WO2017169343A1

WO2017169343A1 - Absorbent article

Info

Publication number: WO2017169343A1
Application number: PCT/JP2017/006713
Authority: WO
Inventors: 彩井手
Original assignee: 大王製紙株式会社
Priority date: 2016-03-30
Filing date: 2017-02-23
Publication date: 2017-10-05
Also published as: JP2017176507A; JP6219436B2

Abstract

This absorbent article comprises an absorbent (50) having cells (55), the perimeter of each of which is surrounded by a joint (54) that joins a front sheet (51) and a rear sheet (52), and in which the front sheet (51) and the rear sheet (52) are not joined, and a particulate containing highly absorbent polymer particles (53) contained within these cells (55). The joints (54) include weak joints (54b) which can be peeled by the expansive force of the highly absorbent polymer particles (53) within adjoining cells (55), and strong joints (54a) that are not peeled by the expansive force of the highly-absorbent polymer particles (53) within adjoining cells (55). In an intermediate area in the width direction (WD) of the absorbent, a dispersion improving part (57) that comprises a vertical strong joint line (58) that continues from the strong joint (54a) in the longitudinal direction (LD), and adjoining low-expansion cells (55s) adjoining on both sides thereof, is provided.

Description

Absorbent articles

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, some cell absorbers have been proposed in which the joint between the front sheet and the back sheet peels during absorption, and the cell volume is increased by the combination of adjacent cells (for example, see Patent Documents 1 to 5 below). ). In such a cell absorber, if the joint has a portion that continuously or intermittently forms a row, the joint portion along the portion where the joint forms a row until the joint is peeled off during absorption expansion. Since the groove | channel which makes a bottom part is formed, the spreading | diffusion of the excretion liquid along the groove | channel can be anticipated.
However, in the case where the joint part peels uniformly like the conventional one, if the joint part is easy to peel off, the groove may disappear at an early stage and the liquid diffusion at the time of absorption expansion may be insufficient. If the joint is difficult to peel, problems such as the aforementioned gel blocking may occur.

JP 2009-061230 JP-T 09-504207 Special table 2014-500736 gazette Noto 03172565 JP 2011-189067 A JP 09-327479 A Japanese Patent Laid-Open No. 10-137291 JP 2003-265525 A

Therefore, a main problem of the present invention is to provide an absorbent article provided with a cell absorber that is less likely to lose diffusion grooves formed during absorption expansion and is less likely to cause problems such as gel blocking.

The typical aspects 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.
In the intermediate region in the width direction of the absorber, a longitudinal strong joint line in which the strong joint portion extends in the front-rear direction, and a diffusivity improving portion composed of low expansion cells adjacent to both sides thereof are provided,
The low expansion cell has a smaller amount of inclusion per unit area of the superabsorbent polymer particles than a cell adjacent to both sides of the diffusibility improving portion, and a cell adjacent to both sides of the diffusibility improving portion. The joint between is a weak joint,
An absorbent article characterized by the above.

(Function and effect)
The strongly bonded portion in the diffusivity improving portion of the present invention is a portion that does not peel even if the cells on both sides absorb and expand, and the cells adjacent to both sides have weakly bonded portions, but contain highly absorbent polymer particles. It is a low expansion cell with a relatively small amount. Therefore, at the beginning of excretion of the excretory fluid, a wide groove having the diffusivity improving portion as a bottom is formed due to the difference in expansion between the diffusivity improving portion and the surrounding portion, and the liquid diffusion is promoted by the groove. This state continues until the weak joint between the low expansion cell of the diffusibility improving part and the cells on both sides thereof is released due to the expansion force of the superabsorbent polymer particles in the cells around the diffusivity improving part. Since the strong joint does not come off even after the weak joint is removed, the groove having the strong joint at the bottom remains, but the diffusibility is maintained, although the width of the groove is reduced. In other words, the width of the groove is wide at the beginning of absorption, where diffusion of a large amount of excreta is important, and thereafter, the low expansion cell of the diffusibility improving unit is also united with the surrounding cells so as not to cause problems such as gel blocking. However, the groove remains due to the strong joint, and the diffusibility improving action is maintained.
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).

<Second aspect>
The weakly joined portion between the low expansion cell of the diffusibility improving portion and the cell adjacent to both sides of the diffusibility improving portion has higher joining strength than the other weakly joined portions, and is joined to the strongly joined portion. The absorbent article according to the first aspect, having low strength.

