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

Abstract: A method for making a lithographic printing plate support is disclosed comprising the steps of: (i) providing an aluminum support; (ii) treating said support in an aqueous solution; (iii) graining said treated support in an electrolyte solution by applying an alternating voltage thereby inducing a local current density J; characterized in that said local current density J at time t fulfills the following equation: J(t)?a+bQ(t) for t=o to t=tf and wherein Q(t) is the integrated value of the absolute value of the local current density at time t:(I)—a is equal to 5—b is equal to 10—and tf is the time necessary to obtain a value of Q(t) equal to 50 C/dm2.

Abstract: Disclosed is a method of making a lithographic printing plate which includes providing a lithographic printing plate precursor having a coating therein, image-wise exposing the coating, and developing the precursor. The coating includes (i) a contiguous photopolymerizable layer of a photopolymerizable composition or (ii) a contiguous intermediate layer with a photopolymerizable layer of a photopolymerizable composition thereon. The photopolymerizable composition includes a polymerizable compound, a polymerization initiator and a first polymer. The contiguous photopolymerizable layer or the contiguous intermediate layer also includes an adhesion promoting compound and a second polymer.

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, an infrared light absorbing dye and a dye; wherein said dye has a specified structure and a most bathochromic light absorption peak between 451 nm and 750 nm.

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 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: 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 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: 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 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 lithographic printing plate precursor comprising a support having a hydrophilic surface or which is provided with a hydrophilic layer, and a coating thereon, said coating comprising an IR absorbing agent and a polyvinylacetal binder, said polyvinylacetal comprising an acetal group having an acetal carbon atom substituted by a phenolic group, a naphtol group or an antracenol group, a second recurring unit comprising an acetal group having an acetal carbon atom substituted by an alkyl group having a hydrocarbon chain containing 1, 2 or 3 carbon atoms, and a third recurring unit comprising an acetal group having an acetal carbon atom substituted by an alkyl group having a hydrocarbon chain containing 1, 2 or 3 carbon atoms wherein the alkyl group of the acetal group of the third recurring unit is different from the alkyl group of the acetal group of the second recurring unit. The precursor exhibits an improved sensitivity on exposure and the stability against daylight exposure is further improved.

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 relief print master is created with a printhead that jets droplets of a polymerizable liquid on a cylindrical sleeve. The droplets follow a spiral path on the cylindrical sleeve. In a multiple printhead unit, there are different spiral paths associated with the constituting printheads in the multiple printhead unit. The distance between the spiral paths is not even. Preferred embodiments of the current invention provide a method and a system so that the distance between these spiral paths becomes even. The system can also be used for the creation of other types of print masters, such as offset print plates.

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: 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 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.