JP4536024B2 - Absorbent articles - Google Patents

Description

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

  Patent Document 1 discloses an absorbent article in which a three-dimensional sheet in which a first fiber layer is raised to form a large number of convex portions by contracting the second fiber layer is disposed between the top sheet and the absorbent body. Is described. In the absorbent article described in Patent Document 1, a portion corresponding to the three-dimensional sheet in the surface sheet is raised toward the wearer's skin side, and is excellent in fit to the wearer's skin.

JP 2004-154249 A

  However, in the absorbent article described in Patent Document 1, the means (capillary gradient) for transmitting body fluid to the absorber is too complex, and it is difficult to control body fluid transmission. The reason for this is that the factors related to the control of body fluid transmission are the capillary force of the top sheet, the capillary force of the first fiber layer, the capillary force of the second fiber layer, the capillary force of the absorber, the first fiber layer and the second fiber This is because there are many such as the capillary force at the joint with the layer and the change of these capillary forces under pressure.

  Moreover, in the absorbent article of patent document 1, the convex part of a solid sheet is formed by shrinking | contracting a 2nd fiber layer. At this time, if the first fiber layer and the second fiber layer are entirely bonded, the convex shape formed by the shrinkage becomes discrete (the strain relaxation cannot be controlled), and the cushioning properties and body There will be variations in fit. Therefore, it is considered desirable that the first fiber layer and the second fiber layer are partially bonded with a certain regularity. Therefore, the liquid is not sufficiently transferred between the first fiber layer and the second fiber layer, and the liquid remains in the first fiber layer, that is, on the skin side.

Moreover, the technique described in Patent Document 1 is a technique for improving fit to the body by utilizing the horizontal elastic contractility of the contracted second fiber layer. Therefore, in order to take advantage of the elastic shrinkage, the adhesion to the absorbent body that does not have stretchability has to be partially, by the liquid residue to the second fiber layer that has shrunk and densified, Smooth liquid transfer to the absorber is not possible.
Thus, in the absorbent article described in Patent Document 1, it is difficult to achieve both cushioning properties and absorptivity.

  Accordingly, an object of the present invention is to provide an absorbent article that is excellent in fit to the wearer's skin, can easily control body fluid transmission, and can easily absorb body fluid in the absorbent body.

  The present invention is an absorbent article comprising a top sheet, a back sheet, and an absorbent body interposed therebetween, the absorbent body comprising a long fiber web, and the web is highly absorbent. The absorbent polymer is embedded and supported, and the absorbent body is provided with an absorbent article in which a continuous convex layer composed of a large number of convex portions is formed on the surface sheet side. Achieved.

  According to the absorbent article of this invention, it is excellent in the fit property to a wearer's skin, control of body fluid transmission is easy, and body fluid is easy to be absorbed into an absorber smoothly.

  Hereinafter, the absorbent article of this invention is demonstrated based on the preferable embodiment. The absorbent article of the present invention is mainly used for absorbing and holding excretory body fluids such as urine and menstrual blood. The absorbent article of the present invention includes disposable diapers, sanitary napkins, incontinence pads, etc., but is not limited thereto, and widely includes articles used for absorbing liquid discharged from the human body. .

The absorbent article of the present invention typically includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorbent disposed between both sheets. As the top sheet and the back sheet, materials usually used in the technical field can be used without particular limitation. For example, as the surface sheet, various nonwoven fabrics or apertured films that have been subjected to a hydrophilic treatment can be used. As the back sheet, a thermoplastic resin film or a laminate of the film and a nonwoven fabric can be used. The back sheet may have water vapor permeability.
The absorbent article may further include various members depending on the specific application. For example, when applying an absorbent article to a disposable diaper or a sanitary napkin, a pair or two or more pairs of three-dimensional guards can be disposed on the left and right sides of the topsheet.

The absorbent article of the present invention will be described more specifically with reference to the drawings based on the disposable diaper according to the first embodiment.
A disposable diaper 1 as a first embodiment of the absorbent article of the present invention is a so-called tape-type diaper as shown in FIG. 1, and as shown in FIG. The absorbent body 4 and the liquid-impermeable back sheet 3 are laminated in this order. At the peripheral edge of the absorber 4, the top sheet 2 and the back sheet 3 are joined. The top sheet 2 and the back sheet 3 are recessed inward in the width direction at the longitudinal center (this edge is referred to as “concave edge 1E”), and have an hourglass shape as a whole in the unfolded state. .

The top sheet 2 and the back sheet 3 are joined to each other by a known joining means at the longitudinal end of the portion located on the abdominal side and the longitudinal end of the portion located on the back side, A waist flap portion 1C is formed. Further, side flap portions 1D are formed on both side edge portions of the portion located on the ventral side portion and both side edge portions of the portion located on the back side portion.
A waist elastic member G1 is stretched on the waist flap portion 1C, and a leg elastic member G2 is stretched along the concave edge portion 1E. A fastening tape G3 is provided on the side flap portion 1D on the back side.

Next, the absorber 4 which is a characteristic part of the absorbent article of the present invention will be described in detail.
The absorber 4 has a substantially vertically long shape along the longitudinal direction of the absorbent article in plan view. The shape of the absorbent body 4 in plan view may be, for example, a shape recessed inward in the width direction at the center in the longitudinal direction along the shape of the concave edge 1E, and the ventral side and / or the back side may be wide. It may be T-shaped or I-shaped extending to the peripheral edge in the direction.
As shown in FIG. 2, the absorbent body 4 is composed of a web of long fibers 52, and a superabsorbent polymer 53 is embedded and supported in the web. In the absorbent body 4, a continuous convex layer 6 in which a large number of convex portions 61 are continuously formed is formed on the surface sheet 2 side. The back sheet 3 side of the absorbent body 4 is a core layer 5 in which the density of the superabsorbent polymer 53 is higher than that of the continuous convex layer 6.

Each long fiber 52 extends substantially in one direction when the absorbent body 4 is viewed in plan (hereinafter, this direction is also referred to as the X direction of the absorbent body 4), and is oriented in the X direction of the absorbent body 4. . The absorbent body 4 is formed by dispersing a large number of long fibers 52 in a predetermined width.
This X direction is also the machine direction when the absorber 4 is manufactured. It is preferable that the X direction of the absorber 4 is along the longitudinal direction of the disposable diaper (absorbent article) 1 from the viewpoint of improving the touch and leakproofness.

