TW202128105A - Absorbent article - Google Patents

Abstract

To achieve both absorbency of viscous liquid and absorption performance of non-viscous liquid. An absorber 70 includes a cell absorption sheet 50 which has: an upper sheet 51 and a lower sheet 52 having liquid permeability; cells 55 which are surrounded by joint parts 54 of the upper sheet 51 and the lower sheet 52 where the upper sheet 51 and the lower sheet 52 are not bonded; and particulate matters containing high-absorbent polymer particles that are housed in the cells 55. The lower sheet 52 is a highly water absorptive nonwoven fabric whose Klemm water-absorption is 50 mm or more, whose water capacity under load is 0.1 g or more, and whose water capacity under no load is 0.5 g or more.

Description

Absorbent articles

The present invention relates to an absorbent article which improves absorption performance.

An absorbent article comprising an absorber, a liquid-permeable top sheet, and a liquid-impermeable sheet, the top sheet covers the surface side of the absorber, the liquid-impermeable sheet covers the back side of the absorber, and the absorber To absorb and maintain the excretion fluid such as urine or menstrual blood that has passed through the top sheet. As the absorbent body, an absorbent body in which superabsorbent polymer particles (SAP, Superabsorbent polymers) are mixed with hydrophilic short fibers such as pulverized pulp and fibrillated into cotton is widely used, and there are various proposals (for example, refer to the following patent Documents 1 to 6), as an absorbent sheet (hereinafter, also referred to as cell absorbent sheet) that can ensure sufficient absorption and further respond to the requirements for thinning, weight reduction, and cost reduction, it has: a large number of cells (cells) ), the surrounding area is surrounded by the junction of the upper and lower sheets with liquid permeability, and the upper and lower sheets are not joined; and, the powder and granule, which contains the superabsorbent polymer contained in the cell particle.

However, the absorption performance of the cell absorbent sheet depends on the superabsorbent polymer particles. Therefore, although the absorption capacity is suitable for the absorption of large amounts of non-viscous fluids such as urine, the absorption speed will be slower on the contrary, so it has been absorbed through the cell. The non-sticky liquid of the sheet may move on the liquid-impermeable sheet, seep out from the absorbent body to the skin side, adhere to the skin, or leak.

[Prior Technical Literature] (Patent Document) Patent Document 1: Japanese Special Publication No. 09-504207 Patent Document 2: JP 2014-500736 Gazette Patent Document 3: Japanese Patent Application Publication No. 2011-189067 Patent Document 4: Japanese Patent Laid-Open No. 10-137291 Patent Document 5: Japanese Patent Application Publication No. 2017-176507 Patent Document 6: Japanese Patent Application Laid-Open No. 2010-522595

[The problem to be solved by the invention] Therefore, the main problem to be solved by the present invention is to suppress the movement of liquid around the cell absorption sheet.

[Technical means to solve the problem] The absorbent article that solves the above-mentioned problems is as follows. ＜The first aspect＞ An absorbent article characterized by comprising an absorbent body, a liquid-permeable top sheet, and a liquid-impermeable sheet, the top sheet is arranged on the surface side of the absorbent body, and the liquid-impermeable sheet is arranged on the absorbent body The dorsal side of the body; Wherein, the aforementioned absorber includes a cell absorption sheet, the cell absorption sheet has cells and powder particles, and the cell is surrounded by liquid-permeable upper and lower sheets, and the upper and lower sheets. The joint part of the sheet surrounds the non-joining part of the upper sheet and the lower sheet, and the powder and granule include superabsorbent polymer particles contained in the cell; The aforementioned bottom sheet is a super absorbent nonwoven fabric, and the super absorbent nonwoven fabric has a KLEMM water absorption of 50 mm or more, a water retention capacity of 0.1 g or more under load, and a water retention capacity of 0.5 g or more under no load.

(Effect) In this absorbent article, the non-viscous liquid supplied to the cell absorbent sheet can be absorbed by the super absorbent polymer particles in the cell absorbent sheet, and reaches without being absorbed by the super absorbent polymer particles. After the non-viscous liquid of the lower sheet is absorbed by the lower sheet, retains water in the lower sheet and diffuses, it is sucked up by the superabsorbent polymer particles in the cell absorbent sheet. Therefore, it is possible to reduce the possibility that the non-viscous liquid that has passed through the cell absorption sheet will move on the liquid-impermeable sheet, seep out from the periphery of the cell absorption sheet to the skin side, adhere to the skin, or leak.

<Second aspect> The absorbent article according to the first aspect, wherein the super absorbent non-woven fabric constituting the bottom sheet is a wet-type non-woven fabric, and the wet-type non-woven fabric contains 50% or more pulp fibers or rayon fibers, and The mass per unit area is 25-50g/m ² .

(Effect) If this kind of wet non-woven fabric is used, the capillary phenomenon generated by the tiny fiber gap can quickly absorb and diffuse the non-viscous liquid, so it is preferable. In addition, this wet-type non-woven fabric not only has high water absorption by KLEMM, but is also very thin and soft. Therefore, it is possible to suppress the decrease in flexibility and increase in thickness of the entire cell absorbent sheet.

＜The third aspect＞ The absorbent article according to the second aspect, wherein the wet non-woven fabric has a support layer and a pulp layer, the support layer contains long fibers of synthetic resin, and the pulp layer is located on the outermost surface side and is composed of only pulp fibers.

(Effect) This kind of wet non-woven fabric can improve the water retention of the upper side of the lower sheet by the pulp layer, and can improve the strength by the existence of the support layer, so it is preferable.

＜The fourth aspect＞ The absorbent article according to any one of the first aspect to the third aspect, wherein the absorbent body has an upper auxiliary layer on the cell absorbent sheet; The upper auxiliary layer has a super absorbent nonwoven fabric and super absorbent polymer particles, the surface of the super absorbent nonwoven fabric is exposed on the top surface of the absorbent body and the KLEMM water absorption is 100mm or more, and the super absorbent polymer particles are adjacent to this The back of the super absorbent non-woven fabric.

(Effect) When the object of absorption is a viscous liquid such as muddy feces, watery feces, or liquid components in soft stools, the absorption speed will slow down, and it will remain on the surface of the diaper for a long time, so it is easy to be on the surface of the absorbent article It flows and moves and easily leaks from the surroundings. At this point, the absorption performance of the cell absorbent sheet depends on the superabsorbent polymer particles, so the absorption speed will slow down and it is not suitable for the absorption of viscous liquid. In order to solve this problem, in the absorbent article of this aspect, an upper auxiliary layer is provided on the top surface of the absorbent body, and the upper auxiliary layer is specialized for the absorption of viscous liquid. That is, the upper auxiliary layer has superabsorbent nonwoven fabric and superabsorbent polymer particles, the surface of the superabsorbent nonwoven fabric is exposed on the top surface of the aforementioned absorbent body and the KLEMM water absorption is more than 100mm, the superabsorbent polymer particles Adjacent to the back of this super absorbent nonwoven fabric, so even for viscous liquids, the super absorbent nonwoven fabric can quickly absorb and diffuse, and transfer to the super absorbent polymer particles adjacent to the back of the super absorbent polymer particles, through the super absorbent polymerization To absorb and maintain.

＜Fifth aspect＞ The absorbent article according to any one of the first aspect to the fourth aspect, wherein the portion of the top sheet located in each cell is pushed upward, and the top surface and bottom surface of the top sheet A pair of recesses and protrusions are formed.

(Effect) In the cell absorbent sheet, in order to ensure the volume when the superabsorbent polymer particles inside absorb and expand, it is preferable that at least one of the upper sheet and the lower sheet has a portion located in each cell, which is pushed outward in the thickness direction Of the recess. If the top sheet here has recesses, the surface area of the top sheet becomes larger and the liquid can be supplied to the superabsorbent polymer particles in the cell absorbent sheet in a wider range, which is preferable.

＜Sixth aspect＞ The absorbent article according to any one of the first aspect to the fifth aspect, wherein the part of the lower sheet located in each cell is pushed out downward, and the top surface of the lower sheet and A pair of recesses and protrusions are formed on the bottom surface.

(Effect) In the cell absorbent sheet, in order to ensure the volume when the superabsorbent polymer particles inside absorb and expand, it is preferable that at least one of the upper sheet and the lower sheet has a portion located in each cell, which is pushed outward in the thickness direction Of the recess. If the bottom sheet here has a recessed portion, the surface area of the bottom sheet becomes larger, and the bottom sheet has more water retention than the case where the bottom sheet is flat without performing shaping processing, which is preferable.

[Effects of the invention] According to the present invention, it is possible to suppress the movement of liquid to the periphery of the cell absorption sheet, which brings advantages.

Hereinafter, as an example of an absorbent article, an adhesive disposable diaper will be described with reference to the drawings. Figures 1 to 6 show an example of an adhesive-type disposable diaper. The symbol X in the figure represents the full width of the diaper excluding the fastening tape, and the symbol L represents the full length of the diaper. In addition, the constituent members adjacent to each other in the thickness direction can be fixed or joined in the same manner as a conventional diaper as necessary, except for the fixing or joining parts described below. The dotted part in the cross-sectional view represents an adhesive such as a hot-melt adhesive used as a means of fixing or joining. Hot melt adhesives can be applied by slit coating, continuous line or dot line bead coating, spiral, zigzag, wave, etc. spraying, or pattern coating (heated by relief printing). The transfer of melt adhesive) and other known methods are applied. Instead or in parallel, it is possible to apply a hot melt adhesive to the outer peripheral surface of the elastic member at the fixing portion of the elastic member, and fix the elastic member to the adjacent member. As the hot-melt adhesive, it can be used without particular limitation, such as EVA (ethylene-vinyl acetate copolymer), adhesive rubber (elastic system), olefin, polyester, and polyamide-based heat Fusion bonding agent. As a fixing or joining means for joining the constituent members, a raw material welding means such as heat sealing and ultrasonic sealing can be used. In the portion where liquid permeability in the thickness direction is required, an intermittent pattern is used to fix or join constituent members adjacent in the thickness direction. For example, when such intermittent fixing or joining is carried out by hot-melt adhesive, intermittent pattern coating such as spiral, zigzag, wavy, etc. can be appropriately used. When coating with a nozzle In the range greater than or equal to the width, it is possible to apply intermittent patterns such as spirals, zigzags, and wavy patterns in the width direction with or without an interval.

The basic structure of this adhesive-type disposable diaper is that an absorber 70 exists between the liquid-permeable top sheet and the liquid-impermeable sheet located on the back side. In addition, this adhesive-type disposable diaper has end flaps EF and a pair of side flaps SF. In part, this side flap SF protrudes more laterally than the side edge of the absorber 70. As shown in FIG. The side edges of the side wings SF are made into a condensed shape along the leg circumference, or they can be made into a straight line. The side flaps SF in the dorsal portion B are respectively provided with fastening tapes 13, and when the diaper is worn, the side flaps SF of the dorsal portion B are overlapped on the outside of the side flaps SF of the ventral portion F to tighten The fixing belt 13 is clamped at an appropriate place on the outer surface of the ventral part F.

