JP6074184B2 - Pad type disposable diaper - Google Patents

Description

  The present invention relates to a pad-type disposable diaper.

  As disposable diapers, those of a pad type, a tape type, a pants type and the like are provided. Moreover, the auxiliary | assistant absorbent article which can be absorbed from both front and back is also provided as one form of pad type.

  Pad-type disposable diapers (see Patent Documents 1 and 2) are assumed to be used on the inner surface of an outer (used outside) such as a tape type or a pants type. A general disposable diaper that becomes an outer one is generally one in which three-dimensional gathers projecting to the body side extend in the front-rear direction on both sides of the surface. It is preferable that the pad-type disposable diaper fits between three-dimensional gathers.

  However, when the space between the three-dimensional gathers in the crotch part is narrow like a slim pants-type disposable diaper, if you try to spread a wide pad-type disposable diaper to secure a large amount of absorption, the pad-type disposable The crotch part of the diaper will not fit between the three-dimensional gathers of the outer disposable diaper or will be pushed in forcibly, which not only makes the mounting operation difficult and deteriorates the mounting feeling, but also causes the risk of leakage.

  This problem can be alleviated by cutting both side edges of the crotch part along the circumference of the legs in the pad-type disposable diaper and making the crotch width narrower than the front and rear sides (constricted shape), but with built-in absorber As described above, it is necessary to cut the both side edges of the article at positions spaced apart from the side edges of the absorbent body to some extent.

JP-A-9-99007 JP 2009-195309 A

  Then, the main subject of this invention is providing the pad type disposable diaper which the width | variety of a crotch part is narrow with respect to an absorber width | variety, and is easy to fit between outer solid gathers.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An absorbent body that extends from the front side of the crotch part to the back side of the crotch part through the crotch part, and has a narrowed part narrower than the front and rear sides in the crotch part;
A front side covering material and a back side covering material covering the front side and the back side respectively from the front side of the constricted part to the rear side of the constricted part in this absorber,
Three-dimensional gathers extending from the front side of the crotch part to the back side of the crotch part are provided on both sides of the diaper surface,
The three-dimensional gather includes a root portion attached to the diaper, a protruding portion protruding from the root portion, a lodging portion formed by fixing both front and rear ends of the protruding portion in a lying state, and the protruding portion. It has a non-fixed free part located between the front and rear lodging parts of the part, and an elastic elastic member fixed in a stretched state in the front-rear direction at least at the tip of the free part,
In the surface side covering material and back side covering material, a portion located in the constricted portion are returned folded on the front side along the side edges of the absorbent body from the portion being cut away located on both sides before and after,
The folded portion is composed of a portion fixed to the root portion of the three-dimensional gather, a portion corresponding to the free portion of the three-dimensional gather, and a portion not fixed to the free portion of the three-dimensional gather .
A pad-type disposable diaper characterized by that.

(Function and effect)
Thus, in the front surface side covering material and the back surface side covering material, the portion located at the constricted portion is separated from the portions located at both the front and rear sides thereof and folded back to the front side or the back side along the side edge of the absorber, and this folded portion By fixing to the opposing surface, the side edge of the absorbent body and the side edge of the crotch part of the diaper are substantially equal. Therefore, the width of the crotch portion of the absorbent body can be made as wide as possible to ensure the amount of absorption, and the width of the crotch is narrow relative to that, that is, it is easy to fit between the outer three-dimensional gathers. it can.
Further, when fixing the folded portion to the outer surface in the width direction of the three-dimensional gather, if the fixed portion is fixed to the free portion of the three-dimensional gather, the three-dimensional gather becomes hard, which may cause a decrease in followability and a deterioration in wearing feeling. . Therefore, it is desirable that the folded portion is fixed only to the base portion of the three-dimensional gather so that the free portion of the three-dimensional gather is hardly affected by the folded portion.

<Invention of Claim 2 >
The surface-side coating material includes at least root portions of the three-dimensional gather that covers both sides of the diaper surface, the back-side coating material includes a liquid-impermeable sheet that covers the back side of the absorber, and the surface-side coating material The pad-type disposable diaper according to claim 1, wherein the cover material and the back surface side covering material are joined directly or indirectly.

(Function and effect)
The present invention is preferably applied to a pad-type disposable diaper having such a structure. In this case, when the folded portion includes the liquid-impermeable sheet, the folded portion functions as a leakage preventing portion.

<Invention of Claim 3 >
The pad-type disposable diaper according to claim 1 or 2, wherein one or more notches or notches from the tip toward the folding position are provided in the middle in the front-rear direction of the folded-back portion, or a plurality of notches are provided at intervals in the front-rear direction.

(Function and effect)
By providing such a notch or notch in the folded portion, it is difficult for the fold to move toward the folded portion in the mounted state, and deterioration of the wearing feeling can be prevented.

<Invention of Claim 4 >
An absorbent body that extends from the front side of the crotch part to the back side of the crotch part through the crotch part, and has a narrowed part narrower than the front and rear sides in the crotch part;
A front side covering material and a back side covering material covering the front side and the back side respectively from the front side of the constricted part to the rear side of the constricted part in this absorber,
In the surface side covering material and the back surface side covering material, the portion located in the constricted portion is cut off from the portion located on both the front and back sides thereof and folded back to the front side or the back side along the side edge of the absorber, This folded part is fixed to the opposite surface,
Of the portions located in the constricted portion in the front surface side covering material and the back surface side covering material, the portion excluding at least one of the front end portion and the rear end portion is defined as the folded portion, and the remaining portion is defined as the non-folded portion. Is provided with a cut or notch from the tip toward the folding position,
A pad-type disposable diaper characterized by that .

(Function and effect)
Thus, in the front surface side covering material and the back surface side covering material, the portion located at the constricted portion is separated from the portions located at both the front and rear sides thereof and folded back to the front side or the back side along the side edge of the absorber, and this folded portion By fixing to the opposing surface, the side edge of the absorbent body and the side edge of the crotch part of the diaper are substantially equal. Therefore, the width of the crotch portion of the absorbent body can be made as wide as possible to ensure the amount of absorption, and the width of the crotch is narrow relative to that, that is, it is easy to fit between the outer three-dimensional gathers. it can.
And, when a non-folded portion is provided in this way and a cut or notch is provided from the tip toward the folded position, the pad-type disposable diaper at this part is wider than the interval between the outer three-dimensional gathers. The outer three-dimensional gather can be inserted and hooked there, and not only the outer three-dimensional gather can be prevented from inappropriate deformation and the pad-type disposable diaper side deformation, but also the pad-type disposable diaper It is possible to effectively prevent the positional deviation and the side portion from curling.

  As described above, according to the present invention, the width of the crotch portion is narrower than the width of the absorbent body, and advantages such as a pad-type disposable diaper that easily fits between outer three-dimensional gathers are brought about.

