JP2001103947A - Device for sterilizing, drying and cooling livestock feed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for sterilizing, drying and cooling a livestock feed, which can accurately sterilize the livestock stained with salmonella bacteria and other harmful bacteria and can effectively dry the feed in a proper state and simultaneously effectively cool the feed. SOLUTION: This device for sterilizing, drying and cooling a livestock feed is obtained by connectedly disposing pressure-resistant screw.presses on the upper and lower sides of a pressure paddle type sterilizer, respectively, and is used by charging heated steam into the pressure paddle type sterilizer at a pressure of 1.2 to 3 kg/cm2, bringing the steam into contact with the livestock feed fed from the upper side pressure-resistant screw.press into the pressure paddle type sterilizer for 2 to 6 min to heat the feed at a temperature of 70 to 130 deg.C and sterilize salmonella bacteria and other harmful bacteria without degenerating the ingredients of the feed, feeding the 70 to 90 deg.C sterilized feed having a water content of 18 to 25% into deaeration tanks, and then maintaining the deaeration tanks at a vacuum degree of 15 to 30 Torr for 3 to 10 min to dry and cool the sterilized feed into the product having a water content of 10 to 15% and a temperature of 20 to 25 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to salmonella contaminating livestock feed (including raw materials for livestock feed or livestock feed products) such as cattle, pigs and chickens, and other harmful bacteria (for example, pathogenic Escherichia coli 0-). 157).

[0002]

BACKGROUND OF THE INVENTION Livestock feed for cattle, pigs, chickens, etc., for example, meat-and-bone meal, is produced by heat-treating meat pieces, meat scraps, bone-in meat pieces, etc., generated from a meat processing plant, and then crushing the meat and bone meal. As well as fish meal and fish solubles, it is a very rich nutrient source, so that it is contaminated by various microorganisms even after production, and in particular, contamination by salmonella and other harmful bacteria has become a problem.

[0003] It should be noted that livestock foods such as meat and eggs are contaminated with salmonella and other harmful bacteria because salmonella and other harmful bacteria present in the intestines and manure of livestock before slaughter.
Although there are many opportunities for meat and eggs to come into contact after slaughter,
In addition, raw meat, livestock foods such as raw eggs are not subjected to heat treatment until cooked, Salmonella bacteria, as a response to other harmful bacteria, because it depends on washing and refrigeration, It is said to be insufficient as a countermeasure.

[0004] However, according to a recent survey, contamination of feed provided to livestock has been pointed out as a problem of contamination of livestock foods such as meat and eggs by salmonella bacteria and other harmful bacteria. That is, in the production process of livestock feed such as meat-and-bone meal and fish meal, which are animal protein sources, since there is no special sterilization treatment process, the feed is contaminated by Salmonella bacteria and other harmful bacteria in the production process, It is shipped as it is, causing various problems.

[0005] The Ministry of Agriculture, Forestry and Fisheries' Fertilizer Inspection Laboratory inspected 1786 samples of livestock feed for the degree of contamination with Salmonella, and found that the salmonella positive rate was 18.0% (321 samples).
It was reported that meat flour 5
4%, meat and bone meal 24.9%, animal protein mixture 34.6
%, Fish meal 13.6%, poultry processing by-product 14.3%, feather meal 8.2%, and others 5.3%, demonstrating high contamination rate of animal protein feed such as meat meal and meat-and-bone meal. Was done.

[0006] Therefore, since livestock feed is often already contaminated with Salmonella and other harmful bacteria when it is received at a processing plant, sterilization of livestock feed is becoming an important problem in the feed manufacturing industry. Therefore, there is a long-felt need for a suitable sterilizer for livestock feed.

Conventionally, there are physical sterilization methods and chemical methods for sterilizing salmonella bacteria and other harmful bacteria in livestock feed, and the former includes sterilization by heating air or irradiation, etc. Has the disadvantage of denaturing the nutritional components of livestock feed by heat, and the latter includes the addition of fungicides or the addition of organic acids such as propionic acid or formic acid. There is a problem that it cannot be completely harmless to the ingesting human, and the addition of the organic acid has drawbacks in bactericidal effect, cost, taste and the like.

