JPS6345779B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved method of processing polished rice to improve the quality of polished rice.

Conventional parboiled rice is basically made by soaking and absorbing water, steaming the paddy to gelatinize it, and then drying it in batches.After that, the unhulled brown rice is polished. Brown rice and white rice are sometimes steamed using high-temperature steam after soaking, but this is not done because cracks occur due to water absorption and expansion during soaking.

If brown rice is soaked while still in the shell, even if cracks occur, they will be gelatinized by steaming over 100 degrees Celsius.
It has become common practice to glue broken rice into raw rice and dry it to process it into whole-grain brown or white rice.

In this case, the entire rice grain is steamed, which not only requires a large amount of steam and heat, but also requires a large amount of hot air to dry the brown rice, which consumes thermal energy. The fateful defect is that the starch layer in the center is transparently dyed, resulting in candy-colored white rice. In addition, even if it is a good example, the viscosity of the rice grains is insufficient, resulting in loose and brittle cooked rice that loses the unrivaled quality of ordinary white rice and cannot avoid being inferior in flavor to one's taste.

In addition, conventionally used methods for gelatinizing polished rice include the following methods.

1 Heat white rice with enough water to gelatinize the starch.

2. Soak white rice thoroughly in water to absorb water, then steam to gelatinize the starch.

3. Treat the starch gelatinized in steps 1 and 2 above using one of the following methods.

A: Hot air drying method, B: Freeze drying method, C: Method of immersing in methanol or ethanol, dehydrating, and then drying.

Any of the above methods can be adopted as a gelatinization method for polished rice, but in method 1 above,
The gelatinized rice contains about 60% water, and the above
Even steamed rice obtained by method 3 has a moisture content of 35 to 40%, so drying using any method A to C shown in 3 above requires a large amount of expense, and rice or steamed rice becomes sticky. Because of this, there have been various problems such as unstable flow of pregelatinized rice during the transportation process or drying process, and uneven drying due to adhesion to equipment.

As a means to solve the above problems,
The technique disclosed in Publication No. 4636 is a method in which polished rice is gelatinized using high-pressure saturated steam without soaking it in water. However, with this method, the gelatinized white rice turns brown and is unsuitable as a raw material for sake, so the following gelatinization treatment method was proposed. That is, after soaking the raw polished rice in water for 10 to 30 seconds, immediately drain it thoroughly, leave it to stand and wait for the water adhering to the surface to be absorbed by the rice grains, and then soak it at a gauge pressure of 1 kg/kg.
This is a method for producing pregelatinized rice, which is used as a raw material for brewing, by steaming it with ² cm2 of steam for about 20 minutes and then drying it through ventilation. However, in the above method, each process is processed individually, and it is not processed as an integrated process, and the rice grains are soaked in water, drained, and left to stand for the adhering water to be absorbed into the rice grains. There was a need to rationalize the manufacturing cost since pretreatment was required and long time was required for gelatinization and drying.

Since the present invention solidifies only the starch layer of the thin powder layer on the surface of the polished rice grain, there is no need for complicated soaking or drying of the polished rice, and the starch exposed on the surface of the polished rice grain is removed through extremely short steam contact. Immediately after solidification, it is air-dried, and gelatinization smoothes the polished rice grain surface and hardens it, so it does not elute even when soaked, so there is no staining and the need for washing the rice can be omitted. Furthermore, when rice is heated and cooked in a state where the water absorption resistance increases and the initial speed of water absorption is significantly suppressed, the structure of the cell membrane in the inner layer of the rice grain loosens, water absorption progresses relatively rapidly, and the rice can be completely cooked into complete rice grains without cracks. It goes without saying that crack-free rice is the key to flavor. In addition, the high-temperature steam sterilizes and kills insects on the surface of the polished rice grains, and by gelatinizing and smoothing the surface, there is no room for moisture or sterilization particles, so there is no risk of mold growth or deterioration, and storage is possible. safety can be established.

The present invention has the same effect on white rice for sake brewing as well as white rice for rice, but the difference from rice for rice is that the unrinsed rice prevents the generation of fatty acids and the initial rate of water absorption during soaking. If underwater cracking is prevented by suppressing the above, ideal evaporation becomes possible and the alcoholization rate of koji is improved, so the overall effect is extremely significant.

An example (part 1) of an apparatus for carrying out the present invention will be described. Inside the porous wall polishing cylinder 1, a polishing trochanter 2 is mounted on a main pipe shaft 3 for ventilation and moisture supply to form a polishing chamber 4, and the polishing chamber 4 is provided with a rice feeding port 5 and a rice discharging port 6, respectively. The ventilation slot 7 of the whitening trochanter 2 is connected to a large number of ventilation holes 8 provided in the main pipe shaft 3, and the ventilation hole 9 of the main pipe shaft 3 is provided with an ultrasonic nozzle 10.
has been temporarily set up. Further, the outer circumference of the porous-walled polishing cylinder 1 is surrounded by a suction wall 11, and an exhaust fan 12 is connected to the end of the suction wall 11.
It is connected to a water tank 16 of a humidifier 15 through a water pipe 14 equipped with a flow rate control valve 13, and to an air compressor 18 through a blower pipe 17, thereby integrally forming a water-addition friction type rice polishing machine device 19. It has been done. next,
A heating steam generator 2 is installed in the downstream stage of the rice polishing device 19.
A polished rice grain surface processing device 21 is provided, and the processing device 21 has a perforated wall glazing drum 23 in a machine frame 22, and the drum 23 is rotatably supported by a horizontal or oblique shaft 24. At the same time, the air supply port 26 provided in the cavity 25 is connected to the steam generator 20, and the supply port 27 provided on one side of the machine frame 22 is connected to the rice discharge port 6 of the rice polishing device 19. A discharge port 28 is provided on the other side of the machine frame 22.

