JP2016178991A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve diffusivity while preventing occurrences of twist and cleft of an absorber and decrease in an amount of absorption.SOLUTION: The disposable diaper is characterized in that a coating area rate of at least one of a top-sheet hot-melt adhesive 31 for sticking a top sheet 30 to a back-side member thereof, an intermediate-sheet hot-melt adhesive 41 for sticking an intermediate sheet 40 to a back-side member thereof, and a wrapper-sheet hot-melt adhesive 51 for sticking a wrapper sheet 58 to a surface of an absorber 56 is set higher than that of a peripheral area thereof in a diffusion-promoted area 70 including an urination port position 71 and being inward separated from an inner peripheral edge of the absorber 56.SELECTED DRAWING: Figure 9

Description

  The present invention relates to improvement of diffusibility in a disposable diaper.

  In the disposable diaper, various absorption performances are required, and one of typical examples is diffusibility. It can be said that the diffusibility represents the size of the area used for absorption in the absorber. Therefore, if the diffusibility is low, even if a large amount of absorption is secured as a whole of the absorber, the absorption is likely to be saturated and leakage is likely to occur. For this reason, conventionally, various techniques for improving the diffusibility have been proposed.

  As a typical example of such a diffusivity improving technique, it is known to form grooves (slits or recesses) extending in the front-rear direction in the absorber (see, for example, Patent Document 1).

  However, when a groove is formed in the absorber, when the groove is enlarged with emphasis on diffusibility, problems such as the occurrence of warping or cracking in the absorber, and the amount of absorption reduced by the amount of the groove. There is a point.

JP 2010-131206 A JP 2011-189065 A

  Then, the main subject of this invention is to propose the technique which improves a diffusivity, preventing generation | occurrence | production of the deflection | flour and crack of an absorber, and the fall of absorption amount.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
In a disposable diaper comprising an absorbent body that absorbs and retains excrement over the front, back, left and right of the urination port position, and one or more liquid-permeable sheet layers located on the front side of the absorbent body,
At least one pair of members adjacent to each other in the front and back direction of the absorbent body and the liquid permeable sheet layer is bonded with a hot melt adhesive, includes the urination port position, and is spaced apart from the periphery of the absorbent body. A disposable diaper characterized in that the region is a diffusion promoting region having a higher application area ratio of the hot melt adhesive than the surrounding region.

(Function and effect)
Hot melt adhesives are widely used for adhering disposable diapers, and are also used for adhering between adjacent members in the front and back direction on the front side of the absorbent body, because hot melt adhesives do not have liquid permeability On the front side of the absorber, the coating pattern was intermittent and the coating area ratio was kept as low as possible. In the present invention, the influence of the hot melt adhesive is used in reverse. In the diffusion promoting region, the application area ratio of the hot melt adhesive (the adhesive per unit area is less than the surrounding region). If the urination is present, it is less likely to permeate to the absorber side than the surroundings, and as a result, movement (diffusion) to the surroundings is promoted. become. In the present invention, it is only necessary to change the application pattern of the hot melt adhesive that is normally used, so unlike the technique of providing grooves in the absorbent body, while preventing the occurrence of twisting and cracking of the absorbent body and a decrease in the amount of absorption, Diffusibility can be improved.

  In addition, the thing of patent document 2 provides a water-repellent part in order to prevent wet-back (return), and although this water-repellent part also has the effect | action which improves a diffusivity, the process which provides a water-repellent part Is required, which increases the cost. On the other hand, in the present invention, since the application pattern of the hot melt adhesive that is usually used is only changed, there is an advantage that such a problem does not fundamentally occur.

  Here, in the present invention, “at least a pair of members are bonded with a hot melt adhesive, and the application area ratio of the hot melt adhesive includes the position of the urination port and is inside the periphery of the absorber. In a diffusion promoting region that is spaced apart from each other, a layer of hot melt adhesive that adheres between the pair of members exists over the diffusion promoting region and the surrounding region. Both the form and the form of the hot melt adhesive layer that adheres between the set of members are present only in the diffusion promoting region and not in the surrounding region, and the latter form includes In addition to a form in which the set of members are not bonded in the surrounding area, a form in which one of the set of members exists only in the diffusion promoting area is also included.

<Invention of Claim 2>
As the liquid-permeable sheet layer, a top sheet constituting a diaper surface, a hydrophilic intermediate sheet that is the same as or wider than the diffusion promoting region, and a package sheet that wraps the absorbent body, the absorbent body. The part located on the front side is provided in this order from the front side to the back side,
An intermediate sheet hot melt adhesive that adheres the intermediate sheet to a portion of the packaging sheet located on the front side of the absorber is applied so that the application area ratio is higher in the diffusion promoting region than in the surrounding region. ing,
The disposable diaper according to claim 1.

(Function and effect)
In the disposable diaper, the liquid permeable sheet layer positioned on the front side of the absorbent body is generally provided with the top sheet, the intermediate sheet, and the packaging sheet as described above. In this case, as the hot melt adhesive for increasing the coating area ratio of the diffusion promoting region, (a) a top sheet hot melt applied to the back surface of the top sheet in order to fix the top sheet to a member adjacent to the back side Adhesive, (b) Intermediate sheet hot melt adhesive applied to the back side of the intermediate sheet to fix the intermediate sheet to a member adjacent to the back side, (C) Positioned on the surface of the absorbent body of the packaging sheet In order to fix the portion to be fixed to the absorbent body, a packaging sheet hot melt adhesive applied to the inner surface of the packaging sheet is conceivable.