(Function and effect)
When configured in this way, the weakly bonded portion between the low expansion cell of the diffusibility improving portion and the cell adjacent to both sides of the diffusibility improving portion is difficult to come off, and the diffusibility improving portion is longer. This is preferable because the groove formed by is maintained in a wide state.

<Third Aspect>
Absorbent article according to the first or second aspect, in which a plurality of transverse strong bonding lines, each of which is a portion in which the strong bonding portion continues continuously or intermittently in the width direction or the oblique direction, are provided at intervals in the front-rear direction. .

(Function and effect)
If the cells can be combined with each other over the entire front-rear direction of the absorbent body, the gelled product of the superabsorbent polymer particles that have expanded during absorption can move greatly in the front-rear direction within the combined cell, and the gelled product can be reduced in the crotch area. There is a risk of gathering at the place and worsening the fit. On the other hand, when the above-described transverse strong bonding line is provided, the gelled product of the superabsorbent polymer particles can be prevented from moving in the front-rear direction by the strong bonding portion that does not peel at the time of absorption, and the shape of the absorber collapses. Can be prevented.

<Fourth aspect>
Longitudinal strong joint lines, which are portions where the strong joint portions continue in the front-rear direction over the entire length of the absorber, are provided on both sides in the width direction along the side edges of the cells located on the outermost side in the width direction, and these width directions It is also provided in the middle of
The diffusivity improving portion is a portion including a longitudinal strong bonding line at the central portion in the width direction,
The transverse strong joint line is a portion that continues in the width direction or oblique direction so as to span between the longitudinal strong joint lines adjacent in the width direction.
The absorbent article of a 3rd aspect.

(Function and effect)
In this way, when the strong joints are arranged in a mesh form vertically and horizontally, the cells do not coalesce beyond the most enlarged section surrounded by the strong joints, so the gel of the superabsorbent polymer particles expanded during absorption is outside the largest enlarged section. Does not move, and it is possible to effectively prevent the shape of the absorber from collapsing during absorption. In addition, the longitudinal liquid diffusibility is improved by the longitudinal strong joint line, which is a portion where the strong joint portion continues in the front-rear direction, and the lateral strong joint line, which is a portion where the strong joint portion continues in the width direction or the oblique direction, Improves liquid diffusibility. Furthermore, the longitudinal strong joint lines on both sides also have a function of preventing leakage of the superabsorbent polymer particles from the side edges.

<Fifth aspect>
The joining portion is a portion where the front side sheet and the back side sheet are welded,
The weak joint and the strong joint are provided in a dotted line along the direction surrounding the cell,
The line width of the weak joint is narrower than the line width of the strong joint,
The point interval between the weak joints is wider than the point interval between the strong joints,
The absorbent article according to any one of the first to fourth aspects.

(Function and effect)
When forming the joint by welding the front side sheet and the back side sheet, the weak joint can be formed only by widening the point interval by making the joint a dotted line, but the joint is a boundary between adjacent cells. Therefore, if the point interval is too wide, the gap between adjacent cells increases, and the superabsorbent polymer particles easily move. Therefore, if the dotted line-shaped weakly bonded portion is formed by combining the width of the bonded portion with the narrowness of the interval, the weakly bonded portion easily peels in spite of the small gap.

<Sixth aspect>
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;
In the position where the sides where the weak joints are located in the cell intersect, the joints are not provided,
The absorbent article according to any one of the first to fifth aspects.

(Function and effect)
Thus, it is preferable not to provide a joint portion at a position where the sides where the weak joint portions are located, because the weak joint portion is easily peeled off, and cell coalescence proceeds smoothly.

<Seventh aspect>
At least the cell at the position where the front and rear ends of the absorber pass, and the cells on both sides in the middle of the absorber in the front-rear direction have a smaller amount of superabsorbent polymer particles per unit area than other cells. Cell,
The absorbent article according to any one of the first to sixth aspects.

