JP5848084B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as disposable diapers and sanitary napkins.

  Absorbent articles that absorb and retain excrement are provided between a top sheet and a back sheet in absorbent articles such as general disposable diapers and sanitary napkins. And as this absorber, in addition to a pulp absorber in which pulp fibers and superabsorbent polymer particles are mixed and mixed, a filament aggregate obtained by opening a synthetic fiber tow such as cellulose acetate is used. On the other hand, a superabsorbent polymer particle is dispersed and the superabsorbent polymer particle is mixed in the gap between the filaments (hereinafter also referred to as a filament absorber).

  In particular, the filament absorber is much more flexible than the pulp absorber, has the advantage of being able to maintain sufficient shape even when lightweight and thin (low basis weight), and is less susceptible to heat accumulation. Although it can be said that it is inferior to a pulp absorber in that there is almost no water, the water absorption can be supplemented with highly absorbent polymer particles.

However, the conventional filament absorber not only has a wide filament gap but also easily spreads by an external force, and therefore has a poor ability to hold dry highly absorbent polymer particles. For this reason, the superabsorbent polymer particles fall off from the filament assembly during the manufacture of the product or during the distribution process (especially when the crotch is folded in two when the crotch is folded and transported with the crotch down) or during use. The problem is that it is unevenly distributed (concentrated) in the lower part of the body, etc., adversely affecting the absorption performance etc., for example (A) The superabsorbent polymer particles concentrated in the crotch part will rise into a hump shape due to water absorption, making the comfort uncomfortable Not only will the difference in height between the three-dimensional gather and the surface of the article become low, and leakage will easily occur.
(B) Absorption capacity varies between the left and right of the absorber,
(C) The concentration of SAP in the crotch portion reduces the absorption capacity of the front and rear ends of the absorbent body, resulting in abdominal leakage and back leakage.
There was a problem.

  In addition, when the superabsorbent polymer particles fall off from the filament aggregate, there is a problem in that the user feels a sense of incongruity when touched by the hand.

  In order to solve these problems, the present applicant has provided a holding sheet for holding the superabsorbent polymer particles dropped from the filament aggregate on the back side of the filament aggregate, or roughened the surface of the retention sheet. Or by applying an adhesive, it has been proposed to improve the particle retention in the holding sheet (see Patent Documents 1 and 2).

  However, in the holding sheet in this preceding example, in order to obtain sufficient particle holding ability, a sheet having a certain thickness is required as the holding sheet, and the advantage of using the filament aggregate (flexibility, lightweight and thinness) However, there is a problem that the air permeability is slightly impaired.

JP 2006-149664 A JP 2007-097716 A

  Therefore, the main problem of the present invention is to prevent uneven distribution of the superabsorbent polymer particles without impairing the advantages of using the filament aggregate.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A liquid-permeable top sheet, a liquid-impervious sheet, and an absorbent element provided between the top sheet and the liquid-impervious sheet,
The absorbent element has an absorbent body in which the superabsorbent polymer particles are movably held in the filament aggregate and a portion located on the back side of the absorbent body, and the superabsorbent polymer particles that have escaped from the absorbent body And a holding layer for holding
The holding layer includes a back sheet disposed on the back side, a front sheet disposed on the front side of the back sheet, and a plurality of wrinkles extending in the longitudinal direction arranged in parallel in the width direction, and absorption of wrinkles on the front sheet which has a elongate inflation elastically stretchable member secured under tension along the longitudinal direction in the side portion, said back side sheet and the back side sheet side bottom you located on both sides in the width direction of the folds of the face sheet Are joined to form a joined portion, and between these joined portions, the back side sheet and the front side sheet are not joined, and a cylindrical cell along the longitudinal direction is formed,
The expansion and contraction of the elastic elastic member for expansion causes the cell to bulge so that it can be deformed and restored while curving so that both front and rear sides of the cell are lifted, The superabsorbent polymer particles that escape from the absorbent body are held between the front sheet sheets,
An absorbent article characterized by the above.

(Function and effect)
If there is a holding layer with such a cell structure on the back side of the absorber, the superabsorbent polymer particles that have fallen off from the filament aggregate are received by the holding layer, and the gap between the wrinkles approaching the wrinkle surface of the front sheet or the front sheet Held in between. Therefore, even if the superabsorbent polymer particles on the holding layer try to roll and move, the movement is obstructed and prevented by the unevenness. In addition, since the expanded cells are slightly crushed by external forces such as their own weight and absorber weight, the gap between the front sheet is narrow, and the superabsorbent polymer particles entering here are sandwiched from both the front and back sides, etc. Further, movement in the direction along the cell (longitudinal direction) is also inhibited, and movement toward the crotch side, which is the lower side in the mounted state and the product state, is effectively suppressed. Therefore, according to the present invention, the superabsorbent polymer particles that have fallen off from the filament aggregate are less likely to be unevenly distributed (concentrated) in a low part such as the crotch part, and in the absorption performance such as the above (A) to (C) The problem can be suppressed. Moreover, since the holding layer of the present invention is composed of a plurality of deformable / recoverable cell structures, it is soft per se and has the advantages of using a filament assembly (flexibility, lightweight thinness, breathability, etc.). It is not impaired, and in particular, air permeability is improved because a space is formed on the back side of the absorber. In addition, the holding layer having the cell structure as described above has an advantage that it can be easily and inexpensively manufactured by an existing manufacturing technique.
On the other hand, for example, when a non-woven fabric having irregularities formed by embossing or fluffing is used as the retaining layer, the irregularities are liable to be crushed and difficult to return to the original shape. In addition, if the unevenness is formed of a material that does not collapse even when a certain force is applied, the skin may be marked after sitting on it, which may cause a rash.

