JP2012143544A - Absorbent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a wear feeling while maintaining excellent body shape suitability of a conventional absorbent, and to improve liquid diffusibility and liquid absorbency.SOLUTION: The absorbent 10 includes: a liquid-receiving layer part 11 absorbing a liquid and diffusing it in the planar direction; and a plurality of protruding liquid absorption storage parts 12 separately disposed on one surface side of the liquid-receiving layer part 11 continuously to the liquid-receiving layer part 11, and absorbing and storing the liquid. The plurality of protruding liquid absorption storage parts 12 each have a higher area ratio than each recessed part 13 disposed between the protruding liquid absorption storage parts 12, and the liquid-receiving layer part 11 of the bottom part of the recessed part 13 has lower basis weight and density than the protruding liquid absorption storage part 12.

Description

  The present invention relates to an absorber.

  In absorbent articles, such as a disposable diaper, the material and structure of each member were improved and the function and the feeling of wear have been improved. The absorbent body applied to the absorbent article has also been developed with the aim of such improvement, and in recent years, various ones having functionality according to the use situation and the type of the article have been proposed.

  In Patent Document 1, an absorber made up of a large number of individual absorbent parts is arranged between the top sheet and the back sheet and in the plane direction, and an intermediate sheet is arranged between the absorber and the back sheet. An absorbent article is disclosed. This intermediate sheet has a function of drawing the liquid drained into the absorbent article and a function of diffusing the liquid, and fixes the absorbing portion through a fixing point. This fixing point is, for example, ultrasonic embossing or hot melt adhesive. Therefore, the absorber and the intermediate sheet have an interface between them and are not integrally molded.

  Patent Document 2 includes a tuft area that is a low-density area that is not substantially densified, and a channel that separates and surrounds the tuft area from each other, and the tuft area and the channel are continuous. An absorbent pad is disclosed. The channel includes a storage area and a transport area, the storage area having a density greater than the tuft area, and the transport area having a density greater than the storage area. The transport area is separated and surrounded by a storage area.

  In the absorbent article disclosed in Patent Document 1, the absorbent portion is arranged and fixed to the intermediate sheet via a fixed portion having a smaller area than the absorbent portion. Therefore, the absorbent article is attached to perform an operation such as walking. In such a case, the absorber may “sway” and the absorbent part may float, and in either case, there was a sense of incongruity. In addition, since the fixed portion is interposed between the intermediate sheet and the absorbent portion and has an interface, diffusion from the intermediate sheet to the absorber may be hindered by the fixed portion and the interface, and may be insufficient. The absorption performance of the absorber was not sufficiently drawn out. Further, in the absorbent pad disclosed in Patent Document 2, since the density of the tuft area is low and the density of the channel area is high, the diffusion of liquid from the channel area to the tuft area is insufficient.

JP 2009-273868 A Japanese Patent Laid-Open No. 01-045801

  This invention makes it a subject to improve a liquid diffusibility and a liquid absorptivity while improving a feeling of mounting, maintaining the outstanding body type compatibility which the conventional absorber has.

  The present invention includes a liquid-receiving layer part that absorbs liquid and diffuses in a plane direction, and a liquid receiving layer part that is continuously separated from the liquid-receiving layer part on one surface side of the liquid-receiving layer part and absorbs the liquid. A protruding liquid absorption storage part for storing, the protruding liquid absorption storage part having a higher area ratio than the recesses arranged between the protruding liquid absorption storage parts, and the liquid receiving layer part at the bottom of the concave part is the protruding liquid. Provided is an absorber having a lower basis weight and density than an absorbent storage.

  The absorber of the present invention diffuses the liquid supplied to the absorber mainly in the plane direction in the liquid receiving layer portion having a low density, and the high density protruding liquid that continues the diffused liquid in the liquid receiving layer portion. Since it can be absorbed and stored in the absorption storage section, the amount of liquid absorption increases, and the absorption performance can be improved. Further, when the absorbent body of the present invention is applied to an absorbent article such as a diaper, the upper surface side of the protruding liquid absorption storage part is kept on the skin contact surface while maintaining the advantage that the adhesion (fit feeling) to the skin can be improved. By arranging the liquid receiving layer portion side on the non-skin contact surface side, the feeling of stickiness to the skin can be reduced. Furthermore, since the protruding liquid absorption storage part is continuous with the liquid receiving layer part, it is reduced that the protruding liquid absorption storage part is lifted, and the protruding liquid absorption storage part is not lifted. Is eliminated and the feeling of wearing becomes better.

It is the longitudinal cross-sectional view which showed 1st Embodiment of preferable one Embodiment of the absorber of this invention. It is sectional drawing explaining the measuring method of the density of an absorber. It is (1) perspective view and (2) longitudinal cross-sectional view which showed the liquid supply of the liquid supplied to the absorber, and the diffusion state. It is the longitudinal cross-sectional view which showed the liquid penetration of the liquid supplied to the continuous absorber, and the diffusion state. It is the longitudinal cross-sectional view which showed 2nd Embodiment of preferable one Embodiment of the absorber of this invention. It is the longitudinal cross-sectional view which showed 3rd Embodiment of preferable one Embodiment of the absorber of this invention. It is the top view which showed 4th Embodiment of preferable one Embodiment of the absorber of this invention. It is schematic structure sectional drawing which showed an example of the absorptive main body using the absorber of this invention. It is the schematic block diagram which showed an example of the manufacturing apparatus preferably used for manufacture of the absorber of this invention. It is manufacturing process sectional drawing which showed an example of the preferable manufacturing method of an absorber. It is the perspective view which showed an example which changed the basic weight of the liquid receiving layer part of a recessed part bottom part. It is the top view which showed the example and comparative example which changed the basic weight of the liquid-receiving layer part of a recessed part bottom part. It is the plane expanded view which showed a preferable example of the absorbent article using the absorber of this invention. It is the perspective view which showed an example of the walking test apparatus.

  1st Embodiment of preferable one Embodiment of the absorber which concerns on this invention is described below, referring FIG.

  As shown in FIG. 1, the absorbent body 10 (10A) of the present invention includes a liquid receiving layer portion 11 that once receives a liquid, and a continuous surface of the liquid receiving layer portion 11 on one surface side of the liquid receiving layer portion 11. And it has the protrusion liquid absorption storage part 12 distributed separately in plurality. Accordingly, a recess 13 for diffusing a large amount of liquid in the planar direction is disposed between each protruding liquid absorption storage section 12 and another adjacent protruding liquid absorption storage section 12. The protruding liquid absorption storage part 12 and the recessed part 13 are arranged so that the area ratio of the plurality of protruding liquid absorption storing parts 12 is higher than the area ratio of the recessed part 13. The area ratio will be described in detail later. The plurality of protruding liquid absorption storage portions 12 mainly absorb and store the liquid diffused in the liquid receiving layer portion 11. Of course, the plurality of protruding liquid absorption storage parts 12 absorb and store the liquid from the part that directly contacts the liquid. Further, the density of the protruding liquid absorption storage section 12 is higher than the density of the liquid receiving layer section 11 below the protruding liquid absorption storage section 12. Therefore, the protruding liquid absorption storage part 12 absorbs liquid from the liquid receiving layer part 11 by capillary force.

