JP5331239B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper having a diaper body having an absorbent body provided between a top sheet and a back sheet, and a side flap extending outward in the width direction from the diaper body.

  Conventionally, an open-type disposable diaper is provided as an absorbent article (see, for example, Patent Document 1). An open-type disposable diaper includes a diaper body having an absorbent body provided between a top sheet and a back sheet, and a back side that extends outward in the width direction from the diaper body at an outer end portion in the longitudinal direction of the diaper body. A side flap, and each member is provided in a deployed state.

  The dorsal side flap of the disposable diaper described in Patent Document 1 is provided with a fastening member that detachably fastens the dorsal side flap to the diaper main body. At both outer end portions in the width direction of the diaper main body, stretchable members constituting leg gathers are provided in a state that can be stretched in the longitudinal direction.

  When wearing a disposable diaper configured in this way, with the back side flap positioned on the back side of the wearer, the absorbent body is placed facing the crotch of the wearer, and then the back side flap is It draws toward the wearer's ventral side and stops the fastening member against the diaper body of the wearer's ventral side. By wearing in this way, the waist side of the wearer can be covered by the back side flap and the diaper main body, and the leg circumference of the wearer can be covered by the outer end portion in the width direction of the diaper main body. Moreover, the elastic member which comprises a leg gather is arrange | positioned in the outer end part in the width direction of a diaper main body, and can fit a diaper main body with respect to a wearer's leg periphery.

Special table 2000-513636 gazette (FIG. 1 etc.)

  However, the disposable diaper described in Patent Document 1 has the following problems.

  A crotch region that comes into contact with the wearer's crotch portion is provided at substantially the center in the longitudinal direction and the width direction of the disposable diaper. This crotch region is separated from the dorsal side flaps and the like worn around the wearer's waist. Therefore, when the body fluid or the like is discharged and the absorbent body becomes heavier, the crotch region may fall due to the weight of the body fluid or the like and be separated from the wearer.

  At this time, since the back side flaps and the diaper main body located at both outer ends in the longitudinal direction of the disposable diaper are joined by a fastening member or the like, the crotch region is lowered by the weight of the absorbent body. However, it is easy to maintain the state of being worn around the waist of the wearer.

  However, the elastic member arranged around the leg is separated from the side flap provided with the fastening member, and may be pulled down when the crotch region is lowered. When the elastic member is lowered, leg gathers are not formed around the wearer's leg, and the fit around the leg may be reduced. When the fit around the legs is reduced, a gap is formed between the wearer's legs and the disposable diaper, which may cause a side leak.

  Then, this invention aims at providing the disposable diaper which arranges the elastic member which constitutes leg gathers along a wearer's leg circumference, raises fit nature around a leg, and can control the occurrence of side leakage. To do.

  In order to solve the problems described above, a disposable diaper according to the present disclosure includes a liquid-permeable top sheet (top sheet 110), a liquid-impermeable back sheet (exterior sheet 120), the top sheet, and the back sheet. And an absorbent body (absorber 130) provided between and a plurality of stretchable members arranged on the outer side in the width direction than the absorbent body in a state of being stretched along the longitudinal direction of the absorbent body A diaper main body (diaper main body 10) and side flaps that extend outward in the width direction from the diaper main body at the outer end in the longitudinal direction of the diaper main body (back side flap 20 and ventral side flap 30) And a disposable diaper comprising a joint part (joint part 51, 53) for joining the side flap and the diaper main body, wherein the plurality of stretchable members (first stretchable member 1). 3a, 123b, 124a, 124b, the second elastic member 123c, 124c), the elastic member (first elastic member 123a, 124a) located on the outermost side in the width direction is extended along the longitudinal direction. The gist of the present invention is that it overlaps the joint in the thickness direction (thickness direction T) of the disposable diaper.

  The elastic member located at the outermost side in the width direction among the plurality of elastic members is disposed around the wearer's leg. The stretchable member on the outer side in the width direction overlaps in a state of being stretched with respect to a joint portion that joins the diaper body and the side flap. Therefore, when the side flap is pulled up, the stretchable member positioned at the outermost side in the width direction is pulled up together with the side flap.

  Even when the elastic member is lowered due to the weight of body fluid or the like, the entire elastic member can be pulled up to the side flap side by the side flap, and the elastic member can be arranged along the circumference of the wearer's leg. Therefore, the fitting property around the legs can be improved, the gap between the legs of the wearer and the disposable diaper can be reduced, and the lateral leakage of excrement can be suppressed.

It is a top view of the disposable diaper concerning a 1st embodiment. It is an assembly figure of the disposable diaper which concerns on 2nd Embodiment. It is sectional drawing in the A-A 'line of FIG. It is sectional drawing in the B-B 'line of FIG. It is sectional drawing in the C-C 'line of FIG. It is the perspective view which showed typically the deployment state of a disposable diaper. It is the perspective view which showed typically the mounting state of a disposable diaper. It is a figure for demonstrating the positional relationship of the fastening member of a side flap of a disposable diaper, and an elastic member. It is an assembly drawing explaining the disposable diaper which concerns on 2nd Embodiment.

