JP2014034026A - Wash-free rice manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wash-free rice manufacturing method capable of manufacturing a large quantity of wash-free rice of an excellent and stable quality for a short time period, by injecting overheated steam of a high temperature to eliminate the rice bran left on the surface of polished rice quickly and reliably, and by performing a sterilization and egg-killing and insect-killing on the rice grain surfaces simultaneously.SOLUTION: A wash-free rice manufacturing method comprises the steps of: feeding overheated steam 2 of a high temperature into the inside of a duct 4 arranged vertically; continuously pouring polished rice 3a or a material for non-polished rice 3 down from an upper portion of the duct 4; bringing the polished rice 3a into contact with the overheated steam 2 while falling down in the duct 4 thereby to remove the rice bran existing on the surface of the polished rice 3a and to perform sterilization, egg-killing and insect-killing simultaneously; and then discharging the polished rice 3a continuously from below the duct 4.

Description

  The present invention does not require rice washing at the time of cooking rice, and can easily and quickly remove the wrinkles remaining in the fine grooves on the surface without damaging the surface of the rice grain. The present invention relates to a method for producing washing-free rice.

In recent years, non-washed rice has been distributed, which eliminates the need for water washing during cooking and reduces the cooking work in housework. This washing-free rice can be made by milling milled rice that has been milled by a rice milling machine (with the rice skin removed and ready to cook) for a short period of time and then dewatering and drying. Milled rice polished with a polishing brush, etc., or milled rice milled with a milling machine, added with sticky substances such as starch and koji, and stirred and mixed in this state to remove koji Etc. are known.
In such a washing-free rice production method, the paste powder layer (Aleuron layer) remaining in the recesses on the surface of the rice grain that could not be removed by milling is further milled in water or removed by further polishing. It is further washed with sticky substances such as starch and rice bran, and finished without washing.

The definition of washing-free rice is being studied based on the turbidity of water (turbidity) when washing-free rice is put into water at the initiative of the Food Agency, and the measurement method of the Food Agency method is shown. However, in the end, the definition of no-wash rice has not been decided. For this reason, in the present specification, those having a turbidity of 28 ppm or less as defined by the turbidity measurement method adopted by the National Washless Rice Association are defined as “washless rice”.
In the turbidity measuring method, washing-free rice is put in a certain amount of water, and the amount of soot that dissolves by shaking, that is, the turbidity of water, is judged. The conditions in this measurement method are as follows: the amount of unwashed rice as a sample is 5 g, the amount of tap water is 400 ml, the water temperature is 20 ° C., the amplitude of shaking is 40 mm, the shaking frequency is 150 times / minute, Shaking time is 30 seconds and the turbidimeter used is “Nippon Denshoku”.

By the way, in such a method for producing washing-free rice, since the thickness of the paste powder layer is very thin, a high level of technology is required to prepare an ideal yield of about 92% in the milling process using a rice mill. , Had a problem of cost.
Further, the removal of wrinkles by polishing has a problem that the surface of the rice grains is scratched by the abrasive grains, and fine wrinkles enter the flaws on the surface of the rice grains in the subsequent process, and are easily reattached.
Furthermore, in the method of removing the koji by stirring and mixing with the adhesive substance added, the added koji is easily oxidized and rotted, which causes the problem that the quality of unwashed rice is deteriorated and the smell is likely to adhere. Was.

Then, the manufacturing method of the non-washing rice which eliminates these problems is also proposed (for example, refer patent documents 1-3).
In the manufacturing method of Patent Document 1, after adding water to the polished rice, the polished rice and the ground pulverized rice are mixed and stirred to polish the polished rice to remove wrinkles remaining on the surface of the polished rice. Then, the polished rice and the pulverized rice are separated.
In addition, the production method of Patent Document 2 adds water to the polished rice to soften it, and polishes the polished rice by mixing and stirring the polished rice and the granular material heated to the gelatinization temperature or higher. After the rice cake remaining on the surface of the white rice is removed with the granular material, the polished rice and the granular material are separated.
Furthermore, the manufacturing method of patent document 3 adds rice bran to raw material rice, mixes it with cooling, and classifies the obtained non-washed rice and rice bran.

