JP6860308B2 - Pants type disposable diapers - Google Patents

Description

The present invention relates to pants-type disposable diapers.

In disposable diapers, a gap is formed between the dorsal part of the diaper and the surface of the body, and excrement such as urine, watery stool, and loose stool may leak through the gap (dorsal leakage). This problem of back leakage can also occur in pants-type disposable diapers, which are said to have a relatively high fit. For this reason, conventionally, a technique for preventing back leakage of pants-type disposable diapers has been proposed.

For example, Patent Document 1 proposes to provide a dorsal barrier body along the width direction on the dorsal inner surface. However, such a barrier body cannot adjust the thickness and cushioning property, and cannot be used by a user who does not need the barrier body.

On the other hand, as described in [0091] of Patent Document 2, when a sponge body is provided on the inner surface of the dorsal side, the bag body elastically closes the gap between the diaper and the wearer's back. Therefore, leakage from the back side is effectively prevented. In this case, if the sponge body is taken out, the user can choose to use the cushion material.

However, since the one described in Cited Document 2 is used for wiping the body by inserting a hand, it can close the gap but cannot absorb it.

Japanese Unexamined Patent Publication No. 2009-034270 Japanese Unexamined Patent Publication No. 2010-23685

Therefore, a main object of the present invention is to provide a pants-type disposable diaper that can fill a gap in the back of a diaper according to the user's choice and can also assist absorption in the filled portion.

A typical aspect of the present invention that solves the above problems is as follows.
<First aspect>
An integrated exterior body from the front body to the back body, or an exterior body separately provided on the front body and the back body,
It is provided with an interior body including an absorber, which extends in the front-rear direction from the front body to the back body and is joined to the exterior body.
A side seal portion in which both side portions of the exterior body on the front body and both side portions of the exterior body on the rear body are joined, respectively.
In a pants-type disposable diaper with a waist opening and a pair of left and right leg openings.
An elastic member that elastically expands and contracts in the width direction is provided on the exterior body of the rear body in the waist circumference region that corresponds to the side seal portion in the front-rear direction.
Inside the elastic member of the exterior body of the back body, a pocket for inserting an absorbent material having an insertion port on the waist opening side is provided, and on the wall portion on the skin side of this pocket, inside and outside the pocket. Many holes are formed at intervals,
Pants-type disposable diapers that feature this.

(Action effect)
Since a pocket for inserting an absorbent material having an insertion port on the waist opening side is provided inside the elastic member of the exterior body of the back body in the waist circumference area, the user can roll or fold it in this pocket. By inserting an appropriate disposable absorbent material such as tissue paper as needed, it is possible to fill the gap between the diaper and the wearer's back, which causes back leakage. Moreover, since not only the gap is filled but also a large number of holes are formed in the portion, the absorbent material in the pocket can auxiliary absorb and hold the liquid through the holes, so that the back leakage is prevented. It can be prevented more effectively.

<Second aspect>
The exterior body of the back body has an inner sheet layer made of a water-repellent or hydrophobic non-woven fabric and an outer sheet layer made of a water-repellent or hydrophobic non-woven fabric, and the inner sheet layer and the outer sheet layers are interleaved with each other. Elastic members are sandwiched,
The non-woven fabric forming at least one of the inner sheet layer and the outer sheet layer is folded inward from the inner sheet layer and the outer sheet layer at the edge of the waist opening, and the folded portion is from the waist opening to the crotch side. It has a back side part that extends to the crotch side and a front side part that is folded back on the crotch side and extends to the waist opening side.
At least a pair of joints for joining the front side portion and the back side portion are provided at intervals in the width direction, and the non-joint portion between these joint portions is the pocket.
The pants-type disposable diaper of the first aspect.

(Action effect)
The form described in Patent Document 2 for filling the gap in the back requires a process of separately manufacturing and attaching the bag body, which complicates the manufacturing and increases the cost. On the other hand, if the pocket is formed by using the sheet material forming the exterior body as described above, the manufacturing can be performed without increasing the manufacturing process as described later. Moreover, although a water-repellent or hydrophobic non-woven fabric is widely used as the material of the exterior body, in the present invention, since a large number of holes are formed in the pocket, the absorption function by the pocket is not hindered.

<Third aspect>
The non-woven fabric forming both the inner sheet layer and the outer sheet layer is folded inward from the inner sheet layer and the outer sheet layer at the edge of the waist opening, and the folded portion is moved from the waist opening to the crotch side. It has a back side part that extends and a front side part that is folded back on the crotch side and extends to the waist opening side.
An elastic member that elastically expands and contracts in the width direction is provided between the non-woven fabrics of the portion of the front side portion located on the front side of the pocket.
The pants-type disposable diaper of the second aspect.

(Action effect)
As a result, the front side portion, which is the skin side wall portion of the pocket, is elastically pressed against the back side portion, so that the absorbent material inserted in the pocket is firmly held in the pocket.

<Fourth aspect>
As the pocket, a plurality of vertically elongated pockets are provided at intervals in the width direction, and in the portion located between the adjacent pockets, the back side portion is not joined to the member located on the outside thereof.
Pants-type disposable diapers according to the second or third aspect.

(Action effect)
In this form, by inserting the absorbent material for filling the gap in both of the adjacent pockets, the back side portion between the adjacent pockets is lifted from the outer member thereof, and a gap opening to the crotch side is formed. Therefore, while preventing the leakage of excrement by filling the gap with the absorbent material inserted in the pocket at the pocket part, the excrement leaks by introducing the excrement into the gap opening on the crotch side between the adjacent pockets. Can be prevented.

<Fifth aspect>
The portion of the back side portion located on the back side of the pocket is not joined to the member located on the outside thereof, and a large number of holes penetrating inside and outside the pocket are also formed on the back side portion at intervals. ing,
A pants-type disposable diaper according to any one of the second to fourth aspects.

(Action effect)
In this form, absorption into the pocket is possible not only from the skin side (front side) of the pocket but also from the back side.

<Sixth aspect>
As the pocket, a plurality of vertically elongated pockets are provided in the width direction within the width direction range having the interior body.
A pants-type disposable diaper according to any one of the first to fifth aspects.

(Action effect)
It is preferable to provide a plurality of such vertically elongated pockets in the width direction because the user can freely select the pocket into which the absorbent material is inserted. Further, it is preferable that the gap filling action by each pocket functions independently, so that the fit to the unevenness of the back of the wearer is improved.

As described above, according to the present invention, there are advantages such as being a pants-type disposable diaper that can fill a gap in the back of a diaper according to the user's choice and can also assist absorption in the filled portion. Brought to you.