It is a top view which shows the inner surface side of the expansion | deployment state of a pad type disposable diaper. It is a top view which shows only the principal part. It is YY sectional drawing of FIG. It is ZZ sectional drawing of FIG. It is a perspective view which shows the inner surface side of a mounting state. It is a top view (inner surface side) of the underpants type disposable diaper of a deployment state. It is a top view (outer surface side) of the underpants type disposable diaper of a deployment state. It is a principal part top view of the underpants type disposable diaper of an unfolded state. It is CC sectional drawing of FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a top view which shows the adhesive agent application pattern of a pants type disposable diaper. It is a top view which shows the elastic member cut pattern of a pants type disposable diaper. It is a perspective view of the wearing state of a pants type disposable diaper. It is a rear view of the wearing state of a pants type disposable diaper. It is DD sectional drawing of FIG. It is a rear view of the wearing state of a pants type disposable diaper. It is a principal part enlarged plan view (outer surface side) of the underpants type disposable diaper of a deployment state. It is a principal part enlarged plan view (outer surface side) of the underpants type disposable diaper of a deployment state.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The term “groin” in the terminology of the present invention means a part that corresponds to the crotch of the body at the time of use, and depending on the product, from the center in the front-rear direction of the article as shown in the figure to the predetermined part on the front side. Range, or a predetermined range at the center in the front-rear direction of the article. In the case of having a narrow constricted portion in the middle in the front-rear direction of the article or in the middle in the front-rear direction of the absorbent body, it means a predetermined front-rear direction range having the minimum width portion of one or both constricted portions in the center in the front-rear direction. Further, “front part (abdominal part)” means a part on the front side of the crotch part, and “rear part (back side part)” means a part on the rear side of the crotch part.

<Examples of pad-type disposable diapers>
(Basic structure)
1 to 4 show a pad-type disposable diaper example 200 according to the present invention. This pad-type disposable diaper 200 has a crotch portion C2, and a front portion F2 and a rear portion B2 extending on both front and rear sides thereof. The dimensions of each part can be determined as appropriate. For example, the total length (length in the front-rear direction) L is about 350 to 700 mm, and the total width W1 is about 130 to 400 mm (however, wider than the width of the absorbent surface of the diaper). In this case, the length of the crotch portion C2 in the front-rear direction is about 10 to 150 mm, the length of the front portion F2 is about 50 to 350 mm, and the length of the rear portion B2 is about 50 to 350 mm. be able to.

  The pad-type disposable diaper 200 has a basic structure in which an absorbent body 223 is interposed between the inner surface of the liquid-impermeable sheet 221 and the liquid-permeable top sheet 222.

  A liquid-impermeable sheet 221 is provided on the back side of the absorber 223 so as to protrude slightly from the periphery of the absorber 223. As the liquid-impermeable sheet 221, a sheet having moisture permeability can be used in addition to a polyethylene film or the like without impairing water shielding from the viewpoint of preventing stuffiness. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. Can be used. The outer surface of the liquid-impermeable sheet 221 can be covered with an exterior sheet made of a nonwoven fabric.

  The surface side of the absorber 223 is covered with a liquid-permeable top sheet 222. In the illustrated form, both end portions in the width direction of the absorber 223 partially protrude from the side edge of the top sheet 222, but the side edges of both ends in the width direction of the absorber 223 do not protrude. You can also widen the width. As the top sheet 222, a perforated or non-porous nonwoven fabric or a perforated plastic sheet is used. As the material fiber constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

  It is desirable to interpose an intermediate sheet 225 between the top sheet 222 and the absorber 223. This intermediate sheet 225 is provided to prevent the urine that has been absorbed by the absorbent body 223 from returning, and uses a material having low water retention and high liquid permeability, such as various nonwoven fabrics and mesh films. Is desirable. When the front end of the top sheet 222 is 0% and the rear end of the top sheet 222 is 100%, the front end of the intermediate sheet 225 is preferably located in the range of 0 to 11%, and the rear end of the intermediate sheet 225 is It is preferably located in the range of 92 to 100%. The width W4 of the intermediate sheet 225 is preferably about 50 to 90% of the width W2 of the absorber 223 described later.

  At both ends in the front-rear direction of the pad-type disposable diaper 200, the liquid-impermeable sheet 221 and the liquid-permeable top sheet 222 are attached to the front and rear ends of the absorbent body 223 so as to extend to the front and rear sides, respectively. A non-end flap portion EF is formed. On both sides of the pad-type disposable diaper 200, the liquid-impermeable sheet 221 extends outward from the side edge of the absorbent body 223, and the inner surface of the portion from the extended part to the side part of the top sheet 222 The portion 224x on the outer side in the width direction of the gather sheet 224s constituting the three-dimensional gather 224 is pasted over the entire front-rear direction to constitute the side flap portion SF where the absorber 223 does not exist. 1 are shown by a diagonal pattern in FIG. 1 and a dotted pattern in FIG. 4, respectively, and can be formed by hot melt adhesive, heat sealing, or ultrasonic sealing.

  As a material for the gather sheet 224s, a plastic sheet or a melt-blown nonwoven fabric can be used. However, in terms of touch to the skin, a nonwoven fabric that is water-repellent treated with silicon or the like is preferably used.

  A portion 224c on the center side in the width direction of the gather sheet 224s extends to the top sheet 222, and an elongated elastic member 224G is stretched along the front-rear direction at the end portion on the center side in the width direction. It is fixed with a melt adhesive or the like. As the elongated elastic member 224G, styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, etc., which are formed in a thread shape, a string shape, a belt shape, etc. Ordinarily used materials can be used.

  In addition, both gather sheets 224s have the widthwise outer portion 224x adhered and fixed to the liquid-impermeable sheet 221 over the entire front and rear direction, and the widthwise center side portion 224c is lying down at both ends in the front and rear direction. In this state, it is bonded and fixed to the inner surface of the article (the surface of the top sheet 222 in the illustrated embodiment), and is not fixed to the inner surface of the article (the surface of the top sheet 222 in the illustrated embodiment) between both ends in the front-rear direction. This non-fixed portion is a portion that becomes a barrier portion that can stand up with respect to the inner surface of the article (the surface of the top sheet 222 in the illustrated embodiment), as shown by a two-dot chain line in FIG. The sheet 224s is located at the boundary between the outer fixed portion 224x and the inner portion 224c.

  The absorbent body 223 is basically made of a pulp fiber stack, a collection of filaments such as cellulose acetate, or a non-woven fabric, and is obtained by mixing and adhering a superabsorbent polymer such as particles as necessary. Can be used. The absorbent body 223 can be wrapped with a wrapping sheet 226 such as crepe paper (not shown in the cross-sectional view) as necessary, such as when mixing superabsorbent polymer particles.

The fiber basis weight and the basis weight of the superabsorbent polymer in the absorbent body 223 can be appropriately determined, but the fiber basis weight is preferably about 100 to 600 g / m ^2, and the basis weight of the absorbent polymer is about 0 to 400 g / m ^2. Is preferable. More specifically, the fiber basis weight of the lower layer absorbent body 223B can be, for example, about 80 to 400 g / m ² , and the basis weight of the superabsorbent polymer can be, for example, about 50 to 400 g / m ^2. Can be about 80 to 300 g / m ² , and the basis weight of the superabsorbent polymer can be about 10 to ²⁰⁰ g / m ^2, for example.

  The absorber 223 is formed as a narrowed portion 223n having a narrow middle portion in the front-rear direction including the crotch portion C2. The minimum width W5 of the constricted portion 223n is preferably about 50 to 65% of the width W2 of the non-constricted portion located before and after the constricted portion 223n. Further, when the front end of the article is 0% and the rear end of the article is 100%, the front end of the constricted portion 223n is preferably located in the range of 10 to 25%, and the rear end of the constricted portion 223n is 40 to 65%. It is preferable that the portion of the constricted portion 223n having the minimum width W5 (minimum width portion) is preferably in the range of 25 to 30%.

(Folded part)
Characteristically, as shown in FIGS. 1 and 4, a gather sheet 224s (surface side coating material) and liquid impervious covering the front side and the back side from the front side of the constricted portion 223n through the constricted portion 223n to the rear side thereof, respectively. In the adhesive sheet 221 (back surface side covering material), the portion located at the constricted portion 223n is separated from the portions located at both the front and rear sides thereof and folded back to the front side along the side edge of the absorber 223, and the folded portion 230 is shown in FIG. As shown in FIG. An adhesive 230f as the fixing means is shown in FIG. FIG. 2 shows a state in which the folded portion 230 is expanded. Although not shown, the folded portion can be formed by folding back on the opposite side to the illustrated example.

