JP3207593U - Pants-type disposable diaper - Google Patents

Abstract

Disclosed is a pants-type disposable diaper that can be easily put on an infant with both legs lying on their back in an M-shape. A diaper 1 has the following requirements (1) to (6). (1) The length L1 of the internal dimension in the waist part of the diaper of a natural state is 90 mm or more and 150 mm or less. (2) The total length in the vertical direction when the diaper is unfolded and extended to the maximum is 350 mm or more and 480 mm or less. (3) The circumference length of the waist opening WH in the extended state of the diaper is 600 mm or more and 720 mm or less. (4) The ratio of the length of the inner dimension of the waist part in the extended state with 10 N load applied to the length L1 is 225% or more. (5) The ratio of the length of the inner dimension of the waist portion in a state where the load is released with respect to the length L1 is 140% or less. (6) Young's modulus at the waist is 2.4 × 10 −4 N / mm 2 or less. [Selection] Figure 1

Description

  The present invention relates to a pants-type disposable diaper.

  The present applicant has previously proposed a pants-type disposable diaper that is considered to be worn in a laid state for a low-aged child who cannot grasp and stand (for example, Patent Document 1). According to the pants-type disposable diaper for a low-age child described in Patent Document 1, the foot of the low-age child can be easily passed through the leg opening, and can be easily put on the low-age child.

JP 2005-198783 A

  In recent years, the age of starting use of pants-type disposable diapers has become earlier, and pants-type disposable diapers have come to be used even for infants. The present inventor assumes that when an infant is put on a pants-type disposable diaper, it is assumed that the infant is put on the back in a laid state. I found.

  However, it is difficult to say that the pants-type disposable diaper described in Patent Document 1 can be easily put on an infant with both legs widened in an M shape, and for an infant with both legs widened in an M shape. There was room for further improvement.

  Therefore, this invention relates to providing the underpants type disposable diaper which can eliminate the said subject.

The present invention is an absorptive having a stretchable exterior body having a longitudinal direction corresponding to the longitudinal direction of the wearer and a lateral direction perpendicular thereto, and a liquid-retaining absorbent body fixed to the inside of the exterior body A body part, and the exterior body includes a ventral region disposed on a wearer's ventral side when worn, a dorsal region disposed on the back side of the wearer when worn, the ventral region, and the dorsal region. It is divided into an inseam region, and both side edges of the ventral region and the dorsal region are joined to form a pair of side seal portions, and a waist opening and a pair of leg openings A pants-type disposable diaper formed with a length of an inner dimension (L1) between the pair of side seal portions on the inner surface of the waist portion including the waist opening in the natural state of the pants-type disposable diaper ) 90mm to 150mm The total length in the longitudinal direction in the expanded state where the pants-type disposable diaper is unfolded and stretched to the maximum in the longitudinal direction is 350 mm or more and 480 mm or less, and the pants-type disposable diaper is stretched to the maximum in the lateral direction. The peripheral length of the waist opening in the stretched state at the opening periphery is 600 mm or more and 720 mm or less, and the pants-type disposable diaper is 10 N in the lateral direction with respect to the length (L1) of the inner dimension of the waist in the natural state. The ratio (L2 / L1) × 100) of the length (L2) of the inner dimension between the pair of side seal portions on the inner surface of the waist portion in the stretched state under load is 225% or more, Loaded from the stretched state in which the pants-type disposable diaper is loaded 10N in the lateral direction with respect to the length (L1) of the inner size of the waist portion in the natural state The ratio (L3 / L1) × 100) of the length (L3) of the inner dimension between the pair of side seal portions on the inner surface of the waist portion in a state where the weight is released is 140% or less, A pants-type disposable diaper having a Young's modulus (Y1) at the waist of 2.4 × 10 ⁻⁴ N / mm ² or less is provided.

  According to the pants-type disposable diaper of the present invention, it can be easily put on an infant lying on its back.

FIG. 1 is a perspective view schematically showing an example of a pants-type disposable diaper that is an embodiment of the absorbent article of the present invention. FIG. 2 is a developed plan view schematically showing a partially broken skin facing surface side in the developed and extended state of the diaper shown in FIG. FIG. 3 is a schematic cross-sectional view showing a cross section taken along line III-III in FIG. 2. FIG. 4 is an explanatory view showing a state where the disposable diaper shown in FIG. 1 is put on an infant in a state of lying on its back. FIG. 5 is an explanatory view showing a state where the disposable diaper shown in FIG. 1 is put on an infant laid on its back.

Hereinafter, the underpants type disposable diaper of this invention is demonstrated, referring FIGS. 1-5 based on the preferable embodiment.
The pants-type disposable diaper 1 (hereinafter also simply referred to as “diaper 1”) of the present embodiment, as shown in FIG. 1 to FIG. 3, is a longitudinal direction X corresponding to the wearer's front-rear direction and a transverse direction perpendicular thereto. A stretchable exterior body 3 having a direction Y and an absorbent main body 2 having a liquid retaining absorbent body 23 fixed inside the exterior body 3 are provided. The exterior body 3 is provided between the abdominal region A disposed on the abdomen side of the wearer when worn, the back region C disposed on the back side of the wearer when worn, the abdominal region A, and the dorsal region C. Into the inseam region B. In the diaper 1, both side edge portions AS and CS of the ventral region A and the back region C in the outer package 3 are joined to form a pair of side seal portions S and S, and a waist opening WH and A pair of leg openings LH and LH are formed.

