TW201803534A - Underpants-style absorbent article - Google Patents

Abstract

An underpants-style absorbent article (1) has a longitudinal direction corresponding to the front-back direction of the wearer and a transverse direction that orthogonally crosses the longitudinal direction, and is provided with: an absorbent main body (10) that includes an absorbing body and that has a tridimensional gather disposed on both side sections of the longitudinal direction; and an exterior member (11) disposed on the non-skin-facing side of the absorbent main body. A pair of side sealed sections (S, S), a waist opening (5), and a pair of leg openings (6, 6) are formed by bonding both side sections of an abdominal-side section located on the abdominal side of the wearer to both side sections of a backside section located on the back side of the wearer. In a natural flat state, an angle ([theta]) formed between a first hypothetical straight line (L1), which connects a lower edge (Sd) of the side sealed section and a leading end (8a) of the tridimensional gather, and a second hypothetical straight line (L2), which passes through the leading end (8a) of the tridimensional gather and extends in the traverse direction, is 40-60 DEG. The tridimensional gather (8) is disposed in such a way that the leading end (8a) thereof is located closer to the center in the traverse direction of the underpants-style absorbent article than a rising base end (8b) of the tridimensional gather.

Description

Pants-type absorbent article

The present invention relates to a pant-type absorbent article such as a disposable diaper.

As pants-type absorbent articles, there are known pants-type disposable diapers which include an absorbent body having an absorbent body and a non-skin-facing surface side of the absorbent body to fix the absorbent body. The material is joined to both sides of the ventral portion disposed on the ventral side of the wearer and both sides of the back side portion disposed on the back of the wearer to form a pair of side seal portions and waist openings when worn. And a pair of leg openings. Regarding adult diapers in this pant type diaper or training diapers for detaching diapers for young children, in the case of adults, in terms of improving the quality of life (QOL), In this case, from the viewpoint of easily transitioning to normal panties, it is preferable to be able to pull up with both feet after passing through the leg openings, and to wear them while standing. However, if the conventional pants-type absorbent article allows the feet to pass through the leg openings while standing, it is necessary to tilt the body significantly, or the feet may catch near the entrance of the leg openings, so it may not be easy to wear. . In Patent Document 1, as a diaper that can be worn on its own while standing, it is described that the waist-periphery portion and the hips arranged around the waist and abdomen of the wearer can be used by either the ventral side or the back side of the wearer. Removably connected between the sections. [Prior Art Document] [Patent Document] [Patent Document 1] Japanese Patent Laid-Open No. 2008-036019

The present invention is a pants-type absorbent article including an absorbent body and an exterior material, the absorbent body having a longitudinal direction corresponding to the front and back directions of the wearer and a transverse direction orthogonal to the longitudinal direction, including an absorbent body, There are three-dimensional folds on both sides in the longitudinal direction, and the exterior material is arranged on the non-skin facing side of the absorbent body; the pants-type absorbent article has a ventral side disposed on the ventral side of the wearer when worn The back portion, the back portion disposed on the back side of the wearer, and the lower portion located therebetween. A pair of side seal portions and a waist portion are formed by joining both sides of the ventral portion and both sides of the back portion. An opening and a pair of leg openings. The three-dimensional fold has a first imaginary straight line extending through a front end and a standing base end respectively extending in the longitudinal direction of the absorbent body, and connecting the lower end of the side seal portion with the front end of the three-dimensional fold in a naturally flat state. The angle θ formed by the second imaginary straight line passing through the front end of the three-dimensional pleats and extending in the lateral direction of the pants-type absorbent article is 40 ° or more and 60 ° or less. The front end of the three-dimensional pleats is closer to the center of the lateral direction of the pants-type absorbent article than the standing base end of the three-dimensional pleats.

