JP3214679U - Absorbent laminate and absorbent article - Google Patents

Abstract

An absorbent laminate having a plurality of absorbent layers having a water-absorbent resin and no pulp fibers between sheet members, having a high absorption capacity, diffusibility, and absorbability, and the absorbent laminate Absorbent articles are provided. An absorbent laminate 10 having an upper absorbent layer 11 and a lower absorbent layer 21, wherein the upper absorbent layer 11 and the lower absorbent layer 21 are each made of a water absorbent resin between sheet members 12 and 22. The upper absorbent layer 11 is formed with a sealing portion 18 and a non-sealing portion 19 in the central region in the width direction x, and the lower absorbent layer 21 is configured to have no pulp fiber. The non-sealing part 29 is formed in the central region in the width direction x, the sealing part is not formed, and the water absorption rate by the vortex method of the water-absorbing resin disposed in the non-sealing part 19 of the upper absorbent layer 11 is The water absorption rate of the water absorbent resin disposed in the non-sealing portion 29 in the central region of the lower absorbent layer 21 is faster than the water absorption rate by the vortex method. [Selection] Figure 1

Description

  The present invention relates to an absorbent laminate used for absorbent articles such as urine pads (including light incontinence pads), sanitary napkins, disposable diapers, and the like, and an absorbent article provided with the same.

  DESCRIPTION OF RELATED ART Conventionally, the absorbent article provided with the absorber comprised so that it may have a water absorbing resin between sheet | seat members and may not have a pulp fiber is known. For example, Patent Literatures 1 to 3 disclose an absorbent article having an absorbent laminate in which a plurality of such absorbers are laminated.

JP 2004-313580 A JP 2011-136078 A Japanese Patent Laying-Open No. 2015-000236

  Since the absorbent body configured to have a water-absorbing resin between the sheet members and not to have pulp fibers does not have pulp fibers, it can be formed thin while securing an absorption capacity. In an absorbent laminate having a plurality of such layer structures, the absorption capacity can be increased according to the number of the layer structures. However, since the water-absorbent resin gels or swells when it absorbs body fluids such as urine, the absorbent laminate constructed in this way ensures diffusibility in the planar direction and thickness direction of the absorbent laminate. In addition, it is important that as much of the water-absorbing resin disposed in the absorbent laminate as possible contributes to absorption of urine and the like. Further, the absorbent body configured to have a water-absorbent resin between the sheet members and not to have pulp fibers, because the pulling force such as urine may be insufficient by not having pulp fibers, It is desirable to be able to absorb and fix urine and the like quickly.

  The present invention has been made in view of the above circumstances, and the object thereof is an absorbent laminate having a plurality of absorbent layers having a water-absorbing resin between sheet members and having no pulp fibers, and having a high absorption capacity. It is to provide an absorbent laminate having excellent diffusibility of urine and the like and capable of realizing rapid absorption of urine and the like, and an absorbent article including the absorbent laminate.

  The absorbent laminate of the present invention capable of solving the above problems is an absorbent laminate having a longitudinal direction and a width direction, which is used to absorb body fluids; An upper absorbent layer disposed on the skin surface side and a lower absorbent layer disposed on the non-skin surface side; each of the upper absorbent layer and the lower absorbent layer has a water absorbent resin between the sheet members It is configured so as not to have pulp fibers, has a sealing part in which sheet members are joined, and a non-sealing part in which sheet members are not joined, and a water-absorbing resin is arranged in the non-sealing part Each of the upper absorbent layer and the lower absorbent layer has an end region on both sides in the width direction and a central region located therebetween; the upper absorbent layer has a sealing portion formed in the end region, A sealing portion and a non-sealing portion are formed in the region; the lower absorbent layer has a sealing portion formed in the end region, A non-sealed portion is formed in the region and a sealed portion is not formed; the water absorption rate by the vortex method of the water absorbent resin disposed in the non-sealed portion in the central region of the upper absorbent layer is It is characterized in that it is faster than the water absorption rate by the vortex method of the water-absorbing resin arranged in the non-sealed part of the central region.

  By configuring the absorbent laminate of the present invention as described above, urine and the like are quickly absorbed and fixed in the upper absorbent layer, and urine and the like pass through the sealing portion in the central region of the upper absorbent layer. Since it can transfer to a lower absorption layer, the liquid return to the top sheet side, such as urine, can be suppressed in the absorptive article provided with the absorptive layered product. On the other hand, in the lower absorbent layer, a high absorption capacity can be realized by not forming a sealing portion in the central region in the width direction, and the lower absorbent layer can be realized by using a water absorbent resin having a slow water absorption rate. It is possible to ensure the diffusibility in the central region. Therefore, the absorptive laminate of the present invention has excellent absorption performance.

  In the central region of the upper absorbent layer, the non-sealing portion is preferably provided in a stripe shape extending in the longitudinal direction. Thus, by forming the non-sealing portion in the central region of the upper absorbent layer, the diffusibility of urine and the like in the upper absorbent layer is improved, and urine and the like can be absorbed quickly.

  It is preferable that the water absorption speed | rate by the vortex method of the water absorbing resin distribute | arranged to the non-sealing part of the center area | region of an upper side absorption layer is 20 seconds or less. Thereby, urine etc. can be rapidly absorbed and fixed in an upper absorption layer.

The amount (g / m ² ) of the water absorbent resin disposed in the non-sealed portion of the central region of the upper absorbent layer is the amount of the water absorbent resin (g / m ² ) disposed in the non-sealed portion of the central region of the lower absorbent layer ( g / m ² ). Thus, by adjusting the amount of the water-absorbing resin, the absorption capacity of urine and the like in the upper absorption layer can be increased, and the diffusibility of urine and the like can be increased in the lower absorption layer.

