Filter Development History

Filtration technology was already used in ancient China to produce paper made of plant fibers in 200 BC. In 105, Cai Lun improved the papermaking method. In the process of making paper, he uses plant fiber pulp on dense thin bamboo curtains. The water is filtered through the cracks of the bamboo curtain, and a thin layer of wet pulp is left on the surface of the bamboo curtain, which becomes paper after drying.

The earliest filtration was mostly gravity filtration, and later pressurized filtration was used to improve the filtration speed, and then vacuum filtration appeared. The rotary drum vacuum filter invented in the early 20th century realized the continuous filtration operation. Since then, various types of continuous filters have appeared. Intermittently operated filters (such as plate and frame press filters, etc.) have been developed because they can achieve automated operation, and the filtration area is becoming larger and larger. In order to obtain the filter residue with low moisture content, the filter with mechanical press has been developed.