, and can suppress the occurrence of local wrinkles and creases and make them uniform.

[0016] Hereinafter, a preferred embodiment of the pants-type absorbent article of the present invention will be described with reference to the drawings.

[0017] In this specification, the side in contact with the wearer's skin is referred to as the skin side or the inner side, and the opposite side is referred to as the non-skin side or the outer side. For components that do not have a surface in contact with the wearer's skin, the above terms are also used as terms to indicate the relative positional relationship in the component structure of the absorbent article. In addition, the direction located in front of the wearer when worn is referred to as the front or the front side, and the direction located in the rear side is referred to as the rear or the rear side. The normal direction of the front or back side of the worn article, that is, the direction in which the components are stacked, is referred to as the thickness direction.

[0018] like Figure 1As shown, the pants-type diaper 10 (hereinafter, also referred to as diaper 10) of the present embodiment includes a front body portion 10S arranged on the front side of the wearer and a rear body portion 10T arranged on the rear side of the wearer. In addition, the diaper 10 includes a waist opening 12 through which the waist of the wearer passes, and a pair of left and right leg openings 13, 13 through which the legs of the wearer pass. The diaper 10 has a body length direction Y and a width direction X orthogonal to the body length direction Y. The body length direction Y of the diaper 10 corresponds to the up-and-down direction of the wearer's body. As a relative positional relationship, the waist opening 12 side is also referred to as the upper side, and the leg opening 13 side is also referred to as the lower side. Figure 1 In the illustrated diaper 10 , the width direction X is also referred to as the waist direction X.

[0019] The front body 10S and the back body 10T have a ventral part 10F and a dorsal part 10R arranged on the ventral and dorsal sides of the wearer at a position close to the waist opening 12. The ventral part 10F and the dorsal part 10R are regions having a length in the body length direction Y of the side seals 11 described later and a width in the width direction X connecting the side seals 11, 11. The portion of the front body 10S excluding the ventral part 10F and the portion of the back body 10T excluding the dorsal part 10R are connected in the body length direction Y to form a crotch part 10C arranged on the crotch side of the wearer.

[0020] The diaper 10 has an absorbent body 1 including a longitudinally long absorbent core 5 and an outer body 2 joined to the non-skin surface side of the absorbent body 1 as components. The outer body 2 forms an outer body that covers the entire ventral portion 10F, the crotch portion 10C, and the dorsal portion 10R. The portion disposed on the front body portion 10S of the outer body 2 is also referred to as the front outer body 21, and the portion disposed on the back body 10T is referred to as the back outer body 22. The ventral portion 10F of the front outer body 21 and the dorsal portion 10R of the back outer body 22 have their respective side edges overlapped and joined at the side seal portion 11. As a result, the ventral portion 10F and the dorsal portion 10R of the diaper 10 are connected to form the annular portion 10D of the diaper 10. The joining of the side seal portion 11 can be performed by various methods used in such articles. For example, there can be mentioned welding (e.g., heat sealing, ultrasonic sealing, laser melting), pressure welding (e.g., embossing) and other pressure-tight integration bonding. In addition, the above-mentioned absorbent body 1 and outer body 2 can be bonded using a bonding method used in such articles, such as hot melt adhesives. The coating method can also use a method such as spiral coating that does not increase the rigidity of the components and does not hinder the liquid permeability and air permeability (the same applies to the following bonding).

[0021] Figure 2The diaper 10 is shown in a state viewed from the skin side after the side seals 11, 11 are broken, unfolded, and stretched. The unfolded and stretched state (unfolded state) means that each part is stretched to expand the pants-type absorbent article into a flat shape. In the unfolded state, the length direction Y and the width direction X correspond to the length direction Y and the width direction X in the unfolded state.

[0022] In the unfolded state of the diaper 10 , the center line CL in the longitudinal direction Y divides the front body portion 10S and the back body portion 10T.

[0023] In the unfolded state of the diaper 10, the outer body 2 has a curved shape in which both side edges of the crotch portion 10C are gently narrowed from the lower end edges of the side seal portions 11 toward the inner side in the width direction X. On the other hand, the outer body 2 has a laterally long shape extending in the width direction X at the ventral portion 10F and the dorsal portion 10R.

[0024] In a region on the skin surface side of the outer body 2 and in the center in the width direction X, the vertically long absorbent body 1 is arranged along the body length direction Y of the diaper 10 so that its longitudinal direction faces the body length direction Y.

[0025] like Figure 2 As shown, the absorbent body 1 has a liquid-permeable front sheet 3 on the skin side, a leakproof back sheet 4 on the non-skin side, and a liquid-retaining absorbent core 5 disposed between the front sheet 3 and the back sheet 4. The absorbent core 5 is a collection of absorbent materials that absorb and retain body fluids, and can also be wrapped with a hydrophilic core such as crepe paper. The absorbent core 5 has the same width (length in the width direction X) as the absorbent body 1, and is slightly shorter in length in the body length direction Y than the absorbent body 1. In addition, the preferred embodiment of the structure of the absorbent core 5 will be described later.

[0026] The absorbent body 1 also includes a pair of side panels 6 on both sides in the longitudinal direction Y. At the inner ends of the side panels 6 in the width direction X, three-dimensional pleat elastic bodies 79 are connected in a stretched state along the longitudinal direction Y to form three-dimensional pleats that can stand up toward the skin surface of the wearer when worn.

[0027] Next, the front body portion 10S will be described.

[0028] A plurality of stretchable elastic bodies extending in the width direction X are arranged along the body length direction Y in the outer body 2 (front outer body 21 ) of the front body portion 10S.

[0029] More specifically, in the outer body 2 of the ventral part 10F (the area in the width direction X corresponding to the length of the side seal part 11 in the body length direction Y) of the front body part 10S, a plurality of elastic bodies 71 around the waist opening are arranged in the area 21A around the waist opening, a plurality of elastic bodies 72 around the ilium are arranged in the area 21B around the ilium adjacent to the lower side, and a plurality of elastic bodies 73 around the waist are arranged in the area 21C around the waist adjacent to the lower side. Each elastic body extends in the width direction in an elongated state, and the side seal parts 11, 11 at the left and right ends of the ventral part 10F are joined and set to be stretchable. In addition, the area 21B around the ilium is an area that is assumed to abut the part from the iliac crest to the anterior superior iliac spine of the wearer.

[0030] From the lower part of the peri-ilium area 21B to the peri-waist area 21C, and further to the crotch 10C, the absorbent core 5 and the outer body 2 arranged in the length direction Y are stacked. In the stacked portion of the outer body 2 and the absorbent core 5, the peri-ilium elastic body 72 and the waist elastic body 73 are partially cut off. The ends of each cut elastic body 72 and 73 are joined to the outer body 2 at a position overlapping with the left and right sides of the absorbent core 5, and are stretchable between the other ends joined to the side seal 11. In this way, the peri-ilium elastic body 72 and the waist elastic body 73 overlap with the absorbent core 5 at a height position in the body length direction Y, and extend in the width direction X on the left and right sides of the absorbent core 5. The elastic bodies 72 and 73 separated left and right by partial cutting are respectively on the same line along the width direction X. The elastic bodies 72 and 73 separated left and right and on the same line respectively apply the contraction stress of the elastic body to the outer body 2 and the absorbent core 5 on the same line. Therefore, from the functional point of view, the elastic body that is divided into the left and right but on the same line can be regarded as one elastic body. When counting the number of elastic bodies, the elastic body that is divided into the left and right and on the same line is regarded as one.

