JP2595447B2 - Pet toilet sand - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to pet toilet sand used as a litter for pet toilets such as cats and dogs, and a method for producing the same.

[0002]

2. Description of the Related Art An excellent conventional mineral litter for pet toilet and its production method is disclosed in Japanese Patent Publication No. Hei 5-8647 filed by the present applicant (hereinafter referred to as one of the prior arts of the present applicant). . The above-mentioned conventional toilet sand of the applicant of the present application has a high ability to absorb urine and the like, and also has a good deodorizing ability.In addition, when urine is added, only a small amount of toilet sand that has absorbed urine forms a nodule. Since it hardens, it also has the economics of being able to dump it alone and has good handling. However, it is still very useful at this time. Also, its manufacturing method must be an excellent one that can easily produce porous granules.

[0003] However, the above-mentioned conventional toilet sand of the applicant of the present invention is made of mineral bentonite, which is made porous and lowers its apparent specific gravity. It must be said that it has an apparent specific gravity. It is very difficult in terms of manufacturing to always make this an apparent specific gravity of less than 0.7. The apparent specific gravity is sufficiently small compared to the previous toilet sand, but recently, toilet sand using paper and wood flour has been proposed, and some have been implemented. In comparison, it must be said that it is large (it goes without saying that minerals are overwhelmingly superior to those using paper and wood flour in the basic performance of other toilet sands).

[0004] The present applicant has further developed a lightweight toilet sand having a small apparent specific gravity in addition to the above, while maintaining the high basic performance as the toilet sand of the prior art of the present applicant. And proposed this (Japanese Unexamined Patent Publication No.
No. 287626, hereinafter referred to as a second conventional example of the present applicant.

[0005] Briefly, this is achieved by adding 30% or less of expanded perlite having a particle size of 0.05 mm to 2 mm to finely ground natural bentonite as a main component, and further adding 10% or less of other This is pet toilet sand granulated into porous granules from a raw material obtained by allowing the addition of the above components.

Therefore, the second conventional example of the present applicant obtains the effect of reducing the apparent specific gravity while maintaining high performance in terms of deodorization and urine absorption, and as a result, reduces the weight in the same bulk. This facilitates loading and unloading between vehicles during transportation, carrying between a warehouse at a store and a storefront, carrying a purchaser who is a consumer at home, and other handling. Furthermore, as described above, the weight of dust generated after using the toilet sand can be reduced by considerably reducing the own weight.

The second conventional example of the applicant of the present invention is excellent as described above. However, during the repeated production, when urine is applied, only the applied toilet sand is combined with each other to form a nodule. It was found that there was a problem that the nodule generating power by urine, which is generated, was slightly unstable and sometimes collapsed.

[0008]

SUMMARY OF THE INVENTION In the present invention, the above-mentioned two problems of the prior art of the present applicant, that is, the ability to form nodules due to unstable urine are corrected, and In addition, it is an object of the present invention to solve the problem, and to further enhance the basic performance as other toilet sand, that is, the urine absorbing ability and the deodorizing ability.

[0009]

The gist of one aspect of the present invention is that the degree of swelling is 18 cc / 2 g (ACC
Method, the same shall apply hereinafter) A mixture of finely ground sodium bentonite and finely ground calcium bentonite having a particle size of 3 mm
For pets composed of porous granules from raw materials obtained by adding 20 to 50% of the following pearlite and allowing addition of other components not exceeding 15% to their granule mixture as a main component This is toilet sand, whereby the above problem can be solved.

The gist of the second configuration of the present invention is as follows.
20-50% of pearlite having a particle size of 3 mm or less is added to a mixture of finely ground sodium bentonite having a degree of swelling of 18 cc / 2 g or more and finely ground zeolite, and more than 15% is added to a mixture of these granules as a main component. It is a pet toilet sand made into a porous granular material from a raw material obtained by allowing the addition of other components, thereby solving the above-mentioned problem.

