JP2009232684A - Excrement-absorbing sheet for pet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excrement-absorbing sheet for pets, which is excellent in a urine-holding force and an absorption rate, a little turns back urine, and can sanitarily be used for a long period. <P>SOLUTION: The excrement-absorbing sheet 10 for the pets, having a liquid-permeable front side sheet 11, a liquid-impermeable back side sheet 12, and an absorbent 12 disposed between them, is characterized in that: the absorbent 12 has an upper layer and a lower layer; the upper layer includes a mixture of a fibrous absorbent 20 and a water-absorbing resin B; the lower layer includes a fibrous absorbent 21 and a water-absorbing resin A; and the liquid-absorbing rate of the water-absorbing resin A used for the lower layer is larger than that of the water-absorbing resin B used for the upper layer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pet excreta absorbent sheet.

In recent years, pets such as dogs and cats are like families, and people and pets often live in the same space. 2. Description of the Related Art A sheet-type pet excreta absorbing sheet is known as a urine processing molded product for pets kept indoors. The excreta absorbing sheet for pets has a liquid permeable top sheet, an absorbent body, and a liquid-impermeable back sheet in order from the top, so that pet urine can be retained in the absorbent body.
Conventionally, the excrement absorbing sheet for pets has a weak excrement holding power and the urine tends to reverse, so that the excrement absorbing sheet for pets has to be replaced each time. Moreover, in addition to the weak holding power, the absorption rate is slow, and there is a risk that the pet's foot may get wet during urination, which tends to be unsanitary.
In recent years, the number of working households has increased, and it is difficult to replace the pet excrement absorbing sheet each time, and there is a need for a sanitary pet excreta absorbing sheet that can be installed for a long time.

In order to improve urine retention and absorption speed, there is a method of adding a water-absorbing resin to a pet excreta absorption sheet. When a large amount of water-absorbing resin is used, the amount of urine retained increases. However, the water-absorbent resin swollen by urine tends to form a lump when it is dense. This becomes a barrier and causes blocking that prevents urine absorption. Accordingly, there has been a problem in that a large amount of urine cannot be absorbed simply by increasing the amount of the water-absorbing resin, and the absorption rate becomes slower with time.
Therefore, Patent Document 1 discloses a pet excreta absorbent sheet having a three-layered absorbent structure and laminated in the order of a water absorbent resin layer, a fibrous absorbent layer, and a water absorbent resin layer from the top sheet side. Yes.
Moreover, in patent document 2, the excrement absorption sheet | seat for pets which makes an absorber a four-layer structure and has two water-absorbing resin layers between two fibrous absorber layers is disclosed.

The excreta absorbent sheet for pets disclosed in Patent Documents 1 and 2 makes it easy to shift urine to the back sheet side by preventing the blocking by making the water absorbent resin layer into two layers of different water absorbent resins. Trying to improve urine retention and absorption speed.
However, the layer formed only from the water-absorbent resin tends to swell and become a lump and tends to cause blocking. Therefore, the retention and absorption speed of urine are not sufficient, and it has not been possible to prevent urine from reversing for a long time.
Therefore, in Patent Document 3, the absorbent body has a two-layer structure, and from the surface sheet side, the water-absorbing resin layer whose surface is crosslinked, and the fibrous absorbent body and the non-crosslinked water-absorbing resin are mixed in this order. A laminated excreta absorbent sheet for pets is disclosed.
Japanese Patent Laid-Open No. 11-332413 Japanese Patent Laid-Open No. 2005-6604 JP 2005-198598 A

The excreta absorbent sheet for pets disclosed in Patent Document 3 prevents the swelling by cross-linking the surface of the water absorbent resin used for the water absorbent resin layer on the top sheet side. It was not something that could be prevented.
Further, the pet excreta absorbing sheet has an effect of preventing urine diffusion.
However, if diffusion of urine is prevented, only a part of the absorber is used when excreted at the same place, and there is a problem that it cannot be used for a long time.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pet excreta absorbent sheet that is excellent in urine retention and absorption speed, has little urine reversal, and can be used hygienically for a long time.