[0031] Furthermore, the outer body 2 is provided with a groin surrounding elastic body 74 in a groin surrounding area 21D at the part where the both side edges of the crotch portion 10C of the front body portion 10S are narrowed from the lower end edge of the side seal portion 11 toward the inner side in the width direction X. The groin surrounding area 21D is a region that is assumed to abut against a portion connecting the upper end of the wearer's groin.

[0032] The groin elastic body 74 extends in the width direction X in a stretched state and is joined at both ends of the groin region 21D in the width direction X. In addition, the groin elastic body 74 is partially cut at the overlapping portion with the absorbent core 5 and is joined to the outer body 2 at the position overlapping with the left and right sides of the absorbent core 5. Figure 2In the embodiment, one groin-surrounding elastic body 74 is arranged which is divided into left and right sides by partial cutting and is located on the same line along the width direction X. The number of the groin-surrounding elastic bodies 74 is not limited to Figure 2 In the embodiment shown, two or more elastic bodies 74 may be provided. However, from the viewpoint of suppressing the occurrence of product wrinkles due to contraction stress, it is preferable to arrange one groin peri-groin elastic body 74 in the groin peri-groin region 21D.

[0033] As described above, in the front body portion 10S, a plurality of various elastic bodies extending in the width direction X and capable of stretching are arranged along the body length direction Y, and contraction stress in the width direction X is applied to the outer body 2 by the elastic bodies.

[0034] The waist opening surrounding elastic body 71 of the waist opening surrounding area 21A, the iliac surrounding elastic body 72 of the iliac surrounding area 21B, the waist surrounding elastic body 73 of the waist surrounding area 21C, and the groin surrounding elastic body 74 of the groin surrounding area 21D are made different in number, pitch, and type (diameter, material) from each other in such a manner as to impart corresponding contraction stress to each area. In addition, the number and pitch of each elastic body are not limited to Figure 2 The various elastic bodies are preferably sandwiched by two layers of nonwoven fabric sheets or the like constituting the outer body 2 and fixed in a stretchable manner.

[0035] In the outer body 2 of the front body 10S, in addition to the elastic body extending in the width direction X, the elastic body 78 around the legs extends in a direction intersecting with the width direction X. More specifically, the elastic body 78 around the legs extends from the lower end regions of the left and right side seals 11 of the abdominal part 10F in the width direction X, and then extends downwardly intersecting with the width direction X, and is arranged on the outer body 2 along the curved portions of the side edges of the crotch part 10C narrowing inwardly in the width direction X. The elastic body 78 around the legs is arranged along the leg opening 13 in this way. The elastic body 78 around the legs also changes direction and extends inwardly in the width direction X near the center line CL in the longitudinal direction Y.

[0036] In addition, similarly to the ventral part 10F of the front body part 10S, various elastic bodies 71, 72, and 73 are also arranged in the dorsal part 10R of the back body part 10T. In addition, the absorbent core 5 along the length direction is stacked with respect to the dorsal part 10R and the crotch part 10C of the back body part 10T in the same manner as in the case of the front body part 10S. Similar to the front body part 10S, in the back body part 10T, the leg-surrounding elastic bodies 78 are also arranged along the leg openings 13. However, the leg-surrounding elastic bodies 78 in the back body part 10T extend slightly to the front body part 10S side across the center line CL in the length direction Y, and at this position change direction to the inside in the width direction X and overlap with the leg-surrounding elastic bodies 78 in the front body part 10S.

[0037] At the position in the front body 10S where the outer body 2 overlaps with the absorbent core 5 in the length direction Y, the outer body 2 has a plurality of stress band regions where the shrinkage stresses of the various elastic bodies in the width direction X mentioned above are different from each other along the length direction Y. The stress band region refers to the region range of the entire region in the width direction X of the outer body 2 at the position in the length direction Y where the outer body 2 overlaps with the absorbent core 5. The shrinkage stress in the width direction X of each stress band region is appropriately set based on the number of roots, pitch, and type (diameter, material) of the elastic body. When the absorbent core 5 is multi-layered, the end portion on the waist opening 12 side of the "position in the length direction Y where the outer body 2 overlaps with the absorbent core 5" is determined as the portion where all layers are stacked, and does not include the portion on the waist opening 12 side where the number of stacked layers of the absorbent core 5 is inconsistent.

[0038] Each stress band area is divided at a position where at least one of the pitches or types (diameter, material) of various elastomers extending along the width direction X is switched. The stress band area is switched by a change in pitch at an interval exceeding ±10% from a specified interval. The boundary of each area is the edge of the area directly above or the edge of the lower side of the elastomer at the lower end. It is preferred to set the length (width) of each stress band area in the body length direction Y to within 30 mm. By setting the length (width) of each stress band area in the body length direction Y to within 30 mm, the outer body 2 can adapt to follow the wearer's body shape with more detailed contour changes. For example, the outer body 2 can follow the subtle ups and downs of the body shape from the lower abdomen to the crotch according to the curvature of the wearer's abdomen, the depression of the boundary between the groin and the abdomen, etc.

[0039] exist Figure 3 In the embodiment shown, the plurality of stress band regions include a first stress band region 21L, a second stress band region 21M, and a third stress band region 21N from the end side of the waist opening 12 side of the absorbent core 5. At this time, when the absorbent core 5 is multi-layered as described above, the first stress band region 21L is determined on the waist opening 12 side according to the position where all the layers are stacked. Figure 3 In order to understand the arrangement relationship between the stress zone region and the absorbent core 5, the absorbent core 5 is indicated by a solid line, and components of the absorbent body 1 other than the absorbent core 5 are omitted.

[0040] The positions of the stress band regions in the body length direction Y where the outer cover 2 and the absorbent core 5 overlap are divided as follows based on the above-mentioned division criteria.

[0041] That is, the first stress zone region 21L is a region extending from the lower edge of the iliac peri-iliac elastic body 72 at the lower end of the iliac peri-iliac region 21B directly above to the lower edge of the waist peri-iliac elastic body 73 at the lower end of the waist peri-iliac region 21C. The first stress zone region 21L includes the entire region in the width direction X between the side seal portions 11, 11 of the outer body 2 in the range divided along the above-mentioned body length direction Y.

[0042] The second stress zone region 21M is a region extending from the lower edge of the waist elastic body 73 at the lower end of the waist region 21C to the lower edge of the groin elastic body 74 in the groin region 21D. The second stress zone region 21M includes the entire region in the width direction X of the outer body 2 in the range divided along the body length direction Y.

