Patent ID: 8033645
Filing Date: 2011-10-11
Classification: B41J

Abstract:
1. An orifice plate for an ink jet print-head for ejecting drops of an ink, the orifice plate comprising: an outer surface, which has a wettability with the ink; and at least one orifice arranged in the outer surface, the orifice being configured for ejecting ink drops, each orifice having an edge, the edge defining a transition boundary between the orifice and the outer surface; the wettability of the outer surface being poor near the edge of the at least one orifice, wherein the wettability increases gradually with increasing distance from the edge of the at least one orifice wherein the outer surface near the edge of the at least one orifice contains low surface tension, the surface tension increasing with an increasing distance from the edge of the at least one orifice.