  The above-described crotch region B is a portion disposed in the crotch portion of the wearer when the diaper 1 is worn, and the abdomen region A is the abdomen side of the wearer, that is, the longitudinal side of the wearer than the crotch region B when the diaper 1 is worn. It is a site | part distribute | arranged to the front side of the direction X, and the back side area | region C is a site | part distribute | arranged to the back side of a wearer, ie, the longitudinal direction X rather than the crotch area | region B in the wearing state of the diaper 1. In the diaper 1, the absorber 23 is distribute | arranged ranging from the ventral | abdominal area | region A to the back | dorsal area | region C, as shown in FIG. And in the diaper 1, the exterior body 3 is distribute | arranged to the non-skin opposing surface side of the absorptive main body 2. FIG. In the diaper 1, the side edges AS, AS of the ventral region A and the side edges CS, CS of the dorsal region C in the outer package 3 are connected to each other by a known joint such as an adhesive, heat seal, or ultrasonic seal. They are joined together by means.

  As shown in FIG. 2, the diaper 1 is a front side (abdominal side) of the wearer's body in a wearing state with reference to a horizontal bisector CLx that bisects the diaper 1 in the vertical direction X and extends in the horizontal direction Y. ) And a rear body R that covers the back side (back side) of the wearer's body in the wearing state. The ventral region A is a part of the front body F, the back region C is a part of the back body R, and the crotch region B extends over the front body F and the back body R. The ventral region A and the dorsal region C are portions that are in the same position as the side seal portion S in the longitudinal direction X, and are portions that are arranged around the wearer's torso when the diaper 1 is worn. The ventral region A and the dorsal region C are divided into a waist portion WT including a waist opening WH of the diaper 1 and a waistline portion DT. Here, the waist part WT is a plurality of waistline elastic members 34 to be described later, which are arranged in a region from the opening periphery of the waist opening part WH to the edge in the longitudinal direction X of the absorbent body 23 (absorbent body 2). When the stress of the elastic member changes between the adjacent waist elastic members 34, 34 by changing the thickness or elongation rate of the waist elastic member 34 disposed, the opening of the waist opening WH is changed. The waist portion WT extends from the periphery to the middle position in the longitudinal direction X between the waist elastic member 34 in which the stress of the elastic member has changed and the waist elastic member 34 adjacent to the waist opening WH on the waist elastic member 34. And Further, in the plurality of waistline elastic members 34, when the stress of the elastic member does not change and the pitch between the adjacent waistline elastic members 34 and 34 changes, the waistline WH changes from the opening periphery. A waist portion WT is defined up to a middle position in the longitudinal direction X between the waist elastic members 34 and 34 forming the pitch. Further, when the stress of the elastic member does not change and the pitch between the adjacent waist elastic members 34 and 34 does not change, the waist portion extends from the opening periphery of the waist opening WH to a position 35 mm away in the longitudinal direction X. WT. The waistline portion DT means a region from the lower end of the waist portion WT on the crotch region B side to the position of the lower end of the side seal portion S on the crotch region B side or the upper end position of the leg opening LH. The crotch region B is a region in which recesses for forming leg openings LH and LH are formed at both side edges along the longitudinal direction X of the exterior body 3. The crotch region B has an excretion portion facing portion that is disposed to face the excretion portion of the wearer when the diaper 1 is worn, and the excretion portion facing portion is usually a central portion (horizontal direction) of the diaper 1 in the vertical direction X It is located in the vicinity of the bisector CLx).

  In the diaper 1, the absorbent main body 2 has a rectangular shape in plan view as indicated by the outline in FIG. 2, and extends in the longitudinal direction X from the ventral region A to the dorsal region C. Is aligned with the longitudinal direction X of the diaper 1 in the unfolded and extended state, and is arranged at the central portion in the lateral direction Y of the exterior body 3 and joined to the exterior body 3 with an adhesive.

  In the diaper 1, as shown in FIG. 2, the absorbent main body 2 includes a liquid-permeable surface sheet 21 that forms a skin-facing surface, a liquid-impermeable or liquid-permeable or water-repellent material that forms a non-skin-facing surface. And a liquid retaining absorbent 23 disposed between the two sheets 21 and 22, and these are integrated by a known joining means such as an adhesive. The absorbent body 23 has a rectangular shape in plan view and forms the outer shape of the absorbent main body 2. In the plan view as shown in FIG. 2, the absorbent body 23 and the absorbent main body 2 have opposite longitudinal end edges. Yes. As the top sheet 21, the back sheet 22, and the absorber 23, various types conventionally used for this type of absorbent article can be used without particular limitation. For example, various nonwoven fabrics or apertured films can be used as the top sheet 21, and a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used as the back sheet 22. As the absorbent body 23, an aggregate of fiber materials such as pulp fibers or those having an absorbent core comprising water-absorbing polymer particles can be used, and the absorbent core has a liquid-permeable outer surface. It may be covered with a core wrap sheet.

