JP4988456B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as disposable diapers and absorbent pads for the purpose of preventing pressure sores (bed slip).

Pressure ulcers tend to occur in people who are bedridden, those who cannot move their wheelchairs, or who cannot change their body orientation or position, especially in areas where bones are raised and subject to pressure, such as waist and hips. This is likely to occur. The direct cause of pressure ulcers is the cessation of blood flow due to local pressure, but if the skin is left exposed to moisture such as urine and stool for a long time, the surface of the skin becomes weak and damaged. As a result, pressure ulcer is likely to occur.
JP 2007-54279 A JP 2006-149571 A

However, in the conventional absorbent article, when urinating, the sacrum and the coccyx, which are particularly susceptible to pressure ulcers, get wet with urine, and pressure ulcers are likely to occur. More specifically, in the conventional absorbent article, a gap is easily created between the body and the article in the crotch region. In particular, since an absorbent article that has absorbed urine is pulled downward under its own weight, such a gap is inevitable. In addition, such a gap is rather preferable from the viewpoint of using up the entire absorbent body by spreading urine over all of the absorbent body existing in substantially the whole from the ventral side to the back side. However, from the viewpoint of pressure ulcer prevention, the design concept of liquid diffusion in such a normal absorbent article is revealed.
Then, the main subject of this invention is providing the absorptive article excellent in prevention of the pressure ulcer by the urine contamination of the body back side (especially sacrum part and coccyx part).

The present invention that has solved the above-described problems and the effects thereof are as follows.
<Invention of Claim 1>
In an absorbent article in which an absorbent body composed of a fiber assembly is interposed between a liquid-permeable top sheet and an impermeable back sheet,
A crotch portion including a portion that is Ategawa the crotch has a ventral portion extending on the front side of the crotch portion, and a back side portion extending on the rear side of the crotch portion, and crotch portion and ventral portion thereof The absorber is provided so as to extend, and the absorber does not extend to the back side part,
On the left and right sides of the widthwise central portion of the crotch portion in the absorbent body, a first easy-bend portion extends linearly from the boundary with the ventral portion to the rear side of the article, respectively.
From the front end of the left first easy-bending part in the absorbent body to the left edge in the width direction, and from the front end of the right first easy-bending part in the absorber to the right edge in the width direction, respectively in the width direction The second easy-bend portion extends linearly within an angular range of ± 60 degrees ,
A moving layer in which an absorbent polymer is dispersed in a sheet-like fiber base material is laminated on the back side portion,
The moving layer is formed such that the absorbent polymer swells to reach one surface of the fiber base material through a void between fibers by gelation expansion due to liquid absorption to form a polymer layer on the fiber base material. Is composed of
The absorbent polymer bulging surfaces in adjacent moving layers are located facing each other, and are configured such that at least the formation of the polymer layer allows the adjacent moving layers to move in the shear direction between the layers .
An absorbent article characterized by the above.

(Function and effect)
As is apparent from the description below, the easy-bending portion of the present invention is a portion where the absorber is more easily bent than the adjacent portion. In the present invention, such an easily bent portion, firstly, on both the left and right sides of the central portion in the width direction of the crotch portion in the absorbent body, extends linearly from the boundary with the abdominal portion to the rear side of the article, Second, the width direction from the front end of the left first easy-bending part in the absorbent body to the left edge in the width direction, and the front end part of the right first easy-bending part in the absorbent body to the right edge in the width direction, respectively. In contrast, it is characterized by extending linearly within an angle range of ± 60 degrees.
In the present invention, the first easy-folding portion is mountain-folded when viewed from the body side, and the second easy-folding portion is valley-folded when viewed from the body side. On the other hand, it bulges to the body side, while the bulging part is supported on both the left and right sides, it adheres elastically to the body crotch, and it can withstand the weight after urine absorption and maintain adhesion, In the part where the abdomen part is located in front of the second easy-bend part, it stands on the body side with respect to the crotch part, fits well to the lower abdomen, and it is difficult to apply unnecessary force to the abdomen part Therefore, a situation in which a gap is generated in the crotch portion due to the displacement of the abdominal side portion is difficult to occur.
On the other hand, by constituting as in the present invention, the diffusion of urine to the dorsal side is prevented, so that the pressure ulcer prevention effect is further enhanced.
However, it is impossible to completely prevent urine from spreading to the dorsal side in all cases, and when such a situation occurs, pressure ulcers are likely to occur in the sacrum and tailbone. The present invention is to prevent the occurrence of such pressure sores as much as possible. In the present invention, when urine leaks into the dorsal portion, a gel-like polymer layer having a sufficient thickness is formed on the adjacent surface of each moving layer by liquid absorption. A body pressure dispersion effect is obtained due to an increase in tolerance of displacement in the shear direction between the moving layers. Furthermore, even when the skin is in pressure contact with the skin contact surface of the absorbent article while wearing the absorbent article, the moving layers can move in the shear direction, so the skin contact surface and the skin No strong frictional resistance is generated between the skin and the skin, and a strong shearing force is not generated between the relatively hard bones and muscles in the skin and the skin surface layer.
On the other hand, the surface opposite to the adjacent surface of the moving layers can be a surface on which the polymer layer is not formed, and can be fixed to the adjacent member using this surface to prevent unnecessary twisting and displacement of the moving layer. It is also possible.
Further, for example, if the moving layer is formed with a non-weighting layer having a substantial basis weight of the absorbent polymer of 0 g / m ² on the surface opposite to the swelled surface of the absorbent polymer, Due to the presence of the weighting layer, the gelled absorbent polymer in the wet state after liquid absorption is very difficult to swell to the skin contact surface side (surface side), and the polymer in the wet state at the time of liquid absorption is located far from the skin, Further, the feeling of wearing after liquid absorption can be improved.

<Invention of Claim 2>
The absorbent article according to claim 1, wherein the left and right first easy-bend portions have a widthwise interval of 60 to 200 mm and a longitudinal length of 50 to 300 mm.

(Function and effect)
The width between the left and right first easy-bend parts is set wider than the adult's crotch width (about 50-60 mm), the crotch width of the absorber is set sufficiently wider than that, and the length in the front-rear direction is sufficient. By ensuring the thickness, the crotch portion of the absorbent body is sandwiched and compressed by both legs, so that the bulging and elastic contact of the central portion in the width direction of the crotch portion of the article is naturally maintained.

<Invention of Claim 3>
The slit or the compression process part which continues from the side edge of the width direction one side of the absorber to the side edge of the other side is formed in the crotch part behind the 1st easy bending part. The absorbent article according to 1 or 2.