[0008] Examples of sterilizers for livestock feed for Salmonella and other harmful bacteria include an air-flow sterilizer, a high-speed stirring type sterilizer, a tower-type sterilizer, and the like, but those that do not meet the sterilization conditions of livestock feed for Salmonella. Many livestock feeds have low sterilizing ability, and there was no appropriate livestock feed sterilizer.

In particular, when steam is supplied to a livestock feed layer formed by simply filling a livestock feed in a sterilizing apparatus and sterilization is performed, the steam is applied to the whole livestock feed layer because the livestock feed layer is thick. In many cases, even if efforts are made to discharge steam drain, steam drain inevitably remains in the livestock feed layer, making livestock feed sticky. Was.

Conventionally, sterilized livestock feed carried out from a sterilizing apparatus is heated to 70 to 90 ° C. and contains a large amount of water, so that it is necessary to dry and cool the livestock feed. For drying and cooling, dry cooling equipment that uses air is often used.In this case, if the air used is contaminated with bacteria or impurities, the livestock feed is contaminated with bacteria or impurities, and the quality deteriorates. In addition to inviting poor products and the like, it may cause fatal problems in hygiene.

Therefore, hitherto, the air for drying and cooling the sterilized livestock feed is preliminarily dried and cooled by an expensive drying and cooling device separately installed before being introduced into the device. In addition, there is a disadvantage that running costs such as energy costs and labor costs increase.

Also, recent livestock feeds are seldom composed of a single component due to the phenomena of high quality and high grade products, and there are many products containing several to dozens of components. In this case, when air is supplied to the livestock feed to perform drying and cooling, the livestock feed floats, disturbing a state where the livestock feed is uniformly mixed, and causing a separation phenomenon called demixing.

[0013] Further, regarding the drying and cooling of livestock feed having a high water content and high temperature, the drying step and the cooling step are performed separately, which not only complicates the treatment step but also increases the drying step. The necessity of a device and a cooling device has disadvantages in terms of space economy and device installation cost.

[0014]

SUMMARY OF THE INVENTION The present invention relates to an apparatus for sterilizing and drying and cooling Salmonella bacteria and other harmful bacteria contaminating livestock feed. The present invention relates to a livestock feed contaminated with Salmonella bacteria and other harmful bacteria. It is an object to disinfect accurately, to effectively dry to an appropriate state of 10 to 15%, and to effectively cool to an appropriate temperature of 20 to 25C at the same time.

Further, the present invention minimizes the contact between livestock feed and steam drain and rapidly discharges steam drain when sterilizing Salmonella bacteria and other harmful bacteria contaminating livestock feed with steam. The purpose is to prevent stickiness of livestock feed.

Further, the present invention provides two or more pressurized paddle-type sterilizers connected in series with a pressure-type screw press according to the properties of livestock feed and the state of bacterial contamination. It is an object to sterilize the livestock feed optimally by adjusting the feeding speed of the feed, the steam supply conditions to the livestock feed, the contact residence time, the temperature, and the like.

Further, the present invention pays attention to the fact that the sterilized livestock feed carried out from the sterilizer is heated to 70 to 90 ° C., and utilizes the self-caloric value of the sterilized livestock feed as in the prior art. Without providing a separate heat source for heating the drying air, the equipment cost and operation cost are reduced,
It is an object of the present invention to provide a livestock feed drying and cooling apparatus with high processing efficiency.

Further, the present invention relates to the above-mentioned method of drying and cooling livestock feed, by setting an appropriate degree of vacuum and processing time for the livestock feed, performing an optimum drying and cooling treatment, and obtaining a high-quality livestock feed. The purpose is to get.

Further, the present invention provides a method of drying and cooling sterilized livestock feed by preventing the use of a dry cooling device using air to prevent contamination of livestock feed by bacteria and impurities present in the air. It is an object of the present invention to maintain good hygiene management of feed, and further to dry and cool livestock feed without disturbing the separation of livestock feed by air and the uniform composition of livestock feed components.

