JPH04320656A - Wash-free rice, processing of wash-free rice and apparatus therefor - Google Patents

Abstract

PURPOSE:To obtain wash-free rice free from breakage and cracking and cookable simply by adding water without necessitating the washing and immersion procedures prior to cooking by forcedly dehydrating washed rice and drying to a prescribed water-content. CONSTITUTION:The objective wash-free rice can be produced by forcedly dehydrating washed rice and drying the dehydrated rice to a water-content of e.g. <=16%.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to so-called wash-free rice that can be cooked by immediately adding water without the need for rice washing (rice polishing) or soaking prior to cooking, and further relates to this wash-free rice. The present invention relates to a processing method and an apparatus for the same.

0002

BACKGROUND OF THE INVENTION Although most of the bran from white rice polished by a rice milling machine has been removed during the polishing process, a considerable amount of fine bran still remains attached to the white rice. If you cooked the rice as it was, it would end up with a rice bran smell, so it was necessary to wash the white rice before cooking. Also, if the rice is not sufficiently soaked before cooking, the rice will be grainy, so it is essential to soak the rice after washing it.

0003

[Problems to be Solved by the Invention] Since washing and soaking the rice requires time and effort, various proposals have been made for washing-free rice. For example, in JP-A-2-242647 ``Dry Washed Rice, Method for Producing the Same, and Packaging Method for Dry Washed Rice,'' there is a detailed description of dry washed rice obtained by washing polished rice with water and removing water. However, even if washed white rice is treated to remove water, cracks in the body and minute cracks on the surface cannot be avoided. In other words, water removal or dehydration is the process of removing moisture such as water droplets that adhere to the surface of rice grains while still in a liquid state.Usually, washing rice increases the water content by about 2%, so washing rice Immediately after, this 2% increase in moisture is present mainly in the surface layer of the rice grain, and as time passes, this moisture migrates to the center, causing distortion of the rice grain structure and cracking of the rice grain. Rice grains with cracked shells are easily broken into pieces by the slightest impact during the distribution process, and minute cracks on the surface cause the rice grains to become cloudy, making them worthless as a product.

[0004] In view of these problems, the technical object of the present invention is to provide wash-free rice, a process for processing wash-free rice, and an apparatus therefor, which do not cause shell cracks or cracks.

[0005]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention is to obtain unwashed rice by washing and forcibly dehydrating the rice and then drying it to a predetermined moisture content.

[0006] In addition, the apparatus for obtaining the above-mentioned unwashed rice is a rice washing/dehydration apparatus in which a screw for transporting rice grains is installed in a rotary cylinder whose terminal end is a draining part with a porous wall. It is preferable to provide a drying device in the subsequent process to dry the washed and dehydrated rice grains to a predetermined moisture content.

[0007] Furthermore, the moisture content of the unwashed rice obtained in this way is the upper limit specified by the Agricultural Products Standard Regulations.
% or less.

[0008]

[Function] The white rice and water supplied into the rotating cylinder are washed while being stirred and transferred by a screw installed in the rotating cylinder, and the water is forced to wash in the drainage part formed at the end of the rotating cylinder. The water that adheres to the surface of the rice grains is removed by dehydration. The white rice, from which water has been removed while still in a liquid state, is then washed and dehydrated by the rice washing and dehydration equipment.
In a drying device disposed after the dehydration device, part of the moisture that permeated the surface layer of polished rice during washing is vaporized and dried to a predetermined moisture content.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the drawings. Figure 1 is a schematic diagram of the no-rinse rice processing equipment, Figure 2
The figure is a front view, and FIG. 3 is a sectional view of the rice washing/dehydrating apparatus.

The no-rinse rice processing device 1 consists of a rice washing/dehydrating device 2 and a drying device 3. A supply hopper 4 is provided above the rice washing/dehydrating device 2, and the supply hopper 4 is connected to a rice polishing machine (not shown) or the like. be done. A rotary valve 5 provided below the supply hopper 4 is connected to a supply port 7 via a supply tube 6, and the supply tube 6 is connected to a water tank (not shown) etc. via a flow meter 8 and a solenoid valve 9. is in contact with.