<Invention of Claim 2>
The absorptive article according to claim 1 in which a vent is perforated in a portion used as a side wall of said cell in said front side sheet.

(Function and effect)
When such a vent is provided, the cell repeatedly expands and contracts due to the movement of the wearer sitting, standing or walking, and the air inside and outside the cell enters and exits, and the air circulation inside the absorbent body through the cell is promoted. As a result, moisture easily escapes from the absorber.

<Invention of Claim 3>
The absorptive article according to claim 1 or 2 with which a part or all of said absorber is provided between the ridges of said front side sheet.

(Function and effect)
As described above, when a part or all of the absorber is provided in advance between the ridges of the front sheet, which is a holding gap for the superabsorbent polymer particles, the effect of preventing the uneven distribution of the superabsorbent polymer particles is further enhanced. It will be a thing.

<Invention of Claim 4>
The said front sheet | seat is a liquid-permeable sheet, The superabsorbent polymer particle is included in the said cell separately from the superabsorbent polymer particle contained in the said absorber, The any one of Claims 1-3 Absorbent article according to item.

(Function and effect)
By adopting such a structure, the inside of the cell can be used as a liquid absorption holding space.

<Invention of Claim 5>
The backsheet side bottom you positioned between the folds of the front sheet, longitudinally spaced joined to the backing sheet non-inflatable portion is formed, a plurality of the cells separated by the non-inflatable portion The absorptive article according to any one of claims 1 to 4, wherein are arranged in parallel in the vertical direction.

(Function and effect)
Since the region where the cells continue in the vertical direction is warped so that both the front and rear sides are lifted by contraction of the elastic elastic member for expansion, when a non-expanded portion is intermittently provided in the vertical direction in this way, a plurality of warped portions are formed, This warping also exhibits the function of inhibiting the longitudinal movement of the superabsorbent polymer particles. Therefore, this structure further enhances the effect of preventing uneven distribution of the superabsorbent polymer particles in the vertical direction.

  As described above, according to the present invention, there are advantages such as being able to prevent uneven distribution of superabsorbent polymer particles without impairing the advantages of using a filament assembly.

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 development state of a maintenance layer. It is a top view in the development state of a maintenance layer. It is a perspective view of a pants type disposable diaper. It is a photograph of the sample of a holding layer. It is a principal part enlarged photograph of the sample of a retention layer. It is a principal part enlarged photograph of the sample of a retention layer. It is a top view in the development state of a maintenance layer. It is sectional drawing of a holding layer.

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 pants-type disposable diaper 100 includes an exterior sheet 12 that forms the outer surface (rear surface) of the product and an interior body 200 that is attached to the inner surface of the exterior sheet 12. Symbol Y indicates the total length of the diaper in the deployed state (the length in the vertical direction 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 deployed state. The full width of is shown.

  The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior sheet 12 is a part that is worn by the wearer. In addition, the dot pattern part in sectional drawing has shown the junction part which joins each structural member, and is formed by solid, beads, curtains, summits, spiral application, etc., such as a hot-melt-adhesive. In addition, “front-rear direction” means a direction connecting the ventral side (front side) and the back side (rear side), “width direction” means a direction (left-right direction) perpendicular to the front-rear direction, and “up-down direction Is the wearing state of the diaper 100, that is, the direction perpendicular to the waistline direction when the diaper 100 is folded in two at the crotch so that both sides of the front body and the back body of the diaper 100 overlap each other, in other words It means the direction connecting the waist opening WO side and the crotch part side.

(Exterior sheet)
The exterior sheet 12 has a part constituting the front body F extending from the crotch part to the ventral side and a part constituting the rear body B extending from the crotch part to the back side, and both sides of the front body F As shown in FIG. 8, a waist opening WO for passing the wearer's torso and a pair of left and right leg openings LO for passing the legs are formed. It is what. Reference numeral 12A denotes a joining portion (hereinafter, this portion is also referred to as a side seal portion). The crotch portion means the center in the front-rear direction from the waist edge of the front body F to the waist edge of the back body B in the unfolded state, and the front part and the back part thereof are the front body F and Each back body B is meant.

  The exterior sheet 12 includes a waistline portion T defined as a front-rear direction range extending from the waist opening WO to the upper end of the leg opening LO, and a front-rear direction range of the portion forming the leg opening LO (the side seal portion 12A of the front body F). And an intermediate portion L defined as a front-rear direction region having a side seal portion 12A of the back body B. The waistline T can be divided into a “waist edge” W that conceptually forms the edge of the waist opening, and a “waist lower part” U that is a lower part than this. These lengths in the vertical direction vary depending on the size of the product and can be determined as appropriate. For example, the waist edge 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 portion L are bundled along the circumference of the wearer's leg, and this is a portion into which the wearer's leg is put. As a result, the exterior sheet 12 has a substantially hourglass shape as a whole. The degree of tightness of the exterior sheet 12 can be determined as appropriate, and, as shown in FIGS. 1 to 8, the narrowest part may be narrower than the width of the interior body 200 in order to obtain a clean appearance. Although it is preferable, the narrowest part may be determined so as to be equal to or larger than the width of the interior body 200.

  As shown in FIGS. 3 to 5, the exterior sheet 12 is formed by bonding two sheet base materials 12 </ b> S and 12 </ b> H with an adhesive such as a hot melt adhesive, and is located on the inner side. Although the base material 12H extends only to the edge of the waist opening WO, the outer sheet base material 12S wraps around the waist side edge of the inner sheet base material 12H and is folded back to the inside. 12r is extended so that it may coat | cover up to the waist side edge part of the interior body 200. FIG.

