FILTER PLATES
Filter press plates for chamber filter presses and membrane filter presses are primarily chemically resistant and pressure-resistant plastic plates made of PP. Together with the overhanging filter cloth, these form the process space for cake filtration in the filter press and are mainly responsible for solid/liquid separation. Special materials for higher temperatures up to +130°C and for lower temperatures down to -10°C are also available for continuous operation. The drainage surface integrated into the filter press plates is designed with Pipes or grooves. This supports the filter cloth on the one hand and allows the filtrate to flow off in a defined manner on the other. Process-technical parameters for the selection of a filter plate for your individual application are the filter area, the chamber depth or the filter cake thickness, and the degree of dewatering. This results in the chamber or cake volume as well as the filter plate type.
Essential aspects of the design depend on the optional process steps such as filter cake washing, filter cake drying as well as core blowing, and much more. The criteria for selecting the right filter plate specifically include:
• Chemical resistance
• Differential pressure resistance
• Temperature stability
• Filter cloth support
• Drain ability (grooves, Pipes, with/without membrane technology)
Filter Plates & Their Different Variations
Filter cake thicknesses and filter plate thicknesses are freely configurable depending on the application and filtration conditions. The plate formats vary from 250mm x 250mm up to 2000mm x 2000mm with a cake thickness of 10mm up to 55mm and thus allow an optimal adaptation to the filtration tasks. In this context, we offer a variety of inlet types and plate designs with chamber or membrane technology for older as well as newer makes and third-party systems. Depending on the application, the inlet positions are located in the upper corner, in the center, or on the upper side of the filter plate.
Filter press plates with membrane technology allow mechanical squeezing of the filter cake after the actual filtration process, which results in a higher dry matter content. These filter press plates are available either with permanently integrated membranes or with replaceable membranes on request.
Chamber filter press plates and membrane filter press plates can also be supplied in gas-tight & drip-tight designs (CGR). Depending on customer requirements, filter press plates can be individually designed and retrofitted to any existing and commissioned filter press.
Filter presses from N.M Patel Filter Presses meet the specific requirements of different applications and industries by equipping each filter press with the appropriate filter plates.
Standard sizes – 250mm x 250mm, 310mm x 310mm, 350mm x 350mm, 410mm x 410mm, 470mm x 470mm, 500mm x 500mm, 610mm x 610mm, 800mm x 800mm, 915mm x 915mm, 1000mm x 1000mm, 1060mm x 1060mm, 1200mm x 1200mm, 1500mm x 1500mm, 1500mm x 2000mm, 2000mm x 2000mm.
Recessed Chamber
This is the most common type of filter plate. The filter cloth is hung or draped over the filter plate. Filtration takes place as filtrate passes through the cloth and drains out through the raised pips to the corner discharge holes.
• Standard web thickness (For 100 or 225 psi, maximum feed pressure)
• Available in Polypropylene for standard operations
• Durco-Temp™ high-temperature thermoplastic for high temp application
Caulked and Gasketted
Designed to prevent leaking during the filtration cycle.
Plates have a caulking groove just outside the recessed portion of the plate, and cloths have a rope sewn in the edge that is inserted in the caulking groove.
A second groove is provided in the perimeter sealing surface on one side of each plate and the gasket fits in this groove to contact the adjacent plate and prevent slurry leakage across the sealing surface.
Another circular groove on one side of each plate surrounds each corner eye and a gasket fits in each corner eye groove to prevent leakage across the sealing surface.
Corner Feed
Used when solid in the slurry stream has a high specific gravity.
Allows filter chambers to be filled completely when heavy slurries are dewatered.
Membrane
The filter plate has three layers: a central web or support. Thin membranes are on either side.
Filtration takes place the same as with a recessed chamber plate.
When the cycle is finished, the spaces between the web and membranes are inflated with air or water. This squeezes the cake between the plates resulting in dryer cake.
Often, membrane plates are mixed with companion non-membrane plates. Referred to as “Mixed Pack”.
Cast Iron & Aluminium
Metal Plates in cast iron, stainless steel, aluminum, or other materials are used for higher temperatures or other unique applications.