JP4850272B2 - Absorbent articles - Google Patents

Description

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

Absorbent articles such as general disposable diapers and sanitary napkins, as a basic configuration, an absorbent body, an impermeable backsheet disposed on the back side of the absorbent body, and a surface side of the absorbent body, A liquid-permeable top sheet that contacts the wearer's body.
Absorbents are widely used in which high-absorbent polymer particles (SAP) are mixed with hydrophilic short fibers such as pulverized pulp, and are spread in a cotton-like form. A mixture of continuous fibers such as acetate mixed with superabsorbent polymer particles is also used. In particular, in order to further reduce the thickness and weight without reducing the absorption performance, increasing the amount of superabsorbent polymer and decreasing the amount of fiber material is a simple and effective solution.

However, in a general structure in which superabsorbent polymer particles are dispersed and mixed in an aggregate of cotton-like pulp or continuous fibers, the number of superabsorbent polymer particles that do not settle in the fiber aggregate increases, resulting in uneven distribution of the superabsorbent polymer particles. There are many problems that are difficult to solve, such as a decrease in absorption performance and a deterioration in touch (when the superabsorbent polymer particles not held by the absorbent body are touched from the outer surface of the product, it feels awkward).
In order to solve the problems in the absorber having such a general structure, two liquid-permeable sheets are intermittently joined to form cells between the joints, and the superabsorbent polymer particles in the cells Various absorbers have been proposed in which an absorbent material mainly composed of is encapsulated (see, for example, the following patent document). These conventional ones are difficult to thin in order to firmly secure a holding space for the superabsorbent polymer particles, and there is almost no space for absorption expansion of the superabsorbent polymer particles, but it is easy to thin the superabsorbent polymer particles. It can be broadly classified into those which are intended to realize a reduction in thickness while ensuring a sufficient space for absorption and expansion of the superabsorbent polymer particles.

However, in these conventional products, the cell is deformed and moved freely due to external force applied at the time of product packaging and use, etc., and it becomes unnecessarily thick or thin evenly. There was a risk of becoming. As a result, not only the feeling of wearing and the feeling of touch is deteriorated, but also the absorption performance may be lowered, for example, the volume of the cell cannot be expanded smoothly at the time of absorption.
In order to solve this problem, the present inventor has a first sheet and a second sheet in which a large number of ridges extending in a predetermined direction are arranged side by side, and the first sheet and the second sheet in each fold. 1 sheet side bottom part is joined to form a joined part. Between these joined parts, the first sheet and the second sheet are not joined to form a tunnel-like cell, and an absorbent material is enclosed in each cell. In the absorbent body made, it was invented to put each ridge of the second sheet in a lying state. According to this plan, the absorbent body before absorption becomes very thin, and it becomes excellent in the feeling of wearing and touch, and the powdered absorbent material is distributed and enclosed in many cells as in the past, Even if the absorption amount is increased by using a large amount of the absorbent material, uneven absorption amount and absorption inhibition due to the uneven distribution of the absorbent material are prevented.

Japanese Patent Laid-Open No. 10-014978 JP-A-63-059464 JP-A-6-269475 JP 2006-247398 A JP 2008-532648 A JP 7-504206 A

However, in the above prior art and the proposal by the present inventor, if the absorbent material is sealed in a non-fixed manner so as to be movable with a sufficient gap in the cell in order to suppress the swelling inhibition of the absorbent material, it is absorbed in the cell. There was a possibility that the material was unevenly distributed. If the absorbent material is unevenly distributed in the cell, leakage may occur due to a local decrease in absorption performance in a portion with a small amount of absorbent material or a local increase in the thickness of the absorber in a portion with a large amount of absorbent material. It is not preferable because the wearing feeling may be deteriorated.
Then, the main subject of this invention is suppressing the uneven distribution of the absorber in a cell, maintaining the advantage of the absorber with which the absorber was enclosed with many cells so that a movement was possible.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
In an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body interposed therebetween,
The absorbent body includes a first sheet disposed on the back sheet side, a second sheet disposed on the top sheet side and provided with a large number of ridges extending in the front-rear direction or the width direction, and the first sheet. An absorbent material disposed between the sheet and the second sheet, and at least the top sheet side of the first sheet and the second sheet has liquid permeability,
The first sheet and the first sheet side bottom of each ridge of the second sheet are joined to form a joined part, and the first sheet and the second sheet are not joined between these joined parts. Tunnel-shaped cells are formed, and the absorbent material is enclosed in each cell,
The adjacent joints are separated by a predetermined interval,
Wherein all folds of the second sheet, the entire respective folds either in one direction arrangement direction is set to the laid-down by one-way inclined state to fall, and the extending direction of the both end portions of each fold of the second sheet Is fixed in the one-way lying state, and the middle part between these fixed parts is configured to be able to stand up from the one-way lying state,
The absorbent material is a granular material containing at least superabsorbent polymer particles,
The apparent volume at the time of non-absorption of the absorbent material enclosed in the cell is small with respect to the maximum volume in each cell, and at least a part of the absorbent material in each cell is movable in the cell,
An adhesive layer is provided on the portion of the first sheet exposed to the cell inner surface,
An absorbent article characterized by the above.

(Function and effect)
By providing such an adhesive layer, it becomes difficult for the absorbent material to move due to the adhesive force of the adhesive layer, and the movement of the other absorbent material is blocked by the absorbent material that has become difficult to move. Therefore, uneven distribution of the absorbent in the cell is effectively suppressed. If the absorbent material is unevenly distributed in the cell, the absorption performance may be locally reduced in a portion where the absorbent material is small, or the absorber thickness may be locally increased in a portion where the absorbent material is large. May occur or the wearing feeling may deteriorate.

In particular, when each ridge of the second sheet in the absorbent body is provided in a lying state and both ends of each ridge are fixed, the cell cannot expand at both ends in the longitudinal direction of the ridge, but the center side from both edges It has an expanded shape such that the expandable amount in the thickness direction increases as it goes to. Therefore, even if the absorbent material is unevenly distributed at the end portion of the cell, the absorbent material expands gradually while moving toward the center side of the cell, which has a larger expandable amount in the thickness direction and more easily expands during absorption expansion. Will do. As a result, it is difficult for a portion having a small amount or a large amount of absorbent material to be locally generated in the cell, and it is difficult for leakage or deterioration of wearing feeling to occur.
In addition, when each wrinkle of the second sheet in the absorbent body is provided in a state where it is lying down in one direction, the absorbent body before absorption becomes very uniform and thin, and becomes even more excellent in the feeling of wearing and touching, Absorption inhibition is unlikely to occur because the volume of the cell smoothly expands during absorption. Moreover, since the both ends of each saddle are fixed, the intended lodging state can be reliably maintained. In addition, since the powdered absorbent is distributed and enclosed in a large number of cells, even if a large amount of absorbent is used and the amount of absorption is increased, uneven absorption and absorption inhibition due to the uneven distribution of the absorbent. Is prevented.

In addition, since the absorbent material is sealed in the cell with a sufficient gap, the swelling of the absorbent material is hardly inhibited.
Furthermore, since the adjacent joints are separated in the direction perpendicular to the ridges, the cell inlet is opened during manufacture, and there is an advantage that the absorbent can be easily put into the cells.
The “maximum volume in the cell” means the volume when the cell is in a cylindrical shape with a perfect circular cross section (the same applies hereinafter).

<Invention of Claim 2>
The absorbent article according to claim 1, wherein the adhesive layer of the first sheet has a loop tack adhesive strength of 5 to 40 N / 25 mm.

(Function and effect)
If the adhesion (tackiness) of the pressure-sensitive adhesive layer is more than a certain level, the absorbent material is firmly adhered and held to inhibit swelling, or the wrinkles of the second sheet are adhered to the pressure-sensitive adhesive layer of the first sheet, There is a risk that expansion may be inhibited. Moreover, when the adhesiveness of the adhesive layer is too weak, the effect of preventing the movement of the absorbent material becomes poor. Therefore, the adhesiveness of the adhesive layer is preferably within the above range. The loop tack adhesive strength is measured as follows. Cut the sample into a tape shape with a width of 25 mm, a length of 250 mm, and a play portion of 25 mm at both ends, with the adhesive surface on the outside, align both ends into a loop, and attach the play portions at both ends to the upper chuck of the tensile tester. A polyethylene plate (Japanese test panel standard test plate) is mounted horizontally on the lower chuck of the tensile tester, the distance to the upper chuck is 210 mm, the upper grip is lowered by 150 mm at a speed of 300 mm / min, and 15 at that position. After holding for 2 seconds, it is peeled off at a speed of 300 mm / min, and the tensile load value obtained under environmental conditions of 25 ° C. is defined as the loop tack adhesion (N / 25 mm).

<Invention of Claim 3>
The pressure-sensitive adhesive layer is provided over the entire portion of the first sheet exposed on the inner surface of the cell , and the joint portion and the pressure-sensitive adhesive layer are integrally formed of the same adhesive. The absorbent article as described.

(Function and effect)
The adhesive layer may be provided partially, or may be provided in a pattern such as a dotted pattern, a staggered pattern, etc., but from the viewpoint of preventing the movement of the absorbent and manufacturing ease, as described above. It is preferable to provide over the whole part exposed to the cell inner surface in a 1st sheet | seat.

Further, by adopting such a structure, the joint portion and the adhesive layer of the first sheet can be formed at a time, and the manufacture becomes easy.

<Invention of Claim 4 >
The portion of the second sheet exposed to the inner surface of the cell has an average surface friction coefficient MIU of 0.2 or less, a variation coefficient MMD of the surface friction coefficient of 0.01 or less, and a surface roughness SMD of 10 micrometers or less. The absorbent article according to claim 3 .

(Function and effect)
Thus, if the friction between the part exposed to the cell inner surface of the second sheet and the absorbent material is weak to some extent, even if the absorbent material is unevenly distributed in the cell before absorption, After the contact, it moves along the inner surface of the second sheet, so that the absorbent material further spreads easily and uneven distribution is reduced. Each numerical value of MIU, MMD, and SMD was measured using a KES-SE friction tester (manufactured by Kato Tech).

