WO2023074757A1

WO2023074757A1 - Pant-type absorbent article

Info

Publication number: WO2023074757A1
Application number: PCT/JP2022/039997
Authority: WO
Inventors: 佑水野; 佑馬中尾; 宏子川口; 京子石橋
Original assignee: 花王株式会社
Priority date: 2021-10-28
Filing date: 2022-10-26
Publication date: 2023-05-04
Also published as: JP7260709B1; CN118175981A; JP2023066406A; CN118175981B

Abstract

This pant-type absorbent article comprises: an absorbent body containing a longitudinally elongate absorbent core; an exterior body bonded to a non-skin side of the absorbent body; a waist opening through which a wearer's torso is inserted; a pair of left and right leg openings through which the wearer's legs are inserted; a front body to be located on the wearer's front side; and a back body to be located on the wearer's back side. The pant-type absorbent article has a body length direction and a width direction perpendicular to the body length direction. In the front body, a plurality of stretchable elastic bodies extending along the width direction are provided along the body length direction, whereby contraction stress of the elastic bodies in the width direction is applied to the exterior body. The absorbent core is provided along the body length direction. In the front body, at a location in the body length direction where the exterior body and the absorbent core overlap, the exterior body has a plurality of stress band regions in which the contraction stress of the elastic bodies in the width direction differs from each other in the body length direction. The stiffness of the absorbent core is different from region to region among the plurality of stress band regions. The order of the strength of the contraction stress of the elastic bodies and the order of the level of the stiffness of the absorbent core are in a corresponding relationship.

Description

Pants-type absorbent article

The present invention relates to pants-type absorbent articles such as diapers.

A pants-type absorbent article such as a diaper includes an absorbent core that retains bodily fluids and an outer body, and has a waist opening at the top and leg openings on the left and right sides of the crotch. An elastic body (stretchable member) such as thread rubber is arranged around the waist opening and the leg opening to form gathers, thereby providing a structure that fits the body (for example, Patent Document 1 ~3). Also, there is known a technique of setting a high-rigidity region and a low-rigidity region in the absorbent core according to the wearer's groin by, for example, slanting the basis weight. As a result, it is possible to suppress deterioration in wearability such as sluggishness of the diaper due to swelling after urination.

JP 2012-16435 A JP 2018-079058 A JP 2011-206269 A

The present invention comprises an absorbent main body including an elongated absorbent core and an outer body joined to the non-skin side of the absorbent main body, and includes a waist opening through which a wearer's torso passes and said wearer's legs. Pants having a pair of left and right leg openings for passing through, a front body arranged on the front side of the wearer and a rear body arranged on the back side of the wearer, and having a length direction and a width direction perpendicular to the length direction In the type absorbent article, in the front body, a plurality of stretchable elastic bodies extending along the width direction are arranged in the outer body along the body length direction, and the width of the elastic body direction contraction stress is applied, the absorbent core is disposed along the body length direction, and the outer body is positioned at a position in the body length direction where the outer body and the absorbent core in the front body overlap has a plurality of stress zone areas in which the contraction stress in the width direction of the elastic body differs along the length direction, and the stiffness of the absorbent core differs for each section of the plurality of stress zone areas. 2. A pants-type absorbent article in which the order of strength of shrinkage stress of the elastic body and the order of strength of rigidity of the absorbent core correspond to each other.

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.

1 is a perspective view schematically showing an underpants-type diaper as a preferred embodiment of the underpants-type absorbent article of the present invention. FIG. FIG. 2 is a partially cut-out developed plan view schematically showing a state in which the underpants-type diaper shown in FIG. Fig. 3 is a plan view showing an enlarged front body of the pants-type diaper shown in Fig. 2;

Detailed description of the invention

The present invention relates to an absorbent article that enables uniformity by suppressing the local occurrence of wrinkles and twists while maintaining the fit of the elastic body in the front body.

In the pants-type absorbent article, when the absorbent core includes the above-described high-rigidity region and low-rigidity region, the contraction stress of the elastic body arranged for fitting is applied to the low-rigidity region and the width direction of the absorbent core. If it overlaps, wrinkles and twists are likely to occur locally in that part. In particular, when the underpants-type absorbent article is taken out of the packaging bag and the elastic body is contracted before being worn, partial thickness occurs due to wrinkles and twist deformation, and the appearance is inferior. Partial twisting may cause the pants-type absorbent article to have an distorted shape, which may cause inconvenience when it is carried in a bag. In addition, depending on the degree of deformation such as wrinkles, it may cause deterioration in quality such as absorbency when worn.

On the other hand, in the absorbent article of the present invention, it is possible to uniformize the front body by suppressing the local occurrence of wrinkles and twisting while maintaining the fitting property of the elastic body.

A preferred embodiment of the pants-type absorbent article of the present invention will be described below with reference to the drawings.
In this specification, the side that contacts the wearer's skin is referred to as the skin side or inner side, and the opposite side is referred to as the non-skin side or outer side. These terms are also used as terms that indicate relative positional relationships in the member configuration of the absorbent article, even for members that do not have a surface that contacts the wearer's skin. Further, the direction located in front of the wearer when worn is referred to as the front or front side, and the direction located behind the wearer is referred to as the rear or rear side. The direction normal to the front or back surface of the worn article, that is, the lamination direction of the members, is referred to as the thickness direction.

As shown in FIG. 1, a pants-type diaper 10 (hereinafter, also referred to as a diaper 10) of this embodiment includes a front body 10S arranged on the front side of the wearer and a back body 10T arranged on the back side of the wearer. Prepare. The diaper 10 also has a waist opening 12 through which the wearer's torso passes and a pair of left and right leg openings 13, 13 through which the wearer's legs pass. The diaper 10 has a length direction Y and a width direction X orthogonal to the length direction Y. As shown in FIG. The length direction Y of the diaper 10 corresponds to the vertical direction of the wearer's body, and the waist opening 12 side is also referred to as the upper side and the leg opening 13 side is referred to as the lower side as a relative positional relationship. The width direction X is also referred to as the waist circumference direction X in the diaper 10 shown in FIG.

The front body part 10S and the back body part 10T have an abdominal part 10F and a dorsal part 10R arranged on the wearer's ventral side and dorsal side at positions near the waist opening 12. The ventral portion 10F and the dorsal portion 10R are areas having a length in the length direction Y of the side seal portions 11 to be described later and a width in the width direction X connecting the

side seal portions

11, 11. As shown in FIG. The part of the back part 10S of the front part excluding the ventral part 10F and the part of the back part 10T excluding the back part 10R are connected in the length direction Y to form the crotch part 10C arranged on the crotch side of the wearer. there is

The diaper 10 comprises, as constituent members, an absorbent body 1 including an elongated absorbent core 5 and an outer body 2 joined to the non-skin surface side of the absorbent body 1 . The exterior body 2 forms an external main body covering the entire ventral portion 10F, crotch portion 10C, and back portion 10R. A portion of the outer body 2 placed on the front body 10S is also referred to as a front outer body 21, and a part of the outer body 2 disposed on the rear body part 10T is also referred to as a rear outer body 22.例文帳に追加Both side edges of the abdominal portion 10F of the front exterior body 21 and the dorsal portion 10R of the rear exterior body 22 are overlapped and joined at the side seal portion 11 . Thereby, the abdominal portion 10F and the back portion 10R of the diaper 10 are connected to form an annular portion 10D of the diaper 10. As shown in FIG. Bonding at the side seal portion 11 can be performed by various methods used for this type of article. For example, fusion bonding (eg, heat sealing, ultrasonic sealing, laser melting), pressure bonding (eg, embossing), and other consolidation bonding can be used. Also, the above-described absorptive main body 1 and exterior body 2 can be joined by joining means employed in this type of article, such as a hot-melt adhesive. As for the coating method, a method such as spiral coating that does not increase the rigidity of the member and does not hinder the liquid permeability, air permeability, etc. is used (the same applies to the following bonding).