A motor 11 is attached to one side wall of a pedestal 10 of the rice washing/dewatering apparatus 2, and a motor pulley 12 which is attached to the shaft of the motor 11 is connected to a pulley 15 which is attached to a main shaft 14 via a belt 13 and a tension pulley 19. Link. The other motor pulley 16 is connected to a pulley 73 of a hollow rotating shaft 18 via a belt 17. The main shaft 14 is connected to a rotating cylinder 21 via a connecting shaft 20, and a connecting plate 22 attached to the rotating cylinder 21 is connected to a rice washing cylinder 23. Rice washing cylinder 23 and rotating cylinder 2
1 is used as a rice washing chamber 24, a spiral blade 25 for lifting is attached to the outer periphery of the rice washing cylinder 23, and a dehydration chamber 27 is formed by the rice washing cylinder 23 and a porous wall cylinder 26 surrounding the spiral blade 25. The porous wall cylinder 26 is connected to the rotating shaft 18 via a rotating table 28, and the upper end of the spiral blade 25 communicates with a discharge gutter 30 via a discharge port 29. Reference numeral 31 is a drain port for collecting and discharging dehydrated water, and the drain port 31 is connected to a pump 34 via a drain pipe 32 and a solenoid valve 33. A discharge tube 35 connected to the discharge gutter 30 is provided with an air shutter 36, and the lower part of the discharge gutter 35 is formed with a porous wall to allow water droplets to fall.

The discharge tube 35 of the rice washing/dewatering device 2 is connected via a rotary valve 37 to a screw conveyor 39 connected to a motor 38. This screw conveyor 3
9 communicates with a supply port 41 opened at the lower end of the cylinder 40;
A screw conveyor 43 rotated by a motor 42 is installed inside the cylinder 40, and a discharge port 44 is provided at the upper end of the cylinder 40.
Open. A supply cylinder 45 provided on the supply screw conveyor 39 is connected to the outside air via a heater 46 and a filter 47, and 48 is an exhaust device that sucks and discharges dry air. A discharge tube 49 connected to the discharge port 44 of the cylinder 40
A rotary valve 50 is attached to the lower end of the rotary valve 50, and the rotary valve 50 communicates with a grain lifting machine 52 via a discharge tube 51. The solenoid valves 53 of the rice washing/dehydrating device 2 and the drying device 3 supply and stop air to prevent the adhesion of rice bran, etc., and the valve 54 discharges the remaining polished rice when the dryer 3 finishes drying. It is an air shutter.

Next, the operation of the above configuration will be explained. The polished rice polished by the rice milling machine is supplied to the rice washing chamber 24 via a supply hopper 4, a rotary valve 5, a supply cylinder 6 and a supply port 7. Water for washing rice is supplied from the flow meter 8 to the rice washing chamber 24 via the supply cylinder 6 and the supply port 7 by opening the solenoid valve 9. The rice washing cylinder 23 is activated by starting the motor 11.
rotates at approximately 1,500 to 2,000 revolutions per minute, and as a result of this rotation, the polished rice supplied to the rice washing chamber 24 is subjected to a washing action. Due to the rice washing action, the bran layer remaining in the polished rice is separated and eluted, and the washed polished rice is transported through the dehydration chamber 27 by the spiral blades 25. At this time, the dehydration action is forcibly performed by the porous wall cylinder 26 which rotates about 100 rotations slower than the rice washing cylinder 23, and the water containing the bran eluted from the polished rice is blown out through the holes of the porous wall cylinder 26 and discharged. . The discharged polluted water is collected in the drain port 31, flows down the drain pipe 32, and is discharged outside the machine by opening the solenoid valve 33 and operating the pump 34.

The dehydrated polished rice is pumped to the spiral blades 25 and discharged from the discharge port 29, flows down the discharge tube 35 from the discharge gutter 30, and is sent to the rotary valve 37 of the drying device 3. When flowing down the discharge pipe 35, water droplets remaining on the polished rice fall from the porous wall at the bottom and are discharged outside the machine by the pump 34.

