Longone - Membrane Filter Plates

Membrane plate

Membrane Filter Plates offer a number of advantages including drier filter cakes & increased solids; faster cycle times; improved cake washing capabilities; and increased production rates. The principal types of Membrane Recessed Plates include Fixed Membranes and Replaceable Membranes.

“Mixed Pack” Membrane Filter Plates – as shown here – are a configuration in which one recessed (chamber) filter plate is alternated with one membrane plate in the plate pack. Use of these Mixed Packs – where the diaphragm (membrane squeeze) plates alternate with the recessed plates – not only deliver reduced cake moisture because of the added squeeze but, importantly, substantial cost-savings in overall plate pack costs vs. the full membrane squeeze pack design.

Membrane plates are used to reduce the cake moisture content or shorten the filtration cycle time. Mixed Pack Membranes are the most common configuration due to the savings in the overall plate pack cost.

Membrane plates usually operate at a feed pressure of up to 7 bar and squeeze pressure up to 15 bar. Special plates can be designed to accept higher feed and squeeze pressures.

Fixed Membranes are most commonly 100% polypropylene but, thermoplastic is also available. The plate is manufactured by molding a face membrane and a core plate separately. The face membranes are then joined into the core by heat welding to form a homogeneous plate. Although this type of membrane is suitable for many designs, it has particular advantages in food applications, where the lack of joints will prevent contamination.

Replaceable Membranes use a polypropylene core, which is machined to accept the connection and seal of a rubber membrane. These faces are easily changed. EPDM thermoplastic and other compounds are used for specific conditions. Savings in operation can be achieved in difficult environments and the membrane’s superior flexibility make it the best design for many installations.

Reduction in Moisture content in the final filter cake

Reduction in Filtration, Washing as well discharge time.

Reduction of washing liquid consumption due to more homogeneous cake structure.

Increased Uniformity in dewatering of the filter cake.

Higher dry solids content

Improvement in cake release from the filter press.

Saving in filtration process cost and time.

Reduced air consumption during blow-drying