摘要:
A method for treating a lithographic printing plate is dislosed comprising the step of applying a liquid to the plate including - an aqueous phase; - a solvent phase which is present in the liquid in an amount ≤ 40%wt; - and one or more compound(s) having the following formula I:
R 1 -O-(Y) n -H
wherein R 1 is a methyl group, an ethyl group, a propyl group or a butyl group; Y represents -CH 2 -CHR 2 -O- with R 2 = hydrogen or an alkyl group and/or mixtures thereof; and n is an integer ≥ 10.
摘要:
An output color profile, such as an ICC output profile, contains a look-up table to separate the color of a pixel, for example a CIELAB color, into a set of colorant values, for example CMYK colorants. In practice, most CMYK images have been separated using one of a limited set of standardized output profiles. The invention deals with the problem of guessing which one of these standardized output profiles has been used to separate a specific image. For this purpose the CMYK values of the image are analyzed. The analysis involves calculating a distance in the CMYK space between the CMYK values of an image, and the CMYK values produced by different output profiles. A profile is selected based on these distances, for example by selecting the profile yielding the shortest distance.
摘要:
A method of preparing a lithographic printing plate comprising the steps of: - providing a lithographic printing plate precursor comprising a photopolymerizable coating provided on a hydrophilic support; - image-wise exposing the precursor; - pre-heating the exposed precursor; - developing the exposed precursor in a gum solution;
characterized in that after pre-heating and before developing the precursor an accelerated cooling of the precursor is carried out and the cooling does not essentially remove a part of the coating of the precursor.
摘要:
A method for making a lithographic printing plate support including the steps of: - providing an aluminum support; - graining said support in a graining electrolyte solution; - treating the grained support in a desmut electrolyte solution containing hydrochloric acid by applying a direct current resulting in a charge density Q;
characterized in that the desmut electrolyte solution has a pH 2 .
摘要:
An ink jet printing method is disclosed wherein an ink jet print head and an ink jet ink are provided. The ink jet print head has an ink channel and electrically actuable means to eject a number of successive droplets (d1,d2). The method includes the steps of (i) applying a number of successive electrical drive signals to the electrically actuable means, each electrical drive signal for ejecting a corresponding droplet, each electrical drive signal inducing in the ink channel an underpressure pulse (51 2 ) followed by a pressure pulse (52 2 ) for ejecting the corresponding droplet and each electrical drive signal is unipolar and of the same polarity; (ii) after applying the last electrical drive signal for ejecting the last droplet of a maximum number of successive droplets, applying a electrical cancel signal for reducing residual acoustic pressure waves in the ink channel. The electrical cancel signal induces in the ink channel an underpressure pulse (51 c ),and a pressure pulse (52 c ), and at least one of the underpressure pulse or the pressure pulse is applied in antiresonance with the pressure pulse of the last electrical drive signal.
摘要:
A free radical curable liquid for inkjet printing of food packaging materials comprising no initiator or otherwise one or more initiators selected from the group consisting of non-polymeric di- or multifunctional initiators, oligomeric initiators, polymeric initiators and polymerizable initiators; wherein the polymerizable composition of said liquid consists essentially of: a) 25 - 100 wt% of one or more polymerizable compounds A having at least one acrylate group G1 and at least one second ethylenically unsaturated polymerizable functional group G2 selected from the group consisting of a vinlyether group, an allylether group and a allylester group; b) 0 - 55 wt% of one or more polymerizable compounds B selected from the group consisting of monofunctional acrylates and difunctional acrylates; and c) 0 - 55 wt% of one or more polymerizable compounds C selected from the group consisting of trifunctional acrylates, tetrafunctional acrylates, pentafunctional acrylates and hexafunctional acrylates, with the proviso that if the weight percentage of compounds B > 24 wt%, then the weight percentage of compounds C > 1 wt%;
and wherein all weight percentages of A, B and C are based upon the total weight of the polymerizable composition; and with the proviso that at least one polymerizable compound B or C is present in the polymerizable composition if the free radical curable liquid contains no initiator.
摘要:
A colour inkjet ink set comprising a white ink comprising a pigment with a refractive index greater than 1.60 and at least one colour inkjet ink characterized in that the viscosity of the white inkjet ink is at least 4 mPa.s greater than the viscosity of the colour inkjet ink wherein the viscosity is measured at 40°C with a Brookfield DV-II+Pro at 12 rotations per minute. Inkjet printing methods and inkjet printers are also disclosed.