JPWO2016104752A1 - Disposable diapers - Google Patents

Abstract

A disposable diaper that is easy to expand the waist opening and that is stably held by the body. The disposable diaper has a pair of waist belts, and the waist belt is joined to the diaper main body through a joining line that approaches the longitudinal center line from the leg opening side toward the waist opening side in the front and rear waist region. At least one waist region of the front and rear waist regions has an upper region located on the waist opening side and a lower region located on the leg opening side, and in a state in which the waist belt is contracted, The length dimension is larger than the lateral length dimension of the upper section.

Description

  The present invention relates to a disposable diaper having a waist belt.

  Conventionally, disposable diapers having a waist belt are known. For example, Patent Literature 1 discloses a disposable diaper including a diaper body having an absorbent body and a pair of waist belts for connecting the front and rear waist regions. The waist belt is joined to the diaper main body through a joining line extending obliquely with respect to a longitudinal center line that bisects the lateral dimension of the diaper, and the waist belt includes a plurality of strips extending in the length direction thereof. The waist elastic body is arranged in a stretched state so as to be contractible.

JP 09-290003 A

  In the disposable diaper disclosed in Patent Document 1, the elongation stress at the waist opening side portion of the waist belt is higher than the elongation stress at the leg opening side portion. Since the pair of waist belts are respectively expanded and contracted in the direction around the waist between the front and rear joining lines, compared to a waist panel or the like that continuously extends in the direction around the waist, the force when stretched is easily dispersed. In order to expand the waist opening that has become smaller due to a high elongation stress, a relatively large elongation force is required, making it difficult to expand.

  Moreover, in such a diaper, since the waist elastic body does not exist in the central portion of the front and rear waist regions, the holding force for the body is relatively low, and the joining line is obliquely laterally outward from the waist opening toward the leg opening, In other words, since the length of the belt in the longitudinal direction is shorter on the leg opening side than on the waist opening side, in the waist belt, the elongation stress on the leg opening side is relatively lower than that on the waist opening side, so The waist belt cannot exert a required holding force on both sides of the end portion, and there is a possibility that displacement occurs when the absorbent body absorbs body fluid. Further, when the elongation stress on the leg opening side is increased, the leg opening becomes small due to the contraction of the belt, and it becomes difficult to insert the leg.

  Then, the subject of this invention is improvement of the conventional disposable diaper, Comprising: It exists in provision of the disposable diaper which is easy to expand a waist opening and is stably hold | maintained at a body.

  The present invention has a longitudinal direction and a lateral direction, and a longitudinal center line that bisects the dimension in the lateral direction, and includes a front and rear waist region, a crotch region located between the front and rear waist regions, and an absorber. The present invention relates to a disposable diaper including a diaper main body, a pair of waist belts for connecting the front and rear waist regions, a waist opening, and a pair of leg openings.

  In the diaper according to the present invention, the pair of waist belts are joined to the diaper main body via a joining line that approaches the longitudinal center line from the leg opening side toward the waist opening side in the front and rear waist region. And at least one of the front and rear waist regions has an upper region located on the waist opening side and a lower region located on the leg opening side, and the waist belt is contracted, The lateral length dimension of the lower section is larger than the lateral length dimension of the upper section.

  In the contracted state, the waist belt extends obliquely with respect to the longitudinal center line, and the waist opening edge has a downwardly curved shape, so that it has a clean appearance like underwear. And when it wears, it becomes easy to grasp and hold both sides of a diaper.

  The waist belt has a longitudinal direction, a lower part located in the lower area and an upper part located in the upper area, and in an extended state, the length dimension of the upper part is the length of the lower part. Because it is larger than the size, it does not compress the wearer's abdomen on the waist opening side, and on the leg opening side, it fits in the thigh of the wearer without any gaps and prevents excrement leakage. it can.

  Since the extensional stress in the lateral direction of the lower part is larger than the extensional stress in the lateral direction of the upper part, the leg can be stably fitted to the body on the leg opening side, and excrement leakage can be prevented. .

  The waist belt includes a plurality of waist elastic bodies extending in the longitudinal direction, and the waist elastic body includes the upper waist elastic body disposed in the upper portion and the lower waist disposed in the lower portion. The lower waist elastic body has a lower expansion ratio than the upper waist elastic body, so that the leg opening does not become extremely small in the contracted state, and the leg is the leg opening edge. Can be worn smoothly without being caught by

  Since the difference in expansion ratio between the upper waist elastic body and the lower waist elastic body is at least 0.5 times or less, there is no great difference in the degree of expansion and contraction in the waist elastic region. The shape does not change greatly.

