JP5008531B2 - Pants-type disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper designed to prevent front-rear leakage.

The pants-type disposable diaper has an absorbent body interposed between the liquid-permeable top sheet and the back sheet, has leg gathers on both sides, and covers from the back side through the crotch part to the abdomen side. In many cases, it has a structure comprising an interior body formed on the exterior body and an exterior sheet attached to the outer surface of the interior body so as to cover the waistline and the crotch portion. In such a structure, the entire back surface of the interior body from the front end to the rear end is adhered to the exterior sheet with a hot melt adhesive. And the both sides on the back side and the both sides on the abdomen side of the exterior sheet are respectively joined, the waist opening and the leg opening are formed in advance, and the body is worn by pulling up the leg opening to the waist around the diaper leg opening. be able to.
In addition, in order to improve the fit to the body, a large number of rubber threads are attached in parallel at intervals in the vertical direction around the waist of the exterior sheet with the rubber thread extended along the width direction. The exterior sheet itself is pressed against the body by the contraction force of the rubber thread, and the interior body attached to the inside of the exterior sheet is also pressed against the body.
JP 2006-263165 A JP 2002-301104 A JP 2004-298395 A JP 2000-26015 A JP 2002-273808 A JP 2004-229857 A

However, in a pants-type disposable diaper having a structure composed of an interior body and an exterior sheet, the front end and the rear end of the interior body are joined to the exterior sheet, so the front end and the rear end of the interior body are not on the body side, but the exterior sheet Warping to the side (outside), resulting in poor fit to the body. As a result, loose stool leaks from between the wearer's back and waist opening, and urine is between the wearer's abdomen and waist opening. Leakage before leaking easily occurred.
Then, the main subject of this invention is to improve the fitting property to the body in the waist side edge part of an interior body effectively by a simple means.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An interior body formed by interposing an absorbent body between the liquid-permeable top sheet and the back surface sheet so as to cover from the back side through the crotch to the abdomen side, and at least front and back on the outer surface of the interior body In a pants-type disposable diaper provided with an exterior sheet that is attached to the waist side end of the outer cover and formed to cover at least the waistline,
While the waist side end of the interior body is bonded to the exterior sheet by the arc-shaped adhesive part at the waist side edge ,
In the interior body adhesion part in the exterior sheet, an elastic elastic member is not provided so as to cross this, or an elastic elastic member is provided, but it is cut so as not to expand and contract,
The waist side elastic elastic member is fixed to the waist side portion of the interior body adhesion portion in the exterior sheet in a state of being stretched along the waistline direction, and both widthwise sides of the interior body adhesion portion in the exterior sheet In this part, a plurality of side elastic elastic members are fixed at intervals in the vertical direction in a state of being stretched along the waistline direction,
The amount of contraction by the waist elastic elastic member is larger than the amount of contraction by the side elastic elastic member, and the amount of contraction of the side elastic elastic member increases from the crotch side toward the waist side. It is configured,
A pants-type disposable diaper characterized by that.

(Function and effect)
Like this invention, while the shape of the adhesion part of the interior body with respect to an exterior sheet | seat is the edge of a waist side being an arc shape , the shrinkage | contraction amount by the waist side elastic elastic member located in the waist side of an interior body adhesion part is the said side part. The side elastic elastic members located on both sides in the width direction of the interior body adhesion portion are configured so that the amount of contraction increases from the crotch side toward the waist side. The waist side elastic stretching member and the side elastic stretching member are pressed against the body on the waist side and both sides in the width direction of the interior body bonding portion, and the shrinkage amount of the exterior sheet increases toward the waist side. The adhesive portion of the inner body is recessed in a boat shape when seen from the inside, and the waist side end portion of the interior body fits well to the body. Therefore, the fit of the waist side end of the interior body can be effectively improved without requiring a large specification change.

In addition, when the edge of the adhesion part is formed in an arc shape in this way, when the adhesion part of the interior body becomes a ship shape, the waist side end portion of the interior body forms an arc shape. Will be even more. In addition, since the outer side of the bulge of the interior body is rounded in appearance, the appearance when the garment is worn on the diaper is improved.

<Invention of Claim 2 >
The pants-type disposable diaper according to claim 1, wherein the end elastic stretchable member is fixed in a state of being stretched along a waist-side edge of the bonded portion.

(Function and effect)
By configuring as described in this section, the aforementioned boat shape is elastically maintained by the contraction force of the end elastic elastic member. Therefore, the fit and followability to the body are improved, and the back leakage and front leakage prevention effects are further enhanced.

<Invention of Claim 3 >
The interior body has an end flap portion that does not have an absorber and is not bonded to the exterior sheet at the front end portion of the waist side end portion, and the end elastic elastic member in the end flap portion The underpants-type disposable diaper according to claim 2, wherein

(Function and effect)
By configuring as described in this section, the end flap of the interior body stands on the body side and forms a barrier for excrement. Therefore, the back leakage and front leakage prevention effects are further improved.

<Invention of Claim 4 >
The pants-type disposable diaper according to any one of claims 1 to 3 , wherein an edge on the waist side of the interior body is formed in a shape along the edge on the waist side of the bonded portion.

(Function and effect)
When configured as described in this section, the non-adhesive portion of the waist side end of the interior body with respect to the exterior sheet does not unnecessarily protrude from the adhesive portion, so that the fit, wearing feeling and appearance are further improved. It becomes.

<Invention of Claim 5 >
A longitudinal elastic stretch member is fixed to both sides of the interior body in the width direction from the crotch side to the waist side end portion in a stretched state in the longitudinal direction, and the longitudinal elastic stretch member is bonded to the interior body. The underpants type disposable diaper of any one of Claims 1-4 extended to the edge of the waist side of a part.

(Function and effect)
As described in this section, the elastic body is provided on both sides in the width direction of the interior body, and the elastic body is also extended to the edge on the waist side of the interior body bonding portion, so that the interior body is The shape can be maintained elastically.

<Invention of Claim 6 >
On both sides in the width direction of the interior body, belt-shaped barrier cuffs standing on the body side are provided from the front end to the rear end of the interior body along the front-rear direction.
Among the front end portion, the rear end portion and the intermediate portion between these barrier cuffs, the front end portion and the rear end portion are fixed to the top sheet in a folded state so as not to stand, and the intermediate portion is The pants-type disposable diaper according to claim 5 , wherein the pants-type disposable diaper is not fixed, and is fixed to at least an intermediate portion of the elongate elastic stretchable member as the front-rear elastic stretchable member extending along the front-rear direction.

(Function and effect)
The invention described in this section uses an elongated elastic expansion / contraction member of a barrier cuff that is widely used, and extends the elastic body to the waist-side edge of the interior body bonding portion, thereby making the interior body the aforementioned ship shape. It maintains its shape elastically.

  As described above, there are advantages that the fit to the body at the waist side end of the interior body can be effectively improved by simple means.

  First, an example of the basic structure of a pants-type disposable paper diaper will be described with reference to FIGS. In each figure, “front-rear direction” means a direction connecting the ventral side (front side) and back side (rear side), “width direction” means a direction (left-right direction) orthogonal to the front-rear direction, “Up and down direction” means the wearing state of the diaper, that is, the direction perpendicular to the waistline direction when the diaper is folded in two at the crotch part so that the both sides of the front body and the back side of the diaper are overlapped, in other words It means the direction connecting the waist opening WO side and the crotch part side.