  As shown in FIG. 2, a pair of leak-proof cuffs 24 made of a liquid-resistant or water-repellent and breathable sheet material are provided on both left and right sides along the longitudinal direction X of the skin-facing surface of the absorbent main body 2. , 24 are provided. In the vicinity of the free end of each leak-proof cuff 24, one or more elastic members 25 for forming a leak-proof cuff are arranged in an extended state. The leak-proof cuff 24 stands up at least in the crotch region B when the elastic member 25 arranged in the stretched state contracts when the diaper 1 is worn, thereby causing the excretion fluid such as urine to flow outward in the lateral direction Y. To prevent.

  In the present specification, the “skin facing surface” is a surface of the absorbent article or a component thereof (for example, an absorbent main body) that is directed toward the wearer's skin when the absorbent article is worn, that is, relative to the wearer's skin. The side close to the skin, and the “non-skin facing surface” is directed toward the side opposite to the skin side when the absorbent article is worn, that is, the side relatively distant from the wearer's skin. It is the surface to be. In addition, "at the time of wearing" here means a state where a normal proper wearing position, that is, a correct wearing position of the absorbent article is maintained, and the absorbent article is in a state of being deviated from the wearing position. Is not included.

  In the outer casing of the diaper 1, as shown in FIGS. 1 and 2, a waistline elastic member 34 extending in the lateral direction Y is disposed in any of the ventral region A and the dorsal region C. Here, the exterior body 3 is a main body that forms the outer shape of the diaper 1, and is also a main body that naturally forms the outer shapes of the abdominal region A, the crotch region B, and the dorsal region C. That is, the exterior body 3 has the largest area among all the components of the diaper 1 and forms the outer shape of the expanded and expanded diaper 1 as shown in FIG. The contour lines of the diaper 1, that is, the contour lines of the ventral region A, the crotch region B, and the dorsal region C are formed. The “expanded and extended state” of the diaper 1 means that the diaper 1 is separated by the side seal portion S to be in the expanded state, and the expanded diaper 1 is stretched by the elastic member of each part to design dimensions (the influence of the elastic member is not at all). It means a state in which it is expanded until it becomes the same size as when it is expanded in a flat state in the excluded state.

  In the diaper 1, the exterior body 3 has a rectangular shape in which the length in the lateral direction Y is longer than the longitudinal direction X in the ventral region A and the dorsal region C in a plan view in an unfolded and extended state as shown in FIG. 2. In the crotch region B located between the ventral region A and the dorsal region C, both side edges along the longitudinal direction X of the exterior body 3, that is, the pair of leg peripheral portions LS and LS are in the lateral direction Y. It curves in a convex arc shape toward the center. Since the exterior body 3 which is the main body forming the outer shape of the diaper 1 has such a planar view shape in the unfolded and extended state, the planar view shape of the diaper 1 in the same state is as shown in FIG. In addition, the central area in the vertical direction X has an hourglass shape that is bound inward in the horizontal direction Y.

  In the diaper 1, as shown in FIG. 3, the outer package 3 includes an outer layer sheet 31 that forms the outermost surface of the diaper 1, that is, a non-skin facing surface, and an inner layer that is disposed to face the skin facing surface of the outer layer sheet 31. The sheet 32 is configured to be included. That is, the laminated body of the outer layer sheet 31 and the inner layer sheet 32 is a main body that forms the outer shape of the diaper 1, and the main body that forms the outer shapes of the abdominal region A, the crotch region B, and the back region C. is there. In the outer package 3, the outer layer sheet 31 and the inner layer sheet 32 are made of nonwoven fabric.

  As shown in FIG. 3, the outer layer sheet 31 is a component located farthest from the wearer's skin among all the components of the diaper 1. The inner layer sheet 32 is positioned relatively closer to the wearer's body than the outer layer sheet 31 and forms the inner surface of the diaper 1, that is, the skin facing surface in the worn state. The outer layer sheet 31 and the inner layer sheet 32 are joined by an adhesive at a predetermined site. As the outer layer sheet 31 and the inner layer sheet 32, various types conventionally used as an exterior body in this type of absorbent article can be used without any particular limitation. For example, spunbond nonwoven fabric, air-through nonwoven fabric, needle punch Nonwoven fabrics by various production methods such as nonwoven fabrics are preferred.

  In the diaper 1, as shown in FIGS. 1 to 3, the leg peripheral portion LS that forms the opening peripheral edge of each of the pair of leg opening portions LH, LH has one or more leg gathers in the form of a thread or a band. The leg elastic members 33 are arranged in an extended state, whereby an annular leg gather that is substantially continuous over the entire circumference is formed on the peripheral edge of each of the pair of leg openings LH and LH.

