Abstract: A self-cleaning system for a plate press (100) or cylinder press (110) for filtering a fluid product and for eliminating waste material accumulated on filter membranes (13) in a waste accumulation area (102) of the plate press (100) or cylinder press (110), said system comprising a drain port (DP) adjacent to the waste accumulation area (102), said system comprising an area (103) creating a circulation of water and/or forced air jets within the waste accumulation area (102) to expel the waste to the drain port (DP), whereby the waste accumulation area (102) is cleaned from the waste material without having to disassemble the plate press or cylinder press.

Abstract: The disclosure herein describes a device for use in a sap collecting system which is formed of a body of fluid impermeable composition that has a passageway for allowing sap to circulate therethrough; the composition consists of a plastics material and of a plurality of randomly distributed non corrosive hard granules. The granules have a hardness to repress rodent animals to pierce the plastics material and are so distributed in the plastic material that at least one granule will be contacted when the body is gnawed by a rodent animal.