JP6209240B2 - Absorbent articles - Google Patents

Description

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

  The absorbent article includes an absorbent body and a liquid-permeable top sheet that covers the front side of the absorbent body, and excreted liquid such as urine and menstrual blood passes through the top sheet and is absorbed and held by the absorbent body. It has become so. As the absorbent body, a mixture of highly absorbent polymer particles (SAP) mixed with hydrophilic short fibers such as pulverized pulp and piled up in a cotton form is widely adopted, while ensuring a sufficient absorbable amount, As a response to requests for further thinning, weight reduction, low cost, etc., a large number of cells (small chambers) surrounded by the joint portion of the front side sheet and the back side sheet and the front side sheet and the back side sheet are not joined, Various types of absorbers (hereinafter also referred to as cell absorbers) having high-absorbent polymer particles contained in the cells have been proposed (see, for example, Patent Documents 1 to 8 below).

  In these cell absorbers, if the volume at the time of saturated absorption of the superabsorbent polymer particles in the cell is sufficiently larger than the volume of each cell, the superabsorbent polymer particles are filled in the cell at the time of absorption, and expansion inhibition and When the so-called gel blocking may reduce the absorption amount / absorption rate, the cell may become hard due to the expansion pressure of the superabsorbent polymer particles, and the wearing feeling may be deteriorated, or when the front side sheet and the back side sheet are formed of nonwoven fabric May cause the superabsorbent polymer particles to leak out from the fiber gaps. For this reason, in the cell absorber, the joint part of the front side sheet and the back side sheet is peeled off at the time of absorption, and the cell volume is increased by combining adjacent cells (for example, see Patent Documents 1 to 5 below). ).

  However, cell absorbers have a slower absorption rate than conventional absorbers using pulp, and there is less space for receiving excretory fluids instantaneously. Therefore, excrement fluids easily move on the top sheet, causing so-called side leakage. There was a problem that it was easy. In particular, this problem becomes obvious when a large amount of absorption is necessary or when multiple absorptions are necessary, such as urine absorption of disposable diapers.

JP 2009-061230 Japanese Translation of National Publication No. 09-504207 Special table 2014-500736 gazette Noto 03172565 JP 2011-189067 A JP 09-327479 A JP 10-137291 A JP 2003-265525 A

  Therefore, a main problem of the present invention is to prevent side leakage while using a cell absorber.

  The typical embodiments of the present invention that have solved the above problems are as follows.

<First aspect>
Included in this cell are a front side sheet, a back side sheet arranged on the back side, a large number of cells surrounded by a joint between the front side sheet and the back side sheet, and the front side sheet and the back side sheet are not joined. In an absorbent article comprising an absorbent body having a powder comprising superabsorbent polymer particles;
The joint includes a weak joint that can be peeled off due to the expansion force of the superabsorbent polymer particles in the adjacent cells, and a strong joint that does not peel off due to the expansion force of the superabsorbent polymer particles in the adjacent cells.
Cells that are adjacent via the weak junction can be merged by peeling off the weak junction, and can be expanded to a larger single cell,
At least in the intermediate part in the width direction of the crotch part, the joint parts are provided in a uniform pattern, and the number of the weak joint parts occupying the joint part as it goes from the center part in the width direction of the absorber to both sides in the width direction The ratio increases stepwise or continuously,
An absorbent article characterized by the above.

(Function and effect)
In the present invention, when absorbing the excretory fluid, the weakly bonded portion peels off due to the expansion of the superabsorbent polymer particles, but the strong bonded portion does not peel off. The size and height of the merged cell are limited by the strong joint. Therefore, when the joint portion is provided in a uniform pattern, the portion with the higher numerical ratio of the weak joint portion (in this case, synonymous with the lower numerical ratio of the strong joint portion), coalesces when absorbing excretory fluid The cell will be bigger and higher. The present invention utilizes this, and when absorbing excretory fluid, a larger and higher united cell is formed toward both sides of the absorbent body in the width direction, and the combined cell blocks the urine that moves in the width direction. It becomes a body and side leakage is prevented. In addition, the absorption expansion of the superabsorbent polymer particles proceeds sequentially from the widthwise center of the absorbent body toward both sides of the widthwise direction, and a blocking body is formed in order from the widthwise center side, so that excretory fluid diffuses in the front-rear direction. This also has the advantage that the entire absorber can be used efficiently.

<Second aspect>
At least in the middle in the width direction of the crotch,
The joint is provided along a pattern in which polygons are arranged without gaps,
The cell has a polygon surrounded by a polygonal portion of the joint, and the side closest to the width direction among the sides where the joint in the cell is located, It is not connected linearly to the side closest to the width direction in the adjacent cell,
The absorbent article of a 1st aspect.

(Function and effect)
When joints are provided along a pattern in which polygons are arranged without gaps, the excretion fluid easily flows along the pattern of the joints. Therefore, the joint pattern is long and straight in the width direction as described above. By using a pattern that is not connected, the side leakage prevention property is further improved.

<Third Aspect>
At least in the intermediate part in the width direction of the crotch part, the content per unit area of the superabsorbent polymer particles increases stepwise or continuously from the central part in the width direction of the absorbent body toward both sides in the width direction. ,
The absorbent article of the 1st or 2nd aspect.

(Function and effect)
As the content per unit area of the superabsorbent polymer particles increases as it goes from the front and rear ends of the absorber toward the center in the front-rear direction, it increases toward the both sides in the width direction of the absorber when absorbing excretory fluid, This is particularly preferable because it makes it easy to form a united cell that is highly raised.

<Fourth aspect>
At least in the middle part in the width direction of the crotch part, the largest enlarged section consisting of a set of a plurality of cells or a single cell surrounded by the strong joints and having only weak joints located between the cells. However, they are arranged in the front-rear direction and the width direction, and the most enlarged sections are longer in the front-rear direction length on both sides in the width direction of the absorber.
The absorbent article according to any one of the first to third aspects.

(Function and effect)
In the fourth aspect, even when the weakly bonded portion is peeled off due to the expansion of the superabsorbent polymer particles and the cells are united at the time of absorbing the excretory fluid, the cell does not become larger than the most enlarged section. Therefore, at least at the crotch portion of the absorbent body, when the largest expansion section is provided so that the length in the front-rear direction is longer at the both sides in the width direction, the larger the volume increases toward the both sides in the width direction of the absorbent body when absorbing excretory fluid A combined cell is formed, and the combined cell becomes a blocking body that blocks urine moving in the width direction, thereby preventing side leakage.
Further, in the second aspect, when excreted liquid is absorbed, the gelled product of the expanded superabsorbent polymer particles cannot move out of the most enlarged section. Therefore, the gelled superabsorbent polymer particles are absorbed by the longitudinal movement. There is also an advantage that the shape of the body can be effectively prevented from collapsing.

