JP5306690B2 - Disposable diapers - 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 or the sliding-up of an absorptive core is not generated while the diaper is worn, and which is excellent in appearance as well. <P>SOLUTION: At least the front waist region 13 of front and rear waist regions 13 and 14 is formed of a first elastic region extending in a transverse direction Y in a front end part including the front end flap of the absorptive chassis 12 from the edge part of a waist opening 16, a pair of second elastic regions extending from the side edge 18c of the front waist region 13 to both sides of the front end part of an absorptive panel and separately facing each other in the transverse direction Y on both sides of a first non-elastic region formed at the center part in the transverse direction Y of the front waist region 13, and a pair of third elastic regions extending from the side edge 18c of the front waist region 13 to both sides of the front end part of the absorptive panel and separately facing each other in the transverse direction Y on both sides of the non-elastic region. The first elastic region crosses the front end part of the absorptive panel. <P>COPYRIGHT: (C)2010,JPO&amp;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 discloses that a longitudinal waist region, a crotch region, an absorbent chassis 112 disposed on the inner surface of the waist member 111, and a waist opening edge 116 a Disclosed is a disposable diaper 110 having a plurality of waist elastic elements 126 extending in a direction spaced apart by a given dimension and waist elastic elements extending from the side edges of the front and rear waist regions to the side edges of the absorbent chassis 112.
JP 2002-248127 A

  In the invention disclosed in Patent Document 1, the waist elastic element 126 does not cross the absorbent chassis 112. Accordingly, the contraction force of the waist elastic element 130 does not directly act on the absorbent core 144 included in the absorbent chassis 112 and the absorbent core 144 does not wrinkle, so that the absorbent performance is not greatly deteriorated.

  However, referring to FIG. 6 (a), when the diaper 110 is worn, the front end flap 162 of the absorbent chassis 112, that is, the portion where the absorbent core 144 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 144 usually includes 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 portion located between the waist opening edge portion 116 a where the element 126 is disposed and closely contacts the wearer's body A and the absorbent core 144 is separated. In particular, when the absorbent core 144 absorbs a large amount of urine, the thickness of the absorbent core 144 increases and the space S becomes larger.

  In such a state, when the wearer bends forward, etc., the wearer's body A pushes the waist opening edge 116a and its vicinity forward, so the front end flap 162 and the waist member in a position facing it. 111 part 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 144, resulting in a step R.

  Even if the waist elastic element 126 is disposed on the front end flap 162, the absorbent core 144 increases in thickness by absorbing a large amount of urine as described above. The front end portion and the portion of the waist member 111 opposite to the front end portion are shifted upward on the front end flap 162 that is in close contact with the wearer's body A, and the front end flap 162 and the portion of the waist member opposite thereto are shifted to the space S. Like the state, that is, the state shown in FIG.

  The step R not only impairs the appearance of the diaper 110 but also causes urine that could not be absorbed by the absorbent core 144 to accumulate therein, causing excrement to leak to the outside.

  Therefore, the present invention does not cause a step due to the front end flap of the absorbent chassis falling off or part of the front waist region while wearing a diaper, and excrement does not occur. It is an object to provide a disposable diaper that has no risk of leaking to the outside and that also looks good.

In order to solve the above problems, the first and second inventions of the present application are directed to the vertical direction and the horizontal direction, the skin contact surface and the non-skin contact surface, the front waist region, and the 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, and a front and rear portion of the elastic waist panel, the crotch A disposable diaper comprising an absorbent panel having an absorbent core extending from a region to the front and rear waist region, and an absorbent chassis having front and rear end flaps extending from the front and rear end edges of the absorbent panel in the longitudinal direction. is there.