<Invention of Claim 5 >
The superabsorbent polymer particles are particles having a particle size of 1000 μm or less,
The second sheet is a nonwoven fabric having a meltblown nonwoven fabric layer between the spunbond nonwoven fabric layer and the spunbond nonwoven fabric layer, having a fiber basis weight of 5 to 20 g / m ² and a thickness of 0.05 to 0.25 mm. The absorbent article according to claim 4 .

(Function and effect)
By using such a nonwoven fabric, it becomes difficult for the superabsorbent polymer particles enclosed inside to escape from the second sheet side. Although the same nonwoven fabric is preferably used for the first sheet, other materials may be used on the first sheet side because the superabsorbent polymer particles are difficult to escape due to the adhesive layer. The thickness is a numerical value at a load of 0.5 g / cm ² measured using a KES-G5 handy compression tester (pressure plate is 2 cm ² circular, compression deformation rate is 0.1 mm / sec).

<Invention of Claim 6 >
2. The absorbent article according to claim 1, wherein the absorbent body is provided such that wrinkles of the second sheet extend along a width direction.

(Function and effect)
When the wrinkles of the second sheet extend along the width direction, the size of each cell is smaller than when extending in the front-rear direction. There is an advantage that the degree of uneven distribution may be relatively small. Furthermore, since each of the ridges serves as a weir that blocks the excrement from moving back and forth, leaking back and forth is less likely to occur.

<Invention of Claim 7 >
The separation distance between the adjacent joints in the juxtaposed direction of the ridges is configured to be larger than the width of the joints in the juxtaposed direction of the heels,
Two of the double portion of the second sheet and the single portion of the second sheet that are formed in at least some of the cells in the lying state and at least some of the cells partially overlap with adjacent cells. The overlapping portion is formed so as not to overlap the double portion of the second sheet formed in an adjacent cell,
The absorbent article of Claim 6 whose apparent volume at the time of absorption saturation of the absorber enclosed inside with respect to the maximum volume in each said cell is 70 to 120%.

(Function and effect)
When formed in such a dimensional ratio, the cells can be formed relatively shallow even if cells having the same maximum volume are formed, so that wrinkles on the absorber surface do not become too large, and the cells at the time of absorption Since the expansion of the volume becomes smoother, it is preferable. Of course, thinness, wearing feeling, and touch feeling can be improved.
In addition, if the interval between adjacent joints is large, the area of the cell inlet is increased, so that there is also an advantage that it is easy to put the absorbent material into the cell during production.

  Furthermore, if the cells are too far apart, because there is a portion that does not have an absorbent material between adjacent cells, it is difficult to ensure the amount of absorption, there is a risk that a decrease in absorption performance, such as slow absorption speed may occur, If the cells partially overlap, such a decrease in absorption performance can be prevented. In addition, if the cells are too far apart, a relatively large step is formed between the portion between the adjacent cells and the cell portion, which may adversely affect the wearing feeling and the touch feeling.

  However, in the case where the cells adjacent to each other in a lying state overlap in this way, when the double portions of the second sheet of each cell overlap, not only the portion becomes excessively thick, but also the second sheet and the first This is not preferable because the gap with the sheet becomes wide and the absorbent material easily moves. In addition, since cells are densely packed, there is a possibility that smooth expansion of the cells may be hindered due to interference with adjacent cells, and expansion in the thickness direction is biased, and the thickness after absorption increases unnecessarily. Therefore, it is not preferable. Therefore, from this viewpoint, as described above, it is preferable that the double portions of the second sheets of the cells do not overlap each other.

  Further, when the apparent volume at the time of absorption saturation of the absorbent material enclosed in the cell is 70 to 120% with respect to the maximum volume in each cell, the absorption amount is conventionally reduced while suppressing the swelling inhibition of the absorbent material. It is preferable because it can be remarkably improved as compared with the general absorber.

  As described above, according to the present invention, it is possible to suppress the uneven distribution of the absorbent material in the cell while maintaining the advantage of the absorbent body in which the absorbent material is movably enclosed in a large number of cells. Brought about.

It is a top view in the state where the diaper was developed showing the inside of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. It is a top view in the state where the diaper was developed showing only the principal part of a pants type disposable diaper. It is sectional drawing which shows only the principal part of a pants type disposable diaper. It is a front view of a product state. It is a rear view of a product state. It is a top view in the state where the diaper was developed showing the inner surface of a tape type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a tape type disposable diaper. FIG. 6 is a sectional view taken along line 6-6 of FIG. It is the 7-7 sectional view taken on the line of FIG. It is the 8-8 sectional view taken on the line of FIG. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 10. It is various sectional drawing of an absorber. It is a top view of an absorber which has the section structure of Drawing 16 (c), and an important section section. It is a top view of the absorber which has the cross-sectional structure of Fig.16 (a). It is a top view of the absorber which a cell follows a front-back direction. It is the schematic sectional drawing of the absorber which showed typically the difference in the change at the time of absorption by the difference in a cell interval and an absorber / cell maximum volume ratio. It is the principal part schematic sectional drawing of the absorber which showed typically the difference in the change at the time of absorption by the difference in a cell space | interval and an absorber / cell maximum volume ratio. It is the principal part schematic sectional drawing of the absorber which showed typically the difference in the change at the time of absorption by the difference in a cell space | interval and an absorber / cell maximum volume ratio. It is the principal part schematic sectional drawing of the absorber which showed typically the difference in the change at the time of absorption by the difference in a cell space | interval and an absorber / cell maximum volume ratio. It is the principal part schematic sectional drawing of the absorber which showed typically the difference in the change at the time of absorption by the difference in a cell space | interval and an absorber / cell maximum volume ratio. It is the principal part schematic sectional drawing of the absorber which showed typically the difference in the change at the time of absorption by the difference in a cell space | interval and an absorber / cell maximum volume ratio. It is a principal part schematic sectional drawing which shows another form. It is a partially broken perspective view which shows roughly the principal part of another absorber. It is a partially broken perspective view which shows roughly the principal part of another absorber.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, “front-rear direction” means a direction (vertical direction) connecting the ventral side (front side) and back side (rear side), and “width direction” means a direction (left-right direction) perpendicular to the front-rear direction. "Up and down direction" means the wearing state of the diaper, that is, the waistline direction when the diaper is folded in two at the crotch so that both the front body side and the back body side of the diaper overlap each other It means a direction orthogonal to each other, that is, a direction connecting the waist side and the crotch side.

<Structure example of pants-type disposable diaper>
1 to 9 show an example of a pants-type disposable diaper. This pants-type disposable diaper is composed of an exterior sheet 12 forming the outer surface (back surface) of the product and an interior body 200 attached to the inner surface of the exterior sheet. The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior sheet 12 is a part that is worn by the wearer. In addition, the dot pattern part in sectional drawing has shown the junction part which joins each structural member, and is formed by solid, beads, curtains, summits, spiral application, etc., such as a hot-melt-adhesive.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a top sheet 30 on the body side, a liquid-impermeable back sheet 11, and an absorbent body 56 interposed therebetween. It is. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent body 56 in order to quickly move the liquid that has passed through the top sheet 30 to the absorbent body 56. Shows a three-dimensional gather 60 that stands on the body side and is provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

Hereinafter, the material of each part will be described in order.
(Top sheet)
The top sheet 30 has a property of allowing liquid to pass through, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .

  The top sheet 30 may be composed of a single sheet or a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

When providing the three-dimensional gather 60, both sides of the top sheet 30 pass between the liquid-impervious backsheet 11 and the three-dimensional gather 60 to the back side of the absorbent body 56 to prevent the penetration of the liquid. It is preferable to adhere to the liquid-impermeable back sheet 11 and the three-dimensional gather 60 with a hot melt adhesive or the like.
The top sheet 30 can be omitted.

(Intermediate sheet)
In order to move excrement that has permeated through the top sheet 30 to the absorber and prevent reversal, an intermediate sheet (second sheet is also called) 40 having a higher liquid permeation speed than the top sheet 30 between the top sheet 30 and the absorber 56. Can be provided. This intermediate sheet 40 not only quickly transfers the excrement to the absorber to enhance the absorption performance by the absorber, but also prevents the excretion of the absorbed excrement from returning from the absorber and improves the feel of the top sheet 30 surface. To do. The intermediate sheet 40 can be omitted.

As the intermediate sheet 40, the same material as the top sheet 30, spunlace, spunbond, laminated nonwoven fabric having a meltblown nonwoven fabric layer between the spunbond nonwoven fabric layers (for example, SMS nonwoven fabric, SMMS nonwoven fabric, etc.), pulp nonwoven fabric, pulp and rayon Examples of the mixed sheet, point bond or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

  The intermediate sheet 40 is preferably bonded to the top sheet 30. When heat embossing or ultrasonic welding is used for the bonding, the material of the intermediate sheet 40 preferably has the same melting point as the top sheet 30.

  Further, considering the permeation of the solid content in the stool, the fineness of the fiber used for the intermediate sheet 40 is preferably 5.0 to 7.0 dtex, but the liquid residue in the top sheet 30 increases. On the other hand, when the fineness of the fiber used for the intermediate sheet 40 is 1.0 to 2.0 dtex, the liquid residue of the top sheet 30 hardly occurs, but the solid content of the stool is difficult to permeate. Therefore, it is preferable that the fiber of the nonwoven fabric used for the intermediate sheet 40 has a fineness of about 2.0 to 5.0 dtex.

  The intermediate sheet 40 in the illustrated form is disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the entire length of the diaper, may be the same as the length of the absorbent body 56, or may be within a short length range centered on the region that receives the liquid.

(Absorber)
The absorber 56 will be described later. The absorber 56 can be bonded to the inner surface of the liquid-impermeable back sheet 11 via an adhesive such as a hot melt adhesive on the back surface.

(Impermeable liquid back sheet)
The material of the liquid-impermeable back sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a plastic film such as polyethylene, or a waterproof film A non-woven fabric having liquid impermeability substantially secured by interposing (in this case, a liquid-impervious backsheet is composed of a waterproof film and a non-woven fabric) can be used.

