JP6195724B2 - Disposable pants-type diapers - Google Patents

Description

  The present invention relates to a disposable pants-type diaper, and more particularly to the diaper suitable for being worn by an elderly person.

  A disposable pants-type diaper, in which a front body and a back body that overlap each other on both sides of the diaper are joined together to form a joint area, is known and well known.

  The pants described in Japanese Patent Laid-Open No. 4-371147 (Patent Document 1) is an example thereof, and is used as a training pants for infants or a pants-type diaper. A plurality of elastic members are attached to a given region of the front body and the back body of the pants, and the tensile stress in the lateral direction of the given region of the front body is in the lateral direction of the given region of the back body. It is larger than the elongation stress.

  The pants-type absorbent article described in JP-A-9-38134 (Patent Document 2) is also an example. This absorbent article can be used as a disposable pants-type diaper or training pants. In this document, since the rear side of the diaper is less related to “slipping” than the front side, the extension stress of the auxiliary elastic member in the rear side is It is described that the inventor has found that it is not necessary to have the same degree as that of the auxiliary elastic member in the portion.

JP-A-4-371147 JP-A-9-38134

  Conventional pants and pants-type absorbent articles have a body fluid-absorbing core material extending from the front body to the back body through the crotch region, and the core material is a liquid-permeable surface. It is sandwiched between the sheet and the liquid-impermeable back sheet. The elastic member in the given region of the front body and the back body and the auxiliary elastic member in the front side part and the rear side part are interposed between the top sheet and the back sheet and extend in the lateral direction so as to cross the core material. ing. When these pants or pants-type absorbent articles are worn, such elastic members and auxiliary elastic members mainly extend or contract only at the portion located outside in the lateral direction of the core material. The junction area between the front body and the back body extending substantially vertically in the vertical direction does not distort from the back body to the front body, or even if distorted, the amount of distortion is small. However, when such a shape of the pants or the pants-type absorbent article is applied as it is to a pants-type diaper for adults, particularly a pants-type diaper for elderly people, the joint area will extend in the vertical direction on the side of the body. When the wearer is lying down for a long time, the joint area may irritate the skin.

  This invention makes it a subject to provide the disposable pants-type diaper which makes it possible to prevent generation | occurrence | production of such a problem.

In order to solve the above-described problems, the present invention is directed to a front waistline region, a back waistline region, and a crotch region by a front panel, a rear panel, and a crotch panel having a lateral direction, a vertical direction, and a front-rear direction that are orthogonal to each other. And the front panel and the rear panel are capable of elastic expansion and contraction in the lateral direction, and both sides in the lateral direction are overlapped in the shape of a palm. Forming a front and rear waistline region having an inner surface and an outer surface, and forming a joining region extending linearly in the vertical direction, the crotch panel overlapping the outer surface of the front panel and the outer surface of the rear panel A disposable pants-type diaper having an overlapping rear end.

The features of the present invention in this diaper are as follows. That is, the front panel and the rear panel have the same lateral dimensions, and a plurality of elastic members extend in a stretched state to the both side portions, and the front end portion. And the rear end portion, the one in which the position in the vertical direction is above the reference end portion, and the front first elastic region in which the front panel is located above the reference end portion; A rear first elastic region having a front second elastic region located below the front first elastic region, and wherein the rear panel is located above the reference end, and the rear first elastic region. And a rear second elastic region located below. The front first elastic region, the front second elastic region , the rear first elastic region, and the rear second elastic region cause an extension force of 0.01 N to act in the lateral direction per 1 mm in the vertical direction. In this case, the front first elastic region and the rear first elastic region have the same expansion ratio, and the rear second elastic region has a higher expansion ratio than the front second elastic region .

In one embodiment of the present invention, each of the front end portion and the rear end portion of the crotch panel is formed on the outer surface at the edge portion extending in the lateral direction and the side edge portions extending in the vertical direction. On the other hand, the central portion located between the both side edge portions is not joined to the outer surface except for the end edge portion.

  In another embodiment of the present invention, the extension ratio of the front second elastic region is larger than the extension ratio of the front first elastic region.

  In another embodiment of the present invention, the extension ratio of the rear second elastic region does not exceed the extension ratio of the rear first elastic region.

According to still another embodiment of the invention, extension magnification of the elastic member in the forward second elastic region is higher than the extension magnification of the elastic member in the rear second elastic region.