(Function and effect)
For example, since the front end and the rear end of the absorbent body are formed by cutting into individual absorbent bodies at the time of manufacture, the life of the blade of the cutting device may be shortened if high absorbent polymer particles are contained at this position. There is. Therefore, it is desirable that the cell at the position where the front and rear ends of the absorber pass is an empty cell. In addition, in an absorbent body in which superabsorbent polymer particles are mixed with hydrophilic short fibers such as pulverized pulp and stacked in a cotton shape, the middle part of the front-rear direction LD can be formed in a constricted shape along the leg circumference. Generally, even in the cell absorber, the cells on both sides in the middle in the front-rear direction are emptied cells, so that the portion is less expanded after absorption. The shape fits around.

According to the present invention, there are advantages that the diffusion groove formed at the time of absorption expansion is more difficult to disappear and problems such as gel blocking are less likely to occur.

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. FIG. 7 is a sectional view taken along line 7-7 in FIG. (A) 8-8 sectional view of FIG. 1, (b) 9-9 sectional view of FIG. FIG. 5 is a sectional view taken along the line 5-5 in FIG. (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 an absorber. It is a top view of an absorber. 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 junction part similar to FIG. 8 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 a top view of the absorber which showed the joined part simply. FIG. 16 is a sectional view taken along the line 3-3 in FIG. 15. 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 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>
FIGS. 1 to 6 show an example of a tape-type disposable diaper. In FIG. 1, symbol X indicates the full width of the diaper excluding the fastening tape, and symbol L indicates the total 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.

In this tape-type disposable diaper, the entire outer surface of the absorbent main body 10 and the side flaps SF is formed by the exterior sheet 12. 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, side solid gathers 60, 60 that protrude (stand up) toward the wearer's skin are provided, and the gather sheets that form the side solid gathers 60, 60 are provided. 62 and 62 are fixed to a range from the both side portions of the top 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 a non-woven fabric is used, the fiber basis weight is desirably 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 illustrated form is arranged 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 is composed of a gather sheet 62 and an elongated elastic elastic member 63 fixed to the gather sheet 62 in a stretched 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 fixing start end of the fixing portion 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 diameter 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. The superabsorbent polymer particles 53 include starch-based, cellulose-based and synthetic polymer-based particles such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, sodium carboxymethyl cellulose, and the like. 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 speed 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.

Further, 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 generally stated, it can be 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. The cells 55 can be arranged by combining a plurality of types of cells 55 having different shapes and dimensions as shown in FIG.

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. 19B, a square lattice shape as shown in FIG. 19C, a rectangular lattice shape as shown in FIG. 19 (e) as shown in FIG. 19 (e) (a form in which two groups are provided so that a large number of groups in a parallel 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 and expansion pressure of the superabsorbent polymer particles 53 in the cells 55 to be combined into one large cell 55. On the other hand, the strongly bonded portion 54a is a portion that does not peel even if the cells 55 on both sides thereof absorb and expand, so that it continues in a specific direction to improve the diffusibility or the gelled product of the superabsorbent polymer particles 53. Such as preventing the flow of the liquid and reducing the contact area on the surface side.

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 an edge joint part 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 joining portion 54 that joins the front side sheet 51 and the back side 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. Further, 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. In particular, 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 FIG. 8, FIG. 11 to FIG. 15, FIG. 17 and FIG. 18, in the middle region of the absorbent body 50 in the width direction WD, a longitudinal strong junction in which a strong junction 54a continues in the front-rear direction LD. A diffusivity improving portion 57 comprising a line 58 and low expansion cells 55 s adjacent to both sides thereof is provided, and the low expansion cell 55 s of the diffusibility improving portion 57 is adjacent to both sides of the diffusivity improving portion 57. The amount of inclusion per unit area of the superabsorbent polymer particles 53 is smaller than that of the cell 55 and the junction 54 between the cell 55 adjacent to both sides of the diffusibility improving portion 57 is a weak junction 54b. ing. Therefore, as shown in FIG. 10, at the beginning of excretion of the excretory fluid, a wide groove with the diffusibility improving portion 57 as the bottom is formed due to the difference in expansion between the diffusivity improving portion 57 and the surrounding portion. This promotes liquid diffusion. This state is a weak joint between the low expansion cell 55s of the diffusibility improving portion 57 and the cells 55 on both sides thereof due to the expansion force of the superabsorbent polymer particles 53 in the cells 55 around the diffusivity improving portion 57. Since the strong joint 54a does not come off even after the weak joint 54b is detached, the groove having the strong joint 54a at the bottom remains, but the diffusibility is maintained. That is, the width of the groove is wide at the beginning of absorption where diffusion of a large amount of excretory fluid is important, and thereafter, the low expansion cell 55s of the diffusibility improving portion 57 is also the surrounding cell 55 so as not to cause problems such as gel blocking. However, the strong bonding portion 54a leaves a groove, and the diffusibility improving effect is maintained.