The sheet base 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, it is preferable that the basic weight shall be about 10-30 g / m < ² >.

In addition, the total basis weight of the exterior sheet 12 is preferably about 20 to 60 g / m ² so that the design of the printed sheet 25 and the like to be described later can be satisfactorily visually recognized through the exterior sheet 12. The total light transmittance defined in K 7105 is preferably 40% or more, particularly 50% or more.

  The exterior sheet 12 is provided with elongate elastic members 15 to 19 such as thread rubber at a predetermined elongation rate between the sheet bases 12S and 12H in order to improve the fit to the waistline. As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. For bonding the sheet bases 12S and 12H of the exterior sheet 12 and fixing the elongated elastic members 15 to 19 sandwiched therebetween, hot melt bonding or heat sealing or ultrasonic bonding by various coating methods is used. Can do. If the entire exterior sheet 12 is firmly fixed, the texture of the sheet is impaired, which is not preferable. By combining these, it is preferable that the elongated elastic elastic members 15 to 19 are firmly bonded, and other portions are not bonded or bonded weakly.

More specifically, the entire width direction is continuous between the inner surface of the inner sheet base 12H and the outer surface of the folded portion 12r of the outer sheet base 12S at the waist edge W of the rear body B and the front body F. As described above, the plurality of waist edge elastic elastic members 17 are fixed in a state of being spaced apart in the vertical direction and extended along the width direction at a predetermined extension rate. In addition, one or more of the waist edge elastic elastic members 17 disposed in a region adjacent to the waist lower portion U may overlap with the interior body 200 or may be overlapped with the interior body 200 in the width direction. You may each provide in the width direction both sides except a 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 base 12H and the inner side surface of the outer sheet base 12S in the lower waist U of the front body F and the rear body B, except for the widthwise central portion overlapping the interior body 200, A plurality of waist lower elastic elastic members 15, 19 made of an elongated elastic elastic member are continuously provided over the entire width direction on each of the upper side and both sides in the width direction, with a predetermined interval in the vertical direction 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 to It is preferable to fix the thread rubber of about 1.0 mm ² ) at an interval of 1 to 15 mm, particularly 3 to 8 mm, and about 5 to 30 at an elongation of 200 to 350%, particularly about 240 to 300%.

  Moreover, between the outer side surface of the inner sheet base material 12H and the inner side surface of the outer sheet base material 12S in the intermediate part L of the front body F and the back body B, except for the center part in the width direction overlapping the interior body 200, A plurality of intermediate elastic expansion / contraction members 16 made of an elongated elastic expansion / contraction member are provided in each part on both sides in the width direction so as to be continuous over the entire width direction. It is fixed in a stretched state along the direction.

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%.

  As shown in the figure, when the waist lower elastic elastic member and the intermediate elastic elastic members 15, 19, 16, 18 are respectively provided on both sides in the width direction except for the central portion in the width direction overlapping the interior body 200. The interior body 200 does not shrink more than necessary in the width direction, so that it does not look bad or absorbs. 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. At the center in the width direction, the elastic expansion / contraction member is finely 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 configured as the contraction force acting portions. Are also included. Of course, the arrangement of the waist lower elastic members 15, 19, 16, and 18 is not limited to the above example, and the waist lower portion so that the elastic force acts on the entire width of the waist lower U. A part or all of the elastic elastic member and the intermediate elastic elastic members 15, 19, 16, 18 can be provided across the interior body 200 from one side in the width direction to the other side.

  Further, when the elongated elastic elastic members 15 to 19 of each part cross the design of the print sheet 25 and the like described later, when rubber containing titanium oxide is used as the elongated elastic elastic members 15 to 19, It is preferable to use one having a low content (for example, 2% or less) or one containing no titanium oxide.

(Post-processing tape)
A post-processing tape 70 (fixing means) can be provided at the center in the width direction on the outer surface of the rear body B of the exterior sheet 12. The post-processing tape 70 is for fixing the diaper 100 in a state of being rounded or folded so that the top sheet 30 is on the inner side and the front body F is on the inner side. As shown in FIG. 5, in the general post-processing tape 70, a base end portion 71 is fixed to the outer surface of the exterior sheet 12 with an adhesive or the like, and a portion on the front end side of the base end portion 71 is tri-folded. (Folded in a Z-shaped cross section) or folded in half, and the portion between the folded portions is fixed (temporarily fixed) by the temporary fixing adhesive 72 so as to be peelable. Moreover, while having the knob | pick part 73 colored in opaque colors, such as white, in the front-end | tip part, the part except this knob | pick part 73 is transparent or semi-transparent, Through the transparent or semi-transparent part in this post-processing tape 70, A design to be described later is visible from the outer surface side of the post-processing tape 70. Although a specific structure can be appropriately configured, in the illustrated embodiment, the whole is formed by connecting a plurality of transparent or semi-transparent substrates in the longitudinal direction, and a colored tape 74 is bonded to the knob 73. Is adopted.
At the time of disposal, the diaper 100 is rolled or folded so that the top sheet 30 is on the inside and the front body F is on the inside, and then the folded portion of the post-processing tape 70 is peeled off and spread, and the diaper 100 is rolled or folded. The diaper 100 is fixed with an adhesive so as to be wound from the rear body B of the diaper 100 to the outer surface on the opposite side over the waist opening WO. The post-processing tape 70 is particularly preferably a tri-fold shape that can be folded compactly when not in use and can be expanded into a long shape when in use.
Fixing means such as the post-processing tape 70 may be provided on the front body F or on both the back body B and the front body F.

