About an Introduction Method of a Primary Tea Rolling Dryer and a Fixed Drum Type Secondary Tea Rolling Dryer to Manufacturing Process of Kamairicha and the Effect

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  • 釜炒り茶製茶工程への粗揉機及び背面中揉機の導入方法とその効果について
  • カマ イリ チャ セイチャ コウテイ エ ノ アラモミキ オヨビ ハイメン ナカモミキ ノ ドウニュウ ホウホウ ト ソノ コウカ ニ ツイテ

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Abstract

Manufacturing kamairicha has proven difficult due to its low production capacity. To improve its capacity, a primary tea rolling dryer that has been used in the manufacturing of sencha was introduced. Based on the sencha process, an initial method for manufacturing kamairicha was developed: parching → primary tea rolling dryer → tea roller → secondary tea rolling dryer. Unlike steaming of sencha, parching is the first step of the kamairicha process for inactivation of enzymes in the tea leaves. In this case, falling rate drying period is apt to occur. To allow the moisture in the leaves to be uniformly distributed, we proposed a new kamairicha manufacturing process: parching → tea roller → primary tea rolling dryer → secondary tea rolling dryer. This new method allows the moisture in the leaves to move to the surface before the primary tea rolling dryer step, resulting in a more efficient primary tea rolling dryer step without falling rate drying period. Moreover, the time required for the secondary tea rolling dryer step was reduced by about 30-50%, and the quality of crude tea was improved. At the start of the primary tea rolling dryer step, the moisture content of the tea leaves was about 150%d.b.. As the tea leaves had a lower moisture content, we decided to use the fixed drum-type secondary tea rolling dryer instead of the primary tea rolling dryer. This machine is smaller, more economical than the primary tea rolling dryer. In the case of this, the quality of crude tea and production capacity remained similar to those using the primary tea rolling dryer but the fuel consumption was reduced by about 15-25%.

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