JPH1066884A - Production of nonwashing rice - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the production of nonwashing rice simply by a dry method by a method in which at least one kind of starch or grain powder is gelatizized and extruded from the die of a high pressure granulator, an abradant obtained by crushing and grading the obtained material is mixed with polished rice, and the mixture is agitated to polish the polished rice. SOLUTION: An abradant is obtained by a method in which at least one kind of starch or grain powder is gelatinized and extruded from the die of a high pressure granulator, and the obtained material is crushed and graded. Rice powder, grain powder of barley etc., or bran of these are named as the grain powder to be used. Nonwashing rice is produced by using the obtained abradant. The abradant is mixed with polished rice, and the mixture is agitated for polishing to peel off and remove the bran left on the surface of the polished rice. After that, the polished rice is separated from the abradant. After the end of polishing, since the fine bran which is peeled off and separated from rice is contained in the separated abradant, it is preferable to reuse fine bran components after being separated and removed by a fine sieve.

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 unwashed rice which does not require washing when cooking rice.

[0002]

2. Description of the Related Art In rice grains milled by a rice mill, bran produced in the milling process is still attached to fine grooves on the rice grain surface.
If rice is cooked as it is, rice with a scent of rice bran can be cooked, and rice grains have been washed with water.

[0003] However, nutrient components contained in the polished rice are lost due to the washing, and when these effluents are discharged into rivers and the like, they cause pollution of river water. Facilities are required to have a sewage treatment facility.

For this reason, there has been proposed a method of producing wet non-washed rice in which water is added to milled polished rice, mixed and stirred, and then dried, and a method of washing the polished rice with alcohol.

[0005] There has been proposed a method for producing dry-type non-washed rice in which polished rice is polished on the surface of the rice with brush or felt to remove bran.

[0006]

However, in the above-mentioned method for producing wet-type non-washed rice, there is a problem that rice grains are cracked in a dehydration and drying step following water washing or alcohol washing and the quality is easily deteriorated. is there.

[0007] In addition, in the above-mentioned method for producing dry type non-washed rice, there is a problem that the bran adhering to the fine grooves of the rice grain cannot be completely removed, and the bran odor cannot be removed.

[0008] In order to remove the bran adhering to the fine grooves of rice grains, milled rice is housed in a rotating drum having a large number of air holes, and low-temperature, high-humidity air is further blown into the rotating drum. Has been proposed to remove bran from polished rice.
-17383).

[0009] Furthermore, the milled rice is mixed with fine bran and friction-polished to improve the smoothness of the surface of the milled rice.
Next, a method has been proposed in which friction rice is rubbed by sending wet air and the generated bran is immediately discharged (Japanese Patent Laid-Open No. 62-11553).
.

[0010] However, in these methods, in the step of dehydrating and drying the wet polished rice, in addition to the disadvantage that the rice grains are cracked and the quality is deteriorated, the apparatus becomes large and the fine bran is mixed beforehand. The method of performing friction-polished rice has the disadvantage that fine bran must be separated from the polished rice.

Accordingly, an object of the present invention is to propose a method for easily producing non-washed rice by mixing and stirring with dry rice in a dry manner.

[0012]

In order to solve the above problems, according to the present invention, a material obtained by extruding one or more kinds of starch and flour from a die of a high-pressure granulator and extruding the same, Abrasives obtained by grinding and sizing are mixed with milled polished rice and stirred to polish polished rice, and after removing and removing the bran remaining on the polished rice surface, the polished rice is separated from the abrasive. The present invention proposes a method for producing unwashed rice.

First, the abrasive used in the present invention will be described. The abrasive is obtained by pulverizing a material obtained by extruding one or more kinds of starch and flour from a die of a high-pressure granulator and extruding it. And sized.

As the high-pressure granulator, a single-shaft or twin-shaft extruder can be used in addition to a normal pelletizer.

As a raw material of the abrasive, various starches such as rice starch are preferable, but a flour containing starch can also be used.

Examples of the flour to be used include rice flour, barley, wheat, corn and other flours other than rice flour, and brans thereof.

As a raw material of an abrasive used in the production of unwashed rice for sake brewing in which the mixing of substances other than rice is regulated, rice starch, rice flour, white bran and the like are used.

If necessary, a small amount of water is added to starch, flour or a mixture thereof and fed to a high-pressure granulator, and the starch or starch constituting the flour is pregelatinized in the machine to form a high-pressure granule. Extruded from the machine die.

By processing in a high-pressure granulator, the starch or starch constituting the flour is pregelatinized to make the physical properties of the processed material after pressure shaping dense, and the temperature, pressure and shear of the high-pressure granulator. The enzymes contained in these starches or flours are deactivated by force or the like.

The barrel temperature of the high-pressure granulator must be controlled in accordance with the starch or the starch contained in the flour, since the gelatinization temperature of the starch varies depending on the type of the starch.

The raw material obtained by continuously pregelatinizing and extruding from a die of a high-pressure granulator, cutting, shaping and drying is crushed and sized to obtain an abrasive. The size of rice must be larger or smaller than the size of rice particles in order to easily sieve and separate dry-washed rice and abrasive, but it remains in fine grooves on the surface of rice To remove the bran efficiently, the particle size of the abrasive should be
1.0 mm or less is desirable.

Next, the manufacture of non-washed rice using the abrasive obtained as described above will be described. The manufacture of non-washed rice is carried out by mixing an abrasive with polished white rice, stirring and polishing. The bran remaining on the surface of the polished rice is removed and removed, and then the polished rice is separated from the abrasive.