It is a developed state plan view which shows the inner surface of a pants type disposable diaper. It is a developed state plan view which shows the outer surface of a pants type disposable diaper. It is a cross-sectional view of 3-3 of FIG. It is a cross-sectional view of 4-4 of FIG. (A) is a 5-5 cross-sectional view of FIG. 1 and (b) is a 6-6 cross-sectional view of FIG. It is a perspective view of a pants type disposable diaper. It is a developed state plan view which shows the outer surface of a pants type disposable diaper. (A) is a 5-5 cross-sectional view of FIG. 7, and (b) is a 6-6 cross-sectional view of FIG. (A) A plan view of the rear exterior body, (b) a 7-7 cross-sectional view, and (c) an 8-8 cross-sectional view. (A) A plan view of the rear exterior body, (b) a 7-7 cross-sectional view, and (c) an 8-8 cross-sectional view. It is (a) plan view of the rear exterior body, (b) 7-7 sectional view, (c) 9-9 sectional view, and (d) 8-8 sectional view. It is a perspective view which shows the main part of the inner surface of a diaper in a worn state. It is a perspective view which shows the main part of the inner surface of a diaper in a worn state. (A) is a 5-5 cross-sectional view of FIG. 1 and (b) is a 6-6 cross-sectional view of FIG. It is a perspective view which shows the manufacturing process of the exterior body schematicly. It is a top view which shows various patterns of a hole.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 to 6 show an example 100 of a pants-type disposable diaper. The dotted pattern portion in the cross-sectional view shows an adhesive as a joining means for joining the constituent members located on the front side and the back side thereof, and is a solid, bead, curtain, summit or spiral coating of hot melt adhesive, or pattern coating. (Transfer of hot melt adhesive by letterpress method) or the fixed part of the elastic member is formed by coating the elastic member on the outer peripheral surface of the elastic member such as comb gun or sure wrap coating instead of or together with this. is there. Examples of the hot melt adhesive include EVA type, adhesive rubber type (elastomer type), olefin type, polyester / polyamide type and the like, but they can be used without particular limitation. As a joining means for joining each component, a means by material welding such as a heat seal or an ultrasonic seal can also be used.

The pants-type disposable diaper 100 of this embodiment extends from the front exterior body 12F constituting the front body F, the rear exterior body 12B constituting the rear body B, and the rear exterior body 12B from the front exterior body 12F through the crotch portion. The existing interior body 200 is provided, and both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B are joined to form the side seal portions 12A, whereby the front and rear of the exterior bodies 12F and 12B are formed. The opening formed by the end portion becomes the waist opening WO through which the wearer's body passes, and the portions surrounded by the lower edges of the exterior bodies 12F and 12B and the side edges of the interior body 200 on both sides in the width direction of the interior body 200 form the legs. It becomes the leg opening LO to pass through. The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior bodies 12F and 12B are parts for supporting the interior body 200 with respect to the wearer's body. Further, the reference numeral Y indicates the total length of the diaper in the unfolded state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the rear body B), and the reference numeral X indicates the diaper in the unfolded state. Shows the full width of.

Further, the pants-type disposable diaper 100 of this embodiment forms a waist circumference region T defined as a front-rear direction range (a front-back direction range from the waist opening WO to the upper end of the leg opening LO) having a side seal portion 12A, and a leg opening LO. It has an intermediate region L defined as a front-rear direction range (between a front-rear direction region having a side seal portion 12A of the front body F and a front-rear direction region having a side seal portion 12A of the back body B). The waist circumference region T can be divided into a "waist portion" W that conceptually forms an edge portion of the waist opening and a "waist lower portion" U that is a portion below the waist portion. Normally, when there is a boundary in the waist circumference region T where the stretching stress in the width direction changes (for example, the thickness and elongation rate of the elastic member change), the waist opening WO side is the waist portion W more than the boundary on the waist opening WO side. If there is no such boundary, the waist opening WO side of the absorber 56 or the interior body 200 is the waist portion W. The length in the front-rear direction varies depending on the size of the product and can be appropriately determined. For example, the waist portion W can be 15 to 40 mm and the waist lower portion U can be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are constricted in a U-shape or a curved shape along the circumference of the wearer's leg, and this is a portion along the circumference of the wearer's leg. As a result, the unfolded pants-type disposable diaper has an hourglass shape as a whole.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a top sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbing element 50 interposed between them. Yes, it is the main body that has an absorption function. Reference numeral 40 indicates an intermediate sheet (second sheet) provided between the top sheet 30 and the absorption element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorption element 50. Shows three-dimensional gathers 60 standing on the body side provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

The interior body 200 can be fixed to the exterior bodies 12F and 12B by means of joining by material welding such as heat sealing and ultrasonic sealing, or by a hot melt adhesive. In the illustrated embodiment, the back surface of the interior body 200, that is, in this case, the back surface of the liquid-impermeable sheet 11 and the mounting portion 65 of the three-dimensional gather 60 are fixed to the inner surfaces of the exterior bodies 12F and 12B by a hot melt adhesive. Has been done. The inner / outer fixing portions 201 for fixing the interior body 200 and the exterior bodies 12F and 12B can be provided in almost the entire region where the interior body 200 and the exterior bodies 12F and 12B overlap, and are usually provided in a portion of the interior body excluding both ends in the width direction. preferable.

(Top sheet)
The top sheet 30 has a property of allowing liquid to permeate, and examples thereof include a perforated or non-perforated non-woven fabric and a porous plastic sheet. Further, among these, the non-woven fabric is not particularly limited as to what the raw material fiber is. For example, olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester-based and polyamide-based fibers, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers in which two or more of these are used. Etc. can be exemplified. Further, the non-woven fabric may be produced by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable, and if bulkiness and softness are required, the air through method, point bond method, and thermal bond method are preferable processing methods. ..

Further, the top sheet 30 may be made of one sheet or may be made of a laminated sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the plane direction.

When the three-dimensional gathers 60 are provided, both side portions of the top sheet 30 pass between the liquid-impermeable sheet 11 and the three-dimensional gathers 60 and wrap around to the back side of the absorbing element 50 to prevent the liquid from penetrating. It is preferable to join the transparent sheet 11 and the three-dimensional gather 60.

It is desirable that the top sheet 30 is fixed to a member adjacent to the back side by a joining means by material welding such as a heat seal or an ultrasonic seal or a hot melt adhesive for the purpose of preventing misalignment with respect to the back side member. .. In the illustrated form, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the portion of the packaging sheet 58 located on the front side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.

(Intermediate sheet)
In order to quickly transfer the liquid that has permeated the top sheet 30 to the absorber, an intermediate sheet (also referred to as a "second sheet") 40 having a faster liquid permeation rate than the top sheet 30 can be provided. The intermediate sheet 40 not only rapidly transfers the liquid to the absorber to improve the absorption performance by the absorber, but also prevents the phenomenon of "return" of the absorbed liquid from the absorber, and constantly dries the top sheet 30. Can be in the state of The intermediate sheet 40 may be omitted.

Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spunlace, spunbond, SMS, pulp non-woven fabric, mixed sheet of pulp and rayon, point bond or crepe paper. In particular, the air-through non-woven fabric is preferable because it is bulky. It is preferable to use a composite fiber having a core-sheath structure for the air-through non-woven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw material fiber of the non-woven fabric is preferably 2.0 to 10 dtex. In order to make the non-woven fabric bulky, it is also preferable to use eccentric fibers having no core in the center, hollow fibers, and eccentric and hollow fibers as mixed fibers of all or a part of the raw material fibers.