The basis weight of the liquid receiving layer portion 11 is preferably 10 g / m ² or more and 300 g / m ² or less, more preferably 30 g / m ² or more and 200 g / m ² or less, and particularly preferably 40 g / m ² or more. 150 g / m ² or less.
Moreover, the basic weight of the said protrusion liquid absorption storage part 12 is higher than the basic weight of the liquid receiving layer part 11 in a recessed part as a total basic weight of the liquid receiving layer part 11 which is in contact with the protrusion liquid absorption storage part 12, It is preferable. Is 200 g / m ² or more and 800 g / m ² or less, more preferably 300 g / m ² or more and 700 g / m ² or less, and particularly preferably 400 g / m ² or more and 600 g / m ² or less. The basis weight of the protruding liquid absorption storage part 12 can be calculated from the difference in basis weight of the liquid receiving layer part 11 in the recess.
The basis weight of the protruding liquid absorption storage unit 12 is 100 g / m ² or more and 600 g / m ² or less, preferably 200 g / m ² or more and 600 g / m ² or less, more preferably 300 g / m ² or more and 600 g / m ^{2. 2} or less.

The density of the liquid receiving layer portion 11 is preferably 0.01 g / cm ³ or more and 0.09 g / cm ³ or less, more preferably 0.02 g / cm ³ or more and 0.07 g / cm ³ or less. If the basis weight of the liquid receiving layer portion 11 is too low, the diffusibility in the liquid receiving layer portion 11 is low, the liquid accumulates in the vicinity of the urination portion, the amount of liquid return increases, and the liquid easily leaks. If the basis weight of the part 11 is too high, the liquid will not easily move to the protruding liquid absorption storage part 12, and the liquid will easily return. On the other hand, if the density of the liquid receiving layer portion 11 is too low, the capillary force does not work sufficiently and the diffusibility in the liquid receiving layer portion is reduced, so that liquid accumulates in the vicinity of the urination portion, and the amount of liquid return increases or leaks. It becomes easy. On the other hand, if the density of the liquid receiving layer part 11 is too high, the voids in the liquid receiving layer part 11 are reduced, so that the amount of liquid to be diffused is reduced and the amount of liquid delivered to the protruding liquid absorption storage part 12 is reduced. And it becomes easy to leak.
Further, the density of the protruding liquid absorption storage part 12 is higher than the density of the liquid receiving layer part 11, preferably 0.03 g / cm ³ or more and 0.3 g / cm ³ or less, more preferably 0.05 g / cm. ³ or more and 0.2 g / cm ³ or less, particularly preferably 0.06 g / cm ³ or more and 0.15 g / cm ³ or less. When the density of the protruding liquid absorption storage unit 12 is too low, the capillary force is less likely to act and it is difficult to guide the liquid that has passed through the liquid receiving layer part 11 to the protruding liquid absorption storage part 12 and it is difficult to hold the liquid. . On the other hand, when the density of the protruding liquid absorption storage part 12 is too high, the superabsorbent polymer (SAP) is liable to cause swelling inhibition, and it is difficult to hold the liquid that has passed through the liquid receiving layer part 11. . Therefore, it is desirable that the density of the protruding liquid absorption storage unit 12 is higher than that of the liquid receiving layer unit 11 and set in the above range. In addition, the measuring method of basic weight and a density is mentioned later.

  The shape of the protruding liquid absorption storage part 12 is not particularly limited, and an arbitrary shape can be adopted. In the present embodiment, the liquid receiving layer portion 11 and the protruding liquid absorption storage portion 12 are composed of pulp fibers and a superabsorbent polymer (SAP), and the outline thereof is not regular as shown in the figure. It is preferable that the whole is a three-dimensional shape. Further, the vertical and horizontal arrangements of the protruding liquid absorption storage unit 12 are not limited, and are preferably determined as appropriate according to the application.

  The protruding liquid absorption storage part 12 has a rectangular or trapezoidal shape that is long in the width direction in the longitudinal section, and the area of the surface 12S on the skin contact surface side is the area of the back surface 12B on the non-skin contact surface side. Are the same or smaller.

  Since the absorbent body 10 of the present embodiment is composed of a group of a large number of separated protruding liquid absorption storage portions 12, the “body compatibility” that fits the undulations on the skin surface is a normal large-sized absorbent body (continuous Significantly higher than that of the absorber. In addition, the “tracking ability” that follows the wearer's movement satisfactorily and prevents a partial gap from occurring on the skin is extremely good. According to the present embodiment, it is possible to achieve both such good deformability and good absorption and retention of liquid and the like that are not affected by the deformation.

  Further, the absorber 10 repeats the excretion from the initial excretion, so that the liquid is spread to a wider range, for example, the entire area of the liquid receiving layer section 11 or an area close to the entire area by the diffusion action of the liquid receiving layer section 11. Spread. Then, the liquid can be absorbed from the liquid receiving layer portion 11 using the protruding liquid absorption storage portion 12 in the diffused region. Therefore, the amount of liquid absorbed by the absorber 10 is greatly improved.

On the other hand, the absorption amount of the conventional absorbent body (see Patent Document 1) in which the protruding liquid absorption storage unit is independently arranged is reduced by repeating the discharge from the first discharge. This is because the protruding liquid absorption storage parts 12 are separated from each other, so that the liquid does not easily move between the protruding liquid absorption storage parts 12, thereby reducing the liquid permeability, and in particular the liquid from the drainage part to other parts. This is probably because the transition may not be sufficient. As a result, the range of use stays in a narrow area around the drainage section and its surroundings, and a large amount of liquid that exceeds the absorption amount is liable to cause liquid return and leakage.
The excretory part is a part directly receiving excretion of urine, soft stool, menstrual blood or vaginal discharge in the absorber and its vicinity.

The basic weight and density of each part of the above-mentioned absorber 10 are obtained as follows.
As shown in FIG. 2, the basis weight in the planar direction of the absorbent body 10 is obtained as follows. First, when the absorber 10 is viewed in plan, the protruding liquid absorption storage part 12 and the liquid receiving layer part 11 below it are cut out integrally, and the liquid receiving layer part 11 of the concave part 13 is cut out to obtain a mass and a planar size. (Area) is measured and the basis weight is calculated.
Moreover, the basic weight of the thickness direction of the absorber 10 is calculated | required as follows. First, the protruding liquid absorption storage part 12 on the liquid receiving layer part 11 is cut out, the mass and the planar size (area) are measured, and the basis weight is calculated. The difference from the basis weight of the liquid receiving layer portion 11 of the recessed portion 13 measured previously becomes the basis weight of the protruding liquid absorption storage portion 12. Here, it is assumed that the basis weight of the liquid receiving layer portion 11 below the protruding liquid absorption storage portion 12 is equal to the basis weight of the liquid receiving layer portion 11 below the concave portion 13 adjacent thereto. The thickness of the liquid receiving layer part 11 and the protruding liquid absorption storage part 12 is the same as the liquid receiving layer part 11 and the liquid receiving part in the recess 13 from cross-sectional observation using a microscope [Microscope manufactured by Keyence Corporation (product name: VHX-1000)). The thickness of the protrusion liquid absorption storage part 12 which overlapped with the layer part 11 is measured, respectively.
Based on the measurement result, the density is calculated by the calculation of density = basis weight / thickness.