The amount of inclusion of the superabsorbent polymer particles 53 in the low expansion cell 55s is preferably 1/3 or less of the adjacent cells 55 in terms of weight ratio, and particularly preferably not included at all.

In particular, as shown in FIG. 13, the first weak junction 54 e between the low expansion cell 55 s of the diffusibility improving unit 57 and the cell 55 adjacent to both sides of the diffusibility improving unit 57 is the other second When the bonding strength is higher than that of the weak bonding portion 54f and lower than that of the strong bonding portion 54a, the low expansion cell 55s of the diffusibility improving portion 57 and the cell 55 adjacent to both sides of the diffusibility improving portion 57 are provided. The first weakly joined portion 54e between the first and second portions is less likely to come off, and the groove formed by the diffusibility improving portion 57 is maintained in a wide state for a longer time. 8, FIG. 11 to FIG. 15, FIG. 17 and FIG. 18, the strong joint 54a and the weak joint 54e having a relatively high joint strength are represented by thick dotted lines, and the other

weak joints

54b and 54f are The cell 55 containing the superabsorbent polymer particles 53 (that is, the cell 55 excluding the low expansion cell 55s and the empty cell 56 described later) is hatched.

The diffusibility improving portion 57 may be provided over the entire length of the absorber 50 as shown in FIGS. 8 and 11 to 15, and as shown in FIGS. In particular, it may be provided only in the range including the crotch portion and extending in the front and rear sides. Further, the diffusivity improving portion 57 is provided at one central portion in the width direction WD as shown in FIGS. 8, 11 to 15 and 17, and the interval in the width direction WD is set as shown in FIG. It can also be provided in several places.

In order to expand the width of the diffusibility improving portion 57, as shown in FIG. 15, a pair of longitudinal strong joint lines 58 are provided along both side edges of the cells 55 arranged in the front-rear direction LD. The cells 55 that are adjacent to each other and on both sides in the width direction WD may be low expansion cells 55s. By increasing the number of the longitudinal strong bonding lines 58 and the number of the low expansion cells 55s, the width of the diffusibility improving portion 57 can be further expanded.

If the cells 55 can be combined with each other over the entire front-and-rear direction LD of the absorbent body 50, the gelled product of the superabsorbent polymer particles 53 expanded at the time of absorption can move greatly in the front-and-rear direction LD in the combined cell 55. May gather at low places such as the crotch and worsen the feeling of wearing. Therefore, as shown in FIG. 8, FIG. 11, FIG. 14 to FIG. 16, FIG. 18, the lateral strong joint line 59, which is a portion where the strong joint portion 54a continues continuously or intermittently in the width direction WD or oblique direction, It is a preferable embodiment that a plurality of the front-rear direction LDs are provided at intervals. Thereby, the front-rear direction LD movement of the gelled product of the superabsorbent polymer particles 53 can be prevented by the strong joint 54a that does not peel at the time of absorption, and the shape of the absorbent body 50 can be prevented from collapsing. Of course, as shown in FIG. 12, FIG. 13 and FIG. As shown in FIG. 14, the cells 55 adjacent to both the front and rear sides of the lateral strong joint line 59 can be low-expansion cells 55 s, and a lateral diffusibility improving portion 57 can be provided.

