JPS61178041A - Polished rice processing method and apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rice polishing method and apparatus for increasing the main components of taste and high-quality aroma in the inner layer of rice grains, and producing polished rice with a glossy surface. .

Conventional technology and its problems The ratio of bran layer, germ, embryo, milk, etc. of brown rice is approximately 6:3:
91 2), the operation of removing the bran layer and endosperm is called pulverization, and the nutritional content differs depending on the degree of pulverization.
), this is because the ingredients contained in each part of the rice grain are different, including protein.

Lipids, ash, vitamins, etc. are present in large quantities in the bran layer, germ, etc.
By milling the rice grains, there is a large loss of these components2.
), protein is about 85% of brown rice in white rice, and fat,
Since the fiber and ash content are reduced to about 35% to 45% of brown rice, the main components of taste such as nucleic acids, amino acids, and sugars and vitamins.

There was a problem in that the aroma etc. were significantly lost, and the loss of these components due to milling led to a decline in the quality of the rice grains.

Purpose of the Invention In view of the above points, the present invention provides a method of adhering high-quality rice bran powder to polished rice by mixing and stirring, and then humidifying and pressurizing the rice bran powder to penetrate into the inner layer of the rice grain. 2) By friction-polishing the rice into milled rice with a predetermined level of polishing, the disadvantages of the conventional equipment and methods described above can be eliminated, and water-soluble nutrients and aromas in the rice bran can be removed in a short time by pressure action. The purpose of the present invention is to provide a rice milling method and apparatus that efficiently penetrates into the inner layer of rice grains to improve the quality of finished polished rice, and that also reliably mass-produces high-quality polished rice with a glossy surface without cracks in the rice grains. .

Method and Structure of the Invention The rice polishing method of the first invention includes mixing and stirring and adhering bran powder to polished rice whose surface layer of the rice grain has been properly milled, followed by humidification and pressurization to remove the components of the rice bran from the rice grains. After permeating into the inner layer, the rice is polished by friction polishing to obtain polished rice of any desired degree of polishing.

The rice milling device of the second invention is provided with a rice grain pressurizing device in the post-process of the rice grain humidifying device which is provided with a mixing and stirring device for polished rice using rice bran in the pre-process, and a friction rice polishing device in the post-process of the pressurizing device. It has a configuration characterized in that it provides an integrated rice polishing process.

DESCRIPTION OF EMBODIMENTS A preferred embodiment of the present invention will be described with reference to FIGS. 1 and 2.

Fig. 1 shows a rice grain humidifying device 2 which is provided with a mixing and stirring device 1 for polished rice using rice bran in the previous step, a rice grain pressurizing device 3 is provided in the post-process of the pressurizing device 3, and a wet friction rice polishing device in the post-process of the pressurizing device 3. This is a rice milling processing device that is equipped with 4 to form an integrated rice milling process.

The mixing and stirring device 1 for polished rice includes a rotating roller 6 on a base 5.
A stirring cylinder 8 equipped with stirring blades is mounted on the rotation apparatus 7 to rotate, and a tank 9 for polished rice and a tank 9 for rice bran are mounted on one side of the stirring cylinder 8. A tank 10 is provided, and the discharge part of each tank 9, 10 and the supply part 11 of the stirring cylinder 8 are connected to a flow pipe 12 or 13.
The discharge part 14 of the stirring cylinder 8 and the supply part of the humidifying grain frying machine 15 are connected by a discharge pipe 16.
1 is a grain frying machine for polished rice, and 18 is a grain frying machine for bran flour.

The rice grain humidifying device 2 is provided with a grain supply port 2o in the upper part of the machine frame 19 and a grain discharge port 21 in the lower part thereof, and a grain flow path inside the machine frame 19 is provided with a ventilation chamber 22. An air exhaust passage 23 communicating with the air supply chamber 24 and a picture air passage 25 communicating with the air supply chamber 24 are arranged vertically in multiple stages and rows. Wind generator 2
7, the grain supply port 20 at the top of the machine frame 19 and the discharge part of the grain frying machine 15 are connected through a flow pipe 28, and the grain discharge port 21 at the bottom of the machine frame 19 is connected to the grain discharge port 21 at the bottom. The supply section of the rice grain pressurizing device 3 is connected through a flow tube 29.