  The area ratio of each of the plurality of protruding liquid absorption storage parts 12 and the recesses 13 is obtained as follows. Using the above microscope, focusing on the concave portion 13, measuring a range including one or more protruding liquid absorption storage portions 12 and the concave portion 13, binarizing the concave portion from the image, and using the image processing apparatus, the area of the concave portion The rate is derived, and the difference is the area rate of the protruding liquid absorption storage unit 12. If necessary, use manual correction of the image analyzer. It is preferable to image the entire absorber at once and obtain the area ratio using an image analysis device. However, in the case where measurement is performed using a plurality of images, for example, a pixel (pixel) Sb of the protruding liquid absorption storage unit 12 in a predetermined region. Either ΣSb, the sum ΣSt of the pixels (pixels) St of the recess 13, or the sum ΣSb + ΣSt of the absorber pixels (pixels), and the area ratio is calculated, or the representative area ratios of parts having different area ratios And the total of the numerical values obtained by multiplying the ratio of the area of each part to the total area. The area ratio of the protruding liquid absorption storage unit 12 is ΣSb / (ΣSb + ΣSt), and the area ratio of the recess 13 can be calculated by ΣSt / (ΣSb + ΣSt).

  The area ratio is set such that the area ratio of the protruding liquid absorption storage section 12 is higher than the area ratio of the recess 13. The area ratio of the recess 13 is 100%-[area ratio (%) of the protruding liquid absorption storage section 12]. For example, the area ratio of the protruding liquid absorption storage unit 12 is set to 60% or more and 95% or less, preferably 65% or more and 90% or less, and more preferably 70% or more and 85% or less. If the area ratio of the protruding liquid absorption storage part 12 is too high, the area ratio of the recess 13 becomes too low, and the amount of liquid absorbed from the bottom of the recess 13 to the liquid receiving layer part 11 decreases, and the liquid receiving layer part. The diffusion of the liquid to 11 whole area becomes inadequate. On the other hand, if the area ratio of the protruding liquid absorption storage unit 12 is too low, the amount of liquid that can be stored in the protruding liquid absorption storage unit 12 decreases, and the amount of liquid absorbed as the absorber 10 decreases. Therefore, it is desirable that the area ratio of the protruding liquid absorption storage unit 12 be in the above range.

  Here, the flow and diffusion state of the liquid (for example, urine) supplied to the absorber 10 will be described in detail with reference to FIG.

As shown in FIGS. 3A and 3B, when the liquid L is supplied from above the absorber 10, most of the liquid L flows into the recess 13 from the surface of the protruding liquid absorption storage portion 12, and the recess 13. The liquid is passed through in all directions. At that time, a part of the liquid L supplied to the surface of the protruding liquid absorption storage unit 12 is directly absorbed into the protruding liquid absorption storage unit 12. Further, most of the liquid L passing through the recess 13 penetrates the liquid receiving layer portion 11 from the bottom of the concave portion 13 and diffuses in the liquid receiving layer portion 11 in all directions. Furthermore, a part of the liquid L passing through the recess 13 is diffused and absorbed from the side surface of the protruding liquid absorption storage unit 12 into the protruding liquid absorption storage unit 12. The liquid L diffused in the liquid receiving layer portion 11 is diffused from the liquid receiving layer portion 11 into the protruding liquid absorption storage portion 12 by capillary force. In this way, the liquid L is stored inside the protruding liquid absorption storage unit 12.
Since most of the liquid L supplied to the surface of the absorbent body 10 diffuses inside the liquid receiving layer portion 11, the protruding liquid absorption storage portion 12 side is defined as the skin contact surface side, and the liquid receiving layer portion 11 side. By using the absorbent body 10 on the non-skin contact surface side, the liquid L can be diffused in the liquid receiving layer portion 11 far from the skin side. As a result, the effect of reducing the feeling of stickiness on the skin can be obtained.

  On the other hand, as shown in FIG. 4, in the continuous absorber 20, when the liquid L is supplied to the surface, a part of the liquid L flows on the skin contact surface side surface 20S and spreads in all directions. The other liquid L is diffused into the continuous absorber 20. For this reason, in the continuous absorbency 20, when the liquid L such as urine is supplied to the surface 20S on the skin contact surface side, a feeling of stickiness to the skin is likely to occur.

In the absorbent body 10 of the above embodiment, since the density of the protruding liquid absorption storage section 12 is higher than the density of the liquid receiving layer section 11, most of the liquid supplied to the absorbent body 10 has a low density liquid receiving layer. It penetrates into the portion 11 and diffuses in the liquid receiving layer portion 11, and is absorbed and stored by the capillary force from the liquid receiving layer portion 11 into the high density protruding liquid absorption storage portion 12. Moreover, since the protruding liquid absorption storage part 12 is continuously arranged from the liquid receiving layer part 11, when the liquid diffuses from the liquid receiving layer part 11 to the protruding liquid absorption storage part 12, the diffusibility due to the presence of the interface. The liquid taken in the liquid-receiving layer part 11 without being lowered is smoothly absorbed and stored in the protruding liquid absorption storage part 12 having a high density by capillary force. Thereby, the improvement of the absorption performance of the absorber 10 can be aimed at.
In addition, since the area ratio of the plurality of protruding liquid absorption storage sections 12 is higher than the area ratio of the recesses 13 arranged between the respective protruding liquid absorption storage sections 12, the amount of liquid absorbed in the protruding liquid absorption storage section 12 is increased. It can be secured sufficiently.
Moreover, when a part of the absorbent body 10 is blocked by arranging a plurality of protruding liquid absorption storage parts 12, when an absorbent article (not shown) provided with the absorbent body 10 is mounted. The advantage that the adhesion (fitness) to the skin is improved is maintained. Furthermore, since the protrusion liquid absorption storage part 12 and the liquid receiving layer part 11 form a continuous body, the protrusion liquid absorption storage part 12 is reduced from being swung by an operation such as walking of the wearer and prevented from floating. Thus, the uncomfortable feeling at the time of wearing is eliminated, and the feeling of wearing is remarkably improved.

  Next, 2nd Embodiment of the absorber which concerns on this invention is described below, referring FIG.

