In a recent test series performed in its test lab, the supplier of compounding and extrusion systems, Coperion GmbH, Stuttgart/Germany, together with the technology licensor Lummus Novolen Technology GmbH, Mannheim/Germany, demonstrated the wide range of possible applications for the proven Coperion ZSK twin screw extruder series.
Within the scope of tests, various polypropylene (PP) pellets with extremely low melt viscosities were successfully produced. This so-called meltblown PP forms the raw material for the production of nonwovens, which are mainly used as filter media in medical protective masks. The results obtained now allow the concept to be easily transferred from laboratory to production scale. Thus, the production of such products on existing and new large-scale extruders becomes possible.
The tests are based on the ZSK extruder technology with ZS-EG side devolatilization and a screw design. The combination of a new screw concept for optimum dispersion and very good degassing thanks to ZS-EG technology secures high product qualities. This is achieved with very good process reliability independent of throughput rates and melt viscosity.