JP 2001-259441 A JP 2002-1138 A JP 2002-248359 A

However, in the method for producing washing-free rice described in the three patent documents mentioned above, crushed rice, granules, and rice cake are added, and the rice cake remaining on the surface of the polished rice is removed while mixing and stirring. The process of removing rice bran is complicated and it takes a lot of time for the removal process, and it is necessary to separate these pulverized rice, granular material, rice bran and milled rice, making it difficult to produce a large amount of unwashed rice in a short time. There was a risk of incurring high costs.
In addition, in the above-described method for producing washing-free rice, in order to obtain washing-free rice having a turbidity of a standard value or less, only the removal of rice cake remaining on the surface of polished rice is performed. Since no treatment such as insecticidal treatment was carried out, there was a hygienic problem, and there was a problem that it could not be stored or transported with good quality and stable quality.

  The present invention has been made in view of such circumstances, and its purpose is to quickly and surely remove the soot remaining on the surface of the polished rice by injecting high-temperature superheated steam and to kill the surface of the rice grain. An object of the present invention is to provide a method for producing washing-free rice which can be produced in a large amount in a short time with good and stable quality washing rice by performing sterilization, egg killing and insecticidal treatment simultaneously.

  In order to solve the above-described problems of the prior art, the present invention supplies hot superheated steam to the inside of a pipe line arranged along the vertical direction, and is a raw material for washing-free rice from the upper part of the pipe line. The milled rice is continuously added, and the milled rice is brought into contact with the superheated steam while dropping the milled rice inside the pipe to remove the wrinkles present on the surface of the milled rice, and at the same time, sterilization, egg killing and insecticide Then, the milled rice is continuously discharged from the lower part of the conduit.

  In the present invention, the superheated steam has a flow rate in a temperature range of 400 to 700 ° C. when milled rice is introduced into a pipe-shaped pipe having an inner diameter of 75 mm and a length of 1000 mm at a capacity of 1200 kg / h. Superheated steam supplied at 60 kg / h.

As described above, the method for producing washing-free rice according to the present invention supplies high-temperature superheated steam to the inside of a pipe line arranged in the vertical direction, and at the same time, the fine rice that is the raw material for washing-free rice from the top of the pipe line. While continuously adding white rice, letting the polished rice fall inside the conduit and contact with the superheated steam to remove the wrinkles present on the surface of the polished rice, and at the same time, sterilization, egg killing and insecticidal treatment After that, the polished rice is continuously discharged from the lower part of the conduit, so that the wrinkles remaining in the fine grooves on the surface can be quickly and easily removed without damaging the surface of the rice grains. The surface of the rice grain can be sterilized, killed, and killed at the same time, and can be produced continuously in large quantities in a short time with stable turbidity and a stable quality. In addition, the non-washed rice after the treatment of sterilization, egg killing, and insecticidal treatment can be stored in a good state for a long period of time, and can provide an inexpensive and superior quality product.

In the present invention, the superheated steam has a flow rate in a temperature range of 400 to 700 ° C. when milled rice is introduced into a pipe-shaped pipe having an inner diameter of 75 mm and a length of 1000 mm at a capacity of 1200 kg / h. Since it is superheated steam supplied at 60 kg / h, even if the temperature of the white rice discharged after the treatment is about 45 ° C., it is allowed to cool as it is, and it is possible to continuously obtain washing-free rice as a product. Thus, the running cost can be reduced.

It is a perspective view which shows roughly the manufacturing apparatus which enforces the manufacturing method of the non-washing rice concerning embodiment of this invention. It is a conceptual diagram which shows the dimensional relationship of the pipe line which comprises the manufacturing apparatus of FIG.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.
FIG. 1 shows an overall view of a washing-free rice production apparatus according to an embodiment of the present invention, and FIG. 2 shows a conceptual diagram for explaining the dimensional relationship of pipes constituting the production apparatus of FIG.

