JP2690714B2 - Manufacturing method of processed rice for chazuke and microwave heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing processed rice for chazuke, which is used as a cup of chazuke, which is a type of instant food, and a microwave heating device used for this production method.

[0002]

2. Description of the Related Art In recent years, various foods such as noodles and miso soup have been used as instant foods that can be eaten only by pouring hot water, and Japanese food such as Ochazuke is also targeted.

[0003] Processed rice for ochazuke must be made ready to be eaten simply by pouring hot water as described above as an instant food, and therefore must be processed and stored immediately before it. There was such a problem.

[0004]

[Problems to be Solved by the Invention] That is, when eating ordinary Ochazuke, it is sufficient to put dried plums, salted salmon, seaweed, etc. on cooked rice and pour in hot water. If you just put it in a container and pour hot water into it as an instant food, the flavor is not good and it is not delicious. When storing rice for Ochazuke in a retort container and eating it as an instant food, it is better to have Ochazuke with a certain amount of water. In that case, how much processing is required to maintain the flavor? It is unclear.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for producing processed rice for tea pickling, which can be eaten deliciously without spoiling the flavor simply by pouring hot water. Another object of the present invention is to provide a microwave heating device which is a convenient heat treatment device used in this manufacturing method.

[0006]

In order to solve the above problems, the method for producing processed rice for tea pickling according to the present invention is to wash mixed rice of a plurality of brands of polished rice and then soak it in water to adjust the water content to 32 to. It is adjusted to about 33% by weight, and after removing water adhering to the surface, the mixed rice is subjected to microwave irradiation, further immersed, then drained and steamed to absorb water at a water content of about 60%. To do.

Further, the microwave heating apparatus of the present invention used in this manufacturing method conveys a heating oven to which a large number of microwave oscillators are attached and a large number of rice loading trays covered with a heating cover to convey the inside of the heating oven. It was equipped with a conveyor to pass through and a heating cover transfer means for removing the heating cover from the rice loading tray after passing through the outlet of the heating oven and transferring the heating cover up to the front of the inlet of the heating oven to cover the rice loading tray. Characterize. Furthermore,
Desirably, after passing through the outlet of the heating oven, the rice loading tray from which the heating cover has been removed is covered with a vacuum cover to perform vacuum cooling, and after vacuum cooling, the rice loading tray from which the vacuum cover has been removed is removed from the conveyor and inverted. And a tray reversing transfer machine for returning to the conveyor again.

[0008]

According to the above-mentioned means, the mixed rice is heated by microwave to convert about 90% of the starch into α, so that the digestion,
Processed rice for chazuke that has good absorbency can be obtained. In particular, if the mixed rice is washed before microwave heating and immersed in water to adjust the water content to about 32 to 33% by weight, the starch is efficiently gelatinized by microwave heating. Also, when the mixed rice is piled up on the rice loading tray by the means and placed on the conveyor, the heating cover is transferred to the rice loading tray by the heating cover transfer means when the rice loading tray is conveyed to just before the entrance of the heating oven. To be Then, while the rice loading tray is conveyed by the conveyor and passes through the inside of the heating oven, the microwaves emitted from a number of microwave oscillators heat the mixed rice in the rice loading tray,
Most of the starch is gelatinized. This microwave heating is efficiently performed because the rice loading tray is covered with the heating cover. When the rice loading tray emerges from the outlet of the heating oven, the heating cover transfer means removes the heating cover from the rice loading tray, and the heating cover is transferred to just before the inlet of the heating oven and is still being heat treated. Not covered with rice loading tray.

Further, according to the above means, a vacuum cover is placed on the rice loading tray from which the heating cover has been removed after passing through the outlet of the heating oven, and the mixed rice (microwave) is fed while the rice loading tray is conveyed by the conveyor. The heated mixed rice) is cooled in vacuum and the temperature drops to around room temperature. When the vacuum cooling is completed and the vacuum cover is removed, the tray inverting and transferring means takes out the rice loading tray from the conveyor, reverses it by 180 degrees and turns it over, and then returns it to the conveyor again. When the rice loading tray is thus inverted, the mixed rice falls from the rice loading tray and is collected by the collecting hopper or the like arranged below.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram of a step of primary processing of the method for producing processed rice for tea pickling according to the present invention, and FIG. 2 is a block diagram of a step of further processing the primary processed rice.
3 and 4 are a plan view and a front view showing an embodiment of the microwave heating apparatus of the present invention.