The gist of the third configuration of the present invention is as follows.
20-50% of pearlite having a particle size of 3 mm or less is added to a mixture of finely ground sodium bentonite and finely ground calcium bentonite having a swelling degree of 18 cc / 2 g or more, and 5% or less to a mixture of those granules as a main component. Is a pet toilet sand made of porous granules by using a raw material obtained by adding a superabsorbent resin of the above and further allowing addition of other components not exceeding 15% to this superabsorbent resin additive mixture. ,
This can solve the problem.

The gist of the fourth aspect of the present invention is that 20-50% of pearlite having a particle size of 3 mm or less is added to a mixture of finely ground sodium bentonite having a degree of swelling of 18 cc / 2 g or more and finely divided zeolite. The mixture is obtained by adding a superabsorbent resin of 5% or less to the mixture of the granules which are the main components, and further allowing the addition of other components not exceeding 15% to the mixture containing the superabsorbent resin. This is pet litter for pets formed into a porous granular material by a raw material, and the above problem can be solved.

Some supplementary explanations of the above-mentioned inventions 1 to 4 will be given below. As described above, the finely ground sodium bentonite needs to have a swelling degree of 18 cc / 2 g or more, and preferably, 20 cc / 2 g or more is used. As described later, since the toilet sand of the present invention contains a large percentage of perlite, it is difficult to obtain a sufficient state of consolidation as the toilet sand. Therefore, as the sodium bentonite, a highly viscous substance should be used, but as described above, based on the degree of swelling, it is about 18 cc / 2 g or more, more preferably, about 20 cc / 2 g or more, And the greater the mixing ratio, the more firmly the toilet sand is obtained without losing porosity during the process of toilet sand production, and the stronger the mutual adhesion of toilet sand when urine is applied Thus, a baby-boom is easily formed.

By adjusting the mixing ratio of the finely ground sodium bentonite and the finely ground calcium bentonite or the finely ground zeolite, the water absorbing capacity and the deodorizing capacity, the solidifying power, and the adhesive strength when absorbing water, that is, In addition, the balance with the ability to generate nodules by urine can be adjusted.

That is, when the proportion of sodium bentonite having a high degree of swelling is increased as described above, the ability of the obtained toilet sand to form nodules by urine can be enhanced. It can also enhance the solidification force when granulating as toilet sand. It should be noted that simply using a highly viscous sodium bentonite can enhance the caking force when granulating toilet sand, but cannot enhance the ability of urine to form nodules. Conversely, when the proportion of calcium bentonite or zeolite is increased, the water absorbing power and the deodorizing power can be enhanced.

The apparent specific gravity of the pearlite is approximately 0.15, and the apparent specific gravity can be considerably reduced by mixing a large amount of the mineral matter in the toilet sand. Gives good results but has no tackiness. Therefore, as described above, sufficient consideration must be given to the properties of sodium bentonite. That is, when perlite is mixed in a large ratio, based on the degree of swelling, a good sodium bentonite is selected, and the ratio is increased as much as necessary with respect to calcium bentonite or zeolite, and the nodules are formed by urine. When the mixing ratio of pearlite is not so large, the formation ratio and the adhesion ratio of calcium bentonite or zeolite can be increased.

Considering the capacity of available sodium bentonite, specifically, the mixing ratio of pearlite is limited to about 50%, and if it is less than 20%, it is difficult to obtain a sufficient effect for reducing the apparent specific gravity.

Therefore, on the one hand, sodium bentonite and calcium bentonite or zeolite are used from the viewpoint of obtaining a good balance of toilet sand performance (urine absorbing power, deodorizing power, and nodule forming power by urine). As described above, the mixing ratio of sodium bentonite and calcium bentonite or zeolite is adjusted based on the relationship between the mixing ratio of the perlite and the mixing ratio of pearlite added from other viewpoints (described below) in terms of reducing the apparent specific gravity and adjusting the mixing ratio. The proportion should be further adjusted. In addition, as the mixing ratio of pearlite increases, sodium bentonite having a higher degree of swelling should be selected.

