Abstract: An inkjet printing method includes the steps of a) providing a white inkjet ink and at least one color inkjet ink to an inkjet printer; and b) jetting the white inkjet ink at a higher temperature than the color inkjet ink onto an ink-receiver. The difference in jetting temperature between the white inkjet ink and the color inkjet ink is at least 5° C. Inkjet ink sets and inkjet printers are also disclosed.

Abstract: A polymerizable Type II photoinitiator according to Formula (I): wherein: A represents a Norrish Type II initiating group; L represents a divalent linking group positioning the Norrish Type II initiating group A and the CR2R3-group in a 1-5 to a 1-8 position wherein position 1 is defined as the first atom in the aromatic or alicyclic ring of A to which L is covalently bonded and the position 5 to 8 is defined as the carbon atom of the CR2R3-group to which L is covalently bonded, with the proviso that L does not contain an amine. Radiation curable compositions and inks include the multifunctional Type II photoinitiator.

Abstract: A heat-sensitive negative-working lithographic printing plate precursor includes on a grained and anodized aluminum support a coating including hydrophobic thermoplastic polymer particles, a hydrophilic binder, and an organic compound, wherein the organic compound includes at least one phosphonic acid group or at least one phosphoric acid group or a salt thereof.

Abstract: A method of preparing a lithographic printing plate in which no pre-heat step is used comprising the steps of:—providing a lithographic printing plate precursor comprising a support and a photopolymerizable image-recording layer, the image-recording layer comprising a monomer and a binder;—image-wise exposing the precursor in an exposure unit;—off press developing the exposed precursor with an aqueous solution in a processing unit; characterized in that the ratio of the total amount of monomer to the total amount of binder is at least 1 and the time lapse between exposing an image-area of the precursor and contacting the image-area with the aqueous solution is at least 1 minute.

Abstract: A digital printer is provided with an automated printing sheet transport system, operating in an intermittent manner of feeding a printing sheet to the digital printer, halting the transport to allow printing onto the printing sheet while the printing sheet is maintained in a fixed position, and removing the printed sheet from the digital printer after printing. The digital printer may be combined with a screen print station, both operating on top of a single printing sheet transport system, to form an integrated multifunctional and hybrid printing press.

Abstract: An inkjet printing method includes the steps of a) providing a first radiation curable composition curable by free radical polymerization or cationic polymerization; b) applying a layer of the first radiation curable composition on a substrate; c) curing the layer; d) jetting on the cured layer a second composition curable by a different polymerization than the first composition but selected from the group consisting of free radical polymerization and cationic polymerization; and e) curing the jetted second composition by a different polymerization than the first composition. The first composition includes a cationically polymerizable compound having at least one (meth)acrylate group present in the first curable composition in an amount of at least 25 wt % based upon the total weight of the first curable composition. An inkjet ink set may be used in the above inkjet printing method.

Abstract: A radiation curable inkjet printing method for producing printed flexible foils and plastic bags wherein a web-like polymeric substrate having a maximum value for Tan ? between 40° C. and 110° C. and a surface energy Ssub is printed upon using a single pass inkjet printer with a non-aqueous radiation curable inkjet liquid having a surface tension SLiq, wherein SLiq is smaller than Ssub by at least 4 mN/m, and curing the radiation curable liquid on the substrate at a surface temperature equal or higher than the temperature of the maximum value for Tan ? and smaller than the melting point of the polymeric recording medium. A single pass inkjet printer is also disclosed.

Abstract: A multifunctional Type II photoinitiator according to Formula (I): wherein X represents a structural moiety according to Formula (II): wherein: A represents a Norrish Type II initiating group; and L represents a divalent linking group positioning the Norrish Type II initiating group A and the CR2R3-group in a 1-5 to a 1-9 position wherein position 1 is defined as the first atom in the aromatic or alicyclic ring of A to which L is covalently bonded and the position 5 to 9 is defined as the carbon atom of the CR2R3-group to which L is covalently bonded, with the proviso that L does not contain an amine. Radiation curable compositions and inks include the multifunctional Type II photoinitiator.

Abstract: A liquid radiation curable composition for inkjet printing includes a photoinitiating system consisting of one or more diffusion hindered photoinitiators selected from the group consisting of non-polymeric di- or multifunctional initiators, oligomeric or polymeric initiators, and polymerizable initiators, and one or more polymerizable co-initiators, wherein at least one of the polymerizable co-initiators is a polymerizable aromatic tertiary amine. Inkjet inks, an inkjet printing process, and packaging materials may include the liquid radiation curable composition.

Abstract: A radiation curable composition comprising a curable compound, a photo-initiator and a co-initiator characterized in that said co-initiator is represented by Formula I, wherein MA is the residue of a mono- or oligofunctional Michael acceptor; L is a divalent linking group positioning the two tertiary amines in a 1-3 to 1-10 position, with the proviso that both amines are aliphatic; R1, R2 and R3 independently represent an optionally substituted alkyl group, an optionally substituted alkenyl group , an optionally substituted alkynyl group or an optionally substituted (hetero) alkaryl group; any two of R1, R2 and R3 may represent the necessary atoms to form a ring; any two of R1, R2 and R3 may represent the necessary atoms to form a ring with any of the atoms of the linking group L; n is an integer ranging from 1 to 6.