In particular, as shown in FIGS. 8, 11, 14, 15 and 18, the longitudinal strong bonding line 58, which is a portion where the strong bonding portion 54a continues in the front-rear direction LD over the entire length of the absorber 50, It is provided on both sides of the width direction WD along the side edge of the cell 55 located on the outermost side of the WD, and is also provided in the middle of the width direction WD. When the portion extends in the width direction WD or in an oblique direction so as to extend between the longitudinal strong joint lines 58 adjacent to the WD, the cell 55 does not coalesce beyond the most enlarged section 55G surrounded by the strong joint portion 54a. The gelled product of the superabsorbent polymer particles 53 does not move out of the most enlarged section 55G, and can effectively prevent the shape of the absorber 50 from being deformed during absorption. Further, the liquid diffusibility in the vertical direction is improved by the longitudinal strong bonding line 58 which is a portion where the strong bonding portion 54a continues in the front-rear direction LD, and the horizontal strong bonding where the strong bonding portion 54a is a portion which continues in the width direction WD or the oblique direction. The line 59 improves the lateral liquid diffusibility. For example, in the form shown in FIG. 8, if it is assumed that urine is excreted at the position of the symbol Z, the urine diffuses around as shown in FIG. 53 absorbs. At this time, as shown in FIGS. 9 and 10, the cell 55 in which the expansion pressure of the internal superabsorbent polymer particles 53 is increased, the weak joint 54 b around the cell 55 peels without being able to resist the expansion pressure, Merge with adjacent cell 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.

The size, shape, and arrangement of the most enlarged section 55G (that is, the arrangement of the strong joints 54a) can be determined as appropriate. However, if the largest enlargement section 55G is made too small, there is no significance in providing the strong joints 54a, and the number of cells 55 Even if there is a large amount, when it is formed to be elongated, the shape after the cells 55 are combined becomes a shape that does not easily swell. For example, when the cell 55 is a regular hexagon as shown in the figure, as shown in FIG. 11, FIG. 14, FIG. 15 and FIG. It is preferable that the peripheral shape is a closed shape formed by connecting two to four continuous sides per cell 55 in the cell 55 along the peripheral edge. As a result, the cells 55 are merged sequentially and are easily expanded smoothly to the maximum expansion section 55G, and the maximum expansion section 55G has a shape that easily expands, and the cell 55 volume with respect to the number of combined cells 55 when expanded to the maximum expansion section 55G. Increases the amount of increase. 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 under the influence of expansion and contraction during manufacturing.

In the periphery of the most enlarged section 55G, a portion connecting two continuous sides per one cell 55 can be a straight portion, and a portion connecting three continuous sides per one cell 55 is a straight portion. Or a corner portion (direction changing portion) with an inner angle of 120 degrees, and a portion connecting four continuous sides per cell 55 can be a direction changing portion with an inner angle of 60 degrees or 180 degrees. . Therefore, by combining these linear portions and corner portions, the peripheral shape (arrangement of the strong joint portions 54a) of the most enlarged section 55G is changed to a substantially regular triangle shape as shown in FIG. 11, or FIGS. As shown in FIG. 18, it can be made into a substantially parallelogram shape, or it can be made into a substantially square shape as shown in FIG.

In the form shown in FIGS. 8 to 11, the longitudinal strong joint line 58 is provided at the center and both sides of the width direction WD of the absorber 50, and the lateral strong joint line 59 is the central longitudinal joint line. 58 and the longitudinal strong joint lines 58 on both sides are formed in a zigzag shape extending in the front-rear direction while being repeatedly bent left and right. As a result, a substantially triangular maximum expansion section 55G having a vertex at the position of the central longitudinal strong joint line 58 and a substantially triangular maximum expansion section 55G having a vertex at the position of the longitudinal strong joint line 58 on both sides are obtained. These are repeatedly formed alternately in the front-rear direction. When the lateral strong bonding lines 59 are formed in such a zigzag shape, the liquid diffusion in the lateral direction can be efficiently promoted with a small number of the lateral strong bonding lines 59, and the most enlarged section 55G becomes a substantially triangular shape that is easy to swell. The volume increase of the cell 55 with respect to the number of cells 55 combined is also excellent, which is preferable.

On the other hand, as shown in FIG. 8 and the like, it is possible to provide empty cells 56 in which the amount of inclusion per unit area of the superabsorbent polymer particles 53 is smaller than other cells. In FIG. 8, FIG. 11 to FIG. 15, FIG. 17 and FIG. 18, the cell 55 containing the superabsorbent polymer particles 53 (that is, the cell 55 excluding the low expansion cell 55s and the empty cell 56 described later) is hatched. Has been. Among them, the hatched area 53A in FIG. 8 assumes the shape of the dispersion area of the superabsorbent polymer particles 53 at the time of manufacture, and therefore the peripheral cell 55 has a portion without the hatched pattern. In the case where the superabsorbent polymer particles 53 are movable in the cell 55, the position of the superabsorbent polymer particles 53 in the cell 55 is not fixed in the product. The superabsorbent polymer particles 53 can be distributed throughout the cell 55. The amount of the superabsorbent polymer particles 53 included in the empty cell 56 is preferably ½ or less that of the other cells in terms of weight ratio, and particularly preferably not included at all. For example, since 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, if the superabsorbent polymer particles 53 are contained in this position, the life of the blade of the cutting device is increased. May be shortened. Therefore, it is desirable that the cell 55 at a position where at least the front and rear ends of the absorber 50 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 are formed into a cotton shape, the middle part of the front-rear direction LD is formed in a constricted shape so as to follow the leg circumference. In general, however, in the absorbent body 50, the cells 55 on both sides in the middle of the front-rear direction LD are made empty cells 56, so that the portion is less expanded after absorption. Also, the absorbent body 50 is shaped to fit around the legs.