The intermediate sheet 40 of the illustrated form is arranged in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorber 56, or may be within a short length range centered on the region for receiving the liquid.

It is desirable that the intermediate sheet 40 is fixed to a member adjacent to the back side by a joining means by material welding such as a heat seal or an ultrasonic seal or a hot melt adhesive for the purpose of preventing misalignment with respect to the back side member. .. In the illustrated form, the intermediate sheet 40 is fixed to the surface of the portion of the packaging sheet 58 located on the front side of the absorber 56 by the hot melt adhesive applied to the back surface thereof.

(Liquid impermeable sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited, but for example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated non-woven fabric in which a plastic film is provided on the surface of the non-woven fabric, or a plastic film. An example is a laminated sheet in which a non-woven fabric or the like is laminated and bonded to the surface. For the liquid impermeable sheet 11, it is preferable to use a material having impermeable and moisture permeable properties, which is preferably used from the viewpoint of preventing stuffiness. As a moisture-permeable plastic film, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet and then stretching it in a uniaxial or biaxial direction. Is widely used. In addition to this, non-woven fabrics using microdenyl fibers, leakage-proof strengthening by reducing the voids of the fibers by applying heat or pressure, coating of highly water-absorbent resin or hydrophobic resin or water-repellent agent, etc. Therefore, a liquid-impermeable sheet without using a plastic film can also be used as the liquid-impermeable sheet 11.

As shown in the figure, the liquid-impermeable sheet 11 has a width that fits on the back side of the absorbing element 50, and in order to improve leakage resistance, both sides of the absorbing element 50 are wrapped around the side surface of the top sheet 30 of the absorbing element 50. It can also be extended to both sides. The width of the extending portion is appropriately about 5 to 20 mm on each of the left and right sides.

Further, an excretion indicator whose color changes due to absorption of the liquid can be provided on the inside of the liquid impermeable sheet 11, particularly on the side surface of the absorber 56.

(Three-dimensional gather)
The three-dimensional gather 60 is a band-shaped member extending in the entire front-rear direction along both side portions of the interior body 200, and is for blocking excrement that travels laterally along the top sheet 30 and prevents lateral leakage. It is provided in. The three-dimensional gather 60 of the present embodiment is provided so as to stand up from the side portion of the interior body 200, the portion on the base side stands up diagonally toward the center side in the width direction, and the portion on the tip side from the intermediate portion has a width. It stands diagonally toward the outside in the direction.

More specifically, in the three-dimensional gather 60, a strip-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 is folded back in the width direction and folded in two, and between the folded portion and the sheets in the vicinity thereof. In addition, a plurality of elongated gather elastic members 63 are fixed in an elongated state along the longitudinal direction at intervals in the width direction. The base end portion (the end portion opposite to the seat folded portion in the width direction) located on the opposite side of the tip portion of the three-dimensional gather 60 is a mounting portion 65 fixed to the back surface of the side edge portion of the interior body 200. The portion other than the mounting portion 65 is a protruding portion 66 (a portion on the folded-back portion side) protruding from the mounting portion 65. Further, the protruding portion 66 is composed of a root side portion facing the center side in the width direction and a tip side portion folded outward in the width direction from the tip of the root side portion. This form is a surface contact type three-dimensional gather, but a line contact type three-dimensional gather (not shown) that does not fold outward in the width direction can also be adopted. Of the protruding portions 66, both ends in the front-rear direction are fixed to the side surface of the top sheet 30 in an inverted state, while the front-rear fixing portions 67 located between them are non-intermediate portions in the front-rear direction. A fixed free portion 68 is provided, and a gather elastic member 63 along the front-rear direction is fixed to the free portion 68 in an extended state.

In the free portion 68 of the three-dimensional gather 60, a hot melt adhesive, a heat seal, and ultrasonic waves are used for bonding the inner layer and the outer layer of the gather sheet 62 and fixing the gather elastic member 63 sandwiched between them by various coating methods. At least one of the fixing means by welding the material such as a seal can be used. If the entire inner and outer layers of the gather sheet 62 are bonded together, the flexibility is impaired. Therefore, it is preferable that the parts other than the adhesive portion of the gather elastic member 63 are not adhered or are weakly adhered. In the illustrated embodiment, the gather elastic member 63 is sandwiched between the inner layer and the outer layer of the gather sheet 62 by applying a hot melt adhesive only to the outer peripheral surface of the gather elastic member 63 by a coating means such as a comb gun or a sure wrap nozzle. The structure is such that the elongated elastic member is fixed to the inner layer and the outer layer of the gather sheet 62 and the inner layer and the outer layer of the gather sheet 62 are fixed only by the hot melt adhesive applied to the outer peripheral surface of the gather sheet 62. There is.

Further, for fixing the waterproof film 64 incorporated in the three-dimensional gather 60 and the gather sheet 62 and fixing the front and rear fixing portions 67 to the side surface of the interior body 200, hot melt adhesives and heat seals by various coating methods are used. At least one of the means by welding the material such as or ultrasonic seal can be used. In the illustrated form, slot coating of a hot melt adhesive is used to fix the waterproof film 64. Further, although the means of hot melt adhesive and material welding are combined for fixing the front and rear fixing portions 67 in the illustrated form, these fixing can also be performed by only one of the means.

As the gather sheet 62, a flexible, uniform and concealing non-woven fabric such as a spunbonded non-woven fabric (SS, SSS, etc.), an SMS non-woven fabric (SMS, SMSMS, etc.), a melt-blown non-woven fabric, etc., is water-repellent with silicone or the like, if necessary. The treated material can be preferably used, and the fiber texture is preferably about 10 to ^{30 g / m 2.} As the elongated elastic member 63, thread rubber or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixing is preferably 150 to 350%, more preferably 200 to 300%. The term "elongation rate" means a value when the natural length is 100%. Further, as shown in the drawing, the waterproof film 64 can be interposed between the gather sheets folded in two.

The number of elongated elastic members 63 provided in the free portion of the three-dimensional gather 60 is preferably 2 to 6, and more preferably 3 to 5. The arrangement interval 60d is preferably 3 to 10 mm. With this configuration, it becomes easier for the elongated elastic member 63 to come into contact with the skin in the area where the elongated elastic member 63 is arranged. The elongated elastic member 63 may be arranged not only on the tip side but also on the base side.

The object of fixing the mounting portion 65 of the three-dimensional gather 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable sheet 11, and the absorbing element 50 in the interior body 200.

In the three-dimensional gather 60 thus configured, the contraction force of the elongated elastic member 63 acts to bring both ends in the front-rear direction closer to each other, but the both ends in the front-rear direction of the protruding portion 66 are fixed so as not to stand up. Since there is a non-fixed free part between them, only the free part stands up so as to abut on the body side as shown in FIG. In particular, when the mounting portion 65 is located on the back surface side of the interior body 200, the three-dimensional gathers 60 stand up so as to open outward in the width direction in the crotch portion and its vicinity, so that the three-dimensional gathers 60 hit the legs around the surface. It comes into contact and the fit is improved.