This pants-type disposable diaper has an abdominal exterior sheet 12F that covers the abdominal side of the wearer's waist and a back exterior sheet 12B that covers the dorsal side, on both side edges in the width direction of the abdominal exterior sheet 12F. The joining portion 12A and the joining portions 12A on both side edges in the width direction of the back exterior sheet 12B are joined by heat sealing, ultrasonic welding, or the like to form the cylindrical waistline portion 100. When the backside exterior sheet 12B extends below the joining portion 12A as in the illustrated embodiment, the backside sheet is subjected to processing such as heat sealing integrally in the vertical range including up to this portion. The extension weld part 12E can be provided in the extension part 14. FIG. By providing the extended welded portion 12E, it is possible to prevent the second elongated elastic elastic member 16 from being pulled in the backside extended portion 14 described later. In this case, considering the ease of breakage of the side portion, the joining portion 12A is generally composed of a collection of small welded portions, and is generally a joining pattern having a low ratio of the welding area in the joining portion 12A. Since it is not necessary to consider the ease of tearing in the welded portion 12E, the second elongated elastic elastic member 16 is surely welded and fixed by increasing the ratio of the welded area of the welded pattern to the welded portion 12A. May be. Further, the extended welded portion 12E can be welded by a curved line at the edge of the collar cover portion 14C, and the second elongated elastic elastic member 16 of the collar cover portion 14C can be prevented from being pulled.
In addition, the front end portion of the interior body 200 is connected to the inner surface of the belly side exterior sheet 12F in the width direction center portion of the waistline portion 100 by a hot melt adhesive or the like, and The rear end portions of 200 are connected by a hot melt adhesive or the like, and the abdominal exterior sheet 12F and the back exterior sheet 12B are not continuous on the crotch side and are separated from each other. This separation distance Y can be about 150 to 250 mm. An abdominal exterior sheet 12F and a back exterior sheet 12B are continuous on the crotch side, and an integral exterior sheet having an hourglass shape as a whole can also be used.

  As can be seen from FIGS. 8 and 9, the upper opening of the waistline portion 100 becomes a waist opening WO through which the wearer's torso passes, and the lower edge of the waistline portion 100 and the interior body 200 on both sides in the width direction of the interior body 200. The portions surrounded by the side edges are leg openings LO through which the legs pass. In a state where each joint 12A is peeled off and developed, an hourglass shape is formed as shown in FIG. The interior body 200 extends from the back side through the crotch part to cover the abdomen side, and is a part that receives the excrement and absorbs and retains the liquid. This is the part that supports the wearer.

(Exterior sheet)
As shown in FIGS. 4 and 5, the abdominal exterior sheet 12 </ b> F and the back exterior sheet 12 </ b> B are formed by laminating two sheets 12, 12 such as nonwoven fabrics, , 12 are provided with elongated elastic expansion / contraction members 15 to 19 such as rubber thread at a predetermined expansion rate. When using a nonwoven fabric, it is preferable that the basic weight shall be about 10-30 g / m < ² >. 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. Further, as the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. Hot melt bonding, heat sealing, or ultrasonic bonding can be used to bond the two sheets 12 and 12 of the exterior sheets 12F and 12B and to fix the elongated elastic elastic members 15 to 19 sandwiched therebetween.
More specifically, the back-side exterior sheet 12B includes a back-side main body portion 13 that occupies the same vertical range as the joint portion 12A, and a back-side extension portion 14 that extends below the back-side main body portion 13. Have. The back extension part 14 has a width direction center part 14 </ b> M overlapping with the interior body 200, and a buttock cover part 14 </ b> C extending on both sides thereof.

The shape of the dorsal extension 14 can be determined as appropriate, but in the illustrated example, the upper end of the dorsal extension 14 has the same width as the dorsal body 13 and extends below the dorsal body 13. The width is narrowed as the lower side approaches the crotch side. A portion having the same width as that of the back-side main body 13 can be omitted. If comprised in this way, the edge 14e of the width direction outer side of the buttock cover part 14C will come in the shape of a straight line or a curve which approaches the interior body 200 side as it approaches the crotch side, and it is easy to cover a buttock part. It becomes a shape.
Although the dimension of the back side extension part 14 can be determined suitably, as shown in FIG. 6, the width direction length 14x of the collar part cover part 14C (the edge 14e on the width direction outer side of the collar part cover part 14C and the inner body 200) More preferably, the maximum distance in the width direction with respect to the side edge is 80 to 160 mm, and the length 14y (extension length) in the vertical direction of the collar cover portion 14C is 30 to 80 mm. Further, assuming that the area of a quadrangle determined by the widest part in the width direction and the widest part in the vertical direction is S, the area of the back side extension part 14 is 20 to 80% of S, In particular, it is preferable that the content is about 40 to 60% because the outer appearance and wearing feeling of the buttocks are excellent.

The back main body 13 can be conceptually divided into a waist part W and a lower part U below it in the vertical direction, and the range varies depending on the size of the product. The length in the vertical direction can be 15-80 mm, and the length in the vertical direction of the lower portion U can be 35-220 mm.
A plurality of back waist elastic elastic members 17 are vertically spaced along the width direction at a predetermined extension rate so as to be continuous over the entire width direction on the waist portion W of the back side main body portion 13. It is fixed in a stretched state. In addition, one or more of the back-side waist elastic elastic members 17 disposed in the region adjacent to the lower portion U of the back-side main body 13 may overlap the interior body 200. Alternatively, it may be provided on both sides in the width direction except for the central portion in the width direction that overlaps the interior body 200. The back waist elastic elastic member 17 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex of rubber thread at an interval of 4 to 12 mm, and an expansion ratio of 150 to 400%, particularly 220 to It is preferable to fix at about 320%.
Further, in the lower portion U of the back-side main body 13, except for the central portion in the width direction that overlaps with the interior body 200, the entire width direction of each portion is continuous with each portion on the upper side and both sides in the width direction. The plurality of first elongated elastic elastic members 15 are fixed in a state where they are extended along the width direction at a predetermined extension rate at intervals in the vertical direction.

  As the first elongated elastic elastic member 15, a rubber thread having a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex, about 1 to 15 mm, particularly about 5 to 30 at intervals of 3 to 8 mm, and an elongation ratio of 200 to It is preferable to fix at 350%, particularly about 240 to 300%.

  Moreover, in the back side extension part 14, except the center part of the width direction which overlaps the interior body 200, it continues to each site | part of the width direction both sides over the whole width direction of each site | part (at least over the whole collar cover part 14C). As described above, the plurality of second elongated elastic elastic members 16 are fixed in a state of being spaced apart in the vertical direction and stretched along the width direction at a predetermined stretch rate.

  As the second elongated elastic elastic member 16, a rubber thread having a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex, about 2 to 10 at an interval of 5 to 40 mm, particularly 5 to 20 mm, and an elongation ratio of 150 to It is preferable to fix at 300%, particularly 180 to 260%.

