Method and device for producing rice noodles

Abstract

The present invention provides a method for producing rice flour and a device therefor. The method comprises: a coarse grinding step for coarsely grinding raw material rice; a crack generation step for generating fine cracks in the water-permeable layer of the raw rice, which has been coarsely pulverized by the coarse pulverizing step; a water addition step for adding water to the raw rice which has been coarsely crushed and has been cracked by the coarse crushing step and the crack generation step; a tempering step in which the moisture of the raw rice to which the moisture has been added in the water adding step is permeated to homogenize the moisture content; and a fine grinding step for finely grinding the raw rice, the moisture content of which has been homogenized in the tempering step.

Description

Technical Field

[0001] The invention relates to a method and a device for making rice noodles. Background Art

[0002] Conventionally, the following rice noodle manufacturing methods and rice noodle manufacturing systems are known as rice noodle manufacturing methods and rice noodle manufacturing systems.

[0003] Patent document 1 discloses a rice noodle manufacturing system for manufacturing rice noodles by finely grinding raw rice of brown rice or white rice. The rice noodle manufacturing system X includes: a washing device R for washing the raw rice with water, a moisture adjustment device S for adjusting the moisture of the washed raw rice, a coarse grinding device T for coarsely grinding the raw rice with adjusted moisture to produce coarsely ground rice, a water adding device U for adding water to the coarsely ground rice, a slow resuscitation device V for adjusting the moisture by infiltrating water into the coarsely ground rice, and a fine grinding device W for finely grinding the coarsely ground rice with adjusted moisture content (see Figure 7 ).

[0004] Brown rice is covered with a husk (bran = pericarp, seed coat and aleurone layer) (refer to Fig. 8A ), therefore, even if the brown rice is immersed in water or water is added to the brown rice, the water will not penetrate into the core of the brown rice in a short time, and a long time (15 to 16 hours) is required for the water to penetrate. In order to solve this problem, in Patent Document 1, the brown rice is coarsely crushed (2 to 4 petals) by a coarse crushing device T (refer to Figure 8B ), a fracture surface not covered by the outer skin (bran) is formed on the coarsely crushed brown rice (coarse crushing process). Then, when water is added to the fracture surface of the coarsely crushed brown rice by the water adding device U (refer to Figure 8C ), water will adhere to the fracture surface of the crushed brown rice (water adding process). Then, for the crushed brown rice after water addition, water will penetrate from the fracture surface, and the brown rice will be cooked in this state to adjust the water content (refer to Fig.8D ), thereby making the coarsely crushed brown rice reach the desired moisture content (about 30%) (slow recovery process).

[0005] As described above, if the brown rice is made into coarsely ground brown rice, the saturated moisture content (about 30%) can be reached in a short time, and rice flour (brown rice flour) can be produced efficiently. In particular, since the coarsely ground brown rice with a moisture content of about 30% is finely ground by wet grinding to allow moisture to penetrate into the brown rice, the damage to the starch layer is also small. Since the brown rice is coarsely ground, the damage to the starch layer can be reduced.

[0006] Second, since the brown rice is washed with water before being roughly ground, soil bacteria, soil and other pollutants adhering to the brown rice can be removed, which is hygienic (washing step).

[0007] Thirdly, since the water content attached to the brown rice is adjusted after washing the brown rice with water, the crushed brown rice can be suppressed from becoming powdery or pasty in the crushing step (water content adjustment step, crushing step).

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: Japanese Patent Application Publication No. 2012-50378 Summary of the invention

[0011] Problems to be solved by the invention

[0012] However, in the above-mentioned technology, the raw rice is washed with water by the washing device R before being roughly crushed by the crushing device T, so a large amount of water must be used for washing. In addition, there are problems such as high manufacturing cost and high energy cost associated with the wastewater treatment, which require wastewater treatment equipment after the water washing.