As shown in FIG. 1, the manufacturing apparatus 1 which implements the manufacturing method of the non-washing rice which concerns on embodiment of this invention wash | cleans superheated steam (superheated steam in this embodiment) 2 such as superheated steam and superheated gas steam. By removing the rice cake existing on the surface of the grain of the polished rice 3a by bringing it into contact with the polished rice 3a, which is the raw material of the rice, at the same time sterilizing microorganisms, eggs, pests, sterilization and insecticidal treatment, Wash-free rice 3 is produced from polished rice 3a refined by a machine.
The manufacturing apparatus 1 for carrying out the manufacturing method of the present embodiment mainly includes a pipe-like pipe line 4 arranged along the vertical direction, and a steam supply means 5 provided at an intermediate part in the vertical direction of the pipe line 4. The separator 6 is connected to the lower part of the pipe 4 and forcibly separates the superheated steam 2 and the polished rice 3a.

The superheated steam 2 used in the present embodiment is obtained by further adding and heating the steam. For example, as shown in FIG. 2, a pipe shape having an inner diameter D of 75 mm and a length L of 1000 mm. This is superheated steam that is supplied at a flow rate of 60 kg / h in the temperature range of 400 to 700 ° C. when the milled rice 3a is introduced into the pipe 4 at a capacity of 1200 kg / h.
Here, the reason why the inner diameter D and the length L of the pipe line 4 are set to the above-described sizes is convenient for installing the manufacturing apparatus 1 for the non-washed rice 3 in a general-sized non-washed rice manufacturing factory. This is because the equipment cost can be reduced. Moreover, the reason why the input amount of the polished rice 3a is set to 1200 kg / h is that the production cost of the non-washed rice 3 can be suppressed, and it is considered to be an optimum amount for transporting and storing the produced non-washed rice 3. . Furthermore, the temperature and flow rate of the superheated steam 2 are set to the above-mentioned sizes because the straw existing on the rice grain surface of the polished rice 3a introduced at a rate of 1200 kg / h is removed, and at the same time, microorganisms, eggs, pests, etc. This is because it is suitable for carrying out sterilization, egg-killing, and insecticidal treatment of foods quickly and reliably.

The pipe line 4 of the present embodiment is a pipe-like pipe whose horizontal cross section is formed in a circular shape, and is configured such that the process is performed by bringing the superheated steam 2 and the polished rice 3a into contact with each other. Such a pipe line 4 is supported vertically by attaching the upper and lower intermediate portions to a frame or the like of a rigid member. Further, the inner diameter D and the length L in the vertical direction of the pipe line 4 are used for removing scum remaining in the fine grooves on the surface of the polished white rice 3a that is continuously added, sterilization, egg killing, and insecticidal treatment. It is set according to the required time and the like, and the linear outer periphery is covered with a heat insulating material or the like so that heat does not escape to the surroundings.
An upper portion of the pipe 4 is provided with a feeding portion 7 such as a hopper for continuously feeding the polished rice 3a. The charging portion 7 is provided with a polished rice 3a from a storage, a transporting vehicle or the like not shown. A transport duct (not shown) for transporting and dropping is connected. Or the input part 7 may be comprised so that the polished rice 3a may be dropped directly. The hopper or the like installed in the charging unit 7 is not covered with a heat insulating material or the like, and is attached as it is.
Further, at the lower part of the pipe line 4, there is provided a discharge unit 8 for discharging the washing-free rice 3 which has been subjected to the removal process of the soot, the sterilization, the egg-killing and the insect-killing process by the superheated steam 2 during the fall. The superheated steam 2 and the non-washed rice 3 are discharged together from the discharge unit 8.