  The orientation of the long fiber is sufficient if the vector connecting the start point and end point of the long fiber is oriented in the plane direction, and part of the long fiber is in the vertical direction due to twisting or entanglement between the start point and the end point. Including those that face (the thickness direction of the absorber). More specifically, the degree of orientation of the long fibers is preferably 1.2 or more, particularly 1.4 or more in terms of the degree of orientation. In this embodiment, the degree of orientation is measured using a Microwave molecular orientation analyzer MOA-2001A manufactured by KANZAKI. The sample size is 100 mm in the longitudinal direction and 50 mm in width, and the average value of three points is the degree of orientation. When the sample size is less than this size, measurement is performed by arranging a plurality of samples so as not to overlap each other.

The density of the superabsorbent polymer 53 in the continuous convex layer 6 is preferably 80% or less, more preferably 50% or less with respect to the density of the superabsorbent polymer 53 in the core layer 5. When the ratio of the density of the superabsorbent polymer 53 is within this range, even if the liquid is absorbed, the convex portion 61 is not filled with the swollen superabsorbent polymer 53, so that gel blocking does not occur and repeated absorption is achieved. Maintains rapid liquid permeability even when done. In addition, when the whole shape can change like the inside of the absorptive core 5, gel blocking can be prevented by using the superabsorbent polymer 53 with high gel strength. However, when the concavo-convex structure is fixed as in the absorbent article of the present invention, even when the superabsorbent polymer 53 having a high gel strength is used, if the superabsorbent polymer 53 is blended at a high concentration, gel blocking is caused. There is a concern that the absorption performance may be reduced.
Further, there is an advantage that the compression characteristic of the convex portion 61 is not governed by the compression characteristic of the gel (there is a gel feeling) and the liquid is retained on the skin surface so that the dry feeling is not lost.

Thus, since it is necessary for the absorber in the present invention to prevent gel blocking, it is preferable to use a superabsorbent polymer having the following characteristics. That is, by increasing the absorption capacity of the superabsorbent polymer, it is necessary to reduce the required amount of the superabsorbent polymer as much as possible and to use a superabsorbent polymer with high gel strength.
First, from the viewpoint of the amount of superabsorbent polymer used and the gel feeling after liquid absorption is prevented from decreasing, the amount of physiological saline absorbed by centrifugal dehydration is 30 g / g or more, particularly 30 to 30 g / g. It is preferable that it is 50 g / g. The water absorption amount of the superabsorbent polymer by centrifugal dehydration is measured as follows. That is, 1 g of superabsorbent polymer was swollen with 150 ml of physiological saline for 30 minutes, then placed in a 250 mesh nylon mesh bag, dehydrated with a centrifuge at 143 G (800 rpm) for 10 minutes, and the total weight after dehydration was determined. taking measurement. Next, the amount of water absorption (g / g) by centrifugal dehydration is calculated according to the following formula.
Water absorption by centrifugal dehydration method = (Total weight after dehydration-Weight of nylon mesh bag-Weight of superabsorbent polymer at drying-Weight of remaining liquid in nylon mesh bag) / Weight of superabsorbent polymer at drying

Furthermore, the superabsorbent polymer used in the above-described embodiment prevents the occurrence of gel blocking and the resulting decrease in absorption performance, and also prevents leakage due to the lack of liquid due to inadequate absorption. From the point, it is preferable that the liquid passage time measured by the following method is 20 seconds or less, particularly 2 to 15 seconds, particularly 4 to 10 seconds. The measurement of the liquid transit time is as follows. That is, 0.5 g of the superabsorbent polymer was placed in a cylindrical tube having a cross-sectional area of 4.91 cm ² (inner diameter: 25 mmφ) and an openable / closable cock (inner diameter: 4 mmφ). Fill with water and swell the superabsorbent polymer with the saline until it reaches saturation. After the swollen superabsorbent polymer settles, the cock is opened and 50 ml of physiological saline is allowed to pass through. The time required for 50 ml of the physiological saline to pass through is measured, and this time is taken as the liquid passage time. The liquid transit time is one of the indices that reflect the gel strength of the superabsorbent polymer. The shorter the liquid passage time, the stronger the gel strength.

Furthermore, it is more preferable to use a superabsorbent polymer having a high liquid passing rate under load. As the superabsorbent polymer, a polymer having a liquid flow rate of 30 to 300 ml / min, preferably 32 to 200 ml / min, more preferably 35 to 100 ml / min is used.
When the value of the liquid flow rate is less than 30 ml / min, the superabsorbent polymers saturated and swollen by the liquid absorption adhere to each other under load, thereby preventing the passage of the liquid, and gel blocking is likely to occur. The larger the value of the liquid flow rate, the better from the viewpoint of preventing the occurrence of gel blocking.

  When the liquid flow rate exceeds 300 ml / min, the fluidity of the liquid in the absorber is too high, especially when a large amount of excreta is excreted at once, or in the case of older infants or adults. As described above, when the excretion rate is fast, when the absorber is further thinned, the liquid is not sufficiently retained, and there is a possibility of leakage. In general, increasing the liquid flow rate increases the degree of crosslinking of the superabsorbent polymer, lowering the absorption capacity per unit weight of the superabsorbent polymer, and a large amount of superabsorbent polymer must be used. I must. From these viewpoints, the upper limit value of the flow rate is determined.

  The measurement of the flow rate of the superabsorbent polymer 21 is performed under a 2.0 kPa load. This load substantially corresponds to the body pressure applied to the absorbent body while wearing the absorbent article. A specific method for measuring the flow rate is described in paragraph [0005] of Japanese Patent Laid-Open No. 2003-235889, for example. In the present invention, the measurement is performed by changing 0.200 g, which is the weight of the sample used in the measurement method described in this publication, to 0.32 g. Specifically, the flow rate is measured by the following procedure.