  Since the thickness of the lower waist elastic body is larger than the thickness of the upper waist elastic body, the extension force of the lower waist elastic body is increased, and the fit to the body can be improved on the leg opening side.

  In the lower part of the waist belt, an elastic sheet extending along the leg opening edge is disposed, so that the leg opening edge fits in a planar shape and suppresses excrement from leaking from the gap. it can.

  In the state where the waist belt is extended, the length dimension of the lower part is 50 to 80% of the length dimension of the upper part, so that the fit to the body is improved on the leg opening side. Can do.

  According to the disposable diaper according to the present invention, since the pair of waist belts is connected to the diaper main body via a joining line extending obliquely with respect to the longitudinal center line, in the diaper manufacturing process, in the transport direction of the diaper main body. Since it can assemble by supplying a waist belt along, it is simple in structure, can be manufactured easily, and can be provided to consumers at low cost. Further, in the natural state of the diaper, the length dimension of the first area located on the waist opening side of the waist belt is smaller than the length dimension of the second area located on the leg opening side, so that the leg opening is formed large. There is no risk that the leg will get caught on the edge of the leg opening when worn.

The perspective view of a diaper shown as an example of the disposable diaper in 1st Embodiment of this invention. The top view in the state where it was extended in the vertical direction and the horizontal direction of a diaper, and the inner surface of a waist belt and the inner surface of a diaper main part were contacted. The expansion | deployment top view in the state which uncouple | bonded the joining line in the front-and-rear waist area of a diaper, and extended the diaper main body and the waist belt to the vertical direction and the horizontal direction. Sectional drawing which follows the IV-IV line | wire of FIG. (A) The partial enlarged view of the area | region enclosed by the V (a) line | wire of FIG. (B) The elements on larger scale of the area | region enclosed with the V (b) line | wire of FIG. The front view of the diaper of the state which shrunk in the aspect which the inner surface of the front waist area and the inner surface of the rear waist area contact | abutted mutually. The front view of the diaper in a wearing condition. The figure which looked at the diaper from the waist opening side. The side view of a diaper in a wearing condition. The figure which shows a part of manufacturing process of (a)-(d) diaper. (A) Sectional drawing which follows the XI (a) line of Fig.10 (a). (B) Sectional drawing which follows the XI (b) line of FIG.10 (d).

  Each of the following embodiments relates to the disposable diaper shown in FIGS. 1 to 11 as an example of the present invention, and includes not only an indispensable configuration of the invention but also a selective and preferable configuration. 2 to 4, each elastic body to be described later is naturally gathered on the member to which each elastic body is attached by the contracting force in the lateral direction X and the longitudinal direction Y against the contracting force. It is in a state of being stretched to such an extent that it appears to be substantially lost visually.

  1 to 3, a diaper 10 as an example of a disposable diaper according to the present invention includes a longitudinal direction Y and a transverse direction X orthogonal thereto, a skin facing surface and a non-skin facing surface on the opposite side, and a lateral direction. A longitudinal center line P that bisects the length dimension in the direction X and a lateral center line Q that bisects the length dimension in the longitudinal direction Y; a front waist region 11; a rear waist region 12; And a crotch region 13 located between the front waist region 11 and the rear waist region 12. The diaper 10 is substantially symmetric with respect to the longitudinal center line P, and has a waist opening 14 and a pair of leg openings 15.

  The diaper 10 includes a diaper main body 16 having an absorber 23 and extending in the longitudinal direction Y, and a pair of waist belts 17 for connecting the front and rear waist regions 11 and 12. The pair of waist belts 17 is arranged substantially symmetrically with respect to the longitudinal center line P, and is formed of a plurality of independent seal portions that approach the longitudinal center line P from the leg opening 15 side toward the waist opening 14 side. It joins to the diaper main body 16 via line (seal line) 18A, 18B. The seal portion is applied by a known joining means, for example, various heat welding means such as hot embossing and sonic processing. As for the waist belt 17, the skin opposing surface and the skin opposing surface of the diaper main body 16 are mutually fixed in joining line 18A, 18B. By having such a joining mode, the joining lines 18A and 18B do not touch the wearer's body and give a sense of incongruity or irritation. As long as the effects of the present embodiment described later can be obtained, known joining means such as a hot melt adhesive can be used for the joining lines 18A and 18B in addition to the heat welding means. The waist belt 17 is formed by a pair of elastic panels, but can be formed from the same sheet material as the diaper body 16 by a manufacturing method described later.