The polished rice discharged by the rotary valve 37 is sent to the supply port 41 by the screw conveyor 39, and at this time, dry air heated by the heater 46 is supplied from the supply cylinder 45 to the polished rice. As this drying air rises inside the cylinder 40, it dries the polished rice that is being stirred and pumped inside the cylinder 40, and is discharged from the machine through the air exhaust device 48. The dried polished rice is discharged from the discharge port 44, flows down the discharge tube 49, is discharged by the rotary valve 50, and is sent from the discharge tube 51 to the grain lifting machine 52 to the next process. The condensation phenomenon that tends to occur when polished rice flows down the discharge pipe 51 is prevented by supplying cold air from the fan 55. After drying, the white rice remaining at the bottom of the cylinder 40 is removed by the air shutter 5.
4, the grains are discharged and sent to the grain lifting machine 52. When cleaning the rice washing/dehydrating device 2 after washing rice,
This is done by closing the air shutter 36 and supplying water.

[0016] The time required for washing and dehydrating rice in the rice washing/dehydrating device 2 is 5 to 45 seconds, and the water content of polished rice is reduced to 1.5 seconds.
In addition, the required drying time in the drying device 3 is 20 to 120 seconds, and the moisture content of polished rice is reduced to 0.5%.
The final moisture content is adjusted to a range of 15 to 16%, which is considered to have good taste, and processed into wash-free rice. This wash-free rice does not require washing, so the water used for cooking the rice does not get dirty.Also, since a certain amount of water permeates into the inner layer of the rice grain, the rice grains do not become hard due to lack of water, and the taste is good. It makes a good meal.

FIG. 4 shows a second embodiment of the present invention, in which a milled rice supply hopper 56 is connected to a mixing tank 58 via a rotary valve 57, and a water supply device (not shown) is connected to a solenoid valve 59. The mixing tank 58 is connected via the mixing tank 58. The mixing tank 58 is connected to the rice washing/dehydrating device 2 and the drying device 3 via a pump 60. To describe its function, the supply hopper 56
The polished rice is discharged by a rotary valve 57 and mixed with water supplied to a mixing tank 58. Preliminary washing of the rice is performed by passing the polished rice and water through the pump 60. The pre-washed white rice is sent to a rice washing/dehydrating device 2, where the rice is mildly washed, then forcibly dehydrated, and then dried in a drying device 3.

FIG. 5 shows a third embodiment, in which a discharge tube 35 of the rice washing device 2 is connected to a supply tube 63 of a horizontal drying device 62 via a rotary valve 61. The horizontal drying device 62 is provided with a rotary porous wall cylinder 65 in a casing 64, and the rotary perforated wall cylinder 65 is horizontally suspended with its discharge side slightly lower. The outside air is connected to the supply cylinder 69 via a filter 66, a fan 67, and a heater 68, and an exhaust pipe 70 is connected to the upper part of the casing 64.
A discharge tube 71 is provided at the bottom of each of the discharge tubes 71, and a rotary valve 72 is attached to the discharge tube 71. To describe its function, the polished rice washed by the rice washing/dewatering device 2 flows down the discharge tube 35, is discharged by the rotary valve 61, and is fed into the rotary porous wall tube 65 from the supply tube 63. When the white rice is stirred and flowed through the porous wall rotary cylinder 65, it is dried by the drying air supplied from the supply cylinder 69.
is exhausted outside the aircraft.

FIG. 6 shows a fourth embodiment, in which the drying device of the no-rinse rice processing device shown in FIG. 4 is replaced with the horizontal drying device 62 shown in FIG. 5, and the operation is the same, so the explanation is omitted. do.

