JPH1142056A - Production or rice unneeded washing and machine therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce polished rice that does not need to be washed with water, as rice bran can be removed from the polished rice and, in addition, the aleuron layer is also removed, by adding a specific amount of water to polished rice grains and polishing them by agitation at a certain additional level. SOLUTION: In the production of polished rice grains in no need of washing before boiling by stirring polished rice grains together with water. separating into the polished rice grains and water and adjusting the rice grains in its moisture content, water is added to the polished rice grains in an amount of 10-30 wt.% based on the grains and the polished rice grains are further polished by stirring by 0.5-2.0 wt.%. In a preferred embodiment, the operations from the addition of water to the polished rice grains to the separation of water from the rice grains are performed within 1 minutes. The moisture content of the treated rice grains is preferably adjusted by flowing warm air. The treated rice grains may be dried with warm air followed by the moisture control with air at room temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing polished rice that can be cooked without washing, that is, so-called non-washed rice.

[0002]

2. Description of the Related Art There is an application relating to the production of polished rice which can be cooked without washing by adding water to polished rice by removing water from the polished rice, that is, so-called non-washed rice. When the rice was once peeled off from the rice grains, it was washed off with a large amount of water (about 0.5 to 5 water per 1 polished rice), so-called rice washing. is there.

[0003] Normally, a number of aleurone layers which have not been removed by milling remain on the surface of the polished rice, together with the above-mentioned adhered bran on the surface. The attached rice bran can be almost completely removed from the polished rice by the above-mentioned rice washing, but the aleurone layer which forms a part of the polished rice itself cannot be removed by the rice washing. The production of non-washed rice by washing rice is not intended to actively remove even the extra bran that forms a part of the surface from the polished rice, but by washing away only the adhered bran from the polished rice, It simply lowers the water turbidity of washed rice (water turbidity when polished rice is washed with water) to the same degree as polished rice by hand washing. Therefore, when non-washed rice obtained by such washing of rice is cooked, there is a case where the rice has a bran smell or a reduced taste due to the residual aleurone layer. To avoid this, milling must be further advanced to lower the yield of milled rice.

[0004] In the production of non-washed rice by washing rice, a large amount of water is added to the polished rice to generate a large amount of wastewater. For this reason, a large-sized wastewater treatment apparatus is required, and the size of the rice-free rice production facility is increased. Although it is possible to reduce the size of wastewater treatment equipment to some extent by improving wastewater treatment capacity, there is a limit to wastewater treatment capacity, and further downsizing of equipment is not possible unless the amount of water used is significantly reduced. I can't hope.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention can remove the adhered bran from the polished rice, and can also remove the aleurone layer, which is the bran content of the polished rice itself. Another object of the present invention is to provide a method and an apparatus for producing unwashed rice that can reduce the size of the entire unwashed rice production facility by significantly reducing the size of the wastewater treatment apparatus.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, a method for producing rice without washing according to the present invention comprises the steps of: adding water to polished rice, stirring the polished rice, separating the polished rice and the water, In the non-washed rice production method of refining the refined rice,
Water of 10 to 30% (by weight) is added to the polished rice, and the polished rice is added to the polished rice by 0.5 to 2.
The technical means of milling 0% was taken.

The processing from the addition of water to the polished rice to the separation of the water from the polished rice is performed within one minute.

[0008] The refining process is performed by ventilation.

[0009] The ventilation is performed with warm air.

After passing the polished rice with warm air, the polished rice is ventilated at room temperature for conditioning.

The water separated from the polished rice is heated and evaporated, and the bran of the polished rice contained in the water is dried.

Further, the rice-free rice producing apparatus according to the present invention is provided with a rice feed section for polished rice at one end and a rice discharge section at each end to form a communication passage for the polished rice, and the rice discharge section side of the communication path. While forming the centrifugal dewatering unit, while forming the communication path between the rice feeding unit and the centrifugal dewatering unit in the milling unit, a milling device connected to the milling unit with water addition means, the milling device And a refining device for refining the polished rice discharged from the milling device.