  In the diaper 1, as shown in FIGS. 1 to 3, a thread-like or belt-like waistline elastic member 34 is laterally disposed on the waist part WT and the waistline part DT in the ventral region A and the backside region C, respectively. A plurality of waist elastic members 34 are arranged in the direction Y in an extended state, and the plurality of waist elastic members 34 are intermittently arranged at predetermined intervals in the longitudinal direction X. The waistline elastic member 34 extends over substantially the entire length in the lateral direction Y of the exterior body 3. In this way, the waistline elastic member 34 is arranged on the waist portion WT in a state where the elastic stretchability is expressed, so that the waist portion WT of the waist opening WH is substantially continuous over the entire circumference. An annular waist gather is formed.

  In the diaper 1, as shown in FIG. 2, in the region where the exterior body 3 and the absorbent main body 2 (absorbent body 23) overlap in the longitudinal direction X in the ventral region A and the back region C, respectively, Are elastically arranged at predetermined intervals in the longitudinal direction X. In the waist elastic member 34 intermittently disposed in the overlapping region, at least a part of the waist elastic member 34 is interrupted and the stretchability is hindered. It has not been. Further, in the outer body 3, in the outer region from both side edges along the longitudinal direction X of the absorbent body 23, the waistline elastic member 34 can be expanded and contracted.

  In the diaper 1, as shown in FIG. 2, the leg elastic member 33 and the waist elastic member 34 are sandwiched between the outer layer sheet 31 and the inner layer sheet 32 constituting the exterior body 3 by a bonding means such as an adhesive. It is fixed. As each elastic member 33 and 34, what formed elastic materials, such as natural rubber, a polyurethane-type resin, foamed urethane-type resin, and a hot-melt-type elastic member, in the shape of a thread (thread rubber) or a belt (flat rubber), is used preferably. It is done.

  In the diaper 1, since the exterior body 3 has the waist elastic member 34 arranged as described above, in a part of the region overlapping the absorbent body 23 of the absorbent main body 2, as shown in FIG. The waistline elastic member 34 becomes a non-stretchable region NEX that does not have stretchability, and the waistline elastic member 34 stretches and contracts in a region outward from both side edges along the longitudinal direction X of the absorber 23. This is an area EX.

  In the diaper 1, as shown in FIGS. 1 and 2, in the ventral region A and the dorsal region C, the outer layer sheet 31 extends outward in the longitudinal direction X from the edge in the longitudinal direction X of the inner layer sheet 32. And it has the folding | returning part 310 folded | folded toward the skin opposing surface of the inner layer sheet | seat 32. FIG. That is, the outer layer sheet 31 has the same shape and the same size as the inner layer sheet 32, that is, the portion constituting the main part forming the outer shape of the diaper 1. Each of which has a portion extending outward from both end edges in the longitudinal direction X, and the extended portion serves as a folded portion 310. In the diaper 1, in the ventral region A and the dorsal region C, the folded portion 310 is fixed to the skin facing surface of the inner layer sheet 32 so as to cover the end in the longitudinal direction X of the absorbent main body 2 (absorbent body 23). Has been.

  Since the diaper 1 of embodiment of this invention mentioned above comprises the following structural requirements (1)-(6), as shown in FIG. 4, the waist part WT of the waist opening part WH of the diaper 1 tends to spread. Therefore, when a user such as a guardian of an infant attaches the diaper 1 to the infant, the user moves his / her hands from the leg opening LH of the diaper 1 to the waist opening WH, for example, as shown in FIG. If both hands are spread in the inserted state, the waist part WT of the waist opening part WH is easy to spread, and both legs spread in an M-shape in a state of lying on its back are grasped with both hands, and each of the pair of leg openings LH and LH If the leg is pulled out, as shown in FIG. 5, the diaper 1 can be easily put on an infant lying on its back. Although the wearing method of the diaper 1 is not particularly limited, according to the above-described method, the diaper 1 can be easily put on an infant lying on its back.

  Component (1): The length (L1) of the inner dimension between the pair of side seal portions S and S on the inner surface of the waist portion WT including the waist opening WH in the natural state of the diaper 1 is 90 mm or more. 150 mm or less. Here, the length (L1) of the inner dimension of the waist portion WT of the diaper 1 in a natural state is a state in which a plurality of pants-type disposable diapers are stored in a pack as a product (commercial state in which the packaging bag is compressed and filled) ) Measured in the diaper 1 immediately after taking out. The measurement is performed by measuring the opening periphery of the waist opening WH, the position 15 mm away from the opening periphery of the waist opening WH toward the absorber 23 (absorbent body 2), and the opening 23 of the waist opening WH. The length between the pair of side seal portions S, S is measured at three positions 35 mm away from the main body 2) side, and the average value thereof is defined as the length (L1) of the inner dimension. From the standpoint of further achieving the above effects, the inner dimension length (L1) at the waist portion WT of the diaper 1 in the natural state is more preferably 95 mm or more, particularly preferably 100 mm or more, and 140 mm. More preferably, it is more preferably 130 mm or less, specifically more preferably 95 mm or more and 140 mm or less, and particularly preferably 100 mm or more and 130 mm or less.

