JP2009240694A - Disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disposable diaper in which a level difference by the sliding-down of the front end flap of an absorptive chassis is not generated while worn and excrement does not leak out to the outside, and which is excellent on appearance as well. <P>SOLUTION: At least the front waist region 13 of front and rear waist regions 13 and 14 has elastic regions 25, 26 and 27 extending at least in a transverse direction Y. The elastic regions 25, 26 and 27 are formed of a first elastic region 25 extending in the transverse direction Y near the front end flap 62 of the absorptive chassis 12 from a waist opening edge part 23a, a second elastic region 26 adjacent to the first elastic region 25 and extending in the transverse direction Y, and a pair of third elastic regions 27 adjacent to the second elastic region 26, extending from the side edge 18 of the front waist region 13 to both sides of the absorptive chassis 12 and separately facing each other in the transverse direction Y on both sides of a non-elastic region 28A formed at the transverse direction center part of the front waist region 13. The second elastic region 26 crosses the front end flap 62 of the absorptive chassis 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a disposable diaper, and more particularly to a disposable diaper having a suitable fit and good appearance.

In order to ensure fitability to the wearer's body, disposable diapers having a plurality of waist elastic elements extending in the direction around the waist in the front and rear waist region are generally known. For example, as shown in FIGS. 6 (a) and 6 (b), Patent Document 1 includes a front / rear waist region, a crotch region, an absorbent chassis 112 disposed on the inner surface of the elastic waist member 111, and a waist opening edge 123 a. Disclosed is a disposable diaper 110 having a plurality of waist elastic elements 130 extending in the longitudinal direction with a given distance apart and a waist elastic element extending from a side edge of the front and rear waist region to a side edge of the absorbent chassis.
JP 2002-248127 A

  In the invention disclosed in Patent Document 1, the waist elastic element 130 does not cross the absorbent chassis 112. As a result, the contraction force of the waist elastic element 130 does not directly act on the absorbent core 148 included in the absorbent chassis 112, and wrinkles do not occur on the absorbent core 148, so that the absorbent performance is not greatly deteriorated.

  However, referring to FIG. 6A, when the diaper 110 is worn, the front end flap 162 of the absorbent chassis 112, that is, the portion where the absorbent core 148 does not exist in the absorbent chassis 112 and the body A of the wearer. A space S is formed between them. This is because the absorbent core 148 usually contains fluff pulp or the like for improving its liquid absorbency and diffusibility, has a given thickness compared to the front end flap 162 made of only a sheet member, and has a waist elasticity This is because the waist opening edge portion 123a where the element 130 is disposed and closely contacts the wearer's body A and the absorbent core 148 are separated from each other. In particular, when the absorbent core 148 absorbs a large amount of urine, the thickness of the absorbent core 148 increases and the space S becomes larger.

  In such a state, when the wearer bends forward, the wearer's body A pushes the waist opening edge 123a and the vicinity thereof forward to the wearer, so that the front end flap 162 and the position facing it are placed. A part of a certain waist member bends toward the space S, and as shown in FIG. 6 (b), it slips down between the wearer's body A and the absorbent core 148, resulting in a step R.

  The step R not only detracts from the appearance of the diaper 110 but also causes urine that could not be absorbed by the absorbent core 148 to accumulate in the step R, causing excrement to leak to the outside.

  Therefore, according to the present invention, during wearing of the diaper, at least the front end flap of the absorbent chassis and the portion of the front waist panel at the opposite position may slip between the wearer's body and the absorbent core. In addition, since a step does not occur in a part of the front waist region, it is an object to provide a disposable diaper that excretes are not leaked to the outside and that is good in appearance.