[0043] The third stress zone area 21N is an area from the lower edge of the groin elastic body 74 of the groin area 21D to the remaining portion of the front side 5A obtained by dividing the absorbent core 5 into three equal parts (front side 5A, middle side 5B, and rear side 5C). The third stress zone area 21N includes the entire area of ​​the outer body 2 in the width direction X in the range divided along the above-mentioned body length direction Y.

[0044] exist Figure 3 In the embodiment shown, the first stress zone region 21L, the second stress zone region 21M, and the third stress zone region 21N have different shrinkage stresses in the width direction X. The difference in shrinkage stress in the width direction X is appropriately set according to the corresponding relationship between the fit of the diaper 10 and the rigidity of the absorbent core 5. The preferred embodiment of the shrinkage stress and rigidity will be described later.

[0045] In addition, the plurality of stress zone regions of the exterior body 2 in the front body portion 10S are not limited to the three regions described above, and may be two regions or four or more regions.

[0046] The absorbent core 5 stacked for each stress zone region has a different rigidity for each of the plurality of stress zone regions. The rigidity of the absorbent core 5 can be appropriately set by weight, thickness, and the like.

[0047] The order of the strength of the shrinkage stress of the elastic body in the outer body 2 corresponds to the order of the rigidity of the absorbent core 5. That is, in the order, the portion where the shrinkage stress of the elastic body in the outer body 2 is relatively strong corresponds to the portion where the rigidity of the absorbent core 5 is relatively high, and the portion where the shrinkage stress of the elastic body in the outer body 2 is relatively weak corresponds to the portion where the rigidity of the absorbent core 5 is relatively low. In the place where the rigidity of the absorbent core 5 is relatively high, the shrinkage stress in the width direction X of the stress band area of ​​the outer body 2 is relatively strong, and the outer body 2 or the absorbent core 5 in this part has a higher fit to the skin of the wearer. At the same time, in the place where the rigidity of the absorbent core 5 is relatively low, the shrinkage stress in the width direction X of the stress band area of ​​the outer body 2 is relatively weak, which can suppress the wrinkles and wrinkles of the outer body 2 that are easy to occur in this part, and the local skew deformation caused by this.

[0048] Thus, in the front body 10S of the diaper 10, the fit brought by the elastomer can be maintained, and the local wrinkles and wrinkles can be suppressed and made uniform. For example, even if the absorbent core 5 is set to be tilted and distributed in accordance with the urination point and the groin parts on both sides thereof, and the structure having the high rigidity area in the center and the low rigidity areas on both sides thereof, the contraction stress applied to the absorbent core 5 can be made uniform. As a result, the contraction stress applied to the outer body 2 affected by the rigidity of the absorbent core 5 can be made uniform. Thus, together with the fit brought by the elastomer and the anti-liquid leakage property accompanying it, the balance and uniformity of wrinkles can be achieved. That is, the tilted configuration of the sharp wrinkles caused by the contraction of the elastomer can be prevented, the change of the presence or absence of wrinkles can be alleviated, and the overall quality of the diaper 10 can be improved. Through the balance and uniformity of wrinkles, it is not easy to partially skew and deform in the diaper 10 in which the elastomer is in a contracted state before wearing, and the portability when put into a bag for carrying is also improved. Furthermore, when the diaper 10 is worn, wrinkles are not likely to remain on the outer body 1, and deformation such as local wrinkles of the outer body 1 that is stretched due to the stretching of various elastic bodies can be suppressed, and floating between the skin surface and the like can be suppressed. Thus, when the diaper 10 is worn, the physical properties of the elastic body and the structural performance of the front body 10S cooperate to further improve the fit when worn. In addition, by suppressing the improvement of the fit caused by deformation such as local wrinkles, the transmission leakage of body fluids can be suppressed and the liquid leakage prevention can be further improved.

[0049] In addition, by making the absorbent core 5 thinner, it is also possible to suppress the distorted deformation caused by wrinkles and wrinkles of the outer body 2. Moreover, by making the diaper 10 thinner and suppressing wrinkles, the outer shape of the diaper 10 when worn can be made smoother and the diaper 10 can be worn as an item similar to underwear, creating a safe wearing feeling.

[0050] In the front body 10S of the diaper 10, the correspondence between the order of the strength of the contraction stress of the elastic body in the width direction X corresponding to the division of the plurality of stress band regions and the order of the rigidity of the absorbent core 5 can be appropriately set according to the purpose of the diaper 10. For example, Figure 3 In the embodiment shown, the shrinkage stress in the width direction X may be strong, medium, weak, or strong, weak, medium, in the order of the first stress band area 21L, the second stress band area 21M, and the third stress band area 21N. In addition, the rigidity may be high, medium, low, or high, low, medium, in the order of the first absorption part 5L, the second absorption part 5M, and the third absorption part 5N of the absorbent core 5 corresponding to the partition. From the viewpoint of improving the anti-slip property and fit of the diaper 10 when worn, and reliably absorbing and transmitting the flowing excreted urine to improve the anti-liquid leakage property, it is preferred that in the above-mentioned three partitions, the shrinkage stress in the width direction X of the first stress band area 21L of the waist surrounding area 21C on the side of the waist opening 12 is the strongest, and the rigidity of the first absorption part 5L of the absorbent core 5 corresponding thereto is the highest.

[0051] In particular, regarding the above order, it is preferred that the shrinkage stress of the elastic body in the width direction X and the rigidity of the absorbent core 5 decrease in stages (e.g., stepwise) from the end side of the waist opening 12 side of the absorbent core 5 toward the lower side in the body length direction Y. Figure 3 In the embodiment shown, it is preferred that the shrinkage stress in the width direction X is strong, medium, and weak in the order of the first stress band area 21L, the second stress band area 21M, and the third stress band area 21N, and the rigidity is high, medium, and low in the order of the first absorption part 5L, the second absorption part 5M, and the third absorption part 5N of the absorbent core 5 corresponding to the partition.

[0052] Thus, in the front body 10S of the diaper 10, the fit and liquid leakage resistance of the diaper 10 when worn and the uniformity of wrinkles before wearing can be achieved more reliably. In addition, when the diaper 10 is worn, local deformation caused by wrinkles and wrinkles can also be suppressed. In addition, the slow movement caused by partial deformation on the crotch 10C side when worn can be alleviated. More specifically, the first stress band area 21L of the outer body 2 and the first absorption part 5L of the absorbent core 5 correspond to the waist surrounding area 21C of the front body 10S of the diaper 10. As mentioned above, the anti-slip property and fit of the diaper 10 can be improved, and the liquid leakage resistance for the transmission leakage of excreted urine can be improved. The second stress zone area 21M of the outer body 2 and the second absorbent part 5M of the absorbent core 5 adjacent to the lower side correspond to the groin area 21D of the front body 10S of the diaper 10, ensuring the mobility of the wearer's thigh root and having the ability to follow the skin surface corresponding to the bending of the thigh root, suppressing the floating caused by wrinkles in this part, and having soft fit to the skin. Furthermore, the third stress zone area 21N of the outer body 2 and the third absorbent part 5N of the absorbent core 5 adjacent to the lower side correspond to the lower abdomen area of ​​the front body 10S of the diaper 10, and cooperate with the mobility of the above-mentioned groin area 21D to ensure the wearer's movement, and suppress the floating caused by wrinkles, etc., gently wrap the bulge of the wearer's lower abdomen to improve the fit.