  However, if the application area ratio of the top sheet hot melt adhesive is increased in the diffusion promoting region, the hot melt adhesive may come into contact with and adhere to the skin. In this case, since diffusibility of urine is improved on the top sheet, there is a risk of leakage depending on the degree. In addition, if the application area ratio of the packaging sheet hot melt adhesive is increased in the diffusion promoting region, contact with the skin can be prevented, but there is a possibility that the urine supply to the backside part may be hindered and the absorption amount is reduced. There is a risk. On the other hand, when the application area ratio of the intermediate sheet hot melt adhesive is increased in the diffusion promoting region, the diffusion is mainly in the front / rear / left / right direction in the intermediate sheet, so that the problem assumed in other forms occurs. It becomes difficult to do.

<Invention of Claim 3>
The disposable diaper according to claim 2, wherein the intermediate sheet is wider than the diffusion promoting region.

(Function and effect)
When configured in this manner, the application area ratio of the hot melt adhesive is narrower than the diffusion promoting region in the portion on the peripheral side of the intermediate sheet. The urine diffused in the intermediate sheet is efficiently supplied to the back side.

<Invention of Claim 4>
Top sheet hot melt adhesive for adhering the top sheet to a member adjacent to the back side thereof, and packaging sheet hot melt adhesive for adhering a portion of the packaging sheet located on the front side of the absorber to the surface of the absorber Have
The application basis weight of the top sheet hot melt adhesive and the application basis weight of the packaging sheet hot melt adhesive are lower than the application basis weight of the intermediate sheet hot melt adhesive,
The disposable diaper according to claim 2 or 3.

(Function and effect)
When the top sheet, the intermediate sheet, the packaging sheet, and the absorbent body are bonded to each other by a hot melt adhesive, the diffusion of urine is mainly on the intermediate sheet rather than on the top sheet. This is preferable because the transfer of urine after diffusion to the absorber is quick. The application basis weight of the hot melt adhesive means an application weight (g / m ² ) per unit area.

<Invention of Claim 5>
It goes around the front side through the width direction from the back side of the absorber, and comprises a packaging sheet in which the ends are overlapped on the front side of the absorber,
The portion where the end portions of the packaging sheet overlap each other is provided so as to pass through the diffusion promoting region,
The disposable diaper of any one of Claims 1-4.

(Function and effect)
Since the overlapping part of the packaging sheet has low liquid permeability compared to the non-overlapping part, the diffusibility of the diffusion promoting area can be further improved by providing the overlapping part through the diffusion promoting area as described above. .

<Invention of Claim 6>
As the liquid permeable sheet layer, a top sheet constituting a diaper surface is provided. In the diffusion promoting region, the top sheet surface is not uneven, and in the surrounding region, the top sheet surface is formed. The disposable diaper of any one of Claims 1-5 in which many unevenness | corrugations are formed.

(Function and effect)
In the region around the diffusion promoting region, if the diffusibility is lowered and the absorption into the absorber is not promoted, there is a risk of leakage. Therefore, as described above, in a region around the diffusion promoting region, it is one preferable embodiment that a large number of irregularities are formed on the surface of the top sheet and the diffusivity is lowered by the irregular barrier.

<Invention of Claim 7>
The disposable part of any one of Claims 1-6 in which the side part embossing recessed part which cuts in from the diaper surface to an absorber is formed in the width direction both ends of the diffusion promotion area | region, or the width direction outer side of a diffusion promotion area | region, respectively. Diapers.

(Function and effect)
When such a side embossed recess is provided, the cross-sectional shape in the width direction becomes a mountain shape whose thickness decreases toward the side embossed recess, and in the diffusion promoting region, the diffusivity is increased by the inclination from the urination position to the side embossed recess. In the outer side in the width direction of the diffusion promoting region, the diffusion toward the outer side in the width direction is suppressed by the inclination toward the side embossed concave portion, so that it becomes difficult to leak while improving the diffusibility. In addition, the liquid-permeable sheet layer is firmly adhered to the absorbent body by the side embossed recesses, and the movement of urine to the absorbent body is promoted, so that the liquid residue in the liquid-permeable sheet layer is reduced and the surface of the diaper is dry. It is possible to improve the performance of keeping the touch (dry touch).

<Invention of Claim 8>
The application area ratio of the hot melt adhesive in the diffusion promoting region is 90 to 100%, and the application area ratio of the hot melt adhesive in the surrounding region is 5 to 60%. The disposable diaper of Claim 1.

(Function and effect)
The difference in the application area ratio of the hot melt adhesive may be determined as appropriate, but is preferably in the above range.

  As described above, according to the present invention, there are advantages such as the ability to improve the diffusibility while preventing the occurrence of deflection and cracking of the absorber and the decrease in the amount of absorption.

It is a top view in the state where the diaper was developed showing the inside of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. It is a top view in the state where the diaper was developed showing only the principal part of a pants type disposable diaper. It is sectional drawing which shows only the principal part of a pants type disposable diaper. It is a perspective view of a pants type disposable diaper. It is 6-6 sectional drawing of Fig.10 (a) which shows only the principal part of an interior body. It is a top view which shows only the principal part of an interior body. It is a top view which shows only the principal part of an interior body. It is a top view which shows only the principal part of an interior body. It is a top view which shows only the principal part of an interior body. It is sectional drawing which expands and shows the principal part of an interior body. It is sectional drawing which shows only the principal part of an interior body. It is a top view which shows only the principal part of an interior body.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 to 8 show an example 100 of a pants-type disposable diaper. The dotted pattern 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, and is a solid, bead, curtain, summit or spiral coating of hot melt adhesive, or pattern coating (Transfer of hot melt adhesive in a relief printing system) or the like, or the fixed portion of the elastic stretchable member is formed by application to the outer peripheral surface of an elastic stretchable member such as a comb gun or a shroud coating instead of or together with this Is. Examples of hot melt adhesives include EVA, adhesive rubber (elastomer), olefin, and polyester / polyamide types, which can be used without any particular limitation. As a joining means for joining the constituent members, means by material welding such as heat sealing or ultrasonic sealing can be used.