The dimensions of the three-dimensional gather 60 can be appropriately determined, but in the case of baby diapers, for example, as shown in FIG. 3, the standing height of the three-dimensional gather 60 (the length in the width direction of the protruding portion 66 in the unfolded state) W6 is It is preferably 15 to 60 mm, particularly 20 to 40 mm. Further, the separation distance W3 between the innermost folds when the three-dimensional gather 60 is folded flat so as to be parallel to the surface of the top sheet 30 is preferably 60 to 190 mm, particularly 70 to 140 mm.

In addition, unlike the illustrated form, three-dimensional gathers may be provided in double (two rows) on each of the left and right sides of the interior body 200.

(Absorption element)
The absorbing element 50 has an absorbing body 56 and a packaging sheet 58 that encloses the entire absorbing body 56. The packaging sheet 58 may be omitted.

(Absorber)
The absorber 56 can be formed by an aggregate of fibers. The fiber aggregate is obtained by stacking short fibers such as cotton-like pulp and synthetic fibers, and by opening the tow (fiber bundle) of synthetic fibers such as cellulose acetate as necessary. Can also be used. The basis weight of fibers, when fiber stacking flocculent pulp or short fibers, for example, be a 100 to 300 g / m ² approximately, in the case of a filament aggregate, for example, be 30 to 120 g / m ² approximately Can be done. In the case of synthetic fibers, the fineness is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The degree of crimping of the crimped fibers can be, for example, 5 to 75 fibers per 2.54 cm , preferably 10 to 50 fibers, and more preferably about 15 to 50 fibers. Further, in many cases, uniformly crimped crimped fibers are used. It is preferable to disperse and hold the highly absorbent polymer particles in the absorber 56.

The absorber 56 may have a rectangular shape, but as shown in FIGS. 1 and 2, the absorber 56 is located at the front end portion, the rear end portion, and between them, and has a constricted portion that is narrower than the front end portion and the rear end portion. It is preferable that the shape of the hourglass has an hourglass shape, because the fit of the absorber 56 itself and the three-dimensional gather 60 around the legs is improved.

The size of the absorber 56 can be appropriately determined as long as it extends from the front, back, left and right of the urination port position, but it is preferable that the absorber 56 extends to the peripheral edge of the interior body or its vicinity in the front-back direction and the width direction. Reference numeral 56X indicates the width of the absorber 56.

(Highly absorbent polymer particles)
The absorber 56 may contain highly absorbent polymer particles in part or all of it. The highly absorbent polymer particles include "powder" in addition to "particles". As the highly absorbent polymer particles 54, those used for this kind of disposable diaper can be used as they are, for example, sieving with a standard sieve (JIS Z8801-1: 2006) of 500 μm (shaking for 5 minutes). It is desirable that the proportion of particles remaining on the sieve is 30% by weight or less, and the proportion of particles remaining on the sieve is determined by sieving (shaking for 5 minutes) using a standard sieve of 180 μm (JIS Z8801-1: 2006). 60% by weight or more is desirable.

The material of the highly absorbent polymer particles can be used without particular limitation, but those having a water absorption of 40 g / g or more are preferable. Highly absorbent polymer particles include starch-based, cellulosic-based and synthetic polymer-based ones, which are starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and crosslinked sodium carboxymethyl cellulose. A substance or an acrylic acid (salt) polymer or the like can be used. As the shape of the highly absorbent polymer particles, a commonly used powder or granular material is preferable, but other shapes can also be used.

As the highly absorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption rate is too slow, so-called reversion, in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56, is likely to occur.

Further, as the highly absorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. As a result, even when the bulky absorber 56 is used, the sticky feeling after liquid absorption can be effectively suppressed.

The basis weight of the highly absorbent polymer particles can be appropriately determined according to the amount of absorption required for the application of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the basis weight of the polymer ^{is less than 50 g / m 2} , it becomes difficult to secure the absorption amount. Above 350 g / m ² , the effect saturates.

If necessary, the highly absorbent polymer particles can be adjusted in spray density or spray amount in the plane direction of the absorber 56. For example, the amount of liquid excreted at the site can be increased as compared with other sites. When considering the difference between men and women, the spray density (amount) on the front side can be increased for men, and the spray density (amount) on the central part can be increased for women. Further, it is also possible to provide a portion where the polymer does not exist locally (for example, in a spot shape) in the plane direction of the absorber 56.

(Packaging sheet)
When the packaging sheet 58 is used, as the material thereof, tissue paper, particularly crepe paper, non-woven fabric, non-woven fabric of polylami, a sheet having small holes, or the like can be used. However, it is desirable that the sheet does not allow the highly absorbent polymer particles to escape. When a non-woven fabric is used instead of the crepe paper, a hydrophilic SMS non-woven fabric (SMS, SMSMS, etc.) is particularly suitable, and polypropylene, polyethylene / polypropylene composite material, or the like can be used as the material. The basis weight is preferably 5 to 40 g / m ² , especially 10 to 30 g / m ² .

The packaging form of the packaging sheet 58 can be appropriately determined, but from the viewpoint of ease of manufacture and prevention of leakage of highly absorbent polymer particles from the front and rear edge edges, a cylinder is provided so as to surround the front and back surfaces and both side surfaces of the absorber 56. It is preferable that the components are wound in a shape, the front and rear edges thereof are projected from the front and rear of the absorber 56, and the overlapping portions and the overlapping portions of the front and rear protruding portions are joined by a joining means such as hot melt adhesive or material welding.

(Exterior body)
The exterior bodies 12F and 12B are composed of a front exterior body 12F which is a part constituting the front body F and a rear exterior body 12B which is a part constituting the rear body B, and the front exterior body 12F and the rear exterior body 12B. Are not continuous on the crotch side and are separated in the front-back direction. The separation distance 12d can be about 150 to 250 mm. A part of the exposed portion on the back surface of the interior body 200 in this separated portion (for example, the entire portion exposed between the front exterior body 12F and the rear exterior body 12B in the front-rear direction, but does not extend to the front-rear end of the interior body 200. In addition, it is desirable to attach the crotch cover sheet 12M made of a non-woven fabric or the like so as to cover both sides of the interior body 200 so as not to reach both sides of the interior body 200 in the width direction, but it can be omitted. Further, as shown in FIGS. 7 and 8, the exterior body 12 may be integrated through the crotch from the front body F to the back body B. That is, the exterior bodies 12F and 12B separately provided on the front body F and the back body B correspond to the former form, and the integrated exterior body 12 extending from the front body F to the back body B corresponds to the latter form.