  The said structural requirement (2): The full length of the vertical direction X in the expansion | extension state which expand | deployed the diaper 1 and was extended to the vertical direction X to the maximum is 350 mm or more and 480 mm or less. Here, the “expanded state in which the diaper 1 is unfolded and extended to the maximum in the longitudinal direction” means that the diaper 1 is separated by the side seal portion S to be in the unfolded state, and the unfolded diaper 1 is elongated in the longitudinal direction X It is a state where it is expanded to the design dimension (same as the dimension when expanded in the longitudinal direction X in a state where the influence of the elastic member is completely eliminated). From the viewpoint of further achieving the above effects, it is more preferably 370 mm or more in the longitudinal direction X, particularly preferably 390 mm or more, and 470 mm from the viewpoint of a feeling of fit especially when matched to the baby's body shape. More preferably, it is more preferably 460 mm or less, more preferably 370 mm or more and 470 mm or less, and particularly preferably 390 mm or more and 460 mm or less.

  Component (3): The peripheral length at the opening periphery of the waist opening WH in the extended state in which the diaper 1 is extended to the maximum in the lateral direction Y is 600 mm or more and 720 mm or less. Here, the “expanded state in which the diaper 1 is unfolded and extended to the maximum in the lateral direction” means that the diaper 1 is separated by the side seal portion S to be in the unfolded state, and the unfolded diaper 1 is stretched in the lateral direction Y. It is a state where it is expanded to the design dimension (same as the dimension when expanded in the lateral direction Y in a state where the influence of the elastic member is completely eliminated). From the viewpoint of further achieving the above effects, the circumference of the waist opening WH is more preferably 620 mm or more, particularly preferably 640 mm or more, and a feeling of fit when worn particularly according to the baby's body shape. In view of the above, it is more preferably 710 mm or less, particularly preferably 700 mm or less, specifically more preferably 620 mm or more and 710 mm or less, and particularly preferably 640 mm or more and 700 mm or less.

The component (4): a pair of inner surfaces of the waist portion WT in the stretched state in which the diaper 1 is loaded with 10N in the lateral direction Y with respect to the length (L1) of the waist portion WT in the natural state of the diaper 1 The ratio (L2 / L1) × 100) of the length (L2) of the inner dimension between the side seal portions S, S is 225% or more. Here, the length (L2) of the inner dimension at the waist part WT in the diaper 1 in the stretched state loaded with 10 N in the lateral direction Y is obtained in the following manner.
Two cylindrical rods with a length of 150 mm and a diameter of 7 mm are prepared. One cylindrical rod is inserted from the waist opening WH of the diaper 1 into one leg opening LH, and the other leg from the waist opening WH of the diaper 1 The remaining one cylindrical rod is inserted into the opening LH. Next, the two upper and lower chucks of a tensile tester (for example, AUTOGRAPH AG-X manufactured by Shimadzu Corporation) are sandwiched between both ends of each inserted cylindrical bar, and two cylindrical bars are sandwiched between the upper and lower pair of chucks. Set the diaper 1 with inserted. Next, the distance between the two centers (the center of the cross section of the cylindrical bar) is set to 90 mm or less. The pair of upper and lower chucks are moved away from each other so that the tensile speed is 300 mm / min, and the diaper 1 is pulled in the lateral direction Y. When the tensile load (maximum load) reaches 10 N, the chuck The movement is stopped, and the length (L2) of the stretched state of the waist portion WT of the stretched diaper 1 fixed between the chucks is measured. The inner dimension length (L2) is obtained by the following equation in consideration of the thickness of the two cylindrical rods. Here, the following formula represents the thickness of two cylindrical rods, that is, two semicircular circumferential lengths of a cylindrical rod having a diameter of 7 mm, 7 × 3.14 × (1/2) × 2 = 21 .98 mm≈22 mm is considered.

Inner length (L2) = Distance between chucks × 2 + 22

From the viewpoint of further achieving the above effects, the length (L2) of the inner dimension at the waist portion WT in the extended diaper 1 is more preferably 205 mm or more, particularly preferably 230 mm or more, and 310 mm. More preferably, it is more preferably 290 mm or less, specifically 205 mm or more and 310 mm or less, and particularly preferably 230 mm or more and 290 mm or less.

  Component (5): Waist WT in a state in which the load is released from an extended state in which the diaper 1 is loaded by 10 N in the lateral direction Y with respect to the length (L1) of the inner size of the waist WT in the natural state of the diaper 1 The ratio (L3 / L1) × 100) of the length (L3) of the inner dimension between the pair of side seal portions S, S on the inner surface is 140% or less. Here, the length (L3) of the inner dimension at the waist portion WT in the diaper 1 in a state in which the load is released from the extended state in which the load is 10 N in the lateral direction Y is obtained in the following manner. After measuring the length (L2) of the inner dimension at the waist portion WT in the stretched diaper 1 subjected to a load of 10 N in the lateral direction Y, it is released and measured in the diaper 1 in a state where 2 minutes have passed after the release. The measurement is performed by measuring the opening periphery of the waist opening WH of the diaper 1 in a released state, the position 15 mm away from the opening periphery of the waist opening WH toward the absorber 23 (absorbent body 2), and the opening periphery of the waist opening WH. The length between the pair of side seal portions S, S is measured at three positions 35 mm away from the absorber 23 (absorbent main body 2) to the inner length of the inner dimension. (L3). From the viewpoint of further exerting the above effects, the inner dimension length (L3) at the waist portion WT in the opened diaper 1 is more preferably 100 mm or more, particularly preferably 110 mm or more, and It is more preferably 170 mm or less, particularly preferably 150 mm or less, specifically more preferably 100 mm or more and 150 mm or less, and particularly preferably 110 mm or more and 170 mm or less.

