FILTER DRYERS


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. Vacuum drying of the product  whereby all
Efficient cake washing, including reslurrying.   processes are  performed in one machine.
The machines are designed and built as per cGMP and FDA guidelines.
The machines are suitable for the processing of a wide variety of products and have been optimized for frequent changes in production as well as for sterile operations.
A glass-lined version is available for highly corrosive products.
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.

Performing all operations in an enclosed system assures constant product quality, simple validation as well as the required operational safety and environmental soundness.
 
 
The 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 .
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.
 
 
 
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.
 
 
Filter elements as specified to meet material and porosity requirements
 
    - Cloth (cotton, polypropylene, etc.) .
  - Single layer metal Filter mesh inserts .
  - Sintered plates .
  - Multi layer 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.
Stuffing box with multiple lip seals for undemanding applications .
Solids discharge valve for wet or dry product. Sealing metal to metal or conventional, activation by hydraulic cylinder, electric or hydraulic motor.
 
Valve seat cleaning by blow-off with nitrogen.
CIP and / or steam sterilization available.
Vapour Filter, equipped with automatic Filter back-cleaning system.
Sample valve.
Machine controls manual, or with PLC, PC and DCS.
Hydraulic pre-piping and electric pre-wiring of machine and hydraulic unit
Hydraulic unit for the agitator and for auxiliary functions such as raising and lowering of base, activation of the bayonet system etc.
 
Design and manufacturing to the requirements of international organizations such as ASME, TÜV, etc.
 
Environmentally sound and safe to operate.
   
 
Standard dimensions of PRESSOFILTRO®   - Other sizes on request. PF Closed type  and   PF Openable type 
 
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