<Diaper body>
Referring to FIGS. 3 to 5, the diaper main body 16 is defined by a front end edge 16 a and a rear end edge 16 b that are separated from each other in the longitudinal direction Y, and both side edges 16 c and 16 d that are separated from each other in the lateral direction X. It has a front end portion 20A located between the front end edges 16a, a rear end portion 20B located between the rear end edges 16b, and an intermediate portion 20C located between the front and rear end portions 20A and 20B. The front and rear end edges 16a and 16b are substantially symmetrical with respect to the vertical center line P and extend in a convex shape toward the outside in the vertical direction Y. The front and rear end portions 20A and 20B are located in the front and rear waist regions 11 and 12 of the diaper 10, respectively, and the intermediate portion 20C is located in the crotch region 13.

  The diaper main body 16 includes a liquid-permeable inner layer sheet 21 located on the skin facing surface, a liquid-impervious outer layer sheet 22 located on the non-skin facing surface, and an absorbent body located between the inner and outer layer sheets 21 and 22. 23, and a liquid-impervious or liquid-impervious leak-proof sheet 24 positioned between the absorber 23 and the outer layer sheet 22. On both sides of the inner and outer layer sheets 21, 22, a pair of side sheets 25 that are spaced apart from each other in the horizontal direction X and extend in the vertical direction Y are disposed.

The inner layer sheet 21 has a substantially octagonal shape, and has a mass of about 15 to 35 g / m ² , preferably about 18 to 24 g / m ^2, a hydrophilically treated hydrophobic air-through fiber nonwoven fabric, spunbond fiber nonwoven fabric, and point bond fiber nonwoven fabric. Etc. are preferably formed. The outer layer sheet 22 is substantially the same shape and size as the inner layer sheet 21 and has a mass of about 15 to 30 g / m ² , preferably about 18 to 24 g / m ^2. It is preferably formed from a fiber nonwoven fabric or a spunbond fiber nonwoven fabric (referred to as SMS).

  The absorbent body 23 has front and rear end edges 23a and 23b that are curved outward in the vertical direction Y, and both side edges 23c that extend in the vertical direction Y between the front and rear end edges, and is a liquid absorption molded in a required shape. And a liquid diffusible core cover sheet such as tissue paper covering the liquid absorbent core. As the absorbent core, wood fluff pulp, superabsorbent polymer particles, or a mixture thereof can be used. The liquid-absorbent core and the core cover sheet can be joined to each other using a known joining means such as a hot melt adhesive.

  The leak-proof sheet 24 is disposed so as to cover at least the entire non-skin-facing surface (bottom surface) of the absorbent body 23, and a known joint such as a hot melt adhesive is interposed between the absorbent body 23 and the outer surface sheet 22. It can be joined by means. As the leak-proof sheet 24, for example, a liquid-permeable, preferably liquid-impervious and breathable plastic film can be used, and the leak-proof sheet 24 covers the entire non-skin facing surface of the absorbent body 23. Thus, the body fluid absorbed by the absorber 23 can be prevented from leaking to the outside of the diaper 10. Although not shown, the decorative element can be transmitted from the outer layer sheet 22 having a required light transmittance by using a sheet having decorative elements such as a pattern and a color as the leak-proof sheet 24.

Referring to FIGS. 4 and 5, the pair of side sheets 25 are disposed on both sides in the lateral direction X of the absorbent body 23. It is joined by the joining means. The side sheet 25 is formed of a first sheet 25A located on the absorber 23 side and a second sheet 25B located on the outer layer sheet 22 side, and both sheets 25A and 25B are joined by a known means such as a hot melt adhesive. Has been. As the side sheet 25, for example, a hydrophobic SMS fiber nonwoven fabric or spunbond fiber nonwoven fabric having a mass of about 10 to 30 g / m ² can be used.

  Further, between the outer edge of the first sheet 25A and the outer edge of the second sheet 25B, a plurality of leg elastic bodies 26 extending in the vertical direction and the skin facing surface side of the leg elastic bodies 26 are located. A leg elastic sheet 27 is disposed. The leg elastic body 26 is formed of a plurality of string-like or strand-like elastic materials attached so as to be contractible in the longitudinal direction Y between the front end edge 16a and the rear end edge 16b of the diaper body 16. . The leg elastic sheet 27 is a belt-like elastic member, and is formed from an elastic stretchable fiber nonwoven fabric formed from flat rubber or elastic fiber. By arranging the leg elastic body 26 and the leg elastic sheet 27 on both sides of the diaper main body 16, leg elastic regions 40 are formed on the outer side portions in the lateral direction X of the side edges 23 c of the absorber 23. The leg elastic region 40 extends from the front joint line 18 </ b> A located in the front waist region 11 to the rear joint line 18 </ b> B located in the rear waist region 12. In the present embodiment, the side sheet 25 is formed of two sheets 25A and 25B, but may be formed by bending and fixing a single fiber nonwoven fabric, or formed from an extended portion of the outer layer sheet 22. May be.

