Underpants-type absorbent article

Abstract

To provide an underpants-type absorbent article which can reduce marks left on a skin while suppressing stuffiness occurring in a waist region in a worn state.SOLUTION: A diaper 1 includes an exterior body 2 and an absorbent body 3. The exterior body 2 includes an outer layer sheet 22, an inner layer sheet 23, and plural strips of elastic members 24 arranged between both of the sheets in a lateral direction Y in an extended state. A joined part 5 where an abdominal side part A and a back side part B are heat-sealed includes a plurality of belt-like, belt-like seal parts 27 intermittently formed in one direction. The belt-like seal part 27 includes a first elastic member arranged part 10 where the elastic member 24 is arranged between two joined parts 5 that are adjacent in one direction. In the first elastic member arranged part 10, the joined part 5 overlapped with the elastic member 24 is not formed, and an interval between the two joined parts 5 that are adjacent in one direction is wider than a standard interval of the joined parts 5 formed on the belt-like seal part 27.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a pant-type absorbent article.

Background Art

[0002] As an absorbent article such as a disposable diaper, there is known an absorbent main body including a liquid-permeable surface sheet, a liquid-impermeable back sheet, and a vertically long absorber disposed between both sheets. As such an absorbent article, for example, the absorbent article described in Patent Document 1 has been proposed.

[0003] The absorbent article described in Patent Document 1 discloses an absorbent article having a plurality of joined portions intermittently joined to a side seal portion. The side seal portion of this absorbent article has a plurality of patterns formed by the joined portions, and by forming different patterns in these disposable absorbent articles, these disposable absorbent articles can be made distinguishable from each other.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] It is desirable that the absorbent article can improve breathability and suppress the generation of stuffiness while reducing the traces around the wearer's waist in the worn state. However, in conventional absorbent articles, during the wearing of the absorbent article, the interior thereof tends to have an increased humidity and become stuffy due to the wearer's urination or sweating. Therefore, marks caused by the elastic members provided in the absorbent article and skin troubles such as redness and itching of the wearer's skin were likely to occur. In particular, in disposable diapers, since the peripheral portion around the waist adheres closely to the wearer's skin, sweating is likely to occur in these close-contact portions, and skin troubles such as marks around the wearer's waist are likely to occur. The absorbent article described in Patent Document 1 has not been studied at all regarding suppressing the generation of stuffiness in the worn state and reducing the marks around the wearer's waist, and there is room for improvement.

[0006] Therefore, an object of the present invention relates to providing a pant-type absorbent article that can suppress the generation of stuffiness around the waist in the worn state while reducing marks on the skin.

Means for Solving the Problems

[0007] The present invention relates to a pant-type absorbent article including an outer cover and an absorbent body fixed to the outer cover. As one embodiment, it is preferable that the pant-type absorbent article has a longitudinal direction along the front-back direction of the wearer and a transverse direction orthogonal to the longitudinal direction. As one embodiment, it is preferable that the outer cover includes a ventral side portion disposed on the ventral side of the wearer and a dorsal side portion disposed on the dorsal side of the wearer. As one embodiment, it is preferable that in the pant-type absorbent article, both end portions of the ventral side portion and both end portions of the dorsal side portion are joined to form a pair of side seal portions, a waist opening portion, and a pair of leg opening portions. As one embodiment, it is preferable that the outer cover includes an outer layer sheet disposed on the side farther from the wearer's body, an inner layer sheet located on the side closer to the wearer's body, and a plurality of elastic members disposed in an extended state along the transverse direction between these two sheets. As one embodiment, it is preferable that the joint portion where the ventral side portion and the dorsal side portion are heat-sealed has a belt-shaped seal portion formed intermittently in a row along one direction. As one embodiment, it is preferable that the belt-shaped seal portion has a first elastic member arrangement portion in which the elastic member is arranged between two adjacent joint portions in the one direction. As one embodiment, it is preferable that no joint portion overlapping the elastic member is formed in the first elastic member arrangement portion, and the interval between two adjacent joint portions in the one direction is wider than the standard interval of the joint portions formed in the belt-shaped seal portion.

Advantages of the Invention

[0008] According to the present invention, it is possible to provide a pant-type absorbent article that can reduce the appearance of marks on the skin while suppressing the generation of stuffiness around the waist in the worn state.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0010] The pant-type absorbent article of the present invention will be described below based on its preferred embodiments with reference to the drawings. The disposable diaper 1 of the pants type according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. As shown in FIG. 1, the disposable diaper 1 of the pants type of the present embodiment includes an outer body 2 and an absorbent main body 3 fixed to the outer body 2. Further, as shown in FIG. 2, the disposable diaper 1 of the pants type has a longitudinal direction X along the front-back direction of the wearer and a lateral direction Y orthogonal to the longitudinal direction. Further, the outer body 2 has a ventral portion A arranged on the ventral side of the wearer and a dorsal portion B arranged on the dorsal side of the wearer during wearing, and both ends of the ventral portion A and both ends of the dorsal portion B in the lateral direction Y are joined in a palm-like shape to form a pair of side seal portions S, S. Further, by this joining, a waist opening WO and a pair of leg openings LO are formed.

[0011] The outer body 2 in the diaper 1 of the present embodiment has a ventral sheet member 2A forming the ventral portion A and a dorsal sheet member 2B forming the dorsal portion B. In the pair of side seal portions S, S, both ends in the lateral direction Y of the ventral sheet member 2A and both ends in the lateral direction Y of the dorsal sheet member 2B are joined. The ventral portion A or the dorsal portion B of the outer body 2 or the ventral or dorsal sheet members constituting them may have a narrow region where the ventral portion A and the dorsal portion B are not joined at both ends in the lateral direction Y, for example, a region of 10 mm or less. Even in that case, it is included that both ends in the lateral direction Y are joined.

[0012] The diaper 1 is divided into a ventral portion A arranged on the ventral side of the wearer during wearing, a dorsal portion B arranged on the dorsal side of the wearer during wearing, and a crotch region C between the ventral portion A and the dorsal portion B. The ventral portion A, the dorsal portion B, and the crotch region C in the unfolded and extended state of the diaper 1 are shown in FIG. 2. Here, the unfolded and extended state of the diaper 1 described above means that, as shown in FIG. 2, the side seal portion S is peeled off to put the diaper 1 in an unfolded state, and the diaper 1 in the unfolded state is expanded until each elastic member of each part is extended to the design dimensions (the same as the dimensions when flattened in a state where the influence of the elastic member is completely eliminated). Further, in this specification, the state where the diaper 1 is extended means that each elastic member of each part provided in the diaper 1 is extended until it reaches the design dimensions (the same as the dimensions when flattened in a state where the influence of the elastic member is completely eliminated). Also, for the diaper 1 in the unfolded and extended state, a virtual straight line that bisects the diaper 1 in the lateral direction Y and extends in the longitudinal direction X is defined as the longitudinal center line CLy, and a virtual straight line that bisects the diaper 1 in the longitudinal direction X and extends in the lateral direction Y is defined as the lateral center line CLx.

[0013] Also, in this specification, the "skin-facing surface" means the surface of the diaper 1 or its constituent member (for example, the absorbent body 3) that faces the wearer's skin side during wearing, and the "non-skin-facing surface" means the surface of the diaper 1 or its constituent member that faces the side opposite to the wearer's skin side (the clothing side) during wearing. Also, in the diaper 1, the longitudinal direction X is the direction extending from the ventral side portion A to the dorsal side portion B in a state of being unfolded and extended on a plane, and is the direction along the front-back direction of the wearer. The lateral direction Y is a direction orthogonal to the longitudinal direction X, and is the width direction of the diaper 1 in a state of being unfolded and extended on a plane. In addition, in this specification, "downward" means the side of the crotch region C with respect to the comparison target portion in the longitudinal direction X of the diaper 1. "Upward" means the side of the waist opening WO with respect to the comparison target portion in the longitudinal direction X of the diaper 1.

