JPH02265448A - Processing method for needless-to-wash rice - Google Patents

Abstract

PURPOSE:To obtain the title rice needless for washing with water when cooked and capable of giving boiled rice of good taste by polishing brown rice followed by humidification to a specified moisture content or higher and by further adding moisture to the resultant polished rice surface and feeding hot air to effect gelatinization of only the surface layer of the polished rice grains. CONSTITUTION:A rice milling machine 100 is fed with brown rice to carry out rice polishing, and the resultant polished rice is fed to a rice abrader 200 where adhered saccharide, etc., on the rice grain surface are removed to make polished rice with gloss. Thence the polished rice is carried into a humidifier 300 where said rice is humidified to a moisture content to >=14.5wt.%. The humidified rice is then introduced into a surface treatment apparatus 400 where moistened air is fed from a humidifying air feeder 403 to further add moisture to the polished rice surface, and at the same time, prior to penetrating said moisture into polished rice grains, hot air of >=75 deg.C is fed for a short time from a hot air feeder 410 to effect gelatinization of only the surface layer of the polished rice grains. Thence, the objective needless-to-wash rice thus obtained is fed to a metering-and-packaging apparatus 500, metered and packed into a gas barrier-natured bag followed by replacing the air in the bag with an inert gas and then carrying out sealing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for processing rice without washing, which does not require the effort of washing (sharpening) rice prior to cooking, for obtaining so-called rice without washing.

[Conventional technology]

Conventionally, techniques for making rice grains wash-free are known, for example, in Japanese Patent Publication No. 47428/1983 and Japanese Patent Application Laid-open No. 125853/1983. In other words, the former is white rice that has been polished to a high degree of whiteness and polished to completely remove the attached bran.
The humidity is adjusted to 15% or more and sealed and packaged, and the latter method involves blowing hot air of 100°C or higher for less than 30 seconds while the moisture added to the surface of the white rice grain does not penetrate into the inner layer of the rice grain to glue the surface of the white rice grain. It is then allowed to cool down naturally.

[Problem that the invention seeks to solve]

By the way, the "instantly cooked rice" disclosed in Japanese Patent Application Laid-open No. 59-125853 is made by eluting paste essence from the destroyed cell membranes on the surface of the rice grains during soaking before cooking, causing the rice to lose its shape and become sticky. There will be no rice. Also, when soaking, the glue leaches out and the water becomes cloudy, so you have to wash it again and again.

On the other hand, in the polished rice processing method disclosed in Japanese Patent Publication No. 63-47428, the surface of the polished rice grains is gelatinized, so the water does not become cloudy during soaking, and the storage property is good, but the speed at which water permeates into the rice grains during cooking is low. Each method had problems in that the inner layer of the rice grain was not completely gelatinized at the same time, resulting in rice with a hard core.

The technical object of the present invention is to solve these problems and provide a method for processing rice without washing that can cook rice with good taste.

[Means for solving problems]

In order to solve the above problems, in the washing-free rice processing method of the present invention, after rice milling, water is further added to the surface of the polished rice grains which have been humidified to a moisture content of 14.5% or more, and the added water is absorbed into the polished rice grains. In this method, hot air of 75°C or higher is supplied for a short period of time to gelatinize only the surface layer of the polished rice grain, while it does not penetrate into the inner layer of the rice grain.

Further, after rice polishing, hot and humid air of 75° C. or higher may be supplied for a short time to the surface of the polished rice grain that has been humidified to a moisture content of 14.5% or higher to gelatinize the surface of the polished rice grain.

The polished rice with only the surface layer gelatinized as described above can also be packed in a gas-barrier bag in a non-oxidized state.

Furthermore, it is even more effective to polish the rice at the same time as polishing it with a rice polishing yield of 90% or less.

[Action and effect]

Moisturize polished rice grains, that is, white rice, by an appropriate method,
The moisture content should be 14.5% or more. Moisture is further added to this polished rice, and hot air of 75°C or higher is supplied for a short period of time until the moisture penetrates into the inner layer of the polished rice grains. During gelatinization (gelatinization), only a thin layer (50 to 200 μm) on the grain surface becomes pasty.

When cooking rice, if the white rice is immersed in water and heated without washing, the white rice has a moisture content of 14.5% or more, so it will not crack under water, and the surface layer will be gelatinized. As a result, the paste sperm does not elute from the cells on the surface.

Therefore, the water does not become cloudy and washing is not necessary, and
Since a certain amount of moisture permeates into the inner layer of the rice grain, the core does not become hard due to lack of moisture, and the whole grain is evenly gelatinized, resulting in delicious rice.

In addition, by supplying hot and humid air at 75°C or higher for a short period of time to the surface of polished rice grains that have been humidified to a moisture content of 14.5% or higher,
Only the surface layer can be gelatinized.

Storing property is improved by packing the polished rice treated in this way into a gas-barrier bag in an unoxidized state.

Furthermore, by milling the rice to a yield of 90% or less, the bran layer remaining on the surface of the polished rice is reduced and the bran odor is eliminated. This is further promoted by making the surface of the rice grain smooth through the polishing process, making it suitable for use as no-rinse rice.