(Function and effect)
If such a slit or compression processing part is provided, the osmosis | permeation diffusion of the urine absorbed in the front side will be interrupted | blocked or dammed by the said slit or compression processing part. Therefore, since the diffusion of urine to the back side is prevented, the pressure ulcer prevention effect is further enhanced.

<Invention of Claim 4>
The ventral part of the absorbent body has a longitudinal length of 100 to 450 mm, a width of 150 to 400 mm, and an area of 15,000 to 180,000 mm ² .
The absorbent article according to claim 3, wherein the crotch portion of the absorbent body has a length in the front-rear direction of 150 to 500 mm, a width of 150 to 400 mm, and an area of 22,500 to 200,000 mm ² .

(Function and effect)
By forming it in the size range as described in this section, it is possible to secure a sufficient absorption area only in the crotch part and the abdominal part, and completely prevent or dam the diffusion of urine to the dorsal side to prevent pressure ulcers Even if the effect is remarkably improved, sufficient absorption capacity can be secured.

<Invention of Claim 5>
The absorptive article according to any one of claims 1 to 4 in which at least one of said 1st easy bending part and the 2nd easy bending part is a slit or a compression processing part.

(Function and effect)
Since the easy bending part of this invention is a slit or a compression process part as described in this clause, since manufacture is easy, it is preferable.

<Invention of Claim 6>
The absorber is formed by laminating an upper layer on a lower layer, and at least one of the first easy-folding portion and the second easy-folding portion overlaps the lower surface of the upper layer at the periphery of the lower layer or the upper layer. The absorbent article of any one of Claims 1-5 which is a part which overlaps with the upper surface of the lower layer in a periphery.

(Function and effect)
In the case where the absorber has a multi-layer structure, by causing one layer to protrude from the periphery of the other layer, the entire body is easily bent at the periphery of the other layer. Therefore, it is also a preferable form to form the easy-bending part of the present invention using such a structure.

  As described above, according to the present invention, there are advantages such as an absorbent article excellent in prevention of pressure ulcer due to urine contamination on the back side of the body (particularly the sacrum or tailbone).

  Below, although the example of an absorption pad is drawn and demonstrated, this invention is applicable also to various paper diapers, such as a fastening type or a pants type.

  1-3 show examples of absorbent pads according to the present invention. This absorbent pad is assumed to be used alone or laid on the inner surface of a disposable diaper. And a side portion B. The dimensions of each part can be determined as appropriate, the total length (length in the front-rear direction) L1 can be about 490 to 630 mm, and the total width can be about 280 to 320 mm. In this case, the length in the front-rear direction of the crotch M is 150. About 190mm, width is about 280-320mm, length in the front-rear direction of the ventral part F3 is about 110-150mm, width is about 150-320mm, and length in the front-rear direction of the back part B is about 110-150mm, width Can be about 110 to 320 mm. In particular, as shown in the figure, the width of the ventral part F is wider than the width of the dorsal part B (for example, about 50 to 100 mm), the ventral side of the crotch M is the same width as the ventral part F, and the dorsal side is the back. It is preferable that the width of the crotch portion M is changed in the middle portion in the front-rear direction so as to have the same width as the side portion B.

This absorbent pad has a basic structure in which an absorbent body 3 is interposed between the inner surface of a liquid-impermeable back sheet 2 having an outer sheet 12 laminated on the outer surface and the liquid-permeable top sheet 1. .
As the absorbent body 3, a laminate of pulp fibers, an aggregate of filaments such as cellulose acetate, or a non-woven fabric can be used, and an absorbent polymer mixed or fixed as necessary can be used. If necessary, the absorbent body 3 can be wrapped with crepe paper (not shown). Moreover, the shape of the absorber 3 can be made into an appropriate shape such as a strip shape in which the front side portion is wider than the rear side portion, a rectangular shape, or a trapezoidal shape as shown in the figure.
The fiber basis weight and the basis weight of the absorbent polymer in the absorbent body 3 can be appropriately determined. The fiber basis weight is preferably about 150 to 400 g / m ^2, and the basis weight of the absorbent polymer is about 150 to 420 g / m ^2. Is preferable.

  On the back side of the absorbent body 3, the liquid-impermeable back sheet 2 is provided so as to protrude slightly from the peripheral edge of the absorbent body 3. As the liquid-impermeable back sheet 2, a sheet having moisture permeability can be used without impairing the water barrier from the viewpoint of stuffiness prevention in addition to a polyethylene film or the like. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. Can be used.

  Moreover, the outer surface of the liquid-impermeable back sheet 2 is covered with an exterior sheet 12 made of a nonwoven fabric, and this exterior sheet 12 protrudes outside the periphery of the back sheet 2 with a predetermined protrusion width. Yes. Various nonwoven fabrics can be used as the exterior sheet 12. As the material fiber constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

  The surface side of the absorber 3 is covered with a liquid-permeable top sheet 1. Although the absorber 3 partially protrudes from the side edge of the top sheet 1 in the illustrated form, the width of the top sheet 1 can be widened so that the side edge of the absorber 3 does not protrude. As the top sheet 1, a perforated or non-porous nonwoven fabric or a perforated plastic sheet is used. As the material fiber constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

  At both ends in the front-rear direction of the absorbent pad, the exterior sheet 12 and the liquid-permeable top sheet 1 are respectively attached to the front and rear ends of the absorbent body 3 so as to extend to the front and rear sides. Is formed. On both sides of the absorbent pad, the exterior sheet 12 extends outward from the side edge of the absorbent body 3, and the width direction of the barrier sheet 4 is formed on the inner surface of the portion from the extended part to the side part of the top sheet 1. The outer portion 4x is affixed over the entire front-rear direction and constitutes a side flap portion SF where the absorber 3 does not exist. These bonding portions are shown as dot patterns in FIGS. 2 and 3, and can be formed by hot melt adhesive, heat sealing, or ultrasonic sealing. When the exterior sheet 12 is not provided, the liquid-impermeable back sheet 2 can be extended to the side flap portion SF instead of the exterior sheet 12 to form the outer surface side of the side flap portion SF.

As the material for the barrier sheet 4, a plastic sheet or a melt blown nonwoven fabric can be used. However, in terms of touch to the skin, a nonwoven fabric that is water-repellent treated with silicon or the like is preferably used.
A portion 4c on the center side in the width direction of the barrier seat 4 extends to the top sheet 1, and an elongated elastic member 4G is stretched along the front-rear direction at the end on the center side in the width direction. It is fixed with a melt adhesive or the like. As this elongated elastic member 4G, styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, etc., which are formed in a thread shape, a string shape, a belt shape, etc. Ordinarily used materials can be used.