  The pants-type disposable diaper 100 of this embodiment is provided inside the exterior body 12 so as to extend from the front body F to the back body B through the crotch part from the exterior body 12 constituting the front body F and the back body B. And the both side portions of the outer body 12 of the front body F and the both side portions of the outer body 12 of the rear body B are joined to form the side seal portion 12A. The opening formed by the front and rear end portions of the body becomes a waist opening WO through which the wearer's torso passes, and the portions not joined by the side seal portions 12A on both sides in the width direction of the exterior body 12 become leg opening portions LO through which the legs pass. Is. The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior body 12 is a part that supports the interior body 200 with respect to the wearer's body. Symbol Y indicates the total length of the diaper in the unfolded state (vertical length from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and symbol X indicates the diaper in the unfolded state. The full width of is shown.

  Further, the pants-type disposable diaper 100 of this embodiment forms a waist region T defined as a longitudinal range (a longitudinal range extending from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A, and a leg opening LO. And an intermediate region L defined as a front-rear direction range (between a longitudinal region having the side seal portion 12A of the front body F and a longitudinal region having the side seal portion 12A of the rear body B). The waistline region T can be divided into a “waist portion” W that conceptually forms the edge of the waist opening and a “waist lower portion” U that is a lower portion than this. Usually, in the case where there is a boundary in the waistline region T in which the width direction expansion / contraction stress changes (for example, the thickness or elongation rate of the elastic expansion / contraction member changes), the waist opening WO side is closer to the waist opening than the boundary on the waist opening WO side. When there is no such boundary, the waist opening WO side becomes the waist portion W with respect to the absorbent body 56 or the interior body 200. These lengths in the vertical direction vary depending on the size of the product and can be determined as appropriate. For example, the waist portion W may be 15 to 40 mm and the waist lower portion U may be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are wrapped in a U-shape or a curved shape along the circumference of the leg of the wearer, and this is a portion into which the wearer's leg is put. As a result, the unfolded pants-type disposable diaper has a substantially 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 absorbent element 50 interposed therebetween. Yes, it is the main body that has the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows a three-dimensional gather 60 that stands on the body side and is 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 body 12 by a joining means by material welding such as heat sealing or ultrasonic sealing, or by a hot melt adhesive. In the illustrated embodiment, the inner surface 200 is fixed to the inner surface of the exterior body 12 by a hot melt adhesive applied to the rear surface of the interior body 200, that is, in this case, the back surface of the liquid-impermeable sheet 11 and the attachment portion 65 of the three-dimensional gather 60. Yes.

(Top sheet)
The top sheet 30 has a property of allowing liquid to pass through, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured 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. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .

  The top sheet 30 may be composed of a single sheet or a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

  In the case of providing the three-dimensional gather 60, both sides of the top sheet 30 pass between the liquid-impermeable sheet 11 and the three-dimensional gather 60 to reach the back side of the absorbent element 50, in order to prevent liquid penetration. It is preferable to join to the permeable sheet 11 and the three-dimensional gather 60.

  The top sheet 30 is fixed to a member adjacent to the back side by a joining means by material welding such as heat sealing or ultrasonic sealing or a top sheet hot melt adhesive 31 for the purpose of preventing displacement with respect to the back side member. It is desirable. In the illustrated form, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the packaging sheet 58 on the front side of the absorber 56 by the top sheet hot melt adhesive 31 applied to the back surface thereof.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided in order to quickly transfer the liquid that has permeated through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance by the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven 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 fiber of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

  The intermediate sheet 40 in the illustrated form is disposed 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 absorbent body 56 or may be within a short length range centered on the region that receives the liquid.

  The intermediate sheet 40 is fixed to a member adjacent to the back side by a joining means by material welding such as heat sealing or ultrasonic sealing, or an intermediate sheet hot melt adhesive 41 for the purpose of preventing positional displacement with respect to the back side member. It is desirable. 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 absorbent body 56 by an intermediate sheet hot melt adhesive 41 applied to the back surface thereof.

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric provided with a plastic film on the surface of the nonwoven fabric, or a plastic film For example, a laminated sheet in which a nonwoven fabric or the like is laminated and bonded to each other can be exemplified. For the liquid-impermeable sheet 11, it is preferable to use a liquid-impervious and moisture-permeable material that is preferably used from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using microdenier fiber, enhancement of leakproofness by reducing the voids of the fiber by applying heat or pressure, application of superabsorbent resin or hydrophobic resin or water repellent Thus, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11.

  The liquid-impermeable sheet 11 has a width that can be accommodated on the back side of the absorbent element 50 as shown in the drawing, and in order to improve leakage prevention, the liquid-impermeable sheet 11 wraps around both sides of the absorbent element 50 to form the side surface of the top sheet 30 of the absorbent element 50. It can also extend to both sides. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

  Moreover, the excretion indicator from which a color changes by absorption of a liquid part can be provided in the inner side of the liquid-impermeable sheet 11, especially the absorber 56 side surface.

(Three-dimensional gather)
The three-dimensional gather 60 is a belt-like member that extends over the entire front-rear direction along both side portions of the interior body 200, blocks excrement that travels in the lateral direction along the top sheet 30, and prevents side leakage. Is provided. 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 base side portion rises obliquely toward the center in the width direction, and the tip side portion from the intermediate portion has a width. It stands up diagonally outward in the direction.