  The pet excreta absorption sheet of the present invention has a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body provided therebetween, and the absorbent body is an upper layer and a lower layer 2. The upper layer is made of a mixture of the fibrous absorber and the water absorbent resin B, the lower layer is made of a mixture of the fibrous absorber and the water absorbent resin A, and the lower layer is made of the water absorbent resin B used for the upper layer. The water-absorbing resin A to be used is characterized in that the liquid absorption rate is faster.

In the pet excreta absorbent sheet of the present invention, the mass ratio of the water absorbent resin B to the water absorbent resin A (water absorbent resin B / water absorbent resin A) contained in the absorber is 7/3 to 1/9. Is preferable.
The pet excreta absorbing sheet of the present invention preferably has a liquid diffusable sheet between the upper layer and the lower layer.

The pet excreta absorbing sheet of the present invention preferably contains a deodorant between the top sheet and the back sheet.
The pet excreta absorbing sheet of the present invention preferably has the deodorant between the lower layer and the top sheet.

  The excreta absorbing sheet for pets of the present invention is excellent in urine retention and absorption speed, has little urinary reversal, and can be used hygienically for a long time.

Hereinafter, the present invention will be described in detail.
The pet excreta absorption sheet of the present invention has a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body provided between them, and the absorbent body is an upper layer and a lower layer 2. Having a layer.

[Surface sheet]
If the surface sheet is liquid permeable, even if the structure is a one-layer structure made of thin paper or non-woven fabric, a two-layer structure in which a resin film having a large number of liquid-permeable holes is laminated on the thin paper or non-woven fabric. It may be a structure.
Nonwoven fabrics include spunlace nonwoven fabrics made of cellulose fibers such as pulp and rayon, spunlace nonwoven fabrics made of cellulose fibers and hydrophilic synthetic resin fibers, and hydrophilically treated heat-fusible fabrics. Examples thereof include an air-through non-woven fabric formed of synthetic resin fibers, a point bond non-woven fabric formed of hydrophilic heat-sealable synthetic resin fibers, and a hydrophilic spunbond non-woven fabric. Furthermore, a composite nonwoven fabric obtained by laminating microfibers to a spunbond nonwoven fabric, specifically, a three-layer composite nonwoven fabric such as a meltblown nonwoven fabric, a spunbond nonwoven fabric, or a meltblown nonwoven fabric can be used.
As the resin film, it is preferable to use a white perforated film made of a thermoplastic resin such as a polyolefin such as polyethylene or polypropylene, a polyester such as polyethylene terephthalate, or a vinyl polymer such as polyvinyl chloride.

  The thickness of the top sheet is preferably 10 to 1000 μm, and more preferably 15 to 900 μm. If the thickness of the surface sheet is 10 μm or more, the strength is maintained to the extent that it is difficult to tear even if the pet scratches when used, and if it is 1000 μm or less, it can be easily folded and packed in various forms Is possible.

[Back sheet]
The back sheet is liquid impermeable to prevent urine leakage. The back sheet is preferably formed of a resin film such as polyethylene, polyethylene (PE) polypropylene, polyethylene terephthalate, or a water-repellent or hydrophobic nonwoven fabric. This nonwoven fabric is a melt blown nonwoven fabric or a spunbond nonwoven fabric, or a laminated nonwoven fabric in which a meltblown nonwoven fabric and a spunbond nonwoven fabric are laminated.
The thickness of the back sheet is preferably 15 to 30 μm, and more preferably 20 to 25 μm. If the thickness of the back sheet is 15 μm or more, it is strong enough to be torn during use and disposal, and if it is 30 μm or less, it can be easily folded and packed in various forms. is there.

〔Absorber〕
The absorbent according to the pet excreta absorbent sheet of the present invention has two layers, an upper layer and a lower layer, the upper layer is composed of a mixture of the fibrous absorbent and the water absorbent resin B, and the lower layer is the fibrous absorbent and the water absorbent. The water-absorbing resin A used for the lower layer has a higher liquid absorption rate than the water-absorbing resin B used for the upper layer.