As shown in FIG. 5, the absorbent body 10 (10B) of the second embodiment is similar to the absorbent body 10 (10A) of the first embodiment described above, and the liquid receiving layer portion 11, the protruding liquid absorption storage portion 12, and A recess 13 is arranged. Further, the protruding liquid absorption storage part 12 and the concave part 13 are arranged so that the area ratio of the plurality of protruding liquid absorption storage parts 12 is higher than the area ratio of the concave part 13. Further, the density of the protruding liquid absorbing and storing part 12 is higher than the density of the liquid receiving layer part 11 below, and closer to the density of the liquid receiving layer part 11 at the bottom of the recess 13 than the liquid receiving layer part in the first embodiment. ing. Therefore, the protruding liquid absorption storage unit 12 can easily receive the liquid from the liquid-receiving layer unit 11 by using capillary force, and more easily absorb the liquid. Furthermore, the density of the liquid receiving layer part 11 at the bottom of the recess 13 is lower than the density of the protruding liquid absorption storage part 12. The densities of the liquid receiving layer part 11 and the protruding liquid absorption storage part 12 are preferably set to the same values as those of the absorbent body 10 of the first embodiment described above.
Thereby, it becomes easy to absorb the liquid also from the liquid receiving layer portion 11 at the bottom of the concave portion 13. And since the absorbed liquid diffuses in the liquid receiving layer part 11 and is absorbed into the protruding liquid absorption storage part 12 from the lower part of the protruding liquid absorption storage part 12, the liquid absorbency of the absorber 10B is further improved. .

  Next, 3rd Embodiment of the absorber which concerns on this invention is described below, referring FIG.

As shown in FIG. 6, the absorbent body 10 (10C) of the third embodiment is similar to the absorbent body 10 (10A) of the first embodiment described above, and the liquid receiving layer portion 11, the protruding liquid absorption storage portion 12, and A recess 13 is arranged. Further, the protruding liquid absorption storage part 12 and the concave part 13 are arranged so that the area ratio of the plurality of protruding liquid absorption storage parts 12 is higher than the area ratio of the concave part 13. Furthermore, the density of the protruding liquid absorption storage part 12 is higher than the density of the liquid receiving layer part 11 below. Accordingly, the protruding liquid absorption storage part 12 is easy to absorb the liquid from the liquid receiving layer part 11 by utilizing capillary force. Furthermore, the density of the side surface of the protruding liquid absorption storage part 12 is lower than the density of the central part of the protruding liquid absorption storage part 12. It is preferable that the density of the center part of the liquid receiving layer part 11 and the protrusion liquid absorption storage part 12 is set to the same value as that of the absorber 10 of the first embodiment described above. Further, the density of the side surface of the protruding liquid absorption storage unit 12 is set to a value equivalent to the density of the liquid receiving layer part 11 described above or higher than the density of the liquid receiving layer part 11 described above. It is preferable to set a value lower than the density at the center of 12.
Thereby, it becomes easy to absorb a liquid also from the side surface of the protrusion liquid absorption storage part 12. And since the liquid absorbed from the side surface of the protrusion liquid absorption storage part 12 is diffused and stored in the central part of the protrusion liquid absorption storage part 12, the speed of storing the liquid in the absorber 10C is increased.

  In the configuration of the absorbent body 10C, the vertical cross-sectional shape of the protruding liquid absorption storage unit 12 is a trapezoid, but may be a rectangle. Moreover, it is preferable to arrange | position the low density area | region of the protrusion liquid absorption storage part 12 side surface seen in the cross section so that thickness may become thin as it goes to the surface side of the protrusion liquid absorption storage part 12. FIG. This reduces liquid diffusion on the surface side. Moreover, it is preferable to arrange | position the low density area | region of the protrusion liquid absorption storage part 12 side seen in the cross section only to the liquid receiving layer part 11 side. As a result, the diffusion of the liquid on the side of the protruding liquid absorption storage part 12 can be performed in a region close to the liquid receiving layer part 11.

  Next, 4th Embodiment of the absorber which concerns on this invention is described below, referring FIG.

As shown in FIG. 7, the absorbent body 10 (10D) of the fourth embodiment is similar to the absorbent body 10 (10A) of the first example described above. A recess 13 is arranged. Further, the protruding liquid absorption storage part 12 and the concave part 13 are arranged so that the area ratio of the plurality of protruding liquid absorption storage parts 12 is higher than the area ratio of the concave part 13. Furthermore, the density on the upper side of the protruding liquid absorption storage part 12 is higher than the density of the liquid receiving layer part 11 below. Accordingly, the protruding liquid absorption storage part 12 is easy to absorb the liquid from the liquid receiving layer part 11 by utilizing capillary force. Furthermore, the liquid receiving layer portion 11 at the bottom of the recess 13 has a larger basis weight at the outer side than the central portion in the longitudinal direction. The basis weight of the bottom of the liquid receiving layer portion 11 of the longitudinal outer side of the recess 13 has a basis weight from 10 to 300 g / ^{m 2} in the central portion in the longitudinal direction, more preferably 20 to 250 g / ^{m 2,} more preferably It is preferably 30 to 200 g / m ² or more.

  Specifically, by changing the thickness of the liquid receiving layer portion 11 at the bottom of the concave portion 13, in other words, by changing the depth of the concave portion 13, the basis weight of the outer portion becomes larger than the central portion in the longitudinal direction. It is like that. For example, in order to increase the basis weight, the thickness of the liquid receiving layer portion 11 may be increased (the depth of the concave portion 13 is reduced), and in order to reduce the basis weight, the thickness of the liquid receiving layer portion 11 is decreased ( What is necessary is just to deepen the depth of the recessed part 13).

  Thereby, the liquid taken in into the liquid receiving layer part 11 becomes easy to be drawn into the outer side part of absorber 10D. For this reason, when the absorbent body 10D is applied to a diaper as an absorbent article, the liquid excreted is taken in at the central part of the liquid receiving layer part 11 and drawn into both outer parts, so that the amount of the liquid taken up is increased. The absorbed liquid can be absorbed by the protruding liquid absorption storage section 12 in the entire absorber 10D, so that the amount of absorption can be improved.

  In the configuration of the absorber 10D, it is preferable that the density of the liquid receiving layer portion 11 at the bottom of the recess 13 is lower than the density of the protruding liquid absorption storage portion 12 as in the second embodiment described above. Moreover, the density of the side surface of the protrusion liquid absorption storage part 12 may be lower than the density of the center part of the protrusion liquid absorption storage part 12 like the above-mentioned 3rd Embodiment.

  When the absorber 10 is used so that the liquid is supplied from the protruding liquid absorption storage unit 12 side, a large amount of liquid (especially liquid with low viscosity of 5 mm · Pa · sec or less such as urine) is discharged. Sometimes, the liquid is guided along the recess 13 in the longitudinal direction. This is an effect due to the shape (concave portion) recessed from one surface of the absorbent body 10, and is a result of the liquid flowing into the concave portion 13 and mainly expressing the function as a water channel (see FIG. 8 (1)). On the other hand, when the liquid receiving layer 11 is used so that the liquid is supplied, when a large amount of low-viscosity liquid such as 5 mm · Pa · sec is discharged, When the liquid reaches the concave portion, the liquid overflows into the space formed by the concave portion 13, and the liquid movement in the concave portion 13 is mainly expressed by the wall surface of the concave portion 13 (see FIG. 8B). Regardless of which effect is mainly exhibited, if the first recess 21 of the absorbent body having the same structure and composition is provided, a liquid having a low viscosity exhibits an equivalent liquid introduction effect.

