Rice Quality Training Manual 11

Rice Quality Training Manual
7.0 Measuring physical properties of milled rice
Milling degree
Milling degree is computed based on the amount of bran removed from the brown rice. To obtain the weight of brown rice, dehull the paddy samples using the Laboratory Huller.
Estimate the percent milling degree using the following equation:
Milling recovery
Using the Abrasive Whitener, mill the dehulled samples. Compute milling recovery by dividing the weight of milled rice recovered by the weight of the paddy sample.
Dockage
Select, segregate and weigh the foreign matter. Record the number of unhulled grains collected from the sample. Determine the percentage of dockage of milled rice using the equation:
Broken grain
Using the Grain Grader, separate the broken grain from the whole grains.
Chalkiness
A visual rating of the chalky proportion of the grain is used to measure chalkiness based on the · Select, segregate and weigh the chalky grains (SES Scale 9). Determine the % chalky grain using the equation:
Whiteness
· Measure the grain whiteness using the Whiteness Meter.
· Separate and weigh yellow-fermented grains. Calculate the percentage of yellow/fermented grains using the formula:
Grain Shape
· Follow the procedure of determining grain shape of paddy. Based on the length to width ratio, the shape of the milled rice will be determined.