Screen Changer
The continuous double-piston screen changer with
integrated backflush system fully automatically cleans
the four screen surfaces sitting on the piston once a
specific pressure on the screen units has been reached.
As a result of the integrated design, the piston is only
moved slightly and thus reduces wear and tear between
block and piston. Once a piston is in the backflush position,
the screen unit is flushed against the direction of the melt flow and
the impurities are discharged though a discharge channel.

Melt loss is reduced to a minimum
by ergonomic design of the backflush process.
The second piston continues to remain in the production
position and ensure unobstructed flow of the melt, so that
the pressure fluctuations at the outlet are kept at a low
level. After completing the backflush process in the first
piston, the same process is performed in the second piston.



Extruder output

Sieve ø

Screening area

KSF150 KSF150R max. 200 kg/h 4x70 mm 154 cm²
KSF200 KSF200R max. 400 kg/h 4x82 mm 211 cm²
KSF350 KSF350R max. 750 kg/h 4x104 mm 340 cm²
KSF600 KSF600R max. 1500 kg/h 4x134 mm 564 cm²
KSF750 KSF750R max. 2000 kg/h 4x155 mm 750 cm²
KSF910 KSF910R max. 2500 kg/h 4x170 mm 907 cm²
KSF1200 KSF1200R max. 3500 kg/h 4x200 mm 1256 cm²
KSF350.DOUBLE KSF350R.DOUBLE max. 1500 kg/h 8x104 mm 680 cm²
KSF600.DOUBLE KSF600R.DOUBLE max. 3000 kg/h 8x134 mm 1128 cm²
KSF910.DOUBLE KSF910R.DOUBLE max. 5000 kg/h 8x170 mm 1814 cm²



  • Four filter surfaces in use, leading to compact overall size
  • No direct flow against filter surfaces, ensuring even pressure
    distribution on the screen surfaces
  • Easy cleaning and maintenance
  • Low pressures by generous dimensioning of open filter surface
  • Integrated backflush system in the filter block and piston
  • Short travel during backflush process, thus lowest possible wear and
    tear of block and piston
  • Simple and secure locking of the perforated backflush plates
  • Low loss of material by optimized flow design of the backflush channels