In addition, in this adhesive-type disposable diaper, the entire outer surface except for the fastening tape 13 is formed by the outer non-woven fabric 12. In particular, in the area including the absorbent body 70, the liquid-impermeable sheet 11 is fixed to the inner surface of the exterior non-woven fabric 12 by an adhesive such as a hot-melt adhesive, and the liquid-impermeable sheet is further used here. On the inner surface side of 11, an absorber 70, an intermediate sheet 40, and a 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 70, and are made of hot-melt adhesives, etc. The peripheral edge portion that extends beyond the side edge of the absorber 70 in the top sheet 30 and the peripheral edge portion that extends beyond the side edge of the absorber 70 in the liquid-impermeable sheet 11 are joined. In addition, the liquid-impermeable sheet 11 is formed with a width slightly wider than that of the top sheet 30.

Further, on both sides of the absorbent main body portion 10, there are provided upright wrinkles 60 standing up to the wearer's skin side, and the wrinkle sheets 62 forming the upright wrinkles 60 are adhered to the top sheet In the range from the both sides of 30 to the inner surface of each side flap SF.

Hereinafter, the details of each part will be described in order. In addition, as the non-woven fabric in the following description, a conventional non-woven fabric can be appropriately used in accordance with the part and the purpose. As the constituent fibers of the nonwoven fabric, in addition to synthetic fibers such as olefin-based, polyester-based, and polyamide-based fibers such as polyethylene or polypropylene (in addition to single-component fibers, composite fibers such as core and sheath) can be selected, Regenerated fibers such as rayon and cuproammonium fibers, natural fibers such as cotton, etc. can also be used without particular limitation, and these fibers can also be used in combination. In order to improve the flexibility of the nonwoven fabric, it is preferable to use the constituent fibers as crimped fibers. In addition, the constituent fibers of the nonwoven fabric may be hydrophilic fibers (including fibers that are hydrophilic by a hydrophilic agent), hydrophobic fibers, or water-repellent fibers (including fibers that are water-repellent by a water-repellent agent). In addition, non-woven fabrics are generally classified into short-fiber non-woven fabrics, long-fiber non-woven fabrics, spunbonded non-woven fabrics, melt-blown non-woven fabrics, spunlace non-woven fabrics, and thermally bonded (hot air) non-woven fabrics based on fiber length, sheet forming method, fiber bonding method, and laminated structure. , Needle-punched non-woven fabrics, point-bonded non-woven fabrics, laminated non-woven fabrics (SMS non-woven fabrics, SMMS non-woven fabrics formed by sandwiching a meltblown layer between spunbond layers), etc., can also be used in any of these non-woven fabrics.

(Exterior non-woven fabric) The outer non-woven fabric 12 constitutes the outer surface of the product, and is a non-woven fabric that gives the outer surface of the product a cloth-like appearance and skin touch. The fiber unit area mass of the outer nonwoven fabric is desirably 10-50 g/m ² , particularly preferably 15-30 g/m ² . The outer non-woven fabric 12 can also be omitted, and in this case, the liquid-impermeable sheet 11 can be made into the same shape as the outer non-woven fabric 12 to form the outer surface of the product.

(Impermeable tablets) The material of the liquid-impermeable sheet 11 is not particularly limited. For example, a laminated non-woven fabric in which a non-woven fabric is laminated on an olefin resin such as polyethylene and polypropylene, or a polyethylene sheet, etc., is secured by a waterproof membrane. A substantially liquid-impermeable non-woven fabric (in this case, a liquid-impermeable sheet is composed of a waterproof membrane and a non-woven fabric) and the like. Of course, in addition to this, there can also be cited materials having liquid impermeability and moisture permeability that have been favored in recent years from the viewpoint of preventing dampness. As a sheet of the raw material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene and polypropylene, and the sheet is formed into a uniaxial or A microporous sheet obtained by biaxially extending. Furthermore, for non-woven fabrics made of microdenier fibers, a method such as reinforcement of leakage resistance, or coating of super absorbent resin, hydrophobic resin, or water repellent, is used even in A liquid-impermeable sheet made without using a waterproof membrane can also be used as the liquid-impermeable sheet 11. The leak-proofness reinforcement is to reduce fiber voids by applying heat or pressure.

(Top piece) The top sheet 30 is a liquid-permeable sheet material, such as a porous or non-porous non-woven fabric, a porous plastic sheet, and the like. The both sides of the top sheet 30 may be folded back toward the back side of the absorbent body 70, and as shown in the figure, it may be protruded from the side edge of the absorbent body 70 to the side without being folded back.

For the purpose of preventing the positional deviation of the top sheet 30 with respect to the components on the back side, it is desirable to fix it to the adjacent back side by means of bonding means such as heat sealing, ultrasonic sealing, etc., or hot-melt adhesive. member. In the illustrated example, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the portion of the packaging sheet 45 located on the surface side of the absorber 70 by a hot melt adhesive applied on the back surface thereof.

(Intermediate film) In order to make the excreted liquid after passing through the top sheet 30 move quickly to the absorber 70 side and prevent back seepage, the intermediate sheet 40 is joined to the back surface of the top sheet 30. The bonding between the intermediate sheet 40 and the top sheet 30 can also use thermal embossing or ultrasonic welding in addition to using a hot melt adhesive.

As the intermediate sheet 40, in addition to using a non-woven fabric, a resin film having a large number of permeable holes can also be used. As the non-woven fabric, the same material as the top sheet 30 can be used. If a material with higher hydrophilicity or higher fiber density than the top sheet 30 is used, the liquid migration characteristics from the top sheet 30 to the middle sheet 40 will be excellent. So better. For example, as the intermediate sheet 40, a hot-air nonwoven fabric can be suitably used. It is preferable to use a composite fiber with a core-sheath structure in the hot-air nonwoven fabric. In this case, the resin used as the core may be polypropylene (PP), preferably high-rigidity polyester (PET). The mass per unit area is preferably 17 to 80 g/m ² , more preferably 25 to 60 g/m ² . The thickness of the raw material fiber of the non-woven fabric is preferably 2.0 to 10 dtex. In order to make the non-woven fabric bulky, it is preferable to use eccentric fibers with no central core, hollow fibers, or eccentric and hollow fibers as the mixed fibers of all or part of the raw fibers.

The intermediate sheet 40 illustrated in the figure is shorter than the width of the absorber 70 and arranged in the center, or it may be provided over the entire width. The length in the longitudinal direction LD of the intermediate sheet 40 may be the same as the total length of the diaper, may be the same as the size of the absorber 70, or may be within a relatively short length centered on the liquid-containing area.

(Stand up wrinkles) In order to prevent the lateral movement of excrement on the top sheet 30 and prevent side leakage, it is preferable to provide a standing wrinkle 60 that protrudes from the inner surface of both sides of the product in the width direction WD (stand rise).

The standing wrinkle 60 is composed of a wrinkle sheet 62 and an elongated wrinkle elastic member 63 fixed to the wrinkle sheet 62 in a state of being elongated in the front-rear direction LD. As this corrugated sheet 62, a water-repellent nonwoven fabric can be used, and as the elastic member 63, a rubber thread or the like can be used. In addition to providing a plurality of elastic members on each side as shown in FIGS. 1 and 3, it is also possible to provide one elastic member on each side.

The inner surface of the corrugated sheet 62 has an adhesion starting point in the width direction WD on the side of the top sheet 30, and the part outside the width direction WD from the adhesion starting point is adhered to by a hot melt adhesive or the like The side portion of the liquid-impermeable sheet 11 and the side portion of the non-woven fabric 12 located outside the portion.

In the leg circumference, it is closer to the inner side of the width direction WD than the adhesion starting point of the three-dimensional wrinkle 60, and the two ends in the front and rear direction of the product are fixed to the top sheet 30, and the part in between is a non-fixed free part, this free part It stands up by the contraction force of the elastic member 63. When the diaper is worn, the diaper is in the shape of a boat and is worn on the body, and the contraction force of the elastic member 63 works. Therefore, the contraction force of the elastic member 63 causes the three-dimensional gathers 60 to stand up and close to the leg circumference. As a result, the so-called side leakage from the leg circumference can be prevented.

Unlike the example shown in the figure, it is also possible to fix both ends in the front-rear direction LD in the inner part of the width direction WD of the corrugated sheet 62 in a double-folded state having a base end side portion and a front end side portion, and therebetween The part of the base end portion is made as a non-fixed free part, the base end side portion extends inward from the outer part in the width direction WD, and the front end side portion is folded back to the body side from the end edge of the center side of the base end portion in the width direction WD And extend to the outside of the width direction WD.

(Plane folds) In each side flap SF, as shown in FIGS. 1 to 3, the outer side in the width direction WD near the starting point of adhesion among the adhesion portions of the corrugated sheet 62, and on the corrugated sheet 62 and the liquid-impermeable sheet 11 In between, a leg elastic member 64 made of an elongated elastic member such as a rubber thread is fixed in a state of being stretched in the front-rear direction, whereby the leg portion of each side flap SF is configured as a plane gather. The leg elastic members 64 can also be arranged between the liquid-impermeable sheet 11 and the exterior nonwoven fabric 12 in the side flap SF. In addition to providing a plurality of leg elastic members 64 on each side as shown in the example, it is also possible to provide only one on each side.

(Fastening strap) As shown in Figure 1, Figure 2 and Figure 6, the fastening tape 13 has a sheet base material and a locking portion 13A. The belt main body portion 13B from which the mounting portion 13C protrudes is constituted. The locking portion 13A is provided in the middle part of the belt body portion 13B in the width direction WD of the sheet base material and faces the abdominal side, and is closer to the locking portion 13A The part on the front end side is used as a pinch part. The belt attachment portion 13C of the fastening tape 13 is sandwiched between the corrugated sheet 62 constituting the inner layer and the outer non-woven fabric 12 constituting the outer layer in the side flap SF, and is bonded to by a hot-melt adhesive On these tablets. In addition, the locking portion 13A is fixed to the sheet base by an adhesive.

As the locking portion 13A, a hook material (protruding piece) of a mechanical fastener (hook and loop fastener) is suitable. The hook material has a plurality of engaging protrusions on its outer surface side. As the shape of the engagement protrusion, there are Japanese レ-shaped, J-shaped, mushroom-shaped, T-shaped, double J-shaped (a shape formed by connecting a J-shaped structure back to back), etc., and it may be any shape. Of course, an adhesive material layer can also be provided as the locking portion of the fastening tape 13.

In addition, as a base material for forming the sheet from the belt attachment portion 13C to the belt body portion 13B, in addition to various non-woven fabrics such as spunbonded non-woven fabrics, hot-air non-woven fabrics, and spunlace non-woven fabrics, plastic films, composite laminated non-woven fabrics, and paper can also be used. , Or these composite materials.

