Tea World

Lesson 24

Machine used in Fermention

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Fermenting Drum

The fermenting drum is a simple cylindrical drum with conical feeding and discharge ends.The standard drum is 4.8-6.1 m (16-20 feet) long and has a diameter of 1.5m (5 feet) at the cylindrical portion.The total length of the conical segment  is 4 feet. The capacity of the drum is 5.2 kg of rolled leaf for every square meter of the drum.

Continuous Fermenting Machine

It consists of a tray made up of conveyor racks with three to four tier systems. The fermented leaves travel in a thin layer on the conveyor rack. Above or below the tray, UV lamps are fitted which are used to kill the external bacteria and triggers the activity of polyphenol oxidase, thereby hastening the biochemical reaction. It helps to eliminate microbial contamination in tea which normally occurs during tea processing due to the presence of a layer of fermented juice on the processing machines and other equipments.


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