[0014] In the present embodiment, as shown in FIG. 2, the ventral part A and the dorsal part B each have a waist region D1 that forms the peripheral edge of the waist opening WO, a torso circumference region D2 that is located inward in the longitudinal direction X (below the diaper 1) from the waist region D1, and a lower torso circumference region D3 that is located inward in the longitudinal direction X (below the diaper 1) from the region D2. The torso circumference region D2 is preferably the torso circumference region D2 corresponding to the part from the iliac crest to the anterior superior iliac spine of the wearer. Here, the iliac crest and the anterior superior iliac spine are anatomical terms. The waist region D1 is located at the outermost side in the longitudinal direction X of each of the ventral part A and the dorsal part B, and includes a longitudinal end 1E (hereinafter, also referred to as "longitudinal end 1E"), which is one of both ends of the diaper 1 in the longitudinal direction X. The longitudinal end 1E of the diaper 1 is also the longitudinal end of the outer body 2. In the present invention, the waist region D1, the torso circumference region D2, and the lower torso circumference region D3 are the respective regions when the side seal portion S is divided into three in the longitudinal direction X. The length of the waist region D1 in the longitudinal direction X is 25% of the total length of the side seal portion S in the longitudinal direction X, the length of the torso circumference region D2 in the longitudinal direction X is 40% of the total length of the side seal portion S in the longitudinal direction X, and the length of the lower torso circumference region D3 in the longitudinal direction X is 35% of the total length of the side seal portion S in the longitudinal direction X. In the present embodiment, the ventral part A and the dorsal part B are basically configured in the same manner, and unless otherwise specified, the description of either one is applicable to the other.

[0015] In the diaper 1 of the present embodiment, the ventral sheet member 2A and the dorsal sheet member 2B constituting the outer body 2 each include an outer layer sheet 22 that forms the outer surface of the diaper 1, an inner layer sheet 23 disposed on the inner surface side of the outer layer sheet 22, and a plurality of filamentous elastic members 24 disposed in an extended state along the lateral direction Y between both sheets 22 and 23. The elastic members 24 are arranged at substantially equal intervals in the longitudinal direction X. Note that the elastic members 24 of the diaper 1 are arranged at substantially equal intervals in the longitudinal direction X, but they do not necessarily have to be arranged at equal intervals. In the diaper 1 of the present embodiment, the outer layer sheet 22 is a sheet disposed on the side farther from the wearer's body, and the inner layer sheet 23 is a sheet located on the side closer to the wearer's body in the outer package 2. FIG. 2 is a view seen from the side closer to the wearer's body, and the inner layer sheet 23 of the outer package 2 can be confirmed.

[0016] The outer layer sheet 22 and the inner layer sheet 23 are joined via an adhesive by applying an adhesive such as a hot melt type adhesive directly to the elastic member 24 with a comb gun or the like and disposing the elastic member 24 between the outer layer sheet 22 and the inner layer sheet 23. From the viewpoint of ensuring the strength between the outer layer sheet 22 and the inner layer sheet 23, the distance between two adjacent elastic members 24 is preferably 2 mm or more and 10 mm or less, more preferably 3 mm or more and 9 mm or less, and even more preferably 4 mm or more and 8 mm or less.

[0017] Preferred materials for the adhesive applied to the elastic member 24 include amorphous polyolefins, ethylene-vinyl acetate copolymers (EVA), ethylene-acrylic ester copolymers (EEA), styrene-butadiene-styrene block copolymers (SBS), styrene-isoprene-styrene block copolymers (SIS), styrene-ethylene / butylene-styrene block copolymers (SEBS), styrene-ethylene / propylene-styrene block copolymers (SEPS), and other thermoplastic polymers and mixtures thereof. The adhesive is preferably of the hot melt type.

[0018] The absorbent body 3 has a liquid-permeable top sheet 31, a liquid-impermeable back sheet 32, and an absorber 33 disposed therebetween (see FIG. 3). The absorber 33 is composed of an absorbent core made of an aggregate of fibers such as pulp fibers or a non-woven fabric, or an absorbent core having particles of a water-absorbing polymer held therein, and a core wrap sheet (not shown) covering the absorbent core. Liquid-impermeable includes both liquid-proof and liquid-resistant. Further, leak-proof cuffs 34, 34 made of a material having liquid resistance or water repellency and air permeability are formed on both side portions along the longitudinal direction X of the absorbent body 3. Near the free ends of the pair of leak-proof cuffs 34, a leak-proof cuff elastic member 35 is arranged in an extended state. During wearing of the diaper 1, the leak-proof cuff elastic member 35 contracts, causing the leak-proof cuff 34 to stand up, thereby preventing the outflow of liquid from the absorbent body 3 outward in the lateral direction Y. As the top sheet 31, the back sheet 32, and the absorbent core and core wrap sheet of the absorber 33, those conventionally used in this type of absorbent article can be used. An outer wrapper sheet such as a non-woven fabric or a film can be disposed on the outside of the absorbent body 3, overlapping the back sheet 32.

[0019] As shown in FIG. 2, the diaper 1 has a strip-shaped seal portion 27. Specifically, the diaper 1 of the present embodiment has a joint portion 5 where the outer layer sheet 22 and the inner layer sheet 23 are heat-sealed in the ventral portion A and the dorsal portion B, and the joint portion 5 forms a plurality of strip-shaped seal portions 27 intermittently along one direction. Such joining can use known joining means such as heat sealing, ultrasonic sealing, or high-frequency sealing. The strip-shaped seal portion 27 can be provided at any part of the ventral portion A and the dorsal portion B. In the present embodiment, the strip-shaped seal portions 27 are formed on both sides of the longitudinal center line CLy. Specifically, both of the side seal portions S, S are the strip-shaped seal portions 27. Although one of the side seal portions S, S may be the strip-shaped seal portion 27, from the viewpoint of improving the flexibility of the side seal portion S and reducing the trace, it is preferable that both of the side seal portions S, S are the strip-shaped seal portions 27.

[0020] As shown in FIG. 4, the side seal portion S of the diaper 1 has a joint portion 5 intermittently formed in the longitudinal direction X so as to overlap or not overlap with an elastic member 24 arranged along the lateral direction Y. Specifically, as shown in FIG. 4(a), the elastic member 24 is arranged so as not to overlap with the joint portion 5, and the interval between two adjacent joint portions 5 in the longitudinal direction X is wider than the standard interval P of the joint portion 5 (hereinafter, also referred to as the "first elastic member arrangement portion 10"), or as shown in FIG. 4(b), it is arranged so as to overlap with the joint portion 5, or as shown in FIG. 4(c), it is arranged so as not to overlap with the joint portion 5. Hereinafter, as shown in FIG. 4(a), the elastic member 24 arranged in the first elastic member arrangement portion 10 is also referred to as the "first elastic member 24a". Note that FIG. 4 is a schematic plan view of the diaper 1 in a two-folded state as viewed from the non-skin-facing side, and the two-folded state is a state in which the skin-facing side of the ventral portion and the skin-facing side of the dorsal portion are overlapped to form a flat plate shape. In the first elastic member arrangement portion 10, the portion wider than the standard interval P of the joint portion 5 can be formed by providing a location in the side seal portion S (belt-like seal portion 27) where the joint portions 5 are not arranged at the standard interval P. For example, in FIG. 5(a1), the first elastic member arrangement portion 10 is formed by not forming one of the joint portions 5 among the joint portions 5 arranged at the standard interval P. Alternatively, the first elastic member arrangement portion 10 may be formed by not forming a plurality of consecutive joint portions 5. For example, as shown in FIG. 5(a2), the first elastic member arrangement portion 10 may be formed by not forming two consecutive joint portions 5.

[0021] In this specification, the distance L1 in the longitudinal direction X of the first elastic member arrangement portion 10 is defined as the distance between the upper side 5u and the lower side 5d of two joint portions 5R adjacent to the first elastic member arrangement portion 10 in the longitudinal direction X, as shown in FIGS. 5(a1) and (a2). In FIGS. 5(a1) and (a2), the non-joint portion 5' indicated by the dotted line is the location where the joint portion 5 would be formed if the joint portion 5 were formed at the standard interval P.

[0022] The joint portions 5 are preferably distributed at a standard interval P over the entire length in the longitudinal direction X of the side seal portion S. The standard interval P of the joint portions 5 is preferably 0.5 mm or more, more preferably 1 mm or more, still more preferably 1.5 mm or more, and is preferably 7 mm or less, more preferably 6 mm or less, still more preferably 4 mm or less. Further, it is preferably 0.5 mm or more and 7 mm or less, more preferably 1 mm or more and 6 mm or less, still more preferably 1.5 mm or more and 4 mm or less. Note that the standard interval P of the joint portions 5 is the distance between adjacent joint portions 5 as shown in FIG. 4, for example, the distance between the upper side 5u and the lower side 5d.

[0023] <Method for measuring the standard interval P> From the strip-shaped seal portion 27 (side seal portion S), a standard sample region is selected in which at least 5 or more, preferably 10 or more joint portions are formed at regular intervals along the longitudinal direction of the strip-shaped seal portion 27, and the arithmetic mean value of the intervals between adjacent joint portions existing within the standard sample region is defined as the standard interval P. As the standard sample region, it is also preferable to select a plurality of regions spaced apart in the longitudinal direction of the strip-shaped seal portion 27 with the first elastic member arrangement portion 10 or the second elastic member arrangement portion 11 interposed therebetween, and define the arithmetic mean value of the interval P obtained for each of those regions as the standard interval P.