[0053] From these viewpoints, it is preferred that the second stress zone region 21M of the outer body 2 contains one elastic body 74 around the groin portion, and the third stress zone region 21N of the outer body 2 does not contain an elastic body extending in the width direction X. In addition, with respect to the structure of the outer body 2, it is preferred that the absorbent core 5 has a structure of a skin-side absorption portion 51 and a skin-side absorption portion 52 described below.

[0054] <Method for measuring shrinkage stress and rigidity in the width direction X>

[0055] The shrinkage stress and rigidity in the width direction X are measured by the following method.

[0056] (1) First, the shorts-type absorbent article to be measured is disconnected at the side seal portion 11, and the position in the longitudinal direction Y where the absorbent core 5 and the outer body 2 overlap is determined at the front body portion 10S. At this position, each stress band area and each corresponding absorption portion divided in the longitudinal direction Y of the absorbent core 5 are determined, and each stress band area is a region covering the entire area in the width direction of the outer body 2 divided at the position where at least one of the pitch or type (diameter, material) of the various elastic bodies contained in the outer body 2 is switched. The boundary of each area is the edge of the area directly above or the edge of the lower side of the elastic body at the lower end. When the switching position cannot be determined, for the area corresponding to the front side 5A obtained by dividing the absorbent core 5 into three equal parts, the length (width) in the longitudinal direction Y is determined and the area is evenly divided to determine each stress band area and each absorption portion. For example, the length (width) in the longitudinal direction Y is within 30 mm.

[0057] (2) Next, a cooling method such as cold spray is used to weaken the adhesive force of the adhesive or the like that joins the outer body 2 and the absorbent body 1 including the absorbent core 5, and the outer body 2 and the absorbent core 5 are separated. The stress band regions are cut out from the separated outer body 2. Furthermore, the absorbent portions are cut out from the separated absorbent core 5.

[0058] (3) Contraction stress in the width direction X of the stress band area:

[0059] Fix the two ends of each stress band area of ​​the outer body 2 in the width direction X with a clamp, and use a self-drawing (オートグラム) tester to measure the maximum stress when stretched 60mm in the width direction X under the measurement condition of a speed of 300mm / minute. For example, when the length of the stress band area in the width direction X of the measured object is 165mm, the width of the clamps at both ends is 15mm respectively, and the width between the clamps is 135mm. It is stretched to 195mm and then restored to 135mm, and the maximum stress at the time of 60mm stretching is measured. The measured value is converted into a value of 30mm length unit in the body length direction Y, and the converted value is used as the shrinkage stress in the width direction X of each stress band area. In addition, the above self-drawing test can use the "RTA-100" manufactured by Orientec, for example.

[0060] (4) Rigidity of the absorbent core 5:

[0061] Fix the two ends of each absorbent part in the width direction X of the absorbent core 5 with a clamp, and use a large bending tester to bend the center of the width direction X and the part 40 mm from the side end, and measure the bending moment at this time. The average value is used as the rigidity of each absorbent part. In addition, for the large bending tester, for example, KES FB2-L (manufactured by KatoTech Co., Ltd.) can be used.

[0062] In the structure of the front body 10S corresponding to the order of the strength of the shrinkage stress of the elastic body of the outer body 2 and the order of the rigidity of the absorbent core 5, it is preferred that the stress band area and the absorbent part corresponding in order have the following relationship. That is, from the viewpoint of more effectively suppressing the formation of wrinkles in the stress band area, the ratio (P / Q) of the shrinkage stress (P) of the stress band area to the rigidity (Q) of the absorbent part is preferably as small as possible, specifically, 0 or more, preferably 0.19 or less, more preferably 0.10 or less, and further preferably 0.05 or less.

[0063] In the above ratio (P / Q) range, from the viewpoint of making the diaper less likely to slip, the contraction stress (P) of each stress band region is preferably 0.05 N / 30 mm or more, more preferably 0.3 N / 30 mm or more, and further preferably 0.5 N / 30 mm or more. In addition, from the viewpoint of reducing the restraint of the diaper, the contraction stress (P) of each stress band region is preferably 2.5 N / 30 mm or less, more preferably 2.0 N / 30 mm or less, and further preferably 1.5 N / 30 mm or less.

[0064] exist Figure 3 In the embodiment shown, when the shrinkage stress gradually decreases toward the lower side in the body length direction Y, the difference (P1-P2) between the shrinkage stress (P1) of the first stress band area 21L and the shrinkage stress (P2) of the second stress band area 21M is preferably 0.1N / 30mm or more, more preferably 0.3N / 30mm or more, and further preferably 0.5N / 30mm or more, from the viewpoint of achieving a balance between suppressing the slipping of the waist when the diaper is worn and suppressing the formation of large horizontal wrinkles in the diaper when not worn, which leads to poor appearance. From the viewpoint of suppressing the uneven formation of wrinkles in the diaper when not worn, which leads to poor appearance, the difference (P1-P2) is preferably 1.2N / 30mm or less, more preferably 1.0N / 30mm or less, and further preferably 0.8N / 30mm or less.

[0065] In addition, from the viewpoint of suppressing the drooping of the absorbent core when worn, the difference (P2-P3) between the contraction stress (P2) of the second stress band region 21M and the contraction stress (P3) of the third stress band region 21N is preferably 0.1N / 30mm or more, more preferably 0.3N / 30mm or more, and further preferably 0.5N / 30mm or more. From the viewpoint of suppressing the poor appearance caused by the uneven formation of wrinkles of the diaper when not worn, the difference (P2-P3) is preferably 1.2N / 30mm or less, more preferably 1.0N / 30mm or less, and further preferably 0.8N / 30mm or less.

[0066] Furthermore, within the range of the above ratio (P / Q), from the viewpoint of suppressing the collapse of each absorbent part due to shrinkage stress (maintaining the product shape), the rigidity (Q) of each absorbent part in the above-mentioned zone in the body length direction Y is preferably 1.0 gf·cm / cm or more, more preferably 1.5 gf·cm / cm or more, and further preferably 2.0 gf·cm / cm or more. Furthermore, from the viewpoint of preventing the hardening of each absorbent part from causing a decrease in the softness of the product, the rigidity (Q) of each absorbent part is preferably 10.0 gf·cm / cm or less, more preferably 8.5 gf·cm / cm or less, and further preferably 7.0 gf·cm / cm or less.

