JP6479046B2 - Disposable diapers - Google Patents

Description

  This disclosure relates to disposable diapers.

  Conventionally, it has a front and rear waist region, a crotch region located between the front and rear waist regions, a diaper body having an absorber, a pair of waist belts for connecting the front and rear waist regions, a waist opening and a pair of leg openings Disposable diapers comprising are known. For example, in the disposable diaper disclosed in Patent Document 1, 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.

Japanese Patent Laid-Open No. 9-10261

  In the diaper described in Patent Document 1, as compared with a diaper in which the front and rear waist regions are formed by an annular waist belt and a diaper in which the front and rear waist regions and the crotch region are formed by an integral seat member, While giving a favorable impression, there is a problem that it is difficult to pull up the diaper when worn. In the diaper of Patent Document 1, the rigidity of the waist belt is almost uniform over the entire region, and when the diaper is pulled up by holding the waist belt when worn, the force applied to the waist belt expands the waist opening. Thus, the waist belt acts as a force that extends in the length direction, and the diaper is difficult to pull up.

  The present invention is an improvement of the prior art, and is to provide a disposable diaper that can be easily pulled up when worn.

  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. A disposable diaper comprising a diaper body, a pair of waist belts for connecting the front and rear waist regions, a waist opening and a pair of leg openings.

1st invention of this application WHEREIN: In the said diaper, the said pair of waist belt is the said diaper main body via the joint line in which the space | interval becomes small toward the said waist opening side from the said leg opening side in the said front-back waist area. A high-rigidity region having a higher rigidity than the other region of the waist belt, which extends in the direction around the waist, is located at the edge of the waist opening side of the waist belt , The waist belt has a waist sheet, the high rigidity region is formed by bending and fixing a part of the waist sheet to the inner surface side or the outer surface side, and the waist sheet is positioned on the skin facing surface. An inner layer, an outer layer located on the non-skin facing surface, and a plurality of waist elastic bodies attached between the inner and outer layers, and in the high rigidity region There are, the waist elastics do not overlap in the thickness direction of the waist sheet.
According to a second invention of the present application, in the above diaper, the pair of waist belts is configured such that, in the front and rear waist region, the diaper main body is connected via a joining line in which a distance from the leg opening side toward the waist opening side decreases. A high-rigidity region having a higher rigidity than the other region of the waist belt, which extends in the direction around the waist, is located at the edge of the waist opening side of the waist belt, The width dimension of the high-rigidity region differs in the length direction of the waist belt, and is maximized at a position overlapping the joining line.

  Since the waist belt further includes the high-rigidity area extending along the edge of the leg opening and having higher rigidity than other areas, the waist belt suppresses lifting at the edge of the leg opening, and excrement Side leakage can be prevented.

  Since both ends of the high-rigidity region are located in the joining line with the diaper main body, it is possible to prevent sheet tearing at the intersection of the waist belt and the diaper main body.

  Since the width dimension of the high rigidity region is 3 to 30 mm, the high rigidity region can be stably gripped when pulled up.

  According to one or more embodiments of the disposable diaper according to the present invention, the high rigidity region extending in the direction around the waist is located at the edge of the waist opening side of the waist belt. The diaper is easily bent at the boundary part with other regions, and when the diaper is worn, the waist belt can be easily pulled up by putting a finger on the boundary part.

  The drawings illustrate certain embodiments of the invention according to the present disclosure and include selective and preferred embodiments as well as essential configurations of the invention.

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 which extended the diaper to the vertical direction and the horizontal direction, and contact | abutted the inner surface of a waist belt and the inner surface of a diaper main body. 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 which shows the state at the time of wearing a diaper. The side view in the wearing condition of the diaper concerning the present invention. The figure which shows a part of manufacturing process of (a)-(d) diaper. (A) Sectional drawing which follows the X (a) line | wire of Fig.9 (a). (B) Sectional drawing which follows the X (b) line | wire of FIG.9 (d). The perspective view of the diaper in 2nd Embodiment. The expansion | deployment top view in the state which uncouple | bonded the joining line in the front-back waist area of the diaper in 2nd Embodiment, and extended the diaper main body and the waist belt to the vertical direction and the horizontal direction. The expansion | deployment top view in the state which uncouple | bonded the joining line in the front-back waist area of the diaper in 3rd Embodiment, and extended the diaper main body and the waist belt to the vertical direction and the horizontal direction.

  Each of the following embodiments relates to the disposable diaper shown in FIGS. 1 to 13 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, 12, and 13, each elastic body to be described later is applied to a 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. The resulting gathers are stretched to such an extent that they appear to be substantially lost by natural vision. In addition, it is expressed that the elastic body is attached so that it can shrink | contract in an expansion | extension state as a method, and it expresses that it is attached so that expansion | extension is conversely possible as an attachment state (thing). Therefore, the former should be understood to mean the latter as a result.

