Visit a rice mill and sample the paddy before milling, brown rice after husking and the milled grain after processing. At the same time, monitor the performance of the rice mill by collecting the outputs from all of the outlets from the mill over a given time period.
The following samples need to be collected and weighed at the rice mill
· Head rice
· Course brokens
· Fine brokens
· Brewers rice
· Course bran
· Fine bran ("meal")
· Husk
Time
Samples will be collected for 10 minutes from each outlet. An open woven bag will be necessary to collect the husk.
Weighing
Use the miller’s scales
Sub-sampling
Sub samples will be taken from each of the outlets so that they can be analyzed in the laboratory
Sampling times. Sampling times will depend on the capacity of the mill. A good benchmark is to collect from each outlet for at least 10 minutes.
Expected outputs. A good quality mill will produce 55% head rice, 15% brokens, 10% bran and 20% husk, all on % paddy weight basis
Sampling outputs. Collect a grain sample from the paddy, brown rice and from all stages of the process. Check the list.
Sample
Collect (yes)
Sample
Collect (yes)
Paddy
Head rice
Brown rice
Large broken
Ist whitener
Medium
2nd whitener
Small
Polisher
Brewers
Bran
Husk
Make an assessment of where in the rice mill improvements could be made to improve the milling output.
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