The milling unit is formed of a screw for feeding the milled rice to the centrifugal dewatering unit side, and a reverse screw provided on the same axis as the screw and on the centrifugal dewatering unit side.

The milling section and the centrifugal dewatering section are formed on different axes, and different rotating shafts are respectively provided therein.
A screw is provided on the centrifugal dewatering unit side of the reverse feed screw to forcibly transport milled rice to the centrifugal dewatering unit.

[0015] The refining device comprises a net for conveying the polished rice from the milling device and a ventilation device for ventilating the net.

The ventilation device is provided with a heating device for heating the ventilation air.

In a subsequent step of the conditioning apparatus, a second conditioning apparatus is provided for passing the normal-temperature air to the polished rice from the conditioning apparatus.

A drying device for heating water from the centrifugal dewatering unit, evaporating the water and drying the bran of the polished rice is connected to the centrifugal dewatering unit.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an apparatus for producing non-washed rice. A non-washed rice producing apparatus 1 comprises a milling device 2 for mixing and stirring polished rice with water and crushing, and a polished rice from the milling device 2. And a second refining device 4 for refining the polished rice from the first refining device 3.

FIG. 2 is a vertical sectional view of the milling apparatus 2. The milling apparatus 2 will be described below. The milling device 2 comprises a milling unit 23 and a centrifugal dewatering unit 24.
Reference numeral 3 denotes an erecting cylinder 6 having a lower end formed at a discharge port 5, and a rice feed gutter 9 and a supply hopper 10 are connected to a supply port 7 provided at an upper portion of the milling cylinder 6 via a conveying screw 8. .
In the milling cylinder 6, a milling shaft 12 having an inner cavity 17 rotatably supported by a bearing portion 11 provided at one end and having a bore 17 is provided.
3. A reverse screw 14 and a discharge screw 15 are axially mounted, and a stirring blade 16 is axially mounted between the supply screw 13 and the reverse screw 14. In addition, a plurality of holes 21 are drilled in the milling shaft 12, and
A water supply device 18 for supplying water to the lumen 17 is connected to the upper end of the water supply device 18. Reference numeral 19 denotes a pulley mounted on the upper part of the milling shaft 12, which is connected to a motor 20 via a V-belt so that the milling shaft 12 is rotatable. Also,
Reference numeral 22 denotes a drive motor for driving the transport screw 8.

The centrifugal dewatering unit 24 has a frame 28 in which a dewatering cylinder 27 is rotatably provided by bearings 26, 26, and the upper portion of the frame 28 communicates with the polishing unit 23 via a horizontal conveying screw 25. The supply cylinder 29 is connected to a rice discharging gutter 30 at the lower part. Then, the dewatering shaft 3, which spans the supply cylinder 29 and the rice discharge gutter 30, is provided with a dewatering screw 34.
1 is erected, and both ends of the dehydrating shaft 31 are rotatably supported by bearings 32 and 33. The drainage gutter 30 of the dewatering cylinder 27
Side is formed in the porous wall 35 for dehydration, and the porous wall 35
Is formed in a dehydration chamber 36, and a drainage cylinder 38 connected to a suction device (not shown) and a suction cylinder 37 are formed in the dehydration chamber 36.
Are provided. A pulley groove 39 formed on the peripheral surface of the dewatering cylinder 27 and a pulley 40 mounted on the upper end of the dewatering shaft 31 are connected to a motor 42 via a V-belt. Reference numeral 43 denotes a motor for driving the horizontal conveyance screw 25, and reference numeral 44 denotes a case where water is accumulated in the dehydration chamber 36.
A drain port for discharging water to the outside of the apparatus. Reference numeral 41 denotes a discharge disk for discharging the polished rice to the rice discharge gutter 30.

The drainage cylinder 38 is connected to a drying device 65 via a suction device.
6, a hollow disk 67 rotatably provided inside
And a nozzle 68 for spraying the drainage from the milling device 2 onto the surface of the disk 67, a scraper 69 provided in close contact with the surface of the disk 67, and a solid removed from the surface of the disk 67 by the scraper 69. And a discharge gutter 70 for discharging. Further, high-temperature steam or the like is supplied into the disk 67, and the surface of the disk 67 is always maintained at a temperature at which moisture evaporates.