  The barrier sheets 4 and 4 are fixed by being bonded to the inner surface of the article (in the illustrated form, the top sheet 1 surface and the exterior sheet 12 inner surface) over the entire front and rear direction, and the width direction center side. 4c is bonded and fixed to the inner surface of the article (top sheet 1 surface in the illustrated embodiment) at both ends in the front-rear direction, and fixed to the inner surface of the article (top sheet 1 surface in the illustrated embodiment) between both ends in the front-rear direction. It has not been. As shown in FIG. 24, this non-fixed portion is a portion that becomes a barrier portion that can stand up with respect to the inner surface of the article (the surface of the top sheet 1 in the illustrated embodiment), and the base end of the stand is in the width direction of the barrier sheet 4. It is located at the boundary between the outer fixed portion 4x and the inner portion 4c.

(Easy bending part)
Characteristically, as shown in FIG. 4, the first easy-to-fold part 3y is formed on the left and right sides of the center part in the width direction of the crotch part M in the absorbent body 3 from the boundary with the ventral part F to the rear side of the article. Is extended linearly, from the front end of the left first easy-to-bend part 3y to the left edge in the width direction in the absorbent body 3, and the front end of the right first easy-to-bend part 3y in the absorbent body 3 To the right side edge in the width direction, the second easy-bending portions 3x extend linearly.

  It is preferable that the left and right first easy-bend portions 3y have a width direction interval D1 of 60 to 150 mm and a front-rear direction length L2 of 50 to 100 mm. If the width direction interval D1 is too narrow, it is difficult to maintain the bulge of the crotch portion M, and if it is too wide, the bulge in the crotch portion M becomes too large, resulting in a feeling of wearing. The first easy-bend portion 3y preferably has an angle θ1 with respect to the front-rear direction within a range of ± 30 degrees, more preferably within a range of ± 10 degrees, particularly 0 degrees as shown in the figure. Is preferred. Moreover, the 1st easy bending part 3y can also be made into the curved shape where the front-back direction intermediate part swells to the width direction center side so that it may follow a leg periphery other than linear form like the example of illustration. Moreover, it is also preferable that the leading edge 4f of the barrier sheet 4 is positioned on or near the first easy-bending portion 3y in the unfolded state shown in FIG.

The second easy-bending portion 3x is provided in the range where the angle θ2 with respect to the width direction is −60 degrees to +60 degrees (the state along the width direction is 0 degrees as shown). This angle range is preferably ± 45 degrees, more preferably 0 to +60 degrees (+ is an oblique front side), and particularly preferably 0 to +45 degrees. Further, the second easy-bending portion 3x has a linear shape as in the illustrated example, and also has a curved shape in which the middle portion in the front-rear direction bulges to the front side of the pad and to the center side in the width direction along the flange portion, for example. You can also.
Here, the easily bendable portions 3y and 3x of the present invention can be formed by a compression processing portion such as a slit or embossing, and the width is preferably about 5 to 20 mm. The slit is easier to bend.

Further, as shown in FIG. 7, when the absorber 3 is configured by stacking the upper layer 3U upper layer on the lower layer 3B, a portion overlapping the lower surface of the upper layer 3U at the periphery of the lower layer 3B, or a lower layer at the periphery of the upper layer 3U The easy-bending portions 3y and 3x of the present invention can be configured by the portion overlapping the upper surface of 3B. In this case, the fiber basis weight of the layer to be bent is about 150 to 420 g / m ² and the thickness is about 4 to 8 mm. The fiber basis weight of the layer that is not bent is about 230 to 300 g / m ² and the thickness is about 4 to 8 mm. Is preferred. The example shown in FIG. 7 shows the case where the first and second easily bent portions 3y and 3x similar to the example shown in FIGS. 1 to 3 are formed by a layer structure, and the lower layer 3B includes the second The front edge 3f has a shape along the easy-bending portion 3x, and the first easy-bending portion 3y is formed by a slit or a compression processing portion. The upper layer 3U extends to the front side and the rear side from the lower layer 3B. It is something that has been put out. The upper layer 3U is provided with a later-described diffusion preventing unit 3z.

In a more preferred form, as shown in the figure, a slit or embossing that continues from the side edge on one side in the width direction of the absorbent body 3 to the side edge on the other side behind the first easily bent portion 3y in the crotch portion M. A diffusion preventing portion 3z composed of a compression processing portion by processing or the like is formed. When the diffusion preventing unit 3z is provided as described above, the osmotic diffusion of urine absorbed at the front side is blocked or blocked by the diffusion preventing unit 3z. Therefore, since the diffusion of urine to the back side is prevented, the pressure ulcer prevention effect is further enhanced.
The width of the diffusion preventing part 3z is preferably about 5 to 20 mm. Further, as the diffusion preventing unit 3z, a slit is preferable because it has a higher effect of blocking urine diffusion.

  The diffusion preventing portion 3z is preferably provided within a range of the crotch portion M in a range from the rear end of the first easily bent portion 3y to a position of 10 mm on the front side and a position of 30 mm on the rear side. In order to further improve the diffusion preventing performance, a plurality of them can be provided at intervals in the front-rear direction as shown in FIG. Further, the shape of the diffusion preventing part 3z can be determined as appropriate, and can also be a straight line along the width direction as shown in FIG. 6, but the intermediate part in the width direction bulges forward as shown in FIG. Shape is preferred. As such a bulging shape, a chevron that is bent at the center in the width direction as shown in the drawing is preferable to a curved shape, and inflection points are used to make the shape gradually along the width direction as shown in the drawing. It is preferable to provide it. When the diffusion preventing part 3z has such a bulging shape, the urine that permeates and diffuses toward the rear side changes its direction obliquely along the diffusion preventing part 3z, making it difficult to exceed the diffusion preventing part 3z. .