  More specifically, the three-dimensional gather 60 folds the belt-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction and folds it into two. In addition, a plurality of elongated gather elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. A base end portion (an end portion on the side opposite to the sheet folding portion in the width direction) located on the opposite side to the front end portion of the three-dimensional gather 60 is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200. A portion other than the attachment portion 65 is a protruding portion 66 (a portion on the folded portion side) protruding from the attachment portion 65. The projecting portion 66 includes a base side portion that extends toward the center in the width direction, and a tip side portion that is folded back outward in the width direction from the tip of the base side portion. This form is a surface contact type three-dimensional gather, but a line contact type three-dimensional gather (not shown) that is not folded outward in the width direction can also be employed. And while the both ends of the front-back direction among the protrusion parts 66 are used as the front-back fixing | fixed part 67 fixed with respect to the side surface of the top sheet 30 in the lying state, the front-back direction intermediate part located between these is not A gathering elastic member 63 extending in the front-rear direction is fixed to the free part 68 in an extended state.

  In the free portion 68 of the three-dimensional gather 60, hot melt adhesives and heat seals and super seals by various coating methods are used to bond the inner layer and the outer layer of the gather sheet 62 and to fix the gather elastic elastic member 63 sandwiched therebetween. At least one of fixing means by material welding such as a sonic seal can be used. Since the flexibility is lost when the entire inner layer and outer layer of the gather sheet 62 are bonded together, it is preferable that the portions other than the bonding portion of the gather elastic elastic member 63 are not bonded or weakly bonded. In the illustrated embodiment, a hot melt adhesive is applied only to the outer peripheral surface of the gather elastic elastic member 63 by an application means such as a comb gun or a sure wrap nozzle, and is sandwiched between the inner layer and the outer layer of the gather sheet 62, thereby collecting the elastic elastic stretch. A structure in which the elongated elastic 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 member 63. It has become.

  Also, hot melt adhesives and heat seals by various application methods are used for fixing the waterproof film 64 and the gather sheet 62 incorporated in the three-dimensional gather 60 and fixing the front and rear fixing portion 67 to the side surface of the interior body 200. Or at least one of means by material welding such as ultrasonic sealing can be used. In the illustrated embodiment, slot application of hot melt adhesive is used for fixing the waterproof film 64. Further, in the illustrated embodiment, the front and rear fixing portion 67 is fixed by combining hot melt adhesive and material welding means, but these can be fixed only by any one of the means.

The gather sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric with excellent uniformity and concealment, and water repellent with silicon as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread 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 fixation 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, a waterproof film 64 can be interposed between the gather sheets folded in two.

  2-6 are preferable and, as for the number of the elongate elastic expansion-contraction members 63 provided in the free part of the three-dimensional gather 60, 3-5 are more preferable. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side.

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

  In the three-dimensional gather 60 thus configured, the contraction force of the elongated elastic elastic member 63 acts so that both ends in the front-rear direction are brought close 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. On the other hand, since they are non-fixed free portions, only the free portions stand up against the body side as shown in FIG. In particular, when the attachment portion 65 is positioned on the back surface side of the interior body 200, the three-dimensional gather 60 stands up so as to open outward in the width direction at the crotch portion and in the vicinity thereof. It comes in contact, and the fit is improved.

  The dimensions of the three-dimensional gather 60 can be determined as appropriate. In the case of an infant paper diaper, for example, as shown in FIG. 7, 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. In addition, the distance W3 between the folds located on the innermost side in a state where 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 preferably 70 to 140 mm.

  Note that, unlike the illustrated embodiment, the three-dimensional gathers can be provided in double (two rows) on the left and right sides of the interior body 200.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

  Although the absorbent body 56 may be rectangular, as shown in FIG. 6, as shown in FIG. 6, the hourglass has a front end portion, a rear end portion, and a narrow portion narrower than the front end portion and the rear end portion. The shape is preferable because the fit of the absorber 56 itself and the three-dimensional gather 60 around the legs is improved.

  Further, the size of the absorbent body can be appropriately determined as long as it extends to the front, rear, left and right of the urination port position, but preferably extends to the peripheral edge of the interior body or the vicinity thereof in the front-rear direction and the width direction. Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles 54, those used for this type of disposable diaper can be used as they are, for example, by sieving (shaking for 5 minutes) using a 500 μm standard sieve (JIS Z8801-1: 2006). The proportion of particles remaining on the top is preferably 30% by weight or less, and the proportion of particles remaining on the screen by sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006) 60% by weight or more is desirable.

  The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent 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 speed is too slow, the liquid supplied into the absorber 56 is likely to cause a so-called reverse return that returns to the outside of the absorber 56.

  Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , the effect is saturated.

  If necessary, the superabsorbent polymer particles can adjust the spraying density or spraying amount in the plane direction of the absorber 56. For example, it is possible to increase the amount of the liquid excretion site more than other sites. When gender differences are taken into account, men can increase the front spray density (amount), while women can increase the center spray density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edge portions protrude from the front and rear of the absorbent body 56, and the overlapping portion and the overlapping portion of the front and rear protruding portions are joined by a joining means such as hot melt adhesive or material welding.

(Exterior body)
As shown in FIGS. 3 to 5, the exterior body 12 is formed by bonding two sheet materials 12 </ b> S and 12 </ b> H together with a joining means such as a hot-melt adhesive or welding. The inner sheet material 12H located on the inner side extends only to the edge of the waist opening WO, but the outer sheet material 12S wraps around the edge on the waist side of the inner sheet material 12H and is folded inside. The folded portion 12r extends so as to cover up to the waist side end of the interior body 200.

The sheet materials 12S and 12H can be used without particular limitation as long as they are in sheet form, but are preferably non-woven fabrics. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured 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 using a nonwoven fabric, the basis weight is preferably about 10 to 30 g / m ² (the total basis weight of the exterior body 12 is about 20 to 60 g / m ² ).