[0024] The diaper 1 of the present embodiment has a first elastic member arrangement portion 10 in the side seal portion S (strip-shaped seal portion 27), and no joint portion 5 overlapping the elastic member 24 is formed in the first elastic member arrangement portion 10. In addition, in the first elastic member arrangement portion 10, the interval between two joint portions 5 adjacent in the longitudinal direction X (one direction) to the first elastic member arrangement portion 10 is wider than the standard interval P of the joint portions 5. With such a configuration, the vapor generated from the liquid absorbed by the absorber 33 is easily dissipated from the first elastic member arrangement portion 10 to the outside of the diaper 1. As a result, moisture is less likely to accumulate inside the diaper 1, so that it is possible to suppress the occurrence of sweating around the waist in the worn state, and since it is less likely to cause the wearer's skin to become puffy due to the sweating, it is possible to effectively suppress the formation of marks on the skin by the elastic member 24.

[0025] From the perspective of further achieving the above-described effects, the distance L1 in the vertical direction X of the first elastic member arrangement portion 10 is preferably 1.0 mm or more, more preferably 1.5 mm or more. Also, from the perspective of ensuring the strength of the side seal portion S, the distance L1 in the vertical direction X of the first elastic member arrangement portion 10 is preferably 9.0 mm or less, more preferably 7.0 mm or less. Considering the above, the distance L1 in the vertical direction X of the first elastic member arrangement portion 10 is preferably 1.0 mm or more and 9.0 mm or less, and more preferably 1.5 mm or more and 7.0 mm or less. Also, from the same perspective as above, the distance L1 in the vertical direction X of the first elastic member arrangement portion 10 is preferably 110% or more, more preferably 150% or more, with respect to the standard interval P of the joint portion 5, and is preferably 500% or less, more preferably 300% or less, and is preferably 110% or more and 500% or less, and more preferably 150% or more and 300% or less.

[0026] The joint portion 5 of the diaper 1 in the present embodiment is, as shown in FIG. 5, a horizontally long rectangular shape that is long in the horizontal direction Y, and has an upper side 5u and a lower side 5d along the horizontal direction Y. Further, the joint portion 5 has an inner side 5n and an outer side 5g that extend along the vertical direction X and connect between the upper side 5u and the lower side 5d. Since the joint portion 5 in the present embodiment is a horizontally long rectangular shape that is long in the horizontal direction Y, it is advantageous in terms of improving the air permeability of the diaper 1. From the perspective of ensuring the strength of the side seal portion S, the area of the joint portion 5 is preferably 0.5 mm 2 or more, more preferably 1.0 mm 2 or more. Also, from the perspective of improving the air permeability of the diaper 1, the area of the joint portion 5 is preferably 5.0 mm 2 or less, more preferably 2.5 mm 2 or less. Considering the above, the area of the joint portion 5 is preferably 0.5 mm 2 or more and 5.0 mm 2 or less, and more preferably 1.0 mm 2 or more and 2.5 mm 2 or less. From the viewpoint of improving the strength of the side seal portion S and the air permeability of the diaper 1, the upper side 5u and the lower side 5d are preferably 0.5 mm or more and 7.0 mm or less, more preferably 1.0 mm or more and 6.0 mm or less, and still more preferably 2.0 mm or more and 5.0 mm or less. From the same viewpoint as above, the inner side 5n and the outer side 5g are preferably 0.1 mm or more and 5.0 mm or less, more preferably 0.2 mm or more and 3.0 mm or less, and still more preferably 0.3 mm or more and 1.0 mm or less. In the plan view of the present embodiment, the contour of the joint portion 5 is a horizontally long rectangular shape that is long in the horizontal direction Y, but may be other shapes such as a triangle, a square, a circle, an ellipse, or the like.

[0027] <Method for Measuring the Area of the Joint Portion 5> First, the side seal portion S of the diaper 1 was cut along the vertical direction X to prepare a measurement piece. Next, the joint portion 5 in the measurement piece was photographed at a magnification of 80 times using a microscope VH-Z20UR manufactured by KEYENCE Corporation to obtain an image of the observation field of view. Then, image analysis was performed using VHX-10000 manufactured by KEYENCE Corporation to calculate the area (mm 2 ) of the joint portion 5. Such measurement was performed 10 times, and the arithmetic mean value of the obtained areas was determined and taken as the area of the joint portion 5.

[0028] As shown in FIG. 4(d), the side seal portion S (belt-like seal portion 27) of the diaper 1 may have a second elastic member arrangement portion 11. The second elastic member arrangement portion 11 is a portion where an elastic member 24 is arranged between two adjacent joining portions 5 (hereinafter also referred to as joining portions 5s) in the longitudinal direction X (one direction), and has a small joining portion 6 whose length in the lateral direction Y (a direction orthogonal to the one direction) is shorter than that of the two adjacent joining portions 5s. Hereinafter, as shown in FIG. 4(d), the elastic member 24 arranged in the second elastic member arrangement portion 11 is also hereinafter referred to as "second elastic member 24b". Since the diaper 1 has the small joining portion 6, the vapor generated from the liquid absorbed by the absorber 33 can be easily dissipated from the second elastic member arrangement portion 11 to the outside of the diaper 1. Therefore, the air permeability of the diaper 1 is further improved, moisture is less likely to accumulate inside the diaper 1, and the occurrence of sweating around the waist in the wearing state can be suppressed. Further, the second elastic member 24b arranged in the second elastic member arrangement portion 11 is preferably arranged so as to have a portion overlapping the small joining portion 6, but may be arranged so as not to overlap the small joining portion 6. Further, from the viewpoint of improving the air permeability of the diaper 1, as shown in FIG. 4(d), the small joining portion 6 is preferably provided on the end side, that is, the outer side in the lateral direction Y of the ventral side sheet member 2A and the dorsal side sheet member 2B, but may be provided on the inner side.

[0029] As shown in FIG. 5(d1), for example, the second elastic member arrangement portion 11 can be formed by replacing one joining portion 5 with a small joining portion 6. Further, the second elastic member arrangement portion 11 may be formed by replacing a plurality of joining portions 5 with a plurality of small joining portions 6. For example, as shown in FIG. 5(d2), the second elastic member arrangement portion 11 may be formed by replacing three consecutive joining portions 5 with small joining portions 6. In this specification, as shown in FIGS. 5(d1) and (d2), the distance L2 in the longitudinal direction X of the second elastic member arrangement portion 11 is the distance between the upper side 5u and the lower side 5d of the two joining portions 5s adjacent to the second elastic member arrangement portion 11 in the longitudinal direction X.

[0030] From the viewpoint of improving the air permeability of the diaper 1, the area of the small joint portion 6 is preferably 95% or less, more preferably 80% or less, compared to the area of the joint portion 5s. From the viewpoint of improving the strength of the side seal portion S, the area of the small joint portion 6 is preferably 10% or more, more preferably 20% or more, compared to the area of the joint portion 5s. Considering the above, the area of the small joint portion 6 is preferably 10% or more and 90% or less, more preferably 20% or more and 80% or less, compared to the area of the joint portion 5s. Here, the area of the joint portion 5s refers to the average of the areas of two joint portions 5s adjacent to the small joint portion 6 in the vertical direction X. From the viewpoints of improving the air permeability of the diaper 1 and the strength of the side seal portion S, the area of the small joint portion 6 is preferably 0.1 mm 2 or more and 1.1 mm 2 or less, and more preferably 0.3 mm 2 or more and 1.0 mm 2 or less. From the viewpoints of improving the strength of the side seal portion S and the air permeability of the diaper 1, for the upper side 6u and the lower side 6d of the small joint portion 6, it is preferably 0.1 mm or more and 4.5 mm or less, more preferably 0.2 mm or more and 3.0 mm or less, and even more preferably 0.5 mm or more and 1.5 mm or less. From the same viewpoints as above, for the inner side 6n and the outer side 5g of the small joint portion 6, it is preferably 0.1 mm or more and 4.0 mm or less, more preferably 0.2 mm or more and 2.0 mm or less, and even more preferably 0.3 mm or more and 0.8 mm or less. In plan view, the contour of the small joint portion 6 is a horizontally long rectangular shape that is long in the horizontal direction Y, but it may also be other shapes such as a triangle, square, circle, ellipse, etc.