<Fifth aspect>
At least in the middle in the width direction of the crotch,
The joint portion is provided along a pattern in which polygons having opposite sides along the width direction are arranged without gaps,
The cell has a polygon surrounded by a polygonal portion of the joint, and in the most enlarged section composed of a set of the plurality of cells, the side of the cell where the joint is located Among them, the weak joint is provided only at the position of the side parallel to the width direction,
The absorbent article of a 4th aspect.

(Function and effect)
In the fifth aspect, since the cells do not merge in the width direction, but merge only in the front-rear direction and a long blocking body is formed in the front-rear direction, the diffusibility in the front-rear direction is improved, and more lateral leakage prevention It will be excellent.

<Sixth aspect>
The cells on both sides in the middle of the absorbent body in the front-rear direction are empty cells with less inclusion amount per unit area of the superabsorbent polymer particles than other cells,
In the region located between the empty cells on both sides, the joint is provided in a uniform pattern, and the weak joint occupies the joint as it goes from the center in the width direction to both sides in the width direction. The numerical ratio of increases stepwise or continuously,
The absorbent article according to any one of the first to fifth aspects.

(Function and effect)
For example, in an absorbent body in which superabsorbent polymer particles are mixed with hydrophilic short fibers such as pulverized pulp and piled up in a cotton shape, the middle part in the front-rear direction is formed in a shape narrowed in the width direction along the leg circumference. However, in cell absorbers as well, by making the cells on both sides in the width direction in the middle of the front-rear direction empty cells, the portions become less expanded after absorption. Also, the absorber is shaped to fit around the legs.
In addition, “the amount of inclusion per unit area of the superabsorbent polymer particles being small” includes not encapsulating the superabsorbent polymer particles (hereinafter the same).
However, simply providing such empty cells inevitably causes side leakage. On the other hand, as described above, in the region located between the empty cells on both sides, the junction is provided in a uniform pattern, and the junction is performed from the center in the width direction of the region toward both sides in the width direction. If the numerical ratio of weak joints occupying the part increases stepwise or continuously, empty cells on both sides are less swelled and easily fit around the legs when absorbing excretory fluids. In the region located between the two cells, a united cell that is larger and higher as it goes to both sides in the width direction is formed, and this united cell becomes a blocking body that blocks urine moving in the width direction, which is preferable because side leakage is prevented. .

  According to the present invention, there are advantages such as excellent side leakage prevention while using a cell absorber.

It is a top view in the state where the diaper was developed showing the inner surface of a tape type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a tape type disposable diaper. FIG. 6 is a sectional view taken along line 6-6 in FIG. It is 7-7 sectional drawing of FIG. (A) 8-8 sectional drawing of FIG. 1, (b) 9-9 sectional drawing of FIG. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. (A) The principal part fracture | rupture top view of an absorber, (b) It is the 1-1 sectional drawing. It is a top view of the absorber which showed the joined part simply. It is a top view of the absorber which showed the joined part simply. FIG. 10 is a sectional view taken along the line 2-2 in FIGS. 8 and 9. It is a top view of the absorber which showed the joined part simply. It is a top view of the absorber which showed the joined part simply. It is a top view of the absorber which showed the joined part simply. It is a top view of the absorber which showed the joined part simply. It is 4-4 sectional drawing of FIG. It is a schematic plan view which shows the example of various arrangement | positioning of a cell.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
<Examples of absorbent articles>
1-6 has shown an example of the tape type disposable diaper, the code | symbol X in a figure has shown the full width of the diaper except a fastening tape, and the code | symbol L has shown the full length of the diaper. Each component is fixed or bonded in the same manner as a known diaper, if necessary, other than the fixed or bonded portion described below. As means for fixing or joining these, a hot melt adhesive or welding (heat welding, ultrasonic welding) can be appropriately selected.

  This tape-type disposable diaper has a basic structure in which an absorbent body 50 is interposed between a liquid-permeable top sheet and a liquid-impermeable sheet located on the outer surface side. Each of which has a ventral end flap portion EF and a dorsal end flap portion EF, which are portions extending to the side and not having the absorber 50, and extend laterally from the side edge of the absorber 50. It has a pair of side flap portions SF to be taken out. Fastening tapes 13 are respectively provided on the side flap portions SF in the back portion B, and when attaching the diaper, the side flap portion SF of the back portion B is overlapped on the outside of the side flap portion SF of the ventral portion F. In this state, the fastening tape 13 is locked at an appropriate position on the outer surface of the ventral portion F.

  Moreover, in this tape type disposable diaper, the whole outer surface of the absorptive main-body part 10 and each side flap part SF is formed of the exterior sheet 12. FIG. In particular, in the region including the absorber 50, the liquid-impermeable sheet 11 is fixed to the inner surface side of the exterior sheet 12 with an adhesive such as a hot melt adhesive, and further absorbed to the inner surface side of the liquid-impermeable sheet 11. The body 50, the intermediate sheet 40, and the top sheet 30 are laminated in this order. The top sheet 30 and the liquid-impermeable sheet 11 are rectangular in the illustrated example, have slightly larger dimensions in the front-rear direction LD and the width direction WD than the absorbent body 50, and the side edges of the absorbent body 50 in the top sheet 30. The peripheral edge that protrudes further from the peripheral edge that protrudes from the side edge of the absorbent body 50 in the liquid-impermeable sheet 11 is joined by a hot melt adhesive or the like. The liquid-impermeable sheet 11 is formed to be slightly wider than the top sheet 30.

  Further, on both sides of the absorbent main body 10, there are provided side solid gathers 60 that protrude (stand up) toward the wearer's skin, and the gather sheets 62 that form the side solid gathers 60 are tops. The sheet 30 is fixed in a range from both side portions of the sheet 30 to the inner surface of each side flap portion SF.

Hereinafter, details of each unit will be described in order.
(Exterior sheet)
The exterior sheet 12 is a sheet constituting the outer surface of the product. The exterior sheet 12 has a shape in which the center part of the front-rear direction LD on both sides is constricted, and this is a part that surrounds the wearer's leg. The exterior sheet 12 is preferably a non-woven fabric, but is not limited thereto. The type of the nonwoven fabric is not particularly limited, and as the material fiber, for example, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, recycled fibers such as rayon or cupra, and natural fibers such as cotton are used. As a processing method, a spunlace method, a spunbond method, a thermal bond method, an air-through method, a needle punch method, or the like can be used. However, a long-fiber nonwoven fabric such as a spunbond nonwoven fabric, an SMS nonwoven fabric, or an SMMS nonwoven fabric is preferable in that both the touch and strength can be achieved. In addition to using a single nonwoven fabric, a plurality of nonwoven fabrics can be used. In the latter case, the nonwoven fabrics are preferably bonded to each other with a hot melt adhesive or the like. When using a nonwoven fabric, the fabric weight is preferably 10 to 50 g / m ² , particularly 15 to 30 g / m ² . The exterior sheet 12 can be omitted, and in that case, the liquid-impermeable sheet 11 can have the same shape as the exterior sheet 12 to constitute the outer surface of the product.

