Presstek, Inc. Patent applications |
Patent application number | Title | Published |
20130233190 | LITHOGRAPHIC IMAGING AND PRINTING WITH POSITIVE-WORKING PHOTORESPONSIVE PRINTING MEMBERS - Imaging of positive-working, IR-sensitive printing plates that use a novolac resin as the major polymer component of the imaging layer takes place with greater post-exposure latitude. In various embodiments, the imaging layer includes one or more poly(vinyl phenol) polymers or copolymers combined with one or more vinyl phenol monomers. | 09-12-2013 |
20120115088 | DEVELOPMENT OF PRINTING MEMBERS HAVING POST-ANODICALLY TREATED SUBSTRATES - Gum solutions are formulated to develop a negative-working photopolymer imaging layer coated on an anodized aluminum substrate that has undergone a post-anodic sealing treatment with inorganic phosphate and inorganic fluoride. The gum solution contains at least one polycarboxylic acid—which may be a polymer—that beneficially desensitizes the surface after the unexposed photopolymer layer is removed. | 05-10-2012 |
20120097185 | PRESS CLEANING WITH LOW-VOC SOLVENT COMPOSITIONS - Low-VOC cleaning compositions effective in removing stubborn UV inks from printing-press components include at least one non-ionic surfactant selected from the group consisting of a sorbitan ester, an ethoxylated sorbitan ester, an ethoxylated castor oil, polyethylene glycol ester and an alcohol ethoxylate; and at least one carrier comprising or consisting essentially of at least one of (i) an organic solvent miscible therewith or (ii) D-limonene. The cleaning composition has a VOC limit less than 100 g/L. | 04-26-2012 |
20110287266 | ABLATION-TYPE LITHOGRAPHIC IMAGING WITH SILICONE ACRYLATE LAYERS - In ablation-type printing plates involving silicone acrylate top layers, curing at high oxygen levels not only substantially reduces or eliminates toning, but does not adversely affect plate durability or printing performance. | 11-24-2011 |
20110249250 | ABLATION-TYPE LITHOGRAPHIC IMAGING WITH ENHANCED DEBRIS REMOVAL - Sequentially subjecting an imaged ablation-type printing member having a silicone topmost layer to, first, a cleaning liquid that is not a solvent for silicone, followed by subjecting to a second cleaning liquid that is a silicone solvent, conditions the printing member for subsequent printing with high-solids inks. | 10-13-2011 |
20110188023 | LITHOGRAPHIC IMAGING AND PRINTING WITHOUT DEFECTS OF ELECTROSTATIC ORIGIN - Embodiments of the present invention involve three-layer printing members having a central layer that is non-conductive yet abalatable at commercially realistic fluence levels. In various embodiments, the central layer is polymeric with a dispersion of nonconductive carbon black particles therein at a loading level sufficient to provide at least partial layer ablatability and water compatibility of the resulting ablation debris. | 08-04-2011 |
20110065048 | LITHOGRAPHIC IMAGING AND PRINTING WITH PRINTING MEMBERS HAVING FUSIBLE POLYMERIC PARTICLES - Embodiments of the present invention involve printing members that utilize a particle-fusion imaging mechanism but avoid susceptibility to handling damage. In particular, printing plates in accordance with the invention may utilize two phases, and these may originate, during manufacture, as two particle systems. Both systems are initially dispersed in a single coating applied as a layer, or in multiple coatings applied as adjacent layers, on a substrate. The second particle system exhibits a glass-transition or thermal coalescing temperature well above room temperature and also above the temperature at which the coating is dried. The coalescing temperature of the first particle system is below the drying temperature. As a result, when the coating is dried, the first particle system coalesces and forms a binder that entrains the second particle system, which has not coalesced. The binder formed by the first particle system is preferably insoluble in aqueous liquids, but is swellable or softened by such liquids, whereas the binder formed by the second particle system is preferably insoluble in and not swellable by aqueous liquids. Aqueous insolubility allows the dried (and ready-to-image) coating to resist handling damage, while swellability facilitates development. | 03-17-2011 |
20110020750 | LITHOGRAPHIC IMAGING AND PRINTING WITH WET, POSITIVE-WORKING PRINTING MEMBERS - Embodiments of the present invention involve printing members that avoid ablation imaging mechanisms and, as a result, crosslinked topmost layers. Topmost layers as described herein exhibit good thermal stability and durability during printing, but can be cleaned (and thereby removed from unimaged areas) with water or aqueous cleaning fluids following imaging. It is found, in some embodiments, that the viability of certain topmost layers can be critically dependent on the nature of the underlying substrate, e.g., in terms of texture and/or surface volume. | 01-27-2011 |
20100239976 | LITHOGRAPHIC IMAGING WITH PRINTING MEMBERS HAVING METAL IMAGING BILAYERS - Printing members include very thin metal imaging bilayers that combine to trap and utilize imaging radiation and, due to their minimal thicknesses, ablate easily. The bilayer may include a first (bottommost) metal layer having a high extinction coefficient in the imaging wavelength range (e.g., 600-1200 nm) and, thereover, a second metal layer having a high transmittance and low emissivity for imaging radiation. | 09-23-2010 |
20090297983 | PRINTING MEMBERS HAVING PERMEABILITY-TRANSITION LAYERS AND RELATED METHODS - Affinity transitions from hydrophobic to hydrophilic states, rather than ablation mechanisms, facilitate the creation of an imagewise lithographic pattern on a printing plate. | 12-03-2009 |
20090123871 | LITHOGRAPHIC IMAGING WITH PRINTING MEMBERS HAVING HYDROPHILIC, SURFACTANT-CONTAINING TOP LAYERS - Printing members that include a topmost layer comprising a polymer and a silicone surfactant are durable and enable use of low imaging-power densities. The protective layer may contain an inorganic crosslinker. | 05-14-2009 |
20090078139 | MAGNETIC PLATE RETENTION - A magnetic plate retention system especially suitable for use in retaining a lithographic plate material to a conventional plate cylinder utilizes one or more magnetic retention devices each having a curved surface complementary to the cylinder. When disposed on the plate, the retention devices magnetically adhere the plate to the underlying cylinder. | 03-26-2009 |