[0067] exist Figure 3 In the embodiment shown, when the rigidity decreases stepwise toward the lower side in the body length direction Y, the difference (Q1-Q2) between the rigidity (Q1) of the first absorbent part 5L and the rigidity (Q2) of the second absorbent part 5M is preferably 0.3 gf·cm / cm or more, more preferably 0.4 gf·cm / cm or more, and further preferably 0.5 gf·cm / cm or more from the viewpoint of the change in the perceived hardness given to the material. From the viewpoint of suppressing the formation of the bending point of the absorbent core 5 which is the starting point of wrinkles of the product, the difference (Q1-Q2) is preferably 8.0 gf·cm / cm or less, more preferably 6.0 gf·cm / cm or less, and further preferably 4.0 gf·cm / cm or less. In addition, from the viewpoint of suppressing the drooping of the absorbent core 5 when worn, the difference (Q2-Q3) between the rigidity (Q2) of the second absorbent part 5M and the rigidity (Q3) of the third absorbent part 5N is preferably 0.3 gf·cm / cm or more, more preferably 0.5 gf·cm / cm or more, and further preferably 0.7 gf·cm / cm or more. From the viewpoint of suppressing the lateral wrinkles of the product when not worn, the difference (Q2-Q3) is preferably 8.0 gf·cm / cm or less, more preferably 6.0 gf·cm / cm or less, and further preferably 4.0 gf·cm / cm or less.

[0068] In the plurality of stress band regions of the front body portion 10S, it is preferred that the elastic bodies be arranged at a pitch with wider intervals as the rigidity of the absorbent core 5 is lower. Figure 3 In the embodiment shown, when the order of the strength of the contraction stress and the order of the rigidity gradually decrease toward the lower side in the body length direction Y as described above, it is preferable to adopt the following method. That is, the pitch of the elastic body 74 around the groin part in the second stress zone area 21M and the pitch between the elastic body 74 around the groin part and the elastic body 73 around the waist just above are preferably larger than the pitch of the elastic body 73 around the waist in the first stress zone area 21L.

[0069] This can suppress excessive concentration of stress on the outer body 2 and the absorbent core 5 due to the arrangement of the elastic bodies at a narrow pitch, and the effect of making the wrinkles and creases uniform can be further improved.

[0070] Moreover, it is preferable to set the order of rigidity of the absorbent core 5 of the front body part 10S by the difference of the basis weight of the absorbent core 5.

[0071] Next, a preferred embodiment of the structure of the absorbent core 5 will be described below.

[0072] Figure 2 and 3 A preferred embodiment of the structure of the absorbent core 5 is shown.

[0073] The absorbent core 5 extends along the body length direction Y from the lower end of the ilium periphery region 21B of the ventral part 10F of the front body part 10S to the ilium periphery region 22B of the dorsal part 10R of the back body part 10T.

[0074] exist Figure 2 and 3 In the embodiment shown, the absorbent core 5 has a laminated structure of a skin-side absorbent layer 51 and a non-skin-side absorbent layer 52. The skin-side absorbent layer 51 and the non-skin-side absorbent layer 52 are respectively a collection of absorbent materials for absorbing and retaining body fluids. They can also be wrapped with a hydrophilic core such as crepe paper.

[0075] The non-skin side absorbent layer 52 is rectangular, but the length of the skin side absorbent layer 51 in the longitudinal direction Y is shorter than that of the non-skin side absorbent layer 52, and the length in the width direction X is uneven, and has a T-shaped shape. Specifically, when the absorbent core 5 is divided into three equal parts along the longitudinal direction Y into the front side 5A, the middle 5B, and the rear side 5C, the non-skin side absorbent layer 52 has a rectangular shape with a uniform width in the width direction X, occupying the entire front side 5A, the middle 5B, and the rear side 5C. The skin side absorbent layer 51 maintains a shape in which the width in the width direction X is the widest in a predetermined range in the longitudinal direction Y at the front side 5A, and the width gradually narrows as it goes toward the middle 5B and the rear side 5C. The skin side absorbent layer 51 has a length in the longitudinal direction Y from the front side 5A to the middle 5B and ends at a portion of the rear side 5C.

[0076] The laminated structure of the absorbent core 5 is not limited to the above-mentioned two layers, and may be three or more layers.

[0077] Moreover, the absorbent core 5 has a central slit portion 511 extending along the body length direction Y at the center of the width direction X and a pair of side slit portions 521, 521 extending along the body length direction Y on the left and right sides of the central slit portion 511. The central slit portion 511 is arranged in the multi-layer stacked structure of the absorbent core 5. The central slit portion 511 and the side slit portions 521 are portions where the absorbent material constituting the absorbent core 5 at this position is missing, and the gram weight of the absorbent core 5 is reduced in this portion. The central slit portion 511 and the side slit portions 521 can be slits formed to a predetermined depth from the skin surface side, or can be through holes that penetrate the entire thickness of the absorbent core 5.

[0078] The central slit 511 is arranged in the multi-layered structure of the skin-side absorbent layer 51 and the non-skin-side absorbent layer 52, and is formed as a through hole spanning the two layers. The central slit 511 extends in a straight line from the position where the width of the skin-side absorbent layer 51 on the front side 5A begins to narrow to the middle 5B along the longitudinal direction Y. The central slit 511 corresponds to the position from the lower end of the second stress zone area 21M of the outer body 2 slightly beyond the central line CL in the longitudinal direction Y to the position entering the back body 10T.

[0079] The side slits 521 extend in the longitudinal direction Y along the side edges of the narrowed width portion of the skin-side absorbent layer 51. That is, the side slits 521 are through holes that are only a portion of the non-skin-side absorbent layer 52. The side slits 511 extend from a position on the crotch 10C side of the front side 5A relative to the central through hole 511 to a portion of the rear side 5C along the longitudinal direction. The side slits 521 correspond to a position from the third stress zone region 21N of the outer body 2 beyond the central line CL in the longitudinal direction Y to the center of the rear body 10T.

[0080] The absorbent core 5 can be provided with a reduced weight portion by the slits described above, so as to control the difference in rigidity of the entire absorbent core 5 not to become excessively large. This can further improve the accuracy of making wrinkles and folds of the diaper 10 uniform.

[0081] By adopting the above structure, the gram weight of the absorbent core 5 is reduced and the rigidity is reduced in the order from the waist opening 12 side along the body length direction Y in the front body part 10S. More specifically, along the body length direction Y, the gram weight of the absorbent core 5 is reduced and the rigidity is reduced in the following order: (i) a portion having a plurality of laminated structures of a skin-side absorbent layer 51 and a non-skin-side absorbent layer 52 and not containing a central slit portion 511, (ii) a portion having the laminated structure and containing a central slit portion 511, (iii) a portion having the laminated structure and a single-layer structure of only the side absorbent portions 52 on both sides thereof, and also containing a central slit portion 511 and a pair of side slit portions 521, 521.

[0082] Regarding the absorbent core 5 of the above-mentioned structure, the first absorbent portion 5L of the absorbent core 5 overlapping with the first stress band region 21L of the outer body 2 is in the portion (i). The second absorbent portion 5M of the absorbent core 5 overlapping with the second stress band region 21M of the outer body 2 is the portion (ii), and includes a central slit portion 511. The third absorbent portion 5N of the absorbent core 5 overlapping with the third stress band region 21N of the outer body 2 is the portion (iii), and includes a central slit portion 511 and a pair of side slit portions 521, 521.