  As shown in FIG. 8 (1), in order to configure the absorbent main body 15 using the absorbent body 10 of the present invention so that liquid is supplied from the protruding liquid absorption storage section 12 side, the protruding liquid of the absorbent body 10 is used. The top sheet 16 is arranged on the absorption storage unit 12 side, and the back sheet 17 is arranged so as to be joined around the top sheet 16 and so as to wrap around the liquid receiving layer unit 11 side of the absorber 10. do it.

  The top sheet 16 is preferably formed of a hydrophilic nonwoven fabric. The hydrophilic nonwoven fabric is an air-through nonwoven fabric, a point-bonded nonwoven fabric, a spunbonded nonwoven fabric, a spunlace nonwoven fabric, and a three-dimensionally shaped nonwoven fabric. A fiber that has been subjected to a hydrophilic treatment with a composite fiber of polyethylene terephthalate and polyethylene can be preferably used.

  The said back surface sheet 17 will not be specifically limited if it has waterproofness and moisture permeability. For example, a film is formed by melt-kneading a hydrophobic thermoplastic resin, a fine inorganic filler made of calcium carbonate or the like or an incompatible organic polymer, and the film is obtained by uniaxial or biaxial stretching. A porous film is mentioned. Examples of the thermoplastic resin include polyolefin. Examples of the polyolefin include high to low density polyethylene, linear low density polyethylene, polypropylene, polybutene and the like, and these can be used alone or in combination.

  Moreover, in the absorptive main body 15, although not shown in figure, it is preferable that the skin contact surface side of the absorber 10 is coat | covered with the coating sheet. Furthermore, not only the skin contact surface side but also the non-skin contact surface side may be covered with a covering sheet, or the absorbent body 15 may be covered with the covering sheet. Furthermore, it is preferable that a pair of side sheets forming an inner three-dimensional gather is laminated on the skin contact surface side of the top sheet 16. Furthermore, it is preferable that the back sheet 17 and the leak-proof sheet are provided in this order on the non-skin contact surface side.

  Next, an example of a manufacturing apparatus preferably used for manufacturing the absorbent body 10 of the present invention will be described below with reference to FIG.

  As shown in FIG. 9, the absorbent body manufacturing apparatus 100 includes a rotatable fiber stacking drum 101. A suction part 102 is arranged in the fiber stacking drum 101. In addition, a supply unit 103 is provided on the outer peripheral surface of the stacking drum 101 to supply pulp and superabsorbent polymer (SAP), which are constituent materials of the absorbent body 10, on the air. The supply unit 103 includes a pulp supply unit 104 for crushing and supplying pulp and a polymer supply pipe 105 for supplying a superabsorbent polymer, and the supplied pulp and superabsorbent polymer are arranged on the outer periphery of the stacking drum 101. The surface has a duct 106 for air conveyance. The fiber stacking drum 101 is partitioned on the drum surface in the shape of an absorbent body, and a fiber stacking cavity 107 is disposed in which the absorbent body is stacked. The bottom surface of the stacking cavity 107 has a large number of ventilation holes (not shown), and the air supplied into the stacking cavity 107 is sucked by the suction part 102 through the ventilation holes. In addition, a non-suction protrusion 108 is provided on the bottom surface of the fiber stacking cavity 107 to provide a recess in the absorber. The protrusion 108 has a shape obtained by transferring the shape of the recess disposed in the absorber. Further, an unloading means (not shown) for unloading the stacked absorbent body is arranged at the lower part of the stacking drum 101.

  In the absorbent body manufacturing apparatus 100 having the above-described configuration, the pulverized pulp and the highly water-absorbing polymer supplied together with the carrier gas (for example, air) by the supply unit 103 are supplied into the fiber stacking cavity 107 and predetermined by the suction force of the suction unit 102. The absorber is manufactured by depositing in shape. The density of the absorber can be adjusted to a desired density by adjusting the supply amount of pulverized pulp and superabsorbent polymer per hour, the wind speed (wind pressure) at the time of supply, and the like.

Specifically, as shown in FIG. 10 (1), for example, pulverized pulp 111 and a superabsorbent polymer 112 are deposited in a pile cavity 107 disposed on the outer periphery of the pile drum 101. In addition, since the stacking cavity 107 is arranged on the outer periphery of the stacking drum 101, the bottom surface may be curved along the outer peripheral surface thereof. Subsequently, as shown in FIG. 10 (2), the pulverized pulp 111 and the superabsorbent polymer 112 are further deposited in the stacking cavity 107 to form the protruding liquid absorption storage unit 12. And when the protrusion liquid absorption storage part 12 in the fiber pile cavity 107 becomes the height equivalent to the projection part 108, supplying and depositing the pulverized pulp 111 while suppressing the supply of the superabsorbent polymer 112, FIG. 10 (3), the liquid receiving layer portion 11 is formed. Since the protruding liquid absorption storage part 12 and the liquid receiving layer part 11 are continuously deposited in this way, the deposition is completed without generating an interface between the protruding liquid absorption storage part 12 and the liquid receiving layer part 11. The absorber 10 can be manufactured. Thereafter, the absorber 10 deposited from inside the fiber stack cavity 107 is peeled off, and a pressing process is performed in which only the protruding liquid absorption storage part 12 having a large thickness is pressurized and compressed so that the protruding liquid absorption storage part 12 is A density difference is generated between the liquid receiving layer portion 11 at the bottom of the concave portion 13 so as to have a high density. Furthermore, the absorber 10 is completed by inverting it up and down, as shown in FIG. 10 (4).
Therefore, in the manufacturing apparatus 100 of the said absorber, the protrusion liquid absorption storage part 12 is comprised previously, and the liquid receiving layer part 11 is comprised continuously after that.

  Although there is no restriction | limiting in particular as the structural material, the absorber 10 manufactured by pile fiber (deposition) can use a fiber material, a porous body, those combinations, etc. Examples of fiber materials include natural fibers such as wood pulp, cotton and hemp, polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, single fibers made of synthetic resins such as polyvinyl alcohol resin, and these resins. A composite fiber containing two or more kinds, or a semi-synthetic fiber such as acetate or rayon can be used. When using a fiber made of a synthetic resin, the fiber may be a heat-shrinkable fiber that changes its shape by heat. For example, heat increases the fineness but shortens the fiber length, or heat hardly changes the fineness, but the shape is deformed into a coil shape and the apparent fiber occupies a shorter length. May be. As the porous body, a sponge, a nonwoven fabric, an aggregate of a superabsorbent polymer, or the like can be used.

