JPH0214018B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention relates to a method for producing meal products as feed from animal bones, sebum, etc.

(B) Conventional Technology Conventionally, methods for producing protein feed using bones, sebum, etc. as raw materials include oil-temperature dehydration and high-temperature steaming.

(C) Problems to be Solved by the Invention According to this conventional method, not only is the quality of the protein deteriorated due to the necessity of heat treatment at high temperatures, but also the generation of bad odors is dramatically increased, resulting in a loss of quality. There were various problems in terms of public health and odor pollution. In particular, when using the oil temperature dehydration method, not only does the product have a high residual oil percentage (approximately 13%), which is poor quality, but the oil extraction process using an expeller is essential, which causes protein destruction, and the power There are various drawbacks such as high cost and high cost required for maintenance and management of the equipment.

(d) Means for solving the problem In the present invention, raw materials obtained by pulverizing bones and sebum are put into a hot water bath stirring tank and heated in hot water of 60 to 80°C for about 1 hour.
The mixture is stirred and boiled for about 2 hours, then separated into separated solids and boiling liquid using a centrifuge, and the separated solids are put into a pressure dryer and dried, and the boiled liquid is put into a coagulation can. The boiled liquid containing water-soluble proteins is put into a three-phase centrifuge and separated into coagulated solids, fats and oils, and water. It is an object of the present invention to provide a method for producing bone meal, which is characterized in that the bone meal is mixed with a separated solid substance and dried.

(E) Function/Effect According to this invention, raw materials are stirred and boiled at low temperature using hot water, the boiled raw materials are separated into separated solids and broth, and the separated solids are dried under pressure. By boiling the broth at a high temperature, separating the broth into coagulated solids, oil and fat, and water, and drying the coagulated solids under pressure together with the separated solids, a high-quality meal with a reduced residual oil percentage is produced. The aim is to reduce costs while manufacturing products and facilitating maintenance and management of equipment.

(f) Examples The manufacturing method of the present invention will be explained based on the manufacturing steps shown in the drawings.

As raw materials, bones, sebum, inedible internal organs, blood, animals, fish and shellfish, etc. can be used, but in this example, the case where bones are used as raw materials will be described below.

First, bones, which serve as raw material 1, are crushed into particles by a crusher 2, and then this crushed raw material is put into a hot water bath stirring tank 3, where it is stirred and boiled in hot water from a hot water boiler 4. become. In this case, warm water of about 60°C to 80°C is stored in the same tank 3 and boiled for about 1 to 2 hours while stirring, and blood, fat, water-soluble proteins, etc. are dissolved in the warm water by this stirring boiling. It will be eluted.

After the crushed raw material is stirred and boiled as described above, it is taken out from the water bath stirring tank 3 and separated into separated solids 5 and boiling liquid 6. In this case, a horizontal centrifuge 7 is used. Moisture content using
Separated solids 5 and boiling liquid 6 are separated by 50% or less.

Then, the separated solids 5 separated by the centrifugal separator 7 are put into a pressure dryer 8, where 2 to 5
It dries while applying pressure of about kg/cm. Then, this dry solid is passed through a sieve and a crusher 9 to produce a smooth powdered bone meal product 10.

On the other hand, the boiling liquid 6 separated by the centrifuge 7 contains water-soluble proteins and fats and oils eluted into the warm water, and fats and oils and water separated from the bones by the centrifuge. The boiling liquid 6 is then put into the coagulation can 11, where it is heated to about 100°C.
Water-soluble proteins are coagulated by boiling them. In this case, it is preferable to reduce the pressure inside the coagulation can 11 in order to promote coagulation of the protein. After coagulating the protein in the boiling liquid 6 as described above, this is transferred to the three-phase centrifuge 1.
2, it is separated into a coagulated solid content 13, an oil and fat content 14, and a water content 25. Of these, the coagulated solid content 13 is mixed with the separated solid matter 5 in the pressure dryer 8 described above. There is. Further, after the oil and fat component 14 is separated, it is put into an oil and fat refining tank 15 and refined there to produce an oil and fat product 16. Further, the water 25 is purified by the sewage treatment facility 22.