Further, the present invention relates to an integrated sterilizing and drying / cooling apparatus for drying and cooling livestock feed having a high water content and high temperature without separately performing a drying step and a cooling step as in the prior art. It is an object of the present invention to efficiently dry and cool livestock feed by a series of operations, simplify the treatment process and reduce running costs, and at the same time, reduce space economy and equipment installation costs.

Further, according to the present invention, in the above-mentioned livestock feed sterilizing and drying / cooling apparatus, a pressurized screw press is provided continuously on the upper side and the lower side in accordance with the properties of the livestock feed and the state of contamination by fungi. A plurality of pressure paddle-type sterilizers are arranged in parallel or in series to adjust the sterilization conditions of livestock feed in the pressure paddle-type sterilizer, and a deaeration tank is connected to each pressure paddle-type sterilizer, It is characterized by adjusting the sterilization and drying / cooling conditions of the sterilized livestock feed inside.

Further, the present invention provides a sterilizing and drying / cooling apparatus for livestock feed as described above, wherein two pressurized paddle-type sterilizers are alternately connected to each pressurized paddle-type sterilizer to sterilize the feed in the degassing tank. It is characterized by adjusting the sterilization and drying / cooling conditions of the livestock feed.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a livestock feed sterilizing, drying and cooling apparatus according to the present invention will be described with reference to FIG. 1. An upper pressure-resistant paddle type sterilizer 1 for sterilizing livestock feed contaminated with bacteria is shown in FIG. Screw press 2 is connected in series, and a lower pressure-resistant screw press 3 is connected to the lower side of the pressurized paddle-type sterilizer 1, so that the upper pressure screw press 2 and the lower pressure-type screw press 3 are connected. Inside,
Feed blade 5 rotated by motor 4 and motor 14
And the feed blade 15 are additionally provided.

The feed side of the upper pressure-type screw press 2 and the lower pressure-type screw press 3 is provided with a feed port 6 and an inlet 16 for livestock feed, and a cone valve 8 and a cone valve 18 are provided on the feed side. The cone valve 8 and the cone valve 18 are connected to the hydraulic cylinder 7 and the hydraulic cylinder 17 to hold the pressing mechanism, that is,
It has a material sealing function that forms a pressure-resistant seal by the livestock feed itself.

Inside the pressurized paddle type sterilizer 1, a rotary shaft 10 on which a plurality of paddles 9 are mounted at intervals is mounted, and this rotary shaft 10 is rotated by a pulley 13 to form a pressurized paddle type sterilizer. The livestock feed supplied into the sterilizer 1 is configured to be conveyed from the inlet 12 to the drop port 19, and the pressurized paddle-type sterilizer 1 further includes a steam decompression unit 2.
2 is connected to a steam pipe 23 attached thereto, and the livestock feed is fed to the pressurized paddle type sterilizer 1 by 70-
It is configured to heat to a temperature of 30 ° C., and the pressurized paddle type sterilizer 1 has a steam safety valve 24 and a pressure gauge 20.
Is attached.

A lower end of the pressurized paddle type sterilizer 1 is connected to one end of a discharge pipe 21 and the other end is connected to the first end.
Connected to the upper part of the deaeration tank 29 and the second deaeration tank 30,
A branch valve 26, a first inflow valve 27 and a second inflow valve 28 are attached to the discharge pipe 21, and a first outflow valve 31 and a second outflow valve 31 are provided below the first deaeration tank 29 and the second deaeration tank 30, respectively. Outflow valve 3
2, a suction pipe 3 connected to a vacuum pump 36 above the first degassing tank 29 and the second degassing tank 30.
5 are connected, and a first vacuum valve 33 and a second vacuum valve 34 are additionally provided.