[0013] In addition, in the above-mentioned Patent Document 1, although water can penetrate from the fracture surface of the coarsely crushed brown rice, since the surface of the brown rice that is not the fracture surface is still covered with the outer skin (bran) through which water is difficult to penetrate, the water retention capacity near the outer skin (bran) of the brown rice as the raw material is insufficient, and when observing the brown rice grains as a whole, the distribution of water content is uneven, and there is a tendency for the resuscitation time of the resuscitation device V used to allow water to penetrate (distribute) throughout the entire raw rice to be prolonged.

[0014] In view of the above-mentioned problems, in an embodiment of the present invention, the technical problem is to provide a method and apparatus for manufacturing rice noodles, which do not require drainage treatment equipment, and the water retention capacity of the raw rice as a whole can be increased, and the refrigeration time for water to penetrate into the raw rice as a whole can be shortened.

[0015] Methods for solving problems

[0016] In order to solve the above-mentioned problems, in an embodiment of the present invention, there are: a coarse grinding step for coarsely grinding raw rice (brown rice, polished rice, unwashed rice, etc.), a crack generating step for causing fine cracks to be generated in the water-impermeable layer of the raw rice coarsely ground by the above-mentioned coarse grinding step, a water adding step for adding water to the raw rice coarsely ground and having cracks generated by the above-mentioned coarse grinding step and the above-mentioned crack generating step, a slow recovery step for causing water to penetrate into the raw rice to which water has been added by the above-mentioned water adding step to achieve a uniform moisture content, and a fine grinding step for finely grinding the raw rice whose moisture content has been uniformed by the above-mentioned slow recovery step.

[0017] In another embodiment, a screening process for screening the coarsely ground raw rice is provided between the coarse grinding process and the crack forming process, the coarsely ground particles screened in the screening process are transported to the crack forming process, and the fine particles screened in the screening process are transported to the water adding process, and the respective treatments are performed according to the particle size of the raw rice screened in the screening process.

[0018] Effects of the Invention

[0019] In an embodiment of the present invention, there are a coarse grinding step of coarsely grinding raw material rice, a crack forming step of generating fine cracks in a water-impermeable layer of the raw material rice coarsely ground in the coarse grinding step, a water adding step of adding water to the raw material rice coarsely ground and having cracks formed in the coarse grinding step and the crack forming step, a slow recovery step of allowing water to penetrate the raw material rice to which water has been added in the water adding step to achieve a uniform moisture content, and a fine grinding step of finely grinding the raw material rice whose moisture content has been uniformed in the slow recovery step. Thus, in the coarse grinding step, the raw material rice serving as the raw material is coarsely ground into 2 to 4 pieces, and then in the crack forming step, a plurality of fine cracks are generated in a portion of the surface layer of the coarsely ground raw material rice that is difficult to penetrate, and further in the water adding step, water is added to the raw material rice coarsely ground and having a plurality of fine cracks formed on the surface, and water is absorbed by penetrating from the plurality of fine cracks formed in the crack forming step in addition to the fracture surface of the raw material rice formed in the coarse grinding step. That is, water is rapidly absorbed into the starch layer in the center through two water channels, namely the fracture surface and the cracks.

[0020] In addition, since water channels are formed by the cracks generated in the crack generation step, the water retention of the raw rice as a whole can be increased. Therefore, the revival time for water to penetrate into the raw rice as a whole can be shortened compared with the past. Furthermore, since the water is fully absorbed into the starch layer of the raw rice, it is not necessary to provide an initial water washing step, and it is not necessary to provide a drainage treatment device.

[0021] In another embodiment, a screening process is provided between the coarse pulverizing process and the crack forming process to screen the coarsely pulverized raw rice. The coarsely pulverized particles screened in the screening process are transported to the crack forming process, and the fine particles screened in the screening process are transported to the water adding process. The raw rice screened in the screening process is processed according to its particle size. Thus, the capacity and capability of the dryer used in the crack forming process can be designed to be smaller, and the heat and energy used in the crack forming process can also be reduced. By providing such a screening process to perform respective processing according to the particle size, the initial cost and running cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a process diagram schematically illustrating a method for producing rice noodles according to an embodiment of the present invention.