(Disposable diaper according to the first embodiment)
The disposable diaper which concerns on 1st Embodiment is demonstrated referring drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

  Specific dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings. Moreover, in the following description, about the structure which has the same effect, the same number is attached | subjected and detailed description is abbreviate | omitted.

  FIG. 1 is a plan view of the disposable diaper 1 according to the first embodiment. FIG. 2 is an assembly diagram of the disposable diaper 1 shown in FIG. 1. FIG. 3 is a cross-sectional view of the disposable diaper 1 taken along the line A-A ′. FIG. 4 is a cross-sectional view of the disposable diaper 1 taken along line B-B ′. FIG. 5 is a cross-sectional view of the disposable diaper 1 taken along the line C-C ′.

  The disposable diaper 1 includes a diaper main body 10, a back side flap 20, and a ventral side flap 30. The back side flap 20 of the disposable diaper 1 is addressed to the back side around the wearer's torso. Further, the ventral side flap 30 is addressed to the ventral side around the wearer's torso. The diaper main body 10 is addressed to the wearer's inseam.

  The diaper main body 10 has a rectangular shape. The diaper main body 10 includes a liquid-permeable top sheet 110 disposed on the wearer side, an exterior sheet 120 as a non-liquid-permeable back sheet disposed on the clothing side, and the top sheet 110 and the exterior sheet 120. And the side sheets 141 and 142 provided on the outer side in the width direction of the absorber 130.

  The top sheet 110 is not particularly limited as long as it is a sheet-like material having a structure that allows liquid to permeate, such as a nonwoven fabric, a woven fabric, a perforated plastic sheet, and a mesh sheet. Either natural fibers or chemical fibers can be used as the woven or non-woven material.

Examples of natural fibers include cellulose such as pulverized pulp and cotton. Examples of the chemical fiber include regenerated cellulose such as rayon and fibril rayon, semi-synthetic cellulose such as acetate and triacetate, thermoplastic hydrophobic chemical fiber, or thermoplastic hydrophobic chemical fiber subjected to hydrophilic treatment. Examples of thermoplastic hydrophobic chemical fibers include single fibers such as polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET), fibers formed by graft polymerization of polyethylene and polypropylene, and composite fibers such as a core-sheath structure. Can be mentioned. For example, the surface sheet 110 is a point bond nonwoven fabric having a basis weight of 23 g / m ² .

  As a method for producing the nonwoven fabric, any one of a dry method (a card method, a spun bond method, a melt blown method, an airlaid method, etc.) and a wet method can be used. A plurality of methods may be combined among the dry method and the wet method. Moreover, methods, such as thermal bonding, needle punching, and chemical bonding, are mentioned. The method for producing the nonwoven fabric is not limited to the above-described method.

The exterior sheet 120 includes a back nonwoven fabric 121 that comes into contact with clothes, and a liquid-impermeable film (hereinafter referred to as a back film) 122 positioned on the skin side of the back nonwoven fabric 121. The back film 122 is made of a moisture permeable or moisture impermeable film. The back nonwoven fabric 121 is a hydrophobic nonwoven fabric composed of an SMS nonwoven fabric (a composite nonwoven fabric of a spunbond nonwoven fabric and a melt blown nonwoven fabric), a spunbond nonwoven fabric, and a point bond nonwoven fabric. The back nonwoven fabric 121 and the back film 122 are joined by a hot melt adhesive (hereinafter referred to as HMA) or the like. For example, the back film 122 is a non-breathable film having a basis weight of 16 g / m ² , and the back nonwoven fabric 121 is an SMS nonwoven fabric having a basis weight of 13 g / m ² .

  The absorber 130 includes an absorbent core 131 that absorbs liquid and an absorbent sheet 132. The absorbent core 131 includes a hydrophilic fiber and a superabsorbent polymer. Examples of hydrophilic fibers include pulverized pulp, cellulose such as cotton, regenerated cellulose such as rayon and fibril rayon, semi-synthetic cellulose such as acetate and triacetate, particulate polymer, fibrous polymer, thermoplastic hydrophobic chemical fiber, or A thermoplastic hydrophobic chemical fiber or the like subjected to hydrophilic treatment can be used alone or in combination. Among these, it is preferable to use pulverized pulp in consideration of low cost and ease of forming the absorber. You may use what mixed the polymer absorber with the hydrophilic fiber.

  The absorbent core 131 is wrapped with an absorbent sheet 132. In the present embodiment, the absorbent sheet 132 is a tissue. The absorber 130 is joined to the skin-side surface of the back film 122 with HMA or the like while being wrapped in the top sheet 110.

  The side sheets 141 and 142 are disposed on both sides in the width direction of the top sheet 110. The side sheets 141 and 142 are joined to the back nonwoven fabric 121 on the outer side in the width direction than the back film 122. Between the side sheets 141 and 142 and the back nonwoven fabric 121, a first elastic member described later is disposed.

  The side sheets 141 and 142 can be selected from the same material as that of the exterior sheet 120, for example. However, in order to prevent excrement such as urine and feces from flowing over the side sheets 141 and 142 to the outside in the width direction of the disposable diaper 1, it is preferable to have hydrophobicity or water repellency.