(Target piece) It is preferable to provide a target piece 12T at the locking position of the fastening band 13 in the ventral portion F, and the target piece 12T has a target that facilitates the locking. When the locking portion 13A is a hook material, the target sheet 12T can be made of a plastic film or non-woven fabric on the surface of a sheet base material provided with a plurality of loop wires for wrapping the engaging protrusions of the hook material. When the locking portion 13A is an adhesive layer, the target 12T can use a surface that is rich in adhesiveness is to peel off the surface of the sheet substrate composed of a smooth plastic film Processed. In addition, when the locking location of the fastening tape 13 in the ventral portion F is made of non-woven fabric, for example, the case where the exterior non-woven fabric 12 of the illustrated example is made of non-woven fabric, and when the locking portion 13A of the fastening tape 13 In the case of the hook material, the target piece 12T can be omitted, and the hook material can be entangled and locked to the non-woven fabric of the exterior non-woven fabric 12. At this time, the target sheet 12T may be provided between the exterior non-woven fabric 12 and the liquid-impermeable sheet 11.

(Absorber) The absorber 70, as shown in Figs. 1, 3, 5, 15 and 16, is a part that absorbs and retains the liquid component of excrement, and has an auxiliary layer 71 provided on the uppermost part, and is provided on The main absorption layer 72 on the back side of the upper auxiliary layer 71. As described later, it is preferable to have the upper auxiliary layer 71 on the main absorption layer 72, but the upper auxiliary layer 71 may be omitted. FIG. 16 is a diagram separately showing the layer structure of the absorber 70 in FIG. 15 for easy understanding. The absorber 70 can be adhered to members located on at least one side of the surface and the back of the absorber 70 by an adhesive 50h such as a hot melt adhesive.

(Upper auxiliary layer) The upper auxiliary layer 71 has a highly water-absorbent non-woven fabric 42 whose surface is exposed on the top surface of the absorbent body 70 and has a KLEMM water absorption degree of 100 mm or more. This super absorbent non-woven fabric 42 can quickly absorb and diffuse viscous liquid. Therefore, the absorbency of the absorbent body 70 for viscous liquid can be significantly improved. High-absorbent non-woven fabric 42, particularly preferably KLEMM has a water absorption of 130mm or more. In addition, the upper limit of the KLEMM water absorption of the super absorbent non-woven fabric 42 is not particularly limited, but it is preferably about 180 mm, and particularly preferably about 160 mm.

The water retention capacity of the super absorbent nonwoven fabric 42 of the upper auxiliary layer 71 is preferably greater than 0 g and 0.15 g or less, and particularly preferably greater than 0 g and 0.12 g or less. The water retention capacity of the super absorbent nonwoven fabric 42 of the upper auxiliary layer 71 under no load is preferably greater than 0 g and 0.7 g or less, and particularly preferably greater than 0 g and 0.3 g or less.

The raw material and manufacturing method of the super absorbent non-woven fabric 42 are not limited, and it is preferably a wet-type non-woven fabric (especially a wet-type spunlace non-woven fabric). The wet-type non-woven fabric contains more than 50% pulp fibers or rayon fibers and has a mass per unit area of 25%. ~50g/m ² . In addition to fibers other than pulp fibers or rayon fibers, olefin-based, polyester-based, and polyamide-based synthetic fibers such as polyethylene or polypropylene can be used (in addition to single-component fibers, composite fibers such as core and sheath are also included. ). If such a wet-type non-woven fabric is used, the capillary phenomenon generated by the tiny fiber gaps can quickly absorb and diffuse viscous liquid, so it is preferable. In particular, this kind of wet-type non-woven fabric not only has high water absorption by KLEMM, but is also very thin and soft, so it can suppress the decrease in flexibility and increase in thickness of the entire absorbent body 70. The thickness of the super water-absorbent nonwoven fabric 42 is not particularly limited, but in the case of the above-mentioned mass per unit area, it is preferably about 0.13 to 0.48 mm.

In addition, as the super absorbent non-woven fabric 42, as shown in FIG. 18, it is particularly suitable as a non-woven fabric having two or more layers of a support layer 42b and a pulp layer 42a, the support layer 42b containing long fibers of synthetic resin, and the pulp layer 42a is located on the most surface side and is composed of only pulp fibers. Such a highly water-absorbent nonwoven fabric 42 can increase the water absorption of KLEMM by the pulp layer 42a and increase the strength by the presence of the support layer 42b. Therefore, the durability when installed on the uppermost part of the absorbent body 70 is excellent.

If the upper auxiliary layer 71 has the first super absorbent polymer particles 43 adjacent to the back surface of the super absorbent nonwoven fabric 42, as shown by the arrow mark in Figure 17(a), it can absorb and diffuse the super absorbent nonwoven fabric. The latter viscous liquid N is gradually absorbed and retained by the superabsorbent polymer particles adjacent to the back side of the superabsorbent nonwoven fabric 42. Thereby, the absorbability of viscous liquid N can be significantly improved. In particular, if the superabsorbent nonwoven fabric 42 of the upper auxiliary layer 71 is the aforementioned wet nonwoven fabric, the transfer of the viscous liquid N to the first superabsorbent polymer particles 43 adjacent to the back surface thereof becomes smooth, which is preferable.

The size and arrangement of the super absorbent nonwoven fabric 42 of the upper auxiliary layer 71 can be appropriately determined. For example, as shown in the example of the figure, the super absorbent non-woven fabric 42 can also be configured to cover the entire surface of the main absorbent layer 72, or it can be configured to cover only a part of the surface of the main absorbent layer 72, such as the front end, the rear end, the center or Multiple locations among these. In addition, the super absorbent nonwoven fabric 42 may have a portion protruding from the periphery of the self-absorbent layer 72, and a part or all of the periphery of the super absorbent nonwoven fabric 42 may be farther from the central side than the periphery of the main absorbent layer 72. Normally, it is desirable that the super absorbent non-woven fabric 42 of the upper auxiliary layer 71 covers more than 90% of the area of the main absorbent layer 72.

The size and arrangement of the region having the first superabsorbent polymer particles 43 can be appropriately specified. For example, as shown in the example of the figure, the first super absorbent polymer particles 43 can also be arranged in the entire area where the super absorbent non-woven fabric 42 overlaps the main absorbent layer 72, or can be placed in the super absorbent non-woven fabric 42 overlaps the main absorbent layer 72. In a part of the area, for example, the front end, the rear end, the center, or a plurality of locations among these. Normally, it is desirable to have the area of the first super absorbent polymer particles 43 occupying more than 83% of the area of the main absorbent layer 72.

The first superabsorbent polymer particles 43 may not be fixed to the superabsorbent non-woven fabric 42, more preferably be fixed thereon. The first super absorbent polymer particles 43 can be adhered to the super absorbent nonwoven fabric 42 by, for example, an adhesive 42h such as a hot melt adhesive coated on the back surface of the super absorbent nonwoven fabric 42 in an intermittent pattern.

The first superabsorbent polymer particles 43 may not be fixed to only contact the surface of the main absorbent layer 72, or may be fixed. For example, after the adhesive 43h such as a hot melt adhesive is coated on the surface of the main absorbent layer 72 in an intermittent pattern, the first superabsorbent polymer particles 43 can be spread on the coated portion, and further The super absorbent non-woven fabric 42 is arranged thereon with or without the adhesive 42h.

The mass per unit area of the first superabsorbent polymer particles 43 can be appropriately defined. If it is assumed to be muddy feces, watery feces, or liquid components in soft feces, a small amount of viscous liquid that needs to be absorbed at once is required. It is preferably 50 to 150 g/m ² , particularly preferably 50 to 100 g/m ² . If the mass per unit area of the first superabsorbent polymer particles 43 is less than 50 g/m ² , even a small amount of viscous liquid may not be absorbed sufficiently. Moreover, if the mass per unit area of the first superabsorbent polymer particles 43 exceeds 150 g/m ² , when a large amount of non-viscous liquid such as urine is to be absorbed, the first superabsorbent polymer particles 43 are sufficiently absorbing After swelling, gel clogging will occur, and the possibility of obstructing the supply of non-viscous liquid to the main absorbent layer 72 will increase. On the other hand, if it is within the above range, even after the first superabsorbent polymer particles 43 are sufficiently absorbed and swelled, there are still parts where gel clogging does not occur, and it is possible to ensure that the non-viscous liquid is supplied to the main body. The absorption layer 72 is therefore preferable.

(Main absorption layer) For the main absorbent layer 72, a cell absorbent sheet 50 as shown in the example can be used. The cell absorbent sheet 50 has a plurality of cells 55 (cells) surrounded by a liquid-permeable top sheet 51 and a bottom The sheet 52 is surrounded by the junction 54 and the upper sheet 51 and the lower sheet 52 are not joined; and, the powder or granule, which contains the second superabsorbent polymer particles 53 contained in the cell 55. The absorption performance of the cell absorbent sheet 50 depends on the second superabsorbent polymer particles 53, so it will inevitably become a sheet with a slower absorption speed and low absorption for viscous liquid N. Therefore, when the cell absorbent sheet 50 is used as the main absorbent layer 72, the aforementioned upper auxiliary layer 71 has a special significance.

The cell absorbent sheet 50 will be described in further detail. As shown in enlargement of Figures 7 and 15, this cell absorption sheet 50 has: an upper sheet 51; a lower sheet 52, which is arranged on the back side of the upper sheet 51; The non-joining part of the upper sheet 51 and the lower sheet 52 is surrounded by the joint 54 of the upper sheet 51 and the lower sheet 52; and, the second superabsorbent polymer particles 53 are contained in this cell 55. A large number of cells 55 are arranged so as to correspond to the width of the junction 54 at intervals. In this way, a large number of cells 55 are surrounded by the joints 54 and the second superabsorbent polymer particles 53 are distributed and held in the cells 55, thereby preventing absorption of the sheet in the cells. The distribution of the second superabsorbent polymer particles 53 in 50 is not uniform.

In order to facilitate the placement of the second superabsorbent polymer particles 53 during manufacture and to ensure the volume after absorption and expansion, it is preferable that at least one of the upper sheet 51 and the lower sheet 52 in the cell 55 is in the unfolded state in the cell. The outer side of 55 is a recessed portion 50c that is depressed, and the recessed portion 50c may not be provided, and the second superabsorbent polymer particles 53 may only be sandwiched between the upper sheet 51 and the lower sheet 52.

The recess 50c can be formed by performing shaping processing such as embossing processing on the target sheet. Moreover, by this embossing process, the convex part 50p which swells outward is formed in the part located in each cell 55 in the target sheet. That is, if the recessed portion 50c is formed in the upper sheet 51 by embossing, the portion of the upper sheet 51 located in each cell 55 is pushed upward to form a convex portion 50p that swells upward. The depth 50d of the recess 50c is not particularly limited, but is preferably 1.0 to 7.0 mm, particularly preferably about 1.0 to 5.0 mm.