  And in the exterior body 12, in order to improve the fitting property with respect to the trunk periphery, elongated elastic elastic members 15 to 19 such as thread rubber are provided at a predetermined elongation rate between the sheet materials 12S and 12H. As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. For bonding the two sheet materials 12S and 12H of the exterior body 12 and fixing the elongated elastic elastic members 15 to 19 sandwiched between them, a hot melt adhesive by various application methods, heat sealing, ultrasonic sealing, etc. At least one of fixing means by material welding can be used. Since the flexibility is lost when the entire exterior body 12 is firmly fixed, it is preferable that the portions other than the bonding portions of the elongated elastic stretch members 15 to 19 are not bonded or are bonded weakly. In the illustrated embodiment, a hot melt adhesive is applied only to the outer peripheral surfaces of the elongated elastic elastic members 15 to 19 by an application means such as a comb gun or a sure wrap nozzle, and sandwiched between both sheet layers 12S and 12H, thereby forming the elongated shape. With only the hot melt adhesive applied to the outer peripheral surfaces of the elastic elastic members 15 to 19, fixing the elongated elastic elastic members 15 to 19 to both the sheet layers 12S and 12H and fixing between the two sheet layers 12S and 12H It has a structure to do.

More specifically, between the inner side surface of the inner sheet material 12H and the outer surface of the folded portion 12r of the outer sheet material 12S at the waist edge W of the rear body B and the front body F, the entire width direction is continuous. In addition, a plurality of waist edge elastic elastic members 17 are fixed in a state where they are extended along the width direction at a predetermined extension rate at intervals in the vertical direction. In addition, one or a plurality of the waist edge elastic elastic members 17 disposed in the region adjacent to the waist lower part U may overlap with the interior body 200 or may overlap with the interior body 200. You may each provide in the width direction both sides except a direction center part. The waist edge elastic elastic member 17 has 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 , particularly 0.1 to the rubber thread of 1.0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, respectively elongation from 150% to 400%, preferably fixed in particular about 220-320%. Further, the waist edge elastic elastic members 17 need not all have the same thickness and elongation rate. For example, the elastic elastic members may have different thicknesses and elongation rates at the upper and lower portions of the waist edge W. .

  Further, between the outer side surface of the inner sheet material 12H and the inner side surface of the outer sheet material 12S in the lower waist portion U of the front body F and the rear body B, except for the central portion in the width direction overlapping the interior body 200, A plurality of waist lower elastic elastic members 15, 19 made of an elongated elastic elastic member, which are continuous in the entire width direction at each of the upper and both sides in the width direction, are spaced apart in the vertical direction and have a predetermined width. It is fixed in an expanded state along the width direction at an expansion rate.

The waist lower elastic elastic members 15 and 19 have a thickness of 155 to 1880 dtex, especially 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 , particularly 0.1. the rubber thread ~1.0mm about ^2), 1 to 15 mm, particularly 5 to 30 present approximately at intervals of 3 to 8 mm, respectively elongation 200-350%, preferably fixed in particular about 240-300%.

  Further, the width between the outer surface of the inner sheet material 12H and the inner surface of the outer sheet material 12S in the intermediate region L of the front body F and the rear body B, except for the widthwise central portion overlapping the interior body 200, is the width. A plurality of intermediate-region elastic elastic members 16 made of an elongated elastic elastic member are provided in the width direction at a predetermined elongation rate, with a plurality of intermediate elastic elastic members 16 extending in the width direction so as to be continuous over the entire width direction. It is fixed in a stretched state.

The intermediate elastic elastic members 16 and 18 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 , particularly 0.1 to It is preferable to fix the thread rubber of about 1.0 mm ² ) at an interval of 5 to 40 mm, particularly 5 to 20 mm, and about 2 to 10 at an elongation of 150 to 300%, particularly 180 to 260%.

  In addition, as shown in the drawing, the waist lower elastic member 15 and the middle region elastic members 15, 19, 16, 18 are provided on both sides in the width direction except for part or all of the portion overlapping the inner body 200. If this is the case, the interior body 200 will not shrink more than necessary in the width direction, so that it will not look bad or absorb well. In this form, in addition to the form in which the elastic stretchable member exists only on both sides in the width direction, the elastic stretchable member exists from one side of the width direction to the other side across the interior body 200, but overlaps the interior body 200. In part or all 12C, the elastic expansion / contraction member is cut, and the contraction force does not act (substantially equivalent to not providing the elastic expansion / contraction member), and only the both sides in the width direction are the contraction force operation portions. A configured form is also included. Of course, the arrangement of the waist lower elastic elastic members and the middle region elastic elastic members 15, 19, 16, 18 is not limited to the above example, and the elastic force acts on the entire width direction including the portion overlapping the interior body 200. As described above, a part or all of the waist lower elastic member 15 and the middle region elastic members 15, 19, 16, 18 can be provided across the interior body 200 from one side to the other side in the width direction.

  Further, in the illustrated example, the front body F to the back body B are continuously covered by the integrated exterior body 12, but the exterior body includes an abdominal exterior body that covers the abdominal side of the circumference of the wearer's torso and It is divided into a back side exterior body that covers the back side, and the front end of the interior body is connected to the inner surface of the center part in the width direction of the abdominal side exterior body by a hot melt adhesive or the like, and the width direction of the back side exterior body The rear end portion of the interior body is connected to the inner surface of the central portion by a hot melt adhesive or the like, and the abdominal exterior body and the back exterior body are not continuous on the crotch side and are separated from each other. be able to. This separation distance can be about 150 to 250 mm. In this case, on the back surface of the liquid-impermeable sheet in the interior body, the crotch is formed so as to cover the entire back surface of the interior body or to cover the entire portion exposed between the abdominal exterior body and the back exterior body. The exterior body can also be fixed. As the crotch outer body, the same material as that used for the outer body described above can be used.