On the other hand, the abdominal exterior sheet 12F is composed of only the abdominal body part basically the same as the back body part 13 of the back exterior sheet 12B (the part occupying the same vertical range as the joint part 12A). It has a rectangular shape extending along the direction, and does not have the back side extension portion 14 like the back side exterior sheet 12B.
That is, among the waist part W and the lower part U of the abdominal exterior sheet (abdominal body part) 12F, the plurality of abdominal waist elastic elastic members 18 are connected to the waist part W over the entire width direction. Are fixed in a state where they are stretched along the width direction at a predetermined stretch rate with an interval in the vertical direction. The ventral waist elastic elastic member 18 is preferably as close as possible in number, thickness, stretch rate, spacing, and vertical arrangement with respect to the back waist elastic elastic member 17, but may be different. When differentiating, the difference in number is 10 or less, preferably 5 or less, the difference in thickness is 1880 dtex or less, preferably 470 dtex or less, the difference in elongation is 100% or less, preferably 40% or less, the difference in spacing Is 10 mm or less, preferably 5 mm or less.

Further, in the lower portion U of the abdominal exterior sheet 12F (abdominal body portion), the width direction of each region is provided on each of the upper side and both sides in the width direction, except for the central portion in the width direction that overlaps the interior body 200. A plurality of third elongate elastic elastic members 19 are fixed in a state where they are extended in the width direction at a predetermined extension rate at intervals in the vertical direction so as to be continuous throughout. Although the vertical disposition range of the third elongated elastic elastic member 19 may be a part of the lower portion, it is preferable that the third elongated elastic elastic member 19 is substantially the whole (a range in which the expansion / contraction force acts on the whole).
The third elongated elastic elastic member 19 is preferably as close as possible to the first elongated elastic elastic member 15 in terms of number, thickness, stretch rate, spacing, and vertical arrangement, but may be different. When differentiating, the difference in number is 10 or less, preferably 5 or less, the difference in thickness is 1880 dtex or less, preferably 470 dtex or less, the difference in elongation is 100% or less, preferably 40% or less, the difference in spacing Is 10 mm or less, preferably 5 mm or less.

  The abdominal exterior sheet 12F in the illustrated form is composed of only a portion that occupies the same vertical range as the joint portion 12A, but, similarly to the back side, a ventral main body portion that occupies the same vertical range as the joint portion 12A; In addition, a configuration including an abdominal-side extension portion extending below the abdominal-side main body portion may be employed. Thereby, the leg periphery shape of the abdominal exterior sheet | seat 12F can be made into the shape fitted along a buttock. In this case, the area of the ventral extension part is preferably 10 to 80% of the area of the dorsal extension part, and more preferably 20 to 50%. If the ventral extension is excessively large, the fit is rather impaired, which is not preferable.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the basic form shown in FIGS. As shown in FIG. 3, the inner body 200 includes a surface sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. On the back side of the liquid-impermeable sheet 11, a crotch portion is provided so as to cover the entire back surface of the interior body 200 or to cover the entire portion exposed between the abdominal exterior sheet 12F and the back exterior sheet 12B. The exterior sheet 12M can also be fixed. In addition, an intermediate sheet (second sheet) 40 can be 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. Furthermore, in order to prevent excrement from leaking on both sides of the absorption part 20, barrier cuffs 60 and 61 standing on the body side can be provided on both sides of the interior body 200. Although not shown, the constituent members of the interior body 200 can be appropriately fixed to each other by solid, bead or spiral application such as hot melt adhesive.

  In addition, in the width direction both sides of the interior body 200, particularly in the vicinity of the intersection point between the width direction both side edges of the interior body 200 and the lower end edge of the ventral side exterior sheet 12F and in the vicinity of the intersection point between the lower end edge of the back side exterior sheet 12B. The rigidity (rigidity) of 15 to 50 cN / 50 mm, particularly 20 to 35 cN / 50 mm, is preferable because the overall standing shape of the barrier cuffs 60 and 61 as described later is further stabilized. On the other hand, for other portions, for example, the intermediate portion in the width direction, considering the flexibility, it is preferable to reduce the rigidity to 5 to 35 cN / 50 mm, preferably 10 to 25 cN / 50 mm. In addition, the range which makes rigidity high is the range of 5-30 mm to the center side from the width direction both-sides edge of the interior body 200 in the width direction, and the interior body 200, the abdominal side exterior sheet | seat 12F, and the back side exterior sheet | seat 12B in the front-back direction. It is preferable that the distance is within 50 mm in the front-rear direction from the intersection (not including the portion overlapping with the constricted portion 56N of the absorber 56).

  Stiffness (rigidity) is measured by the following method in accordance with JIS K 7171 (Plastic-Flexural rigidity test method). For the measurement, a tensilon tester (curvature radius R1 = 5.0 ± 0.1 mm at the tip of the indenter, radius of curvature R2 = 5.0 ± 0.2 mm at the tip of the support plate) was used, and the product 200 of the interior body 200 in the longitudinal direction. Measure the bending stiffness. The test piece is prepared by removing the elastic elastic member that affects the measurement from the inner body 200 and cutting it into a rectangle having a diaper longitudinal direction of 80 mm and a diaper width direction of 50 mm. 50 mm in the unit of the flexural rigidity value is the length of the short side of the test piece, and is the width of the test piece bent with the indenter at the time of the test. On the pair of support plates each having a tip portion having an arcuate cross-section, the interval between the tips (upper ends) of both tip portions being 50 mm, arranged in parallel with each other and the height positions of both tip portions being aligned, The test piece is placed so that its longitudinal direction is directed in a direction perpendicular to each plate, and the tip of the indenter is arranged so as to slightly touch the test piece. A load-deflection curve is obtained by lowering the indenter under conditions of a load cell of 5 kg (range 196 cN) and a speed of 30 mm / min. Let the maximum value of the obtained bending stress be a bending rigidity value (cN / 50 mm). In addition, when the site | part used as a measuring object is smaller than the said sampling dimension, it measures with a small scale test piece, and converts it by proportional calculation based on a dimension ratio.

(Surface sheet)
The top sheet 30 has a property of transmitting liquid, 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. .

  Further, the top sheet 30 may be composed of one sheet or may be composed of 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.

  When the barrier cuffs 60 and 61 are provided, both side portions of the surface sheet 30 pass between the liquid-impermeable sheet 11 and the barrier cuffs 60 and 61 to the back side of the absorbent element 50 to prevent liquid penetration. Therefore, it is preferable to adhere to the liquid-impermeable sheet 11 and the barrier cuffs 60 and 61 with a hot melt adhesive or the like. Thereby, the effect that the rigidity of the both sides of the interior body 200 is improved is also obtained.

(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 to quickly transfer the liquid that has passed through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance of 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 material 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 2.2 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. When the intermediate sheet 40 goes from the width direction side portion to the back surface side of the absorber 56 and is bonded and fixed with a hot melt adhesive or the like, the rigidity of both side portions of the interior body 200 is improved.

