A filter press is a mechanical device used for solid-liquid separation. It is driven by pressure to trap solid particles in the suspension on the surface of the filter medium (such as filter cloth) to form a filter cake, and the liquid (filtrate) is discharged through the filter medium. It is mainly used in the chemical, pharmaceutical, food, environmental protection (such as sludge dehydration) and other industries, with the characteristics of high separation efficiency and simple operation. Common types include plate and frame filter press, chamber filter press, diaphragm filter press, etc.