The rice grain pressurizing device 3 is provided with a conditioning pressurizing tank 30 for pressurizing and controlling the humidity of polished rice, and the grain supply port 31 of the pressurizing tank 30 and the grain discharge port 21 of the machine frame 19 are connected to the They are connected by a flow pipe 29, and an automatic air shutoff valve 32 is provided in the middle of the flow pipe 29, and a grain outlet 33 at the bottom of the pressurized tank 30 and the fried grains I! 142 are connected through a flow pipe 35 equipped with an automatic air shutoff valve 34, and a branch valve 36 provided in the flow pipe 35 and the supply part of the humidifying grain frying machine 15 are connected through a branch flow path 37. In addition, an air compressor 38 is provided on one side of the pressurized tank 30, and an air supply hole 3 provided on the upper side of the pressurized tank 30.
9 and the compression device 38 are connected by an air supply pipe 41 equipped with a pressure regulating valve 40 and the like.

The wet rice milling device 3 has a friction milling trochanter 44 inserted into a ventilation main pipe shaft 45 inside a porous wall milling cylinder 43 to open a milling chamber 4.
6 is formed, and a supply tank 47 is connected to a grain feeding section provided on one side of the milling room 46, and the supply tank 47 and the discharge section of the grain lifting machine 42 are connected by a flow pipe 48. An injection nozzle 45A is installed at the end of the main ventilation pipe shaft 45, and the injection nozzle 45A is connected to the water tank 48 via a water pipe 49A and to the air compressor 50 via a blower pipe 49. A humidifying device 51 is integrally formed, and 52
Reference numeral 53 indicates an exhaust fan, and 53 indicates a rice grain discharge port.

The operation of the above-mentioned configuration will be explained below.

When the apparatus is started by supplying high-quality bran flour containing protein, fat, ash, vitamins, aroma, etc. to the bran flour tank 10, and supplying polished rice whose surface layer of rice grains has been appropriately milled to the polished rice tank 9. The polished rice and bran powder flow out from each of the tanks 9 and 10 at a predetermined ratio and flow into the stirring cylinder 8 of the mixing and stirring device 1 for polished rice. Inside the stirring cylinder 8, the white rice and rice bran are mixed and stirred by the rotation of stirring blades provided on the inner surface of the cylinder 8, and flow toward the discharge side of the cylinder 8, and the white rice with the rice bran attached to the grain surface is It is discharged from the cylindrical discharge part 14 and flows into the supply part of the humidifying grain lifting machine 15 via the discharge pipe 16, and the grain lifting machine 1
The rice grains are fried by 5 and supplied to the rice grain humidifier 2. In the machine frame 19 of the humidifying device 2, while the hot and humid air generated by the humid air generating device 27 flows from the air chamber 24 to the air exhaust passage 23 via the air passage 25, the above-mentioned particles with bran powder attached thereto are removed. The white rice flows down, and the rice grain surface is humidified as it flows down to the grain outlet 21 at the bottom, and the white rice with the adhering bran powder humidified flows through the flow pipe 29 from the grain outlet 21 and opens and closes automatically. The rice grains are supplied through a valve 32 into a refining pressurizing tank 30 of the rice grain pressurizing device 2 provided at the bottom.

The pressurized refining tank 30 is filled with compressed air generated by the air compressor 38 from the air supply hole 39 provided on the upper side of the tank 30 through the air supply pipe 41, so that the adhering bran is not absorbed. The tempering action of the moistened white rice is carried out under pressure. That is, the water added to the surface of the rice grain by the humidifying action of the humidifying device 2 moistens the bran adhering to the grain surface and transfers water-soluble nutrients and water-soluble aroma to the inner layer of the rice grain 2). In addition, the tempering effect in a normal storage tank transfers moisture on the surface of the rice grains to the inner layer of the rice grains at a safe water absorption rate (moisture content of approximately 0.2% by weight per hour), eliminating moisture spots within the rice grains. In order to prevent rice grain cracking, the tempering action requires a long time, but the tempering action of the present invention is carried out under pressure.
The rate at which the water containing the water-soluble nutrients and water-soluble aromas migrates to the inner layer of the rice grain is accelerated to a high rate higher than the safe water absorption rate by the pressurizing action in the pressurized tank 30, and the water content is transferred to the inner layer of the rice grain during an extremely short FR. is transferred within the rice grain to eliminate the moisture difference between the surface layer and the inner layer of the rice grain, and the water-soluble nutrients and aroma of the rice bran are transferred to the inner layer of the rice grain and are reliably adsorbed. The polished rice flowing down inside the tank 30 while performing the above-mentioned tempering action is discharged from the grain outlet 33 of the pressurized tempering tank 30, and is also discharged from the flow pipe 3.
5. The automatic opening/closing valve 349 flows down the branch flow path 37 and flows into the supply section of the humidifying grain frying machine 15, and the fried grains! The rice grains are fried by the rice grain humidifier 115 and returned to the upper rice grain humidifying device 2 again. This rice grain circulation process is repeated several times to adsorb a predetermined amount of moisture, and the polished rice is discharged from the grain outlet 3 of the conditioning pressurized tank 30, and is discharged from the grain outlet 3 of the conditioning pressurized tank 30. It flows down the automatic opening/closing valve 34 and into the supply section of the rice-milling grain frying machine 42, flows down the flow pipe 48 from the discharge section of the fried grain Ia 42, and is supplied to the supply tank 47 of the wet friction rice milling bag @4. .