The first invention of the present application is characterized in that at least the front waist region of the front and rear waist regions has an elastic region extending at least in the lateral direction, and the elastic region is an edge of the waist opening. A first stretchable region extending in the lateral direction at a front end portion including the front end flap of the absorbent chassis from a portion, adjacent to the first stretchable region, and a front end portion of the absorbent panel from a side edge of the front waist region Adjacent to the second stretchable region and a pair of second stretchable regions extending to both sides of the front waist region and spaced apart from each other in the lateral direction on both sides of the first non-stretchable region formed at the central portion in the lateral direction of the front waist region And a pair of third stretch regions extending from the side edge of the front waist region to both sides of the front end portion of the absorbent panel and facing and spaced apart in the lateral direction on both sides of the first non-stretch region. The first And across the front end portion of the reduced gamut said absorbent panel, said a first stretchable zone, the second elasticized zone, the correlation between tensile stress and the third stretchable zone are second elasticized zone ≧ first It is 1 stretch area> 3rd stretch area, Comprising: The rigidity value by the Taber method of the said absorptive core is 0.03-0.15 N * cm.
The second invention of the present application is characterized in that the front / rear waist region has at least a stretchable region extending in the lateral direction, and the elastic waist panel extends from the side edge of the rear waist region to the crotch. A first extending region extending in the lateral direction at a front end including the front end flap of the absorbent chassis from an edge of the waist opening; Adjacent to the stretchable region, extending from the side edge of the front waist region to both sides of the front end portion of the absorbent panel, and on both sides of the first non-stretchable region formed at the lateral center of the front waist region A pair of second stretchable regions that are spaced apart from each other in the lateral direction, adjacent to the second stretchable region, extending from side edges of the front waist region to both sides of the front end of the absorbent panel, Said sideways on both sides A pair of third stretch regions that are spaced apart from each other, the first stretch region crossing the front end of the absorbent panel, the first stretch region, the second stretch region, The correlation of the elongation stress with the third stretch region is second stretch region ≧ first stretch region> third stretch region, and the stretch region in the rear waist region is between both side edges of the rear waist region. A fourth stretchable region extending in the lateral direction along the edge of the waist opening; a fifth stretchable region adjacent to the fourth stretchable region and extending to the rear edge of the absorbent panel; and a fifth stretchable region Adjacent to the second non-stretchable region formed at the lateral center of the rear waist region and adjacent to the sixth stretchable region, and a pair of sixth stretchable regions spaced apart from each other in the lateral direction. And on both sides of the second non-stretchable region of the extended portion of the elastic waist panel. And a pair of seventh stretch regions that are spaced apart from each other in the lateral direction, and the correlation between the extension stresses of the fourth stretch region, the fifth stretch region, the sixth stretch region, and the seventh stretch region. However, it is 6th expansion-contraction area 38> = 4th expansion-contraction area 36> 5th expansion-contraction area 37> 7th expansion-contraction area.

These inventions include the following preferred embodiments in addition to the characteristic configuration.
( 1 ) 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 all have an equal expansion ratio. Formed from.
( 2 ) A plurality of strand-like waist elastic elements extending in the lateral direction are arranged in the first to third stretchable regions, and the waist elastic elements are all made of the same elastic element.

  In the present invention, since the first stretchable region is transverse to the front end flap of the absorbent chassis and the front end portion of the absorbent panel, the front end flap of the absorbent chassis slips off while the absorbent chassis is worn. Or the level | step difference by absorptive rising of an absorptive panel does not arise, excrement does not leak out outside, and a disposable diaper which is also good in appearance can be obtained.

FIG. 1 is a 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 21 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 of the state where the absorbent chassis 12 of FIG. 2 is removed (excluding the absorbent panel 46). In FIG. 4, for convenience of explanation, the absorbent panel 46 is indicated by a virtual line.

  As shown in FIG. 1, the diaper 10 includes an annular elastic waist panel 11, a chassis 12 attached to the skin contact surface side of the elastic waist panel 11, a front waist region 13, a rear waist region 14, and front and rear waists. A crotch region 15 located between the regions 13 and 14, a waist opening 16 and a pair of leg openings 17 are included. The waist opening 16 is defined by an annular elastic waist panel 11.

As shown in FIGS. 2 and 4, the elastic waist panel 11 includes a front waist panel 18 that forms the front waist region 13, and a rear waist panel 19 that forms part of the rear waist region 14 and the crotch region 15. ing. The front waist panel 18 is defined in a horizontal rectangular shape by an inner end edge 18a, an outer end edge 18b, and both side edges 18c connecting the inner end edge 18a and the outer end edge 18b. The trapezoidal shape is substantially trapezoidal by an inner edge 19a, an outer edge 19b, both side edges 19c extending inwardly from the outer edge 19b, and both oblique inner edges 19d connecting the outer edge 19b and the inner edge 19a. Is defined. Both side edges 18c of the front waist panel 18 and both side edges 19c of the rear waist panel are overlapped with each other, and various kinds of known means such as hot embossing and sonic are used in the seam portion 21 that is intermittently arranged in the vertical direction X. These are joined together by means of heat welding, and cooperate with the elastic waist panel 11 to define a pair of leg openings 17 (see FIG. 1). An extended portion 21 that forms a part of the crotch region 15 is located between both inner edges 19 d of the rear waist panel 19.