[0023] Figure 2 This is a process diagram schematically illustrating a method for producing rice noodles according to another embodiment of the present invention.

[0024] Figure 3 It is used for implementation Figure 1 , Figure 2 A schematic diagram of a manufacturing apparatus for the manufacturing method shown.

[0025] Figure 4 It is a perspective view showing the peripheral surface shape of each roller of a pair of pulverizing rollers.

[0026] Figure 5A This is a schematic diagram showing the state of brown rice, a raw material of the rice flour production method of the present invention.

[0027] Figure 5B This is a schematic diagram showing the state of brown rice, a raw material of the rice flour production method of the present invention.

[0028] Figure 5C This is a schematic diagram showing the state of brown rice, a raw material of the rice flour production method of the present invention.

[0029] Figure 5D This is a schematic diagram showing the state of brown rice, a raw material of the rice flour production method of the present invention.

[0030] Figure 5E This is a schematic diagram showing the state of brown rice, a raw material of the rice flour production method of the present invention.

[0031] Figure 6 This is a graph comparing water absorption characteristics.

[0032] Figure 7 This is a schematic diagram showing a conventional rice noodle production system.

[0033] Fig. 8A This is a schematic diagram showing the state of brown rice, a raw material, in a conventional rice noodle production method.

[0034] Figure 8B This is a schematic diagram showing the state of brown rice, a raw material, in a conventional rice noodle production method.

[0035] Figure 8C This is a schematic diagram showing the state of brown rice, a raw material, in a conventional rice noodle production method.

[0036] Fig.8D This is a schematic diagram showing the state of brown rice, a raw material, in a conventional rice noodle production method.

[0037] Explanation of symbols

[0038] 1: rice noodle manufacturing device, 2: coarse grinding device, 3: heating device, 4: water adding device, 5: slow reviving device, 6: air flow grinding device. DETAILED DESCRIPTION

[0039] Hereinafter, embodiments of the present invention will be described in detail based on the drawings. It should be noted that the following description of the embodiments is merely an illustration in nature.

[0040] Figure 1 1 is a process diagram schematically illustrating a rice noodle manufacturing method according to an embodiment of the present invention. Figure 2 It is a process diagram schematically illustrating a rice noodle manufacturing method according to another embodiment of the present invention. Figure 3 It is used for implementation Figure 1 , Figure 2 A schematic diagram of a production apparatus for the described rice noodle production method.

[0041] like Figure 1 As shown, the rice flour manufacturing method of this embodiment is to use brown rice, polished rice or unwashed rice as raw rice, and grind it into fine powder to manufacture rice flour. Moreover, the rice flour manufacturing method of the present invention adopts the following wet grinding method: it does not need the water washing process and soaking process of the raw rice as in cooking, and grinds it into fine powder after the water absorption into the starch layer is fully carried out.

[0042] That is, in the present invention, there is no need for a washing step or a soaking step in which the raw rice is completely immersed in a container filled with water as in the conventional method. Therefore, there is no need for a drainage treatment facility for drainage generated in the washing step or the soaking step, and the amount of water used when adding water to the raw rice can be greatly reduced.

[0043] exist Figure 1 In the process, first, raw material rice (for example, brown rice with a moisture content of 14%) is supplied to a coarse grinding step ( Figure 1 Step 1, Figure 3 The coarse grinding step is a step of coarsely grinding the raw rice into 2 to 4 pieces to produce coarsely ground raw rice. The coarse grinding device 2 used in the coarse grinding step is, for example, Figure 3 As shown, the machine is configured to include a hopper 21 for feeding raw rice, a winnowing machine 22, a supply trough 23, and a coarse crushing machine 24.