<Waist belt>
2 and 3, the waist belt 17 includes both end edges (front and rear end edges) 17a and 17b joined to the diaper main body 16 via front and rear joining lines 18A and 18B, and both side edges 16c and 16d of the diaper main body 16. A lower edge 17c that forms the leg opening 15 and an upper edge 17d that forms the waist opening edge. The waist belt 17 is divided into an upper portion 51 located on the waist opening side (first side edge side) and a lower portion 52 located on the leg opening side (second side edge side). The widthwise dimension of the upper part and the lower part is about 30 to 70% of the width dimension W1 of the waist belt 17 and preferably has a size of 50%. Therefore, for example, in the case of an M size of a normal adult diaper, the width dimension W1 of the waist belt 17 is about 70 mm, and the width dimension of the upper and lower portions 51 and 52 is about 35 mm.

  The waist belt 17 has inner and outer layers 31 and 32 formed from a waist sheet 30 made of a nonwoven fabric. Between the inner and outer layers 31, 32, a plurality of waist elastic bodies 33, 34 formed of a string-like or strand-like elastic material are attached so as to be contracted in an expanded state. The waist elastic bodies 33, 34 include an upper waist elastic body 33 disposed in the upper portion 51 and a lower waist elastic body 34 disposed in the lower portion 52.

  On the lower edge 17c side of the waist sheet 30, a waist elastic sheet 35 formed of an elastic fiber nonwoven fabric is disposed. The waist elastic sheet 35 is disposed so that a part thereof overlaps with the lower waist elastic body 34 located at the bottom. Further, the waist sheet 30 is fixed in a state where a part thereof is bent inward on the upper edge 17d side. A plurality of upper waist elastic bodies 33 are arranged in the bent portion 36. Moreover, the upper waist elastic body 33 arrange | positioned at the bending part 36 and the upper waist elastic body 33 arrange | positioned at main parts other than the bending part 36 of the waist sheet 30 have shifted | deviated in thickness direction, respectively. Preferably it is. Thereby, while avoiding the concentration of the extension stress due to the upper waist elastic body 33 overlapping in the thickness direction, the waist opening edge where the bent portion 36 exists has a higher extension stress as a whole than the other regions, Since the elastic force of the elastic body is exhibited up to the boundary between the joining lines 18A and 18B, high fit to the wearer's waist is realized, and the wearer's movement and excrement absorption due to weight loss is reduced. be able to. Furthermore, when the bent portion 36 is positioned at the edge of the waist opening, the light transmittance is locally lowered, and an appearance like underwear like shorts is exhibited.

  In the present embodiment, ten upper waist elastic bodies 33 are arranged on the upper portion 51 of the waist belt 17. The six upper waist elastic bodies 33 (including the elastic body arranged in the bent portion 36) arranged on the waist opening side have a thickness of 450 to 500 dtex and extend 3.0 to 3.5 times. It is fixed in the state. The four elastic bodies arranged on the leg opening side of the upper waist elastic body 33 have a thickness of 600 to 650 dtex and are fixed in a state of being stretched 2.5 to 3.0 times. Yes. Seven lower waist elastic bodies 34 are disposed in the lower portion 52, and the lower waist elastic body 34 has a thickness of 600 to 650 dtex and is fixed in a state of being stretched 2.5 to 3.0 times. Has been. The pitch (separation dimension) between each elastic body in the upper waist elastic body 33 and the lower waist elastic body 34 is equidistant, and is 5.0-6.0 mm. In addition, the thickness of the lower waist elastic body 34 is larger than the thickness of the upper waist elastic body 33 in order to increase the fit of the lower portion 52 located on the leg opening side in the front and rear waist regions 11 and 12 to the body. You may do it.

  As the leg elastic sheet 27, a belt-like elastic sheet made of an elastic stretchable fiber nonwoven fabric or a urethane sheet can be used. By arranging the leg elastic sheet 27 at the edge of the leg opening, the leg elastic region 40 fits in a planar shape to the wearer's body and can effectively prevent side leakage, and rubber marks due to the biting of the elastic yarn or the like Can be prevented.

