JPH08163974A - Secondary sterilization of packed food and apparatus therefor - Google Patents

Abstract

PURPOSE: To provide a method and an apparatus for secondary sterilizing food packed in a synthetic resin bag such as a spitchcock of eels, etc., without spoiling the taste and appearance qualities. CONSTITUTION: This method for secondary sterilizing packed foods is to pack food Z to be packed in a bag comprising a synthetic resin film and heat the food at slightly lower temperature than a resticking temperature of the bag for a short time by irradiation on with far infrared ray. The packed foods are heated by conveying with a transfer conveyor 30a, 30b and 30c and the far infrared ray is irradiated to the foods which are heated in finishing. This apparatus for secondary sterilizing packed foods consists of the transfer conveyor which conveys packed foods packed in the bag of the synthetic resin, etc., in a chamber, a heating means for heating an atmosphere and installed in front part of the transfer conveyor and a far infrared ray generating means directing to the transfer belt in the rear of the conveyor.

Description

Detailed Description of the Invention

[0001]

[Industrial field] This invention is a bag made of synthetic resin film, which is made by breaking eel, conger eel, etc. and white-baking it, or teriyaki with a sauce on it.・ ・ ・ Packed in a bag made of heat-soluble material (hereinafter referred to simply as a bag of synthetic resin, etc.), evacuating the air inside, vacuum-packed (hereinafter referred to simply as packaged food), and reheated for sterilization The present invention relates to a method and a device for secondary sterilization of packaged foods.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 7, the process of broiling eels and conger eels and shipping them is done by broiling the eels, skewering them with or without skewer, and then steaming them. After steaming in the machine B, a plurality of the teriyaki machines C lay the sauce on the sauce for several times, freeze it by the quick freezer F, and sort it by the sorter G to sort the pieces of similar size and weight. , Then stored or shipped immediately.

Further, when packing eels and the like in the bag made of synthetic resin or the like, and evacuating the inside air to perform vacuum packing, after finishing the process of the broiler C, this is manually vacuumed into a bag made of synthetic resin. The process of performing the secondary sterilization E is added to the packed D into the packed food. The term secondary sterilization is a term for primary sterilization, and since it is sterilized even in the heating step of steaming or baking eel etc., this is considered primary sterilization, and the subsequent heating is called secondary sterilization E. To be done.

Conventionally, the step of the secondary sterilization E has been performed by manually packing a bag made of a soft eel and the like in a bag made of synthetic resin and vacuum-packing so that the body of the soft eel or the like is not collapsed in the bagging step of the eel which is the previous step. Therefore, it is carried out to avoid food poisoning due to various bacteria because it is easy for foreign bacteria to adhere to the outside air.
That is, re-heating is performed by immersing broiled rice in hot water at about 80 ° C. for several minutes or by heating with a large microwave oven.

[0005]

However, when these reheating processes are performed with hot water, the heating temperature cannot be changed during heating. Therefore, if the set temperature of the hot water is too low, sterilization will take a long time. If the set temperature is too high, the fish fat inside will exude to the surface, and the color of the sauce will become discolored, reducing the commercial value. Further, in the case of heating by a microwave oven, since the heating is performed by the vibration of the moisture that constitutes kabayaki, there is a problem that the quality is not constant due to the partial amount of water contained in the kabayaki. That is, there is a problem in that the portion of the kabayaki or the like that contains a large amount of non-uniform water content is excessively heated, and the fish fat inside oozes out to the surface as in the case of hot water, causing the color of the sauce to be discolored.
On the contrary, there was a problem that the temperature of the part with less water did not rise and the action of sterilizing various bacteria was weakened.

[0006]

The present invention has been made to solve the above-mentioned problems. As a method, a packaged food is packed in a bag of synthetic resin or the like and irradiated with far infrared rays to re-adhesion temperature of the bag. Heat at a slightly lower temperature for a short time. In addition, broilers and the like are conveyed and heated by a conveyer conveyor, and far-infrared rays are radiated to finish heating in the subsequent conveyance of the conveyer conveyor. Further, as the apparatus, a transport conveyor for transporting, for example, kabayaki packed in a bag made of synthetic resin or the like is provided inside the housing, and a heating means for heating the atmosphere is provided before transporting the transport conveyor. Far-infrared ray generating means is provided for carrying on the conveyor belt of the conveyor. Specifically, the heating means for heating the atmosphere is composed of a far-infrared ray generator and a diffuse reflector installed in the irradiation direction. Further, as a heating means for heating the atmosphere, a blowing means for stirring the inside of the housing is provided.

