Currently total production rate of indica variety is about 96% of the total paddy rice produced in the world. Most of the rice mill equipment and facilities for indica type variety have been installed and supplied from Japanese manufacturing company such as Sadake, Yanma and Kaneko etc. Also, most o...
Currently total production rate of indica variety is about 96% of the total paddy rice produced in the world. Most of the rice mill equipment and facilities for indica type variety have been installed and supplied from Japanese manufacturing company such as Sadake, Yanma and Kaneko etc. Also, most of rice milling system are very large scale facilities. Japanese manufacturing companies have controlled these rice mill equipment manufacturing market in the world. Thus, the traditional small scale rice processing mills managed by native people have been in trouble to overcome against these huge gigantic rival. The demands on small scale household rice mill are increasing rapidly. However, household type rice mills manufactured in Korea are known as some serious problems such as its low capacity and short durability. Because it is manufactured for japonica variety milling machine not for indica variety. Thus rice recovery rate of indica variety by the farm household scale milling machine is very low compare with that of japonica variety. Also, major demands from these countries is a compacted system having the capacity of 500 kg/hr. In order to fulfill such demands and improve the milling recovery rate, also, in order to make it to be simply installed in these field, the followings are the detailed objectives for this study. 1) to develop a rice mill for Indica variety 2) having a 500 kg/hr milling capacity 3) having a function such as a sequence operation in a row, "paddy receiving → hulling → brown rice separation → remove stone → milling → packing" 4) having a compacted and all in one system so that it is easy to move and maintain 5) ultimately to develop "an integrated compact rice milling machine for indica variety" In order to develop the rice milling machine, the following steps were conducted; 1) In order to obtain various properties of indica variety, IR36 variety was cultivated at the farm affiliated with the Kyungpook national university at Daegu. 2) Physical properties, geometric shape, mechanical properties and design factors of indica variety were obtained and its milling properties as well from IR36. 3) A rice huller having the 500 kg/hr production capacity of indica variety can be developed based on data obtained at the previous stage. 4) Also, multi-pass rice whitening mill was combined with abrasive type and friction type mills. 5) Besides above two major sub-systems, brown rice separator, stone remover, husk aspirator, were developed. 6) Also, three bucket elevators were developed and equipped with this milling machine and all of these individual machine were designed to handle more than 500 kg/hr without any difficulties. 7) Frame which enable to install and fastening all of individual machine was developed so that this system can be properly operated. 8) Also, this frame height and width was designed 10% smaller than container so that it can easily be shipped. 9) Various tests and modification were made so that it is properly operated. As results of the study the followings can be concluded; 1) In order to obtain various properties of indica variety, IR36 variety was cultivated at the farm affiliated with the Kyungpook national university at Daegu. 2) Also, physical properties, geometric shape, mechanical properties and milling properties of indica variety were obtained and its design factors as well from IR36. Based on the results of the studies, all of properties are similar to that of indica variety which cultivated in south east Asia. It can be judged that it is possible to use these paddy as a testing material for development of the rice mill. 3) The huller and rice milling machine was selected as rubber roller type and abrasive+frictional type with process design. Based on the results of the tests, each equipments were determined capacity. 4) By utilizing the results of various tests and process design in previous stage, unit machines such as hulling, separator and whitening machine could be designed and manufactured. Robber roll huller was applied at this rice mill. 4“×8¾“ roller is judged as optimum size for this mill. Also the clearance between rollers can be adjusted by manual operation. 5) Size of husk aspirator is designed as 130 mm by 260 mm. Also, four impellers as blowers are equipped. 6) Separator after hulling process is consist of paddy separator and air flow separator. As a paddy separator, three layer oscillating sieve are installed. And one layer has a capacity of 250 kg/hr. After paddy separator, sorting by air flow system is installed. and its size is 385×430 mm. 7) Rice whitening system is a kinds of multi-pass mill which is combined with abrasive type and friction type mills. Diameter of abrasive type is 160 mm and its length is 360 mm. Also, Diameter of the friction type mills is 150 mm and length is 278 mm. 8) Frame which enable to install and fastening all of individual machine was developed so that this system can be properly operated. Also, this frame height and width is designed 10% smaller than container so that it can easily be shipped for export as follows; Width is 1,800 mm×height 2,150 mm×length 900 mm. The mill forms three columns. 1st column is husking machine and husk aspirator. 2nd one is paddy separator and sorting machine. The third one is abrasive and friction type mill. Thus it has three bucket elevators. 9) The mill developed in this study was tested, analyzed and modified and results of its performance test were as follows; ① Capacity of hulling machine of this mill is from 580 to 640 kg/hr when roller's clearance is 1.2 mm. Paddy separation has a 630 kg/hr processing capacity when its angle is 10.5° angle. ② In the test of whitening machine, 5 levels of its pressure are controled. It's processing capacity is range within 500.4∼545.2 kg/hr, milled rice recovery rate per brown rice is 84.3∼86.9%, head rice recovery rate per paddy is 59.8∼67.6%, and degree of whitening is 34.9∼36.9%. As a results, it can be judged that this mill. As an overall conclusion, the integrated compact small milling model developed in this study is good enough for milling of indica variety.