(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, liquid impervious sheets are composed of waterproof films and non-woven fabrics). 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 leakage resistance by reducing the voids of the fiber by applying heat or pressure, and applying water-repellent resin or hydrophobic resin or water repellent to waterproof A sheet that is liquid-impermeable without using a film can also be used as the liquid-impermeable sheet 11.

(Top sheet)
The top sheet 30 may be a porous or non-porous nonwoven fabric having liquid permeability. What is the constituent fiber of the nonwoven fabric is not particularly limited. 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, the spun lace method is a preferable processing method for obtaining flexibility and drapeability, and the thermal bond method is for obtaining bulkiness and softness.

(Intermediate sheet)
The intermediate sheet 40 is joined to the back surface of the top sheet 30 in order to quickly move the excreted liquid that has passed through the top sheet 30 to the absorber 50 side and to prevent reversal. For joining the intermediate sheet 40 and the top sheet 30, heat embossing or ultrasonic welding can be used in addition to using a hot melt adhesive. As the intermediate sheet 40, a non-woven fabric can be used, and a resin film having a large number of transmission holes can also be used. As the non-woven fabric, the same material as that described in the section of the top sheet 30 can be used. However, a material having higher hydrophilicity than the top sheet 30 and a material having a higher fiber density are changed from the top sheet 30 to the intermediate sheet 40. This is preferable because of its excellent liquid transfer characteristics.

  The intermediate sheet 40 in the form shown in the figure is disposed in the center shorter than the width of the absorber 50, but may be provided over the entire width. The length of the intermediate sheet 40 in the front-rear direction LD may be the same as the entire length of the diaper, may be the same as the length of the absorbent body 50, or may be within a short length range centered on the region that receives the liquid. .

(Side three-dimensional gather)
In order to prevent lateral movement of excrement on the top sheet 30 and prevent lateral leakage, it is preferable to provide a side solid gather 60 that protrudes (stands up) from the inner surfaces on both sides of the product in the width direction WD.

  The side three-dimensional gather 60 includes a gather sheet 62 and an elongated elastic elastic member 63 fixed to the gather sheet 62 in an extended state along the front-rear direction LD. As the gather sheet 62, a water-repellent nonwoven fabric can be used, and as the elastic elastic member 63, rubber thread or the like can be used. As shown in FIGS. 1 and 3, a plurality of elastic elastic members can be provided in addition to a plurality of elastic expansion members.

  The inner surface of the gather sheet 62 has a fixing start end in the width direction WD on the side portion of the top sheet 30, and a portion outside the fixing start end in the width direction WD includes the side portion of the liquid-impermeable sheet 11 and the portion concerned. Is fixed to a side portion of the exterior sheet 12 located at a position by a hot melt adhesive or the like.

  Around the leg, the inner side in the width direction WD from the fixing start end of the side three-dimensional gather 60 is fixed on the top sheet 30 at both ends in the product longitudinal direction LD, but the portion in between is an unfixed free part. Yes, this free part comes to stand by the contraction force of the elastic elastic member 63. When the diaper is mounted, the diaper is mounted on the body in the shape of a boat, and since the contraction force of the elastic expansion / contraction member 63 acts, the side three-dimensional gather 60 stands up by the contraction force of the elastic expansion / contraction member 63 and around the leg. In close contact. As a result, so-called side leakage from around the legs is prevented.

  Unlike the illustrated embodiment, both ends of the front-rear direction LD in the inner portion of the gather sheet 62 in the width direction WD are connected to a base end side portion extending inward from an outer portion of the width direction WD, and the base end side portion. Fix in a folded state having a tip side portion that is folded back from the edge on the center side in the width direction WD to the body side and extends to the outside in the width direction WD, and the portion in between is an unfixed free portion You can also.

(Plane gathering)
As shown in FIGS. 1 to 3, each side flap portion SF has a gap between the gather sheet 62 and the liquid-impermeable sheet 11 on the outer side in the width direction WD in the vicinity of the sticking start end among the sticking portions of the gather sheet 62. Further, a leg elastic member 64 made of rubber thread or the like is fixed in a state of being stretched along the front-rear direction LD, whereby the leg peripheral portion of each side flap portion SF is configured as a planar gather. The leg elastic member 64 may be disposed between the liquid-impermeable sheet 11 and the exterior sheet 12 in the side flap portion SF. In addition to providing a plurality of leg elastic members 64 on each side as shown in the drawing, only one elastic member 64 can be provided on each side.

(Fastening tape)
1, 2, and 6, the fastening tape 13 is a sheet base material that forms a tape attachment portion 13 </ b> C fixed to a side portion of the diaper and a tape main body portion 13 </ b> B protruding from the tape attachment portion 13 </ b> C. And a locking portion 13A for the ventral side provided in the intermediate portion in the width direction WD of the tape main body portion 13B in the sheet base material, and the tip side of the locking portion 13A is a knob. is there. The tape attachment portion 13C of the fastening tape 13 is sandwiched between the gather sheet 62 forming the inner layer and the exterior sheet 12 forming the outer layer in the side flap portion, and is bonded to both the sheets 62 and 12 by a hot melt adhesive. . Moreover, 13 A of latching parts are joined to the sheet | seat base material with the adhesive agent so that peeling is impossible.

  As the locking portion 13A, a hook material (male material) of a mechanical fastener (surface fastener) is suitable. The hook material has a large number of engaging projections on the outer surface side thereof. As the shape of the engagement protrusion, there are a letter shape, a J shape, a mushroom shape, a T shape, a double J shape (a shape in which a J shape is combined back to back), etc. The shape may also be Of course, an adhesive layer can also be provided as a locking portion of the fastening tape 13.

  Moreover, as a sheet base material that forms from the tape attachment part to the tape body part, in addition to various nonwoven fabrics such as spunbond nonwoven fabric, air-through nonwoven fabric, and spunlace nonwoven fabric, plastic film, polylaminated nonwoven fabric, paper, and composite materials thereof are used. be able to.

(Target sheet)
It is preferable to provide a target sheet 12T having a target for facilitating the locking at the locking portion of the fastening tape 13 in the ventral portion F. As the target sheet 12T, when the hook portion is the hook material 13A, a target sheet 12T can be used in which a large number of loop yarns are formed on the surface of a sheet base material made of a plastic film or nonwoven fabric so that the hook material engagement protrusions are entangled. In the case of an adhesive material layer, a sheet base material made of a plastic film having a smooth surface that is rich in adhesiveness can be used. Further, when the fastening portion of the fastening tape 13 in the ventral portion F is made of a non-woven fabric, for example, when the exterior sheet 12 of the illustrated form is made of a non-woven fabric and the fastening portion of the fastening tape 13 is the hook material 13A. Can omit the target sheet 12T and entangle the hook material 13A with the nonwoven fabric of the exterior sheet 12 to be locked. In this case, the target sheet 12T may be provided between the exterior sheet 12 and the liquid-impermeable sheet 11.