  In particular, the liquid-impermeable back sheet 11 is preferably a liquid-impermeable and moisture-permeable material that has recently been favored and used from the viewpoint of preventing stuffiness. As such a plastic film having moisture permeability, an inorganic filler such as calcium carbonate particles is kneaded in an olefin-based resin such as polyethylene or polypropylene, a sheet is formed, and then stretched in a uniaxial or biaxial direction. The resulting microporous plastic film is widely used. Other than this, non-woven fabric using microdenier fiber, leakproof reinforcement by reducing the voids of the fiber by applying heat or pressure, coating of highly water-absorbing resin or hydrophobic resin or water repellent A sheet that is liquid-impermeable without using a plastic film by the method can also be used as the liquid-impermeable back sheet 11.

  The liquid-impermeable back sheet 11 is preferably extended to both sides of the side surface of the top sheet 30 of the absorbent body 56 so as to improve leakage resistance. The width of the extended portion is suitably about 5 to 20 mm on the left and right.

  Further, an excretion indicator 80 whose color is changed by contact with the liquid can be provided inside the liquid-impermeable back sheet 11, particularly between the absorbent body 56.

(Three-dimensional gather)
The three-dimensional gather 60 is a belt-like member that extends over the entire front-rear direction along both side portions of the interior body 200, blocks urine and soft stool that move in the lateral direction along the top sheet 30, and prevents side leakage. It is provided for this purpose. The three-dimensional gather 60 of the present embodiment is provided so as to stand up from the side portion of the interior body 200, the base side portion rises obliquely toward the center in the width direction, and the tip side portion from the intermediate portion has a width. It stands up diagonally outward in the direction.

  More specifically, the three-dimensional gather 60 folds the belt-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction and folds it into two. In addition, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. An end portion of the three-dimensional gather 60 opposite to the folded portion in the width direction is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200, and portions other than the attachment portion 65 protrude from the attachment portion 65. It is set as the protrusion part 66 (part by the side of a folding | turning part). Further, both end portions in the front-rear direction of the protruding portion 66 extend from the mounting portion 65 to the side surface of the top sheet 30 through the side portion of the interior body 200 and are hot-melted with respect to the side surface of the top sheet 30. The base side portion is fixed to the front and rear fixing portion 67 by an adhesive or heat seal, and the tip side portion is folded back outward in the width direction from the tip of the base side portion and fixed to the base side portion. An intermediate part in the front-rear direction of the protruding part is an unfixed free part (inner free part), and an elongated elastic member 63 extending in the front-rear direction is fixed to the free part in an extended state.

As the gather sheet 62, a spunbond nonwoven fabric (SS, SSS, etc.), a laminated nonwoven fabric having a meltblown nonwoven fabric layer between the spunbond nonwoven fabric layers (for example, SMS nonwoven fabric, SMMS nonwoven fabric, etc.), a melt blown nonwoven fabric, etc. An excellent non-woven fabric that has been subjected to water repellency treatment with silicon or the like as required can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. Moreover, as shown in the drawing, a waterproof film can be interposed between the gather sheets folded in two.

  2-6 are preferable and, as for the number of the elongate elastic expansion-contraction members 63 provided in the free part of the three-dimensional gather 60, 3-5 are more preferable. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side.

  The fixing target of the attachment portion 65 of the three-dimensional gather 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable back sheet 11, the absorber 56 in the interior body 200.

  In the three-dimensional gather 60 thus configured, the contraction force of the elongated elastic elastic member 63 acts so that both ends in the front-rear direction are brought close to each other, but the both ends in the front-rear direction of the protruding portion 66 are fixed so as not to stand up. On the other hand, since they are non-fixed free portions, only the free portions stand up against the body side as shown in FIG. In particular, when the attachment portion 65 is positioned on the back surface side of the interior body 200, the three-dimensional gather 60 stands up so as to open outward in the width direction at the crotch portion and in the vicinity thereof. It comes in contact, and the fit is improved.

  The dimensions of the three-dimensional gather 60 can be determined as appropriate. In the case of an infant paper diaper, for example, as shown in FIG. 7, the standing height of the three-dimensional gather 60 (the length in the width direction of the protruding portion 66 in the unfolded state) W6 is It is preferably 15 to 60 mm, particularly 20 to 40 mm. In addition, the distance W3 between the folds located on the innermost side in a state where the three-dimensional gather 60 is folded flat so as to be parallel to the surface of the top sheet 30 is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.

  Note that, unlike the illustrated embodiment, the three-dimensional gathers can be provided in double (two rows) on the left and right sides of the interior body 200.

(Exterior sheet)
The exterior sheet 12 has a ventral part F extending from the crotch part to the ventral side and a dorsal part B extending from the crotch part to the dorsal side. As shown in FIGS. 8 and 9, a pair of left and right leg openings LO for passing the legs and a torso opening WO for passing the wearer's torso are formed. Is. Reference numeral 12A denotes a joining portion (hereinafter, this portion is also referred to as a side seal portion). The crotch portion means the center in the front-rear direction from the waist edge of the ventral part to the waist edge of the dorsal part in the deployed state, and the front part and the rear part are the ventral part F. And the back portion B.

  The exterior sheet 12 includes a trunk periphery T that is defined as a longitudinal range extending from the trunk opening WO to the upper end of the leg opening LO, and an intermediate portion L that is defined as a longitudinal range of a portion that forms the leg opening LO. The waistline portion T can be conceptually divided into a “waist side end” W and a “waistline lower portion” U. These lengths in the front-rear direction vary depending on the size of the product and can be determined as appropriate. For example, the waist side end portion W may be 15 to 40 mm, and the waist lower portion U may be 65 to 120 mm. . On the other hand, both side edges of the intermediate portion L are bundled along the circumference of the wearer's leg, and this is a portion into which the wearer's leg is put. As a result, the exterior sheet 12 has a substantially hourglass shape as a whole. The degree of tightness of the exterior sheet 12 can be determined as appropriate, and as shown in FIGS. 1 to 10, the narrowest part may be narrower than the width of the interior body 200 in order to obtain a clean appearance. However, the narrowest part can be determined so as to be equal to or larger than the width of the interior body 200.

  As shown in FIGS. 3 to 5, the exterior sheet 12 is formed by bonding two sheet base materials 12 </ b> S and 12 </ b> H with an adhesive such as a hot melt adhesive, and is located on the inner side. Although the base material 12H extends only to the edge of the waist opening WO, the outer sheet base material 12S wraps around the waist side edge of the inner sheet base material 12H and is folded back to the inside. 12r is extended so that it may cover to the waist side edge part of the interior body 20. As shown in FIG.

The sheet base materials 12S and 12H can be used without particular limitation as long as they are sheet base materials, but are preferably non-woven fabrics. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. In particular, a long-fiber nonwoven fabric such as a spunbond nonwoven fabric or a laminated nonwoven fabric having a melt-blown nonwoven fabric layer between the spunbond nonwoven fabric layers (for example, an SMS nonwoven fabric, an SMMS nonwoven fabric, etc.) is preferable in that both the touch and strength can be achieved. In addition to using a single nonwoven fabric, a plurality of nonwoven fabrics can be used. In the latter case, the nonwoven fabrics 12 are preferably bonded to each other with a hot melt adhesive or the like. When using a nonwoven fabric, the fabric weight is preferably 10 to 50 g / m ² , particularly 15 to 30 g / m ² .

Moreover, it is preferable that the total basis weight of the exterior sheet 12 is about 20 to 60 g / m ² so that the design of the printing sheet 25 to be described later can be satisfactorily viewed from the outer surface of the product through the exterior sheet 12. The total light transmittance specified in 7105 is preferably 40% or more, particularly 50% or more.

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

More specifically, between the inner surface of the inner sheet base 12H and the outer surface of the folded portion 12r of the outer sheet base 12S at the waist end (upper end) W of the back portion B and the ventral portion F. The plurality of waist elastic elastic members 17 and 18 are fixed in a state where they are stretched along the width direction at a predetermined stretch rate at intervals in the vertical direction so as to be continuous over the entire width direction. In addition, one or more of the waist elastic elastic members 17 and 18 disposed in a region adjacent to the waistline lower portion U may overlap with the interior body 200 or overlap with the interior body 200. You may each provide in the width direction both sides except the width direction center part. As the waist resilient and elastic members 17 and 18, the thickness 155～1880Dtex, particularly about 470～1240Dtex (the case of synthetic rubber. Cross-sectional area in the case of natural rubber 0.05 to 1.5 mm ^2, in particular 0.1 the rubber thread of 1.0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, an extension ratio 150% to 400%, preferably fixed in particular about 220-320%. The waist elastic elastic members 17 and 18 need not all have the same thickness and expansion rate. For example, the elastic elastic members have different thicknesses and expansion rates at the upper and lower portions of the waist end W. Also good.

  In addition, a central portion in the width direction that overlaps the interior body 200 is formed between the outer surface of the inner sheet base 12H and the inner surface of the outer sheet base 12S in the lower waist portion U of the ventral portion F and the back portion B. In addition, a plurality of elongated elastic elastic members 15 and 19 are spaced apart in the vertical direction so as to be continuous over the entire width direction at each of the upper side and both sides in the width direction, and at a predetermined extension rate in the width direction. It is fixed in a stretched state.

The elongated elastic elastic members 15 and 19 of the lower waist part U have a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , the rubber thread 0.1~1.0mm about ^2), 1 to 15 mm, particularly 5 to 30 present approximately at intervals of 3 to 8 mm, to secure in extension ratio 200 to 350%, particularly about 240 to 300% Is preferred.

  Moreover, the width direction center part which overlaps with the interior body 200 is excluded between the outer surface of the inner sheet base 12H and the inner surface of the outer sheet base 12S in the middle part L of the ventral part F and the back part B. A plurality of elongated elastic elastic members 16 are stretched along the width direction at a predetermined stretch rate at intervals in the vertical direction so as to be continuous over the entire width direction at each part on both sides in the width direction. It is fixed in the state.

The elongated elastic elastic members 16 and 18 of the intermediate portion L have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, a cross-sectional area of 0.05 to 1.5 mm ² , The thread rubber of about 0.1 to 1.0 mm ² ) is fixed at 5 to 40 mm, particularly about 2 to 10 at intervals of 5 to 20 mm, respectively, with an elongation of 150 to 300%, particularly 180 to 260%. preferable.