  In the sealing part, it is preferable that the sheet members are welded to each other. By forming the sealing portion in this manner, even when the absorption layer absorbs water, the sheet members are easily joined to each other, and diffusibility of urine or the like in the sealing portion is easily secured.

  It is preferable that the sheet | seat member of an upper side absorption layer consists of an air through nonwoven fabric comprised from the fiber containing a polyethylene resin. If the sheet member of the upper absorbent layer is composed of such a nonwoven fabric, the sheet member can be firmly joined to each other when the sealing portion is formed by heat sealing, ultrasonic welding, or the like. It is easy to ensure a high breaking strength. Therefore, even if the water-absorbing resin disposed in the upper absorbent layer absorbs urine or the like and swells, the sealing portion in the central region is easily maintained.

  In the upper absorbent layer, it is preferable that the basis weight of the sheet member disposed on the skin surface side is larger than the basis weight of the sheet member disposed on the non-skin surface side. By configuring the upper absorbent layer in this manner, urine or the like received by the absorbent laminate can be quickly drawn into the upper absorbent layer by the sheet member on the skin side of the upper absorbent layer. Etc. are easily absorbed quickly.

  The present invention also provides an absorbent laminate according to the present invention, a liquid-permeable top sheet provided on the skin side of the absorbent laminate, and a liquid impermeability provided on the non-skin side of the absorbent laminate. An absorbent article having an adhesive backsheet is also provided. Since the absorbent article of the present invention is provided with the absorbent laminate of the present invention described above, the absorbent article of the present invention has excellent absorption performance.

  The absorbent laminate of the present invention can absorb and fix urine etc. quickly in the upper absorbent layer, and urine etc. can pass through the sealing part in the central region of the upper absorbent layer and migrate to the lower absorbent layer. it can. On the other hand, in the lower absorbent layer, a high absorption capacity can be realized by not forming a sealing portion in the central region in the width direction, and the lower absorbent layer can be realized by using a water absorbent resin having a slow water absorption rate. It is possible to ensure the diffusibility in the central region. Therefore, the absorptive laminate of the present invention has excellent absorption performance.

An example of the absorptive layered product of the present invention is expressed, and the width direction sectional view of an absorptive layered product is expressed. The partial notch top view of the upper side absorption layer of the absorptive laminated body shown in FIG. 1 is represented. The partial notch top view of the lower absorption layer of the absorptive laminate shown in Drawing 1 is expressed. An example of the absorptive article provided with the absorptive layered product shown in Drawing 1 is expressed, and the top view which looked at the absorptive article from the skin side is expressed. The VV sectional view of the absorptive article shown in Drawing 4 is expressed.

  The absorbent laminate of the present invention is used to absorb body fluid such as urine, and is provided on absorbent articles such as urine pads (including incontinence pads), disposable diapers, and sanitary napkins. . The absorbent laminate absorbs and fixes body fluid such as urine received by the absorbent article, and is provided, for example, between the top sheet and the back sheet of the absorbent article.

  The absorbent laminate has a skin surface side and a non-skin surface side. The skin side means the wearer side when the wearer wears an absorbent article provided with the absorbent laminate, and corresponds to the top sheet side when the absorbent laminate is taken as a reference. The non-skin surface side means the side opposite to the wearer when the absorbent article is worn, that is, the outside, and corresponds to the back sheet side when taking the absorbent laminate as a reference. The direction extending from the skin surface side to the non-skin surface side is defined as the vertical direction.

  The absorbent laminate has a longitudinal direction and a width direction. The longitudinal direction means a direction extending in the front-rear direction of the wearer's crotch when the wearer wears the absorbent article provided with the absorbent laminate, and the width direction is on the same plane as the absorbent laminate. And means a direction perpendicular to the longitudinal direction. Moreover, let the direction on the surface formed from a longitudinal direction and the width direction be a plane direction.

  The shape (planar shape) of the absorbent laminate is not particularly limited. What is necessary is just to determine the shape of an absorptive laminated body suitably according to a use, for example, a rectangle, an hourglass shape, a gourd shape, a battledore shape etc. are mentioned.

  The absorbent laminate has an upper absorbent layer disposed on the skin surface side and a lower absorbent layer disposed on the non-skin surface side. The upper absorbent layer is disposed on the skin surface side of the lower absorbent layer, and is disposed on the top sheet side in the absorbent article. The upper absorbent layer basically receives urine or the like that has passed through the top sheet and has been transferred to the absorbent laminate before the lower absorbent layer. The upper absorbent layer is preferably disposed on the uppermost side of the absorbent laminate. The upper absorbent layer is preferably provided adjacent to the lower absorbent layer. The lower absorbent layer is disposed on the non-skin surface side of the upper absorbent layer, and is disposed on the back sheet side in the absorbent article. The lower absorbent layer is preferably disposed on the lowermost side of the absorbent laminate.

  The upper absorbent layer and the lower absorbent layer are each configured to have a water absorbent resin between the sheet members and have no pulp fibers. That is, in the upper absorbent layer and the lower absorbent layer, a sheet member is disposed on the skin surface side and a non-skin surface side of each absorbent layer, and a water absorbent resin is disposed between these sheet members. No pulp fiber is arranged between the members. In the upper absorbent layer and the lower absorbent layer, the presence of pulp fibers inevitably mixed in the production is allowed. Since the upper absorbent layer and the lower absorbent layer have a water-absorbing resin between the sheet members and no pulp fibers, they can be formed thin while having a high absorption capacity.

  Examples of water-absorbing resins include polyacrylic acid-based water-absorbing resins such as sodium polyacrylate; starch-acrylic graft copolymers, starch-acrylic acid graft copolymers, starch-acrylamide graft copolymers, and other starch-based water-absorbing resins. Water-absorbing resin: Polyvinyl alcohol-based water-absorbing resin such as crosslinked polyvinyl alcohol can be used. As the water-absorbing resin, it is preferable to use a polyacrylic acid-based water-absorbing resin such as sodium polyacrylate because it has a high liquid absorption.

