EREMA Filter Systems for Thermoplastics - Extrusionauxiliary.com

Applications for Erema filter systems● Discontinuous filtrationDiscontinuous melt filters which interrupt the melt stream during screen changes are mainly used for applicationswith a low level of contamination. These systems are suitable for extruders that are easy to start up after each screenchange, or where regular short interruptions to production are necessary anyway (e.g. for pellitiser knife changes)and long screen changing intervals are normal.● Continuous filtration with partial area backflushing technologyContinuous Erema filter systems with fully automatic partial area backflushing are recommended for applications withhigher levels of contamination or complicated start-up procedures. The fully-automatic cleaning mechanism greatlyreduces operator involvement and prevents downtime and time consuming start-ups. They also boost cost-effectivenessby allowing higher proportions of recycled material to be processed without compromising the quality of the finalproduct. An additional advantage is the comparatively large active area of the Erema RTF-type filters which can evenprevent peaks in contamination from interrupting the process. Due to the gentle filtration with low viscosities andconsequently low shearing of the melt at the screens, resulting from the large total active screen area of the EremaRTF-filters, also gels (depending on application), besides solid contamination, can be held back.Which filter system for which application?ensured(pressure constant)Continuousribbon filterScreen discScreen discwithbackflushLaserfilterSeparatorheads100%Pressure constant productionnot ensured(considerable pressure fluctuations)lowPivot discsingle pistonscreenchangerslide platescreenchangerdual pistonscreenchangerdual pistonscreenchanger withbackflushRTF-2...RTF-4 ...Degree of contamination of filtrated meltRTF-8 ...Discontinuousribbon filterhigh50%(Virgin)(Post consumer)The diagram shows schematically applications for different conventional filter systems being available on themarket with reference to the two main parameters process constancy (system ability to maintain pressureconstant filtration) and filtration capacity of system (capability to deal with contamination in the melt).HIGH TECH RECYCLING