  In the waist belt 17, the lower waist elastic body 34 and the leg elastic sheet 27 are arranged in the lower portion 52, so that the unit of the lower portion 52 is larger than the elongation stress in the lateral direction X per unit area of the upper portion 51. The elongation stress in the lateral direction X per area is high. Thus, by making the elongation stress of the upper portion 51 relatively low, the waist opening can be easily expanded when worn. On the other hand, since the extension stress of the lower part 52 is relatively high, it can be stably fitted to the wearer's body around the leg and can exhibit a required holding force. In particular, the diaper 10 is a so-called low-rise type that has a shallow crotch, where the width dimension of the waist belt 17 is smaller than the width dimension of the diaper body, and is easily displaced by the movement of the wearer during wear. Such a positional shift can be suppressed by being stably fitted to the body at 52.

<Method for measuring elongation stress>
The elongation stress of the upper part 51 and the lower part 52 was measured by the following method using a tensile tester manufactured by Instron Japan Company Limited. First, the absorbent body 23 is removed from the diaper 10, and the regions forming the front and rear waist regions 11 and 12 extending in the direction around the waist are cut out to obtain an annular elastic panel. By cutting along a cut line extending in the direction around the waist at the center portion in the direction Y), the annular sample 1 corresponding to the upper portion 11A of the front and rear waist regions 11 and 12, and the lower portion 11B of the front and rear waist regions 11 and 12 Are obtained, and the dimensions of the samples 1 and 2 in the contracted state are measured (K1, K2), respectively.

  First, when measuring the elongation stress of the sample 1, the separation distance between the upper and lower hooks of the tensile tester is adjusted so as to be the length dimension K1 in the contracted state of the sample 1, and the upper hook (fixing tool) is measured. One end of the sample 1 (the portion corresponding to the central portion 17f in the longitudinal direction of the waist belt 17 shown in FIG. 6), the other end of the sample 1 (the longitudinal length of the waist belt 17 shown in FIG. 6) on the lower hook (movable tool). A portion corresponding to the central portion 17e in the direction) is attached. In addition, before extending | stretching, the distance between hooks is finely adjusted so that extension stress may be set to 0.1N. Thereafter, the tensile tester is set to the cycle mode, and the upper hook is moved at a tensile speed of 300 mm / min. For example, for the sample 1 (upper part), when the dimension K1 at the time of contraction is 244 mm, the sample 1 is further extended 235 mm and then returned to the origin twice. And the return stress at the time of the second extension of 181 mm was measured and used as the extension stress of Sample 1. On the other hand, the elongation stress of Sample 2 was also determined by the same measurement method as Sample 1.

  According to the measurement results obtained by the above measuring method, the outbound stress of sample 1 was 1.082N and the outbound stress of sample 2 was 1.083N, both of which were substantially the same magnitude. Therefore, in the front and rear waist regions 11 and 12, the extension stress when stretched in the direction around the waist is substantially the same, and when worn, the entire front and rear waist regions 11 and 12 are expanded with a relatively small force. Can do. On the other hand, the return stress of Sample 1 was 3.476 N, and the return stress of Sample 2 was 4.557 N. Therefore, in a wearing state, it can be said that the leg opening side of the front and rear waist regions 11 and 12 fits the body more than the waist opening side.

  The lower waist elastic body 34 disposed in the lower portion 52 is attached at a lower expansion ratio than the upper waist elastic body 33 disposed in the upper portion 51. Specifically, the difference between the expansion ratio of the lower waist elastic body 34 and the expansion ratio of the upper waist elastic body 33 is 0.5 times or less. Specifically, the expansion ratio of the upper waist elastic body 33 is 3.2 to 3.7 times, and the expansion ratio of the lower waist elastic body 34 is 2.7 to 3.2 times. Since the difference in stretch magnification is 0.5 or less, deformation of the diaper 10 due to an extreme difference in stretch magnification between the upper and lower waist elastic bodies 33 and 34 can be suppressed in the contracted state. Further, in this way, by setting the expansion ratio of the lower waist elastic body 34 to be relatively low, the amount of contraction of the lower portion 52 is smaller than that of the upper portion 51, and the leg in the contracted state is larger than the expanded state. Since the opening does not become extremely small and the leg can be easily inserted through the leg opening, the leg can be worn smoothly without being caught in the leg opening when worn. In addition, by adjusting the leg elastic sheet 27 in the lower portion 52 instead of adjusting the pitch and number of the upper waist elastic body 33 and the lower waist elastic body 34, the size of the leg opening edge in the contracted state is reduced to the leg. The elastic sheet 27 is larger than the state in which the elastic sheet 27 is not arranged, the leg opening can be made larger, and further, the upper and lower parts 51 and 52 are set so as to cause a difference in elongation stress. Even when 52 has a relatively high elongation stress, it fits in a planar shape and the biting into the skin is suppressed.