(Absorber)
The absorber 50 is a part that absorbs and holds the liquid content of excrement. The absorber 50 can be bonded to at least one of the front and back members via an adhesive such as a hot melt adhesive.

As shown in an enlarged view in FIG. 7, the absorbent body 50 is surrounded by the front side sheet 51, the back side sheet 52 disposed on the back side thereof, and the joint portion 54 of the front side sheet 51 and the back side sheet 52, and the front side The cell absorbent body 50 includes a cell (small chamber) 55 to which the sheet 51 and the back sheet 52 are not joined, and the superabsorbent polymer particles 53 contained in the cell 55. By distributing and holding the superabsorbent polymer particles 53 in a large number of cells 55 surrounded by the whole, the uneven distribution of the superabsorbent polymer particles 53 in the absorbent body 50 can be prevented. The cell absorber 50 can be packaged with a packaging sheet (not shown). In this case, one wrapping sheet can be wrapped in a cylindrical shape so as to surround the front and back surfaces and both side surfaces of the absorbent body 50, and can be packaged so as to be sandwiched by two wrapping sheets from both the front and back surfaces. As the packaging sheet, 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 for the packaging sheet, 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 . When the cell absorbent body 50 is packaged with a packaging sheet, pulp fibers can be stacked on either the front or back side of the cell absorbent body, and these can be packaged together with the packaging sheet.

  The front side sheet 51 may be a liquid-permeable material or a liquid-impermeable material, but is preferably a liquid-permeable material when positioned on the top sheet 30 side as shown in the figure. . For the front side sheet 51, a porous or non-porous nonwoven fabric or a porous plastic sheet can be used in the same manner as the top sheet 30. When using a non-woven fabric for the front sheet 51, the constituent fibers include, for example, synthetic fibers (including single component fibers as well as composite fibers) such as olefins, polyesters, and polyamides such as polyethylene or polypropylene, rayon, Recycled fibers such as cupra, natural fibers such as cotton, and the like can be selected without particular limitation, but thermoplastic resin fibers are preferred in terms of excellent thermal processability. The fiber bonding method of the nonwoven fabric is not particularly limited, but a bonding method that increases the fiber density, such as a spunbond method, a melt blown method, and a needle punch method, is preferable in order to prevent the superabsorbent polymer particles 53 from falling off. In the case of using a porous plastic sheet, the opening diameter is preferably smaller than the outer shape of the superabsorbent polymer particles 53 in order to prevent the superabsorbent polymer particles 53 from falling off. Further, when the material of the front side sheet 51 is hydrophobic, a hydrophilic agent can be contained.

  In order to facilitate the arrangement of the superabsorbent polymer particles 53 at the time of production and to secure the volume after absorption and expansion, a recess 51c that is recessed from the back side to the front side is formed in a portion constituting each cell 55 in the front side sheet 51. Is preferably formed, but may not be formed.

  The back side sheet 52 can be made of the same material as the front side sheet 51, but when the front side sheet 51 is made of a liquid permeable material, a liquid impermeable material can also be adopted for the back side sheet 52. . The liquid impermeable material that can be used for the back sheet 52 can be appropriately selected from the materials described in the section of the liquid impermeable sheet 11. Although not shown, the front side sheet 51 and the back side sheet 52 can be one layer in which one material is folded in two and the other layer.

  The superabsorbent polymer particles 53 are not fixed to the front side sheet 51 and the back side sheet 52 and can be freely moved, or can be adhered or adhered to the front side sheet 51 and the back side sheet 52. Further, the superabsorbent polymer particles 53 may be agglomerated to some extent.

  As the superabsorbent polymer particles 53, those used in this type of absorbent article can be used as they are. The particle size of the superabsorbent polymer particles is not particularly limited, but for example, screening using a standard sieve (JIS Z8801-1: 2006) of 500 μm (shaking for 5 minutes), and particles falling under the screen by this screening When sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006), the proportion of particles remaining on the 500 μm standard sieve is 30% by weight or less, and the 180 μm standard sieve It is desirable that the proportion of particles remaining on the surface is 60% by weight or more.

  The material of the superabsorbent polymer particles 53 can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. Examples of the superabsorbent polymer particles 53 include starch-based, cellulose-based and synthetic polymer-based ones 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. As the shape of the superabsorbent polymer particles 53, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent polymer particles 53, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption rate is too slow, the liquid supplied into the absorbent body 50 tends to cause so-called reversal that returns to the outside of the absorbent body 50.

  Moreover, as the superabsorbent polymer particles 53, 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 50, the sticky feeling after liquid absorption can be suppressed effectively.

The basis weight of the superabsorbent polymer particles 53 can be appropriately determined according to the amount of absorption required for the application of the absorber 50. 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.

  The planar shape of the cell 55 can be determined as appropriate, and can be hexagonal, rhombus, square, rectangular, circular, elliptical, etc., as shown in FIGS. In order to achieve the arrangement, it is desirable to use polygons, and it is desirable to arrange them without gaps as illustrated. 8 employs a honeycomb-like arrangement of regular hexagonal cells 55, and the form shown in FIG. 11 employs a staggered arrangement of square cells 55. The cells 55 may be arranged by combining a plurality of types of cells 55 having at least one of shape and size in addition to arranging the same shape and size. In addition, the term “regular hexagon” includes those in which the front side sheet 51 and the back side sheet 52 are stretched and deformed to ± 5% in the front-rear direction LD due to the influence of expansion and contraction during manufacturing.

  The planar arrangement of the cells 55 (that is, the gathering part of the superabsorbent polymer particles 53 is also the same) can be determined as appropriate. However, a regularly repeated planar arrangement is preferable, and an oblique lattice shape as shown in FIG. Or a hexagonal lattice shape (also referred to as a staggered shape) as shown in FIG. 16B, a square lattice shape as shown in FIG. 16C, a rectangular lattice shape as shown in FIG. 16 (e) as shown in FIG. 16 (e) (a configuration in which two groups are provided so that a large number of groups in an oblique direction intersect each other), etc. In addition to those that are repeated regularly (including those that are inclined at an angle less than degrees), the group of cells 55 (group unit arrangement may be regular or irregular, pattern or character, etc.) is regular It can also be repeated.

The dimension of each cell 55 can be determined as appropriate. For example, the length 55L in the front-rear direction LD can be about 8 to 30 mm, and the length 55W in the width direction WD can be about 10 to 50 mm. The area of each cell 55 can be about 65 to 1650 mm ² .

