Innovative filter media made from single-layered bi-component spunbonded nonwovens

R. Taubner, L. Sinowzik *, STFI - Sächsisches Textilforschungsinstitut e.V., Germany

Successful spunbond processing of Polycarbonate was carried out by using know-how of the meltblown procedure. The bico-configurations “segmented pie” and “hollow pie” were used to produce bi-component spunbonded nonwovens. Beside Polycarbonate, Polypropylene was mainly used as bi-component polymer. Desired filament splitting was achieved by hydroentanglement. Fine and finest fibers were created with improved filter structure (gradient design). Polycarbonate ratio was used to bring high air permeability, separation efficiency, dust storage capacity and extended life cycle of filter elements.

Successful processing of five different Polycarbonate and five different Polypropylene grades were realized by using three different spinneret sizes and configurations (4982 h/m segmented pie + 6827 h/m segmented und hollow pie). Pre-bonding was executed by calandering followed by online and offline hydroentanglement. Electret charging was carried out both top side and bottom side - online and offline. For filter testing separation efficiency towards NaCl and SAE fine dust (car filter) was measured according to DIN EN 779 – (VDI 3926 - DIN ISO 11057). Split rates of 50 – 75% were achieved (depending on spinneret and bonding type). Very promising results were accomplished with two types of PP and two types of PC polymer grades...

Session: G7 - Special Filter Media
Day: 12 October 2016
Time: 09:00 - 10:15 h