Experiments on the C.C.C. Single Action Tea Roller

概要

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1. The manufacturing method of black tea by the C.C.C. single action tea roller imported from Ceylon was examined with shears-plucked leaves during 1955-1957. 2. The optimum feed rate of tea leaves for this roller was decided to be about 113 kg. (in the case of withering degree of 30-35%, which corresponded to 20% ess amount applied in India and Ceylon where handplucked leaves were used. 3. On the above charging amount of fresh leaves, it was suitable that the revolution was 43 r. p. m. and the operation time was 40 min. for the 1st rolling, 30 min. for the 2nd. 4. The most reasonable application of this roller seemed to be the combined use with the ordinary roller, it was favorable that in the 1st rolling the tea leaves were rolled by the ordinary roller and in the 2nd by the C.C.C. roller with high pressure. 5. To eliminate the deterioration of the quality of tea by rising of leaf temperature during the rolling, it was necessary to putting on and taking off the weight of roller lid frequently and not to continue to press the leaves hard for long time. 6. When the C.C.C. roller was used in the 1st rolling, it was recommended that the pressure of lid had to hold as light as possible and prolong the operation time 10 min. longer for each rolling process.
日本茶業技術協会の論文