JP2002000101A - Bedding for livestock and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bedding maintaining its mechanical strength even after absorbed urine or the like by contacting with animal excreta or the like and capable of composting after used. SOLUTION: This bedding for livestock comprises a product with a biodegradable resin stuck on the surface of water-absorbing paper scrap or its beaten product, wherein the amount of the resin is 10-20 pts.wt. per 100 pts.wt. paper scrap or its beaten product.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to livestock litter and a method for producing the same.

[0002]

2. Description of the Related Art Up to now, rice straw has been mainly used as a litter for livestock, but rice straw has been shredded and spread on rice fields due to the spread of rice cultivation using combine harvesters. Obtaining litter is becoming more difficult,
There is a strong demand for the development of rice straw bedding substitutes that have good heat insulation and good absorbability of animal urine and the like. JP-A-8-256
No. 621 discloses a litter made of waste paper having good water absorbency. However, when used as a litter, the litter absorbs urine and the like and easily loses its mechanical strength. Therefore, it was not yet satisfactory.

[0003]

DISCLOSURE OF THE INVENTION The present invention relates to a livestock capable of composting after use without easily losing its mechanical strength even when the urine or the like is in contact with animal excrement or the like. An object of the present invention is to provide a litter and a method for producing the litter.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have completed the present invention. That is, according to the present invention, a biodegradable resin is adhered to the surface of a water-absorbent paper piece or a water-absorbent paper fibrillated material, and the ratio of the resin is per 100 parts by weight of the paper piece or the paper fibrillated material. A livestock litter characterized by a ratio of 1 to 20 parts by weight is provided. According to the present invention, the unit bedding is composed of an aggregate of unit litters, and the unit litter is made of an adhesive obtained by attaching a biodegradable resin to a surface of a water-absorbent paper piece or a fibrillated paper, and A livestock litter characterized in that the weight is in the range of 0.003 to 3 g and the ratio of the resin is 1 to 20 parts by weight per 100 parts by weight of the paper piece or the paper defibrated material. Is done. Furthermore, according to the present invention, a mixture of a water-absorbent paper piece or a fibrillated paper fibrous material and a biodegradable resin is heated to the melting temperature of the biodegradable resin, and the resin is melted to melt the resin. Liquid is attached to the surface of the paper piece or the paper defibrated material and then cooled, and the ratio of the resin is 1 to 20 parts by weight per 100 parts by weight of the paper piece or the paper defibrated material. A method for producing a litter for livestock characterized by the following. Furthermore, according to the present invention, a mixture of a bioabsorbable paper piece or a fibrillated paper and a biodegradable resin,
Kneading and extruding at a melting temperature of the biodegradable resin using an extruder, wherein the ratio of the resin is 1 to 20 parts by weight per 100 parts by weight of the paper piece or the paper defibrated material. And a method for producing a litter for livestock. Furthermore, according to the present invention, the method comprises spraying a solution or suspension containing a biodegradable resin onto a water-absorbent paper piece or a fibrillated fibrous material, followed by drying. A method for producing litter for livestock, characterized in that the ratio is 1 to 20 parts by weight per 100 parts by weight of paper defibrated material.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, as a litter material, a water-absorbing paper piece or a fibrillated paper is used. As the water-absorbing paper, used paper can be generally used. In this case, the used paper includes used newspapers, used books (phonebooks, timetables, comic books, etc.), used cardboard, and the like. Such old newspapers, old papers and the like are shredded or crushed and used as litter material.

The shape and size of the paper piece used as a litter material in the present invention are not particularly limited, but generally, the shape can be a strip shape, a flake shape, a strip shape, or the like. The size (length) is 5 to 100 c.
m, preferably about 10 to 50 cm. In the case of a flake shape, it is preferable to use one side of which is 5 to 15 mm.

[0007] The litter used in the present invention may be a fibrillated paper (cotton). In the present invention, a defibrated material of waste paper corrugated paper can be preferably used as a litter material.

