If you have to filter Extruded polymer and you do not want to stop the process for cleaning, try the Kleen-Screen® FROM WELDING ENGINEERS LTD.
Contaminants removed from extruder screens during continuous operation.
Extruder can be started up or purged without passing material through screens or die.
Screens need to be changed only occasionally, and without interruption of the filtering process.
Screens can be inspected, or mesh changed, without interrupting extrusion operation
Screens "regeneration" possible by back-flush without interruption of the filtering process
HOW THE KLEEN-SCREEN WORKS FOR YOU
The Kleen-Screen is not a screen changer but an apparatus for cleaning extruder screens.
It can be applied, and profitably so, to every extrusion operation not involving extremely heat sensitive thermoplastics.
It totally eliminates loss of product due to screen changing. Simply turn a valve and clean your screens by back-flushing, without interrupting your extrusion operation.
Screens need to be changed only occasionally.
If you want to change your screen mesh for some reason, this can be done rapidly without interrupting your extrusion operation.
After an overnight stoppage, for example, you can purge your extruder of degraded material without passing it through the screens or through the die.
There are no more hold-up points in the Kleen-Screen than in many extrusion die designs.
The pressure drop caused by the Kleen-Screen is no greater than that caused by conventional screens.
The back-flushing operation lasts only a few seconds. Since only a slight percentage of material is diverted, the degree to which your extruder product will be off-gauge is in most cases negligible.
The Kleen-Screen valving system is carefully designed to eliminate all hazards of shutting off the flow and thereby damaging the extruder