| PRESSOFILTRO® Filter/Filter-dryer |
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For more than 40 years COMBER has been manufacturing
the PRESSOFILTRO®, a Nutsche filter and
filter/dryer for pressure and/or vacuum operation. The machines are used for: • Discontinuous solids / liquid separation • Efficient cake washing, including reslurrying • Vacuum drying of the product whereby all processes are performed in one machine. The machines are designed and
built per cGMP and FDA guidelines. |
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The special agitator
design permits the filtration, washing and drying operations all to be performed in a
single machine, making the PRESSOFILTRO® a
truly universal machine. |
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important features of the PRESSOFILTRO® are: • Cylindrical, vertical pressure vessel with dished top head and welded or flanged flat base • The base of the filters is either welded to the cylindrical section of the vessel or connected with flanges. The flanges are locked using traditional clamps or a bayonet system • Heating / cooling jackets and / or half-pipe coils on vessel, top head and flat base • Optional heating with microwaves (click here) |
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| • The agitator
(heated or unheated) is installed on the top - Speed adjustable using frequency converters with electric drives or control valves with hydraulic drives - Four movement possibilities: clockwise and counterclockwise rotation as well as raising and lowering. - Simultaneous rotational and vertical motions result in the following advantages: - Very efficient mixing of the entire product mass, also preventing local overheating - Agitator blockages are prevented by controlling the lowering movement of the agitator - Sensitive products can be protected by reducing the shear forces acting on the product to an absolute minimum - Highly viscous products can be dried faster by lifting the product lump formed in the machine |
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| • Agitator with two or three arms. The arms are designed with a unique
profile to smooth and press the filter cake as well as to “plough” the cake, for
good mixing of the product and to discharge the dried product • The agitator profile allows for very efficient heat exchange with heated agitators • Vertical scrapers installed at the ends of the agitator arms to prevent product adherence to the vessel wall, avoiding local overheating of the product. Additionally, this minimizes the product quantity remaining in the machine after discharging • Sealing of the agitator shaft with double mechanical seal and bellows • The version for sterile applications has welded shaft connections to provide for ease of cleaning • Linear stroke measurement system for vertical position indication of the agitator. |
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• Filter elements
as specified to meet material and porosity requirements - Cloth (cotton, polypropylene, etc.) - Single layer metal filter mesh inserts - Sintered plates - Multilayer metal filter mesh, sintered The version for sterile applications has the filter elements mounted from the bottom up to prevent bolts in contact with the product. • Mechanical seal and metal bellows: the double mechanical seal is installed on the dished top head, above the area wetted by the product and is well accessible for cleaning and maintenance purposes. Dry or wet running mechanical seals may be installed. The agitator shaft is sealed by a metal bellows over its full length. • Advantages of mechanical seal and metal bellows: - Better final vacuum - No hazardous leakage or emissions - No product contamination - Possibility of sterile operation - Failure detection system for mechanical seal - Failure detection system for bellows |
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• Stuffing box with
multiple lip seals for undemanding applications Standard dimensions of PRESSOFILTRO® -
Other sizes on request |
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