[Embodiments of the invention]

Hereinafter, a preferred embodiment for carrying out the present invention will be described with reference to the drawings.

First, in the rice milling device 100, a feed roller 103 and a milling roller 104 are attached to a rotatably horizontal main shaft 102, and a supply hopper 10f is provided above the feed roller 103, surrounding the milling roller 104. The porous wall bran removing cylinder 105 is installed horizontally, and the porous wall bran removing cylinder 1
A resistive lid 110 is provided at the discharge port 112 at the terminal end of 05. Further, a bran discharge hopper 106 is provided below the porous-walled bran removing cylinder 105, and the lower end of the bran discharge hopper 106 is connected to a fan 109. This fan 109 is
Bran discharge hot/(-106, porous wall bran removing cylinder 105, blast groove 111 with milling roller 104 formed and blast hole 1
08 to the hollow part of the main shaft 102, and one end of the hollow part faces outside the machine.

A rice polishing device 200 is installed in the next step of the rice polishing device 1000 via a grain lifting machine E1. In this rice polishing device 200 as well, a feed roller 203 and a milling roller 204 are fixed to a main shaft 202, and a porous-walled bran removing cylinder 205 is provided surrounding the milling roller 204. Furthermore, a bran discharge hopper 206 and a fan 207 connected to the lower end of the bran discharge hopper 206 are disposed below the porous-walled bran removal cylinder 205. Furthermore, the hollow part 208 of the main shaft 202 communicates with the fan 207 via the blow hole 209, the wind-resistant groove 210 of the milling roller 204, the porous-walled bran removal cylinder 205, and the bran discharge hopper 206, and the end of the hollow part 208 A nozzle 213 connected to a water tank 211 and a high-pressure air generator 212 is shown. The discharge port 214 is provided with a resistance lid 215 similarly to the rice polishing apparatus 100.

A humidifying device 300 is provided following the rice polishing device 200.

A cylinder 301 is provided with a supply port 302 at the lower end and a discharge port 303 at the upper end, and a screw 304 is provided inside the cylinder 301 so as to be rotatable by a motor 305 . The screw shaft 306 of the screw 304 is hollow and has a number of openings 307 covered with a mesh (not shown) in its curved surface, and the upper end of the screw shaft 306 is connected to the inlet of a blower 309 via a suction pipe 308. As a result, the hollow portion of the screw shaft 306 and the blower 309 are connected. On the other hand, the discharge port of the blower 309 communicates with the inside of the cylinder 301 through a blow pipe 310 to form a circulating air path. In addition, the air intake pipe 308 has a branch pipe 3 with an air cutoff valve 311 in between.
12.313, and each branch pipe 312.313 has valve 3.
Install 14,315. Furthermore, a plurality of nozzles 316 for injecting humidified air are provided near the lower half of the cylinder 301. The nozzle 316 is connected to a water tank and a high pressure air generator (see rice polishing device 200). And supply port 30
2 and the discharge port 303 are each equipped with an air cutoff valve 317 to form the inside of the cylinder 301 airtight.

A surface treatment device 400 is disposed after the humidification device 300. The surface treatment device 400 includes a rotary porous wall tube 402 provided in a casing 401, a humidified air supply device 403, and a hot air supply device 410. The porous wall rotating cylinder 40
2 is rotatably supported by a shaft 404, and is suspended horizontally at a slightly lower side with a discharge port 405 provided at the lower end of one side of the casing 401, and a supply hopper 406 is provided at the upper end on the opposite side of the discharge port 405. A humidified air supply device 403 consisting of a fog generator 407, a fan 408 and a blow pipe 409 is connected to this supply hole/(-406).Furthermore, a hot air generator 411 is provided to blow hot air into the casing 401. One end of the blower pipe 413 is connected to the outlet of the fan 412, and a nozzle 414 attached to the other end of the blower pipe 413 is made to face the end of the porous wall rotary cylinder 402.

A measuring and packaging device 500 is disposed in a downstream process of the surface treatment device 400. The weighing and packaging apparatus 500 includes a bag making section that forms a rolled tube film 501 having gas barrier properties into a bag shape, a weighing/filling section, a packaging section, a gas filling/degassing section, etc. (not shown).

Next, specific operations in the above embodiment will be explained. Brown rice, which is a raw material, is first milled by a rice milling device 100 to a yield of 90% or less.

That is, the brown rice put into the supply hopper 101 is
A feed roller 103 fixed to the main shaft 102 and a milling roller 104 stir and flow under high pressure, and the bran layer on the surface of the grains is peeled off due to grain-by-grain friction. The bran powder peeled off from the brown rice immediately leaks from the porous-walled bran removal cylinder 105 and falls into the bran discharge whit 7106 below X0. At this time,
The main shaft 10 is used to promote bran removal and to cool the rice grains.
2 hollow part 107, blowhole 1 opened on the circumferential surface of the main shaft 102
08, ventilation is performed by the fan 109 through the wind-resistant groove 111 of the milling roller 104, the porous-walled bran removal tube 105, and the bran discharge hopper 106.