  The front and rear waist panels 18 and 19 are formed of a laminate of an inner layer sheet 22 located on the inner surface and an outer layer sheet 23 located on the outer surface. The outer layer sheet 23 has extending portions 24 that extend from the front and rear end edges 22 a and 22 b of the inner layer sheet 22 in the longitudinal direction X. The extending portion 24 is in contact with the front and rear waist panels 18 and 19. After the absorbent chassis 12 is disposed on the surface side, the absorbent chassis 12 is folded back toward the inside of the diaper 10, and both side portions thereof are fixed to both side portions (both side portions of the front and rear waist panels) 18f and 19f of the front and rear waist region. Thus, since the extension part 24 of the outer layer sheet 23 covers the front and rear end edges 22a and 22b of the inner layer sheet 22, it is possible to prevent the excrement from leaking out from the front and rear end edges 22a and 22b. Can do.

  For the inner layer sheet 22 and the outer layer sheet 23, a hydrophobic fiber nonwoven fabric, a moisture permeable plastic film, and a laminate sheet thereof are preferably used.

Furthermore, between the outer layer sheet 23 and the inner layer sheet 22 of the front and rear waist panels 18, 19, first to seventh waist elastic elements 26, 27, 28, 29, 30, 31, 32 are interposed, and at least It is attached to the inner surface of the inner layer sheet 22. As will be described later, the waist elastic elements 26, 27, 28, 29, 30, 31, and 32 allow the front waist region 13 to have first to third stretch regions 33, 34, and 35, and the rear waist region 14 to have Fourth to seventh expansion / contraction areas 36, 37, 38, 39 are formed. A plurality of ridges 25 are formed on the surface of the diaper 10 by contraction of the waist elastic elements 26, 27, 28, 29, 30, 31, and 32 (see FIG. 1).

  As shown in FIGS. 2 and 3, the absorbent chassis 12 includes a liquid absorbing structure 41. The liquid-absorbent structure 41 includes a liquid-permeable body-side liner (top sheet) 42, a liquid-impermeable back sheet 43, an absorbent core 44 having a sufficient capacity for absorbing body fluid, and an absorbent core 44. And an absorbent panel 46 having a liquid diffusing sheet 45 to be wrapped.

  The liquid absorbent structure 41 has a hot back sheet 43 extending from the front and rear end edges 46a and 46b of the absorbent panel 46 to the outside in the vertical direction X and a body side liner 42 extending further to the outside in the vertical direction X from the back sheet 43. An end flap formed by being joined via a melt adhesive (not shown) and extending in the lateral direction Y; and a body side liner 42 extending from the pair of side edges 46c of the absorbent panel 46 outward in the lateral direction Y. A pair of inner side flaps 52 that are formed by joining the back sheet 43 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-absorbent structure 41. A pair of barrier leg cuffs 53 extending to X.

The absorbent chassis 12 can also be mixed with the first sheet member 58 fixed via the application region 56 of the hot melt adhesive to the lower surface of the liquid-absorbent structure 41, liquid-absorbent structure of the first sheet member 58 A pair of sleeve-shaped outer sides formed by folding portions 41 (extending portions) 58 a extending outward in the lateral direction Y to the inside and joining the overlapping portions via a hot melt adhesive 60. A flap 61 is included. Each outer side flap 61 covers the outer edge of each inner side flap 52. Since the outer edge of each inner side flap 52 is covered with each outer side flap 61, the outer edge of each inner side flap 52, which is usually the cutting edge of the sheet, comes into contact with the wearer's skin. Without irritation, it is possible to prevent itching and rash.

  Since the first sheet member 58 is fixed to the lower surface of the liquid-absorbent structure 41 in this manner, the absorbent chassis 12 has a portion extending from the back sheet 43 of the body side liner 42 to the outside in the vertical direction X and the first sheet member 58. It has front and rear end flaps 62 and 63 formed by front and rear end edges of one 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 53 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 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 extended portion 58a of the first sheet member in the unfolded state of the diaper 10, and three elastic elements 68, 69, 70 extending in the longitudinal direction X are hot-melted on the inner surface thereof. It is attached via an 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 extension 58a, and the excrement is prevented from leaking out from both sides of the absorbent chassis 12. can do.

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 extensional stress separated from the extension part 58a of a 1st sheet member and press-contacted to a wearer's groin part, at least 1 should just be arrange | positioned. Further, instead of the 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 46, an absorbent core 44 made of a mixture of fluff pulp, super absorbent polymer (SAP), and heat-weldable staple fibers as necessary is covered with a liquid diffusible sheet 45 such as tissue paper. Has been. Thus, since the whole absorptive core 44 is encapsulated with the liquid diffusable sheet 45, it is possible to prevent the deformation of the mold and the drop-off of the SAP. The absorbent core 44 is compressed into an hourglass contour shape so as to improve shape retention and liquid absorption diffusivity, and has a higher rigidity than the sheet member constituting the diaper 10. Sometimes called.