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, the liquid-impermeable sheet 11 is substantially made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet, or a waterproof film. Non-woven fabrics that ensure liquid impermeability (in this case, a liquid-impermeable sheet is composed of a waterproof film and a non-woven fabric). Of course, in addition to this, materials having liquid impermeability and moisture permeability, which have been used and used in recent years from the viewpoint of preventing stuffiness, can also be exemplified. As the sheet of the material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction. Examples of the microporous sheet obtained in this way can be given. In addition, non-woven fabric using micro-denier fiber, strengthening leak-proofing by reducing the voids of the fiber by applying heat or pressure, and applying water-absorbing resin or hydrophobic resin or water repellent. A sheet that is liquid-impermeable without using a film can also be used as the liquid-impermeable sheet 11.
The liquid-impermeable sheet 11 is preferably extended around both sides of the absorbent element 50 to both sides of the side surface 30 of the absorbent element 50 in order to improve leakage prevention. Thereby, the effect that the rigidity of the both sides of the interior body 200 is improved is also obtained. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

  Further, the inner surface or the outer surface of the liquid-impermeable sheet 11 may be designed by printing or coloring. Further, an excretion indicator 80 whose color changes due to absorption of the liquid component can be provided inside the liquid-impermeable sheet 11.

(Barrier cuffs)
The barrier cuffs 60 and 61 are belt-like members extending along the both sides of the interior body 200 over the entire front-rear direction, blocking urine and soft stool that travel along the top sheet 30 in the lateral direction and prevent side leakage. It is provided to prevent this.
In this embodiment, as shown also in FIGS. 4 and 5, barrier cuffs 60 and 61 are provided double on the left and right sides of the interior body 200. In the state where the diaper is unfolded, as shown in the figure, the inner barrier cuff 61 stands obliquely from the side of the interior body 200 toward the center in the width direction, and the outer barrier cuff 60 is in the width direction of the inner barrier cuff 61. The outer side portion is provided so as to stand upright from the side of the interior body 200, the base side portion stands obliquely toward the center in the width direction, and the tip side portion from the intermediate portion stands obliquely outward in the width direction. To do.
More specifically, the inner barrier cuff 61 folds the belt-like barrier 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. Between them, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. The elongated elastic elastic member 63 is not fixed to the barrier sheet 62 at the front and rear ends, and is fixed so that the barrier cuff extends and contracts in the middle part. The barrier sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), an 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 420 to 1120 dtex, and more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. Although not shown, a waterproof film can be interposed between the barrier sheets folded in two.

  It is preferable to arrange one or two elongated elastic expansion / contraction members 63 at the distal end portion of the inner barrier cuff 61, and it is even more preferable that one or two elongated elastic expansion / contraction members 63 be disposed at an intermediate portion between the distal end portion and the proximal end portion. When the elongated elastic elastic member 63 is present in the intermediate portion, it becomes easy to hit the skin against the surface in the range from the intermediate portion to the distal end portion using this as a fulcrum. The arrangement position of the elongated elastic elastic member 63 in the middle portion is preferably in the range of 30 to 70% of the height of the inner barrier cuff 61 (length in the width direction of the protruding portion). In an infant paper diaper, the height of the inner barrier cuff 61 is preferably about 15 to 35 mm. Therefore, the arrangement range of the elongated elastic stretchable member 63 is preferably 5 to 25 mm from the distal end to the proximal end, and is 12 to 18 mm. Is more preferable. When the elongated elastic elastic members 63 are provided in parallel at the front end portion and / or the intermediate portion of the inner barrier cuff 61, the arrangement interval 61d is preferably 2 to 10 mm, and more preferably 2 to 6 mm.

  The end of the inner barrier cuff 61 opposite to the folded portion in the width direction is an attachment portion (inner attachment portion) 65 fixed to the back surface of the side edge of the interior body 200. The portion is a protruding portion 66 (a portion on the folded portion side and corresponding to the inner protruding portion) protruding from the mounting portion 65, and both ends in the front-rear direction of the protruding portion 66 are hot melt adhesive on the surface of the surface sheet 30. Or a heat-sealing front and rear fixing portion 67, and a middle portion in the front-rear direction is an unfixed free portion (inner free portion), and an elongated elastic elastic member 63 along the front-rear direction is fixed to the free portion in an extended state. ing.

The outer barrier cuff 60 also has basically the same structure as the inner barrier cuff 61, but its attachment portion (outer attachment portion) 68 is an attachment portion 65 of the inner barrier cuff 61 on the back side of the interior body 200. Further, both ends in the front-rear direction of the projecting portion (outer projecting portion) 69 pass from the mounting portion 68 to the side of the interior body 200, and are fixed to the outer surface of the inner barrier cuff 61 on the center side in the width direction. 61, a base side portion that extends to the surfaces of both end portions in the front-rear direction of the inner projecting portion 66 and is fixed to the surfaces of both end portions in the front-rear direction of the inner projecting portion 66, and is folded back outward in the width direction from the tip of the base side portion. In addition, the point differs from the front end side portion fixed to the base side portion, the arrangement and number of the elongated elastic elastic members 63, and the like.
However, the inner barrier cuff 61 also has a structure in which the tip of the inner protruding portion is folded outward in the width direction, specifically, not more than 1/2 of the height of the inner barrier cuff 61 (width direction length of the protruding portion), If it is preferably 1/3 or less, a structure in which the tip side portion is folded back in the width direction and fixed to the base portion side portion similarly to the outer barrier cuff 61 may be adopted.

  The number of the elongated elastic elastic members 63 provided in the free part (outer free part) of the outer barrier cuff 60 is preferably 2-6, and more preferably 3-5. 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 thickness and elongation rate of the elongated elastic elastic member 63 disposed on the outer barrier cuff 60 are similar to those of the inner barrier cuff 61, but the thickness is the same as or greater than that of the inner barrier cuff 61, and the elongation rate is the inner barrier cuff. The same or lower than that of 61 is preferred.

  In addition, the longitudinal length of the front-rear fixing portion 67 of the protruding portions 66, 69 is preferably formed so that the inner barrier cuff 61 is the same as or shorter than the outer barrier cuff 60, and the elongated elastic cuffs 60, 61 are elongated elastic. The length of the stretchable member 63 fixed in the front-rear direction is preferably such that the inner barrier cuff 61 is the same as or longer than the outer barrier cuff 60. The boundary between the attachment portion 65 and the protruding portion 66 may be the same position on the outer barrier cuff 60 and the inner barrier cuff 61, but the boundary of the outer barrier cuff 60 is the center in the width direction than the boundary of the inner barrier cuff 61. It is preferable to be spaced apart to the side, and the distance is preferably within 10 mm.

It is preferable to form a linear root fixing part by hot melt adhesive or heat sealing at the edge part on the protruding parts 66, 69 side of the attaching parts 68, 65 of the outer barrier cuff 60 and the inner barrier cuff 61. The other fixing parts can be fixed in an appropriate pattern using a hot melt adhesive or the like. This linear root fixing portion is located in the vicinity of the side portion on the front surface side of the interior body 200 (specifically, the position from 0 to 5 mm in the width direction from the side edge, preferably 0 to 3 mm) or the back surface side. preferable. In this case, since the barrier cuff is folded and fixed to the surface side substantially only at both ends in the front-rear direction, in the crotch part where the restriction to the center in the width direction by the front-rear fixing part 67 does not sufficiently act. The outer barrier cuff 60 and the inner barrier cuff 61 both stand up outward in the width direction, and the pocket formed by the inner barrier cuff 61 becomes wider. When the linear root fixing part is positioned over 5 mm in the width direction from the side edge on the surface side, the barrier cuff rises toward the center in the width direction also in the crotch part, and the pocket formed by the inner barrier cuff 61 is narrow Therefore, it is not preferable. When located on the back surface side, a position of 0 to 20 mm from the side edge of the interior body 200 is appropriate, but may be located beyond 20 mm.
The fixing target of the attachment portions 68 and 65 of the outer and inner barrier cuffs 60 and 61 can be an appropriate member such as the surface sheet 30, the liquid-impermeable sheet 11, and the absorbent element 50 in the interior body 200. The other barrier cuff can be fixed to the interior body 200 via the one barrier cuff.

