The filter chamber of the plate and frame filter press consists of a flat filter plate and a hollow filter frame. The filter cloth is fixed on the plate frame, which is the main form of the early filter press, the filter chamber of the box filter press is composed of two adjacent recessed filter plates. The main advantage is that it is convenient to replace the filter cloth. The disadvantages are low efficiency, poor filtering effect, and easy damage of the filter plate; the working principle of the box filter press is The filter chamber is formed by the arrangement of filter plates (the two sides of the filter plate are recessed, and every two filter plates are combined into a box-shaped filter chamber).

The surface of the filter plate is provided with pinning points and bosses to support the filter cloth. There are through holes in the center and corners of the filter plate, which form a complete channel after assembly, which can pass into the suspension, washing water and filtrate. Each side of the filter plate has a handle supported on the beam, and the filter plate is pressed by a pressing device. The filter cloth between the filter plates acts as a seal.

The model's main advantages are less feed loss, filtration speed, sealing performance is good, filter cake washing uniform, moisture content is low, and the filter chamber pressure is uniform and not easy to break the board, basically suitable for all solid-liquid separation industry.