In this method for producing processed rice for chazuke, first, in the mixing section 1, for example, Koshihikari polished rice and other general other polished rice are mixed at a weight ratio of 50%. In this case, the rice type (brand) may be a mixture of other varieties (for example, Akita Komachi, Hitomebore, Sasanishiki, etc.). Next, in the rice washing section 2, the mixed rice thus mixed is washed using a rice washing machine with water treatment. In the examples, the processing time was 600 Kg / hour. And the mixed rice washed is soaked in 3
In this case, the dipping time is 120% for mixed rice with a moisture content of about 15% in the washed rice before dipping.
The water content can be set to 32% to 33% by adjusting the amount. Further, the mixed rice soaked is dehydrated by a dehydrator such as a centrifugal separator in order to remove water adhering to the surface of the rice in the dehydrating section 4, and is transferred to the next microwave heating step.

The mixed rice that has been dehydrated by a dehydrator such as a centrifuge is disc-shaped in a container (a rice loading tray 34, which will be described later) that is resistant to micro irradiation in the molding section 5 of the microwave heating device, which will be described later. Mold and put. Then, the microwave is irradiated to the mixed rice in the microwave irradiation unit 6 of the microwave heating device. In this embodiment, the operation is performed in a container (rice loading tray 34) which moves on a conveyor (rice loading tray 34). And passed through a tunnel-shaped heating oven 25 in which 36 microwave oscillators 26 (described later) are continuously arranged for 25 minutes and 12 seconds, and heat-treated.
In this step, about 90% of rice starch can be gelatinized. Also, the water content is initially 32
% To about 33% (weight%) can be adjusted to about 25%. The details of the microwave heating device will be described later.

Next, the vacuum cooling unit 7 of the microwave heating device
The processed rice produced by heat treatment (described later) has an initial product temperature of 8
Since the temperature is as high as 7 ° C, it is cooled to about 25 ° C by a vacuum cooler. Further, the cooled mixed rice (processed rice) is separated and loosened one by one in the loosening unit 8 and transferred to the next secondary processing step. The primary processed rice can be weighed by the weighing unit 9 and used for other dishes. In such a case, the bag is weighed and stored in a bag together with an oxygen scavenger at 3 kg to 5 kg.

In the secondary processing step shown in FIG. 2, the primary processed rice loosened in the loosening portion 8 is dipped in a dipping portion 10 containing a 0.2% citric acid solution for about 30 minutes. Then, the soaked rice is drained for about 10 minutes by a centrifugal separator in the draining section 11,
Cook for 25 minutes at a temperature above ° C. After this steaming is completed, the rice is taken out, and the rice is soaked for 5 minutes in the water absorbing part 13 containing a 50% to 60 ° C eco-gum 0.2% solution to absorb water. It will be about 60%. The filling unit 14 packs the rice having a water content of about 60% in a retort bag, and the sterilizing unit 15 further 120 ° C.
Sterilize for 20 minutes.

According to the method for producing processed rice for tea pickling according to the present invention constituted by the above-mentioned primary processing and secondary processing, about 90% of the starch of the mixed rice is gelatinized, and the flavor is obtained by pouring hot water taken out from the retort bag. It becomes rich and delicious rice for chazuke. In addition, this processed rice is a processed rice having good digestion and absorption.

Next, a microwave heating apparatus provided with the molding unit 5, the microwave irradiation unit 6, the vacuum cooling unit 7 and the like in the above primary process will be described. The mixed rice in the primary step is washed with water using a rice washing machine as described above, and further immersed in a water tank for 120 minutes in the immersion section 3 to have a water content of 32 to 33% by weight.
Although the water content was adjusted to such an extent, such adjustment has the advantage that the gelatinization of starch is efficiently performed by microwave heating, which will be described later. After the end of the immersion of the mixed rice, the water adhering to the surface of the rice grains is removed using a centrifugal dehydrator, and the rice is moved to the next microwave heating step.

Microwave heating of mixed rice is carried out as shown in FIGS.
This is automatically performed using the microwave heating device shown in FIG.
In other words, the microwave heating apparatus has a rice loading tray 34 for forming a disc-shaped dehydrated mixed rice corresponding to the forming section 5 in FIG.
Are arranged in large numbers. And many rice loading trays 3
4 are installed on a number of pallets 24a arranged on a conveyor 24 provided in a square loop. A heating oven 25 is provided in a U-shape so as to cover almost the left half conveyor 24. A large number of microwave oscillators 26 and respective power supply units 27 are provided on a top plate and side plate portions of the heating oven 25. Is installed. The heating oven 25 and a number of microwave oscillators 26 correspond to FIG.
Corresponds to the microwave irradiation unit 6. As the microwave oscillator 26, for example, an air-cooled magnetron 2M
137 using an oscillation frequency of 2460 MHz and an output of 1.2
KW's are used.

An outer shutter 28a and an inner shutter 28b are provided at the entrance of the heating oven 25 to minimize heat radiation, and are opened and closed alternately by cylinders 29a and 29b. Similarly, an outer shutter 30a and an inner shutter 30b are provided at the outlet of the heating oven 25, and are alternately opened and closed by cylinders 31a and 31b.