(Print sheet)
Between the liquid-impermeable sheet 11 and the exterior sheet 12 (including the interlayer of the exterior sheet 12), a print sheet 25 that is designed by printing is provided. The exterior sheet 12 may be omitted, and the print sheet 25 may be exposed on the outer surface. The printed sheet 25 in the illustrated example has a smaller area than the body on which the printed sheet 25 is disposed, and is provided separately for the front body F and the back body B, but passes through the crotch from the front body F. It can also be provided so as to continue to the back body B integrally.
Although the size and shape of the printing sheet 25 are not particularly limited, it is preferable to sufficiently increase the area in order to make the function sufficient. For example, the width of the printing sheet 25 is 50 to 120 of the width of the absorber 56. The length of the printing sheet 25 is preferably about 15 to 30% of the total length Y of the article on at least one side of the stomach side and the back side. Further, the shape of the print sheet 25 is preferably a rectangle as shown in the figure in that trim loss does not occur. However, the print sheet 25 has a geometric shape such as a circle, an ellipse, a triangle, a hexagon, or a shape along the periphery of the design. You may cut it.
As the sheet base material of the printing sheet 25, a plastic film, non-woven fabric, paper, or the like can be used, but a bulky material having high air permeability is preferable. When using a plastic film, it is desirable to have moisture permeability in order to prevent stuffiness. Nonwoven fabrics and paper are preferable because they have moisture permeability, and when performing design printing, it is preferable to use nonwoven fabrics that are smooth and easy to print, and papers that are high in strength and difficult to bleed ink. Particularly preferred are basis weight 15 to 35 g / m ² approximately, crepe paper having a thickness of about 0.1 to 0.3 mm (thin paper) and a basis weight 10 to 25 g / m ² approximately, a thickness of about 0.1 to 0.3 mm Non-woven fabrics (especially spunbond nonwoven fabrics and SMS nonwoven fabrics having a spunbond portion having a fineness of about 1.0 to 3.0 dtex). When crepe paper is used, the crepe rate is preferably about 5 to 20%, particularly about 5 to 15%. If the crepe rate is 20% or more, the amount of ink fixed increases, but blurring occurs and is not suitable for design printing. If the crepe rate is 5% or less, the amount of fixing is small because the ink hardly penetrates.

(Exterior sheet split structure)
In the above-described example, the front body F to the back body B are continuously covered with the integral exterior sheet 12, but the exterior sheet covers the stomach side of the wearer's waist and the back side The front end portion of the interior body is connected to the inner surface of the center portion in the width direction of the abdominal side exterior sheet with a hot melt adhesive or the like, and the center portion in the width direction of the back side exterior sheet. The rear end of the interior body is connected to the inner surface by a hot melt adhesive or the like, and the form in which the abdominal exterior sheet and the back exterior sheet are not continuous on the crotch side and are separated from each other may be adopted. it can. This separation distance can be about 150 to 250 mm. In this case, the back surface of the liquid-impervious sheet in the interior body is crotch so as to cover the entire back surface of the interior body or to cover the entire exposed part between the abdominal exterior sheet and the back exterior sheet. A partial exterior sheet can also be fixed. As the crotch outer sheet, the same material as that used for the outer sheet described above can be used. The crotch outer sheet also corresponds to the outer sheet of the present invention.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. The inner body 200 is a main body that takes an absorption function. As shown in FIGS. 3 to 5, the top sheet 30 that is on the body side, the liquid-impervious sheet 11, and an absorbent element interposed therebetween. The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. 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.

(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.
When the three-dimensional gather 60 is provided, both sides of the top sheet 30 pass between the liquid-impervious sheet 11 and the three-dimensional gather 60 to reach the back side of the absorbent element 50, and in order to prevent liquid penetration, It is preferable to adhere to the liquid-permeable sheet 11 and the three-dimensional gather 60 with a hot melt adhesive or the like.

(Intermediate sheet)
In order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50, an intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid transmission rate than the top sheet 30 can be provided. This intermediate sheet 40 not only rapidly transfers the liquid to the absorbent element 50 and enhances the absorption performance by the absorbent element 50, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent element 50, Can always be in a dry state. 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 material fibers of the nonwoven fabric is preferably 2.2 to 10.0 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.

(Impermeable 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 in which a plastic film is provided 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. In the liquid-impervious sheet 11, it is preferable to use a liquid-impervious and moisture-permeable material that has been preferred in recent years 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 micro-denier fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as applying a 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 is preferably extended to both sides of the side surface of the top sheet 30 of the absorbent element 50 so as to improve leakage resistance. 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 with 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 urine and soft stool that move in the lateral direction along the top sheet 30, and prevents side leakage. It is provided for this purpose. 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 elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. An end portion of the three-dimensional gather 60 opposite to the folded portion in the width direction is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200, and portions other than the attachment portion 65 protrude from the attachment portion 65. It is set as the protrusion part 66 (part by the side of a folding | turning part). Further, both end portions in the front-rear direction of the protruding portion 66 extend from the mounting portion 65 to the side surface of the top sheet 30 through the side portion of the interior body 200 and are hot-melted with respect to the side surface of the top sheet 30. The base side portion is fixed to the front and rear fixing portion 67 by an adhesive or heat seal, and the tip side portion is folded back outward in the width direction from the tip of the base side portion and fixed to the base side portion. An intermediate part in the front-rear direction of the protruding part is an unfixed free part (inner free part), and an elongated gather elastic elastic member 63 along the front-rear direction is fixed to the free part in an extended state.

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 gather elastic elastic member 63, thread rubber or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of 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.