(Fibrous absorber)
Examples of the fibrous absorber used in the upper layer and the lower layer include cotton-like pulp, broken wood pulp, sawdust and the like. In particular, it is preferable to use cotton-like pulp because of urine retention and ease of processing.
The amount of the fibrous absorber, preferably the basis weight is 50 to 1000 g / ^{m 2,} more preferable to be 60~1000g / ^{m 2,} further preferably a 70~1000g / ^{m 2.}
If the basis weight is 50 g / m ² or more, sufficient retention of urine is obtained, and if it is 1000 g / m ² or less, the texture is improved.

(Water absorbent resin)
Examples of the water absorbent resin B and the water absorbent resin A used in the upper layer and the lower layer include starch-based, cellulose-based, and synthetic polymer-based water-absorbent resins. In particular, a sodium polyacrylate type is preferable from the viewpoint of urine retention and absorption rate.
The amount of the water-absorbent resin used is preferably 10 to 80 parts by mass, more preferably 15 to 75 parts by mass, and more preferably 20 to 70 parts by mass with respect to 100 parts by mass of the dry mass of the fibrous absorber. Part is particularly preferred.
When the dry mass of the water absorbent resin is 10 parts by mass or more of the dry mass of the fibrous absorbent body, sufficient retention of urine can be obtained, and when the dry mass is 80 parts by mass or less, the texture is improved.

The absorption rate of the water absorbent resin B is preferably 20 to 60 seconds, and more preferably 25 to 60 seconds. If the water absorption rate is 60 seconds or less, the absorption rate is too slow, and it is difficult for urine to stick to the body of the pet during urination. Moreover, if it is 20 seconds or more, it will have time for urine to reach the lower layer.
The absorption rate of the water absorbent resin A is preferably 1 to 50 seconds, and more preferably 5 to 40 seconds. If the water absorption rate is 50 seconds or less, the absorption rate is too slow and excessive urine remains in the upper layer. Moreover, if it is 1 second or more, urine can be permeated without blocking.

In the absorbent body according to the excrement absorbent sheet for pets of the present invention, the absorption rate of the water absorbent resin A used for the lower layer is faster than the absorption rate of the water absorbent resin B used for the upper layer.
At this time, the difference between the absorption rate of the water absorbent resin A used for the lower layer and the absorption rate of the water absorbent resin B used for the upper layer is preferably 3 seconds or more, and more preferably 5 seconds or more. The upper limit value of the difference is preferably within 30 seconds.
If the difference in absorption speed is 3 seconds or more, urine tends to be hardly absorbed in the upper layer, and urine is absorbed in the lower layer, so that the effect of preventing reversion can be exhibited. If the difference in absorption rate is within 30 seconds, the absorption rate is too slow, and it is difficult for urine to stick to the body of the pet during urination.

In the absorbent body according to the pet excreta absorbent sheet of the present invention, the mass ratio (water absorbent resin B / water absorbent resin A) of the water absorbent resin B and the water absorbent resin A contained in the absorbent body is 7/3. Is preferably 1/9, and more preferably 7/4 to 5/8.
If the mass ratio is 7/3 or less, the upper layer is too thick and urine is not absorbed before reaching the lower layer, and if it is 1/9 or more, urine remains in the upper layer. Reversal can be suppressed.

(Liquid diffusion sheet)
The pet excreta absorbing sheet of the present invention preferably has a liquid diffusable sheet between the upper layer and the lower layer of the absorbent body having two layers of the upper layer and the lower layer.
The liquid diffusive sheet is used to diffuse urine and distribute it throughout the pet excreta absorbing sheet.
As the liquid diffusive sheet, it is preferable to use thin paper, tissue, diffusion paper, crepe paper, water-absorbing paper, hydrophilic nonwoven fabric, or the like, and among them, it is particularly preferable to use thin paper or tissue because it is inexpensive.