The exterior bodies 12F and 12B have a waist circumference portion that is a range in the front-rear direction corresponding to the waist circumference region T. Further, in the present embodiment, the front exterior body 12F does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B has a buttock cover portion 14 extending from the waist circumference region T to the intermediate region L side. doing. Although not shown, the front exterior body 12F may also be provided with an inguinal cover portion extending from the waist circumference region T to the intermediate region L side, or the front exterior body 12F and the front exterior body 12F may be provided with an inguinal cover portion but no groin cover portion. It is not necessary to provide a portion corresponding to the intermediate region L on both of the rear exterior body 12B. Further, in the illustrated embodiment, the lower edge of the buttock cover portion 14 is formed in a straight line along the width direction like the lower edge of the front exterior body 12F, but is located on the waist opening side toward the outside in the width direction. It can also be a curve that looks like this.

As shown in FIGS. 3 to 5, the exterior bodies 12F and 12B have an outer sheet layer 12S located outside the elastic members 15 to 19 and an inner sheet layer 12H located inside the elastic members 15 to 19. , It is bonded by a joining means such as hot melt adhesive or welding. The sheet material forming the outer sheet layer 12S and the sheet material forming the inner sheet layer 12H are individual sheet materials as shown in FIGS. 5 and 8, and a common sheet material (not shown). It can also be.

The sheet material used for the outer sheet layer 12S and the inner sheet layer 12H can be used without particular limitation, but a non-woven fabric is preferable. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, and two of these. A non-woven fabric made of mixed fibers, composite fibers, or the like in which seeds or more are used can be used. Further, the non-woven fabric may be produced by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. When a non-woven fabric is used, the basis weight is preferably about 10 to ^{30 g / m 2.}

Further, the total basis weight of the exterior bodies 12F and 12B is preferably about ^{20 to 60 g / m 2.}

(Expandable area / non-expandable area)
Elastic members 15 to 19 are provided between the outer sheet layer 12S and the inner sheet layer 12H on the outer bodies 12F and 12B in order to improve the fit to the waist circumference of the wearer, and the elastic members expand and contract in the width direction. An elastic region that elastically expands and contracts is formed in. As the elastic members 15 to 19, in addition to using an elongated elastic member such as rubber thread as shown in the figure, a net-like elastic member or a film-like elastic member (elastic film) can also be used. In the stretchable region, in the state of natural length, the outer sheet layer 12S and the inner sheet layer 12H contract with the contraction of the elastic members 15 to 19, and wrinkles or folds are formed, and the elastic members 15 to 19 are in the width direction. When stretched, the outer sheet layer 12S and the inner sheet layer 12H can be stretched to a predetermined stretch rate without wrinkles. As the elastic members 15 to 19, synthetic rubber or natural rubber may be used. For bonding the outer sheet layer 12S and the inner sheet layer 12H on the exterior bodies 12F and 12B and fixing the elastic members 15 to 19 sandwiched between them, a hot melt adhesive, a heat seal, or an ultrasonic seal is used by various coating methods. At least one of the fixing means by welding the material such as the above can be used. If the entire surfaces of the exterior bodies 12F and 12B are firmly fixed, the flexibility is impaired. Therefore, it is preferable that the parts other than the adhesive portion of the elastic members 15 to 19 are not adhered or are weakly adhered. In the illustrated embodiment, the elastic members 15 to 19 are formed by applying a hot melt adhesive only to the outer peripheral surfaces of the elastic members 15 to 19 by a coating means such as a comb gun or a sure wrap nozzle and sandwiching the elastic members 15 to 19 between the sheet layers 12S and 12H. The structure is such that the elastic members 15 to 19 are fixed to both sheet layers 12S and 12H and the elastic members 15 to 19 are fixed between both sheet layers 12S and 12H only by the hot melt adhesive applied to the outer peripheral surface of the sheet. The elastic members 15 to 19 can be fixed to the outer sheet layer 12S and the inner sheet layer 12H only at both ends in the expansion / contraction direction in the expansion / contraction region.

Explaining the illustrated form in more detail, a plurality of waist elastic members 17 are vertically and vertically connected between the outer sheet layer 12S and the inner sheet layer 12H in the waist portion W of the exterior bodies 12F and 12B so as to be continuous over the entire width direction. They are installed at intervals in the direction. Further, among the waist elastic members 17, one or a plurality of the waist elastic members 17 arranged in the region adjacent to the lower waist U may overlap with the interior body 200, or may overlap with the interior body 200 in the width direction center. Except for the portion, it may be provided on both sides in the width direction. The waist elastic member 17 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber, a cross-sectional area of 0.05 to 1.5 mm ^{2 in} the case of natural rubber, particularly 0.1 to 1. It ^{is preferable to provide about 3 to 22 rubber threads (about 0 mm 2} ) at intervals of 4 to 12 mm, and the elongation rate of the waist portion W in the width direction is about 150 to 400%, particularly about 220 to 320%. Is preferable. Further, the waist portion W does not need to use the waist portion elastic member 17 having the same thickness in all directions in the front-rear direction or have the same elongation rate. For example, the thickness of the elastic member 17 at the upper part and the lower portion of the waist portion W The elongation rates may be different.

Further, a plurality of elastic members 15 and 19 in the lower waist portion are attached between the outer seat layer 12S and the inner seat layer 12H in the lower waist portion U of the exterior bodies 12F and 12B at intervals in the vertical direction.

The elastic members 15 and 19 at the lower waist have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , especially 0.1 to 0. It is preferable to provide about 5 to 30 rubber threads of 1 to 15 mm ( ^{about 1.0 mm 2} ) at intervals of 3 to 8 mm, and the elongation rate of the lower waist portion U in the width direction is 200 to 350%. In particular, it is preferably about 240 to 300%.

Further, a plurality of cover portion elastic members 16 are attached between the outer sheet layer 12S and the inner sheet layer 12H in the buttock cover portion 14 of the rear exterior body 12B at intervals in the vertical direction.

The cover elastic member 16 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber, a cross-sectional area of 0.05 to 1.5 ^{mm 2 in} the case of natural rubber, particularly 0.1 to 1.0 mm. ^It is preferable to provide about 2 to 10 rubber threads (about 2) at intervals of 5 to 40 mm, particularly 5 to 20 mm, and the elongation rate in the width direction of the cover portion by this is 150 to 300%, particularly 180 to 260%. Is preferable.

When the inguinal cover portion is provided on the front exterior body 12F, the cover portion elastic member can be provided in the same manner.

When elastic members 15, 16 and 19 are provided in the front-rear direction range having the absorber 56 as in the lower waist portion U and the buttock cover portion 14 in the illustrated form, the width direction of the absorber 56 in a part or all of them. In order to prevent the shrinkage of the body 56, the middle width direction (preferably including the entire inner / outer fixing portion 201) including a part or all of the portion overlapping the absorber 56 in the width direction is defined as the non-stretchable region A1 and the width direction thereof. Both sides are defined as the expansion / contraction region A2. The waist portion W is preferably a stretchable region A2 over the entire width direction, but a non-stretchable region may be provided in the middle in the width direction as in the lower waist portion U.