Incidentally, the oil and fat products taken out from this oil and fat purification tank 15 may be further subjected to an ultracentrifuge 17, but since the oil and fat separation effect is achieved by the three-phase centrifugal separator 12 mentioned above, This ultracentrifuge 17 does not necessarily need to be provided.
Further, the protein particles 18 separated by this ultracentrifuge are sent to a pressure dryer 8 in the same way as the solidified solid matter 13 described above.
You will be guided within. In addition, each of the above-mentioned treatment steps involves the generation of malodorous gas, and the malodorous gas is removed from the pressure dryer 8 and coagulation can 11 using a vacuum generator such as a vacuum pump. The exhaust gas from the pressure dryer 8 and the coagulation tank 11 is guided into the water-cooled heat exchanger 20 by the device 19, and contains a large amount of high-temperature water vapor. It is cooled by the cooling water 26 to become condensed water 21, and the water-soluble malodorous gases are dissolved in this condensed water 21 and then purified in the sewage treatment facility 22, while the insoluble malodorous gases are purified by the vacuum generator. After passing through the device 19, it is led to an incinerator 23, where it is decomposed and deodorized. In addition to the incinerator 23, an adsorption device using activated carbon, an odor eliminating device using chemicals, etc. may be used to perform the deodorizing function.

In addition, the above-mentioned vacuum generator 19 can also be used for reduced pressure drying when the drying in the pressure dryer 8 is insufficient. In addition, the hot water 24 generated by the heat exchange action is transferred to the hot water bath stirring tank 3.
The hot water is introduced into the boiling water and used as hot water for stirring and boiling, which reduces fuel consumption and brings about the advantage of energy saving. Note that, if necessary, the hot water 24 may be led to the hot water boiler 4 and then led from the boiler 4 to the water bath stirring tank 3.

Therefore, in the production method of the present invention, since the process is performed at a low temperature using hot water, it is possible to reduce thermal denaturation of proteins, and also to reduce the elution of collagen and improve the protein yield. It is possible to improve this, and also to reduce the generation of foul-smelling gases. In addition, since it does not rely on oil temperature dehydration, the residual oil rate can be significantly reduced (6% or less), and since pressure drying is used, the digestibility of protein can be increased, making it possible to produce high-quality meal products. Obtainable. Furthermore, unlike the oil temperature dehydration method, there is no need to use a compressor, and a centrifugal separator can be used, so power costs can be reduced and the equipment can be easily maintained.

In addition, since the oil and fat products are treated at low temperatures, there is no oxidation and high quality oils and fats can be recovered.Also, water-soluble proteins are eluted into the boiling liquid, and this can be solidified by boiling at 100℃, so the oil and fats can be recovered. It has the advantage that separation work can be easily performed.

As described above, the present invention has the excellent effect of producing high-quality meal products, preventing odor pollution, saving thermal energy,
This is an excellent manufacturing method in many aspects, including lower power costs, lower equipment costs, and easier maintenance and management of the equipment.

In addition, since water-soluble protein can be extracted and mixed into the product, the protein yield can be improved, and since fats and oils are not mixed into the product, the product is not sticky, making it easier to measure the product and store it in bags etc. It's easy to do.

[Brief explanation of drawings]

The drawings are manufacturing process diagrams of the present invention. 1: Raw materials, 3: Water bath tank, 5: Separated solids,
6: Boiled liquid, 7: Centrifugal separator, 8: Pressure dryer, 1
1: coagulation can, 12: three-phase centrifuge, 13: coagulated solid content, 14: oil and fat content, 25: moisture.

Claims (1)

[Claims] 1 Raw material 1 obtained by crushing bones and sebum is placed in a hot water bath stirring tank 3, stirred and boiled in warm water at 60 to 80°C for about 1 to 2 hours, and then separated into solids by a centrifuge 7. The separated solids 5 are put into a pressure dryer 8 and dried,
The boiled liquid 6 is put into a coagulation can 11 and boiled at about 100°C, and the boiled liquid 6 containing water-soluble proteins is applied to a three-phase centrifuge 12 to obtain a solidified solid content of 13 and an oil and fat content of 1.
4. Separated into water 25, of which solidified solid content 13
A bone meal production method characterized in that the bone meal is mixed with the separated solid material 5 in the pressure dryer 8 and dried.