Here, when absorbing non-viscous liquid U such as urine, if the 71 first superabsorbent polymer particles 43 of the upper auxiliary layer are set in the same state, the first superabsorbent polymer particles 43 will preferentially absorb The first superabsorbent polymer particles after swelling will adhere closely to form an impermeable layer, which is prone to gel clogging, which may make it difficult for the non-viscous liquid U to be supplied to the main absorbent layer 72. That is, the upper auxiliary layer 71 may hinder absorption by the main absorption layer 72. On the other hand, as shown in FIG. 15, the portion of the top surface of the top sheet 51 located in each cell 55 becomes a convex portion 50p swollen on the upper side, and the first superabsorbent polymer particles 43 are fixed to the main The top surface of the top sheet 51 of the absorbent layer 72, the adhesion amount (mass per unit area) of the first superabsorbent polymer particles 43 on the top surface of the top sheet 51, is located as the top surface of the convex portion 50p faces The more the bottoms of the valleys between the adjacent convex parts 50p, the more the first superabsorbent polymer particles 43 fixed on the top surface of the top sheet 51 as shown in FIG. 17(a) can be effectively used For the absorption of viscous liquid N, and compared with the same amount of the first superabsorbent polymer particles, as shown in Figure 17(b), when the non-viscous liquid U is absorbed, even the first superabsorbent After the polymer particles 43 are sufficiently absorbed and swelled, the portion where the adhesion amount of the first superabsorbent polymer particles 43 is smaller is less likely to cause gel clogging, and the supply of the non-viscous liquid U to the main absorbent layer 72 is less likely to be hindered. In addition, by using the convex portions 50p of the top sheet 51, it is possible to easily apply regular changes to the adhesion amount of the first superabsorbent polymer particles 43 on the top surface of the top sheet 51 (repetitively set the portion with a large amount of adhesion) And the part with a small amount of adhesion). That is, as mentioned above, if the hot-melt adhesive is applied on the surface of the main absorbent layer 72 in an intermittent pattern, and then the first superabsorbent polymer particles 43 are spread on the coated portion, the The dispersion is uniform, and the first superabsorbent polymer particles 43 will easily roll down toward the bottom of the valley due to gravity. Therefore, the adhesion amount of the first superabsorbent polymer particles 43 will naturally become as self-convex. The more the top of the portion 50p goes toward the bottom of the valley located between the adjacent convex portions 50p. Thereby, the uneven adhesion structure of the first superabsorbent polymer particles 43 seems to be a complicated structure, but it is relatively easy to manufacture. In addition, needless to say, in this case, the mass per unit area of the first superabsorbent polymer particles 43 is preferably within the aforementioned range.

The adhesion amount of the first superabsorbent polymer particles 43 on the top surface of the top sheet 51 may increase as the top of the convex portion 50p goes toward the bottom of the valley between the adjacent convex portions 50p. , The first superabsorbent polymer particles 43 may not be attached to a part of the top portion including the convex portion 50p, and the first superabsorbent polymer particles 43 may be attached only to the other parts, or it may be as shown in the example. The first superabsorbent polymer particles 43 are attached to almost the entire top portion including the convex portion 50p and other portions, and the amount of attachment continuously (or stepwise) increases toward the bottom of the valley portion.

The size of the convex portion 50p can be appropriately specified. From this point of view, the size 55L of the convex portion 50p of the top sheet 51 in the front-rear direction LD is preferably 6 to 30 mm, and the size 55W of the width direction WD of the convex portion 50p of the top sheet 51 is more It is preferably 7-50 mm, the width 54W of the joining part 54 is preferably 1.0-1.8 mm, and the depth 50d of the valley part of the top sheet 51 (the height of the convex part 50p) is preferably 1.0-7.0 mm.

If the concave portion 50c is provided on the top sheet 51, a convex portion 50p will be formed on the top surface of the top sheet 51 and will not easily adhere to the super absorbent non-woven fabric 42 of the upper auxiliary layer 71 (a gap is likely to occur), which may hinder the self-high absorbent non-woven fabric 42 The transfer of the viscous liquid N toward the first superabsorbent polymer particles 43. Therefore, from this point of view, as shown in FIG. 13(c), it is preferable not to form the concave portion 50c on the upper sheet 51 (that is, to have a flat top surface without shaping processing), and to have a flat top surface on the lower sheet 52. A part of the cell 55 forms a recess 50c. Thereby, the expansion volume of the second superabsorbent polymer particles 53 is ensured by the recess 50c of the lower sheet 52, and the top surface of the upper sheet 51 and the first superabsorbent polymer particles 43 arranged there easily It is in close contact with the super absorbent nonwoven fabric 42 of the upper auxiliary layer 71 and becomes an absorbent article that is not easy to hinder the transfer of the viscous liquid N from the super absorbent nonwoven fabric 42 to the first super absorbent polymer particles 43.

On the other hand, as shown in FIG. 7(b) and FIG. 13(a), etc., it is preferable that between the upper sheet 51 and the lower sheet 52, there is a middle sheet 80 made of a non-woven fabric. It may also be shown in FIG. 14( As shown in b), the middle piece 80 is not provided. When the middle piece 80 is provided, the three layers of the upper piece 51, the middle piece 80, and the lower piece 52 are joined in the joining portion 54. In addition, the middle sheet 80, preferably its part located in the junction 54 is compressed in the thickness direction, and the part located in the cell 55 expands into the recess 50c (in other words, the fiber density is farther from the junction 54). Lower). Thereby, the pressure applied in the packaging state of the product or the pressure applied during wearing does not easily crush the concave portion 50c (and therefore does not easily crush the convex portion), and even if crushed, the elasticity of the middle sheet 80 is It will promote the restoration of the shape to at least the part where the middle piece 80 enters or the volume close to this part. In addition, the super absorbent polymer will expand the fiber gap of the middle sheet 80 and enter it when absorbing the excrement, and may be because the middle sheet 80 can be easily compressed, or it may be because the middle sheet 80 is compressed and enters its fibers. The gap expands, so the presence of the middle sheet 80 does not easily hinder the expansion of the second superabsorbent polymer particles 53. Furthermore, the fibers of the middle sheet 80 expanded in the recessed portion 50c can ensure a liquid flow path to each of the second superabsorbent polymer particles 53, so that diffusion can be suppressed even after the second superabsorbent polymer particles 53 start to swell The decrease in performance makes gel clogging less likely to occur. Therefore, by these synergistic effects, the absorption speed of the disposable diaper equipped with the cell absorbent sheet 50 can be improved (especially in the initial stage of absorption).

The top sheet 51 is not particularly limited, as long as it is the same liquid-permeable material as the top sheet. The top sheet 51 will affect the absorption rate, so the top sheet is made of hydrophilic fibers, especially dry non-woven fabrics made of natural fibers such as cotton and pulp. Among them, an airlaid pulp nonwovens (airlaid pulp nonwovens) whose pulp is 70% is particularly suitable. Weight% or more (when the remaining amount is less than 100% by weight, the remaining amount is set to be an appropriate synthetic fiber). The fiber bonding method of the nonwoven fabric is not particularly limited. In order to prevent the detachment of the second superabsorbent polymer particles 53, the bonding method that can increase the fiber density such as spunbonding, melt spraying, and needle punching is preferred. In addition, the fineness, mass per unit area, and thickness of the nonwoven fabric are preferably about 2.0 to 7.0 dtex, about 18 to 50 g/m ² , and about 0.10 to 0.60 mm, respectively. When a porous plastic sheet is used, in order to prevent the detachment of the second superabsorbent polymer particles 53, the pore size of the plastic sheet is preferably smaller than the outer shape of the second superabsorbent polymer particles 53. Moreover, when the raw material of the top sheet 51 has hydrophobicity, it can also contain a hydrophilic agent.

Preferably, the bottom sheet 52 is a high-absorbent non-woven fabric, and the high-absorbent non-woven fabric has a KLEMM water absorption of 50 mm or more, a water retention capacity of 0.1 g or more under load, and a water retention capacity of 0.5 g or more under no load. As shown in FIG. 17(b), the non-viscous liquid U such as urine supplied to the cell absorbent sheet 50 can be absorbed by the second superabsorbent polymer particles 53 in the cell absorbent sheet 50, and there is no The non-viscous liquid U that has been absorbed by the second superabsorbent polymer particles 53 and reached the lower sheet 52 is absorbed by the lower sheet 52, retains water in the lower sheet 52 and diffuses, and then is absorbed by the cell absorption sheet 50. The second superabsorbent polymer particles 53 are sucked up. Here, the cell absorbent sheet 50 does not have the junction 54 of the second superabsorbent polymer particles 53 and continuously extends toward the periphery of the cell absorbent sheet 50. When the cell absorbent sheet 50 has convex portions 50p on the back surface , The gap between the back surface of the cell absorbent sheet 50 and the opposing surface also continuously extends toward the periphery of the cell absorbent sheet 50. Therefore, if the water retention capacity of the cell absorbent sheet 50 is low, the non-viscous liquid U that has passed through the cell absorbent sheet 50 may move on the liquid impermeable sheet 11 and leak out from the periphery of the absorbent body 70 to the skin side. Adhere to the skin or leak.

It is particularly preferable that the water absorption of KLEMM of the super absorbent non-woven fabric constituting the bottom sheet 52 is 70 mm or more. In addition, the upper limit of the KLEMM water absorption of the high water-absorbent non-woven fabric constituting the bottom sheet 52 is not particularly limited, and it is preferably about 150 mm, and particularly preferably 100 mm. It is particularly preferable that the water retention capacity of the super absorbent non-woven fabric constituting the lower sheet 52 is 0.13 g or more under load. In addition, the upper limit of the amount of water retention under load of the super absorbent nonwoven fabric constituting the lower sheet 52 is not particularly limited, but it is preferably about 0.30 g, and particularly preferably 0.26 g. It is particularly preferable that the water retention capacity of the super absorbent non-woven fabric constituting the lower sheet 52 is 0.70 g or more under no load. In addition, the upper limit of the water retention capacity under no load of the super absorbent nonwoven fabric constituting the lower sheet 52 is not particularly limited, but is preferably about 1.40 g, and particularly preferably 1.20 g.