Abstract: A heat-sensitive lithographic printing plate precursor comprising on a grained and anodized aluminum support a compound which is capable of converting form a hydrophobic state to a hydrophilic state or vice versa upon exposure to heat, and is represented by the following formula: A-(L)n-B wherein L represents a linking group, n represents 0 or 1 and B represents a thermo-labile group; characterized in that the compound further comprises the group A which is a functional group capable of interacting with the surface of a grained and anodized aluminum support and is selected from the list consisting of a halosilanyl group, an alkoxysilanyl group, a phosphonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a salicylic acid group or a salt thereof, a boronic acid group or an ester or a salt thereof, an optionally substituted di or tri-hydroxyaryl group, an optionally substituted salicaldoxime group, an optionally substituted salicaldimine group, an optionally substituted hydroxyheteroa

Abstract: A heat-sensitive negative-working lithographic printing plate precursor comprising: a support having a hydrophilic surface or which is provided with a hydrophilic layer; and an image-recording layer comprising hydrophobic thermoplastic polymer particles and an infrared light absorbing dye; characterized in that: said image-recording layer further comprises a compound, said compound comprising an aromatic moiety and at least one acidic group or salt thereof and having a most bathochromic light absorption peak at a wavelength between 300 nm and 450 nm.

Abstract: A heat-sensitive positive-working lithographic printing plate precursor comprising (1) a support having a hydrophilic surface or which is provided with a hydrophilic layer, (2) a heat-sensitive coating, comprising an underlayer on said support and thereon an upperlayer, an IR absorbing agent in at least one of said underlayer and upperlayer, a phenolic resin in said upperlayer, and a first polymer in said underlayer, characterized in that said first polymer is an alkaline soluble polymer comprising a first sulfonamide containing monomeric unit having a specified structure according to formula I or formula II and a second amide containing monomeric unit having a specified structure according to formula III. The printing plates show an improved chemical resistance of the coating and a reduced undercutting of the image forming parts of the coating.

Abstract: An ink supply system for an industrial inkjet printer makes use of a least one buffer vessel wherein ink at low pressure is isolated and pressurized to a high pressure suited for feeding the ink to the printhead. A recirculation ink supply system using plural buffer vessels is suited for repressurizing the ink without the use of a pump. The system avoids generation of gas bubbles due to cavitation which are present in systems using a pump for repressurizing ink.

Abstract: An inkjet printing method includes in order the steps of: a) providing to an inkjet printer one or more colorless liquids and a white ink including a pigment with a refractive index greater than 1.60; b) mixing the white ink in a controlled amount with the one or more colorless liquids to form a white ink-mixture wherein the viscosity is reduced by at least 5 mPa·s by reference to the white ink when measuring the viscosity at 40° C. with a Brookfield DV-II+Pro at 12 rotations per minute; and c) printing the white ink-mixture with the inkjet printer onto an ink-receiver. Additionally, a color inkjet ink set includes the one or more colorless liquids and the white ink, and an inkjet printer for use in the inkjet printing method.

Abstract: A coating device for coating a peripheral surface of a sleeve body with a coating formulation includes a vertical support column for supporting a sleeve body in a vertical position coaxial with a coating axis, a carriage slideable along the vertical support column, and an annular coating stage attached to the carriage and moveable therewith for containing the coating formulation and for coating a layer of the coating formulation onto the peripheral surface of the sleeve body during a sliding movement of the carriage along the vertical support column. The coating device includes an irradiation stage that is arranged to be moveable with the annular coating stage and to provide radiation to at least partially cure the layer of coating formulation onto the peripheral surface so as to prevent flow off of the coating formulation.

Abstract: An inkjet printing method including, in order, the steps of: a) providing at least two or more color inkjet inks of the same color and color density but having a different composition to an inkjet printer; b) mixing the two or more color inkjet inks in a controlled amount; and c) printing the mixture of the two or more color inkjet inks with the inkjet printer onto an ink-receiver. An inkjet printer and an inkjet ink set include two or more color inkjet inks of the same color and color density but having a different composition.

Abstract: The invention deals with a method for replacing the colorant values of a raster image by a new set of colorant values that is for example optimized for a standardized printing process. According to the invention, a forward look up table is identified that transforms the colorant values in the raster image into color values. The color values in this look up table are separated into new colorant values to obtain a colorant to colorant interpolation look up table. This is done by using an inverse transformation that is based on the forward look up table using appropriate separation parameters for the standardized printing process. The method has the advantage that it enables to map pure colorant values in the original image back onto pure colorant values in the transformed image.

Abstract: A method of making a flexographic printing form precursor for laser engraving including the steps of (i) providing at least one layer of a curable composition on a substrate; (ii) curing the at least one layer; wherein the curable composition defining an outermost layer includes at least 0.5% by weight relative to the total weight of the composition of an organo-silicon compound including at least one polymerizable group; and a urethane (meth)acrylate oligomer having three or less polymerizable groups.

Abstract: A method of making a flexographic printing forme precursor for laser engraving including the steps of (i) providing at least one layer of a curable composition on a substrate; (ii) curing the at least one layer; wherein the curable composition defining an outermost layer includes at least 0.5% by weight relative to the total weight of the composition of an organo-silicon compound including at least one polymerizable group; and a urethane (meth)acrylate oligomer having three or less polymerizable groups.