  The sheet member is liquid permeable, for example, a nonwoven fabric formed from hydrophilic fibers such as cellulose, rayon, and cotton, polyolefin (for example, polypropylene, polyethylene), polyester (for example, PET), polyamide (for example, nylon). It is possible to use a non-woven fabric formed from hydrophobic fibers such as those having a hydrophobic fiber surface hydrophilized with a surfactant. Further, a woven fabric, a knitted fabric, a perforated plastic film or the like may be used as the sheet member. Preferably, a non-woven sheet member (non-woven sheet) is used as the sheet member.

Is not particularly limited basis weight of the sheet member may preferably 10 g / m ² or more, 14 g / m ² or more, and preferably more preferably 17 g / m ² or more and 50 g / m ² or less, 40 g / m ² The following is more preferable, and 30 g / m ² or less is more preferable.

  The upper absorbent layer and the lower absorbent layer may be provided with a sheet member on the skin surface side and a sheet member on the non-skin surface side separately, and one sheet member is folded and the folded one side is the skin surface side. A sheet member may be used, and the other side may be a non-skin-side sheet member. Moreover, the sheet member on the non-skin surface side of the upper absorbent layer may also serve as the sheet member on the skin surface side of the lower absorbent layer. Preferably, each of the upper absorbent layer and the lower absorbent layer has a first sheet member disposed on the skin surface side of each absorbent layer and a second sheet member disposed on the non-skin surface side, and the first sheet member A water-absorbing resin is disposed between the second sheet member and the second sheet member. In this case, each absorption layer is formed independently (separably).

  Each of the upper absorbent layer and the lower absorbent layer has an end region and a central region in the width direction. The end region is defined on both sides of each absorption layer in the width direction and is defined as a region including the edge in the width direction of each absorption layer. The central region is defined as a region between end regions of the respective absorption layers (that is, between one end region and the other end region in the width direction). In each absorbing layer, the length in the width direction of the central region is preferably 60% or more of the length in the width direction of the absorbing layer, more preferably 70% or more, and preferably 95% or less, 90% or less. Is more preferable.

  Each of the upper absorbent layer and the lower absorbent layer has a sealed portion in which the sheet members are joined together and a non-sealed portion in which the sheet members are not joined together. The sealing portion is formed by joining the sheet members with an adhesive or welding (heat sealing, ultrasonic welding, etc.). The non-sealing portion is defined as a portion where the sheet members are not joined to each other in each absorption layer, and the portion other than the sealing portion corresponds to the non-sealing portion. The non-sealing part is provided with a water-absorbing resin, and the sealing part may also be provided with a water-absorbing resin.

  Each of the upper absorbent layer and the lower absorbent layer is formed with a sealing portion in the end region in the width direction, which makes it difficult for the water absorbent resin to fall off from each absorbent layer. The sealing portion is preferably formed over the entire length in the end region of the upper absorbent layer and the lower absorbent layer.

  In the upper absorbent layer, both a sealing portion and a non-sealing portion are formed in the central region in the width direction. By forming the sealing portion in the central region of the upper absorption layer, urine and the like are easily diffused in the planar direction in the sealing portion, and the urine and the like pass through the sealing portion and move to the lower absorption layer. It becomes easy. As a result, the diffusibility of urine and the like in the absorbent laminate is enhanced, and urine and the like are quickly absorbed by the absorbent laminate.

  Although the arrangement | positioning aspect of the non-sealing part of the center area | region of an upper side absorption layer is not specifically limited, It is preferable that a non-sealing part is arrange | positioned at stripe shape or island shape. Thereby, in the central region of the upper absorbent layer, urine and the like are easily diffused in the plane direction through the sealing portion, and urine and the like are easily transmitted through the sealing portion and transferred to the lower absorbent layer. In the central region of the upper absorbent layer, it is preferable that two or more non-sealing portions are provided.

  When the non-sealing portions are arranged in a stripe shape, it is preferable that at least two non-sealing portions are provided so as to extend in one direction. When the non-sealing portions are arranged in a stripe shape, the sealing portions are also preferably arranged in a stripe shape. Preferably, the non-sealing portion is arranged in a stripe shape extending in the width direction or the longitudinal direction, more preferably in a stripe shape extending in the longitudinal direction. If the non-sealing portions are arranged in a stripe shape extending in the longitudinal direction, urine and the like are easily diffused in the longitudinal direction of the upper absorbent layer. Further, the non-sealing portion can be provided in a relatively wide area, and the absorption capacity of the upper absorption layer can be easily increased.

  In the case where the non-sealing portions are arranged in an island shape, it is preferable that at least two non-sealing portions are provided and the sealing portions are provided so as to surround the respective non-sealing portions. If the non-sealing portion is arranged in an island shape, urine or the like is easily diffused in the planar direction in the sealing portion surrounding the non-sealing portion.

  In the central region of the upper absorbent layer, the non-sealing portion is preferably provided in a stripe shape extending in the longitudinal direction. If the non-sealing portion is provided in this manner, diffusibility and permeability of urine and the like are increased in the upper absorption layer, and it is easy to secure the absorption capacity of the upper absorption layer.

  Each area of the sealing part and the non-sealing part in the central region of the upper absorbent layer is not particularly limited, but the area ratio of the sealing part and the non-sealing part is as follows: area of sealing part / area of non-sealing part 5/95 or more is preferable, 10/90 or more is more preferable, 15/85 or more is more preferable, 70/30 or less is preferable, 60/40 or less is more preferable, and 50/50 or less is more preferable.

