JP2014068591A - Absorbent sheet for pet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent sheet for pets capable of acquiring a pH value of urine even when some time has elapsed from urination.SOLUTION: The absorbent sheet for pets includes a liquid permeable surface sheet, a liquid-impermeable back sheet, and an absorber both surfaces of which are wrapped by crepe paper, that is interposed between the surface sheet and the back sheet and includes a superabsorbent polymer. The absorbent sheet further includes a pH discrimination part on the crepe paper in the surface sheet side or on the surface sheet, the pH discrimination part being formed of functional ink that exerts a function by getting wet. The absorber located in a lower side of the pH discrimination part is formed with an area where no superabsorbent polymer is present.

Description

  The present invention relates to an absorbent sheet for pets.

  In recent years, the market for indoor dogs has expanded, and absorbent sheets for pets for absorbing urine excreted by pets such as dogs and cats have become widespread. Such an absorbent sheet for pets includes a liquid-permeable top sheet, a liquid-impervious back sheet, an absorbent body that is wrapped between crepe paper and interposed between the top sheet and the back sheet. A configuration including the above is known.

  Such an absorbent sheet for pets is formed of a special functional ink (for example, special ink including a pH indicator: hereinafter simply referred to as pH ink) so as to exhibit a function when wetted with urine. Absorptive sheet for pets that has a pH discriminating part (design, pattern, etc.) on part of the sheet and can simultaneously grasp the pH value of urine and the color of urine during urination by the color change reaction between animal urine and this pH ink Is realized (see, for example, Patent Document 1).

  In addition, as a sheet for grasping the pH value of urine of animals, etc., it is a sheet composed of a material to which pH ink is printed, applied, or impregnated, and by color change reaction between urine of animals and this pH ink. A sheet that can easily and easily find an animal disease has been realized (see, for example, Patent Document 2).

JP2012-050405A JP 10-313894 A

However, in the absorbent sheet for pets described in Patent Document 1, a sheet reflecting a pH value of urine immediately after urination is present, but a sheet in which a pH determination part is formed with pH ink over time, Since it dries under the influence of the highly water-absorbent resin (polymer) in the absorbent body, the color due to the discoloration reaction changes, resulting in a color different from the original pH value.
For this reason, when time passed since the time of urination, there existed a problem that the correct pH value could not be grasped | ascertained from the color which appeared on the absorbent sheet for pets.

  The subject of this invention is providing the absorptive sheet for pets which can grasp | ascertain the pH value of urine even when time has passed since the time of urination.

In order to solve the above-mentioned problem, the invention according to claim 1
A liquid-permeable top sheet, a liquid-impervious back sheet, and an absorbent body including a superabsorbent resin that is wrapped between crepe paper and interposed between the top sheet and the back sheet. In the pet absorbent sheet provided,
A pH discriminating unit formed of functional ink that exhibits a function by being wetted on the crepe paper on the top sheet side or on the top sheet;
A region where the superabsorbent resin does not exist is formed in the absorber located below the pH determination unit.

  A second aspect of the present invention is the pet absorbent sheet according to the first aspect, wherein the region is formed on at least an upper portion of the absorbent body positioned below the pH determination unit. .

  According to a third aspect of the present invention, in the pet absorbent sheet according to the first or second aspect, the pH discriminating unit is formed on the crepe paper on the top sheet side or aligned on the top sheet. The region is formed over the entire row in which the pH determination units are arranged.

  Invention of Claim 4 is the absorbent sheet for pets as described in any one of Claims 1-3, The emboss was given to the said absorber along the boundary of the said area | region at least. To do.

  The invention according to claim 5 is the absorbent sheet for pets according to claim 1, wherein the absorber located below the pH determination unit includes at least the upper absorbent body in which the superabsorbent resin does not exist and the absorber. It is characterized by comprising a lower absorbent body in which a superabsorbent resin exists uniformly.

  According to the present invention, the speed at which the crepe paper or the surface sheet on which the pH determination unit is formed dries over time due to the formation of the region where no polymer exists in the absorber located below the pH determination unit. Even when time has elapsed since urination, a color reflecting the pH value of urine can be exhibited, and the pH value of urine can be grasped.

It is a top view which shows an example of the absorbent sheet for pets of 1st Embodiment. It is a figure which shows an example of the II-II cross section of FIG. It is a top view which shows an example of the absorbent sheet for pets of 2nd Embodiment. It is a figure which shows an example of the IV-IV cross section of FIG. It is a top view which shows an example of the absorbent sheet for pets of 3rd Embodiment. It is a figure which shows an example of the VI-VI cross section of FIG. It is a top view which shows an example of the absorbent sheet for pets of the modification 1. It is a top view which shows an example of the absorbent sheet for pets of the modification 2.