(Display sheet)
As shown in FIGS. 2 and 5, and 7 and 8, a display sheet 25 having a character or the like printed on the outer surface is provided in the non-stretchable region A1 in at least one of the front exterior body 12F and the rear exterior body 12B. Can be built-in. If the display sheet 25 is provided adjacent to the inner surface of the outermost sheet layer, it is closer to the outer surface of the product and easier to see. Therefore, the display sheet 25 is provided adjacent to the inner surface of the outer sheet layer 12S as shown in the figure. Although it is desirable, it may be provided adjacent to the outer surface of the inner sheet layer 12H, or may be provided adjacent to the inner surface of the inner sheet layer 12H.

(Formation of non-stretchable region)
In the stretchable region A2 and the non-stretchable region A1, elastic members 15 to 17, 19 are supplied between the inner sheet layer 12H and the outer sheet layer 12S in which the display sheet 25 is fixed to the inner surface with a hot melt adhesive to provide elasticity. Members 15, 16 and 19 are fixed at least at both ends in the expansion / contraction direction in the expansion / contraction region A2 via a hot melt adhesive, and are not fixed in the non-expansion / contraction region A1 but elastic in the non-expansion / contraction region A1. The members 15, 16 and 19 are cut by pressurization and heating at one place in the middle in the width direction, or almost the entire elastic members 15, 16 and 19 are finely cut by pressurization and heating and expanded and contracted in the expansion and contraction region A2. The non-stretchable region A1 can be constructed by killing the stretchability while retaining the property.

FIG. 15A shows a case where the elastic members 15, 16 and 19 are cut at one place in the middle in the width direction, and the outer circumference of the pressure portion 71 having the cutting convex portion 72 at one place in the circumferential direction. The display sheet 25 is provided between the inner sheet layer 12H and the outer sheet layer 12S by the seal roll 70 in which the cut convex portion 72 is heated to a desired temperature in preparation for the surface and the surface-smooth anvil roll 80 arranged to face the seal roll 70. The cut target to which the elastic members 15 to 17 and 19 are attached is sandwiched so that the inner sheet layer 12H is on the seal roll side, and only the portion sandwiched between the cutting convex portion 72 and the outer peripheral surface of the anvil roll 80 is the elastic member. 15, 16 and 19 are pressurized and heated to cut. In the product subjected to such processing, at least the compressed portion or the melted portion at the time of cutting remains as a cutting trace 12 m on the outer sheet layer 12S, and an elastic region is formed between the outer sheet layer 12S and the inner sheet layer 12H. Only the cutting residue continuous from the elastic members 15, 16 and 19 of A2 remains as the unnecessary elastic member 18.

Further, FIG. 15B shows a case where almost the entire elastic members 15, 16 and 19 are finely cut, and a pressing portion 71 having a large number of cutting convex portions 73 is provided on the outer peripheral surface, and the cutting convex portions are provided. The display sheet 25 and the elastic members 15 to 17 between the inner sheet layer 12H and the outer sheet layer 12S are provided by the seal roll 70 in which the 72 is heated to a desired temperature and the surface-smooth anvil roll 80 arranged opposite to the seal roll 70. The cutting target to which 19 is attached is sandwiched so that the inner sheet layer 12H is on the seal roll side, and elastic members 15, 16 and 19 are added only to the portions sandwiched between the cutting convex portion 73 and the outer peripheral surface of the anvil roll 80. It cuts by pressing and heating. In the product subjected to such processing, at least the compressed portion or the melted portion at the time of cutting remains as a cutting trace 12 m on the outer sheet layer 12S, and an elastic region is formed between the outer sheet layer 12S and the inner sheet layer 12H. The cutting residue continuous from the elastic members 15, 16 and 19 of A2 and the cut pieces of the elastic member not continuous with the elastic members 15, 16 and 19 of both elastic regions A2 remain as unnecessary elastic members 18.

The heating temperature (temperature of the cutting convex portion) for cutting the elastic members 15, 16 and 19 may be appropriately determined as long as the elastic members 15, 16 and 19 can be reliably cut, but the production line is high speed. In order to reliably cut the elastic members 15, 16 and 19 and prevent the cut portions of the elastic members 15, 16 and 19 from adhering to the surrounding members, the temperature is lower than the melting point of the elastic members 15, 16 and 19. However, it is preferable that the temperature is sufficiently high. When the elastic members 15, 16 and 19 are cut at such a high temperature, when the melting points of the outer sheet layer 12S and the inner sheet layer 12H are lower than the cutting temperature, the inner sheet layer 12H is subjected to the elastic members 15, 16 and 19. Although there is a possibility that melting marks may remain or holes may be formed at the cut portion, the influence on the outer sheet layer 12S is reduced by the heat insulating effect of the display sheet 25. Generally, the melting points of the non-woven fabrics used for the outer sheet layer 12S and the inner sheet layer 12H are about 160 to 175 ° C., the melting points of the elastic members 15, 16 and 19 are about 200 to 230 ° C., and the heating temperature is 180 to 180 to 180. It can be 200 ° C.

(Pocket for inserting absorbent material)
Characteristically, as shown in FIGS. 1 and 5, a pocket 20 for inserting an absorbent material having an insertion port 21 on the waist opening WO side is provided inside the elastic members 15 to 17 in the rear exterior body 12B. At the same time, a large number of holes 22 penetrating inside and outside the pocket 20 are formed on the wall portion of the pocket 20 on the skin side at intervals. As shown in FIGS. 9 and 12, the user inserts an appropriate disposable absorbent 28 such as rolled or folded tissue paper, toilet paper, or a non-woven fabric having water absorbency into the pocket 20 as necessary. This makes it possible to fill the gap between the diaper and the wearer's back, which causes back leakage. Moreover, since not only the gap is filled but also a large number of holes 22 are formed in the portion, the absorbent material 28 in the pocket 20 can auxiliary absorb and hold the liquid content through the holes 22. , It becomes possible to prevent back leakage more effectively.

The number of pockets 20 is not particularly limited, and one or more pockets may be provided. For example, as shown in FIGS. 11 and 13, it is preferable that a plurality of vertically elongated pockets 20 are provided in the width direction because the user can freely select the pocket 20 into which the absorbent material 28 is inserted. Further, it is preferable that the gap filling action of each pocket 20 functions independently, so that the fit to the unevenness of the back of the wearer is improved.

The pocket 20 can be provided at an arbitrary position in the width direction of the rear exterior body 12B, but the interior body 200 is provided in an intermediate region in the width direction in which back leakage is likely to occur, particularly as shown in FIGS. 9 to 11. It is preferable to provide it within the range in the width direction of the body. When the number of pockets 20 is an odd number, it is desirable to provide them in the central portion in the width direction as shown in FIG.

The size of the pocket 20 (inner space) is not particularly limited, but when a rolled or folded tissue paper is inserted, the length 20x in the width direction WD is preferably about 40 to 50 mm. The length 20y of the anteroposterior LD of the pocket 20 (inner space) is preferably about 30 to 50% of the anteroposterior LD spacing of 200d between the rear end of the absorber 56 and the edge of the waist opening WO. In particular, the crotch-side end of the pocket 20 may overlap the rear end of the absorber 56, but it is desirable that the pocket 20 is located on the same side as the rear end of the absorber 56 or on the waist opening WO side. The crotch-side end of the pocket 20 may or may not overlap the rear end of the interior body 200.

