A diaphragm filter press is a solid-liquid separation device that utilizes an elastic diaphragm to perform secondary squeezing of the filter cake, primarily used in industries such as chemical, environmental protection, pharmaceutical, and food processing. By incorporating diaphragm technology into the filter plates, it significantly enhances the solid dryness. Compared to traditional filtration processes, it achieves the lowest residual moisture content in the filter cake, making it one of the most robust and widely applied systems. Special materials such as PVDF are also available for specific requirements.
The working principle involves adding an elastic membrane between the filter plates and the filter cloth of a standard filter press. After the filter chamber completes feeding, high-pressure fluid or gas is injected into the diaphragm, causing it to expand and compress the filter cake. This further squeezes liquid out of the filter cake, significantly reducing its moisture content.