  In the outer and inner barrier cuffs 60 and 61 configured in this way, the contraction force of the elongated elastic elastic member 63 acts so as to bring the both ends in the front-rear direction closer, but the both ends in the front-rear direction among the protruding parts 66 and 69 do not stand up. However, only the free part stands up so as to come into contact with the body side as shown in FIG. 3. In particular, when the attachment portions 68 and 65 are located on the back side of the interior body 200, the outer and inner barrier cuffs 60 and 61 stand up so as to open outward in the width direction at the crotch portion and the vicinity thereof. The barrier cuffs 60, 61 come into contact with the legs around the surface, and the fit is improved. On the other hand, on both the front and rear sides (abdomen and back) of the crotch part, the inner and rear barrier cuffs 61 are restricted by the front and rear fixing part 67 so that the outer and inner barrier cuffs 60 and 61 do not open outward in the width direction. In addition, since the lower half of the outer barrier cuff 60 is also erected in the same manner, it is possible to surely prevent the abdomen and the back from leaking from both sides of the interior body 200. Further, the front and rear fixing portions 67 of the protruding portion 66 of the inner barrier cuff 61 are not folded back, and the front and rear fixing portions 67 of the protruding portion 68 of the outer barrier cuff 60 are folded outward. , 61 is maintained between the inner and outer free parts, and the outer and inner barrier cuffs 60, 61 are securely raised at a wide interval, and each fits around the leg, providing excellent leakage prevention. It will be.

Although the dimensions of the barrier cuffs 60 and 61 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 inner barrier cuff 61 (the length in the width direction of the protruding portion 66 in the unfolded state). ) W5 is 10 to 50 mm, preferably 15 to 35 mm. Standing height of the outer barrier cuff 60 (width direction length of the protruding portion 69 in the unfolded state) W6 is 15 to 60 mm, particularly 20 to 40 mm. Is preferred. Further, the separation distance W4 between the tips in a state where the inner barrier cuff 61 is tilted to the surface of the top sheet 30 is preferably 60 to 170 mm, particularly 70 to 120 mm. Further, it is preferable that the separation distance W3 between the innermost folds when the outer barrier cuff 60 is flatly folded so as to be parallel to the surface of the top sheet 30 is 60 to 190 mm, particularly 70 to 140 mm.
Unlike the illustrated embodiment, only one of the outer and inner barrier cuffs 60 and 61 can be provided.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a covering sheet 58 that wraps at least the back and side surfaces of the absorbent body 56. The covering 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.

The absorber 56 may be rectangular, but as shown in FIG. 6, the front end portion 56F, the rear end portion 56B, and a constricted portion having a narrower width than those of the front end portion 56F and the rear end portion 56B. It is preferable to form an hourglass shape having 56N because the fit of the absorber 56 itself and the barrier cuffs 60, 61 around the legs is improved. As specific dimensions, the length in the front-rear direction of the absorber front end portion 56F is L1, the length in the front-rear direction at the overlapping portion between the absorber 56 and the ventral exterior sheet 12F is L2, and the length of the front and rear ends of the absorber rear end portion 56B. The length in the direction is L3, the length in the front-rear direction at the overlapping portion between the absorber 56 and the back exterior sheet 12B is L4, the minimum width of the constricted portion 56N is W1, the width of the absorber front end portion 56F and the rear of the absorber When the width of the end portion 56B is W2, it is preferable that the end portion 56B is configured to satisfy the following expressions (1) to (4).
70 mm ≦ W1 <W2 ≦ 190 mm (1)
0.5 ≦ W1 / W2 ≦ 0.85 (2)
0 mm ≦ L1-L2 ≦ 70 mm (3)
0mm ≦ L3-L4 ≦ 50mm (4)

If W1 and W2 are too narrow, the standing of the barrier cuffs 60 and 61 becomes unstable, and the amount of absorption becomes insufficient. If it is too wide, the fit feeling deteriorates due to a decrease in fit.
In addition, when the value is within the above numerical range, the absorber 56 does not exist in the vicinity of the attachment portion 65 of the barrier cuff 60, 61 in the crotch portion. Therefore, the degree of freedom of movement of the barrier cuff 60, 61 increases, and the barrier cuff 60, 61 Is easy to open outward in the width direction, and it is easy to hit the skin with the surface, and the followability of the fit surface to the movement of the leg is improved. Since the absorber 56 on the side of the interior body 200 exists in a sufficient range on both the front and rear sides, the standing of the barrier cuffs 60 and 61 is stabilized with this as a base point (fulcrum). A portion extending from the front and rear sides to the crotch portion is a displacement portion in which the barrier cuffs 60 and 61 are opened outward in the width direction from a posture in which the barrier cuffs 60 and 61 are erected on the inner side in the width direction with reference to both side edges in the width direction. The posture change of 60, 61 is supported by the absorber 56 that exists up to the side of the interior body 200, and the overall standing shape of the barrier cuffs 60, 61 is stabilized. If the constricted part is too large outside the above numerical range, the degree of freedom of the barrier cuffs 60 and 61 becomes too high in the crotch part, and there is a possibility that a gap is easily formed around the leg, and both the front and rear sides of the crotch part However, since there is no base point (fulcrum), the standing of the barrier cuffs 60 and 61 may become unstable. Conversely, if the constricted portion becomes too small, the degree of freedom of the barrier cuffs 60 and 61 is lowered, which is not preferable.
Furthermore, the front-rear direction length L7 of the entire constricted portion 56N is preferably 80 mm or more, and particularly preferably 120 to 260 mm. If the length L7 in the front-rear direction of the constricted portion 56N is too short, the degree of freedom of the barrier cuffs 60 and 61 is lowered, and the fit of the absorbent body 56 around the legs is lowered to prevent the movement of the legs, which is too long. And the standing of the barrier cuffs 60 and 61 becomes unstable.

(Superabsorbent polymer particles)
Superabsorbent polymer particles include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are 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, one integrated with an antibacterial substance can be used. In particular, zeolite particles obtained by substituting some or all of the ion-exchangeable ions in the zeolite with silver ions (hereinafter referred to as antibacterial deodorant zeolite) are contained in the superabsorbent polymer or antibacterial. Antibacterial deodorant superabsorbent polymer particles obtained by adhering deodorant zeolite particles to the surface of superabsorbent polymer particles by static electricity are suitable.

As the superabsorbent polymer particles, those having a water absorption rate of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, 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 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 application amount of the liquid excretion site as compared to 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.

