Membrane filter press plates utilize an impermeable, flexible member attached to the filter press plate core. This terminology should not be confused with sub micron “membranes” used in ultra filtration or reverse osmosis. In filter presses, a membrane, also called a diaphragm, is designed to inflate by compressed air or pressurized water to squeeze residual moisture out of the formed filter cake. Polypropylene membrane plates supplied in FILTER PRESS INDIA Filter Presses have been in use for more than ten years with significant success. Theses plates are currently in many severe applications – some operating two cycles per hour, 24 hours per day for two years – tens of thousand of cycles without failure.
Conventional filter presses filter only 75-80% of the batch in the first 50% of the cycle time. If the plate stack is opened before the full cycle is complete, the result is a wet, sloppy cake.
A Membrane Filter Press, however, can be stopped at the most efficient point in its cycle. By applying pressure to the membrane built into the filter plate, the cake is squeezed to achieve final solids content in a significantly reduced cycle time.
FILTER PRESS INDIA Membrane Filter Presses improve cake washing by initiating a low-pressure pre-squeeze before the wash cycle is begun. This pre-squeeze eliminates channeling (cracks and less well-formed areas of the cake) and produces a uniform, homogeneous filter cake and optimum wash efficiency. Highest Cake Solids: By applying a high pressure squeeze to the filter cake you produce the final cake with solids content from 50 to 100% greater than can be achieved with conventional filter presses. This is important for both maximum yield, where a high value liquid is your product, or high solids-content, where reduced moisture in the final cake is critical.
A FILTER PRESS INDIA Membrane Filter Press provides a dryer cake than can be obtained using high feed pumping pressure in a conventional filter press. It significantly reduces or eliminates downstream thermal drying and associated costs in energy and time.
FILTER PRESS INDIA recommends corner-feed plates because of their numerous design advantages for virtually every filter press installation.FILTER PRESS INDIA features this design in its Membrane Filter Presses as well as in conventional filter presses.
Corner-feed design offers the most efficient cake formation and provides even solids distribution through-out the plate stack. More importantly, eliminating a center-feed eye allows construction of a stronger plate requiring no supporting stay bosses which hamper thorough cake washing and cake discharge.
With a center-feed filter plate, cake washing is difficult due to wash water “short circuiting” through the open center-feed eye. Corner-feed is the only plate design which insures thorough cake washing integrity.