[Measurement method of flow rate]
A filtration cylindrical tube provided with a wire mesh (aperture 150 μm) and a thin tube (inner diameter 4 mm, length 8 cm) with a cock (inner diameter 2 mm) at the lower end of a vertically standing cylinder (inner diameter 25.4 mm). prepare. With the cock closed, 0.32 g of a measurement sample adjusted to a particle size of 850 to 150 μm is put into the cylindrical tube. Next, 50 ml of 0.9% by weight physiological saline is poured into the cylindrical tube. After standing for 30 minutes from the start of pouring physiological saline, a cylindrical rod (21.2 g) having a mesh opening of 150 μm and a diameter of 25 mm and having a wire mesh at the tip is inserted into the filtration cylindrical tube. Make the measurement sample touch. After 1 minute, a 77.0 g weight is attached to the cylindrical rod and a load is applied to the measurement sample. After another 1 minute, open the cock. The time (T1) (second) until the liquid level of the physiological saline solution reaches the 20 ml scale line from the 40 ml scale line is measured. Using the measured time T1 (seconds), the liquid passing time is calculated from the following equation. In the formula, T0 is a time measured without putting a measurement sample in the filtering cylindrical tube.
Flow rate (ml / min) = 20 × 60 / (T1-T0)

  A more detailed method for measuring the flow rate is described in paragraphs [0008] and [0009] of JP-A No. 2003-235889. The measuring device is described in FIGS. 1 and 2 of the publication.

  The superabsorbent polymer that can be used in the above-described embodiment is not particularly limited as long as it satisfies each of the above-described characteristics. Specifically, for example, polyacrylic acid soda, (acrylic acid-vinyl alcohol) copolymer Examples thereof include a polymer, a crosslinked sodium polyacrylate, a (starch-acrylic acid) graft polymer, a (isobutylene-maleic anhydride) copolymer and a saponified product thereof, potassium polyacrylate, and cesium polyacrylate. In order to satisfy the above-described characteristics, for example, the crosslink density inside and on the surface of the superabsorbent polymer may be adjusted, or a crosslink density gradient may be provided on the particle surface. Alternatively, the superabsorbent polymer particles may be non-spherical amorphous particles. In particular, by adopting a reverse phase suspension polymerization method using an anionic surfactant described in Japanese Patent No. 2721658 relating to the earlier application of the present applicant as a dispersant, it has a desired liquid flow rate. A superabsorbent polymer is obtained. Alternatively, the method described in JP-A-7-18495, column 7 line 28 to column 9 line 6 can be used.

  The density of the superabsorbent polymer 53 is defined by the area ratio of the superabsorbent polymer 53 occupying in the cut section of the absorber. Specifically, a sample in a state where a weight of 24.5 kPa was applied in advance for 12 hours to remove the influence of thickness recovery, wrinkles, and the like was prepared. The sample was cut out with a cutter from the top of the convex portion as a base point, and an image for a width of 50 mm was captured as an enlarged image of 25 times (the entire image could not be captured at once, so the video was divided). The obtained image was processed using image analysis processing software (Image-Pro plus, Media Cybernetics), and the area occupied by the superabsorbent polymer 53 was calculated. Assuming that the particle shape of the superabsorbent polymer 53 is spherical, the area percent concentration obtained is raised to 3/2 and the weight percent concentration in this cross section is calculated. The measurement was an average of 5 points.

The structure of the absorbent body 4 is, for example, that a single layer web is embossed to press the entire lower side of the web and partially press the upper side of the web (the manufacturing shown in FIG. 4 described later). It can be formed by partially joining the web forming the continuous convex layer on the web forming the core layer (see the manufacturing method shown in FIG. 11 described later).
In order to distribute the superabsorbent polymer 53 in the core layer at a high concentration, when the absorber is formed from a single layer web, a method of spraying the superabsorbent polymer 53 from the back sheet side (core layer), or Further, there is a method of wrapping the superabsorbent polymer 53 by spreading the superabsorbent polymer 53 in the center in the width direction on the web and bending the non-sprayed area.

  When the absorbent body is formed from a plurality of webs, a method of spraying different amounts of the superabsorbent polymer on the core layer and the continuous convex layer, a method of spraying the superabsorbent polymer only on the core layer, and / or Or the method of changing the crimp rate of the long fiber of a core layer and a continuous convex part layer, a fiber diameter, a fiber amount, a density, etc. is mentioned. When the absorbent body is formed from a plurality of webs, the core layer portion may be wrapped with paper or non-woven fabric such as tissue paper, or the paper or non-woven fabric such as tissue paper may be sandwiched between the core layer and the continuous convex layer. . The same paper or nonwoven fabric as the lower layer coating sheet 41 described later can be used.

  The long fibers forming the absorbent core preferably include hydrophilic long fibers, and the hydrophilic long fibers are 50% by weight or more, more preferably 70% by weight or more, and most preferably 80% by weight. It is preferable that it is contained above. The long fibers 52 having hydrophilicity are inherently hydrophilic long fibers, and are not inherently hydrophilic, but have been given hydrophilicity by being subjected to a hydrophilic treatment. Both are included. Preferred long fibers are inherently hydrophilic long fibers, and particularly preferred are acetate and rayon long fibers. In particular, acetate is particularly preferable because it retains bulkiness even when wet.

Moreover, it is preferable to use what is crimped as a long fiber. The long fiber has a crimp rate (JIS L0208) of preferably 10 to 90%, more preferably 10 to 60%, and still more preferably 10 to 50%. By forming a web from crimped long fibers, it becomes easy to stably and highly embed a superabsorbent polymer in the web. There is no particular limitation on the means for crimping the long fibers. The crimp may be two-dimensional or three-dimensional. The crimp rate is defined as a percentage of the difference between the length when the long fiber is stretched and the length of the original long fiber to the length when stretched, and is calculated from the following equation.
Crimp rate = (A−B) / A × 100 (%)

  The length of the original long fiber means a length in which both ends of the long fiber are connected with a straight line when the long fiber is in a natural state. The natural state means a state in which one end of the long fiber is fixed to a horizontal plate and hung downward by its own weight. The length when the long fiber is stretched refers to the length at the minimum load when the long fiber is stretched until there is no crimp.

  There is no restriction | limiting in particular in the fiber diameter of a long fiber. In general, by using a long fiber of 1 to 10 dtex, particularly 1.7 to 7.8 dtex, resistance to the absorber and cushioning properties are imparted, and satisfactory results are obtained. In the present invention, the long fiber means a fiber having a fiber length of preferably 70 mm or more, more preferably 80 mm or more, and even more preferably 100 mm or more when the fiber length is measured by the average fiber length measurement method (Method C) of JIS L1015. Say. However, when the total length of the web to be measured is less than 100 mm, preferably 50% or more, more preferably 70% or more, more preferably 80% or more of the fibers in the web extend over the entire length of the web. Sometimes the fibers of the web are long fibers. The long fibers used in the present invention are generally called continuous filaments. A bundle of continuous filaments oriented in one direction is generally called a tow. Therefore, the long fiber in the present invention is a concept including a continuous filament. The web in which long fibers are oriented is a concept including a tow layer of continuous filaments. In addition, a part of the long fiber may be cut, and a fiber having a fiber length lower than the above value (cut fiber) may be mixed in the absorbent body.