  Referring to FIGS. 1 and 4 again, the front waist panel 18 includes a first stretchable region 33 extending in the lateral direction Y between the side edges 18c from the outer edge 18b to the front edge 47 of the absorbent panel 46; A pair of second stretchable regions 34 adjacent to the first stretchable region 33 and spaced apart in the lateral direction Y; a pair of third stretchable regions 35 adjacent to the second stretchable region 34 and spaced apart and opposed in the lateral direction Y; The front waist region 13 is divided into a first non-stretchable region 40 </ b> A that is located in the center portion in the lateral direction Y and separates each second stretchable region 34 and each third stretchable region 35.

  A plurality of first waist elastic elements 26 extending in the lateral direction Y between both side edges 18c of the front waist panel 18 are arranged in the first stretchable area 33, and the second stretchable area 34 is extended from the side edge 18c. The 2nd waist elastic element 27 extended to the side part of the front-end part 47 of the absorptive panel 46 is arrange | positioned, and the 3rd expansion-contraction area 35 is similar to the 2nd waist elastic element 27 from the side edge 18c. A third waist elastic element 28 extending to the side of the front end 47 of 46 is arranged.

The first non-stretchable region 40A is located in the central portion of the front waist panel 18 in the lateral direction Y. When the formation method is described, for example, as a method generally used in this type of disposable diaper There is a method of cutting back the second and third waist elastic elements 27, 28. That is, a hot melt adhesive is appropriately applied to the second and third stretchable areas 34 and 35 in a pattern, and is not applied to the first non-stretchable area 40A, but extends to the respective areas 34, 35, and 40A. The three-waist elastic elements 27, 28 are supplied under extension and fixed to the adhesive application region, and in this state, the second and third waist elastic elements 27, 28 located in the first non-stretchable region 40A are cut. Then, these elastic elements 27 and 28 are automatically contracted and returned to the fixed region (cutback). Thereby, the extended 2nd and 3rd waist elastic elements 27 and 28 do not exist substantially in 40 A of 1st non-expandable regions. Alternatively, the second and third waist elastic elements 27 and 28 extending in series can be supplied to each of the regions 34, 35, and 40A, and the portions located in the first non-stretchable region 40A can be removed. it can.

  Furthermore, the first non-stretchable region 40A is formed by fixing the second and third waist elastic elements 27 and 28 in the unstretched state as they are with a hot melt adhesive, and losing or suppressing their contractility. You can also

  Therefore, the “non-stretchable region” here refers to a case where the elastic element is cut or removed and substantially no elastic element is present, and a case where the elastic element does not exhibit contractility.

In this way, by forming the first non-stretchable area 40A , it is possible to attach a plastic sheet on which the graphic is printed on the inner surface of the first non-stretchable area 40A so that the graphic can be seen through. Since the contraction force of the elastic element does not directly act on the central part of the absorbent panel 46, the central part of the absorbent panel 46 does not deform, such as wrinkles, and there is no possibility that the absorbent performance of the absorbent core will deteriorate.

As shown in the drawing, the pitch in the longitudinal direction X of the first to third waist elastic elements 26, 27, 28 is the same. Further, the extension stress of the second extension region 34 is larger than the extension stress of the third extension region 35 and is equal to or greater than the extension stress of the first extension region 33. The expansion ratio is larger than that of the first expansion / contraction area 33 and is set to be equal to or higher than the expansion ratio of the third expansion / contraction area 35. Therefore, the expression of the correlation between the extension stresses of the first to third stretch regions 33, 34, 35 is the second stretch region 34 ≧ the first stretch region 33> the third stretch region 35, and the first to the third stretch region 35. The expression of the correlation between the expansion ratios of the three expansion / contraction areas 33, 34, and 35 is the second expansion / contraction area 34 ≧ the third expansion / contraction area 35 > the first expansion / contraction area 33.

  Specifically, the extension stress at 65% at the maximum extension of the first stretch region 33 is 38 to 42 mN / mm, the extension stress at 65% at the maximum extension of the second stretch region 34 is 42 to 48 mN / mm, It is preferable that the extensional stress at 65% of the maximum expansion / contraction area 35 is 28 to 32 mN / mm.

  In addition, the elongation stress of each expansion-contraction area | region 33,34,35 is measured with the following method.

