The working principle of the box filter press is composed of filter plates arranged to form filter chambers (the sides of each filter plate are indented, and two plates combined form a box-shaped filter chamber).

The filter plates have dimples and raised platforms on their surfaces for supporting the filter cloth. There are through-holes in the center and corners of the filter plates, which, upon assembly, form a complete passage for the suspension liquid, washing water, and the extraction of filtrate. Handles on both sides of the filter plates are supported by crossbeams and are clamped to secure the filter plates. The filter cloth between the plates serves as a seal.

Under the pressure of the feed pump, the material liquid to be filtered is sent into each filter chamber. Solid and liquid are separated through the filter medium (suitable filter cloth selected based on different industries). Sludge forms on the filter cloth until it fills the filter chamber to create a filter cake. The filtrate passes through the filter cloth and flows along the filter plate grooves to the lower liquid outlet channel, where it is discharged集中. After filtration, the filter cake can be washed with cleaning water. Sometimes, compressed air is introduced after washing to remove any remaining cleaning liquid. At the end of the filtration, the pressure filter is opened to remove the filter cake (stored between adjacent filter plates), clean the filter cloth, and then re-tighten the plate filter to begin the next work cycle.