Currently total production rate of indica variety is about 96% of the total paddy rice produced in the world. Most of the rice mill equipment and facilities for indica type variety have been installed and supplied from Japanese manufacturing company such as Sadake, Yanma and Kaneko etc. Also, most of rice milling system are very large scale facilities. Japanese manufacturing companies have controlled these rice mill equipment manufacturing market in the world. Thus, the traditional small scale rice processing mills managed by native people have been in trouble to overcome against these huge gigantic rival. The demands on small scale household rice mill are increasing rapidly. However, household type rice mills manufactured in Korea are known as some serious problems such as its low capacity and short durability. Because it is manufactured for japonica variety milling machine not for indica variety. Thus rice recovery rate of indica variety by the farm household scale milling machine is very low compare with that of japonica variety. Also, major demands from these countries is a compacted system having the capacity of 500 kg/hr. In order to fulfill such demands and improve the milling recovery rate, also, in order to make it to be simply installed in these field, the followings are the detailed objectives for this study. 1) to develop a rice mill for Indica variety 2) having a 500 kg/hr milling capacity 3) having a function such as a sequence operation in a row, "paddy receiving → hulling → brown rice separation → remove stone → milling → packing" 4) having a compacted and all in one system so that it is easy to move and maintain 5) ultimately to develop "an integrated compact rice milling machine for indica variety" In order to develop the rice milling machine, the following steps were conducted; 1) In order to obtain various properties of indica variety, IR36 variety was cultivated at the farm affiliated with the Kyungpook national university at Daegu. 2) Physical properties, geometric shape, mechanical properties and design factors of indica variety were obtained and its milling properties as well from IR36. 3) A rice huller having the 500 kg/hr production capacity of indica variety can be developed based on data obtained at the previous stage. 4) Also, multi-pass rice whitening mill was combined with abrasive type and friction type mills. 5) Besides above two major sub-systems, brown rice separator, stone remover, husk aspirator, were developed. 6) Also, three bucket elevators were developed and equipped with this milling machine and all of these individual machine were designed to handle more than 500 kg/hr without any difficulties. 7) Frame which enable to install and fastening all of individual machine was developed so that this system can be properly operated. 8) Also, this frame height and width was designed 10% smaller than container so that it can easily be shipped. 9) Various tests and modification were made so that it is properly operated. As results of the study the followings can be concluded; 1) In order to obtain various properties of indica variety, IR36 variety was cultivated at the farm affiliated with the Kyungpook national university at Daegu. 2) Also, physical properties, geometric shape, mechanical properties and milling properties of indica variety were obtained and its design factors as well from IR36. Based on the results of the studies, all of properties are similar to that of indica variety which cultivated in south east Asia. It can be judged that it is possible to use these paddy as a testing material for development of the rice mill. 3) The huller and rice milling machine was selected as rubber roller type and abrasive+frictional type with process design. Based on the results of the tests, each equipments were determined capacity. 4) By utilizing the results of various tests and process design in previous stage, unit machines such as hulling, separator and whitening machine could be designed and manufactured. Robber roll huller was applied at this rice mill. 4“×8¾“ roller is judged as optimum size for this mill. Also the clearance between rollers can be adjusted by manual operation. 5) Size of husk aspirator is designed as 130 mm by 260 mm. Also, four impellers as blowers are equipped. 6) Separator after hulling process is consist of paddy separator and air flow separator. As a paddy separator, three layer oscillating sieve are installed. And one layer has a capacity of 250 kg/hr. After paddy separator, sorting by air flow system is installed. and its size is 385×430 mm. 7) Rice whitening system is a kinds of multi-pass mill which is combined with abrasive type and friction type mills. Diameter of abrasive type is 160 mm and its length is 360 mm. Also, Diameter of the friction type mills is 150 mm and length is 278 mm. 8) Frame which enable to install and fastening all of individual machine was developed so that this system can be properly operated. Also, this frame height and width is designed 10% smaller than container so that it can easily be shipped for export as follows; Width is 1,800 mm×height 2,150 mm×length 900 mm. The mill forms three columns. 1st column is husking machine and husk aspirator. 2nd one is paddy separator and sorting machine. The third one is abrasive and friction type mill. Thus it has three bucket elevators. 9) The mill developed in this study was tested, analyzed and modified and results of its performance test were as follows; ① Capacity of hulling machine of this mill is from 580 to 640 kg/hr when roller's clearance is 1.2 mm. Paddy separation has a 630 kg/hr processing capacity when its angle is 10.5° angle. ② In the test of whitening machine, 5 levels of its pressure are controled. It's processing capacity is range within 500.4∼545.2 kg/hr, milled rice recovery rate per brown rice is 84.3∼86.9%, head rice recovery rate per paddy is 59.8∼67.6%, and degree of whitening is 34.9∼36.9%. As a results, it can be judged that this mill. As an overall conclusion, the integrated compact small milling model developed in this study is good enough for milling of indica variety.
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