FIG. 2 shows a state in which the diaper 10 is broken at the

side seal portions

11, 11, expanded and stretched, and viewed from the skin surface side. The unfolded and stretched state (deployed state) refers to a state in which each part is stretched and the pants-type absorbent article is spread flat. In the unfolded state, the aforementioned length direction Y and width direction X correspond to the longitudinal direction Y and width direction X in the unfolded state.
In the unfolded state of the diaper 10, the front section 10S and the back section 10T are separated by a center line CL in the longitudinal direction Y. As shown in FIG.
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 10</b>C are gently constricted inward in the width direction X from the lower edge of the side seal portion 11 . On the other hand, the exterior body 2 has a laterally long shape that protrudes in the width direction X at the ventral portion 10F and the dorsal portion 10R.
The vertically long absorbent main body 1 is arranged along the body length direction Y with its longitudinal direction facing the body length direction Y of the diaper 10 in the center region in the width direction X on the skin surface side of the outer package 2. there is

The absorbent body 1, as shown in FIG. It has a liquid-retaining absorbent core 5. The absorbent core 5 is an aggregate of absorbent material that absorbs and retains bodily fluids, and may be covered with a hydrophilic core wrap sheet such as crepe paper. The absorbent core 5 has the same width (length in the width direction X) as that of the absorbent main body 1 and is slightly shorter in length in the length direction Y than the absorbent main body 1 . A preferred embodiment of the structure of the absorbent core 5 will be described later.
Furthermore, the absorbent main body 1 is provided with a pair of side sheets 6 on both sides in the longitudinal direction Y. As shown in FIG. A three-dimensional gathered elastic body 79 is attached to the inner end of the side sheet 6 in the width direction X in a stretched state along the longitudinal direction Y so that it can stand up against the wearer's skin when worn. Three-dimensional gathers are formed.

Next, the front body 10S will be described.
A plurality of stretchable elastic bodies extending along the width direction X are arranged along the length direction Y in the outer body 2 (front side outer body 21) of the front body 10S.
More specifically, in the outer body 2 of the abdominal portion 10F of the front body 10S (the region in the width direction X corresponding to the length of the side seal portion 11 in the length direction Y), the waist opening of the waist opening peripheral region 21A The waist-surrounding elastic body 71, the ilium-surrounding elastic body 72 of the ilium-surrounding region 21B adjacent to the lower side thereof, and the waist-surrounding elastic body 73 of the waist-surrounding region 21C adjacent to the lower side thereof are arranged in plurality in each region. It is Each elastic body extends in the width direction in a stretched state, and is joined by

side seal portions

11, 11 at the left and right ends of the ventral portion 10F so as to be stretchable. The region around the iliac bone 21B is a region that is assumed to come into contact with the region from the iliac crest to the anterior superior iliac spine of the wearer.

The absorbent core 5 arranged in the longitudinal direction Y is laminated on the outer body 2 from the lower part of the ilium-surrounding region 21B to the waist-surrounding region 21C and further to the crotch region 10C. In the laminated portion of the outer package 2 and the absorbent core 5, the ilium-surrounding elastic body 72 and the waist-surrounding elastic body 73 are partially cut. The ends of the cut

elastic bodies

72 and 73 are joined to the outer body 2 at positions overlapping the left and right sides of the absorbent core 5, and are stretchable between the other ends joined to the side seal portions 11. has been Thus, the ilium-surrounding elastic body 72 and the waist-surrounding elastic body 73 extend in the width direction X on both the left and right sides of the absorbent core 5 at positions where the absorbent core 5 and the height position in the body length direction Y overlap each other. there is The left and right

elastic bodies

72 and 73 separated by partial cutting are on the same line along the width direction X, respectively.

Elastic bodies

72 and 73, which are divided into left and right and are on the same line, are subjected to contraction stress of the elastic bodies to the outer body 2 and the absorbent core 5 on the same line. Therefore, even if the elastic bodies are divided into left and right, the elastic bodies on the same line can be functionally regarded as one elastic body. When counting the number of elastic bodies, the elastic bodies divided into left and right in this way and lying on the same line are regarded as one.

Furthermore, in the outer body 2 at the portion where both side edges of the crotch portion 10C of the front body 10S begin to constrict inward in the width direction X from the lower edge of the side seal portion 11, the groin-surrounding elastic body 74 of the groin-surrounding region 21D is are distributed. The groin-surrounding region 21D is a region that is assumed to come into contact with a region connecting the upper ends of the wearer's groin.
The groin-surrounding elastic body 74 extends in the width direction X in a stretched state and is joined at both ends in the width direction X of the groin-surrounding region 21D. In addition, the groin-surrounding elastic body 74 is partially cut at the layered portion with the absorbent core 5 and joined to the exterior body 2 at positions overlapping both the left and right sides of the absorbent core 5 . In FIG. 2, the groin-surrounding elastic body 74 is divided into left and right by partial cutting, and one piece is arranged on the same line along the width direction X. As shown in FIG. The number of groin-surrounding elastic bodies 74 is not limited to that shown in FIG. 2, and may be two or more. However, from the viewpoint of suppressing the occurrence of product wrinkles due to shrinkage stress, it is preferable that one groin-surrounding elastic body 74 is arranged in the groin-surrounding region 21D.

In the front body 10S, a plurality of various stretchable elastic bodies extending along the width direction X as described above are arranged along the body length direction Y, and the shrinkage stress of the elastic bodies in the width direction X is It is attached to the exterior body 2 .

The waist opening elastic body 71 of the waist opening surrounding area 21A, the ilium elastic body 72 of the ilium surrounding area 21B, the waist elastic body 73 of the waist area 21C, and the groin area of the groin area 21D. The elastic bodies 74 are different in number, pitch, and type (diameter, material) so as to apply contraction stress according to each region. The numbers and pitches of various elastic bodies are not limited to those shown in FIG. 2, and can take various forms. The various elastic bodies are preferably sandwiched between two layers of non-woven fabric sheets or the like constituting the exterior body 2 and fixed so as to be stretchable.