  As shown in FIG. 2, a superabsorbent polymer 53 is embedded and supported in the absorber 4. “Superabsorbing the superabsorbent polymer” means that the superabsorbent polymer enters the space formed by the long fibers constituting the absorber, and the extreme absorbency of the superabsorbent polymer is increased even by the violent movement of the wearer. A state in which movement or dropout is difficult to occur. At this time, the long fibers are entangled or caught in the superabsorbent polymer, or the superabsorbent polymer is attached to the long fiber due to its own stickiness.

  As the superabsorbent polymer, a particulate polymer is generally used, but a fibrous polymer may be used. When a particulate superabsorbent polymer is used, if the shape is an irregular type, a block type, or a bowl type, it can be embedded and supported at a basis weight of the same amount to 10 times the web. it can. Further, in the case of a spherical particle aggregation type or a spherical type, it can be embedded and supported with a basis weight of the same amount or more and 5 times or less with respect to the web. For these particle shapes, it is desirable to select the former when it is particularly desired to achieve both high absorption and thinning, and the latter when importance is placed on the texture (reduction of the feeling of shaving of the superabsorbent polymer).

As shown in FIG. 2, the superabsorbent polymer 53 is uniformly embedded and supported on the core layer 5 in the first embodiment.
“The superabsorbent polymer is uniformly embedded and supported” means that the superabsorbent polymer is completely evenly disposed in the thickness direction or the width direction of the absorber, and a part of the absorber. When it is taken out, it means a case where the variation in the amount of the superabsorbent polymer has a distribution within twice the basis weight. Such a variation is caused by rarely supplying a superabsorbent polymer excessively and producing a part with an extremely high spraying amount in manufacturing the absorbent article. That is, the term “uniformly” includes cases where inevitably variations occur, and does not include cases where the superabsorbent polymer is distributed so as to intentionally vary.

The distribution in the thickness direction of the superabsorbent polymer 53 in the absorbent body 4 can be changed. For example, the superabsorbent polymer 53 may be embedded and supported while being biased with respect to the thickness direction of the web of the long fibers 52. Specifically, in the absorbent body 4 shown in FIG. 3A, the superabsorbent polymer 53 is embedded and supported in a biased manner on the skin-facing surface side of the web. On the other hand, in the absorbent body 4 shown in FIG. 3 (b), the superabsorbent polymer 53 is biased and carried on the non-facing surface side of the web in the web. In the absorbent body 4 shown in FIGS. 3 (a) and 3 (b), the abundance of the superabsorbent polymer 53 may change continuously in the thickness direction of the web, or changes stepwise. May be.
The absorbent body 4 shown in FIG. 3A is suitable as an incontinence pad for light incontinence or an absorbent body of a sanitary napkin because of its high spot absorptivity. The absorbent body 4 shown in FIG. 3 (b) is suitable as an absorbent body for disposable diapers because of its high liquid diffusibility and high liquid absorbability throughout the absorbent body.

  Further, the absorbent body can be formed by stacking a web in which a superabsorbent polymer is embedded and loaded on or under a fluff pulp layer that does not contain the superabsorbent polymer or contains the superabsorbent polymer. Yes (not shown). In this absorber, the fluff pulp layer that does not contain the superabsorbent polymer or contains the superabsorbent polymer acts as a primary stock layer of the excreted liquid, so that the excretion rate of the liquid is high (for example, urine is excreted) Even if it is), liquid leakage can be effectively prevented. From this viewpoint, it is preferable that the superabsorbent polymer embedded and supported in the web is biased and embedded in the web on the non-facing surface side. However, it is also possible to spray the superabsorbent polymer uniformly or biased toward the non-skin contact surface. Such an absorber is suitable as an absorber of a disposable diaper.

  Various changes can be made as the state of dispersion of the superabsorbent polymer in the absorbent body in the planar direction. In addition to the state in which the superabsorbent polymer is uniformly dispersed in the plane direction as described above, a state in which the superabsorbent polymer is dispersed so as to be biased toward the front side of the absorbent body is exemplified. That is, there is a state in which the spreading basis weight is the same in the width direction of the absorber and the spreading basis weight is higher toward the front side of the absorber. The absorber in which the superabsorbent polymer is dispersed so as to be biased toward the front side of the absorber has a high effect of preventing liquid leakage from the front side of the body. Such an absorbent body is particularly useful as an absorbent body of a pants-type disposable diaper.

  In another embodiment, a state in which the superabsorbent polymer is dispersed so as to be biased toward the rear side of the absorber, more specifically, a U-shape opened toward the front side of the absorber. Examples include a state where a superabsorbent polymer is dispersed. The absorber in which the superabsorbent polymer is dispersed so as to be biased toward the rear side of the absorber has a high effect of preventing liquid leakage from the rear side of the body. Such an absorbent body is particularly useful as an absorbent body for disposable diapers for low-age infants and bedridden people.

  As another embodiment, a state in which the superabsorbent polymer is not dispersed in the peripheral region of the absorbent body and the superabsorbent polymer is dispersed in the central region surrounded by the peripheral region can be mentioned. The absorber in such a state can effectively prevent the superabsorbent polymer from falling off the absorber because the superabsorbent polymer is not dispersed in the peripheral region of the absorber.

In addition to or instead of these superabsorbent polymer spraying states, the superabsorbent polymer spraying state can be changed in the width direction of the absorber. For example, the spreading basis weight of the superabsorbent polymer in the center part in the width direction of the absorbent body can be made higher than the spreading basis weight of the superabsorbent polymer in both side parts in the width direction. By doing in this way, the liquid leak from a wearer's leg periphery can be prevented effectively. Such an absorber is suitable as an absorber of a disposable diaper. On the other hand, the spreading basis weight of the superabsorbent polymer at both sides in the width direction of the absorber can be made higher than the spreading basis weight of the superabsorbent polymer at the center portion in the width direction. By doing in this way, the spot absorptivity of an absorber can be improved. Such an absorbent body is suitable as an absorbent body for incontinence pads for light incontinence and sanitary napkins. When changing the dispersion state of the superabsorbent polymer in the width direction of the absorbent body, it is preferable that at least the crotch part of the absorbent body has the above-described structure.
The dispersion state of these superabsorbent polymers can be implemented in combination as appropriate.

