Screen changers from Kreyenborg provide an effective method of filtering polymer melts. The removable ‘screen packs’ can be rapidly changed by the operator (typically in under 5 minutes) without having to unfasten any nuts and bolts. A screen pack with
the desired filtration level is fitted into the housing within a ‘screen bearing piston’ .The screens can be changed even whilst production continues. With the 2 channel K-SWE model 2 screens are normally in the operating position.
When to change screens
The inlet pressure to the screen changer can be monitored.
A rise in pressure indicates that the screens are becoming blinded by contamination. Once the pressure has reached a predetermined limit an alarm can signal the need to change screens. The screen bearing piston is moved hydraulically out of the housing to the screen change position.
The operator simply removes the dirty screen pack and installs a new one (the old pack can be discarded as they are inexpensive)