JPH07155121A - Packaging of aseptic rice cooked in container - Google Patents

Abstract

PURPOSE:To obtain a method for the cooking of aseptic rice in a container, effective for preventing the secondary contamination caused by the contact of cooked rice with air and a machine and reducing the cost of the container. CONSTITUTION:Washed rice subjected to aseptic treatment and water for rice cooking are fed into a primary container continuously formed by a deep-drawing container-forming machine and having a thickness of about 150mum, sealed with a film having several number of steam-ejection holes and successively transferred to a rice cooking machine and a steaming machine to effect the cooking of the rice. After finishing the rice cooking, the primary container is successively transferred to an aseptic clean room and put as it is in a secondary container formed with an oxygen-barrier material using a deep-drawing container forming machine. The container has a thickness of about 150mum and a size to hold the primary container. The secondary container is evacuated, filled with an inert gas, sealed and cooled to obtain the packaged rice.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cooking sterilized cooked rice, which prevents secondary contamination of the cooked rice due to air or mechanical contact in the process of producing sterilized cooked rice and reduces the container cost.

[0002]

2. Description of the Related Art A large amount of conventional sterilized cooked rice is cooked with a commercial continuous kettle rice cooker or a continuous steam rice cooker, then the volume of the cooked rice is weighed in a clean room and the upper surface of the container is sealed. ing. For example, as shown in FIGS. 4 and 5, after the rice is sent from the rice storage tank 40 to the rice washing machine 41 by a conveyor to wash the rice, the rice is passed through the dipping tank 42 and then placed in the pot 45 mounted on the conveyor 44 of the steam rice cooker 43. A fixed amount of washed rice and water are sequentially added, and the rice is cooked while passing through the steam rice cooker 43, and the cooked rice is placed directly on the conveyor 47 of the clean room 46 by reversing the pot 45, and the capacity measuring and filling machine. It is thrown into 48. On the other hand, while the roll film 49 is rewound and the container 53 to be molded through the molding machine 50 is sequentially sent out by the conveyor 51, the capacity is measured under the outlet of the capacity metering and filling machine 48, and a fixed quantity of cooked rice is containerized. 53
Roll film 3 while degassing in a vacuum degassing chamber 54
8 is rewound to seal the upper surface of the container, and then the inert gas is filled in the inert gas filling chamber 55, and the finished product 39 is shipped by the conveyor 52. In addition, instead of using the pot 45, the washed rice containing water is continuously placed directly on the conveyor 44 to cook the rice.

In the above-mentioned conventional method for cooking sterilized cooked rice, since the washed rice is put in a kettle or placed directly on a conveyor to cook the rice, the cooked rice adheres to the kettle or conveyor or spills again. There is a lot of loss.

Also, there are many places where cooked rice adheres, such as a pot, a conveyor, and a filling machine, and when manufacturing sterilized cooked rice, these cooked places are thoroughly washed and a sterilizer is used every time the work is finished. Since it is used for sterilization, it consumes a lot of work time and a large amount of water, resulting in large economic loss.

As described above, in the conventional method of cooking sterilized cooked rice, the cooked rice adheres to the pot, the conveyor, the filling machine, etc., so that the cooking efficiency cannot be improved and the manufacturing cost cannot be reduced. is there. For the purpose of eliminating these drawbacks, the present applicant has invented a method for cooking aseptic cooked rice by cooking rice in a container containing sterilized washed rice as a product (Japanese Patent Application No. 5-284506). , Japanese Patent Application No. 5-2845
09).

[0006] The cooked rice container used in the conventional method for cooking sterilized cooked rice has a thickness of 600 to 800 microns, and the material cost is considerably high.

[0007]

Therefore, according to the present invention,
The manufacturing process simplifies the steps such as taking out rice, weighing and filling, minimizing secondary work such as washing, cleaning, sanitation, and almost no filling loss or adhesion loss. Minimize cross-contamination due to contact, and replace conventional 600-800 micron thick containers with
The total thickness of the primary container and the secondary container is reduced to about 300 μm to reduce the manufacturing cost.

[0008]

In order to achieve the above-mentioned object, the method of cooking sterilized cooked rice according to the present invention comprises continuously sterilizing washed sterilized rice and water for cooking with a deep-drawing container molding machine. Fill a primary container with a thickness of about 150μ,
After sealing with a film that has several steam outlets, load the rice in a rice cooker / steamer one after another to cook the rice, and then take out the primary container after the rice is cooked into a clean room in a sterile state, and then in the clean room, The cooked primary container was stored as it was in a secondary container having a thickness of about 150 μ, which was formed by a squeezing container forming machine into a size capable of containing the primary container with a material having an oxygen barrier property, and vacuum deaeration was performed. Then fill with inert gas, seal and cool.