Furthermore, in order to prevent the spread of urine to the back side and further enhance the pressure ulcer prevention effect, the absorbent body 3 is structured not to extend to the back side portion B as shown in FIG.
In the absorbent pad thus configured, the first easy-bend portion 3y is mountain-folded when viewed from the body side (inner surface side), and the second easy-bend portion 3x is valley-folded when viewed from the body side (inner surface side). Thus, as shown in FIG. 8, the central portion in the width direction of the crotch portion M bulges toward the body with respect to the left and right sides, and the bulging portion is elastically supported with respect to the crotch between the left and right sides It adheres and withstands the weight after urine absorption so that the adhesion is maintained, and the body is located relative to the crotch M at the portion where the ventral portion F is located in front of the second easy-bend portion 3x. Standing to the side, it fits well to the lower abdomen, and it is difficult to apply unnecessary force to the abdomen, so a situation occurs where a gap occurs in the crotch due to the displacement of the abdomen F It becomes difficult. Further, in the illustrated form, the rear end of the absorbent body 3 is located at the boundary between the crotch M and the back part B, so that the back part B also stands on the body side with respect to the crotch M, and the body buttock It fits well.
Even if the absorber 3 does not extend to the dorsal portion B, it is actually difficult to completely prevent urine from spreading to the dorsal side in all cases. As a countermeasure against the diffusion, a body pressure dispersion layer 33 described later is provided between the top sheet 1 and the back sheet 2 in the back portion B.

(First form of body pressure dispersion layer)
As shown in FIGS. 9 to 12, the first form of the body pressure dispersion layer is formed by laminating a plurality of moving layers 33A and 33B in which an absorbent polymer 31 is dispersed in a sheet-like fiber base 30. It is. These can be integrally coated with a coating sheet (not shown) as required. The material of the covering sheet is not particularly limited as long as it has a property of permeating body fluid. For example, the same material as exemplified as the liquid-permeable top sheet 1 can be used.

The total weight of the absorbent polymer 31 in the body pressure dispersion layer 33 is 250 to 500 g / m ² , preferably 300 to 400 g / m ² , and particularly preferably 330 to 340 g / m ² . If the total weight of the absorbent polymer 31 is less than 250 g / m ² , the liquid absorption function may be insufficient, and if it exceeds 500 g / m ² , the weight may be excessive and the cost may increase. . If the weight of the absorbent polymer 31 in each of the moving layers 33A and 33B is two layers, the weight of one of the moving layers may be increased in addition to the half of the absorbent body. For example, the basis weight of the moving layer 33B on the side close to the back surface layer can be increased.

  As is clear from FIGS. 9 and 11, the body pressure dispersion layer 33 is formed by gelation expansion due to liquid absorption of the absorbent polymer 31 so that the absorbent polymer 31 passes through the gaps between the fibers of the sheet-like fiber base material. The moving layers 33A and 33B that swell up to one surface of the sheet-like fiber base material and form a polymer layer on the base fiber are those in which the absorbent polymer swell surface F faces. A polymer having a necessary and sufficient thickness between the moving layers 33A and 33B, particularly as schematically shown in FIG. 10, when the gelled polymer swells from the laminated moving layers 33A and 33B to the facing side. A layer 40 is formed, and body pressure is received and dispersed by the gelled polymer layer 40.

The compression work of a suitable absorbent body after polymer swelling is 1.0 to 11.5 gf · cm / cm ² . If it is less than 1.0 gf · cm / cm ² , the body pressure dispersibility may not be sufficiently exhibited. If it exceeds 11.5 gf · cm / cm ² , it is not desirable from the viewpoint of maintaining the shape of the body pressure dispersion layer 33. There is a case.
In addition, the measuring method of the compression work amount of the body pressure dispersion layer 33 is as follows. First, an absorbent body cut to 30 mm × 30 mm is used as a sample, and this is put into a beaker of 50 mmΦ, and then physiological saline is added to swell for 10 minutes. At this time, the physiological saline is used in an amount of 40 g or more per 1 g of the polymer. Thereafter, the sample is taken out of the beaker and placed on a horizontal table. At this time, the polymer layer should not be crushed. Next, the compression work is measured by compressing the center of the absorbent body with a compression tester. The measurement condition is a compression with a weight of 50 g (speed 0.1 cm / sec) with a disk having an area of 2 cm ² . For example, Kato Tech Co., Ltd. KES-G5 may be used as the compression tester.

  Further, since the gelled polymer layer 40 is formed to bulge on the sheet-like fiber substrate surface 30 (F), it is hardly subjected to restraint by the sheet-like fiber substrate 30. Therefore, the moving layers 33A and 33B facing each other are not restricted from moving in the shearing direction due to the presence of the gelled polymer layer 40, and the moving layers can move in the shearing direction.

By these effects, the remarkable body pressure dispersion effect and the pressure ulcer prevention effect which were not made by the conventional absorbent article can be obtained.
In addition, since the number of moving layers is easy to manufacture and can be easily adjusted to an appropriate thickness, it is preferably two layers as shown in the drawing, but is not necessarily limited to two layers.
Moreover, the thickness of the gelled polymer layer 40 after liquid absorption is not limited, but is preferably about 5 to 20 mm.

Here, the moving layer desirably has a polymer swelling amount ratio of 10 to 60% by weight after swelling. Preferably, it is 35 to 45% by weight. If it is less than 10% by weight, the body pressure dispersibility may be insufficient, and if it exceeds 60% by weight, the displacement between the moving layers becomes too large, which may be undesirable from the viewpoint of maintaining the shape of the body pressure dispersion layer. .
In addition, the measuring method of the polymer swelling amount rate in this invention is as follows. First, a moving layer cut to 30 mm × 30 mm is used as a sample, and this is placed in a beaker having an inner diameter of 50 mmΦ, and then physiological saline is added to swell for 10 minutes. At this time, the physiological saline is used in an amount of 40 g or more per 1 g of the polymer. Thereafter, the sample is taken out of the beaker and placed on a horizontal table so that the polymer bulge surface is on the upper side, and the weight is measured. At this time, the bulging polymer on the polymer bulging surface is prevented from being crushed. Next, the polymer layer on the polymer swelling surface is scraped 10 times with a spatula so as not to crush the polymer swelling surface, the weight of the sample after scraping is measured, and the polymer swelling amount rate is calculated according to the following equation 1.
[Formula 1] Polymer bulge rate = (sample weight after swollen polymer swell / sample weight after swell for 10 minutes) × 100

  On the other hand, in order to form the gelled polymer layer 40 on the sheet-like fiber base material by gelling expansion due to liquid absorption, for example, as shown in FIG. 11, toward the absorbent polymer bulging surface F side. The absorbent polymer 31 is distributed unevenly in the sheet-like fiber base material 30 so that the absorbent polymer 31 is unevenly distributed so that the weight per unit area increases, and in particular, it is necessary and sufficient for swelling near the absorbent polymer bulging surface F. A sufficient amount of absorbent polymer 31 is positioned.