As shown in FIG. 1, the steam supply means 5 of the present embodiment is provided at an intermediate portion in the vertical direction of the pipeline 4 and is configured to supply superheated steam 2 into the pipeline 4. For this reason, the steam supply means 5 has a supply pipe 9 for ejecting the superheated steam 2 inside the pipe 4, and the tip of the supply pipe 9 is connected to communicate with the inside of the pipe 4. ing. The other end of the supply pipe 9 is connected to a steam supply source (not shown) such as a boiler via a steam line (not shown).
Further, the supply pipe 9 is disposed obliquely downward so as to intersect with the axis of the pipe line 4, whereby the superheated steam 2 ejected from the tip portion is inside the pipe line 4. The superheated steam 2 is more evenly and instantaneously contacted with the milled rice 3a that is falling. In addition, such an inclined arrangement of the supply pipe 9 causes the superheated steam 2 to rise toward the charging portion 7 of the pipe line 4 in combination with the pipe line 4 having a circular shape in the horizontal section. It has a function to prevent. The supply pipe 9 may be disposed horizontally so as to be orthogonal to the axis of the pipe line 4.

As shown in FIG. 1, the separator 6 according to the present embodiment has a box-shaped casing 10 whose inside communicates with the discharge portion 8 of the conduit 4, and the casing 10 includes superheated steam. 2 and a guide member (not shown) having a function of forcibly separating the polished rice 3a. The guide member is positioned below the pipe line 4 and is opposed to the discharge portion 8 and is disposed obliquely from the upper part to the lower part with a space from the bottom surface. For this reason, the guide member is configured to change its direction in the horizontal direction when the superheated steam 2 falling vertically hits the upper surface. Moreover, the guide member is formed such that the non-washed rice 3 that is the processed polished rice 3a that has fallen by hitting the upper surface is guided to a discharge port described later.

On the other hand, the side part of the casing 10 of this embodiment is provided with a steam discharge port (not shown) for discharging the superheated steam 2 separated by the guide member to the outside. Since the temperature of the superheated steam 2 discharged from the steam outlet is high even after the processing to the polished rice 3a, it may be reused as a heat source for the steam supply source, or as a heat source for other devices. It may be used.
Further, on one side of the bottom bottom portion of the casing 10, there is an unwashed rice discharge pipe 11 for discharging the unwashed rice 3, which is the milled rice 3 a after the separation of the superheated steam 2 against the guide member, to the outside (not shown). ). The washing-free rice discharge pipe 11 is disposed so as to be inclined downward toward the outside. Below the discharge pipe 11, the washed non-washed rice 3 after being dropped is stored in a storage box, a transport vehicle, etc. A belt conveyor and the like are installed.

Next, the manufacturing method of the non-washing rice 3 which concerns on embodiment of this invention is demonstrated using the manufacturing apparatus 1 of the non-washing rice 3 shown in FIG.1 and FIG.2.
First, the steam supply means 5 is driven to send out superheated steam 2 having a temperature of 600 ° C. from a steam supply source (not shown), and 65 kg of superheated steam 2 is supplied from the supply pipe 9 to the inside of the pipe 4 via a steam pipe (not shown). Supplied at a flow rate of / h. In this state, the raw milled rice 3a, which has been refined by a rice milling machine (not shown) and transported from a storage, a transporting vehicle, etc., is continuously dropped at a rate of 1200 kg / h onto the feeding section 7 at the upper part of the pipeline 4. . The dropped polished rice 3a comes into contact with the superheated steam 2 supplied while freely falling inside the pipe 4. At this time, straw, microorganisms, eggs, pests and the like present on the surface of the rice grains of the polished rice 3a are removed by the high-temperature superheated steam 2, and at the same time, sterilization, ovulation and insecticidal treatment are performed.

Next, the polished rice 3a to which the superheated steam 2 adheres is discharged to the outside from the discharge portion 8 at the lower part of the pipe line 4, and falls into the separator 6 positioned in communication with the lower part. Then, the superheated steam 2 and the polished rice 3a that have fallen into the separator 6 hit the upper surface of an inclined guide member (not shown) and are forcibly separated by a mass difference, an impact force, or the like. . That is, of the superheated steam 2 and the polished rice 3a hitting the guide member, the superheated steam 2 is changed in the horizontal direction by the guide member and flows toward the steam discharge port. The superheated steam 2 that has reached the steam discharge port returns to the steam supply source via the recovery pipe and is reused as a heat source.
On the other hand, the polished rice 3a after the sterilization, egg-killing and insecticidal treatment falls while moving along the upper surface of the guide member, is guided to the washing-free rice discharge pipe 11, and is washed on the belt conveyor (not shown) as washing-free rice 3. It is discharged continuously. The washing-free rice 3 in this state has an article temperature of about 45 ° C., so it is air-cooled to room temperature. Thereafter, the unwashed rice 3 after the treatment is transported to a storehouse or a transport vehicle (not shown), and the manufacturing process is completed.

