Infrared drying of rough-rice

Date

1993

Abstract

Drying tests of rough rice using infrared heat source at three heights from the grain (5, 6 and 7 inches) using metal and wooden containers and different grain thickness (1/4, ½, 1 and 1 ½ inches) were performed. The drying performance and germination of rough rice samples were determined. The drying time as effected by the conduction and non conduction of container as well as the quality of milled rice were compared among those treatment combination. Both continuous and intermittent drying of paddy grain were conducted. Drying rate, germination, percentage cracked grains, head grain recovery and total milling recovery were the parameters analysed in both drying methods. The experiments were conducted using a randomized complete block design. Results showed that for both drying methods, at the same distance of the lamp, increasing the thickness of the grain increased the drying rate. At increasing distance of the lamp, drying time is increased and drying rate was decreased. Longer drying time was noted in using the wooden tray than in using the metal tray. Germination rates for both drying method showed an increasing trend with increasing thickness of the grain, for the same distance of the lamp. Also higher germination rates were noted in using the metal tray than using the wooden tray. Generally, increased grain thickness caused lower percentage of cracked grains and higher percentages of head rice and total milling recovery. Lower percentage of cracked grain and higher percentage of head grain and total milling recovery were noted in using the metal tray than in using the wooden tray. Comparison with the control, showed much better performance of the control treatment in terms of germination rate, percentage cracked grain and head grain recovery than the treatment combinations especially in the continuous drying. For infrared drying of rough rice, a 1 ½ inches grain thickness and 6-inch clearance between the lamp and the grain, using a metal tray was found to be the best combination in attained the best level of grain germination, head grain and total milling recovery under intermittent drying method.

Document Type

Master Thesis

Degree

Master of Science in in Agricultural Engineering

Language

English

LC Subject

Rice-Drying, Drying apparatus

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 995 1993 A2 K56

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