The diaper described in Patent Document 1 requires an operation to connect the waist-peripheral portion and the intercondylar portion, and the operation of wearing consumes labor and time. The present invention relates to a pants-type absorbent article which can eliminate the disadvantages of the aforementioned prior art. Hereinafter, the present invention will be described with reference to the drawings based on its preferred embodiment. As shown in FIG. 1, the pants type disposable diaper 1 (henceforth a diaper 1) which is one Embodiment of this invention is a pants type disposable diaper for adults. The diaper 1 includes an absorbent body 10 having a longitudinal direction X corresponding to the front-back direction of the wearer and a transverse direction Y orthogonal to the longitudinal direction X. As shown in FIG. 2 and FIG. There are three-dimensional folds 8 on both sides of the longitudinal direction X; and an exterior material 11 is located on the non-skin facing surface side of the absorbent body 10 to fix the absorbent body 10. As shown in FIG. 2, the diaper 1 has a ventral portion A disposed on the ventral side of the wearer, a dorsal portion B disposed on the dorsal side, and a lower crotch portion C positioned therebetween when worn. The exterior material 11 forms the outer surface of the diaper 1 and has a shape in which the central portion in the longitudinal direction becomes thinner in a state where it is expanded and expanded (see FIG. 2). The exterior material 11 joins the two side portions A1 and A1 of the abdominal portion A and the two side portions B1 and B1 of the back portion B to each other to form a pair of side seal portions S and S and a waist opening portion in the diaper 1. 5 and a pair of leg openings 6, 6. In pants-type absorbent articles such as diapers 1, the longitudinal direction X is a direction from the ventral portion A through the lower crotch C to the dorsal portion B, and the lateral direction Y is a direction orthogonal to the longitudinal direction X. The absorbent body 10 and the absorbent body 4 of the diaper 1 each have a longitudinal shape that is longer in the same direction as the longitudinal direction X of the diaper 1. In addition, the diaper 1 has a shape which is bilaterally symmetrical with respect to the longitudinal center line CL extending in the longitudinal direction X. Therefore, although the description of the left-right symmetrical part is sometimes described using the right side as an example, the same applies to the left side as an example. The absorbent body 10 includes a liquid-permeable front sheet 2, a liquid-impermeable back sheet 3, and a liquid-retaining absorber 4 interposed between the two sheets 2 and 3. Liquid impermeability also includes water repellency or liquid impermeability. As the front sheet 2, the back sheet 3, and the absorber 4, various materials previously used in this kind of article can be used without particular limitation, respectively. For example, as the front sheet 2, various non-woven fabrics or perforated films can be used, and as the back sheet 3, a resin film or a laminate of a resin film and a non-woven fabric can be used. The back sheet 3 may or may not have moisture permeability. As the absorbent body 4, a structure such as an absorbent core containing aggregates of absorbent fibers such as pulp fibers or a non-woven fabric or a toilet paper with an absorbent core formed by retaining a highly absorbent polymer therein can be used. Covered with core packing sheet. The absorbent body 10 has a three-dimensional fold 8, and one side edge portion side of the three-dimensional fold 8 is fixed to a constituent member of the absorbent body 10, and the fixed end can be used as a standing base end 8b and the other side edge portion can be used as The front end 8a stands up. As shown in FIGS. 2 and 3, three-dimensional folds 8 are formed on both sides in the longitudinal direction of the absorbent body 10 and are formed along the longitudinal direction X, respectively. The three-dimensional wrinkle 8 includes a three-dimensional wrinkle-forming sheet 81 and an elastic member 82 fixed to the sheet 81 in an extended state. The three-dimensional wrinkle-forming sheet 81 has a fixed domain 81b and a free domain 81a, which is fixed to the lower part of the chin C and fixed to the constituent members of the absorbent body 10 such as the front sheet 2 or the back sheet 3, and the free domain 81a is a component that is not fixed to the absorbent body 10, and the free domain 81a and the elastic member 82 fixed to the free domain 81a in an extended state form a three-dimensional fold 8. The three-dimensional fold 8 has a front end 8 a and a raised base end 8 b, and the front end 8 a and the raised base end 8 b extend in the longitudinal direction of the absorbent body 10, respectively. In the three-dimensional wrinkle forming sheet 81, the boundary between the fixed domain 81b and the free domain 81a becomes the raised base end 8b of the three-dimensional wrinkle 8, and the end of the three-dimensional wrinkle 8 in the lateral direction is opposite to the raised base end 8b. The portion becomes the front end 8a of the three-dimensional fold 8 so that the free domain 81a can stand up. In the three-dimensional wrinkle-forming sheet 81 of the present embodiment, the portion of the three-dimensional wrinkle-forming sheet 8 that is further outside the lateral direction Y from the skin-facing side of the absorbent body 4 toward the non-skin-facing side Scroll down. The three-dimensional wrinkle-forming sheet 81 has a portion joined to at least one of the back sheet 3 and the exterior material 11 on the non-skin facing surface side of the absorbent body 4 and fixed to the skin facing surface side of the absorbent body 4. The part on the front sheet 2 forms a three-dimensional fold 8 on the lower part of the crotch, the ventral part A, and the back part B to form a three-dimensional fold 8 which is a part of the above-mentioned free domain 81a away from the front sheet 2. On the other hand, at both ends in the longitudinal direction of the absorptive body 10 located on the ventral portion A and the dorsal portion B, the 8e portions of the three-dimensional wrinkle-forming sheet 81 are also laid on the front sheet 2 and joined to the front. The sheet 2 is located closer to the center of the absorbent body 10 in the lateral direction than the portion located on the extension line of the raised base end 8 b of the three-dimensional fold 8. The exterior material 11 of each of the ventral portion A and the back portion B has a structure in which outer sheets 12A, 12B and inner sheets 13A, 13B are laminated, and the outer sheets 12A and 12B include a stretchable sheet, The inner layer sheets 13A and 13B are closer to the skin facing surface side than the outer layer sheets 12A and 12B and include a non-stretchable sheet. On the other hand, the outer casing 11 of the lower part C has a structure in which an outer layer sheet 12C and an inner layer sheet 13C are laminated. The outer layer sheet 12C includes a non-stretchable sheet, and the inner layer sheet 13C and the outer layer sheet. The material 12C is closer to the skin-facing side than the material 12C and includes a non-stretchable sheet. The outer sheet 12A, the outer sheet 12C, and the outer sheet 12B include different sheets, but are adjacent to each other in the longitudinal direction of the diaper 1 and the outer sheet 12A and the outer sheet 12C, and the outer sheet 12B and the outer sheet 12C is joined in a state where the ends in the longitudinal direction X overlap each other. On the other hand, the inner layer sheet 13A, the inner layer sheet 13C, and the inner layer sheet 13B include one continuous sheet. The stretchable sheets forming the outer layer sheets 12A and 12B are at least stretchable in the transverse direction Y of the diaper 1, and are stretched in the transverse direction Y with the outer layer sheet 12C, the inner layer sheet 13A, and the inner layer sheet.材 13B were joined. On the inner layer sheet 13A of the ventral portion A and the inner layer sheet 13B of the back side portion B, the end fixing sheets 14A and 14B cover the both ends of the absorbent body 10 in the longitudinal direction. And configuration. Of the end-fixing sheets 14A and 14B, the end opposite to the crotch lower portion C side is joined to the opposite surface across the entire area in the transverse direction Y of the diaper 1 and covers the longitudinal direction of the absorbent body 10 The end portion is joined to the skin-facing surface of the absorbent body 10. This prevents the feet and the like from catching both ends of the absorbent body 10 when wearing the diaper 1. Here, the stretchable sheet refers to a sheet having a maximum elongation of at least 100% in the same direction as the transverse direction Y and an elongation of 100% in the same direction as the transverse direction Y. After that, the elongation recovery rate (elongation recovery rate at 100% elongation) at the time of contraction is at least 70% or more. The non-stretchable sheet refers to a sheet having a maximum elongation of at least 10% in a direction at least the same as the lateral direction Y (a sheet extending only 1.1 times in length). The maximum elongation and elongation recovery were measured as follows. <Measurement method of elongation recovery rate> A strip-shaped sample piece having a length of 50 mm and a width of 25 mm is cut out from a sheet to be measured, and a commercially available tensile tester (for example, TENSILON RTG-1310 manufactured by ORIENTEC) is used, For the sample piece, the initial distance D ₀ between chucks was set to 40 mm, and the sample piece was stretched to a length D _{2 of} 100% elongation at a stretching speed of 300 mm / min (D ₂ = D ₀ × 2 ), And then recover at the same speed as the stretching speed, and set the length of the sample piece when the tensile load becomes 0 for the first time to the length D1 after the elongation recovery. The elongation recovery at 100% elongation was calculated according to the following formula. Elongation recovery rate at 100% elongation (%) = [(D ₂ ﹣D ₁ ) / (D ₂ ﹣D ₀ )] × 100 The elongation recovery rate or the maximum elongation rate in the same direction as the transverse direction Y of the diaper For the measurement, a sample sheet having a length of 50 mm in the direction corresponding to the lateral direction Y and a length of 