Moreover, you may make it the polymer types located toward the opposite surface side from the absorbent polymer bulging surface F side differ. For example, an absorbent polymer with high absorption, high expansion, high particle size, etc. is positioned on the absorbent polymer bulging surface F side, and an absorbent polymer with low absorption, low expansion, low particle size, etc., on the opposite surface side. Position.
The amount of absorbent polymer 31 necessary and sufficient for swelling is appropriately determined in consideration of the density of the sheet-like fiber substrate 30, the gap between fibers, the expansion coefficient of the absorbent polymer 31 to be used, and the like.

  If the example of the method of unevenly distributing an absorptive polymer in the thickness direction in the sheet-like fiber base material 30 is given, a large amount of adhesive is spread on one side of the sheet-like fiber base material 30, and the one-surface side absorbs. A method in which a large amount of the polymer 31 is adhered or a method in which the polymer 31 is unevenly distributed by a suction action can be employed. The moving layers 33A and 33B themselves may be formed by overlapping layers having different polymer weights.

If the absorbent polymer species listed below or an absorbent polymer used in a general absorbent article of this type is used, a low basis weight layer in which the basis weight of the absorbent polymer is 0 to 200 g / m ² , It is preferable to have a structure in which a high basis weight layer having a basis weight of 150 to 400 g / m ² located on the side of the absorbent polymer bulging surface with respect to the basis weight layer is laminated. Further, as in the example of the body pressure dispersion layer shown in FIG. 11, the basis weight of the absorbent polymer is substantially 0 g on the side opposite to the polymer bulging surface rather than the low basis weight layer so as to easily bulge to the desired surface F. It is preferable to provide a non-weighted layer that is / m ² . In this case, the fiber density of the non-weighted layer is preferably higher than that of the other two layers.

Further, the adhesive force between the fibers of the sheet-like fiber base 30 and the absorbent polymer 40 is reduced or adhered so that the gelled polymer layer 40 is suitably formed on the sheet-like base fiber base 30. It is more effective to make the part smaller.
In this way, the absorbent polymer 31 easily loses its adhesiveness to the fiber due to swelling due to liquid absorption from the state in which it is adhered to the fiber, and only the portion other than the minimal adhesion region that is adhered to the fiber swells. Thus, it is easy to separate from the fibers while leaving the minimal region, and thus the gelled polymer layer 40 is suitably formed by bulging from the gap between the fibers to a desired surface.

Further, when the gelled polymer layer 40 is formed on the sheet-like base fiber 30, for example, the absorbent polymer bulging surface F of the moving layers 33A and 33B like the body pressure dispersion layer shown in FIG. It is preferable that the material has been subjected to embossing e processing.
When embossing is performed, the area of the bulging surface becomes large and the amount of polymer exposed increases, so that the bulging from the inside of the base material to the desired surface is facilitated.

Further, for example, after embossing the sheet-like fiber base material 30, the absorbent polymer 31 can be scattered in the sheet-like fiber base material 30 only by spraying the absorbent polymer 31 on the embossed surface. There is also an advantage that the moving layer of this embodiment can be easily manufactured.
Here, the emboss pattern is not particularly limited. The embossing pattern and embossing method conventionally used for this kind of body pressure dispersion layer or moving layer can be adopted.

In fixing the absorbent polymer 31 to the fibers of the sheet-like fiber base material 30, it is preferable to bond them with a hot melt adhesive. The hot melt adhesive is excellent in handling properties and can adhere the absorbent polymer 31 in a state where the binding force is weak against the fiber, so that the absorbent polymer can surely swell to the fiber substrate surface during liquid absorption. Can be scattered.
These hot melt adhesives include styrenic block copolymers, polyurethane block copolymers, polyester block copolymers, polyamide block copolymers, copolymer blend base polymers, rosin resins, and polyterpenes. Solid resins at room temperature such as epoxy resins, terpene phenol resins, dicyclopentadiene petroleum resins, aliphatic petroleum resins, aromatic petroleum resins, copolymer petroleum resins, alicyclic petroleum resins, xylene resins and elastomers Those containing at least an adhesiveness imparting component, a plasticizer component such as waxes, and an antioxidant as constituent components are preferably used.

Here, the sticking rate of the polymer to the sheet-like fiber base material in the moving layer is desirably 45 to 95%. 80 to 95% is particularly desirable. If it is less than 45%, a jerky feeling tends to occur, and a desired polymer layer is hardly formed. Moreover, even if it exceeds 95%, it becomes difficult to form a desired polymer layer.
In addition, the measuring method of the adhesion rate of the polymer in this invention is as follows. First, the moving layer cut or molded to 270 mm × 70 mm is used as a sample, and the weight of the sample is measured. Then, it is put in a 280 mm × 200 mm resin bag without breaking the shape and sealed. Then, the bag is subjected to 50 vibrations at an amplitude of 100 mm at a rate of 1 time / second to drop the absorbent polymer from the fiber substrate. Next, the weight of the dropped absorbent polymer is measured, and the sticking rate of the absorbent polymer is calculated according to the following formula 2.
[Formula 2] Adhesion rate of absorbent polymer = 100%-{(dropped polymer weight / initial weight of sample) × 100}

On the other hand, the sheet-like fiber base material 30 constituting the moving layers 33A and 33B is made of a nonwoven fabric sheet, a tow fiber aggregate, a synthetic fiber aggregate, a piled fiber pulp, or the like.
Air-laid non-woven sheet formed by toe fiber aggregate, synthetic fiber aggregate and air laid method has strong entanglement between fibers, excellent shape stability, and does not fray between fibers when broken in the shear direction. Easy to use as a moving layer.
Synthetic fiber aggregate fibers include nylon, polyethylene terephthalate, polyethylene, polypropylene, and other general synthetic fibers such as olefin, polyester, and polyamide, as well as those obtained by cutting resinous film sheets into fibers. Can be used.

On the other hand, when making a sheet-like fiber base material into a nonwoven fabric sheet, the density is good to set it as 0.01-0.25 g / cm < ³ >. When the density of the fiber base material is within the range of the present invention, it is possible to suitably perform the scattering of the absorbent polymer and the swelling of the absorbent polymer 31 through the gaps between the fibers.
In addition, the nonwoven fabric sheet preferably includes short fibers, and particularly includes short fibers that are hydrophilic crimped fibers.