Next, the first heat treatment device 3 is shown in FIGS.
This will be described with reference to FIG. 4 is a top view of the first heat treatment device 3, and FIG. 3 is a sectional view.

The first refining device 3 includes a rotating body 47 having a net 46 stretched over a support frame 45 rotatably provided by a motor 56, and a supply tube 48 communicating with the rice discharge gutter 30 of the milling device 2. And a rice discharging gutter 49, and the periphery of the rotating body 47 is surrounded by an upper cover 50 and a lower cover 51. Then, a space between the rotating body 47 and the upper cover 50 is formed in the conditioning chamber 52, a space between the rotating body 47 and the lower cover 51 is formed in the exhaust chamber 53, and the air conditioning duct 52 is provided in the conditioning chamber 52. And an exhaust duct 55 connected to a suction blower (not shown) is connected to the exhaust chamber 53. Further, a guide plate 64 is provided which is connected to one side of the rice discharging gutter 49 and guides the milled rice from the supply tube 48 to the rice discharging gutter 49. Further, the air supply duct 54 may be provided with a heater and a blower for heating the air supplied to the first heat treatment device 3.

The second refining device 4 has a supply port 57 communicating with the rice discharge gutter 49 of the first refining device 3 at one end and a machine frame 59 having a discharge port 58 at the other end. A perforated bed 60 is provided internally. The machine frame 59 is provided with a vibration motor 61 and supported by a joint 62 so as to be able to vibrate. An exhaust duct 63 for connecting to a suction blower (not shown) is provided in the upper part of the machine frame 59, and an air supply port is opened in the lower part of the machine frame 59. The vibration direction of the vibration motor 61 is a direction in which the milled rice on the perforated bed 60 is moved from the supply port 57 side to the discharge port 58 side.

The operation of the above configuration will be described.

The milled rice in the supply hopper 10 of the milling device 2 is supplied with water from the water supply device 18 immediately after being supplied to the milling section 23 from the supply port 7 by the transport screw 8.
Through the hole 21. The amount of water added at this time is 10 to 30% (by weight), preferably 15% (by weight) based on the milled rice. The milled rice to which water has been added is transferred downward by the supply screw 13 and
6 and flow down to the reverse screw 14;
The polished rice is stirred and milled while being subjected to the upward returning force by the reverse feed screw 14. During this time, the adhered bran of the polished rice moves into the water, and the aleurone layer that has been milled and separated from the polished rice moves into the water. The milling of the polished rice proceeds mainly by the reverse feed screw 14, and the milling accuracy at this time is 0.5 to 2.0% with respect to the polished rice. The polished rice that has flowed down from the reverse screw 14 is immediately supplied to the centrifugal dewatering unit 24 by the discharge screw 15 and the horizontal transport screw 25 without stagnation.

In the centrifugal dewatering section 24, the polished rice and water are transferred downward by the dewatering screw 34,
In 5, the centrifugal action of the rotation of the dewatering cylinder 27 and the suction of the wind from the suction cylinder 37 to the exhaust air cylinder 38 by the suction device separate the milled rice from the water containing the attached bran and the aleurone layer. You. Then, the polished rice is centrifugally dehydrated 24
Is supplied from the rice discharge gutter 30 to the first heat treatment device 3 by a discharge disk 41 provided at the lower portion of the, and water is supplied to the drying device 65 via the dewatering chamber 36 and the air discharge tube 38.

The water containing bran supplied to the drying device 65 is sprayed onto the surface of the disk 67 by a nozzle 68,
The water evaporates due to the heat from the disk 67 while the disk 68 rotates, and the bran adheres to the surface of the disk 68.
Then, the bran adhering to the surface of the disk 68 is peeled off from the surface of the disk 68 by the scraper 69 and is discharged from the discharge gutter 70 as a solid material outside the machine. Drying device 65
The amount of water added to the polished rice can be sufficiently evaporated by the disk 68 since the amount of water added to the polished rice is as small as 5 to 30% by weight based on the polished rice.