[0009]

[Function] As for sterilized rice and water for cooking, once packed in a primary container, the series of steps from rice cooking to product shipment is automatically performed without transferring to another container. The cooked rice can be efficiently cooked, and there is no sticking of cooked rice to the device, so it is easy to clean up after cooking and the work time can be shortened and the consumption materials can be saved.

Since the rice cooking container is divided into a primary container and a secondary container, both of which are thin and have a thickness of about 150 μ, and the oxygen barrier film may be used only in the secondary container. The material cost of the container can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. In the sterilization process before cooking rice, for example, as shown in FIG. 1, the rice cut out from the rice storage tank 1 is loaded into the rice washing machine 3 by the conveyor 2. The rice washing machine 3 is equipped with a jet bubble generating device, and the washing water to be used is rice water that has been subjected to pie water or ceramic treatment by the water treatment device 4 and has a water cluster number of about 10.
Bacteria such as bran, oil, and Bacillus bacteria that have adhered to the surface of rice grains are peeled and removed by washing rice using the jet bubbles.

The washed rice is sent to the dipping tank 5, and the dipping tank 5 is charged with water treated by the water treatment device 4 and a PH adjusting liquid and an antibacterial agent from the PH adjusting liquid tank 6. This P
The H adjustment liquid is, for example, protamine: 0.5%, glycine:
5.0%, glucono delta lactone 5.0%, glacial acetic acid:
2.0%, citric acid anhydride: 4.0%, gluconic acid: 4.
A composition such as 0% and water: 80.5% is used. While soaking in the dipping tank 5, bacteria such as Pacillus bacteria remaining in the washed rice are further stripped and removed. Then, the sterilized washed rice is sent to the weighing machine 8 by the conveyor 7.

On the other hand, a rice cooker 15 is provided below the weighing machine 8.
Chain conveyor 13 is installed toward the entrance of
A molding machine 11 is provided at the other end of the chain conveyor 13, and the film unwound from the roll film 10a having a film thickness of about 150 μ is passed through the molding machine 11 to continuously mold the primary container 12. And sequentially flow on the chain conveyor 13.

When the primary container 12 faces below the outlet of the weighing machine 8, a predetermined amount of washed rice is continuously weighed by a predetermined amount by the weighing machine 8 and a predetermined amount by the water supplier 9. The primary container 12 is continuously filled with rice cooking water suitable for washing rice and moved by the chain conveyor 13. Then, while being moved, the film unwound from the roll film 10b having the same film thickness as described above is transferred to the primary container 12
It is supplied to the upper side to seal the upper surface, and the connecting portion of the front and rear containers is cut by the cutter 14. The sealing film has a plurality of steam outlets for discharging steam.

The primary container 12 packed with the sterilized washed rice is
Cook rice with a large rice cooker 15 and then steamer 16
After being steamed by, it is sent to a clean room 19, where the primary container 12 is placed in a secondary container 22, deaerated, filled with an inert gas and sealed to finish.

The clean room 19 is provided with a chain conveyor 23 over the entire length from the entrance side to the exit side.
A molding machine 21 is provided near the entrance, and the roll film 20a has a film thickness of about 150 μm and has an oxygen barrier property.
The film unwound from the sheet is passed through a molding machine 21, a secondary container 22 is continuously molded, and sent out by a chain conveyor 23. On the other hand, the cooked primary container 12 exits the steamer 16 and is sent to the clean room 19 by the chain conveyor 18 and stored in the secondary container 22 on the chain conveyor 23. Secondary container 2 containing the primary container 12
2 is moved by a chain conveyor 23 to move to a vacuum degassing chamber 24
At this time, vacuum degassing is performed, and at the same time, a film rewound from the roll film 20b having the same film thickness as the above and having an oxygen barrier property is supplied onto the secondary container 22 and the container is filled with an inert gas. The upper surface is sealed, and the cutter 25 cuts the connecting portions of the front and rear containers to finish. The finished product 26 is shipped by the chain conveyor 27.

The rice cooker 15 and the steamer 16 are the primary containers 12 continuously fed by a chain conveyor.
Any device can be used as long as it can process the above. As an example of the rice cooker, FIG. 3A shows a steam rice cooker 15a, and FIG. 3B shows a convection steam rice cooker 15b.

In the steam rice cooker 15a, a plurality of sprocket shafts having a pair of left and right sprockets 29 are arbitrarily arranged at intervals so that the hanging tray 28 can be interposed, and the endless chain 30 is installed on the left and right sprockets 29. The frame of the hanging tray 28 is swingably supported by a support shaft formed by projecting the connecting pin inwardly, and the sprocket 29 is driven, so that a large number of hanging trays 28 move from the inlet side to the outlet side. The rotation speed of the sprocket 29 is adjusted so that the time taken for one hanging tray 28 to reach from the inlet to the outlet is the required rice cooking time (about 30 to 40 minutes). A plurality of steam injection nozzles 32 connected to the steam generator 31 by a steam pipe are installed on the inlet side wall of the steam rice cooker 15a.