A heating cover transfer means 32 is provided between a position past the exit of the heating oven 25 and a position just before the entrance. The heating cover transfer means 32 is provided with a rice loading tray 34 at a position past the outlet of the heating oven 25.
The heating cover 33 is removed from the heating oven 33, and the heating cover 33 is transferred to the front of the entrance of the heating oven 25 to cover the unheated rice loading tray 34. Specifically, the heating cover 33 is installed in front of the entrance of the heating oven 25. The first heating cover transfer machine 32a, the second heating cover transfer machine 32b installed just after the exit, and both transfer machines 32a, 3
It is composed of a roller conveyor 32c connecting the 2b. Each of the first and second heating cover transfer machines 32a and 32b includes a holder 32d for holding the heating cover by suction,
The screw rod 3 screwed into the screw cylinder 32e of the holder 32d
2f and a motor 32g for rotating the screw rod 32f
And two guide rails 32h for sliding the holder 32d.
When f is rotated, the holder 32d is moved to the guide rail 32h.
Is configured to move along. Therefore, when the rice loading tray 34 covered with the heating cover 33 comes out of the outlet of the heating oven 25 as described later, first, the holder 32d of the second heating cover transfer machine 32b causes the heating cover 3 to move.
3 is held by suction, and the holder 32 is rotated by rotation of the screw rod 32f.
d moves to the roller conveyor 32c and moves to the heating cover 33
Is placed on the roller conveyor 32c, and then the roller conveyor 32c carries the heating cover 33 to the first heating cover transfer machine 32a, and furthermore, the heating cover 33 is held by the holder of the first cover transfer machine 32a. 32d is sucked and held, and is moved to a position just before the entrance of the heating oven 25 by the rotation of the screw rod 32, so that the heating cover 33 can be put on the unheated rice loading tray 34.

The microwave heating apparatus of this embodiment is further provided with a cooling means 35 corresponding to the above-mentioned vacuum cooling section 7 in FIG. 1 and a tray reversing transfer machine 36. The cooling means 35 is for vacuum-cooling the rice loading tray 34 from which the heating cover 33 has been removed by covering the rice loading tray 34 with a vacuum cover 35a. More specifically, a vacuum cover transfer machine which transports the vacuum cover 35a and covers the rice loading tray 34 35
b, and a vacuum branch tank 35d for sucking air from the vacuum cover 35a via the suction hose 35c.

The vacuum cover transfer machine 35b has a structure substantially similar to that of the heating cover transfer machine described above.
The holder 35e sucks and holds the vacuum cover 35a which has been vacuum-cooled, and the screw rod 35 driven by the motor 35f.
Move along the guide rail 35h with the rotation of g,
Vacuum cover 35 on the US transfer tray 34 before vacuum cooling
a can be put on.

The tray reversing transfer machine 36 is substantially the same as the above heating cover transfer machine or vacuum cover transfer machine except that the holder 36a for sucking and holding the rice loading tray 34 is reversed by 180 degrees. Has a similar structure to
The rice loading tray 34 is moved to the conveyor 24 by the holder 36a.
It is possible to take it out from the machine, invert it by 180 degrees, and then return it to the conveyor 24. A collecting hopper or the like (not shown) is provided below the tray reversing transfer machine 36.
Is installed.

When the microwave heating device having the above-mentioned structure is used, a fixed amount (usually about 5 kg) of mixed rice is molded into a disc shape and loaded on the rice loading tray 34, and the rice loading tray 34 is started. By simply placing the mixed rice on the rectangular pallet 24a of the conveyor 24 at the point A, the mixed rice can be automatically microwave-heated and then cooled to be collected.

That is, when the rice loading tray 34 is placed on the rectangular pallet 24a of the conveyor 24 and conveyed in the clockwise direction, when the rice loading tray 34 is conveyed to the front of the entrance of the heating oven 25, the heating cover transfer means 32 is provided. The heating cover 33 is placed on the rice loading tray 34 by the first transfer machine 32a. Then, while the outer shutter 28a and the inner shutter 28b at the entrance of the heating oven are alternately opened and closed so that the rice loading tray 34 enters the heating oven 25 and passes through the inside thereof, microwaves emitted from a number of microwave oscillators 26 are irradiated. As a result, the mixed rice in the rice loading tray 34 is heated, and most of the starch is converted into α. This microwave heating is efficiently performed because the heating cover 33 covers the rice loading tray 34. In that case, during the time when the rice loading tray 34 passes through the heating oven 25, that is, the time when microwave heating is performed, the output of the microwave oscillator 26 and the oscillation frequency are set so that about 90% of the starch of the mixed rice is converted into α. Therefore, it is necessary to adjust the conveying speed of the conveyor 24 in advance so that the rice loading tray 34 can pass through the heating oven 25 at the specified time.

