Gneuss’ Rotary Filters: constant pressure and process consistency

The Rotary Filters of the SFneos series are one of Gneuss’ patented rotary filtration systems and operate continuously, with constant process and pressure. They can be used for almost all applications and are characterized by their compact design as well as simple and safe handling. Several screens can be changed at the same time during a screen change process. Screen changes do not have any impact on the product quality.


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Rotary Filters of the SFneos series – specially designed for PVC processing and recycling

The Rotary Technology has been used successfully in PVC processing and PVC recycling applications for more than 30 years. The SFpvc Filtration Systems have been specially designed for thermally unstable and chemically aggressive processes such as those occurring in PVC recycling. The rheologically optimized filtration systems with their dead-zone free melt channel design and short flow path allow gentle processing.

The advantages of the SFneos Filtration System

  • Constant 
    By always keeping the size of the free active screen area constant, the pressure can be kept constant during the whole production process (max. pressure variations of ±1,5bar). Also, melt temperature and viscosity are permanently free from variations. Thus, the end product quality is always constant.
  • Quality
    Melt purity and quality downstream of the filtration system are permanently achieved. The flow channels are rheologically optimized.
  • Streamlined
    Due to the optimal rheological flow channel design, the dwell time of all the melt in the filtration system is very short (< 1 minute). No danger of material burning in dead spots.
  • Straightforward
    The operator is informed in time about upcoming screen changes by the control system. Changing screens is a simple and quick procedure and does not influence the process and product quality.
  • Compact size
    The compact design of the SFneos Rotary Filtration System enables simple and cost-efficient integration even in a very confined space. Due to the compact design and the high quality insulation, the energy consumption is extremely low.

Mode of operation: How the SFneos Rotary Filters work

When a pressure increase upstream of the Rotary Filter due to contamination is registered, the filter disk is indexed by means of a pneumatic drive. This guarantees that the free screen area is always kept constant and that the pressure variation in front of the filter is < 1.5 bar.

Design of SFneos Rotary Filters

The filter disk of the Rotary Filter – on which the screen cavities are located in a ring pattern – rotates between the two filter blocks. To change the screens, the safety cover has to be opened. The production process is not disturbed by the screen change procedure. Thanks to the modular design of this rotary filtration system, it is possible to replace the few wearing parts (such as heater elements and bearing bushings) during operation. Continuous production over many years is thus made possible.

Technical Data SFneosmetric units US units        
active screen area40 – 2.370 cm²6 – 367 in²               
max. pressure180 – 350 bar2,500 – 5,000 psi
heatingelectric or liquid electric or liquid
throughput200 – 11.100 kg/h440 – 24,500 lbs/h