  In the first embodiment, the entire surface of the core layer 5 on the back sheet 3 side and both side edges on the top sheet 2 side are permeable lower layer covering sheets 41 as shown in FIGS. 2 (b) and 6 (b). It is covered with. Examples of the lower layer covering sheet 41 include tissue paper, spunbond nonwoven fabric, spunbond-meltblown-spunbond nonwoven fabric, spunbond-meltblown-meltblown-spunbond nonwoven fabric, needle punched nonwoven fabric, spunlace nonwoven fabric, dry pulp sheet, and air-through nonwoven fabric. Airlaid sheets or the like can be used. These non-woven fabrics can be made of a thermoplastic resin such as polyethylene, polypropylene, polyethylene terephthalate alone or using these composite fibers. Further, natural pulp such as wood pulp, semi-synthetic fibers such as rayon, cotton, and acetate may be mixed.

In the absorbent article of this invention, the continuous convex part layer 6 is formed in the surface sheet 2 side in the core layer 5. FIG. In the first embodiment, the continuous convex layer 6 is formed by embossing the top sheet 2 side of a single layer web.
That is, when the web of the long fiber 52 in which the superabsorbent polymer 53 is embedded and supported is embossed from the surface sheet 2 side, the density of the long fiber 52 is increased in the portion pressed by the embossing in the web. On the other hand, the density of the long fibers 52 hardly changes in the portion not pressed by the emboss. As a result, the portion not pressed by the embossing has a relatively low density of the long fibers 52 and a height from the surface on the back sheet 3 side of the absorbent body 4 as compared to the portion pressed by the embossing. Get higher. In this way, on the surface sheet 2 side of the absorbent body 4, a continuous convex layer 6 is formed in which a large number of convex portions 61 bulged so as to project toward the surface sheet 2 are continuous.

As shown in FIG. 2A, the convex portions 61 are formed in a zigzag shape in plan view in the X direction of the absorber 4 and the direction orthogonal to the X direction (hereinafter also referred to as the Y direction). In the first embodiment, the large number of convex portions 61 in series in the X direction and the Y direction of the absorber 4 are each at an equal pitch.
As another embodiment, the pitch of the convex portions 61 can be partially changed. By making the pitch fine, the convex portion 61 becomes fine, and the fit is improved with respect to a place where the body curvature is large, for example, a crotch part, a urine drainage part, a laceration part or the like. Moreover, since the flow of a liquid can be suppressed, a leak can be suppressed by arranging to the product longitudinal direction and the width direction edge part. These pitches may be used alone or in combination.

The convex part 61 of the continuous convex part layer 6 has a height h from the core layer 5 of 0.5 to 10 mm, preferably 0.8 to 5 mm. The height h of the convex portion 61 is the height of the apex from the valley portion.
For the measurement of the height h of the convex portion 61, the absorber 4 was preliminarily applied with a load of 24.5 kPa for 12 hours so that there was no wrinkle, and then the measurement location was cut in the thickness direction and left for 5 minutes. To do later. Specifically, a weight is placed on an acrylic plate having a size of 5 cm × 5 cm on the absorber, and the measurement is performed in a state in which a pressure adjusted to 0.245 kPa is placed on the sample. The measurement device used was a KEYENCE LK080 class 2 laser displacement meter. The number of measurement points was an average of 5 points, and when a measurement value of 20% or more was touched, the data was deleted and another sample was added.

The interval in plan view of adjacent convex portions 61 in the continuous convex layer 6 is preferably 0.5 to 10 mm, more preferably 2 to 7 mm in the longitudinal direction of the absorbent article. Moreover, the planar view space | interval of the convex part 61 becomes like this. Preferably it is 1-10 mm in an absorbent article width direction, More preferably, it is 2-7 mm. The planar view interval of the convex portion 61 is measured with the apex as a reference. The number of convex portions per unit area (1 cm ² ) is preferably 1 to 20, particularly 6 to 15.

  When the absorber 4 is made of a single layer web as in the first embodiment, the core layer 5 contains a large amount of the superabsorbent polymer 53, and the continuous convex layer 6 contains a small amount of the superabsorbent polymer 53. In order to make it contain or not contain, for example, a single layer web may be used in which the superabsorbent polymer 53 is biased and buried on the lower side (the back sheet 3 side).

  The inside of the convex part 61 in the continuous convex part layer 6 may be filled with the constituent fiber of the fiber assembly which forms the continuous convex part layer 6, or another fiber (not shown), FIG.2 (b). As shown in FIG. 4, the fibers may not be filled (that is, may be hollow).

The absorbent body 4 as a whole (that is, the whole of the core layer 5 and the continuous convex layer 6 as a whole) has a compression work (WC value) by a KES compression tester in the thickness direction of 0.98 cN · cm. / Cm ² or more, preferably 1.47 cN · cm / cm ² or more. When the compression work amount (WC value) is specified, there is no sense of incongruity due to the uneven structure of the absorber, excellent recovery after pressure release (for example, after removal from the pack), and cushioning properties. An absorbent article can be provided, and it has an advantage that it can be fitted to the body immediately after being taken out, can quickly absorb liquid, and can be made very compact by compression.

This compression modulus was measured using a Kato Tech KES-G5 handy compression tester. That is, a 5 cm × 10 cm test piece was prepared and attached to a test bench. The specimen was compressed between steel plates having a circular plane with an area of 2 cm ² . The compression speed was 20 μm / sec and the maximum compression load was 4.9 kPa. The recovery process was also measured at the same rate. The compression work WC is expressed by the following equation. T _m, T ₀ and P indicate respectively 4.9kPa (50gf / cm ²⁾ Thickness of time load, a load of 49Pa (0.5gf / cm ²⁾ when the thickness and measuring the time of loading.

  The vertex of the convex portion 61 is joined to the top sheet 2. The apex of the convex portion 61 and the surface sheet 2 are joined by, for example, hot melt or heat fusion. When such bonding is performed, the liquid is quickly absorbed from the convex portion, the liquid does not remain on the entire surface sheet, and the pressure is dispersed to reduce the liquid return, so that the skin remains dry. There is an advantage that can be.

  Next, the manufacturing method of the absorber 4 in the disposable diaper 1 of 1st Embodiment is demonstrated. As shown in FIG. 4, first, an elongated absorbent body material 4 serving as a material of the absorbent body 4 is formed on a lower layer coating sheet 41 on which an adhesive B1 such as a hot melt agent is applied in a predetermined pattern on the upper surface. 'Join. Here, the width of the lower layer covering sheet 41 is wider than the width of the absorbent body material 4 ′, and the absorbent body material 4 ′ is not bonded to both sides in the width direction of the lower layer covering sheet 41.