Here, when mixing and stirring the abrasive and the polished rice, the abrasive is sufficiently polished to the rice grains as in the case of washing with water, and a small amount of bran remaining on the surface of the rice grains is completely removed by a dry method. After that, the rice and the abrasive are separated by sieving to produce unwashed rice.

If the mixing ratio of the polishing agent and the polished rice is about polished rice 1: abrasive 0.1 to 1.0, even if the mixture is vigorously mixed and stirred, there is little chance of the rice particles rubbing each other. If the contact efficiency is high and the polishing efficiency is high, but the mixing ratio between the abrasive and the polished rice is lower than this (for example, several percent), the polished rice rubs against each other during vigorous mixing and polishing, and the risk of producing bran again There is.

In order to mix the abrasive and the polished rice, a vertical or horizontal mixer equipped with a stirrer may be used as long as the abrasive and the polished rice can be efficiently polished and contacted. May be continuous.

After the polishing is completed, the separated abrasive can be used repeatedly for polishing. In this case, the separated abrasive contains a small amount of fine bran separated and separated from rice. For example, it is preferable that the fine bran component is separated and removed by a 100-mesh sieve and then reused.

By mixing and polishing the abrasive and the polished rice, the bran remaining in the fine grooves on the rice surface can be removed and the rice surface can be smoothed to increase the whiteness of the polished rice. The results of measuring the whiteness before and after the treatment with a Nippon Denki Colorimeter were, for example, 41.4 without treatment and 43.9 after treatment. Was.

In order to prevent the raw material of the abrasive from affecting the flavor of the cooked rice, if the raw material is made of pure starch or high-quality edible flour, the fineness of the polished rice surface is reduced. There is no need to completely remove the powder.

Further, by mixing and polishing the abrasive and the polished rice, the substance exhibiting the enzymatic action remaining in the fine grooves on the surface of the rice is completely removed, so that the preservability of the unwashed rice can be improved. .

Since the enzymatic action in the abrasive has been deactivated as described above, even if fine abrasive powder adheres to the unwashed rice and remains, the oil present in the rice is oxidized. It does not degrade rice quality.

[0031]

Embodiments of the present invention will be described below. (1) Production of polishing agent: 10 to 30 parts of water is added to 100 parts of starch, and the mixture is kneaded and uniformly watered. This humidified mixture was fed into an extruder, and when transferred in a barrel tube in a cylinder by a rotating screw, the raw starch, which was mainly self-generated by frictional heat, was gelatinized and attached to the tip. The material is extruded from a die having a large number of ejection holes, and cut by a cutter to obtain a material.

In this case, the extruder adjusts the opening area of the die according to the type of starch, and if necessary, cools it with cooling water or heats it with a heater to adjust the processing temperature of the barrel.

The extruded and shaped material is put into a drier and dried to a water content of 12 to 15%.
The mixture was sieved with a 16-mesh sieve, and the portion passing through the sieve was used as an abrasive.

(2) Production of non-washed rice To 100 parts of milled polished rice, 10 to 100 parts of the abrasive obtained as described above are mixed, and the mixture is mixed with a circulating mixer equipped with a screw rotating section for 10 to 15 parts. Polishing was performed for 10 to 15 minutes, or by a continuous mixer having a high mixing and polishing ability.

After finishing the polishing, the mixture in the mixer was sieved with a 16-mesh sieve, and the abrasive was passed through the sieve and separated to obtain washed rice.

By mixing and polishing the polishing agent and the polished rice as described above, it is possible to remove the bran remaining in the fine grooves on the rice surface and to smooth the rice surface to increase the whiteness of the polished rice. Although it is possible, in this example, the whiteness before and after processing was measured with a Nippon Denshi Colorimeter,
It was 43.9 after the treatment, and it was recognized that the one after the treatment was clearly white even by the naked eye.

The polished rice from which the abrasive has been separated and removed generates heat due to polishing, and its water content falls below the appropriate water content for rice. In such a case, fine mist of water is sprayed on the rice to disperse the water content. To adjust. By adding vitamin C to the water to be sprayed here, there is an effect of improving the preservability of non-washed rice.

[0038]

In summary, according to the present invention, the bran remaining in the fine grooves on the surface of the polished rice can be completely removed, and the surface of the polished rice can be smoothed. Can improve the commercial value of non-washed rice.

Further, according to the present invention, the enzyme adhering to the surface of the polished rice is completely removed, so that the preservability of the unwashed rice can be improved.

Further, according to the present invention, since the bran and the like remaining in the fine grooves on the surface of the polished rice are completely removed, it is possible to omit the water washing and rice washing steps during the cooking of rice. Can be prevented, and the pollution of the river by the washing water can be prevented, and the scale of sewage treatment facilities required in a large-scale rice cooker can be significantly reduced.

Claims (2)

[Claims] A raw material obtained by extruding one or more kinds of starch and flour from a die of a high-pressure granulator and extruding the resulting material is crushed and sized to obtain an abrasive. A method for producing unwashed rice, comprising mixing and stirring the polished rice to grind the polished rice, removing and removing the bran remaining on the polished rice surface, and then separating the polished rice and the abrasive. 2. The method for producing unwashed rice according to claim 1, wherein water containing vitamin C is added to the polished rice obtained by separating the abrasive.