The apparent specific gravity can be further reduced by granulating the toilet sand in a porous manner.
Of course you have to take it into account. As described above, it is appropriate to use the perlite having a particle size of 3 mm or less in relation to the size of toilet sand to be granulated. It is more preferable that the thickness be 1 mm or less.

By the way, regarding the third and fourth aspects of the present invention, as described above, a superabsorbent resin of 5% or less is added as a main component as described above. Needless to say, the addition of the superabsorbent resin dramatically improves the urine absorption power. The superabsorbent resin may be a general one, and the type thereof is not limited. The resin preferably has a particle size of about 50 to 200 μm. However, other than that is not so inconvenient.

Specific examples of these compounds include cross-linked polyacrylates, cross-linked starch-acrylates, acrylates, saponified vinyl acetate copolymers, cross-linked acrylate-acrylamide copolymers. And crosslinked polyoxyethylene. Note that their water absorption performance is 200
It is preferably about 800 times. If the water absorption performance is too high, water to be added to other components when granulating the toilet sand is taken away, and if it is too low, it does not help to improve the water absorption power.

In one of the first to fourth aspects of the present invention, the main component comprising the sodium bentonite, the calcium bentonite or the zeolite, and the perlite, and the third and fourth aspects of the present invention, further comprise a superabsorbent resin. As the components other than the main components, as described above,
Components such as various deodorants, fragrances or germicides can be mixed. In some cases, a tackifier may be added. However, most cohesive adjuvants, which are currently sold as drugs, become firmly consolidated by adding them and lose their viscosity even when urine is applied, that is, lose the ability of urine to form nodules. Care must be taken when employing it, as it is highly likely that it will be used.

As described above, components other than the main components can be mixed only in a range not exceeding 15%. Beyond this, due to the ingredients, the formation of nodules when absorbing water such as urine is adversely affected, the apparent specific gravity is increased, or there is harm that cannot be dumped into fields after use. There is fear.

In the above pet litter, finely ground sodium bentonite and finely ground calcium bentonite or finely ground zeolite are mixed at an appropriate ratio according to the above-mentioned conditions, and 20 to 50% of pearlite is added thereto. Further, in the case of the third and fourth aspects of the present invention, a superabsorbent resin of 5% or less is added to the granule mixture as the main component, and in any case, if necessary, 15% or less.
%, A suitable water-absorbing and / or deodorizing mineral, a suitable tackifier, a deodorant, a water-absorbing agent, and / or a fragrance. , Granulate to be porous. The apparent specific gravity should be less than 0.5. If possible, it should be around 0.4. The apparent specific gravity of natural bentonite that was just crushed was 0.9
It is about 5. The appropriate size of the sand particles to be granulated is about 1 mm to 5 mm. However, there is no significant problem even if the particle size is slightly larger than this.

Two specific examples suitable for producing the pet litter according to the present invention in a porous manner will be described below. First, a raw material mixture is first produced by mixing the necessary components as the toilet sand, and the raw material mixture is kneaded by a kneading means while being hydrated. A plurality of cylindrical rotating bodies partitioned into a plurality of sector-shaped rolling drying chambers at intervals are charged into the respective rolling drying chambers, the cylindrical rotating bodies are rotated on their own, and charged into the rolling drying chambers. The obtained granules are dried by blowing hot air while gently rolling inside the granules to produce porous granules.

Second, a raw material mixture is first produced by mixing the necessary components as the above-mentioned toilet sand, and the raw material mixture is kneaded by a kneading means while being hydrated. The granules produced by the kneading are mesh-plated. The granular material placed on the mesh plate is dried by blowing hot air from below while applying vibration so that the granular material placed on the mesh plate advances in a certain direction, and dried to produce the granular material.

The above two manufacturing methods will be described more specifically. In any case, the raw material mixture is, for example, charged into a kneader or the like and kneaded, while the raw material mixture is 45 to
Add about 60% water. The amount of water is not limited to this, and is determined while observing the kneading state. That is, when water is added to the raw material mixture while kneading with a kneader or the like, a granular material is immediately formed. This kneading continues until the watering conditions are averaged and averaged particulate matter is formed. In the case of kneading by a kneader, it is repeated several times as necessary. The particulate matter formed at this time is formed by kneading without applying pressure, and thus becomes porous having many voids inside.