  Hereinafter, the pet absorbent sheet according to an embodiment of the present invention will be described in detail with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.

(First embodiment)
The pet absorbent sheet according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  Absorbent sheet 100 for pets, as shown in FIG. 1, has a substantially rectangular shape. For example, the absorbent sheet 100 is used by laying on a floor or flooring of a pet toilet. Moisture is absorbed from the surface into the sheet. Moreover, the pH discriminating portion 1 is formed on the pet absorbent sheet 100 with pH ink.

  The pet absorbent sheet 100 includes a liquid-permeable top sheet that allows permeation of liquid such as urine, a liquid-impervious back sheet disposed on the back side of the top sheet, and a space between the top sheet and the back sheet. It is comprised including the absorber etc. which are interposed in.

The top sheet is formed of a perforated or non-porous nonwoven fabric, a porous plastic sheet, or the like. As a raw material fiber constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, recycled fibers such as rayon or cupra, and natural fibers such as cotton can be used. In addition, as a method for producing the nonwoven fabric, a known method can be used as appropriate, and examples thereof include a spunlace method, a spunbond method, a thermal bond method, a melt blow method, a needle punch method, or a combination of these methods. .
When a large number of through-holes are formed in the top sheet, liquid such as urine is absorbed more quickly, and the dry touch property is excellent.

  The back sheet is not particularly limited as long as it is a liquid-impervious material. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, or a laminate in which a plastic film is provided on the surface of a nonwoven fabric. A non-woven fabric, a laminated sheet in which a non-woven fabric or the like is bonded to a plastic film, and the like can be used. In addition, by applying heat and pressure to reduce the voids of the fiber, or by applying a highly water-absorbent resin or hydrophobic resin or water repellent, a sheet that is liquid-impervious without using a plastic film It can be used as a back sheet.

  At the periphery of the pet absorbent sheet 100, the top sheet and the back sheet are bonded together by a hot melt adhesive, heat seal, ultrasonic seal or the like.

The absorber absorbs a water-like component such as urine, and can be formed by, for example, an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening as necessary a synthetic fiber tow (fiber bundle) such as cellulose acetate, in addition to those obtained by stacking short fibers such as cotton-like pulp and synthetic fibers Can also be used.
Moreover, the said absorber contains a super absorbent polymer (SAP; Super Absorbent Polymer).

Examples of superabsorbent resins (hereinafter simply referred to as polymers) include carboxymethylcellulose, polyacrylic acid and its salts, crosslinked acrylate polymers, starch-acrylic acid graft copolymers, and starch-acrylonitrile graft copolymers. A hydrolyzate, a polyoxyethylene cross-linked product, a carboxymethyl cellulose cross-linked product, a partially cross-linked water-swellable polymer such as polyethylene oxide and polyacrylamide, or a copolymer of isobutylene and maleic acid is preferably used.
Furthermore, in order to give a deodorant function, you may put a deodorizer in an absorber. As the deodorant, for example, activated carbon, natural minerals (for example, bennite, kaolinite, kanemite, etc.) and synthetic inorganic substances (zeolite, amorphous silica, etc.) can be used.

  As shown in FIG. 2, the upper and lower surfaces of the absorbent body 2 containing pulp and polymer are wrapped with crepe paper 3 and 4, and the pH discriminating unit 5 is made of pH ink on the crepe paper 3 on the surface sheet 6 side. It is formed. The absorbent body 2 wrapped with the crepe papers 3 and 4 is interposed between the top sheet 6 and the back sheet 7.

  In addition, as shown in FIG. 2, an area AR <b> 1 where the polymer 8 does not exist is formed in the absorbent body 2 immediately below the crepe paper 3 in which the pH determination unit 5 is formed. In other words, a region AR1 in which the polymer 8 does not exist is formed from the upper layer to the lower layer of the absorbent body 2 immediately below the crepe paper 3 on which the pH determination unit 5 is formed.

  The manufacturing method of such a pet absorbent sheet 100, in particular, the manufacturing method of the area AR1 in the absorbent body 2 is as follows. That is, in the step of spraying the polymer 8 on the absorber 2, the region AR1 where the polymer 8 is not present in the absorber 2 is obtained by spraying the polymer 8 after masking the position where the pH determination unit 5 is formed. It is formed.

Here, the process of discriminating the pH of the urine when the pet urinates will be described. When the pet urinates on the pet absorbent sheet 100, the excreted urine passes through the top sheet 6 and the crepe paper 3 and is absorbed by the absorber 2.
At this time, the pH ink of the pH discriminating unit 5 formed on the crepe paper 3 comes into contact with the penetrating urine and changes color according to the pH of the excreted urine. And the pH value of urine can be grasped | ascertained by confirming the color which the pH discrimination | determination part 5 exhibits.