First, the seam portion 21 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 26, 27, and 28 are stretched. The length is the length at maximum extension. Next, the entire front waist panel 18 is cut out from the diaper 10, and the stretchable regions 33, 34, 35 are cut out from the cut out front waist panel 18 as samples, and the region width of each sample (the dimension in the longitudinal direction Y of the diaper 10). ). When cutting each of the stretchable regions 33, 34, and 35, cutting is performed at the center in the longitudinal direction X of the region located between the adjacent waist elastic elements 26, 27, and 28. 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, and the load (mN) at a length of 65% at the maximum elongation is measured, and each stretchable region 33 is calculated by the formula of measured value (mN) ÷ region width (mm). , 34 , and 35 were calculated.

  Thus, in order to set the elongation stress and the expansion / contraction magnification of each expansion / contraction area 33, 34, 35, the second waist elastic element 27 has a cross-sectional area larger than that of the third waist elastic element 28, It is the same as or more than that of the first waist elastic element 26 and has an expansion ratio equivalent to that of the third waist elastic element 28 and larger than that of the first waist elastic element 26. Can be used.

  Specifically, as each of the waist elastic elements 26, 27, 28, the first waist elastic element 26 has a cross-sectional area of 550 to 650 dtex and an expansion ratio of 2.5 to 3.0 times. 27 has a cross-sectional area of 550 to 650 dtex and a stretching ratio of 3.0 to 3.5 times, and the third waist elastic element 28 has a cross-sectional area of 450 to 500 dtex and a stretching ratio of 3.0 to 3.5 times. Shaped elastic elements can be used.

Further, the first to third waist elastic elements 26, 27, and 28 are formed of the same elastic element , and the number and pitch of the elastic elements can be set so as to have a correlation with the elongation stress. For example, when the 1st waist elastic element 26 and the 2nd waist elastic element 27 are comprised from the same elastic element, making the pitch of the 2nd waist elastic element 27 smaller than the pitch of the 1st waist elastic element 26. Thus, the extension stress of the second extension region 34 can be made larger than the extension stress of the first extension region 33.

  As described above, the first stretchable region 33 extends in the lateral direction Y from the front end portion 47 of the absorbent panel 46, and the second stretchable region 34 that extends on both sides of the front end portion 47 of the absorbent panel 46 has other stretchable properties. Since it has an extensional stress larger than the areas 33 and 35, the front end portion 47 of the absorbent panel 46 is in close contact with the wearer's body and does not deviate from a desired position. Further, since the expansion ratio of the second expansion / contraction area 34 is larger than the expansion ratio of the first expansion / contraction area 33, the second expansion / contraction area 34 is not affected by the expansion / contraction of the first expansion / contraction area 33.

On the other hand, in the rear waist panel 19, a fourth stretchable region 36 extending between the side edges 19 c along the outer edge 19 b, and a fifth stretchable stretch adjacent to the fourth stretchable region 36 and extending to the rear end edge 46 b of the absorbent panel 46. A pair of sixth stretchable regions 38 adjacent to the region 37 and the fifth stretchable region 37 and facing each other in the lateral direction Y, and adjacent to the sixth stretchable region 38, extending to the inner edge 19a and spaced apart in the lateral direction Y It has a pair of 7th expansion-contraction area 39 which opposes. A second non-stretchable region 40B is formed between each sixth stretchable region 38 and each seventh stretchable region 39.

In the fourth and fifth stretch regions 36 and 37, strand-like fourth and fifth waist elastic elements 29 and 30 extending in the lateral direction Y between both side edges 19c are arranged. The sixth waist elastic element 31 extending from the side edge 19c to the side portion of the front end portion 47 of the absorbent panel 46 is disposed, and each seventh stretchable region 39 is located on the side of the absorbent panel 46 from the side edge 19c. A strand-like seventh waist elastic element 32 extending to the vicinity of the edge 46c is disposed.

The method of forming the second non-stretchable region 40B is the same as that of the first non-stretchable region 40A, and the elastic element is cut or removed so that the elastic element is not substantially present, or the elastic element exhibits contractility. It can be formed by not making it.

In the rear waist panel 19, the extension stress of the sixth extension region 38 is equal to or higher than the extension stress of the fourth extension region 36, and the extension stress of the fourth extension region 36 is the fifth extension region 37. The extension stress of the fifth extension region 37 is set to be greater than the extension stress of the seventh extension region 39. Furthermore, the expansion ratio of the fifth expansion / contraction area 37 and the sixth expansion / contraction area 38 is equal, and the expansion ratio of the expansion / contraction areas 37 and 38 is larger than the expansion ratio of the fourth expansion / contraction area 36, and The expansion magnification is larger than the expansion magnification of the seventh expansion / contraction region 39. Therefore, when the correlation of the extension stress of the fourth to seventh extension regions 36, 37, 38, 39 is expressed by an equation, the sixth extension region 38 ≧ the fourth extension region 36> the fifth extension region 37> the seventh extension region. When the correlation between the expansion ratios is expressed by an equation, the fifth expansion region 37 = the sixth expansion region 38> the fourth expansion region 36 > the seventh expansion region 39.