  In order to solve the above-mentioned problems, the present invention is directed to the vertical and horizontal directions, the skin contact surface and the non-skin contact surface, the front waist region, the rear waist region, and the front and rear waist regions. A crotch region positioned between the waist opening and a pair of leg openings, an annular elastic waist panel forming the front and rear waist region, and a front and rear portion of the waist panel, and from the crotch region to the front and rear waist region A disposable diaper extending and including an absorbent core and an absorbent chassis having front and rear end flaps extending in the longitudinal direction from front and rear end edges of the absorbent core.

  The feature of the present invention is that at least the front waist region of the front and rear waist regions has a stretchable region extending at least in the lateral direction, and the stretchable region extends from an edge of the waist opening. In the vicinity of the front end flap of the absorbent chassis, the first stretchable region extending in the lateral direction, adjacent to the first stretchable region, the second stretchable region extending in the lateral direction, adjacent to the second stretchable region, A pair of third stretch regions extending from the side edges of the front waist region to both sides of the absorbent chassis and facing and spaced apart in the lateral direction on both sides of the non-stretch region formed at the lateral center of the front waist region; And the second stretchable region crosses the front end flap of the absorbent chassis.

The present invention includes the following preferred embodiments in addition to the characteristic configuration.
(1) The extension stress of the second stretch region is the same as or greater than the extension stress of the first stretch region.
(2) The correlation of the elongation stress between the first stretchable region, the second stretchable region, and the third stretchable region is second stretchable region ≧ first stretchable region> third stretchable region.
(3) A plurality of strand-like waist elastic elements extending in the lateral direction are disposed in the first, second, and third stretch regions, and the waist elastic elements that form the first stretch region and the The waist elastic element that forms the second stretchable area is an elastic element having an equivalent expansion ratio.
(4) In the first, second and third stretchable regions, a plurality of strand-like waist elastic elements extending in the lateral direction are arranged, and the waist elastic elements are all made of the same elastic element.

  In this invention, at least the front waist region of the front and rear waist regions, the waist elastic element extending in the lateral direction of the front end flap of the absorbent chassis is disposed, so that the front end flap is brought into close contact with the wearer's body due to the extension stress Can be made. Thereby, since a front end flap does not slip | deviate between a wearer's body and an absorptive core, excrement does not leak, but a disposable diaper which is good also in appearance can be obtained.

  FIG. 1 is a partially broken perspective view showing a wearing state of the diaper 10. 2 is a developed plan view when the diaper 10 is peeled back and forth at the seam portion 22 and extended in the vertical direction X and the horizontal direction Y, and FIG. 3 is a cross-sectional view taken along the line III-III in FIG. FIG. 4 is a view showing a state where the absorbent chassis 12 is removed in FIG.

  As shown in FIG. 1, the diaper 10 includes an annular elastic waist panel 11, an absorbent chassis 12 attached to the skin contact surface side of the annular elastic waist panel 11, a front waist region 13, and a rear waist region 14. And a crotch region 15 extending in the longitudinal direction X between the front and rear waist regions 13 and 14.

  The elastic waist panel 11 includes a rectangular front waist panel 16 that forms the front waist region 13, and a substantially trapezoidal rear waist panel 17 that forms a part of the rear waist region 14 and the crotch region 15. . Both side edges (both side edges of the front and rear waist regions) 19a, 20a of the front waist panel 16 and the rear waist panel 17 are overlapped with each other, and a known joining means such as a seam portion 22 intermittently aligned in the longitudinal direction X, for example, The waist opening 23 and the pair of leg openings 24 are defined by being joined by various heat welding means such as hot embossing and sonic.

  As shown in FIGS. 1 and 4, the front and rear waist regions 13, 14 are adjacent to the first stretchable region 25 extending in the lateral direction Y along the waist opening edge 23 a and the first stretchable region 25, and the absorbent chassis 12. A pair of first and second non-stretchable regions 28A and 28B that are spaced apart from each other in the lateral direction Y on both sides of the second stretchable region 26 that crosses the front end portion of the first and second non-stretchable regions 28A and 28B. The third elastic region 27 is divided into the elastic regions 25, 26, and 27, and the strand-like waist elastic elements 30, 31, and 32 are disposed.