The raw material and manufacturing method of the super absorbent nonwoven fabric constituting the lower sheet 52 are not limited, and the super absorbent nonwoven fabric 42 similar to the upper auxiliary layer 71 can be suitably used. When the junction 54 of the upper sheet 51 and the lower sheet 52 is formed by welding, the super absorbent nonwoven fabric constituting the lower sheet 52 is suitably heat-fusible fibers such as polyethylene fibers or composite fibers containing polyethylene components. In particular, the purpose of the lower sheet 52 is to temporarily store a non-viscous liquid U such as urine, so it is preferably a sheet having a higher water retention capacity than the super absorbent non-woven fabric 42 of the upper auxiliary layer 71. For example, the water retention capacity of the high water absorption nonwoven fabric constituting the lower sheet 52 is preferably 2 to 4 times that of the high water absorption nonwoven fabric 42 of the upper auxiliary layer 71 under load. More specifically, the mass per unit area of the super absorbent nonwoven fabric constituting the lower sheet 52 can be set to 1.2 to 1.8 times the mass per unit area of the super absorbent nonwoven fabric 42 of the upper auxiliary layer 71, or a plurality of sheets and the upper The super absorbent nonwoven fabric equivalent to the auxiliary layer 71 is used as the super absorbent nonwoven fabric constituting the lower sheet 52.

If the top sheet 51 has the recessed portion 50c, the surface area of the top sheet 51 becomes larger, and the liquid can be supplied to the superabsorbent polymer particles in the cell absorbent sheet 50 in a wider range, which is preferable. On the other hand, if the lower sheet 52 has the recessed portion 50c, the surface area of the lower sheet 52 becomes larger. Compared with the case where the lower sheet 52 is flat without shaping, the lower sheet 52 has more water retention, which is preferable.

The non-woven fabric of the middle sheet 80 is not particularly limited, but the fineness of the constituent fibers of the non-woven fabric is preferably about 1.6 to 7.0 dtex, more preferably 5.6 to 6.6 dtex. In addition, the porosity of the non-woven fabric of the middle sheet 80 is preferably 80 to 98%, more preferably 90 to 95%. If the fineness and porosity of the middle sheet 80 are within this range, the elasticity of the middle sheet can be ensured as much as possible, and the second superabsorbent polymer particles 53 can be easily absorbed before and during the absorption of excrement fluid. The ground enters the fiber gap of the middle sheet 80. Therefore, the fibers of the middle sheet 80 that expand in the recessed portion 50c during absorption can ensure a liquid flow path to each of the second superabsorbent polymer particles 53, so even after the second superabsorbent polymer particles 53 start to swell Suppress the decrease of diffusibility, and make gel clogging less likely to occur. Considering the depth 50d of the recessed portion 50c or the degree of penetration into the recessed portion 50c, etc., the thickness of the middle sheet 80 can be appropriately specified. The thickness is preferably 10% to 90% of the depth 50d of the recessed portion 50c, and more preferably 70% to 90%. %. The mass per unit area of the middle sheet 80 can also be appropriately determined for the same reason, and in the case of the above-mentioned thickness range, it is preferably set to about 25 to 40 g/m ² . In order to increase the porosity of the nonwoven fabric of the middle sheet 80 (to widen the fiber gap), it is preferable that the constituent fibers be crimped fibers. In addition, if the constituent fibers of the nonwoven fabric of the middle sheet 80 are hydrophilic fibers (including fibers that are hydrophilic by a hydrophilic agent), water retention can be improved, and if they are hydrophobic fibers, diffusibility can be improved. The fiber bonding method of the non-woven fabric is not particularly limited. In order to increase the porosity (widen the fiber gap) and fully bond the fibers to ensure elasticity, the middle sheet 80 is preferably a hot-air non-woven fabric in which the fibers are bonded by hot-air heating.

The side of the middle piece 80 facing the recess 50c only needs to enter the recess 50c, as shown in Figs. 13(a), 13(c), and 14(a) and 14(c), respectively. It is preferable to contact the inner surface of the recess 50c, and it may be separated as shown in FIG. 13(b). When the surface of the middle sheet 80 facing the recess 50c is separated from the inner surface of the recess 50c, the separation distance 80s can be appropriately defined, and it is preferably set to 30% or less of the depth 50d of the recess 50c. In this way, when a gap is generated in the cell 55, the convex portion 50p (concave portion 50c) in the product state can be crushed corresponding to the gap.

The middle sheet 80, as shown in Figs. 13(a) to 13(c) and Fig. 14(a), may also be covered by an adhesive 80h in both the cell compartment 55 and the junction 54 It is adhered to at least one of the upper sheet 51 and the lower sheet 52, as shown in FIG. 14(c), and none of the upper sheet 51 and the lower sheet 52 may be adhered.

Almost all of the second superabsorbent polymer particles 53 (for example, 95% or more) are set to be non-fixed with respect to the upper sheet 51, the lower sheet 52, and the middle sheet 80, and are preferably set to be freely movable. However, a part or almost all of the second superabsorbent polymer particles 53 (for example, 95% or more) can also be bonded or adhered to at least one of the upper sheet 51, the lower sheet 52, and the middle sheet 80. Fig. 14(b) shows an example in which a part of the second superabsorbent polymer particles 53 is bonded to the lower sheet 52 by an adhesive 53h such as a hot melt adhesive. In addition, the second superabsorbent polymer particles 53 may be agglomerated to a certain extent. Especially when the second superabsorbent polymer particles 53 can move freely in the cell 55, if there is a hollow part in the cell 55, the second superabsorbent polymer particle 53 will move in the cell 55 during use. , Sound may be emitted, or gel clogging may occur due to uneven distribution of the second superabsorbent polymer particles 53 in the cell 55. Therefore, in order to solve these problems, the surface of the middle sheet 80 opposite to the recess 50c is brought into contact with the inner surface of the recess 50c, that is, in other words, almost the entire cell 55 including the recess 50c The fiber filled with the middle sheet 80 with high porosity is a preferred form. Thereby, the second superabsorbent polymer particles 53 are caught by the fibers of the middle sheet 80, or are pressed onto the upper sheet 51 or the lower sheet 52, or both of them, so they are not easy to move freely. Therefore, it is possible to prevent hindering the expansion of the second superabsorbent polymer particles 53, and prevent the sound generated by the movement of the second superabsorbent polymer particles 53 and the second superabsorbent in the cell 55. The distribution of the polymer particles 53 is uneven, which hinders absorption.

13(a), 13(b), and 14(c), if the second superabsorbent polymer particles 53 are present on the top surface of the middle sheet 80 at most, and face from there When the lower side is reduced, when the user touches the outer surface of the diaper with his hand, the small particles of the second superabsorbent polymer particles 53 rub (produce a rustling sound) because of the middle sheet 80 interposed between them. It’s better to pass it to your hand. Especially when the middle sheet 80 is a very bulky non-woven fabric with a high porosity, the second superabsorbent polymer particles 53 can enter the fiber gaps of the middle sheet 80 before and during the absorption of excrement fluid, so the absorption is further improved. speed. That is, at the initial stage of absorption, absorption is performed on the top surface of the middle sheet 80, and the second superabsorbent polymer particles 53 are mostly distributed on the top surface, but the absorption speed is limited. Therefore, in the initial stage of absorption, most of the excreted fluid will also enter the middle sheet 80 with a small amount of the second superabsorbent polymer particles 53, and the second superabsorbent polymer particles 53 in the middle sheet 80 will absorb and temporarily It is stored until it is absorbed by the second superabsorbent polymer particles 53 or diffused into the surrounding cells 55. The excreted fluid after being diffused around is absorbed by the second superabsorbent polymer particles 53 in the middle sheet 80 existing there, or by the second superabsorbent which mostly exists above the middle sheet 80 The polymer particles 53 are sucked up. Also, in the process in which each of the second superabsorbent polymer particles 53 gradually absorb the excrement liquid, the superabsorbent polymer particles expand the fiber gap and enter the fiber gap, or expand and compress the middle sheet 80. Due to this absorption mechanism, the excretion will quickly diffuse into the wide area of the cell absorbent sheet 50 and be sucked into the cell absorbent sheet 50, so of course the absorption speed will be increased and the back seepage will be prevented. The sex has also become excellent. Moreover, in order to make good use of this absorption mechanism, it is preferable to form the recessed part 50c in the part which comprises each cell 55 in the upper sheet 51 at least.

The degree of distribution of the second superabsorbent polymer particles 53 in the cell 55 can be appropriately determined. In general, it is preferably the weight of the second superabsorbent polymer particles 53 present on the top surface of the middle sheet 80 The ratio is more than 50% of the total, and the weight ratio of the superabsorbent polymer particles held in the middle sheet 80 (that is, not on the lower sheet 52) is more than 45% of the total.

Of course, the degree of distribution of the second superabsorbent polymer particles 53 in the cell 55 is not limited to this. Therefore, if importance is attached to the suckability of the super absorbent non-woven fabric constituting the bottom sheet 52, it is also preferable that as shown in FIG. 13(c), the second super absorbent polymer particles 53 are most present on the top surface of the bottom sheet 52 , And distributed decreasingly from there toward the upper side. 14(a), the amount of the second superabsorbent polymer particles 53 present on the top surface of the middle sheet 80 and the top surface of the lower sheet 52 may be higher than that of the middle sheet 80 and The parts between the lower pieces 52 are more distributed. Further, although not shown in the figure, the second superabsorbent polymer particles 53 can also be present at most in the middle of the thickness direction of the middle sheet 80, and distributed from there to the upper side and the lower side in a reduced manner. In this form, the middle sheet 80 can be made into a two-layer non-woven fabric, and the second superabsorbent polymer particles 53 can be formed by sandwiching the two layers.

The mass per unit area of the second superabsorbent polymer particles 53 can be appropriately determined. In the absorbent body 70 of this example, the upper auxiliary layer 71 contains the first superabsorbent polymer particles 43, so the mass per unit area of the second superabsorbent polymer particles 53 in the main absorbent layer 72 can be suppressed to It is less, but only the upper auxiliary layer 71 is responsible for the absorption of a relatively large amount of excretion fluid such as urine. Therefore, although it is impossible to generalize, the mass per unit area of the second superabsorbent polymer particles 53 is preferably greater than the mass per unit area of the first superabsorbent polymer particles 43, for example, it can be set to 150-250 g/ m ² . Generally speaking, the mass per unit area of the second superabsorbent polymer particles 53 is less than 150 g/m ^{2 and} it is difficult to ensure the absorption. If it exceeds 250 g/m ² , when the user touches the outer surface of the product with his hand , The tactile sensation (unharmonious sensation) of the small particles of the second superabsorbent polymer particles 53 rubbing (generating rustling sound) is easily transmitted to the hand.

The planar shape of the cell 55 can be appropriately defined. It can be hexagonal, rhombic, square, rectangular, circular, elliptical, etc., as shown in FIG. The illustration is arranged so that there are no gaps. In addition to arranging the cells 55 in the same shape and the same size, although not shown in the figure, it is also possible to combine and arrange a plurality of kinds of cells 55 different in at least one of the shape and the size.