  The thickness of the lower waist elastic body 34 is preferably larger than that of the upper waist elastic body 33. Thus, by setting the thickness of the lower waist elastic body 34 to be relatively large, it is possible to exert a relatively large elongation stress at a low magnification, and to realize the fit of the leg opening edge. it can.

  Referring to FIGS. 2 and 3, in the extended state in which the front joint line 18A is peeled and the diaper 10 is deployed, the waist belt 17 has an upper edge 17d having a length dimension L3 greater than a length dimension L4 of the lower edge 17c. Is large and trapezoidal. Specifically, for example, in a normal M size diaper, the length dimension (length dimension of the upper portion 51) L5 of the upper edge 17d of the waist belt 17 is 550 to 600 mm, and the length dimension of the lower edge 17c. (Length dimension of the lower part 52) L6 is 300 to 350 mm, and the dimension W1 in the width direction is 60 to 95 mm. Even in a state where the waist belt 17 is contracted, the length dimension L6 of the lower part 52 is smaller than the length dimension L5 of the upper part 51. In the state where the waist belt 17 is extended and contracted, the length dimension L6 of the lower part 52 is 50 to 80% of the length dimension L5 of the upper part 51.

  Referring to FIGS. 5 (a) and 5 (b), the waist belt 17 is connected via the front and rear joining lines 18A and 18B so that the first side edge 17c side is the leg opening edge side and the second side edge 17d side is the waist opening edge side. The diaper main body 16 is joined to the front and rear end portions 20A and 20B so as to be contractable in an extended state. In this embodiment, it intersects perpendicularly with the waist opening edge at the intersection 61 of the boundary line 60 and the waist opening edge between the waist belt 17 and the diaper main body 16 forming the inner edge of the front joining line 18A (in parallel with the longitudinal center line P) The intersection angle θ1, which is the intersection angle between the virtual line 62 and the boundary line, extends, and the virtual line 64 and the boundary line perpendicular to the waist opening edge at the intersection 63 of the boundary line and the waist opening edge forming the inner edge of the rear joint line 18B. Is the same as the intersection angle θ2. However, if necessary, the crossing angles θ1 and θ2 may be different from each other. In that case, the front side (abdominal side) and the rear side (back side) of the diaper 10 can be easily worn at the time of wearing. Can be identified.

  When the diaper 10 is worn, the wearer or the wear assistant concentrates the force to grip and pull up the waist belt 17 and the force to pull the waist elastic bodies 33 and 34 toward the waist. The stress is concentrated at the intersections 61 and 63 between the waist opening and the front joining line 18A, and the tearing tends to occur. In the pre-joining line 18A, since a plurality of sheets are joined and integrated by heat welding means instead of a hot melt adhesive, the rigidity is relatively high, and this force is concentrated. It can suppress that the diaper 10 is torn. Further, in order to prevent the breakage from the intersection points 61 and 63, the entire bonding area of the entire front and rear joining lines 18A and 18B or the portion on the intersection points 61 and 63 side is made larger than that of other portions, and the bonding strength is locally increased. The sheet strength may be increased by attaching a reinforcing sheet to a region including the portion.

  If FIG. 3 is referred, the dimension L2 of the longitudinal direction Y of the absorber 23 has a magnitude | size of about 65 to 95% of the dimension L1 of the longitudinal direction Y of the diaper 10 (diaper main body 16). Usually, the longitudinal dimension of the absorbent body is about 60% of the longitudinal dimension of the diaper, and is a portion formed only of a sheet member positioned on the outer side in the longitudinal direction from the absorbent body of the diaper. The area is relatively large. In the present embodiment, the absorbent body 23 has a length dimension sufficient to exhibit the required absorption performance, while comparing the area of the portion consisting only of the sheet member positioned outside in the longitudinal direction Y. By making it small, it can manufacture with fewer materials and can suppress manufacturing cost. Further, since the front and rear end edges 23a and 23b of the absorbent body 23 and the front and rear end edges 16a and 16b of the diaper main body 16 are closer to each other than a normal diaper, the waist opening is lower than the umbilicus part in the worn state. It becomes a clean wearing aspect with low rise like that.

  Referring to FIG. 6, the front waist region 11 has an upper region 11A located on the waist opening side and a lower region 11B located on the leg opening edge side. The waist belt 17 has an upper part 51 located in the upper area 11A and a lower part 52 located in the lower area 11B. Since the waist belt 17 is divided into two lengths to define the front and rear waist regions 11 and 2, the upper part 51 and the lower part 52 are respectively defined as the width dimension (vertical length) of the waist belt 17. The width dimension (dimension in the longitudinal direction Y) is almost half of the dimension in the direction Y). In addition, although the structure of the front waist area 11 is demonstrated below, the back waist area 12 also has the same structure except the case where it describes especially.