  On the other hand, in the lower absorption layer, a non-sealing portion is formed in the central region in the width direction, and no sealing portion is formed. Thereby, the absorption capacity of the lower absorption layer can be increased. Moreover, urine etc. become difficult to transfer to the non-skin surface side of an absorptive layered product, and in an absorptive article provided with an absorptive layered product, leak from the back sheet side, such as urine, becomes difficult to occur. In the central region of the lower absorbent layer, the sealing portion is not formed, so that the diffusibility of urine or the like in the planar direction is reduced, and the absorption rate of urine or the like in the lower absorbent layer may be reduced. In the absorbent laminate, the upper absorbent layer is present on the skin side of the lower absorbent layer, so even when the absorption rate in the lower absorbent layer is reduced, urine etc. returns to the skin side of the absorbent laminate. No need to worry.

  The central region of the lower absorbent layer is preferably provided so as to overlap the sealing portion of the central region of the upper absorbent layer. More preferably, the central region of the lower absorbent layer is sealed with the central region of the upper absorbent layer. It is provided so as to extend outward in the width direction from the stop portion (outward in the width direction than the sealing portion positioned most outward in the width direction). The length in the width direction of the center region of the lower absorbent layer is preferably 0.7 times or more, more preferably 0.8 times or more, and more than 0.9 times the length in the width direction of the center region of the upper absorption layer. Is more preferable, 1.5 times or less is preferable, 1.3 times or less is more preferable, and 1.2 times or less is more preferable.

  Even if each absorption layer absorbs water in the sealing portion, it is preferable that the bonding between the sheet members is maintained. When the absorbent layer absorbs water, the water-absorbing resin disposed between the sheet members swells, and there is a possibility that the bonding between the sheet members is released at the sealing portion. In this case, it is assumed that the water-absorbing resin is dropped from each absorption layer, or the diffusibility of urine or the like in the sealing portion is lowered. Therefore, it is preferable that the sealing portion maintains the bonding between the sheet members even when the absorbing layer absorbs water. In addition, since an absorption layer is comprised in this way, it is preferable that each absorption layer has the sheet | seat member welded in the sealing part.

  When the sheet members are welded at the sealing portion, the sheet member is preferably partially welded at the sealing portion. That is, it is preferable that the sealing portion is provided with a welded portion where the sheet members are welded and a non-welded portion where the sheet members are not welded. Thus, by providing a welding part and a non-welding part in a sealing part, sheet members are firmly joined in a welding part, and permeability of urine etc. is improved in a non-welding part. Further, instead of the welded portion and the non-welded portion, a strong welded portion in which the sheet members are firmly welded and a weak welded portion in which the sheet members are weakly welded may be provided. The welded portion and the non-welded portion, or the strong welded portion and the weakly welded portion can be formed by heat sealing or ultrasonic welding the sheet members in a predetermined pattern.

  In the upper absorbent layer and the lower absorbent layer, the water absorbent resin is preferably fixed to the sheet member with an adhesive. That is, it is preferable that an adhesive is applied to the sheet member of each absorbent layer to provide an adhesive layer, and the water absorbent resin is fixed to the sheet member with the adhesive layer. The adhesive layer may be provided on at least one of the skin-side sheet member and the non-skin-side sheet member, but preferably the adhesive layer is provided on both sheet members. It is sufficient that at least a part of the water absorbent resin is fixed to the adhesive layer. For example, the water absorbent resin in contact with the adhesive layer may be fixed to the adhesive layer. If the water-absorbent resin is fixed to the sheet member by the adhesive layer, the water-absorbent resin is less likely to move between the sheet members before absorption of the water-absorbent resin, and the absorption capacity of urine and the like in the absorbent layer is ensured. It becomes easy. Even after absorption of the water-absorbent resin, the gelled water-absorbent resin is less likely to move between the sheet members. As a result, the water-absorbent resin is agglomerated, making it difficult for the wearer to feel uncomfortable.

  It is preferable that the adhesive layer does not inhibit water absorption or swelling by the water absorbent resin while fixing the water absorbent resin. As a method for forming the adhesive layer, a curtain spray method, a spiral coating method, an omega coating method, a coater method, or the like may be employed.

  Examples of the adhesive used for the adhesive layer include rubber adhesives such as natural rubber, butyl rubber and polyisoprene; styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer. Styrenic elastomers such as (SBS), styrene-ethylene-butadiene-styrene block copolymer (SEBS), styrene-ethylene-propylene-styrene block copolymer (SEPS); ethylene-vinyl acetate copolymer (EVA); polyolefin Elastomers, polyolefin waxes and the like can be used. These adhesives may use only 1 type and may use 2 or more types together. Among these, it is preferable to use a rubber adhesive or a styrene elastomer.

  The structural example of an absorptive laminated body is demonstrated with reference to FIGS. 1-3. 1 represents a cross-sectional view in the width direction of the absorbent laminate, FIG. 2 represents a partially cutaway plan view of the upper absorbent layer, and FIG. 3 represents a partially cutaway plan view of the lower absorbent layer. Arrows x, y, and z represent the width direction, the longitudinal direction, and the vertical direction of the absorbent laminate, respectively. In the vertical direction z, z1 represents the skin surface side, and z2 represents the non-skin surface side. 1 to 3 show examples of the absorbent laminate in which the non-sealing portions of the upper absorbent layer are arranged in a stripe shape, the arrangement and size of the sealing portions and the non-sealing portions are appropriately adjusted. In addition, the size and arrangement of the upper absorbent layer and the lower absorbent layer can be appropriately adjusted.

  The absorptive laminate 10 has an upper absorbent layer 11 disposed on the skin surface side z1 and a lower absorbent layer 21 disposed on the non-skin surface side z2. The upper absorbent layer 11 has a water absorbent resin 13 between the sheet members 12 and has no pulp fiber, and the lower absorbent layer 21 has a water absorbent resin 23 between the sheet members 22 and pulp. It is comprised so that it may not have a fiber. In the absorbent laminate 10, an adhesive is applied to the sheet members 12 and 22 to form adhesive layers 14 and 24, and the water absorbent resins 13 and 23 are fixed to the sheet members 12 and 22 by the adhesive layers 14 and 24. Has been.