Turbidity, which is one of the physical conditions of the non-washed rice 3 treated by the production method of the present embodiment, was measured. The measurement method was as follows: 5 g of treated unwashed rice 3 was put in a container, 400 cc of tap water was poured into the container for this amount of unwashed rice 3, and this was shaken for 30 seconds. Thereafter, the turbidity of water was measured using a turbidimeter (TB-31 manufactured by Toa DKK) (based on Japanese Industrial Standard K0101). The condition of non-washed rice is that this turbidity is 40 to 70 ppm or less. As an example of the results, the turbidity of unwashed rice 3 treated with the production method of the present embodiment was 22 ppm while the turbidity of untreated rice was 45 ppm. Moreover, even if the whiteness of the processed non-washed rice 3 was visually compared with the polished white rice 3a before processing, there was no difference.

Thus, in the manufacturing method of the non-washing rice 3 which concerns on embodiment of this invention, the hot superheated steam 2 is jetted from the supply pipe | tube 9 of the vapor | steam supply means 5 inside the pipe line 4 arrange | positioned along the up-down direction. The milled rice 3a is continuously fed from the feeding section 7 at the upper part of the pipe 4 and is brought into contact with the superheated steam 2 while dropping the milled rice 3a inside the pipe 4, so that the milled rice 3a At the same time as removing rice bran on the surface of the rice grain, sterilization, ovulation and sterilization treatment and sterilization are performed on microorganisms, eggs, pests, etc. existing on the surface of the rice grain of the polished rice 3a. Because the separator 6 separates the superheated steam 2 and the polished rice 3a, and then discharges the polished rice 3a continuously from the unwashed rice discharge pipe 11 at the lower part of the pipe 4 to produce the washed rice 3. The rice cake remaining on the surface of the rice grain without damaging the surface It is possible to quickly and easily removed from the rice 3a, killing sterile rice grain surface, ovicidal, it is possible to perform insecticidal simultaneously, a pre-washed rice 3 can be manufactured continuously in large quantities in a short time. Moreover, the non-washed rice 3 obtained by the production method according to the embodiment of the present invention has a stable quality with a turbidity below a reference value, can be stored for a long time in a good state, and is less expensive than the conventional one. Can provide excellent quality products.

  While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

  For example, in the above-described embodiment, the separator 6 that forcibly separates the superheated steam 2 and the polished rice 3 a is provided at the lower portion of the pipe 4, but without the separator 6, The washed rice 3 may be produced by discharging the polished rice 3a together from the lower part of the pipe 4 and separating the superheated steam 2 from the polished rice 3a by air cooling.

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus of washing-free rice 2 Superheated steam 3 Washing-free rice 3a Polished rice 4 Pipe line 5 Steam supply means 6 Separator 7 Input part 8 Discharge part 9 Supply pipe 10 Casing 11 Wash-free rice discharge pipe

Claims (2)

While supplying high-temperature superheated steam to the inside of the pipe line arranged along the vertical direction, the milled rice, which is a raw material of unwashed rice, is continuously fed from the upper part of the pipe line, and the inside of the pipe line While dropping the polished rice, it is brought into contact with the superheated steam to remove the cocoons present on the surface of the polished rice, and at the same time, sterilization, egg-killing and insecticidal treatment are performed, and then the polished rice is removed from the lower part of the conduit. A method for producing washing-free rice, characterized by being continuously discharged.   The superheated steam is supplied at a flow rate of 60 kg / h in a temperature range of 400 to 700 ° C. when the milled rice is charged at a capacity of 1200 kg / h into a pipe-shaped pipe having an inner diameter of 75 mm and a length of 1000 mm. The method for producing wash-free rice according to claim 1, wherein the superheated steam is produced.