[0083] By having the above correspondence, wrinkles caused by the contraction stress in the width direction of each stress band region are less likely to be formed, and the amplitude and number of wrinkles formed in each region can be made uniform.

[0084] Furthermore, by overlapping the first absorbent section 5L of the absorbent core 5 and the first stress zone region 21L of the outer body 2, it is possible to minimize wrinkles in the product while maintaining the contraction stress necessary for a good fit at the waist.

[0085] Among the three areas, the area (i) mentioned above is most likely to form wrinkles, and the area (iii) mentioned above is the most difficult to form wrinkles. However, by overlapping the second absorption part 5M of the absorbent core 5 with the second stress band area 21M of the outer body 2, the area (ii) becomes a wrinkled state in the middle, and the wrinkles become less noticeable when observing the product as a whole.

[0086] The third absorption part 5N of the absorbent core 5 overlaps with the third stress zone area 21N of the outer body 2, so that no load is applied to the leg circumference in the crotch. On the other hand, since the third absorption part 5N of the absorbent core 5 has the lowest rigidity, wrinkles are easily formed even with a slight stress load, but the corresponding third stress zone area 21N of the outer body 2 is an area where almost no contraction stress is applied, so few wrinkles are formed on the product.

[0087] The diaper 10 includes the absorbent core 5 of the above structure, and in the front body portion 10S, the order of the strength of the shrinkage stress of the elastic body in the outer body 2 corresponds to the order of the height of the rigidity of the absorbent core 5. To further explain, the shrinkage stress of the elastic body in the outer body 2 in the width direction X and the rigidity of the absorbent core 5 gradually decrease from the end side of the waist opening 12 side of the absorbent core 5 to the lower side in the body length direction Y.

[0088] When the front body 10S of the diaper 10 is viewed from above, the central slit 511 preferably does not overlap with the arrangement positions of two or more elastic bodies extending along the width direction X in the body length direction Y. Thus, wrinkles and wrinkles in the laminated structure of the absorbent core 5 starting from the central slit 511 can be more effectively suppressed.

[0089] Furthermore, in the plurality of stress band regions of each front body portion 10S, it is preferred that the portion of the elastic body 78 around the legs extending in a direction intersecting the width direction X does not intersect with two or more elastic bodies extending in the width direction X. Thus, the elastic body 78 around the legs is prevented from being clamped by two or more elastic bodies extending in the width direction X and being affected by stress, etc., and becoming a starting point for wrinkles and creases.

[0090] The constituent materials of the members constituting the diaper 10 can be any materials used in such articles without particular limitation.

[0091] For example, various elastomers can use common parts used for such articles, for example, as materials, synthetic rubbers such as styrene-butadiene, butadiene, isoprene, chloroprene rubber, natural rubber, EVA, stretchable polyolefin, polyurethane, etc. can be listed, and as forms, lines or ropes (rubber belts, etc.) with rectangular, square, circular, polygonal cross-sections, or multifilament lines can be used. Specifically, for the rubber line, rubber with the fineness as described above can be used.

[0092] The outer body 2 may be a structure consisting of one layer or a structure consisting of two or more layers. In either case, its constituent parts may include nonwoven fabrics, laminated materials of nonwoven fabrics and resin films, porous films, etc. In addition, from the viewpoint of leakage prevention, the outer body 2 is preferably liquid-impermeable, and in order to prevent excessive increase in humidity in the diaper, it is preferably breathable and water vapor permeable.

[0093] From the viewpoint of rapid absorption of excreted body fluids, transmission to the absorbent, and good skin touch, the front sheet 3 constituting the absorbent body 1 is preferably a hydrophilic thermal bonding nonwoven fabric, and is particularly preferably a hot air nonwoven fabric. The front sheet 3 is a thermoplastic resin fiber treated with hydrophilization, and the fiber is preferably a three-dimensional curled fiber such as a second curl or a third curl. Specifically, polyethylene, polypropylene, polyester, nylon, and their composite fibers are made, and various hydrophilizing agents are applied before cutting into a prescribed length to form short fibers. As the hydrophilizing agent, various alkyl sulfonates represented by α-olefin sulfonates, acrylates, acrylate / acrylamide copolymers, esteramides, salts of esteramides, polyethylene glycols and their derivatives, water-soluble polyester resins, various polysilicone derivatives, various sugar derivatives, and mixtures thereof, which are well known to those skilled in the art, can be used for hydrophilization.

[0094] As the back sheet 4, as long as it prevents the penetration of liquid and has moisture permeability, it is not particularly limited, and for example, a hydrophobic thermoplastic resin and a tiny inorganic filler composed of calcium carbonate or an organic polymer without compatibility are melt-kneaded to form a film, and the film is stretched uniaxially or biaxially to obtain a porous film. As the thermoplastic resin, polyolefins can be cited. As the polyolefin, high-low density polyethylene, linear low-density polyethylene, polypropylene, polybutene, etc. can be cited, and they can be used alone or in combination.

[0095] Examples of the absorbent core 5 include a mixture of hydrophilic fibers and super absorbent polymer particles, a mixture of hydrophilic fibers, super absorbent polymer particles and thermoplastic synthetic resin fibers, or a water-absorbent sheet in which super absorbent polymer particles are sandwiched between a plurality of fiber sheets. As the hydrophilic fibers, fibers having a hydrophilic surface can be used, and examples thereof include fibers obtained by hydrophilizing cellulose fibers or synthetic fibers using a surfactant or the like as required. In the case of the mixture, in order to prevent the morphology from being destroyed and the polymer particles from falling off, the entire mixture is wrapped with a liquid-permeable sheet such as tissue paper or a hydrophilic fiber nonwoven fabric. As the polymer particles, starch, cellulose, and synthetic polymer particles can be used.

[0096] As the side sheet 6, a water-repellent nonwoven fabric is preferred, and a water-repellent nonwoven fabric such as a spunbond nonwoven fabric, a meltblown nonwoven fabric, a spunlace nonwoven fabric, a hot roll nonwoven fabric, a needle-punched nonwoven fabric, or various nonwoven fabrics treated with water repellency can be used. For example, a spunbond nonwoven fabric, a spunbond-meltblown (SM) nonwoven fabric, a spunbond-meltblown-spunbond (SMS), a spunbond-meltblown-meltblown-spunbond (SMMS), a spunbond-spunbond-meltblown-spunbond (SSMS) nonwoven fabric, etc. are particularly preferably used.

[0097] The shorts absorbent article of the present invention may be an article for infants or adults, or an article in a form other than a diaper, for example, a menstrual shorts, a shorts-type sanitary napkin, a disposable shorts, etc.

[0098] Regarding the above-mentioned embodiment, the present invention further discloses the following pants-type absorbent article.

