Continuous Belt Feed Melt Filtration Screen Changer in Sheet & Film Extrusion
The only moving element in a HITECH™ screen changer is the 120’ roll of filter screen.
- The yield of such a roll is equivalent to several hundred “screen packs” in a conventional, slide-plate type screen changer, and a roll of screen lasts many months in non-stop operation.
- The 120’ roll of filter screen advances at a slow, incremental rate so as not to disturb the polymer flow. Process disruptions associated with screen movement are eliminated.
- The incremental rate of screen travel automatically adjusts to correspond to the rate at which the screen is clogging. Melt pressure and temperature fluctuations caused by screen clogging are eliminated, and, as a result, uniform gauge control is maintained indefinitely.
Hitech™ Belt Feed polymer melt filters seamlessly integrate with the continuous operation of sheet and film extrusion lines. Hitech™ screen changers have no hot breaker plates to handle or dirty screen packs to change. Instead, a 120’ roll of filtration media advances slowly and continuously to seamlessly blend with the operation of sheet and film extrusion lines.
Hitech™ screen changers have no external mechanism or hydraulics. Instead, the extruder head pressure is used to provide the force to advance the screen. The screen moves imperceptibly slowly and continuously, resulting in perfectly steady head pressure and melt temperatures for many months of unsurpassed gauge control.