  A dorsal side flap 20 and a ventral side flap 30 are joined to both ends of the diaper body 10 in the longitudinal direction. The back side flap 20 is attached to at least the end region 10 </ b> A in the longitudinal direction L of the diaper main body 10. The back side flap 20 is longer than the width of the diaper body 10 and covers the end region 10A.

  The ventral side flap 30 is attached to the other end region 10 </ b> B in the longitudinal direction of the diaper main body 10. The ventral side flap 30 is longer than the width of the diaper body 10 and covers the end region 10B.

  The back side flap 20 and the ventral side flap 30 are made of a hydrophobic nonwoven fabric, a moisture-permeable or moisture-impermeable film, or a composite sheet obtained by bonding a hydrophobic nonwoven fabric and a moisture-permeable or moisture-impermeable film. . A film mainly composed of polyethylene, polypropylene, the like, a breathable resin film, a spunbond, a sheet in which a breathable resin film is bonded to a nonwoven fabric such as spunlace, and the like can be used.

The back side flap 20 and the ventral side flap 30 according to the present embodiment are made of an SMS nonwoven fabric having a basis weight of 15 g / m ² , and at least at the free ends 20A and 20B in the width direction of the back side flap 20 at the outer side in the width direction. It is folded back inward in the width direction with the end as a base point, and is overlapped on two sheets.

  Fastening members 41 and 42 are joined to the back side flap 20. The fastening members 41, 42 are attached to the free ends 20 </ b> A, 20 </ b> B located at both ends in the width direction of the back side flap 20. On the clothing contact surface side of the end region 10 </ b> B of the diaper main body 10, a locking portion 43 that locks the fastening members 41 and 42 is provided. The fastening members 41 and 42 are so-called male members of a hook-and-loop fastener, and the locking portion 43 is a female member.

The fastening members 41 and 42 are formed with an engaging surface having a plurality of hook-shaped projection groups (called hooks). Examples of the material for the fastening member include PPSB (polypropylene spunbonded nonwoven fabric). For example, PPSB having a basis weight of 80 g / m ² is preferably used. The basis weight of the hook is preferably 100 g / m ² .

The locking portion 43 to which the fastening members 41 and 42 are locked is a nonwoven fabric or a knitted fabric that can be engaged with the hook. A composite fiber having a core-sheath structure is used as the fibrous material constituting the nonwoven fabric. As the fibrous material, the core component / sheath component is, for example, a combination of PP (polypropylene) / PE (polyethylene), PP / low melting point PP, PET (polyethylene terephthalate) / low melting point PET, and PET / PE. You may mix fibers, such as polyamide, such as rayon, PET, PP, and nylon, acrylic, urethane, and cotton, with a fibrous material. For example, the basis weight of the female member is 38 g / m ² .

  The diaper main body 10 and the back side flap 20 are joined to each other by an adhesive such as HMA at the joint 51. The joint portion 51 is indicated by hatching in FIG. The joining portion 51 is configured so that the length in the longitudinal direction on the outer side in the width direction is longer than that on the center side in the width direction, and the center portion in the width direction is recessed toward the outer side in the width direction.

  In the diaper main body 10, a plurality of stretchable members are arranged in a state of being stretched along the longitudinal direction L of the absorbent body 130. The stretchable member is a first stretchable member 123a, 123b, 124a, 124b that forms a leg gather 13 (see FIG. 6) formed around the wearer's leg, and a leak-proof member disposed in the crotch portion of the wearer. And second elastic members 123c and 124c constituting the wall 15 (see FIG. 6). In addition, the 2nd elastic member is arrange | positioned at the inner side edge part in the width direction of the side seats 141 and 142, and functions as a side elastic member.

  The plurality of elastic members are arranged symmetrically about a virtual line EL that passes through the center in the width direction of the disposable diaper and extends in the longitudinal direction. The first elastic members 123a and 123b and the second elastic member 123c are arranged on one side with the virtual line EL as the central axis, and the first elastic members 124a and 124b and the second elastic member 123c are arranged on the other side. An elastic member 124c is disposed.

  The first elastic members 123a and 123b (first elastic members 124a and 124b) are arranged adjacent to each other in the width direction. Of the first elastic members 123a, 123b, 124a, and 124b, the first elastic members 123a and 124a arranged on the outer side in the width direction are arranged on the outermost side in the width direction among the plurality of elastic members. .

  The dorsal end region RA including the dorsal end portions 123ar, 123br, 124ar, and 124br of the first elastic members 123a, 123b, 124a, and 124b is connected to the joint portion 51 between the diaper main body 10 and the dorsal side flap 20. In the thickness direction T of the disposable diaper (in plan view shown in FIG. 1).

  Note that the state where the first elastic members 123a, 123b, 124a, 124b and the joint portion 51 overlap in the thickness direction means that the first elastic members 123a, 123b, 124a, 124b and the joint portion 51 are in contact with each other. This includes not only the state of overlapping in contact with each other but also the state of overlapping with the first elastic members 123 a, 123 b, 124 a, 124 b and the joint 51 sandwiching other members.