  The front surface side covering material and the back surface side covering material constituting the folded portion 230 can be replaced with another sheet different from the illustrated example, or can be configured in combination with another sheet.

  Although the length in the front-rear direction of the folded portion 230 can be determined as appropriate, it is desirable to cover the entire portion of the side edge of the constricted portion 223n that linearly extends in the front-rear direction, and the length 230L is the constricted portion. It can be about 45 to 65% of the length in the front-rear direction of 223n.

  Thus, among the parts where the gather sheet 224s and the liquid-impermeable sheet 221 are pasted together, the part located at the constricted part 223n of the absorbent body 23 is separated from the parts located at both the front and rear sides thereof, and the side edges of the absorbent body 223 are separated. The side flap portion SF is substantially eliminated in the crotch portion, and the side edge of the absorbent body 223 and the crotch of the diaper are widened even if the width of the absorbent body 223 is widened. The side edges of the parts are almost equal. Therefore, the width of the crotch portion of the absorbent body 223 can be made as wide as possible to secure the amount of absorption, and the width of the crotch can be narrowed for that, as shown in FIG. It can be easily fitted between the three-dimensional gathered BS of the diaper 1. Moreover, in the form in which the folded portion 230 includes the liquid-impermeable sheet 221 as illustrated, the folded portion 230 also functions as a leakage preventing portion. The outer disposable diaper 1 is of a pants type having the interior body 10 on the inner surface of the exterior sheet 20 and the three-dimensional gather BS on both sides of the interior body.

  In the case of the illustrated embodiment, the folded portion 230 is fixed to the outer surface in the width direction of the three-dimensional gather 224. In this case, if the three-dimensional gather 224 is fixed to the free portion, the three-dimensional gather 224 becomes hard and follows. There is a risk of causing a decrease in sex and a feeling of wearing. Therefore, it is desirable that the folded portion 230 is fixed only to the base portion of the three-dimensional gather 224 so that the free portion of the three-dimensional gather 224 is hardly affected by the folded portion 230. In the illustrated embodiment, since the folded portion 230 is wide, the portion corresponding to the free portion of the folded portion 230 is a free portion similar to the free portion of the three-dimensional gather 224, but is further folded and fixed to the facing surface. By doing so, it is possible to eliminate the free part. Of course, when the width of the folded portion 230 is narrow and the tip of the folded portion 230 fits within the fixed portion of the three-dimensional gather 224, the folded portion 230 does not have a free portion.

  Since the folded-back portion 230 is a portion located in the crotch portion, the folded portion 230 is curved in a U shape in the mounted state, and the wrinkle is more easily formed on the distal end side, which may deteriorate the mounting feeling. Therefore, as shown in the figure, it is desirable to provide a wrinkle-preventing cutout 231 that extends from the tip to the folding position in the middle in the front-rear direction of the folded portion 230 to prevent wrinkling of the folded portion 230 in the mounted state. Although only one notch for preventing wrinkles may be provided as in the illustrated example, a plurality of wrinkle-preventing notches may be provided at intervals in the front-rear direction. Further, the wrinkle prevention notch 231 in the illustrated example is formed in a U-shape, but may be a V-shape or the like, or may be a simple cut, that is, a linear cut.

  On the other hand, when the width of the pad-type disposable diaper 200 is wider than the space of the three-dimensional gather BS of the outer disposable diaper 1 because the entire width of the absorbent body 223, that is, the width of at least one side before and after the constricted portion 223n is wide, etc. Even if the crotch part of the disposable diaper 200 has a width that fits between the three-dimensional gathered BS of the outer disposable diaper 1, the front and rear sides thereof cannot be stored. Or inadequate deformation of the side part of the pad-type disposable diaper 200. Therefore, as shown in the figure, the portion excluding the rear end portion of the gathered sheet 224s (front surface side covering material) and the liquid impermeable sheet 221 (back surface side covering material) located at the constricted portion 223n is a folded portion. It is also proposed that a non-folded portion 232 is formed at the rear end portion, and a notch 233 for insertion from the front end toward the folded position is provided in the non-folded portion 232. The insertion notch 233 in the illustrated example is formed in a V shape, but may be a simple cut, that is, a linear cut.

  When the non-folding portion 232 is provided in this way and the insertion notch 233 extending from the tip to the folding position is provided there, the pad type disposable diaper 200 has a three-dimensional gather of the outer disposable diaper 1 as shown in FIG. Even if it is wider than the distance between the BSs, the three-dimensional gather BS of the outer disposable diaper 1 can be inserted into the notch 233 for insertion and can be hooked. In addition to preventing inappropriate deformation of the side portion of the type disposable diaper 200, positional displacement of the pad type disposable diaper 200 and curling of the side portion can be effectively prevented.

  Note that such a non-folded portion 232 may be provided at the front end portion of the portion positioned at the constricted portion 223n instead of the rear end portion of the portion positioned at the constricted portion 223n or together with this.

<Outer disposable diaper example>
The outer disposable diaper 1 combined with the pad-type disposable diaper 200 of the present invention is not particularly limited, and can be a larger pad-type disposable diaper or a tape-type disposable diaper. A pants-type disposable diaper is preferable in that it becomes. So, below, an example of the underpants type disposable diaper as this outer disposable diaper 1 is demonstrated.

  6-16 has shown the underpants type disposable diaper 1 of embodiment. The pants-type disposable diaper 1 (hereinafter also simply referred to as a diaper) includes an exterior sheet 20 that forms a front body F and a back body B, and an interior body 10 that is fixed and integrated with the inner surface of the exterior sheet 20. The interior body 10 is formed by interposing an absorber 13 between a liquid-permeable top sheet 11 and a liquid-impermeable back sheet 12. In manufacturing, after the back surface of the interior body 10 is fixed to the inner surface (upper surface) of the exterior sheet 20 by a joining means such as a hot melt adhesive G, the interior body 10 and the exterior sheet 20 are the front body F and the back body. Folded at the center of the vertical direction (front-rear direction) which is the boundary of B, both sides thereof are joined to each other by heat welding or hot melt adhesive, etc., and side seal portions 21 and 22 are formed. And it becomes a pants type disposable diaper in which a pair of left and right leg openings are formed.

(External sheet structure example)
As shown in FIGS. 9 to 11, the exterior sheet 20 is a two-layer structure sheet in which an inner layer 20 </ b> A and an outer layer 20 </ b> B each made of a nonwoven fabric are bonded together by a hot melt adhesive, Various elastic members 24 are sandwiched and fixed in a stretched state between the nonwoven fabrics of the folded portion 20C formed by folding the outer layer 20B to the inner surface side at the waist opening edge between the layers 20B and imparting elasticity. The planar shape forms a pseudo hourglass shape as a whole by the concave leg opening edges (edges of the leg opening portions) 29 formed to form the leg openings on the both sides of the middle. As the elastic members 24 to 28, synthetic rubber or natural rubber formed into an elongated shape such as a thread shape, a string shape, or a belt shape can be used.