  In addition, as shown in the drawing, the elongated elastic elastic members 15, 19, 16, and 18 of the lower waist portion U and the intermediate portion L are provided on both sides in the width direction except for the central portion in the width direction that overlaps the interior body 200. It is preferable that the interior body 200 does not shrink more than necessary in the width direction, and it does not look bad and does not deteriorate absorbability. In this form, in addition to the form in which the elastic stretchable member exists only on both sides in the width direction, the elastic stretchable member exists from one side of the width direction to the other side across the interior body 200, but overlaps the interior body 200. A configuration is also included in which the elastic stretchable member is cut at the center in the width direction so that the stretchable force does not act (substantially equivalent to not providing the elastic stretchable member). Of course, the arrangement of the elongated elastic members 15, 19, 16, 18 is not limited to the above example, and the elongated elastic expansion / contraction of the lower waistline U so that the elastic force acts on the entire widthwise direction of the lower waistline U. Part or all of the members 15, 19, 16, and 18 can be provided from one side in the width direction to the other side across the interior body 200.

  In addition, when the elongated elastic elastic members 15 to 19 cross a printing sheet 25 described later, when a rubber containing titanium oxide is used as the elongated elastic elastic members 15 to 19, the content of titanium oxide is low ( It is preferable to use those not containing titanium oxide (for example, 2% or less).

(Post-processing tape)
A post-processing tape 70 (fixing means) is provided at the center in the width direction on the outer surface of the back portion B of the exterior sheet 12. The post-processing tape 70 is for fixing the diaper in a state of being rounded or folded so that the top sheet 30 is on the inside and the ventral portion F is on the inside. The general post-processing tape 70 has a narrow strip shape with a width of about 5 to 15 mm and a length of about 100 to 200 mm, and a base end portion is fixed to the outer surface of the exterior sheet 12 with an adhesive or the like. The portion on the tip side is folded into a length of about 40 to 80 mm by tri-folding (Z-shaped cross section) or bi-folding, and the portion between the folded portions is fixed (temporarily fixed) so as to be peelable by an adhesive. At the time of disposal, the diaper is rounded or folded so that the top sheet 30 is on the inside and the ventral part F is on the inside, and then the folded portion of the post-processing tape 70 is peeled off and spread, and the diaper is rounded or folded. The diaper is fixed with an adhesive so as to be wound from the back side portion B of the diaper over the waist opening WO to the opposite outer surface. The post-processing tape 70 is particularly preferably a tri-fold shape that can be folded compactly when not in use and can be expanded into a long shape when in use.

Moreover, it is good also as the post-processing tape 70 which does not have the base end part fixed to the outer surface of the exterior sheet 12, and is attached to the diaper surface removably. In the case of such a form, the post-processing tape 70 is preferably composed of a base sheet and a hook material of a mechanical fastener, and the shape is not limited to a narrow band shape, but a rectangle, a circle, other figures, etc. The shape can be an appropriate shape, and the dimensions can be about 20 to 100 mm in length and width, respectively, and the area can be about 1000 to 5000 mm ² .

  The fixing means such as the post-processing tape 70 may be provided on the ventral portion F, may be provided on both the back portion B and the ventral portion F, or may be provided on both the left and right sides instead of the central portion in the width direction. Good.

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

(Print sheet)
Between the liquid-impermeable back sheet 11 and the exterior sheet 12 (including the interlayer of the exterior sheet 12), a print sheet 25 that is designed by printing is provided. The printing sheet 25 in the illustrated example is individually provided on the abdominal part F and the back part B, but may be provided so as to be continuously integrated from the abdominal part F to the back part B through the crotch part. it can.

As the sheet base material of the printing sheet 25, a plastic film, non-woven fabric, paper, or the like can be used, but a bulky material having high air permeability is preferable. When using a plastic film, it is desirable to have moisture permeability in order to prevent stuffiness. Nonwoven fabrics and paper are preferable because they have moisture permeability. However, when nonwoven fabrics are used, it is preferable to use ones that are smooth and easy to print, and when papers are used, ones that have high strength and are difficult to bleed ink. Particularly preferred are basis weight 15 to 35 g / m ² approximately, crepe paper having a thickness of about 0.1 to 0.3 mm (thin paper) and a basis weight 10 to 25 g / m ² approximately, a thickness of about 0.1 to 0.3 mm Non-woven fabrics (especially spunbond nonwoven fabrics having a spunbond fineness of about 1.0 to 3.0 dtex, and laminated nonwoven fabrics having a melt-blown nonwoven fabric layer between the spunbond nonwoven fabric layers (for example, SMS nonwoven fabric, SMMS nonwoven fabric, etc.)). it can. When crepe paper is used, the crepe rate is preferably about 5 to 20%, particularly about 5 to 15%. If the crepe rate is 20% or more, the amount of ink fixed increases, but blurring occurs and is not suitable for design printing. If the crepe rate is 5% or less, the amount of fixing is small because the ink hardly penetrates.

  Although the size and shape of the printing sheet 25 are not particularly limited, for example, the width 25X of the printing sheet 25 is preferably about 50 to 120% of the width of the absorber 56, and the length 25Y of the printing sheet 25 is at least on the ventral side. In addition, it is preferably about 15 to 30% of the total length Y of the article on one side on the back side. Further, the shape of the print sheet 25 is preferably a rectangle as shown in the figure in that trim loss does not occur. You may cut it.

<Example of tape-type disposable diaper structure>
10 to 15 show an example of a tape-type disposable diaper. 12 and 13 are views showing a cross section taken along line 6-6 and 7-7 in FIG. 10, respectively, and FIGS. 14 and 15 are cross sections taken along line 8-8 and 9-9 in FIG. FIG. This tape-type disposable diaper is a portion that extends from the lower abdomen along the center in the width direction through the crotch to cover the buttocks, and a liquid-permeable top sheet that forms the body side surface, and the outer surface side An absorbent main body 10 which is a part where the absorbent body 56 is interposed between the liquid-impermeable back sheet located in the front part and a rear side of the absorbent main body part 10, respectively. And it has the abdominal side end flap part FE and back side end flap part BE which are parts which do not have the absorber 56. FIG.

  The tape-type disposable diaper includes a pair of abdominal side flap portions FF, FF extending to the outside in the width direction from the crotch portion C on both sides of the upper edge F1 side portion of the abdominal side F, and a back side B. On both sides of the upper edge B1 side portion, a pair of back side flap portions BF, BF extending to the outside in the width direction from the crotch portion C are provided. Moreover, the fastening tape 130 as a locking member is provided in the back side flap part BF and BF, respectively.

  More specifically, the entire outer surface of the absorbent main body 10 and the side flap portions BF and FF on the back side and the abdomen side is formed by the exterior sheet 12. In particular, in the absorbent main body 10, a liquid-impermeable back sheet 11 is fixed to the inner surface side of the exterior sheet 12 with an adhesive such as a hot melt adhesive, and further to the inner surface side of the liquid-impermeable back sheet 11. The absorber 56, the intermediate sheet 40, and the top sheet 30 are laminated in this order. The top sheet 30 and the liquid-impermeable back sheet 11 are rectangular in the illustrated example, have slightly larger dimensions in the front-rear direction and the width direction than the absorbent body 56, and from the side edges of the absorbent body 56 in the top sheet 30. The peripheral edge that protrudes and the peripheral edge that protrudes from the side edge of the absorbent body 56 in the liquid-impermeable back sheet 11 are fixed by a hot melt adhesive or the like. The liquid-impermeable back sheet 11 is made of a moisture-permeable polyethylene film or the like, and is formed slightly wider than the top sheet 30.

  Further, on both sides of the absorbent main body 10, side solid gathers 60, 60 that protrude (stand up) toward the wearer's skin are provided, and the gather sheets that form the side solid gathers 60, 60 are provided. 62 and 62 are extended over the whole width direction outer side of the absorptive main-body part 10 including the inner surface of each side flap part BF and FF of back side and abdominal side.

Hereinafter, the material of each part will be described in order.
(Exterior sheet)
The exterior sheet 12 is a part constituting the outer surface of the article. The exterior sheet 12 has an hourglass shape in which the center portions in the front-rear direction on both sides are constricted, and this is a portion that fits around the legs of the wearer. The exterior sheet 12 is preferably a non-woven fabric, but is not limited thereto. As a nonwoven fabric, since the thing similar to the sheet | seat base materials 12S and 12H of the exterior sheet | seat 12 of the underpants type disposable diaper mentioned above can be used, it abbreviate | omits description here.

(Impermeable back sheet, top sheet and intermediate sheet)
As the liquid-impermeable back sheet 11, the top sheet 30, and the intermediate sheet 40, since the same thing as the above-mentioned pants-type disposable diaper can be used, the description will be omitted here. The top sheet 30 and the intermediate sheet 40 may be omitted.

(Absorber)
The absorber 56 will be described later. The absorber 56 can be bonded to the inner surface of the liquid-impermeable back sheet 11 via an adhesive such as a hot melt adhesive on the back surface.

(Side three-dimensional gather)
In order to prevent urine and soft stool that move laterally on the top sheet 30 and prevent side leakage, side solid gathers 60 and 60 that protrude (stand up) on the use surface side are provided on both sides of the product. Is preferred.

  The side three-dimensional gather 60 includes a gather sheet 62 that is substantially continuous in the width direction, and an elongated elastic elastic member 63 that is fixed to the gather sheet 62 in a stretched state along the front-rear direction. The gather sheet 62 and the elastic stretchable member 63 can be the same as those of the above-described pants type, and a plurality of elastic stretchable members 63 are provided as shown in FIGS. be able to.

  The inner surface of the gather sheet 62 has a fixing start end in the width direction on the side portion of the top sheet 30, and a portion on the outer side in the width direction from the fixing start end is a side portion of the liquid-impermeable back sheet 11 and the outer side in the width direction. Is fixed to a side portion of the exterior sheet 12 located at a position by a hot melt adhesive or the like. Out of the fixing portions, on the outer side in the width direction near the fixing start end, elastic elastic members 64 around the legs made of rubber thread or the like are provided along the front-rear direction between the sheets where the gather sheet 62 and the exterior sheet 12 face each other. It has been.