[0099] <1>

[0100] A pants-type absorbent article, comprising an absorbent body including a longitudinally long absorbent core and an outer body joined to the non-skin surface side of the absorbent body, including a waist opening for a wearer's waist to pass through and a pair of left and right leg openings for the wearer's legs to pass through, and a front body portion arranged on the front side of the wearer and a back body portion arranged on the back side of the wearer, and having a body length direction and a width direction orthogonal to the body length direction,

[0101] In the shorts-type absorbent article,

[0102] In the front body portion, a plurality of elastic bodies extending in the width direction are arranged on the outer body along the length direction of the body, and contraction stress in the width direction is applied to the elastic bodies. The absorbent core is arranged along the length direction of the body.

[0103] At the position in the front body portion in the body length direction where the outer body overlaps with the absorbent core, the outer body has a plurality of stress band regions in which the shrinkage stress of the elastic body in the width direction is different from one another along the body length direction, the rigidity of the absorbent core is different in each partition of the plurality of stress band regions, and the order of the shrinkage stress of the elastic body corresponds to the order of the rigidity of the absorbent core.

[0104] <2>

[0105] As mentioned above <1> The pants-type absorbent article, wherein the width of each of the plurality of stress band regions in the body length direction is within 30 mm.

[0106] <3>

[0107] As mentioned above <1> or <2> The pants-type absorbent article is characterized in that, in the sequence, the contraction stress and the rigidity gradually decrease from the end side of the absorbent core on the waist opening side toward the lower side in the body length direction.

[0108] <4>

[0109] As mentioned above <1> ~ <3> The pants-type absorbent article described in any one of the above, wherein, between the plurality of stress band regions, the elastic bodies are arranged at a pitch with a wider interval as the rigidity of the absorbent core is lower.

[0110] <5>

[0111] As mentioned above <1> ~ <4> The pants-type absorbent article according to any one of the preceding claims, wherein the order of the rigidity of the absorbent core is set by the difference in basis weight of the absorbent core.

[0112] <6>

[0113] As mentioned above <1> ~ <5> The shorts-type absorbent article described in any one of the preceding claims, wherein the absorbent core has a central slit portion extending along the body length direction at the center of the width direction, and a pair of side slit portions extending along the body length direction on the left and right sides of the central slit portion, and the central slit portion is configured as a multi-layer stacked structure of the absorbent core.

[0114] <7>

[0115] As mentioned above <6> In the pants-type absorbent article, when the front body portion is viewed from above, the central slit portion does not overlap with the arrangement positions in the body length direction of two or more of the elastic bodies extending in the width direction.

[0116] <8>

[0117] As mentioned above <6> or <7> The shorts-type absorbent article, wherein the multiple stress band areas include the first stress band area, the second stress band area and the third stress band area starting from the end side of the waist opening side of the absorbent core, the absorbent core overlapping with the first stress band area is located in the part that does not contain the central gap portion of the multi-layer stacking structure, the absorbent core overlapping with the second stress band area contains the central gap portion, and the absorbent core overlapping with the third stress band area contains the central gap and a pair of side gap portions.

[0118] <9>

[0119] As mentioned above <1> ~ <8> The shorts-type absorbent article according to any one of the preceding claims, wherein the plurality of stress band regions include a first stress band region, a second stress band region, and a third stress band region from the end side of the waist opening side of the absorbent core,

[0120] The shrinkage stress weakens in the order of the first stress zone region, the second stress zone region, and the third stress zone region.

[0121] The rigidity of the absorbent core becomes weaker in the order of the first stress zone region, the second stress zone region, and the third stress zone region.

[0122] <10>

[0123] As mentioned above <1> ~ <9> The shorts-type absorbent article described in any one of the above, wherein the outer body has a leg elastic body surrounding the leg opening, and in each of the plurality of stress band areas, a portion of the leg elastic body extending in a direction intersecting the width direction does not intersect with two or more of the elastic bodies extending in the width direction.

[0124] <11>

[0125] As mentioned above <1> ~ <10> The shorts-type absorbent article according to any one of the preceding claims, wherein a ratio (P / Q) of the contraction stress (P) of the stress band region to the rigidity (Q) of the absorbent portion is 0.19 or less, preferably 0.10 or less, and more preferably 0.05 or less.

[0126] Example

[0127] Hereinafter, the present invention will be described in further detail based on examples, but the present invention is not limited thereto.

[0128] (Example)

[0129] (1) Figure 3 In the front body of the shorts-type diaper shown, the first stress zone area 21L, the second stress zone area 21M and the third stress zone area 21N, and the first absorption part 5L, the second absorption part 5M and the third absorption part 5N corresponding thereto are determined, and they are cut out as measurement samples. The measurement is carried out in the order of (1) and (2) of the aforementioned <Method for measuring shrinkage stress and rigidity in the width direction X>. The length of each measurement sample along the body length direction Y is 30 mm.

[0130] (2) The waist elastic body 73 disposed in the first stress zone region 21L is a rubber thread made of polyurethane fiber material and having a fineness of 620 dtex. Five waist elastic bodies 73 are disposed at intervals of 4.5 mm in the first stress zone region 21L.

[0131] The groin elastic body 74 disposed in the second stress zone area 21M is a rubber thread with a fineness of 620 dtex made of polyurethane fiber. In the second stress zone area 21M, one groin elastic body 74 is disposed so as to be spaced 24 mm apart from the waist elastic body 73 at the lowest end of the first stress zone area 21L.

[0132] No elastic body is arranged in the third stress zone region 21N.

[0133] (3) The absorbent core 5 has a double-layer structure of a skin-side absorbent layer 51 and a non-skin-side absorbent layer 52. The skin-side absorbent layer 51 and the non-skin-side absorbent layer 52 are made of a fiber-stacked body of pulp fibers and superabsorbent polymers. The gram weight of the skin-side absorbent layer 51 is 102 g / cm 2 The non-skin side absorption layer 52 has a gram weight of 100 g / cm 2 .

[0134] The first absorbent part 5L is a part having a laminated structure of the skin-side absorbent layer 51 and the non-skin-side absorbent layer 52 and not including the central slit 511. The basis weight of the first absorbent part 5L is 202 g / cm 2 .

[0135] The second absorbent section 5M has a laminated structure of a skin-side absorbent layer 51 and a non-skin-side absorbent layer 52 and includes a central slit 511 .

[0136] The third absorbent portion 5N has the above-mentioned laminated structure and a single-layer structure consisting of only the side absorbent portions 52 on both sides thereof, and includes a central slit portion 511 and a pair of side slit portions 521 , 521 .

[0137] (Comparative Example)

[0138] exist Figure 3 In the shorts-type diaper shown in the Japanese Patent Laid-Open No. 8-112309, Figure 2 As shown, four elastic bodies are extended in the width direction X in the crotch portion 10C, and the length along the body length direction Y is divided into 30 mm sections and various measurement samples are cut as in Example 1. In the crotch portion 10C, four elastic bodies are made of a rubber thread with a fineness of 620 dtex made of a polyurethane fiber material, and are arranged at intervals of 8 mm. The second stress zone area 21M contains one of the above-mentioned elastic bodies, and the third stress zone area 21N contains three of the above-mentioned elastic bodies, which are different from the embodiment.