[0031] From the viewpoint of improving the air permeability of the diaper 1, the distance L2 in the vertical direction X of the second elastic member arrangement portion 11 is preferably 1.0 mm or more, more preferably 2.0 mm or more. Also, from the viewpoint of ensuring the strength of the side seal portion S, the distance L2 in the vertical direction X of the second elastic member arrangement portion 11 is preferably 15.0 mm or less, more preferably 10.0 mm or less. Considering the above, the distance L2 in the vertical direction X of the second elastic member arrangement portion 11 is preferably 1.0 mm or more and 15.0 mm or less, more preferably 2.0 mm or more and 10.0 mm or less. Also, from the same perspective as above, the distance L2 in the longitudinal direction X of the second elastic member arrangement portion 11 is preferably 110% or more, more preferably 150% or more, with respect to the standard interval P of the joint portion 5, and is preferably 600% or less, more preferably 500% or less, and is preferably 110% or more and 600% or less, more preferably 150% or more and 500% or less.

[0032] From the perspective of achieving both not constricting the abdomen and fixing the diaper 1 so that it does not slip off, it is preferable that the lateral contraction stress Y of the elastic member 24 in the body circumference region D2 and the lower body circumference region D3 is greater than that in the waist region D1 (hereinafter, also simply referred to as "contraction stress"). This makes it possible to achieve both not constricting the abdomen and fixing the diaper 1 so that it does not slip off. The contraction stress in the body circumference region D2 and the lower body circumference region D3 is preferably 1.1 times or more, more preferably 1.3 times or more, that of the contraction stress in the waist region D1, and is preferably 5.0 times or less, more preferably 4.0 times or less, and is preferably 1.1 times or more and 5.0 times or less, more preferably 1.3 times or more and 4.0 times or less. The contraction stress in the body circumference region D2 and the lower body circumference region D3 is preferably 0.1 N / cm or more, more preferably 0.2 N / cm or more, and is preferably 1.0 N / cm or less, more preferably 0.8 N / cm or less, and is preferably 0.1 N / cm or more and 1.0 N / cm or less, more preferably 0.2 N / cm or more and 0.8 N / cm or less. The contraction stress in the waist region D1 is preferably 0.05 N / cm or more, more preferably 0.1 N / cm or more, and is preferably 0.8 N / cm or less, more preferably 0.6 N / cm or less, and is preferably 0.05 N / cm or more and 0.8 N / cm or less, more preferably 0.1 N / cm or more and 0.6 N / cm or less. Note that the contraction stresses in the body circumference region D2 and the lower body circumference region D3 may be different or the same.

[0033] <Method for Measuring Contraction Stress> Measurement method of contraction stress As measurement samples, the above-described waist region D1, body circumference region D2, and lower body circumference region D3 were each cut out annularly from the diaper 1 to obtain a measurement sample D. When cutting out the measurement sample D, the absorbent body was also cut. The measurement sample D has a side seal portion S formed by joining the ventral region and the dorsal region. The width of the measurement sample to be cut out is the same as the width of each region in the diaper 1. As shown in Fig. 6, the measurement sample D is bridged between a pair of U-shaped jigs 100, 100 and fixed between chucks 110, 110 of a tensile testing machine, for example, Autograph (AG-X) manufactured by Shimadzu Corporation. The initial length between the jigs 100, 100 is set to 63.5 mm. Then, the distance between the chucks is increased at a speed of 300 mm / min, and after the length of the measurement sample in the longitudinal direction is extended until it becomes 80% of the length in the maximum elongation state, the distance between the chucks is decreased at a speed of 300 mm / min to contract the measurement sample, and the stress (contraction stress) (unit: N) at that time is measured. Such measurement is performed on 5 measurement samples. Then, the arithmetic mean value of the contraction stress when the length of the measurement sample is contracted until it becomes 70% of the length in the maximum elongation state is obtained, and this arithmetic mean value is converted to a value per unit length (cm) in the width direction of the measurement sample, and this is taken as the contraction stress. Here, the length in the maximum elongation state refers to the distance between the inner edges of the side seal portion S and is the length of the design dimensions of the diaper (in a state where the influence of the elastic member is completely excluded). Also, when the distance between the inner edges of the side seal portion S is different between the ventral side A and the dorsal side B, the arithmetic mean value of the ventral side A and the dorsal side B is used.

[0034] From the viewpoint of more easily satisfying the relationship that the contraction stress of the body circumference region D2 and the lower body circumference region D3 is greater than that of the waist region D1, it is preferable that the fineness of the body circumference elastic member 24d located in the body circumference region D2 and the lower body circumference elastic member 24e located in the lower body circumference region D3 is higher than the fineness of the waist circumference elastic member 24c located in the waist region D1. The fineness of the circumferential elastic member 24d and the lower circumferential elastic member 24e is preferably 310 dtex or more and 1240 dtex or less, more preferably 470 dtex or more and 940 dtex, and still more preferably 470 dtex or more and 780 dtex or less. The fineness of the waist circumferential elastic member 24c is preferably 235 dtex or more and 940 dtex or less, more preferably 310 dtex or more and 780 dtex or less, and still more preferably 310 dtex or more and 620 dtex or less. Incidentally, the fineness of the circumferential elastic member 24d and the lower circumferential elastic member 24e may be different or the same. In each of the regions D1, D2, and D3, when the fineness of the elastic member is different, the maximum fineness in the region is defined as the "fineness of the elastic member" in the region. The fineness of the elastic member can be measured by the following method.

[0035] <Method for Measuring the Fineness of the Elastic Member> The entire absorbent article is immersed in a sufficient amount of tetrahydrofuran (THF) solvent, and after peeling the elastic member from the absorbent article, it is dried in a room at 20°C and 50% humidity for one week to sufficiently dry the elastic member. Measure the natural length L (mm) and weight W (g) of the dried elastic member. The fineness (dtex) of the elastic member is obtained by the following formula. Fineness of elastic member = 10000000 / (L × W)

[0036] As described above, since the circumferential region D2 and the lower circumferential region D3 of the diaper 1 of the present embodiment have a greater contraction stress than the waist region D1, it is preferable that the ratio (%) of the number of the first elastic member arrangement portions 10 to the number of the joints 5 is higher than that of the waist region D1, and it is more preferable that the ratio (%) of the total number of the first elastic member arrangement portion 10 and the second elastic member arrangement portion 11 to the number of the joints 5 is higher. Hereinafter, the ratio (%) of the number of the first elastic member arrangement portions 10 to the number of the joints 5 is also referred to as "the ratio of the first elastic member arrangement portion (%)", and the ratio (%) of the total number of the first elastic member arrangement portion 10 and the second elastic member arrangement portion 11 to the number of the joints 5 is also referred to as "the ratio of the elastic member arrangement portion (%)". By doing so, since the ratios of the first elastic member arrangement portion 10 and the second elastic member arrangement portion 11 in the circumferential region D2 and the lower circumferential region D3 increase, the air permeability in the circumferential region D2 and the lower circumferential region D3 improves, and the vapor generated from the liquid absorbed by the absorber 33 is easily dissipated from the circumferential region D2 and the lower circumferential region D3 to the outside of the diaper 1. As a result, it becomes difficult for the wearer's skin to become swollen due to stuffiness. Therefore, even if the contraction stress in the circumferential region D2 and the lower circumferential region D3 is high, it becomes difficult for the elastic member 24 to leave a mark on the skin. When the number of the first elastic member arrangement portions 10 in the measurement region is a, the number of the second elastic member arrangement portions 11 in the measurement region is b, and the number of the joints 5 in the measurement region is c, the ratio of the first elastic member arrangement portion (%) is defined as a / c × 100, and the ratio of the elastic member arrangement portion (%) is defined as (a + b) / c × 100.

[0037] <Counting method for the number of the first elastic member arrangement portion 10, the second elastic member arrangement portion 11, and the joint 5> Observe the side seal portion S of the diaper 1 using a magnifying glass, and count all the numbers c of the joints 5 in each of the regions D1, D2, and D3. Similarly, count the number a of the first elastic member arrangement portions and the number b of the second elastic member arrangement portions in each region using a magnifying glass.