The plane arrangement of the cells 55 (that is, the assembly part of the second superabsorbent polymer particles 53 is also the same) can be appropriately defined, and is preferably a regular and repeated plane arrangement, except for the oblique arrangement shown in FIG. 12(a) Square lattice shape, hexagonal close-packed (hcp) shape as shown in Fig. 12(b) (these are also called staggered shapes), square lattice shape as shown in Fig. 12(c), as shown in Fig. 12(c) d) rectangular grid shape as shown in Figure 12 (e) parallel body grid (as shown in the figure, set as a form of two groups such that a large number of groups of parallel diagonal rows cross each other), etc. (These include grids inclined at an angle of less than 90 degrees with respect to the direction of expansion and contraction.) In addition to the regular and repeated arrangement, the group of cells 55 (the arrangement of the group unit may be regular or irregular. It can also be a pattern or a character shape, etc.) It can also be made into a group that repeats regularly.

The size of each cell 55 can be appropriately defined. For example, the size of the front-rear direction LD can be set to 55L (equivalent to the size of the convex portion 50p in the front-rear direction LD), which can be about 6 to 30 mm, and the size of the width direction WD is 55W. (The dimension equivalent to the width direction WD of the convex part 50p) can be set to about 7-50 mm. The area of each cell 55 can be about 31 to 1650 mm ² .

It is desirable to join the joint 54 of the upper sheet 51 and the lower sheet 52 by ultrasonic welding or heat sealing by welding the upper sheet 51 and the lower sheet 52, or may be joined by a hot melt adhesive. .

The junction 54 of the upper sheet 51 and the lower sheet 52 is only required to be arranged to surround each cell 55 and become a boundary between adjacent cells, except that it is formed in a dotted line shape (in the surrounding In addition to being discontinuous in the direction of each cell 55), it can also be formed in a continuous line shape. When the junction 54 is formed intermittently, it is preferable that there is no second superabsorbent polymer particle 53 or less than the inside of the cell 55 between the junction 54 in the direction surrounding the cell 55 . In particular, if the joint is provided in a dot-line shape (intermittent), the fiber group of the middle sheet will pass between the adjacent joints and extend across a large number of cells. Therefore, a liquid diffusion path is formed between the adjacent junctions, so the diffusibility of the liquid across the cells is improved, thereby achieving an improvement in the absorption speed.

As shown in FIG. 10, the bonding portion 54 may be a weak bonding portion 54b that can be peeled off due to the expansion force of the second superabsorbent polymer particles 53 in the adjacent cell 55, or it may be basically not. The strong junction 54a is peeled off by the expansion force of the second superabsorbent polymer particles 53 in the adjacent cell 55. In order to also correspond to the expansion of the second superabsorbent polymer particles 53 having the volume of each cell 55 or more, it is preferable that a part or all of the joint part 54 is a weak joint part 54b. By having the weak junction 54b, the adjacent cells 55 sandwiching the weak junction 54b can be peeled off and combined into one by the absorption of the expansion pressure of the second superabsorbent polymer particles 53 in the cell 55 Large cell compartment 55.

On the other hand, the strong junction part 54a is basically a part that does not peel off even if the cells 55 on both sides absorb and expand. Therefore, it is continuous in a specific direction to improve diffusibility and prevent the second highest. The flow of the gelled substance of the absorbent polymer particles 53 reduces the contact area on the surface side and other effects. Therefore, by combining the strong junction part 54a and the weak junction part, it is possible to construct a cell absorbent sheet 50 which has various features described later. In addition, if the junction 54 located on the outermost side in the width direction WD peels off here, the second superabsorbent polymer particles 53 or its gel may leak to the side of the cell absorbent sheet 50, so it is desirable to make it strong接部54a. From the same point of view, the upper sheet 51 and the lower sheet 52 are extended to some extent in the width direction WD than the cell 55 formation area. In order to reinforce this extended portion, it is preferable to implement an edge joint portion 54c.

The difference in bonding strength can also be simply formed by changing the area of the bonding portion 54, but it is not limited to this. For example, when the bonding portion 54 is formed by a hot melt adhesive, a method can also be used. The method of changing the type of hot-melt adhesive based on the position. In particular, when the joint 54 is formed by welding the upper piece 51 and the lower piece 52, it is also possible to form the weak joint 54b only by making the joint 54 a dot-line shape and widening the dot interval 54D, but the joint The part 54 is the part that becomes the boundary between the adjacent cells 55. Therefore, if the dot spacing 54D is too wide, the gap between the adjacent cells 55 will increase, making the second superabsorbent polymer particles 53 easier. move. Therefore, if the dot-line weak joint 54b is formed by combining the width 54W of the joint 54 and the dot spacing 54D, the weak joint 54b becomes a joint with little gap but easy to peel off.

The size of the junction 54 that joins the upper sheet 51 and the lower sheet 52 can be appropriately defined, for example, the width (the size in the direction orthogonal to the direction surrounding the cell 55, which is equal to the interval between the cells 55) 54W can be set to 1.0 to About 1.8mm. Moreover, when the junction 54 is formed in a dotted line shape (the direction surrounding the cell 55 is intermittent), it is preferable that the size 54L of the junction 54 in the direction surrounding the cell 55 is set to 0.6 to 1.5 mm. The point interval 54D is set to be about 0.8 to 3.0 mm. Particularly in the case of the strong junction portion 54a, it is preferable that the width 54W is set to approximately 1.3 to 1.8 mm, the size 54L of the junction portion 54 is set to approximately 1.0 to 1.5 mm, and the dot interval 54D is set to approximately 0.8 to 2.0 mm. . In the case of the weak joint 54b, it is preferable that the width 54W is set to approximately 1.0 to 1.3 mm, the size 54L of the joint 54 is set to approximately 0.6 to 1.0 mm, and the dot interval 54D is set to approximately 1.5 to 3.0 mm. .

In order to make the weak junction 54b peelable, the volume of the second superabsorbent polymer particles 53 in the cell 55 at the time of saturation absorption can be made sufficiently larger than the volume of the cell 55 adjacent to the weak junction 54b. The type and amount of the second superabsorbent polymer particles 53 arranged in each cell 55 are regulated in a larger way. In addition, in order to prevent the strong junction 54a from being peeled off basically, the volume of the cell 55 that can be combined due to the peeling of the weak junction 54b can be made to be contained in the cell 55 that can be combined. The type and amount of the second superabsorbent polymer particles 53 arranged in each cell 55 are defined in such a way that the volume at the time of saturation absorption of the second superabsorbent polymer particles 53 is smaller.

The width of the junction 54 when the junction 54 is formed in a continuous line shape and the width 54W of the junction 54 when the junction 54 is formed in a dotted line shape are fixed in the direction surrounding the cell 55 , Can also be changed. In addition, the shape of each joint 54 when the joint 54 is formed into a dot-line shape can be appropriately specified, and in addition to all being the same, the shape may be different depending on the location. In particular, when the shape of each cell 55 is a polygonal shape, it is preferable to provide the junction 54 at at least one of the middle position of each side and each vertex position. In the case of the strong junction portion 54a, it is preferable to also be provided at each vertex position, while in the case of the weak junction portion 54b, not providing the weak junction portion 54b at each vertex position will easily peel off the weak junction portion 54b and make the cell 55 assemble smoothly. So it’s better.

As shown in Figs. 8 and 11, it is preferable to provide a strong joining portion 54a in the middle region in the width direction WD of the cell absorbent sheet 50 with a longitudinal strong joining line 58 continuous in the front-rear direction LD, and an adjacent On both sides of the longitudinal strong joining line 58 are diffusibility lifting parts 57 composed of low-expansion cells 55s. Compared with the cells 55 adjacent to both sides of the diffusible lifting part 57, the second superabsorbent polymer particles 53 of the low-expansion cell 55s of the diffusible lifting part 57 have a smaller amount of inner packaging per unit area. And the junction part 54 between the cells 55 adjacent to both sides of this diffusibility promotion part 57 becomes a weak junction part 54b. At this time, as shown in FIG. 10, at the beginning of the absorption of the excrement, due to the difference in the amount of expansion between the diffusible lifting portion 57 and its surrounding parts, a wide groove with the diffusible lifting portion 57 as the bottom is formed, and the groove To promote liquid diffusion. In this state, the expansion force of the second superabsorbent polymer particles 53 in the cells 55 around the diffusible lifting part 57 continues to expand to the low expansion cell 55s of the diffusible lifting part 57 and the cells on both sides thereof. The weak joint 54b between the chambers 55 is loose. Since the strong joint 54a will not loosen after the weak joint 54b is loosened, the width of the groove is narrowed but a groove with the strong joint 54a as the bottom remains. And maintain diffusivity. In other words, at the initial stage of absorption where the diffusion of a large amount of excretion fluid becomes important, the width of the groove is large, and thereafter, the low-expansion cell 55s of the diffusibility promotion part 57 is also connected with the surrounding cells so as not to cause gel clogging. The chamber 55 is integrated, but grooves remain due to the strong junction 54a to maintain the diffusibility improvement effect.

The amount of the second superabsorbent polymer particles 53 contained in the low-expansion cell 55s, calculated by weight ratio, is preferably 1/3 or less of the adjacent cell 55, and it is particularly preferred that it is not contained at all.

In addition, in FIG. 11, the strong joint 54a is represented by a thick dotted line, and the other weak joint 54b is represented by a thin dotted line. In FIG. 11, the cell containing the second superabsorbent polymer particle 53 55 (that is, the cell 55 except for the low-expansion cell 55s and the empty cell 56 described later) is attached with a diagonal line pattern.

The diffusibility lifting part 57, as shown in FIG. 8, may also be provided over the entire length of the cell absorbent sheet 50, as shown in FIG. All over its front and back sides). In addition, the diffusibility lifting portion 57, as shown in FIGS. 8 and 11, is provided in a place in the center of the width direction WD. Although not shown, it can also be provided at intervals in the width direction WD. Of multiple premises.

If the cells 55 of the LD covering the entire front and rear directions of the cell absorbent sheet 50 can be combined, the gelled product of the second superabsorbent polymer particles 53 after swelling becomes a cell that can be combined during absorption. The inside of 55 moves largely in the front-rear direction LD, and this gelatinous product may gather at low places such as the crotch and deteriorate the wearing feeling. Therefore, as shown in FIG. 8, a preferred form is to provide a plurality of lateral strong joining lines 59 at intervals in the front-rear direction LD. The lateral strong joining lines 59 (refer to FIG. The direction WD is a continuous or discontinuous (continuous line or dotted line) continuous portion or diagonally upward. Thereby, it is possible to prevent the gelled product of the second superabsorbent polymer particles 53 from moving in the front-rear direction LD by the strong joining portion 54a that hardly peels off during absorption, thereby preventing the cell absorbent sheet 50 from moving The shape collapsed. Of course, as shown in FIG. 11, it is also possible to make a form without such a lateral strong joining line 59.

