Unprocessed tea is the tea that green tea growers sell to green tea producers who process the leaves into green tea. In the video we can see the picked leaves being pushed forward in a machine. The first stage in processing is steaming. This preserves the green color of the leaves by preventing an enzyme in the leaves from working. The steamed tea leaves are moved forward by a conveyer belt to the next stage which is primary drying.
Drying and kneading is done in several machines using different processes.
Finally this sci-fi looking machine kneads the tea leaves and they become unprocessed green tea. From beginning to end the process takes about 3 hours. Tea producing companies then test the tea, heat it, and blend it to make the Japanese green tea that everyone enjoys at home.