  In particular, in the illustrated exterior sheet 20, as shown in FIGS. 6 to 8, waist elastic members 24, 24... Disposed in the vicinity of the waist opening 23 in the front body F and the back body B, respectively. A plurality of waistline elastic members 25, 25... Disposed at the crotch side relative to the waist elastic members 24, 24... Aside from 25, 25..., The side seal portions 21 and 22 that join the front body F and the back body B are curved so as to go to the opposite body side along the leg opening edge 29 toward the center in the width direction. On the other hand, a plurality of curved elastic members 26, 28,... Are provided which extend to portions overlapping with both side portions of the interior body 10 and are spaced apart from each other. In the exterior sheet 20, the curved elastic members 26, 28... Ensure the fit around the legs, so that the leg circumferences that are substantially continuous from the front body F to the back body B along the leg opening edges 29. Although the elastic member is not provided, it can be provided together with the curved elastic members 26, 28,.

  The waist elastic members 24, 24... Are a plurality of thread rubber-like elastic members arranged in the vertical direction near the waist opening edge in the vertical range having the side seal portions 21, 22. In order to attach the waist opening edge of the diaper to the body by giving an expansion / contraction force so as to tighten around the waist part of the body by being fixed to the exterior sheet in an extended state in the extending direction (width direction of the diaper) belongs to. For the waist elastic member 24, rubber thread is used in the illustrated example. However, for example, a tape-like elastic member may be used. Further, the waist elastic members 24, 24... Shown in the figure are sandwiched between the nonwoven fabrics of the folded portions 20C of the outer layer 20B in the waist, but may be sandwiched between the inner layer 20A and the outer layer 20B. good.

  The waist elastic members 25, 25... Are spaced vertically in the vertical range corresponding to the side seal portions 21, 22 and the range from the crotch side to the upper side to the lower side. And is an elongated elastic member such as rubber thread disposed along the width direction, and is fixed to the exterior sheet in an extended state in the extending direction (width direction of the diaper), so that the front body F and the back body Each of the waist portions of B is given a stretching force in the width direction so that the diaper is in close contact with the body. Note that the boundary between the waist elastic members 24, 24... And the waist elastic members 25, 25. For example, among the elastic members arranged in the width direction with an interval in the vertical direction on the front body F and the back body B, even if the number cannot be specified, several on the upper side function as the waist elastic members. The remaining elastic members only have to function as waist elastic members.

  In the back body B, the dorsal curved elastic members 26, 26... Arranged separately from the waist elastic members 25, 25... Have an acute angle crossing angle θ (hereinafter referred to as the vertical direction) with the vertical direction in the middle in the longitudinal direction. A predetermined curve in which the vertical crossing angle θ increases within a range of 0 ° to 90 ° from the minimum point toward the both sides in the width direction, and In a state where the diaper is unfolded, it is arranged along a predetermined curve having a crossing portion in which the vertical crossing angle θ is 60 degrees or less in a region overlapping with both side portions of the interior body 10, and its extending direction It is fixed to the exterior sheet in a stretched state. There may be one dorsal curved elastic member 26, but it is preferable that there are a plurality of dorsal curved elastic members 26. In the illustrated example, there are five elastic rubber-like elastic members, and these dorsal curved elastic members 26, 26. They are arranged at intervals without crossing. The dorsal curved elastic member groups 26, 26,... Are arranged so as to form a predetermined expansion / contraction zone, instead of arranging a few elastic expansion / contraction members at a close interval and substantially as one bundle. Plural or more are arranged at predetermined intervals.

  In the front body F, the abdomen curved elastic members 28, 28... Arranged separately from the waist elastic members 25, 25... Have a minimum longitudinal crossing angle .theta. The interior body 10 has a minimum point and a predetermined curve in which the longitudinal crossing angle θ increases within a range of 0 degrees to 90 degrees from the minimum point toward both sides in the width direction, and the diaper is unfolded. Is disposed along a predetermined curve having an intersecting portion in which the longitudinal crossing angle θ is 60 degrees or less in a region overlapping with both side portions, and is fixed to the exterior sheet in an extended state in the extending direction. ing. The ventral curved elastic members 28, 28... May be one, but preferably a plurality. The illustrated example is five thread-like elastic members, and these ventral curved elastic members 28, 28. They are arranged at intervals without crossing each other. The ventral curved elastic member groups 28, 28,... Are not substantially arranged as a bundle with a few intervals between the two or three elastic elastic members so as to form a predetermined elastic zone. Plural or more are arranged at predetermined intervals.

  The curved elastic members 26, 28,... May not be entirely curved as in the illustrated example, and may partially have a linear portion. When the curved elastic members 26, 28,... Are provided on both the front body F and the back body B, a part or all of the group of the curved elastic members 28 arranged on the front body F side and the back body B side. A form (not shown) in which a part or all of the group of curved elastic members 26 arranged on the crotch part intersects at the crotch part or in the vicinity of the front side or the rear side thereof can be adopted. The group of curved elastic members 28 arranged on the back side and the group of curved elastic members 26 arranged on the back body B side do not cross each other, and in the longitudinal direction at a position slightly deviated from the front / rear middle part, particularly the front body F The vertical separation distance is preferably about 10 to 20 mm.

  On the other hand, in the illustrated example, the waist elastic members 25, 25... And the curved elastic members 26, 28, which are arranged in the front body F and the back body B, are provided in a part of the interior body 10. In other words, the region is a non-stretchable region. Thus, the form which does not have or is not provided with the elastic member includes the form in which the elastic member is present, but also the form in which the elastic member is present but is finely cut to the extent that the contraction force does not act. FIG. 13 shows the latter example. The waist elastic members 25, 25... And the curved elastic members 26... 28 are crossed from the side seal portion 22 on one side across the interior body 10 and on the other (opposite) side. After the side seal portion 22 is continuously provided, a part or the whole of the portion crossing the interior body 10 is cut by a predetermined cutting pattern CP so as to be discontinuous. By making the elastic members 25, 26 and 28 discontinuous at the portion overlapping the interior body 10, shrinkage in the width direction of the interior body 10 (particularly the absorber 13) can be prevented. Of course, the waist elastic members 25, 25... Can be continuously arranged across the interior body 10.

  The above-described exterior sheet 20 can be manufactured by, for example, techniques described in Japanese Patent Application Laid-Open No. 4-28363 and Japanese Patent Application Laid-Open No. 11-332913. Moreover, in order to cut | disconnect the curved elastic members 26 ... 28 on the interior body 10 and to make it discontinuous, it describes in Unexamined-Japanese-Patent No. 2002-35029, Unexamined-Japanese-Patent No. 2002-178428, and Unexamined-Japanese-Patent No. 2002-273808. The cutting method to be used is preferably employed.

(Bent fit part)
As shown in detail in FIGS. 18 and 19, the exterior sheet 20 includes a side overlapping portion 41 in which portions on both sides in the width direction of the crack facing portion of the exterior sheet 20 of the back body B overlap with the side portions of the interior body 10. And a laterally extending portion 42 extending laterally from the side edge 10e of the interior body 10, and the back-side curved elastic member 26 extends from the right side seal portion of the back body B to the back body B To the right side overlapping portion 41 along the right leg opening edge 29, and further curved toward the front side while moving further toward the center side in the width direction from the right side overlapping portion 41 in the width direction of the rear body B It reaches the crack facing part located in the central part, is folded back to the rear side at the crack facing part, is further curved toward the left side toward the left side, and reaches the left side overlapping part 41, and is on the left side. The left leg opening edge 29 of the back body B from the overlapping part 41 It is fixed so as to reach the side seal portion of the left back body B along.

  Also, an elongated shape that extends from the side edge of one side extending portion 42 to the side edge of the other side extending portion 42 across the crack opposing portion and the side overlapping portions 41 on both sides thereof in the width direction. Are fixed to the exterior sheet 20 in a state of being stretched at a predetermined elongation rate in the extending direction.