The rice grains, which have become polished rice with the bran layer almost completely removed, are discharged against the resistance lid 110 and are supplied to the supply hopper 201 of the rice polishing device 200 via the grain lifting machine E1. In this rice polishing device 200 as well, the feed roller 203, milling roller 204, and resistance lid 215 that rotate together with the main shaft 202 produce stirring and fluidizing effects under high pressure. The wet air is blown into the wind-resistant groove 210 of the milling roller 204.
Since the rice grains are supplied to the rice grains, the moment the rice grain surfaces become moist and softened, the adhering bran and the like on the rice grain surfaces are removed by grain-by-grain friction, resulting in glossy rice with a smooth surface.

The polished rice that has become glossy is then fed to the supply port 3 of the humidifier 300.
02 and is exposed to wet air ejected from a nozzle 316 while being sent upward by the screw 304. As a result, the grain surface becomes smoother due to grain-to-grain friction, and moisture permeates to the inner layer of the rice grain. At this time, high-humidity air is circulated by the blower 309 to promote humidification of the rice grains, but by operating the air cutoff valve 311 etc. to maintain the inside of the cylinder 301 under pressure, the humidification of the polished rice is further improved. It can also be done efficiently.

In this way, polished rice has reached a moisture content of 14.5% or more, which is a safe moisture content that does not cause underwater cracks when immersed in water.
It is further transferred to the supply hopper 406 of the surface treatment apparatus 400. After being exposed to the humid air from the humidified air supply device 403, the polished rice placed in the supply hopper 406 is immediately supplied to the porous wall rotating cylinder 402 where it is stirred and fluidized.
It comes into contact with hot air of approximately 100° C. blown from the hot air supply device 410. As a result, the surface layer of the rice grain has a high moisture content, e.g.
Immediately after the water reaches about 50%, and before this moisture penetrates into the inner layer of the rice grain, it comes into contact with hot air at about 100℃ for a short time, for example, about 30 seconds, and the surface layer of the polished rice grain, for example, about 50μ
m becomes α. In this way, only the surface of the white rice grain is gelatinized by applying a temperature and moisture to the surface of the white rice grain for a short period of time that satisfy the conditions for gelatinization (gelatinization) of raw starch.

The polished rice whose surface layer has become gelatinized is sequentially supplied to the weighing and packaging device 500, where it is weighed and filled into an air-blocking bag, and then the oxygen in the bag is removed by a gas suction pipe in the filling and degassing section. At the same time, nitrogen gas or the like is injected through an inert gas injection tube and the product is sealed and packaged.

[Brief explanation of drawings]

The drawing is a partially cutaway sectional view for carrying out the washing-free rice processing method of the present invention. 100... Rice polishing device, 101... Supply hopper 10
2... Main shaft, 103... Feed roller, 104
... Milling roller, 105 ... Porous wall bran removal cylinder,
106... Bran discharge hopper, 107... Hollow part, 1
08...Blowhole, 109...Fan, 110...
Resistance lid, 111... Windproof groove, 112... Outlet, 2
00... Rice polishing device, 201... Supply hopper, 20
2... Main shaft, 203... Feed roller, 204
... Milling roller, 205 ... Porous wall bran removal cylinder,
206... Bran discharge hopper, 207... Fan, 2
08...Hollow part, 209...Blowhole, 210...
Windproof groove, 211... Water tank, 212... High pressure air generator, 213... Nozzle, 214... Outlet,
215... Resistance lid, 300... Humidifier, 301... Cylinder, 302...
- Supply port, 303... Discharge port, 304... Screw 305... Motor, 306... Screw shaft,
307... Opening, 308... Air intake pipe, 309...
Blower, 310...Blast pipe, 311...Air cutoff valve, 312°313...Branch pipe, 314,315...Valve, 316...Nozzle, 317...Air cutoff valve, 400. ...Surface treatment device, 401...Casing,
402... Porous wall rotating cylinder, 403... Fan, 40
9... Air pipe, 410... Hot air supply device, 500...
...Measuring and packaging device, 501...Rolled tube film.

Claims (5)

[Claims] (1) After rice milling, further water is added to the surface of the polished rice grains which have been humidified to a moisture content of 14.5% or higher, and hot air of 75°C or higher is applied while the added water does not penetrate into the inner layer of the polished rice grains. A washing-free rice processing method characterized by supplying for a short time to gelatinize only the surface layer of polished rice grains. (2) After rice milling, hot and humid air of 75°C or higher is supplied for a short period of time to the surface of the polished rice grains, which have been humidified to a moisture content of 14.5% or higher, to gelatinize only the surface layer of the polished rice grains. Wash-free rice processing method. (3) Claim (1) wherein polished rice with only the surface layer gelatinized is packed in a gas-barrier bag without oxidation.
) or the wash-free rice processing method described in (2). (4) Claim (1) made by milling rice to a yield of 90% or less
, (2) or (3), the method for processing rice without washing. (5) Claim (1) comprising a polishing process along with rice polishing.
-(4) The method for processing rice without washing according to any one of the above.