The disposable pants-type diaper according to the present invention has the same elongation ratio of the front first elastic region in the front panel and the rear first elastic region in the rear panel. The front edge and the rear edge of the waistline opening can be expanded in the same way, making it easy to put the leg into the diaper. The peripheral edges can be pulled up in the same way when pulled up easily. After the diaper is pulled up, the front first elastic region and the rear first elastic region are not elastically stretched or contracted in the same way, and only the wearer's abdomen is not compressed. Further, the rear since elongation ratio of the second elastic region is greater than the elongation percentage of the second elastic zone forward, the bonding region formed in respective sides of the diaper, toward the upper side to the lower side, the vertical front panel Deform to approach the center line of the direction. When the joint area of the diaper being worn is deformed in this way, the skin of the wearer is not stimulated by the joint area, regardless of whether the wearer is in a supine or lying position.

The partial fracture | rupture perspective view for mainly showing a front panel of the disposable pants-type diaper in the wearing condition. The partial fracture | rupture perspective view for mainly showing a rear panel of the disposable pants-type diaper in the wearing condition. The figure which expands and shows a partially broken diaper of FIG. The figure similar to FIG. 3 which shows an example of an embodiment. The figure which shows the preparation procedure of the test piece for an extension force measurement by (a)-(d). The figure which shows typically the relationship between the expansion force and expansion | extension ratio about a front 2nd elastic region and a back 2nd elastic region.

  The details of the disposable pants-type diaper according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a partially cutaway perspective view of a disposable diaper 10 in a state worn by an adult wearer 100 whose part is shown by phantom lines. The diaper 10 is located in front of the front-rear direction Z and forms the front waistline region 2, the rear panel 13 located rearward of the front-rear direction Z and forms the rear waistline region 3, and a U-shape And a crotch panel 14 that forms a crotch region 4 that is bent so as to extend in the front-rear direction Z.

  The front panel 12 and the rear panel 13 have side portions 16 and 17 overlapping each other on both sides in the lateral direction X, and welded to each other at a plurality of portions 18 to form a joint region 19 extending in the vertical direction Y in the figure. ing. The front panel 12 and the rear panel 13 have inner surfaces 22 and 23 that contact the skin of the wearer 100 and outer surfaces 24 and 25 that are surfaces opposite to the inner surfaces 22 and 23. As shown in the figure, a waistline region 20 is formed which can be annular, and the waistline region 20 has a waistline opening 30 formed therein. The crotch panel 14 includes a front end portion 26, a rear end portion 27 (see FIG. 2), and an intermediate portion 28. The front end portion 26 overlaps the outer surface 24 of the front panel 12, and the rear end portion 27 is the rear panel 13. It overlaps with the outer surface 25. The intermediate portion 28 extends between the front panel 12 and the rear panel 13, and forms leg openings 29 on both sides of the diaper 10 in cooperation with the front and rear panels 12 and 13.

  In the diaper 10, the crotch panel 14 has an inner surface 34 and an outer surface 35, and the front end portion 26 of the crotch panel 14 is on the inner surface 34 of the front end edge portion 31 extending in the lateral direction X and on both sides in the lateral direction X. It joins with the outer surface 24 of the front panel 12 via the hot-melt-adhesive HA2 in the outer surface 35 of the both-sides edge part 32 extended to the up-down direction Y. Each of the side edge portions 32 is a portion where the crotch panel 14 is folded over the inner surface 34 of the crotch panel 14 at both side portions as described later. The outer surface 35 of such a side edge portion 32 faces the outer surface 24 of the front panel 12. A thread-like or belt-like elastic member 36 is attached to each of the side edge portions 32 in an extended state. Each of the front panel 12 and the rear panel 13 includes an inner surface sheet 41 and an outer surface sheet 43, and an inner surface sheet 42 and an outer surface sheet 44, which are bonded to each other via a hot melt adhesive (not shown). A plurality of thread-like or belt-like elastic members 45 are interposed between the inner surface sheet 41 and the outer surface sheet 43, and are stretched through a hot melt adhesive (not shown) with respect to at least one sheet 41 or 43. It is joined with. A plurality of thread-like or belt-like elastic members 46 are interposed between the inner surface sheet 42 and the outer surface sheet 44, and are in an extended state with respect to at least one sheet 42 or 44 via a hot melt adhesive (not shown). It is joined with.

