Abstract

Dry, ablation-type, nitrocellulose-containing lithographic printing members (100) include dual adjacent imaging layers (104, 106), 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.

IPC Classes  ?

• B41C 1/10 - Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
• B41N 1/00 - Printing plates or foils; Materials therefor

Abstract

The blanket cylinder of a printing press is used to remove oleophobic debris from an imaged dry printing member. Following imaging— e.g., imagewise exposure of the printing member to radiation that ablates the layer below the oleophobic layer, or de- anchors it from the oleophobic layer without ablation— the printing member is brought into rolling contact with the blanket cylinder, and the press is operated "on impression." This rolling contact may remove not only the oleophobic top layer but ablation debris of the underlying imaging layer as well.

IPC Classes  ?

• B41C 1/10 - Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
• B41N 1/00 - Printing plates or foils; Materials therefor
• B41N 3/00 - Preparing for use or conserving printing surfaces

Abstract

Negative-working, IR-sensitive dry printing plates utilize an oleophobic topmost layer, a nitrocellulose-based imaging layer ablatable by laser discharge, and a grained metal substrate with no heat-insulating layer intervening between the imaging layer and the substrate.

IPC Classes  ?

• B41N 1/12 - Printing plates or foils; Materials therefor non-metallic other than stone
• B41C 1/10 - Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
• B41F 7/20 - Rotary lithographic machines - Details
• B41N 1/00 - Printing plates or foils; Materials therefor

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.

IPC Classes  ?

• B41C 1/10 - Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
• B41F 7/00 - Rotary lithographic machines
• B41M 1/08 - Dry printing
• B41N 1/00 - Printing plates or foils; Materials therefor

Abstract

The blanket cylinder of a printing press is used to remove oleophobic debris from an imaged dry printing member. Following imaging—e.g., imagewise exposure of the printing member to radiation that ablates the layer below the oleophobic layer, or de-anchors it from the oleophobic layer without ablation—the printing member is brought into rolling contact with the blanket cylinder, and the press is operated “on impression.” This rolling contact may remove not only the oleophobic top layer but ablation debris of the underlying imaging layer as well.

IPC Classes  ?

• B41F 7/00 - Rotary lithographic machines
• B41C 1/10 - Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
• B41N 1/00 - Printing plates or foils; Materials therefor
• B41M 1/08 - Dry printing

Goods & Services

Printing plates.

Goods & Services

Printing plates.

Abstract

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.

IPC Classes  ?

• G03F 7/00 - Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printed surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
• B41F 7/02 - Rotary lithographic machines for offset printing
• B41C 1/10 - Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
• C08J 7/18 - Chemical modification with polymerisable compounds using wave energy or particle radiation
• C09D 183/06 - Polysiloxanes containing silicon bound to oxygen-containing groups
• C08G 77/20 - Polysiloxanes containing silicon bound to unsaturated aliphatic groups

Abstract

A recording medium comprises an oleophilic substrate and, thereover, a topmost oleophobic layer comprising a cured polymeric silicone matrix that consists essentially of the addition-cure reaction product of a vinyl-functional polydialkylsiloxane and a silane cross-linking agent. The vinyl-functional polydialkylsiloxane has a molecular weight ranging from 30,000 to 75,000 or 110,000 to 130,000. If the molecular weight of the vinyl-functional polydialkylsiloxane is within the range of 30,000 to 75,000, the molar ratio of silane groups to vinyl groups is within the range of about 11:1 to about 25:1; and if the molecular weight of the vinyl-functional polydialkylsiloxane is within the range of 110,000 to 130,000, the molar ratio of silane groups to vinyl groups is from about 5:1 to about 27:1. The recording medium may be used as a lithographic printing plate.

IPC Classes  ?

• G03F 7/00 - Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printed surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
• C08L 83/04 - Polysiloxanes
• B41C 1/10 - Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
• B41N 1/00 - Printing plates or foils; Materials therefor
• C09D 183/04 - Polysiloxanes
• C08G 77/12 - Polysiloxanes containing silicon bound to hydrogen
• C08G 77/20 - Polysiloxanes containing silicon bound to unsaturated aliphatic groups

Abstract

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.

IPC Classes  ?

• B08B 7/00 - Cleaning by methods not provided for in a single other subclass or a single group in this subclass

Abstract

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.

IPC Classes  ?

• B41C 1/10 - Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
• B41N 3/00 - Preparing for use or conserving printing surfaces
• B41N 1/00 - Printing plates or foils; Materials therefor