Patent ID: 9375653
Filing Date: 2016-06-28
CPC Classification: B01D,G03G

Claim Text:
1. An apparatus for concentrating an ink composition, the apparatus comprising a rotatable drum comprising an aluminum core, which has a hard anodized surface covering, an electrode disposed adjacent the hard anodized surface covering, and a roller having a metal core with an outer surface layer comprising an elastomeric material, wherein, in the absence of any ink composition, the elastomeric material of the roller and the hard anodized surface covering of the rotatable drum are in contact, wherein the apparatus is configured to apply a potential to each of the electrode and the roller of −2800 V or less, and apply a potential to the rotatable drum −500 V or more, or to apply a potential to each of the electrode and the roller of 2800 V or more, and apply a potential to the rotatable drum 500 V or less, and to apply an electric field between the rotatable drum and the first electrode of 2000 V/mm or more.