  The front panel 12 and the rear panel 13 formed in this way can be repeatedly stretched and contracted elastically in the lateral direction X of the diaper 10, in other words, in the waist direction of the diaper 10. In the up-down direction Y of FIG. 1, the front panel 12 is below the front first elastic region 51 and the front first elastic region 51, which are portions located above the front end portion 26 of the crotch panel 14. It is divided into a front second elastic region 52, which is a portion that is located. The front first elastic region 51 includes an upper elastic member 45 a of the elastic member 45, and the front second elastic region 52 includes a lower elastic member 45 b of the elastic member 45. Above the uppermost elastic member 47a of the upper elastic member 45a, a top edge portion 60a that includes the inner surface sheet 41 and the outer surface sheet 43 and does not include the elastic member 45 is formed. The part 60 a is a part that is not included in the front first elastic region 51. Further, below the lowermost elastic member 47b of the lower elastic member 45b, a bottom edge 60b that includes the inner surface sheet 41 and the outer surface sheet 43 and does not include the elastic member 45 is formed. The bottom edge portion 60 b is a portion that is not included in the front second elastic region 52. In the front panel 12, when the elastic member 45 contracts, frills are formed on the top edge 60a and the bottom edge 60b. However, in this invention, the diaper 10 may be one in which the top edge 60a and / or the bottom edge 60b is not formed.

  2 is a partially broken perspective view of the diaper 10 for showing the rear panel 13 and the rear end portion 27 of the crotch panel 14 in the diaper 10 of FIG. The rear end portion 27 of the crotch panel 14 has an inner surface 34 at the rear end edge portion 61 extending in the lateral direction X and an outer surface 35 at the side edge portions 32 extending in the vertical direction Y serving as the hot melt adhesive HA2 (see FIG. 3). To the outer surface 25 of the rear panel 13. However, the outer surfaces 35 of the side edge portions 32 face the rear panel 13. A plurality of elastic members 46 are interposed between the inner sheet 42 and the outer sheet 44 in the rear panel 13 so that the rear panel 13 can repeat elastic expansion and contraction in the lateral direction X. is there. The rear panel 13 is a rear first elastic region 71 which is a portion located above the rear end portion 27 in the crotch panel 14 and a rear first portion which is a portion located below the first rear elastic region 71. It is divided into two elastic regions 72. The rear first elastic region 71 includes an upper elastic member 46 a of the elastic member 46, and the rear second elastic region 72 includes a lower elastic member 46 b of the elastic member 46. A top edge portion 70a that includes the inner surface sheet 42 and the outer surface sheet 44 and does not include the elastic member 46 is formed above the uppermost elastic member 48a of the upper elastic member 46a. 70 a is a portion that is not included in the rear first elastic region 71. In addition, a bottom edge 70b that includes the inner surface sheet 42 and the outer surface sheet 44 and does not include the elastic member 46 is formed below the lowermost elastic member 48b of the lower elastic member 46b. The edge portion 70 b is a portion that is not included in the rear second elastic region 72. In the rear panel 13, when the elastic member 46 contracts, frills are formed on the top edge 70a and the bottom edge 70b. In the up-down direction Y of the diaper 10, the rear end portion 27 of the crotch panel 14 is in the same position as the front end portion 26, and the dimensions of the rear first elastic region 71 and the rear second elastic region 72 are the front first elastic region 51. And the dimensions of the front second elastic region 52 are the same. In the present invention, the diaper 10 may be one in which the top edge portion 70a and / or the bottom edge portion 70b are not formed.

  3 shows that the front panel 12 and the rear panel 13 are unbonded at the joint region 19 in the diaper 10 of FIG. 1, and the panels 12 and 13 and the crotch panel 14 are moved in the lateral direction X and the front-rear direction Z. It is a partial fracture top view of extension diaper 110 obtained by extension. A line PP in the figure is a longitudinal center line that bisects the dimension in the lateral direction X in the diaper 10 and the extended diaper 110, and the line QQ is the dimension in the longitudinal direction Z in the extended diaper 110. The horizontal center line is equally divided. The extended diaper 110 is formed symmetrically with respect to the longitudinal center line PP, but may be formed symmetrically or asymmetrically with respect to the lateral centerline QQ. The extension diaper 110 in the illustrated example is an example in the case where the diaper 110 is formed symmetrically with respect to the lateral center line QQ. In the extended diaper 110, the elastic members 45 and 46 and the elastic member 36 are laterally X or front and back to the extent that gathers disappear from the nonwoven fabric such as the inner surface sheet 41 and the outer surface sheet 43 at the portion where they overlap and are joined. In an extended state in the direction Z.