In the exterior body 2 of the front body 10S, a leg-surrounding elastic body 78 extends along a direction intersecting the width direction X in addition to the elastic body extending along the width direction X. . More specifically, the leg-surrounding elastic bodies 78 extend in the width direction X from the lower end regions of the left and right side seal portions 11 of the ventral portion 10F, and then extend in the downward direction crossing the width direction X. , and along the curved portions of both side edges of the crotch portion 10</b>C that are gently constricted inward in the width direction X. In this way, the leg elastics 78 are arranged along the leg openings 13 . Further, the leg-surrounding elastic body 78 extends inward in the width direction X in the vicinity of the center line CL in the longitudinal direction Y while changing its direction.

Various

elastic bodies

71, 72, and 73 are arranged in the dorsal part 10R of the rear part 10T as well as the ventral part 10F of the front part 10S. In addition, the absorbent core 5 along the longitudinal direction is laminated on the dorsal part 10R and the crotch part 10C of the rear part 10T in the same manner as in the case of the front part 10S. Further, in the rear body part 10T, similarly to the front body part 10S, leg-circumference elastic bodies 78 are arranged along the leg openings 13 . However, the leg-surrounding elastic body 78 in the back body 10T extends slightly toward the front body 10S beyond the center line CL in the longitudinal direction Y, changes its direction inward in the width direction X at that position, and extends to the front body 10S. It overlaps with the leg circumference elastic body 78 in .

At the position in the body length direction Y where the outer body 2 and the absorbent core 5 overlap in the front body 10S, the outer body 2 has a plurality of has a stress band area of The stress band region means the region of the entire width direction X of the outer covering 2 at the position in the length direction Y where the outer covering 2 overlaps the absorbent core 5 . The shrinkage stress in the width direction X of each stress band region is appropriately set according to the number, pitch, and type (diameter, material) of the elastic bodies. When the absorbent core 5 is multi-layered, the end on the side of the waist opening 12 of "the position in the length direction Y where the outer body 2 overlaps the absorbent core 5" is specified as a portion where all the layers are laminated. , the portion where the number of layers of the absorbent core 5 is not uniform on the side of the waist opening 12 is not included.
Each stress band region is divided at a position where at least one of the pitch and type (diameter, material) of various elastic bodies extending along the width direction X is switched. A change in pitch of more than ±10% from the predetermined spacing switches the stress band regions. The boundary of each area is the edge of the area directly above or the edge of the bottom elastic body. The length (width) in the length direction Y of each stress zone region is preferably within 30 mm. By setting the length (width) of each stress band region in the length direction Y to 30 mm or less, the outer body 2 can be adapted to follow finer contour changes of the wearer's body shape. For example, the outer body 2 can finely follow changes in the body shape from the lower abdomen to the crotch, such as the roundness of the wearer's abdomen and the depression at the boundary between the groin and the abdomen.

In the embodiment shown in FIG. 3, the plurality of stress zone regions are arranged from the end of the absorbent core 5 on the side of the waist opening 12 to the first stress zone region 21L, the second stress zone region 21M, and the third stress zone. It includes region 21N. At that time, when the absorbent core 5 is multi-layered as described above, the first stress zone region 21L is specified from the portion where all the layers are laminated on the waist opening 12 side. In FIG. 3, the absorbent core 5 is indicated by a solid line for understanding the arrangement relationship between the stress zone region and the absorbent core 5, and the constituent members of the absorbent main body 1 other than the absorbent core 5 are omitted. there is

Each of the above-mentioned stress zone regions is classified as follows based on the classification criteria described above at positions in the length direction Y where the outer covering 2 overlaps the absorbent core 5 .
That is, the first stress zone region 21L extends from the lower side of the ilium-surrounding elastic body 72 at the lower end of the ilium-surrounding region 21B directly above to the lower side of the waist-surrounding elastic body 73 at the lower end of the waist region 21C. It is an area up to The first stress zone region 21L includes the entire width direction X between the

side seal portions

11, 11 of the exterior body 2 in the range divided in the length direction Y described above.
The second stress zone region 21M is a region from the lower side of the waist elastic body 73 at the lower end of the waist region 21C to the lower side of the groin elastic body 74 in the groin region 21D. The second stress zone region 21M includes the entire width direction X of the exterior body 2 in the range divided in the length direction Y described above.
The third stress zone region 21N extends from the lower side of the groin-surrounding elastic body 74 in the groin-surrounding region 21D to the front side 5A of the absorbent core 5 equally divided into three parts (front side 5A, middle 5B, and rear side 5C). This is the area up to the rest. The third stress zone region 21N includes the entire region in the width direction X of the exterior body 2 within the range divided in the length direction Y described above.
In the embodiment shown in FIG. 3, contraction stresses in the width direction X are different among the first stress band region 21L, the second stress band region 21M, and the third stress band region 21N. The difference in shrinkage stress in the width direction X is appropriately set according to the correspondence between the fitting property of the diaper 10 and the rigidity of the absorbent core 5 . Preferred aspects of this shrinkage stress and stiffness will be described later.
The plurality of stress band regions of the outer body 2 in the front body 10S are not limited to the three regions described above, and may be two regions or four or more regions.

Regarding the absorbent core 5 laminated for each stress zone area, the rigidity of the absorbent core 5 differs for each section of the plurality of stress zone areas. The rigidity of the absorbent core 5 can be appropriately set depending on the basis weight, thickness, and the like.

The order of strength of shrinkage stress of the elastic body in the exterior body 2 and the order of strength of the rigidity of the absorbent core 5 correspond to each other. That is, in the order, the portion of the elastic body in the exterior body 2 where the shrinkage stress is relatively strong corresponds to the portion of the absorbent core 5 where the rigidity is relatively high. A portion with relatively weak shrinkage stress corresponds to a portion with relatively low rigidity of the absorbent core 5 . The contraction stress in the width direction X of the stress zone region of the outer body 2 is relatively strengthened at the portion where the stiffness of the absorbent core 5 is relatively high, and the outer body 2 or the absorbent core 5 in that portion is applied to the wearer's skin. Improve the fit of At the same time, the contraction stress in the width direction X of the stress zone region of the outer body 2 is relatively weakened in the area where the rigidity of the absorbent core 5 is relatively low, so that the wrinkles and twists of the outer body 2 that are likely to occur in that portion, and furthermore, Partially distorted deformation due to this can be suppressed.
As a result, the front section 10S of the diaper 10 can be made uniform by suppressing the local occurrence of wrinkles and twisting while maintaining the fit property of the elastic body. For example, the absorptive core 5 may have a high-rigidity area in the center and low-rigidity areas on both sides thereof by slanting the basis weight corresponding to the urination point and the groin on both sides. The shrinkage stress applied to the core 5 can be made uniform. Along with this, the shrinkage stress applied to the exterior body 2, which is affected by the rigidity of the absorbent core 5, can be made uniform. As a result, it is possible to achieve a uniform balance of wrinkles and the like as well as the fitting property of the elastic body and the accompanying liquid leakage prevention property. That is, it is possible to prevent sharp gradients of wrinkles and the like due to contraction of the elastic body and to moderate changes in the presence or absence of wrinkles and improve the quality of the diaper 10 as a whole. By equalizing the balance of wrinkles and the like, the diaper 10 in which the elastic body is in a contracted state before wearing is less likely to deform partially distortedly, and the portability when carrying in a bag is improved. In addition, even when the diaper 10 is worn, wrinkles are less likely to remain in the outer body 1, and deformation such as local wrinkles of the outer body 1 that is elongated with the elongation of various elastic bodies is suppressed, and the skin surface and the like are suppressed. The floating between them can also be suppressed. As a result, when the diaper 10 is worn, the physical properties of the elastic body and the structural performance of the front body 10S work together to further improve the fit when worn. In addition, the improvement of the fitting property accompanied by the suppression of deformation such as local wrinkles suppresses the leakage of bodily fluids, further enhancing the liquid leakage prevention property.
In addition, even when the absorbent core 5 is made thinner, such uniformity makes it possible to suppress distorted deformation due to the aforementioned wrinkles and twists of the exterior body 2 . By reducing the thickness and suppressing wrinkles, etc., the silhouette of the diaper 10 when worn can be made more sleek, and the diaper 10 can be worn like an undergarment, thereby creating a comfortable feeling of wearing.