[0044] like Figure 3As shown in FIG. 1 , the coarse pulverizer 24 is formed by a pair of pulverizing rollers 2a and 2b such as a roller mill for milling. The pair of pulverizing rollers 2a and 2b are configured so that the rollers face each other and rotate in different rotation directions (rotation directions inwardly rotating to bite into the raw material rice and coarsely pulverize it) and at different peripheral speeds. In order to coarsely pulverize the raw material brown rice into 2 to 4 petals, as shown in FIG. Figure 4 As shown, the grinding rollers 2a and 2b become brake rollers with roller patterns. That is, a roller pattern consisting of a plurality of grooves is formed on the roller circumference of one grinding roller 2a in parallel with the axial direction of the rotating shaft, and a roller pattern consisting of a plurality of grooves is formed on the roller circumference of the other grinding roller 2b in parallel with the circumferential direction (rotation direction) of the roller, forming a special combination of rollers. As a result, the possibility of the raw rice caught in the roller gap between the pair of grinding rollers 2a and 2b being finely ground (micro-ground) becomes smaller, and the proportion of the raw rice being roughly broken into 2 to 4 petals increases. As shown in FIG. Figure 4 As shown, the special combination of the roller patterns of the pulverizing rollers 2a, 2b is suitable for roughly pulverizing the raw rice.

[0045] In the coarse pulverizer 24 (refer to Figure 3 ) is provided below the pressure feeding ring blower 25. The coarsely crushed raw rice is conveyed upward through the pressure feeding ring blower 25 via the air conveying pipe 26. The raw rice conveyed upward is then captured by the cyclone separator 27 and directly waits.

[0046] Below the cyclone separator 27, a sifter 28 is provided to sieve the coarsely crushed raw rice particles as required (see Figure 3 ) When the number of powdery particles is very small, the sifter 28 does not need to be specially provided.

[0047] exist Figure 1 The coarsely crushed raw rice reaches the crack formation step ( Figure 1 Step 2 Figure 3 3). The cracking step is a step of generating fine cracks in the surface of the raw rice that is coarsely crushed into 2 to 4 pieces, where moisture is difficult to penetrate. The fine cracks serve as channels (conduits) for moisture to reach the starch layer in the center of the raw rice.

[0048] In the crack generation step, a heating device 3 may be used to heat the roughly pulverized raw rice by sending hot air or irradiating microwaves. Figure 3 As shown, the structure includes a winnowing machine 31, a supply tank 32 and a dryer 33.

[0049] like Figure 3As shown, the dryer 33 is composed of the following parts: a grain flow path 34 formed by a porous wall 3a, an inlet 35 at the upper part of the grain flow path 34, an outlet 36 at the lower part of the grain flow path 34, a hot air supply section 37 for conveying air heated to 40 to 60°C in a manner that crosses the grain flow path 34, and an exhaust section 38 for exhausting the hot air that passes through the grain flow path 34 to the outside of the machine, so that it has a form like a one-way grain dryer.

[0050] In the dryer 33, air heated to 40 to 60°C is conveyed to the coarsely ground raw rice for 5 to 10 minutes, and the raw rice is dried using hot air. As a result, a plurality of fine cracks are formed on the surface of the raw rice. At this time, the moisture content of the dried raw rice is about 10 to 13%. In addition, in the case where a microwave heating device 3 is used instead of a dryer 33, when the raw rice is irradiated with microwaves for 1 minute, the raw rice can be rapidly heated to 100°C, and a plurality of fine cracks are formed on the surface of the raw rice. At this time, the moisture content of the entire rice grain is also about 10 to 13%. Turtle shell-shaped or fish scale-shaped fine cracks are generated on the surface of the raw rice, and the cracks become channels (conduits) for moisture to reach the starch layer in the center of the raw rice.

[0051] exist Figure 1 The raw material rice with cracks generated reaches the water adding step ( Figure 1 Step 3 Figure 3 The water adding step is a step of adding water to the raw rice that has been coarsely ground and has fine cracks formed on the surface. In the water adding step, water is supplied through the fracture surface formed in the coarse grinding step and the fine cracks formed in the crack forming step, and is absorbed by the starch layer in the center.

[0052] The water adding device 4 used in the water adding process is, for example, Figure 3 As shown, the structure includes a winnowing machine 41, a water drum 42, a stirring blade 43 rotatably arranged in the water drum 42, a water nozzle 44 arranged in the water drum 42, and a water tank 46 connected from the water nozzle 44 via a pipe 45. A valve 47 is provided in the middle of the pipe 45 to control the flow rate of water.