When two first deaeration tanks 29 and two deaeration tanks 30 are connected in parallel to the lower part of the pressurized paddle type sterilizer 1, the first deaeration tank 29 and the second deaeration tank 3 are connected.
0 is alternately switched, and the drying and cooling of the sterilized livestock feed can be performed continuously, which is efficient. However, in the case of a small-scale apparatus, one pressurized paddle-type sterilizer 1 is used for degassing. A tank can be connected.

Next, the operation of the present invention will be described.
Livestock feed contaminated with Salmonella bacteria and other harmful bacteria is fed into the upper pressure-resistant screw press 2 from the inlet 6, and the feed is fed to the cone valve 8 by the feed blade 5 rotated by the motor 4. However, the cone valve 8 is connected to the hydraulic cylinder 7 to form a holding mechanism. When the feed force of livestock feed exceeds a certain level, the cone valve 8
The valve 8 is pressed and opened, and a predetermined amount of livestock feed is filled into the inlet 13 of the pressurized paddle type sterilizer 1 from the outlet 11 of the upper pressure-resistant screw press 2.

The livestock feed filled in the pressurized paddle-type sterilizer 1 falls through the inlet 13 through the pressurized paddle-type sterilizer 1 by rotation of a plurality of paddles 9 attached to the rotating shaft 10 at intervals. Conveyed sequentially to the mouth 19, at this time, 1.2 to 3 kg / cm ² of heated steam is blown into the pressurized paddle type sterilizer 1 from the steam pipe 23 to make contact with livestock feed for 2 to 6 minutes. Then, the livestock feed is heated to a temperature of 70 to 130 ° C. to sterilize Salmonella bacteria and other harmful bacteria without denaturing the components of the livestock feed.

Livestock feed which has sterilized Salmonella bacteria and other harmful bacteria is filled into the receiving port 16 of the lower pressure-resistant supply feeder 3 from the drop port 19 of the pressurized paddle type sterilizer 1, and the feed blade 15 rotated by the motor 14 is provided. The feed of livestock feed is carried out by pressing the cone valve 18, which is connected to the hydraulic cylinder 17 and serves as a holding mechanism. When the feed power of the livestock feed exceeds a certain level, the cone valve 18 is pressed and opened, A predetermined amount of sterilized livestock feed is transported to the discharge pipe 21 of the lower pressure screw press 3.

Next, at the same time as switching the branch valve 26 of the discharge pipe 21, the first inlet valve 27 is opened, and the livestock feed having a sterilized water content of 18 to 25% and 70 to 90 ° C. is placed in the first deaeration tank 29. After the first inlet valve 27 is closed, the second vacuum valve 34 is opened at the same time as the second vacuum valve 34 is opened, and the degree of vacuum in the first degassing tank 29 is maintained at 15 to 30 Torr for 3 to 10 minutes, whereby the boiling point of livestock feed is reduced. The water content of the sterilized livestock feed is lowered to 15-30 ° C and dried to 10-15% and cooled to 20-25 ° C.

The livestock feed dried and cooled in the first deaeration tank 29 is opened at the same time as the first outflow valve 31 is opened.
4 is closed, transported to an external storage tank (not shown) and stored as a product. When the livestock feed in the first degassing tank 29 is completely transported and emptied, the first outflow valve 31 is closed. Thereafter, the second inflow valve 28 is opened at the same time as the branch valve 26 of the discharge pipe 21 is switched, and a predetermined amount of the sterilized livestock feed is introduced into the second deaeration tank 30.

After the introduction of the livestock feed into the second deaeration tank 30 is completed, the second inflow valve 28 is closed and the second vacuum valve 34 is opened at the same time, and the vacuum pump 36 opens the first deaeration tank 29. By keeping the degree of vacuum at 15 to 30 Torr for 3 to 10 minutes, the boiling point of the livestock feed is lowered to 15 to 30 ° C, and the moisture content of the sterilized livestock feed is dried to 10 to 15%, and the temperature is raised to 20 to 25 ° C. Cooling.