  Around the legs, the width direction inner side from the fixing start end of the side three-dimensional gather 60 is fixed on the top sheet 30 at both ends in the product front-rear direction, but the portion between them is an unfixed free part. The portion comes to stand by the contraction force of the rubber thread 63. When the diaper is worn, the diaper is attached to the body in the shape of a boat, and the contraction force of the rubber thread 63 acts. Therefore, the side three-dimensional gather 60 stands up due to the contraction force of the rubber thread 63 and comes into close contact with the legs. . As a result, so-called side leakage from around the legs is prevented.

  Unlike the illustrated embodiment, the front and rear direction end portions of the gather sheet 62 on the inner side in the width direction are divided into a base end side portion extending from the outer side in the width direction to the inner side in the width direction, and It is also possible to fix in a double-folded state having a distal end side portion that is folded back from the edge toward the body side and extends outward in the width direction, and the portion in between can be an unfixed free portion.

(Fastening tape)
The fastening tape 130 has a base portion of a fastening base material 130C made of a nonwoven fabric, a plastic film, a polylaminated nonwoven fabric, paper, or a composite material thereof attached to the diaper. A hook material 130A for a mechanical fastener is provided. The hook material 130A is bonded to the fastening base material 130C by an adhesive so as not to be peeled off.

  In particular, in a diaper for infants up to about 12 months that frequently excretes watery stool and soft stool, among the dimensions of the attachment portion of the fastening tape 130, the length X1 in the width direction of the diaper is 10 to 50 mm, especially The length Y1 is preferably 20 to 40 mm, and the length Y1 in the front-rear direction is preferably 20 to 100 mm, and particularly preferably 40 to 80 mm. Of the dimensions of the front end portion of the fastening tape 130, the length in the width direction of the diaper is preferably 30 to 80 mm, particularly preferably 40 to 60 mm, and the length (height) in the front-rear direction is 20 to 70 mm. In particular, the thickness is preferably 25 to 50 mm. In addition, when a part or all of the fastening tape 130 has a substantially tapered shape, for example, and the length in the front-rear direction and the length in the width direction are not constant, the numerical range is determined by an average value. The shape of the fastening tape 130 may be a symmetric shape such as a rectangular shape, but if it is a convex shape consisting of a wide attachment portion and an elongated tip side portion, the knob on the tip side portion is easy to pick and This is preferable because the tension between the bases of this region acts over a wide range. The hook member 130A has a large number of engaging protrusions on the outer surface side. The shape of the engaging protrusion is (A) Le-shaped, (B) J-shaped, (C) Mushroom-shaped, (D) T-shaped, (E) Double J-shaped (J-shaped And the like may be any shape. Instead of the hook material 130 </ b> A, an adhesive material layer can be provided as a locking portion of the fastening tape 130.

  When the diaper is mounted, the fastening tape is locked at a proper position on the outer surface of the abdominal side F with the back side flap portion BF being overlapped on the outside of the abdominal side flap portion FF. The position and size of the fastening portion of the fastening tape 130 can be arbitrarily determined. In diapers for infants up to about 12 months from the newborn, the locking location is a rectangular range of 20 to 80 mm in the front-rear direction and 150 to 300 mm in the width direction, and the distance in the height direction between the upper edge and the ventral upper edge is 0 ˜60 mm, particularly 20˜50 mm, and the center in the width direction of the product is preferable.

  When the fastening tape 130 is attached so that the attachment portion of the fastening tape 130 overlaps the boundary line between the back end flap portion BE and the absorber 56, the fastening tape 130 acts between the attachment portions of the left and right fastening tapes 130 when the diaper is attached. The back end of the absorbent body 56 is firmly pressed against the body by the tension, which is preferable. Moreover, if the attachment part of the fastening tape 130 is too far from the back side end part (rear end part) of the diaper, the tension acting between the attachment parts of the left and right fastening tapes 130 when the diaper is mounted is the back side end part of the diaper. Therefore, a gap is likely to occur between the back end of the diaper and the body surface. Therefore, the length in the front-rear direction of the back end flap BE is preferably the same as or shorter than the length in the front-rear direction of the base portion of the fastening tape 130.

(Target print sheet)
It is preferable to provide a target printing sheet 74 having target printing for facilitating the locking at the locking portion of the fastening tape 130 on the ventral side F. When the locking portion is the hook material 130A, the target print sheet 74 may be one in which a large number of loop yarns on the surface of a base material sheet made of a plastic film or a nonwoven fabric that entangle the engagement projections of the hook material are used. In the case of an adhesive layer, a surface of a base material sheet made of a plastic film having a smooth surface that is rich in adhesiveness can be used. Here, the target printing is preferably performed on the base sheet.

  Further, when the fastening portion of the fastening tape 130 on the ventral side F is made of a nonwoven fabric, for example, when the exterior sheet 12 of the illustrated form is made of a nonwoven fabric, and the fastening portion of the fastening tape 130 is a hook material 130A, The target tape 74 can be omitted, and the hook material 130A can be entangled with the nonwoven fabric of the exterior sheet 12 and locked. In this case, the target print sheet 74 may be provided between the exterior sheet 12 and the liquid-impermeable back sheet 11.

(End flap)
The end flap part is a part that extends to the front side and the rear side of the absorbent main body part 10 and does not have the absorber 56, and the front side extension part is the ventral end flap part FE. The extended portion on the rear side is the back end flap portion BE.

  The length in the front-rear direction of the back end flap BE is preferably the same as or shorter than the length in the front-rear direction of the attachment portion of the fastening tape 130 for the reasons described above. If it is too close, a gap is likely to be formed between the diaper dorsal side end and the body surface due to the thickness and stiffness of the absorbent body 56, so that it is preferably 10 mm or more.

  The length in the front-rear direction of the ventral end flap part FE and the back end flap part BE is preferably about 5 to 20% of the length L in the front-rear direction of the entire diaper and frequently excretes watery stools and soft stools. In diapers for infants from newborns up to about 12 months, it is appropriate that the length is 10 to 60 mm, particularly 20 to 50 mm.

(Back elastic sheet)
In the illustrated embodiment, a belt-like back-side stretchable sheet 70 that elastically expands and contracts in the width direction is provided between both fastening tapes 130 to improve the fit on the back side of the diaper. Both end portions of the back-side elastic sheet 70 are preferably extended to a portion that overlaps with the attachment portions of both fastening tapes 130, but may be spaced apart in the center in the width direction. Although it is appropriate that the longitudinal dimension of the back side elastic sheet 70 is approximately the same as the longitudinal dimension of the attachment portion of the fastening tape 130, there may be a dimensional difference of about ± 20%. The back elastic sheet 70 may use a sheet-like elastic member such as a rubber sheet, but from the viewpoint of air permeability, as shown in FIG. 14, a sheet base 71 such as two nonwoven fabrics is used as a hot melt adhesive. The elastic elastic member 72 such as a perforated sheet, net, or elongated (thread or string) is stretched between the sheet base materials 71 in a state of being stretched along the width direction. What was used is used suitably. As the sheet base 71 in this case, the same one as the exterior sheet 12 can be used. It is preferable that the elastic expansion / contraction member 72 has an extension ratio of about 150 to 250%. In addition, when an elongated (stretch or string-like) member is used as the elastic elastic member 72, it is preferable to provide about 5 to 15 members having a thickness of 420 to 1120 dtex at intervals 72d of 3 to 10 mm.

  Further, as shown in the drawing, it is preferable that a part of the elastic expansion / contraction member 72 is arranged so as to cross the absorber 56, because the fit of the absorber 56 is improved. In this case, the elastic expansion / contraction member 72 is used as the absorber 56. If the contraction force is prevented from acting on a part or all of the overlapping portion by means such as cutting, the back end portion of the absorbent body 56 does not contract in the width direction, so that the fit is further improved.

  The elastic elastic member 72 may be fixed over the entire length of the sheet base material 71 in the longitudinal direction of the sheet (width direction of the diaper), but in order to prevent the sheet from shrinking or curling when attached to the diaper body, In the range of about 5 to 20 mm at the end in the front-rear direction (diaper width direction), it is preferable that the contraction force does not work or the elastic elastic member 72 does not exist.

  In the illustrated form, the back-side elastic sheet 70 is sandwiched between the gather sheet 62 and the exterior sheet 12 on both sides in the width direction of the liquid-impermeable back sheet 11 and overlaps the liquid-impermeable back sheet 11. Although provided so that it may be pinched | interposed between the liquid-impermeable back sheet 11 and the absorber 56, between the top sheet 30 and the absorber 56, or between the liquid-impermeable back sheet 11 and the exterior sheet 12. It may be provided on the top sheet 30. In this case, the impermeable back sheet 11 may be provided on the gather sheet 62 on both sides in the width direction. Further, when the exterior sheet 12 is formed by stacking a plurality of sheet base materials, the entire back-side stretchable sheet 70 may be provided between the sheet base materials of the exterior sheet 12.

<Example structure of absorber>
Now, as shown in FIGS. 3 to 6 and FIGS. 14 to 15, the absorbent body 56 in the disposable diaper described above is disposed on the first sheet 57 disposed on the back sheet side and on the top sheet side . The second sheet 58 includes a large number of ridges 58 </ b> F extending in the front-rear direction or the width direction, and the absorbent material 59 disposed between the first sheet 57 and the second sheet 58. The first sheet 57 and the first sheet side bottom of each flange 58F of the second sheet 58 are joined to each other by a hot melt adhesive, welding, or the like at a predetermined interval in a direction orthogonal to the juxtaposition direction of the flanges 58F. As a result, a joining portion 56b is formed, and between the joining portions 56b, the first sheet 57 and the second sheet 58 are not joined to form a tunnel-like cell 56C, and an absorbent material 59 is enclosed in each cell 56C. It is what has been. The first sheet 57 and the second sheet 58 are bonded to each other at both ends in the longitudinal direction of each cell 56C by a hot melt adhesive, welding, or the like 56f, and each cell 56C is sealed.