The formation region of the hole 22 in the pocket 20 is not particularly limited, and the hole 22 can be formed over the entire front-rear direction. It is desirable that no hole 22 is provided at least at the end of the waist opening on the WO side.

The planar shape (opening shape) of the individual holes 22 provided in the pocket 20 can be appropriately determined, and has an elongated hole shape as shown in FIGS. 16 (a) and 16 (b), as well as FIGS. 16 (c) and 16 (e). ), An ellipse as shown in FIG. 16D, a polygon such as a triangle, a rectangle, and a rhombus, a star shape, a cloud shape, or any other shape can be used. The dimensions of the individual holes 22 are not particularly limited, but the maximum dimension 22L of the front-rear direction LD is preferably 0.5 to 5 mm, and the maximum dimension 22W of the width direction WD is preferably 0.5 to 5 mm. When the shape of the hole 22 is long in one direction such as an elongated hole, an ellipse, a rectangle, a rhombus, etc., it is desirable that the longitudinal direction of the hole 22 is the front-back LD, but the width direction WD or the diagonal direction. It may be.

The area and area ratio of each hole 22 may be appropriately determined, but the area is ^{preferably about 0.25 to 25 mm 2} , and the area ratio (total area of holes in the hole forming region) is 10 to 30%. It is preferably about.

The plane arrangement of the holes 22 can be appropriately determined, but a plane arrangement that is repeated regularly is preferable, and a diagonal lattice shape as shown in FIG. 16A or a hexagonal lattice shape as shown in FIG. 16B is preferable. (These are also called staggered), a square lattice as shown in FIG. 16 (c), a rectangular lattice as shown in FIG. 16 (d), and a parallel lattice as shown in FIG. 16 (e) (in the figure). (A form in which two groups of parallel diagonal rows are provided so as to intersect each other), etc. (including those inclined at an angle of less than 90 degrees with respect to the expansion / contraction direction ED). In addition to the ones that are regularly repeated, the group of holes 22 (the arrangement of the group units may be regular or irregular, and may be a pattern, a character shape, etc.) may be regularly repeated.

The front-rear direction spacing 22y and the width direction spacing 22x of the holes 22 can be appropriately determined, but in the normal case, it is desirable to set them to about 1 to 20 mm, respectively.

Even if the hole 22 is a punched hole 22 whose edge is formed by a cut end of a fiber, the edge of the hole 22 has almost no cut end of the fiber, and a pin is inserted between the fibers and expanded. It may be the formed non-punched hole 22 (high fiber density at the edge). Further, it is desirable that the fibers at the edges of the holes 22 are fused to each other, but the fibers may not be fused.

A dedicated sheet may be separately attached to the rear exterior body 12B of the pocket 20, but if the pocket 20 is formed by using the sheet material forming the exterior bodies 12 and 12B as shown in the illustrated embodiment, the pocket 20 will be described later. It can be manufactured without increasing the manufacturing process. Moreover, although a water-repellent or hydrophobic non-woven fabric is widely used as the material of the exterior bodies 12 and 12B, in the present invention, since a large number of holes 22 are formed in the pocket 20, the absorption function of the pocket 20 is hindered. There is no such thing. More specifically, as shown in the illustrated figure, the non-woven fabric forming the outer sheet layer 12S is folded back inward from the inner sheet layer 12H and the outer sheet layer 12S at the edge of the waist opening WO, and the folded portion 12R Has a back side portion 23 extending from the waist opening WO to the crotch side and a front side portion 24 folded back on the crotch side and extending to the waist opening WO side, and a side joint for joining the front side portion 24 and the back side portion 23. It is one preferable form that at least a pair of portions 26 are provided at intervals in the width direction WD, and the non-joint portion between these side joint portions 26 is a pocket 20. In the cross-sectional view, the hot melt adhesive for forming the side joint portion 26 is indicated by reference numeral H1. As shown in FIG. 10, the side joint portion 26 may be provided only in the vicinity of both sides of the pocket 20. Although not shown, instead of the non-woven fabric forming the outer sheet layer 12S, the non-woven fabric forming the inner sheet layer 12H is folded back inward from the inner sheet layer 12H and the outer sheet layer 12S at the edge of the waist opening WO, and this folded back. The pocket 20 may be formed by the portion.

As shown in FIG. 14, the non-woven fabric forming both the inner sheet layer 12H and the outer sheet layer 12S is folded inward from the inner sheet layer 12H and the outer sheet layer 12S at the edge of the waist opening WO, and is folded back. The portion 12R has a back side portion 23 extending from the waist opening WO to the crotch side and a front side portion 24 folded back on the crotch side and extending to the waist opening WO side, and a portion located on the front side of the pocket 20 in the front side portion 24. It is also a preferable form that the pocket elastic member 27 elastically expands and contracts in the width direction WD is provided between the non-woven fabrics of the above. As a result, the front side portion 24, which is the skin side wall portion of the pocket 20, is elastically pressed against the back side portion 23, so that the absorbent material 28 inserted in the pocket 20 is firmly held in the pocket 20. become. In the illustrated form, the elongated pocket elastic member 27 is provided over the entire width direction WD of the rear exterior body 12B, and the entire width including the portion other than the pocket 20 expands and contracts. Other than that, the pocket elastic member 27 may not be provided or may be cut into small pieces to form a non-stretchable region. Further, although not shown, the same effect can be obtained by adopting a stretchable non-woven fabric that elastically expands and contracts by itself as the non-woven fabric forming the front side portion 24.

As shown in FIG. 11, a plurality of vertically elongated pockets 20 are provided at intervals in the width direction WD, and in the portion between the adjacent pockets 20, the back side portion 23 is provided as shown in FIG. 11 (c). A form that is not joined to the outer member (the surface of the interior body 200 and the inner sheet layer 12H of the exterior body 12 in the illustrated form) is also a preferable form.

In this embodiment, as shown in FIG. 13, by inserting the absorbent material 28 for filling the gap in both of the adjacent pockets 20, the back side portion 23 of the portion 20D located between the adjacent pockets 20 is formed. A gap 29 (see FIG. 11C) that rises from the outer member (the surface of the interior body 200 and the inner sheet layer 12H of the exterior body 12 in the illustrated embodiment) and opens to the crotch side is formed. Therefore, at the site of the pocket 20, the gap is filled with the absorbent material 28 inserted into the pocket 20 to prevent the leakage of excrement, and the space between the adjacent pockets 20 is opened on the crotch side (a two-dot chain line in FIG. 13). Leakage can be prevented by introducing excrement into the gap 29 (shown) and damming it. In particular, it is one desirable form to have a structure in which the recesses on both sides of the lumbar spine are filled by inserting the absorbent material 28 into the pocket 20 and the lumbar spine is dammed by the gap 29 between the back side portion 23 between the pockets 20 and the inner sheet layer 12H. Is.