(Deodorants)
The pet excreta absorbing sheet of the present invention is preferably provided with a deodorant between the top sheet and the back sheet. In particular, when the deodorant is disposed between the lower layer of the absorber and the top sheet, the deodorant reliably comes into contact with urine, which is preferable because a continuous deodorizing effect is obtained.

Examples of the deodorant include a fragrance component, a deodorant component, and an antibacterial component.
A fragrance | flavor component is a component which volatilizes from a surface sheet at the time of use, gives a fragrance effect, and can also anticipate the deodorizing effect which suppresses spreading | diffusion of odors, such as an ammonia smell.
Specifically, alcohols such as geraniol, citronellol, citral, eugenol, phenethyl alcohol, thymol, linalool, green leaf alcohol, menthol, benzyl alcohol, aldehydes such as hexylcinnamon aldehyde, or galaxolide, etc. may be mentioned. It is preferable to use one or more of them.

The deodorant component is a component having a function of decomposing various malodor components.
Specifically, catechin, tannin, flavonoid, polyphenol, hinokitiol, flavangenol, laurel oil, sage oil, ginger oil, peppermint essential oil, or any one of these containing one selected is used. It is preferred if

The antibacterial component is a component having antibacterial properties capable of killing germs contained in urine, feces and the like.
Specifically, a cationic surfactant or an amphoteric surfactant can be used. As the cationic surfactant, for example, benzalkonium chloride, dialkyldimethylammonium chloride, alkyltrimethylammonium chloride, cetylpyridinium chloride and the like are used. As the amphoteric surfactant, for example, alkyldimethylamine oxide, alkyldiaminoethylglycine hydrochloride, alkyldimethylaminoacetic acid betaine, alkylcarboxymethylhydroxyethyl imidazolinium betaine, alkylamidopropyl betaine and the like are used.
Among them, it is particularly preferable to use a cationic surfactant from the viewpoint of deodorizing property and coloring prevention property, and among them, benzalkonium chloride is preferable from the viewpoint of antibacterial effect.

  As a method for blending these deodorants, there are methods such as granulation, spraying, dropping, transfer and the like, and it is preferable to select appropriately according to the form of the deodorant.

[Pet waste absorption sheet]
An example of the pet excreta absorbing sheet of the present invention is shown in FIG.
A pet excreta absorbing sheet 10 shown in FIG. 1 includes a liquid-permeable top sheet 11, a liquid-impermeable back sheet 13, and an absorbent body 12 provided therebetween. The absorbent body has two layers of an upper layer 16 and a lower layer 17, the upper layer is made of a mixture of the fibrous absorbent body 20 and the water absorbent resin B 19, and the lower layer 17 is a mixture of the fibrous absorbent body 21 and the water absorbent resin A 22. Consists of. Further, when the surface sheet further has two layers, it is preferable to use the resin film 14 and the thin paper or nonwoven fabric 15 in an overlapping manner. Further, it is preferable to dispose the liquid diffusive sheet 18 between the upper layer 16 and the lower layer 17, and the deodorant may be transferred to the liquid diffusable sheet 18.

  In order to obtain the excrement absorbing sheet for pets of the present invention, for example, first, a mixture of the fibrous absorbent body 21 and the water absorbent resin A22 is stacked on the thin paper 23, and the liquid diffusibility is further formed thereon. Place the sheet 18. Next, a mixture of the fibrous absorbent body 20 and the water absorbent resin B19 is stacked on the liquid diffusive sheet 18, and the thin paper 15 is placed thereon. Further, the back sheet 13 is disposed under the thin paper 23, the edges of the back sheet 13 and the thin paper 23 are folded back, the resin film 14 is placed thereon, and glue, hot melt adhesive, heat fusion, or the like is used. The surrounding area is adhered to form a pet excreta absorbing sheet.

