The original concept for filter press were the Filter plate & frame, are still used in many industries.The filtration chambers of the filter presses with frames consist of two types of filter plates: frame and filtrating. The frame defines a filtration chamber and it is closed on both sides by the adjacent filtration plates with drainage draining filtrate.The chamber is formed by a piped or slotted grooved flat plate on each side of the frame and Cake formation takes place in the frame.

The thickness of the frame plate determines the thickness of the filtration cake – it usually ranges between 10 – 50 mm. After passing clothes installed on the filtration plates, the filtrate is drained by drainage to channels drilled inside the plate and it is discharged out of the filter press. The working pressure usually ranges between 6 – 15 bars.

Filter plate and frame are still valid solution in application, where filtration area is more important than volume. They are a much sought-after solution for special processes and are used in the production of pharmaceuticals or for the filtration of blood plasma, as well as in the food industry.

Filter plate & frame are available in polypropylene – HP/CP material which application is suitable up to 80C.

Advantages of filter plates and frames,

• Good washing results due to symmetrical cake chambers
• Easy cloth exchange
• Use of cost-effective filter media, such as one-way filter media
• Variable cake thicknesses due to easy exchange of filter frames

A filtration process based on plate and frame systems is a classic pressure filtration. The individual chambers fill with the suspension, causing the filter cake to build up directly on the filter medium. Due to the ever increasing pressure in the chambers, the cake is dewatered – the resulting filtrate is collected separately.

Pressure filtration convinces with very good washing results and a well-formed and homogeneous filter cake.

Chamber filter elements are based on the principle of filter plate and frame systems and are operated in the same way with pressure filtration. The recessed filter plates are the successor of Filter plate and frames. There are 2 basic configurations of Recessed filter plates: Open Discharge & Close Discharge. In both the configuration the chamber depth is ranging from 15mm to 50mm to suit a wide variety of slurries.

Chamber filter elements are a further development of filter plate and frame systems and are operated in the same way with classic pressure filtration. Here, the individual chambers gradually fill with the suspension, causing the filter cake to build up layer by layer directly on the filter medium. Due to the ever increasing pressure in the chambers, the cake is dewatered - the escaping filtrate is collected separately.

Pressure filtration convinces with very good washing results as well as a well-formed and homogeneous filter cake. However, longer filtration times may occur with compressible products. For an efficient filtration process, we therefore recommend the additional use of membrane filter elements as a mixed pack.

• 100 % virgin polypropylene filter plates
• Excellent quality, high machining accuracy and good finishing
• Extended life
• Suitable for high filtration temperatures
• Low operation and maintenance cost
• They are single piece molding which prevents the problem of cracking, leakage and corrosion.
• Cloth is simpler to install.
• Has a special piped surface to protect the filter cloth and ensure excellent filtration
• Suitable for high filtration temperatures.
• Robust design with reinforced edges.
• Universal customization – tailored to application and individual customer requirements

These are advance version of Recessed Chamber Closed configuration plates, where Filter Cloth is caulked in the caulking groove around the recess plate. Major benefits of this design are Zero leak Recess Type Filter Plate because ‘O’ Ring seats around the sealing edge and filtrate hole secure tight seal when the plate pack is closed. Cloth caulking groove provide easy installation and least maintenance of the filter cloth. CGR plates are recommended and necessary for leak proof conditions like toxic substance, acidic solutions etc. ‘O’ Ring are available in the different elastomers like EPDM, Neoprene, viton etc. These plates are available with center, top, bottom and corner feeding with adaptable diameter and designed at 8 and 16 bar operating pressure.

There are a number of key advantages in using a CGR filter 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