Abstract: A grayscale inkjet printing method including the steps of: a) supplying a pigmented inkjet ink to a grayscale print head having nozzles with an outer nozzle surface area smaller than 500 ?m2 and having an acoustic resonance period ARP of not more than 5.5 ?s; and b) applying a voltage wave form for ejecting pigmented inkjet ink from a nozzle of the grayscale print head within one jetting cycle; wherein the pigmented inkjet ink has a viscosity of at least 3.8 mPa·s at jetting temperature and a shear rate of 1,000 s?1; wherein the voltage wave form for ejecting the largest ink droplet includes, in chronological order, a first ejecting pulse having an amplitude A1 and a second ejecting pulse having an amplitude A3 with the amplitude A1 complying with the relationship: 0.50×A3<A1<1.

Abstract: A high viscosity jetting method includes jetting a liquid by a through-flow piezoelectric printhead through a nozzle in a nozzle plate, wherein a section of a nozzle has a shape including an outer edge with a minimum covering circle, the maximum distance from the outer edge to the center of the minimum covering circle is greater than the minimum distance from the outer edge to the center from the minimum covering circle times 1.2, and the jetting viscosity of the liquid is at least 20 mPa·s.

Abstract: A high viscosity jetting method includes jetting a liquid by a through-flow piezoelectric printhead through a nozzle in a nozzle plate, wherein a section of a nozzle has a shape including an outer edge with a minimum covering circle, the maximum distance from the outer edge to the centre of the minimum covering circle is greater than the minimum distance from the outer edge to the centre from the minimum covering circle times 1.2, and the jetting viscosity of the liquid is at least 20 mPa·s.

Abstract: A high viscosity jetting method includes jetting a liquid by a valvejet printhead through a nozzle in a nozzle plate, wherein a section of a nozzle has a shape including an outer edge with a minimum covering circle, wherein the maximum distance from the outer edge to the centre of the minimum covering circle is greater than the minimum distance from the outer edge to the centre from the minimum covering circle times 1.2, and wherein the jetting viscosity of the liquid is at least 20 mPa·s.

Abstract: A method for inkjet varnishing a substrate includes the steps of jetting a micro-pattern of a varnish having a viscosity of less than 30 mPa·s at 45° C. and at a shear rate of 30 s?1 to a portion of the substrate by one or more printheads having nozzles with a nozzle diameter of no more than 30 ?m, and at least partially curing the micro-pattern within 500 milliseconds after jetting to provide a micro-roughness to the portion of the substrate.

Abstract: A method and an inkjet printing device for single pass printing on an ink-receiver having a surface includes a plurality of sets of nozzles for jetting N inks on the surface, wherein N is larger than or equal to one, the N inks including a first ink, and wherein the plurality of sets of nozzles includes a first and a second set of nozzles for jetting the first ink; the device further including a radiation curing device arranged to cure the first ink when jetted on the surface by the first set of nozzles, wherein the radiation curing device is positioned between the first set of nozzles and the second set of nozzles.

Abstract: A method for inkjet varnishing a substrate includes the steps of jetting a micro-pattern of a varnish having a viscosity of less than 30 mPa·s at 45° C. and at a shear rate of 30 s?1 to a portion of the substrate by one or more printheads having nozzles with a nozzle diameter of no more than 30 ?m, and at least partially curing the micro-pattern within 500 milliseconds after jetting to provide a micro-roughness to the portion of the substrate.

Abstract: A method and an inkjet printing device for single pass printing on an ink-receiver having a surface includes a plurality of sets of nozzles for jetting N inks on the surface, wherein N is larger than or equal to one, the N inks including a first ink, and wherein the plurality of sets of nozzles includes a first and a second set of nozzles for jetting the first ink; the device further including a radiation curing device arranged to cure the first ink when jetted on the surface by the first set of nozzles, wherein the radiation curing device is positioned between the first set of nozzles and the second set of nozzles.

Abstract: A combination of: a) an inkjet print head having a nozzle density of at least 600 dpi and nozzles with an outer nozzle diameter D smaller than 25?m; and b) a UV curable inkjet composition containing 0 to 10 wt % of one or more monofunctional monomers and at least A wt % of 2-(2-vinyloxyethoxy)ethyl acrylate, wherein both wt % are based on the total weight of the UV curable inkjet composition; and wherein A is defined by the formula 100 wt %?D×3.0 wt %/?m?A?100 wt %?D×1.0 wt %/?m.