The dried and cooled livestock feed in the second deaeration tank 30 is opened at the same time as the second outflow valve 32 is opened.
4 is closed, transported to an external storage tank (not shown) and stored as a product. When the livestock feed in the second degassing tank 30 is completely transported and emptied, the second outflow valve 32 is closed. Thereafter, the branch valve 26 of the discharge pipe 21 is switched again, and at the same time, the first inflow valve 27 is opened, a predetermined amount of sterilized livestock feed is introduced into the first degassing tank 29, and the above-described drying and cooling is continued.
Thereafter, this may be repeated.

The steam used for sterilizing the livestock feed is liquefied and drained as a drain to the bottom of the pressurized paddle-type sterilizer 1 so that the steam does not come into contact with the sterilized livestock feed. Dispose promptly to the outside.

The cone valve 8 and the cone valve 18 are connected to a hydraulic cylinder 7 and a hydraulic cylinder 17 operated by a hydraulic device 25. Instead of the hydraulic cylinder 7 and the hydraulic cylinder 17, an air cylinder or a mechanical cylinder is used. A simple spring mechanism (not shown) may be used to adjust the feed rate of livestock feed.

It should be noted that the livestock feed is pressurized paddle type sterilizer 1
Before heating and sterilizing by injecting heated steam into the pressurized paddle-type sterilizer 1 (at the time of idle operation before the start of the sterilization process), heating steam is blown into the pressurized paddle-type sterilizer 1 in advance.
The inside surface of the paddle 9 and the paddle 9 are brought to a temperature suitable for the sterilization treatment, and the steam drain used in the sterilization and remaining in the pressurized paddle-type sterilizer 1 is dried to prevent the wetting of the livestock feed. In this case, the upper pressure-resistant screw press 2 and the lower pressure-resistant screw press 3 are closed by the cone valve 8 and the cone valve 18 described above. The pressure paddle type sterilizer 1 may be closed.

The heating steam supplied to the pressurized paddle sterilizer 1 must be 1.2~3kg / cm ^2, the drain attachment to livestock feed and steam is less than 1.2 kg / cm ² In addition, it is unsuitable because the water release due to instantaneous re-evaporation immediately after the discharge of livestock feed is poor and the powder properties deteriorate, and if it exceeds 3 kg / cm ² , the pressure resistance of the device is further required. This is unsuitable because the cost of the apparatus only increases and the sterilizing effect is not so high.

The contact time between the livestock feed and the heated steam in the pressurized paddle-type sterilizer 1 needs to be 2 to 6 minutes, and if it is less than 2 minutes, the effect of the steam to sterilize and kill Salmonella bacteria or the like becomes insufficient. Therefore, it is inappropriate.
Exceeding the time is not suitable because the heated drain adheres to the livestock feed and stickiness occurs, deteriorating the powder properties.

The heating temperature for livestock feed in the pressurized paddle type sterilizer 1 must be 70 to 130 ° C. If the temperature is lower than 70 ° C., the heating becomes insufficient and the sterilizing effect deteriorates, which is not appropriate. On the other hand, when the temperature exceeds 130 ° C., the bactericidal effect of Salmonella and the like is enhanced, but the components contained in livestock feed are denatured, which is not suitable.

The pressurized paddle type sterilizer 1 has a diameter of 1
350-3000mm, length 3500-60000m
m, and the rotation speed of the rotating shaft 10 on which a plurality of paddles 9 are attached at intervals is 1.2 to 3.
0 m / min is appropriate, and the diameter of the upper pressure-resistant screw press 2 and the lower pressure-resistant screw press 3 communicating with the pressurized paddle type sterilizer 1 is 150 to 300 m.
m, the length is preferably 2000 to 6000 mm, and the rotation speed of the feed blades 5 and 15 is 30 to 60 r / m.
in is appropriate.

The supply amount of the sterilizing steam, the contact time between the livestock feed and the steam, the sterilizing temperature for the livestock feed, the shape of the pressurized paddle-type sterilizer 1, the shape and the number of paddles 9, and the rotation with the paddle 9 attached Rotation speed of shaft 10, upper pressure-resistant screw press 2 and lower pressure-resistant screw press 3
Shape, pitch and shape of feed blades 5 and 15, feed blade 5
The conditions such as the rotation speeds of (15) and (15) may be appropriately determined according to the type of livestock feed, the type and degree of contamination of contaminating bacteria, the purpose of sterilization, and the like.