<First Embodiment>
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 layer 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, and a publicly known hot melt adhesive or the like is provided between the leak-proof sheet 24 and the inner layer sheet 21. 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 joint line 18A located in the front waist region 11 to the joint line 18B 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>
Referring to FIGS. 2 and 3, the waist belt 17 has both end edges (front and rear end edges) 17a and 17b joined to the diaper body 16 via joining lines 18A and 18B, and both side edges 16c and 16d of the diaper body 16. It has a lower edge 17c that forms a leg opening 15 and an upper edge 17d that forms a 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 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.

  Referring to FIGS. 2 to 4, the leg elastic body 26 and the upper waist elastic body 33 are arranged so as not to overlap each other in the thickness direction Z, so that the tensile force generated by the elastic bodies 26 and 33 on the joining line 18. Can be prevented from concentrating on one point, making it more difficult to break. Furthermore, in the plan view shown in FIG. 2, a part of the leg elastic body 26 is positioned outside the upper waist elastic body 33 in the lateral direction X, thereby effectively preventing the side leakage of excrement from the leg opening edge. Can be prevented.

  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 via an adhesive such as a hot melt adhesive 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.

  The region where the bent portion 36 is provided forms a high-rigidity region 50 having higher rigidity than other regions of the waist belt 17 (hereinafter referred to as the low-rigidity region 43). In the high rigidity region 50, the rigidity can be further increased by arranging another sheet or adjusting the pitch and the number of the upper waist elastic bodies 33 arranged in the bent portion 36. In the low-rigidity region 43, the region where the waist elastic sheet 35 is disposed is said to be higher in rigidity than the portion only from the inner and outer layers 31, 32, but the number of stacked sheets is less than the high-rigidity region 50, Since it can be said that the rigidity is lower than that of the high-rigidity region 50, it is assumed here as a part of the low-rigidity region 43.

  In the present embodiment, ten upper waist elastic bodies 33 are disposed in the upper portion 51 of the waist belt 17, and six upper waist elastic bodies 33 (arranged in the bent portion 36) disposed on the waist opening side. The elastic body including the elastic body has a thickness of 450 to 500 dtex and is fixed in a state of being stretched 3.0 to 3.5 times. 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.

  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. Further, by arranging the leg elastic sheet 27, a high rigidity region having a higher rigidity than that of the side sheet 25 is formed at the leg opening edge. Thus, by forming a high-rigidity region at the leg opening edge, it is possible to suppress the lift of the sheet at the leg opening edge and to prevent side leakage of excrement.

  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. In the center portion of the direction Y), by cutting with a cut line extending in the direction around the waist, the annular sample 1 corresponding to the upper portion of the front and rear waist regions 11, 12 and the lower portion of the front and rear waist regions 11, 12 An annular sample 2 is 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. 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 opening is smaller in the contracted state than in the expanded state. Since it does not become extremely small and it is easy to insert the leg into the leg opening, it can be smoothly worn without the tip of the leg getting caught in the leg opening. 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, the waist belt 17 has a length dimension L3 of the upper edge 17d larger than a length dimension L4 of the lower edge 17c when the diaper 10 is unfolded by peeling the joining line 18A. 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 a diaper through joint 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 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 in the intersection 61 of the boundary line 60 of the waist belt 17 and the diaper main body 16 which forms the inner edge of the joining line 18A, and a waist opening edge (it extends in parallel with the longitudinal centerline P). ) The intersection angle θ1, which is the intersection angle between the imaginary line 62 and the boundary line, is the difference between the imaginary 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 joint line 18B. It 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 lift the waist belt 17 and the force to pull the waist elastic bodies 33 and 34 in the direction around the waist. The stress concentrates at the intersections 61 and 63 between the waist opening and the joining line 18A, and the tearing is likely to occur. In the 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 even when such force is concentrated. It is possible to suppress the diaper 10 from being broken. Further, in order to prevent the breakage from the intersection points 61 and 63, the bonding area of the entire bonding lines 18A and 18B or the portion on the intersection points 61 and 63 side is made larger than that of other portions to locally increase the bonding strength. The sheet strength may be increased by attaching a reinforcing sheet to a region including the portion.