The brown rice or white rice that flows into the rice milling chamber 4 from the rice supply port 5 is milled by moist air supplied from the humidifier 15, and an appropriate amount of moisture is added to the white rice so that only the surface of the white rice grains is moistened and soft in an extremely thin layer. At the moment of hardening, only a thin layer of the surface of the polished rice is peeled off by the polishing trochanter and the porous wall polishing tube, and the rice bran and moisture generated each time are discharged through the porous walls to the outside of the milling chamber by ventilation, exposing the hard surface of the polished rice grains. Due to mutual polishing action, each polished rice grain surface is finished into a beautiful ultra-shiny surface. The polished rice with the super glossy surface continuously flows into the polished rice grain surface processing device 21 in the subsequent process, and the crazing drum 2 with its porous wall
It is discharged while flowing inside 3 like an avalanche. During the flow process, within 30 seconds, only the thin starch layer on the surface of each polished rice grain is completely uniformly coated with high-temperature steam of 100°C or higher or heated steam supplied from the heating steam generator 20. Immediately after that, it is discharged outside the machine from the discharge port 28 and air-dried, and the surface of each polished rice grain is gelatinized and smoothed, so that the processed polished rice having the above-mentioned unique effects is continuously and smoothly produced. It will be mass-produced.

The apparatus of the embodiment (part 2) in FIG. 2 exemplifies the case where a polished rice grain surface processing device 29 equipped with a heating steam generator 20 consisting of a boiler and a blower is provided in the downstream process of the water-addition friction rice milling device 19. and the processing device 2
Reference numeral 9 has a grain board 32 installed in a machine frame 30 in an inclined manner, which is provided with a large number of inclined blow holes 31 that blow air in an upward direction.
In addition, a supply port 33 is provided in the machine frame 30 at the upper part of one side of the grain board 32, which communicates with the rice discharge port 6 of the rice milling device 19, and a discharge port 34 is provided in the other side of the machine frame 22. An air supply port 36 of a blower tube 35 provided at the lower part of the grain board 32 is connected to the heating steam generator 20. Therefore, each milled rice supplied from the water-friction rice polishing device 19 to the flowing grain plate 32 of the polished rice grain surface processing device 29 is jetted from the inclined jet port 31 on the surface of the plate 32.
Only the thin starch layer on the surface of the polished rice grains is uniformly gelatinized by the high-temperature steam of 100°C or higher, and immediately after the flow process (within 30 seconds), the polished rice is discharged from the outlet 34 to the outside of the machine. Processed white rice with gelatinized and activated grain surfaces is produced by air drying. Since the present polished rice grain surface processing device 29 uses a fixed jet type flow grain plate, its structure is simplified and there are fewer failures.
It also reduces the cost of production.

As described above, according to the present invention, the method of processing white rice involves gelatinizing the surface of white rice grains with high-temperature steam or heated steam of 100°C or higher within a short time of 30 seconds, and then naturally drying the rice. This method has the remarkable effect of processing the gelatinization process of polished rice in an extremely short time and greatly rationalizing the manufacturing cost and efficiency.

[Brief explanation of drawings]

The drawings are illustrations of embodiments of the present invention. FIG. 1 is a partially cutaway side view of the embodiment (part 1), and FIG. 2 is a partially cutaway side view of the embodiment (part 2). 1... Porous wall polishing tube, 2... Polishing trochanter, 3... Main pipe shaft for ventilation and moisture supply, 4... Milling room, 5... Rice feeding port, 6... Rice discharge port, 7... Ventilation groove hole, 8... Ventilation hole, 9...Air supply hole, 1
0... Ultrasonic nozzle, 11... Air suction wall, 12... Air exhaust machine, 13... Flow control valve, 14... Water pipe, 15... Humidifier, 16... Water tank, 17... Blower pipe, 18... Air compressor, 19... Hydrostatic friction rice polishing device, 20... Heating steam generator, 21... Polished rice grain surface processing device, 22
... Machine frame, 23 ... Glazing drum, 24 ... Oblique shaft, 25 ... Cavity part, 26 ... Air supply port, 27 ... Supply port, 28 ... Discharge port, 29 ... Polished rice grain surface processing device, 3
0... Machine frame, 31... Inclined blowhole, 32... Grain plate, 3
3... Supply port, 34... Discharge port, 35... Blower tube, 36
...Air supply port.

Claims (1)

[Claims] 1. A method for processing polished rice, which comprises applying high-temperature steam or heated steam at 100° C. or higher to gelatinize the surface of polished rice grains for a short period of time within 30 seconds, and then naturally drying the grains. 2. The polished rice processing method according to claim 1, wherein the polished rice is processed into ultra-shiny polished rice using a water-friction rice milling device and then gelatinized using steam. 3. The method for processing polished rice according to claim 1 or 2, wherein the polished rice is subjected to a process of gelatinizing the surface of the polished rice grains in a continuous process.