  On the other hand, since the area AR1 in which the polymer 8 does not exist is formed immediately below the crepe paper 3 on which the pH discriminating unit 5 is formed, urine moisture is less likely to be absorbed by the polymer 8 compared to other areas. The drying speed of the crepe paper 3 on which the pH determination unit 5 is formed becomes slow.

  That is, by forming the region AR1 in which the polymer 8 does not exist in the absorbent body 2 immediately below the crepe paper 3 on which the pH determination unit 5 is formed, the crepe paper 3 in the region becomes difficult to dry. The color change due to can be reduced.

  As described above, the region AR1 in which the polymer 8 does not exist is formed in the absorbent body 2 immediately below the crepe paper 3 on which the pH determination unit 5 is formed, so that the crepe paper 3 on which the pH determination unit 5 is formed is Since the drying speed becomes slower with the passage of time, a color reflecting the pH value of urine can be exhibited even when time has elapsed since urination, and the pH value of urine can be grasped.

(Second Embodiment)
The pet absorbent sheet according to the second embodiment of the present invention will be described with reference to FIGS.

  Absorbent sheet 101 for pets, as shown in FIG. 3, has a substantially rectangular shape. For example, the absorbent sheet 101 is used on a floor or flooring of a pet toilet, and excretions excreted by pets. Moisture is absorbed from the surface into the sheet. Moreover, the pH determination part 9 is formed in the pet absorbent sheet 101 with pH ink.

  As shown in FIG. 4, the upper and lower surfaces of the absorbent body 10 containing pulp and polymer are wrapped with crepe papers 11 and 12, and the pH discriminating unit 13 is made of pH ink on the crepe paper 11 on the top sheet 14 side. It is formed. The absorbent body 10 wrapped with the crepe papers 11 and 12 is interposed between the top sheet 14 and the back sheet 15.

  Further, as shown in FIG. 4, an area AR <b> 2 where the polymer 16 does not exist on the crepe paper 11 side is formed in the absorbent body 10 immediately below the crepe paper 11 in which the pH determination unit 13 is formed. In other words, a region AR2 in which the polymer 16 does not exist is formed in a part of the upper layer of the absorbent body 10 immediately below the crepe paper 11 on which the pH determination unit 13 is formed.

  However, unlike the first embodiment, the polymer 16 is present from the bottom surface of the area AR2 to the crepe paper 12 side in the absorber 10. In other words, in the absorbent body 10 immediately below the crepe paper 11 on which the pH discriminating unit 13 is formed, the amount of the polymer 16 sprayed is reduced compared to other regions.

  The manufacturing method of such a pet absorbent sheet 101, particularly the manufacturing method of the area AR2, is as follows. That is, in the step of spraying the polymer 16 on the absorber 10, the polymer 16 is uniformly sprayed as the first step, and the position where the pH determination unit 13 is formed is masked as the second step. By further dispersing 16, the polymer 16 exists in the lower layer in the absorber 10, and the region AR <b> 2 in which the polymer 16 does not exist is formed in a part of the upper layer of the absorber 10.

Here, the process of discriminating the pH of the urine when the pet urinates will be described. When the pet urinates on the pet absorbent sheet 101, the excreted urine passes through the top sheet 14 and the crepe paper 11 and is absorbed by the absorber 10.
At this time, the pH ink of the pH discrimination unit 13 formed on the crepe paper 11 comes into contact with the permeated urine and changes color according to the pH of the excreted urine. And the pH value of urine can be grasped | ascertained by confirming the color which the pH discrimination | determination part 13 exhibits.

  On the other hand, since the region AR2 in which the polymer 16 does not exist is formed immediately below the crepe paper 11 on which the pH determination unit 13 is formed, the urine moisture is less likely to be absorbed by the polymer 16 compared to other regions. The drying speed of the crepe paper 11 on which the pH determination unit 13 is formed becomes slow.

  That is, by forming the region AR2 in which the polymer 16 does not exist in the absorbent body 10 immediately below the crepe paper 11 on which the pH determination unit 13 is formed, the crepe paper 11 in the region becomes difficult to dry. The color change due to can be reduced.

  As described above, the region AR2 where the polymer 16 does not exist is formed in the absorbent body 10 immediately below the crepe paper 11 on which the pH determination unit 13 is formed, so that the time of the crepe paper 11 on which the pH determination unit 13 is formed. Since the drying speed becomes slower with the passage of time, a color reflecting the pH value of urine can be exhibited even when time has elapsed since urination, and the pH value of urine can be grasped.