[0038] From the viewpoint of improving the breathability of the body circumference region D2 and the lower body circumference region D3, the ratio (%) of the first elastic member arrangement portion in the body circumference region D2 and the lower body circumference region D3 is preferably 0.5% or more, more preferably 1% or more, still more preferably 3% or more, and from the viewpoint of ensuring the bonding strength of the side seal portion S, it is preferably 30% or less, more preferably 20% or less, still more preferably 10% or less. Considering the above, the ratio (%) of the first elastic member arrangement portion in the body circumference region D2 and the lower body circumference region D3 is preferably 0.5% or more and 30% or less, more preferably 1% or more and 20% or less, still more preferably 3% or more and 10% or less. From the same viewpoint as above, the ratio (%) of the elastic member arrangement portion in the body circumference region D2 and the lower body circumference region D3 is preferably 1% or more, more preferably 3% or more, still more preferably 5% or more, and preferably 30% or less, more preferably 20% or less, still more preferably 15% or less. Considering the above, the ratio (%) of the elastic member arrangement portion in the body circumference region D2 and the lower body circumference region D3 is preferably 1% or more and 30% or less, more preferably 3% or more and 20% or less, still more preferably 5% or more and 15% or less.

[0039] From the viewpoint of preventing leakage of body fluids such as urine from the side seal portion S, the ratio (%) of the first elastic member arrangement portion in the waist region D1 is preferably 0% or more, and from the viewpoint of ensuring the bonding strength of the side seal portion S, it is preferably 15% or less, more preferably 10% or less, still more preferably 3% or less. Considering the above, the ratio (%) of the first elastic member arrangement portion in the waist region D1 is preferably 0% or more and 15% or less, more preferably 0% or more and 10% or less, still more preferably 0% or more and 3% or less. From the same viewpoint as above, the ratio (%) of the elastic member arrangement portion in the waist region D1 is preferably 0% or more, preferably 20% or less, more preferably 10% or less, still more preferably 5% or less. Considering the above, the ratio (%) of the elastic member arrangement portion in the waist region D1 is preferably 0% or more and 20% or less, more preferably 0% or more and 10% or less, still more preferably 0% or more and 5% or less.

[0040] In the present embodiment, as shown in FIG. 2, in at least one of the ventral part A and the dorsal part B, the longitudinal end 3E of the absorbent body 3 (hereinafter also referred to as the "longitudinal end 3E") is located inward in the longitudinal direction X from the longitudinal end 1E of the diaper 1, and there are an absorber non-arrangement region 3N which is a region sandwiched between the longitudinal end 3E of the absorbent body 3 and the longitudinal end 1E of the diaper 1, and an absorber arrangement region 3M which is adjacent to the absorber non-arrangement region 3N in the longitudinal direction X. The absorber arrangement region 3M is a region where a virtual straight line (not shown) that crosses the ventral part A or the dorsal part B in the lateral direction Y overlaps with the absorbent body 3. In other words, it is a region where a projection image of the absorbent body 3 in the lateral direction Y can be formed in the ventral part A or the dorsal part B. In the present embodiment, the regions other than the absorber non-arrangement region 3N in each of the ventral part A and the dorsal part B are the absorber arrangement regions 3M. Since the absorber arrangement region 3M is a region where vapor generated from body fluids such as urine absorbed and held by the absorber 33 is generated, it is particularly prone to sweating in the worn state of the diaper 1. Therefore, it is a location where skin troubles such as chafing are likely to occur. On the other hand, regarding the first elastic member arrangement portion ratio (%) and the elastic member arrangement portion ratio (%), by establishing the magnitude relationship of "absorber non-arrangement region 3N < absorber arrangement region 3M", the occurrence of such inconveniences is suppressed, and the predetermined effects of the present invention are more surely achieved.

[0041] From the viewpoint of improving the air permeability of the absorber arrangement region 3M, the first elastic member arrangement portion ratio (%) in the absorber arrangement region 3M is preferably 0.5% or more, more preferably 1% or more, still more preferably 3% or more, and from the viewpoint of ensuring the bonding strength of the side seal portion S, it is preferably 20% or less, more preferably 15% or less, still more preferably 10% or less. Considering the above, the first elastic member arrangement portion ratio (%) in the absorber arrangement region 3M is preferably 0.5% or more and 20% or less, more preferably 1% or more and 15% or less, still more preferably 3% or more and 10% or less. From the same perspective as above, the ratio (%) of the elastic member arrangement part in the absorber arrangement region 3M is preferably 1% or more, more preferably 3% or more, still more preferably 5% or more, and preferably 30% or less, more preferably 20% or less, still more preferably 15% or less. Considering the above, the ratio (%) of the elastic member arrangement part in the absorber arrangement region 3M is preferably 1% or more and 30% or less, more preferably 3% or more and 20% or less, still more preferably 5% or more and 15% or less.

[0042] From the perspective of preventing leakage of body fluids such as urine from the side seal part S, the ratio (%) of the first elastic member arrangement part in the non-absorber arrangement region 3N is preferably 0% or more. From the perspective of ensuring the bonding strength of the side seal part S, it is preferably 15% or less, more preferably 10% or less, still more preferably 3% or less. Considering the above, the ratio (%) of the first elastic member arrangement part in the non-absorber arrangement region 3N is preferably 0% or more and 15% or less, more preferably 0% or more and 10% or less, still more preferably 0% or more and 3% or less. From the same perspective as above, the ratio (%) of the elastic member arrangement part in the non-absorber arrangement region 3N is preferably 0% or more, preferably 30% or less, more preferably 20% or less, still more preferably 15% or less. Considering the above, the ratio (%) of the elastic member arrangement part in the non-absorber arrangement region 3N is preferably 0% or more and 30% or less, more preferably 0% or more and 20% or less, still more preferably 0% or more and 15% or less.

[0043] As described above, since the absorber arrangement region 3M is a region where vapor generated from body fluids such as urine absorbed and held by the absorber 33 is generated, it is particularly prone to sweating in the wearing state of the diaper 1. Since the absorber arrangement region 3M includes the body circumference region D2 and the lower body circumference region D3, from the perspective of more surely achieving the predetermined effect of the present invention, it is also preferable that the ratio of the first elastic member arrangement part and the ratio (%) of the elastic member arrangement part in each of the regions D1, D2, D3 satisfy the following magnitude relationship. Body circumference region ≥ Lower body circumference region > Waist region

[0044] From the viewpoints of ensuring the strength of the side seal portion S, improving the breathability of the diaper 1, and reducing the traces around the wearer's waist by the elastic member 24, the first elastic member arrangement portion ratios (%) of the waist region D1, the body circumference region D2, and the lower body circumference region D3 are preferably within the following ranges. The first elastic member arrangement portion ratio (%) of the waist region D1 is preferably 0% or more and 10% or less, more preferably 0% or more and 5% or less. The first elastic member arrangement portion ratio (%) of the body circumference region D2 is preferably 0.5% or more and 30% or less, more preferably 1% or more and 20% or less, still more preferably 3% or more and 15% or less. The first elastic member arrangement portion ratio (%) of the lower body circumference region D3 is preferably 0.5% or more and 30% or less, more preferably 1% or more and 15% or less.

[0045] From the same viewpoints as above, the elastic member arrangement portion ratios (%) of the waist region D1, the body circumference region D2, and the lower body circumference region D3 are preferably within the following ranges. The elastic member arrangement portion ratio (%) of the waist region D1 is preferably 0% or more and 15% or less, more preferably 0% or more and 10% or less. The elastic member arrangement portion ratio (%) of the body circumference region D2 is preferably 3% or more and 30% or less, more preferably 5% or more and 20% or less. The elastic member arrangement portion ratio (%) of the lower body circumference region D3 is preferably 2% or more and 30% or less, more preferably 4% or more and 20% or less.

[0046] In the diaper 1 of the present embodiment, in the longitudinal direction X (one direction), it is preferable that there is no location where the first elastic member arrangement portions 10 are adjacent to each other, no location where the second elastic member arrangement portions 11 are adjacent to each other, and no location where the first elastic member arrangement portion 10 and the second elastic member arrangement portion 11 are adjacent to each other. That is, it is preferable that the adjacent elastic members 24 are not the first elastic members 24a to each other, not the second elastic members 24b to each other, or not the first elastic members 24a and the second elastic members 24b. With such a configuration, the strength of the side seal portion S can be ensured.

[0047] It is preferable that the ventral part A and the dorsal part B are basically configured in the same manner. In particular, it is preferable that the first elastic member arrangement part is formed at a position that is line-symmetric with respect to the horizontal center line CLx of the diaper 1 as the axis of symmetry, and it is also preferable that the first elastic member arrangement part 10 and the second elastic member arrangement part 11 are formed at positions that are line-symmetric with respect to the horizontal center line CLx of the diaper 1 as the axis of symmetry. With such a configuration, when the diaper 1 is worn, the first elastic member arrangement part 10 and the second elastic member arrangement part 11 are in the same position, so that the air permeability of the diaper 1 can be further improved, and the predetermined effect of the present invention can be more surely achieved.