The degree of vacuum of the first deaeration tank 29 is set to 15 to 30
When the pressure is reduced to less than 15 Torr, the effect of evaporating and cooling the livestock feed does not increase as the degree of vacuum is increased. This is because not only is the removal of the livestock feed in a vapor state by promoting the vacuum (reduced pressure) evaporation of the water of the livestock feed, but also the cooling effect of the livestock feed due to the latent heat of the steam becomes insufficient, which is an inadequate measure.

If the degree of vacuum in the first degassing tank 29 into which the sterilized livestock feed is introduced is kept at 15 to 30 Torr for 3 to 10 minutes, the water evaporation effect and the cooling effect of the livestock feed will be reduced if it is less than 3 minutes. Inadequate drying and cooling of the livestock feed become inadequate, and if it exceeds 10 minutes, the water evaporation effect and the cooling effect of the livestock feed as the transport time is prolonged become significant. Instead, it is inadvisable to become Errugyros.

The first degassing tanks 29 and 30 need to have pressure resistance in a vacuum, and have a diameter of 500 to 2000 m.
m and a length of 1000 to 2500 mm are preferably used. As means for reducing the pressure in the first degassing tanks 29 and 30 to a vacuum state, in addition to the above-described vacuum pump 36, a steam ejector, an air ejector, or the like is used. May be used.

In FIG. 1, the first degassing tank 2
9 and two second deaeration tanks 30 are pressurized paddle type sterilizer 1
Are connected in parallel, and the first degassing tank 29 and the second degassing tank 30 are alternately switched so that the drying and cooling of the sterilized livestock feed can be continuously and efficiently performed. When the pressure paddle type sterilizer 1 is small-scale or when livestock feed to be sterilized is small, one deaeration tank may be connected to the pressure paddle type sterilizer 1.

[0047]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Two degassing tanks are connected in parallel to a pressurized paddle type sterilizer having a structure as shown in FIG. 1 and connecting the upper pressure-resistant screw press and the lower pressure-resistant screw press of the following specifications. And saturated steam was blown into the pressurized paddle-type sterilizer under the condition of ² kg / cm ² to preheat the inside of the pressurized paddle-type sterilizer to 120 ° C.

(1) Pressurized paddle type sterilizer: outer diameter 270 mm, length 1500 mm, total volume 80 L, effective 50 L motor 0.75 kW × (0 to 10 r / m), paddle height 20 mm × length 80 mm, 30 sheets , Pitch 50mm Receiving port 150mm, Drop port 150mm, (2) Upper pressure-resistant screw press (same for lower pressure-resistant supply feeder) Outer diameter 100mm, Length 1200mm, Motor 11kw x 1-60r / m, Feed blade Variable pitch (100～50P) inlet 150 mm, the outlet 150 mm, (3) degassing the tank outer diameter 600 mm, length 1060 mm, volume entirety 200L, valid 260L, vacuum pump 2.2kW × (100m ³ / h (emissions)),

The mash previously contaminated with Salmonella (150 kg / h) filled from the input port was fed into a pressurized paddle type sterilizer through an upper pressure-resistant screw press. The steam supply amount to be blown into the paddle type sterilizer, the contact time between the mash and the steam, the mash sterilization temperature is changed as follows to perform the mash sterilization process, and the mash Salmonella bacteria to be carried out from the lower pressure-resistant supply feeder. The sterilization state was examined.

