Patent ID: 8617389

Claim:
A device for filtering a liquid processing medium used in a shaping operation performed by cutting, the device comprising: an intake for a contaminated processing medium; first filter cells each comprising an inlet, a filter element, and an outlet, wherein the filter element is adapted to be back-flushed; a discharge for purified processing medium; a disposal container; a suction and/or conveying device; wherein, for filtering the contaminated processing medium, the intake is connected with the inlets of the first filter cells by a first valve, respectively, and the outlets of the first filter cells are connected to the discharge for the purified processing medium; wherein, for back-flushing the filter elements of the first filter cells, at least one of the inlets of the first filter cells is connected either through the first valve or a further valve to the disposal container and not to the intake; at least one second filter cell comprising a filter element for contaminated processing medium of the disposal container, the at least one second filter cell disposed above or at least partially inside the disposal container; wherein the at least one second filter cell, for filtering the contaminated processing medium of the disposal container, is connected by the suction and/or conveying device to the discharge for the purified processing medium; and a cleaning device for the at least one second filter cell wherein waste products removed during cleaning pass from a filter element of the at least one second filter cell directly into the disposal container.