[0048] The material for forming the diaper 1 will be described. As the outer layer sheet 22 and the inner layer sheet 23, various sheet materials conventionally used for absorbent articles such as disposable diapers can be used without particular limitation. For example, it is preferable to use a non-woven fabric, and the constituent fibers of the non-woven fabric are not limited to the fibers of a single resin, and composite fibers such as core-sheath type composite fibers and side-by-side type composite fibers can also be used. Further, as the non-woven fabric, a single-layer non-woven fabric such as an air-through non-woven fabric, a heat-rolled non-woven fabric, a spunlace non-woven fabric, a spunbond non-woven fabric, a meltblown non-woven fabric, or a laminated non-woven fabric in which two or more of these are laminated can also be used. Further, as the outer layer sheet 22 and the inner layer sheet 23, a sheet in which a non-woven fabric and a film are integrated can also be used.

[0049] As the top sheet 31, the back sheet 32, the absorber 33, and the sheet 36 for forming the leak - proof cuff, those conventionally used in absorbent articles such as disposable diapers can be used without particular limitation. For example, as the top sheet 31, a liquid - permeable non - woven fabric, a perforated film, a laminate thereof, etc. can be used. As the back sheet 32, a resin film, a laminate of a resin film and a non - woven fabric, etc. can be used. As the absorber 33, an absorbent core composed of a fiber aggregate of a fiber material such as pulp or an absorbent core having a superabsorbent polymer supported thereon, which is wrapped with a core wrap sheet made of tissue paper, a water - permeable non - woven fabric, etc. can be used. As the sheet 36 for forming the leak - proof cuff, a stretchable film, a water - repellent non - woven fabric, a woven fabric, or a laminated sheet thereof, etc. can be used.

[0050] As materials for various elastic members in the diaper 1 including the elastic members 24 and 35, various known elastic materials usually used in this type of absorbent article can be used without particular limitation unless otherwise specified. For example, synthetic rubbers such as styrene - butadiene, butadiene, isoprene, neoprene, natural rubber, EVA, stretchable polyolefin, polyurethane, etc. can be mentioned. As the form of the elastic member, a filamentous (such as thread rubber) or cord - like (such as flat rubber) one with a rectangular, square, circular, polygonal cross - section, or a filamentous multi - filament type can be preferably used.

[0051] The diaper 1 of the present embodiment is not particularly limited in its manufacturing method and can be manufactured by any method. Hereinafter, a preferred example of the manufacturing method of the diaper 1 of the present embodiment will be described with reference to FIG. 7.

[0052] In the manufacturing method of this embodiment, as shown in FIG. 7, a wide strip-shaped sheet 122 which is a stock of the outer layer sheet and a wide strip-shaped sheet 123 which is a stock of the inner layer sheet are overlapped with an elastic member 24 interposed therebetween in an extended state. Before overlapping the two strip-shaped sheets 122 and 123, a plurality of elastic members 24 are passed through the grooves of a comb gun for applying an adhesive, and the adhesive is applied to the elastic members 24 (not shown), and the elastic members 24 are fixed between the strip-shaped sheets 122 and 123 by pressurization with nip rolls 90.

[0053] Next, the two overlapped strip-shaped sheets 122 and 123 are introduced between pressure rolls 92 and 92 formed with convex portions for cutting the elastic member 24 and are partially pressurized, thereby cutting the elastic member 24 at the site where the absorbent body 3 is disposed. Next, the two strip-shaped sheets 122 and 123 laminated with the elastic member 24 interposed therebetween are divided into two strip-shaped sheets 102A and 102B by a dividing means 93. The two strip-shaped sheets 102A and 102B produced by the division are used as a ventral side outer package body continuum 102A and a dorsal side outer package body continuum 102B. The ventral side outer package body continuum 102A generally has a configuration in which ventral side sheet members 2A of a plurality of diapers 1 are continuous, and the dorsal side outer package body continuum 102B generally has a configuration in which ventral side sheet members 2A of a plurality of diapers 1 are continuous. As the dividing means, various known cutting devices capable of continuously cutting a sheet can be used. For example, those provided with a cutter blade on the upstream side in the flow direction of the sheet, a cylindrical or disc-shaped cutter having an annular blade on the peripheral surface or the peripheral edge portion, a laser cutter, a high-pressure water jet cutter, etc. can be used. The method of dividing by the dividing means has advantages such as being able to shorten the axial length dimension of the pressure roll 92 or the like.

[0054] Next, while continuously conveying the ventral outer body continuum 102A and the dorsal outer body continuum 102B with a predetermined interval therebetween, the absorbent body 3 is fixed to the ventral outer body continuum 102A and the dorsal outer body continuum 102B so as to be bridged therebetween. In order to fix the absorbent body 3, an adhesive is applied to the surface on the backsheet side of the absorbent body 3 and / or the opposing surfaces of the two continua 102A, 102B. Further, in the present embodiment, one side portions 102A', 102B' along the flow direction of each of the ventral outer body continuum 102A and the dorsal outer body continuum 102B are folded back so as to cover both end portions of the absorbent body 3, and the folded-back portions are fixed to the both end portions.

[0055] Then, the diaper continuum 101 thus obtained is folded in half, and then the side seal portions S, S are formed by heat sealing, ultrasonic sealing, high-frequency sealing, or a combination of these means. For forming the side seal portions S, S, a sealing device (not shown) provided with a pair of seal rolls is preferably used. Further, the folding in half of the diaper continuum 101 is performed such that the edge portions 101' generated by the folding back of the side portion 102A' of the ventral outer body continuum 102A and the folding back of the side portion 102B' of the dorsal outer body continuum 102B overlap each other. Then, after forming the side seal portions S, S, the diaper continuum 101 is cut into the dimensions of individual diapers 1 by a known cutting means (not shown). Thereby, the pant-type disposable diaper 1 having the above-described configuration is obtained.

[0056] Regarding the manufacturing method of the present embodiment, points not particularly described can be manufactured in the same manner as in the conventional manufacturing method of so-called cross-flow type pant-type disposable diapers. For example, the absorbent body 3 disposed on the ventral outer body continuum 102A and the dorsal outer body continuum 102B can be obtained by manufacturing an absorbent body continuum 103 having a configuration in which the absorbent body is continuous in the longitudinal direction by a known method and then cutting this into dimensions for one diaper. Further, the obtained absorbent bodies 3 can be intermittently disposed on the ventral outer body continuum 102A and the dorsal outer body continuum 102B after being rotated 90 degrees each.

[0057] In addition, in the method for manufacturing the diaper 1 shown in FIG. 7, after overlapping the wide strip-shaped sheet 122 which is the stock of the outer layer sheet and the wide strip-shaped sheet 123 which is the stock of the inner layer sheet, they were divided by the dividing means 93 to obtain the ventral side outer body continuum 102A and the dorsal side outer body continuum 102B. Instead, the outer layer sheet and the inner layer sheet for the ventral side sheet member 2A and the outer layer sheet and the inner layer sheet for the dorsal side sheet member 2B may be separately supplied to the joining portion to obtain the ventral side outer body continuum 102A and the dorsal side outer body continuum 102B.

[0058] Moreover, regarding the various preferable dimensions, ratios, etc. related to the above-described embodiment, it is sufficient if either one of the ventral side portion A side and the dorsal side portion B side satisfies them, and it is preferable that both the ventral side portion A side and the dorsal side portion B side satisfy them. However, regarding the fineness and the shrinkage stress of the elastic member, it is preferable that both the ventral side portion A side and the dorsal side portion B side satisfy the above-described preferable range.

[0059] Regarding the above-described embodiment, the present invention further discloses the following diapers. <1> A pant-type absorbent article comprising an outer body and an absorbent body fixed to the outer body, having a longitudinal direction along the front-back direction of the wearer and a lateral direction orthogonal to the longitudinal direction, wherein the outer body includes a ventral side portion disposed on the ventral side of the wearer and a dorsal side portion disposed on the dorsal side of the wearer, and both end portions of the ventral side portion and both end portions of the dorsal side portion are joined to form a pair of side seal portions, a waist opening portion, and a pair of leg opening portions, the outer body includes an outer layer sheet disposed on the side farther from the wearer's body, an inner layer sheet located on the side closer to the wearer's body, and a plurality of elastic members disposed in an extended state along the lateral direction between these two sheets, the joined portion where the ventral side portion and the dorsal side portion are heat-sealed has a belt-shaped seal portion formed intermittently in a plurality along one direction, the belt-shaped seal portion has a first elastic member arrangement portion where the elastic member is disposed between two adjacent joined portions in the one direction, In the first elastic member arrangement portion, the joint portion overlapping the elastic member is not formed, and the distance between two adjacent joint portions in the one direction is wider than the standard distance of the joint portions formed in the belt-like seal portion. A pant-type absorbent article.