  The joining portion 54 for joining the front side sheet 51 and the back side sheet 52 is preferably joined by welding the front side sheet 51 and the back side sheet 52 like ultrasonic welding or heat sealing, but via a hot melt adhesive. It may be joined.

  The joint portion 54 of the front side sheet 51 and the back side sheet 52 is arranged so as to surround each cell 55, and as long as it becomes a boundary between adjacent cells, it is a dotted line shape as shown in the figure (intermittently in the direction surrounding each cell 55. ), Or a continuous line shape. When the joint portions 54 are formed intermittently, the superabsorbent polymer particles 53 are not present between the joint portions 54 in the direction surrounding the cells 55, or even if they are present, the number of the superabsorbent polymer particles 53 is less than that in the cells 55. .

  As shown in FIG. 10, the bonding portion 54 includes a weak bonding portion 54 b that can be peeled off by the expansion force of the superabsorbent polymer particles 53 in the adjacent cells 55, and the superabsorbent polymer particles 53 in the adjacent cells 55. And a strong joint 54a that does not peel off due to the expansion force. The cells 55 that are adjacent to each other across the weakly bonded portion 54 b are separated by the absorption expansion pressure of the superabsorbent polymer particles 53 in the cell 55 and merged to expand into one large cell 55. On the other hand, the strong joint portion 54a is a portion that does not peel even if the cells 55 on both sides thereof absorb and expand, and thus functions to limit the size and height of the combined cell 55.

  Moreover, the joining part 54 improves diffusibility by continuing in a specific direction, prevents the flow of the gelled product of the superabsorbent polymer particles 53, reduces the contact area on the surface side, etc. The effect has an effect, and the effect continues in the portion where the strong joint 54a continues. For this reason, if the pattern of the joint portion 54 extends linearly in the width direction, there is a risk of promoting side leakage. Therefore, when the joining portion is provided along the pattern in which the polygons are arranged without gaps as in the illustrated embodiment, the sides that are closest to the width direction are adjacent to the sides where the joining portions in the cell are located. It is preferable to provide a joint portion in a pattern that does not connect linearly to the side that is closest to the width direction in the cell, since it has excellent lateral leakage prevention properties.

  8, 9, and 12 to 14, the strong joint portion 54 a is represented by a thick dotted line, and the weak joint portion 54 b is represented by a thin dotted line.

  The bonding portion 54 located on the outermost side in the width direction WD is preferably a strong bonding portion 54a because if it peels off, the superabsorbent polymer particles 53 or the gelled product thereof may leak to the side of the absorber 50. . From the same viewpoint, the front side sheet 51 and the back side sheet 52 are extended to some extent outside the cell 55 formation region in the width direction WD, and the edge joint portion 54c is applied to the extended part for reinforcement. preferable.

  The difference in bonding strength may be easily formed by changing the area of the bonding portion 54, but is not limited to this. For example, when the bonding portion 54 is formed of a hot melt adhesive, the hot melt adhesive is used. It is also possible to adopt a method of making the type of the different depending on the part. In particular, when the joining portion 54 is formed by welding the front side sheet 51 and the back side sheet 52, the weak joining portion 54b can be formed only by widening the point interval 54D by making the joining portion 54 dotted. Since the portion 54 is a portion that becomes a boundary between the adjacent cells 55, if the point interval 54 </ b> D becomes too large, a gap increases at the boundary between the adjacent cells 55, and the superabsorbent polymer particles 53 easily move. Therefore, when the dotted line-shaped weakly bonded portion 54b is formed by combining the width of the line width 54W of the bonded portion 54 and the width of the point interval 54D, the weakly bonded portion 54b portion is easily peeled even though the gap is small. It becomes.

  The dimensions of the joint 54 that joins the front sheet 51 and the back sheet 52 can be determined as appropriate. For example, the line width (dimension in the direction perpendicular to the direction surrounding the cell 55) 54W is about 0.6 to 8.0 mm. be able to. In addition, when the joint portion 54 is formed in a dotted line shape (intermittently in the direction surrounding the cell 55), the length 54L of the joint portion 54 in the direction surrounding the cell 55 is about 0.6 to 8.0 mm, and the point interval 54D is The thickness is preferably about 0.8 to 10.0 mm. Particularly, in the case of the strong joint 54a, the line width 54W is about 1.0 to 4.0 mm, the length 54L of the joint 54 is about 1.5 to 4.0 mm, and the point interval 54D is 0.8 to 2. About 5 mm is preferable. In the case of the weak joint 54b, the line width 54W is about 0.6 to 3.5 mm, the length 54L of the joint 54 is about 0.6 to 2.5 mm, and the point interval 54D is 1.0 to 4. About 0.0 mm is preferable.

  In order to make the weakly bonded portion 54b peelable, the volume at the time of saturated absorption of the superabsorbent polymer particles 53 in the cell 55 is sufficiently larger than the volume of the cell 55 adjacent to the weakly bonded portion 54b. The type and amount of the superabsorbent polymer particles 53 disposed in each cell 55 can be determined. Further, in order not to peel off the strong joint portion 54a, the superabsorbent polymer particles 53 contained in the coalescable cell 55 rather than the volume after the coalescence of the cell 55 that can be coalesced by peeling off the weak joint portion 54b. The type and amount of the superabsorbent polymer particles 53 arranged in each cell 55 can be determined so that the volume at the time of saturated absorption is reduced.

  The width of the bonding portion 54 when the bonding portion 54 is formed in a continuous line shape, and the line width 54W when the bonding portion 54 is formed in a dotted line shape are fixed in the direction surrounding the cell 55, and may be changed. it can. In addition, the shape of each joint 54 in the case where the joint 54 is formed in a dotted line shape can be determined as appropriate, and all the shapes can be the same or different depending on the region. In particular, when the shape of each cell 55 is a polygon, it is preferable to provide a joint 54 at at least one of the intermediate position and the vertex position of each side. Further, in the case of the strong joint portion 54a, it is preferable to be provided at each vertex position. However, in the case of the weak joint portion 54b, the weak joint portion 54b is more easily peeled off when not provided at each vertex position, so that the cells 55 are combined. Is preferable because it proceeds smoothly. When the joint 54 is provided at each vertex position, the shape is preferably a radial (star) shape protruding in the direction of each side.

  Characteristically, as shown in FIGS. 8 and 11, the entire front-rear direction LD of the cell absorber 50 is a lateral leakage prevention region, and in this lateral leakage prevention region, the joint portion 54 has a uniform pattern. The largest expanded section comprising a set of a plurality of cells 55 or a single cell 55 in which the joint 54 located between the cells 55 is only the weak joint 54b and is surrounded by the strong joint 54a. 57 are arranged in the front-rear direction LD and the width direction WD, and in the most enlarged sections 57, the lengths in the front-rear direction 58 are longer on both sides of the absorbent body 50 in the width direction WD.

