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US 10,124,571 B2Granted
Ablation-type lithographic printing members having improved exposure sensitivity and related methods
AssigneePresstek, Inc.
InventorsKevin Ray, Travis Softic
Life of this patent
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Abstract
Dry, ablation-type, nitrocellulose-containing lithographic printing members include dual adjacent imaging layers, both including an absorber and at least one containing a binder (which may include or consist essentially of a melamine resin). The absorber of the nitrocellulose-containing layer is a pigment and this layer contains no absorbing dye, while the absorber of the other imaging layer includes or consists essentially of a dye.
Claims23
A method of imaging a printing member, the method comprising the steps of:
- (a) providing a printing member comprising
- (i) a substrate having an oleophilic surface;
- (ii) first and second imaging layers disposed over the substrate, the first imaging layer comprising a binder and a near-IR absorber including a dye, the second imaging layer comprising a polymer and a near-IR absorber that does not include a dye;
- and
- (iii) disposed over the imaging layers, an oleophobic third layer;
- (b) exposing the printing member to imaging radiation in an imagewise pattern, the imaging radiation at least partially ablating the imaging layers where exposed;
- and
- (c) cleaning the printing member to remove the third layer and at least a portion of the imaging layers where the printing member received imaging radiation, thereby creating an imagewise pattern on the printing member.
5 more elements
A lithographic printing member comprising:
- (a) a substrate having an oleophilic surface;
- (b) first and second imaging layers disposed over the substrate, wherein (i) the first imaging layer comprises a binder and a near-IR absorber including a dye, (ii) the second imaging layer comprises a polymer and a near-IR absorber that does not include a dye, and (iii) the first and second imaging layers are at least partially ablatable by exposure to near-IR radiation at a fluence level no greater than 210 mJ/cm2;
- and
- (c) disposed over the imaging layers, an oleophobic third layer.
1 more element
Dependencies are inferred from the claim text.