  The number of gather elastic elastic members 63 provided in the free part of the three-dimensional gather 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 gather elastic elastic member 63, it will become easy to contact | abut with respect to skin. The gather elastic elastic member 63 may be disposed not only at the tip 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 configured in this way, the contraction force of the gather elastic elastic member 63 acts so as to bring the both ends in the front-rear direction close to each other. Thus, since they are non-fixed free portions, only the free portions stand so as to abut on 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.

(Absorber)
The absorber 56 is formed by holding superabsorbent polymer particles 54 in a filament aggregate 52 so as to be movable. 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. When the shape is formed, it is preferable because the fit of the absorber 56 itself and the three-dimensional gather 60 around the legs is improved.
Moreover, although the dimension of the absorber 56 can be determined suitably, it is preferable to extend to the peripheral part of the interior body 200 or its vicinity in the front-back direction and the width direction. Reference numeral 56X indicates the width of the absorber 56.

(Filament assembly)
The filament aggregate 52 can be obtained by opening a tow (fiber bundle). The filament assembly 52 is incorporated so that the continuous direction of the constituent filaments is the front-rear direction or the width direction of the diaper, and is also incorporated in the thickness direction. Can do.

  As the filament, for example, polysaccharides or derivatives thereof (cellulose, cellulose ester, chitin, chitosan, etc.), synthetic polymers (polyethylene, polypropylene, polyamide, polyester, polylactamamide, polyvinyl acetate, etc.) can be used. In particular, cellulose ester is preferable.

  Examples of the cellulose ester that can be suitably used include organic acid esters such as cellulose acetate, cellulose butyrate, and cellulose propionate; mixed acid esters such as cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, and cellulose nitrate acetate. And cellulose ester derivatives such as polycaprolactone-grafted cellulose ester can be used. These cellulose esters can be used alone or in admixture of two or more. The viscosity average degree of polymerization of the cellulose ester is, for example, about 50 to 900, preferably about 200 to 800. The average substitution degree of the cellulose ester is, for example, about 1.5 to 3.0 (for example, 2 to 3).

  The average degree of polymerization of the cellulose ester can be, for example, 10 to 1000, preferably 50 to 900, and more preferably about 200 to 800. The average degree of substitution of the cellulose ester is, for example, about 1.0 to 3.0. Preferably it is 1.0-2.15, More preferably, it can be set as about 1.1-2.0. The average degree of substitution of the cellulose ester can be selected from the viewpoint of enhancing biodegradability.

  As the cellulose ester, an organic acid ester (for example, an ester with an organic acid having about 2 to 4 carbon atoms), particularly cellulose acetate is suitable. The degree of acetylation of cellulose acetate is often about 43 to 62%, but about 30 to 50% is particularly preferable because it is excellent in biodegradability. A particularly preferred cellulose ester is cellulose diacetate.

  The filament may contain various additives such as a heat stabilizer, a colorant, an oil agent, a yield improver, a whiteness improver, and the like.

  The fineness of the filament is, for example, 1.0 to 16.0 dtex, preferably 1.0 to 10.0 dtex, and more preferably 1.0 to 5.0 dtex. 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. When crimped fibers are used, a bulky and light absorbent body 56 can be produced, and a tow with high integrity can be easily produced by entanglement between the fibers. The cross-sectional shape of the filament 52 is not particularly limited, and may be any of, for example, a circular shape, an oval shape, an irregular shape (for example, a Y shape, an X shape, an I shape, an R shape) or a hollow shape. Good. For example, the filament is used in the form of a tow (fiber bundle) formed by bundling about 3,000 to 1,000,000, preferably about 5,000 to 1,000,000 single fibers. Can do. The fiber bundle is preferably formed by concentrating about 3,000 to 1,000,000 filaments 52.

  The tow is weakly entangled between the filaments, and the filament aggregate 52 that has opened the toe is independent of each filament, and the gap between the filaments is widened, or the gap is easily widened by an external force. I will. Therefore, in order to prevent this, it is also a preferable form that the filaments are joined in the form of dots to form a network structure. As a result, the gap between the filaments is reduced or regulated.

  This joining is preferably performed after the opening of the tow, but can also be performed during or before the opening. When filament bonding is performed after opening, the number of bonding points is relatively small and a loose network structure is obtained, and the improvement in particle retention is moderate. As a result, a large network structure is formed, and the particle holding force tends to be excessively increased.

  As a method for joining filaments, for example, a chemical heating method such as heat sealing or ultrasonic sealing, or a chemical method such as welding with a solvent or adhesion with an adhesive can be employed. In the latter case, a method of adhering or welding the contact portions between the fibers by applying a solvent or an adhesive to the filament aggregate 52 by spraying or the like is preferable.

  Such solvents or adhesives include ester plasticizers such as triacetin, triethylene glycol diacetate, triethylene glycol dipropionate, dibutyl phthalate, dimethoxyethyl phthalate, triethyl citrate, and various resin adhesives. In particular, a thermoplastic resin can be used. Thermoplastic resins include water-insoluble or poorly water-soluble resins and water-soluble resins. If necessary, a water-insoluble or poorly water-soluble resin and a water-soluble resin can be used in combination.

  Examples of water-insoluble or poorly water-soluble resins include polyethylene, polypropylene, ethylene-propylene copolymers, olefinic homo- or copolymers such as ethylene-vinyl acetate copolymers, polyvinyl acetate, polymethyl methacrylate, methacryl Acid methyl-acrylic acid ester copolymer, acrylic resin such as copolymer of (meth) acrylic monomer and styrene monomer, polyvinyl chloride, vinyl acetate-vinyl chloride copolymer, polystyrene, styrene monomer ( Styrenic polymers such as copolymers with (meth) acrylic monomers, optionally modified polyesters, nylon 11, nylon 12, nylon 610, nylon 612 and other polyamides, rosin derivatives (eg, rosin esters), Hydrocarbon resin (eg terpene tree , Dicyclopentadiene resins, and petroleum resins), and hydrogenated hydrocarbon resins. One or two or more of these thermoplastic resins can be used.