In the front body 10S of the diaper 10, the correspondence relationship between the strength order of contraction stress in the width direction X of the elastic body and the strength order of the rigidity of the absorbent core 5 according to the division of the plurality of stress zone regions is the diaper 10 can be appropriately set according to the purpose. For example, in the embodiment shown in FIG. 3, the shrinkage stress in the width direction X is strong, medium, and weak in the order of the first stress zone region 21L, the second stress zone region 21M, and the third stress zone region 21N. can be strong, weak, or medium. Also, the rigidity may be high, medium, and low in the order of the first absorbent portion 5L, the second absorbent portion 5M, and the third absorbent portion 5N of the absorbent core 5 corresponding to this division. It can be medium. From the viewpoint of improving the slip-off prevention property and fitting property when wearing the diaper 10 and surely absorbing the excreted urine that flows along and improving the liquid leakage prevention property, in the above three categories, the waist area on the side of the waist opening 12 It is preferable that the contraction stress in the width direction X of the first stress zone region 21L at 21C is the strongest, and the rigidity of the first absorbent portion 5L of the absorbent core 5 corresponding to this is the highest.

In particular, regarding the order, the contraction stress in the width direction X of the elastic body and the rigidity of the absorbent core 5 are stepwise from the end of the absorbent core 5 on the side of the waist opening 12 toward the lower side in the length direction Y. is preferably reduced to For example, in the embodiment shown in FIG. 3, the contraction stress in the width direction X is set to high, medium, and weak in the order of the first stress band region 21L, the second stress band region 21M, and the third stress band region 21N. It is preferable that the rigidity of the first absorbent portion 5L, the second absorbent portion 5M, and the third absorbent portion 5N of the absorbent core 5 corresponding to .
As a result, in the front section 10S of the diaper 10, it is possible to more reliably achieve good fit and liquid leakage prevention when the diaper 10 is worn, and uniformity of wrinkles and the like before wearing. In addition, when the diaper 10 is worn, local deformation due to wrinkles and twists is suppressed. In addition, it is possible to reduce sluggishness due to partial deformation on the crotch portion 10C side when worn. More specifically, the first stress zone region 21L of the outer package 2 and the first absorbent portion 5L of the absorbent core 5 correspond to the waist region 21C of the front body 10S of the diaper 10, and as described above, the diaper 10 The slip-off prevention and fitting properties are improved, and the liquid leakage prevention against leakage of excreted urine and the like is enhanced. The second stress band region 21M of the outer body 2 and the second absorbent portion 5M of the absorbent core 5 adjacent on the lower side thereof correspond to the groin region 21D of the front body 10S of the diaper 10, and correspond to the groin region of the wearer. While securing the mobility of the foot, it has a followability to the skin surface corresponding to the bending of the base of the foot, suppresses floating due to wrinkles etc. at that part, and has a soft fit to the skin. Furthermore, the third stress zone region 21N of the outer body 2 and the third absorbent portion 5N of the absorbent core 5 adjacent on the lower side thereof correspond to the region around the lower abdomen of the front body 10S of the diaper 10, and the region around the groin. While securing the movement of the wearer in conjunction with the mobility with respect to the region 21D, it suppresses floating due to wrinkles and the like, and gently encloses the raised portion of the wearer's lower abdomen to improve the fit.
From these points of view, one groin elastic body 74 is included in the second stress band region 21M of the armor 2, and an elastic body extending in the width direction X is provided in the third stress band region 21N of the armor 2. is preferably not included. In addition, it is preferable that the absorbent core 5 has a structure of a skin-side absorbent portion 51 and a skin-side absorbent portion 52, which will be described later, in contrast to the structure of the exterior body 2. As shown in FIG.

<Method for Measuring Shrinkage Stress and Rigidity in Width Direction X>
The shrinkage stress and stiffness in the width direction X are measured by the following method.
(1) First, the underpants-type absorbent article to be measured is broken at the side seal portions 11, and the position in the length direction Y where the absorbent core 5 and the exterior body 2 overlap in the front body portion 10S is specified. At that position, each stress band region over the entire width direction of the armor body 2 defined at the position where at least one of the pitch and type (diameter, material) of various elastic bodies contained in the armor body 2 is switched, and Each absorbent part divided in the length direction Y of the corresponding absorbent core 5 is specified. The boundary of each area is the edge of the area directly above or the edge of the bottom elastic body. If the switching position cannot be specified, the length (width) in the length direction Y is determined for the area corresponding to the front side 5A obtained by dividing the absorbent core 5 into three equal parts, and each stress zone area and each absorbent part are divided equally. identify. For example, the length (width) in the length direction Y shall be 30 mm or less.
(2) Next, using a cooling means such as cold spray, the bonding strength of the adhesive or the like that joins the outer package 2 and the absorbent main body 1 including the absorbent core 5 is weakened, and the outer package 2 and the absorbent core 5 are separated from each other. The core 5 is separated. Each stress zone region is cut out from the separated armor 2 . Further, each absorbent part is cut out from the separated absorbent core 5 .
(3) Contraction stress in the width direction X of the stress band region:
Both ends in the width direction X in each stress zone region of the exterior body 2 are fixed with chucks, and the maximum stress when stretched 60 mm in the width direction X under the measurement conditions of a speed of 300 mm / min using an autogram tester. to measure. For example, when the length of the stress band region to be measured in the width direction X is 165 mm, and the chuck width at each end is 15 mm, the chuck width of 135 mm is extended to 195 mm and returned to 135 mm, and the maximum Measure the stress. This measured value is converted into a value in units of 30 mm in the length direction Y, and the converted value is defined as the shrinkage stress in the width direction X of each stress band region. For the autogram test, for example, "RTA-100" manufactured by Orientec can be used.
(4) Rigidity of Absorbent Core 5:
Both ends in the width direction X of each absorbent part of the absorbent core 5 are fixed with a chuck, and using a large bendability tester, each 40 mm portion from the center and side ends in the width direction X is bent, and the bending at that time Measure each moment. The average value is taken as the stiffness of each absorbing portion. For example, KES FB2-L (manufactured by Kato Tech Co., Ltd.) can be used as the large bendability tester.