[0053] The amount of water added is controlled so that the moisture content of the raw rice as a whole becomes 20 to 30%. Specifically, the following method is preferably adopted: fine water droplets are attached to the surface of the raw rice by spraying with the water adding nozzle 44 in the water adding drum 42, and the moisture content is increased by adhering water to the surface of the raw rice. If the water adding nozzle 44 adds water and the stirring blade 43 is stirred for about 10 to 15 minutes, the moisture content of the raw rice as a whole can be controlled to reach 20 to 30%. Through such a water adding process, water can be absorbed into the starch layer in the center through the fracture surface and the fine cracks on the surface of the raw rice. In addition, since the water is added slowly, it has the advantage that it is not easy to produce uneven moisture content between the surface layer and the center of the raw rice.

[0054] exist Figure 1 After the water is added, the raw rice reaches the slow-melting step ( Figure 1 Step 4 Figure 3 The slow thawing process makes the water content of the raw rice uniform. Thus, the water penetrates into the center of the raw rice and makes the water content uniform. If the water content cannot be uniform, the quality of the rice flour in the final fine grinding process will deteriorate. The quality of the rice flour is affected by the presence or absence of the slow thawing process.

[0055] The slow recovery device 5 used in the slow recovery process is, for example, Figure 3 As shown, the structure includes a conveying cylinder 51, a screw 52 rotatably arranged in the conveying cylinder 51, etc. The slow-refreshing device 5 rotates the screw 52 to transfer the raw rice after water addition from the supply port 53 of the conveying cylinder 51 to the discharge port 54. As a result, for the raw rice after water addition, the attached water attached to the surface of the raw rice is absorbed into the starch layer in the center through fine cracks, and the raw rice is tempered to 20 to 30% with no uneven moisture content, preferably about 28%, and is discharged from the discharge port 54.

[0056] exist Figure 1 The slow-melting raw rice reaches the final process, the fine grinding process ( Figure 1 Step 5 Figure 3 The fine grinding process is to finely grind the raw rice after each step of adding water / slowing. At this time, in order to minimize starch damage and produce fine rice noodles, it is preferable to use an air flow grinding device that suppresses the impact during grinding. The air flow grinding device 6 used in the fine grinding process is, for example, Figure 3As shown, the structure includes a fixed pin 62 fixedly arranged in the grinding chamber 61 and a rotating pin 62 rotatably arranged in the grinding chamber 61. The raw rice is put into the grinding chamber 61 of the airflow grinding device 6 and is finely ground by the high-speed rotating rotating pin. At this time, an airflow is generated in the grinding chamber 61, and the airflow is repeatedly impacted by the rotating pin and finely ground, thereby generating rice flour. The finely ground rice flour is dried to a specified moisture content after recovery, and is restored to room temperature in a manner that does not generate condensation, and is shipped to the market as a final product.

[0057] Next, use Figure 5, Figure 6 right Figure 1 The function of the rice flour manufacturing method shown in FIG. Figure 1 In the coarse grinding process of step 1, the raw material rice (for example, brown rice with a moisture content of 14%) is used as the raw material. Figure 5A ) is coarsely crushed into 2 to 4 petals ( Figure 5B ).

[0058] Then, in Figure 1 In the crack generation step of step 2, a plurality of fine cracks K( Figure 5C The fine cracks K serve as channels (conduits) for water to reach the starch layer at the center of the raw rice.

[0059] Furthermore, in Figure 1 In the water adding step of step 3, water is added to the raw rice which is coarsely crushed and has a plurality of fine cracks formed on the surface. Figure 5D At this time, in addition to the fracture surface of the raw rice produced in the coarse grinding process, moisture also penetrates and is absorbed from the fine cracks K produced in the crack generation process. Water is rapidly absorbed into the starch layer in the center through the two moisture channels of the fracture surface and the cracks K.

