Studies on the Screening Process of Tea (Part 1):Investigation on the Horizontal Screen

概要

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1. The screening properties and the optimum operating conditions of a horizontal screen for refining tea were examined. 2. In the horizontal screen of batch type, the shaking time affected the rate of undersize tea very much. Tamaryokutya of round shape was sieved faster than sentya of long shape, and the screening with narrower opening sieve required longer time than that with wider opening sieve until it was finished. 3. Smaller grains were sieved faster and larger long ones were delayed in screening. 4. As the feed rate of tea was increased, the rate of under-size tea was decreased, especially at the beginning of screening, and this tendency was also observed even though the screening was prolonged. 5. The following HASHIMOTO'S equation was proved to be available to decide the optimum operating conditions in tea screening. NB0.585=2, 000-2, 500 where, N: optimum vibration (per min.), B: amplitude of vibration (mm.). 6.The rate of under-size tea gained by the low-speed vibrating screen(shaking screen) showed no difference between the horizontal amplitude of 27-106 mm. so far-as the screen was operated at near the optimum vibration, while that gained by the highspeed vibrating screen with the vertical amplitude of 2 mm. was less than the former. So, it. was more favorable to use a low-speed vibrating screen having a larger amplitude for screening tea.
日本茶業技術協会の論文