  Specifically, a plurality of first waist elastic elements 30 extending along the waist opening edge 23a are arranged in the first stretchable region 25, and the absorbent chassis 12 is placed in the second stretchable region 26. A plurality of second waist elastic elements 31 extending in the lateral direction Y are arranged, and the third stretchable region 27 includes a plurality of second waist elastic elements 31 extending in the lateral direction Y at both side portions 13a, 14 of the front and rear waist regions 13, 14. A three-waist elastic element 32 is arranged. A large number of gathers 33 are formed on the surface of the diaper 10 by the contraction of the waist elastic elements 30, 31, 32 (see FIG. 1). It should be noted that at least only the first non-stretchable region 28A of the first and second non-stretchable regions 28A, 28B may be formed. In addition, a pair of fourth stretch regions 34 that are spaced apart in the lateral direction Y are formed on both sides of the second non-stretch region 28B at a portion that constitutes a part of the crotch region 15 of the rear waist panel 17. In the stretchable region 34, a plurality of fourth waist elastic elements 35 extending in the lateral direction Y are arranged.

  As shown in FIGS. 2 and 3, the front and rear waist panels 16 and 17 are formed of an inner layer sheet 40 located on the skin contact surface side and an outer layer sheet 41 located on the non-skin contact surface side. The outer layer sheet 41 has extending portions 43 that extend from the front and rear end edges 40a and 40b of the inner layer sheet 40 in the longitudinal direction X. The extending portion 43 includes the front waist panel 16 and the rear waist panel 31. After the absorptive chassis 12 is arranged inside, it is folded back to the skin contact surface side of the diaper and joined to both side portions 13a and 14a. Thus, since the extension part 43 of the outer layer sheet 41 covers the front and rear end edges 40a and 40b of the inner layer sheet 40, it is possible to suppress excrement from leaking out from the front and rear end edges 40a and 40b. .

  For the inner layer sheet 40 and the outer layer sheet 41, hydrophobic fiber nonwoven fabrics, moisture-permeable plastic films, and laminate sheets thereof are preferably used.

  Waist elastic elements 30, 31, 32, and 35 are interposed between the inner layer sheet 40 and the outer layer sheet 41, and a hot melt adhesive (at least on the inner surface of the inner layer sheet 40 of both sheets 40 and 41). (Not shown) is attached to be stretchable. However, the waist elastic elements 30, 31, 32, and 35 are not disposed between the inner layer sheet 40 and the outer layer sheet 41 in the first and second non-stretchable regions 28A and 28B.

  As shown in FIGS. 2 and 3, the absorbent chassis 12 includes a liquid absorbing structure 45. The liquid-absorbent structure 45 includes a liquid-permeable body side liner (top sheet) 46, a liquid-impermeable back sheet 47, an absorbent core 48 having a sufficient capacity for absorbing body fluid, and an absorbent core 48. And an absorbent panel 50 having a liquid diffusing sheet 49 to be wrapped.

  The liquid absorbent structure 45 has a hot back sheet 47 extending from the front and rear end edges 50a, 50b of the absorbent panel 50 outward in the vertical direction X and a body side liner 46 extending further outward in the vertical direction X than the back sheet 47. An end flap extending in the lateral direction Y and bonded to the body through a melt adhesive (not shown); and a body side liner 46 extending outward in the lateral direction Y from the pair of side edges 50c of the absorbent panel 50; A pair of inner side flaps 54 that are formed by joining the back sheet 47 to each other via a hot melt adhesive (not shown) and extend in the longitudinal direction X, and the longitudinal direction on both sides of the liquid-absorbing structure 45. A pair of barrier leg cuffs 55 extending to X.