  In the back side end region RA, the first stretchable members 123a, 123b, 124a, 124b are attached to the diaper body 10 in a state of being stretched along the longitudinal direction L. Therefore, the elastic force of the first elastic members 123a, 123b, 124a, 124b acts in a direction in which the diaper main body 10 and the back side flap 20 contract in the longitudinal direction L.

  The diaper main body 10 and the ventral side flap 30 are joined to each other by an adhesive such as HMA at the joint portion 53. Similarly, the joint portion 53 has a ventral end region FA including ventral end portions 123af, 123bf, 124af, and 124bf of the first elastic members 123a, 123b, 124a, and 124b in the thickness direction T of the disposable diaper. Overlap (in plan view shown in FIG. 1).

  In the ventral side end region FA, the first stretchable members 123a, 123b, 124a, 124b are attached to the diaper main body 10 in a state of being stretched along the longitudinal direction L. Therefore, the elastic force of the first elastic members 123a, 123b, 124a, 124b acts in a direction in which the diaper main body 10 and the ventral side flap 30 contract in the longitudinal direction L.

  The first elastic members 123 a, 123 b, 124 a, 124 b are between the skin contact surface side surface of the back nonwoven fabric 121 and the non-skin contact surface side of the side sheets 141, 142 on the outer side in the width direction than the back film 122. In the state extended | stretched along the longitudinal direction L of the diaper main body 10, it is joined via adhesive materials, such as HMA.

  In the joint portion 51, the back side flap 20, the side sheets 141 and 142, and the back nonwoven fabric 121 are contracted in the longitudinal direction L by the first elastic member. Moreover, in the junction part 53, the abdominal side flap 30, the side sheets 141 and 142, and the back nonwoven fabric 121 are shrink | contracted in the longitudinal direction L with the 1st elastic member. And between the junction part 51 and the junction part 53, the side sheets 141 and 142 and the back nonwoven fabric 121 are contracted in the longitudinal direction L.

  The second elastic members 123c and 124c are arranged on the inner side in the longitudinal direction than the back side flap 20 and the abdominal side flap 30 and constitute the leak-proof walls 15 and 16. The second elastic members 123c and 124c are attached to the side sheets 141 and 142 in a state of being extended in the longitudinal direction L. The side sheets 141 and 142 are folded back inward so as to wind the second stretchable member at the inner end in the width direction. By providing the leak-proof walls 15, 16, excrement discharged from the wearer can be prevented from coming out of the side sheets 141, 142 in the width direction.

  Moreover, the both ends in the longitudinal direction of the side sheet are disposed between the side flap and the top sheet, and are joined to the side flap and the top sheet in a region overlapping the absorber in the thickness direction. Even when the body fluid or the like is discharged and the absorber becomes heavy, the absorber can be pulled up through the side sheet by the contraction force of the second stretchable member. Therefore, the crotch region of the disposable diaper is less likely to fall, and a gap between the disposable wearing article and the wearer's leg is less likely to occur.

  The first elastic members 123a, 123b, 124a, 124b according to the present embodiment are rubber having a diameter of 620 dtex. This rubber is arranged in a state of being stretched 2.2 times. The second elastic members 123c and 124c according to the present embodiment are rubber having a diameter of 620 dtex. This rubber is placed in a state of being stretched 2.5 times.

  Further, the joint portions 51 and 53 are provided up to a position of 3 mm on the outer side in the width direction than the elastic members (first elastic members 123a and 124a) located on the outermost side in the width direction. As described above, by providing the joint portions 51 and 53, even when a positional shift occurs when the back side flap 20 and the abdominal side flap 30 are transferred to the diaper main body 10, the expansion and contraction is reliably performed. The sex member can be placed on the joints 51, 53.

  In addition, a third stretchable member (not shown) that stretches in the longitudinal direction is provided on the inner side in the width direction than the second stretchable members 123c and 124c constituting the leak-proof wall and on the outer side in the width direction from the absorber 130. Also good. For example, the third stretchable member can be provided in a state of being stretched in the longitudinal direction between the back nonwoven fabric 121 and the back film 122. By disposing the third stretchable member, it is possible to suppress the absorbent body from drooping to the crotch when the body fluid is discharged, such as during urination, and to obtain a higher leg-around fit effect.

  In addition, it is desirable that the stretchable range in the longitudinal direction of the third stretchable member is shorter than that of the first stretchable member and does not cover the back side flap 20. For example, if the expansion / contraction range of the third elastic member extends to the back side flap 20, the absorbent body itself may be greatly contracted, making it difficult to wear the disposable diaper. Moreover, it is because there exists a possibility that a wear feeling may worsen by the absorber which shrink | contracted with respect to the wearer's crotch part, and the absorber's stiffness.

  FIG. 6 is a diagram schematically showing the deployed state of the disposable diaper 1. The unfolded state refers to a state where the back side flap 20 and the ventral side flap 30 are not joined as shown in FIGS. 1 and 6. FIG. 7 is a diagram schematically showing a state where the disposable diaper is attached to the wearer.