Next, in the case of the above-mentioned production method, the granular material produced as described above is charged into a rotary drier in an appropriate amount in order, and is rolled while hot air is supplied, and is gradually dried. . As described above, the cylindrical rotating body that constitutes the rotary dryer is configured such that the inside is divided into a plurality of section-shaped rolling dryers at constant angular intervals,
Into each of the tumble drying chambers, the granular material is charged, the cylindrical rotating body is rotated on its own, and the granular material charged in the tumble drying chamber is gently rolled inside to generate hot air. It is blown and dried. By drying the granules in such a way that only minimal pressure is applied,
The granules are formed into porous granules without thickening and without applying pressure.

In the case of the two manufacturing methods, as described above, the granules produced by the kneading are placed on a mesh plate, and the granules placed on the mesh plate are fixed. Hot air is sent from below while applying vibration so as to advance in the direction, and drying is performed. Thus, similarly, by drying while applying a minimum pressure to the granular material, the granular material is formed into a porous granular material without thickening and without applying pressure.

As described above, in any case, the raw material mixture is first simply kneaded by the kneading means and kneaded, and the granulated material is very easily formed into a granular material having many voids therein without applying pressure. be able to. Thereafter, in the case of the one manufacturing method, the granular material is charged into a plurality of sections having a cross-sectional sector shape of the cylindrical rotary body, and the drop height at the time of rotation of the cylindrical rotary body is reduced. In this way, it is intended to maintain the porous state by drying with hot air while reducing the external pressure or impact as much as possible. In the case of the two production methods, hot air drying is performed while rolling on the mesh plate, so that no external pressure is applied and the porous state is surely maintained. The dried granules are sieved to obtain, for example, particles having a particle size of about 1 to 5 mm.

[0031]

According to the present invention, the pet litter according to the first and second aspects of the present invention is used as a litter for a pet litter similarly to general sand. In such a case, the porous structure itself has a very high water absorption, and is 100 to 111%.
It has a moderate water absorption capacity. The water absorption is improved about 3.5 times as compared with the natural bentonite grains which are simply crushed, and 1.75 to 1 times as compared with the pet toilet sand as one of the conventional examples of the present applicant. It has a water absorption of about .94 times. Compared to the second conventional example of the present inventor, 1.
It is improved to about 3 to 1.44 times.

The third and fourth aspects of the present invention further include a super water-absorbent resin in their constituent elements, and thus have better water absorbability. It has improved about six times. As described above, the water absorption is greatly improved, so that the urine of the pet is well absorbed, and the urine is reliably trapped in the toilet sand. It also has almost the same deodorizing power as the same amount of zeolite.

Further, when water is added, in any of the toilet sands according to any one of the first to fourth aspects of the present invention, the absorbed toilet sand particles have a strong adhesive force, and the adjacent ones solidify in a nodular form. Therefore, only toilet sand that has absorbed urine can be easily and selectively removed. Moreover, as described above, in the first and second cases of the present invention, 3.5 compared to natural bentonite which was merely crushed.
Since it has twice as much water absorption power, it is extremely economical, as compared with that, it is sufficient to remove and discard about 30% of toilet sand. In the third and fourth toilet sands of the present invention, only a small amount, about 24% of the toilet sand, may be removed and discarded.

The pet litter according to the first to fourth aspects of the present invention is not limited to being granulated in a porous manner, but also has a perlite of 20 to 50.
%, The apparent specific gravity is 0.5
It becomes below. For this reason, it is less than half of that of mere natural bentonite granules, and it is extremely easy to handle in loading and unloading in transportation, moving to display positions at dealers, carrying buyers and moving at home. It has become easier.