Component (6): Young's modulus (Y1) at the waist WT is 2.4 × 10 ⁻⁴ N / mm ² or less. Here, the Young's modulus (Y1) of the waist part WT is calculated | required in the following way using the tensile testing machine (For example, AUTOGRAPH AG-X by Shimadzu Corporation).
Two cylindrical rods with a length of 150 mm and a diameter of 7 mm are prepared. The measurement environment temperature is 25 ° C. As a measurement sample, what cut out the form which connected the waist part WT in the ring shape by the side seal part S from the diaper 1 is prepared. As a specific example, from the diaper 1 so that the waist part WT of the form connected in the ring shape by the side seal part S from the opening periphery of the waist opening part WH to the position of 35 mm to the absorber 23 side becomes 35 mm in width. Prepare the cut-out. Two cylindrical rods are inserted into this ring-shaped measurement sample. Next, the pair of upper and lower chucks of the tensile tester are used to hold only both end portions of each inserted cylindrical rod, and a ring-shaped measurement sample in which two cylindrical rods are inserted is set between the pair of upper and lower chucks. . Next, the distance between the centers of the two cylindrical rods (the center of the cross section of the cylindrical rod) is set to 89 mm. And the stress-strain curve at the time of extending | stretching until it becomes 289 mm between the centers of two cylindrical rods with the tension | pulling speed of 300 mm / min is created. Then, from the created stress-strain curve, when the measurement sample is pulled, the load between the centers of the two cylindrical bars is 139 mm (peripheral length is 300 mm), and the distance between the centers of the two cylindrical bars is 239 mm. The Young's modulus is obtained based on the load at the time (perimeter length: 500 mm). Here, between the pair of upper and lower chucks of the tensile tester, the thickness of two cylindrical rods, that is, two semicircular lengths of a cylindrical rod having a diameter of 7 mm, is 7 × 3.14 × (1 / 2) It is set in consideration of x2 = 21.98 mm≈22 mm.
Specifically, the Young's modulus is obtained by the following formula. The measurement is performed three times, and the average value thereof is defined as the Young's modulus (Y1) at the waist portion WT.

Young's modulus = (load at the time of 239 mm between the centers of the two cylindrical rods (perimeter length 500 mm) −load at the time of 139 mm between the centers of the two cylindrical rods (perimeter length 300 mm)) / (200 × 35)

From the viewpoint of further exerting the above-described effect of easily putting the diaper 1 on an infant lying on its back, the waist portion DT of the diaper 1 with respect to the Young's modulus (Y1) at the waist WT. The Young's modulus (Y2) ratio (Y2 / Y1) is preferably 1.5 times or more, more preferably 1.7 times or more, and particularly preferably 1.9 times or more. Here, the Young's modulus (Y2) of the waist portion DT is the same as the following using a tensile tester (for example, AUTOGRAPH AG-X manufactured by Shimadzu Corporation) in the same manner as the Young's modulus (Y1) of the waist portion WT. Is required.
Two cylindrical rods with a length of 150 mm and a diameter of 7 mm are prepared. The measurement environment temperature is 25 ° C. As the measurement sample, a diaper obtained by cutting out the ring-shaped measurement sample for measuring the Young's modulus at the above-described waist portion WT is used, and the side seal is cut from the cutout position of the diaper to a position of 35 mm on the leg opening LH side. A body cut out from the diaper 1 so as to have a width of 35 mm is prepared. Two cylindrical rods are inserted into this 35 mm wide ring-shaped measurement sample. Next, the pair of upper and lower chucks of the tensile tester are used to hold only both end portions of each inserted cylindrical rod, and a ring-shaped measurement sample in which two cylindrical rods are inserted is set between the pair of upper and lower chucks. . Next, the distance between the centers of the two cylindrical rods (the center of the cross section of the cylindrical rod) is set to 89 mm. And the stress-strain curve at the time of pulling until it becomes 289 mm between the centers (center of the cross section of a cylindrical rod) of two cylindrical rods is created with the tension speed of 300 mm / min. Then, from the created stress-strain curve, when the measurement sample is pulled, the load between the centers of the two cylindrical bars is 139 mm (peripheral length is 300 mm), and the distance between the centers of the two cylindrical bars is 239 mm. The Young's modulus is obtained based on the load at the time (perimeter length: 500 mm). Here, between the pair of upper and lower chucks of the tensile tester, the thickness of two cylindrical rods, that is, two semicircular lengths of a cylindrical rod having a diameter of 7 mm, is 7 × 3.14 × (1 / 2) It is set in consideration of x2 = 21.98 mm≈22 mm.
Specifically, the Young's modulus is obtained by the above formula. The measurement is performed three times, and the average value thereof is defined as the Young's modulus (Y2) at the waist portion DT.