In particular, as shown in FIG. 8, if the strong joining portion 54a extends over the entire length of the cell absorbent sheet 50 in the front-rear direction LD, that is, the longitudinal strong joining line 58, which is located along the outermost side in the width direction WD The side edges of the cell chamber 55 are respectively arranged on both sides of the width direction WD, and are also arranged in the middle of the width direction WD of these longitudinal strong joint lines 58, and the transverse strong joint lines 59 are opposite to each other in the width direction WD. The way between adjacent longitudinal strong joint lines 58 is continuous in the width direction WD or diagonally upwards, the unity of the cells 55 will not exceed the most enlarged area 55G surrounded by the strong joint part 54a, so the absorption At this time, the gelled product of the expanded second superabsorbent polymer particles 53 will not move outside the most enlarged area 55G, which can effectively prevent the shape of the cell absorbent sheet 50 from collapsing during absorption. In addition, the portion of the strong joint 54a that is continuous in the front-rear direction LD, that is, the longitudinal strong joint line 58, improves the longitudinal liquid diffusibility, and the portion that is continuous in the width direction WD or diagonally upward by the strong joint 54a is The horizontal strong bonding wire 59 improves the liquid diffusivity in the horizontal direction. 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 will diffuse to the surrounding as shown in FIG. The particles 53 will gradually absorb the urine. At this time, as shown in FIGS. 9 and 10, for the cell 55 in which the expansion pressure of the second superabsorbent polymer particle 53 inside becomes high, the weak junction 54b around it cannot resist the expansion pressure and will peel off and be separated from each other. The adjoining cell compartment 55 merges. This combination will continue as long as the second superabsorbent polymer particles 53 absorb and expand to cause the weak junction 54b to peel off, and proceed to the cell 55 having the strong junction 54a around it.

The size, shape, and arrangement of the most enlarged area 55g (that is, the arrangement of the strong junction 54a) can be appropriately specified. If the largest enlargement 55G is too small, it is meaningless to provide the strong junction 54a. The number is large, and when the cells 55 are combined into a long and slender shape, they become a shape that is not easy to expand.

As shown in Figs. 8 to 10, the longitudinal strong joining line 58 is provided at the center and both sides of the cell absorbent sheet 50 in the width direction WD, and the transverse strong joining line 59 is the longitudinal strong joining line in the center. Between 58 and the longitudinal strong joining lines 58 on both sides, each of them repeatedly zigzags in the left and right directions and extends in a zigzag shape in the front and rear directions. As a result, the most enlarged area 55G having an almost triangular shape with the position of the longitudinal strong joining line 58 in the center as the apex, and the largest enlargement having an approximate triangular shape with the position of the longitudinal strong joining line 58 on both sides as the apex is the largest enlargement The block 55G is repeatedly formed in the front-rear direction. If the lateral strong joining lines 59 are formed in such a zigzag shape, a small number of lateral strong joining lines 59 can be used to efficiently promote lateral liquid diffusion, and the most enlarged area 55G becomes an approximate triangle that is easy to expand. The cell volume increase of the number of cells 55 combined is also excellent, so it is preferable.

It is also possible to form only the longitudinal strong joining line 58 without providing the low-expansion cell 55s. At this time, when the excrement is absorbed, the joint 54 will not loosen, so the strong joint 54a remains as the bottom groove, thereby improving the diffusibility.

On the other hand, as shown in FIG. 8 and the like, a hollow cell 56 can also be provided. Compared with other cells, the second superabsorbent polymer particle 53 of the hollow cell 56 has a larger amount of inclusion per unit area. few. In FIG. 11, the cell 55 containing the second superabsorbent polymer particle 53 (that is, the cell 55 excluding the low-expansion cell 55s and the empty cell 56 described later) is given a diagonal line pattern. Among them, the area given the diagonal line pattern in FIG. 8 is assumed to be the dispersion area 53A of the second superabsorbent polymer particles 53 during manufacture; When the absorbent polymer particles 53 can move in the cell 55, the location of the second superabsorbent polymer particles 53 will not be fixed in the cell 55 in the product, but the second superabsorbent polymer particles 53 can also be set in the same way as in other figures. The two superabsorbent polymer particles 53 are distributed throughout the cell 55. The encapsulation amount of the second superabsorbent polymer particles 53 in the cavity 56 is calculated by weight ratio, and it is preferably 1/2 or less of the other cells, and it is particularly preferred that it is not encapsulated at all. For example, the front and rear ends of the cell absorbent sheet 50 are formed by cutting each cell absorbent sheet 50 during manufacture. Therefore, if the second superabsorbent polymer particles 53 are contained in this position, it may cause cutting. The life of the cutting edge of the breaking device becomes shorter. Therefore, it is desirable that at least the cells 55 passing through the front and rear ends of the cell absorbent sheet 50 are empty cell cells 56. In addition, if the cells 55 on both sides in the middle in the front-rear direction LD of the cell absorbent sheet 50 are made into empty cells 56, this part will become a part with little swelling after absorption, so it can be absorbed even after absorption. It becomes a shape that fits the cell absorbent sheet 50 to the leg circumference.

In the above example, only the second superabsorbent polymer particles 53 are enclosed in the cell 55, but it is also possible to polymerize powders and granules other than superabsorbent polymer particles such as deodorant particles with the second superabsorbent polymer particles. The particles 53 are enclosed together.

(Super absorbent polymer particles) As the first superabsorbent polymer particles 43 and the second superabsorbent polymer particles 53, the particles used in such absorbent articles can be used as they are. The particle diameters of the first superabsorbent polymer particles 43 and the second superabsorbent polymer particles 53 are not particularly limited. For example, the proportion of particles exceeding 500 μm is 30% by weight or less, and the proportion of particles smaller than 500 μm and exceeding 180 μm is 60. The ratio of particles exceeding 106 μm and 180 μm or less is 10% by weight or less, and the ratio of particles having 106 μm or less is 10% by weight or less. In addition, the measurement of these particle diameters is performed as follows. That is, 500μm, 180μm, 106μm standard sieves (JISZ8801-1: 2006) and a saucer (saucer) are arranged in this order from above, and a sample of 10g of superabsorbent polymer particles is fed to After sieving (vibrating for 5 minutes) on the 500 μm standard sieve at the top stage, the weight of the remaining particles on each sieve is measured. As a result of this screening, the weight ratio of the sample remaining on each sieve of 500 μm, 180 μm, and 106 μm and the sample remaining on the receiving dish with respect to the input amount of the sample was set as the ratio of particles exceeding 500 μm, The ratio of particles of 500 μm or less and more than 180 μm, the ratio of particles of more than 106 μm and 180 μm or less, and the ratio of particles of 106 μm or less.

The first superabsorbent polymer particles 43 and the second superabsorbent polymer particles 53 can be used without particular limitation, and particles having a water absorption capacity of 40 g/g or more are suitable. In addition, if the first superabsorbent polymer particles 43 and the second superabsorbent polymer particles 53 are manufactured by the crushing method, gel clogging is not likely to occur, so it is preferable. The first superabsorbent polymer particles 43 and the second superabsorbent polymer particles 53 include starch-based, cellulose-based, and synthetic polymer-based particles, and starch-acrylic acid (salt) graft polymers can be used. Particles such as saponified starch-acrylonitrile copolymer, cross-linked sodium carboxymethyl cellulose, and acrylic acid (salt) polymer. As the shape of the first superabsorbent polymer particles 43 and the second superabsorbent polymer particles 53, it is suitable to be generally used in the form of powder or granules, but other shapes may also be used.

As the first superabsorbent polymer particles 43 and the second superabsorbent polymer particles 53, it is suitable to use particles having a water absorption speed of 70 seconds or less, particularly preferably 40 seconds or less. If the water absorption speed is too slow, so-called back seepage in which the liquid supplied into the absorber 70 returns to the outside of the absorber 70 is likely to occur.

In addition, as the first superabsorbent polymer particles 43 and the second superabsorbent polymer particles 53, particles having a gel strength of 1000 Pa or more are suitably used. Thereby, the sticky feeling after liquid absorption can be effectively suppressed.

(Packaging sheet) As shown in FIG. 3 and FIG. 16(a), the absorber 70 can be packaged by the packaging sheet 45. As shown in FIG. At this time, in addition to wrapping one packaging sheet 45 in a cylindrical shape so as to surround the surface, back and both sides of the absorber 70, it is also possible to use two packaging sheets 45 to sandwich between the front and back sides. The way to absorb the body 70 to pack. As the packaging sheet 45, tissue paper, particularly crepe paper, non-woven fabric, composite laminated non-woven fabric, sheet with small holes, etc. can be used. Among them, it is desirable that the superabsorbent polymer particles 53 do not leak out of the sheet. When a non-woven fabric is used as the packaging sheet 45, it is particularly suitable to use a hydrophilic SMS non-woven fabric (SMS, SSMMS, etc.), and the material can be polypropylene, polyethylene/polypropylene composite material, etc. The mass per unit area of the nonwoven fabric used for the packaging sheet 45 is desirably 5 to 40 g/m ² , and particularly desirably 10 to 30 g/m ² .

As shown in Figure 16(b), the packaging sheet 45 is wound from the back of the absorbent body 70 through both sides in the width direction WD of the absorbent body 70 to both sides of the top surface of the absorbent body 70. An area 45S not covered by the packaging sheet 45 is provided in the middle part of the width direction WD of the surface, and it is preferable to provide the upper auxiliary layer 71 in such a way as to encompass the entire area 45S. The absorbent body 70 is generally covered with a packaging sheet 45 in order to prevent the leakage of superabsorbent polymer particles during manufacture, before use or after absorption. In the case of the absorbent body 70 having the upper auxiliary layer 71, it is desirable The upper auxiliary layer 71 can quickly contact the viscous liquid N. Therefore, as shown in FIG. 16( b ), it is desirable to limit the covering range of the packaging sheet 45 and expose the upper auxiliary layer 71 on the top surface of the absorber 70. As this structure, the part of the absorbent body 70 that is not covered by the packaging sheet 45 is also covered by the super absorbent non-woven fabric 42 of the upper auxiliary layer 71. The upper auxiliary layer 71 is basically KLEMM high in water absorption (that is, compact The super absorbent nonwoven fabric 42 of) has the effect of preventing the leakage of superabsorbent polymer particles in the same way as covering the entire absorbent body 70 with the packaging sheet 45.

<Explanation of terms in the manual> When the following terms are used in the specification, as long as they are not specifically described in the specification, they have the following meanings.

・"MD direction (Machine Direction)" and "CD direction" refer to the flow direction (MD direction) and the transverse direction (CD direction) orthogonal to the flow direction in the manufacturing equipment. The front and back direction of the non-woven fabric is the width direction of the product. The MD direction of the non-woven fabric is the direction in which the fibers of the non-woven fabric are oriented. The fiber orientation refers to the direction in which the fibers of the non-woven fabric extend. For example, according to TAPPI (American Pulp and Paper Industrial Technology Association, Technical Association of the Pulp and Paper Industry) standard method T481 zero distance tensile strength measurement method of fiber orientation test method, and determine the fiber orientation based on the ratio of the tensile strength in the front and rear direction and the width direction A simple method of measuring the direction of the fiber to determine the fiber orientation.