When manufacturing the absorbent body 50, 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 are contained on the front side sheet 51 or the back side sheet 52. After the superabsorbent polymer particles 53 are uniformly dispersed over the entire region (the region excluding the portion that becomes the empty cell 56), the joint portion 54 is formed to integrate the front side sheet 51 and the back side sheet 52 and the cell. Preferably, the superabsorbent polymer particles 53 are confined in the 55. In this case, it is difficult to disperse the superabsorbent polymer particles 53 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. Therefore, as can be seen from the shape of the spraying region 53A of the superabsorbent polymer particles 53 indicated by hatching in FIG. 8, the superabsorbent polymer particles 53 are sprayed so that the periphery of the spraying region 53A passes through the middle of the peripheral cell 55. It is desirable to do. 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 such as deodorant particles together with the superabsorbent polymer particles 53. .

<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, and the tensile strength ratio in the front-rear direction and the width direction. 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 meter (KES-G5 handy compression tester) under the conditions of load: 10 gf / cm ² and pressure area: 2 cm ² .
The 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, 55s ... low expansion cell, 55G ... maximum expansion section, 56 ... empty cell, 57 ... diffusivity improving part, 58 ... longitudinal strong joint line, 59 ... transverse strong bonding line, LD ... front-back direction, WD ... width direction.

Claims

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.
In the intermediate region in the width direction of the absorber, a longitudinal strong joint line in which the strong joint portion extends in the front-rear direction, and a diffusivity improving portion composed of low expansion cells adjacent to both sides thereof are provided,
The low expansion cell has a smaller amount of inclusion per unit area of the superabsorbent polymer particles than a cell adjacent to both sides of the diffusibility improving portion, and a cell adjacent to both sides of the diffusibility improving portion. The joint between is a weak joint,
An absorbent article characterized by the above.
The weakly joined portion between the low expansion cell of the diffusibility improving portion and the cell adjacent to both sides of the diffusibility improving portion has higher joining strength than the other weakly joined portions, and is joined to the strongly joined portion. The absorbent article according to claim 1, which has low strength.
The absorptive article according to claim 1 or 2 by which a plurality of transverse strong joint lines in which said strong joint part is a portion which continues or intermittently continues in the width direction or diagonal direction are provided at intervals in the front-rear direction. .
Longitudinal strong joint lines, which are portions where the strong joint portions continue in the front-rear direction over the entire length of the absorber, are provided on both sides in the width direction along the side edges of the cells located on the outermost side in the width direction, and these width directions It is also provided in the middle of
The diffusivity improving portion is a portion including a longitudinal strong bonding line at the central portion in the width direction,
The transverse strong joint line is a portion that continues in the width direction or oblique direction so as to span between the longitudinal strong joint lines adjacent in the width direction.
The absorbent article according to claim 3.
The joining portion is a portion where the front side sheet and the back side sheet are welded,
The weak joint and the strong joint are provided in a dotted line along the direction surrounding the cell,
The line width of the weak joint is narrower than the line width of the strong joint,
The point interval between the weak joints is wider than the point interval between the strong joints,
The absorbent article according to any one of claims 1 to 4.
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;
In the position where the sides where the weak joints are located in the cell intersect, the joints are not provided,
The absorbent article according to any one of claims 1 to 5.
At least the cell at the position where the front and rear ends of the absorber pass, and the cells on both sides in the middle of the absorber in the front-rear direction have a smaller amount of superabsorbent polymer particles per unit area than other cells. Cell,
The absorbent article according to any one of claims 1 to 6.