Textile Technology section
Oerlikon: electro-charging unit rounds off filter nonwovens systems
Spunbond and meltblown materials can be electrostatically charged to improve their filter performance. The ecuTEC+ electro-charging unit from the Nonwoven BU of the Manmade Fibers segment of Oerlikon Management AG, Pfäffikon/Switzerland, is part of the delivery scope of all meltblown systems currently sold for the manufacture of protective mask nonwovens.
The patented solution is characterized by its high flexibility: ecuTEC+ stands out above all as a result of its diverse applications, which can be electro-charged. Nonwovens manufacturers can freely choose between numerous variation options and set the optimal charging method and intensity for their specific filter applications. Additionally, EPA and HEPA-class filter media can also be manufactured using the ecuTEC+.
This meltblown technology, with which among other things nonwovens for respiratory masks can also be manufactured, is recognized as being a technically very efficient method for producing highly-separating filter media made from man-made fibers. The capacities for respiratory masks available in Europe to date are predominantly manufactured on Oerlikon Nonwoven systems.
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Coperion: high-performance concept for meltblown PP production
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.
dfv media group