| Author | Tanya Niyamapa |
| Call Number | AIT Thesis no.AE-78-15 |
| Subject(s) | Rice processing machines
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Threshing of paddy by conventional methods consume a large amount of human and animal power. During the peak threshing season there is a shortage of labour and to overcome the labour shortage problem mechanical threshers
are widely being used. In Thailand the axial flow thresher developed by IRRI is becoming popular. Though these threshers are widely used it is not
so satisfactory as it leaves spikelets on paddy kernels in some varieties (e.g. No. 16 and RD 5, 5%; Khao Setti 14%) which reduces the market price
considerably. In this research a machine was developed to remove the spikelets. The
machine was constructed to serve the purpose of laboratory testing mainly to identify design parameters. The machine basically consists of two vertical
plates, one of which rotates on its axis where as the other remains stationary. There is a spring pressing the rotary plate against the stationary plate.
During operation the grain is rubbed between these two plates resulting in the removal of spikelets. Tests were conducted in order to find the suitable
material for the plate surface to get maximum removal of spikelets with minimum damage to the grain. In test, very soft foam rubber with a coat of
hard elastic rubber with slightly rough surface on rotary plate and hard foam rubber on stationary plate was found to have low wear out rate while
achieving about 48 percent of spikelets removal at certain operating conditions. Experiments conducted indicated that the capability of the machine to remove spikelets from particular paddy grains depends upon the magnitudes
set for the compression force on the rotary plate, spacing between stationary and rotary plates, angle of the stationary plate at the inlet opening, speed
of the rotary plate, and to a minor extent on the moisture content of the test paddy. |
| Year | 1978 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Singh, Gajendra |
| Examination Committee(s) | Jindal, Vinod Kumar ; Ito, Nobutaka
|
| Scholarship Donor(s) | Government of Belgium |
| Degree | Thesis (M.Eng.)- Asian Institute of Technology, 1978 |