  Specifically, the extension stress at 65% at the maximum extension of the fourth stretch region 36 is 38 to 42 mN / mm, the extension stress at 65% at the maximum extension of the fifth stretch region 37 is 8 to 20 mN / mm, It is preferable that the extension stress at 65% when the 6 stretch zone 38 is fully extended is 42 to 48 mN / mm, and the extension stress when 65% when the 7 stretch zone 39 is maximum stretch is 1 to 4 mN / mm.

In addition, the elongation stress of each expansion / contraction area | region 36,37,38,39 can be measured by the method similar to the measuring method in the said 1st thru | or 3 expansion-contraction area | region 33,34,35. However, since the inner edge 19d extends obliquely inward of the diaper 10 in the seventh stretchable region 39, both ends thereof cannot be fixed to the chuck of the tensile tester. Therefore, a part located between the two seventh waist elastic elements 32 and a part located between the seventh waist elastic element 32 and the inner edge 19a are cut out from the seventh stretchable region 39 cut out from the product. Each sample is stretched in the same direction as the transverse direction Y of the diaper 10 using a tensile testing machine, and the stress value at a length of 65% at the maximum elongation is measured, and the total of those stress values Was defined as the elongation stress of the seventh stretchable region 39.

Thus, in order to set the extension stress and the extension magnification of the fourth to seventh stretch regions 36, 37, 38, 39, as the respective waist elastic elements 29, 30, 31, 32, the fourth waist elastic elements, respectively. 29 has a cross-sectional area of 550 to 650 dtex and an expansion ratio of 2.5 to 3.0 times, and the fifth waist elastic element 30 has a cross-sectional area of 500 to 550 dtex and an expansion ratio of 3.0 to 3.5 times. The sixth waist elastic element 31 has a cross-sectional area of 550-650 dtex and an expansion ratio of 3.0-3.5 times, and the seventh waist elastic element 32 has a cross-sectional area of 500-550 dtex and an expansion ratio of 1.8- A 2.4 times strand-like elastic element can be used.

  In the present embodiment, as illustrated, the pitch of the sixth waist elastic element 31 is larger than the pitch of the fourth waist elastic element 29, and the pitch of the fifth waist elastic element 30 is the pitch of the sixth waist elastic element 31. The pitch of the seventh waist elastic elements 32 is larger than the pitch of the fifth waist elastic elements 30. In this way, the pitch size may be adjusted in order to set the elongation stress of each of the stretchable regions 36, 37, 38, 39 so as to have the correlation. Moreover, the 4th thru | or 7th waist elastic elements 29, 30, 31, and 32 can also be formed with the same elastic element by adjusting the magnitude | size of a pitch. Furthermore, as long as each expansion / contraction area | region 36,37,38,39 has the said correlation, the expansion ratio of the 5th waist elastic element 30 located in the 6th expansion / contraction area 38 side is the expansion ratio of the 6th waist elastic element 31. The expansion ratio of the sixth waist elastic element 31 may be equal to the expansion ratio of the seventh waist elastic element 32.

  As described above, since the sixth stretchable region 38 extending on both sides of the rear end portion 48 of the absorbent panel 46 has a larger elongation stress than the other stretchable regions 36, 37, 39, the rear end portion of the absorbent panel 46. 48 adheres to a wearer's body and does not deviate from a desired position. Further, since the expansion ratio of the sixth expansion / contraction area 38 is larger than the expansion ratio of the fourth expansion / contraction area 36, the sixth expansion / contraction area 38 is not affected by the expansion / contraction of the fourth expansion / contraction area 36.

  Further, as shown in the drawing, the seventh waist elastic element 32 is smaller in number than the other waist elastic elements 29, 30, 31 and the elongation stress of the seventh elastic region 39 is the other elastic regions 36, 37, Since it is lower than 38, the required range of the wearer's buttocks can be covered, and a frill-like soft contact surface can be formed along the curved surface of the buttocks.

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

As shown in FIG. 5, the first waist elastic element 26 forming the first stretchable region 33 of the front waist region 13 crosses the front end flap 62 of the absorbent chassis 12 and the front end portion 47 of the absorbent panel 46. Thus, since the 1st expansion-contraction area 33 has crossed the front-end flap 62 of the absorptive chassis 12 , and the front-end part 47 of the absorptive panel 46, it prevents that a level | step difference arises in a part of the front waist area 13. FIG. be able to.