  The absorbent chassis 12 also includes a first sheet member 58 fixed to the lower surface of the absorbent structure 45 via a hot melt adhesive application region 56, and a side of the absorbent structure 45 of the first sheet member 58. A pair of sleeve-shaped outer side flaps 61 formed by joining portions that extend outward in the direction Y (extending portions) 58a to the inside and joining the overlapping portions via the hot melt adhesive 60 are provided. Including. Each outer side flap 61 covers the outer edge of each inner side flap 54. Since the outer edge of each inner side flap 54 is covered with each outer side flap 61, the outer edge of each inner side flap 54, which is usually the cutting edge of the seat, comes into contact with the wearer's skin. Without irritation, it is possible to prevent itching and rash.

  Further, the first chassis member 58 is fixed to the lower surface of the liquid-absorbent structure 45 in this manner, so that the absorbent chassis 12 extends from the back sheet 47 of the body side liner 46 to the outside in the longitudinal direction X. And front and rear end flaps 62 and 63 made of only the sheet member formed by the front and rear end edges of the first sheet member 58.

  Inside the sleeve of each outer side flap 61, a strand-like elastic element 67 extending so as to be shrinkable in the longitudinal direction X is attached via a hot melt adhesive (not shown). Thereby, the outer side flap 61 curves inward in the lateral direction Y due to the contraction of the elastic element 67 and elastically presses against the wearer's thigh when the diaper 10 is worn. In the present embodiment, the number of elastic elements 67 is one, but a plurality of strips may be arranged as necessary.

  Each barrier leg cuff 55 is formed of an extended portion 58a of the first sheet member and a second sheet member 64 folded in two, and the overlapping edge portion of the second sheet member 64 is hot. It has a fixed portion 65 fixed to the extending portion 58a via a melt adhesive (not shown), and a sleeve-like free edge portion 66 formed from a bent portion of the second sheet member 64. The free edge portion 66 faces the extending portion 58a of the first sheet member 58 in the unfolded state of the diaper 10, and three elastic elements 68, 69, 70 extending in the longitudinal direction X are hot on the inner surface thereof. It is fixed via a melt adhesive (not shown). When the diaper 10 is worn, the elastic elements 68, 69, and 70 are extended, the free edge 66 is separated from the extending portion 58 a of the first sheet member 58, and excrement is externally exposed from both sides of the absorbent chassis 12. It is possible to suppress leakage into the water.

  In the present embodiment, three elastic elements 68, 69, 70 are mounted in the free edge 66, but each elastic element 68, 69, 70 attaches the free edge 66 when the diaper 10 is worn. As long as it has the extension stress which is spaced apart from the extension part 58a of the 1st sheet | seat member 58 and press-contacts to a wearer's groin part, at least 1 should just be arrange | positioned. Further, instead of these elastic elements 68, 69, 70, a single sheet having a required width that can be elastically contracted can be used for the second sheet member 64.

  In the absorbent panel 50, a liquid-absorbent core 48 made of a mixture of fluff pulp, superabsorbent polymer (SAP), and, if necessary, heat-weldable staple fibers has a liquid diffusive property such as tissue paper. Covered with a shaped sheet 49. Thus, since the whole absorptive core 48 is encapsulated with the shape-retaining sheet 49, it is possible to prevent the deformation of the shape and the drop-off of the SAP. The absorbent core 48 is compressed into an hourglass contour shape so as to improve shape retention and liquid absorption diffusivity, and has higher rigidity than the sheet member constituting the diaper 10 and is called semi-rigid. Sometimes.

  FIG. 5 is a schematic cross-sectional view taken along line VV in FIG. 2 when the diaper 10 is worn, and FIG. 6 is a schematic cross-sectional view corresponding to FIG. 5 of the disposable diaper 110 of the prior art.

  As shown in FIG. 5, a second waist elastic element 31 that crosses the front end flap 52 of the absorbent chassis 12 in the lateral direction Y is disposed in the second stretchable region 26 of the front waist region 13. Thus, since the 2nd waist elastic element 31 crosses the front end flap 52 of the absorptive chassis 12, it can prevent that a level | step difference arises in a part of front waist panel 16. FIG.