When the rice loading tray 34 comes out of the outlet of the heating oven 25, the heating cover 33 is moved by the second transfer machine 32b of the heating cover transferring means 32.
As described above, the heating cover 33 is transferred to a position before the entrance of the heating oven 25 by the roller conveyor 32c and the first transfer machine 32a, and is covered on the rice loading tray 34 before the heating process.

A vacuum cover 35a is covered by a vacuum cover transfer machine 35b on the heat-treated rice loading tray 34 from which the heating cover 33 has been removed, and the inside air is conveyed while the rice loading tray 34 is conveyed by the conveyor. Is sucked by the vacuum branch tank 35d, the mixed rice (mixed rice heated by microwave) is cooled in vacuum, and its temperature is lowered from around 87 ° C to around 25 ° C. When the vacuum cooling is completed, the vacuum cover 35a is removed by the vacuum cover transfer device 35b before the tray reversing transfer device 36, and the vacuum cover is transferred to and covered with the rice loading tray before vacuum cooling.

The cooled rice loading tray 34 from which the vacuum cover 35a has been removed is conveyed to the tray reversing transfer machine 36, and as described above, the rectangular pallet 24 of the conveyor 24.
After being taken out from a and inverted by 180 degrees, it is returned to the rectangular pallet 24a. Thus, the rice loading tray 3
When 4 is reversed, mixed rice (mixed low-protein rice heated by microwave heating and vacuum cooling) drops from the rice loading tray 34,
It is collected by a collecting hopper or the like arranged below.

[0029]

EFFECTS OF THE INVENTION As is clear from the above description, according to the method for producing processed rice for chazuke of the present invention, the processed rice used for cup-chazuke can be made into a delicious and delicious rice for chazuke. The rice processed by this method for producing processed rice for chazuke has good digestion and absorbability because about 90% of starch is converted into α by microwave heating. Further, according to the microwave heating apparatus of the present invention, the mixed rice can be fully automatically microwave-heated to efficiently convert the starch into alpha, and in particular, the one equipped with the cooling means and the tray inversion transfer means is After the wave heating, it is possible to obtain an effect that it is efficiently cooled in vacuum to lower the temperature to around room temperature and can be automatically collected.

[Brief description of the drawings]

FIG. 1 is a block diagram of steps of an example of primary processing of a method for producing processed rice for tea pickling according to the present invention.

FIG. 2 is a block diagram of a process of an example in which the processed rice that has been primarily processed in the method for manufacturing processed rice for tea pickling according to the present invention is further subjected to secondary processing.

FIG. 3 is a plan view showing an embodiment of the microwave heating apparatus of the present invention.

FIG. 4 is a front view showing an embodiment of the microwave heating apparatus of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Mixing part 2 Rice washing part 3 Dipping part 4 Dehydration part 5 Molding part 6 Microwave trading company part 7 Vacuum cooling part 8 Relaxing part 9 Measuring part 10 Dipping part 11 Draining part 12 Steaming part 13 Water absorption part 14 Filling part 15 Sterilization part 24 Conveyor Reference Signs List 25 heating oven 26 micro oscillator 32 heating cover transfer means 32a first heating cover transfer machine 32b second heating cover transfer machine 32c roller conveyor 33 heating cover 34 rice loading tray 35 cooling means 35a vacuum cover 35b vacuum cover transfer Loading machine 35d Vacuum branch tank 36 Tray reversing transfer machine

Claims (3)

(57) [Claims] 1. Washing mixed rice of a plurality of brands of polished rice and immersing it in water to adjust the water content to about 32 to 33% by weight, removing water adhering to the surface, and then irradiating the mixed rice with microwaves. Then, dip it further, drain it, and steam it to reduce the water content to 6
A method for producing processed rice for tea pickling, which comprises absorbing about 0% of water. 2. A heating oven to which a large number of microwave oscillators are attached, and a conveyor which conveys a large number of rice loading trays covered with a heating cover and passes through the inside of the heating oven.
Microwave characterized by comprising heating cover transfer means for removing the heating cover from the rice loading tray after passing through the outlet of the heating oven and transferring the heating cover up to the front of the entrance of the heating oven to cover the rice loading tray. Heating device. 3. A cooling means for vacuum cooling by covering a rice loading tray from which a heating cover has been removed with a vacuum cover at a position past the outlet of the heating oven, and after vacuum cooling, the rice loading tray from which the vacuum cover has been removed is taken out from the conveyor. The microwave heating device according to claim 2, further comprising: a tray reversing transfer device that reverses and reverts to the conveyor again.