One function of the filter plate is to enhance the effectiveness of the filter chamber walls, thereby increasing the area of filter cloth attached to the plate. In the initial design of a pressure filter, to accommodate the filtering purpose, the direct approach to achieve this is to increase the area of the filter cloth within the machine. Since the filter cloth is attached to the filter plate walls, it necessitates expanding the area of the filter chamber walls within the limited space. The filter chamber of a pressure filter is composed of individual filter plates, with each plate's area serving as the filter chamber wall. Each plate can also have a corresponding filter cloth filtering area. As long as within the pressure and load-bearing capacity range, the effective filtering area of the pressure filter can be increased several times over. This is the crucial role of the filter plate in a pressure filter, and also the reason why filter plates are indispensable in all pressure filter equipment.
Another function of filter plates is to establish an intermediate storage for filter cake. The filter plates of the pressure filter are initially designed with an inward concave shape, which allows for space to store the volume of the filter cake when intercepted by the filter cloth. The blind spot at the bottom is also designed to increase friction with the filter cake, enhancing its support. Thus, filter plates play a storage and support role for the filter cake.
In summary, filter cloth in pressure filters plays a crucial role in establishing storage space for filter cake and increasing the filter wall area, which is a necessary condition for the application of pressure filters in today's high-speed industrial production.