According to the excrement absorbent sheet for pets of the present invention, since the absorbent body is a mixture of the water absorbent resin and the fibrous absorbent body, the water absorbent resin is arranged separately in the absorbent body and swells. However, blocking is less likely to occur, the urine retention is improved, and it can be used for a long time.
Moreover, since the absorption rate of the water absorbent resin A used for the lower layer is faster than the water absorbent resin B used for the upper layer, urine is retained from the lower layer side of the absorber, and maintains the absorption rate even after long-term use, In addition, urine reversion was prevented.
Furthermore, by arranging a liquid diffusable sheet between the upper layer and the lower layer of the absorber, it becomes possible to diffuse urine in the excreta absorbent sheet for pets. Therefore, even if the same place is used, urine spreads to other parts, and long-term use is possible. In addition, since the liquid diffusive sheet is disposed within the pet excreta absorbing sheet, it is possible to prevent the urine from being reversed during use.
In addition, since a deodorant is used in the pet excreta absorbent sheet, it can be used more hygienically for a long time.

Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited thereto.
Moreover, the measurement and evaluation of various physical properties in each example and comparative example are based on the following methods.

[Absorption rate]
40 mL of 1 mass% NaCl aqueous solution is injected into the center of the sample using a 50 mL graduated cylinder over 10 seconds. After injection, the number of seconds until the 1 mass% NaCl aqueous solution is absorbed in the sample and no longer exists on the sample surface is measured. The water absorption rate was used.
The measurement was made 5 times every 1 hour, and after 1 day, it was measured again 5 times every 1 hour and measured 10 times in total, and the following evaluation was performed.
<Evaluation criteria> ○ or higher is acceptable range ◎: Water absorption rate is less than 1 second until the 10th time ◎: Water absorption rate is 1 second or more and less than 3 seconds until the 10th time ○: Water absorption rate is 1 second or more and less than 3 seconds until the 10th time △ : Water absorption rate is 3 seconds or more after the 7th time ×: Water absorption rate is 3 seconds or more after the 5th time

[Reversibility]
Into the center of the sample, 40 mL of a 1 mass% NaCl aqueous solution was injected over 10 seconds using a 50 mL graduated cylinder, and this was repeated 5 times every hour. One day later, 5 injections were made again. When the total injection amount reached 400 mL, 10 sheets of pre-weighed filter paper (ADVANTEC 5Aφ11 cm) were placed on the center of the sample, and a 2 kg weight was placed on top of it for 5 seconds for 3 seconds. A range of × 5 × πcm ² was pressurized. The weight of the filter paper after pressurization was measured, and the increase amount was regarded as the liquid return amount, and the following evaluation was performed.
<Evaluation Criteria> ○ or higher is acceptable range ◎: Reversal amount is less than 10 g until the 10th time ◎: Reversal amount is less than 10 g until the 7th time ○: Reversal amount is less than 10 g until the 5th time △: Reversal amount is less than 5 times and 10 g ×: Reversal amount is 10g or more at the first time

[Water absorption speed of water absorbent resin]
First, 50 g of 0.9 mass% NaCl aqueous solution was put into a 100 mL beaker. A stirrer chip was placed in the beaker and rotated at 600 rpm, and it was confirmed that the aqueous solution generated vortices. While rotating the aqueous solution, 2 g of the water-absorbing resin was put into a beaker, and the time taken for the vortex of the aqueous solution to disappear and the liquid surface to become horizontal was measured to obtain the absorption rate.

In the following Examples and Comparative Examples, the following water-absorbing resins were prepared for the absorber.
Water-absorbing resin A: Acrylic acid polymer partial sodium salt crosslinked product (water absorption rate: 36 seconds, water absorption amount: 66 g / g, average particle size: 368 μm)
Water-absorbing resin B: Acrylic acid polymer partial sodium salt crosslinked product (water absorption rate: 42 seconds, water absorption amount: 57 g / g, average particle size: 369 μm)

[Example 1]
As a lower layer, 15 g of fibrous absorbent (cotton pulp, NBKP: conifer) and 4.5 g of water-absorbent resin A were mixed, and the stirred mixture was spread to 30 × 40 cm ² . Next, thin paper (basis weight 15 g / m ² ) 30 × 40 cm ² was placed on the lower layer as a liquid diffusive sheet. Further, as an upper layer, 15 g of fibrous absorbent (cotton pulp, NBKP: conifer) and 5.5 g of water-absorbing resin B were mixed, and the stirred mixture was made 30 × 40 cm ² and placed on the liquid diffusive sheet. Further, a thin paper (basis weight 15 g / m ² ) 30 × 40 cm ² was placed thereon as a surface sheet, and each evaluation was performed. The results are shown in Table 1.