  That is, as shown to Fig.6 (a), in the disposable diaper 110 of a prior art, the space S is formed between the front end flap 162 of the absorptive chassis 112, and a wearer's body A. As shown in FIG. This is because the absorbent core 148 usually contains fluff pulp or the like for improving its liquid absorbency and diffusibility, has a given thickness compared to the front end flap 162 made of only a sheet member, and has a waist elasticity This is because the waist opening edge portion 123a where the element 130 is disposed and closely contacts the wearer's body A and the absorbent core 148 are separated from each other. In particular, when the absorbent core 148 absorbs a large amount of urine, the thickness of the absorbent core 148 increases and the gap S becomes larger.

  In such a state, when the wearer bends forward, the wearer's body A pushes the waist opening edge 123a and the vicinity thereof forward of the wearer, so the front end flap 162 and the elastic waist facing it. The part of the member 111 is bent toward the space S, and as shown in FIG. 6B, the front end flap 162 and the part of the elastic waist member 111 opposite to the front end flap 162 are the wearer's body A and the absorbent core 148. And a step R is generated.

  The level difference R not only causes the diaper 110 to deviate from the desired position, but urine that the absorbent core 148 could not absorb could accumulate in the level difference R and leak to the outside. Is also not preferable.

  In particular, as in the present embodiment, when the annular elastic waist panel 11 and the absorbent chassis 12 including the absorbent core 48 are formed separately, the absorbent chassis 12 becomes the elastic waist panel 11. Since it is in a suspended state, the absorbent chassis 12 may move inside the elastic waist panel 11 due to the movement of the wearer, and the absorbent core 48 is directly interposed inside the elastic waist panel 11. Compared to the diaper 10, such a step is likely to occur.

  In the present invention, as shown in FIG. 5, since the second waist elastic element 31 is disposed so as to cross the front end flap 62 of the absorbent chassis 12, that is, in the second stretchable region 26, the front end flap 62 is worn. Close to the body A of the wearer, no space S is formed between the front end flap 62 and the wearer's body A, and the second stretchable region 26 is between the absorbent core 48 and the wearer's body A. There is no slipping down.

  Moreover, in such an embodiment, when the extension stress of the second stretchable region 26 is smaller than the stretch stress of the first stretchable region 25, when the wearer bends forward, the second stretchable region 26 bends, There is a possibility that the second stretchable area 26 and the front end flap 62 are folded and a step is formed in a part of the front waist area 13. Therefore, whether the extension stress of the second stretchable region 26 is equivalent to that of the first stretchable region 25 so that the adhesion to the wearer's body is not hindered by the influence of the stretch of the first stretchable region 25. Or more than that is preferable. On the other hand, the first stretchable region 25 requires a desired stretching stress to fix the front and rear waist regions 13 and 14 of the diaper 10 at a required position around the wearer's torso. Preferably it is greater than 27. Therefore, it is preferable that the correlation between the elongation stresses in the stretchable regions 25, 26, and 27 is as follows: second stretchable region 26 ≧ first stretchable region 25> third stretchable region 27.

  Specifically, the extension stress at 65% when the first extension region 25 is at the maximum extension is 38 to 42 mN / mm, the extension stress at 65% when the second extension region 26 is at the maximum extension is 42 to 48 mN / mm, It is preferable that the extension stress at 65% of the maximum extension / contraction area 27 is 28 to 32 mN / mm. When the extension stress at 65% at the maximum extension of the second stretchable region 26 is 42 mN / mm or less, the front end flap 62 cannot be brought into close contact with the wearer's body A, and the above-described effects cannot be exhibited. Because.

  In addition, the elongation stress of each expansion / contraction area | region 25,26,27 is measured with the following method.