25 mm in the direction corresponding to the longitudinal direction X of the diaper was used in the same direction as the longitudinal direction X of the diaper. When measuring the elongation recovery or the maximum elongation, a sample sheet having a length of 50 mm in the direction corresponding to the longitudinal direction X of the diaper and a length of 25 mm in the direction corresponding to the transverse direction Y of the diaper was used. <Measurement method of maximum elongation> The sample piece having the same size as the sample piece used in the above-mentioned method of measuring the elongation recovery rate is stretched under the same conditions, and the elongation at the time of breaking is set to the maximum elongation. Various known members can be used as the stretchable sheet. For example, the stretchable sheet described in Japanese Patent Laid-Open No. 2008-179128, the stretchable sheet described in Japanese Patent Laid-Open No. 2007-22066, The stretchable nonwoven fabric manufactured by the manufacturing method of the stretchable nonwoven fabric described in Unexamined-Japanese-Patent No. 2007-22066, the patent publication 3054930, etc. As shown in FIG. 4, in a natural flat state, the diaper 1 of the present embodiment connects the lower end Sd of the side seal portion S with the front end 8a of the three-dimensional fold 8 and the front end 8a passing through the three-dimensional fold 8 The angle θ formed by the second imaginary straight line L2 extending in the transverse direction Y of the pants-type absorbent article 1 is 40 ° or more and 60 ° or less, and the front end 8a of the three-dimensional fold 8 stands higher than the three-dimensional fold 8 The base end 8b is closer to the center side in the horizontal direction (the center line CL side in the vertical direction) of the pants-type absorbent article 1. When the side seal portion S has a certain length (width) in the transverse direction Y, the first imaginary straight line L1 is the lower end Sd (the corner portion near the side of the absorbent body 10) near the center in the transverse direction of the diaper 1. It is connected to the front end 8a of the three-dimensional pleats 8. In the diaper 1 of the present embodiment, by setting the angle θ above to be 40 ° or more, the foot can be put down just below the foot, so that the foot can easily pass through the leg opening 6, and the foot can be prevented from being caught on the side. The seal S is near the lower end. In addition, by setting the angle θ described above to 60 ° or less, when the wearer wears it while standing on his own, his feet easily pass through the leg openings 6, and it is not necessary to incline the body significantly for wearing. Wait for a reluctant gesture. In addition, the front end 8a of the three-dimensional fold 8 is closer to the lateral center side of the diaper 1 than the raised base end 8b, and the three-dimensional fold 8 is inclined toward the central side of the horizontal direction. As a result, the three-dimensional fold 8 does not easily exist in the foot through the leg opening. The wires of the portion 6 can also prevent the feet or toes from hooking the three-dimensional folds 8 and making it difficult to wear. When the wearer wears it while standing, it is easier for the foot to pass through the leg opening 6, and the angle θ formed above is preferably 44 ° or more, and more preferably 46 ° or more. Furthermore, it is preferably 58 ° or less, more preferably 56 ° or less, and more preferably 44 ° or more and 58 ° or less, and still more preferably 46 ° or more and 56 ° or less. The natural flat state refers to a state in which the pants-type absorbent article is placed on a horizontal surface with the back side B side facing down and the ventral side A side facing upward, and the pants-type absorbent article naturally contracts. The angle θ formed, the positional relationship between the front end of the three-dimensional folds and the standing base end, and the like were investigated as follows. That is, an acrylic resin plate is placed on a pant-type absorbent article lying on a horizontal surface so that the back side portion B faces down and the abdomen portion A side faces upward, and 4.5 kPa is applied thereon. Load the weight and leave it for 12 hours. After standing for 12 hours, photograph the flattened pants-type absorbent article from directly above, and in the pants-type absorbent article in this state, the lower end Sd of the side seal portion, the front end 8a of the three-dimensional fold 8 and the three-dimensional fold 8 The position of the basal end 8b was raised and investigated, and the positions thereof were recorded on the image. Then, based on this image, the angle θ formed by the straight line L1 and the straight line L2 is measured. The straight line L1 connects the lower end Sd of the side seal portion with the front end 8a of the three-dimensional fold 8 and the straight line L2 passes through the front end of the three-dimensional fold 8. 8a extends in the transverse direction Y of the pants-type absorbent article 1, and the positional relationship between the front end 8a and the standing base end 8b of the three-dimensional fold is investigated. Furthermore, the position of the front end 8a of the three-dimensional pleats is the top-bottom direction of the pants-type absorbent article in a natural flat state in the longitudinal direction of the front end 8a of the three-dimensional folds [upper-bottom direction]. The position is generally equivalent to the folded-back position (that is, the middle position in the longitudinal direction X of the pants-type absorbent article) when the pants-type absorbent article is mounted in the self-expanded state in most cases. Regarding the position of the raised base end 8b of the three-dimensional gathers, when the pant-type absorbent article is brought into an expanded and extended state, the position in the longitudinal direction X is the same as the position of the front end 8a of the three-dimensional gathers. Before placing the acrylic resin plate, adjust it in advance by gently stretching the side seals to the left and right with your hands, and then release your hands to change the dorsal and ventral portions of the overlapped state. Got flat. In a pants-type absorbent article in a naturally flat state, the distance L3 (refer to FIG. 4) of the front end 8a of the three-dimensional fold from the standing base end 8b of the three-dimensional fold 8 is preferably more than 10% of the width L4 of the lower end of the lower part C, More preferably, it is 12% or more and 30% or less. The lower end width L4 is preferably 80 mm or more, more preferably 100 mm or more, still more preferably 250 mm or less, and still more preferably 210 mm or less. It is preferable that the three-dimensional pleats 8 are continuous from the base 8b to the front end 8a (free area 81c of the three-dimensional fold-forming sheet) and face the central side of the pants-type absorbent article in the lateral direction. Further, in a pants-type absorbent article in a naturally flat state, the distance L5 (see FIG. 4) between the lower end Sd of the side seal portion and the front end 8a of the three-dimensional fold is preferably 50% or more of the width L4 of the lower end of the lower part C and 250% or less, more preferably 100% or more and 200% or less. The distance L5 is preferably 80 mm or more, more preferably 100 mm or more, still more preferably 200 mm or less, and still more preferably 180 mm or less. In the diaper 1 of this embodiment, the maximum extension length L6 (see FIG. 5) between the side seals S and S of one of the waist openings 5 is more than three times the width L4 of the lower end of the lower part of the hip in a natural flat state. If the maximum extension length L6 is set to be more than three times the width L4 of the lower end of the lower crotch, when the diaper 1 is worn, the waist opening 5 can be greatly enlarged relative to the width L4 of the lower end of the lower crotch, and it is easy to visually confirm the legs One side of the opening portion 6 allows the foot to pass through the leg opening portion 6, making it easier for the wearer to wear the diaper 1 by himself. From the viewpoint of more reliably exhibiting this effect, the maximum elongation length L6 is preferably 3 times or more the width L4 of the lower end of the lower part of the chin, more preferably 3 times or more and 5 times or less, and still more preferably 3.3 times or more and 4.5 or more. Times below. The maximum elongation length L6 is measured by the following method. [Measurement method of the maximum elongation length] A range of 2 cm from the upper end of each of the left and right side seals is clamped into a chuck of a tensile tester (manufactured by Orientech, trade name "RTA-100"), and will be 300 mm / When the distance between the side seals was increased in seconds, the distance between the side seals at the point when the tensile load became 0.1 N / cm was set to the above-mentioned maximum extension length L6. Further, in a natural flat state of the diaper 1 of this embodiment, the distance L7 (see FIG. 4) in the transverse direction Y of the pant-type absorbent article between the lower end Sd of the side seal portion and the side end portion Cs of the lower portion of the crotch is 胯The lower end width L4 is 0.2 times or more. If the distance L7 is set to be 0.2 times or more the width L4 of the lower end of the lower part of the chin and the width of the leg opening 6 when the diaper 1 is worn, it is easy to visually confirm that the leg opening 6 allows the foot to pass through the leg. When the leg opening 6 passes through the leg opening 6, it is difficult for the feet or toes to catch around the leg opening 6. From this point of view, the distance L7 is preferably 0.2 times or more, preferably 0.3 times or more and 2 times or less, and more preferably 0.5 times or more and 1.5 times or less, the lower end width L4 of the lower part of the chin. The distance L7 is measured in such a manner that, in the image when the angle θ formed above is measured, in addition to the position of the lower end Sd of the side seal portion, the side end portion Cs of the lower portion C is also written. The position was measured from the distance between Sd and Cs in the direction of the pan-type absorbent article (see FIG. 4). The outer covering material 11 of the diaper 1 of the