Specific examples of non-woven sheets include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, natural fibers such as cotton, airlaid, spunlace, and spunbond. Examples thereof include those processed by an appropriate processing method such as a method, a point bond method, a thermal bond method, a melt blown method, and a needle punch method.
The air-through nonwoven fabric is preferable because it is bulky and can increase the porosity, easily disperse a sufficient amount of the absorbent polymer, and quickly form a polymer layer on the surface of the fiber substrate. In particular, an air-through nonwoven fabric composed of a mixed fiber of polyethylene / polypropylene is suitable.
In view of body pressure dispersibility, dispersibility of the absorbent polymer, formability of the polymer layer, and the like, a sheet-like fiber substrate made of a particularly suitable nonwoven fabric sheet has a short fiber diameter of 2 to 20 dtex and a fiber length of 20 to 70 mm. It is an air-through nonwoven fabric sheet having a basis weight of 20 to 50 g / m ² and a thickness of 0.4 to 10 mm, including fibers.

  On the other hand, when a piled pulp is used as the sheet-like fiber base material 30, the raw material is not particularly limited. For example, known materials such as cotton-like pulp and synthetic pulp can be exemplified. Moreover, the raw material fiber of a pulp is not specifically limited, For example, the cellulose fiber obtained from woods, such as a mechanical pulp, a chemical pulp, and a dissolving pulp, Artificial cellulose fibers, such as rayon and an acetate, etc. can be illustrated. However, wood, which is a raw material for cellulose fibers, is preferable in terms of functions and cost, such as a void-forming surface, because conifers have a longer fiber length than hardwoods.

  On the other hand, as for the absorptive polymer 31 scattered in the sheet-like fiber base material 30, it is desirable that the liquid absorption measured based on the tea bag method is 40-100 g / g. When the liquid absorption amount of the absorbent polymer 31 exceeds 100 g / g, the gelled polymer layer 40 becomes too thick, and the possibility that the wearing feeling deteriorates increases. Moreover, the shift | offset | difference in the boundary between moving layer 33A, 33B becomes easy to produce excessively, and the possibility of a deterioration of a fit feeling increases. On the other hand, if the degree of swelling is less than 40 g / g, the sufficient gelled polymer layer 40 is not formed, and the possibility that the desired body pressure dispersion effect cannot be obtained increases.

Here, the measurement procedure of the tea bag method is measured according to the following procedures (1) to (6).
(1) A measurement sample is prepared by putting 0.5 g of an absorbent polymer in a tea bag (made of 200 mesh nylon bag).
(2) Put 100 cc of physiological saline in a 200 cc beaker and immerse the sample in the physiological saline for 30 minutes.
(3) Pull up the sample from the physiological saline and drain it for 5 minutes. Draining is done by suspending the raised tea bag above the beaker. The draining is performed at a room temperature of 15 to 30 ° C. and a humidity of 40 to 80%.
(4) Measure the weight of the sample after draining.
(5) For an empty tea bag without an absorbent polymer, the weight after draining is measured according to the procedures (1) to (4).
(6) Calculate the amount of physiological saline absorbed per gram of the absorbent polymer by the formula: ([weight after draining the sample] − [weight of tea bag after draining]) / 0.5, and absorb this Amount.

The absorbent polymer preferably has a gel strength after swelling of 0 to 10 mm. If the gel strength of the absorbent polymer exceeds 10 mm, the polymer layer may be completely crushed by body pressure and the desired body pressure dispersion effect may not be obtained.
Here, the gel strength was measured by placing 2 g of an absorbent polymer as a measurement sample in a 200 cc beaker with an opening diameter of 67Φ, and then adding 60 cc of physiological saline to allow the polymer to absorb for 3 minutes. Gently place a 500 g sphere on the expanded surface of the absorbent polymer absorbed in the solution and leave it for 3 minutes. Next, the sunk length of the sphere is measured and used as the gel strength. The sinking length is the distance from the expansion surface to the lowest part of the sphere.

Further, the absorbent polymer desirably has a viscosity after swelling of 200 to 1500 mpa · s. If it is less than 200 mpa · s, the moving layer may not preferably move in the shearing direction, and if it exceeds 1500 mpa · s, the body may not be sufficiently supported by excessive movement.
In addition, the measuring method of a viscosity is as follows. First, a 1 g sample polymer having an inner diameter of 50 mmΦ is added, and 40 g of physiological saline is further added and left for 10 minutes to swell the absorbent polymer. Next, the probe of the viscosity measuring device is inserted into the swelling polymer and vibrated for 10 minutes, and the magnitude of the internal resistance per unit area acting in the vertical direction at this time is measured. As the viscosity measuring device, for example, VM-10A manufactured by CBC Corporation may be used.

  Specifically, the absorbent polymer 31 includes carboxymethyl cellulose, polyacrylic acid and salts thereof, crosslinked acrylate polymer, starch-acrylic acid graft copolymer, starch-acrylonitrile graft copolymer hydrolyzate, It can be selected from cross-linked polyoxyethylene, cross-linked carboxymethyl cellulose, polyethylene oxide, polyacrylamide, and other partially crosslinked polymers, or a copolymer of isobutylene and maleic acid. What added the blocking inhibitor in order to suppress the blocking property by moisture absorption of a product can also be used. Absorbent polymers include various forms such as powders, particles, granules, pellets, sols, suspensions, gels, films, and non-wovens. Can also be used in the present invention, and particulates are particularly preferably used. It may be a granulated product or a crushed product.

In addition, although the average particle diameter (by the sieving method) of an absorptive polymer can be suitably determined in consideration of the density of the fiber base material, etc., a suitable example is 150 to 500 μm. A particularly suitable example is 200 to 400 μm. When the thickness is less than 150 μm, the polymer fixing rate is deteriorated, and when the thickness exceeds 500 μm, it is difficult to be scattered in the sheet-like fiber base material.
On the other hand, in one preferred embodiment, as shown in FIG. 9 in particular, sheet-like diffusion members 50 and 50 made of a nonwoven fabric sheet are provided on both the front surface side and the back surface side of the body pressure dispersion layer 33. If the sheet-like diffusion member 50 is provided on the front surface side, it may be the front surface side or the back surface side of the covering sheet.

  In the illustrated example, the sheet-like diffusion members 50 and 50 are provided on both the front and back surfaces of the body pressure dispersion layer, but may be provided on only one of them. The sheet-like diffusion member is preferably formed of an air-through nonwoven fabric sheet. By providing such a sheet-like diffusing member, body fluid such as urine and blood diffuses quickly over the entire body pressure dispersion layer, so that the entire moving layer is effectively used. In particular, when a non-woven sheet, particularly an air-through non-woven sheet, is interposed between the body pressure dispersion layer and the liquid-permeable top sheet, the degree of freedom of movement in the thickness direction of the body pressure dispersion layer is increased, and body pressure dispersion is reduced. It becomes easier to obtain. Moreover, the body fluid from the body pressure dispersion layer is prevented from returning, and the distance between the skin and the body pressure dispersion layer is increased, and the feeling of wear after liquid absorption is improved.