  First, the seam portion 22 of the diaper 10 is peeled off so as to be in an unfolded state as shown in FIG. 2, and the waist elastic elements 30, 31, 32 are stretched. The length is the length at maximum extension. Next, the entire front waist panel 16 is cut out from the diaper 10, and the stretchable regions 25, 26, 27 are cut out from the cut out front waist panel 16 as samples, and the region width of each sample (the dimension in the longitudinal direction Y of the diaper 10). ). When cutting each stretchable region 25, 26, 27, it cuts in the longitudinal direction X center part of the area | region located between each adjacent waist elastic elements 30,31,31. The sample is fixed in a contracted state between chucks of a tensile tester (manufactured by Shimadzu Corporation) (the initial distance between chucks is set to 100 mm and appropriately adjusted according to the sample), and the sample is subjected to a tensile speed of 100 mm / min. The diaper 10 is stretched in the same direction as the lateral direction Y, the load (mN) at a length of 65% at the time of maximum elongation is measured, and each stretchable region 25 is calculated by the formula of measured value (mN) ÷ region width (mm). , 26 and 27 were calculated.

  In addition, the expansion ratio of the second expansion / contraction region 26 is preferably equal to or greater than the expansion magnification of the first expansion / contraction region 25. When the expansion ratio of the second expansion / contraction area 26 is smaller than the expansion ratio of the first expansion / contraction area 25, when the wearer bends forward and the first expansion / contraction area 25 is further expanded, the expansion is affected. This is because there is a possibility that the second stretchable area 26 is separated from the wearer's body A and a space S is formed.

  The first to third waist elastic elements 30, 31, and 32 are made of natural or synthetic rubber, and a strand-like or tape-like thing having rubber elasticity can be used.

  Specifically, when the waist elastic elements 30, 31, 32 are made of strand rubber elastic elements, the first and second waist elastic elements 30, 31 have a cross-sectional area of 550 to 650 dtex and an expansion ratio. As the third waist elastic element 32, those having a cross-sectional area of 450 to 500 dtex and an expansion ratio of 300 to 350% can be used as the third waist elastic element 32, respectively.

  However, as long as each stretchable region 25, 26, 27 has a desired elongation stress, the first waist elastic element 30 and the second waist elastic element 31 are composed of elastic elements having different cross-sectional areas and expansion ratios. Alternatively, the waist elastic elements 30, 31, 32 may all be composed of the same member. In the illustrated example, the front waist region 13 includes four first waist elastic elements 30, five second waist elastic elements 31, and seven third waist elastic elements 32. According to the elongation stress required by 26 and 27, the number thereof and the separation distance (pitch) between the waist elastic elements 30, 31, and 32 arranged in parallel can be appropriately changed. For example, when the second stretchable region 26 requires a larger elongation stress than the first stretchable region 25, when the first and second waist elastic elements 30, 31 are made of the same member, as shown in the figure, Naturally, the pitch between the second waist elastic elements 31 is set smaller than the pitch between the first waist elastic elements 30.

  In order to give a desired elongation stress to each stretchable region 25, 26, 27, instead of disposing each waist elastic element 30, 31, 32 as in this embodiment, an elastic stretchable sheet is formed in an annular shape. You may adhere to the inner surface of the elastic waist panel 11, and the sheet | seat member which comprises the cyclic | annular elastic waist panel 11 may have elastic elasticity.

  Referring to FIG. 4 again, a fourth stretchable region 34 is formed inside the third stretchable region 27 of the rear waist panel 17. A fourth waist elastic element 35 made of the same elastic element as the third waist elastic element 32 arranged in the third elastic region 27 is arranged in the fourth elastic region 34. As shown in the figure, the number of the fourth waist elastic elements 35 is smaller than that of the other waist elastic elements 30, 31, 32, and the elongation stress of the fourth stretchable region 34 in the lateral direction Y is in the lateral direction Y. It is set lower than that of the other stretchable areas 25, 26, 27.