[Example 2]
Samples were molded and evaluated in the same manner as in Example 1 except that the mass of the water absorbent resin A was 4 g and the mass of the water absorbent resin B was 6 g. The results are shown in Table 1.

Example 3
Samples were molded and evaluated in the same manner as in Example 1 except that the mass of the water absorbent resin A was 1 g and the mass of the water absorbent resin B was 9 g. The results are shown in Table 1.

Example 4
Samples were molded and evaluated in the same manner as in Example 1 except that the mass of the water absorbent resin A was 5 g and the mass of the water absorbent resin B was 5 g. The results are shown in Table 1.

Example 5
Samples were molded and evaluated in the same manner as in Example 1 except that the mass of the water absorbent resin A was 7 g and the mass of the water absorbent resin B was 3 g. The results are shown in Table 1.

Example 6
A sample was molded and evaluated in the same manner as in Example 1 except that the liquid diffusive sheet was not used. The results are shown in Table 1.

As shown in Table 1, in the samples molded in Examples 1 to 6, both the upper layer and the lower layer of the absorber are a mixture of a fibrous absorber and a water absorbent resin, and the water absorbent resin used for the lower layer Since the water absorption rate of A was faster than that of the water absorbent resin B used for the upper layer, a sample that maintained the absorption rate and had little reversal even when measured over a long period of time was obtained.
Among them, Examples 1, 2 and 4 in which the mass ratio of the water absorbent resin B to the water absorbent resin A (water absorbent resin B / water absorbent resin A) is in the range of 7/4 to 5/8 have good results. Has been obtained.
Moreover, when Example 1 and Example 6 which differ only in the presence or absence of a liquid diffusable sheet are compared, Example 1 which has sandwiched the liquid diffusible sheet between the upper layer and the lower layer repeatedly tested from the same place. Even when the test was performed, the liquid diffused inside and long-term measurement was possible. On the other hand, in Example 6 in which the liquid diffusive sheet was not used, the liquid did not spread within the sample, and a tendency to reverse somewhat was observed.

[Comparative Example 1]
The water absorbent resin B and the water absorbent resin B used in the upper layer were not mixed, and the water absorbent resin B was placed on the fibrous absorbent body (the same cotton-like pulp as in Example 1 having a basis weight of 125 g / m ² ). Samples were molded and evaluated in the same manner as in Example 2 except that the particles were dispersed. The results are shown in Table 2.

[Comparative Example 2]
The water absorbent resin A was not mixed with the fibrous absorbent body used for the lower layer and the water absorbent resin A on the fibrous absorbent body (the same cotton-like pulp as in Example 1 having a basis weight of 125 g / m ² ). Samples were molded and evaluated in the same manner as in Example 2 except that the particles were dispersed. The results are shown in Table 2.

[Comparative Example 3]
The water absorbent resin B and the water absorbent resin B used in the upper layer were not mixed, and the water absorbent resin B was placed on the fibrous absorbent body (the same cotton-like pulp as in Example 1 having a basis weight of 125 g / m ² ). On the fibrous absorbent (cotton pulp similar to Example 1 having a basis weight of 125 g / m ² ) without being mixed and further mixing the fibrous absorbent used in the lower layer and the water absorbent resin A. A sample was molded in the same manner as in Example 2 except that the water-absorbent resin A was dispersed, and each evaluation was performed. The results are shown in Table 2.

[Comparative Example 4]
The same as in Example 1 except that a mixture of the fibrous absorbent body 15g and the water absorbent resin A4g was used as the upper layer, and a mixture of the fibrous absorbent body 15g and the water absorbent resin B6g was used as the lower layer. Samples were molded and evaluated. The results are shown in Table 2.