In the above-described configuration of the front body 10S in which the order of strength of shrinkage stress of the elastic body in the outer body 2 and the order of strength of the rigidity of the absorbent core 5 correspond to each other, the stress zone regions corresponding to the order and the absorbent portion It is preferable that there is the following relationship between them. That is, the ratio (P/Q) of the shrinkage stress (P) of the stress band region to the stiffness (Q) of the absorbing portion is preferably as small as possible from the viewpoint of more effectively suppressing the formation of wrinkles in the stress band region. Typically, it is 0 or more, preferably 0.19 or less, more preferably 0.10 or less, and even more preferably 0.05 or less.

Within the range of the above ratio (P/Q), 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, from the viewpoint of preventing the diaper from slipping off. , 0.5 N/30 mm or more is more preferable. In addition, 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 from the viewpoint of reducing tightening of the diaper. preferable.
In the embodiment shown in FIG. 3, when the contraction stress is reduced stepwise toward the lower side in the body length direction Y, the contraction stress (P1) of the first stress band region 21L and the contraction stress (P1) of the second stress band region 21M The difference (P1-P2) from the shrinkage stress (P2) is 0.1 N/, from the viewpoint of balancing suppression of waist slippage when worn and suppression of poor appearance due to large horizontal wrinkles in the diaper when not worn. 30 mm or more is preferable, 0.3 N/30 mm or more is more preferable, and 0.5 N/30 mm or more is still more preferable. The difference (P1-P2) is preferably 1.2 N/30 mm or less, more preferably 1.0 N/30 mm or less, from the viewpoint of suppressing appearance defects due to uneven formation of wrinkles in the diaper when not worn, and 0 0.8 N/30 mm or less is more preferable.
In addition, 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 0.1 N/30 mm or more is preferable, 0.3 N/30 mm or more is more preferable, and 0.5 N/30 mm or more is still more preferable. The difference (P2-P3) is preferably 1.2 N/30 mm or less, more preferably 1.0 N/30 mm or less, from the viewpoint of suppressing appearance defects due to uneven formation of wrinkles in the diaper when not worn, and 0 0.8 N/30 mm or less is more preferable.

In addition, in the range of the ratio (P/Q), the rigidity (Q) of each absorbent section divided in the length direction Y suppresses the settling of each absorbent section due to shrinkage stress (maintains the product shape). From the viewpoint, it is preferably 1.0 gf·cm/cm or more, more preferably 1.5 gf·cm/cm or more, and still more preferably 2.0 gf·cm/cm or more. In addition, the stiffness (Q) of each absorbent part is preferably 10.0 gf cm / cm or less, and preferably 8.5 gf cm / cm or less, from the viewpoint of preventing deterioration in softness of the product due to hardening of each absorbent part. More preferably, it is 7.0 gf·cm/cm or less.
In the embodiment shown in FIG. 3, when the rigidity is decreased stepwise toward the lower side in the body length direction Y, the rigidity (Q1) of the first absorbent section 5L and the rigidity (Q2) of the second absorbent section 5M are The difference (Q1-Q2) is preferably 0.3 gf cm / cm or more, more preferably 0.4 gf cm / cm or more, from the viewpoint of imparting a change in the sensory hardness of the material, and 0.4 gf cm / cm or more. 5 gf·cm/cm or more is more preferable. The difference (Q1-Q2) is preferably 8.0 gf cm/cm or less, more preferably 6.0 gf cm/cm, from the viewpoint of suppressing the formation of bending points of the absorbent core 5, which are the starting points of creases in the product. The following is more preferable, and 4.0 gf·cm/cm or less is even more preferable. In addition, the difference (Q2-Q3) between the stiffness (Q2) of the second absorbent portion 5M and the stiffness (Q3) of the third absorbent portion 5N is set to 0.5 from the viewpoint of suppressing sagging of the absorbent core 5 when worn. It is preferably 3 gf·cm/cm or more, more preferably 0.5 gf·cm/cm or more, and still more preferably 0.7 gf·cm/cm or more. The difference (Q2-Q3) is preferably 8.0 gf cm / cm or less, more preferably 6.0 gf cm / cm or less, and 4.0 gf cm from the viewpoint of suppressing lateral wrinkles of the product when not attached. cm/cm or less is more preferable.

In the plurality of stress zone regions of the front body 10S, it is preferable that the elastic bodies are arranged at a wider pitch as the rigidity of the absorbent core 5 decreases. For example, in the embodiment shown in FIG. 3, when the order of strength of the contraction stress and the order of height of the structure are gradually decreased toward the lower side in the body length direction Y as described above, the following is the case. It is preferable to That is, the pitch of the groin elastic body 74 in the second stress zone region 21M and the waist elastic body directly above the groin elastic body 74 are higher than the pitch of the waist elastic body 73 in the first stress zone region 21L. It is preferable to widen the pitch between the bodies 73 .
As a result, it is possible to suppress excessive concentration of stress on the exterior body 2 and the absorbent core 5 due to the arrangement of the elastic bodies at a narrow pitch, and the above-mentioned effect of uniforming wrinkles and twists is further enhanced. Increased.

In addition, the order of rigidity of the absorbent core 5 in the front body 10S is preferably set according to the difference in basis weight of the absorbent core 5 .

Next, preferred embodiments of the structure of the absorbent core 5 will be described below.

2 and 3 show a preferred embodiment of the structure of the absorbent core 5. FIG.
The absorbent core 5 extends along the body length direction Y from the lower end of the ilium-surrounding region 21B in the ventral portion 10F of the front body 10S to the ilium-surrounding region 22B in the dorsal portion 10R of the rear body 10T. ing.
The absorbent core 5 has a laminated structure of a skin-side absorbent layer 51 and a non-skin-side absorbent layer 52 in the embodiment shown in FIGS. The skin-side absorbent layer 51 and the non-skin-side absorbent layer 52 are aggregates of absorbent materials that absorb and retain bodily fluids. These may be covered with a hydrophilic core wrap sheet such as crepe paper.
While the non-skin-side absorbent layer 52 is rectangular, the skin-side absorbent layer 51 has a shorter length in the longitudinal direction Y than the non-skin-side absorbent layer 52, has an uneven length in the width direction X, and is T-shaped. shape. Specifically, when the absorbent core 5 is divided into three equal parts along the longitudinal direction Y: the front side 5A, the middle 5B, and the back side 5C, the non-skin-side absorbent layer 52 has a uniform width in the width direction X, It has a rectangular shape that occupies the entire front side 5A, middle 5B and rear side 5C. The skin-side absorbent layer 51 maintains a shape in which the width in the width direction X is widest in the front side 5A in a predetermined range in the longitudinal direction Y, and the width gradually narrows toward the middle 5B and the rear side 5C from there. It is The skin-side absorbent layer 51 has a length in the longitudinal direction Y extending from the front side 5A to the middle 5B and remaining in a portion of the back side 5C.
The laminated structure of the absorbent core 5 is not limited to the two layers described above, and may have three or more layers.