  Such a 4th expansion-contraction area | region 34 can cover the required range of a wearer's buttocks, and can form a soft contact surface along the curved surface of a buttocks.

  For each of the constituent members forming the front and rear waist panels 16 and 17 and the absorbent chassis 12, various materials commonly used in this type of disposable diaper can be used without limitation. Moreover, in this embodiment, although the elastic waist panel 11 is comprised only from the front-and-back waist panels 16 and 17, it is located between the front-and-back waist panels 16 and 17 and the front-and-back waist panels 16 and 17, and the crotch area 15 The front and rear waist panels 16 and 17 and the crotch member may be formed of a continuous sheet. Furthermore, in addition to the pants-type disposable diaper in which both side edges 19, 20 of the front and rear waist regions are connected in advance, the present invention can be applied to an open-type disposable diaper in which both side edges 19, 20 of the front and rear waist regions are not connected in advance.

The perspective view of the disposable diaper concerning this invention. The partially broken expansion | deployment top view of a diaper. III-III sectional view taken on the line of FIG. The figure of the state which removed the absorptive chassis of FIG. The VV sectional view taken on the line of typical Drawing 2 showing the wearing state of a disposable diaper. (A) (b) Typical sectional drawing corresponding to Drawing 5 showing the wearing state of the conventional disposable diaper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Disposable diaper 11 Elastic waist panel 12 Absorbent chassis 13 Front waist area 14 Rear waist area 15 Crotch area 19 Side edge 20 of front waist area Side edge 23 of rear waist area West opening 23a Waist opening edge 24 Leg opening 25 1st Stretchable area 26 Second stretchable area 27 Third stretchable area 28A Non-stretchable area (first non-stretchable area)
30 first waist elastic element 31 second waist elastic element 32 third waist elastic element 62 front end flap 63 rear end flap X longitudinal direction Y lateral direction

Claims (5)

A longitudinal direction and a lateral direction, a skin contact surface and a non-skin contact surface, a front waist region, a rear waist region, a crotch region located between the front and rear waist regions, a waist opening and a pair of leg openings; An annular elastic waist panel forming the front and rear waist regions;
Absorbent connected to the front and rear portions of the waist panel, extending from the crotch region to the front and rear waist region, and having an absorbent core and front and rear end flaps extending from the front and rear end edges of the absorbent core in the longitudinal direction. In disposable diapers including a chassis,
At least the front waist region of the front and rear waist regions has at least a stretchable region extending in the lateral direction,
A first stretchable region extending in the lateral direction in the vicinity of the front end flap of the absorbent chassis from an edge of the waist opening, and a second stretchable adjacent to the first stretchable region and extending in the lateral direction. Adjacent to the second stretchable region, extending from the side edge of the front waist region to both side portions of the absorbent chassis, and on both sides of the non-stretchable region formed at the laterally central portion of the front waist region. Formed from a pair of third stretchable regions that are spaced apart in the lateral direction,
The diaper characterized in that the second stretchable region crosses the front end flap of the absorbent chassis.   The diaper according to claim 1, wherein an extension stress of the second stretch region is equal to or greater than an extension stress of the first stretch region.   The correlation of the elongation stress between the first stretchable region, the second stretchable region, and the third stretchable region is second stretchable region ≧ first stretchable region> third stretchable region. Diapers.   In the first, second and third stretchable regions, a plurality of strand-like waist elastic elements extending in the lateral direction are arranged, and the waist elastic element forming the first stretchable region and the second stretchable region The diaper according to any one of claims 1 to 3, wherein the waist elastic element forming the region is an elastic element having an equivalent expansion ratio.   A plurality of strand-like waist elastic elements extending in the lateral direction are disposed in the first, second and third stretchable regions, and the waist elastic elements are all made of the same elastic element. 4. The diaper according to any one of 4.

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