  Each ridge 58F of the second sheet 58 is not laid irregularly or laid down in a plurality of directions, but is laid down in one direction, and the cell 56C is in a crushed state (falling state). As the absorbent 56 swells, the cells 56C also expand and expand. As described above, when the flanges 58F of the second sheet 58 in the absorbent body 56 are provided in a state where they are laid down in one direction, the absorbent body 56 before absorption becomes very uniform and thin, so that a feeling of wearing and a feeling of touch can be obtained. In addition to being excellent, the volume of the cell 56C expands smoothly during absorption, so that absorption inhibition is less likely to occur. Of course, since the powdery absorbent material 59 is distributed and enclosed in a large number of cells 56C as in the prior art, even if the absorbent material 59 is used in a large amount and the amount of absorption is increased, the absorbent material 59 is unevenly distributed. Absorption of absorption and absorption inhibition are prevented. Further, at the time of non-absorption (before absorption), the apparent volume of the absorbent material 59 enclosed therein is smaller than the maximum volume in each cell 56C, and each of the volumes sufficient for the absorbent material 59 to swell is provided. Secured in the cell.

  If the absorber 56 is provided so that the 2nd sheet | seat 58 may become the surface side like the illustration form, the 1st sheet | seat 57 and the 2nd sheet | seat 58 of the absorber 56 with the collar 58F of the 2nd sheet | seat 58 are provided. The surface area on the surface side (liquid receiving surface side) increases, and the absorption rate is excellent.

  Further, as shown in FIG. 19, the direction of the ridges 58F of the second sheet 58 may extend along the longitudinal direction of the article as shown in FIG. As shown, it may extend along the article width direction. In any case, since each of the ridges 58F serves as a weir that blocks movement of excrement, the diffusibility in the extending direction of the ridge 58F is improved, and leakage in the direction intersecting with the extending direction of the ridge 58F. Is less likely to occur. However, if the flange 58F of the second sheet 58 extends along the width direction, the size of each cell 56C becomes smaller than the case where it extends in the front-rear direction. Even if 59 moves, there is an advantage that the degree of uneven distribution is relatively small. The lying direction of the cell 56C can be determined as appropriate. When the second sheet 58 is on the surface side and the flange 58F of the second sheet 58 extends along the width direction as shown in the figure, the front side However, if you lie down, the diffusion of excrement is promoted to the rear side rather than the front side. This is preferable because urine leakage from the urine is prevented.

Of the first sheet 57 and the second sheet 58, at least the sheet on the top sheet side (the second sheet 58 in the illustrated example) may be liquid-permeable, but both are liquid-permeable. Is preferred. As the liquid-permeable material, a nonwoven fabric, a sheet with a small hole, tissue paper, particularly crepe paper, and the like can be used, and a sheet from which the superabsorbent polymer particles do not escape is desirable. When using a nonwoven fabric, hydrophilic ones (including those provided with a hydrophilic agent) are preferred. Among nonwoven fabrics, laminated nonwoven fabrics having a meltblown nonwoven fabric layer between spunbonded nonwoven fabric layers (for example, SMS nonwoven fabric, SMMS nonwoven fabric, etc.) are particularly suitable, and polypropylene, polyethylene / polypropylene composites, etc. can be used as the material. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² . As the liquid-impermeable material, the same material as the liquid-impermeable back sheet 11 described above can be used.

  The absorbent material 59 is a powdery granular material containing superabsorbent polymer particles, and if necessary, an absorbent material other than the superabsorbent polymer particles, for example, hydrophilic short fibers such as pulp fibers can be mixed. When importance is attached to the thickness and the amount of absorption, the superabsorbent polymer particles are preferably 80% or more, and more preferably only superabsorbent polymer particles.

  The superabsorbent polymer (SAP) particles are not particularly limited, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used.

  The particle size of the superabsorbent polymer particles is preferably 1000 μm or less, particularly 150 to 400 μm. In addition, as the superabsorbent polymer particles, those having a water absorption rate of 40 seconds or less are suitable. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur. Furthermore, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are suitable. Thereby, the sticky feeling after liquid absorption can be suppressed effectively.

  The dimension of each part can be determined as appropriate, but the separation distance B1 between the adjacent joints 56b in the juxtaposed direction of the flange 58F is the same maximum when the width A1 of the joint 56b in the juxtaposed direction of the collar 58F is larger. Even if the cell 56C having a volume is formed, the cell 56C can be formed relatively shallow, so that the ridge 58F on the surface of the absorber 56 does not become too large, and the expansion of the cell volume at the time of absorption becomes smoother, which is preferable. . In a normal case, the distance B1 between the joint portions 56b is preferably about 5 to 20 mm, and the width A1 of the joint portion 56b is preferably about 3 to 15 mm. Moreover, it is preferable that the parallel arrangement space | interval (A1 + B1) of the collar 58F is about 8-30 mm, and it is more preferable that it is about 10-20 mm.

  Further, in the second sheet 58 portion constituting each cell 56C, the length in the juxtaposition direction of the flanges 58F is preferably about 2 to 5 times the separation distance B1 between the joint portions 56b, and 2.5 to 4 More preferably, it is about double. In addition, as for the 1st sheet | seat 57 part which comprises each cell 56C, the length of the juxtaposition direction of the collar 58F is 1 time of the separation distance B1 between the junction parts 56b.

  Moreover, it is preferable that the dimension in the article width direction of each cell 56 </ b> C is about 70 to 100% of the width of the absorber 56. In particular, as shown in FIG. 18, when the cell 56 </ b> C reaches both sides of the absorbent body 56 in the crotch portion, both sides of the crotch portion expand at the time of absorption and the fitting property is reduced. The effect may be hindered. Therefore, as shown in FIGS. 6, 17, and 19, it is preferable to form regions 56 </ b> N that do not have cells 56 </ b> C on both sides of the crotch portion. The region 56N not having the cell 56C can be formed by crushing the ridges 58F of the second sheet and bonding the inner surfaces thereof with a hot-melt adhesive or welding 56g.

  For example, as shown in FIGS. 6 and 17, when the longitudinal direction of the cell 56C is along the width direction of the article, the length of the cell 56C located in the crotch portion is gradually shortened toward the middle in the front-rear direction of the crotch portion. It is preferable to do this. Such a structure can be formed by crushing both end portions 56e of the collar 58F of the second sheet over a longer range toward the middle in the front-rear direction of the crotch portion and joining the inner surfaces to each other. On the other hand, as shown in FIG. 19, when the longitudinal direction of the cell 56C is along the longitudinal direction of the article, the cell 56C located on both sides is discontinuous at the crotch portion, and the length of the discontinuous portion 56N is It is preferable to make it longer as it goes outward in the width direction. Such a structure can be formed by crushing the intermediate portion 56m of the second sheet collar 58F over a longer range in the width direction and joining the inner surfaces to each other.

  The arrangement of the cells 56C can be determined as appropriate. 20 to 25, the cell spacing (the degree of separation / overlap) and the absorbent / cell maximum volume ratio (the apparent volume at the time of absorption saturation of the absorbent enclosed in the maximum volume of each cell). The difference of the change at the time of absorption by the difference was shown typically. In each figure, the uppermost figure shows the manufacturing stage, and the second figure from the top shows the state before absorption (however, for ease of understanding, 襞 58F stands slightly). The third figure shows the state in which the absorbent material 59 is swollen (however, the intermediate state before the absorption saturation), and the lowermost figure shows the state in which the absorbent material 59 has been saturated with absorption.

  As shown in (b-1) to (b-3), (c-1) to (c-3), and (d-1) to (d-3) in FIGS. The cells 56C are preferably formed so as to partially overlap the adjacent cells 56C in a lying state. As shown in (a-1) to (a-3) in FIGS. 20 to 25, if the cells 56 </ b> C are too far apart, a portion not having the absorbent material 59 is formed between the adjacent cells 56 </ b> C. Although there is a possibility that the absorption performance is lowered such that it is difficult to ensure or the absorption speed is slow, such a decline in absorption performance can be prevented if the cells 56C partially overlap each other. In addition, if the cells 56C are too far apart, a relatively large step is formed between the portion without the cell 56C and the cell 56C portion, which may adversely affect the feeling of wearing and touch.

However, as shown in (d-1) to (d-3) in FIGS. 20 to 25, when the double portions of the second sheets 58 of the adjacent cells 56 </ b> C overlap in the lying state, the portions are excessive. In addition, the gap between the second sheet 58 and the first sheet 57 is widened, and the absorbent material 59 is easy to move. In addition, since the cells 56C are densely packed, there is a possibility that the smooth expansion of the cells 56C may be hindered due to interference with the adjacent cells 56C at the time of absorption, and the expansion in the thickness direction is biased, and the thickness after absorption is unnecessary. It is not preferable because it increases. Therefore, from this viewpoint, as shown in (b-1) to (b-3) and (c-1) to (c-3) in FIGS. Of the double portion of the second sheet 58 formed in the cell 56C and the single portion of the second sheet 58, the double portion 58 does not overlap the double portion of the second sheet 58 formed in the adjacent cell 56C. It is preferable that it is formed.
In addition, although the space | interval of the cell 56C may be partially narrowed or widened in the parallel arrangement direction of the collar 58F, it is preferable that it is constant from a viewpoint of manufacturability.

  On the other hand, the maximum volume ratio of the absorbent material / cell can be achieved by changing the size of the cell 56C, the type of the absorbent material 59 (particularly, the difference in expansion ratio at the time of saturated absorption), the usage amount of the absorbent material 59, etc. It can be determined accordingly. When the absorbent / cell maximum volume ratio is 70 to 120%, (a-1) to (a-2), (b-1) to (b-2), and (c-1) in FIGS. ) To (c-2) and (d-1) to (d-2), in many cases, while suppressing the swelling inhibition of the absorbent material 59, the amount of absorption is reduced to the conventional level. Since it can improve notably compared with an absorber, it is preferable.

  Here, in order to provide a sufficient margin for the amount of absorption, the absorbent / cell maximum volume ratio is preferably 100% or more. In this case, however, swelling inhibition occurs when the absorbent material 59 in the cell 56C reaches the absorption saturation. It is not preferable to absorb to such a state, but rather, when such a state is reached, adjacent cells 56C come into contact with each other and absorption inhibition occurs (excrement is on the back side of cell 56C). It is more difficult to wrap around or the expansion of the adjacent cell 56C is hindered). Therefore, especially when the maximum volume ratio of the absorbent / cell is 100% or more, (a-1) to (a-3) and (b-1) to (b-3) in FIGS. As shown, when each cell 56C is in a maximum volume state, it is preferable that adjacent cells 56C are arranged so as not to touch each other.