In addition, the absorbent core 5 has a central slit portion 511 extending along the body length direction Y in the center of the width direction X, and a pair of sides extending along the body length direction Y on both left and right sides of the central slit portion 511. It has square slit

portions

521 , 521 . The central slit portion 511 is arranged in a multilayer structure of the absorbent core 5 . The central slit portion 511 and the side slit portions 521 are portions lacking the absorbent material forming the absorbent core 5 at those positions, and the basis weight of the absorbent core 5 is reduced at those portions. The central slit portion 511 and the side slit portions 521 may be a predetermined depth from the skin surface side, and may be through holes extending over the entire thickness of the absorbent core 5 .
The central slit portion 511 is arranged in a multi-layered structure of the skin-side absorbent layer 51 and the non-skin-side absorbent layer 52, and is a through hole extending through both layers. The central slit portion 511 extends linearly along the longitudinal direction Y from a position on the front side 5A where the width of the skin-side absorbent layer 51 starts to narrow to a midpoint of the middle portion 5B. The central slit portion 511 extends from the lower end portion of the second stress zone region 21M of the exterior body 2 to a position slightly exceeding the center line CL in the longitudinal direction Y and entering the rear viewing period 10T.
The side slit portion 521 extends in the longitudinal direction Y along the side edge of the narrowed portion of the skin-side absorbent layer 51 . In other words, the side slit portion 521 is a through hole in the non-skin side absorbent layer 52 alone. The side slit portion 511 extends along the longitudinal direction from a position on the crotch portion 10C side of the central through hole 511 of the front side 5A to a part of the rear side 5C. The side slit portion 521 extends from the third stress zone region 21N of the exterior body 2 beyond the center line CL in the longitudinal direction Y to a position near the center of the rear viewing portion 10T.
In the absorbent core 5 , it is possible to control the difference in the rigidity of the entire absorbent core 5 from becoming too large by providing a basis weight reduction portion with the slit portion as described above. As a result, the accuracy of uniformity of wrinkles, twists, and the like in the diaper 10 can be further improved.

Due to the above configuration, the absorptive core 5 is configured such that the basis weight and the rigidity of the front body 10S are reduced in order along the length direction Y from the waist opening 12 side. More specifically, the absorbent core 5 has (i) a plurality of laminated structures of the skin-side absorbent layer 51 and the non-skin-side absorbent layer 52 along the body length direction Y and does not include the central slit portion 511 . , (ii) a portion of the laminated structure including the central slit portion 511, (iii) a one-layer structure of the laminated structure and the side absorbent portions 52 on both sides thereof together with the central slit portion 511 and the pair of side slit portions The grammage is reduced in the order of 521 and the portion including 521, and the rigidity is reduced.

Regarding the absorbent core 5 having the structure described above, the first absorbent portion 5L of the absorbent core 5 overlapping the first stress zone region 21L of the outer package 2 is located in the portion (i). The second absorbent portion 5M of the absorbent core 5 overlapping the second stress zone region 21M of the outer package 2 is the portion (ii) and includes the central slit portion 511 . The third absorbent portion 5N of the absorbent core 5, which overlaps with the third stress zone region 21N of the outer package 2, is the portion (iii) and includes a central slit portion 511 and a pair of side slit

portions

521, 521. there is
The above correspondence relationship makes it difficult to form wrinkles due to contraction stress in the width direction of each stress zone region, and makes it possible to homogenize the amplitude and number of wrinkles formed in each region.
In addition, since the first absorbent portion 5L of the absorbent core 5 overlaps the first stress zone region 21L of the outer body 2, it is necessary to fit the waist, so the contraction stress is maintained and the wrinkles of the product are reduced to the maximum. be able to.
Wrinkles are most likely to form in the above-mentioned (i) region among the three regions, and wrinkles are most difficult to form in the above-mentioned region (iii). By overlapping with the second stress zone region 21M, the region (ii) becomes wrinkled in the middle, and the wrinkles are less noticeable when the product is viewed as a whole.
By overlapping the third absorbent portion 5N of the absorbent core 5 with the third stress zone region 21N of the outer body 2, it is possible to prevent the load from being applied to the leg around the crotch. On the other hand, since the third absorbent portion 5N of the absorbent core 5 has the lowest rigidity, wrinkles are likely to be formed even with a slight stress load, but the corresponding third stress zone region 21N of the exterior body 2 is substantially not subjected to shrinkage stress. Due to the area, wrinkles formed in the product are slight.

The diaper 10 includes the absorbent core 5 having the structure described above, and in the front body 10S, there is a corresponding relationship between the degree of contraction stress of the elastic body in the outer body 2 and the degree of rigidity of the absorbent core 5. . Furthermore, the contraction stress in the width direction X of the elastic body in the outer package 2 and the rigidity of the absorbent core 5 are measured from the end of the absorbent core 5 on the side of the waist opening 12 toward the lower side in the length direction Y. gradually made smaller.

In a plan view of the front body 10S of the diaper 10, it is preferable that the center slit portion 511 does not overlap the arrangement positions in the length direction Y of two or more elastic bodies extending along the width direction X. As a result, it is possible to more effectively suppress the occurrence of wrinkles and twists in the laminated structure of the absorbent core 5 starting from the central slit portion 511 .

Further, in each of the plurality of stress band regions of the front body 10S, the portion of the leg-surrounding elastic body 78 that extends along the direction intersecting the width direction X extends along the width direction X. It is preferable not to cross two or more elastic bodies. As a result, it is possible to prevent the leg-surrounding elastic body 78 from becoming a starting point of wrinkles, twists, etc. due to being sandwiched between two or more elastic bodies extending in the width direction X and being affected by stress. can.

Materials used for this type of article can be used without particular limitation for the materials constituting the members constituting the diaper 10 .
For example, the various elastic bodies can be those commonly used in this type of article. Examples of materials include synthetic rubbers such as styrene-butadiene, butadiene, isoprene and neoprene, natural rubber, EVA, elastic Polyolefin, polyurethane, etc. can be mentioned, and as a form, a thread-like or string-like (flat rubber, etc.) having a rectangular, square, circular, polygonal cross section, etc., or a multi-filament type thread-like one is used. be able to. Specifically, the thread rubber having the fineness described above is used.

The exterior body 2 may be composed of one layer or composed of two or more layers, and in either case, nonwoven fabrics, laminates of nonwoven fabrics and resin films, porous films, etc. may be used as constituent members. In addition, it is preferable for the exterior body 2 to have liquid impermeability from the viewpoint of leak prevention, and it is preferable for the exterior body 2 to have air permeability and water vapor permeability in order to prevent an excessive increase in humidity in the diaper. preferable.

The surface sheet 3 forming the absorbent main body 1 is preferably a hydrophilic thermal-bonded nonwoven fabric, particularly an air-through nonwoven fabric, from the viewpoints of quickly absorbing and transferring excreted bodily fluids to the absorbent body and from the viewpoint of good texture. It is preferable that the surface sheet 3 is made of hydrophilically treated thermoplastic resin fibers, and that the fibers are three-dimensional crimped fibers such as secondary or tertiary crimps. Specifically, polyethylene, polypropylene, polyester, nylon, and composite fibers thereof are prepared, cut into a predetermined length, and coated with various hydrophilizing agents before forming staples. Hydrophilizing agents include various alkylsulfonates represented by α-olefin sulfonates, acrylates, acrylate/acrylamide copolymers, esteramides, salts of esteramides, polyethylene glycol and derivatives thereof, water Hydrophilization treatment using hydrophilizing agents known to those skilled in the art such as polyether resins, various silicone derivatives, various sugar derivatives, and mixtures thereof can be used.