100 to 110 ° C. from the steam injection nozzle 32
The primary container 12 sent to the inlet by the chain conveyor 13 is pushed out by a pusher (not shown) and placed on the hanging tray 28 while keeping the inside of the machine at the rice cooking temperature. Then, rice is cooked while moving by rotation of the chain, pushed out by the pusher 33 when reaching the outlet, and the primary container 12 containing the cooked rice is placed in the chain conveyor 34 provided between the steamer 16 and the steamer 16. It is placed and carried to the steamer 16.

The convection steam rice cooker 15
b is the primary container 12 via the rack storing trolley 35.
Accept. That is, a predetermined number of primary containers 12 are automatically stored in the rack shelf 37 in the rack storage trolley 35 by the pusher 36. Then, the rack storage trolley 35 is automatically put into the convection steam rice cooker 15b by a device (not shown) and the door is closed, then saturated steam is generated to keep the internal pressure at 10 to 50 mmAg, and at 100 to 110 ° C. Cook steam rice at the temperature of about 30-40 minutes.

After cooking rice, the primary container 12 is automatically taken out via the rack storage trolley 35, and is dispensed by the pusher 36 to the chain conveyor 34 provided between the steamer 16 and the steamer 16.

The steaming machine 16 has a structure similar to that of the steam rice cooker 15a, and the structure is such that steaming is performed while the inside of the steaming rice cooker 15a is kept at 90 to 120 ° C. for about 3 to 10 minutes, or an output of 100 W. An apparatus having a structure in which steaming is performed while being phased by a microwave of ~ 200 W at a temperature of 100 to 120 ° C for 1 to 5 minutes is used.

[0023]

Industrial Applicability According to the present invention, once the sterilized washed rice is put in the primary container, it is cooked and steamed without being transferred to another container, and then stored in the secondary container as it is, and the inert gas is stored. Since the container is filled and sealed, it is possible to use a thin film, which is inexpensive, by duplicating the container, and it is possible to reduce the overall manufacturing cost by reducing the container price. In addition to preventing secondary contamination of cooked rice due to air or mechanical contact, it is possible to obtain great economic effects such as improving yield and improving working environment.

[Brief description of drawings]

FIG. 1 is an example of an apparatus for carrying out the method for cooking sterilized cooked rice according to the present invention, which includes washing rice, forming a primary container and a rice cooker
It is explanatory drawing which shows the outline of the equipment to a steamer.

FIG. 2 is an explanatory diagram showing an outline of a clean room provided after the rice cooker and the steamer of FIG.

FIG. 3 is an explanatory view showing a specific example of the rice cooker in FIG.
The figure (A) is a steam rice cooker, and the figure (B) is a convection steam rice cooker.

FIG. 4 is an explanatory diagram showing an outline of a rice cooker and a rice cooker in an example of a conventional cooked rice cooker.

5 is an explanatory diagram showing an outline of a clean room provided with a container forming machine provided after the rice cooker of FIG. 4, a capacity measurement of cooked rice, and an inert gas filling chamber.

[Explanation of symbols]

 1 Rice Storage Tank 2, 7, 13, 18 Chain Conveyor 3 Rice Washer 4 Water Treatment Device 5 Immersion Tank 6 PH Adjusting Liquid Tank 8 Measuring Machine 9 Water Supply Device 10a, 10b Roll Film 11 Forming Machine 12 Primary Container 14, 25 Cutter 15a, 15b Steam rice cooker 16 Steaming machine 17 Primary container 19 after cooking rice 19 Clean room 20a, 20b Oxygen barrier roll film 21 Forming machine 22 Secondary container 23, 27 Chain conveyor 24 Vacuum deaeration chamber 26 Product 28 Hanging plate 29 Sprocket 30 Endless chain 31 Steam generator 32 Steam injection nozzle 33, 36 Pusher 34 Chain conveyor 35 Trolley for rack storage 37 Rack shelf 38 Roll film 39 Product 40 Rice storage tank 41 Rice washing machine 42 Dipping tank 43 Steam rice cooker 44, 47, 51, 52 Conveyor 45 Pot 46 Lean room 48 Volume measuring and filling machine 49 Roll film 50 Forming machine 53 Container 54 Vacuum degassing chamber 55 Negative active gas filling chamber

Claims (1)

[Claims] 1. Washing rice and water for cooking, which have been sterilized,
Thickness 150 continuously molded by deep drawing container molding machine
After filling a primary container of about μ and sealing it with a film that has several steam outlets, sequentially load it into a rice cooker / steamer to cook rice, and the primary containers that have finished cooking rice are sequentially placed in a sterile clean room. In the clean room, a primary container that has been cooked into a secondary container having a thickness of about 150 μm, which is molded into a size capable of accommodating the primary container with a material having an oxygen barrier property by a deep-drawing container molding machine, Is stored as it is, degassed in vacuum, filled with inert gas, sealed, cooled, and finished.