JPS59227257A - Method and apparatus for processing polished rice - Google Patents

Abstract

PURPOSE:To prepare rice free of broken rice grain, having improved preservability, and suitable for brewing Japanese SAKE, by cleaning rice to a yield lower than a specific level, controlling the water-content of the polished rice, drying and hardening the surface layer of the rice grain with hot air, irradiating the grain with electromagnetic wave to effect the rapid heating and evaporation of water in the core part of the grain, and carrying out the secondary drying of the rice with cold air stream. CONSTITUTION:Polished rice polished in the rice-cleaning chamber of the rice- cleaning apparatus 2 to a yield of <=80% is introduced into the conditioning apparatus 5, and the rice falling down in the conditioning chamber 6 is moistened with humid air generated 9, introduced 7 into the conditioner and exhausted 8 therefrom. The rice conditioned to a water-content of about 15-16% at the core part is sent to the primary drier 11 to effect the drying and hardening of the surface layer of the grain with hot air generated 12 and introduced into the drying chamber, and then the treated rice is transferred to the apparatus 14 for the electromagnetic wave irradiation, in which the rice is irradiated with electromagnetic wave in the range from short wave to microwave to heat and evaporate the water in the core part of the grain. The treated rice is introduced into the secondary drier 18, and dried to a desired water content with supplied (19) low- temperature air of normal temperature - about 60 deg.C, and the product is discharged from the apparatus and sent to the next step.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polished rice processing method and apparatus for processing ordinary rice into rice suitable for sake brewing.

Traditionally, Yamada cotton and Omachi are the most suitable rice for sake brewing.

Although there are specific varieties such as Hetan and Gohyakumangoku, there is no one that has processed ordinary white rice into suitable rice.

In view of the above points, the present invention has been developed by tempering polished rice that has been milled to a milling yield of 80% or less to a moisture content of approximately 15% to 16%, and then primary drying with hot air to dry and harden the surface layer of the rice grains. , After irradiating the polished rice with electromagnetic waves ranging from short waves to microwaves to rapidly heat and swell some of the water in the rice grains and evaporate them,
By secondary drying with low wind and tempering to an arbitrary predetermined moisture content, the starch density of the inner layer of the rice grain of the polished rice, which has been dried and hardened at the surface layer of the rice grain, is coarsened like that of the white core of sake rice. It also improves storage properties by tempering the polished rice to a predetermined moisture content, and facilitates the Ff action to prevent body-side formation. The purpose is to develop and provide a rational method and apparatus for processing rice suitable for sake brewing.

The present invention will be explained with reference to embodiment figures. Reference numeral 1 in the figure is a raw material loading elevator, and the discharge port of the elevator 1 is connected to a supply tank 3 of a grinding type rice milling device 2 located nearby. The outer skin of raw brown rice is appropriately cut by the grinding action of the diamond sand roll, and the discharge port of the rice milling device 2 is connected via an elevator 4 to a tempering device 5 installed nearby. l]'jI system [5 has an air supply passage 7 of a chevron-shaped ventilation tube inside the heat treatment mold 6.
and exhaust passages 8 are provided in multiple rows and stages, and each of the above-mentioned leakage passages 7 and
... is communicated to the humidity I11 generator 9, and the milled and milled rice flowing down the tempering mold 6 is humidified to form a predetermined moisture content #A, and tempered again! The outlet of the I device 5 is connected to the primary drying equipment kll installed nearby via the downflow gutter 10 of the circulation elevator, and the drying equipment! 1111 is hot air generating furnace 1
2, the polished rice flowing in the direction of rotation of the drying device 1 is dried by hot air to dry and harden the surface layer of the rice grains. 13 to an electromagnetic wave irradiation device 14 provided nearby, and the irradiation device 14 irradiates electromagnetic waves from short waves to microwaves to the polished rice conveyed by a conveyor 16 placed horizontally within the irradiation ¥15. The rice grains are formed so that they are rapidly heated, expanded and evaporated as the moisture content of the inner layer of the rice grain increases, and the discharge port of the electromagnetic wave irradiation device 14 is connected to a secondary drying device @ 18 provided nearby via an elevator 17. The drying device 18 is connected to a hot air generating furnace 19, and the rice grains flowing down the drying chamber are tempered by low-temperature air into polished rice having a predetermined moisture content and then discharged. 20 is a depressurizing compressor connected to the electromagnetic wave irradiation device.

With the above-mentioned configuration, the brown rice put into the elevator 1 for loading raw materials flows down from the elevator 1 to the grinding rice milling device 2, and after polishing in the rice milling device 2, the pressure between the grains is reduced to 500.
o/d or less and the brown rice is polished by the grinding action of a diamond sand roll rotating at a circumferential speed of 600 m/1 ain or more. iiM, the polished rice polished to a rice milling yield of 80% or less is carried into the tempering device 5. In the tempering device 5, the moist air generated by the humid air generating device 9 flows in from the air supply path 7 and flows out to the air exhaust path 8, while humidifying the polished rice flowing down in the air 111jlf to 6. Then, the polished rice, which has been tempered to a moisture content of about 15% to 16% with the moisture inside the rice grains in equilibrium, is carried into the primary drying unit &11. In the drying device 11, hot air generated in a hot air generating furnace 12 flows into a drying chamber to dry and harden the surface layer of the rice grains of the polished rice. Then, the polished rice whose surface layer of the rice grain has been dried and hardened is carried into the electromagnetic wave irradiation device 14. In the electromagnetic wave irradiation device 14, the conveyor 1
The white rice transported on rice grains 6 is irradiated with electromagnetic waves ranging from short waves to microwaves, which heats and swells the moisture in the inner layer of the rice grain and evaporates it, which changes the starch density of the inner layer and the whiteness of the sake rice. Similarly, it becomes coarse and forms a porous portion 7j. The polished rice irradiated with a predetermined electromagnetic wave by the irradiation device 14 is transferred to the secondary drying device 1.
It will be brought in on 8th. In the secondary drying device 18, the normal humidity flowing from the hot air generating furnace 19 is heated to a low temperature of about 6°C.
+, :/Thus, the polished rice is dried and tempered to an arbitrary predetermined moisture content, and the polished rice is taken out of the machine and sent to the next process.

