Our folding belt filter (FBF) is a special version of a pressure belt filter. As a fully automatic cooling lubricant filter, our FBF is fed discontinuously with contaminated cooling lubricant via filter pumps. The coolant to be filtered is pressed through the filter medium with overpressure. The cooling lubricant is cleaned via a circulating filter medium or via fiber fleece as a consumable. After free discharge into a clean tank, the cleaned cooling lubricant is available again to supply production. The filtered dirt cake is blown dry in the KBF and then discharged for chip disposal.