The pet litter according to any one of the first to fourth aspects of the present invention is used as a litter for a pet litter and then applied to a field as it is to improve the neutralization of acidic soil and the improvement of drainage. It can be used as a material or can be mixed with compost to improve its quality. Therefore, the pet litter can be usefully used even after use, and has an advantage that waste is not increased. Furthermore, when dumping as waste, its specific gravity is halved,
Alternatively, since it is further reduced, there is an advantage that the used toilet sand as waste can be reduced.

The pet litter according to the first to fourth aspects of the present invention described above can be produced by various methods. it can. That is, according to the first and second production methods, a granular material is produced without applying pressure to the raw material mixture, so that the raw material mixture has a large number of voids therein. Further, since the impact and pressure of the granules are not applied as much as possible in the subsequent drying step, it is possible to obtain toilet sand having a very small apparent specific gravity without crushing the voids generated in the granulating step.

[0037]

【Example】

EXAMPLES Finely ground sodium bentonite and calcium bentonite are mixed at a ratio of 1: 1 and pearlite is added to the powdered bentonite mixture. The ratio is as follows: powdered bentonite mixture: pearlite = 60: 40 (% by weight)
And The sodium bentonite had a swelling degree of 22.
The pearlite used had a particle size of 2 mm or less. The raw material mixture thus obtained was charged into a kneader and kneaded, and at a stage where a good mixing state was obtained,
Add water while continuing to knead. When water was added while observing the progress of granulation, the water addition ratio became 50% with respect to the raw material mixture. The raw material mixture containing water in the kneader changed into large and small particles having a large number of small voids in the kneading process.

Next, the above-mentioned water-containing granules are successively charged into a rotary drier, rolled and transferred, and then dried with hot air. The cylindrical rotary body 1 of the rotary dryer is
As shown in FIG. 1, the inside is partitioned into a plurality of rolling drying chambers 2, 2,... Are charged into each of the tumbling drying chambers 2, 2,..., The cylindrical rotating body 1 is rotated about its axis 3, and the granular materials charged into the tumbling drying chambers 2, 2,. Hot air is blown while being rolled in the interior to dry.

In this way, when the cylindrical rotary member 1 rotates, the granular material moves only in the above-mentioned rolling drying chambers 2, 2,.
The head at the time of rolling is reduced, and eventually, the impact due to the fall is reduced, so that a large number of small gaps inside are not crushed. Thereafter, the hot air dried granules are sieved into granules of 1 to 5 mm. The remaining 1 to 5 mm granular material was used as pet litter.

EXAMPLE A finely ground sodium bentonite and zeolite are mixed in a ratio of 2: 3, and perlite is added to the powder mixture. The ratio is as follows: powder mixture: pearlite = 6
9.9: 30 (% by weight). A fungicide and a fragrance are added in a total amount of 0.1% to the mixture containing the perlite. The sodium bentonite has a swelling degree of 22 cc / 2
g and that of pearlite having a particle size of 2 mm or less. The raw material mixture obtained as described above is charged into a kneader and kneaded, and at the stage where a good mixing state is obtained, water is further added while continuing to knead. When water was added while observing the progress of granulation, the water addition ratio became 48% with respect to the raw material mixture. The raw material mixture containing water in the kneader changes into large and small particles having a large number of small voids in the kneading process.

Then, as shown in FIG. 2, the granules 4, 4... Containing water are successively placed on a mesh plate 5, and the mesh plates 5 are placed on the granules 4, 4,. Is applied so as to advance in a certain direction. In addition, hot air is sent from below to dry the granules 4, 4,.... Are thus dried by hot air while rolling, so that the drying is completed without impact and without crushing the internal voids. Finally, the hot air-dried granules 4, 4... Are sieved into 1 to 5 mm granules. The remaining 1 to 5 mm granular materials 4, 4... Are used as pet toilet sand.

Example 1 Finely pulverized sodium bentonite and calcium bentonite are mixed in a ratio of 1: 1 and a powder of perlite and a crosslinked polyacrylate is added to the powdered bentonite mixture. The proportion of the powdered bentonite mixture:
Pearlite: crosslinked polyacrylate = 69: 30: 1
(% By weight). The sodium bentonite used had a swelling degree of 22 cc / 2 g, and the pearlite was 2 m
It has a particle size of less than m. The crosslinked product of polyacrylate used was a powder having a size of 100 μm.