(Third embodiment)
The pet absorbent sheet according to the third embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 5, the pet absorbent sheet 102 has a substantially rectangular shape. For example, the pet absorbent sheet 102 is used on a floor surface or flooring of a pet toilet. Moisture is absorbed from the surface into the sheet. Moreover, the pH determination part 17 is formed in the pet absorbent sheet 102 with pH ink.

  As shown in FIG. 6, the upper and lower surfaces of the absorber 18 containing pulp and polymer are wrapped with crepe paper 19 and 20, and the pH discriminating unit 21 is made of pH ink on the crepe paper 19 on the surface sheet 22 side. It is formed. The absorber 18 wrapped with the crepe papers 19 and 20 is interposed between the top sheet 22 and the back sheet 23.

  Further, as shown in FIG. 6, the absorber 18 is composed of an upper layer absorber 181 and a lower layer absorber 182, the polymer 24 is not present in the upper layer absorber 181, and the polymer 24 is present in the lower layer absorber 182. Exists uniformly.

  In other words, a configuration in which the amount of the polymer 24 sprayed corresponding to the configuration of the polymer present in the area AR2 and its lower layer in the second embodiment is small is formed over the entire absorber 18.

  The manufacturing method of such an absorbent sheet 102 for pets, especially the manufacturing method of the absorber 18 is as follows. That is, in the step of spraying the polymer 24 on the absorbent body 18, as the first step, the polymer 24 is sprayed uniformly, and as the second step, only the paper cotton is sprayed, so that the upper layer absorbent body 181 has a polymer. 24, the absorber 18 in which the polymer 24 exists uniformly is formed in the lower layer absorber 182.

Alternatively, the upper layer absorber 181 in which the polymer 24 does not exist is manufactured in the first step, the lower layer absorber 182 in which the polymer 24 exists uniformly in the second step, and the upper layer absorber 181 in the third step. Then, the absorber 18 is formed by overlapping the lower layer absorber 182.
Of course, in this case, the order of the first step and the second step may be switched.

Here, the process of discriminating the pH of the urine when the pet urinates will be described. When the pet urinates on the pet absorbent sheet 102, the excreted urine passes through the top sheet 22 and the crepe paper 19 and is absorbed by the absorber 18.
At this time, the pH ink of the pH discriminating unit 21 formed on the crepe paper 19 comes into contact with the penetrating urine and changes color according to the pH of the excreted urine. And the pH value of urine can be grasped | ascertained by confirming the color which the pH discrimination | determination part 21 exhibits.

  On the other hand, immediately below the crepe paper 19 on which the pH discriminating unit 21 is formed, there is an absorber 18 composed of an upper layer absorber 181 in which the polymer 24 does not exist and a lower layer absorber 182 in which the polymer 24 exists uniformly. Therefore, the moisture of urine is not directly absorbed by the polymer 24 over the entire absorbent body 18, so that the drying speed is slowed over the entire crepe paper 19.

  That is, since the absorber 18 is composed of the upper layer absorber 181 in which the polymer 24 does not exist and the lower layer absorber 182 in which the polymer 24 exists uniformly, the crepe paper 19 is difficult to dry over the entire region. The change in color due to drying of the crepe paper 18 can be reduced.

  As described above, the crepe paper 19 in which the pH discriminating portion 21 is formed by configuring the absorber 18 from the upper layer absorber 181 in which the polymer 24 does not exist and the lower layer absorber 182 in which the polymer 24 exists uniformly. As the time elapses, the drying speed becomes slow, and even when time elapses from the time of urination, a color reflecting the pH value of urine can be exhibited, and the pH value of urine can be grasped.

(Modification 1)
Modification 1 of the first to third embodiments of the present invention will be described with reference to FIG.
FIG. 7 is a plan view showing an example of the pet absorbent sheet according to the first modified example. The absorbent body (not shown) directly below the crepe paper (not shown) on which the pH determining unit 25 of the pet absorbent sheet is formed. Rather than forming the above-mentioned area AR1 and area AR2, the above-mentioned area AR1 and area AR2 are formed over the entire rows CM1 and CM2 in which the pH discriminators 25 are arranged.
Alternatively, in the third embodiment, the upper layer absorber 181 in which the polymer 24 does not exist and the lower layer absorber 182 in which the polymer 24 exists uniformly are formed over the entire rows CM1 and CM2 in which the pH determination units 25 are arranged. The absorber 18 to be formed is formed.
However, the polymer is uniformly applied from the upper layer to the lower layer in regions other than the column CM1 and the column CM2 where the pH determination units 25 are arranged.