  As shown in FIG. 6, first stretchable members 123 a, 123 b, 124 a, and 124 b are disposed on the back side flap 20 and the abdominal side flap 30 in a state where they are extended in the longitudinal direction L. Therefore, the back side flap 20 and the abdominal side flap 30 are configured to be stretchable in the longitudinal direction L by the first stretchable members 123a, 123b, 124a, 124b in the deployed state.

  When wearing the disposable diaper 1 configured as described above, as shown in FIG. 7, the absorbent body 130 of the diaper main body 10 is brought into contact with the wearer's crotch, and the abdomen side flap 30 is placed on the wearer's crotch. The fastening members 41, 42 mounted on both side portions in the width direction of the back side flap 20 are fastened to the locking portions 43 of the ventral side flaps in a state of being in contact with the abdomen.

  In the state where the fastening members 41 and 42 are fastened to the locking portion 43 of the ventral side flap, the circumference of the wearer's waist is covered with the back side flap 20 and the ventral side flap 30. The dorsal side flap 20 and the ventral side flap 30 are joined by a fastening member or the like, and even when the crotch region is lowered due to the weight of the absorbent body, the back side flap 20 and the ventral side flap 30 are attached around the waist of the wearer. Maintained.

  Moreover, since the 1st elastic member is arrange | positioned in the state extended in the longitudinal direction in the junction part 51 of the back side flap 20 and the diaper main body 10, it pulls up a 1st elastic member to the side flap side. Can do.

  Specifically, the expansion / contraction effective range of the first elastic member reaches the back side flap 20, and the back side flap 20, which is a separate member from the diaper main body 10, is directly connected to the first elastic member. ing. Therefore, when the back side flap 20 is extended to the abdomen, the force interlocking from the back side flap 30 to the first stretchable member becomes high.

  For example, when the expansion / contraction effective range of the first elastic member is located on the inner side in the longitudinal direction than the back side flap 20, the back side flap 20 and the first elastic member are not directly connected. Therefore, when the back side flap 20 is extended, the force is divided between the expansion start position of the first elastic member and the back side flap 20, and the force from the back side flap 20 to the first elastic member is divided. The interlocking of becomes low.

  Even when a force that lowers the crotch region of the diaper main body 10 due to the weight of body fluid or the like is applied by overlapping the effective expansion / contraction range of the first elastic member on the back side flap 20, the expansion / contraction of the first elastic member It is possible to suppress the diaper main body from being lowered around the leg by force, and the first stretchable member can be arranged along the circumference of the wearer's leg. Therefore, the fit around the legs can be maintained, and the feeling of wearing can be improved while preventing side leakage.

  More preferably, the region of the back side flap where the first elastic member is disposed is preferably contracted by the first elastic member in the deployed state. For example, even if the effective range of expansion / contraction of the first elastic member is disposed on the back side flap, if the back side flap is not contracted by the first elastic member, the first elastic member contracts. The force that causes the back side flap 20 to be in close contact with the skin due to the force is difficult to work, and the fit around the legs may not be sufficiently improved.

  However, when the dorsal side flap is contracted by the first elastic member, the force of bringing the dorsal side flap 20 into close contact with the skin by the contracting force of the first elastic member works, and the diaper main body 10 and the dorsal side The fit around both legs of the side flap 20 can be improved.

  In addition, during the wearing of the diaper, the first stretchable member is subjected to a force pulled outward in the width direction by the back side flap 20 and always maintains the position of the first stretchable member in the direction of projecting to the outside of the body. be able to. Therefore, the position shift of the 1st elastic member by a wearer's leg | foot and the movement of a buttocks can be reduced, and the fitting property with respect to a body can be maintained in the stable state.

  Although the back side flap 20 is configured separately from the diaper main body 10, the back side flap 20 has a continuous sheet shape across the entire width direction of the diaper main body, and therefore has a width compared to the side flaps divided in the width direction. The tensile strength in the direction can be increased. Therefore, in order to increase the strength of the back side flap, it is not necessary to configure the back side flap 20 itself with a high weight material or a high rigidity material, and the flexibility of the back side flap 20 can be increased. By increasing the flexibility of the side flaps, it is possible to improve the feel when touching the skin and prevent the formation of hard wrinkles at the time of wearing.

  When the back side flap 20 is formed of a sheet that is continuous in the width direction, the portion of the back side flap that extends outward in the width direction from the diaper body is made higher than the portion that overlaps the diaper body. It is desirable. The central portion between the portions extending outward in the width direction from the diaper main body is a portion with which the wearer's buttocks abuts, and the flexibility of the portion can be enhanced. Further, by increasing the flexibility of the central portion of the back side flap, a pocket is easily formed between the back side flap 20 and the top sheet 110.

  In addition, the range of the longitudinal direction which overlaps with the expansion-contraction range of the 1st elastic member and the back side flap 20 has the preferable range of 3-23% with respect to the length of the longitudinal direction of the back side flap 20. FIG. For example, when it is longer than 23%, the back side flap 20 may be shrunk too much by the first elastic member. If the back side flap 20 is contracted too much in the longitudinal direction, the back side flap 20 becomes a string when the diaper is worn, and the diaper cannot be supported around the waist, and the diaper may be displaced.