(Diffusion promotion area)
Characteristically, as shown in FIG. 9 and FIG. 10A, the region including the urination port position 71 and spaced inward from the peripheral edge of the absorber 56 is adjacent to the front and back directions of the absorber 56 and its front side. The application area ratio of the hot-melt adhesive 31, 41, 51 that bonds at least one set of members is a diffusion promoting region 70 that is higher than the surrounding region. That is, the diffusion promoting region 70 of the present invention includes the urination port position 71 and is a region in which the liquid hardly permeates the back side due to the influence of the hot melt adhesives 31, 41, 51 and the liquid easily diffuses in the direction along the surface. For example, it is a region including the urination port position 71 of about 10 to 60% of the area of the absorber. Therefore, in the diffusion promoting region 70, if there is urination due to the higher application area ratio of the hot melt adhesives 31, 41, 51 (ratio of the adhesive application area per unit area) than the surrounding area, As indicated by a white arrow in FIG. 9, in the vicinity of the urination port position 71, it is less likely to permeate the absorber 56 than the surroundings, and as a result, movement (diffusion) to the surroundings is promoted. Therefore, in the present invention, it is only necessary to change the application pattern of the hot melt adhesives 31, 41, 51 that are normally used. The diffusibility can be improved while preventing the amount from decreasing.

  The diffusion promoting area 70 may be appropriately determined depending on the product type and size as long as it includes the urination port position 71 and is spaced inward from the peripheral edge of the absorber 56. The direction dimension can be 20 to 60% of the front-rear direction dimension of the absorber 56, and the width direction dimension of the diffusion promoting region 70 can be 40 to 60% of the width direction dimension of the absorber 56. Since the urination port position 71 differs between men and women, the diffusion promoting area 70 is determined so as to include both the urine port positions 71 of both men and women. 71 may be included. The shape of the diffusion promoting region 70 is rectangular in the illustrated example, but may be an appropriate shape such as an ellipse long in the front-rear direction or an hourglass shape with a narrow crotch width.

  The position in the front-rear direction and the width direction of the diffusion promoting region 70 may be appropriately determined according to the degree of diffusion. In a normal case, the front end of the absorber is 0% and the rear end of the absorber is 100%. In some cases, the front end of the diffusion promoting region is located at 10 to 30%, and the rear end of the diffusion promoting region is located at 55 to 80%.

  When the packaging sheet 58 is formed so as to pass through both sides in the width direction from the back side of the absorbent body 56 to the front side as illustrated, and the end portions are overlapped on the front side of the absorbent body 56, the packaging sheet 58 It is preferable that the overlapping portions 58w of the end portions pass through the diffusion promoting region 70. Since the overlapping part of the packaging sheet 58 has low liquid permeability compared to the non-overlapping part, the diffusibility of the diffusion promoting region 70 can be further improved.

  In the illustrated embodiment, the liquid permeable sheet layer positioned on the front side of the absorbent body 56 corresponds to a portion of the top sheet 30, the intermediate sheet 40, and the packaging sheet 58 that is positioned on the front side of the absorbent body 56. Therefore, as a hot melt adhesive for bonding between at least one pair of members adjacent in the front and back direction, (a) In order to fix the top sheet 30 to a member adjacent to the back side, it is applied to the back surface of the top sheet 30. (B) Intermediate sheet hot melt adhesive 41 applied to the back surface of the intermediate sheet 40 in order to fix the intermediate sheet 40 to a member adjacent to the back side thereof; In order to fix the part located on the surface of the absorber 56 out of 58 to the absorber 56, the packaging sheet hot melt adhesive 51 applied to the inner surface of the packaging sheet 58 corresponds to this.

  In the present invention, at least one application area ratio of the top sheet hot melt adhesive 31, the intermediate sheet hot melt adhesive 41, and the packaging sheet hot melt adhesive 51 is higher in the diffusion promoting region 70 than in the surrounding region. It only has to be done. Therefore, although not shown, all or a plurality of application area ratios of the top sheet hot melt adhesive 31, the intermediate sheet hot melt adhesive 41, and the packaging sheet hot melt adhesive 51 are larger than the surrounding area in the diffusion promoting region 70. Can also be high.

  The hot melt adhesive that forms the diffusion promoting region 70 may have an application area ratio of the hot melt adhesive in the diffusion promoting area 70 higher than the application area ratio of the hot melt adhesive in the surrounding area. It is preferably 100%, particularly 100% (solid coating), and the application area ratio of the hot melt adhesive in the surrounding area is preferably 5 to 60%.

  Regarding the hot melt adhesive forming the diffusion promoting region 70, the application pattern of the hot melt adhesive HM1 in the diffusion promoting region 70 is preferably solid coating (coating in a continuous layer), but it is a dense one that can promote diffusion. If it is a pattern, it can also be made into intermittent patterns, such as a spiral pattern by a summit coating system. When the hot melt adhesive forming the diffusion promoting region 70 is also applied to the region around the diffusion promoting region 70, the application pattern of the hot melt adhesive HM2 in the surrounding region is shown in FIG. As shown in FIG. 10, a dotted pattern in which the dotted application portions are arranged at intervals, and as shown in FIG. 10B, the linear application portions are spaced in the front-rear direction (or width direction). FIG. 11 (b) shows a vertical stripe pattern (or horizontal stripe pattern) arranged, and an annular pattern in which annular application portions surrounding the urination port position 71 are arranged at intervals with each other as shown in FIG. 11 (a). As shown, it can be an intermittent pattern such as a spiral pattern by summit coating or spiral coating.