  In the crack-opposing portion, the back-side curved elastic member 26 and the cracked-portion width direction elastic member 27 are finely divided by a predetermined cutting pattern CP only at the portion located on the center side in the width direction of the side overlap portion 41. The cracked portion width direction elastic member 27 is cut to be a non-shrinkable portion 43 on which no contractile force acts, and a main portion 44 located on the crack-opposing portion, a side overlapping portion 41 and a side extending portion. 42, an edge side portion 46 located on the outer side in the width direction of the boundary portion 45, and an intermediate portion 47 located between the boundary portion 45 and the non-shrinkable portion 43. Is fixed to the exterior sheet 20 at a low elongation rate.

  In the pants-type disposable diaper configured as described above, only the portion located on the center side in the width direction of the side overlapping portion 41 of the back side curved elastic member 26 and the cracked portion width direction elastic member 27 is finely cut. Since the portions which are not substantially contracted are formed, the facing portion between the cracks enters into the wearer's crack due to the contracting action of the cracked portion width direction elastic member 27 as shown in FIGS. 15 and 16. The shape (the inner surface of the diaper is raised in a ridge shape) is a bent fitting portion 40, and the inner body 10 fits to the bottom without unnecessarily shrinking in the central portion in the width direction of the side overlap portion 41. Become. On the side thereof, the contraction force of the cracked portion width direction elastic member 27 acts firmly on the boundary between the side overlapping portion 41 and the side extending portion 42 and in the vicinity of both sides in the width direction so that the inner body 10 side The edge fits well to the wearer's buttocks, and the shrinkage force acts weakly or substantially does not act on the outer part in the width direction (the state where the shrinkage force does not act at all, (Including a state where it is acting but not contracted), it is difficult for the edge of the leg opening to bend. Therefore, it is excellent in the rupture and fit on both sides in the width direction, and the edge of the leg opening in the back body B is difficult to bend. Moreover, since the cracked portion width direction elastic member 27 is provided along the width direction, it can be manufactured not only at a low cost but also stably by a high-speed line.

  Although the elongation rate of each part of the crack part width direction elastic member 27 can be determined as appropriate, the main part 44 and the boundary part 45 are preferably 200 to 240%, and the edge part 46 and the intermediate part 47 are 100 to 140. % Is preferable.

  A method for attaching the cracked portion width direction elastic member 27 having such a difference in elongation rate is not particularly limited, but when manufactured using existing technology, it is preferably applied as shown in FIGS. 12 and 18. That is, when the cracked portion width direction elastic member 27 is supplied at a higher elongation rate and fixed to the exterior sheet 20, the amount of hot melt adhesive G2, G3 applied between the outer layer 20B and the inner layer 20A is set. The edge portion 46 and the intermediate portion 47 are less than the main portion 44 and the boundary portion 45, and thereafter, the side overlapping portion 41 of the dorsal curved elastic member 26 and the cracked portion width direction elastic member 27 is reduced. A method is proposed in which only the portion located on the center side in the width direction is finely cut and the end of the crack width direction elastic member 27 is cut by punching the leg opening. Thereby, while the main part 44 and the boundary part 45 of the crack part width direction elastic member 27 are fixed with respect to the exterior sheet 20 by the elongation rate at the time of supply by hot-melt adhesive G2, G3 of sufficient application quantity, As a result of the edge-side portion 46 and the intermediate portion 47 of the crack width-direction elastic member 27 being weakly fixed by the hot-melt adhesive G3 with a small coating amount, the edge-side portion 46 and the intermediate portion 47 are contracted to some extent and drawn toward the boundary portion 45. It becomes fixed at a lower elongation rate. The crack part width direction elastic member 27 can be attached at the same time by the same method as the waist elastic member 25 except that the hot melt adhesive G2 is intermittently applied.

  The method for providing the difference in the application amount of the hot melt adhesive is not particularly limited. As will be described later, when fixing the cracked portion width direction elastic member 27 to the exterior sheet 20, the cracked portion width direction elastic member 27 is attached to the outer periphery thereof. When the method of directly applying the hot melt adhesive G2 to the surface and then fixing to the exterior sheet 20 is adopted, the hot melt adhesive G2 is intermittently applied in the longitudinal direction of the cracked portion width direction elastic member 27. (In other words, the hot melt adhesive G2 is applied to the portions to be the main portion 44 and the boundary portion 45, and the hot melt adhesive is not applied to the portions to be the edge side portion 46 and the intermediate portion 47). A difference in the amount of melt adhesive applied, and thus the above-described difference in elongation can be achieved.

  Although the width of each part can be determined as appropriate, in the normal case, the width of the crack facing part is about 0.15 to 0.40 times the width 10X of the interior body 10, and the side overlapping portion 41 is the width of the interior body 10. 10X is about 0.05 to 0.20 (only on one side), the laterally extending portion 42 is about 0.05 to 0.35 (only on one side) times the width 10X of the interior body 10, and the non-shrinkable portion 43 is on the interior. The width 10X of the body 10 is about 0.25 to 0.40 times (one side only), the main portion 44 is about 0.10 to 0.40 times the width 10X of the interior body 10, and the boundary portion 45 is the width of the interior body 10. 10X is about 0.05 to 0.20 times (only one side), the edge portion 46 is about 0.05 to 0.10 times (one side only) the width 10X of the interior body 10, and the intermediate portion 47 is about the interior body 10. The width can be about 0.05 to 0.15 times the width 10X (one side only).

  The contraction force acting portion (the central region in the width direction left without cutting the dorsal curved elastic member 26 and the cracked portion width direction elastic member 27) of the crack facing portion is a rectangular shape extending in the front-rear direction or toward the front side. The width may increase in shape (for example, an isosceles triangle shape whose base is located on the front side, or a trumpet shape whose isosceles side is a curve), but from the front end to the middle in the longitudinal direction If it has a shape in which the width increases toward the side, and further on the rear side, the width decreases toward the rear side, a bent fitting portion 40 that fits particularly well against a crack is formed. Therefore, it is preferable.

  Although the size of the contraction force acting portion of the crack facing portion can be determined as appropriate, the width is narrower than the interior body 10, for example, preferably about 0.15 to 0.40 times the width 10X of the interior body 10. The length in the front-rear direction is preferably about 1/5 to 1/2 of the length in the front-rear direction of the interior body 10. Moreover, it is preferable that the front end is located in the front-back direction center or its vicinity. The non-cut portion NC in the above-described cutting pattern has the same shape as the contraction force acting portion and has the same or slightly larger dimensions. In addition, the length and width of the groove 13D or slit provided in the absorber 13 in the front-rear direction may be shorter, longer, or the same as the contraction force acting part, but the width is less than the contraction force acting part. It is preferable to do this.

(Fixing of the interior body 10 and the exterior sheet 20)
As shown in FIG. 8 and FIG. 10, the inner body 10 can be applied to the appropriate regions 81 to 83 on the back surface of the inner body 10 and fixed to the inner surface of the exterior sheet 20. Thus, from the viewpoint of improving the followability of the interior body 10 to the movement of the legs, the width of the fixing region 81 in the crotch portion is preferably narrowed, for example, about 30 to 45% of the width 10X of the interior body 10, It is preferable that the fixing regions 82 and 83 on both the front and rear sides of the crotch portion are widened to fix the interior body 10 firmly, and in particular, extend to the vicinity of both side edges.

