Abstract:
An ink jetprinting device includes a pressure chamber formed by a plurality of wall segments, a first aperture extending through a wall segment and communicating with an ink jet orifice and a second aperture extending through a wall segment and communicating with an ink supply duct. The pressure chamber is arranged to contain an ink composition including a carrier composition and a composition including at least one functional component. The plurality of wall segments are at least partly coated with a coating layer of a coating compound having a stronger interaction with at least one component of the carrier composition relative to the composition including the at least one functional component. A method for manufacturing such an ink-jet printing device is disclosed.
Abstract:
An ink jet printing device includes a pressure chamber, a first actuator membrane being arranged to form a first flexible wall of the pressure chamber, a first piezo-electric part being operatively connected to a surface of the first actuator membrane, a second actuator membrane being arranged to form a second flexible wall of the pressure chamber and a second piezo-electric part being operatively connected to a surface of the second actuator membrane, wherein the second flexible wall is mechanically decoupled from the first flexible wall.
Abstract:
A coating provides a wetting gradient to an orifice surface, the coating having a local coverage that decreases with increasing distance from an orifice. A method is provided for applying a wetting gradient on an orifice surface. The wetting gradient is formed by providing a compound for forming a coating and locally bonding this compound to the orifice surface. A print head is provided with an orifice surface, wherein the orifice surface has a wetting gradient provided around an orifice using the method for applying a wetting gradient on an orifice surface.
Abstract:
A print head configured for ejecting droplets of ink comprises a nozzle surface having arranged thereon at least one nozzle and a pattern of wetting sections and anti-wetting sections, arranged around the nozzle. The wetting sections interchange on a circular line, concentric with the nozzle, with anti-wetting sections. The pattern of wetting sections and anti-wetting sections is configured such that it provides a driving force for droplets to move away from the nozzle. The invention further relates to a printing apparatus, comprising said nozzle.
Abstract:
A droplet ejection device comprising a flow passage, a nozzle orifice formed in a wall of the flow passage, a circulation system for circulating a liquid through the flow passage, and an actuator system for generating a pressure wave in the liquid in the flow passage, wherein an obstruction member is arranged in the flow passage in a position opposite to the nozzle orifice and projecting towards the nozzle orifice.