  As the superabsorbent polymer contained in the absorbent body 10, a polymer that can absorb and hold a liquid having a weight five times or more of its own weight and can be gelled is preferable. The shape is not particularly limited and may be spherical, massive, grape-like, powdery or fibrous. The particle size is preferably 1 μm to 1000 μm, more preferably 10 μm to 500 μm. Examples of such superabsorbent polymers include polyacrylic acid and its salts and polyacrylate graft weights such as starch, cross-linked carboxymethylated cellulose, polymers or copolymers of acrylic acid or alkali metal acrylates. Coalescence can be mentioned. As the polyacrylic acid salt, a sodium salt can be preferably used. In addition, a comonomer such as maleic acid, itaconic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2-hydroxyethyl (meth) acrylate or styrenesulfonic acid is added to acrylic acid. Copolymers copolymerized within a range that does not deteriorate the performance of the superabsorbent polymer can also be preferably used.

  Although it is not essential in the present invention that the absorbent body 10 contains the superabsorbent polymer, when the absorbent body 10 contains the superabsorbent polymer, the superabsorbent polymer occupies the mass of the absorbent body 10. The proportion is preferably 5% by mass to 95% by mass. In particular, in the case of an article that absorbs a low excretion amount of liquid such as a sanitary napkin or light incontinence, 10% by mass to 30% by mass is preferable, and in the case of an article that absorbs a high excretion amount of liquid such as a diaper, 50% by mass. It is preferable that it is -80 mass%.

  Regardless of whether the absorbent body 10 contains or does not contain a superabsorbent polymer, the absorbent body 10 has a holding amount of 0.9 mass% sodium chloride aqueous solution of 0.1 g or more, particularly 1 g or more, per 1 g of the absorbent body. Is preferable from the viewpoint of expressing stable absorption performance. In order to realize such a holding amount, as a constituent material of the absorbent body 10, fibers having high hydrophilicity and high capillary force (for example, pulp, rayon, etc.) and not dull even when wet (not plasticized or wet) It is advantageous to use a combination of synthetic fibers (which do not decrease strength) and superabsorbent polymers.

  In order to manufacture the absorber 10 (10A, 10B), first, the protruding liquid absorption storage unit 12 is piled in a state where the density becomes high. As a specific example, for example, the protrusion 108 having a height smaller than the depth of the stacking cavity 107 is installed so as to obtain the shape shown in FIG. 12, and fluff pulp and superabsorbent polymer are deposited on the stacking cavity 107. Let First, the protruding liquid absorption storage unit 12 is deposited, and then the liquid receiving layer unit 11 is deposited. As a result, the suction force at the time of deposition of the liquid receiving layer portion 11 is reduced by the influence of deposits deposited on the protruding liquid absorption storage portion 12, and the density is lower than that of the protruding liquid absorption storage portion 12. The density difference occurs from the top of the protruding liquid absorption storage part 12 to the liquid receiving layer part 11. Further, after the pulp and the superabsorbent polymer are deposited, the deposited absorbent body 10 is peeled from the stacking cavity 107 and pressed. At this time, a positive pressure is applied to the protruding liquid absorption storage part 12 having a large basis weight and thickness, thereby causing a density difference between the protruding liquid absorption storage part 12 and the liquid receiving layer part 11 at the bottom of the recess 13. The liquid absorption storage part 12 has a higher density than the liquid receiving layer part 11 at the bottom of the recess 13. Finally, the absorber 10 is inverted, and the absorber 10 having the liquid receiving layer portion 11 on the non-skin contact surface side is produced.

  Moreover, the absorber 10 (10C) of the said 3rd Embodiment makes the cross-sectional shape of the protrusion part 108 the trapezoid shape in which the fiber drum 101 side becomes a long side, and is the same method as said absorber 10A and 10B. Perform piles. Since the cross-sectional shape of the protruding portion 108 is a trapezoidal shape, the cross-section of the accumulated protruding liquid absorption storage portion 12 has a trapezoidal shape with the liquid receiving layer portion 11 side as a long side. Thereby, the top part of the protrusion liquid absorption storage part 12 turns into a trapezoid-shaped upper surface, and the difference in basic weight and thickness arises from a top part to a bottom part. Furthermore, by performing press working after the absorbent body 10 is peeled from the stacking cavity 107, the trapezoidal top surface, which is the top of the protruding liquid absorption storage section 12, is positively subjected to pressure, and the central portion of the protruding liquid absorption storage section 12 And a side difference of the protruding liquid absorption storage unit 12 cause a density difference. Finally, the absorbent body 10 having the liquid receiving layer portion 11 on the non-skin contact surface side is produced by inverting the absorbent body 10.

  Next, a method of depositing the pulverized pulp 111 and the superabsorbent polymer 112 by changing the basis weight of the liquid receiving layer portion 11 at the bottom of the recess 13 will be described with reference to FIG.

The height of the protrusion 108 arranged in the fiber stacking cavity 107 shown in FIG. 11 (1) will be described below. In addition, the center part and outer side part of the absorber 10 demonstrated below are as having demonstrated with the said FIG.
As shown in FIG. 11 (2), in order to reduce the basis weight of the liquid receiving layer portion 11 at the bottom of the recess 13 at the center of the absorbent body 10, the fiber stack cavity 107 corresponding to the portion where the recess 13 is disposed. The height of the inner protrusion 108 is set higher than that of the outer portion so that the liquid receiving layer portion 11 is deposited thinner than the outer portion.
On the other hand, as shown in FIG. 11 (3), in order to increase the basis weight of the liquid receiving layer portion 11 at the bottom of the recess 13 in the outer portion of the absorbent body 10, the stacked fibers corresponding to the portion where the recess 13 is disposed. The height of the protruding portion 108 in the cavity 107 is set lower than that of the outer portion so that the liquid receiving layer portion 11 is deposited thickly.
Further, as shown in FIG. 11 (4), in the vicinity of the boundary from the central portion to the outer portion of the absorber 10, the height of the protruding portion 108 may be gradually lowered from the central portion toward the outer portion. . By doing so, no step is generated in the protruding portion 108 at the boundary between the central portion and the outer portion, so that the concave portion 13 having no step is disposed. Therefore, the liquid supplied to the absorber 10 is smoothly passed through the recess 13 to the outer portion of the absorber 10 and further toward the outer portion, the thickness of the liquid receiving layer portion 11 at the bottom of the recess 13 increases. Since it becomes thicker, the amount of diffusion can be increased.