Mash filling rate 10% 30% 40% 50% 70% Steam supply rate 1 kg / cm ² ++ ++ ++ ++ 2 kg / cm ² ----++ Contact time Sterilization temperature 2 minutes 70 ° C +++++++ ++ 4 minutes 70 ° C −− − − − + 3 minutes 100 ° C −− − − − ++ 3 minutes 120 ° C −− − − − − + * "-" indicates negative for Salmonella bacteria * "-" indicates negative It is negative for Salmonella, but shows low sterilization throughput. * "+" Indicates positive for Salmonella * "++" indicates positive for Salmonella and cannot be used as feed

Sterilized 90 ° C. mash conveyed from the lower pressure screw press of the pressurized paddle type sterilizer is alternately introduced into a deaeration tank under the following conditions, and the following is performed by a vacuum pump. The mash was subjected to a vacuum decompression treatment, and the mash had the following moisture content, cooling temperature, bacterial contamination, residual ratio, and quality.

Vacuum degree Vacuum degree Vacuum degree Vacuum degree 10 Torr 20 Torr 60 Torr 100 Torr Water content (%) 12 14 18 20 Cooling temperature (° C.) 20 24 50 55 Bacterial contamination None None None None Residual ratio (%) 0.1 0. 1 5 5 Quality Good Good Good Good

As described above, the mash that has been subjected to the vacuum depressurizing treatment in the degassing tank is sufficiently dried and cooled.
In addition, mash does not adhere to or remain in the degassing tank, thereby preventing re-contamination and maintaining good hygiene management of the mash.Moreover, without disturbing the separation of the mash and the uniform composition of components, The mash could be transported smoothly in the deaeration tank without quality.

[0054]

[Comparative Example] A pressure-type paddle type sterilizer in which an upper pressure-resistant screw press and a lower pressure-resistant screw press having the structure shown in the example are connected to each other. A cooling device is connected in series, and a sterilized 90 ° C. mash that is carried out from a lower pressure-supplying feed screw press of a pressurized paddle type sterilizer is subjected to a counterflow-type drying / cooling device under the following conditions. When the mash was introduced and subjected to vacuum decompression treatment with a large blower as described below, the water content, cooling temperature, bacterial contamination, residual ratio and quality of the mash were as follows.

(1) Counter-flow type drying / cooling device: diameter 500 mm, length 1000 mm, volume 250 L, effective 200 L, blower 5.5 kW × (1200 m ³ / h),

Vacuum degree Vacuum degree Vacuum degree Vacuum degree 730 Torr 730 Torr 730 Torr 730 Torr Air flow Air flow Air flow Air flow 100 m ³ / h 400 m ³ / h 600 m ³ / h 1200 m ³ / h Water content (%) 20 18 16 13 Cooling temperature (° C.) 53 48 30 21 Bacterial contamination degree ++ ++ ++ Remaining percentage (%) 15 15 15 15 Quality Not possible Not possible Not possible Not possible

As described above, the mash that has been subjected to the vacuum depressurizing treatment in the drying and cooling device of the counterflow type is dried and cooled. However, a small amount of mash may adhere and remain in the drying and cooling device. In that case, the mash that had been sterilized would recontaminate, the hygiene control of the mash was incomplete, and furthermore, the separation of the mash and the uniform composition of the ingredients could be disturbed, resulting in the quality of the mash. .

[0058]

According to the present invention, Salmonella bacteria and other harmful bacteria contaminating livestock feed can be effectively sterilized, and the water content of the sterilized livestock feed can be reduced by 10%.
It has an excellent advantage that it can be cured and dried to an appropriate state of 〜15% and can be efficiently cooled to an appropriate temperature of 20 to 25 ° C.

Further, according to the present invention, for sterilizing salmonella and other harmful bacteria in livestock feed by steam, contact between the livestock feed and the steam drain is minimized, and the steam drain is quickly discharged to remove the livestock feed. It is possible to prevent stickiness.

According to the present invention, two or more pressurized paddle-type sterilizers connected with a pressure-type screw press are arranged in parallel or in series according to the properties of livestock feed and the state of bacterial contamination. Optimal sterilization of livestock feed can be performed by adjusting the supply speed, the conditions of steam supply to the livestock feed, the contact residence time, the temperature, and the like.