  In the state in which the diaper 10 is contracted, the length dimension (dimension in the lateral direction X) L6 of the lower section 11B of the front waist region 11 is larger than the length dimension (dimension in the lateral direction X) L5 of the upper section 11A. It has become. As described above, in the waist belt 17, the length dimension of the upper portion 51 is larger than the length dimension of the lower portion 52. However, in the front view or the rear view of the diaper 10, the lower region 11B is The waist belt 17 is longer than the upper area 11 </ b> A, extends obliquely with respect to the longitudinal center line P, and has a shape in which the waist opening edge is curved downward. In addition, the length dimensions L5 and L6 of the upper and lower side sections 11A and 11B were measured at the lowermost edge of each section 11A and 11B.

  Referring to FIG. 8, the waist elastic sheet 35 is gradually narrower in the upper portion 51 of the leg opening 15 from both end portions 35 </ b> A and 35 </ b> B located on the front and rear joining lines 18 </ b> A and 18 </ b> B toward the center portion 35 </ b> C in the waist direction. It is the narrowest in the central part (the narrowest part) 35C. Similarly, the leg elastic sheet 27 is gradually narrowed from both end portions 27A and 27B located on the front and rear joining lines 18A and 8B side toward the center portion (narrowest width portion) 27C in the waist direction, It is the narrowest in the central portion 27C. Since the waist elastic sheet 35 and the leg elastic sheet 27 have such a shape, the thighs of the wearer at both end portions 27A, 27B, 35A, and 35B of both sheets positioned on the front and rear joining lines 18A and 18B side. The entire elastic sheet is made to have the same width dimension by making the central portions 27C and 35C abut the vicinity of the hip bone with the least movement of the body and the outer portion of the thigh. A moderate fit to the body can be realized while suppressing the material cost compared to the case of forming. In addition, by displacing the narrowest part 35C of the waist elastic sheet 35 and the narrowest part 27C of the leg elastic sheet 27 slightly forward from the center part of the respective length dimensions, a wide area on the buttock side. Since the front portion of the leg opening is larger than the rear portion, the leg opening is closer to the line of the leg opening of the underwear, and it is easier to fit the body together with the underwear.

  Referring to FIG. 9, since the diaper 10 has such a shape, the leg opening extends outward in the lateral direction X from the waist opening as compared to the case where the waist belt 17 extends in parallel in the lateral direction. Therefore, when the diaper 10 is worn, it becomes easy to insert the toes. Further, since the waist opening edge has a shape that curves downward, it is easy to pull up the upper side of the waist belt 17 by gripping both sides protruding upward in the state where both legs are inserted into the leg opening. In addition, the width dimension W1 of the waist belt 17 is comparatively small, and is used for, for example, light incontinence of adults. It is of the waist type (low-rise type) and has a curved shape such that the waist opening is convex downward as a whole, that is, the position of the center part in the lateral direction of the front and rear waist regions 11 and 12 is Since it is located below both sides, it is cleaner than the conventional diaper where the length dimension of the upper and lower side sections are the same or the length dimension of the upper section is larger than the length dimension of the lower section. It is possible to give the impression that it is, and it is excellent in design.

  FIGS. 10A to 10D are diagrams illustrating a part of the manufacturing process of the diaper 10. Referring to FIG. 10 (a), in the composite panel 70 serving as the base material of the diaper 10, the side sheet 25 and the waist sheet 30 of the diaper main body 16 are integrally formed from a base sheet 71 made of a fiber nonwoven fabric. . The composite panel 70 includes a main body portion 73 serving as a base material of the diaper main body 16 on which the absorber 23 is disposed, and both side portions 74 serving as a base material of the waist belt 17 located on both sides of the main body portion 73. The base sheet 71 is attached to the both side portions 74 in a folded state, and continuous elastic bodies 77A and 77B forming the waist elastic bodies 33 and 34 and the leg elastic bodies 26 are arranged. In addition, a continuous elastic sheet 79 formed of an elastic stretchable fiber nonwoven fabric is disposed so as to overlap a part of the continuous elastic body 77A and the continuous elastic body 77B.