present embodiment includes a waist elastic member 51 for imparting elasticity to the opening peripheral edge portion of the waist opening 5. The waist elastic member 51 is fixed between the outer-layer sheet 12A and the inner-layer sheet 13A and the outer-sheet 12B and the inner-sheet 13B of the back side B in an extended state. The outer covering material 11 of the diaper 1 of the present embodiment includes a leg elastic member 61 for imparting elasticity to an opening peripheral edge portion of the leg opening portion 6. More specifically, as the leg elastic member 61, there is a first leg elastic member 61a disposed from the abdominal portion A to the lower crotch C, and a second leg elastic disposed from the dorsal portion B to the lower crotch C. Member 61b. The first leg elastic member 61a and the second leg elastic member 61b each include an outer end portion located at the side seal portion S, a middle portion disposed along a peripheral edge portion of the leg opening portion 6, and an inner extension portion It extends away from the peripheral edge portion of the leg opening portion 6 and extends toward the central side in the horizontal direction (the central line CL side in the vertical direction) of the absorbent body 10. The first leg elastic member 61 a and the second leg elastic member 61 b are separated from each other over the entire area in the lateral direction of the lower crotch C. The first leg elastic member 61a and the second leg elastic member 61b are spaced apart from each other, thereby ensuring elasticity at the peripheral edge portion of the leg opening portion 6 and preventing the leg opening portion 6 from contracting significantly, and is suitable for wearing a diaper 1 In this case, it is easier to pass the foot through the leg opening 6. From the viewpoint of ensuring good fit around the legs and ease of lifting the foot, the shortest distance L8 in the longitudinal direction between the first leg elastic member 61a and the second leg elastic member 61b (see Fig. 2) The total length L (refer to Fig. 2) of the longitudinal direction of the diaper 1 is preferably 15% or more and 50% or less, and more preferably 20% or more and 45% or less. As shown in FIG. 2, in the diaper 1 of the present embodiment, the elastic member extending in the longitudinal direction X is not arranged in the area C1 except for the elastic member 82 arranged in three-dimensional folds. Between the arrangement region of the first leg elastic member 61a of the first leg elastic member 61a and the arrangement region of the second leg elastic member 61b where the second leg elastic member 61b is disposed. That is, in the region C1, the elastic member 82 extending in the longitudinal direction X is not disposed on the exterior material 11, and in the region C1, the elastic member 82 is also disposed on the absorbent body 10 in addition to the three-dimensional folds. Other than that, no elastic member extending in the longitudinal direction X is arranged. From the viewpoint of preventing the leg openings 6 from contracting significantly and making it easier for the feet to pass through the leg openings 6 when wearing the diaper 1, it is preferable not to arrange them in the longitudinal direction on the exterior material 11 outside the area C1. The elastic member extending in the direction X is preferably not arranged in the region C1, except for the elastic member 82 arranged in three-dimensional folds, in the entire pants-type absorbent article including the exterior material 11 and the absorbent body 10. There is an elastic member extending in the longitudinal direction X. As the waist elastic member 51 and the leg elastic members 61a and 61b, various elastic members previously used in disposable diapers can be used, and examples thereof include styrene-butadiene, butadiene, isoprene, and chlorine. Synthetic rubber such as butadiene rubber, natural rubber, EVA, stretchable polyolefin, polyurethane, etc. As the form of the elastic member, a filament (rubber thread, etc.), a rope (rubber band, etc.), or a multifilament type having a rectangular, square, circular, oval, or polygonal cross-section can be preferably used. Filamentous and so on. As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not limited to the said embodiment, It can change suitably. For example, the exterior material 11 may be one in which the outer layer sheet includes one continuous sheet throughout the ventral portion A, the lower portion C, and the back portion B. Further, the outer sheet 12C of the lower part C may include a stretchable sheet. The exterior material 11 may be composed of only one non-stretchable sheet. Alternatively, instead of the outer sheet 12A and 12B and the inner sheet 13A and 13B, the end fixing sheets 14A and 14B may be replaced with one of the outer sheet 12A and 12B and the inner sheet 13A and 13B. One or both of the continuous sheets are folded back at the peripheral end of the waist opening, and the folded back portion is used as an end fixing sheet. One or both of the end-fixing sheets 14A and 14B may be used. In addition, the exterior material 11 may be composed of only the non-stretchable sheet as a whole of the outer sheet and the inner sheet, or may be composed of only a stretchable sheet as a whole. Constructor. In addition, the pants-type absorbent article of the present invention can also replace the pants-type disposable diapers for adults, and the pants-type disposable diapers for children's diaper training, or the pants-type menstrual tampons. Regarding the embodiment (aspect) of the present invention described above, the following pants-type absorbent article will be disclosed. <1> A pants-type absorbent article comprising an absorbent body and an exterior material, the absorbent body having a longitudinal direction corresponding to the front and back directions of the wearer and a transverse direction orthogonal to the longitudinal direction, including an absorbent body, There are three-dimensional folds on both sides in the longitudinal direction, and the exterior material is disposed on the non-skin facing surface side of the absorbent body; and the pants-type absorbent article has an abdomen disposed on the ventral side of the wearer when worn. A side portion, a back side portion disposed on the back side of the wearer, and a lower portion located therebetween; a pair of side seal portions are formed by joining both sides of the ventral portion and both sides of the back portion A waist opening and a pair of leg openings; the three-dimensional folds have a front end and a standing base end respectively extending in the longitudinal direction of the absorbent body; in a naturally flat state, the lower end of the side seal portion is connected to the The angle θ formed by the first imaginary straight line connecting the front ends of the three-dimensional folds and the second imaginary straight line passing through the front end of the three-dimensional folds and extending in the lateral direction of the pants-type absorbent article is 40 ° or more and 60 ° Below; and The rising base end of the distal end of said three-dimensional fold of pleats of the perspective closer than the transverse direction of the absorbent article of the pant center side. <2> The pants-type absorbent article according to the above <1>, wherein the maximum extension length L6 between the side seals of one of the waist openings is 3 of the lower end width L4 of the lower part of the hip in the natural flat state Times more. <3> The pants-type absorbent article according to the above <2>, wherein the maximum elongation length L6 is 3 times or more and 5 times or less, and more preferably 3.3 times or more and 4.5 times or less, of the width L4 of the lower end of the lower part. <4> The pants-type absorbent article according to any one of <1> to <3>, in the natural flat state, between the lower end of the side seal portion and the side end portion of the lower crotch portion. The distance L7 in the lateral direction of the pants-type absorbent article is 0.2 times or more the width L4 of the lower end of the lower part of the crotch. <5> The pants-type absorbent article according to the above <4>, wherein in the naturally flat state, the transverse direction of the pants-type absorbent article between the lower end of the side seal portion and the side end portion of the lower portion of the crotch The distance L7 in the direction is 0.3 times or more and 2 times or less, and more preferably 0.5 times or more and 1.5 times or less. <6> The pants-type absorbent article according to any one of <1> to <5>, which is provided as a leg elastic member that provides elasticity to an opening peripheral edge portion of the leg opening portion, A first leg elastic member disposed from a side portion to the lower crotch portion, and a second leg elastic member disposed from the back side portion to the lower crotch portion, and the first leg elastic member and the second leg elastic member They are separated from each other across the entire area in the transverse direction of the lower part of the chin. <7> The pants-type absorbent article according to the above <6>, wherein the shortest distance L8 in the longitudinal direction of the diaper (the pants-type absorbent article) between the first leg elastic member and the second leg elastic member It is 15% or more and 50% or less, and more preferably 20% or more and 45% or less of the total length L of the said longitudinal direction of a diaper (pants-type absorbent article). <8> The pants-type absorbent article according to the above <6> or <7>, wherein the arrangement region of the first leg elastic member and the second leg elastic member in the longitudinal direction of the pants-type absorbent article Except for the elastic member disposed in the three-dimensional pleats, the region between the arrangement regions is not provided with an elastic member extending in the longitudinal direction. <9> The pants-type absorbent article according to the above <6> or <7>, wherein the arrangement region of the first leg elastic member and the second leg elastic member in the longitudinal direction of the pants-type absorbent article The area between the arrangement areas is not provided with an elastic member extending in the longitudinal direction on the exterior material. <10> The pants-type absorbent article according to any one of the above <1> to <9>, which is provided as a leg