The milling accuracy of the polished rice is as follows.
Can be changed by adjusting the rotation speed of the rice, the supply amount of the milled rice, and the amount of water added.
By adjusting the rotation speed of the rice, the degree of dewatering of the polished rice can be adjusted.
, Stable rotation can be obtained even when rotated at high speed.

The time from the addition of water to the polished rice to the separation and dehydration of the polished rice and water is such that the water does not penetrate deep into the polished rice, for example, within 1 minute, preferably 5 minutes.
Within seconds is good.

From the supply tube 48 of the first heat treatment device 3 to the heat treatment room 5
The milled rice supplied on the net 46 in the second 2 flows into the conditioning room 52 from the air supply duct 54 by the operation of the suction blower, and is sucked through the net 46, the exhaust air chamber 53 and the exhaust air duct 55. While being refined by the ventilation action of the wind sucked into the rice, it is transferred to the rice discharging port 49 by the rotation of the rotating body 47 and guided to the rice discharging port 49 by the guide plate 64, and the rice discharging port 4
9 to the second refining device 4. Further, when a blower is connected to the air supply duct 54, the ventilation function is improved,
Further, when a heater is provided between the air supply duct 54 and the air blower, the milled rice can be dried in a short time. The time required for one rotation of the rotating body 47 is 4
-12 seconds, preferably 6-8 seconds. The quality of the refined rice can be adjusted by adjusting the number of rotations, the amount of ventilation, and the temperature of the rotating body 47.

The porous bed 6 is supplied from the supply port 57 of the second heat treatment device 4.
The milled rice supplied to 0 is transferred from the supply port 57 side to the discharge port 58 side by the vibration of the vibration motor 61. During the transfer, the polished rice is conditioned by the ventilation action of the normal temperature air by the suction blower, the moisture and the polished rice temperature are adjusted, and the polished rice is discharged from the discharge port 58 to the outside of the machine. Further, when there are crushed grains in the polished rice, the crushed grains fall from the holes of the porous bed 60 and are separated from the polished rice.

[0034]

[Embodiment] The above-mentioned apparatus 1 for producing rice without washing has a yield of 90%.
%, Water content of 14.5%, and water washing turbidity of 110 ppm, Koshihikari produced in Shimane Prefecture were milled and refined to produce unwashed rice. At the same time, the relationship between the water content and the water turbidity of the washed rice was investigated (FIG. 5).

The milled rice 2 is supplied with 1000 kg of the above polished rice per hour and the amount of water added is adjusted to 15% by weight of the polished rice.
The time from the supply of the milled rice to the milling device 2 to the discharge of the milled rice from the rice discharge gutter 30 is about 3 seconds, and the time of one rotation of the rotating body 47 of the first conditioning device 3 is 8 seconds. The time from the supply of the polished rice to the second refining device 4 to the discharge from the discharge port 58 was set to 5 seconds.

The obtained polished rice is 988 kg, the yield is 88.9% (based on brown rice), the moisture is 14.5%,
The water turbidity of the washed rice was 55 ppm, and the polished rice as the raw material was ground at about 1.2% by weight.

Further, as a result of cooking the obtained non-washed rice, there was no burning or bran odor and the taste was good.

As is clear from FIG. 5, the water content is 10%.
When it is less than (weight), the water turbidity of rice washing is high and 10%
(Weight) or more, the turbidity is stabilized at 50 to 60 ppm. On the other hand, when the amount of water exceeds 30% (weight), the so-called underwater milling is performed in a state where the milled rice is soaked in water. It is known to be a flirty, bland rice.

[0039]

After adding water to the polished rice and stirring it,
In the method for producing unwashed rice, in which the polished rice is separated from the water and the refined rice is subjected to a refining treatment, water of 10 to 30% (by weight) is added to the polished rice, and the agitation is performed by the stirring. By milling the polished rice by 0.5 to 2.0%, the aleurone layer remaining in the polished rice can be surely removed, and when the resulting unwashed rice is cooked, no rice bran odor is generated. In addition, 10 to the polished rice
By adding up to 30% (by weight) of water and stirring, the bran can be separated and removed from the polished rice satisfactorily.
Since the amount of wastewater is small, the size of the wastewater treatment apparatus can be reduced, and the size of the whole rice-free rice manufacturing facility can be reduced.