From the standpoint of further achieving the above-described effects, the Young's modulus (Y2) at the waist portion DT of the diaper 1 is preferably 2.6 × 10 ⁻⁴ N / mm ² or more, and 3.2 × 10 ^−4. N / mm ² or more is more preferable, 4.9 × 10 ⁻⁴ N / mm ² or less is preferable, and 4.5 × 10 ⁻⁴ N / mm ² or less is more preferable. Specifically, it is preferably 2.6 × 10 ⁻⁴ N / mm ² or more and 4.9 × 10 ⁻⁴ N / mm ² or less, and preferably 3.2 × 10 ⁻⁴ N / mm ² or more and 4.5 ×. More preferably, it is 10 ⁻⁴ N / mm ² or less.

  In addition, from the viewpoint of further exerting the effect of easily putting the diaper 1 on an infant in a state of lying on its back, the diaper 1 is unfolded and extended in the longitudinal direction X to the maximum ( The position M1 of the minimum crotch width in the crotch region B of the exterior body 3 in FIG. 2) is a ventral region from the horizontal bisector CLx that bisects the diaper 1 in the vertical direction X and extends in the horizontal direction Y. It is preferable that it is arranged on the A side. Preferably, the minimum crotch width at the position M1 of the crotch region B of the exterior body 3 is preferably 140 mm or more, more preferably 150 mm or more, and particularly a fit feeling when worn according to the baby's body shape In view of the above, it is preferably 190 mm or less, more preferably 180 mm or less, specifically 140 mm or more and 190 mm or less, and more preferably 150 mm or more and 180 mm or less.

  Moreover, the leg opening in the expansion | extension state which extended the leg opening part LH of the diaper 1 to the maximum from the viewpoint of having the effect that it is easy to put on the diaper 1 with respect to the infant of the state which laid down on the back mentioned above easily. The peripheral length on the inner peripheral surface of the portion LH is preferably 270 mm or more, more preferably 290 mm or more, and particularly 350 mm or less from the viewpoint of fit when worn according to the baby's body shape. Is preferably 330 mm or less, specifically 270 mm or more and 350 mm or less, and more preferably 290 mm or more and 330 mm or less. Here, “the extended state in which the leg opening LH is extended to the maximum” of the diaper 1 is against the elastic stress of the leg elastic member 33 disposed on the leg peripheral part LS of the leg opening LH of the diaper 1. It means a state where the leg opening LH is extended to the maximum to the design dimension (same as the dimension when the leg opening LH is expanded without any influence of the elastic member).

In addition, from the viewpoint of further exerting the above-described effect of easily putting the diaper 1 on an infant lying on its back, the elastic member 33 for forming leg gathers formed in the leg opening LH of the diaper 1. Is preferably arranged at an expansion ratio of 1.8 times or more, more preferably 1.9 times or more, and preferably 2.4 times or less, More preferably, it is arranged at 2.2 times or less, specifically, it is preferably arranged at 1.8 times or more and 2.4 times or less, preferably 1.9 times or more and 2.2 times or less. More preferably, it is arranged. The expansion ratio of the elastic member 33 for leg gather formation can be measured as follows, for example. When the length of the elastic member 33 of the diaper 1 is 33A and the length of the elastic member 33 taken out from the diaper 1 is 33a, it is obtained by the following equation.

Elongation magnification = 33A / 33a

Further, from the viewpoint of further exerting the effect of easily putting the diaper 1 on an infant lying on its back, the waistline elasticity of the waist part WT including the waist opening WH of the diaper 1 is provided. The members 34 are preferably arranged with an expansion ratio of 2.2 times or more, more preferably 2.4 times or more, and more preferably 3.2 times or less. Preferably, it is more preferably arranged at 2.9 times or less, specifically, preferably arranged at 2.2 times or more and 3.2 times or less, preferably 2.4 times or more and 2.9 times. More preferably it is arranged below. The waistline elastic member 34 formed in the waistline portion DT of the diaper 1 is preferably arranged with an expansion ratio of 2.3 times or more, more preferably 2.5 times or more. It is preferably arranged at 3.3 times or less, more preferably at 3.1 times or less, specifically, 2.3 times or more and 3.3 times or less. It is more preferable that it is arranged at 2.5 times or more and 3.1 times or less. The expansion ratio of the waistline elastic member 34 can be measured, for example, as follows. When the length of the elastic member 34 around the waist of the diaper 1 is 34A and the length of the elastic member 34 taken out from the diaper 1 is 34a, the following equation is obtained.

Elongation magnification = 34A / 34a

  Further, from the viewpoint of further exerting the above-described effect that it is easy to put the diaper 1 on an infant lying on its back, the absorption of the diaper 1 in the expanded and extended plan view as shown in FIG. The width (length in the lateral direction Y) at the end on the ventral region A side and the end on the back region C side in the longitudinal direction X of the body 23 is preferably 80 mm or more, and preferably 90 mm or more. More preferably, it is preferably 150 mm or less, more preferably 135 mm or less, specifically preferably 80 mm or more and 150 mm or less, and more preferably 90 mm or more and 135 mm or less.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, the underpants type disposable diaper of this invention is not restrict | limited to the diaper 1 of the said embodiment at all, and can be suitably changed in the range which does not deviate from the meaning of this invention. It is.