  The fixed regions 81 to 83 having such a shape are coated with a plurality of rows of hot melt adhesives G in the width direction, continuously in the front-rear direction at the intermediate portion, and intermittently at both sides (applied at the crotch portion). Without), each can be formed by coating.

  However, when the width of the fixed region 81 in the crotch portion is narrowed, if the narrow region is excessively extended rearward, there are the following problems. That is, in order to pull up the crotch portion backward by the dorsal curved elastic member 26, a plurality of dorsal curved elastic members 26 and cracked portion width direction elastic members 27 are provided at intervals, and at least one dorsal curved portion is provided. It is preferable that the elastic member 26 is disposed so as to bulge to the front side of the cracked portion width direction elastic member 27 located on the most front side. However, in that case, a region 84 on the outer side in the width direction of the back-side curved elastic member 26 located on the foremost side of the exterior sheet 20 and on the front side of the cracked portion width-direction elastic member 27 located on the most front side is formed in the interior body 10. If it is not fixed, the edge of the leg opening in the region 84 is likely to bend outward. Therefore, in the present embodiment, the region 81 having a narrow adhesive width in the crotch portion is not excessively extended to the rear side, and the fixed region 83 having a wide rear portion is provided on the back side of the exterior sheet 20 so as to be curved. It extends to the region 84 on the outer side in the width direction of the member 26 and on the front side of the cracked portion width direction elastic member 27 located at the foremost side so as to fix the region 84 to the interior body 10 and prevent the dripping. It is configured.

(Balance of tensile stress during longitudinal elastic deformation)
Further, in order to improve the fit of the crack facing portion, the longitudinal contraction force in which the tensile stress in the longitudinal direction in the front body F is larger than the tensile stress in the longitudinal direction in the longitudinal direction in the back body B. A balance is preferred. In the illustrated example, curved elastic members 26, 28,... Are provided as pulling elastic members that exert a contraction force of a longitudinal component so as to lift the crotch portion toward the waist in the front body F and the back body B. Due to the contraction force balance, the tensile stress at the time of elastic deformation in the front body F is larger than the tensile stress at the time of elastic deformation in the back body B. The tensile stress at the time of elastic deformation is the tensile test of the waist opening edge part of the body part to be measured and the crotch side end part of the opposite body part not to be measured, after peeling off both side seal parts 21 and 22 of the diaper and making them unfolded. It can be measured by holding each with a machine chuck and performing a tensile test. The difference in tensile stress at the time of elastic deformation can be determined appropriately, but the tensile stress at the time of elastic deformation in the longitudinal direction when the front body F is 80% elongated (when the elastic limit elongation (strain) is 100%) is It is preferably about 1.1 to 1.2 times that of the body B. As can be seen from this, the magnitude of the tensile stress at the time of elastic deformation is the same at the same elongation (when the elastic limit elongation is 100%, the elongation is preferably in the range of 65 to 95%). Means.

  When the pulling elastic members 26, 28,... Are provided on the front body F and the back body B as described above, and the tensile stress at the time of elastic deformation in the longitudinal direction in the front body F is larger than that of the back body B, As shown in FIG. 16, in the mounted state, the crotch part of the diaper moves forward due to the contraction force of the pulling elastic member 28 of the front body F against the contraction force of the pulling elastic member 26 of the back body B. While lifting, the crotch fits and the front end of the bent fitting portion 40 is pulled forward, and as a result, the bent fitting portion 40 fits the fissure while maintaining its bent state. Therefore, while fitting well from a rupture to a crotch, the fit follows the movement of a body and is maintained elastically, and a crotch part becomes difficult to mokomoko at the time of mounting | wearing. On the other hand, in a general pants-type disposable diaper, as shown in FIG. 17, as a result of the ruptured opposing part bulging and being largely separated from the skin, the crotch part is mokomoko, which is significantly different from ordinary underwear. Occurs.

  In the illustrated example, the pulling elastic member is composed of only the curved elastic members 26. The curved elastic members 26..., 28... Have a function of improving the fit to the buttocks in the front body F and improving the fit to the swelling of the buttocks in the back body B. Of course, instead of or together with the curved elastic members 26, 28, etc., an elastic member such as an elongated shape or a sheet shape may be fixed in a stretched state along the longitudinal direction at the intermediate portion in the width direction to form a lifting elastic member ( (Not shown). When the curved elastic members 26, 28,... Are used in combination with other types of lifting elastic members, the curved elastic members 26, 28,... Are used as either the front body F or the back body B, unlike the illustrated example. Only the other elastic member may be provided on the other side.

  In particular, when the curved elastic members 26, 28, etc. as shown in the illustrated example are provided, the longitudinal interval of the curved elastic members 26 in the rear body B is the front body F at the outer side in the width direction from the side edge of the interior body 10. If the arrangement is wider than the vertical spacing of the curved elastic members 28 in the case, the fitting elastic property of entering the buttocks by the curved elastic members 28 of the front body F is exhibited, and the buttocks by the curved elastic members 26 of the back body B In addition to exhibiting a fitting property that envelops the bulge, when the bent fitting portion 40 fits into a crack while maintaining its bent state, it is difficult to cause a situation of biting into the crack. Therefore, it is preferable.

  The aforementioned front-rear contraction force balance is obtained by measuring at least one of factors of tensile stress during longitudinal elastic deformation in each body F, B, for example, the thickness, elongation rate, number, etc., of the lifted elastic members 26. This can be achieved by making them different. When adjusting the thickness or the like of the pulling elastic members 26, 28, etc., the number of the pulling elastic members 26, 28, etc. is preferably determined according to the size and arrangement of the diapers. The front body F is preferably thicker or higher than the back body B so that at least one of the thickness and the elongation rate is obtained so that the aforementioned front-rear contraction force balance can be obtained.

Specifically, in the illustrated example, it is preferable to define the specifications of each part within the following range. Although the unit of thickness of the elastic member is unified to dtex, it is not limited to synthetic rubber, and natural rubber can be used. The unit dtex when natural rubber is used is the synthesis of the dtex. This means the thickness of natural rubber having an SS curve equivalent to that of rubber (eg, 0.5 mm to 3.0 mm when natural rubber is used for the waist elastic member 24).
・ Exterior sheet 20
Material: Non-woven fabric Basis weight: 30-75 g / m ² , especially 36-60 g / m ²
-Waist elastic member 24 of front body F and back body B
Thickness: 470 to 1,240 dtex, especially 940 to 1,240 dtex

Number: 5-10, especially 8-10 (each body)
Spacing: 0-5mm, especially 3-5mm
Elongation rate when fixed: 200 to 350%, especially 250 to 300%
-Elastic member 25 around the waist of the front body F
Thickness: 470-1,240 dtex, especially 470-620 dtex
Number: 6-26, especially 8-16 Interval: 10-40 mm, especially 15-35 mm
Elongation rate when fixed: 200 to 350%, especially 250 to 300%
-Elastic member 25 of the waist part of the back body B
Thickness: 470-1,240 dtex, especially 470-620 dtex
Number: 6-24, especially 9-14 Interval: 10-40 mm, especially 15-35 mm
Elongation rate when fixed: 200 to 350%, especially 250 to 300%
-Rupture width direction elastic member 27
Thickness: 470 to 1,240 dtex, especially 940 to 1,240 dtex
Number: 5 to 20, especially 9 to 10 Spacing: 5 to 20 mm, especially 10 to 16 mm
Elongation rate when fixed: 200 to 350%, especially 250 to 330%
-Curved elastic member 28 of front body F
Thickness: 620-1,240 dtex, especially 620-940 dtex
Number: 3-10, especially 5-10 Interval: 10-35 mm, especially 16-32 mm
Elongation rate at the time of fixation: 230 to 380%, particularly 300 to 380%, and higher elongation rate than the curved elastic member 26 of the back body B. The curved elastic member 26 of the back body B
Thickness: 620-1,240 dtex, especially 620-940 dtex
Number: 3-10, especially 5-10 Interval: 10-35 mm, especially 16-32 mm
Elongation rate when fixed: 200 to 350%, especially 250 to 300%

(Configuration for exterior sheet flexibility)
The longitudinal range having the waist elastic members 25... And the longitudinal range 31 having the curved elastic members 26..., 28. A plurality of elastic members 25 (for example, about 5 to 10) are included, and an interval d1 between at least some of the waist elastic members 25 is larger than an interval d2 between the other waist elastic members 25. It is preferable that it is wide. Further, even outside the overlapping range 30, the waist elastic member 25... Is in an intermediate range 32 between the longitudinal range 31 having the curved elastic members 26, 28... And the longitudinal range having the waist elastic member 24. It is preferable to provide a plurality (for example, about 10 to 16).