  In FIG. 3, the front panel 12 and the rear panel 13 are rectangular panels having the same size, the dimension A in the lateral direction X is the same as each other, and the dimension B in the front-rear direction Z is also the same. In the front-rear direction Z, they are separated by a dimension D. The dimension A is an inner dimension between the joint areas 19 and 19. The front panel 12 is formed by joining an inner sheet 41 and an outer sheet 43, which are nonwoven fabrics such as spunbond nonwoven fabric formed of thermoplastic synthetic fibers, via a hot melt adhesive (not shown). The elastic member 45 interposed between the inner sheet 41 and the outer sheet 43 extends so as to reach both side portions 16 and 16 of the front panel 12. The rear panel 13 is also formed by joining an inner sheet 42 and an outer sheet 44 which are non-woven fabrics. The elastic member 46 interposed between the inner sheet 42 and the outer sheet 44 extends so as to reach both side portions 17 and 17.

  In the crotch panel 14, a body fluid-absorbing core 37 is interposed between an inner surface sheet 34a and an outer surface sheet 35a formed of a nonwoven fabric such as a spunbond-meltblown-spunbond nonwoven fabric or a spunbond nonwoven fabric. A waterproof sheet 38 made of a liquid-impermeable plastic film is interposed between the core 37 and the outer sheet 35a. The inner surface sheet 34a and the outer surface sheet 35a are bonded to the core 37 and the waterproof sheet 38 facing each other via a hot melt adhesive (not shown), and at the portion extending from the peripheral edge of the core 37, They are joined to each other via the melt adhesive HA1. The inner sheet 34a and the outer sheet 35a joined in this way form side edge portions 32 extending in the front-rear direction Z on both sides of the crotch panel 14, but in the diaper 10 and the extended diaper 110 in the illustrated example. The side edge portion 32 is bent at a side edge line 39 parallel to the line PP so that the inner surface sheet 34a is on the inner side. A central portion 40 is formed between the side edge portions 32 and 32 facing each other in the lateral direction X, and an inner surface sheet 34 a in the side edge portion 32 and an inner surface sheet 34 a in the central portion 40 are front end edges of the crotch panel 14. The part 31 and the rear edge part 61 are joined via a hot-melt adhesive HA4. The outer surface sheet 35a in the side edge portion 32 is joined to the outer surface sheets 43 and 44 of the front and rear panels 12 and 13 through the hot melt adhesive HA2 in a portion overlapping the front panel 12 and the rear panel 13. . In the side edge portion 32, the inner elastic member 36 a and the outer elastic member 36 b forming the elastic member 36 interposed between the inner sheet 34 a and the outer sheet 35 a reach the front panel 12 and the rear panel 13. Thus, it is extended in the front-rear direction Z. When the diaper 10 is in the state shown in FIG. 1, the elastic members 36 a and 36 b contract, and the inner elastic member 36 a contracts, so that the side edge portion 32 functions as a leakage barrier in the crotch region 4. (See FIG. 1). In the side edge portion 32, a portion where the inner elastic member 36a exists is a distal edge in the leakage barrier, and a portion where the outer elastic member 36b exists is a proximal edge in the leakage barrier. The front end edge portion 31 of the front end portion 26 of the crotch panel 14 and the rear end edge portion 61 of the rear end portion 27 are joined to the front panel 12 and the rear panel 13 via the hot melt adhesive HA2. Yes. The front end portion 26 and the rear end portion 27 are not joined to the front panel 12 and the rear panel 13 in a portion other than the portion shown in the drawing, but between the front panel 12 and the rear panel 13. Pockets 81 and 82 are formed which open downward in the vertical direction Y (see FIG. 1), in other words, toward the lateral center line QQ in FIG. In these pockets 81 and 82, both end portions of a urine absorbing pad (not shown) when used together with the diaper 10 can be inserted.