[0007]

When packaged food such as kabayaki packed in a bag of synthetic resin or the like enters the inside of the casing by the conveyor, it is rapidly heated by the air heated to a high temperature before being conveyed by the conveyor. Then, after being transported, the far infrared rays generated from the far infrared ray generating means are bathed, and the whole is rapidly heated without unevenness, and the color of the drip adhering to the surface is restored. Further, as a result of the heating, the central portion of the fish body is heated relatively quickly, and as a result, the heating time is shortened and the amount of fish fat exuded from the inside is suppressed. Also,
Since heating by far infrared rays is heated to a temperature slightly lower than the secondary sticking temperature, a so-called secondary seal in which the front and back of a bag of synthetic resin or the like polymerized by a vacuum pack is inseparably adhered is avoided.

[0008]

The present invention will be described below with reference to the illustrated embodiments. In the figure, 10 is a secondary sterilizer for Z such as kabayaki. The secondary sterilizer 10 includes a housing 20 made hollow, a conveyor 30 housed therein, a far-infrared ray generating means 40, and a blower 12 for stirring the air inside the housing 20. The main part.

On the outer surface of the casing 20, there are provided a first blower 12a which is located on the upper side and horizontally blows inward in the longitudinal direction of the casing, and an inlet and a blower inside the casing 20. A large number of open circulation fans 12b, 12b and a downward fan 12c for blowing air from the top surface to the inside of the housing 20 are attached. 13 is an electric motor 13a supported on the top surface
It is a stirring fan driven by.

The casing 20 has a first frame 21a and a second frame 21 which are assembled by welding a steel material made of an angle material.
A frame 21 assembled by bolting (not shown) to b and a skin plate 2 attached so as to cover the outer surface thereof.
3 is provided. The skin plate 23 is bolted to the upper surface of the frame 21, and the side surface thereof is covered by a hinge 24 so that it can be opened upward. Reference numeral 25 is an exhaust pipe that opens the inside of the casing 20 upward, and the damper valve 2 is provided inside.
6 is provided. Reference numeral 27 is a level bolt screwed to the lower surface of the frame 21.

In this embodiment, the transfer conveyor 30 includes an entrance conveyor 30a and an intermediate conveyor 30a arranged vertically.
b, and the exit conveyor 30c. Each of the conveyors 30a, 30b, 30c is constituted by a conveyor belt 32 (32a, 32b, 32c) wound between guide rollers 31 (31a, 31b, 31c). Here, the conveyor belt 32 is a net made of thermosetting synthetic resin. Reference numeral 33 is a belt tensioner for preventing the conveyor belt 32 from being loosened. Reference numeral 34 is a belt driving means for driving these conveyor belts 32, which comprises an electric motor and a speed reducer. The belt drive means 34 includes a drive chain 35 and a guide roller 3.
1c through the conveyor belt 32 of the exit conveyor 30c
drive c.

Reference numeral 36 is a transfer roller for transferring the transferred objects from the entrance conveyor 30a to the middle conveyor 30b and from the middle conveyor 30b to the exit conveyor 30c. First replacement roller 36a for replacement
And a second transfer roller 36b for transferring from the middle conveyor 30b to the exit conveyor 30c. The auxiliary transfer belt 32d is wound around the first transfer roller 36a and the auxiliary roller 36c. In addition, the auxiliary conveyor belt 32d and the intermediate conveyor 30b
A relay chain 37 is connected to the guide roller 31b. In addition, 38 and 38 are the above-mentioned conveyor belts 3.
The return side of 2 is a support plate that supports so that it does not hang down, and at the same time, it prevents the far infrared rays emitted from the upper second infrared ray generating means 40b, which will be described later, from directly irradiating the entrance conveyor 30a.

Thus, when the belt driving means 34 is operated, the conveyor belt 32c wound around the drive chain 35 and the guide roller 31c is rotated. The conveyor belt 32c is the conveyor belt 32 of the middle conveyor 30b.
Along with b, it is wound around the second transfer roller 36b and is given tension by the belt tensioner 33, so that the conveyor belt 32b is rotated by frictional force. The conveyor belt 32b has a guide roller 31b.
The auxiliary roller 36c is rotated via the relay chain 37, and the first transfer roller 36a is rotated by the auxiliary transport belt 32d. Further, the first transfer roller 36a rotates the auxiliary conveyor belt 32d and the conveyor belt 32a of the entrance conveyor 30a wound around the outer periphery thereof.

The infrared ray generating means 40 is the inlet conveyor 3
The first infrared ray generating means 40a arranged on the lower surface of the transport belt 32a of 0a and the second infrared ray generating means 40b arranged above the exit conveyor 30c are installed. Each infrared ray generating means 40 includes a burner 41 and an exhaust fan 4
It is constituted by a substantially U-shaped heat generating tube 43 and the like configured to connect the two. The heat generating tube 43 is made by binding ceramic particles to the outer surface of a metal tube such as a steel tube or a stainless tube having an outer diameter of about 100 mm, and is suspended from the frame 21 by a band-shaped stay 44.