[0060] Figure 6 This is a graph that confirms the water absorption characteristics (water absorption rate) caused by different processing of raw rice. Figure 6 As shown, it can be seen that the water absorption characteristics of the raw material rice after being coarsely ground and then cracked (solid line = present invention) have a faster water absorption rate and a shorter time to reach saturated water content than the water absorption characteristics of the raw material rice after being coarsely ground (dashed line = prior art).

[0061] And, in Figure 1 In the slow-melting process of step 4, the raw rice is tempered to have no uneven moisture content of 20 to 30%, preferably about 28%. Figure 1 In the fine grinding step of step 5, the raw rice is finely ground to produce rice flour.

[0062] <Other embodiments>

[0063] like Figure 2 As shown, the manufacturing method of rice flour of another embodiment of the present invention is basically the same as Figure 1 The method for producing rice noodles is the same as that of the present invention, but the difference is that a screening step (step A) is provided between the coarse pulverizing step (step 1) and the crack generating step (step 2).

[0064] exist Figure 2 In the screening step (step A), the raw rice particles coarsely crushed in the coarse crushing step are screened. Figure 4 The coarse crusher 24 shown in the figure reduces the possibility of the raw rice being finely crushed (finely crushed), which is suitable for roughly crushing the raw rice, but sometimes finely crushed particles are produced. By providing such a screening process, it is possible to perform respective treatments according to the particle size in the next process of the coarse crushing process.

[0065] exist Figure 2 In the sieving process (step A) shown in FIG. Figure 3 The sifter 28 shown in the symbol 28. The sifter 28 is, for example, Figure 3 As shown in FIG. 2 , the screen 28b is formed by laying a screen 28b in a frame 28a. As the mesh width of the screen 28b, for example, a screen with a mesh of 850 microns can be used. Figure 3 As shown, the frame 28a is provided with a path 28c for transferring the coarsely crushed particles separated by the screen 28b and a path 28d for transferring the fine particles that have passed through the screen 28b.

[0066] Furthermore, the coarsely crushed particles sieved by the screen 28b of the sifter 28 are supplied to the dryer 33 of the crack generation process via the path 28c and the winnowing machine 31, and on the other hand, the fine particles that have passed through the screen 28b of the sifter 28 are supplied to the water adding drum 42 of the water adding process via the path 28d. That is, in another embodiment of the present invention, all the raw materials that are coarsely crushed in the coarse crushing process are not transported to the crack generation process. A part of the fine particles generated during the coarse crushing skips the crack generation process and is directly transported to the water adding process. As a result, the storage capacity and ability of the dryer 33 of the crack generation process can be designed to be smaller, and the heat and energy used by the dryer 33 can also be reduced. By setting up such a screening process, there is an advantage that the initial cost and running cost can be reduced by performing different treatments corresponding to the particle size.

[0067] As described above, in the embodiment of the present invention, as a method for producing rice noodles, there are provided: a coarse grinding step of coarsely grinding raw rice, a cracking step of causing fine cracks to be generated in the water-impermeable layer of the raw rice coarsely ground in the coarse grinding step, a watering step of adding water to the raw rice coarsely ground and having cracks generated in the coarse grinding step and the cracking step, a slow reviving step of causing the water to penetrate the raw rice added with water in the watering step to achieve uniformity of the water content, and a fine grinding step of finely grinding the raw rice whose water content is uniformed in the slow reviving step, so that the washing step and the immersion step of putting the raw rice into a container filled with water and completely immersing it are not adopted as in the past, and therefore, a drainage treatment equipment is not required. In addition, since fine cracks are generated in the water-impermeable layer of the raw rice, the water retention amount of the raw rice as a whole can be increased, and the slow reviving time for the water to penetrate into the whole raw rice can be shortened.

[0068] In addition, a screening process for screening the coarsely ground raw rice is provided between the coarse grinding process and the crack forming process. The coarsely ground particles screened in the screening process are transported to the crack forming process, and the fine particles screened in the screening process are transported to the water adding process. The raw rice screened in the screening process is processed separately according to its particle size. Therefore, it has the advantage of being able to reduce the initial cost and operating cost in the crack forming process.