  In this way, while allowing a certain overlap range 30 between the longitudinal range having the waist elastic members 25 ... and the longitudinal range having the curved elastic members 26, 28 ..., the waist elastic members 25 ... are within that range. By providing a portion with a large mutual interval, the denseness of the elastic members can be suppressed without impairing the fit. As a result, the pleats are not concentrated on the exterior sheet 20 in the overlapping range 30, an unnecessary increase in thickness, the elastic member itself and hardening due to its adhesion are suppressed, and a flexible and comfortable wearing feeling can be obtained. Become.

  In a normal case, the mutual spacing d1 of the waist elastic members 25 is preferably about 15 to 50 mm, and the mutual distance d2 of the other waist elastic members 25 is preferably about 10 to 20 mm. The longitudinal length of the overlapping range 30 is preferably about 15 to 30% of the total length of the diaper in the unfolded state, and the waist portion elastic members 25 occupying the overlapping range 30 have a wide interval portion 35. The ratio is preferably about 60 to 100% in the ratio of the length in the vertical direction (that is, the sum of the distances d1 / the vertical length of the overlapping range 30). If the overlapping range 30 is too narrow, the significance of widening the interval between the waist elastic members 25 becomes thin. If it is too wide, the wide portion 35 of the waist elastic members 25 increases, resulting in a decrease in fit. In addition, if the ratio of the wide portion 35 of the waist elastic members 25... Occupying the overlapping range 30 is too small, improvement in flexibility can be expected, but remarkable improvement becomes difficult.

  Specifically, in the case of the illustrated example, the ratio of the wide portion 35 having the mutual interval d1 of the waist elastic members 25 to the overlapping range 30 is about 40% in the front body F and 100% in the back body B. . As described above, the configuration relating to the improvement in flexibility can be made different between the front body F and the back body B, and can be applied only to either the front body F or the back body B in the exterior sheet 20. (same as below).

  On the other hand, the waist elastic member 24, the waist elastic member 25, the crack width elastic member 27, and the curved elastic members 26, 28 are between the pair of sheet layers 20A, 20B constituting the exterior sheet 20. In addition, the adhesive is fixed to the sheet layers 20A and 20B by a hot melt adhesive, and the amount of the adhesive applied greatly affects the flexibility of the exterior sheet 20. Therefore, as shown in FIG. 12, the application portions G1 to G3 of the adhesive include the arrangement portion of the waist elastic member 24 and the vicinity thereof, the arrangement portion of the waist elastic member 25. The arrangement part of the elastic members 27 and the vicinity thereof, the arrangement part of the curved elastic members 26, 28, and the vertical and horizontal distances thereof within a predetermined distance a (normally within ± 25 mm, more preferably within ± 10 mm, particularly preferably ± 5 mm). It is preferable that the adhesive is not applied between the two sheet layers other than these adhesives. In this way, by reducing the adhesive application portions G1 to G3 as much as possible, hardening by the adhesive can be suppressed in each stage. In addition, when this is combined with an increase in the local spacing between the waist elastic members 25...

  FIG. 12 shows application sites G1 to G3 of the hot melt adhesive in the manufacturing process, and the curved elastic members 26, 28,... Are in a state before cutting a portion crossing the interior body 10 as indicated by a two-dot chain line. Is shown. An adhesive G1 for fixing the waist elastic member 24 and the waist elastic member 25 ... to both sheet layers 20A, 20B, and an adhesive for fixing the cracked portion width direction elastic member 27 ... to both sheet layers 20A, 20B. G2 is applied substantially only at the location where the elastic members 24 and 25 are disposed and in the vicinity thereof. Such application of the adhesive can be realized by sandwiching the elastic members 24 and 25 having the adhesive applied to the outer peripheral surface between the two sheet layers 20A and 20B, and the outer peripheral surfaces of such elastic members 24 and 25. The adhesive can be applied to a Nordson Surerup nozzle.

  On the other hand, the adhesive G3 for fixing the curved elastic members 26, 28,... To the two sheet layers 20A, 20B has a rectangular adhesive-applied portion B2 that is stepped along the curved direction of the curved elastic members 26, 28,. Are arranged in parallel to each other, so that the adhesive is applied only to the region where the curved elastic members 26, 28,..., 28. Has been. In the application process, in the normal form in which the lateral direction (diaper width direction) of the sheet layers 20A and 20B is along the line MD direction (flow direction) in the application process, the adhesive layer crosses the line CD direction (MD direction). In the direction), a plurality of slot coating nozzles are arranged in parallel, and the adhesive can be applied independently and intermittently from each nozzle.

(Structural example of interior body)
As shown in FIGS. 9 to 11, the interior body 10 has an absorbent body 13 interposed between a liquid-permeable top sheet 11 made of nonwoven fabric or the like and a liquid-impermeable back side sheet 12 made of polyethylene or the like. The excretory fluid that has permeated through the top sheet 11 is absorbed and retained.

  As the liquid-permeable surface sheet 11 covering the surface side (skin contact surface side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of through holes are formed in the liquid permeable surface sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid permeable top sheet 11 is wound around the side edge of the absorber 13 and extends to the back side of the absorber 13.

  As the liquid-impermeable back sheet 12 that covers the back surface side (non-skin contact surface side) of the absorbent body 13, a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used. Those having wettability are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. is there.

  Absorbent body 13 is a known one, for example, a pulp fiber stack, a filament aggregate such as cellulose acetate, or a non-woven fabric, mixed with a superabsorbent polymer as necessary, fixed, etc. In the example shown in the figure, a shape formed with a substantially rectangular planar shape is used, and the width dimension is a dimension width that does not give the wearer a feeling of goreness by hitting the crotch part. The absorbent body 13 can be packaged with a wrapping sheet 14 having liquid permeability and liquid retention, such as crepe paper, if necessary, for holding the shape and polymer. The shape of the absorber 13 may be a rectangular shape as shown in the figure, or may be an hourglass shape (constricted shape) in which the width of the crotch portion is narrower than the back side and the abdominal side.

  In addition, the above-mentioned bending fitting part 40 can also assist the formation by providing a groove 13D or a slit along the longitudinal direction in the crack-opposing part of the absorbent body 13, and in that case, bending at an appropriate position as a fold. The fitting part 40 is formed and the shape thereof is easily maintained.

