DMFDiscontinuous Piston Screen Changer

The discontinuously operating piston screen changers are used in production areas, where a short interruption of production for filter change is possible. They differ mainly in the shape of their housings.

The DMF-rd is a round case that is heated with ceramic heating bands. This filter is the most cost-effective filter version and is mainly used as a pre-filter for coarse contaminants, as a pump protection or used in reduced space conditions (co-extrusion).

The DMF-sq is suitable for higher temperatures (up to 350 ° C) and higher pressures (up to 500 bar) due to its square housing and is heated with heating cartridges.

Both types can be used for polyolefins, melt adhesives and for many engineering plastics too.

When a filter change is required, the screen carrier piston is hydraulically moved out of the housing which is activated by a hand valve, and will be returned to the housing after completed screen change. This requires a short break down in production.

BritAS Filter Screen diameter  [mm] Screen diameter [in]
Screen area [cm²] Screen area [sqin]
Output [kg/h] Output [lbs/h]
DMF-1/058-rd 58,3 2.3 26 4.0 20 – 55 44 -121
DMF-1/076-rd 76,3 3.0 45 7.0 40 – 90 88 – 198
DMF-1/096-rd 96,3 3.8 72 11.2 65 – 145 143 – 320
DMF-1/116-rd 116,3 4.6 106 16.4 95 – 215 209 – 474
DMF-1/125-rd 125,0 4.9 122 18.9 110 – 245 243 – 540
DMF-1/148-rd 148,3 5.8 172 26.7 155 – 345 342 – 761
DMF-1/058-sq 58,3 2.3 26 4.0 20 – 55 44 – 121
DMF-1/076-sq 76,3 3.0 45 7.0 40 – 90 88 – 198
DMF-1/096-sq 96,3 3.8 72 11.2 65 – 145 143 – 320
DMF-1/116-sq 116,3 4.6 106 16.4 95 – 215 209 – 474
DMF-1/125-sq 125,0 4.9 122 18.9 110 – 245 243 – 540
DMF-1/148-sq 148,3 5.8 172 26.7 155 – 345 342 – 761
DMF-1/176-sq 176,3 6.9 244 37.8 220 – 490 474 – 1080
DMF-1/200-sq 200,0 7.9 314 48.7 180 – 630 617 – 1389
DMF-1/230-sq 230,2 9.1 417 64.4 375 – 950 827 – 2095
DMF-1/250-sq 250 9.8 491 76.1 440 – 980 970 – 2160
DMF-1/300-sq 300 11.8 707 109.6 630 – 1420 1389 – 3130
DMF-1/340-sq 340 13.4 908 140.7 810 – 1820 1785 – 4010

The throughputs are essentially influenced by material, viscosity, filter fineness and degree of contamination.

Applications

  • Allrounder. Filtration of industrial and production waste
  • Products. Pipe, profile and film production
  • Versatile. For polyolefins, many engineering plastics and hotmelt adhesives

 

  • High temperature. Process temperatures up to 350°C
  • Flexible. Process pressures up to 350 bar
  • Variable. Used as prefilter or pump protection

Customer benefits

  • Optimized. Small footprint
  • Simple. In operation

 

  • Perfect. Leakage free function without additional sealing
  • Robust. In design

Options

  • Steam or fluid heated
  • One hydraulic to operate several screen changers
  • Round housing with ceramic heating bands DMF-rd

 

  • Square housing with heating cartridges DMF-sq
  • Vertical orientation