By performing the treatment from the addition of water to the polished rice to the separation of the water from the polished rice within 1 minute, the refining is performed while the water does not penetrate deep into the polished rice. Can be.

By performing the refining process by ventilation, the refining can be performed by efficiently removing moisture adhering to the surface layer of the polished rice.

By performing the ventilation with warm air, it is possible to dry the polished rice in a short time.

After passing the polished rice with warm air, the polished rice is ventilated at room temperature to be refined, whereby the temperature of the polished rice heated by the warm air can be lowered to room temperature. The quality of white rice does not deteriorate.

By heating and evaporating water separated from the polished rice and drying the bran of the polished rice contained in the water, it is possible to recover only the bran as a solid substance, No wastewater is released from the manufacturing facility.

A non-washed rice producing apparatus is provided with a rice feed section for polished rice at one end and a rice discharge section at each end to form a communication passage for the polished rice, and the rice discharge section is formed as a centrifugal dewatering section. Forming a communication path between the rice feeding section and the centrifugal dewatering section in a milling section, and a milling apparatus in which a water adding means is connected to the milling section, and communicating with the rice discharging section of the milling apparatus. , And a refining device for refining the refined rice discharged from the refining device, the refined rice to which water has been added can be pulverized in a pulverizing unit to remove the aleurone layer, and the aleurone layer can be removed. The polished rice from which the layer has been removed can be refined.

The milling unit is constituted by a screw for feeding the polished rice to the centrifugal dewatering unit side, and a reverse screw provided on the same axis as the screw and on the centrifugal dewatering unit side, By applying a force in the direction opposite to the flowing down direction to the polished rice by the reverse feed screw, the polished rice can be retained and stirred, so that the polishing can be surely performed.

The milling unit and the centrifugal dewatering unit are formed on different axes, and different rotating shafts are respectively provided therein.
On the side of the centrifugal dewatering unit of the reverse feed screw, by providing a screw that forcibly conveys polished rice to the centrifugal dewatering unit, the polishing operation of the polishing unit and the dewatering operation of the centrifugal dewatering unit are separately adjusted. be able to. Further, by the screw provided on the side of the centrifugal dewatering unit of the reverse screw, the milled rice milled by the reverse screw can be immediately supplied to the centrifugal dewatering unit without staying in the milling unit, and water can be supplied. Does not penetrate deep inside the polished rice.

The refining device is composed of a net for conveying the polished rice from the milling device and a ventilation device for ventilating the net, so that a simple and low-cost device can be used. And can perform refining efficiently.

By providing a heating device for heating the ventilation air to the ventilation device, warm air can be passed through the polished rice and drying can be performed in a short time.

In the subsequent step of the above-mentioned refining device, a second refining device is provided for passing the normal-temperature air to the refined rice from the refining device. And reduce the temperature of the polished rice to room temperature,
The quality of polished rice is not reduced.

By connecting the drying device for heating the water from the centrifugal dewatering unit, evaporating the water and drying the bran of the polished rice, the water of the wastewater is evaporated to solidify Only rice bran can be recovered, and no wastewater is released from the rice-free rice production facility.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing one embodiment of the present invention.

FIG. 2 is a sectional view of a milling device.

FIG. 3 is a sectional view of a drying device.

FIG. 4 is a top view of the drying device.

FIG. 5 is a graph showing the relationship between the water content and the water turbidity of the washed rice.