  Referring to FIG. 10B, next, a pair of elliptical slots 75 are formed between the main body portion 73 and the both side portions 74 and formed so as to extend in parallel with the absorber 23. . Further, a part of both side portions 74 is bent toward the main portion 73 along a bending line 76 extending so as to overlap the slot 75. The slot 75 can also be formed by making a straight cut into a part of the base sheet 71. In such a case, the sheet is likely to break from the cut end portion, and therefore, the slot 75 is predetermined by a hollowing process. Preferably, an opening having a width is formed. In the hollowed out part, the continuous elastic sheet 79 is located, and the continuous elastic sheet 79 is cut out, whereby the waist elastic sheet 35 and the leg elastic sheet 27 are formed. As described above, in the punching process, by arranging the leg elastic sheet 27 at the edge of the leg opening, it is possible to contact the wearer's thigh without any gap and suppress the leakage of excrement. In addition, the leg opening edge can suppress sheet lifting and gather formation compared to the case where only a plurality of waist elastic bodies or leg elastic bodies made of elastic yarns are arranged at intervals. A clean appearance can be exhibited.

  Referring to FIGS. 10C, 10D, 11A, and 11B, in the thermal cutting process, a pair of portions where the main portion 73 and both side portions 74 of the base sheet 71 are folded are paired. The diaper 10 can be manufactured by cutting along the thermal cutting line 78. The pair of thermal cutting lines 78 are positioned so as to face each other with the absorber 23 interposed therebetween, and have a substantially V shape extending obliquely from both end edges of the slot 75 toward both end edges of the base sheet 71. At the time of the thermal cutting process, the laminated constituent materials 71, 77A, 77B, 79 are joined together along the thermal cutting line 78 to form the joining lines 18A, 18B. A leg opening 15 formed by a slot 75 is defined between both side edges 16 c and 16 d of the diaper body 16 and the first side edge 17 c of the waist belt 17. Thus, by integrally forming the side sheet 25 and the waist sheet 30 of the diaper main body 16 from one base sheet 71, the manufacturing process can be simplified and the manufacturing cost can be reduced.

  In addition to the materials described in the present specification, various known materials that are usually used in this type of article can be used without limitation for the respective constituent members constituting the diaper 10. In the specification of the invention and the claims, the terms “first” and “second” are used merely to distinguish similar elements, positions, and the like.

DESCRIPTION OF SYMBOLS 10 Disposable diaper 11 Front waist area 11A Upper area 11B Lower area 12 Rear waist area 13 Crotch area 14 Waist opening 15 Leg opening 16 Diaper body 17 Waist belt 18A, 18B Joining line 23 Absorber 33 Upper waist elastic body 34 Lower waist elasticity Body 51 Upper part 52 Lower part P Vertical center line X Horizontal direction Y Vertical direction

Claims (9)

A diaper main body having a longitudinal direction and a lateral direction, and a longitudinal center line that bisects the lateral dimension, a front and rear waist region, a crotch region located between the front and rear waist regions, and an absorbent body; In a disposable diaper comprising a pair of waist belts for connecting the front and rear waist regions, a waist opening and a pair of leg openings,
The pair of waist belts are joined to the diaper main body via a joining line that approaches the longitudinal center line from the leg opening side toward the waist opening side in the front and rear waist region,
At least one of the front and rear waist regions has an upper region located on the waist opening side and a lower region located on the leg opening side, and in the state where the waist belt is contracted, the lower region The diaper characterized in that the lateral dimension of the side section is larger than the lateral dimension of the upper section.   The diaper according to claim 1, wherein in the contracted state, the waist belt extends obliquely with respect to the longitudinal center line, and the waist opening edge is curved downward.   The waist belt has a longitudinal direction, a lower part located in the lower area and an upper part located in the upper area, and in an extended state, the length dimension of the upper part is the length of the lower part. The diaper according to claim 1 or 2, wherein the diaper is larger than the size.   The diaper according to claim 3, wherein an extensional stress in the lateral direction of the lower part is larger than an extensional stress in the lateral direction of the upper part.   The waist belt includes a plurality of waist elastic bodies extending in the longitudinal direction, and the waist elastic body includes the upper waist elastic body disposed in the upper portion and the lower waist disposed in the lower portion. The diaper according to claim 3, wherein the lower waist elastic body has a lower expansion ratio than the upper waist elastic body.   The diaper according to claim 5, wherein a difference in expansion ratio between the upper waist elastic body and the lower waist elastic body is 0.5 times or less.   The diaper according to claim 5 or 6, wherein a thickness of the lower waist elastic body is larger than a thickness of the upper waist elastic body.   The diaper in any one of Claims 4-7 by which the elastic sheet extended along the said leg opening edge is arrange | positioned in the said lower part of the said waist belt.   The diaper according to any one of claims 3 to 8, wherein a length dimension of the lower part is 50 to 80% of a length dimension of the upper part in a state where the waist belt is extended.

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