For example, the pulverized pulp 111 and the superabsorbent polymer 112 are deposited in the stacking cavity 107 in which the protrusion 108 is formed with the thickness of the central portion in the longitudinal direction of the absorbent body 2 mm and the thickness of the outer peripheral portion 1 mm as described above. By doing so, as shown in FIG. 12 (1), it is possible to deposit thinly so that the basis weight of the liquid receiving layer portion 11 at the bottom of the recess 13 at the center of the absorbent body 10 is 50 g / m ^2. It can be deposited thickly so that the basis weight of the liquid receiving layer portion 11 at the bottom of the concave portion 13 in the outer portion of the body 10 is 100 g / m ² .
On the other hand, when the height of the protruding portion 108 is not changed, the thickness of the liquid receiving layer portion 11 at the bottom of the recess 13 is constant over the entire area of the absorber 10, as shown in FIG. The basis weight is also constant.

  Next, an example in which the above-described absorbent body 10 is applied to a disposable diaper (hereinafter referred to as a diaper) 50 will be described with reference to FIG. In addition, in FIG. 13, the surface sheet 16 of the longitudinal direction center part of the diaper 50 is notched.

  As shown in FIG. 13, the diaper 50 has a constricted shape in the center in the longitudinal direction corresponding to the crotch part as a whole. The top sheet 16 and the back sheet 17 respectively extend outward from the left and right side edges and both front and rear ends of the absorbent body 10. The surface sheet 16 has a width direction S smaller than the width direction of the back sheet 17. The diaper 50 is an unfolded diaper, and a pair of fastening tapes FT are attached to both side edges at one end in the longitudinal direction L. Further, a landing tape LT is attached on the back sheet 17 at the other end.

  The diaper 50 includes a three-dimensional gather that can rise above the widthwise side edge of the absorbent body 10. That is, a sheet material (side sheet) 18 for a three-dimensional gather having a gather elastic member 56 is arranged on each side of the diaper 50 in the longitudinal direction L to form a three-dimensional gather. Further, on one side of the diaper 50 in the longitudinal direction L, a pair of right and left leg elastic members 58 and 58 (two in this drawing) for leg gathers are arranged to form a leg gather. Yes. Leg elastic members 58 for leg gathers are arranged substantially linearly in an extended state in the leg flaps extending outward from both longitudinal edges of the absorbent body 10.

  One or a plurality of gather elastic members 56 (three in this drawing) are fixed to one side edge of the sheet material 18 for three-dimensional gathers in an expanded state. The sheet material 18 is bonded to the surface sheet 16 along the longitudinal direction L of the diaper 50 at positions outside the left and right side edges of the absorbent body 10 in the width direction S, and the bonded portion is a three-dimensional gather. It is a rising base. The sheet material 18 extends outward in the width direction S of the diaper 50 from the rising base end portion, and is joined to the back sheet 17 at the extended portion. The sheet material 18 is bonded onto the top sheet 16 at the front and rear end portions in the longitudinal direction L of the diaper 50.

As the sheet material 18 for three-dimensional gathers, a liquid impermeable or water repellent and moisture permeable material is preferably used. Examples of the sheet material 18 include a liquid-impermeable or water-repellent porous resin film, a liquid-impermeable or water-repellent nonwoven fabric, or a laminate of the porous resin film and the nonwoven fabric. Examples of the nonwoven fabric include thermal bond nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, and SMMS nonwoven fabric. The basis weight of the sheet material 18 preferably ^{5g / m 2 ~30g / m 2} , more preferably from ^{10g / m 2 ~20g / m 2} .

The surface sheet 16 can be any of various types conventionally used in this type of diaper, and is not limited as long as it can transmit a liquid such as urine. For example, synthetic fiber or natural fiber And woven fabrics, nonwoven fabrics, and porous sheets. As an example of the surface sheet 16, a core-sheath structure type (including side-by-side type) composite fiber using polypropylene or polyester as a core component and polyethylene as a sheath component is formed into a web by carding, and then non-woven fabric (after this) And a predetermined portion may be subjected to a hole opening treatment). From the viewpoint of high liquid permeability (dry feeling), an apertured sheet made of polyolefin such as low density polyethylene can also be preferably used.
As the back sheet 17, various types conventionally used in this type of diaper can be used, and a liquid-impermeable or water-repellent and moisture-permeable sheet is preferably used. As the back sheet 17, for example, a sheet that can be used as the above-described sheet material 18 for forming a three-dimensional gather can be used. Further, the width of the back sheet 17 is set to be approximately the same as the width of the absorbent body 10 and is disposed on the non-skin contact surface side of the absorbent body 10. You may provide the laminated body of a nonwoven fabric and a film, etc. as a sheet | seat which comprises the external shape of a diaper.
The non-skin contact surface is a surface directed toward the clothing side (the side opposite to the wearer's skin side) when the diaper is worn. Hereinafter, the term skin contact surface may be used, and the skin contact surface is a surface directed toward the wearer's skin when the diaper is worn.

  This diaper 50 can be used in the same manner as a normal unfolded diaper. This diaper 50 has both a high absorption amount and a comfortable wearing feeling due to the action of the absorbent body 10, and the elastic surface is used for the liquid-receiving layer portion 11 serving as a base sheet, so that the skin surface that undulates in a complicated manner. It conforms to the human body conforming to contact with the surface without any gaps, and has the ability to follow the movement of the wearer's body and maintain the state of contact with the skin surface. .

  The top sheet 16 is preferably made of a material that is liquid permeable and soft against the skin. For example, a non-woven fabric made of natural fibers such as cotton or a non-woven fabric made of various synthetic fibers subjected to hydrophilic treatment can be used. The back sheet 17 is preferably made of a liquid-impermeable sheet material. The back sheet 17 may be water vapor permeable as required. Specifically, in order to obtain sufficient water vapor permeability, a film made of synthetic resin such as polyethylene in which fine powder made of a filler such as calcium carbonate is dispersed is stretched and a porous film having fine holes is used. preferable. Examples of the side sheet include a nonwoven fabric, a film sheet, and paper. From the viewpoint of leakage prevention, it is preferable that the side sheet is formed of a liquid non-permeable or hardly permeable hydrophobic nonwoven fabric, a leakage-proof film sheet, or the like. One sheet may be used, or two or more sheets may be combined with a functional sheet.

  The said absorbent article is not restrict | limited to said embodiment, It can apply to this kind of absorbent article, for example, a disposable diaper, an incontinence pad, an incontinence liner, etc. Moreover, it is effective not only for urine but also for menstrual blood, orimono, loose stool, and the like. In addition to the top sheet 16, the absorbent body 10, the back sheet 17, and the side sheet, members may be appropriately incorporated in accordance with the use and function. In addition, the material of the surface sheet 16, the absorber 10 and the back surface sheet 17 of the said embodiment, the conditions in a manufacturing method, and the dimensional specification of a product are not specifically limited, The various materials normally used can be used.