Claim (2) is a method of irradiating electromagnetic waves ranging from short waves to microwaves to rapidly expand and evaporate moisture in the inner layer of rice grains, and then steaming the polished rice under pressure to turn it into alpha. After that, secondary drying is carried out using low-temperature air and the moisture content is tempered to an arbitrary predetermined moisture content. It has the advantage that it can be tempered to a predetermined moisture content and processed into steamed rice suitable for sake brewing, which has a long shelf life.

The pressurized rice steaming device 21 according to claim @ (4) is as follows:
It is connected to the boiler device 22 and is formed so that the polished rice conveyed by the net conveyor in the cN rice tank 23 is steamed by superheated steam in a pressurized state.
Depending on the previous process, the rice milling yield is less than 80% and the moisture content is 15% to 1.
Polished rice is tempered to about 6%, the surface layer of the rice grain is dried and hardened, and the moisture in the inner layer of the rice grain is heated and expanded to evaporate. +ko/cn'&! 10 degrees under pressure
Steamed rice suitable for sake brewing can be processed by steaming with superheated steam of 0° C. or higher, and the steamed rice can be heated to a predetermined moisture content by passing through the secondary drying device 18 in the subsequent step to make the steamed rice storable. It can be processed into high quality steamed rice.

As described above, the method and apparatus for processing polished rice of the present invention tempers polished rice to a moisture content of approximately 15% to 16% to a rice milling yield of 80% or less, and then performs primary drying with hot air to dry and harden the surface layer of the rice grains. Next, the polished rice is irradiated with electromagnetic waves ranging from short waves to microwaves to heat the moisture in the inner layer of the rice grain, convert it into evaporation, and then dry it secondarily using low-temperature rice to adjust the moisture content to the specified moisture content. By clarification, the surface layer of the rice grain becomes dry◆.
The starch density of the inner layer of the rice grain of the polished rice is made into a coarse porous part similar to the core white part of sake rice, and the inner layer of the rice grain of the polished rice has poor water absorption. Improved rice grains can be processed into rice suitable for sake brewing, which activates the propagation of koji mold throughout the whole grain and facilitates water resistance, and the suitable rice has storage stability and does not produce split grains, so it can be processed into rice suitable for sake brewing. This method not only makes it possible to uniformize the quality of the product by processing it into suitable rice under certain conditions, but also ensures the mass production of high-quality suitable rice.

[Brief explanation of the drawing]

The drawing is a side view of an embodiment of the invention. 1... Lifting machine for loading raw materials 2... Grinding rice polisher-3
...Supply tank 4...Elevator 5...Refining device 6...Refining to 7...Air supply path
8...Exhaust duct 9...Damp air generator 10...
- Downflow gutter 11...-Next drying device 12...Hot air generating furnace 13...Elevator 14...Electromagnetic wave irradiation length d15...Irradiation end 16...Transfer conveyor 17...Elevator 18. ...Secondary drying device 19...Heat J = + Furnace 20...Compressor for pressure reduction 21...Rice steaming device for pressurization 22...Boiler d
23...Steamed rice tank patent applicant

Claims (4)

[Claims] (1) After polishing the polished rice to a rice milling yield of 80% or less and tempering it to a moisture content of about 15% to 16%, the surface layer of the rice grain is dried and hardened by primary drying with hot air. This white rice is characterized by being irradiated with electromagnetic waves ranging from short waves to microwaves to rapidly heat, expand, and evaporate the moisture in the inner layer of the rice grain, and then subjected to secondary drying with low sea breeze to temper it to a desired moisture content. Processing method. (2) The polished rice is irradiated with electromagnetic waves ranging from short waves to microwaves to rapidly expand and evaporate the moisture in the inner layer of the rice grain. The rice is then steamed under pressure to become alpha, followed by secondary drying using low-temperature air. A method for processing polished rice according to claim (1), wherein the polished rice is tempered to an arbitrary predetermined moisture content. (3) A primary drying device using hot air is installed in the post-process of the tempering device, which is equipped with a rice polishing device in the previous process, and a secondary drying device using low-temperature air is installed in the post-process of the drying device via an electromagnetic wave irradiation device. Polished rice processing Ml is defined as 5fIm that a one-person processing process is formed. (4) The polished rice processing apparatus according to claim No. (3) T#, characterized in that a secondary drying device using low-temperature air is provided in a downstream stage of the electromagnetic wave irradiation device via a pressurizing rice steaming device.