Pneumapress filters

Heavy-duty, simple Automatic Pressure Filters designed to minimize operational and installed costs. Pneumapress filters provide the highest solids throughput per filter area combined with maximum equipment availability

Pneumapress Filters
  • Pneumapress Features
  • Filtration Process
  • Pneumapress Experience

Features and Benefits

Pneumapress® filters deliver:

  • Drier solids
  • Cleaner filtrate
  • Easier operation
  • Lower maintenance



  • Isolatable Filter Plates
  • Single-sided solids discharge
  • Fully automatic operation with programmable logic controller
  • Touchscreen operator interface
  • Individual filter cloth for each filter plate
  • Automatic cloth wash system for each filter cloth
  • One hydraulic cylinder
  • Cake thickness 5 mm - 200 mm (1/4" - 4")


  • Fast cycles - typically less than 5 min
  • High solids throughput per filter area
  • Small equipment footprint
  • No need for rubber membranes or diaphragms
  • High equipment availability
  • Versatility
  • High temperature resistance - up to 200oC (400oF)

Pneumapress Model 30-8

Model 30 Filter Top View

Process Description

STEP 1 - Filtration:
A chamber is formed by lowering the upper plate onto the filter belt.
Slurry is then pumped into the chamber.
Solids are collected as filtrate passes through the filter belt and out the lower plate.

Cake Wash Step may be added to efficiently wash the captured solids and remove soluble materials

from the final product. Solvents or reagents may be added to selectively extract materials or alter the captured solids.

STEP 2 - Squeeze:
Compressed air enters the top of the chamber and mechanically squeezes additional filtrate from the retained solids.

This dries the solids and forms the filter "cake."

Different gases may be used to dry the cake.

STEP 3 - Discharge:
The upper plate raises and the filter cake is discharged.
The filter belt is automatically washed during each cake discharge without additional cycle time.

Clean media is used for each filtration cycle.


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Process Diagram

Pneumapress Flow Diagram 

Multiple Plate Diagram

First developed in 1989, 45 operating installations worldwide

  • First single module filter installed in 1991
  • Eight single module filters installed between 1991 and 1996
  • Multi module filter introduced in 1995, installed in 1996
  • Ten multi module filters installed between 1995 and 2008 (several repeat clients)
  • Largest Pneumapress filters (80 m²) installed in 2008
  • Seven multi module filters commissioned in 2008-2009




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    Pneumapress Brochure
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    Pneumapress Application Data Sheet
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    Corn Wet Milling Brochure
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    Laboratory Testing Sample Requirements
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    Pneumapress Filter Specifications
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    Model 19 Specifications
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    Model 30 Specifications
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    Chemical Engineering Article
    Discusses the Pneumapress filters installed at Cal Energy

    Washing Away Bioprocessing Costs
    Discusses filtration of biomass slurry with Pneumapress filters


    Cost Effective Liquid Solids Separation for Platinum Concentrates
    Discusses Pneumapress technology applied to PGM concentrate dewatering

    Cost Effective Liquid-Solids Separation: A more Effective Dewatering Technology
    Discusses Pneumapress technology and presents 2 case studies