  On the other hand, when the expansion / contraction range of the first elastic member is shorter than 3%, the overlapping region of the back side flap 20 and the first elastic member is narrow, and the back side flap 20 and the first elastic member The linkage is weakened. Therefore, the fit around the legs cannot be sufficiently increased.

  In the present embodiment, the length in the longitudinal direction overlapping the stretchable range of the first stretchable member and the back side flap 20 is about 18% with respect to the length in the longitudinal direction of the back side flap 20. . Specifically, the length of the back side flap 20 in the longitudinal direction is 110 mm, and the overlap length of the first stretchable member is 20 mm.

  Moreover, the non-joining parts 52 and 54 in which the side flap and the diaper main body are not joined are provided on the outer side in the width direction than the stretchable member located on the outermost side in the width direction. FIG. 8 is an enlarged view of the fastening member portion of the back side flap. Fig.8 (a) has shown the back side flap which concerns on this Embodiment, and FIG.8 (b) has shown the back side flap which concerns on a modification. The back side flap according to the modified example is not provided with the non-joining portions 52 and 54 outside the joining portion in the width direction.

  Since the fastening member is disposed on the outer side in the width direction of the diaper main body, the force transmitted from the fastening member to the diaper main body acts in the vicinity of the outer end in the width direction of the diaper main body. Therefore, it is easy to transmit the force from the fastening member or the side flap to the stretchable member located on the outermost side in the width direction. However, if the joint portion is provided on the outer side in the width direction than the stretchable member located on the outermost side in the width direction, the force from the fastening member acts on the joint portion and is less likely to act on the stretchable member.

  Specifically, the force applied to the diaper main body from the fastening member of the back side flap 20 when the diaper is mounted is applied to the portion PA located on the fastening member side of the joint. At this time, as shown in FIG. 8A, when the non-joined portion is provided, the portion located on the fastening member side of the joined portion and the first stretchable member are close to each other, and the first stretchable property is obtained. The first elastic member can be interlocked with the back side flap by efficiently applying a force from the fastening member to the member.

  On the other hand, as shown in FIG. 8B, when the non-joined portion is not provided, the portion PA located on the fastening member side of the joined portion and the first stretchable member are separated from each other. The force applied from the attachment member is distributed to the portion PA located on the fastening member side of the joining portion and the first elastic member, and is not effectively applied to the first elastic member.

  Therefore, it is desirable that a non-joining portion is provided on the outer side in the width direction than the stretchable member located on the outermost side in the width direction. By providing a non-joining part, the force from a side flap can be efficiently transmitted to an elastic member, and an elastic member can be pulled up with raising of a side flap.

(Method for manufacturing disposable diapers)
Next, an example of the manufacturing method of the disposable diaper 1 is demonstrated. Note that an existing method can be used as a method not described in this embodiment. Moreover, the manufacturing method demonstrated below is an example and can also be manufactured with another manufacturing method. The manufacturing method of the disposable diaper 1 includes a folding step, a fastening member attaching step, a first cutting step, a flap attaching step, and a second cutting step.

  In a 1st folding process, the both-sides edge part of the continuous side flap sheet | seat which comprises a back | dorsal side flap and an abdominal side flap is folded in the width direction center side. As a result, overlapping portions in which a plurality of side flap sheets are overlapped are formed at both ends of the side flap sheet. The overlapping portions constitute, for example, free ends 20A and 20B of the back side flap 20.

  In the fastening member attaching step, the fastening members 41 and 42 are attached to the free ends 20A and 20B of the back side flap 20. In the first cutting step, the flap sheet is cut at predetermined intervals along a crossing direction orthogonal to the transport direction. The cut piece is obtained by integrating the back side flap 20 and the ventral side flap 30.

  In a flap sticking process, a cut piece is joined on an absorptive body sheet which an absorptive body continues. In the second cutting step, the absorbent main body sheet is cut along the crossing direction. The cut piece is separated into a ventral side flap of one product and a dorsal side flap of the product following the one product. The disposable diaper 1 is completed by the above process.

  Thus, a trim is not discharged at the time of diaper manufacture by joining a back side flap and a ventral side flap to an absorptive main part, and manufacturing a disposable diaper. Since no extra material is used, a product can be produced at a low cost and the burden on the environment can be reduced. Moreover, as above-mentioned, a 1st elastic member can be made to fit around a wearer's leg, and the fitting property like a pants-type diaper can be maintained, suppressing discharge | emission of excess material.

(Second Embodiment)
Next, the disposable diaper 2 which concerns on the modification of 2nd Embodiment is demonstrated using FIG. In the following description of the embodiment, only the configuration different from that of the first embodiment will be described, and the description of the same configuration as that of the first embodiment will be omitted by using the same reference numerals.

  In the disposable diaper 2, side flaps are prepared as left and right separate parts, and the end regions 10A and 10B are not completely covered by the back side flaps and the ventral side flaps. That is, the disposable diaper 2 has the back side flaps 22 and 24. In addition, ventral side flaps 32 and 34 are provided. The back side side flap 22 is joined to the diaper main body 10 by the joining portion 55. The back side flap 24 is joined to the diaper main body 10 by the joining portion 56. Further, the ventral side flap 32 is joined to the diaper main body 10 by the joining portion 57. The ventral side flap 34 is joined to the diaper main body 10 by the joining portion 58. Also in the disposable diaper 2, the same effect as the disposable diaper 1 is acquired.