  Next, the absorbent body material 4 'is embossed with an embossing roll R1 and a smooth roll R2 each having an embossing R11 on the peripheral surface. The embossing R11 of the embossing roll R1 has a shape and an arrangement corresponding to the convex portions 61 of the continuous convex layer 6 as shown in FIG. By the embossing with the pair of embossing rolls R1 and smoothing rolls R2, the convex portions 61 are continuously formed in a predetermined arrangement on the upper side (surface sheet 2 side) of the absorbent body material 4 ′, and the continuous convex layer 6 is formed. .

  Next, as shown in FIG. 6, the width direction material side portion of the lower layer covering sheet 41 is folded back by a folding line 41A to cover both sides in the width direction on the upper surface of the absorbent body material 4 '. As a result, the absorber 4 in which the continuous convex layer 6 is formed on the core layer 5 is obtained. The absorbent body 4 in which the continuous convex layer 6 is formed on the core layer 5 is joined to the top sheet 2, the back sheet 3, the elastic member, and the predetermined shape in the next step (not shown). The disposable diaper 1 is obtained by cutting or the like.

  In the disposable diaper 1 of the first embodiment, the constituent fibers of the absorbent body 4 are made of a web of hydrophilic long fibers 52, and a superabsorbent polymer 53 is embedded and supported in the web. On the surface sheet 2 side, a continuous convex layer 6 in which a large number of convex portions 61 are continuously formed is formed. Therefore, the continuous convex layer 6 made of the long fibers 52 is a main factor for controlling body fluid transmission, and the continuous convex layer 6 is formed from a part of the absorbent body 4, and the core layer 5 and the continuous convex portion are formed. Layer 6 is integrated. As a result, while realizing excellent fit to the wearer's skin, body fluid transmission is easily controlled, and the body fluid is easily absorbed by the absorbent body 4. Moreover, the absorber 4 can have a moderate compression elastic modulus, ensuring the thinness.

  Further, the continuous convex layer 6 has a low density of the long fibers 52 and does not embed and support the superabsorbent polymer, and the core layer 5 has a high density of the long fibers 52 and embeds and supports the superabsorbent polymer 53. Therefore, the body fluid is first quickly absorbed and diffused by the continuous convex layer 6, and then a sufficient amount is retained in the core layer 5. Therefore, it is possible to achieve both rapid absorption of body fluid and retention of a sufficient amount of body fluid.

Next, the variation of the arrangement | sequence form of the continuous convex part layer 6 is illustrated concretely. Regarding the points that are not particularly described, since the description of the first embodiment is appropriately applied, the same components are denoted by the same reference numerals and the description thereof is omitted. Also in the absorbent article provided with the continuous convex part layers 6 having different arrangement forms, the same effects as those of the first embodiment are exhibited.
As shown in FIG. 7, the arrangement form of the continuous convex layer 6 may be an arrangement form in which the convex portions 61 adjacent to each other in the width direction and the longitudinal positions of the convex portions 61 are aligned (not shifted). it can. In such an arrangement, the liquid diffusibility is improved, and liquid return can be reduced. In addition, there is an advantage that a linear flexible shaft can be easily formed on the continuous convex layer 6 and the convex portion is not crushed by folding creases even when the absorbent article is folded.

As shown in FIG. 8, the continuous convex layer 6 is biased toward the ventral side or the back side, with the excretory part when the absorbent article is mounted as the center, in the entire longitudinal direction of the absorbent body 4. Can be provided. With such an arrangement, there is an advantage that the body fit and the absorbent article can be made thin. In the case of a tape-type disposable diaper, the entire product tends to be thick due to a fastening tape or the like when packaging the package, which is particularly beneficial.
As shown in FIG. 9, the continuous convex layer 6 can be provided only on both sides in the width direction when the width direction of the absorber 4 is divided into approximately three equal parts. Such an arrangement has an advantage that the continuous convex layer 6 functions as a leak-proof wall.

  Next, the absorber 4 in 2nd Embodiment is demonstrated. Regarding the points that are not particularly described in the second embodiment, the description of the first embodiment is applied as appropriate, and therefore the same components are denoted by the same reference numerals and the description thereof is omitted.

  In the absorbent article 1 of the second embodiment, as shown in FIG. 10, the absorbent body 4 is highly absorbed by the absorbent core 5 </ b> A composed of a web of long fibers 52 in which a superabsorbent polymer 53 is embedded and supported. The continuous convex structure 6 </ b> A made of a web of long fibers 52 in which the conductive polymer is not embedded and supported is partially joined. The continuous convex structure 6 </ b> A constitutes the continuous convex layer 6, and the absorbent core 5 </ b> A constitutes the core layer 5.

  Further, as shown in FIG. 10, the partial joint between the continuous convex structure 6A and the absorbent core 5A is configured by the continuous convex structure 6A being embedded in the absorbent core 5A. Specifically, the intermediate covering sheet 42 is interposed between the continuous convex structure 6A and the absorbent core 5A, and the continuous convex structure 6A is embedded in the absorbent core 5A. The long fibers 52 in 6A break through the intermediate covering sheet 42 and are entangled with the long fibers 52 in the absorbent core 5A. The lower side of the absorbent core 5A is covered with a lower layer covering sheet 41, and the upper side of the absorbent core 5A is covered with an intermediate covering sheet 42. The intermediate covering sheet 42 can be made of the same material as the lower layer covering sheet 41 described above.

The continuous convex structure 6A and the absorbent core 5A are intermittently joined in the X direction and the Y direction of the absorbent body 4, respectively, whereby the continuous convex structure 6A and the absorbent core 5A are joined. Are formed in a staggered pattern in plan view.
In the continuous convex structure 6A, a portion other than the joint portion 62, specifically, a portion between the joint portions 62 and 62 adjacent to each other in the X direction is spaced from the absorbent core 5A and stretched toward the surface sheet 2 side. It protrudes so as to protrude, and the protruding portion forms a convex portion 61 having a substantially inverted U-shaped cross section.