The back sheet 4 is not particularly limited as long as it prevents the permeation of liquid and has moisture permeability. etc. are melt-kneaded to form a film, and the film is uniaxially or biaxially stretched to obtain a porous film. Polyolefin is mentioned as said thermoplastic resin. Examples of the polyolefin include high to low density polyethylene, linear low density polyethylene, polypropylene, polybutene and the like, and these can be used alone or in combination.

The absorbent core 5 may be a mixture of hydrophilic fibers and superabsorbent polymer particles, a mixture of hydrophilic fibers, superabsorbent polymer particles and thermoplastic synthetic resin fibers, or a superabsorbent material between a plurality of fiber sheets. water-absorbing sheets in which organic polymer particles are sandwiched. As the hydrophilic fibers, fibers having a hydrophilic surface can be used, and examples thereof include cellulose fibers and synthetic fibers which are hydrophilized with a surfactant or the like, if necessary. In the case of the mixture, the entire mixture is covered with a liquid-permeable sheet such as tissue paper or hydrophilic fiber non-woven fabric in order to prevent the mixture from losing its shape and falling off of the polymer particles. As the polymer particles, starch-based, cellulose-based, and synthetic polymer-based particles can be used.

As the side sheet 6, a water-repellent nonwoven fabric is preferable, and water-repellent nonwoven fabrics selected from spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, heat roll nonwoven fabrics, needle punch nonwoven fabrics, etc., or various water repellent nonwoven fabrics are used. be able to. Particularly preferably, for example, spunbond nonwovens, spunbond-meltblown (SM) nonwovens, spunbond-meltblown-spunbond (SMS), spunbond-meltblown-meltblown-spunbond (SMMS), spunbond-spunbond-meltblown - Spunbond (SSMS) non-woven fabrics, etc. are used.

The underpants absorbent article of the present invention may be for infants or adults, and may be in a form other than a diaper. For example, as forms other than diapers, sanitary shorts, shorts-type napkins, disposable shorts, and the like may be used.

Regarding the above-described embodiment, the present invention further discloses the following pants-type absorbent article.

<1>
A pair of left and right waist openings through which a wearer's torso is passed and said wearer's legs are passed through. A pants-type absorbent article having a leg opening, a front body arranged on the front side of the wearer and a back body arranged on the back side of the wearer, and having a length direction and a width direction orthogonal to the length direction and
In the front body, a plurality of stretchable elastic bodies extending in the width direction are arranged in the outer body along the body length direction, and contractive stress in the width direction is applied to the elastic bodies. and the absorbent core is arranged along the body length direction,
At a position in the body length direction where the outer body and the absorbent core overlap on the front body, the outer body has a plurality of stresses in which the contraction stresses of the elastic body in the width direction are different from each other along the body length direction. It has band regions, and the stiffness of the absorbent core is different for each of the plurality of stress band regions, and the order of strength of contraction stress of the elastic body corresponds to the order of strength of the stiffness of the absorbent core. in a relationship to
A pants-type absorbent article.

<2>
The underpants-type absorbent article according to <1>, wherein each of the plurality of stress zone regions has a width of 30 mm or less in the length direction.
<3>
In the order, the contraction stress and the rigidity are decreased stepwise from the end of the absorbent core on the waist opening side toward the lower side in the length direction, the <1> or <2>, the pants-type absorbent article.
<4>
The pants type according to any one of <1> to <3>, wherein between the plurality of stress zone regions, the elastic bodies are arranged at a wider pitch as the rigidity of the absorbent core decreases. absorbent article.
<5>
The underpants-type absorbent article according to any one of <1> to <4> above, wherein the order of rigidity of the absorbent core is set by a difference in basis weight of the absorbent core.
<6>
The absorbent core has a central slit portion extending along the body length direction at the center in the width direction, and a pair of side slit portions extending along the body length direction on both left and right sides of the central slit portion. , and the central slit portion is arranged in a multilayer structure of the absorbent core, the pants-type absorbent article according to any one of <1> to <5>.
<7>
The underpants type according to <6>, wherein, in a plan view of the front body, the central slit portion does not overlap with the arrangement position of the two or more elastic bodies extending along the width direction in the length direction. absorbent article.
<8>
The plurality of stress band regions includes a first stress band region, a second stress band region and a third stress band region from the waist opening side of the absorbent core, and the first stress band region and The overlapping absorbent core is in a portion of the laminated structure of the plurality of layers that does not include the central slit portion, and the absorbent core overlapping the second stress zone region includes the central slit portion and the third stress zone. The pants-type absorbent article according to <6> or <7>, wherein the absorbent core overlapping the region includes the central slit and the pair of side slit portions.
<9>
The plurality of stress zone areas includes a first stress zone area, a second stress zone area and a third stress zone area from the waist opening side end side of the absorbent core,
The shrinkage stress becomes weaker in the order of the first stress band region, the second stress band region, and the third stress band region,
The pants-type absorbent according to any one of <1> to <8>, wherein the stiffness of the absorbent core decreases in the order of the first stress zone area, the second stress zone area, and the third stress zone area. sexual goods.
<10>
The armor body has a leg-surrounding elastic body surrounding the leg opening, and the leg-surrounding elastic body extends along a direction intersecting the width direction in each of the plurality of stress zone regions. The underpants-type absorbent article according to any one of <1> to <9>, wherein no part crosses two or more of the elastic bodies extending along the width direction.
<11>
The ratio (P/Q) of the shrinkage stress (P) of the stress zone region to the stiffness (Q) of the absorbent part is 0.19 or less, preferably 0.10 or less, more preferably 0.05 or less, The pants-type absorbent article according to any one of <1> to <10>.

The present invention will be described in more detail below based on examples, but the present invention should not be construed as being limited thereto.

(Example)
(1) In the front body of the pants-type diaper shown in FIG. The portion 5M and the third absorption portion 5N were identified and cut out as measurement samples. This was carried out according to the procedures (1) and (2) of <Method for Measuring Shrinkage Stress and Rigidity in the Width Direction X>. The length along the length direction Y of various measurement samples was 30 mm.
(2) The waist elastic body 73 arranged in the first stress zone region 21L is a thread rubber made of a polyurethane fiber material and having a fineness of 620 dtex. In the first stress zone region 21L, five waist elastic bodies 73 were arranged at intervals of 4.5 mm.
The groin-surrounding elastic body 74 arranged in the second stress zone region 21M is made of thread rubber made of polyurethane fibers and having a fineness of 620 dtex. In the second stress zone region 21M, one groin elastic body 74 was arranged at a pitch of 24 mm from the lowermost waist elastic body 73 of the first stress zone region 21L.
No elastic body was placed in the third stress zone region 21N.
(3) The absorbent core 5 has a two-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 laminated bodies of pulp fibers and superabsorbent polymers. The amount was 100 g/cm ² .
The first absorbent portion 5L has a laminated structure of the skin-side absorbent layer 51 and the non-skin-side absorbent layer 52 and is a portion that does not include the central slit portion 511 . The basis weight of the first absorbent portion 5L was set to 202 g/cm ² .
The second absorbent portion 5</b>M has a layered structure of the skin-side absorbent layer 51 and the non-skin-side absorbent layer 52 and includes the central slit portion 511 .
The third absorbent portion 5N is a portion including a central slit portion 511 and a pair of side slit

portions

521, 521 in addition to a one-layer structure consisting of the laminated structure and the side absorbent portions 52 on both sides thereof.