The raw material mixture thus obtained is charged into a kneader and kneaded. When a good mixing state is attained, water is further added while kneading is continued. When water is added while observing the progress of granulation, the water addition ratio is 50% with respect to the raw material mixture.
It became. The raw material mixture containing water in the kneader changed into large and small particles having a large number of small voids in the kneading process.

Next, the above-mentioned water-containing granules are successively charged into a rotary drier, rolled and transferred, and then dried with hot air. The cylindrical rotary body 1 of the rotary dryer is
Using that of the embodiment, as shown in FIG. 1, the inside of the rolling drying chambers 2, 2,.
Are charged into each of the rolling and drying chambers 2, 2,... Of the cylindrical rotating body 1, and the cylindrical rotating body 1 is The granules loaded in the tumbling drying chambers 2, 2,... Are gently tumbled inside, and blown with hot air to be dried.

In this way, when the cylindrical rotating body 1 rotates, the granular material moves only in the above-described rolling drying chambers 2, 2,.
The head at the time of rolling is reduced, and eventually, the impact due to the fall is reduced, so that a large number of small gaps inside are not crushed. Thereafter, the hot air dried granules are sieved into granules of 1 to 5 mm. The remaining 1 to 5 mm granular material was used as pet litter.

REFERENCE EXAMPLE Finely pulverized sodium bentonite is charged into a first-stage kneader and kneaded to add water. The proportion of water is 25% with respect to the finely ground sodium bentonite. The finely divided sodium bentonite hydrated in the kneader granulates into large and small. The granules thus obtained are transferred from the first-stage kneader to the second-stage kneader and further kneaded. Thereafter, the above-mentioned particulate matter containing water is successively charged into a cylindrical rotating body of a rotary dryer, rolled and transferred, and dried with hot air. Then, the hot-air dried granules are 1 to 5 mm.
Sieve into the granules.

REFERENCE EXAMPLE Finely pulverized sodium bentonite and calcium bentonite are mixed at a ratio of 1: 1 and pearlite is added to the resulting fine powder bentonite mixture. The percentage is
Fine powder bentonite mixture: pearlite = 85:15
(% By weight). The above pearlite is 0.1-1mm
The particle size of it was adopted. The raw material mixture thus obtained is charged into a kneader and kneaded to add water. The water addition ratio was 30% based on the raw material mixture. The raw material mixture containing water in the kneader changed into large and small particles having a large number of small voids in the kneading process.

Thereafter, the above-mentioned particulate matter containing water is successively charged into a rotary dryer, rolled and transferred, and dried with hot air. Finally, the hot-air dried granules are sieved into granules of 1 to 5 mm. The remaining 1 to 5 mm granular material was used as pet litter.

REFERENCE EXAMPLE This is only a case where natural bentonite is crushed with a crusher using commercially available pet litter.

Next, Tables 1 and 2 show test results on the properties of the above Examples and Reference Examples.

[0051]

[Table 1]

In Table 1 above, the water absorption and solidification are as follows. Water absorption: A sample was placed in a beaker, 20 cc of water was poured from above, the weight of the solidified portion was measured, and the weight of water was subtracted from this weight. Solidification: The lump of the material obtained in the water absorption test was pressed between fingers immediately after pouring water and after 48 hours, and the way of collapse or collapse was observed.

[0053]

[Table 2]

The deodorizing properties in Table 2 are as follows. Deodorization: 20 g of a sample is placed in a 300 ml Erlenmeyer flask, and 0.1 g of 10% ammonia water is dropped therein.
Seal immediately. After 10 minutes and 20 minutes, the residual concentration of ammonia gas in the flask was measured using a gas detection tube.