  For example, in the diaper 1 of the above-described embodiment, as illustrated in FIG. 2, the outer layer sheet 31 of the exterior body 3 has a portion that extends outward from both end edges in the longitudinal direction X of the inner layer sheet 32. The folded portion 310 formed by folding the extending portion covers the end in the longitudinal direction X of the absorbent main body 2 (absorber 23), but does not have the folded portion 310. Alternatively, the outer layer sheet 31 may be separate from the outer layer sheet 31 to cover the end in the longitudinal direction X of the absorbent main body 2 (absorber 23).

DESCRIPTION OF SYMBOLS 1 Pants type disposable diaper A Abdominal side area B Inseam area C Back side area S Side seal part WH Waist opening part WT Waist part DT Trunk circumference part LH Leg opening part LS Leg peripheral part F Front body R Rear body 2 Absorbent body 21 Top sheet 22 Back sheet 23 Absorber 3 Exterior body (main part forming outer shape of diaper)
31 Outer layer sheet 310 Folded part 32 Inner layer sheet 33 Leg elastic member 34 waist elastic member X longitudinal direction Y lateral direction

Claims (8)

A stretchable exterior body having a longitudinal direction corresponding to the longitudinal direction of the wearer and a lateral direction perpendicular thereto, and an absorbent main body having a liquid-retaining absorbent body fixed to the inside of the exterior body The outer body is provided with an abdominal region disposed on the abdomen side of the wearer when worn, a dorsal region disposed on the dorsal side of the wearer when worn, a crotch region between the abdominal region and the dorsal region. The side edges of each of the ventral region and the dorsal region are joined to form a pair of side seal portions, and a waist opening and a pair of leg openings are formed. A pants-type disposable diaper,
The length (L1) of the inner dimension between the pair of side seal parts on the inner surface of the waist part including the waist opening part in the natural state of the pants-type disposable diaper is 90 mm or more and 150 mm or less,
The pants-type disposable diaper is unfolded and extended in the longitudinal direction to the maximum length in the longitudinal direction is 350 mm or more and 480 mm or less,
The perimeter at the opening periphery of the waist opening in the extended state in which the pants-type disposable diaper is extended to the maximum in the lateral direction is 600 mm or more and 720 mm or less,
Between the pair of side seal portions on the inner surface of the waist portion in the stretched state in which the pants-type disposable diaper is loaded 10 N in the lateral direction with respect to the length (L1) of the inner size of the waist portion in the natural state The ratio of the length (L2) of the inner dimension ((L2 / L1) × 100) is 225% or more,
A pair of the inner surfaces of the waist portion in the state in which the load is released from the stretched state in which the pants-type disposable diaper is loaded by 10 N in the lateral direction with respect to the length (L1) of the inner dimension of the waist portion in the natural state The ratio of the length (L3) of the inner dimension between the side seal portions ((L3 / L1) × 100) is 140% or less,
A pants-type disposable diaper whose Young's modulus (Y1) at the waist is 2.4 × 10 ⁻⁴ N / mm ² or less.   The pants according to claim 1, wherein a ratio (Y2 / Y1) of a Young's modulus (Y2) in a waist portion of the pants-type disposable diaper to a Young's modulus (Y1) in the waist portion is 1.5 times or more. Type disposable diaper. The Young's modulus (Y2) at the waist part of the pants-type disposable diaper is 2.6 × 10 ⁻⁴ N / mm ² or more and 4.9 × 10 ⁻⁴ N / mm ² or less. Pants-type disposable diapers.   The position of the minimum crotch width in the crotch region of the exterior body in the stretched state where the pant-type disposable diaper is expanded and stretched to the maximum in the vertical direction, bisects the pant-type disposable diaper in the vertical direction The pants-type disposable diaper according to any one of claims 1 to 3, wherein the pants-type disposable diaper is arranged on the ventral region side with respect to a horizontal bisector extending in a horizontal direction.   The minimum crotch width in the crotch region of the exterior body in the extended state in which the pants-type disposable diaper is expanded and extended in the vertical direction to the maximum is 140 mm or more and 190 mm or less. The pants-type disposable diaper described in 1.   The circumference length in the inner peripheral surface of the said leg opening in the expansion | extension state which extended the said leg opening of the said underpants type disposable diaper to the maximum is 270 mm or more and 350 mm or less, The any one of Claims 1-5. Pants-type disposable diapers.   The elastic member for forming leg gathers arranged in the leg opening is arranged with an expansion ratio of 1.8 times or more and 2.4 times or less. Pants-type disposable diaper.   The pants-type disposable according to any one of claims 1 to 7, wherein a width at an end portion on the ventral region side and an end portion on the dorsal region side in the longitudinal direction of the absorber is 80 mm or more and 150 mm or less. Diapers.

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