(Enveloping sheet)
When the covering 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 instead of the crepe paper, a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene, etc. can be used as the material. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  As shown in FIG. 3, the covering sheet 58 may cover only the back surface and the side surface of the layer in addition to the form for covering the entire absorber 56. Although not shown, only the upper and side surfaces of the absorbent body 56 are covered with crepe paper or a nonwoven fabric, and the lower surface is covered with a liquid-impermeable sheet such as polyethylene, and the upper surface of the absorbent body 56 is covered with crepe paper or a nonwoven fabric. For example, the lower surface may be covered with a liquid-impermeable sheet such as polyethylene (each of these materials becomes a component of the covering sheet). If necessary, the absorbent body 56 may be sandwiched between two upper and lower sheets or disposed only on the lower surface, but this is not desirable because it is difficult to prevent the movement of the superabsorbent polymer particles.

(Crotch exterior sheet)
A crotch outer sheet 12M exposed on the outer surface of the product is provided on the back side of the inner body 200. As the material of the crotch outer sheet 12M, the same material as the abdominal outer sheet 12F and the back outer sheet 12B can be used, but a material containing a higher-strength material or a deodorant, etc. A material different from the exterior sheet 12F and the back-side exterior sheet 12B may be used. Specifically, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a pointbonded nonwoven fabric, an air-through nonwoven fabric, an air point nonwoven fabric, a spunlace nonwoven fabric, an SMS nonwoven fabric, or the like, each made of fibers such as PP, PP / PE, PP / PET, or the like, or What added the deodorizer etc. to this can be used.

A high body pressure is applied to the crotch outer sheet 12M when sitting. Therefore, a material having a high friction fastness (not fuzzy) is preferable.
The crotch outer sheet 12M may be a sheet provided with design elements by printing or coloring. Further, a printed or colored design sheet, which is a member different from the crotch outer sheet 12M, is attached to the outside of the liquid impermeable sheet 11 (for example, between the liquid impermeable sheet 11 and the crotch outer sheet 12M). May be attached. When the crotch outer sheet 12M provided with design elements and the design sheet are used in combination, it is preferable to arrange them so that the designs do not overlap.

It is preferable to use a stretchable nonwoven fabric as the crotch outer sheet 12M and to extend and paste in the longitudinal direction of the inner body 200 because the fit of the crotch part is improved.
When the crotch outer sheet 12M goes from the side in the width direction to the side of the body and is bonded and fixed to the outer surface of the barrier sheet 62 with a hot melt adhesive or the like, the rigidity of both sides of the inner body 200 is improved. In such a form, it is preferable to use a sheet having high rigidity (roughness) as the crotch outer sheet 12M. Specifically, a sheet having a bending resistance measured by the Clark method (JISL1096 C method) and a sum of the MD direction and the CD direction of the sheet of 100 mm or more, preferably 150 mm or more may be used.

  In the illustrated example, the crotch outer sheet 12M is sandwiched between the inner body 200 and the abdominal and dorsal exterior sheets 12F and 12B where the abdomen and dorsal exterior sheets 12F and 12B overlap the interior body 200. However, it is also possible to affix them to the outside of the ventral and backside exterior sheets 12F and 12B. The crotch outer sheet 12M is affixed to the back surface of the inner body 200 and the inner or outer surfaces of the abdominal and back-side outer sheets 12F and 12B with a hot melt adhesive or the like.

<Characteristics of the present invention>
Characteristically, as shown in FIG. 10, the shape of the bonding portion 201 with respect to the abdominal and back side exterior sheets 12F and 12B at the front end portion and the rear end portion of the interior body 200 is wide from the crotch side toward the waist side. It has a shape that swells while narrowing. In the present invention, the shape of the bonding portion 201 is a shape in which the edge on the waist side forms an arc shape, such as a semicircular shape or a mountain shape shown in the figure. In particular, as shown in FIG. 12, it is preferable to form the above-described bulging shape by stacking the interior body bonding portions 201 in a stepped shape in a plurality of rectangular ranges, because it becomes easy to apply the adhesive in manufacturing.
Moreover, in the part of the width direction both sides of the interior body adhesion part 201 in the abdominal side and the back side exterior sheets 12F and 12B, the width direction both ends of the exterior sheets 12F and 12B from both side edges or the vicinity thereof. The first to third elastic elastic members 15, 16, and 19 are fixed with a space in the vertical direction while being stretched along the waistline direction (hereinafter also referred to as side elastic elastic members). In the interior body adhesive portion 201, the first to third elastic elastic members 15 provided so as to cross the interior body adhesive portion 201 continuously with the elastic elastic members on both sides in the width direction of the interior body adhesive portion 201, 16 and 19 are cut so that the contraction force does not act. As this cutting method, a known method (for example, Patent Documents 4, 5, and 6) can be employed. Of course, it is also possible to adopt a structure in which the elastic elastic member itself is not provided without cutting in the corresponding range.

On the other hand, the elastic elastic members located on the waist side portions of the interior body bonding portions 201 in the abdominal and back exterior sheets 12F and 12B, that is, the waist elastic elastic members 17 and 18 and the first elastic elastic member 15 in the illustrated embodiment. , And the third elastic elastic member 19 (hereinafter also referred to as a waist elastic elastic member) are fixed in a state of being stretched along the width direction over the entire waist direction of each part without being cut.
Further, the amount of contraction by the waist elastic elastic members 17, 18, 15, 19 on the waist side of the interior body adhesive portion 201 is reduced by the side elastic elastic members 15, 16, 19 on both sides in the width direction of the interior body adhesive portion 201. It is larger than the amount, and the side elastic elastic members 15, 16, 19 are configured such that the amount of contraction increases from the crotch side toward the waist side. The amount of shrinkage is adjusted by the length of the waistline direction (width direction) of the stretchable part (the part where the elastic stretchable member is fixed in the stretched state), the thickness of the elastic stretchable member, and the stretch rate when the elastic stretchable member is fixed. can do. For example, in the illustrated embodiment, when the waist side elastic elastic members 17, 18, 15, 19 and the side elastic elastic members 15, 16, 19 are compared, the length of the former elastic part is longer. large. And the amount of contraction can be made larger by making the former thickness and the expansion ratio at the time of fixation more than the latter. In addition, as shown in FIGS. 2, 8, and 9, when the individual side elastic elastic members 15, 16, and 19 are compared, depending on the shape of the interior body bonding portion 201, as it goes to the waist side. Since the length of the expansion / contraction part becomes longer, even if the thickness and the expansion ratio at the time of fixation are the same, the amount of contraction can be further increased toward the waist side.

  In the disposable diaper thus configured, the waist-side elastic stretch members 17, 18, 15 and the side elastic stretch members 15, 16, 19 are pressed against the body on the waist side and both sides in the width direction of the interior body bonding portion 201. In addition, since the shrinkage amount of the exterior sheets 12F and 12B increases toward the waist, the adhesive portion 201 of the interior body 200 is recessed in a boat shape when viewed from the inside, and the waist side end of the interior body 200 fits well to the body. To come. In particular, when the edge on the waist side of the interior body adhesive portion 201 is formed in an arc shape, when the adhesive portion 201 of the interior body 200 becomes a ship shape, the end on the waist side of the interior body 200 forms an arc shape. The fit and the feeling of wearing are further improved. In addition, since the outer side edge of the bulge of the interior body 200 is rounded in appearance, the appearance when the garment is worn on the diaper is improved.

