Tea is processed into cakes, bricks, clumps and so on by means of high temperature, high humidity and pressure steaming and pressing, which is called “compact tea”. In the early years, most of Yunnan, Hunan, Hubei, Guangxi and other provinces and regions produced Yunnan Qing, black hair tea processing as raw materials. Puer tea, thousand two tea, Fu brick, dark brick and Liu Bao tea are all representative pressed tea products. The autoclaving process in compact press is similar to that of ancient steamed green cake tea. Compressed tea has a long history of production. Around the 11th century, Sichuan tea merchants have steamed green tea into cakes and exported it to northwest China and other places.
The ancient pressed tea, with its emphasis on the production process, was tightly pressed into various shapes on the tea surface, and it became a trend. Zhu Yuanzhang, the emperor of the Ming Dynasty, believed that steamed green cake tea was too luxurious. At one time, the abandoned regiment was scattered. In the twenty-fourth year of Hongwu (1391), he issued an edict. The Dragon troupe is only built with four kinds of tea, namely, spring, spring, spring and purple bamboo shoots. Compressed tea has disappeared from the motherland, only the frontier tea still exists in a tight way; therefore, the background of the times, people think that frontier tea is secondary, low-grade tea, from then on compacted tea has become a non-mainstream tea. After the Pu’er tea became a tribute tea in Qing Dynasty, the compaction technology was further developed. In modern times, compressed tea was the main source of plant nutrients for ethnic minorities in the border areas, and it was also the world’s medicinal tea for Chinese people. The main reason for this pressure is the convenience of transportation and long-term storage, which is in line with the actual demand of tea products.
Beginning in 1999, the upsurge of Pu’er tea in Taiwan, followed by the economic development of the mainland in 2002 to drive consumption level, for Yunnan Pu’er tea attention exceeded expectations. The new wave of upsurge has attracted the attention of new, Malaysian, Japanese, Korean and other countries, and “Yunnan Pu’er Tea” has thus become a representative of tight tea.