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 the wearer's body A. As shown in FIG. This is because the absorbent core 144 usually includes 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 116 a where the element 126 is disposed and is in close contact with the wearer's body A is separated from the liquid absorbent chassis 112. In particular, when the absorbent core 144 absorbs a large amount of urine, the thickness of the absorbent core 144 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 116a and the vicinity thereof forward of the wearer, so the front end flap 162 and the waist member facing it. 111 part is bent toward the space S, and as shown in FIG. 6 (b), the front end flap 162 and the part of the front waist member 111 opposite to the front end flap 162 are between the wearer's body A and the absorbent core 144. A gap R is generated in the meantime, resulting in a step R.

  Moreover, even if the waist elastic element 126 is disposed on the front end flap 162, the absorbent core 144 increases its thickness by absorbing a large amount of urine as described above. The front end portion 147 and the portion of the waist member 111 facing the front end portion 147 are shifted up on the front end flap 162 that is in close contact with the wearer's body A, and the front end flap 162 and the portion of the waist member 111 facing the front end flap 162 are shifted to the space S. Like the fallen state, that is, the state shown in FIG.

  Due to the step R, not only the diaper 110 is displaced from the desired position, but also the urine that the absorbent core 144 could not absorb could be accumulated in the step R and leaked to the outside. Is also not preferable.

  In particular, when the annular elastic waist panel 11 and the absorbent chassis 12 including the absorbent core 44 are formed separately as in the present embodiment, 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 44 is directly interposed inside the elastic waist panel 11. Compared with the diaper 10, such a level difference R is likely to occur.

In the present embodiment, since the first waist elastic element 26 is disposed across the front end portion 47 of the absorbent chassis 12, the front end flap 62 and the portion of the front waist panel 18 facing the front end flap 62 are shifted to the space S. In addition, the first waist elastic element 26 further crosses the front end portion 47 of the absorbent panel 46, so that the front end portion 47 of the absorbent panel 46 is in close contact with the wearer's body A due to the elongation stress. The upward movement is suppressed, and the step R does not occur in a part of the front waist region 13.

  Further, as described above, since the second stretchable areas 34 having a larger elongation stress than the first and third stretchable areas 33 and 35 extend on both sides of the front end 47 of the absorbent panel 46, the front end portion Both sides of 47 can be brought into close contact with the wearer's body A, and the first stretchable region 33 and the second stretchable region 34 cooperate to suppress the upward movement of the front end portion 47 of the absorbent panel 46. Can do.

  As described above, in order to bring the front end portion 47 of the absorbent panel 46 into close contact with the wearer's body A by the first stretchable region 33 and the second stretchable region 34, the rigidity of the absorbent core 44 is determined by the Taber method. It is preferable that it is 0.03-0.15 N * cm by measurement. When the rigidity of the absorbent core 44 is 0.15 N · cm or more, even if the extension stress of the first and second stretchable regions 33 and 34 is applied to the front end portion 47 of the absorbent panel 46, the portion is worn. This is because there is a possibility that the body A cannot be brought into close contact with the person.

  In addition, in order to give a desired elongation stress to each stretchable region 33, 34, 35, 36, 37, 38, 39, instead of arranging a strand-like elastic element as in this embodiment, elastic stretch The elastic sheet may be fixed to the inner surface of the annular elastic waist panel 11 or the sheet member constituting the annular elastic waist panel 11 may have elastic elasticity.

  Various components that are commonly used in this type of disposable diaper can be used without limitation for the constituent members forming the front and rear waist panels 18 and 19 and the absorbent chassis 12. Moreover, in this embodiment, although the cyclic | annular elastic waist panel 11 is comprised only from the front-and-back waist panels 18 and 19, it is located between the front-and-back waist panels 18 and 19 and the front-and-back waist panels 18 and 19, and it is a crotch. The crotch member which forms the area | region 15 may be sufficient, and the back-and-front waist panels 18 and 19 and the crotch member may be formed with the continuous sheet. Further, in addition to the pants-type disposable diaper in which both side edges 18c, 19c of the front and rear waist regions 13, 14 are connected in advance, the open type disposable in which both side edges 18c, 19c of the front and rear waist regions 13, 14 are not connected in advance. It can also be applied to diapers.

The perspective view of the disposable diaper concerning this invention. The expansion | deployment top view of a disposable diaper. Sectional view taken along line III-III in FIG. 2. The figure of the state which removed the absorptive chassis (except an absorptive panel) 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.