  The upper absorbent layer 11 includes sealing portions 17 and 18 in which the sheet members 12 are joined together and a non-sealing portion 19 in which the sheet members 12 are not joined together. As shown in FIG. 2, the upper absorbent layer 11 has an end region 15 on both sides in the width direction x and a central region 16 positioned between them, and a sealing portion 17 is formed in the end region 15; A sealing portion 18 and a non-sealing portion 19 are formed in the central region 16.

  The lower absorbent layer 21 includes a sealing part 27 in which the sheet members 22 are joined together and a non-sealing part 29 in which the sheet members 22 are not joined together. As shown in FIG. 3, the lower absorbent layer 21 has end regions 25 on both sides in the width direction x and a central region 26 positioned therebetween, and a sealing portion 27 is formed in the end region 25. The non-sealing portion 29 is formed in the central region 26, and the sealing portion is not formed.

  The absorbent laminate of the present invention is configured as described above, and as a water absorbent resin disposed in the non-sealing portion in the central region of the upper absorbent layer, the non-sealing portion in the central region of the lower absorbent layer The water-absorbing resin having a higher water absorption rate than the water-absorbing resin disposed in the water is used. Specifically, the water absorption rate by the vortex method of the water-absorbing resin disposed in the non-sealing portion in the central region of the upper absorbent layer is the water-absorbing resin disposed in the non-sealing portion in the central region of the lower absorbent layer. It is faster than the water absorption rate by the vortex method. Thereby, urine etc. are easily absorbed and fixed easily by the upper absorbent layer, and in the absorbent article provided with the absorbent laminate, liquid return to the top sheet side of urine etc. can be suppressed. On the other hand, in the lower absorbent layer, there is a concern about a decrease in diffusivity in the planar direction of urine and the like due to the absence of a sealing portion in the central region. The diffusibility to the plane direction in the center area | region of an absorption layer is securable.

  Specifically, the water absorption rate by the vortex method of the water absorbent resin disposed in the non-sealed portion of the central region of the upper absorbent layer is preferably 20 seconds or less, more preferably 18 seconds or less, and 16 seconds or less. Is more preferable. Although the minimum of the said water absorption speed | rate is not specifically limited, 5 seconds or more are preferable and 8 seconds or more are more preferable. In addition, the water absorbing resin disposed in the non-sealed portion of the central region of the upper absorbent layer has a water absorption rate by the vortex method higher than that of the water absorbent resin disposed in the non-sealed portion of the central region of the lower absorbent layer. It is preferably 5 seconds or more, more preferably 10 seconds or more, and even more preferably 20 seconds or more.

  The water absorption rate of the water absorbent resin by the vortex method is measured according to JIS K 7224 (1996). Specifically, the water absorption speed is obtained as follows. A glass beaker with a capacity of 100 mL, 50 mL of physiological saline (0.9% by mass sodium chloride water) and a magnetic stirrer chip (center diameter 8 mm, both ends diameter 7 mm, length 30 mm, and surface coated with fluororesin The beaker is placed on a magnetic stirrer (HPS-100 manufactured by As One Co., Ltd.). The rotational speed of the magnetic stirrer is adjusted to 600 ± 60 rpm, and the physiological saline is stirred. Add 2.0 g of the water-absorbing resin into the liquid at the center of the vortex of the saline solution being stirred, and start counting when the water-absorbing resin has been introduced into the beaker. Stop the timing at the moment when it breaks (when the vortex disappears and the liquid surface becomes flat), and record the time (in seconds) as the water absorption rate. The measurement is performed 5 times (n = 5), the values at each of the upper and lower points are deleted, and the average value of the remaining three points is taken as the measured value. The measurement is performed at a temperature of 23 ± 2 ° C. and a relative humidity of 50 ± 5%, and the measurement is performed after holding the water absorbent resin in the same environment for 24 hours or more before the measurement.

From the viewpoint of increasing the absorption capacity of urine and the like in the upper absorption layer and increasing the diffusibility of urine and the like in the lower absorption layer, the amount of the water-absorbent resin disposed in the unsealed portion of the central region of the upper absorption layer (g / m ²⁾ it is also preferably configured to be larger than the amount of the water absorbent resin which is arranged in the non-sealing portion of the central region of the lower absorbent layer (g / m ^2). Since the sealing portion is formed in the central region of the upper absorbent layer, even if the amount of the water-absorbing resin disposed in the non-sealed portion of the central region of the upper absorbent layer is increased, in the plane direction of the upper absorbent layer Can be ensured. And the absorption capacity | capacitance of an upper side absorption layer can be raised by arrange | positioning many water absorbing resins to the non-sealing part of the center area | region of an upper side absorption layer. On the other hand, since the sealing portion is not formed in the central region of the lower absorbent layer, the lower absorbent layer can be reduced by reducing the amount of the water-absorbing resin disposed in the non-sealing portion of the central region of the lower absorbent layer. The diffusibility in the plane direction can be improved. In the lower absorbent layer, the sealing capacity is not provided in the central region, so that the absorption capacity of the entire lower absorbent layer is secured. In addition, by configuring the lower absorbent layer in this way, urine and the like are less likely to move to the non-skin surface side of the absorbent laminate, and in an absorbent article provided with the absorbent laminate, a backsheet such as urine Leakage from the side is less likely to occur.