elastic member that provides elasticity to an opening peripheral edge portion of the leg opening portion, A first leg elastic member disposed from a side portion to the lower crotch portion, and a second leg elastic member disposed from the back side portion to the lower crotch portion, and the first leg elastic member and the second leg elastic member They are each provided with an outer end portion located at the side seal portion, a middle portion disposed along the peripheral edge portion of the leg opening portion, and an inner extension portion remote from the peripheral edge portion of the leg opening portion and extending transversely to the absorbent body. The direction center side (the longitudinal direction center line CL side) extends. <11> The pants-type absorbent article according to any one of <1> to <10>, wherein the angle θ formed above is preferably 44 ° or more, and more preferably 46 ° or more. It is preferably at most 58 °, more preferably at most 56 °, still more preferably at least 44 ° and at most 58 °, still more preferably at least 46 ° and at most 56 °. <12> The pants-type absorbent article according to any one of <1> to <11>, in the pants-type absorbent article in a naturally flat state, the front end of the three-dimensional pleats is separated from the three-dimensional folds. The distance L3 of the rising base end is preferably 10% or more, and more preferably 12% or more and 30% or less of the width of the lower end of the lower part of the chin. <13> The pants-type absorbent article according to any one of <1> to <12>, in the pants-type absorbent article in a naturally flat state, the front end of the three-dimensional pleats is separated from the three-dimensional folds. The distance L3 of the raised base end is 250 mm or less, preferably 210 mm or less. <14> The pants-type absorbent article according to any one of the above <1> to <13>, in the pants-type absorbent article in a naturally flat state, the lower end of the side seal portion and the front end of the three-dimensional fold The distance L5 is preferably 50% or more and 250% or less, and more preferably 100% or more and 200% or less of the width L4 of the lower end of the lower part of the chin. <15> The pants-type absorbent article according to any one of the above <1> to <14>, in the pants-type absorbent article in a naturally flat state, the lower end of the side seal portion and the front end of the three-dimensional fold The distance L5 is preferably 80 mm or more, more preferably 100 mm or more, more preferably 200 mm or less, and still more preferably 180 mm or less. <16> The pants-type absorbent article according to any one of the above <1> to <15>, wherein the absorbent body has a liquid-permeable front sheet, a liquid-impermeable back sheet, and an interposer The liquid-retaining absorbent described above disposed between two sheets. <17> The pants-type absorbent article according to any one of <1> to <16>, wherein the three-dimensional pleats have a three-dimensional fold forming sheet and an elastic member fixed to the sheet in an extended state. <18> The pants-type absorbent article according to the above <17>, wherein the three-dimensional wrinkle-forming sheet has a fixed region fixed to a constituent member of the absorbent body in the lower part of the chin and is not fixed to the absorbent The free domain of the constituent members of the body, the free domain and the elastic member fixed to the free domain in an extended state form the three-dimensional fold. <19> The pants-type absorbent article according to any one of <17> or <18>, in which the three-dimensional wrinkle-forming sheet is located in the lateral direction than the standing base end of the three-dimensional wrinkle. The outer part is rolled down from the skin-facing side to the non-skin-facing side of the absorbent body, and the non-skin-facing side of the absorbent body is joined to at least one of the back sheet and the exterior material. And a part fixed to the front sheet on the skin-facing side of the absorbent body. <20> The pants-type absorbent article according to any one of the above <1> to <19>, in which the three-dimensional pleats are formed in the lower part of the crotch or between the lower part of the crotch and the ventral side One of the back portion and the back portion is erected away from the front sheet facing the skin facing the absorbent body. <21> The pants-type absorbent article according to any one of <1> to <20>, wherein the exterior material of each of the ventral portion and the backside portion has an outer layer sheet and an inner layer sheet The outer layer sheet includes a stretchable sheet, and the inner layer sheet is closer to the skin-facing side than the outer layer sheet and includes a non-stretchable sheet. <22> The pants-type absorbent article as described in any one of said <1> to <21> which is a pants-type absorbent article for adults. <23> The pants-type absorbent article according to any one of <1> to <22>, wherein the first imaginary straight line L1 is near the center of the pants-type absorbent article in which the side seal portion is formed in the lateral direction. The lower end (the corner near the side of the absorbent body) is a straight line connecting the front end of the three-dimensional pleats. [Examples] Hereinafter, the present invention will be described in more detail based on examples. However, the scope of the present invention is not limited in any way by the embodiment. [Examples 1 and 2] The following pants-type disposable diapers were produced, which have the structure shown in Figs. 1 to 3, and the dimensions of each part shown in Figs. 2, 4, and 5 are shown in Table 1. Show the size. [Comparative Examples 1 to 5] Commercially available adult-type disposable diapers were prepared. The dimensions of each of the parts shown in Figs. 2, 4, and 5 are measured and shown in Table 1. In addition, regarding the position of the front end of the three-dimensional pleats, the case where the front end of the three-dimensional pleats is higher than the three-dimensional folds and the base end is located at the central side in the horizontal direction of the pants-type disposable diaper is set to "+", and the three-dimensional folds are raised The case where the base end is located on the outer side in the horizontal direction is set to "-". Moreover, the pants type disposable diaper of the comparative example 5 does not have a three-dimensional wrinkle. [Evaluation] For the pants-type disposable diapers of Examples 1 and 2 and Comparative Examples 1 to 5, the following methods were used to swing the feet through the pants-type disposable diaper and The length of the subject's center of gravity rocking trajectory when performing the lifting action was measured, and the ease of wearing when standing on its own (easiness of foot penetration and ease of lifting to the knee) was evaluated. . <Evaluation method of ease of wearing> Fifteen subjects were subjected to the following wearing motions to each diaper on a gravity center shake meter, and the gravity center shaking of the subjects during the wearing movement was measured to calculate The center of gravity swing track length. The subjects who performed the dressing motion were 15 healthy elderly people in their 60s to 70s. The order of waiting for wearing is random, and each subject does not know which type of diaper to wear. [Wearing action] (1) While standing on the center of gravity shaker, hold both sides of the diaper in hand and unfold the diaper. Then, put one's feet one by one into a pair of leg openings (the feet pass through) in the unfolded state. Regardless of the order of the feet. (2) After placing both feet in the diaper, hold both sides of the diaper in a standing state, and pull the diaper to the knee position (perform the lifting action). (3) After pulling the diaper to the knee position, let go of your hand and stand still for 10 seconds with the posture of facing upright. Table 1 shows the average value of the center-of-gravity trajectory length of 15 subjects of each diaper. The gravity center shake meter is a foot pressure detection device that detects the vertical force of the sole pressure using a converter and outputs the shake of the foot pressure center as an electrical signal change to check the balance function. Specifically, the system Gravicorder G-5500 (Anima Co., Ltd.) was used as the center of gravity shaker. The length of the center-of-gravity trajectory becomes an indicator of how easy the diaper is to wear (the ease with which the foot can pass and the ease with which it can be pulled up to the knee). That is, the shorter the center-of-gravity trajectory length, the more stable the center of gravity of the body, and the easier it is for the foot to pass through the diaper and be pulled up to the knee. In addition, the longer the center of gravity swing trajectory, the more unstable the center of gravity of the body, and the more difficult it is to move the foot through the diaper and lift it to the knee. Θ, L, L3 to L8 in Table 1 are as follows. θ: The angle formed by the first imaginary straight line L1 and the second imaginary straight line L2 L: The total length L3 of the diaper 1 in the longitudinal direction: the distance L4 from the standing base end 8b of the three-dimensional fold 8: the width L5 of the lower end of the lower part C: The distance L6 between the lower end Sd of the side seal and the front end 8a of the three-dimensional fold: the maximum extension length L6 of the distance between the side seals L7: In the natural flat state, the lower end Sd of the side seal and the side end Cs of the lower part of the crotch Distance L8 in the transverse direction Y of the pants-type absorbent article: the shortest distance in the longitudinal direction between the first leg elastic member 61a and the second leg elastic member 61b [Table 1] As shown in Table 1, It can be seen that the center of gravity trajectory length of the diapers of Examples 1 and 2 of the present invention is 130 cm or less, which is shorter than that of the diapers of Comparative Examples 1 to 5 (the center of gravity trajectory length exceeds 130 cm), so Easy to wear while standing. The center of gravity swing track length is preferably 130 cm or less, and more preferably 125 cm or less. [Industrial Applicability] The pants-type absorbent article of the present invention can be easily worn by itself when standing.