Further, as shown in FIG. 10, the portion of the back side portion 23 located on the back side of the pocket 20 is attached to the outer member (in the illustrated form, the surface of the interior body 200 and the inner sheet layer 12H of the exterior body 12). Although they may be joined to each other, as shown in FIG. 9 and the like, the portion of the back side portion 23 located on the back side of the pocket 20 is an outer member (in the illustrated embodiment, the surface of the interior body 200 and the inside of the exterior body 12). It is also possible to form a form that is not bonded to the sheet layer 12H). In the latter case, as shown in FIG. 9 and the like, if a large number of holes 22 penetrating inside and outside the pocket 20 are formed on the back side portion 23 at intervals, only from the skin side (front side) of the pocket 20. It is preferable because it can be absorbed into the pocket 20 from the back side as well. In the cross-sectional view, a hot melt adhesive for joining the back side portion 23 to the outer member thereof is indicated by reference numeral H2.

On the other hand, as described above, when the pocket 20 is formed by using the sheet material forming the rear exterior body 12B, as shown in FIG. 15, a hole is formed in the seal roll 70 for cutting the elastic member. A perforated convex portion 74 for the purpose is provided, and at the same time as cutting the elastic members 15, 16 and 19, holes 22 are provided at predetermined positions of the sheet material forming the rear exterior body 12B, and then the portion having the holes 22 is folded. By forming the above-mentioned side joint portion 26, the above-mentioned pocket 20 can be formed without adding a new step.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
-The "front-back (vertical) direction" means the direction connecting the ventral side (front side) and the dorsal side (rear side), and the "width direction" means the direction orthogonal to the front-back direction (horizontal direction).
-"Elongation rate" means a value when the natural length is 100%.
-"Gel strength" is measured as follows. Artificial urine (urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, ion-exchanged water: 97.09 wt%) 49 To 0.0 g, add 1.0 g of the highly absorbent polymer and stir with a stirrer. The produced gel is left in a constant temperature and humidity chamber at 40 ° C. × 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500 manufactured by I. techno Engineering).
・ "Metsuke" is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device in a standard state (the test place is a temperature of 20 ± 5 ° C. and a relative humidity of 65% or less) to bring it into a constant weight state. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. It is not necessary to pre-dry the fibers having an official moisture content of 0.0%. A sample having a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight state using a paper density plate (200 mm × 250 mm, ± 2 mm). Weigh the sample, calculate the weight per square meter, and use it as a basis weight.
-"Thickness" is automatically measured using an automatic thickness measuring device (KES-G5 handy compression measurement program) under the conditions of load: 0.098 N / cm ² and pressurized area: 2 cm ^2.
-The amount of water absorption is measured by JIS K7223-1996 "Method for testing the amount of water absorption of a highly water-absorbent resin".
-The water absorption rate shall be the "time to the end point" when JIS K7224-1996 "Water absorption rate test method for highly water-absorbent resin" was performed using 2 g of highly absorbent polymer and 50 g of physiological saline. ..
-If there is no description about the environmental conditions in the test or measurement, the test or measurement shall be performed in a test room or equipment under standard conditions (test location: temperature 20 ± 5 ° C, relative humidity 65% or less). ..

The present invention can be used for pants-type disposable diapers such as those described above.

A1 ... non-stretchable area, A2 ... stretchable area, B ... back body, F ... front body, L ... intermediate area, LD ... front-back direction, LO ... leg opening, T ... waist area, U ... lower waist, W ... waist, WD ... width direction, WO ... waist opening, 11 ... liquid permeable sheet, 12 ... exterior, 12A ... side seal, 12B ... rear exterior, 12F ... front exterior, 12H ... inner sheet Layer, 12m ... Cutting trace, 12S ... Outer sheet layer, 14 ... Butt cover, 18 ... Unnecessary elastic member, 20 ... Pocket, 21 ... Insertion, 22 ... Hole, 23 ... Back side, 24 ... Front side, 25 ... Display sheet, 26 ... Side joint, 27 ... Pocket elastic member, 28 ... Absorbent, 29 ... Gap, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbent element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... 3D gather, 62 ... Gather sheet, 200 ... Interior body, 201 ... Inner / outer fixed part.

Claims (6)

An integrated exterior body from the front body to the back body, or an exterior body separately provided on the front body and the back body,
It is provided with an interior body including an absorber, which extends in the front-rear direction from the front body to the back body and is joined to the exterior body.
A side seal portion in which both side portions of the exterior body on the front body and both side portions of the exterior body on the rear body are joined, respectively.
In a pants-type disposable diaper with a waist opening and a pair of left and right leg openings.
An elastic member that elastically expands and contracts in the width direction is provided on the exterior body of the rear body in the waist circumference region that corresponds to the side seal portion in the front-rear direction.
Inside the elastic member of the exterior body of the back body, a pocket for inserting an absorbent material having an insertion port on the waist opening side is provided, and on the wall portion on the skin side of this pocket, inside and outside the pocket. Many holes to penetrate are formed at intervals ,
The exterior body of the back body has an inner sheet layer and an outer sheet layer, and the elastic member is sandwiched between the inner sheet layer and the outer sheet layer.
The non-woven fabric forming at least one of the inner sheet layer and the outer sheet layer is folded inward from the inner sheet layer and the outer sheet layer at the edge of the waist opening, and the folded portion is from the waist opening to the crotch side. It has a back side part that extends to the crotch side and a front side part that is folded back on the crotch side and extends to the waist opening side.
At least a pair of joints for joining the front side portion and the back side portion are provided at intervals in the width direction, and the non-joint portion between these joint portions is the pocket .
Pants-type disposable diapers that feature this. The inner sheet layer and the outer sheet layer are each made of a water-repellent or hydrophobic non-woven fabric.
The pants-type disposable diaper according to claim 1. The non-woven fabric forming both the inner sheet layer and the outer sheet layer is folded inward from the inner sheet layer and the outer sheet layer at the edge of the waist opening, and the folded portion is moved from the waist opening to the crotch side. It has a back side part that extends and a front side part that is folded back on the crotch side and extends to the waist opening side.
An elastic member that elastically expands and contracts in the width direction is provided between the non-woven fabrics of the portion of the front side portion located on the front side of the pocket.
The pants-type disposable diaper according to claim 1 or 2. As the pocket, a plurality of vertically elongated pockets are provided at intervals in the width direction, and in the portion located between the adjacent pockets, the back side portion is not joined to the member located on the outside thereof.
The pants-type disposable diaper according to any one of claims 1 to 3. The portion of the back side portion located on the back side of the pocket is not joined to the member located on the outside thereof, and a large number of holes penetrating inside and outside the pocket are also formed on the back side portion at intervals. ing,
The pants-type disposable diaper according to any one of claims 1 to 4. As the pocket, a plurality of vertically elongated pockets are provided in the width direction within the width direction range having the interior body.
The pants-type disposable diaper according to any one of claims 1 to 5.

Images