  In order to further enhance the effect of deforming the interior body 200 into a boat shape, an end elastic elastic member 202 such as rubber thread is fixed in an expanded state along the waist-side edge of the interior body bonding portion 201. Preferred. In this case, the aforementioned boat shape is elastically maintained by the contraction force of the end elastic expansion / contraction member 202, the fit / following performance to the body is improved, and the back leakage and front leakage prevention effects are further improved. Will be.

  As the end elastic elastic member 202, a known elastic elastic member such as a rubber thread can be used similarly to the other elastic elastic members. When the rubber thread is used, the thickness is about 470 to 1240 dtex, particularly about 470 to 940 dtex. It is preferable to fix the thread rubber at one or about 2 to 5 at intervals of 4 to 12 mm and an elongation of 150 to 300%, particularly about 180 to 230%. The end elastic member 202 is preferably provided continuously from one end to the other end in the width direction of the interior body 200.

In the illustrated embodiment, the crotch outer sheet 12M is folded back onto the top sheet 30 at the edge on the waist, and the folded portion is joined to the top sheet 30 with a hot melt adhesive or the like, and the end elastic between the folded portion sheets is provided. Although the elastic member 202 is sandwiched and fixed, the present invention is not limited to this. For example, the crotch exterior sheet 12M is not extended, and the top sheet 30 and the liquid impermeability are not formed at the distal end of the waist end of the interior body 200. The adhesive sheet 11 can be bonded together, and the end elastic elastic member 202 can be sandwiched and fixed between both sheets.
In the case of providing such an end elastic elastic member, as shown in the illustrated example, the front end portion of the waist side end portion of the interior body 200 does not have the absorber 56 and is bonded to the exterior sheets 12F and 12B. It is preferable to secure an end flap portion 203 that does not exist and to provide an end elastic elastic member 202 in the end flap portion 203. As a result, the end flap 203 of the interior body 200 stands on the body side as shown by a two-dot chain line in FIG. 11, and forms an excrement blocking wall. Further, the end flap 203 is formed with a non-adhesive portion (free portion) having a shape corresponding to the adhesive portion 201 having a shape that swells while narrowing from the crotch side toward the waist side. Stands up in a curve along the shape of the buttocks and abdomen. Therefore, the back leakage and front leakage prevention effects are further improved.

  Further, the basic part of the interior body 200 continuously supplies the sheet body that is the basis of the top sheet 30 and the liquid-permeable sheet 11 so that the front-rear direction of the diaper is the flow direction of the line, and these are laminated. In joining, the absorbent element 50, the intermediate sheet 40, etc. are inserted intermittently, and the continuous laminate is cut individually. For this reason, although it is easy to manufacture if the shape of the interior body 200 is a rectangle, the non-adhesive portion of the substantially triangular shape at the end on the waist side of the interior body 200 with respect to the exterior sheets 12F and 12B is unpleasantly eaten from the adhesive portion 201. Ooze out. Therefore, as shown in FIG. 15, it is one preferable form that the edge on the waist side of the interior body 200 is formed in a bulging shape along the edge on the waist side of the bonded portion 201. In this case, it is preferable to form the members (top sheet 30, liquid impervious sheet 11, absorbent element 50, etc.) extending to the waist side edge among the members constituting the interior body 200 in the same shape. . Moreover, it is preferable to arrange | position the edge part elastic elastic member 202 also in the curve form so that the bulging shape of the interior body 200 edge part may be met. Thereby, the line which the waist side edge of the interior body 200 forms, and the line which the waist side edge of the adhesion part 201 form become substantially parallel, and the non-adhesion part of the waist side edge part of the interior body 200 with respect to the exterior sheets 12F and 12B However, since it does not protrude unnecessarily from the bonded portion 201, the fit, the feeling of wearing, and the appearance are further improved. In such an interior body 200, the continuous laminated body is formed wider than the interior body 200 during manufacture, and the peripheral shape is illustrated by using a punching process when individually cutting the interior body 200 from the continuous laminate body. Can be manufactured by punching into a predetermined shape such as an oval shape. However, since waste material (trim) is generated in this case, as shown in FIG. 16, if either one of the front and rear sides of the interior body 200 has a bulging shape and the other has a hollow shape that fits the bulging shape, When manufacturing the interior body 200, waste material is not generated (trimless) when the continuous laminated body is individually cut along the front and rear boundary lines 205, which is preferable. However, in this case, it is preferable that the end portion of the inner body 200 on the other concave side is joined so as not to be separated from the exterior sheets 12F and 12B. In addition, when the rear end portion (back side end portion) of the interior body 200 has a bulging shape and the front end portion (abdominal side end portion) has a hollow shape, the hollow shape of the front end portion bulges on the lower abdomen of the wearer. Since it fits from below so as to follow, the abdomen side of the diaper is not easily displaced, and the appearance when worn is also good.

  Further, when the barrier cuffs 60 and 61 as shown in the figure are provided, the end flap 203 is also erected by extending the elastic elastic member 63 to the edge on the waist side of the interior body bonding portion 200, and the interior body 200. Can be elastically maintained in the shape of the aforementioned boat. At this time, if the front-rear direction dimension of the front-rear fixing part 67 of the barrier cuffs 60, 61 is shorter than the front-rear direction dimension of the non-adhesive part with the exterior sheets 12F, 12B on both side parts of the interior body 200, non-adhesion Since the contraction force of the entire barrier cuffs 60 and 61 is easily transmitted to the portion, the end flap 203 is more reliably raised. Further, when the end elastic elastic member 202 of the interior body is provided and the elastic elastic members 63 of the barrier cuffs 60 and 61 are arranged so as to intersect the end elastic elastic member 202, the end of the interior body is connected. Since the standing shape of the barrier wall surrounding the character is obtained, it is preferable. Moreover, although not shown in figure, it is a crotch between both sides of the width direction with respect to the sheet | seat which covers parts other than the barrier cuffs 60 and 61, for example, the back surface side of absorbers, such as the liquid-impermeable sheet | seat 11 and the crotch outer sheet | seat 12M. When the elastic elastic member is fixed in the front-rear direction in a state where it is stretched along the front-rear direction from the side to the waist side end, or if it has an elastic elastic member along the front-rear direction, use it, It is also a preferable form to extend this front-rear direction elastic elastic member to the edge on the waist side of the interior body adhesion portion. In this case, as long as the elastic elastic members in the front-rear direction are located on both sides in the width direction of the interior body 200 at the waist end, they may be curved or intersect on the crotch side.