  Particularly in this case, as shown in (b-1) to (b-3) in FIGS. 20 to 25, when each cell 56C is in the maximum volume state, the cells 56C in the juxtaposed direction of the flange 58F are arranged. When the width B4 (see FIG. 20 (a)) is formed with a dimensional ratio that is larger than the separation distance A4 (see FIG. 20 (a)) between the adjacent cells 56C in the juxtaposed direction of the flange 58F, Even if the cells 56C having the same maximum volume are formed, it is preferable because the space between the cells 56C after absorption is not too large and the unevenness of the absorber 56 after absorption is less.

  On the other hand, the absorption material / cell maximum volume ratio is less than 100%, that is, the configuration in which the cell 56C does not expand to the maximum volume even when the absorption material 59 is saturated in absorption is that the swelling inhibition of the absorption material 59 does not occur in principle. One preferred form. (A-3) to (d-3) in FIGS. 24 and 25 are based on the assumption that the absorbent / cell maximum volume ratio is about 70%. When the maximum cell volume ratio is less than 100%, the adjacent cells 56C are formed so as to partially overlap in the lying state, and the overlapping width A2 ′ of the adjacent cells 56C in the juxtaposed direction of the ridges 58F is: When the width is larger than the width A1 of the joint portion in the juxtaposed direction of the flanges 58F, the overlapping width of the adjacent cells 56C becomes sufficiently wide, and the cell 56C can maintain a state of overlapping with the adjacent cells 56C until a certain amount of absorption. Therefore, excrement can be supplied to more cells 56C, the use efficiency of the absorber 56 is good, and the amount of absorption per unit area is not reduced.

  In particular, in the absorbent article, the absorbent material 59 often absorbs up to a saturated state at and near the excretion site of the wearer's excrement, so the absorbent material 59 is saturated and absorbed at least in the cell 56C of this site. It is also a preferable form that sometimes the maximum volume in the cell 56C is not exceeded, specifically, the absorbent / cell maximum volume ratio is about 80 to 100%.

The amount of the absorbent material 59 used is preferably determined as appropriate based on the relationship between the apparent volume at the time of absorption saturation of the absorbent material 59 and the maximum volume of the cell 56C, but from the viewpoint of the amount of absorption, the unit area of the absorbent body 56 It is preferable to secure 100 g / m ² or more, particularly 150 g / m ² or more in terms of per content.

  If necessary, the amount of encapsulating material 59 can be adjusted for each cell 56C. For example, the amount of the excretion site can be increased more than other sites. When gender differences are taken into account, men can increase the amount of the front side and women can increase the amount of the center portion. Moreover, the cell 56C in which the absorbent material 59 does not exist locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

  On the other hand, when each ridge 58F of the second sheet 58 in the absorbent body 56 is unfixed so that the whole can stand and fall freely, if the ridge 58F is disturbed in the manufacturing process or the distribution process, In addition to a decrease in value, smooth expansion of the cell 56C becomes difficult, which may adversely affect the absorption performance. A particular problem is that it is easily affected by the uneven distribution of the absorbent material 59 in the cell 56C. When the absorbent material 59 is non-fixed and movable, it moves downward in the vertical direction in the cell 56C due to gravity depending on the direction of the cell 56C during the product distribution process or in use. For example, when the cell 56C extends along the article width direction and lies on the rear side as shown in the figure, the width direction of the cell 56C depends on the storage direction of the diaper and the movement of the wearer. The absorbent material 59 may be biased at the end on one side. When such a situation occurs, leakage occurs due to a local decrease in absorption performance in a portion where the absorbent material 59 is small or a thickness of the absorber locally increases in a portion where the absorbent material 59 is large. There was a risk of wearing or worsening the wearing feeling. In particular, as shown in the figure, when the cell 56C extends along the article width direction and the absorbent material 59 is biased toward the end of the cell, the thickness at the time of absorption in this portion increases. Even if the three-dimensional gather 60 is present, the height thereof is relatively low, and it is easy to leak over the three-dimensional gather.

  Therefore, in the illustrated embodiment, each flange 58F of the second sheet 58 in the absorbent body 56 is not fixed (or peeled) so that both end portions 56e are fixed in a lying state and an intermediate portion between the fixed portions 56e can stand up. It may be fixed as possible).

  As shown in FIG. 17, the flanges 58F are fixed by simply joining the outer surfaces of the flanges 58F, which are in contact with each other at both ends 56e of the second sheet 58F of the second sheet, to the hot melt adhesive or welding from 56h or the like. However, it is not preferable to consume a limited absorber installation area in a fixed portion that hardly contributes to such absorption. Therefore, the following structure is also proposed.

  As shown in FIG. 3 and FIG. 16B, the first fixing structure is configured such that both sides 56 e in the width direction of the absorbent body 56 are folded back so that a hot melt adhesive or By fixing by welding means 56i such as welding, both end portions 56e of the flanges 58F of the second sheet 58 are fixed in a lying state. By adopting such a fixing structure, each cell 56C can expand and stand up to its both end edges, that is, over the full width of the absorber 56. As shown in FIG. 16D, the joining means 56i for the back surface of the absorber 56 is omitted, and the folded portion 56e of the absorber 56 is provided on the back surface side adjacent member, that is, the liquid-impermeable sheet 11 in the illustrated embodiment. It is the same even if it is fixed by a joining means such as hot melt adhesive or welding. The width of the folded portion 56e is suitably about 10 to 25 mm, and the width of the joining means 56i is suitably about 0 to 15 mm. This first structure is suitable for a pants-type disposable diaper, a pad-type disposable diaper, or the like that has no or little flap portion protruding around the absorber 56.

  On the other hand, as shown in FIG. 16A, both side portions in the width direction of the absorbent body 56 are folded back to the front side, and the surface of the absorbent body 56 is connected to the surface of the absorbent body 56 via a joining means 56 i such as hot melt adhesive or welding. It is also possible to adopt a structure in which both end portions 56e of each flange 58F of the second sheet are fixed in a lying state by being fixed. In this second structure, each cell 56C is restrained from expanding in the range of the folded portion 56e that is folded back and fixed to the surface side and hardly expands, but the other range, that is, the width of the absorber 56 is almost the same. In the full range, it will be able to expand and stand up. Further, if the joining means 56i to the surface of the absorber 56 is not formed up to the edge of the folded portion 56e, and the edge of the folded portion 56e is separated from the surface of the absorber 56, the folded portion is formed on both sides in the width direction of the absorber 56. There is an advantage that a weir by 56e is formed and the side leakage prevention function is exhibited. Then, as shown in FIGS. 16 (e) and 27, when the joining means 56i to the surface of the absorber 56 is completely omitted, the folded portion 56e floats with respect to the surface of the absorber 56 due to the bending repulsive force of the sheet. As a result, the weir by the folded portion 56e becomes higher and deeper, and each cell 56C can expand and stand up over the full width of the absorber 56. When the folded portion 56e is used as a weir for preventing side leakage, the folded portion 56e separated from the surface of the absorbent body 56 is placed on the surface side adjacent member, that is, the top sheet 30 in the illustrated embodiment, and the folded portion 56e of the absorbent body 56 is used. Is preferably fixed by a joining means such as hot melt adhesive or welding. The width of the folded portion 56e is suitably about 10 to 25 mm, and the width of the joining means 56i is suitably about 0 to 15 mm. This second structure is also suitable for a pants-type disposable diaper, a pad-type disposable diaper, or the like that has no or few flaps that protrude around the absorber 56.

  Also, as shown in FIG. 12, a member that overlaps the entire front-rear direction of both side portions in the width direction of each flange 58F of the second sheet 58 on the second sheet 58 side of the absorbent body 56, such as the top sheet 30 in the illustrated embodiment, In the case where there is a second sheet side member such as the gather sheet 62, the both sides in the width direction of the absorbent body 56 over the entire front and rear direction via the joining means 56j such as hot melt adhesive or welding to the second sheet side member. It is also possible to fix the both ends 56e of each flange 58F of the second sheet in a lying state. In this third structure, as shown in FIG. 16C and FIG. 28, since there is no folded portion 56e on both sides of the absorber 56, a uniform thinness can be obtained over the entire width of the absorber. Can do. Furthermore, since both ends of the flange 58F can be fixed without folding both sides of the absorbent body 56, the manufacturing process is simplified.

  In particular, as shown in FIG. 12, the first sheet side member (the back sheet 11 and the exterior sheet in the illustrated embodiment) overlaps with the first sheet 57 side of the absorbent body 56 over the entire front and rear direction on both sides in the width direction of the absorbent body 56. 12), and the first and second sheet side members protrude from the peripheral edge of the absorber 56, the both sides of the absorber 56 are sandwiched between the first and second sheet side members. It is also preferable to fix the both ends 56e of each ridge 58F of the second sheet in a lying state by fixing via a joining means 56k such as a hot melt adhesive or welding. This third structure is suitable for a tape-type disposable diaper having a flap portion that protrudes around the absorber 56, a pad-type disposable diaper, and the like.

  In the absorbent body 56 thus configured, the cell 56C is located at both ends of the cell 56C, as can be seen from the main part after absorption shown in the upper part of FIG. 3 and the expansion line shown by the two-dot chain line in FIGS. Although it cannot expand, it has an expanded shape in which the expandable amount in the thickness direction increases from both ends toward the center. Therefore, even if the absorbent material 59 is unevenly distributed at the end of the cell 56C, the absorbent material 59 has a larger expandable amount in the thickness direction during the absorption expansion, and moves toward the center side of the cell 56C that is more easily expanded. However, it will gradually expand. As a result, it is difficult for a portion where the absorbent material 59 is locally small or large in the cell 56C to be generated, and it is difficult to cause leakage or deterioration of the wearing feeling. In particular, as shown in the figure, even when the cell 56C extends along the article width direction, the thickness of both ends of the cell 56C hardly increases, so that a deep pocket is formed between the three-dimensional gather 60. And the leakage prevention function of the three-dimensional gather 60 is fully exhibited.