In the upper absorbent layer, the water absorbent resin may be disposed also in the sealing portion in the central region. In this case, the amount of water absorbent resin (g / M ² ) is preferably smaller than the amount (g / m ² ) of the water-absorbing resin disposed in the non-sealing portion in the central region of the lower absorbent layer. Thereby, in the sealing part of the center area | region of an upper side absorption layer, while urine etc. become easy to spread | diffuse in a plane direction, it becomes easy to transfer to a lower side absorption layer through a sealing part.

From the viewpoint of increasing the absorption capacity of the upper absorbent layer, the amount of the water-absorbing resin disposed in the unsealed portion of the central region of the upper absorbent layer is preferably 200 g / m ² or more, more preferably 250 g / m ² or more. More preferably, it is 300 g / m ² or more. On the other hand, from the viewpoint of easily maintaining the sealing part even if the water absorbent resin arranged in the non-sealing part of the upper absorbent layer absorbs water, it is arranged in the non-sealing part in the central region of the upper absorbent layer. the amount of the water-absorbing resin is preferably 1000 g / m ² or less, more preferably ^{800g / m 2, 600g / m} 2 or less is more preferred.

From the viewpoint of increasing the absorption capacity of the lower absorbent layer, the amount of the water-absorbing resin disposed in the unsealed portion of the central region of the lower absorbent layer is preferably 70 g / m ² or more, more preferably 100 g / m ² or more. Preferably, 150 g / m ² or more is more preferable. On the other hand, from the viewpoint of ensuring the diffusibility of urine and the like in the lower absorbent layer and increasing the proportion of the water absorbent resin that effectively contributes to the absorption of urine and the like, it is disposed in the unsealed portion of the central region of the lower absorbent layer. the amount of the water absorbent resin to be is preferably 400 g / m ² or less, more preferably ^{350g / m 2, 300g / m} 2 or less is more preferred.

The amount of the water-absorbent resin disposed in the sealing portion in the central region of the upper absorbent layer is preferably 50 g / m ² or less from the viewpoint of ensuring diffusibility and permeability of urine and the like in the sealed portion of the upper absorbent layer. 40 g / m ² or less is more preferable, and 35 g / m ² or less is more preferable. On the other hand, the lower limit of the amount of the water absorbent resin disposed in the sealing portion in the central region of the upper absorbent layer is not particularly limited, and may be 0 g / m ² . Note that a small amount of water-absorbing resin may be disposed in the sealing portion in the central region of the upper absorbent layer as long as the permeability of urine or the like is ensured, whereby the absorption capacity of the upper absorbent layer. And the diffusibility of the upper absorbent layer in the planar direction can be enhanced. In this case, the lower limit of the amount of the water-absorbing resin disposed in the sealing portion in the central region of the upper absorbent layer is, for example, preferably 5 g / m ² or more, more preferably 10 g / m ² or more, and 15 g / m ² or more. Further preferred.

The amount of the water-absorbing resin described above represents the amount of the water-absorbing resin per unit area in the sealed portion or the non-sealed portion of the upper absorbent layer or the lower absorbent layer. The amount (g / m ² ) of the water absorbent resin in the non-sealing portion in the central region of the upper absorbent layer is the amount of the water absorbent resin disposed in all the non-sealed portions in the central region of the upper absorbent layer. It is obtained by dividing by the area of the non-sealing part in the central region of the absorption layer. The amount (g / m ² ) of the water absorbent resin in the non-sealing portion in the central region of the lower absorbent layer is the amount of the water absorbent resin disposed in the non-sealed portion in the central region of the lower absorbent layer. It is obtained by dividing by the area of the non-sealing portion in the central region of the side absorption layer. The amount (g / m ² ) of the water absorbent resin in the sealing portion in the central region of the upper absorbent layer is the amount of the water absorbent resin disposed in all the sealing portions in the central region of the upper absorbent layer. It is obtained by dividing by the area of the sealing portion in the central region.

  From the viewpoint of promptly absorbing urine and the like in the absorbent laminate, the upper absorbent layer is also preferably configured as follows. That is, in the upper absorbent layer, the basis weight of the sheet member disposed on the skin surface side is preferably larger than the basis weight of the sheet member disposed on the non-skin surface side. By forming the basis weight of the sheet member arranged on the skin surface side of the upper absorbent layer larger, the capillary effect by the sheet member can be further exerted. Therefore, urine etc. received by the absorbent laminate can be quickly drawn into the upper absorbent layer by the sheet member on the skin side of the upper absorbent layer, and as a result, quick absorption of urine etc. is realized. can do. Further, by configuring the upper absorbent layer in this way, when the absorbent laminate is touched from the skin surface side or when the absorbent article provided with the absorbent laminate is touched from the top sheet side, The rough feeling by the water absorbing resin of an absorption layer can be reduced.

  The lower absorbent layer may also be formed such that the basis weight of the sheet member disposed on the skin surface side is larger than the basis weight of the sheet member disposed on the non-skin surface side. Thereby, the urine etc. which permeate | transmitted the upper side absorption layer become easy to transfer to a lower side absorption layer rapidly.

  In the upper absorbent layer and the lower absorbent layer, the sheet member is preferably composed of a nonwoven fabric from the viewpoint of promptly drawing urine or the like into the sheet member. In particular, it is preferable to use an air-through nonwoven fabric or a spunlace nonwoven fabric as a sheet member as a nonwoven fabric that is formed to be relatively bulky and has an excellent pulling force such as urine.

  It is also preferable that the sheet | seat member comprised from the nonwoven fabric contains the heat-fusible fiber. Examples of the heat-fusible fiber include polyolefin fibers such as polyethylene and polypropylene, polyester fibers such as PET, and polyamide fibers such as nylon. If the sheet member is configured in this way, it becomes easy to weld the sheet members at the sealing portion, and even if the upper absorbent layer or the lower absorbent layer absorbs water, the sheet members can be joined together. It becomes easy to be maintained. In particular, the upper absorbent layer is composed of a nonwoven fabric in which the sheet member on the skin surface side and the non-skin surface side contains heat-fusible fibers from the viewpoint of ensuring diffusibility of urine etc. in the sealing portion in the central region. It is preferable.