  Examples of water-soluble resins include various water-soluble polymers such as polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl ether, vinyl monomers, and copolymerizable monomers having a carboxyl group, a sulfonic acid group, or a salt thereof. Vinyl water-soluble resins such as copolymers, acrylic water-soluble resins, polyalkylene oxides, water-soluble polyesters, water-soluble polyamides, and the like can be used. These water-soluble resins can be used alone or in combination of two or more.

  Various additives such as stabilizers such as antioxidants and ultraviolet absorbers, fillers, plasticizers, preservatives, and antifungal agents may be added to the thermoplastic resin.

  Since the tow can be produced by a known method, details are omitted. Cellulose diacetate tow bales that can be suitably used in the absorbent element 50 are commercially available from Celanese, Daicel Chemical Industries, and the like. Cellulose diacetate tow bale has a density of about 0.5 g / cm 3 and a total weight of 400-600 kg. From this bale, the tow is peeled off and spread into a wide band so as to have a desired size and bulk. The opening width of the tow is arbitrary, and can be, for example, about 100 to 2000 mm, preferably about 100 to 300 mm, which is the width of the absorbent body 56 of the product.

By adjusting the degree of opening of the tow, the basis weight of the filament, the amount used, etc. can be adjusted. The basis weight and use weight of the filament can be determined as appropriate within the scope of the present invention. In the present invention, the basis weight of the filament assemblies in the absorbent element 50 is 30~300g / m ² about, particularly preferably 30 to 120 g / m ² approximately.

  Tow opening methods include, for example, a method in which the tow is spread over a plurality of opening rolls and the tow width is gradually expanded as the tow progresses, and the tow tension (extension) and relaxation (contraction) And the like, and a method of widening and opening using compressed air can be used.

(Superabsorbent polymer particles)
The superabsorbent polymer particles 54 include “powder” in addition to “particles”. As the superabsorbent polymer particles 54, those used for this type of absorbent article 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 ratio of particles remaining on the sieve is preferably 30% by weight or less, and the ratio of particles remaining on the sieve by sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006). Is preferably 60% by weight or more.

  The material of the superabsorbent polymer particle 54 can be used without any particular limitation, but the water absorption (JIS K7223-1996 “Test method for water absorption of superabsorbent resin”) is 40 g / g or more, particularly 60 g / g or more. Are preferred. Examples of the superabsorbent polymer particles 54 include starch-based, cellulose-based and synthetic polymer-based polymers, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethylcellulose. A cross-linked product or an acrylic acid (salt) polymer can be used. The shape of the superabsorbent polymer particles 54 is preferably a granular material that is usually used, but other shapes can also be used.

  As the superabsorbent polymer particles 54, those having a water absorption rate (JIS K7224-1996 water absorption rate test method of superabsorbent resin) of 45 to 20 seconds are suitably used, and in particular, 42 to 25 seconds, particularly 38 to 25 seconds. Are preferred. If the water absorption rate exceeds 40 seconds, if the absorption rate is slow, the body fluid supplied into the absorber 56 may return to the outside of the absorber 56, or leakage may occur. There is a possibility that the diffusibility is deteriorated and the absorption is repeatedly deteriorated.

The basis weight and use weight of the superabsorbent polymer particles 54 in the absorbent element 50 can be determined within the scope of the present invention. In the present invention, the basis weight of the superabsorbent polymer particles 54 obtained by dividing the total weight of the superabsorbent polymer particles in the absorbent element 50 by the total area of the filament aggregate is 50 to 350 g / m ² , particularly 200 to 350 g / m. m ² is preferred. If the basis weight of the superabsorbent polymer particles 54 is excessively small, leakage may occur, and if it is excessively large, gel blocking may occur and diffusibility and repeated absorption may be deteriorated.

(Distribution of superabsorbent polymer particles, etc.)
If necessary, the amount of at least one of the superabsorbent polymer particles 54 and the filament aggregate (hereinafter also referred to as an absorbent material) can be increased or decreased in the planar direction of the absorber 56. For example, the amount of the body fluid excretion site can be increased more than other sites. When considering gender differences, men can increase the amount on the front side and women can increase the amount in the center. In addition, a portion where the absorbent material does not exist locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.
In addition, the amount of the absorbent material can be increased or decreased in the thickness direction of the absorbent element 50. When emphasizing versatility, it is desirable that the superabsorbent polymer particles 54 (SAP particles) be dispersed substantially throughout the thickness direction of the absorbent element 50 at least in the body fluid receiving region. When there is no SAP particle in the upper part, the lower part, and the middle part of the absorbent element 50, or there is very little, it cannot be said that it is "dispersed in the whole thickness direction". Therefore, “distributed in the entire thickness direction” means “distributed unevenly in the upper, lower, and / or middle portions of the filament aggregate 52 in addition to the form“ uniformly ”distributed in the entire thickness direction. However, it is still included in the form of being dispersed in the upper, lower and middle portions. In addition, a form in which some SAP particles do not enter the filament aggregate 52 and remain on the surface thereof, or some SAP particles pass through the filament aggregate 52 and on the backing sheet such as the packaging sheet 58. Certain forms are not excluded.