  Furthermore, in this embodiment, a pulp layer 60 in which the piled pulp is formed into a sheet is provided on the back side of the body pressure dispersion layer 33 and further on the back side of the sheet-like diffusion member 50 on the back side. ing. By disposing the pulp layer 60, the body fluid absorption rate is increased, the body fluid absorption capacity is increased, and the occurrence of unintended body fluid leakage is reduced. As the pile fiber, the pile fiber shown as being used for the above-mentioned sheet-like fiber base material can be used.

  In addition, a so-called second sheet, which is a so-called second sheet, can be disposed between the body pressure dispersion layer 33 and the liquid-permeable top sheet 1 to diffuse and permeate body fluid. The material of the second sheet is sufficient as long as it exhibits this body fluid diffusion / permeability. For example, the same material as the liquid permeable top sheet 1 can be exemplified, but the second sheet is a liquid permeable top. Those having superior body fluid permeability than the sheet are particularly preferred, and nonwoven fabrics having a fiber density smaller than that of the liquid permeable top sheet 1 are particularly preferred.

Here, in the illustrated example, the thickness and size of the moving layer 33A on the skin contact surface side (liquid permeable top sheet 1 side) and the moving layer 33B on the non-skin contact surface side (back sheet 2 side) are large. Are the same, but they need not be the same. For example, the moving layer 33A on the skin contact surface side (liquid permeable top sheet 1 side) in the front view may be configured to be smaller than the moving layer 33B on the non-skin contact surface side (back sheet 2 side). You may take the opposite structure. Considering the shape of the body pressure dispersion layer that fits the skin, each can have an appropriate size and shape. As the shape, the shape of the body pressure dispersion layer or the moving layer employed in this type of absorbent article can be appropriately employed.
Furthermore, the moving layers 33A and 33B may be different in thickness, type of absorbent polymer used, type and density of the fibrous sheet base used. Different configurations can be employed within the scope of the configuration of the moving layer of the present invention described above.

(Second form of body pressure dispersion layer)
As shown in FIG. 13, the 2nd form of a body pressure dispersion | distribution layer is a form which interposed the sheet | seat S which consists of a pile fiber pulp or a nonwoven fabric between adjacent moving layers. About the structure except that the sheet S which consists of pile fiber pulp and a nonwoven fabric is interposed, it is the structure similar to the said 1st Embodiment.
In accordance with this embodiment, by interposing the piled pulp and nonwoven fabric sheet between the moving layers, it becomes possible to adjust the rigidity of the body pressure dispersion layer, as well as the action of diffusion of body fluid between the moving layers, retention of body fluid between the moving layers, etc. Will occur.

Further, when a sheet S made of piled pulp or nonwoven fabric is interposed between the moving layers, when the polymer layer is formed, the swelling polymer constituting the polymer layer acts to adhere to the sheet S, and the polymer Is prevented from returning to the inside of the fiber base material, the disappearance and thinning of the polymer layer once formed are prevented, and the movement effect of the moving layer and the persistence of the body pressure dispersion effect are improved.
If the sheet S is a non-woven sheet having the same constitution as the so-called second sheet and having excellent body fluid diffusibility, the body fluid is diffused between the moving layers, and the body fluid is widely spread over the moving layer located on the skin non-contact surface side. Since it is moved while being diffused, there is an effect that the polymer layer forming portion in the moving layer located on the skin non-contact surface side is not unevenly distributed.

If the sheet S is a sheet having excellent body fluid retention properties such as piled pulp, the body fluid retention effect between the moving layers is increased, and the effect that the time during which the polymer layer is suitably formed between the adjacent moving layers is ensured. Play.
Here, the sheet S can use the same fiber material as the sheet-like fiber base material of the moving layer. However, it is preferable that the thickness is made thinner by the fibrous sheet base material and the density is made smaller. It is preferred that the absorbent polymer is not intrinsic. A specific thickness of the sheet S is suitably about 0.5 to 1.0 mm. The size is preferably substantially the same as or slightly smaller than the moving layer.

(Third form of body pressure dispersion layer)
As shown in FIGS. 14 to 17, the third form of the body pressure dispersion layer is a form in which a movement assisting layer that assists movement in the relative shearing direction between adjacent moving layers is provided. The configuration other than the moving layer and the movement assisting layer is the same as that of the first embodiment.
A cross-sectional view characteristically showing the third embodiment is shown in FIG. As shown in FIG. 14, the third embodiment has two moving layers 33A and 33B, and a movement assisting layer 70 is provided between the moving layers 33A and 33B. The number of moving layers is not limited to two, and three or more moving layers can be stacked.

The moving layers 33 </ b> A and 33 </ b> B in the present embodiment have a structure in which an absorbent polymer is dispersed in a fiber base similar to that in the first embodiment.
As the fiber base material 30 in this embodiment, the nonwoven fabric sheet, the tow fiber aggregate, the synthetic fiber aggregate, the piled fiber pulp, etc. shown in the column of the first embodiment can be used.
In the case of using an absorbent polymer, the method of dispersing in the fiber substrate, the fixing method, and the amount of polymer used can be the same as in the first embodiment.

  On the other hand, the movement auxiliary layer 70 will be described in detail. This layer is a layer that reduces at least one of the static friction coefficient and the dynamic friction coefficient between the movement layers when the polymer layer is formed. Preferably, it assists the movement in the shear direction between the moving layers even when the polymer layer is not formed. The force corresponding to the friction coefficient here is necessary when the upper moving layer is moved by pulling the upper moving layer with a constant force in the shearing direction in a state where the moving layers are stacked one above the other based on the horizontal method in JIS P 8147. The power to become.

The movement auxiliary layer 70 is formed by interposing a movement auxiliary material 71 mainly composed of gas, liquid, particles or a mixture thereof between the movement layers. From the viewpoint of body fluid retention and shape stability, the movement auxiliary layer 71 is a particle or particle. It is most suitable to mix an appropriate amount of liquid.
Specific materials suitable as the movement assisting material 71 include, for example, air, polymer particles, gels, bead particles, granular urethane materials, sponges, sponges, lubricating polymers, porous silicon sheets, silicon resins, silicon particles, and the like. It is done.