Further, according to the present invention, since air is not used for drying and cooling livestock feed having a high water content and high temperature, contamination of bacteria and impurities by air can be prevented, and the properties of livestock feed can be prevented. And quality can be ensured.

Further, according to the present invention, the drying and cooling of the sterilized livestock feed is carried out without using a drying and cooling device using air, and the livestock feed is free from bacteria and impurities by air and has good hygiene control. It is possible to produce high-quality livestock feed in a uniform component-mixed state without separation.

Further, the present invention relates to the drying and cooling of sterilized livestock feed, which is performed by a series of operations using a single apparatus without performing a drying step and a cooling step separately as in the prior art. Since cooling can be performed efficiently at the same time, processing steps are simplified, running costs can be reduced by half, and space economy and equipment installation costs are also reduced by half. There are advantages that are possible.

Further, according to the present invention, it is not necessary to install a tower-type apparatus main body and a large-scale blower unlike the conventional counter-flow type drying and cooling apparatus for drying and cooling sterilized livestock feed. And equipment cost 1 /
It is possible to reduce to 5.

Further, according to the present invention, for drying and cooling of sterilized livestock feed, an appropriate degree of vacuum and processing time are set according to the type of livestock feed and the like, and an optimal dry and cooling treatment is performed. It is possible to obtain quality livestock feed.

[Brief description of the drawings]

[Fig. 1] A pressurized screw press is connected to the upper and lower sides of a pressurized paddle type sterilizer, and sterilization, drying and cooling of livestock feed with a degassing tank attached to the lower pressurized screw press. It is sectional drawing of an apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressurized paddle type sterilizer 2 Upper pressure-resistant screw press 3 Lower pressure-resistant screw press 4 Motor 5 Feed blade 6 Input port 7 Hydraulic cylinder 8 Cone valve 9 Paddle 10 Rotary shaft 11 Outlet 12 Receptacle 13 Pulley 14 Motor 15 Feed blade 16 Inlet 17 Hydraulic cylinder 18 Cone valve 19 Drop outlet 20 Pressure gauge 21 Outlet 22 Steam decompression unit 23 Steam piping 24 Steam safety valve 25 Hydraulic device 26 Branch valve 27 First inlet valve 28 Second inlet valve 29 First Deaeration tank 30 Second deaeration tank 31 First outflow valve 32 Second outflow valve 33 First vacuum valve 34 Second vacuum valve 35 Suction pipe 36 Vacuum pump

Claims (3)

[Claims] 1. A pressure-resistant screw press is connected to the upper and lower sides of a pressurized paddle-type sterilizer, and 1.2 to 3 kg / cm ² of heated steam is blown into the pressurized paddle-type sterilizer. Contact with livestock feed supplied to the pressurized paddle type sterilizer from the pressure-resistant screw press on the side for 2 to 6 minutes, and by heating to a temperature of 70 to 130 ° C. without denaturing the components of livestock feed, Salmonella bacteria, After sterilizing other harmful bacteria, sterilized water content 18 to 2
5% livestock feed at 70-90 ° C is introduced into the degassing tank,
By keeping the deaeration tank at a vacuum of 15 to 30 Torr for 3 to 10 minutes, the moisture content of the sterilized livestock feed is dried to 10 to 15%, and the livestock feed is cooled to 20 to 25 ° C. Cooling system. 2. A pressurized paddle-type sterilizer having a plurality of pressurized screw presses connected to the upper side and the lower side in parallel or in series according to the properties of livestock feed and the state of bacterial contamination. Adjusting the sterilization conditions of livestock feed in the paddle-type sterilizer, connecting a degassing tank to each pressurized paddle-type sterilizer, and adjusting the sterilization and drying and cooling conditions of the sterilized livestock feed in the degassing tank. Item 9. A sterilizing, drying and cooling device for livestock feed according to Item 1. 3. The sterilization and drying / cooling conditions of the sterilized livestock feed in the degassing tank are adjusted by alternately connecting two degassing tanks to each pressurized paddle type sterilizer. Or sterilization of livestock feed according to claim 2,
Drying and cooling equipment.