1‧‧‧ Pant type disposable diapers
2‧‧‧ front sheet
3‧‧‧Back sheet
4‧‧‧ Absorber
5‧‧‧ waist opening
6‧‧‧ leg opening
8‧‧‧ three-dimensional folds
8a‧‧‧Front
8b‧‧‧ erect base
8e‧‧‧ Part of the sheet for forming three-dimensional folds
10‧‧‧ Absorptive body
11‧‧‧ Exterior materials
12A‧‧‧Outer sheet
12B‧‧‧Outer sheet
12C‧‧‧Outer sheet
13A‧‧‧Inner sheet
13B‧‧‧Inner sheet
13C‧‧‧Inner sheet
14A‧‧‧ Sheet for end fixing
14B‧‧‧End fixing sheet
51‧‧‧ waist elastic member
61a‧‧‧First leg elastic member
61b‧‧‧ 2nd leg elastic member
81‧‧‧Three-dimensional wrinkle forming sheet
81a‧‧‧free domain
81b‧‧‧ fixed domain
82‧‧‧elastic member
A‧‧‧ ventral
A1‧‧‧ Both sides of ventral part
B‧‧‧Back side
B1‧‧‧ both sides of the back side
C‧‧‧ 胯 Lower
Cs‧‧‧ 胯 Side end of the lower part
CL‧‧‧ longitudinal center line
C1‧‧‧ area
L‧‧‧ Diameter 1 full length in longitudinal direction
L1‧‧‧The first imaginary straight line
L2‧‧‧ 2nd imaginary straight line
L3‧‧‧The distance from the front end of the three-dimensional fold to the base of the three-dimensional fold
L4‧‧‧ 胯 Lower end width
L5 Distance between the lower end of the side seal and the front end of the three-dimensional fold
L6‧‧‧Maximum elongation between side seals
L7 The distance in the horizontal direction Y of the pants-type absorbent article between the lower end of the side seal portion and the side end portion of the lower part of the crotch in a naturally flat state
L8‧‧‧The shortest distance in the longitudinal direction between the first leg elastic member and the second leg elastic member
S‧‧‧side seal
Sd‧‧‧Side end of side seal S
X‧‧‧Horizontal
Y‧‧‧Vertical direction θ‧‧‧ Angle formed by the first imaginary straight line and the second imaginary straight line