  However, even if such an effect is obtained, the uneven distribution of the absorbent material 59 in the cell 56C itself cannot be prevented as long as the absorbent material 59 is not fixed and can freely move in the cell 56C. In order to prevent this, part or all of the absorbent material 59 can be fixed to the second sheet 58 or the first sheet 57 with a hot-melt adhesive or the like, but the fixed absorbent material 59 is less likely to swell. In addition, the fixed absorbent material 59 inhibits the movement of the other absorbent material 59, inhibits the expansion of the other absorbent material 59, and inhibits the uneven distribution of the absorbent material 59 due to the movement of the absorbent material 59. Therefore, in the illustrated form, the adhesive layer 56t is provided on the portion of the first sheet 57 exposed on the cell inner surface. Providing such an adhesive layer 56t makes it difficult for the absorbent material 59 to move due to the adhesive force (including frictional force) of the adhesive layer 56t, and also makes it difficult for the absorbent material 59 to move to move other absorbent materials 59. Will be blocked. The proportion of the absorbent material 59 held by the adhesive layer 56t is preferably about 30 to 80% by weight.

  If the adhesiveness (tackiness) of the adhesive layer 56t is more than a certain level, the absorbent material 59 is firmly adhered and held, and swelling inhibition occurs, or the ridges 58F of the second sheet 58 are adhered to the adhesive layer 56t of the first sheet 57. There is a possibility that the expansion of the cell 56C may be inhibited. Moreover, if the adhesiveness of the adhesive layer 56t is too weak, the effect of preventing the movement of the absorbent material 59 becomes poor. Therefore, the adhesive layer 56t preferably has a loop tack adhesive strength of 5 to 40 N / 25 mm, particularly 15 to 30. Such a pressure-sensitive adhesive layer 56t can be formed by applying a rubber-based hot-melt pressure-sensitive adhesive such as a styrene-isoprene copolymer and a styrene-butadiene copolymer, an acrylic pressure-sensitive adhesive, or the like.

  The adhesive layer 56t may be provided partially, or may be provided in a pattern such as a dotted pattern, a staggered pattern, or the like. The sheet 57 is preferably provided over the entire portion exposed to the inner surface of the cell 56C. On the other hand, when the adhesive layer 56t is provided in the part exposed to the inner surface of the cell 56C in the second sheet 58, there is a possibility that the cell 56C is difficult to expand due to adhesion between the inner surfaces of the flanges 58F. Therefore, it is preferable that the adhesive layer 56t is not provided over the entire portion. In addition, when the absorbent material 59 is large, not all of the absorbent material 59 is held by the adhesive layer 56t, and hence the absorbent material 59 may be unevenly distributed. In such a case, the absorbent material 59 that is unevenly distributed on one side of the cell 56C gradually expands while moving toward the other side having an expandable space. Here, if the friction between the second sheet 58 corresponding to the upper surface inside the cell 56C and the absorbent material 59 is not strengthened, the movement of the absorbent material 59 during the absorption expansion is hardly hindered. Therefore, it is preferable not to provide the adhesive layer 56t on the portion of the second sheet 58 exposed to the inner surface of the cell 56C.

  The adhesive layer 56t can be formed alone, but if the joint portion and the adhesive layer 56t are integrally formed with the same adhesive, the joint portion and the adhesive layer 56t of the first sheet 57 can be formed at one time, and the manufacturing is performed. Is preferable because it becomes easy. That is, it can be manufactured by forming the adhesive layer 56t on substantially the entire surface of the first sheet 57 and bonding it to the second sheet 58 in which the absorbent material 59 is put in the flange 58F.

  In the mounted state, the absorbent material 59 is biased at the tip in the cell 56C located on the front side of the crotch, and the absorbent material 59 is biased on the tip of the cell 56C located on the rear side of the crotch. The uneven distribution of the absorbent material 59 has little effect on the absorption function.

  Further, in order to reduce the influence of uneven distribution of the absorbent material 59, the average surface friction coefficient MIU is set to 0.2 or less, particularly 0.05 to 0.15 in the portion exposed to the inner surface of the cell 56C in the second sheet 58, The variation deviation MMD of the surface friction coefficient is preferably 0.01 or less, particularly 0.003 to 0.008, and the surface roughness SMD is preferably 10 micrometers or less, particularly 3 to 7 micrometers. These are all numerical values related to the cell extending direction. As described above, when the friction between the portion exposed to the inner surface of the cell 56C in the second sheet 58 and the absorbent material 59 is somewhat weak, even if the absorbent material 59 is unevenly distributed in the cell 56C, the second sheet is subjected to absorption expansion. After contact with 58, it moves along the inner surface of the second sheet 58, the absorbent material 59 is likely to spread, and uneven distribution is reduced.

Further, if the superabsorbent polymer particles have a particle size of 1000 μm or less, the superabsorbent polymer particles enclosed in the cell 56C may come out from the second sheet 58 side. Therefore, the second sheet 58 is preferably a nonwoven fabric having a melt-blown nonwoven fabric layer between the spunbond nonwoven fabric layer and the spunbond nonwoven fabric layer, such as an SMS nonwoven fabric or an SMMS nonwoven fabric, and has a fiber basis weight of 5 to 20 g. / M ² , particularly 8 to 15 g / m ² , and a load at a load of 0.5 g / cm ² is preferably 0.05 to 0.25 mm, particularly preferably 0.10 to 0.20 mm. By using such a nonwoven fabric, it becomes difficult for the superabsorbent polymer particles enclosed inside to escape from the second sheet 58 side. Although the same nonwoven fabric is preferably used for the first sheet 57, other materials may be used on the first sheet 57 side because it is difficult for the superabsorbent polymer particles to escape due to the adhesive layer 56t.

  On the other hand, in order to prevent the top sheet 30 from leaning, it is preferable to fix the top sheet 30 to the absorber 56. However, when the collar 58F of the second sheet 58 is located on the top sheet 30 side, When a general fixing form is employed, when the cell 56C stands up while being swollen due to swelling of the absorbent material 59 at the time of absorption, the expansion and standing of the cell 56C may be hindered. Therefore, as shown in FIGS. 5, 14, 15, and 26, at least a portion between the fixing portions 56 b in the second sheet 58 of the absorbent body 56 has an interval corresponding to the arrangement interval of the cells 56 </ b> C in the front-rear direction. It is also proposed to intermittently join the top sheet 30. In this case, the joining portion 56d with respect to the top sheet 30 is preferably the tip of the collar 58F of the second sheet as shown in FIG. 26 (a), but somewhat as shown in FIG. 26 (b). Even if they are misaligned, if the spacing between the cells 56C and the spacing between the joint portions 56d of the top sheet and the absorber correspond to each other, the top sheet 30 can be prevented from leaning, but the cells 56C expand smoothly. To be able to stand up.

  INDUSTRIAL APPLICATION This invention can be utilized for absorbent articles in general, such as a pants type, a tape type, a pad type disposable diaper, and a sanitary napkin.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious back sheet, 12 ... Exterior sheet, 12r ... Folded part, 25 ... Print sheet, 200 ... Interior body, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 56C ... cell, 56b, 56d ... joint, 56t ... adhesive layer, 57 ... first sheet, 58 ... second sheet, 58F ... soot, 59 ... absorbent, 60 ... side solid gather, 62 ... gather sheet.

Claims (7)

In an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body interposed therebetween,
The absorbent body includes a first sheet disposed on the back sheet side, a second sheet disposed on the top sheet side and provided with a large number of ridges extending in the front-rear direction or the width direction, and the first sheet. An absorbent material disposed between the sheet and the second sheet, and at least the top sheet side of the first sheet and the second sheet has liquid permeability,
The first sheet and the first sheet side bottom of each ridge of the second sheet are joined to form a joined part, and the first sheet and the second sheet are not joined between these joined parts. Tunnel-shaped cells are formed, and the absorbent material is enclosed in each cell,
The adjacent joints are separated by a predetermined interval,
Wherein all folds of the second sheet, the entire respective folds either in one direction arrangement direction is set to the laid-down by one-way inclined state to fall, and the extending direction of the both end portions of each fold of the second sheet Is fixed in the one-way lying state, and the middle part between these fixed parts is configured to be able to stand up from the one-way lying state,
The absorbent material is a granular material containing at least superabsorbent polymer particles,
The apparent volume at the time of non-absorption of the absorbent material enclosed in the cell is small with respect to the maximum volume in each cell, and at least a part of the absorbent material in each cell is movable in the cell,
An adhesive layer is provided on the portion of the first sheet exposed to the cell inner surface,
An absorbent article characterized by the above.   The absorbent article according to claim 1, wherein the adhesive layer of the first sheet has a loop tack adhesive strength of 5 to 40 N / 25 mm. The pressure-sensitive adhesive layer is provided over the entire portion of the first sheet exposed on the inner surface of the cell , and the joint portion and the pressure-sensitive adhesive layer are integrally formed of the same adhesive. The absorbent article as described. The portion of the second sheet exposed to the inner surface of the cell has an average surface friction coefficient MIU of 0.2 or less, a variation coefficient MMD of the surface friction coefficient of 0.01 or less, and a surface roughness SMD of 10 micrometers or less. The absorbent article according to claim 3 . The superabsorbent polymer particles are particles having a particle size of 1000 μm or less,
The second sheet is a nonwoven fabric having a meltblown nonwoven fabric layer between the spunbond nonwoven fabric layer and the spunbond nonwoven fabric layer, having a fiber basis weight of 5 to 20 g / m ² and a thickness of 0.05 to 0.25 mm. The absorbent article according to claim 4 .   2. The absorbent article according to claim 1, wherein the absorbent body is provided such that wrinkles of the second sheet extend along a width direction. The separation distance between the adjacent joints in the juxtaposed direction of the ridges is configured to be larger than the width of the joints in the juxtaposed direction of the heels,
Two of the double portion of the second sheet and the single portion of the second sheet that are formed in at least some of the cells in the lying state and at least some of the cells partially overlap with adjacent cells. The overlapping portion is formed so as not to overlap the double portion of the second sheet formed in an adjacent cell,
The absorbent article of Claim 6 whose apparent volume at the time of absorption saturation of the absorber enclosed inside with respect to the maximum volume in each said cell is 70 to 120%.

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