(Packaging sheet)
As the material of the packaging sheet 58, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet having small holes, and 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 .
Although the packaging form of the packaging sheet 58 can be determined as appropriate, from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles 54 from the front and rear edges, the front and back surfaces and both side surfaces of the absorbent body 56 are surrounded. It is preferable to wind in a cylindrical shape, and to protrude the front and rear edges of the absorber 56 from the front and rear, and to squeeze the protruding portion in the front and back direction and join them by a joining means such as a hot melt adhesive.

(Holding layer)
On the back side of the absorber 56, a characteristic holding layer 80 that holds the superabsorbent polymer particles 54 that have escaped from the absorber 56 is provided. More specifically, as shown in the enlarged portion of FIG. 3 and FIG. 6, the holding layer 80 is disposed on the back side sheet 81 disposed on the back side and on the front side of the back side sheet 81 and extends in the vertical direction. A front side sheet 82 in which a plurality of ridges are arranged in the width direction, and an elongate inflatable shape that is fixed in a stretched state along the longitudinal direction to the absorbent body 56 side portion of the ridges of the front side sheet 82 by a hot melt adhesive or the like In addition to having the elastic elastic member 83, the back sheet 81 and the bottom of the front sheet 82 on each side of the front sheet 82 are joined by heat sealing or the like to form a joint 84, and between these joints 84, the back sheet 81 and the front sheet | seat 82 are not joined, but the cylindrical cell 85 along a vertical direction is formed. As shown in FIGS. 9 and 10, the cell 85 expands into a cylindrical shape that can be deformed and restored by contraction of the elastic elastic member 83 for expansion, and the gap between the heels that approach the heel surface of the front side sheet 82 and The superabsorbent polymer particles 54 that have come out of the absorbent body 56 are held between the front sheet 82.

  As the expansion elastic member 83, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 470 to 620 dtex. 100-200% of the elongation rate at the time of fixation is preferable, and 120-180% is more preferable. The term “elongation rate” means a value when the natural length is 100%.

  The dimensions and the like of the cell 85 can be determined as appropriate, but the widthwise interval in the natural state (expanded state) is about 0 (closely attached) to about 10 mm, and the outer diameter (the cell 85 has a cylindrical shape with a perfect circular cross section). The diameter is preferably about 10 to 30 mm. Therefore, the width of the joint portion 84 is 0 (in close contact) to about 30 mm, the interval in the width direction of the joint portion 84 is about 10 to 40 mm, and the width in the unfolded state of the flange portion of the front side sheet 82 (the circumference in the cross section). The direction length is preferably about 3 to 50 mm. The shape of the joint portion 84 can be an appropriate shape such as a dotted line shape in addition to a linear shape.

  When the holding layer 80 having such a cell 85 structure is present on the back side of the absorbent body 56, the superabsorbent polymer particles 54 that have fallen off from the filament aggregate 52 are received by the holding layer 80 and approach the surface of the ridges of the front side sheet 82. It is held between the ridges and the ridges of the front sheet 82. Therefore, even if the superabsorbent polymer particles 54 on the holding layer 80 try to roll and move, the movement is obstructed and prevented by the unevenness. Further, since the expanded cell 85 is slightly crushed by an external force such as its own weight or the weight of the absorber 56, the gap between the ribs of the front sheet 82 is narrow, and the superabsorbent polymer particles 54 entering here are on both sides The movement in the direction along the cell 85 (vertical direction), such as being sandwiched between the two, is also inhibited, and the movement toward the lower crotch side in the mounted state and the product state is effectively suppressed. Therefore, the superabsorbent polymer particles 54 that have fallen off from the filament aggregate 52 are less likely to be unevenly distributed (concentrated) at low places such as the crotch portion, and problems in absorption performance and the like can be suppressed. In addition, since the holding layer 80 of the present invention is composed of a plurality of deformable / recoverable cell 85 structures, the holding layer 80 is soft per se and has the advantage of using the filament assembly 52 (flexibility, lightweight thinness, breathability). Etc.), and in particular, the air permeability is improved because a space is formed on the back side of the absorber 56. Further, the holding layer 80 having the cell 85 structure as described above has an advantage that it can be easily and inexpensively manufactured by an existing manufacturing technique.

  As the elastic elastic member 83 for expansion, thread rubber having the same thickness as the elastic elastic member 63 can be used, and the expansion rate at the time of fixation can be the same as that of the elastic elastic member 63. When the elastic expansion / contraction member 83 is fixed at a lower elongation rate than the gather elastic expansion / contraction member 63 located at a higher position, it is preferable that both of them work with good balance.

  The back sheet 81 and the front sheet 82 are the same liquid impermeable material as the liquid impermeable sheet 11, the liquid permeable material similar to the top sheet 30 and the intermediate sheet 40, or the same as the exterior sheet 12 and the gather sheet 62. It can be formed of a material.

  The front side sheet 82 can fix the elastic elastic member 83 for expansion on one side of the front and back sides, but in order to fix it more firmly, it comprises a front side first layer 82A and a front side second layer 82B as shown in the figure. It is desirable to use a two-layer structure, and to fix the adhesive by sandwiching the elastic member 83 for expansion between the layers 82A and 82B.

  In the illustrated embodiment, a large number of vent holes 86 are perforated at predetermined intervals in the vertical direction in the portion of the front sheet 82 that becomes the side walls of the cells 85. However, the vent holes 86 may be omitted. However, when such a ventilation hole 86 is provided, the cell 85 repeatedly expands and contracts due to the movement of the wearer sitting, standing, and walking, and the air inside and outside of the cell 85 enters and exits, and the inside of the absorbent body 56 through the cell 85 is contained. Air circulation is promoted, and as a result, moisture easily escapes from the absorber 56. Even if a non-woven fabric having air permeability is used as the front sheet 82, the ventilation effect is remarkably improved by drilling the air holes 86 larger than the fiber gap. Although the dimension of a vent hole can be determined suitably, it is preferable that a diameter is about 0.2-3.0 mm normally.