FIG. 1 is a perspective view showing a wearing state of a pants-type disposable diaper according to an embodiment of the pants-type absorbent article of the present invention. FIG. 2 is a developed plan view showing the expanded and extended state of the diaper shown in FIG. 1. FIG. FIG. 3 is a sectional view taken along the line III-III in FIG. 2. Fig. 4 is a view showing a natural flat state of the diaper shown in Fig. 1. Fig. 5 is a view showing a state where the waist opening portion of the diaper shown in Fig. 1 is stretched.

1‧‧‧ Pant type disposable diapers

5‧‧‧ waist opening

6‧‧‧ leg opening

8‧‧‧ three-dimensional folds

8a‧‧‧Front

8b‧‧‧ erect base

C‧‧‧ 胯 Lower

Cs‧‧‧ 胯 Side end of the lower part

CL‧‧‧ longitudinal center line

L1‧‧‧The first imaginary straight line

L2‧‧‧ 2nd imaginary straight line

L3‧‧‧The distance from the front end of the three-dimensional fold to the base of the three-dimensional fold

L4‧‧‧ 胯 Lower end width

L5 Distance between the lower end of the side seal and the front end of the three-dimensional fold

L7 The distance in the horizontal direction Y of the pants-type absorbent article between the lower end of the side seal portion and the side end portion of the lower part of the crotch in a naturally flat state

S‧‧‧side seal

Sd‧‧‧Side end of side seal S

Y‧‧‧Vertical

θ‧‧‧ The angle formed by the first imaginary straight line and the second imaginary straight line

Claims (23)