  In the illustrated front panel 12 and rear panel 13, the front first elastic region 51 and the rear first elastic region 71 have the same dimension C in the front-rear direction Z of FIG. The dimension C is the distance from the front end 26 to the uppermost elastic member 47a (including the uppermost elastic member 47a) in the front panel 12, and the rear end 27 in the rear panel 13. To the uppermost elastic member 48a (including the uppermost elastic member 48a). In the front first elastic region 51 and the rear first elastic region 71, as the upper elastic members 45a and 46a, a plurality of spandex having the same composition and thickness and the same expansion ratio are used. In the periphery of the waist opening 30 of the diaper 10, when the diaper 10 is worn, the periphery of the front panel 12 and the rear panel 13 is expanded or contracted in the same manner. In a preferred diaper 10, spandex 470-940 dtex is used at a stretch ratio of 1.8-2.8. When trying to put a leg in the waistline opening 30 formed in that way, even if the toe touches the peripheral edge of the front panel 12 or the peripheral edge of the rear panel 13, these peripheral edges are the same. So that it does not become a hindrance when trying to easily deform and put a leg. Moreover, when the diaper 10 is for elderly people, when wearing it, the front 1st elastic region 51 and the back 1st elastic region 71 are the left and right iliac (not shown) of the wearer 100. If the dimension B and the dimension D (see FIG. 3) are determined so that they can be positioned above, the anterior first elastic region 51 and / or the posterior first elastic region 71 are hooked on the iliac bone from above the body. The sliding of the worn diaper 10 can be prevented. In the front first elastic region 51 and the rear first elastic region 71 that can act as such, there is no need to strongly tighten the wearer's waist by the upper elastic members 45a and 46a, and the abdomen is not compressed, The diaper 10 is easy to wear for the elderly and has a good wearing feeling.

Between the front second elastic region 52 of the front panel 12 and the rear second elastic region 72 of the rear panel 13, an extension force of 0.01 N per 1 mm in the front-rear direction Z of FIG. The specimen 125 for the front second elastic region 52 and the specimen 126 for the rear second elastic region 72, which are made by the procedure, are applied to the elastic member 45 or the elastic member 46 in a contracted state. The lower elastic members 45b and 46b are selectively used so that the extension ratio of the rear second elastic region 72 in the lateral direction X is larger than the extension ratio of the front second elastic region 52 in the horizontal direction X. The term “elongation ratio” as used herein refers to the ratio of the length after extension to the full length L ₀ described later for the front second elastic region 52 and the rear second elastic region 72. For example, in FIG. 3, the lower elastic members 45b and 46b have the same composition and thickness and are in the same position in the vertical direction Y of FIG. 1, but the expansion ratio of the lower elastic member 45b is the extension of the lower elastic member 46b. The lower elastic member 45b is extended and attached to the front panel 12 so as to be higher than the magnification. As a result, when a constant extension force, for example, a constant extension force in the lateral direction X with respect to a dimension of 1 mm in the front-rear direction Z is applied to the diaper 10 in which the elastic members 45 and 46 are contracted, the rear first The extension amount of the second elastic region 72 is larger than the extension amount of the front second elastic region 52 . When the diaper 10 is worn, the front second elastic region 52 of the front panel 12 in such a state is a portion that is less likely to extend than the rear second elastic region 72 of the rear panel 13. On the other hand, the rear second elastic region 72 of the rear panel 13 is a portion that is easily extended, and is pulled in the waistline direction by the front panel 12 and can extend longer than the front panel 12 in the waistline direction. Easily fits the wearer's buttocks. The rear second elastic region 72 can elastically extend in the lateral direction X because the part located outside the crotch panel 14 in the lateral direction X and the part facing the central part 40 of the crotch panel 14, that is, a pocket It is a part inside. Although depending on the size of the waist circumference and the body shape of the wearer 100, the rear second elastic region 72 is pulled and extended over a wide range in the lateral direction X in this manner, whereby in FIG. In the diaper 10 of FIG. 1, the side portions 16 and 17 extending in parallel with the side are pulled forward from the side of the diaper 10 so as to approach the longitudinal center line PP of FIG. The joining area 19 formed by the portions 16 and 17 can be bent as illustrated. In the diaper 10 in this state, most of the side portions 16 and 17 that overlap in a palm-like manner and protrude toward the outside of the diaper 10, that is, most of the protruding joining area 19 is located on the stomach side of the wearer. Therefore, even when the wearer is in a lying position or a supine position, the skin is not compressed and stimulated by the joint area 19. In the front second elastic region 52 capable of acting in this manner, for example, 470-940 dtex spandex is used as the lower elastic member 45b at an expansion ratio of 2.2-3.2 times. As the lower elastic member 46b, for example, a spandex of 470-940 dtex has an expansion ratio of 1.6 to 2.6 times, and is used at an expansion ratio lower than that of the lower elastic member 45b. In the front panel 12, the expansion ratio of the lower elastic member 45b is set higher than the expansion ratio of the upper elastic member 45a, and the front second elastic region 52 and the rear second elastic are caused by the contraction action of the lower elastic member 45b. One of the areas 72 can be indirectly pressed against the iliac crest or greater trochanter of the diaper wearer to prevent the worn diaper 10 from sliding down.