Examples and comparative examples will be described below.
[Example 1]
The absorber 10 of Example 1 was produced as follows. First, the protruding portion 108 having a height of 2 mm was disposed so as to obtain the shape shown in FIG. The cross-sectional shape of the protrusion 108 is a rectangle. Then, fluff pulp (made by Warehauser, trade name NB416) and superabsorbent polymer (made by Nippon Shokubai Co., trade name Aquaric CA W101) were deposited in the stacking fiber cavity 107. At this time, the basis weight of the protruding liquid absorption storage part 12 is 200 g / m ^{2 for the} pulp and 320 g / m ² for the superabsorbent polymer, and the basis weight of the liquid receiving layer part 11 at the bottom of the recess 13 is 50 g for the pulp. / M ² , the superabsorbent polymer is 50 g / m ² . After the deposition, the deposited absorbent body 10 was peeled from the stacking cavity 107 and pressed at a pressure of 0.025 MPa. The absorbent body 10 was inverted and arranged so as to have the liquid receiving layer portion 11 on the non-skin contact surface side, and the whole was covered with a tissue having a basis weight of 16 g / m ² .
[Example 2]
The absorbent body 10 of Example 2 was manufactured in the same procedure as in Example 1 except that the height of the protrusion 108 was 2 mm at the center in the longitudinal direction of the absorber and 1 mm at the outer side.
[Comparative Example 1]
The absorbent body of Comparative Example 1 performs fiber filling in the same manner as in Example 1 except that the height of the protrusion 108 is set to 6 mm for the fiber stacking cavity 107 having a depth of 6 mm, and does not have a liquid receiving layer portion. Got independent blocks. The obtained block was arranged in the shape shown in FIG. 12, and then the whole was covered with a tissue having a basis weight of 16 g / m ² .
[Comparative Example 2]
Similarly to Comparative Example 1, the absorbent body of Comparative Example 2 performs fiber filling in the same manner as in Example 1 except that the height of the protruding portion 108 is set to 6 mm for the fiber stacking cavity 107 having a depth of 6 mm. An independent block was obtained without a layer. After the obtained block was arranged in the shape shown in FIG. 12 on a pulp sheet having a basis weight of 50 g / m ² prepared in a separate process, the whole was covered with a tissue having a basis weight of 16 g / m ^2. did.

Next, as the performance evaluation of the absorbent body 10 of the present invention, the droop rate and the liquid return amount were examined.
The kink ratio of the absorber 10 was calculated | required as follows.
As shown in FIG. 14, the above-mentioned diaper 50 equipped with the absorber described below is attached to the gait test device 200, and walking and the injection of physiological saline into the absorber are repeated, so that the droop rate is increased. The required test was conducted. The walking test apparatus 200 is made by imitating a human body shape, for example, imitating from the upper abdomen to the thigh, and the thigh performs the same operation as human walking. It is.
As for the walking conditions, first, walking was performed for 1 minute at a walking speed of 120 steps per minute. Immediately after that, physiological saline was supplied to the absorber at a supply rate of 8 g per second, and walking was further performed for 10 minutes at a walking speed of 120 steps per minute. The physiological saline supply and 10-minute walking were taken as one set, and 5 sets were repeated continuously. As a result, a total of 40 g of physiological saline is supplied to the absorber.
Thereafter, the kink ratio (%) of the absorbent body in the crotch region was determined by the following equation.
Shaking rate = [1- (absorber width after walking) / (absorber width before walking)] × 100 (%)
Moreover, the floating state of the protrusion liquid absorption storage part of an absorber was confirmed by visual observation.

  With respect to the three types of absorbers of the continuous absorber shown in FIG. 4, the absorber in which the protruding liquid absorption storage unit disclosed in Patent Document 1 is independently arranged, and the absorber 10 of the present invention, the above test method is used. The groin rate was examined.

The liquid return amount of the absorber was determined as follows.
Place a cylinder with an inner diameter of 35 mm at the center in the longitudinal direction and the center in the width direction of the absorbent body, and maintain the liquid so that the height from the position of the absorbent body into which the liquid is injected is 10 mm, while using physiological saline as the liquid 40 g was injected. At the bottom of the cylinder, an acrylic plate (thickness 5 mm, length 250 mm, width 100 mm) is provided with a size that can cover the entire product. Ten minutes after the start of absorption, 40 g is injected again by the same method. This operation was repeated four times, and a total of 160 g of physiological saline was absorbed by the absorber. A filter paper (Advantech No. 5A) is cut into 100 mm x 100 mm in advance and 20 sheets are prepared (measured mass W1), 10 minutes after the start of the fourth injection, the absorbent centering on the injection point The sample was placed on top, applied with a pressure of 3.5 kPa, and after 2 minutes, the mass of the filter paper was measured (measured mass W2), and the liquid return amount was calculated according to the following equation.
Liquid return amount (g) = mass of filter paper after pressurization (W2) −mass of first filter paper (W1)
Table 1 shows the dripping rate, the floating state of the protruding liquid absorption storage unit, and the measured liquid return amount.

  As a result, as shown in Table 1, in the absorbent body 10 of the present invention, the kink rate is reduced and the protruding liquid absorption storage part is lifted more than the absorbent body in which the protruding liquid absorption storage part is arranged independently. Without any problem, it was found that the liquid return amount was reduced to 33% to 77%, and the effect of maintaining a smooth feeling at the time of wearing was obtained even after the liquid was absorbed. In Example 2, the amount of liquid return was further reduced by making the basis weight of the outer portion in the longitudinal direction higher than the basis weight of the central portion.

  The absorbent body 10 of the present invention is not limited to the above-described embodiment, but in addition to the unfolded diapers as described above, pants-type diapers, sanitary shorts, shorts-type napkins, sanitary napkins, incontinence pads, incontinence It can be used for an absorber contained in an absorbent article such as a liner. Moreover, even if the said absorbent article is for infants, it is applicable even if it is for adults. Furthermore, it is effective not only for urine but also for menstrual blood, orimono, loose stool and the like.

DESCRIPTION OF SYMBOLS 10 Absorber 11 Liquid receiving layer part 12 Projection liquid absorption storage part 13 Recessed part

Claims (6)

A liquid-receiving layer part that absorbs liquid and diffuses in a plane direction, and a protruding liquid absorption that absorbs and stores liquid that is arranged separately in a plurality of portions on one side of the liquid-receiving layer part and continuously to the liquid-receiving layer part A storage section,
The protruding liquid absorption storage part has a higher area ratio than the concave part arranged between the protruding liquid absorption storage parts,
The liquid-receiving layer part at the bottom of the concave part has a lower basis weight and density than the protruding liquid absorption storage part. The absorber according to claim 1, wherein the protruding liquid absorption storage part has a higher density than the liquid receiving layer part below the protrusion liquid absorption storage part. The absorbent body according to claim 1 or 2, wherein a density of a side surface of the protruding liquid absorption storage unit is lower than that of a central part of the protruding liquid absorption storage unit. The absorber according to any one of claims 1 to 3, wherein the liquid-receiving layer portion at the bottom of the recess has a larger basis weight at an outer portion than a central portion in the longitudinal direction of the absorber.   An absorbent article having the absorbent body according to any one of claims 1 to 4. The absorbent article which has an absorber of any one of the said Claim 1 thru | or 4, and arrange | positions the said liquid receiving layer part to the non-skin contact surface side.

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