  The application pattern of the hot melt adhesive HM3 that does not form the diffusion promoting region 70 (for example, the top sheet hot melt adhesive 31 and the packaging sheet hot melt adhesive 51 in the form shown in FIG. 9A) promotes the diffusion promoting region 70. A uniform and intermittent pattern is desirable so as not to affect the operation. Specifically, the application pattern of the hot melt adhesive HM3 that does not form the diffusion promoting region 70 is a dotted pattern in which dotted application parts are arranged at intervals as shown in FIG. As shown in FIG. 12 (b), vertical stripes (or horizontal stripes) in which linear application portions are arranged at intervals in the front-rear direction (or width direction), and urination as shown in FIG. 13 (a). An annular pattern in which annular application portions surrounding the mouth position 71 are arranged in multiple layers at intervals, as shown in FIG. 13B, may be an intermittent pattern such as a summit application or a spiral pattern by a spiral application method. it can.

  Here, as shown in FIG. 9B, when the application area ratio of the top sheet hot melt adhesive 31 is increased in the diffusion promoting region 70, the top sheet hot melt adhesive 31 may come into contact with the skin and adhere thereto. is there. In this case, the diffusibility of urine is improved on the top sheet 30, and depending on the degree, there is a risk of leakage. Moreover, as shown in FIG.9 (c), when the application area rate of the packaging sheet hot-melt-adhesive 51 is increased in the diffusion promotion area | region 70, although contact to skin can be prevented, urine supply to the site | part of the back side immediately May be inhibited, and the amount of absorption may be reduced. On the other hand, as shown in FIG. 9A, when the application area ratio of the intermediate sheet hot melt adhesive 41 is increased in the diffusion promoting region 70, the diffusion mainly in the front, rear, left and right directions in the intermediate sheet 40. Therefore, problems assumed in other forms are less likely to occur.

  However, in order to increase the application area ratio of the intermediate sheet hot melt adhesive 41 in the diffusion promoting region 70, it is necessary that the intermediate sheet 40 is the same as or wider than the diffusion promoting region 70. When the intermediate sheet 40 has the same area as the diffusion promoting region 70, the intermediate sheet hot melt adhesive 41 is necessarily present only in the diffusion promoting region 70 and is not present in the surrounding region. When the intermediate sheet 40 is wider than the diffusion promoting region 70, the intermediate sheet hot melt adhesive 41 is present over the diffusion promoting region 70 and its surrounding region, or the intermediate sheet hot melt adhesive 41 is diffusion promoting. Although it exists only in the area | region 70 and does not exist in the area | region of the circumference | surroundings, any form is included in this invention. In particular, when the intermediate sheet 40 is wider than the diffusion promoting region 70, the portion where the application area ratio of the hot melt adhesive is lower than the diffusion promoting region 70, that is, the liquid is difficult to diffuse in the peripheral side portion of the intermediate sheet 40. Since a portion that is easy to permeate is formed on the back side, the urine diffused in the intermediate sheet 40 is efficiently supplied to the back side.

  As shown in FIG. 9A, in the form having the top sheet hot melt adhesive 31, the intermediate sheet hot melt adhesive 41, and the packaging sheet hot melt adhesive 51, the application area ratio of the intermediate sheet hot melt adhesive 41 In the case of increasing only the diffusion promoting area 70, it is desirable that the application weight of the top sheet hot melt adhesive 31 and the application weight of the packaging sheet hot melt adhesive 51 are lower than the application weight of the intermediate sheet hot melt adhesive 41. . Such a coating basis weight relationship is preferable because diffusion of urine is mainly performed on the intermediate sheet 40 rather than on the top sheet 30, and the urine after diffusion is quickly transferred to the absorber 56.

Specifically, the coating basis weight of the intermediate sheet hot-melt adhesive 41 is preferably set to 5 to 20 g / m ² approximately, the coating basis weight of the topsheet hot melt adhesive 31 be 1 to 3 g / m ² approximately preferably, the package sheet hot-melt adhesive 51 applied basis weight diffusion enhancing region 70 in the 0.5 to 1.5 g / m ^2, and is preferably set to 1 to 5 g / m ² about the other areas. The top sheet hot melt adhesive 31 and the packaging sheet hot melt adhesive 51 are preferably applied intermittently by spiral coating, summit coating, pattern coating, or the like.

<Others>
(A) In the region around the diffusion promoting region 70, if the diffusibility is lowered and the absorption into the absorber 56 is not promoted, there is a risk of leakage. Therefore, it is desirable not to form unevenness on the surface of the topsheet 30 in the diffusion promoting region 70, whereas in the surrounding region, as shown in FIG. 14, many unevennesses 30p and 30d are formed on the surface of the topsheet 30. It is also preferable to form and reduce the diffusibility by this uneven barrier.

  Such irregularities 30p, 30d can be formed by embossing the top sheet 30 or the like. In particular, as shown in FIG. 14, the top sheet 30 has an extruded ridge 30p that is extruded from the back side to the front side. A large number of recesses 30d are arranged in the width direction and in the front-rear direction at intervals, and the recesses 30d between the adjacent extruded ridges are joined to the member on the back side (in this case, the intermediate sheet 40) via the hot melt adhesive 31. The form is preferred.

  (B) As shown in FIGS. 15 and 16, side embossed recesses 80 that bite from the diaper surface to the absorber 56 are formed on both ends in the width direction of the diffusion promoting region 70 or on the outer side in the width direction of the diffusion promoting region 70. It is also a preferred form. Thereby, the cross-sectional shape in the width direction becomes a mountain shape whose thickness decreases as it goes to the side embossed recess 80, and in the diffusion promoting region 70, the diffusibility is improved by the inclination from the urination position toward the side embossed recessed portion 80. On the outer side in the width direction of the region 70, the diffusion toward the outer side in the width direction is suppressed by the inclination toward the side embossed recess 80, so that it becomes difficult to leak while improving the diffusibility. In addition, the top sheet 30, the intermediate sheet 40, and the packaging sheet 58 are firmly attached to the absorbent body 56 by the side embossed concave portions 80, and the movement of urine to the absorbent body 56 is promoted. 40 and the liquid residue in the packaging sheet 58 are reduced, and the performance of keeping the diaper surface in a dry touch (dry touch) can be improved.