・"Front and rear direction" refers to the direction indicated by the symbol LD in the figure (longitudinal direction), and "width direction" refers to the direction indicated by the symbol WD in the figure (left and right direction), and the front and rear direction is orthogonal to the width direction .

・"Front side" refers to the side close to the wearer's skin when worn; "back side" refers to the side away from the wearer's skin when worn.

・"Surface" refers to the side of the component that is close to the skin of the wearer when worn; "back" refers to the side of the component that is away from the skin of the wearer when worn.

・"Expanded state" refers to a state in which it is unfolded flat without shrinking or slack.

・"Elongation" refers to the value when the natural length is set to 100%. For example, the elongation of 200% means the same meaning that the elongation ratio is 2 times.

・"Artificial urine" refers to a mixture of 2wt% urea, 0.8wt% sodium chloride, 0.03wt% calcium chloride dihydrate, 0.08wt% magnesium sulfate heptahydrate, and 97.09wt% ion exchange water If there is no special description, the mixture is used at a temperature of 37°C.

・"Gel strength" is measured as follows. 1.0 g of super absorbent polymer was added to 49.0 g of artificial urine and stirred with a mixer. The resulting gel was placed in a constant temperature and humidity tank of 40℃×60%RH for 3 hours and then returned to normal temperature. The gel was measured with a curdmeter (Curdmeter-MAX ME-500 manufactured by I.techno Engineering) strength.

・"Mass per unit area" is measured as follows. After pre-drying the sample or test piece, place it in a test room or device in a standard state (the temperature of the test site is 23±1°C, and the relative humidity is 50±2%) to make it into a constant state. Preliminary drying refers to making the sample or test piece constant in an environment with a temperature of 100°C. In addition, it is not necessary to perform preliminary drying for fibers with a predetermined moisture regain of 0.0%. Using a template (100 mm×100 mm) for sample selection, a sample with a size of 100 mm×100 mm was cut out from the test piece in a constant state. Measure the weight of the sample and multiply it by 100 to calculate the weight per square meter as the mass per unit area.

・The "thickness" adopts an automatic thickness measuring device (KES-G5 portable compression tester), which is automatically measured under the conditions of a ^{load of 0.098N/cm 2} and a pressurized area of 2 cm ^2.

・"Porosity" is measured by the following method. That is, the part other than the junction part in the middle piece was cut out in a rectangular shape and used as a sample. Determine the length, width, thickness, and weight of the sample. Using the raw material density of the non-woven fabric, calculate the assumed weight when the porosity is 0% in the same volume as the sample. Put the sample weight and the assumed weight into the following formula to find the void ratio. Porosity=[(assumed weight-sample weight)/assumed weight]×100

・"Water Absorption" is measured in accordance with JIS K7223-1996 "Test Method for Water Absorption of Super Absorbent Resin".

・The water absorption speed is the "time to the end point" when using 2 g of super absorbent polymer and 50 g of physiological saline and implementing JIS K 7224-1996 "Test method for water absorption speed of super absorbent resin".

・"KLEMM Water Absorption" is the KLEMM water absorption measured in accordance with "Paper and Paperboard-Water Absorption Test Method-KLEMM Method" stipulated in JIS P 8141:2004.

・"Water retention capacity" is measured according to the following method. A test piece of 10 cm in the MD direction×10 cm in the CD direction (area 100 cm ² ) was prepared, and the weight before absorption was measured. Next, after immersing the test piece in artificial urine for 5 seconds, gently pinch any corner with your thumb and index finger (gently pinch it so as not to squeeze out water as much as possible), and hold it in opposite directions. Hang it with the corners facing downward and leave it for 30 seconds to allow the liquid to drip. After that, when measuring the "water retention under load", the test piece was placed on 8 sheets of filter paper (length 150 mm × width 150 mm) laid one upon another, and a load was applied to the entire top surface of the test piece, A square column-shaped weight (weight 3 kg) with a bottom surface of 100 mm in length x 100 mm in width was placed, the weight (heavy) was removed at 5 minutes, and the absorbed weight of the test piece was measured. When measuring the "water retention capacity under no load", the test piece was placed on 8 sheets of filter paper laid in an overlapping manner, and nothing was placed on the test piece, and the absorbed weight of the test piece was measured after 5 minutes. Based on these measurement results, the difference between the weight after absorption and the weight before absorption is converted into a ^{value per 10 cm 2} of area and used as the "water retention under load" and "water retention under no load".

・As long as there is no special description, the size of each part refers to the size in the unfolded state and not in the natural length state.

・If there is no record about the environmental conditions in the test or measurement, the test or measurement is in a test room or device in a standard state (the test site is at a temperature of 23±1°C and a relative humidity of 50±2%) conduct.

[Industrial availability] The present invention can be used in all absorbent articles such as pants-type disposable diapers and sanitary napkins in addition to the adhesive disposable diapers of the above-mentioned examples.

10: Absorbent body part 11: Liquid-impermeable tablets 12: Exterior non-woven fabric 12T: Target 13: Fastening strap 13A: Locking part 13B: With body part 13C: With mounting part 30: Top piece 40: Intermediate film 42: High-absorbent non-woven fabric 42a: Pulp layer 42b: Support layer 42h: Adhesive 43: The first super absorbent polymer particles 43h: Adhesive 45: packaging film 45S: Area not covered by packaging sheet 50: Cell absorption sheet 50c: recess 50p: convex 50d: The depth of the valley part of the top sheet (the height of the convex part) 50h: Adhesive 51: top film 52: Next film 53: The second super absorbent polymer particles 53A: Scattered area 54: Joint 54a: Strong joint 54b: Weak joint 54c: Edge junction 54D: dot interval 54L: The size of the junction in the direction surrounding the cell 54W: The width of the joint 55: cell compartment 55L: The size in the front and back direction of the cell (the size in the front and back direction of the convex part) 55W: The size in the width direction of the cell (the size in the width direction of the convex portion) 55G: The most expanded block 55s: low swelling cell 56: Empty Cell Room 57: Diffusion Promotion Department 58: Longitudinal strong joint line 59: Horizontal strong joint line 60: Stand up wrinkles 62: Folded sheet 63: pleated elastic member (elastic member) 64: leg circumference elastic member 70: Absorber 71: Upper auxiliary layer 72: main absorption layer 80: Medium film 80s: separation distance 80h: Adhesive B: dorsal part F: Ventral part L: The full length of the diaper X: The full width of the diaper without the fastening tape SF: Flank EF: end wing LD: front and rear direction WD: width direction N: viscous liquid U: non-viscous liquid Z: hypothetical location of urine excretion 1-1,2-2,6-6,7-7,8-8,9-9: section line

Fig. 1 is a plan view showing the unfolded state of the diaper on the inner surface of the adhesive-type disposable diaper. Fig. 2 is a plan view showing the unfolded state of the diaper on the outer surface of the adhesive-type disposable diaper. Fig. 3 is a cross-sectional view taken along line 6-6 in Fig. 1. Fig. 4 is a cross-sectional view taken along line 7-7 in Fig. 1. Fig. 5(a) is a cross-sectional view taken along line 8-8 in Fig. 1; Fig. 5(b) is a cross-sectional view taken along line 9-9 in Fig. 1. Fig. 6 is a cross-sectional view taken along line 5-5 in Fig. 1. Fig. 7(a) is a bottom view of the important part of the absorbent body cut away; Fig. 7(b) is a cross-sectional view taken along line 1-1 in Fig. 7(a). Fig. 8 is a plan view of the absorber. Fig. 9 is a plan view of the absorber. Fig. 10 is a cross-sectional view taken along line 2-2 in Figs. 8 and 9. Fig. 11 is a plan view schematically showing the absorbent body of the joint portion. Fig. 12 is a schematic plan view showing various layout examples of cell compartments. Figure 13 is a cross-sectional view of various cell absorbent sheets. Fig. 14 is a cross-sectional view of various cell absorbent sheets. Fig. 15 is a cross-sectional view showing an important part of the absorbent body. Fig. 16 is a cross-sectional view showing the layer structure of the absorbent body and the packaging sheet. Fig. 17 is a cross-sectional view showing a change during absorption. Fig. 18 is a cross-sectional view schematically showing the layer structure of the super absorbent nonwoven fabric.

Domestic hosting information (please note in the order of hosting organization, date and number) without

Foreign hosting information (please note in the order of hosting country, institution, date, and number) without

42: High-absorbent non-woven fabric

42h: Adhesive

43: The first super absorbent polymer particles

43h: Adhesive

45: packaging film

50: Cell absorption sheet

50h: Adhesive

53: The second super absorbent polymer particles

70: Absorber

71: Upper auxiliary layer

72: main absorption layer

N: viscous liquid

U: non-viscous liquid

WD: width direction

Claims (6)

An absorbent article characterized by comprising an absorbent body, a liquid-permeable top sheet, and a liquid-impermeable sheet, the top sheet is arranged on the surface side of the absorbent body, and the liquid-impermeable sheet is arranged on the absorbent body The dorsal side of the body; Wherein, the aforementioned absorber includes a cell absorption sheet, the cell absorption sheet has cells and powder particles, and the cell is surrounded by liquid-permeable upper and lower sheets, and the upper and lower sheets. The joint part of the sheet surrounds the non-joining part of the upper sheet and the lower sheet, and the powder and granule include superabsorbent polymer particles contained in the cell; The aforementioned bottom sheet is a super absorbent nonwoven fabric, and the super absorbent nonwoven fabric has a KLEMM water absorption of 50 mm or more, a water retention capacity of 0.1 g or more under load, and a water retention capacity of 0.5 g or more under no load. The absorbent article according to claim 1, wherein the super absorbent nonwoven fabric constituting the lower sheet is a wet nonwoven fabric, the wet nonwoven fabric contains 50% or more pulp fibers or rayon fibers and has a mass per unit area of 25 to 50g/m ² . The absorbent article according to claim 2, wherein the wet non-woven fabric has a support layer and a pulp layer, the support layer contains long fibers of synthetic resin, and the pulp layer is located on the outermost surface side and is composed of only pulp fibers. The absorbent article according to any one of claims 1 to 3, wherein the absorbent body has an upper auxiliary layer on the cell absorbent sheet; The upper auxiliary layer has a super absorbent nonwoven fabric and super absorbent polymer particles, the surface of the super absorbent nonwoven fabric is exposed on the top surface of the absorbent body and the KLEMM water absorption is 100mm or more, and the super absorbent polymer particles are adjacent to this The back of the super absorbent non-woven fabric. The absorbent article according to any one of claims 1 to 4, wherein a portion of the top sheet located in each cell is pushed upward, and a pair of recesses are formed on the top and bottom surfaces of the top sheet And convex. The absorbent article according to any one of claims 1 to 5, wherein the portion of the lower sheet located in each cell is pushed out to the lower side, and the top and bottom surfaces of the lower sheet form a pair of Concave and convex.

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