(Other embodiments)
Although the contents of the present invention have been disclosed through the embodiments of the present invention as described above, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  In the present embodiment, the disposable diaper 1 in which the back side flap 20 and the ventral side flap 30 are attached to the diaper main body 10 has been described. However, the form of the disposable diaper is not limited to this embodiment. For example, an open-type disposable in which a waist area corresponding to the wearer's waist and a crotch area corresponding to the crotch are integrated, and an opening of the wearer's leg is hollowed out. It may be a diaper or may not have a ventral side flap. The disposable diaper 1 may be for infants, infants, and adults.

  In this Embodiment, although the 1st elastic member is arrange | positioned in the expansion | extension state in the junction part of a ventral side flap and a diaper main body, a 1st elastic member is joining of a ventral side flap and a diaper main body. It may be arrange | positioned in the longitudinal direction inner side from the part, and may be arrange | positioned in the non-expanded state in the junction part of an abdominal side flap and a diaper main body.

  Although the non-joining part is provided in the width direction outer side rather than the junction part, the structure by which the non-joining part is not provided in the width direction outer side than the junction part may be sufficient as the disposable diaper which concerns on this Embodiment. .

  In the disposable diaper according to the present embodiment, only the both ends in the width direction of the disposable side diaper are formed with a higher basis weight than the center part, but the basis weight may be uniform in the entire region of the back side flap. And the fabric weight of a center part may become high rather than the width direction both ends.

  In the present embodiment, the plurality of first elastic members 123a, 123b, 124a, and 124b are configured to overlap with the bonding portion 51 in the thickness direction, but the present invention is not limited to this configuration. Specifically, among the plurality of elastic members, the elastic member (in the present embodiment, the first elastic members 123a and 124a) arranged on the outermost side in the width direction overlaps with the joint portion 51. It is sufficient that only the first stretchable members 123 a and 124 a overlap with the joint portion 51, or three or more including the first stretchable members 123 a and 124 a overlap with the joint portion 51. May be arranged.

  As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is determined only by the invention specifying matters according to the scope of claims reasonable from the above description.

  The examples and comparative examples were given to measure the bending rigidity and the bend recovery property indicating the bending characteristics of the fastening member and the side flap, and the suitability of each material as the fastening member and the side flap was evaluated. In addition, this invention is not limited by these.

  Using the materials according to Example 1 and Example 2 and the materials according to Comparative Example 1 and Comparative Example 2, the bending stiffness and the bending recoverability indexing the bending characteristics are measured, and as a fastening member for each material Was evaluated for appropriateness. Appropriate evaluation of the fastening member was evaluated based on hardness and difficulty of shifting.

  In the case of hardness that is in contact with the wearer's skin and does not feel uncomfortable, it was indicated as “◯”, and in the case where there was a possibility that discomfort might occur, it was indicated as “x”. When it was used as a fastening member and there was no deviation from the dorsal side flap or the ventral side flap, it was marked as “◯”, and when deviation occurred, it was marked as “X”.

  Further, using the materials according to Example 3 and Example 4 and the materials according to Comparative Example 3 and Comparative Example 4, the bending rigidity and the bending recovery property indicating the bending characteristics are measured, and the side flaps of each material are measured. Was evaluated as appropriate. Appropriate evaluation as a side flap was evaluated by hardness and difficulty of tearing.

  In the case of hardness that is in contact with the wearer's skin and does not feel uncomfortable, it was indicated as “◯”, and in the case where there was a possibility that discomfort might occur, it was indicated as “x”. When it used as a back side flap and it was not torn, it was set as “◯”, and when it was torn, it was marked as “x”.

(Measurement method of bending stiffness and bending recovery)
Bending rigidity and bending recovery were measured by the KES method. As a measuring instrument, KES FB-2 was used. First, a sample of 100 mm in length and 30 mm in width is collected for each material. The vertical is taken along the conveying direction in the material manufacturing process, and the horizontal is taken along the intersecting direction perpendicular to the conveying direction. After zeroing the measuring device, set the sample so that it bends in the vertical direction and starts measurement. Record the B-2HB value displayed on the screen of the measuring instrument. Next, the sample is set so as to bend in the horizontal direction and the measurement is started. Record the B-2HB value displayed on the screen of the measuring instrument.

The bending stiffness is calculated by the equation shown in Equation 1.

The bending recovery property is calculated by the equation shown in Equation 2.

(Measurement result)
The measurement results are shown in Table 1. In the present embodiment, the third decimal place of the measured value is rounded off to the second decimal place.

The material according to Comparative Example 1 is obtained by laminating both surfaces of a fabric weight 80 g / cm ² polypropylene spunbond nonwoven fabric. Flexural rigidity and flexural recovery are the highest among the four materials. Since the material is hard, it was evaluated as unsuitable as a fastening member.