  Next, the manufacturing method of the absorber 4 in the disposable diaper 1 of 2nd Embodiment is demonstrated. As shown in FIG. 11, first, the material of the absorbent core 5 </ b> A on the lower layer coating sheet 41 in which the adhesive B <b> 1 such as a hot melt agent is applied in a predetermined pattern on the upper surface (the surface on the absorbent core 5 </ b> A side). The long core material 5A ′ is joined. Here, as shown in FIG. 12, the lower layer covering sheet 41 is wider than the core material 5 </ b> A ′, and the core material 5 </ b> A ′ is not bonded to both sides of the lower layer covering sheet 41 in the width direction.

Further, above the core material 5A ′, on the intermediate covering sheet 42 on which the adhesive B2 such as a hot melt agent is applied in a predetermined pattern on the lower surface, a long shape serving as a material of the continuous convex structure 6A. The continuous convex structure material 6A ′ is laminated. Here, as shown in FIG. 12, the width of the intermediate covering sheet 42 is wider than the width of the continuous convex structure material 6A ′, and the continuous convex structure material 6A ′ is provided on both sides in the width direction of the intermediate covering sheet 42. Is not arranged.
Next, the adhesive B1 on both sides in the width direction of the lower layer coating sheet 41 and the adhesive B2 on both sides in the width direction of the intermediate coating sheet 42 are joined, and the core material 5A ′ is bonded to the lower layer coating sheet 41 and the intermediate coating sheet 42. Cover with.

Subsequently, the laminated body of the continuous convex structure body material 6A ′ laminated on the intermediate covering sheet 42 and the core material 5A ′ joined to the lower layer covering sheet 41 is smoothed with an embossing roll R3 having an embossed surface. Emboss with roll R4. The embossing of the embossing roll R3 has a shape and arrangement corresponding to the convex portion 61 of the continuous convex layer 6.
By the embossing with the pair of embossing rolls R3 and smoothing rolls R4, the convex portions 61 are continuously formed in a predetermined arrangement on the continuous convex structure layer material 6A ′ to obtain a continuous convex structure 6A. Moreover, the trough part of 6 A of continuous convex structure breaks through the intermediate | middle coating sheet 42, and it becomes intertwined with the long fiber 52 of 5 A of absorbent cores, and the junction part 62 is formed.

  As a result, the absorber 4 in which the continuous convex layer 6 is formed on the core layer 5 is obtained. The absorbent body 4 in which the continuous convex layer 6 is formed on the core layer 5 is joined to the top sheet 2, the back sheet 3, the elastic member, and the predetermined shape in the next step (not shown). The disposable diaper 1 is obtained by cutting or the like.

  According to the disposable diaper 1 of the second embodiment, the difference in density of the superabsorbent polymer between the core layer and the continuous convex layer becomes clear, and thus the same effect as the disposable diaper 1 of the first embodiment is more prominent. In addition to the effects, the liquid is diffused by the intermediate covering sheet 42, so that the absorber can be used more effectively.

  Another method of manufacturing the absorbent body is to wrap the entire web carrying a superabsorbent polymer with a paper or non-woven fabric such as tissue paper, form the absorbent body, and then subject the entire absorbent body to uneven processing. Can be mentioned.

As mentioned above, although embodiment of the absorbent article of this invention was described, the absorbent article of this invention is not restrict | limited to embodiment mentioned above, Unless it deviates from the meaning of this invention, it can change suitably. .
The absorbent article of the present invention is not limited to a tape-type disposable diaper, and may be a pants-type disposable diaper. In addition to disposable diapers, it can also be applied to sanitary napkins, incontinence pads, and the like.
The formation method of a continuous convex part layer is not restrict | limited to the manufacturing method mentioned above.
Each configuration in the above-described various forms can be appropriately combined or omitted.

  Hereinafter, more specific examples (Examples 1 to 3) will be described.

[Example 1]
First, an acetate long fiber tow having crimps was prepared. The fiber diameter of this long fiber was 2.1 dtex, and the total fiber amount was 25,000 dtex. After opening the tow with an air opening device under extension, a web in which a large number of discs are assembled at predetermined intervals around the axis and the web is spread between the receiving rolls. Got. Thereafter, the width was adjusted to 100 mm, and the speed was reduced and transferred onto a vacuum conveyor, and the web tension on the vacuum conveyor was relaxed. By this operation, an appropriate long fiber-long fiber distance and web thickness for supporting the superabsorbent polymer in the long fiber web are developed. The crimp rate of the long fibers in the web was 30%, and the number of crimps per 1 cm was 15. A superabsorbent polymer was sprayed on the web to obtain a layer in which particles of the superabsorbent polymer were embedded and held in the spread web. The basis weight of the web was 26 g / m ² and the basis weight of the superabsorbent polymer was 260 g / m ² .

Next, a hot-melt patterned spunbond-meltblown-spunbond non-woven fabric (basis weight 16 g / g) coated with a pattern (a grid shape with a longitudinal direction of 5 mm and a width direction of 5 mm, coated only for the central web width). m ² ). These webs and spunbond-meltblown-spunbond nonwoven fabrics were turned upside down, and the portion corresponding to the web width was embossed with an embossing roll and a smooth roll to form a continuous convex layer. Finally, 5 g / m ^{2 of} hot melt was spirally applied to both ends of the spunbond-meltblown-spunbond nonwoven fabric, and both sides of the web were bent so as not to be applied to the continuous convex layer, thereby obtaining an absorbent body. The height of the convex portion from the absorbent core was 3 mm, and the interval in plan view of the convex portion was 5 mm in the longitudinal direction of the absorbent article and 5 mm in the width direction.

An air-through nonwoven fabric having a basis weight of 25 g / m ² was used as the surface sheet. The air-through nonwoven fabric is composed of a core-sheath type composite fiber (having a thickness of 2.1 dtex, surface-treated with a surfactant, and having liquid permeability) having a core made of polypropylene and a sheath made of linear low density polyethylene. Yes. A porous film having a basis weight of 20 g / m ² as a backsheet, used was composite by bonding a polypropylene spunbond nonwoven fabric having a basis weight of 20 g / m ² hot melt 1.5 g / m ^2. The porous film is obtained by uniformly molding 100 parts by weight of a linear low density polyethylene resin having a density of 0.925 g / cm ² with 150 parts by weight of calcium carbonate and 4 parts by weight of an ester compound as a third component. And then uniaxially stretched twice in the longitudinal direction. Other than that, according to the manufacturing method of a normal disposable diaper, the disposable diaper of the structure shown in FIG.1 and FIG.2 was obtained. The absorber was arranged so that the orientation direction of the web coincided with the longitudinal direction of the diaper.