[0008] In the present invention, a biodegradable resin is attached to the litter material to be used as a litter. In this case, various conventionally known biodegradable resins can be used. Such materials include aliphatic polyesters, (polybutylene succinate, polyhydroxybutyrate, polylactic acid, polycaprolactone, etc., and copolymers thereof), polyvinyl alcohol, natural polymers (cellulose, starch, gelatin, casein, etc.). ) And blends thereof.

The method of attaching the biodegradable resin to the litter material is not particularly limited, and various methods can be used. Such methods include a method of mixing a resin melt with the material, an aqueous resin dispersion (emulsion, suspension, etc.)
And a method of drying by mixing or spraying an aqueous resin solution or a method of dipping in an aqueous resin dispersion or an aqueous resin solution and drying.

In a preferred embodiment of the method for producing a litter for livestock according to the present invention, after dry-blending a water-absorbent paper piece or a fibrillated paper and a biodegradable resin, the mixture is mixed with the biodegradable resin. Heat to the melting temperature of By this heating, the biodegradable resin is melted and adheres to the surface of the paper piece or paper defibrated material. In this case, as the heating device,
An oven or the like is used. Next, the paper piece or the paper defibrated material to which the molten liquid of the biodegradable resin adheres is cooled.
As a result, a litter composed of a paper piece or a paper defibrated material having the biodegradable resin adhered to the surface is obtained.

[0011] When heating the mixture of the paper piece or paper defibrated material and the biodegradable resin, the mixture can be maintained in a static state, but preferably in a dynamic state. In this case, the dynamic state means that the sheet of paper or the defibrated material is subjected to an external force and changes its position, or the front and back are reversed, so that the resin melt is applied to the whole of the flaked paper or the defibrated material. It means a state in which it is moving so as to be easily adhered uniformly. In this case, the external force includes a stirring force of the rotating blade, a vibration force vibrating in a vertical direction and / or a horizontal direction, and the like.

When a paper piece or a paper defibrated material (hereinafter, also simply referred to as a heated material) to which a molten liquid of a biodegradable resin obtained by heat treatment as described above is attached is cooled, the heated material is static. In addition to being able to be kept in a state or a dynamic state, it can be kept in a floating state. In this case, the floating state means a state in which the heated object is floating in an air stream (for example, an air stream).

As described above, it is possible to obtain a litter having a structure in which a biodegradable resin adheres to the surface of a piece of paper or a defibrated paper. In this case, the litter obtained by cooling the heated material is:
It consists of an aggregate of a large number of unit litters, each of which is made of a low-weight adhesive body to which the paper pieces or the defibrated material are integrally bonded. The bonding state of the paper piece or the paper defibrated material constituting the unit litter differs depending on the ratio of the resin and the like, but the weight of the unit litter composed of the low-weight adhesive is usually 0.003 to 3 g, preferably, 0.01 to 2 g, more preferably 0.01 to 1
g. The litter consisting of an aggregate of unit litters of the present invention,
It is rich in heat insulation, is bulky as a whole, and has excellent mechanical strength and elasticity due to the biodegradable resin adhered to its surface. Is difficult to be formed into a slurry even when absorbing water.

In another preferred embodiment of the method for producing livestock litter according to the present invention, after dry-blending a water-absorbing paper piece or paper defibrated material and a biodegradable resin, the mixture is put into an extruder, where the mixture is placed. After the biodegradable resin is melted and the resin melt is attached to the surface of the paper piece or paper defibrated material, the resin is extruded and cooled. As a result, a litter composed of a paper piece or a paper defibrated material having the biodegradable resin adhered to the surface is obtained. The litter thus obtained is also usually composed of an aggregate of unit litters, similarly to the above-mentioned method, and the weight of the unit litter is usually 0.003 to 3 g, preferably 0.1 g. It is 0.01 to 2 g, more preferably 0.01 to 1 g.

