Abstract:
The present invention relates to an assembly of a print head and a maintenance unit. The present invention further relates to a method for the use of an assembly of a print head and a maintenance unit.
Abstract:
An inkjet printing apparatus includes an inkjet print head arranged to be moveable in a direction of movement along a guiding assembly. The guiding assembly includes a support structure; a strip mounted on the support structure, the strip being substantially rigid and straight in a first direction substantially perpendicular to the direction of movement and mounted in such way that a straightness in the direction of movement is provided; and an air bearing system operatively coupled to the strip. The strip extends in a vertical plane, the vertical plane being substantially parallel to the direction of movement and being substantially parallel to the first direction. The air bearing system is configured to control a position of the inkjet print head in a horizontal plane relative to the strip during movement of the print head in the direction of movement, the horizontal plane being substantially perpendicular to the vertical plane. Employing such a strip and a suitable mounting method for mounting the strip on the support structure, it is enabled to select a cost-effective and/or light-weight support structure.
Abstract:
The invention comprises a method for forming a 3D object, wherein the method comprises the step of depositing a support structure. According to the invention, the support structure comprises an organic di-acid having a molecular weight of 300 g/mole or less. The invention further relates to an assembly of a 3D printed object and a support structure.
Abstract:
Disclosed is a hot melt ink composition containing a substantially non-aqueous carrier composition; at least one dye which comprises at least one salt of the anthrapyridone series; and an organic sulfonic acid compound. Also disclosed is a method of preparing the hot melt ink composition.
Abstract:
A hot melt ink composition includes a copolyester, the copolyester consisting essentially of a condensation product of a first type of monomer, a second type of monomer and a third type of monomer, wherein the first type of monomer comprises at least one monomer A selected from the group of polyhydroxyl alcohols comprising X hydroxyl functional groups, wherein X≧3, wherein the second type of monomer comprises at least one monomer B selected from the group of monomers being able to form an ester linkage with an alcohol and wherein the third type of monomer comprises at least one monomer C selected from the group of aromatic monocarboxylic acids. A method for preparing such copolyesters and a hot melt ink composition includes a mixture of such copolyesters.
Abstract:
An inkjet print head for expelling a droplet of a fluid through a nozzle orifice comprises a fluid channel for holding a channel amount of fluid, the fluid channel comprising a pressure chamber in fluid communication with the nozzle orifice and a piezo actuator. The piezo actuator comprises an active piezo stack, which stack comprises a first electrode, a second electrode, and a piezo-material layer arranged between the first and the second electrode, and the piezo actuator comprises a membrane having a first side and a second side, the second side being opposite to the first side. The active piezo stack is provided at the first side and the pressure chamber at the second side such that the membrane forms a flexible wall of the pressure chamber. The fluid channel, when holding the channel amount of fluid, has a fluid compliance and the piezo actuator has an actuator compliance. In accordance with the present invention, the actuator compliance is larger than the fluid channel compliance such to have a high energy coupling efficiency and consequently a low power dissipation.
Abstract:
A method is provided for compensating a failing nozzle in a printhead comprising a series of print elements with nozzles for operation in an inkjet printing process in which a colorant is applied for locally changing an optical density, thereby printing an image. The method comprises at least two compensation mechanisms, each providing a different amount of additional optical density in the environment of a missing dot in the printed image. A nozzle is recorded as a failing nozzle if the associated print element does not apply an ink dot within predetermined specifications. An environment density is determined in an environment of a missing dot associated with said failing nozzle. The environment density is compared with a predetermined threshold, and an appropriate compensation mechanism is selected from the at least two compensation mechanisms. The method is applied in an inkjet printing system for balancing under- and overcompensated optical density.
Abstract:
An image forming device includes at least one image forming element moving past an image forming station in which toner is deposited on a surface of the image forming element, which surface is facing the image forming station, said image forming element including a core layer forming a core of the image forming element and including a plurality of tracks comprising electrodes individually connected to corresponding drivers, and a semi-conducting top layer forming the surface of the image forming element, wherein the image forming element further includes an isolating layer in-between the core layer and the semi-conducting top layer, which isolating layer includes a plurality of pads each of which extends over at least one track in a non-overlapping manner, extends towards one underlying track as to form an interconnection with the one underlying track, and is filled with a conducting material in order to let each pad individually be activated by means of the driver of the underlying track in order to adhere toner on a location of the surface of the image forming element, which location corresponds to the underlying activated pad.
Abstract:
A droplet generating device includes a wafer with a recess that defines a pressure chamber, a flexible membrane bonded to the wafer so as to cover the recess and form a wall of the pressure chamber, and an actuator attached to the membrane for flexing the membrane to generate a pressure wave in a liquid in the pressure chamber, the pressure chamber having a first port connected to a liquid supply line, and a second port connecting the pressure chamber to a nozzle, at least one of the ports being arranged adjacent to the membrane, wherein the wafer forms at least one island portion that projects into the at least one of the ports, engages the membrane and divides the port into at least two separate passages, and wherein the at least one island portion is arranged to delimit a flexing part of the membrane on a side of the at least one of the ports.
Abstract:
The invention relates to an ink composition comprising a water-dispersed resin a water dispersible colorant and water and wherein the ink composition further comprises a co-solvent, wherein the co-solvent is selected from the group consisting of saccharides and co-solvents comprising a ring structure, wherein the ring structure comprises a 5-membered, a 6-membered or a 7-membered ring. Additionally, the ink composition comprises a cyclodextrin compound.The invention further relates to a method for preparing such ink compositions and to a method for applying an image onto a receiving medium using such ink composition.