  As can be seen from FIG. 9, the region where the cells 85 are continuous in the vertical direction is warped so that both the front and rear sides are lifted by the contraction of the expansion elastic member 83. Therefore, as shown in FIG. 6, in the form in which the cells 85 are continuous over the entire longitudinal direction, the crotch portion is bent so as to be the lowest in the mounted state, and the movable superabsorbent polymer particles 54 move toward the crotch portion. Will move. Therefore, as shown in FIG. 7, the bottom portion on the back side sheet 81 side of each side of the front side sheet 82 is joined to the back side sheet 81 at a position spaced by a cell 85 minutes in the vertical direction to form a non-inflatable portion 87. In addition, it is also proposed that a plurality of cells 85 separated by the non-expandable portion 87 are arranged in the vertical direction. The interval in the width direction of the non-expanded portion 87 is preferably about 10 to 40 mm, and is preferably the same as the interval in the width direction of the joint portion 84. The shape of the non-expandable portion 87 can be an appropriate shape such as a dotted line as well as a straight line. In this form, as shown in FIG. 11, a plurality of warped portions (portions of each cell 85) are formed, and each warp comes to exhibit a function of inhibiting the vertical movement of the superabsorbent polymer particles 54, The effect of preventing the uneven distribution of the superabsorbent polymer particles 54 in the longitudinal direction is further enhanced. In the form having the non-expandable portion 87, as shown in FIG. 12, in order to promote the expansion of the cell 85 portion, not only the elastic elastic member 83 for expansion along the vertical direction but also the lateral direction (width direction). It is also preferable to provide an auxiliary elastic elastic member 88 extending along the line.

<Other forms>
(A) As shown in FIG. 13 (a), the absorbent body 56 is a preferred form provided between the front sheet 82. In the illustrated example, the absorbent body 56 is only provided between the front sheet 82, but a separate absorbent body 56 may be provided on the absorbent body 56, or a part of the integral absorbent body 56 may be provided. It may be configured to bite between the front sheet 82. As described above, when a part or all of the absorbent body 56 is provided in advance between the ridges of the front sheet 82 that is the holding gap of the superabsorbent polymer particles 54, the uneven distribution effect of the superabsorbent polymer particles 54 is prevented. Will be even more.
(B) As shown in FIG. 13B, when the superabsorbent polymer particles 54 s are included in the cell 85 in addition to the superabsorbent polymer particles 54 included in the absorber 56, Since it can utilize as a liquid absorption holding space, it is preferable. In this case, at least the front sheet 82 is a liquid-permeable sheet similar to the top sheet 30, the intermediate sheet 40, and the like.

  INDUSTRIAL APPLICABILITY The present invention can be used for absorbent articles in general, such as pants-type disposable diapers as described above, tape-type and pad-type disposable diapers, and sanitary napkins.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior sheet, 12r ... Folded part, 25 ... Printing sheet, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 52 ... Filament aggregate, 54 ... Super absorbent polymer Particles 56. Absorber 57. Convex forming sheet 58. Packaging sheet 60 Solid gathering 62 Gather sheet 200 Interior body 80 Retaining layer 81 Back sheet 82 Front sheet 83 An elastic elastic member for expansion, 84, a joint portion, 85, a cell, 86, a vent, 87, a non-inflatable portion, and 88, an elastic elastic member for auxiliary use.

Claims (5)

A liquid-permeable top sheet, a liquid-impervious sheet, and an absorbent element provided between the top sheet and the liquid-impervious sheet,
The absorbent element has an absorbent body in which the superabsorbent polymer particles are movably held in the filament aggregate and a portion located on the back side of the absorbent body, and the superabsorbent polymer particles that have escaped from the absorbent body And a holding layer for holding
The holding layer includes a back sheet disposed on the back side, a front sheet disposed on the front side of the back sheet, and a plurality of wrinkles extending in the longitudinal direction arranged in parallel in the width direction, and absorption of wrinkles on the front sheet which has a elongate inflation elastically stretchable member secured under tension along the longitudinal direction in the side portion, said back side sheet and the back side sheet side bottom you located on both sides in the width direction of the folds of the face sheet Are joined to form a joined portion, and between these joined portions, the back side sheet and the front side sheet are not joined, and a cylindrical cell along the longitudinal direction is formed,
The expansion and contraction of the elastic elastic member for expansion causes the cell to bulge so that it can be deformed and restored while curving so that both front and rear sides of the cell are lifted, The superabsorbent polymer particles that escape from the absorbent body are held between the front sheet sheets,
An absorbent article characterized by the above.   The absorptive article according to claim 1 in which a vent is perforated in a portion used as a side wall of said cell in said front side sheet.   The absorptive article according to claim 1 or 2 with which a part or all of said absorber is provided between the ridges of said front side sheet.   The said front sheet | seat is a liquid-permeable sheet, The superabsorbent polymer particle is included in the said cell separately from the superabsorbent polymer particle contained in the said absorber, The any one of Claims 1-3 Absorbent article according to item. The backsheet side bottom you located on both sides in the width direction of the folds of the front sheet, non-inflatable portion is joined to the backsheet longitudinally spaced are formed, a plurality of separated by the non-inflatable portion The absorbent article according to any one of claims 1 to 4, wherein the cells are juxtaposed in the vertical direction.