Discussion
Paddy is dried from 24 to 14 per cent in one continuous pass and the mill later reports a sharp fall in head rice yield.
What should be changed?
Answer: C
Correct answer: Dry in stages with tempering between
Removing ten points of moisture in one continuous pass creates a steep gradient between the surface and the centre of each kernel. The differential shrinkage sets up internal stresses that fissure the grain, and those fissures break during milling - which is exactly what a fall in head rice yield reports.
Drying in stages with tempering between passes lets the gradients relax before they can crack the kernel, and it is the standard remedy. Raising the temperature or the air flow would dry the surface faster still and make the problem worse, and a lower final moisture would compound it.
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