[0060] <2> The belt-like seal portion further has a second elastic member arrangement portion. In the second elastic member arrangement portion, the elastic member is arranged between two adjacent joint portions in the one direction, and has a small joint portion whose length in the direction orthogonal to the one direction is shorter than that of the two adjacent joint portions. The pant-type absorbent article according to <1>. <3> The elastic member arranged in the second elastic member arrangement portion has a portion overlapping the small joint portion. The pant-type absorbent article according to <2>. <4> The area of the joint portion is 0.5 mm 2 or more and 5.0 mm 2 or less. The pant-type absorbent article according to any one of <1> to <3>. <5> The area of the small joint portion is 0.1 mm 2 or more and 1.1 mm 2 or less. The pant-type absorbent article according to any one of <2> to <4>. <6> The area of the small joint portion is 10% or more and 90% or less compared to the area of the joint portion. The pant-type absorbent article according to any one of <2> to <5>.

[0061] <7> One or both of the pair of side seal portions are the belt-like seal portion. The pant-type absorbent article according to any one of <1> to <6>. <8> The longitudinal distance of the first elastic member arrangement portion is 110% or more and 500% or less with respect to the standard distance of the joint portion. The pant-type absorbent article according to <7>. <9> The vertical distance of the second elastic member arrangement part is 110% or more and 600% or less with respect to the standard interval of the joint part, the pants-type absorbent article according to <7> or <8> above. <10> The ventral part and the dorsal part have a waist region that forms the peripheral edge of the waist opening, a body circumference region that is located inward in the vertical direction from the waist region, and a lower body circumference region that is located inward in the vertical direction from the body circumference region. The body circumference region and the lower body circumference region have a greater lateral contraction stress of the elastic member than the waist region, and a higher ratio of the number of the first elastic member arrangement parts to the number of the joint parts than the waist region, the pants-type absorbent article according to <1> above. <11> The ventral part and the dorsal part have a waist region that forms the peripheral edge of the waist opening, a body circumference region that is located inward in the vertical direction from the waist region, and a lower body circumference region that is located inward in the vertical direction from the body circumference region. The body circumference region and the lower body circumference region have a greater lateral contraction stress of the elastic member than the waist region, and a higher ratio of the total number of the first elastic member arrangement parts and the second elastic member arrangement parts to the number of the joint parts than the waist region, the pants-type absorbent article according to any one of <2> to <10> above.

[0062] <12> The ratio of the total number of the first elastic member arrangement parts and the second elastic member arrangement parts to the number of the joint parts in the body circumference region and the lower body circumference region is 1% or more and 30% or less, the pants-type absorbent article according to <11> above. <13> The ratio of the total number of the first elastic member arrangement parts and the second elastic member arrangement parts to the number of the joint parts in the waist region is 0% or more and 20% or less, the pants-type absorbent article according to <12> or <12> above. <14> The contraction stress of the circumferential region and the lower circumferential region is 1.1 times or more and 5.0 times or less the contraction stress of the waist region, the pant-type absorbent article according to any one of <10> to <13>. <15> The ventral part and the dorsal part have a waist region that forms a peripheral edge of the waist opening, a circumferential region located inward in the longitudinal direction from the waist region, and a lower circumferential region located inward in the longitudinal direction from the circumferential region. The fineness of the elastic member disposed in the circumferential region and the lower circumferential region is higher than the fineness of the elastic member disposed in the waist region. The circumferential region and the lower circumferential region have a higher ratio of the number of the first elastic member arrangement portions to the number of the joints than the waist region, the pant-type absorbent article according to <1>. <16> The ventral part and the dorsal part have a waist region that forms a peripheral edge of the waist opening, a circumferential region located inward in the longitudinal direction from the waist region, and a lower circumferential region located inward in the longitudinal direction from the circumferential region. The fineness of the elastic member disposed in the circumferential region and the lower circumferential region is higher than the fineness of the elastic member disposed in the waist region. The circumferential region and the lower circumferential region have a higher ratio of the total number of the first elastic member arrangement portion and the second elastic member arrangement portion to the number of the joints than the waist region, the pant-type absorbent article according to any one of <2> to <15>.

[0063] <17> In at least one of the ventral part and the dorsal part, the longitudinal end of the absorbent body is located inward in the longitudinal direction from the longitudinal end of the pant-type absorbent article, and a region sandwiched between the end of the absorbent body and the end of the pant-type absorbent article is a non-absorbent body arrangement region. In the pant-type absorbent article according to <1> above, in the absorber non-disposed region and the absorber disposed region adjacent thereto in the longitudinal direction, the ratio of the number of the first elastic member disposed portions to the number of the joints is higher than that in the absorber non-disposed region. <18> In at least one of the ventral side portion and the dorsal side portion, the longitudinal end of the absorbent main body is located inward in the longitudinal direction than the longitudinal end of the pant-type absorbent article, and the region sandwiched between the end of the absorbent main body and the end of the pant-type absorbent article is an absorber non-disposed region. In the pant-type absorbent article according to any one of <2> to <17> above, in the absorber non-disposed region and the absorber disposed region adjacent thereto in the longitudinal direction, the ratio of the total number of the first elastic member disposed portions and the second elastic member disposed portions to the number of the joints is higher than that in the absorber non-disposed region. <19> In the pant-type absorbent article according to <18> above, in the absorber disposed region, the ratio of the total number of the first elastic member disposed portions and the second elastic member disposed portions to the number of the joints is 1% or more and 30% or less. <20> In the pant-type absorbent article according to <18> or <19> above, in the absorber non-disposed region, the ratio of the total number of the first elastic member disposed portions and the second elastic member disposed portions to the number of the joints is 0% or more and 30% or less. <21> In the pant-type absorbent article according to any one of <2> to <20> above, in the one direction, there is no location where the first elastic member disposed portions are adjacent to each other, no location where the second elastic member disposed portions are adjacent to each other, and no location where the first elastic member disposed portion and the second elastic member disposed portion are adjacent to each other.

[0064] <22> In the pant-type absorbent article according to any one of <2> to <21> above, the first elastic member disposed portion and the second elastic member disposed portion are formed to be line-symmetric with respect to the horizontal center line extending along the lateral direction and bisecting the longitudinal direction as the axis of symmetry. <23> The pant-type absorbent article according to <1>, wherein the first elastic member disposing portion is formed to be line-symmetric with a horizontal center line that extends along the lateral direction and bisects the longitudinal direction as a symmetry axis. <24> The ventral part and the dorsal part each have a waist region that forms a peripheral edge of the waist opening, a body circumference region that is located inward in the longitudinal direction from the waist region, and a lower body circumference region that is located inward in the longitudinal direction from the body circumference region. With respect to the total longitudinal length of the side seal portion, the longitudinal length of the waist region is 25%, the longitudinal length of the body circumference region is 40%, and the longitudinal length of the lower body circumference region is 35%. The pant-type absorbent article according to <1>, wherein the ratio of the number of the first elastic member disposing portions to the number of the joining portions in each region satisfies the following magnitude relationship. Body circumference region ≧ Lower body circumference region > Waist region <25> The pant-type absorbent article according to <24>, wherein the ratio of the number of the first elastic member disposing portions to the number of the joining portions in the body circumference region is 0.5% or more and 30% or less. <26> The ventral part and the dorsal part each have a waist region that forms a peripheral edge of the waist opening, a body circumference region that is located inward in the longitudinal direction from the waist region, and a lower body circumference region that is located inward in the longitudinal direction from the body circumference region. With respect to the total longitudinal length of the side seal portion, the longitudinal length of the waist region is 25%, the longitudinal length of the body circumference region is 40%, and the longitudinal length of the lower body circumference region is 35%. The pant-type absorbent article according to any one of <2> to <25>, wherein the ratio of the total number of the first elastic member disposing portions and the second elastic member disposing portions to the number of the joining portions in each region satisfies the following magnitude relationship. Body circumference region ≧ Lower body circumference region > Waist region

[0065] <27> In the panty-type absorbent article according to <26> above, in the waist region, the ratio of the total number of the first elastic member disposition portions and the second elastic member disposition portions to the number of the joining portions is 3% or more and 30% or less. <28> In the panty-type absorbent article according to <26> or <27> above, in the waist region, the ratio of the total number of the first elastic member disposition portions and the second elastic member disposition portions to the number of the joining portions is 0% or more and 15% or less. <29> In the panty-type absorbent article according to any one of <26> to <28> above, in the lower abdominal region, the ratio of the total number of the first elastic member disposition portions and the second elastic member disposition portions to the number of the joining portions is 2% or more and 30% or less.

