Studies on the Through-Flow Drying of Tea (Part 2)

概要

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The mechanism of throgh-flow drying of rolled black tea leaves was studied under various drying conditions. The experimental results are shown in figures: (a) The equipment employed in Fig. 1, (b) the drying curves in Figs. 5-20, (c) the distribution of leaf temperature in Figs. 21, 22, (d) the air pressure drop through the leaf bed in Figs. 23, 24.<BR>Under some conditions, a constant-rate drying period was observed in the case. of the through-flow drying of tea leaves which was never shown in the parallel drying. During the constant-rate drying, the air left the bed almost saturated, this quick saturation was presumed to take place .in a narrow vaporizing zone which gradually moved downward through the wet bed leaving a dry bed above. When the zone reached the bottom of the bed the drying rate began to decrease.
日本茶業技術協会の論文