  As described above, when the excretory fluid is absorbed, the weakly bonded portion 54b is peeled off due to the expansion of the superabsorbent polymer particles 53, but the strong joined portion 54a is not peeled off. Will merge. For example, in the form shown in FIGS. 8 and 11, if it is assumed that urine is excreted at the position Z1, the urine diffuses around as shown in FIGS. Absorbent polymer particles 53 absorb. At this time, as shown also in FIG. 10, the cell 55 in which the expansion pressure of the internal superabsorbent polymer particles 53 is increased is peeled without being able to resist the expansion pressure, and the adjacent weak cell 54 b is peeled off. Combine with 55. This coalescence continues as long as the absorption expansion of the superabsorbent polymer particles 53 can peel the weakly bonded portion 54b, and can proceed to the cell 55 having the strong bonded portion 54a around it. That is, even if the weakly bonded portion 54 b is peeled off due to the expansion of the superabsorbent polymer particles 53 and the cells 55 are united, it does not become larger than the largest enlarged section 57. Therefore, when the most enlarged section 57 is provided so that the length in the front-rear direction 58 becomes longer as it is on both sides in the width direction WD in the side leakage prevention region, it is larger toward the both sides in the width direction WD of the absorber 50 when absorbing excretory fluid. A united cell 55 that rises high is formed, and the united cell 55 serves as a blocking body that blocks urine moving in the width direction WD, thereby preventing side leakage. 9 and 12 show a state in which only the weakly joined portion 54b in the region Z2 is peeled off and the cells are merged up to the most enlarged section 57. FIG. Further, during the absorption of excretory fluid, the absorption expansion of the superabsorbent polymer particles 53 proceeds sequentially from the widthwise WD central portion of the absorbent body 50 toward both sides of the widthwise WD, and a blocking body is formed in order from the widthwise WD central side. Therefore, the excretion fluid is easily diffused in the front-rear direction LD, and the advantage that the entire absorbent body 50 can be used efficiently and the gelled product of the expanded superabsorbent polymer particles 53 cannot move out of the largest expansion section 57. Therefore, there is also an advantage that the shape of the absorber 50 can be effectively prevented from collapsing due to the LD movement of the gelled superabsorbent polymer particles 53 in the front-rear direction.

  The maximum expansion section 57 in the side leakage prevention region includes both the maximum expansion section 57 composed of a single cell 55 and the maximum expansion section 57 composed of a set of a plurality of cells 55 that can be combined, as shown in the figure. Moreover, it is also possible to adopt a form that does not include the maximum expansion section 57 composed of a single cell 55 but includes only the maximum expansion section 57 composed of a set of a plurality of cells 55 that can be combined.

  As shown in FIG. 8, the most enlarged section 57 in the side leakage prevention region has a form in which the length in the width direction WD becomes longer as it extends on both sides of the absorbent body 50 in the width direction WD. As described above, the length in the width direction WD hardly changes depending on the position of the absorber 50 in the width direction WD. That is, in the absorbent body 50 shown in FIG. 8, the polygonal cells 55 having the same shape are arranged in a staggered pattern without any gaps, and the first width direction range W1 including the central portion in the width direction WD is the outermost cell composed of a single cell 55. Only the enlarged sections 57 are arranged in the front-rear direction LD and the width direction WD, and a second width direction range W2 adjacent to both sides of the width direction WD includes a set of cells 55 arranged in a plurality of directions (in the illustrated example, three cells 55). ) Are arranged in the front-rear direction LD, and the third width direction range W3 located on the outermost side in the width direction WD is larger in number than the maximum enlargement section 57 in the second width direction WD range ( In the illustrated example, 5 or 7 cells 55) are arranged in the front-rear direction LD, with the most enlarged sections 57 formed of a set of cells 55 arranged in a plurality of directions. Therefore, in the absorbent body 50 of the form shown in FIG. 8, when absorbing the excretory fluid, as shown in FIG. 9, it is longer in both the front-rear direction LD and the width direction WD toward the both sides of the width direction WD of the absorbent body 50, A united cell 55 that rises high is formed, and the united cell 55 serves as a blocking body that blocks urine moving in the width direction WD, thereby preventing side leakage.

  On the other hand, in the absorbent body 50 shown in FIG. 11, the cells 55 are arranged symmetrically with respect to the width direction WD center line, and rectangular cells 55 having the same shape are staggered on the left and right sides of the width direction WD center line. Are arranged without gaps. In the first width direction range W1 including the central portion in the width direction WD, only the most enlarged section 57 composed of a single cell 55 is arranged in the front-rear direction LD and the width direction WD, and the second range adjacent to both sides of the width direction WD. In the width direction range W2, the most enlarged section 57 composed of a set of cells 55 arranged in the front-rear direction LD (two cells 55 in the illustrated example) is aligned in the front-rear direction LD and the width direction WD, and is located on the outermost side in the width direction WD. In the third width direction range W3, the largest expansion composed of a set of cells 55 (three cells 55 in the illustrated example) in which a larger number of cells 55 than the largest expansion section 57 of the second width direction range W2 are arranged in the front-rear direction LD. The compartments 57 are arranged in the front-rear direction LD. In this case, in the most enlarged section 57 in the second width direction range W2 and the third width direction range W3, the weak junction 54b is provided only at the position of the side parallel to the width direction WD of the cell 55. And in the absorber 50 of the form shown in FIG. 11, at the time of absorption of excretory fluid, the merged cell 55 which is long and raised in the front-back direction LD is formed so that it goes to the width direction WD both sides of the absorber 50, and this merged cell 55 is formed. Becomes a blocking body that blocks urine moving in the width direction WD, and side leakage is prevented. However, in the absorbent body 50 shown in FIG. 11, the width direction WD length of the merged cell 55 is constant regardless of the width direction WD position of the absorbent body 50, unlike the absorbent body 50 shown in FIG. Since it becomes a long blocker, the diffusibility in the front-rear direction LD is improved, and the lateral leakage prevention property is further improved. In the absorber 50 shown in FIG. 11, the shape of the cell 55 is a rectangle. However, if the polygon is a polygon having opposite sides along the width direction WD, a blocking body that is long in the front-rear direction LD is also used other than the rectangle. Can be formed.