Combustion flame and combustion gas of 380 to 400 ° C. ejected from a burner 41 are sent into the metal tube forming the infrared ray generating means 40, and at the same time, the combustion gas is discharged to the outside of the housing 20 by an exhaust fan 42. Is discharged. In addition,
In this embodiment, the combustion gas is about 50 ° C. inside the housing 20.
Temperature drop occurs and its discharge temperature is about 330-350 ° C
Is.

The first infrared ray generating means 40a is mainly used for raising the internal temperature of the casing 20, and as shown in FIG. 3, a reflecting plate 45 is provided on the upper surface to radiate upward heat radiation. While blocking the light, a diffuse reflection plate 46 is provided on the lower surface so that far infrared rays are widely diffused inside the housing. The air heated by the diffusely reflected far-infrared rays is agitated by a large number of circulating fans 12b, 12b provided on both sides of the housing 20, and heats the atmosphere of the inlet conveyor 30a to a high temperature. Therefore, the first infrared ray generating means 40a is not an essential requirement in the configuration of the present invention, and can be replaced by another heating means (not shown).

The second infrared ray generating means 40b is installed after the conveyer 30 and is used mainly for obtaining a glossy (or shiny) appearance unique to Z such as bonito. That is, the second infrared ray generating means 40b avoids the upward irradiation by the reflecting plate 45 on the upper surface, and directly acts on the scallops Z or the like on the exit conveyor 30c arranged immediately below and temporarily ignites them. It prevents the taste components such as eel from escaping to the outside from the inside, and makes the outside surface glossy and shiny.

The operation of the secondary sterilization apparatus 10 will be described.
First, the preparation work is started to operate the device. That is,
The infrared ray generating means 40 is ignited and heated to about 400 ° C.,
Far infrared rays are emitted from the surface. At the same time, the first blower 12a, the circulation blower 12b, and the stirring fan 13 are operated to move the internal air along the longitudinal direction of the second infrared ray generating means 40b by the first blower 12a. First infrared ray generating means 40a
The air above the air is circulated in the width direction of the housing 20, and
The agitating fan 13 acts to make the internal atmospheric temperature uniform by pushing the upper air downward. When the temperature inside the housing 20 has risen excessively, a damper valve provided in the exhaust tube 25 is opened to discharge a part of the hot air to the outside to prevent the temperature from rising excessively.

From this state, when the vacuum-packed Zaki etc. is placed on the loading section provided near the right end of the entrance conveyor 30a in the figure, the casing 20 is moved leftward together with the conveyor belt 32a. Entrance conveyor 30 in the housing 20
In the vicinity of a, the air warmed by the lower first infrared ray generating means 40a is the circulation blower 12b and the stirring fan 1
A hot air atmosphere is created by being agitated by 3, and Z such as the above-mentioned calcination is heated from the surface by the atmosphere.
The first infrared ray generating means 40a on the lower side and the second infrared ray means on the upper side
Far-infrared rays are emitted from the infrared ray generating means 40b, so that the central portion such as eel is heated.

When Z, such as calcination, reaches the end of the inlet conveyor 30a, Z, etc., is sandwiched between the conveyor belt 32a and the auxiliary conveyor belt 32d wound around the first transfer roller 36a, and the first transfer is performed. It is wound up to the upper side of the roller 36a, turned upside down and transferred to the auxiliary transport belt 32d, and is then transported to the right by the auxiliary transport belt 32d and transferred to the intermediate conveyor 30b. While moving from the left to the right on the middle conveyor 30b, Z such as kabayaki receives the hot air sent from above by the stirring fan 13 and the hot air rising from below by convection, and further passes through the mesh of the outlet conveyor 30c. The far infrared rays emitted from the irradiated second infrared ray generating means 40b are received to further advance the heating.

When Z such as kabayaki reaches the end of the intermediate conveyor 30b, Z is sandwiched between the conveyor belt 32b wound around the second transfer roller 36b and the conveyor belt 32c of the exit conveyor 30c. (2) The transfer roller 32b is wound up to the upper side of the transfer roller 36b, and then is turned upside down again to be transferred to the transfer belt 32c and then transferred from right to left. During this time, the second infrared ray generating means 40 above
From b, far infrared rays directly act on Z such as calcination for finishing, and at the same time, hot air in the vicinity of the second infrared ray generating means 40b is sent downward by the stirring fan 13 to heat Z by calcination.