Next, a fifth embodiment will be explained based on FIG. 7, which shows another embodiment of the rice washing/dehydrating apparatus. In a cylindrical machine frame 101 provided with a supply gutter 102 at one end and a discharge gutter 103 at the other end, an inner cylinder 106 is rotatably installed horizontally via a pair of bearings 104 and 105. An opening at one end of the inner cylinder 106 communicates with a rice feeding path 108 formed by a supply gutter 102 and an inclined feeding chute 107 connected thereto, and an opening at the other end communicates with a rice feeding path 108 formed by a discharging gutter 103. Road 1
10, and the rice feeding path 108 faces a discharge port of a water pipe 109 equipped with a flow rate adjusting means (not shown). Further, the terminal end side of the inner cylinder 6 is formed with a porous wall 111 to form a draining part 112, and the other part of the inside of the inner cylinder 106 forms a dipping part 113. The partition wall 11 surrounds the draining part 112.
4 constitutes a drainage chamber 115, and a drainage gutter 117 is provided below the drainage port 116 at the lower end of the drainage chamber 115.

Furthermore, a screw 119 having screw blades 118 made of resin is installed horizontally over the entire length inside the inner cylinder 6. That is, a screw shaft 122 is rotatably supported by bearings 120 and bushes 121 at both ends of the machine frame 101,
A driven pulley 123 is attached to the end of the screw shaft 122 on the rice feeding path 108 side. On the other hand, a passive pulley 124 is formed on the outer peripheral wall of the inner cylinder 106, and these passive pulleys 123, 12
4 and a pair of motor pulleys 126 and 127 that are pivotally attached to both shaft ends of a motor 125 are interlocked and connected by V belts 128 and 129. The passive pulleys 123 and 124 are
The driven pulley 123 of the screw 119 is formed to have a smaller diameter than the driven pulley 124 of the inner cylinder 106 so that the screw 119 rotates at a higher speed than the inner cylinder 106. In addition, the gap between the screw blade 118 and the inner cylinder 106 is approximately 0.3 mm, and the draining portion 11
Needless to say, the porous wall 111 of No. 2 is formed to prevent rice grains from leaking out.

[0022] In addition, drain holes 1 are provided at the bottom of the machine frame 101 as appropriate.
It is recommended to drill 30.

Next, the specific operation of the above embodiment will be explained. When the motor 125 is started, the screw 119 and the inner cylinder 6 simultaneously start rotating in the same direction. The rotational speed is, for example, 1600 rotations per minute for the inner cylinder 6 and 1720 rotations per minute for the screw 119. Polished rice fed from a hopper (not shown) flows down into the supply gutter 102, and water is supplied from a water pipe 109. The amount of water supplied is 1.5 times the amount of milled rice supplied. For example, if the flow rate of polished rice is 200 kg/hour, the flow rate of water is 300 kg/hour.
It is a kilogram.

When the apparatus starts operating under these conditions, the polished rice falling in the supply gutter 102 comes into contact with water while flowing down the supply chute 107, and continues to flow into the inner cylinder 1.
06 into the immersion section 113. The inner cylinder 106 is 1 minute per minute.
Since the rotation is 600 times, the polished rice and water spread along the inner circumferential wall of the inner cylinder 106 due to centrifugal force, and the cross section becomes almost annular. On the other hand, the screw 119 has a speed of 172 per minute.
Since the rotation is 0, the screw 119 transfers the polished rice and water at 120 rotations per minute. Therefore, the polished rice immersed in water passes through the immersion section 113 in about 4 to 5 seconds, and during this time, the bran pieces adhering to the surface of the polished rice absorb water and become soft. Therefore, the immersion section 113
In this case, it is sufficient that there is enough time for the bran pieces to soften, and by changing the number of rotations of the screw 119, the time for passing through the immersion section 113 is set as appropriate.

The polished rice and water that have passed through the soaking section 113 are
Next, water is blown away from the porous wall 111 while passing through the draining section 112 for 1 to 2 seconds, and together with this water, softened bran pieces and the like on the surface of the rice grains are easily peeled off and forcibly blown away. In this way, the polished rice from which all the bran particles and the like have been removed and drained, that is, the washed polished rice, is sent to the discharge gutter 10.
On the other hand, the polluted water mixed with bran particles is blown into the drainage chamber 115 and then discharged through the drainage gutter 117.

If the screw 119 is provided with a stirring protrusion and the rice grains are transferred while being stirred, the rice can be washed more effectively.