In still another preferred embodiment of the method for producing livestock litter according to the present invention, a solution or suspension containing a biodegradable resin is applied to a water-absorbing paper piece or paper defibrated material in a static or dynamic state. After spraying the suspension, it is dried. Thereby, a paper piece or paper defibrated material having the biodegradable resin adhered to the surface is obtained. The litter thus obtained is also usually composed of an aggregate of unit litters, as in the case of the above method,
The weight of the unit litter is usually 0.003 to 3 g, preferably 0.01 to 2 g, more preferably 0.01 to 1 g.
It is.

The amount of the biodegradable resin adhered to the litter material is 1 per 100 parts by weight of the material (paper piece or paper defibrated material).
-20 parts by weight, preferably 2-15 parts by weight, more preferably 5-10 parts by weight. The amount of the biodegradable resin attached can be adjusted by adjusting the amount of the resin attached to the paper chip or the paper defibrated material in the manufacturing process. When the use ratio of the biodegradable resin is lower than the above range, it becomes difficult to uniformly adhere the resin to the paper piece or the paper defibrated material, while if it exceeds the range, it becomes economically disadvantageous. In addition, the water absorption of the litter is greatly reduced, which is not preferable.

Since the litter of the present invention has a biodegradable resin on its surface, it has excellent heat insulating properties and does not easily lose its mechanical strength even when it comes into contact with animal excrement and the like. It can be easily composted after use.

[0018]

Next, the present invention will be described in more detail with reference to examples.

Example 1 As used paper, flakes of about 8 mm square (irregular shape) obtained by crushing a comic book (average weight: 0.004)
g) was used. As a biodegradable polymer, polylactic acid manufactured by Shimadzu Corporation and Lacty 1012 were used. Its melting point (DSC peak temperature) was 174 ° C. The polylactic acid pellets were pulverized with a wheeley pulverizer to obtain a powder of about 0.3 mm square. 80% by weight of waste paper flakes and 20% by weight of a polylactic acid powder were mechanically mixed.
The mixture was heated in an oven at 190 ° C. for 20 minutes, and then allowed to cool to room temperature. The polylactic acid was partially fused between the waste paper flakes, and a small weight in which a plurality of waste paper flakes were partially adhered to each other. A bulky wastepaper / biodegradable polymer composite consisting of an aggregate of (average weight: about 0.2 g) was obtained.

Example 2 In Example 1, flakes of about 8 mm square (irregular shape) obtained by pulverizing a telephone directory (average weight: 0.003 g) were used as used paper. As a biodegradable polymer,
Polybutylene succinate (Bionore 1 made by Showa Kobunshi)
020) was used. Its melting point (DSC peak temperature) was 114 ° C. This bionore was pulverized with a Wiley type pulverizer to obtain a powder of about 0.5 mm square. 85% by weight of waste paper flakes and 15% by weight of bionole powder were mechanically mixed. This mixture was heated in an oven at 150 ° C. for 20 minutes, and then allowed to cool to room temperature. As a result, the bionole was partially fused between the used paper flakes, and a small weight of a plurality of used paper flakes was partially adhered to each other ( A bulky wastepaper / biodegradable polymer composite comprising an aggregate of adhesives (average weight: about 0.1 g) was obtained.

Example 3 In Example 1, about 8 mm square (irregular) flakes (average weight: 0.003 g) obtained by pulverizing a telephone directory were used as used paper. As a biodegradable polymer,
The synthesized polybutylene succinate adipate copolymer was used. Its melting point (DSC peak temperature) is 9
5 ° C. This copolymer was pulverized with a Wiley type pulverizer to obtain a powder of about 0.5 mm square. 85% by weight of waste paper flakes and 15% by weight of a copolymer powder were mechanically mixed. This mixture was heated in an oven at 150 ° C. for 20 minutes, and then allowed to cool to room temperature. As a result, the copolymer was partially fused between the waste paper flakes, and a plurality of waste paper flakes were partially adhered to each other. Weight (average weight: about 0.1g)
And a bulky wastepaper / biodegradable polymer composite comprising an aggregate of the above-mentioned adhesives was obtained.