  Referring to FIG. 2, the dimension L2 in the longitudinal direction Y of the absorbent body 23 is about 65 to 95% of the dimension L1 in the longitudinal direction Y of the diaper 10 (diaper 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 diaper 10 has a curved shape such that the waist opening is convex downward as a whole. That is, since the position of the center part in the lateral direction of the front and rear waist regions 11 and 12 is located below the both side portions, the length dimension of the upper and lower areas is the same or the length dimension of the upper area is lower. Compared to a conventional diaper larger than the length of the side area, it can give a clean impression and is excellent in design.

  Referring to FIG. 7, since the high rigidity region 50 is located at the edge on the waist opening 14 side of the diaper 10, a finger is applied to the boundary between the high rigidity region 50 and the low rigidity region 43 when worn. The diaper 10 can be pulled up. The boundary portion is easy to bend due to a difference in rigidity, and the high rigidity region 50 is larger in thickness than the low rigidity region 43 and has a convex shape. Easy to hang. In a conventional diaper in which a high-rigidity area is not formed, there is no part to put a finger on, and when trying to pull up the waist belt, the waist opening expands more than necessary, and the lifting operation becomes difficult. In the diaper 10 of the present embodiment, since the high rigidity region 50 extends in the direction around the waist at the edge of the waist opening, the waist opening 14 can be prevented from spreading more than necessary when a finger is applied, and the waist The force for pulling up the belt 17 is easily transmitted to the entire diaper 10 along the circumferential direction, and the pulling operation is facilitated. Further, since the high rigidity region 50 extends to the joint line 18 of the front and rear waist regions 11 and 12, the unit on the end of the joint line 18A and 18B on the waist opening 14 side is a unit as compared with other parts of the joint line 18. The mass per area is increased, the bonding strength is increased, and the occurrence of tearing from the end can be prevented.

  Referring to FIG. 4 again, the width dimension W2 of the high rigidity region 50 is preferably in the range of about 3 to 30 mm, and more preferably in the range of about 5 to 20 mm. In the high rigidity region 50, the waist elastic body 33a located closest to the waist opening 14 is preferably disposed adjacent to the upper edge 17d.

  Referring to FIG. 8, the waist elastic sheet 35 gradually narrows from the both end portions 35A and 35B located on the joining lines 18A and 18B side toward the center portion 35C in the waist direction in the upper portion 51 of the leg opening 15. 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 side of the joining lines 18A and 8B toward the center portion (the narrowest width portion) 27C in the waist direction. The portion 27C is narrowest. Since the waist elastic sheet 35 and the leg elastic sheet 27 have such a shape, the both ends 27A, 27B, 35A, and 35B of both sheets located on the joining lines 18A and 18B side of the wearer's thigh The entire elastic sheet is formed with the same width by making the center part 27C, 35C abut the lower part of the body with the least movement and the outer part of the thigh while being stably fitted to the root. This makes it possible to achieve an appropriate fit to the body while suppressing the material cost compared to the case of doing so. 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.

  9A to 9D are diagrams illustrating a part of the manufacturing process of the diaper 10. Referring to FIG. 9 (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. Further, the continuous elastic sheet 79 is disposed so as to overlap a part of the continuous elastic body 77A and the continuous elastic body 77B.

  Referring to FIG. 9B, 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.

  Referring to FIGS. 9C, 9D, 10A, and 10B, in the thermal cutting process, a pair of portions where the main body 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.

Second Embodiment
11 is a perspective view similar to FIG. 1 of a diaper 10 according to the second embodiment, and FIG. 12 is a plan view similar to FIG. In FIG. 11 and FIG. 12, a dot is attached to a portion where the high rigidity region 50 is located. Since the basic configuration of the diaper 10 according to the present embodiment is the same as that according to the first embodiment, only differences will be described below.

  The waist belt 17 in the second embodiment includes a waist sheet 30 that forms its outer shape, and an auxiliary sheet (stiffened sheet) 80 disposed in the high rigidity region 50. The auxiliary sheet 80 is formed of an elastic stretchable or inelastic stretchable fiber nonwoven fabric, is located on the inner surface side and / or the outer surface side of the waistsheet 30, and on the edge of the waist opening 14 along the waist direction. The width dimension of the auxiliary seat 80 is different in the length direction of the waist belt 17. The width dimension of the auxiliary sheet 80 is preferably maximized at both ends in the length direction where the joining line 18 is located.

  Referring to FIG. 12, the minimum dimension M1 in the width direction of the auxiliary sheet 80 is preferably 3 mm or more, and the maximum dimension M2 is preferably in the range of 10 to 50 mm. Further, the dimension (the dimension of the high rigidity area 50 along the length direction of the joining line 18) N2 of the high rigidity area 50 on the joining lines 18A and 18B is about 10 to 10 times the length dimension N1 of the joining lines 18A and 18B. It is preferable that it is 50%. In the present embodiment, the width dimension of the high rigidity region 50 (that is, the width dimension of the auxiliary sheet 80) is the smallest on the horizontal center line Q. In this diaper 10, the joining strength of the diaper main body 16 and the waist belt 17 in the joining lines 18A and 18B can be increased. Furthermore, by reducing the width dimension in the region other than the joint portion, it is possible to reduce the member cost and to prevent the waist belt 17 from becoming unnecessarily high in rigidity and lowering the touch.