[0069] In addition, as a coarse grinding device, it is a roller machine in which a pair of grinding rollers are placed opposite to each other and rotate in different rotation directions and at different circumferential speeds, wherein a roller pattern consisting of a plurality of grooves is formed on the roller surface of one grinding roller in parallel with the axial direction of the rotating shaft, and a roller pattern consisting of a plurality of grooves is formed on the roller surface of the other grinding roller in parallel with the circumferential direction of the roller, forming a special roller combination, thereby reducing the possibility of raw rice bitten into the roller gap between the pair of grinding rollers being finely ground (micro-grinding), and increasing the proportion of the raw rice being roughly broken into 2 to 4 petals.

[0070] Furthermore, the heating device is composed of the following parts: a grain flow path formed by a porous wall, an inlet at the upper part of the grain flow path, an outlet at the lower part of the grain flow path, a hot air supply part for conveying heated air in a manner transverse to the grain flow path, and an exhaust part for exhausting the hot air that has passed through the grain flow path to the outside of the machine. Therefore, by drying the moisture content of the entire raw rice to about 10-13%, tortoise shell-shaped or fish scale-shaped fine cracks can be generated on the surface of the raw rice.

[0071] Industrial availability

[0072] The invention can be used for a method and a device for producing rice flour obtained by finely grinding raw rice (brown rice, polished rice, wash-free rice, etc.).

Claims

1. A method for producing rice noodles, characterized in that: have: A coarse crushing step, coarsely crushing the raw rice; a crack generating step of generating fine cracks in the water-impermeable layer of the raw rice coarsely pulverized in the coarse pulverizing step; a water adding step of adding water to the raw rice that has been coarsely ground and cracked in the coarse grinding step and the crack forming step; A slow thawing step is to make the moisture of the raw rice added with water in the water adding step penetrate to achieve uniform moisture content; as well as The fine pulverizing step is to finely pulverize the raw rice whose moisture content has been uniformed in the slow thawing step.

2. The method for producing rice flour according to claim 1, wherein Between the coarse grinding process and the crack forming process, a screening process is provided for screening the coarsely ground raw rice. The coarsely ground particles screened in the screening process are transported to the crack forming process, and the fine particles screened in the screening process are transported to the water adding process. The raw rice is processed separately according to the particle size of the screened raw rice in the screening process.

3. A rice noodle manufacturing device, characterized in that: have: A coarse grinding device for coarsely grinding the raw rice; a heating device for causing fine cracks to form on the surface of the raw rice coarsely ground by the coarse grinding device; a water adding device for adding water to the raw rice that has been coarsely pulverized by the coarse pulverizing device and on which fine cracks have been generated by the heating device; A slow-recovery device, which makes the moisture of the raw rice added with water by the water adding device uniform; as well as The air flow pulverizing device finely pulverizes the raw rice that has been slowly softened by the slow softening device.

4. The rice noodle manufacturing device according to claim 3, wherein a sifter is provided between the coarse pulverizing device and the heating device to sieve the raw rice coarsely pulverized by the coarse pulverizing device into coarsely pulverized particles and fine particles.

5. The rice noodle manufacturing device according to claim 3 or 4, characterized in that: The coarse crushing device is a roller machine that places a pair of crushing rollers opposite to each other and rotates in different rotation directions and at different circumferential speeds. A roller pattern consisting of multiple grooves is formed on the roller surface of one crushing roller in parallel to the axial direction of the rotating shaft, and a roller pattern consisting of multiple grooves is formed on the roller surface of the other crushing roller in parallel to the circumferential direction of the roller, forming a special roller combination.

6. The rice noodle manufacturing device according to claim 3 or 4, wherein the heating device is composed of the following parts: a grain flow path formed by a porous wall, an inlet at the upper part of the grain flow path, an outlet at the lower part of the grain flow path, a hot air supply part for conveying heated air in a manner transverse to the grain flow path, and an exhaust part for discharging the hot air passing through the grain flow path to the outside of the machine.

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