(Comparative example)
In the pants-type diaper shown in FIG. 3, as shown in FIG. 2 of Japanese Patent Application Laid-Open No. 8-112309, four elastic bodies are extended in the width direction X in the crotch portion 10C, and the same as in Example 1 Then, various measurement samples were cut out by dividing the length along the length direction Y into 30 mm. The four elastic bodies in the crotch portion 10C were made of thread rubber made of polyurethane fibers and having a fineness of 620 dtex, and were arranged at intervals of 8 mm. The difference from the embodiment is that the second stress zone region 21M includes one elastic body, and the third stress zone region 21N includes three elastic bodies. rice field.

(measurement)
The shrinkage stress in the width direction X and the shrinkage stress in the width direction X and the Stiffness was measured.
Also, based on the measured contraction stress and stiffness in the width direction X, the ratio (P/Q) of the contraction stress (P) of the stress band region to the stiffness (Q) of the absorbing portion was calculated for each stress band region.
The above results were as shown in Tables 1 to 3 below.

As shown in Tables 1 to 3 above, in the diapers of Examples, unlike Comparative Examples, the contraction stress in the width direction X of the outer packaging and the rigidity of the absorbent core corresponded to each other. It has been confirmed that the diapers of the above-described embodiments achieve uniformity of wrinkles and twists from the waist region 21C to the groin region 21D while maintaining the fitting property of the elastic body according to the above order. did it. In particular, by arranging the groin-surrounding elastic member 74 in the groin-surrounding region 21D so as to realize the above order, the diaper 10 is improved in fit by maintaining the function of suppressing sagging in the vicinity of the urinating portion.

While the present invention has been described in conjunction with its embodiments and examples, we do not intend to limit our invention in any detail to the description unless otherwise specified, and the spirit and spirit of the invention as set forth in the appended claims. We believe that it should be interpreted broadly without violating scope.

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. taken in as a part.

1 Absorbent Main Body 2 Exterior Body 21 Front Exterior Body 21A Waist Opening Area

21B Ilium Area

21C Waist Area

21D Inguinal Area 21L First Stress Zone Area 21M Second Stress Zone Area 21N Third Stress Zone Area 22 Rear exterior body 3 Top sheet 4 Back sheet 5 Absorbent core 5A Front side obtained by dividing the absorbent core into three equal parts 5B Middle part obtained by dividing the absorbent core into three equal parts 5C Rear side obtained by dividing the absorbent core into three equal parts 5L First absorbent part 5M second absorbent part 5N third absorbent part 51 skin-side absorbent layer 52 non-skin-side absorbent layer 511 central slit 521 side slit 6 side sheet 71 waist opening elastic 72 ilium elastic 73 waist elastic Body 74 Elastic body around groin 78 Elastic body around leg 79 Three-dimensional gathered elastic body 10 Pants-type diaper

10S Front body

10T Back body 10F Abdominal part 10C Crotch part 10R Back part 11 Side seal part 12 Waist opening 13 Leg opening

Claims

A pair of left and right waist openings through which a wearer's torso is passed and said wearer's legs are passed through. A pants-type absorbent article having a leg opening, a front body arranged on the front side of the wearer and a back body arranged on the back side of the wearer, and having a length direction and a width direction orthogonal to the length direction and
In the front body, a plurality of stretchable elastic bodies extending in the width direction are arranged in the outer body along the body length direction, and contractive stress in the width direction is applied to the elastic bodies. and the absorbent core is arranged along the body length direction,
At a position in the body length direction where the outer body and the absorbent core overlap on the front body, the outer body has a plurality of stresses in which the contraction stresses of the elastic body in the width direction are different from each other along the body length direction. It has band regions, and the stiffness of the absorbent core is different for each of the plurality of stress band regions, and the order of strength of contraction stress of the elastic body corresponds to the order of strength of the stiffness of the absorbent core. in a relationship to
A pants-type absorbent article.
The pants-type absorbent article according to claim 1, wherein each of the plurality of stress zone regions has a width of 30 mm or less in the body length direction.
3. The order according to claim 1 or 2, wherein the contraction stress and the rigidity are decreased stepwise from the end of the absorbent core on the waist opening side toward the lower side in the length direction. pants-type absorbent article.
The pants-type absorbent according to any one of claims 1 to 3, wherein between the plurality of stress zone regions, the elastic bodies are arranged at a wider pitch as the rigidity of the absorbent core decreases. Goods.
The pants-type absorbent article according to any one of claims 1 to 4, wherein the order of rigidity of the absorbent core is set by a difference in basis weight of the absorbent core.
The absorbent core has a central slit portion extending along the body length direction at the center in the width direction, and a pair of side slit portions extending along the body length direction on both left and right sides of the central slit portion. 6. The pants-type absorbent article according to any one of claims 1 to 5, wherein the central slit portion is arranged in a multilayer structure of the absorbent core.
7. The underpants-type absorbency according to claim 6, wherein, in a plan view of the front body, the central slit portion does not overlap the arrangement positions of the two or more elastic bodies extending along the width direction in the length direction. Goods.
The plurality of stress band regions includes a first stress band region, a second stress band region and a third stress band region from the waist opening side of the absorbent core, and the first stress band region and The overlapping absorbent core is in a portion of the laminated structure of the plurality of layers that does not include the central slit portion, and the absorbent core overlapping the second stress zone region includes the central slit portion and the third stress zone. 8. The pants-type absorbent article according to claim 6 or 7, wherein said absorbent core overlapping regions includes said central slit and a pair of said side slit portions.
The plurality of stress zone areas includes a first stress zone area, a second stress zone area and a third stress zone area from the waist opening side end side of the absorbent core,
The shrinkage stress becomes weaker in the order of the first stress band region, the second stress band region, and the third stress band region,
The pants-type absorbent article according to any one of claims 1 to 8, wherein the stiffness of the absorbent core decreases in the order of the first stress zone area, the second stress zone area, and the third stress zone area. .
The armor body has a leg-surrounding elastic body surrounding the leg opening, and the leg-surrounding elastic body extends along a direction intersecting the width direction in each of the plurality of stress zone regions. The pants-type absorbent article according to any one of claims 1 to 9, wherein no portion crosses two or more of said elastic bodies extending along said width direction.
The ratio (P/Q) of the shrinkage stress (P) of the stress zone region to the stiffness (Q) of the absorbent portion is 0.19 or less, preferably 0.10 or less, more preferably 0.05 or less. Item 11. The underpants-type absorbent article according to any one of items 1 to 10.