  In the first and second embodiments, the high rigidity region 50 only needs to be formed at least at the edge of the waist opening 14. The elastic body disposed in the high rigidity region 50 may be a belt-like or sheet-like elastic body instead of the upper waist elastic body 33 described above. In addition, well-known joining means, such as an adhesive agent, for example, a hot-melt adhesive agent, can be used for joining between the sheets in the high rigidity region 50. In addition, as long as the above-described effects of the present invention are exhibited, the waist sheet 30 constituting the waist belt 17 can be made of an elastic fiber nonwoven fabric made of elastomer fibers that does not have the waist elastic bodies 33 and 34. .

<Third Embodiment>
FIG. 13: is a top view in the state which extended | stretched to the vertical direction and the horizontal direction of a diaper, and contact | abutted the inner surface of a waist belt and the inner surface of a diaper main body. In FIG. 13, dots are attached to portions where the auxiliary sheet 90 is located. Since the basic configuration of the diaper 10 according to the present embodiment is the same as that according to the first embodiment, only differences will be described below.

  In the diaper 10 according to the present embodiment, auxiliary sheets (stiffened sheets) 90 are disposed at the front and rear end portions 20A and 20B located in the front and rear waist regions 11 and 12 of the diaper main body 16. The auxiliary sheet 90 is made of an elastic stretchable or non-elastic stretchable fiber nonwoven fabric, is located on the inner surface side and / or the outer surface side of the inner layer sheet 21, and at least from the waist opening end to the non-existing region of the absorber 23. It extends. As a result, the rigidity of the relatively low region where the absorber 23 does not exist between the joining lines 18A and 18B can be increased, and the boundary portion is lifted and gathers are formed due to the elastic difference and the rigidity difference with the waist belt 17. It is possible to reduce the gap between the body and the body. Furthermore, the auxiliary sheet 90 is preferably disposed so as to overlap the front and rear end portions of the absorber 23. Thus, by arranging the auxiliary seat 90 on the front and rear end portions 20A, 20B of the diaper main body 16, the elastic difference from the waist belt 17 and the rigidity difference between the existence area and the non-existence area of the absorber 23 are reduced. Suppression of sheet lift and wrinkles formed at each boundary portion can be suppressed, and a clean appearance like underwear such as shorts can be exhibited.

  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 Diaper 11 Front waist area 12 Rear waist area 13 Crotch area 14 Waist opening 15 Leg opening 16 Diaper main body 17 Waist belt 18A, 18B Joining line 26 Leg elastic body 30 Waist seat 31 Inner layer 32 Outer layer 33A, 33B Waist elastic body 50 High rigidity Area 80 Auxiliary sheet P Vertical center line X Horizontal direction Y Vertical direction

Claims (5)

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 through a joining line in which the distance from the leg opening side toward the waist opening side becomes smaller in the front and rear waist region.
In the edge part of the waist opening side of the waist belt, a high rigidity region having high rigidity as compared with other regions of the waist belt extending in the direction around the waist is located .
The waist belt has a waist sheet, and the high rigidity region is formed by bending and fixing a part of the waist sheet to the inner surface side or the outer surface side,
The waist sheet includes an inner layer located on a skin facing surface, an outer layer located on a non-skin facing surface, and a plurality of waist elastic bodies attached between the inner and outer layers,
In the high rigidity region, the waist elastic member, characterized in that does not overlap in the thickness direction of the waist sheet diaper. 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 through a joining line in which the distance from the leg opening side toward the waist opening side becomes smaller in the front and rear waist region.
In the edge part of the waist opening side of the waist belt, a high rigidity region having high rigidity as compared with other regions of the waist belt extending in the direction around the waist is located.
The diaper characterized in that the width dimension of the high-rigidity region is different in the length direction of the waist belt and is maximized at a position overlapping the joining line. 3. The diaper according to claim 1, wherein the waist belt further includes the high-rigidity region that extends along an edge of the leg opening and has higher rigidity than other regions. The diaper according to any one of claims 1 to 3, wherein both ends of the high-rigidity region are located in the joining line with the diaper main body. The diaper according to claim 2 , wherein a width dimension of the high rigidity region is 3 to 30 mm.

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