Abstract:
The present invention relates to image plate processors and in particular to developing stations within such processors. A method and apparatus for processing an image (12), comprises the step of passing the image plate (12) through a cooled developer bath (20), the developer (21) in the developer bath being cooled by a coolant in a one stage coolant process without the use of an indirect cooling medium. The invention also encompasses an image plate processor in which the developing station includes a cooled developer bath (20) in which the developer (21) is cooled by a coolant in a one stage coolant process without the use of an indirect cooling medium.
Abstract:
There is described a method of preparing a printing form which comprises coating on a lithographic support having a hydrophilic surface, a layer of a radiation sensitive ink, imaging the ink coating by digital means, then acting on the plate with aqueous dampening rollers to remove the unexposed areas of the ink coating to reveal the hydrophilic surface of the plate and to leave an ink image formed from the ink, which is oleophilic after exposure.
Abstract:
There is described a water-less lithographic plate precursor which comprises on an aluminium plate a light-sensitive composition which comprises a polymer with hydroxy functional groups, an acid generator which when light exposed yields an acid together with a silyl ether of general formula (I), where Rf is a fluoroaliphatic group having 3 to 10 carbon atoms, Y is oxygen, SO2, carbonyl or a direct link, X is N R4 where R4 is hydrogen or lower alkyl having up to six carbon atoms or is a direct link, each of R1, R2 and R3 are lower alkyl groups having up to six carbon atoms and R5 is a lower alkyl group having up to six carbon atoms.
Abstract translation:描述了一种无水平版印刷版原版,其在铝板上包括含有具有羟基官能团的聚合物的光敏组合物,当曝光时产生酸与通式(I)的甲硅烷基醚一起产生酸 ),其中Rf是具有3至10个碳原子的氟脂族基团,Y是氧,SO 2,羰基或直链,X是N R 4,其中R 4是氢或具有至多6个碳原子的低级烷基或者是直链, R 1,R 2和R 3各自为具有至多6个碳原子的低级烷基,R 5为具有至多6个碳原子的低级烷基。
Abstract:
A planographic printing member comprises a support provided with a hydrophilic layer which may be formed by application of a silicate solution in which particulate material is dispersed. The hydrophilic layer is treated with a modifying means which may comprise an acid, buffer formulation, colloidal suspension or a salt and especially comprises aluminium sulphate, in order to ensure that an image layer, provided over the hydrophilic layer, is able to change colour on exposure and be deleted using conventional means.
Abstract:
There is described coated on a lithographic base a complex of a developer-insoluble phenolic resin and a compound which forms a thermally frangible complex with the phenolic resin. This complex is less soluble in the developer solution than the uncomplexed phenolic resin. However when this complex is imagewise heated the complex breaks down so allowing the non-complexed phenolic resin to the dissolved in the developing solution. Thus the solubility differential between the heated areas of the phenolic resin and the unheated areas is increased when the phenolic resin is complexed. Preferably a laser-radiation absorbing material is also present on the lithographic base. A large number of compounds which form a thermally frangible complex with the phenolic resin have been located. Examples of such compounds are quinolinium compounds, benzothiazolium compounds, pyridinium compounds and imidazoline compounds.
Abstract:
There is described a positive working lithographic plate precursor comprising a support having a hydrophilic surface and a coating thereon comprising a positive working photosensitive composition and an aryl alkyl polysiloxane. Such precursors exhibit a reduced tendency to developer attack of the image obtained after image-wise exposure under aggressive development whilst significantly reducing any accompanying loss of sensitivity in less aggressive developers and development conditions.
Abstract:
A method of preparing a substrate for a planographic printing plate comprises contacting a support, for example of aluminium or plastics, with a liquid having a pH of 9 or greater and comprising a silicate solution, for example sodium silicate solution, in which particulate material, for example of alumina or titania, are dispersed. The liquid when cured produces a hydrophilic layer on the support. A substrate per se and a printing plate are also described.
Abstract:
The invention relates to an improved method of making a printing plate and an improved printing plate made in accordance with the method. The invention is applicable with particular advantage to the manufacture of plates for use in lithographic printing processes. The method includes the step of depositing upon a substrate (3) a surface layer of particulate material by a plasma spray technique in which the plasma is sprayed onto the substrate into a low pressure environment (1) at a pressure of less than 1.9984 x 10 Pa (150 torr).
Abstract:
The present invention relates to image plate processors and in particular to rinsing stations within such processors. Apparatus for rinsing image plates during processing, comprises a rinsing station (D) including means (50, 52) for supplying rinsing liquid to image plates (12) to assist in plate rinsing, in which the rinsing liquid is recirculated within the rinsing station (D) through a liquid tank (54) being an integral part of the rinsing station (D). The invention also encompasses an image plate processor in which the rinsing station includes a liquid tank through which rinsing liquid is recirculated.
Abstract:
The invention relates to an automatic machine for the reversal processing of lithographic printing plates which are required to be exposed overall after heating. The method and apparatus of the invention provide that the exposure be effected while the plates are being conveyed through water in a shallow bath.