DESCRIPTION OF SYMBOLS 10 Disposable diaper 11 Elastic waist panel 12 Absorbent chassis 13 Front waist area 14 Rear waist area 15 Crotch area 16 Waist opening 17 Leg opening 18c Side edge 26 of front waist area 1st waist elastic element 27 2nd waist elastic element 28 3rd Waist elastic element 29 4th waist elastic element 30 5th waist elastic element 31 6th waist elastic element 32 7th waist elastic element 33 1st elastic region 34 2nd elastic region 35 3rd elastic region 36 4th elastic region 37 5th Stretch region 38 Sixth stretch region 39 Seventh stretch region 40A, 40B Non-stretch region 44 Absorbent core 46 Absorbent panel 46a Absorbent panel front edge 46b Absorbent panel rear edge 46c Absorbent panel side edge 47 Absorber Front end 48 of absorbent panel Rear end X of absorbent panel X Vertical direction Y Horizontal direction

Claims (4)

The longitudinal and lateral directions, the skin contact surface and the non-skin contact surface, the front waist region, the rear waist region, the crotch region located between the front and rear waist regions, and both side edges of the front and rear waist regions Are connected to and defined by a waist opening and a pair of leg openings, an annular elastic waist panel that forms the front and rear waist region, and a front and rear portion of the elastic waist panel, from the crotch region to the front and rear waist region In a disposable diaper comprising: an absorbent panel extending and having an absorbent core; and an absorbent chassis having front and rear end flaps extending from the front and rear end edges of the absorbent panel in the longitudinal direction;
At least the front waist region of the front waist region has at least a stretchable region extending in the lateral direction,
The stretchable region is adjacent to the first stretchable region, the first stretchable region extending in the lateral direction at the front end including the front end flap of the absorbent chassis from the edge of the waist opening, and the front waist region A pair of second stretches extending from the side edges to both sides of the front end portion of the absorbent panel and facing and spaced apart in the lateral direction on both sides of the first non-stretchable region formed in the laterally central portion of the front waist region And a pair of regions that extend from the side edge of the front waist region to both sides of the front end portion of the absorbent panel and that are spaced apart from each other in the lateral direction on both sides of the first non-stretchable region. Formed from the third stretchable region,
The first stretchable region crosses the front end of the absorbent panel ;
The correlation of the extension 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,
The said diaper characterized by the rigidity value by the Taber method of the said absorptive core being 0.03-0.15 N * cm . The longitudinal and lateral directions, the skin contact surface and the non-skin contact surface, the front waist region, the rear waist region, the crotch region located between the front and rear waist regions, and both side edges of the front and rear waist regions Are connected to and defined by a waist opening and a pair of leg openings, an annular elastic waist panel that forms the front and rear waist region, and a front and rear portion of the elastic waist panel, from the crotch region to the front and rear waist region In a disposable diaper comprising: an absorbent panel extending and having an absorbent core; and an absorbent chassis having front and rear end flaps extending from the front and rear end edges of the absorbent panel in the longitudinal direction;
The front and rear waist region has at least a stretchable region extending in the lateral direction,
The elastic waist panel has an extending portion extending from the side edge portion of the rear waist region to the crotch region side,
The stretchable region is adjacent to the first stretchable region, the first stretchable region extending in the lateral direction at the front end including the front end flap of the absorbent chassis from the edge of the waist opening, and the front waist region A pair of second stretches extending from the side edges to both sides of the front end portion of the absorbent panel and facing and spaced apart in the lateral direction on both sides of the first non-stretchable region formed in the laterally central portion of the front waist region And a pair of regions that extend from the side edge of the front waist region to both sides of the front end portion of the absorbent panel and that are spaced apart from each other in the lateral direction on both sides of the first non-stretchable region. Formed from the third stretchable region,
The first stretchable region crosses the front end of the absorbent panel;
The correlation of the extension 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,
A stretchable region in the rear waist region is adjacent to the fourth stretchable region, the fourth stretchable region extending in the lateral direction along the edge of the waist opening between both side edges of the rear waist region, and the absorption A fifth stretch region extending to the rear edge of the adhesive panel;
A pair of sixth stretchable regions adjacent to the fifth stretchable region and facing each other in the lateral direction on both sides of the second non-stretchable region formed at the lateral center of the rear waist region; It is divided into a pair of seventh stretch regions that are adjacent to the stretch region and that are spaced apart in the lateral direction on both sides of the second non-stretch region of the extension part of the elastic waist panel,
The correlation between the extension stresses of the fourth stretch region, the fifth stretch region, the sixth stretch region, and the seventh stretch region is as follows: sixth stretch region 38 ≧ fourth stretch region 36> fifth stretch region 37> first. The said diaper characterized by being 7 expansion-contraction areas. 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 formed from elastic elements having an equal expansion ratio. The diaper according to claim 1 or 2 . 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 . The diaper according to any one of 3 above.

Images