Example 4 In Example 1, flakes of about 5 mm square (irregular shape) obtained by pulverizing OA waste paper (average weight: 0.002 g) were used as used paper. As a biodegradable polymer, U
CC poly (ε-caprolactone), Tone P79
7 was used. Its melting point (DSC peak temperature) was 64 ° C. This poly (ε-caprolactone) was pulverized with a Wiley pulverizer to obtain a powder of about 0.5 mm square. 90% by weight of waste paper flakes were mechanically mixed with poly (ε-caprolactone) powder at a ratio of 10% by weight. This mixture was heated in an oven at 150 ° C. for 20 minutes, and then allowed to cool to room temperature. As a result, poly (ε-caprolactone) was partially fused between the waste paper flakes, and a plurality of waste paper flakes were partially fused. Small weight bonded (average weight:
A bulky wastepaper / biodegradable polymer composite consisting of an aggregate of adhesives (about 0.1 g) was obtained.

Example 5 300 parts by weight of water was sprayed on 100 parts by weight of the waste paper / biodegradable polymer composite obtained in Examples 1 to 4, and the properties of the composite after stirring and leaving to stand. Table 1 shows the relationship between and the composition. For comparison, Table 1 shows the results when only used paper flakes were used as a comparative example.

[0024]

[Table 1]

[0025]

The litter of the present invention can be advantageously used as litter for livestock such as cows, pigs, horses, and chickens. After use, it can be easily composted.

Continued on the front page. (72) Inventor Kazuo Nakayama 1-1-1, Higashi, Tsukuba, Ibaraki Pref., National Institute of Advanced Industrial Science and Technology (72) Inventor: Michihiro Dainaga 2 Ikenodai, Kakizaki-cho, Inashiki-gun, Ibaraki Pref. Ministry of Agriculture, Forestry and Fisheries Livestock Experiment Station (72) Inventor Kazuyoshi Suzuki 2 Ikenodai, Kashizaki-cho, Inashiki-gun, Ibaraki Pref.

Claims (5)

[Claims] A biodegradable resin is attached to the surface of a water-absorbent paper piece or a paper-absorbent paper fibrous material, and the ratio of the resin is 1 to 20 per 100 parts by weight of the paper chip or the paper-fiberized material. Livestock litter characterized by the ratio of parts by weight. 2. A unit litter is composed of an aggregate of unit litters, and the unit litter is made of an adhesive obtained by adhering a biodegradable resin to the surface of a water-absorbent paper piece or a fibrillated paper fibrous material, and weighing the same. Livestock litter characterized by being in the range of 0.003 to 3 g, wherein the ratio of the resin is 1 to 20 parts by weight per 100 parts by weight of the paper piece or the paper defibrated material. 3. A mixture of a bioabsorbable paper piece or a fibrillated paper fibrous material and a biodegradable resin is heated to the melting temperature of the biodegradable resin, and the resin is melted to form a molten liquid of the resin. After adhering to the surface of the paper piece or the paper defibrated material, cooling is performed.
A method for producing litter for livestock, characterized in that the ratio is up to 20 parts by weight. 4. A method comprising kneading and extruding a mixture of a bioabsorbable paper piece or a fibrillated paper with a biodegradable resin using an extruder at a melting temperature of the biodegradable resin. Is a ratio of 1 to 20 parts by weight per 100 parts by weight of the paper piece or the paper defibrated material. 5. A method comprising spraying a solution or suspension containing a biodegradable resin onto a water-absorbent paper piece or a fibrillated paper fibre, and then drying the resin or the fibrous material. 1
A method for producing litter for livestock, wherein the ratio is 1 to 20 parts by weight per 00 parts by weight.