  It is preferable that the nonwoven fabric containing the heat-fusible fiber is composed of fibers containing at least a polyethylene resin. The nonwoven fabric configured as described above can firmly join the sheet members by forming the sealing portion by heat sealing or ultrasonic welding. In addition, if the nonwoven fabric composed of fibers containing polyethylene resin is an air-through nonwoven fabric, adhesion between fibers can be firmly formed, for example, even if the upper absorbent layer or the lower absorbent layer absorbs water and swells, The sheet member is difficult to break.

  The fiber containing the polyethylene resin may have only polyethylene as the resin, and may further have another resin, but preferably has a polyethylene resin and a resin having a higher melting point than the polyethylene resin. . It is preferable to use a composite fiber such as a core-sheath structure or a side-by-side structure as the fiber composed of a plurality of resins, and the polyethylene resin is a component of the composite fiber (for example, a sheath component of a core-sheath structure or a side-by-side structure). It is preferable to constitute one component of the structure.

  Therefore, the sheet member of the upper absorbent layer and / or the lower absorbent layer is preferably made of an air-through nonwoven fabric composed of fibers containing polyethylene resin. In particular, the upper absorbent layer has a central region even if it absorbs water and swells. From the viewpoint of maintaining the sealing portion, it is preferably made of an air-through nonwoven fabric composed of fibers containing polyethylene resin.

  The upper absorbent layer may have only one layer structure configured so as to have a water-absorbent resin between the sheet members and have no pulp fiber, or may have a plurality of layers. In the latter case, it is preferable to stack a plurality of layers so that the sealing portions in the central region of the upper absorbent layer overlap each other.

  The lower absorbent layer may also have only one or a plurality of layer structures configured so as to have a water-absorbing resin between the sheet members and have no pulp fibers. Note that the lower absorbent layer does not have a sealing portion in the central region and is inferior in the vertical permeability of urine etc., so the lower absorbent layer has a water absorbent resin between the sheet members. It is preferable to have only one layer structure configured so as not to have pulp fibers.

  Next, the absorbent article of the present invention will be described. The absorbent article of the present invention is characterized in that the absorbent laminate of the present invention is provided, and the absorbent laminate of the present invention is disposed between the top sheet and the back sheet. Examples of the absorbent article include urine pads (including incontinence pads), disposable diapers, sanitary napkins and the like. The absorbent article of the present invention has excellent absorbent performance by providing the above-described absorbent laminate.

  The shape of the absorbent article is not particularly limited. When the absorbent article is, for example, a urine pad or a sanitary napkin, examples of the shape of the absorbent article include a rectangular shape, an hourglass shape, a gourd shape, and a battledore shape.

  When the absorbent article is a disposable diaper, the disposable diaper may be a tape-type disposable diaper provided with fastening members on both the left and right sides and formed into a pants shape when worn by the fastening member. And a pair of legged disposable diapers in which a pair of leg openings are formed. A pants-type disposable diaper is an absorbent main body in which the absorbent laminate of the present invention is disposed between a top sheet and a back sheet, and is attached to the skin side of an exterior member formed in a pants shape. May be.

  The top sheet is provided on the skin surface side of the absorbent laminate and is liquid permeable. The top sheet is provided so as to face the wearer's skin when the absorbent article is worn. Examples of the top sheet include nonwoven fabrics formed from hydrophilic fibers such as cellulose, rayon, and cotton; and hydrophobic properties such as polyolefin (for example, polypropylene and polyethylene), polyester (for example, PET), and polyamide (for example, nylon). A non-woven fabric formed from fibers, in which the surface of hydrophobic fibers is hydrophilized with a surfactant, can be used. As the top sheet, a woven fabric, a knitted fabric, or a plastic film in which holes are formed may be used.

  The back sheet is provided on the non-skin surface side of the absorbent laminate and is liquid impermeable. When the absorbent article is worn, the back sheet is provided so as to face the side opposite to the wearer, that is, the outside. As the back sheet, a non-woven fabric formed from hydrophobic fibers such as polyolefin (for example, polypropylene, polyethylene), polyester (for example, PET), polyamide (for example, nylon), a plastic film, or the like can be used. Moreover, you may use the laminated body of a nonwoven fabric and a plastic film.

  When the top sheet or the back sheet is composed of a nonwoven fabric, it is preferable to use a spunbond nonwoven fabric, an air-through nonwoven fabric, a point bond nonwoven fabric, a melt blown nonwoven fabric, an airlaid nonwoven fabric, an SMS nonwoven fabric, or the like.

  The absorbent article is preferably provided with rising flaps on both sides of the skin surface in the width direction. By providing the rising flap, side leakage of body fluid such as urine is prevented. For example, the rising flap is formed by joining side sheets extending in the longitudinal direction on both sides in the width direction of the top sheet, and providing an elastic member inward in the width direction of the side sheet (near the upper end when the rising flap rises). Is formed. By providing the side sheet and the elastic member in this manner, the inner side in the width direction of the side sheet rises toward the wearer's skin due to the contraction force of the elastic member, and a rising flap is formed. The rising flap or the side sheet is preferably composed of a liquid-impermeable plastic film, a liquid-impermeable nonwoven fabric, or the like.

  The absorbent article of the present invention will be described with reference to FIGS. 4 and 5 by taking a urine pad as an example. In addition, the absorbent article of this invention is not limited to the embodiment shown by drawing. 4 and 5 show an absorbent article including the absorbent laminate shown in FIGS. 1 to 3. 4 shows a plan view of the urine pad as an absorbent article as seen from the top sheet side, and FIG. 5 shows a VV cross-sectional view of the absorbent article shown in FIG.