Abstract: A single pass inkjet printing method includes the steps of: a) providing a radiation curable inkjet ink set containing at least a first and a second radiation curable inkjet ink having a dynamic surface tension of no more than 30 mN/m measured by maximum bubble pressure tensiometry at a surface age of 50 ms and at 25° C.; b) jetting a first radiation curable inkjet ink on an ink-jet ink-receiver moving at a printing speed of at least 35 m/min.; c) at least partially curing the first inkjet ink on the ink receiver within the range of 40 to 500 ms after the first inkjet ink landed on the ink receiver; d) jetting a second radiation curable inkjet ink on the at least partially cured first inkjet ink; and e) at least partially curing the second inkjet ink within the range of 40 to 500 ms after the second inkjet ink landed on the first inkjet ink.

Abstract: A single pass inkjet printing method includes the steps of: a) providing a radiation curable inkjet ink set containing at least a first and a second radiation curable inkjet ink having a dynamic surface tension of no more than 30 mN/m measured by maximum bubble pressure tensiometry at a surface age of 50 ms and at 25° C.; b) jetting a first radiation curable inkjet ink on an ink-jet ink-receiver moving at a printing speed of at least 35 m/min.; c) at least partially curing the first inkjet ink on the ink receiver within the range of 40 to 500 ms after the first inkjet ink landed on the ink receiver; d) jetting a second radiation curable inkjet ink on the at least partially cured first inkjet ink; and e) at least partially curing the second inkjet ink within the range of 40 to 500 ms after the second inkjet ink landed on the first inkjet ink.

Abstract: A combination of: a) an inkjet print head having a nozzle density of at least 600 dpi and nozzles with an outer nozzle diameter D smaller than 25 ?m; and b) a UV curable inkjet composition containing 0 to 10 wt % of one or more monofunctional monomers and at least A wt % of 2-(2-vinyloxyethoxy)ethyl acrylate, wherein both wt % are based on the total weight of the UV curable inkjet composition; and wherein A is defined by the formula 100 wt %?D×3.0 wt %/?m?A?100 wt %?D×1.0 wt %/?m.

Abstract: A label-printing process for obtaining a desired optical density and a desired color tone with a substantially light-insensitive elongated imaging material comprising: selecting an elongated imaging material, the selected elongated imaging material having a support and a thermosensitive element; supplying image data to a processing unit of a thermal printer including a printhead having energizable heating elements arranged in a column C; converting the image data which are not zero into at least one activation pulse per pixel to be printed; energizing the heating elements printing-line by printing-line adjacent to the selected substantially light-insensitive elongated imaging material thereby producing an image; transporting the imaging material past and adjacent to the printhead in a transport direction with a transport system; forming an image dot with a heat energy of 50 to 200 mJ/mm2 of heating element surface area; wherein the thermosensitive element contains a substantially light-insensitive orga

Abstract: A method and apparatus is provided for operating a direct electrostatic printer whereby no printer adjustments are required by the operator. The direct thermal printer includes a print head and a variable speed motor for reproducing images on an imaging element.

Abstract: A method for making an image by means of a direct thermal imaging element, comprising on a support a thermosensitive layer incorporating an organic silver salt and a reducing agent contained in said thermosensitive layer and/or in other optional layers. The imaging element is imagewise heated by means of a thermal head having energizable heating elements. The activation of the heating elements is executed duty cycled pulsewise with the steps of preheating each heating element for a preheating time such that a preheat temperature in the imaging element is reached, which is just below the conversion temperature; selecting a pulse duty cycle such that a maximal density on the imaging element will be reached at the end of the maximal writing time; retrieving from a memory for each individual pixel an individual writing time related to a desired density on the imaging element; and energizing the heating elements with the selected pulse duty cycle for a time related to the retrieved individual writing time.

Abstract: A method for making an image using a direct thermal imaging element, comprising on a support a thermosensitive layer incorporating an organic silver salt and a reducing agent contained in said thermosensitive layer and/or in other optional layers, said imaging element being imagewise heated by means of a thermal head having energisable heating elements, characterised in that the activation of the heating elements is executed line by line with a line duty cycle .DELTA. representing the ratio of activation time to total line time, such that the following equation is satisfiedP.ltoreq.P.sub.max 3.3 W/mm.sup.2 +(9.5 W/mm.sup.2 .times..DELTA.)wherein P.sub.max is the maximal value over all heating elements of the time averaged power density P dissipated by a heating element during a line time.