  That is, in the diaper 10, the front first elastic region 51 and the rear first elastic region 71 are easily extended so as not to press the abdomen of the wearer 100 and positioned above the iliac bone. The sliding of the diaper 10 can be prevented. Further, the diaper 10 is prevented from sliding down by the anterior second elastic region 52 and the posterior second elastic region 72 being located at the lower abdomen level of the wearer 100 and being indirectly pressed against the iliac crest or greater trochanter. be able to. In order to increase the force when the anterior second elastic region 52 and the posterior second elastic region 72 are pressed against the iliac crest or the like, it is preferable to set the expansion ratio of the lower elastic member 45b high.

  FIG. 4 is a view similar to FIG. 3 showing an example of the embodiment. In the illustrated extended diaper 110, the same front panel 12 as FIG. 3 is used as the front panel 12, and the crotch panel 14 is joined to the front panel 12 in the same manner as FIG. The front panel 12 and the rear panel 13 are separated by a dimension D as in the case of FIG. However, the joining mode of the rear panel 13 and the crotch panel 14 to the rear panel 13 is different from that of FIG.

  In FIG. 4, the rear panel 13 has the same dimension B as the dimension of the front panel 12 in the front-rear direction Z, but the rear first elastic region 71 of the rear panel 13 has a dimension E, which is shown in FIG. 3 is smaller than the dimension C of the front first elastic region 51 in FIG. For reference, the dimension C is shown relative to the front panel 12 of FIG. The pant-type diaper 10 obtained from the extended diaper 110 is very similar to the pant-type diaper 10 of FIG. 1, but the rear end 27 of the crotch panel 14 is the front end 26 in the vertical direction Y of FIG. It is located above. Thus, in the diaper 10 in which the positions of the front end portion 26 and the rear end portion 27 in the vertical direction Y are different, the front first elastic region 51 and the rear first elastic region 71 in the front panel 12 and the rear panel 13 are used. Are defined as follows. That is, the front first elastic region 51 and the rear first elastic region 71 have the front end portion 26 and the rear end portion 27 of the crotch panel 14 positioned above as the reference end portion, and the front end portion 26. And the rear end portion 27 means a portion above the reference end portion. According to this definition, in the diaper 10 obtained from the extended diaper 110 of FIG. 4, the front panel 12 and the rear panel 13 have a portion having a dimension E in the vertical direction above the rear end portion 27 in the front direction. One elastic region 51 and a rear first elastic region 71 are formed. In FIG. 4, the front first elastic region 51 and the rear first elastic region 71 are indicated by phantom lines. A front second elastic region 52 is formed below the front first elastic region 51, and a rear second elastic region 72 is formed below the rear first elastic region 71. Between the front panel 12 and the rear panel 13 according to the present invention, the number, thickness, expansion ratio, and arrangement state of the elastic members may or may not be the same. The relationship between the extension ratio between the front first elastic region 51 and the rear first elastic region 71 and the relationship between the extension ratio between the front second elastic region 52 and the rear second elastic region 72 defined on the basis of FIG. Those elastic members are used so that the same elongation ratio relationship as in the case of the diaper 10 can be maintained. Incidentally, in the diaper 10 of FIG. 1, the front end portion 26 and the rear end portion 27 of the crotch panel 14 have the same position in the vertical direction Y, and therefore can both be reference end portions.

  FIG. 5 shows the relationship between the extension force and the extension ratio between the front first elastic region 51 and the rear first elastic region 71 and the extension force and the extension rate between the front second elastic region 52 and the rear second elastic region 72. It is a figure for demonstrating the procedure for knowing a relationship. The procedure is as follows.

  1. Two diapers 10 obtained from the extended diaper 110 of FIG. 4 are prepared.

  2. In each diaper 10, the crotch panel 14 is cut with scissors 150 along the lower end edge 12 a of the front panel 12 and the lower end edge 13 a of the rear panel 13, leaving the front end portion 26 and the rear end portion 27 of the crotch panel 14. The crotch panel 14 is separated from the front and rear panels 12 and 13 (see FIG. 5A).