Although the thickness of the movement auxiliary layer 70 is not limited, it is preferably about 5 to 20 mm. The average particle diameter in the case of using particles as a material takes into consideration the fiber density of the fiber substrate 30 and the like. And design as appropriate. The particle density of the movement auxiliary layer is also appropriately designed in the same manner.
Here, the movement auxiliary layer 70 can take the following configuration in order to prevent unintentional outflow of the movement auxiliary material 71 from between the movement layers 33A and 33B and to keep it between the movement layers 33A and 33B. . That is, as shown in FIG. 15, the painting wall 72 is bridged between adjacent moving layers 33A and 33B and divided into a plurality of compartments 73, and movement assistance is provided to the compartments 73 and 73 thus separated. A structure filled with the material 71 can be obtained. The drawing wall 72 can be composed of a sheet of the same material as that used for the liquid-permeable top sheet described above, and can be bonded to the moving layers 33A and 33B with a hot melt adhesive or the like. The moving layers 33A and 33B may not necessarily be bonded to each other, or may be bonded to only one moving layer, for example, 3A. By adopting such a structure, the movement assisting material 71 is prevented from flowing out, and the displacement of the moving layers 33A and 33B in the excessive shearing direction is prevented.

  On the other hand, embossing e1 and e1 for integrating adjacent moving layers can be performed as shown in FIG. 16 in order to prevent unintended deviation between the moving layers 33A and 33B. The embossing process temporarily increases the adhesion between the layers 3A, 3B, 70, and the moving layer when the intended pressure is not applied to the skin contact surface or non-contact surface of the body pressure dispersion layer, such as when not in use. Is prevented from shifting. That is, as long as a desired body pressure is not applied, a product in which the displacement of the moving layer does not occur can be obtained. In order to obtain this effect, the body pressure dispersion layer may be embossed. This embossing works suitably also in the first embodiment.

  It should be noted that the moving layer in this embodiment also has the thickness and size of the moving layer 33A on the skin contact surface side (liquid permeable top sheet 1 side) and the moving layer 33B on the non-skin contact surface side (back sheet 2 side). It doesn't have to be the same. Each moving layer 33A, 33B may be different in configuration such as the type of absorbent polymer used, the type of fiber base used, and the density. Different configurations can be employed within the scope of the configuration of the moving layer of the present invention described above.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for an absorbent article used for a site to which body pressure is applied, such as a pants-type paper diaper, a stationary paper diaper, and an absorbent pad.

It is a top view of the absorption pad of a deployment state. It is AA sectional drawing of FIG. It is CC sectional drawing of FIG. It is a top view of an absorber. It is a top view of another absorber. It is a top view of other absorbers. It is a top view of the absorber of a two-layer structure. It is a photograph of an absorption pad. It is sectional drawing of the 1st form of a body pressure dispersion layer. It is the schematic which shows the cross section at the time of polymer layer formation of the body pressure dispersion layer in a 1st form. It is the schematic which supports the cross section of another example of a 1st form. It is the schematic which supports the cross section of the other example of a 1st form. It is sectional drawing of the 2nd form of a body pressure dispersion | distribution layer. It is sectional drawing of the 3rd form of a body pressure dispersion | distribution layer. It is the schematic which shows the other example of the 3rd form. It is the schematic which shows another example of a 3rd form.

  DESCRIPTION OF SYMBOLS 1 ... Liquid-permeable top sheet, 1B ... Standing cuff, 2 ... Liquid-impermeable back sheet, 3 ... Absorber, 3y ... 1st easy bending part, 3x ... 2nd easy bending part, 6 ... Fastening tape , 7 ... locking part, 30 ... sheet-like fiber base material, 31 ... absorbent polymer, 33 ... body pressure dispersion layer, 33A, 33B ... moving layer, 40 ... gelled polymer layer, 50 ... sheet-like diffusion member, 60 DESCRIPTION OF SYMBOLS ... Pulp layer, 70 ... Movement auxiliary layer, 71 ... Movement auxiliary material, 72 ... Drawing wall, 73 ... Section, e ... Embossing, F ... Absorbing polymer swelling surface.

Claims (6)

In an absorbent article in which an absorbent body composed of a fiber assembly is interposed between a liquid-permeable top sheet and an impermeable back sheet,
A crotch portion including a portion that is Ategawa the crotch has a ventral portion extending on the front side of the crotch portion, and a back side portion extending on the rear side of the crotch portion, and crotch portion and ventral portion thereof The absorber is provided so as to extend, and the absorber does not extend to the back side part,
On the left and right sides of the widthwise central portion of the crotch portion in the absorbent body, a first easy-bend portion extends linearly from the boundary with the ventral portion to the rear side of the article, respectively.
From the front end of the left first easy-bending part in the absorbent body to the left edge in the width direction, and from the front end of the right first easy-bending part in the absorber to the right edge in the width direction, respectively in the width direction The second easy-bend portion extends linearly within an angular range of ± 60 degrees ,
A moving layer in which an absorbent polymer is dispersed in a sheet-like fiber base material is laminated on the back side portion,
The moving layer is formed such that the absorbent polymer swells to reach one surface of the fiber base material through a void between fibers by gelation expansion due to liquid absorption to form a polymer layer on the fiber base material. Is composed of
The absorbent polymer bulging surfaces in adjacent moving layers are located facing each other, and are configured such that at least the formation of the polymer layer allows the adjacent moving layers to move in the shear direction between the layers .
An absorbent article characterized by the above.   The absorbent article according to claim 1, wherein the left and right first easy-bend portions have a widthwise interval of 60 to 200 mm and a longitudinal length of 50 to 300 mm.   The slit or the compression process part which continues from the side edge of the width direction one side of the absorber to the side edge of the other side is formed in the crotch part behind the 1st easy bending part. The absorbent article according to 1 or 2. The ventral part of the absorbent body has a longitudinal length of 100 to 450 mm, a width of 150 to 400 mm, and an area of 15,000 to 180,000 mm ² .
The absorbent article according to claim 3, wherein the crotch portion of the absorbent body has a length in the front-rear direction of 150 to 500 mm, a width of 150 to 400 mm, and an area of 22,500 to 200,000 mm ² .   The absorptive article according to any one of claims 1 to 4 in which at least one of said 1st easy bending part and the 2nd easy bending part is a slit or a compression processing part.   The absorber is formed by laminating an upper layer on a lower layer, and at least one of the first easy-folding portion and the second easy-folding portion overlaps the lower surface of the upper layer at the periphery of the lower layer or the upper layer. The absorbent article of any one of Claims 1-5 which is a part which overlaps with the upper surface of the lower layer in a periphery.

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