[Example 2]
After obtaining a web in which a superabsorbent polymer was embedded and supported in the same manner as in Example 1, a hydrophilized spunbond-meltblown-spunbond nonwoven fabric (tsubo) with a hot coat of 5 g / m ^{2 applied} to the core layer side by a spray coater. A stack of 16 g / m ² ) was obtained. Another spread web was stacked on the obtained laminate, and thereafter, an absorbent body was obtained in the same manner as in Example 1.

Example 3
As in Example 1, a web opened to a width of 300 mm was obtained using an air opening device and a roll. In the long fibers in the web, the crimp rate was 26%, the number of crimps per 1 cm was 18, the fiber diameter was 2.1 dtex, and the total fiber amount was 34,000 dtex. On the vacuum conveyor, 260 g / m ² of the superabsorbent polymer was sprayed over the width of 100 mm in the center of the web, and then the non-sprayed area was folded to wrap the superabsorbent polymer. As a result, a structure in which the web overlapped on the superabsorbent polymer was obtained. The obtained web was wrapped with a hydrophilized spunbond-meltblown-spunbond nonwoven fabric (basis weight 16 g / m ² ) and embossed. Other than that was carried out similarly to Example 1, and obtained the absorber.

[Relationship between crimp rate of long fiber web and loading rate of superabsorbent polymer]
Next, the relationship between the crimp rate of the long fiber web and the loading rate of the superabsorbent polymer was examined by the following procedure. The fiber diameter of the long fiber was 2.1 dtex. This tow was conveyed under extension and opened using an air opening device to obtain an opening web. Next, the web was wound through a spread web between a roll in which a large number of disks were incorporated around the axis at predetermined intervals and a smooth receiving roll. Thereafter, the web was adjusted to a width of 100 mm, transferred to a vacuum conveyor in a state where the conveyance speed was reduced, and the web tension on the vacuum conveyor was relaxed to develop crimps. The tension of the web was controlled to prepare a web of acetate long fibers having various crimp rates. As a result, the space between the long fibers was widened to facilitate the entry of the superabsorbent polymer, and the web was thickened to improve the embedding supportability of the superabsorbent polymer. A superabsorbent polymer was sprayed on the web, and the superabsorbent polymer was buried and supported in the spread web. The basis weight of the web was 26 g / m ² . The spreading basis weight of the superabsorbent polymer was 260 g / m ² . As the superabsorbent polymer, a bulk type having an average particle size of 330 μm was used.

The absorber thus obtained was subjected to a structural stability (when dry) test described later. The weight of the superabsorbent polymer supported on the web after the test is divided by the weight of the superabsorbent polymer blended in the web before the test and multiplied by 100, and the obtained value is multiplied by the superabsorbent polymer. (Dropping) loading rate (%). The results are shown in Table 1.
[Structural stability (when dry) test]
The center part of the absorber produced to 100x200 mm was cut | disconnected, and the absorber of 100x100 mm was obtained. The cut surface was directly below, and vibration was applied 20 times at an amplitude of 5 cm at a rate of 1 time / second, and the amount of the polymer dropped from the cut surface was measured. Then, the weight of the superabsorbent polymer supported on the web after the test was calculated.

FIG. 1 is a perspective view showing a disposable diaper that is a first embodiment of the absorbent article of the present invention. Fig.2 (a) is a schematic diagram which emphasizes the continuous convex part layer in the absorber of the disposable diaper shown in FIG. 1, FIG.2 (b) is a BB cross section shown to Fig.2 (a). FIG. Fig.3 (a) and FIG.3 (b) are typical sectional drawings which show the absorber from which distribution of a superabsorbent polymer differs, respectively. FIG. 4 is a perspective view showing one manufacturing method of the absorbent body shown in FIG. FIG. 5 is a partially enlarged perspective view of a peripheral surface of an embossing roll used in the manufacturing method shown in FIG. 6 is a plan view showing one step of the manufacturing method shown in FIG. 4, (a) is a diagram showing a state before the cover sheet is folded, and (b) is a diagram showing a state after the cover sheet is folded. is there. FIG. 7 is a schematic development view (corresponding to FIG. 2A) showing another arrangement form of the convex portions in the continuous convex portion layer. FIG. 8 is a schematic development view (corresponding to FIG. 2A) showing another arrangement form of the continuous convex layer. FIG. 9 is a schematic development view (corresponding to FIG. 2A) showing another arrangement form of the continuous convex layer. FIG. 10 is a partial enlarged cross-sectional view (corresponding to FIG. 2B) showing the absorber in the second embodiment. FIG. 11 is a perspective view showing one manufacturing method of the absorbent body shown in FIG. FIG. 12 is a perspective view showing one step of the manufacturing method shown in FIG.

Explanation of symbols

1 Absorbent article (disposable diaper)
2 Top sheet 3 Back sheet 4 Absorbent body 41 Lower layer covering sheet 42 Intermediate covering sheet 5 Core layer 5A Absorbent core 52 Long fiber 53 Superabsorbent polymer 6 Continuous convex layer 6A Continuous convex structure 61 Convex part 62 Joint part

Claims (3)

An absorbent article comprising a top sheet, a back sheet, and an absorber interposed therebetween,
The absorbent body is composed of a long fiber web, and a superabsorbent polymer is embedded and supported in the web.
The absorbent body has a continuous convex layer formed of a large number of continuous convex portions on the surface sheet side ,
In the absorbent body, a continuous convex structure composed of a long-fiber web not embedded and supported with a superabsorbent polymer is partially joined to the absorbent core composed of the web embedded and supported with a superabsorbent polymer. And the continuous convex structure constitutes the continuous convex layer,
The partial joint between the continuous convex structure and the absorbent core is configured by the continuous convex structure being embedded in the absorbent core,
An intermediate covering sheet is interposed between the continuous convex structure and the absorbent core,
The continuous convex structure is embedded in the absorbent core by the long fibers in the continuous convex structure breaking through the intermediate covering sheet and being entangled with the long fibers in the absorbent core. absorbent articles are configured.   The back sheet side of the absorbent body is a core layer having a higher density of the superabsorbent polymer than the continuous convex layer, and the density of the superabsorbent polymer in the continuous convex layer is the core layer. The absorbent article according to claim 1, which is 80% or less of the density of the superabsorbent polymer in the layer. The absorptive article according to claim 1 or 2 with which said long fiber which is a constituent fiber of said continuous convex part layer is filled in said convex part .

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