Gneuss: Melt Filtration Systems for highly corrosive materials

Thanks to their better mechanical and insulating properties, XPS insulation boards are used increasingly in the building industry as a replacement for EPS boards. However in contrast to other foam processes, there is in this case the issue of corrosion caused by the flame retardants, which places specific requirements on the design of the screen changers.

The XPS boards are usually manufactured on an extrusion line with two extruders in cascade orientation. The first or primary extruder principally plasticises the material and disperses additives and the blowing agent whilst the secondary extruder cools the material efficiently. In this configuration, the location of the melt filtration system in the transfer section between the primary and secondary extruders has been found to be best suited for this application.

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With SFXmagnus (Foto) and RSFgenius Gneuß Kunststofftechnik GmbH (www.gneuss.com) can now offer two melt filtration systems, which ensure the removal of foreign particles from the melt, with their pressure and process constant operation and without negatively influencing the sensitive foam extrusion process. Additionally, the RSFgenius ensures a time span between screen changes of several months, (even on highly contaminated material) thanks to its integrated self–cleaning system.

These systems are now equipped with long term corrosion protection thanks to a special anti corrosion treatment of the steel used for the manufacture of the screen changers. In this way, all the advantages of the Rotary Filtration Systems are available for the building industry suppliers, even where highly corrosive materials are processed.

Gneuß Kunststofftechnik GmbH, Bad Oeynhausen, Germany

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