Continuous Polymer Filtration Screen Changer in Blown Film Extrusion
When the bubble is lost in a blown film line due to a screen pack change on a conventional screen changer, a considerable amount of time and material is lost. By contrast process disruptions are eliminated with a HITECH™ screen changer: a 120’ long roll of filter screen is equivalent to several hundred screen packs lasting several months in around-the-clock operation.
- There are no hot breaker plates to handle or dirty screen packs to change. The screen moves imperceptibly slowly and continuously so as not to disturb the polymer flow, and the continuous motion of the screen automatically adjusts to correspond to the rate at which the screen is clogging.
- With the elimination of pressure fluctuations due to screen clogging, uniform gauge control is maintained indefinitely. The “bubble” will never collapse, and the frost line will not waiver, even over months of non-stop operation.
HITECH™ continuous belt type screen changers for polymer melt filtration are ideal for blown film extrusion applications. The 120’ belt of screen mesh automatically adjusts the rate of screen advancement so that uniform head pressure and melt temperatures are maintained indefinitely. The bubble will not collapse and the “frost line” will not waiver over months of non- stop operation. HITECH™ continuous ribbon screen changers are used on extruders from all the world’s leading blown film equipment manufactures. Whether a retrofit of existing blown film equipment or the purchase of a new blown film extrusion line, HITECH™ screen changers have been the leading solution for polymer melt filtration equipment for more than 50 years.