Abstract:
A process of producing a relief image printing plate, the process comprising the steps of providing a photosensitive printing element, quenching dissolved oxygen in the photosensitive resin layer by pre-exposing the photosensitive layer to one or more sources of actinic radiation, wherein the range of wavelengths spanned by the one or more sources of actinic radiation differs by no more than about 20 nm, and imagewise exposing the photosensitive resin layer to actinic radiation to crosslink and cure the photosensitive resin layer. The photosensitive composition typically comprises at least one photoinitiator that is present in the photosensitive composition in an amount sufficient to provide an optical density in the photosensitive composition of between about 0.05 and 0.43 at a wavelength used to pre-expose the photosensitive composition.
Abstract translation:制备浮雕图像印刷版的方法,所述方法包括以下步骤:提供光敏印刷元件,通过将所述光敏层预曝光于一个或多个光源来淬灭所述光敏树脂层中的溶解氧 其中由所述一种或多种光化辐射源跨越的波长范围相差不超过约20nm,并且将所述光敏树脂层成像曝光于光化辐射以交联和固化所述光敏树脂层。 该光敏组合物典型地包含至少一种光敏引发剂,其存在于光敏组合物中的量足以在用于预曝光光敏组合物的波长下在光敏组合物中提供约0.05至0.43之间的光密度。 p >
Abstract:
A method of tailoring the shape of a plurality of relief printing dots created in a photosensitive printing blank during a platemaking process is provided. The photocurable layer is exposed to actinic radiation using an array of UV LED light assemblies and the use of the array of UV LED light assemblies produces relief printing dots having at least one geometric characteristic selected from the group consisting of a desired planarity of a top surface of the relief printing dots, a desired shoulder angle of the relief printing dots and a desired edge sharpness of the relief printing dots.
Abstract:
A method of making a relief printing element in a liquid photopolymer platemaking process is described. The method comprises the steps of: (a) selectively exposing the liquid photopolymer to actinic radiation through a negative to crosslink and cure portions of the liquid photopolymer; and (b) reclaiming uncured portions of the liquid photopolymer to be reused in the platemaking process. The step of reclaiming uncured portions of the liquid photopolymer comprises (i) heating the printing element to decrease the viscosity of the uncured liquid photopolymer; and (ii) removing uncured liquid photopolymer from the surface of the relief image printing element so that recovery of uncured liquid photopolymer from the surface of the relief image printing element is enhanced.
Abstract:
A photocurable relief image printing element is provided. The relief image printing element comprises at least a backing layer and at least one photocurable layer on the backing layer, The photocurable layer comprises at least one binder, at least one ethylenically unsaturated monomer, at least one photoinitiator, and an effective amount of a syndiotactic 1,2-polybutadine. The presence of the syndiotactic 1,2-polybutadiene results in a photocurable layer that exhibits minimal cold flow and good storage stability.
Abstract:
A method of making a relief image printing element from a photosensitive printing blank is provided. The method comprising the steps of: 1) providing a photosensitive printing blank comprising a backing layer, at least one layer of photoresin on top of the backing layer and a removable coversheet on top of the at least one layer of photoresin; 2) imaging the photosensitive printing blank through the removable coversheet using a laser to create a relief image therein; and 3) removing the removable coversheet.
Abstract:
A method of producing a relief image from a liquid photopolymerizable resin, said method comprising the steps of; a) placing a coverfilm onto an exposure glass; b) casting a liquid photopolymerizable resin layer onto the coverfilm; c) laminating a substrate to a backside of the liquid photopolymerizable resin layer as the liquid photopolymerizable resin layer is being cast onto the coverfilm; d) placing an image or film negative on top of the substrate; and e) exposing the liquid photopolymerizable resin layer through the image or film negative from the backside of the liquid photopolymerizable resin layer to selectively crosslink and cure the photopolymerizable resin layer and form a cured relief image, wherein said depth of the cured relief image is less than the height of the cast liquid photopolymerizable resin.
Abstract:
L'invention concerne un dispositif pour la réalisation d'une plaque d'impression comprenant un support (1) destiné à recevoir un photopolymère liquide puis un film destiné à constituer la base de la plaque d'impression, un moyen d'application (3) du photopolymère liquide sur le support (1) en une couche (2) ayant une épaisseur prédéterminée et un moyen de vérification (5) de l'épaisseur réelle de la couche (2) appliquée. Le moyen de vérification comprend un détecteur (5) monté sur le côté aval du moyen d'application (3) de manière à être disposé au-dessus d'une partie de la couche de photopolymère (2) venant d'être appliquée, le détecteur (5) engendrant un signal électrique sur la base duquel le débit de photopolymère est ajusté, lorsque l'épaisseur réelle de la couche (2) appliquée diffère de l'épaisseur prédéterminée. L'invention concerne également un procédé de réalisation d'une plaque d'impression, mise en oeuvre de préférence par ledit dispositif.
Abstract:
An improved flexo processor and a method of using the improved flexo processor to increase the flexibility of both the type and the size of the flexographic printing element that may be processed. The novel thermal plate processor system is capable of processing both flat and round photosensitive printing elements with only minimal changes to the system. The thermal plate processor system may also include means for exposure and post-exposure/detack in the same system.
Abstract:
A relief image printing element with an integral imageable printing surface and a method of preparing the relief image printing element are described. The relief image printing element comprises a dimensionally stable base layer; a floor layer comprised of a cured polymer selected from the group consisting of photopolymers, and polymers with a resilience of at least 40% when cured; and at least one layer of an imageable material. Most preferably, the floor layer created by curing the layer through the top of the printing element by face exposure. The printing element may also contain a compressible layer between the base layer and the floor layer.
Abstract:
A process of producing a relief image printing plate, the process comprising the steps of providing a photosensitive printing element, quenching dissolved oxygen in the photosensitive resin layer by pre-exposing the photosensitive layer to one or more sources of actinic radiation, wherein the range of wavelengths spanned by the one or more sources of actinic radiation differs by no more than about 20 nm, and imagewise exposing the photosensitive resin layer to actinic radiation to crosslink and cure the photosensitive resin layer. The photosensitive composition typically comprises at least one photoinitiator that is present in the photosensitive composition in an amount sufficient to provide an optical density in the photosensitive composition of between about 0.05 and 0.43 at a wavelength used to pre-expose the photosensitive composition.