  The absorbent article 1 includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and an absorbent laminate 10 provided therebetween. The top sheet 2 is disposed on the skin surface side of the absorbent laminate 10 and transmits body fluid such as urine. The body fluid that has passed through the top sheet 2 is accommodated in the absorbent laminate 10. The back sheet 3 is disposed on the non-skin surface side of the absorbent laminate 10, and prevents body fluid from leaking to the outside.

  The absorbent laminate 10 has an upper absorbent layer 11 and a lower absorbent layer 21 from the topsheet 2 side. The detailed configuration of the absorbent laminate 10 is as described above. For example, referring to FIG. 1, the upper absorbent layer 11 includes sealing portions 17 and 18 in which the sheet members 12 are joined to each other and a non-sealing portion 19 in which the sheet members 12 are not joined to each other in the width direction x. The sealing part 17 is formed in the edge part area | region of both sides, and the sealing part 18 and the non-sealing part 19 are formed in the center area | region between them. The lower absorbent layer 21 has a sealing portion 27 in which the sheet members 22 are joined together and a non-sealing portion 29 in which the sheet members 22 are not joined together, and is sealed in end regions on both sides in the width direction x. The part 27 is formed, the non-sealing part 29 is formed in the central region between them, and the sealing part is not formed. And the water absorption speed by the vortex method of the water absorbing resin arranged in the non-sealing part 19 in the central region of the upper absorbent layer 11 is the water absorbing property arranged in the non-sealing part 29 in the central region of the lower absorbent layer 21. It is faster than the water absorption rate by the resin vortex method. The absorbent article 1 exhibits excellent absorption performance for urine and the like by including the absorbent laminate 10 thus configured.

  It is preferable that an upper mount 4 be provided between the top sheet 2 and the absorbent laminate 10. Moreover, it is preferable that the lower mount 5 is provided between the back sheet 3 and the absorbent laminate 10. The upper mount 4 and the lower mount 5 are provided in order to improve the diffusibility of body fluids such as urine and to prevent the absorbent article 1 from being deformed. The upper mount 4 is preferably liquid permeable, and the lower mount 5 may be liquid permeable or liquid impermeable. As the upper mount 4 and the lower mount 5, tissue paper, crepe paper, or the like can be used.

  The absorbent article 1 is preferably provided with side sheets 6 extending in the longitudinal direction y on both sides of the top sheet 2 in the width direction x. The side sheets 6 are joined to both sides of the top sheet 2 in the width direction x. 4 and 5, the side seat 6 is provided with three standing elastic members 7 inward in the width direction x. When the absorbent article 1 is used, the inner side of the side seat 6 rises toward the wearer's skin due to the contraction force of the standing elastic member 7, thereby forming a rising flap to prevent lateral leakage of excrement such as urine. Is done.

1: Absorbent article 2: Top sheet 3: Back sheet 10: Absorbent laminate 11: Upper absorbent layer 21: Lower absorbent layer 12, 22: Sheet member 13, 23: Water absorbent resin 14, 24: Adhesive layer 15, 25: End region 16, 26: Central region 17, 18, 27: Sealed portion 19, 29: Non-sealed portion

Claims (8)

An absorbent laminate that is used to absorb body fluid and has a longitudinal direction and a width direction,
The absorbent laminate has an upper absorbent layer disposed on the skin surface side and a lower absorbent layer disposed on the non-skin surface side,
Each of the upper absorbent layer and the lower absorbent layer is configured to have a water-absorbing resin between the sheet members and have no pulp fiber, and the sheet member is joined to the sealing portion where the sheet members are joined. A non-sealing portion that is not, and a water-absorbing resin is disposed on the non-sealing portion,
Each of the upper absorbent layer and the lower absorbent layer has an end region on both sides in the width direction and a central region located therebetween,
The upper absorption layer has the sealing portion formed in the end region, the sealing portion and the non-sealing portion formed in the central region,
In the lower absorbent layer, the sealing portion is formed in the end region, the non-sealing portion is formed in the central region, and the sealing portion is not formed.
The water absorption rate by the vortex method of the water-absorbing resin disposed in the non-sealing portion of the central region of the upper absorbent layer is the vortex method of the water-absorbing resin disposed in the non-sealing portion of the central region of the lower absorbent layer. Absorbent laminate, characterized in that it is faster than the water absorption rate by.   The absorptive layered product according to claim 1 in which said non-sealing part is provided in the shape of a stripe prolonged in the longitudinal direction in said central field of said upper part absorption layer.   The absorptive laminated body according to claim 1 or 2 whose water absorption rate by the vortex method of water-absorbing resin arranged at the non-sealing part of the central field of said upper part absorption layer is 20 seconds or less. The amount (g / m ² ) of the water-absorbing resin disposed in the non-sealing portion in the central region of the upper absorbent layer is the amount of the water-absorbing resin disposed in the non-sealing portion in the central region of the lower absorbent layer. the absorbent laminate according to any one of more claims 1 to 3 than the amount (g / m ^2).   The absorptive layered product according to any one of claims 1 to 4 in which said sheet members are welded in said sealing part.   The absorptive laminate according to any one of claims 1 to 5, wherein the sheet member of the upper absorbent layer is formed of an air-through nonwoven fabric composed of fibers containing a polyethylene resin.   The absorption according to any one of claims 1 to 6, wherein the upper absorbent layer has a basis weight of the sheet member arranged on the skin side larger than a basis weight of the sheet member arranged on the non-skin side. Laminate. The absorbent laminate according to any one of claims 1 to 7,
A liquid-permeable top sheet provided on the skin side of the absorbent laminate;
An absorbent article comprising a liquid-impermeable back sheet provided on the non-skin surface side of the absorbent laminate.

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