  3. Using the scissors 150, the top edge portions 60a and 70a and the bottom edge portions 60b and 70b are cut off, and the front first elastic region 51 and the rear first elastic region 71 are joined from the front panel 12 and the rear panel 13. The two first rings 121 integrated with each other at 19, and the two second rings 122 formed by integrating the front second elastic region 52 and the rear second elastic region 72 at the joining region 19 are formed (FIG. 5). (See (b)).

  4. In one of the two first rings 121, the rear first elastic region 71 is cut off along the joining region 19 to make a specimen 123 for the front first elastic region 51. In the other of the first rings 121, the front first elastic region 51 is cut off along the joining region 19 to make a specimen 124 for the rear first elastic region 71. In the other one of the first rings 121, the first elastic region 51 is cut off along the joining region 19 to make a specimen 124 for the rear first elastic region 71.

  5. In one of the two second rings 122, the rear second elastic region 72 is cut off along the joining region 19 to make a specimen 125 for the front second elastic region 52. On the other side of the second ring 122, the front second elastic region 52 is cut off along the joining region 19 to make a specimen 126 for the rear second elastic region 72.

6). For each of the specimens 123-126, while paying attention to the gathers formed on the nonwoven fabric along the portion where the nonwoven fabric and the elastic member overlap, pull the specimens to the extent that the gathers disappear and extend The inner dimension between the joining areas 19 and 19 is measured in mm, and the obtained dimension is taken as the total length L ₀ for each specimen. Also, for each coupon 123-126, the dimensions (vertical direction Y in FIG. 1) width direction when you have extended up to the full length _{L 0} is measured in mm, the resulting dimensions specimen 123-126 Let the total width W ₀ be. The total width W ₀ is the dimension in the vertical direction Y when the diaper 10 is in the extended state, that is, the front first elastic region 51, the front second elastic region 52, the rear first elastic region 71, the rear first elastic region in the extended diaper 110. 2 The dimension in the front-rear direction Z of the elastic region 72. Incidentally, in the illustrated example, the total width W ₀ of the front first elastic region 51 and the rear first elastic zone 71 is the same, the total width W ₀ of the front second elastic region 52 and the rear second elastic zone 72 is the same However, in the diaper 10, for example, when the position in the vertical direction Y is different between the lowermost elastic member 48 a and the lowermost elastic member 48 b, the full width W between the front second elastic region 52 and the rear second elastic region 72. The value of ₀ may be different.

7). For each of the specimens 123 to 126 when the elastic members 45 and 46 are in the contracted state, the joining area 19 is gripped with a chuck of a tensile tester (Model No. 3380 manufactured by INSTRON or equivalent), and 300 mm / min. Change of extension force (extension force per 1 mm of full width W ₀ , N / mm) and maximum extension force (N) are obtained at a pulling speed of 10 mm to a length corresponding to 70% of the total length L ₀ . The maximum extension force is referred to as 70% extension force for the front first elastic region 51, the front second elastic region 52, the rear first elastic region 71, and the rear second elastic region 72.

Forward the first elastic zone 51, when comparing the front second elastic zone 52, extension rate and extension of the rear first elastic zone 71 and the rear second elastic region 72 (length), for specimens having a total width W ₀ extension force per width 1mm to compare with a stretch ratio when a 0.01 N (elongation percentage in% of the total length _{L 0)} of the. In the diaper 10, the extension rate of the front first elastic region 51 and the extension rate of the rear first elastic region 71 are the same, and the extension rate of the rear second elastic region 72 is higher than the extension rate of the front second elastic region 52. It ’s a big one. In a more preferable diaper 10, the extension rate of the front second elastic region 52 is larger than the extension rate of the front first elastic region 51, and the extension rate of the rear second elastic region 72 is the same as the extension rate of the front first elastic region 51. Or smaller than the extension ratio of the front first elastic region 51.