[0139] (Measurement)

[0140] The shrinkage stress and rigidity in the width direction X were measured for various test specimens cut out of Examples and Comparative Examples, based on the methods (3) and (4) of <Method for measuring shrinkage stress and rigidity in the width direction X>.

[0141] Furthermore, based on the measured shrinkage stress and rigidity in the width direction X, the ratio (P / Q) of the shrinkage stress (P) of the stress band region to the rigidity (Q) of the absorbing portion is calculated for each stress band region.

[0142] The above results are shown in the following Tables 1 to 3.

[0143] [Table 1]

[0144] Table 1

[0145]

[0146] [Table 2]

[0147] Table 2

[0148]

[0149] [Table 3]

[0150] Table 3

[0151] Example Comparative Example (P1 / Q1) 0.19 0.19 (P2 / Q2) 0.038 0.038 (P3 / Q3) 0 0.29

[0152] As shown in Tables 1 to 3, the diapers of the embodiments are different from the comparative examples in that the shrinkage stress in the width direction X of the outer body and the rigidity of the absorbent core correspond to each other in order. The diapers of such embodiments have confirmed that the fit of the elastic body is maintained from the waist area 21C to the groin area 21D by adopting the above arrangement order, and wrinkles and wrinkles are uniformized. In particular, by arranging the groin area 21D with the groin area elastic body 74 in the groin area 21D in the manner of realizing the above order, the effect of suppressing sagging near the urination part is ensured, and the fit of the diaper 10 is improved.

[0153] The present invention has been described together with the embodiments and examples, but unless otherwise specified, the invention is not intended to be limited to any of the details described, and can be widely interpreted without departing from the spirit and scope of the invention.

[0154] This application claims priority based on Japanese Patent Application No. 2021-176890 filed in Japan on October 28, 2021, the contents of which are incorporated herein by reference as a part of the description of this specification.

[0155] Description of Reference Numerals

[0156] 1 Absorbent body

[0157] 2 outer body

[0158] 21 Front outer body

[0159] 21A Area around the waist opening

[0160] 21B Periiliac region

[0161] 21C Waist area

[0162] 21D Inguinal area

[0163] 21L 1st stress zone area

[0164] 21M Second stress zone area

[0165] 21N third stress zone area

[0166] 22 Rear exterior body

[0167] 3. Frontal film

[0168] 4 Back sheet

[0169] 5. Absorbent core

[0170] 5A The front side of the absorbent core divided into three equal parts

[0171] 5B Divide the absorbent core into three equal parts

[0172] 5C The rear side of the absorbent core divided into three equal parts

[0173] 5L 1st absorption part

[0174] 5M 2nd absorption part

[0175] 5N 3rd absorption part

[0176] 51 Skin side absorption layer

[0177] 52 Non-skin side absorption layer

[0178] 511 Central gap

[0179] 521 Side gap

[0180] 6 Side panels

[0181] 71 Elastic around waist opening

[0182] 72 Periiliac elastic body

[0183] 73 Elastic around waist

[0184] 74 Elastic around the groin

[0185] 78 Elastic around the legs

[0186] 79 Three-dimensional pleated elastic body

[0187] 10. Pants-type diapers

[0188] 10S front part

[0189] 10T rear body

[0190] 10F Ventral part

[0191] 10C Crotch

[0192] 10R Dorsal side

[0193] 11 Side sealing part

[0194] 12 Waist opening

[0195] 13 Leg openings.

Claims

1. A pants-type absorbent article, comprising an absorbent body including a longitudinally long absorbent core and an outer body joined to the non-skin surface side of the absorbent body, including a waist opening for a wearer's waist to pass through and a pair of left and right leg openings for the wearer's legs to pass through, and a front body portion arranged on the front side of the wearer and a back body portion arranged on the back side of the wearer, and having a body length direction and a width direction orthogonal to the body length direction, The pants-type absorbent article is characterized in that: In the front body portion, a plurality of elastic bodies extending in the width direction are arranged on the outer body along the length direction of the body, and contraction stress in the width direction is applied to the elastic bodies. The absorbent core is arranged along the length direction of the body. At a position in the front body portion in the body length direction where the outer body overlaps with the absorbent core, the outer body has a plurality of stress band regions in which the shrinkage stress of the elastic body in the width direction is different from one another along the body length direction, the rigidity of the absorbent core is different in each of the plurality of stress band regions, and the order of the shrinkage stress of the elastic body corresponds to the order of the rigidity of the absorbent core.

2. The pants-type absorbent article according to claim 1, characterized in that: The width of each of the plurality of stress band regions in the length direction is within 30 mm.

3. The pants-type absorbent article according to claim 1 or 2, characterized in that: In the above sequence, the contraction stress and the rigidity gradually decrease from the end portion of the absorbent core on the waist opening side toward the lower portion in the body length direction.

4. The pants-type absorbent article according to claim 1 or 2, characterized in that: The elastic bodies are arranged at a wider pitch between the plurality of stress band regions as the rigidity of the absorbent core is lower.

5. The pants-type absorbent article according to claim 1 or 2, characterized in that: The order of the rigidity of the absorbent core is set by the difference in the basis weight of the absorbent core.

6. The pants-type absorbent article according to claim 1 or 2, characterized in that: The absorbent core has a multi-layer stacked structure, and has a central slit portion extending along the body length direction in the center of the width direction, and a pair of side slit portions extending along the body length direction on the left and right sides of the central slit portion, and the central slit portion is arranged in the multi-layer stacked structure of the absorbent core.

7. The pants-type absorbent article according to claim 6, characterized in that: When the front body portion is viewed in plan, the central slit portion does not overlap with the arrangement positions in the body length direction of two or more of the elastic bodies extending along the width direction.

8. The pants-type absorbent article according to claim 6, characterized in that: The multiple stress band areas include the first stress band area, the second stress band area and the third stress band area starting from the end side of the waist opening side of the absorbent core, the absorbent core overlapping with the first stress band area is located in the part of the multi-layer stacked structure that does not contain the central gap portion, the absorbent core overlapping with the second stress band area contains the central gap portion, and the absorbent core overlapping with the third stress band area contains the central gap and a pair of side gap portions.

9. The pants-type absorbent article according to claim 1 or 2, characterized in that: The plurality of stress band regions include a first stress band region, a second stress band region, and a third stress band region from the end side of the waist opening side of the absorbent core, The shrinkage stress weakens in the order of the first stress zone region, the second stress zone region, and the third stress zone region. The rigidity of the absorbent core becomes weaker in the order of the first stress zone region, the second stress zone region, and the third stress zone region.

10. The pants-type absorbent article according to claim 1 or 2, characterized in that: The outer body has a leg-surrounding elastic body surrounding the leg opening, and in each of the plurality of stress band regions, a portion of the leg-surrounding elastic body extending in a direction intersecting the width direction does not intersect with two or more of the elastic bodies extending in the width direction.

11. The pants-type absorbent article according to claim 1 or 2, characterized in that: A ratio (P / Q) of the contraction stress (P) of the stress zone region to the rigidity (Q) of the absorbing portion is 0.19 or less.

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