In the friction rice milling device 4, the surface of the rice grains flowing into the milling chamber 46 is softened by moist air flowing from the humidifier 51 through the ventilation main pipe shaft 45, and the surface of the rice grains is softened by the rotation of the friction milling trochanter 44. The surface of the rice grains is peeled off by the frictional force of The inner layer adsorbs the main flavor components and high-quality aroma, and it is processed into polished rice with a beautiful grain surface without cracks, which is taken out of the machine and sent to the next process.

FIG. 2 shows a humidifying, pressurizing and tempering device A for mixed polished rice (2), in which a stirring device 57 consisting of a screw conveyor 55 and a stirring cylinder 56 is installed upright inside a sealed tank 54, and the tank A humidifying injection nozzle 58 and a pressurizing air supply hole 59 are provided on the upper side of the tank 54 to supply moist air and compressed air into the tank, respectively. The polished rice and bran powder in a predetermined ratio supplied from the pipe 61 into the sealed tank 54 are humidified by the humid air from the humidifying jet nozzle 58, and the stirring cylinder 55 is rotated by the rotation of the screw conveyor 55 of the stirring device 57. 56, the polished rice and bran powder are conveyed while being stirred and mixed from the bottom to the top, so that the bran powder adheres to the grain surface of the polished rice, and the polished rice with the bran powder attached is transported by compressed air jetted from the air supply hole 59 for pressurization. The stirring cylinder 5 moves the inside of the pressurized tank 54.
While flowing downward from above along the outside of the rice grain, the water containing the water-soluble nutrients and water-soluble aromas of the rice bran adhering to the surface of the rice grain is absorbed into the inner layer of the rice grain at a high speed higher than the safe water absorption rate mentioned above. The polished rice is transferred and permeated, and when a predetermined amount of moisture has been adsorbed by circulating within the closed tank 54 several times, a grain threshing pipe equipped with an air cut-off valve 62 provided at the bottom of the tank 54 is used. It will be discharged from the aircraft from 63 and left for the next process. The pressurized tempering device A includes the mixing and stirring device 1.
The rice grain humidifying device 2 and the rice grain pressing device 3 are integrally formed.

In addition, in the above example, the case where milled rice with a standard polishing degree was explained using a wet friction rice milling device, but there is a case where a general friction rice milling device or a rice polishing device is used to mill rice to a standard milled level. 2) Also, as a method of imparting aroma to white rice, rice bran from special brands of rice such as ``Koshihikari'' and ``Sasanishiki'' is mixed and stirred just before the standard polishing level (milling level of about 92%), and tempered. The aroma may be absorbed into the inner layer of the rice grain.

Note that the milled rice mixing and stirring device, the rice grain humidifying device, the rice grain pressing device, and the rice polishing device are not limited to the configurations shown in the drawings, and can of course be modified as appropriate.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention involves mixing and stirring high-quality rice bran to adhere it to polished rice, followed by humidification and pressurization to allow the components of the rice bran to permeate into the inner layer of the rice grain. Since the rice is polished to a predetermined level of polishing by friction polishing, the drawbacks of the conventional equipment and methods described above can be eliminated, and the quality of polished rice can be improved by adsorbing water-soluble nutrients and aromas in the rice bran to the inner layer of the rice grain. ,
Since the refining time is shortened by the pressurizing action, rice milling efficiency can be improved, and the humidification and refining section can be downsized, reducing construction costs.It also produces high-quality polished rice with a glossy surface without grain cracks. This has effects such as reliable mass production.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of the rice polishing device of the present invention;
FIG. 2 is an enlarged sectional view of the humidification, pressurization and tempering device for mixed polished rice.

Claims (4)

[Claims] (1) Rice bran powder is mixed and stirred to adhere to white rice whose surface layer has been properly milled, then humidified and pressurized to allow the components of the bran powder to penetrate into the inner layer of the rice grain, and then friction-polished rice A rice milling method characterized by milling rice to a predetermined level of polishing. (2) The rice polishing method according to claim (1), wherein the friction rice polishing is wet friction rice polishing. (3) Integrated rice milling by installing a rice grain pressurizing device in the post-process of the rice grain humidifying device, which is provided with a mixing and stirring device for polished rice using rice bran powder in the previous process, and a friction rice polishing device in the post-process of the pressurizing device. A rice milling device characterized by forming a process. (4) The rice polishing device according to claim (3), wherein the friction rice polishing device is a wet friction rice polishing device.