  As described above, according to the first modification, in particular, according to the first modification of the first and second embodiments, in the manufacturing process of the absorbent body, it is only necessary to perform masking for each column where the pH determination units 25 are arranged. , It is not necessary to mask each position where the pH determination part is formed, and the process can be simplified.

(Modification 2)
Modification 2 of the first to third embodiments of the present invention will be described with reference to FIG.
FIG. 8 is a plan view showing an example of the pet absorbent sheet according to the modified example 2, and the pH determining unit 25 of the pet absorbent sheet is regularly arranged as in the first to third embodiments. Instead of being arranged at random (arbitrary position).
Further, the above-mentioned region AR1 and region AR2 are formed in the absorbent body (not shown) immediately below the crepe paper (not shown) in which the pH discrimination unit 25 is formed, or the polymer in the third embodiment. Thus, an absorber 18 composed of an upper layer absorber 181 in which 24 is not present and a lower layer absorber 182 in which the polymer 24 is uniformly present is formed.

  As described above, according to the modified example 2, in particular, according to the modified example 2 of the third embodiment, the absorber is formed with a region where no polymer is present at an arbitrary position. Even if it is placed at (arbitrary position), there will always be a region under which the polymer does not exist, and random (arbitrary position) placement of the pH discrimination unit 25 is possible without adding a special process. become.

  In the description of the first embodiment to the third embodiment, etc., it is described that the pH determination unit is formed with pH ink on the crepe paper on the top sheet side, but the pH determination is performed with pH ink on the top sheet. Of course, it does not matter if the part is formed. Further, a liquid transfer sheet may be disposed between the crepe paper and the top sheet, and the pH determination unit may be formed with pH ink on the liquid transfer sheet.

  In the first embodiment and the second embodiment, even if the area AR1 and the area AR2 are formed in the absorber, the dispersed polymer is used during the manufacturing process, the distribution process, the storage process in the warehouse, and the actual use. It is also possible that the region AR1 and the region AR2 disappear due to the movement of the polymer, and therefore it is also effective to prevent the movement of the polymer by embossing the absorber and finely dividing the absorber into a plurality of regions. . Specifically, it is desirable that the embossing is processed at least along the boundary between the area AR1 and the area AR2 formed in the absorber.

  In addition, the surface sheet is exemplified as a perforated or non-porous nonwoven fabric or a porous plastic sheet, but any mesh sheet or the like having liquid permeability that allows liquid such as urine to permeate quickly can be used. It may be a simple material.

  Further, the back sheet is not particularly limited as long as it is a liquid-impervious material, and may be either a breathable material or a non-ventilated material. Absent.

  Further, the absorbent body may be composed of a mixture of pulp and polymer, or a layered laminate, and may have a layer in which no polymer exists.

  Moreover, it is of course possible to improve the deodorizing property or improve the antibacterial property by appropriately using a deodorizing agent, an antibacterial agent or the like for the pet absorbent sheet.

1, 5, 9, 13, 17, 21, 25 pH discriminator 2, 10, 18 Absorber 3, 4, 11, 12, 19, 20 Crepe paper 6, 14, 22 Top sheet 7, 15, 23 Back sheet 8, 16, 24 Polymer (High water absorption resin)
181 Upper layer absorber 182 Lower layer absorber 100, 101, 102 Water absorbent sheet AR1, AR2 area CM1, CM2 row for pet

Claims (5)

A liquid-permeable top sheet, a liquid-impervious back sheet, and an absorbent body including a superabsorbent resin that is wrapped between crepe paper and interposed between the top sheet and the back sheet. In the pet absorbent sheet provided,
A pH discriminating unit formed of functional ink that exhibits a function by being wetted on the crepe paper on the top sheet side or on the top sheet;
An absorbent sheet for pets, wherein a region where the superabsorbent resin does not exist is formed in the absorbent body located below the pH determination unit.   2. The pet absorbent sheet according to claim 1, wherein the region is formed on at least an upper portion of the absorbent body positioned below the pH determination unit. The pH determination unit is formed on the crepe paper on the top sheet side or aligned on the top sheet,
The absorbent sheet for pets according to claim 1 or 2, wherein the region is formed over the entire row in which the pH determination units are arranged.   The pet absorbent sheet according to any one of claims 1 to 3, wherein the absorbent body is embossed at least along a boundary of the region.   The absorber located on the lower side of the pH discriminating section is composed of at least an upper layer absorber in which the superabsorbent resin does not exist and a lower layer absorber in which the superabsorbent resin exists uniformly. The pet absorbent sheet according to claim 1.

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