[Comparative Example 5]
A sample was molded in the same manner as in Example 1 except that a mixture of 15 g of the fibrous absorbent body and 10 g of the water absorbent resin B was used as the upper layer, and only the fibrous absorbent body 15 g was used as the lower layer. went. The results are shown in Table 2.

[Comparative Example 6]
A sample was molded in the same manner as in Example 1 except that a mixture of 15 g of the fibrous absorbent and 10 g of the water absorbent resin A was used as the upper layer, and only the fibrous absorbent 15 g was used as the lower layer. went. The results are shown in Table 2.

[Comparative Example 7]
The same as in Example 1 except that a mixture of the fibrous absorbent body 15g and the water absorbent resin A6g was used as the upper layer, and a mixture of the fibrous absorbent body 15g and the water absorbent resin B4g was used as the lower layer. Samples were molded and evaluated. The results are shown in Table 2.

[Comparative Example 8]
A thin paper (basis weight 15 g / m ² ) 30 × 40 cm ² was used instead of the fibrous absorber used for the upper layer, and a sample was molded in the same manner as in Example 2 except that the water absorbent resin B was granulated. Evaluation was performed. The results are shown in Table 2.

In Comparative Examples 1 to 3, in either the upper layer or the lower layer of the absorbent body, the fibrous absorbent body and the water absorbent resin were not mixed, and the water absorbent resin was only granulated on the fibrous absorbent body. As a result, the water-absorbing resin did not fall apart and swelled into a lump to prevent the liquid from being absorbed. Thus, good results in both absorption speed and reversibility were not obtained.
In Comparative Example 4, since the water absorption rate of the upper layer water-absorbent resin was faster than the lower layer, the absorption rate was good at first, but the liquid did not migrate to the lower layer but was absorbed only in the upper layer, so The liquid could not be absorbed, and finally, good results were not obtained in both absorption speed and reversibility. Similarly, in Comparative Example 7, the water absorption rate of the upper water-absorbent resin was set to be faster than that of the lower layer, so that no liquid was transferred to the lower layer, and good results in both absorption rate and reversibility were not obtained.
In Comparative Examples 5 and 6, since the fibrous absorber and the water absorbent resin were mixed only in the upper layer and the water absorbent resin was not used in the lower layer, the holding power was inferior, and good results were not obtained in both the absorption rate and the reversibility. .
In Comparative Example 8, since the water-absorbing resin was dispersed on the thin paper as the upper layer, the water-absorbing resin immediately swelled and became a lump and prevented the absorption of the liquid, and both the absorption speed and reversibility were good. The result was not obtained.

It is sectional drawing of an example of the excrement absorption sheet for pets of this invention.

Explanation of symbols

  10: Excrement absorption sheet for pets, 11: Top sheet, 12: Absorber, 13: Back sheet, 16: Upper layer, 17: Lower layer, 18: Liquid diffusable sheet, 19: Water absorbent resin B, 20: Fibrous Absorber, 21: fibrous absorber, 22: water absorbent resin A

Claims (5)

In a pet excreta absorption sheet having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body provided therebetween,
The absorber has two layers, an upper layer and a lower layer, the upper layer is made of a mixture of the fibrous absorber and the water absorbent resin B, and the lower layer is made of a mixture of the fibrous absorber and the water absorbent resin A,
The excreta absorbent sheet for pets, in which the water absorption resin A used for the lower layer has a higher liquid absorption rate than the water absorption resin B used for the upper layer.   The excretion for pets according to claim 1, wherein a mass ratio (water absorbent resin B / water absorbent resin A) of the water absorbent resin B and the water absorbent resin A contained in the absorbent body is 7/3 to 1/9. Object absorption sheet.   The pet excreta absorption sheet according to claim 1 or 2, further comprising a liquid diffusable sheet between the upper layer and the lower layer.   The pet excreta absorption sheet according to any one of claims 1 to 3, further comprising a deodorant between the top sheet and the back sheet.   The pet excreta absorption sheet according to any one of claims 1 to 4, wherein the deodorant is provided between the lower layer and the top sheet.

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