Abstract: The invention relates to a method for monitoring a performance of a jetting device, the jetting device being configured to expel droplets of an electrically conductive fluid wherein at least a part of the conductive fluid is positioned in a magnetic field, the method comprising providing an electrical actuation current in the part of the conductive fluid positioned in the magnetic field, thereby generating a pressure wave in the conductive fluid; characterized in that the method further comprises detecting a resulting electrical current, which electrical current is induced by a residual pressure wave in the part of the conductive fluid positioned in the magnetic field, thereby obtaining a detection signal and based on the detection signal determining whether the jetting device is in an operative state. The invention further relates to a printing device, employing the described method.

Abstract: In a jetting device for ejecting droplets of a relatively hot fluid, a fluid chamber body is made of a heat resistant material and an inner surface of the fluid chamber body, the inner surface defining a fluid chamber of the jetting device, is wettable by the fluid. This configuration provides that no additional force needs to be applied for forcing the fluid into an orifice, i.e. a narrow tube leading towards a nozzle.

Abstract: The invention relates to a method for monitoring a performance of a jetting device, the jetting device being configured to expel droplets of an electrically conductive fluid wherein at least a part of the conductive fluid is positioned in a magnetic field, the method comprising providing an electrical actuation current in the part of the conductive fluid positioned in the magnetic field, thereby generating a pressure wave in the conductive fluid; characterized in that the method further comprises detecting a resulting electrical current, which electrical current is induced by a residual pressure wave in the part of the conductive fluid positioned in the magnetic field, thereby obtaining a detection signal and based on the detection signal determining whether the jetting device is in an operative state. The invention further relates to a printing device, employing the described method.

Abstract: An orifice plate for an ink jet print-head for ejecting drops of an ink, wherein the orifice plate includes an outer surface, which has a wettability with the ink, and at least one orifice arranged in the outer surface, said 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, wherein the wettability of the outer surface is poor near the edge of the at least one orifice and the wettability increases with increasing distance from the edge of the orifice, the increasing wettability with the increasing distance from the edge of the orifice providing a driving force for moving residual ink drops away from the edge towards a wettable region, thereby reducing the risk of disturbing the trajectories of subsequent ejected ink drops.

Abstract: In a jetting device for ejecting droplets of a relatively hot fluid, a fluid chamber body is made of a heat resistant material and an inner surface of the fluid chamber body, the inner surface defining a fluid chamber of the jetting device, is wettable by the fluid. This configuration provides that no additional force needs to be applied for forcing the fluid into an orifice, i.e. a narrow tube leading towards a nozzle.

Abstract: An orifice plate for an ink jet print-head for ejecting drops of an ink, wherein the orifice plate includes an outer surface, which has a wettability with the ink, and at least one orifice arranged in the outer surface, said 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, wherein the wettability of the outer surface is poor near the edge of the at least one orifice and the wettability increases with increasing distance from the edge of the orifice, the increasing wettability with the increasing distance from the edge of the orifice providing a driving force for moving residual ink drops away from the edge towards a wettable region, thereby reducing the risk of disturbing the trajectories of subsequent ejected ink drops.