A pants-type absorbent article includes an absorbent body and an exterior material. The absorbent body has a longitudinal direction corresponding to the front and back directions of the wearer and a transverse direction orthogonal to the longitudinal direction. The absorbent body is included in the longitudinal direction. There are three-dimensional folds on both sides of the direction, and the exterior material is disposed on the non-skin facing surface side of the absorbent body; the pants-type absorbent article has a ventral portion disposed on the ventral side of the wearer when placed, and disposed A back side portion on the back of the wearer and a lower portion located therebetween; a pair of side seal portions, a waist opening portion, and a pair of side seal portions are formed by joining both sides of the ventral portion and both sides of the back portion. A pair of leg openings; and the three-dimensional fold has a front end and a standing base end respectively extending in the longitudinal direction of the absorbent body, and in a naturally flat state, the lower end of the side seal portion and the three-dimensional fold are The angle θ formed by the first imaginary straight line connecting the front ends and the second imaginary straight line passing through the front end of the three-dimensional pleats and extending in the lateral direction of the pants-type absorbent article is 40 ° or more and 60 ° or less, and the above Stand Fold than the distal end of the rising base end of the three-dimensional gathers closer to the transverse direction of the absorbent article of the pant center side. For example, the pants-type absorbent article according to claim 1, wherein the maximum extension length L6 between the side seals of one of the waist openings is more than three times the width L4 of the lower end of the lower part of the crotch in the naturally flat state. For example, the pants-type absorbent article according to claim 2, wherein the maximum extension length L6 is 3 times to 5 times the width L4 of the lower end of the lower part of the chin. For example, the pants-type absorbent article according to claim 1, wherein in the natural flat state, the distance L7 in the lateral direction of the pants-type absorbent article between the lower end of the side seal portion and the side end portion of the lower part of the crotch is the above The width of the lower end of the lower part of the chin is 0.2 times or more. The pants-type absorbent article according to claim 4, wherein in the natural flat state, the distance L7 in the lateral direction of the pants-type absorbent article between the lower end of the side seal portion and the side end portion of the lower part of the crotch is the above The width L4 of the lower part of the lower part is 0.3 times or more and 2 times or less. The pants-type absorbent article according to claim 1, wherein the leg elastic member that imparts elasticity to the opening peripheral edge portion of the leg opening portion has a first leg elasticity arranged from the ventral portion to the lower chin portion. The second leg elastic member and the second leg elastic member arranged from the back side portion to the lower chin portion, and the first leg elastic member and the second leg elastic member are separated from each other throughout the entire area in the lateral direction of the lower chin portion. open. For example, the pants-type absorbent article according to claim 6, wherein the shortest distance L8 in the longitudinal direction of the pants-type absorbent article between the first leg elastic member and the second leg elastic member is the longitudinal direction of the pants-type absorbent article. The total length L of the direction is 15% or more and 50% or less. For example, the pants-type absorbent article according to claim 6, wherein the area between the arrangement region of the first leg elastic member and the arrangement region of the second leg elastic member in the longitudinal direction of the pants-type absorbent article is different from the arrangement In addition to the elastic members of the three-dimensional pleats, the elastic members extending in the longitudinal direction are not arranged. For example, the pants-type absorbent article according to claim 6, wherein a region between the arrangement region of the first leg elastic member and the arrangement region of the second leg elastic member in the longitudinal direction of the pants-type absorbent article is in the above The exterior member is not provided with an elastic member extending in the longitudinal direction. The pants-type absorbent article according to claim 1, wherein the leg elastic member that imparts elasticity to the opening peripheral edge portion of the leg opening portion has a first leg elasticity arranged from the ventral portion to the lower chin portion. A second leg elastic member and a second leg elastic member arranged from the back side portion to the lower palate portion, the first leg elastic member and the second leg elastic member are respectively provided with an outer end portion located at a side seal portion and a middle portion It is arranged along the peripheral edge portion of the leg opening portion; and the inner extension portion extends away from the peripheral edge portion of the leg opening portion and extends toward the central side in the lateral direction of the absorbent body. For example, the pants-type absorbent article according to claim 1, wherein the angle θ formed above is 44 ° or more and 58 ° or less. For example, in the pants-type absorbent article according to claim 1, in the pants-type absorbent article in a natural flat state, the distance L3 between the front end of the three-dimensional folds and the standing base end of the three-dimensional folds is the width of the lower end of the lower part Over 10%. For example, in the pants-type absorbent article according to claim 1, in the pants-type absorbent article in a naturally flat state, the distance L3 between the front end of the three-dimensional folds and the standing base end of the three-dimensional folds is 250 mm or less. For example, the pants-type absorbent article according to claim 1, wherein in the pants-type absorbent article in a natural flat state, the distance L5 between the lower end of the side seal portion and the front end of the three-dimensional fold is the width L4 of the lower end of the crotch portion. 50% to 250%. For example, in the pants-type absorbent article of claim 1, in the pants-type absorbent article in a naturally flat state, the distance L5 between the lower end of the side seal portion and the front end of the three-dimensional fold is 80 mm or more and 200 mm or less. . For example, the pants-type absorbent article according to claim 1, wherein the absorbent body has a liquid-permeable front sheet, a liquid-impermeable back sheet, and the liquid-retaining absorbent interposed between the two sheets. . The pants-type absorbent article according to claim 1, wherein the three-dimensional pleats include a sheet for forming three-dimensional pleats, and an elastic member fixed to the sheet in an extended state. For example, the trouser-type absorbent article according to claim 17, wherein the three-dimensional wrinkle-forming sheet is a fixed region having a constituent member fixed to the absorbent body in the lower part of the chin and a constituent member not fixed to the absorbent body. A free domain that forms the three-dimensional folds with the elastic member fixed to the free domain in an extended state. The pants-type absorbent article according to claim 17, wherein in the sheet for forming the three-dimensional folds, a part further outside the lateral direction than the standing base end of the three-dimensional folds is from the skin-facing side of the absorbent body It rolls down to the non-skin facing surface side, and has a portion which is joined to at least one of the back sheet and the exterior material on the non-skin facing surface side of the absorbent body, and the skin facing surface side of the absorbent body. The part fixed on the front sheet. The pants-type absorbent article according to claim 1, wherein the three-dimensional pleats are formed away from the lower part of the crotch or between the lower part of the crotch and each of the ventral part and the back part. The skin of the above-mentioned absorptive body stands on the front sheet facing the skin. For example, the pants-type absorbent article according to claim 1, wherein the outer material of each of the ventral portion and the back portion has a structure in which an outer layer sheet and an inner layer sheet are laminated, and the outer layer sheet includes stretchability A sheet, which is closer to the skin-facing side than the outer layer and includes a non-stretchable sheet. If the pants-type absorbent article of claim 1 is a pants-type absorbent article for adults. For example, the pants-type absorbent article according to claim 1, wherein the first imaginary straight line L1 connects the lower end near the center in the lateral direction of the pants-type absorbent article of the side seal portion or the corner portion near the side of the absorbent body with A straight line connecting the front ends of the three-dimensional folds.