Filter for extruder press

A solid/fluid separating press, comprising at least one conveyor screw for conveying a solid/fluid mixture and a barrel divided into at least two barrel modules respectively defining a longitudinal portion of a core passage for housing the at least one conveyor screw, at least one of the barrel modules constructed as a solid/fluid separation module including

• a pair of mounting plates for connection to adjacent barrel modules and a split filter unit fastened between the mounting plates;
• the split filter unit including a plurality of barrel plates stacked one behind the other and sealingly compressed into a plate stack between a pair of end plates, each barrel plate having a front face and a back face and each mounting plate, end plate and barrel plate having a core opening equal in cross-section to the core passage, each end plate being divided along a plane of symmetry of the core passage into first and second end plate sections and each barrel plate being divided along the plane of symmetry into first and second split plates;
• at least one split plate adjacent one of the end plate sections being a perforated split plate having a drainage perforation separate from the core opening, the drainage perforation extending from the front face to the back face,
• a stacking structure for aligning the first split plates into a first plate stack and the second split plates into a second plate stack, wherein the first and second split plates are stacked one behind the other in the first and second plate stack and compressed between the first and second end plate sections into first and second filter blocks respectively;
• a clamping structure for clamping the first and second filter blocks together along the plane of symmetry to form the split filter unit;
• all mounting plates, end plate sections, split plates and perforated split plates in the separation module being oriented for the core openings to align and form the core passage of the separation module and all perforated split plates being further aligned for the drainage perforations to align and form an internal fluid collection chamber within the respective first or second filter block;
• at least one of the perforated split plates being constructed as a filter plate including at least one filter passage extending from the core opening to the drainage perforation;
• and
• at least one of the end plate sections having an evacuation passage connected at an input end with the collection chamber and at an output end with an exterior of the split filter unit for draining from the collection chamber separated fluids that were separated from the solid/fluid mixture through the filter passage.

A filter unit for use in a solid/fluid separating press having a core passage for containing a pressurized solid/fluid mixture, and housing at least one conveyor screw for conveying the solid/fluid mixture, the barrel being divided into at least two barrel modules respectively defining an axial portion of the barrel, the solid/fluid separation module being constructed for forming at least one of the barrel modules and including a pair of mounting plates for connection to adjacent barrel modules and the filter unit fastened between the mounting plates, the filter unit comprising

• a plurality of barrel plates stacked one behind the other and sealingly compressed into a plate stack between a pair of end plates, each barrel plate having a front face and a back face and each end plate and barrel plate having a core opening equal in cross-section to the core passage of the separating press;
• at least one barrel plate adjacent one of the end plates being a perforated barrel plate having a drainage perforation separate from the core opening, the core opening and drainage perforation each extending from the front face to the back face, all end plates, barrel plates and perforated barrel plates in the filter unit being oriented for the core openings to align and form the core passage of the filter unit and all perforated barrel plates being further aligned for the drainage perforations to align and form an internal fluid collection chamber within the filter unit;
• at least one of the perforated barrel plates being constructed as a filter plate including at least one filter passage extending from the core opening to the drainage perforation;
• and
• at least one of the end plates having an evacuation passage connected at an input end with the collection chamber and at an output end with an exterior of the filter unit for draining from the collection chamber separated fluids that were separated from the solid/fluid mixture through the filter passage.