  On the other hand, in the case of a conventional pants-type disposable diaper having a structure composed of an interior body and an exterior sheet, the exterior sheets 12F and 12B and the interior body 200 are formed separately, so that the end of the interior body 200 is exposed. If it does, the level | step difference with exterior sheet 12F, 12B will worsen the touch. For this reason, the exterior sheets 12F and 12B are folded back to the body side at the front and rear ends of the diaper so as to cover the corners of the sheet at the front and rear ends of the diaper and to cover the front and rear ends of the interior body 200. As shown in FIG. 14 and FIG. 14, this configuration can also be adopted in the present invention in order to prevent the non-bonded portion from turning up at the waist side end of the interior body 200. Even in such a structure, if the elastic body is disposed such that a non-bonding portion with the exterior sheets 12F and 12B is formed at the end portion of the interior body 200 and the end flap 203 is erected, the interior body 200 is provided. The adhesive portion 201 of the inner body 200 is recessed in a boat shape when viewed from the inside, the waist side end portion of the interior body 200 fits well against the body, and the end flap 203 pushes up the folded portions of the exterior sheets 12F and 12B from below. It is possible to form an excrement blocking wall similar to that described above. In the illustrated example, only the outer surface side layers of the exterior sheets 12F and 12B are folded. However, in this embodiment, the waist side end portion of the interior body 200 is restrained by the folded portions of the exterior sheets 12F and 12B. Therefore, when the end elastic elastic member 202 is provided, a plurality of thread rubbers having a thickness of about 620 to 1240 dtex, a higher expansion rate (specifically, an expansion rate of about 220 to 280%) than when there is no folded portion. ). Further, if the folded portions of the exterior sheets 12F and 12B are fixed to the interior body 200 only at the crotch side ends, the restraint can be reduced. However, when emphasizing the improvement of fit to the body, as shown in FIG. 5, the interior body 200 is adhered on the portion where the exterior sheets 12F and 12B are folded back to the body side at the front and rear ends of the diaper, More preferably, the entire interior body 200 is exposed to the body side.

  Further, in a form in which the folded portions of the exterior sheets 12F and 12B do not cover the front and rear ends of the interior body 200, the interior body 200 and the exterior sheet 12F are prevented in order to prevent the non-adhesive portion from turning up at the waist side end of the interior body 200. , 12B are preferably welded by ultrasonic sealing or heat sealing because they can be joined firmly. However, since joining by such welding is difficult unless the sheets are thin, an adhesive is generally used for joining the interior body and the exterior sheet. When trying to prevent the non-adhesive portion from turning up, the adhesive used for the interior body bonding portion 201 has high adhesive strength and moderate elasticity that can be deformed following the movement of the non-adhesive portion to turn. preferable. Specifically, synthetic rubber-based hot melt adhesives, particularly styrene-butadiene-styrene (SBS), styrene-isoprene-styrene (SIS), styrene-ethylene-propylene-styrene (SEPS), styrene-ethylene-butadiene- A hot melt adhesive using a styrene rubber base polymer such as styrene (SEBS) is preferable, and an SIS hot melt adhesive having excellent flexibility of the base polymer is most preferable.

Furthermore, it is preferable that the adhesive is applied to the adhesive layer because the adhesive layer has a certain thickness because it is easy to follow the deformation. However, thick coating using a slot coater increases the amount of adhesive used and increases the cost. If the method of applying a hot melt adhesive formed by mixing gas is used, for example, a foam melt applicator manufactured by Nordson Co., Ltd. may be used. good. Such a hot melt adhesive formed into a foam has an appropriate deformation followability and elasticity, and is particularly preferable for the interior body adhesive portion 201 of the present invention. In this case, the application thickness of the adhesive is preferably about 0.5 to 5 mm, more preferably about 1 to 3 mm. In addition, as shown in FIG. 12, when the bulging shape is configured by stacking the interior body bonding portions 201 in a stepped shape in a plurality of rectangular ranges, the bonding is performed in a stepped manner within a thickness range of 0.5 to 5 mm. It is preferable to change the coating thickness of the agent so that the adhesive gradually increases from the crotch side to the end side.
In consideration of adhesion to the skin when the non-adhesive part is turned over, it is preferable to use an adhesive with little tack (or no tack) at room temperature when the adhesive is used for adhesion.

The present invention is suitable for a pants-type disposable diaper.

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 sectional view taken along line 3-3 in FIG. 1. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is a top view in the state where a diaper was developed showing only a principal part of a pants type disposable diaper with a size. It is sectional drawing which shows only the principal part of an underpants type disposable diaper with a dimension. It is a front view of a product state. It is a rear view of a product state. It is a top view in the state where a diaper was developed showing an adhesion part. FIG. 6 is a sectional view taken along line 6-6 of FIG. It is a top view which shows the example of a shape of another adhesion part. It is a top view in the state where the diaper was developed showing the inner surface of other pants type disposable diapers. It is the 7-7 sectional view taken on the line of FIG. It is a top view in the state where the diaper was developed showing the inner surface of other pants type disposable diapers. It is a top view which shows the example of a cutting | disconnection of an interior body.

  DESCRIPTION OF SYMBOLS 10 ... Absorbent main-body part, 11 ... Liquid impervious sheet, 12 ... Exterior sheet, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 52 ... Fiber, 54 ... Super absorbent polymer particle, 56 ... Absorption Body, 58 ... Cover sheet, 60 ... Side barrier cuff, 62 ... Barrier sheet, 70 ... Back elastic sheet, 200 ... Interior body, 201 ... Adhesive part, 202 ... End elastic elastic member, 203 ... End flap part .

Claims (6)

An interior body formed by interposing an absorbent body between the liquid-permeable top sheet and the back surface sheet so as to cover from the back side through the crotch to the abdomen side, and at least front and back on the outer surface of the interior body In a pants-type disposable diaper provided with an exterior sheet that is attached to the waist side end of the outer cover and formed to cover at least the waistline,
While the waist side end of the interior body is bonded to the exterior sheet by the arc-shaped adhesive part at the waist side edge ,
In the interior body adhesion part in the exterior sheet, an elastic elastic member is not provided so as to cross this, or an elastic elastic member is provided, but it is cut so as not to expand and contract,
The waist side elastic elastic member is fixed to the waist side portion of the interior body adhesion portion in the exterior sheet in a state of being stretched along the waistline direction, and both widthwise sides of the interior body adhesion portion in the exterior sheet In this part, a plurality of side elastic elastic members are fixed at intervals in the vertical direction in a state of being stretched along the waistline direction,
The amount of contraction by the waist elastic elastic member is larger than the amount of contraction by the side elastic elastic member, and the amount of contraction of the side elastic elastic member increases from the crotch side toward the waist side. It is configured,
A pants-type disposable diaper characterized by that.   The pants-type disposable diaper according to claim 1, wherein the end elastic stretchable member is fixed in a state of being stretched along a waist-side edge of the bonded portion. The interior body has an end flap portion that does not have an absorber and is not bonded to the exterior sheet at the front end portion of the waist side end portion, and the end elastic elastic member in the end flap portion The underpants-type disposable diaper according to claim 2, wherein The pants-type disposable diaper according to any one of claims 1 to 3 , wherein an edge on the waist side of the interior body is formed in a shape along the edge on the waist side of the bonded portion. A longitudinal elastic stretch member is fixed to both sides of the interior body in the width direction from the crotch side to the waist side end portion in a stretched state in the longitudinal direction, and the longitudinal elastic stretch member is bonded to the interior body. The underpants type disposable diaper of any one of Claims 1-4 extended to the edge of the waist side of a part. On both sides in the width direction of the interior body, belt-shaped barrier cuffs standing on the body side are provided from the front end to the rear end of the interior body along the front-rear direction.
Among the front end portion, the rear end portion and the intermediate portion between these barrier cuffs, the front end portion and the rear end portion are fixed to the top sheet in a folded state so as not to stand, and the intermediate portion is The pants-type disposable diaper according to claim 5 , wherein the pants-type disposable diaper is not fixed, and is fixed to at least an intermediate portion of the elongate elastic stretchable member as the front-rear elastic stretchable member extending along the front-rear direction.

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