[0027]

[Effects of the Invention] As described above, according to the present invention, after washing the rice, water adhering to the surface of the rice grains is forcibly removed, and a portion of the water that has penetrated into the surface layer of the rice grains is further removed by vaporization. ,
In other words, since the rice is dried, the rice grains do not crack or crack due to rapid water absorption during washing, making them suitable for distribution.
Moreover, it is possible to provide wash-free rice to which water has been appropriately added within the legal moisture limit.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a first embodiment of a wash-free rice processing device.

FIG. 2 is a front view of the same as above.

FIG. 3 is a cross-sectional view of the rice washing/dehydration device.

FIG. 4 is a schematic diagram of a second embodiment of the wash-free rice processing device.

FIG. 5 is a schematic diagram of the third embodiment.

FIG. 6 is a schematic diagram of the fourth embodiment.

FIG. 7 is a sectional view showing another embodiment of the rice washing/dehydrating device.

[Explanation of symbols]

1. Rinse-free rice processing equipment 2　Rice washing/dehydration equipment 3 Drying equipment 4 Supply hopper 5 Rotary valve 6 Supply cylinder 7 Supply port 8 Flow meter 9 Solenoid valve 10 Mount 11 Motor 12 Motor pulley 13 Belt 14 Main shaft 15 Pulley 16 Motor pulley 17 Belt 18 Rotation axis 19 Tension pulley 20 Connecting shaft 21 Rotating tube 22 Connecting plate 23　Rice washing cylinder 24　Rice washing room 25 Spiral wing 26 Porous wall tube 27 Dehydration room 28 Turntable 29 Discharge port 30 Discharge gutter 31 Drain port 32 Drain pipe 33 Solenoid valve 34 Discharge pipe 35 Ejection pipe 36 Air shutter 37 Rotary valve 38 Motor 39 Screw conveyor 40 Cylinder 41 Supply port 42 Motor 43 Screw conveyor 44 Discharge port 45 Supply cylinder 46 Heater 47 Filter 48　Air exhaust device 49 Discharge pipe 50 Rotary valve 51 Discharge pipe 52 Grain lifting machine 53 Solenoid valve 54 Air shutter 55 fan 56 Supply hopper 57 Rotary valve 58 Mixing tank 59 Solenoid valve 60 Pump 61 Rotary valve 62 Horizontal drying equipment 63 Supply cylinder 64 Casing 65 Porous wall rotating tube 66 Filter 67 fan 68 Heater 69 Supply cylinder 70 Exhaust pipe 71 Ejection pipe 72 Rotary valve 73 Pulley 101 Machine frame 102 Supply gutter 103 Discharge gutter 104,105 Bearing 106 Inner cylinder 107 Supply chute 108 Rice supply route 109 Water pipe 110　Rice drainage route 111 Porous wall 112 Draining section 113 Immersion section 114 Partition wall 115 Drainage room 116 Drain port 117 Drainage gutter 118 Screw blade 119 screw 120 Bearing 121 Bush 122 Screw shaft 123, 124 Passive pulley 125 Motor 126, 127 Motor pulley 128,129 V-belt 130 Water drain hole

Claims (4)

[Claims] 1. Wash-free rice obtained by washing the rice, forcibly dehydrating it, and then drying it to a predetermined moisture content. 2. A method for processing rice without washing, which comprises washing and forcibly dehydrating the rice, and then drying the rice to a predetermined moisture content. [Claim 3] A rotary cylinder is provided in communication with the rice feeding path for supplying rice and water, the terminal end of the cylinder is used as a drainage part of the porous wall, and the rice grains in the cylinder are conveyed to the cylinder. A no-wash rice processing device, characterized in that a drying device for drying the rice grains that have passed through the rice washing and dehydration device to a predetermined moisture content is disposed in a downstream process of the rice washing and dehydration device which includes a screw. 4. The wash-free rice, wash-free rice processing method, or wash-free rice processing apparatus according to claim 1, claim 2, or claim 3, wherein the moisture content after drying is 16% or less.