Eventually, Z such as kabayaki reaches the take-out portion at the left end which is the end of the exit conveyor 30c located outside the housing 20, and is taken out to the outside. In this embodiment, the housing 2
The atmosphere temperature inside 0 is about 100 ° C., and after being introduced into the introduction section of the entrance conveyor 30a, the exit conveyor 3
It takes about 3 minutes and 30 seconds to reach 0c. Then, Z such as kabayaki which is charged at room temperature rises to about 80 ° C. in the meantime. In other words, when the temperature of Z such as broiled rice rises higher than this and rises to around 100 ° C., for example, the temperature will be the temperature (re-fusion temperature) at which the front and back of a bag made of synthetic resin for packaging eel etc. will be fused. Since they approach each other, the speed of the conveyor 30 is adjusted and the damper valve 26 is opened / closed to avoid an excessive temperature rise.

As described above, Z such as kabayaki is sterilized in the inlet conveyor 30a and the intermediate conveyor 30b at a relatively low temperature centering on being heated by the surrounding air. After that, in the exit conveyor 30c, since far infrared rays emitted from the second infrared ray generating means 40b are directly irradiated as finishing heating, and are ignited in a short time,
Only the very thin part of the surface hardens and prevents the internal fish fat from leaching to the surface. Therefore, not only is it possible to prevent the deterioration of the taste of Z such as kabayaki and the deterioration of the appearance,
The strong heat restores the color of the surface of the eel and other sauce, increasing the value of the surface such as kabayaki.

[0024]

As described above, according to the above method invention,
Secondary sterilization can be performed without deteriorating the taste and appearance of Z such as kabayaki. Further, according to the apparatus invention, there is an effect that heating in the atmosphere and heating in the far infrared rays can be sequentially and effectively performed on Z such as broiled rice.

[Brief description of drawings]

FIG. 1 is a front view of a secondary sterilizer showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a right side view of FIG. 1 with a part thereof cut away.

FIG. 4 is a left side view of FIG.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a plan view corresponding to FIG. 2 with the outer plate removed.

FIG. 7 is a process drawing showing the manufacturing process of broiled oyster.

[Explanation of symbols]

 10 ... Secondary sterilizer 12 ... Blower 12a ... First blower 12b ... Circular blower 12c ... Downward blower 13 ... Stirring fan 13a ... Electric motor 20 ...・ Case 21 ・ ・ ・ ・ Frame 21a ・ ・ ・ First frame 21b ・ ・ ・ Second frame 23 ・ ・ ・ ・ Outer skin 24 ・ ・ ・ ・ Hinge 25 ・ ・ ・ ・ Exhaust pipe 26 ・ ・ ・ ・ Damper Valve 27 ... Level bolt 30 ... Conveyor conveyor 30a ... Inlet conveyor 30b ... Middle stage conveyor 30c ... Exit conveyor 31 (31a, 31b, 31c) ... Guide roller 32 (32a) , 32b, 32c) ··· Conveyor belt 32d ··· Auxiliary conveyor belt 33 ··· Belt tensioner 34 ··· Belt driving means (electric motor and reducer) 35 ··· Drive chain 3 (36a, 36b) ... Replacement roller 36a ... First replacement roller 36b ... Second replacement roller 36c ... Auxiliary roller 37 ... Relay chain 38 ... Support plate 40 (40a, 40b) ... Infrared generating means 40a ... First infrared generating means 40b ... Second infrared generating means 41 ... Burner 42 ... Exhaust fan 43 ... Heating tube 44 ... Stay 45 ... Reflector plate 46 ... Diffuse reflector Z ... Kabayaki

Claims (6)

[Claims] 1. A method for secondary sterilization of a packaged food, which comprises packaging the packaged food in a bag made of a synthetic resin film and irradiating with far infrared rays to heat the packaged food at a temperature slightly lower than the readhesion temperature of the bag for a short time. 2. A method for secondary sterilization of packaged food, which comprises heating the packaged food by a conveyor to heat it, and irradiating it with far infrared rays to finish heating it after the conveyor. 3. A transport conveyor for transporting packaged food packed in a bag made of synthetic resin or the like is provided inside the housing, and heating means for heating the atmosphere is provided at the front stage of the transport conveyor and is also used for post-transport. A secondary sterilizer for packaged food, comprising far-infrared ray generating means oriented on a conveyor belt of a conveyor. 4. The secondary sterilizer for packaged food according to claim 3, wherein the heating means for heating the atmosphere comprises a far-infrared ray generator and a diffuse reflector installed in the irradiation direction. 5. The secondary sterilizer for packaged food according to claim 3, further comprising, as a heating means for heating the atmosphere, a blowing means for stirring the inside of the housing. 6. The secondary sterilizer for packaged food according to any one of claims 1 to 5, wherein the packaged food is white roast or teriyaki kabayaki.