Explanation of Signs

[0066] 1 Diaper 2 Outer body 2A Ventral sheet member 2B Dorsal sheet member 3 Absorbent main body 3M Absorbent body disposition region 3N Non-absorbent body disposition region 5’ Non-joining portion 5 Joining portion 6 Small joining portion 10 First elastic member disposition portion 11 Second elastic member disposition portion 22 Outer layer sheet 23 Inner layer sheet 24 Elastic member 24a First elastic member 24b Second elastic member 27 Band-shaped seal portion 31 Surface sheet 32 Back surface sheet 33 Absorbent body 34 Leakage-preventing cuff 35 Leakage-preventing cuff elastic member

Claims

1. It comprises an outer package and an absorbent body fixed to the outer package, and has a longitudinal direction along the front-back direction of the wearer and a transverse direction orthogonal to the longitudinal direction. The outer package includes a ventral side portion arranged on the ventral side of the wearer and a dorsal side portion arranged on the dorsal side of the wearer, and both ends of the ventral side portion and both ends of the dorsal side portion are joined to form a pair of side seal portions, a waist opening, and a pair of leg openings. It is a pant-type absorbent article. The outer package includes an outer layer sheet arranged on the side far from the wearer's body, an inner layer sheet located on the side close to the wearer's body, and a plurality of elastic members arranged in an extended state along the transverse direction between these two sheets. The joined portion where the ventral side portion and the dorsal side portion are heat-sealed has a strip-shaped seal portion formed intermittently along one direction. The strip-shaped seal portion has a first elastic member arrangement portion where the elastic member is arranged between two adjacent joined portions in the one direction. In the first elastic member arrangement portion, no joined portion overlapping the elastic member is formed, and the interval between two adjacent joined portions in the one direction is wider than the standard interval of the joined portions formed in the strip-shaped seal portion. It is a pant-type absorbent article.

2. The strip-shaped seal portion further has a second elastic member arrangement portion. The second elastic member arrangement portion has a small joined portion where the elastic member is arranged between two adjacent joined portions in the one direction and the length in the direction orthogonal to the one direction is shorter than that of the two adjacent joined portions. The pant-type absorbent article according to Claim 1.

3. The elastic member arranged in the second elastic member arrangement portion has a portion overlapping the small joined portion. The pant-type absorbent article according to Claim 2.

4. One or both of the pair of side seal portions are the strip-shaped seal portion. The pant-type absorbent article according to any one of Claims 1 to 3.

5. The ventral side portion and the dorsal side portion have a waist region forming the peripheral edge of the waist opening, a body circumference region located inward in the longitudinal direction from the waist region, and a lower body circumference region located inward in the longitudinal direction from the body circumference region. The circumferential region around the body and the lower circumferential region around the body have a greater lateral contraction stress of the elastic member than the waist region, and a higher ratio of the number of the first elastic member arrangement portions to the number of the joints than the waist region. The pants-type absorbent article according to claim 1.

6. The ventral side portion and the dorsal side portion have a waist region forming a peripheral edge of the waist opening, a circumferential region around the body located inward in the longitudinal direction from the waist region, and a lower circumferential region around the body located inward in the longitudinal direction from the circumferential region around the body. The circumferential region around the body and the lower circumferential region around the body have a greater lateral contraction stress of the elastic member than the waist region, and a higher ratio of the total number of the first elastic member arrangement portions and the second elastic member arrangement portions to the number of the joints than the waist region. The pants-type absorbent article according to claim 2.

7. The ventral side portion and the dorsal side portion have a waist region forming a peripheral edge of the waist opening, a circumferential region around the body located inward in the longitudinal direction from the waist region, and a lower circumferential region around the body located inward in the longitudinal direction from the circumferential region around the body. The fineness of the elastic member arranged in the circumferential region around the body and the lower circumferential region around the body is higher than the fineness of the elastic member arranged in the waist region. The circumferential region around the body and the lower circumferential region around the body have a higher ratio of the number of the first elastic member arrangement portions to the number of the joints than the waist region. The pants-type absorbent article according to claim 1.

8. The ventral side portion and the dorsal side portion have a waist region forming a peripheral edge of the waist opening, a circumferential region around the body located inward in the longitudinal direction from the waist region, and a lower circumferential region around the body located inward in the longitudinal direction from the circumferential region around the body. The fineness of the elastic member arranged in the circumferential region around the body and the lower circumferential region around the body is higher than the fineness of the elastic member arranged in the waist region. The circumferential region around the body and the lower circumferential region around the body have a higher ratio of the total number of the first elastic member arrangement portions and the second elastic member arrangement portions to the number of the joints than the waist region. The pants-type absorbent article according to claim 2.

9. In at least one of the ventral part and the dorsal part, the longitudinal end of the absorbent body is located more inward in the longitudinal direction than the longitudinal end of the pant-type absorbent article, and the region sandwiched between the end of the absorbent body and the end of the pant-type absorbent article is a non-absorbent body region. The pant-type absorbent article according to claim 1, wherein, in the longitudinal direction, the absorbent body arrangement region adjacent to the non-absorbent body region has a higher ratio of the number of the first elastic member arrangement portions to the number of the joints than the non-absorbent body region.

10. In at least one of the ventral part and the dorsal part, the longitudinal end of the absorbent body is located more inward in the longitudinal direction than the longitudinal end of the pant-type absorbent article, and the region sandwiched between the end of the absorbent body and the end of the pant-type absorbent article is a non-absorbent body region. The pant-type absorbent article according to claim 2, wherein, in the longitudinal direction, the absorbent body arrangement region adjacent to the non-absorbent body region has a higher ratio of the total number of the first elastic member arrangement portions and the second elastic member arrangement portions to the number of the joints than the non-absorbent body region.

11. The pant-type absorbent article according to claim 2, wherein there is no location where the first elastic member arrangement portions are adjacent to each other, no location where the second elastic member arrangement portions are adjacent to each other, and no location where the first elastic member arrangement portion and the second elastic member arrangement portion are adjacent to each other in the one direction.

12. The pant-type absorbent article according to claim 2, wherein the first elastic member arrangement portion and the second elastic member arrangement portion are formed to be line-symmetric with a horizontal center line that extends along the lateral direction and bisects the longitudinal direction as a symmetry axis.

13. The pant-type absorbent article according to claim 1, wherein the first elastic member arrangement portion is formed to be line-symmetric with a horizontal center line that extends along the lateral direction and bisects the longitudinal direction as a symmetry axis.

14. The ventral part and the dorsal part have a waist region that forms a peripheral edge of the waist opening, a body circumference region that is located more inward in the longitudinal direction than the waist region, and a lower body circumference region that is located more inward in the longitudinal direction than the body circumference region. With respect to the total longitudinal length of the side seal portion, the longitudinal length of the waist region is 25%, the longitudinal length of the body circumference region is 40%, and the longitudinal length of the lower body circumference region is 35%. The pants-type absorbent article according to claim 1, wherein the ratio of the number of the first elastic member arrangement portions to the number of the joints in each region satisfies the following magnitude relationship. Waist circumference region < Lower waist circumference region ≤ Torso circumference region

15. The pants-type absorbent article according to claim 14, wherein in the torso circumference region, the ratio of the number of the first elastic member arrangement portions to the number of the joints is 0.5% or more and 30% or less.

16. The ventral side portion and the dorsal side portion have a waist region that forms a peripheral edge of the waist opening, a torso circumference region that is located inward in the longitudinal direction from the waist region, and a lower torso circumference region that is located inward in the longitudinal direction from the torso circumference region. With respect to the total longitudinal length of the side seal portion, the longitudinal length of the waist region is 25%, the longitudinal length of the torso circumference region is 40%, and the longitudinal length of the lower torso circumference region is 35%. The pants-type absorbent article according to claim 2, wherein the ratio of the total number of the first elastic member arrangement portions and the second elastic member arrangement portions to the number of the joints in each region satisfies the following magnitude relationship. Waist circumference region < Lower waist circumference region ≤ Torso circumference region

17. The pants-type absorbent article according to claim 16, wherein in the torso circumference region, the ratio of the total number of the first elastic member arrangement portions and the second elastic member arrangement portions to the number of the joints is 3% or more and 30% or less.

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