  The size, shape, and arrangement (that is, the arrangement of the strong joint portions 54a) of the most enlarged section 57 composed of a set of a plurality of cells can be determined as appropriate. For example, when the cell 55 is a regular hexagon as shown in FIG. 8, a portion connecting two continuous sides per cell 55 can be a linear portion at the periphery of the most enlarged section 57. The portion where three continuous sides per one cell 55 are connected can be a straight portion or a corner portion (direction changing portion) with an internal angle of 120 degrees, and four continuous portions per one cell 55 The part which connected the edge | side can become a direction change part of an internal angle of 60 degree | times or 180 degree | times. Therefore, by combining these linear portions and corner portions, the peripheral shape (arrangement of the strong joint portions 54a) of the most enlarged section 57 can be changed to a substantially triangular shape, a substantially rectangular shape, a substantially circular shape, a substantially trapezoidal shape, or a substantially trapezoidal shape. An appropriate shape such as a parallelogram shape can be used. In the form shown in FIG. 8, the most enlarged section 57 composed of a set of a plurality of cells has three or more cells arranged in two or more directions, and the peripheral shape is one cell 55 in the cell 55 along the periphery. It has a closed shape formed by connecting two to four continuous sides. As a result, the cells 55 are merged sequentially and are easily expanded smoothly to the maximum expansion section 57. The maximum expansion section 57 has a shape that easily expands and expands to the maximum expansion section 57. Increases the amount of increase.

  If the side leakage prevention region is provided at least in the middle part of the width direction WD of the crotch part in the absorbent body 50, even if it is provided in the entire width direction WD of the crotch part, the range in the front-rear direction is somewhat wider than the crotch part. In addition to the side leakage prevention area, the length of the front-rear direction LD of the maximum expansion section 57 does not change, or the maximum expansion section 57 is one or the maximum expansion section. There may be no 57. For example, on the basis of the arrangement of the joints 54 shown in FIG. 11, all of the joints 54 on the side closest to the width direction WD in one or more rows of cells 55 in the outermost row WD are weak. The joint 54b (there is no single largest enlargement section 57), or the joint 54 at the front and rear ends is a strong joint 54a, and all other parts are weak joints 54b (only one largest enlargement section 57). You can also

The content per unit area of the superabsorbent polymer particles 53 may be constant regardless of the change in the size of the largest expansion section 57. However, considering the side leakage prevention principle as described above, at least the side leakage prevention region is considered. Then, when increasing gradually or continuously from the central part of the absorbent body 50 in the width direction WD toward both sides of the width direction WD, the absorbent body 50 moves toward both sides of the absorbent body 50 in the width direction WD when absorbing excretory fluid. Since it becomes easy to form the unification cell 55 which is so large and raised up, it is preferable. The change in the content of the superabsorbent polymer particles 53 can be determined as appropriate. For example, the highest content portion is about 450 to 1000 g / m ² , and the lowest content portion is 1 / of the highest content portion. It can be about 2 to 1/10 times.

  On the other hand, as shown in FIGS. 13 and 14, it is also possible to provide empty cells 56 in which the amount of inclusion of the superabsorbent polymer particles 53 per unit area is smaller than that of other cells. In FIG. 13 and FIG. 14, a hatched pattern is given to the cell 55 containing the highly absorbent polymer particles 53 (that is, the cell excluding the low expansion cell 55 s and the empty cell 56 described later). The hatched area 53A assumes the shape of the dispersion area of the superabsorbent polymer particles 53 at the time of manufacture, and therefore there is a portion without a hatched pattern in the peripheral cells. When the superabsorbent polymer particles are movable, the position of the superabsorbent polymer particles in the cell is not fixed in the product. The inclusion amount of the superabsorbent polymer particles 53 in the empty cell 56 is preferably ½ or less, particularly 1/10 or less of the other cells, and particularly preferably not contained at all. For example, as shown in FIG. 13 and FIG. 14, the front end and the rear end of the absorbent body 50 are formed by cutting into individual absorbent bodies 50 at the time of manufacture. When it contains, there exists a possibility that the lifetime of the blade of a cutting device may become short. Therefore, it is desirable that the cell 55 at a position where at least the front and rear ends pass is an empty cell 56.

  Further, in the absorbent body 50 in which the superabsorbent polymer particles 53 are mixed with the hydrophilic short fibers such as pulverized pulp and the mixture is formed in a cotton shape, the middle part of the front-rear direction LD is narrowed in the width direction WD along the leg circumference. Although generally formed in a shape, as shown in FIG. 13, also in the cell absorber 50, the cells on both sides in the middle of the front-rear direction LD are made empty cells 56, so that the portions are absorbed. Therefore, even after absorption, the absorbent body 50 has a shape that fits around the legs. However, simply providing such empty cells 56 inevitably causes side leakage. Therefore, as shown in FIG. 13, in the region located between the empty cells 56 on both sides, the joint portions 54 are provided in a uniform pattern, and the width direction WD from the center of the region in the width direction WD. When the numerical ratio of the weak joints 54b occupying the joints 54 increases stepwise or continuously toward the both sides, the empty cells 56 on both sides are less expanded and fit around the legs when absorbing the excretory fluid. Although it is easy to do, a merged cell 55 that is larger and higher in the width direction WD is formed in the region located between them, and the merged cell 55 blocks urine that moves in the width direction WD. It is preferable because it becomes a blocking body that prevents lateral leakage.

  As shown in FIG. 14, one or a plurality of rows of cells 55 located at the center in the width direction WD can also be empty cells 56. Thereby, since the empty cell 56 has a smaller expansion amount than the cells 55 on both sides in the width direction WD, a groove extending in the front-rear direction LD is formed at the center of the width direction WD when absorbing excretory fluid, Liquid diffusion is promoted by the groove. The empty cell 56 at the center in the width direction WD may be provided over the entire length of the absorber 50. However, as shown in the figure, an intermediate portion in the front-rear direction LD (particularly, including the crotch portion and the range over both the front and rear sides). ) May be provided.

  When the cell absorber 50 is manufactured, it is difficult to accurately distribute a predetermined amount of the superabsorbent polymer particles 53 to the individual cells 55. Therefore, the superabsorbent polymer particles 53 on the front side sheet 51 or the back side sheet 52 are difficult to distribute. After the superabsorbent polymer particles 53 are uniformly dispersed over the entire containing region (the region excluding the portion that becomes the empty cell 56), the joint portion 54 is formed, and the front side sheet 51 and the back side sheet 52 are integrated. It is preferable to enclose the superabsorbent polymer particles 53 in the cell 55. In this case, the superabsorbent polymer particles 53 cannot be dispersed in an accurate shape that coincides with the periphery of the cell 55, particularly for the peripheral cells 55 located at the periphery of the region containing the superabsorbent polymer particles 53. As can be seen from the shape of the dispersion region 53A of the superabsorbent polymer particles 53 indicated by oblique lines in FIGS. 13 and 14, the superabsorbent polymer particles 53 are placed so that the periphery of the dispersion region 53A passes through the middle of the peripheral cell 55. It is desirable to spray. In this case, the amount of inclusion of the superabsorbent polymer particles 53 in the peripheral cell 55 is smaller than the cell 55 located on the inner side of the peripheral cell 55, and when the cell 55 is provided outside the peripheral cell 55, The cell 55 becomes an empty cell 56 that does not substantially contain the superabsorbent polymer particles 53.