[Description of Signs] 1 Non-washing rice production device 2 Milling device 3 First conditioning device 4 Second conditioning device 5 Discharge port 6 Milling cylinder 7 Supply port 8 Transfer screw 9 Rice feeding cylinder 10 Supply hopper 11 Bearing unit 12 Milling shaft Reference Signs List 13 supply screw 14 reverse screw 15 discharge screw 16 stirring blade 17 lumen 18 water supply device 19 pulley 20 motor 21 hole 22 motor 23 polishing unit 24 centrifugal dewatering unit 25 horizontal transport screw 26 bearing 27 dehydrating cylinder 28 frame 29 supply cylinder 30 Discharge gutter 31 Dewatering shaft 32 Bearing 33 Bearing 34 Dewatering screw 35 Dewatering perforated wall 36 Dehydration chamber 37 Suction cylinder 38 Drainage cylinder 39 Pulley groove 40 Pulley 41 Discharge disk 42 Motor 43 Motor 44 Drain port 45 Support frame 46 Net 47 Rotating body 48 Supply cylinder 49 Rice discharge gutter 50 Upper part Bar 51 Lower cover 52 Conditioning room 53 Exhaust chamber 54 Air supply duct 55 Exhaust duct 56 Motor 57 Supply port 58 Outlet 59 Machine frame 60 Perforated floor 61 Vibration motor 62 Joint 63 Exhaust duct 64 Guide plate 65 Drying device 66 Machine frame 67 Disc 68 Nozzle 69 Scraper 70 Discharge gutter

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Takeshi Kawaguchi 2-30, Saijo Nishihonmachi, Higashihiroshima City, Hiroshima Prefecture Inside Satake Works Co., Ltd. (72) Inventor Kenichi Yokoshima 2-30, Saijo Nishihonmachi, Higashihiroshima City, Hiroshima Prefecture (72) Inventor Koji Kawakami 2-30 Saijo Nishihoncho, Higashihiroshima City, Hiroshima Pref.

Claims (13)

[Claims] Claims 1. After adding water to a polished rice and stirring it,
In the method for producing unwashed rice, in which the polished rice is separated from the water and the refined rice is subjected to a refining treatment, water of 10 to 30% (by weight) is added to the polished rice, and the agitation is performed by the stirring. A non-washed rice production method characterized by milling polished rice by 0.5 to 2.0%. 2. The method for producing unwashed rice according to claim 1, wherein a process from the addition of water to the polished rice to the separation of water from the polished rice is performed within one minute. 3. The method for producing non-washed rice according to claim 1, wherein the refining process is performed by ventilation. 4. The method for producing non-washed rice according to claim 3, wherein the ventilation is performed with warm air. 5. The method for producing unwashed rice according to claim 4, wherein, after passing the polished rice with warm air, the polished rice is ventilated at room temperature to be refined. 6. The method according to claim 1, wherein the water separated from the polished rice is heated and evaporated, and the bran of the polished rice contained in the water is dried. Rice washing production method. 7. A rice feed section for milled rice at one end and a rice discharge section at each end to form a communication passage for the milled rice, and the rice discharge section side of the communication path is formed as a centrifugal dewatering section. A milling device in which the communication path between the rice feeding unit and the centrifugal dewatering unit is formed in a milling unit, and a water adding means is connected to the milling unit.
A non-washing rice producing apparatus, comprising: a refining device that communicates with the rice discharging unit of the polishing device and that refines the polished rice discharged from the polishing device. 8. The milling unit is formed by a screw for feeding the polished rice to the centrifugal dewatering unit side, and a reverse screw provided on the same axis as the screw and on the centrifugal dewatering unit side. The apparatus for producing rice without washing according to claim 7. 9. The milling unit and the centrifugal dewatering unit are formed on different axes, and different rotating shafts are respectively provided inside the centrifugal dewatering unit. 9. The washing-free rice production apparatus according to claim 7, further comprising a screw for forcibly conveying white rice. 10. The non-washed rice production according to claim 7, wherein the refining device comprises a net for conveying the polished rice from the milling device and a ventilation device for ventilating the net. apparatus. 11. The apparatus for producing rice without washing according to claim 10, wherein a heating device for heating the ventilation air is provided to the ventilation device. 12. The non-washed rice production apparatus according to claim 11, further comprising a second conditioning apparatus for passing room temperature air to the polished rice from the conditioning apparatus in a subsequent process of the conditioning apparatus. 13. The centrifugal dewatering unit is connected to a drying device for heating water from the centrifugal dewatering unit, evaporating the water, and drying the bran of the polished rice. A washing-free rice production apparatus according to the present invention.