The litter obtained in the above embodiment has the following properties. Extremely high water absorption, having a water absorption of about 100% to 125% of its weight.
As compared with one of the prior art examples of the present applicant shown as a reference example, about 1.75 to
It has a water absorption of 1.94 times and about 2.18 times about the examples. Compared to the conventional example 2 of the present applicant shown as a reference example, about 1.3 about the examples and the present invention.
１1.44 times, about 1.62 times the water absorption of the example, and about 3 times even in the example having the smallest water absorption for the crushed toilet sand shown as a reference example. .3 times the water absorption.

However, as a result of the extremely high absorbency, urine is confined inside the toilet sand, and similarly a good deodorizing effect is produced. In addition, when moisture such as urine is applied, an adhesive force is generated, and adjacent particles are instantaneously bonded to form a nodule. Moreover, this does not easily collapse over time. There is a difference in this point from the reference example,
This difference is extremely large in practical use.

The apparent specific gravity of the toilet sand of each embodiment of the present invention is 0.4 to 0.45. Since the reference example is 0.75, it is 60% or less thereof. It is about 80% of that of the reference example, but is 50% or less of that of the reference example. Further, the used toilet sand can be put into a field to perform pH adjustment, improvement of drainage, and other soil improvement effects. It can be added to compost and used to improve it. There is no need to dump.

Thus, it was used by laying it in a box-shaped pet toilet having a size of 40 cm square and a depth of 10 cm and having a thickness of about 5 to 6 cm, as described above. It was very good from any viewpoint of chemical conversion. After using the toilet sand in the fields, good results have been obtained.

[0059]

The pet litter of the present invention has overwhelmingly high water absorption and strong deodorizing property as compared with the conventional sand. Further, it has the same deodorizing power as the same amount of zeolite.
In addition, nodulation due to urine or the like occurs immediately and does not easily disintegrate over time. Therefore, it is easy and economical to selectively remove only the portion that has absorbed urine. In addition, since the specific gravity is extremely small, no burden is imposed on loading / unloading during transportation, moving at a store, carrying the purchaser, and the like. In addition, since the used toilet sand can be used for soil improvement material such as fields, there is no need to dump. Also, in case of unavoidable discarding, the apparent specific gravity is small, so that the weight to be discarded is very light.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional explanatory view of a cylindrical rotating body of a rotary dryer used in an embodiment.

FIG. 2 is a schematic explanatory view showing a hot-air drying step of an example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical rotating body 2 Tumble dryer 3 Shaft 4 Granular material 5 Mesh plate

Claims (4)

(57) [Claims] A mixture of finely ground sodium bentonite and finely ground calcium bentonite having a degree of swelling of at least 18 cc / 2 g (ACC method, the same applies hereinafter) is added with 20 to 50% of pearlite having a particle size of 3 mm or less, and Pet litter for pets constituted by porous granules from raw materials obtained by allowing the addition of no more than 15% of other components to the granule mixture of the granules. 2. A mixture of finely ground sodium bentonite having a degree of swelling of 18 cc / 2 g or more and finely ground zeolite, 20 to 50% of a pearlite having a particle size of 3 mm or less, and a mixture of those granules as a main component. Litter for pets constituted by porous granules from raw materials obtained by allowing the addition of other components not exceeding 15% to the above. 3. A mixture of finely divided sodium bentonite and finely divided calcium bentonite having a degree of swelling of 18 cc / 2 g or more, wherein 20 to 50% of pearlite having a particle size of 3 mm or less is added, and those granules which are the main component. A pet formed into a porous granule from a raw material obtained by adding a superabsorbent resin of 5% or less to the mixture and further allowing addition of other components not exceeding 15% to the superabsorbent resin added mixture. For toilet sand. 4. A mixture of finely ground sodium bentonite having a degree of swelling of not less than 18 cc / 2 g and finely divided zeolite, wherein 20 to 50% of pearlite having a particle size of 3 mm or less is added, and a mixture of these granules as a main component is added. 5% or less superabsorbent resin is added to the mixture, and the mixture obtained by allowing addition of other components not exceeding 15% to the superabsorbent resin addition mixture is made into a porous granular material for pets. Toilet sand.