  Along with or instead of such side embossed recesses 80, front / rear embossed recesses 81 that bite from the diaper surface to the absorber 56 are formed on both ends of the diffusion promoting region 70 in the front-rear direction or on both sides of the diffusion promoting region 70. You can also. The action is basically the same as that of the side embossed recess 80 except that the direction is different.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
The “front / rear (vertical) direction” means a direction connecting the ventral side (front side) and the back side (rear side), and the “width direction” means a direction (left / right direction) orthogonal to the front / rear direction.

  “Elongation rate” means a value when the natural length is 100%.

  -"Gel strength" is measured as follows. 49.0 g of artificial urine (urea: 20 wt%, salt: 8 wt%, calcium chloride dihydrate: 0.3 wt%, magnesium oxide heptahydrate: 0.8 wt%, pure water: 70.01 wt%), Add 1.0 g of superabsorbent polymer and stir with a stirrer. The produced gel is left in a constant temperature and humidity chamber of 40 ° C. × 60% RH for 3 hours and then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500, manufactured by I.techno Engineering).

  ・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. 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. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. A sample with a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm × 250 mm, ± 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.

- "thickness" is used automatic thickness measuring instrument (KES-G5 Handy Compression measurement program), load: 10 gf / cm ^2, and the pressure area: automatically measured under the conditions of 2 cm ^2.

  -The amount of water absorption is measured according to JIS K7223-1996 "Test method for water absorption of superabsorbent resin".

  ・ The water absorption rate is the “time to end point” when JIS K7224-1996 “Test method for water absorption rate of superabsorbent resin” is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. .

  ・ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard condition (test location is temperature 20 ± 5 ℃, relative humidity 65% or less). .

  The present invention can be used in general disposable diapers such as a tape-type disposable diaper and a pad-type disposable diaper in addition to the pants-type disposable diaper as in the above example.

  L ... Intermediate area, T ... waist area, U ... waist lower part, W ... waist part, 11 ... liquid impervious sheet, 12 ... exterior body, 12A ... side seal part, 12r ... folded part, 30 ... top sheet 31 ... Top sheet hot melt adhesive, 40 ... intermediate sheet, 41 ... intermediate sheet hot melt adhesive, 50 ... absorbing element, 51 ... packaging sheet hot melt adhesive, 56 ... absorber, 58 ... packaging sheet, 60 ... Three-dimensional gather, 62 ... gather sheet, 70 ... diffusion promoting region, 71 ... urination port position, 80 ... side embossed concave part, 81 ... front and rear embossed concave part, 200 ... interior body.

Claims (8)

In a disposable diaper comprising an absorbent body that absorbs and retains excrement over the front, back, left and right of the urination port position, and one or more liquid-permeable sheet layers located on the front side of the absorbent body,
At least one pair of members adjacent to each other in the front and back direction of the absorbent body and the liquid permeable sheet layer is bonded with a hot melt adhesive, includes the urination port position, and is spaced apart from the periphery of the absorbent body. The region was a diffusion promoting region having a higher application area ratio of the hot melt adhesive than the surrounding region,
A disposable diaper characterized by that. As the liquid-permeable sheet layer, a top sheet constituting a diaper surface, a hydrophilic intermediate sheet that is the same as or wider than the diffusion promoting region, and a package sheet that wraps the absorbent body, the absorbent body. The part located on the front side is provided in this order from the front side to the back side,
An intermediate sheet hot melt adhesive that adheres the intermediate sheet to a portion of the packaging sheet located on the front side of the absorber is applied so that the application area ratio is higher in the diffusion promoting region than in the surrounding region. ing,
The disposable diaper according to claim 1.   The disposable diaper according to claim 2, wherein the intermediate sheet is wider than the diffusion promoting region. Top sheet hot melt adhesive for adhering the top sheet to a member adjacent to the back side thereof, and packaging sheet hot melt adhesive for adhering a portion of the packaging sheet located on the front side of the absorber to the surface of the absorber Have
The application basis weight of the top sheet hot melt adhesive and the application basis weight of the packaging sheet hot melt adhesive are lower than the application basis weight of the intermediate sheet hot melt adhesive,
The disposable diaper according to claim 2 or 3. It goes around the front side through the width direction from the back side of the absorber, and comprises a packaging sheet in which the ends are overlapped on the front side of the absorber,
The portion where the end portions of the packaging sheet overlap each other is provided so as to pass through the diffusion promoting region,
The disposable diaper of any one of Claims 1-4.   As the liquid permeable sheet layer, a top sheet constituting a diaper surface is provided. In the diffusion promoting region, the top sheet surface is not uneven, and in the surrounding region, the top sheet surface is formed. The disposable diaper of any one of Claims 1-5 in which many unevenness | corrugations are formed.   The disposable part of any one of Claims 1-6 in which the side part embossing recessed part which cuts in from the diaper surface to an absorber is formed in the width direction both ends of the diffusion promotion area | region, or the width direction outer side of a diffusion promotion area | region, respectively. Diapers.   The application area ratio of the hot melt adhesive in the diffusion promoting region is 90 to 100%, and the application area ratio of the hot melt adhesive in the surrounding region is 5 to 60%. The disposable diaper of Claim 1.

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