  In the above example, only the superabsorbent polymer particles 53 are encapsulated in the cell 55, but it is also possible to encapsulate powders other than the superabsorbent polymer particles 53 such as deodorant particles together with the superabsorbent polymer particles 53. it can.

  In the above example, the largest enlarged section 57 composed of a set of a plurality of cells 55 or a single cell 55 surrounded by the joints 54 and having only the weak joints 54b located between the cells 55. Although it is a form which has, it can also be set as the form which does not have the largest expansion division 57. FIG. That is, when cells that have weak joints and strong joints and that are adjacent to each other through weak joints can be combined by peeling of the weak joints and can be expanded to a larger single cell, At the time of absorption, the weakly bonded portion is peeled off due to the expansion of the superabsorbent polymer particles, but the strong bonded portion is not peeled off. The height is limited by the strong joint. For this reason, when the joint portion is provided in a uniform pattern, the higher the numerical ratio of the weak joint portion (in this case, synonymous with the lower numerical ratio of the strong joint portion), when absorbing excretory fluids, The coalesced cell will be greatly raised. Therefore, even in the form without the most enlarged section, the joint portion is provided in a uniform pattern, and the numerical ratio of the weak joint portion occupying the joint portion is gradually increased from the center in the width direction to the both sides in the width direction of the absorber. When the excretory fluid is absorbed, the larger and higher the united cells are formed toward the both sides in the width direction of the absorber, the urine moving in the width direction is formed. It becomes a blocking body that blocks and prevents side leakage (not shown).

<Explanation of terms in the specification>
When the following terms are used in the specification, they have the following meanings unless otherwise specified in the specification.
・ "MD direction" and "CD direction" mean the flow direction (MD direction) in production equipment and the transverse direction (CD direction) perpendicular to this, and either one is the front-rear direction of the product. The other is the width direction of the product. The MD direction of the nonwoven fabric is the direction of fiber orientation of the nonwoven fabric. The fiber orientation is the direction along which the fibers of the nonwoven fabric are aligned. For example, the fiber orientation can be determined from the measurement method according to the TAPPI standard method T481, the fiber orientation test method using the zero-range tensile strength, It can be discriminated by a simple measuring method for determining the orientation direction.
-"Developed state" means a state where the plate is flattened without contraction or slack.
“Elongation rate” means a value when the natural length is 100%.
"Artificial urine" is urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97 0.09 wt% is mixed and used at a temperature of 40 degrees unless otherwise specified.
-"Gel strength" is measured as follows. Add 1.0 g of superabsorbent polymer to 49.0 g of artificial urine and stir with a stirrer. The produced gel is left in a constant temperature and humidity chamber of 40 ° C. × 60% RH for 3 hours and then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500, manufactured by I.techno Engineering).
・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. A sample with a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm × 250 mm, ± 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.
-"Thickness" is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression tester) under the conditions of load: 0.098 N / cm ² and pressure area: 2 cm ² .
-The amount of water absorption is measured according to JIS K7223-1996 "Test method for water absorption of superabsorbent resin".
・ The water absorption rate is the “time to end point” when JIS K7224-1996 “Test method for water absorption rate of superabsorbent resin” is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. .
・ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in a standard state (test location is temperature 20 ± 5 ° C, relative humidity 65% or less). .
-Unless otherwise specified, the dimensions of each part mean dimensions in a deployed state, not a natural length state.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior sheet, 12T ... Target sheet, 13 ... Fastening tape, 13A ... Locking part, 13B ... Tape body part, 13C ... Tape attachment part, 30 ... Top sheet, 40 ... Intermediate sheet , 60 ... side solid gathers, 62 ... gather sheets, 50 ... absorbers, 51 ... front side sheets, 51c ... dents, 52 ... back side sheets, 53 ... superabsorbent polymer particles, 54 ... joints, 54a ... strong joints 54b ... weak joint, 54c ... edge joint, 55 ... cell, 56 ... empty cell, 57 ... maximum expansion section, 58 ... length in the front-rear direction, LD ... front-back direction, WD ... width direction, W1 ... first W2 ... second width direction range, W3 ... third width direction range.

Claims (6)

Included in this cell are a front side sheet, a back side sheet arranged on the back side, a large number of cells surrounded by a joint between the front side sheet and the back side sheet, and the front side sheet and the back side sheet are not joined. In an absorbent article comprising an absorbent body having a powder comprising superabsorbent polymer particles;
The joint includes a weak joint that can be peeled off due to the expansion force of the superabsorbent polymer particles in the adjacent cells, and a strong joint that does not peel off due to the expansion force of the superabsorbent polymer particles in the adjacent cells.
Cells that are adjacent via the weak junction can be merged by peeling off the weak junction, and can be expanded to a larger single cell,
At least in the intermediate part in the width direction of the crotch part, the joint parts are provided in a uniform pattern, and the number of the weak joint parts occupying the joint part as it goes from the center part in the width direction of the absorber to both sides in the width direction The ratio increases stepwise or continuously,
An absorbent article characterized by the above. At least in the middle in the width direction of the crotch,
The joint is provided along a pattern in which polygons are arranged without gaps,
The cell has a polygon surrounded by a polygonal portion of the joint, and the side closest to the width direction among the sides where the joint in the cell is located, It is not connected linearly to the side closest to the width direction in the adjacent cell,
The absorbent article according to claim 1. At least in the intermediate part in the width direction of the crotch part, the content per unit area of the superabsorbent polymer particles increases stepwise or continuously from the central part in the width direction of the absorbent body toward both sides in the width direction. ,
The absorbent article according to claim 1 or 2. At least in the middle part in the width direction of the crotch part, the largest enlarged section consisting of a set of a plurality of cells or a single cell surrounded by the strong joints and having only weak joints located between the cells. However, they are arranged in the front-rear direction and the width direction, and the most enlarged sections are longer in the front-rear direction length on both sides in the width direction of the absorber.
The absorptive article according to any one of claims 1 to 3. At least in the middle in the width direction of the crotch,
The joint portion is provided along a pattern in which polygons having opposite sides along the width direction are arranged without gaps,
The cell has a polygon surrounded by a polygonal portion of the joint, and in the most enlarged section composed of a set of the plurality of cells, the side of the cell where the joint is located Among them, the weak joint is provided only at the position of the side parallel to the width direction,
The absorbent article according to claim 4. The cells on both sides in the middle of the absorbent body in the front-rear direction are empty cells with less inclusion amount per unit area of the superabsorbent polymer particles than other cells,
In the region located between the empty cells on both sides, the joint is provided in a uniform pattern, and the weak joint occupies the joint as it goes from the center in the width direction to both sides in the width direction. The numerical ratio of increases stepwise or continuously,
The absorbent article of any one of Claims 1-5.

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