FIG. 6 is a diagram schematically showing the relationship between the extension force and the extension ratio of the specimens 125 and 126 among the specimens 123 to 126 obtained based on the procedure shown in FIG. The vertical axis in FIG. 6 shows the value of N / W ₀ which is the extension ratio per 1 mm width when the specimen is at the length L ₀ . The horizontal axis shows the elongation percentage to the length L ₀ of the specimen in percent. In the illustrated example, when the extension force with respect to the specimens 125 and 126 is 0.01 N / 1 mm, the extension ratio n (%) of the specimen 126 is larger than the extension ratio m (%) of the specimen 125, and the rear first It can be seen that the second elastic region 72 extends more easily than the front second elastic region 52. In the diaper 10, the elongation ratio n is set to be at least 1.3 times the elongation ratio m.

  Thus, in this invention which calculates | requires an expansion | extension ratio and expansion force, when the expansion | extension force is 0.01 N / 1mm, the expansion | extension ratio of the back 1st elastic region 71 is 0. 0 of the expansion | extension rate of the front 1st elastic region 51. When it is within the range of 8 to 1.2 times, it is considered that the extension ratios of the front first elastic region 51 and the rear first elastic region 71 are the same.

Incidentally, in the present invention, in order to determine the extension magnification of the elastic members 45, 46 in the diaper 10, for each of the specimens 123-126 of Figure 5, the elastic members 45 and 46 at the time it is a length _{L 0} in search of length, and the length thereof is set as M _0. Next, the specimen is immersed in toluene for 5 hours, for example, to dissolve the hot melt adhesive, and the elastic members 45 and 46 are separated from the nonwoven fabric and dried. Let M be the length of the elastic members 45 and 46 after drying, and let M ₀ / M be the expansion ratio.

  In the illustrated example of the present invention, the crotch panel 14 of the diaper 10 includes a body fluid-absorbing core 37, but the crotch panel 14 does not include such a core and is scheduled to be used as a urine absorbing pad. It may be a thing. The crotch panel 14 may also be formed by joining a member whose side edge portion 32 is prepared separately from the central portion 40 to the central portion 40.

2 Front waistline area 3 Rear waistline area 4 Inseam area 10 Disposable pants-type diaper 12 Front panel 13 Rear panel 14 Inseam panel 16 Side part 17 Side part 19 Joining area 26 Front end part, reference end part 27 Rear end part, reference end part 31 Front edge portion 32 Side edge portion 40 Center portion 51 Front first elastic region 52 Front second elastic region 61 Rear end edge portion 71 Rear first elastic region 72 Rear second elastic region X Lateral direction Y Vertical direction Z Front-rear direction

Claims (5)

Each of a front waistline region, a back waistline region, and a crotch region is formed by a front panel, a rear panel, and a crotch panel having a lateral direction, a vertical direction, and a front and back direction that are orthogonal to each other, and the front panel and the rear panel are The lateral extension and contraction are possible, and both sides of the lateral direction overlap with each other to form a joining area extending in a straight line in the vertical direction, forming the front and rear waist regions having an outer surface, a disposable pants-type diaper having a rear end portion of the crotch panel overlaps the outer surface of the rear panel and the front end portion overlapping the outer surface of said front panel,
The front panel and the rear panel have the same lateral dimensions, and a plurality of strips of elastic members extend to the both side portions, respectively, and the front end portion and the rear panel The rear end portion is a reference end portion in which the position in the up and down direction is above, and the front panel is positioned above the reference end portion, and the first front elastic region, A rear first elastic region having a front second elastic region located below the front first elastic region, the rear panel being located above the reference end, and the rear first elastic region. A rear second elastic region located below,
The front first elastic region, the front second elastic region , the rear first elastic region, and the rear second elastic region cause an extension force of 0.01 N to act in the lateral direction per 1 mm in the vertical direction. The front first elastic region and the rear first elastic region have the same expansion rate, and the rear second elastic region has a higher expansion rate than the front second elastic region. diaper said.   Each of the front end portion and the rear end portion of the crotch panel is joined to the outer surface at an end edge portion extending in the lateral direction and both side edge portions extending in the up-down direction, and between the side edge portions. The diaper according to claim 1, wherein the central portion located is not joined to the outer surface except for the edge portion.   The diaper according to claim 1 or 2, wherein the extension ratio of the front second elastic region is larger than the extension ratio of the front first elastic region.   The diaper according to claim 1, wherein the extension ratio of the rear second elastic region does not exceed the extension ratio of the rear first elastic region.   The diaper according to any one of claims 1 to 4, wherein an expansion ratio of the elastic member in the front second elastic region is higher than an expansion ratio of the elastic member in the rear second elastic region.

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