The material according to Comparative Example 2 is a 30 g / cm ² polypropylene spunbond nonwoven fabric. Flexural rigidity and bend recovery are the lowest of the four materials. Since the material was soft and misaligned, it was evaluated as unsuitable as a fastening member.

Material according to Example 1 is basis weight 80 g / cm ² polypropylene spunbond nonwoven. It evaluated that it was suitable as a fastening member in hardness and the difficulty of shift | offset | difference.

Materials according to the second embodiment, a basis weight of 60 g / cm ² polypropylene spunbond nonwoven. It evaluated that it was suitable as a fastening member in hardness and the difficulty of shift | offset | difference.

These results, bending stiffness of the fastening member is preferably in the range of ^{0.56 × 10 -4 Nm / m~0.68 ×} 10 -4 Nm / m, flexural recovery property of the fastening member 0.52 × 10 ⁻² Nm / m to 0.74 × 10 ⁻² Nm / m.

The material according to Comparative Example 3 is a 20 g / cm ² polypropylene spunbond nonwoven fabric. Flexural rigidity and flexural recovery are the highest among the four materials. Since the material was hard, it was evaluated as unsuitable as a back side flap.

The material according to Comparative Example 4 is an SMS nonwoven fabric having a basis weight of 15 g / cm ² . Flexural rigidity and bend recovery are the lowest of the four materials. Since the material was softly torn, it was evaluated as unsuitable as a back side flap.

The material according to Example 3 is a 30 g / cm ² polypropylene spunbond nonwoven fabric. In terms of hardness and resistance to tearing, it was evaluated as appropriate as a dorsal side flap.

As for the material which concerns on Example 4, the sheet weight 15g / cm < ² > SMS nonwoven fabric is piled up two sheets. It evaluated that it was appropriate as a back side flap in hardness and the difficulty of slippage.

From the above results, it is desirable that the bending rigidity of the back side flap is 0.07 × 10 ⁻⁴ Nm / m, and the bending recovery property of the back side flap is 0.07 × 10 ^{−2 to} 0. A range of 08 × 10 ⁻² Nm / m is desirable.

If the side flap bending stiffness is less than 0.07 × 10 ⁻⁴ or the bending recovery property is less than 0.07 × 10 ⁻² , the strength of the side flap is insufficient, and when wearing a diaper There is a risk that the side flaps may be broken or the side flaps may be turned over.

On the other hand, if the bending rigidity of the side flaps is greater than 0.07 × 10 ⁻⁴ or the bend recovery is greater than 0.08 × 10 ⁻² , wrinkles will occur when the side flaps expand and contract by the elastic member. There is a risk that irritation to the skin will be formed.

  DESCRIPTION OF SYMBOLS 1 ... Disposable diaper, 10 ... Diaper main body, 10A, 10B ... End area | region, 13, 14 ... Leg gather, 15, 16 ... Leak-proof wall, 20 ... Back side side flap, 20A, 20B ... Free end, 30 ... Belly Side side flaps, 41, 42 ... fastening members, 51, 53 ... joints, 110 ... surface sheet, 120 ... exterior sheet, 121 ... back nonwoven fabric, 122 ... back film, 123a, 123b, 124a, 124b ... first stretch 123c, 124c ... second elastic member, 130 ... absorbent, 131 ... absorbent core, 132 ... absorbent sheet, 141, 142 ... side sheet

Claims (3)

The liquid-permeable top sheet, the liquid-impermeable back sheet, the absorber provided between the top sheet and the back sheet, and the stretched state along the longitudinal direction of the absorber A diaper body having a plurality of stretchable members arranged on both sides on the outer side in the width direction from the absorbent body;
In one of the longitudinal direction of the outer end portion of the diaper body, and the back side flap where the diaper to extend in the width direction outer side than the body, is arranged on the back side of the wearer,
On the other of the outer ends in the longitudinal direction of the diaper main body, an abdominal side flap that extends outward in the width direction from the diaper main body and is disposed on the abdomen side of the wearer;
A disposable diaper comprising a joint for joining the back side flap and the diaper main body,
The stretchable member located on the outermost side in the width direction among the plurality of stretchable members is stretched along the longitudinal direction and overlaps the joint in the thickness direction of the disposable diaper,
A non-joined portion where the back side flap and the diaper main body are not joined is provided on the outer side in the width direction than the stretchable member located on the outermost side in the width direction,
The back side flap is joined to both outer ends in the width direction of the back side flap, and the diaper main body or the abdomen side flap disposed on the stomach side of the wearer A disposable diaper characterized in that a fastening member for detachably fastening the back side flap is provided. The diaper main body includes a pair of side sheets that respectively cover both ends of the absorbent body in the width direction and are spaced apart in the width direction;
The side sheet is disposed between the top sheet and the side flap, and is joined to the top sheet and the side flap in a region overlapping the absorber in the thickness direction, respectively.
The disposable diaper according to claim 1, wherein a side elastic member that expands and contracts in the longitudinal direction is provided at an inner end in the width direction of the side sheet. The back side flap is connected to one end of the diaper body in the longitudinal direction,
The disposable diaper according to claim 1 or 2, wherein the ventral side flap is connected to the other end of the diaper body in the longitudinal direction.

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