  It is preferable that solid gather BSs that fit around the legs are formed on both sides of the interior body 10. This three-dimensional gathered BS is formed by the gathered nonwoven fabric 15. As the gathered nonwoven fabric, as shown in FIG. 10 and FIG. 11, a nonwoven fabric made into a double sheet by folding is preferably used. The side edge portion of the wound absorbent body 13 is further wound from the upper side thereof and extends to the back surface side of the absorbent body 13 to be bonded. More specifically, the gathered nonwoven fabric 15 has a three-dimensional gather BS forming portion left in the middle portion in the longitudinal direction of the diaper 1, and a range from the middle portion in the width direction to the back side of the absorbent body 13 is bonded by a hot melt adhesive or the like. Further, at the longitudinal front and rear end portions, the section from the width direction intermediate portion to the one side end edge is bonded in a range extending to the back surface side of the absorber 13, and a portion forming the three-dimensional gather BS is attached to the absorber 13 It is bonded with a hot melt adhesive or the like while being folded at the upper surface.

  Inside the gathered nonwoven fabric 15 formed of a double sheet nonwoven fabric, a plurality of thread-like elastic elastic members 16, 16... The thread-like elastic elastic members 16, 16... Are for forming a three-dimensional gather BS by standing up a nonwoven fabric portion protruding from the absorber side edge by elastic elastic force as shown by a two-dot chain line in FIG. It is.

  The liquid-impermeable back side sheet 12 enters the inside of the double sheet-like gathered nonwoven fabric 15 and constitutes a leak-proof wall on the lower end side of the three-dimensional gathered BS as shown in FIG. . As the liquid-impermeable back side sheet 12, it is desirable to use an opaque sheet so that brown such as defecation and urine does not appear. As the opacification, a plastic film and a pigment and filler such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc and barium sulfate are preferably used.

  As the thread-like elastic elastic member 16, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, and the like that are usually used can be used. Moreover, in order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less, the elongation is 150 to 350%, and the interval is 7.0 mm or less. Instead of the thread-like elastic elastic member, a tape-like elastic elastic member having a certain width may be used.

  In the same manner as the liquid-permeable surface sheet 11, the material fibers constituting the gathered nonwoven fabric 15 are olefin-based, polyester-based, amide-based synthetic fibers such as polyethylene or polypropylene, regenerated fibers such as rayon and cupra, and cotton. Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a nonwoven fabric that suppresses the basis weight and has excellent air permeability. Furthermore, for the gathered nonwoven fabric 15, in order to prevent the transmission of urine and the like, to prevent fogging, and to enhance the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic croid-based water repellent, etc. It is desirable to use a water-repellent non-woven fabric coated with.

(Front / rear presser sheet)
As shown in FIGS. 6 and 9, in order to cover the front and rear ends of the interior body 10 attached on the inner surface of the exterior sheet 20 and to prevent leakage from the front and rear edges of the interior body 10, 50, 60 are provided. The illustrated embodiment will be described in more detail. The front presser sheet 50 extends over the entire width direction from the inner surface of the folded portion 20C of the waist side end portion of the front body F to the position overlapping the front end portion of the interior body 10. The rear presser sheet 60 extends across the entire width direction from the inner surface of the folded portion 20C at the end on the waist side to the position overlapping the rear end of the interior body 10 in the inner surface of the back body B. If a slight non-adhesive portion is provided in the crotch side edges of the front and rear presser sheets 50, 60 over the entire width direction (or only the central portion), not only the adhesive does not stick out, but also this portion is removed from the surface sheet. It can be lifted slightly to function as a leak-proof wall.

  When the front and rear presser sheets 50 and 60 are attached as shown in the figure, there is an advantage that the degree of freedom of material selection is increased, but there are also disadvantages such as an increase in materials and manufacturing processes. Therefore, the folded portion 20C formed by folding the exterior sheet 20 on the inner surface of the diaper 1 can be extended to a portion overlapping the absorbent pad 200 to form a portion equivalent to the presser sheets 50 and 60 described above.

  The present invention can be used for a pad-type disposable diaper.

  B ... Back body, F ... Front body, 1 ... Outer disposable diaper, 10 ... Interior body, 11 ... Liquid permeable top sheet, 12 ... Liquid impervious back side sheet, 13 ... Absorber, 14 ... Packaging sheet, 15 Gathered non-woven fabric, 16 ... thread elastic elastic member, 20 ... exterior sheet, 20C ... exterior sheet folded portion, 21, 22 ... side seal portion, 24 ... waist elastic member, 25 ... waist elastic member, 26 ... dorsal curve Elastic member, 27 ... cracked part width direction elastic member, 28 ... ventral curved elastic member, 29 ... leg opening edge, 41 ... side overlapping part, 42 ... side extension part, 43 ... non-shrinking part, 44 ... Main part, 45 ... Boundary part, 46 ... Edge side part, 47 ... Edge side part, 81-83 ... Fixed area, 200 ... Pad type disposable diaper, 221 ... Liquid impervious sheet, 222 ... Top sheet, 223 ... Absorber, 23n: Constricted portion, 224 ... Solid gather, 224s ... Gather sheet, 225 ... Intermediate sheet, 226 ... Packaging sheet, 230 ... Folded portion, 231 ... Notch for preventing wrinkles, 232 ... Non-folded portion, 233 ... Notch for insertion .

Claims (4)

An absorbent body that extends from the front side of the crotch part to the back side of the crotch part through the crotch part, and has a narrowed part narrower than the front and rear sides in the crotch part;
A front side covering material and a back side covering material covering the front side and the back side respectively from the front side of the constricted part to the rear side of the constricted part in this absorber,
Three-dimensional gathers extending from the front side of the crotch part to the back side of the crotch part are provided on both sides of the diaper surface,
The three-dimensional gather includes a root portion attached to the diaper, a protruding portion protruding from the root portion, a lodging portion formed by fixing both front and rear ends of the protruding portion in a lying state, and the protruding portion. It has a non-fixed free part located between the front and rear lodging parts of the part, and an elastic elastic member fixed in a stretched state in the front-rear direction at least at the tip of the free part,
In the surface side covering material and back side covering material, a portion located in the constricted portion are returned folded on the front side along the side edges of the absorbent body from the portion being cut away located on both sides before and after,
The folded portion is composed of a portion fixed to the root portion of the three-dimensional gather, a portion corresponding to the free portion of the three-dimensional gather, and a portion not fixed to the free portion of the three-dimensional gather .
A pad-type disposable diaper characterized by that.   The surface-side coating material includes at least root portions of the three-dimensional gather that covers both sides of the diaper surface, the back-side coating material includes a liquid-impermeable sheet that covers the back side of the absorber, and the surface-side coating material The pad-type disposable diaper according to claim 1, wherein the cover material and the back surface side covering material are joined directly or indirectly. The pad-type disposable diaper according to claim 1 or 2, wherein one or more notches or notches from the tip toward the folding position are provided in the middle in the front-rear direction of the folded-back portion, or a plurality of notches are provided at intervals in the front-rear direction. An absorbent body that extends from the front side of the crotch part to the back side of the crotch part through the crotch part, and has a narrowed part narrower than the front and rear sides in the crotch part;
A front side covering material and a back side covering material covering the front side and the back side respectively from the front side of the constricted part to the rear side of the constricted part in this absorber,
In the surface side covering material and the back surface side covering material, the portion located in the constricted portion is cut off from the portion located on both the front and back sides thereof and folded back to the front side or the back side along the side edge of the absorber, This folded part is fixed to the opposite surface,
Of the portions located in the constricted portion in the front surface side covering material and the back surface side covering material, the portion excluding at least one of the front end portion and the rear end portion is defined as the folded portion, and the remaining portion is defined as the non-folded portion. Is provided with a cut or notch from the tip toward the folding position,
A pad-type disposable diaper characterized by that .

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