Lithographic printing method using reusable aluminum carrier

【Patent Type】 Invention Patent 【Patent Name】 Method for lithographic printing with reusable aluminum carrier 【Applicant】 Agfa-Gruff Corporation [Inventor] E. Fei Xulun; J. Femers [Address of the main applicant] Mötzel, Belgium [application number] 200310102609.1
【 Application Date 】 2003.10.24
[Verification notice number] 1608844
【 Validation announcement date 】 2005.04.27
【 Main classification number 】 B41C1/10
[Category] B41C1/10 B41N3/00
Sovereign Items 1. A method of lithographic printing, comprising the steps of: (a) providing a lithographic support having a hydrophilic surface; (b) applying a thermoplastic containing hydrophobicity on a hydrophilic surface An image recording layer of polymer particles; (c) imagewise exposure of the image recording layer under heat or light to induce coalescence of the thermoplastic polymer particles of the exposed region of hydrophobic water; (d) developing the image recording layer to obtain a printing master with a lithographic image; (e) preparing a large number of printed copies by supplying ink to the lithographic image of the original printing and transferring the ink from the original to a paper; (f) recovering the lithographic support by removing the lithographic image; (g) using the recovered lithographic support in the next cycle including steps (a) to (e) and optionally including (f) and (g); the method is characterized in that the lithographic support is roughened For the anodized aluminum support, the hydrophilic surface of the support has a surface roughness of less than 0.45 [mu]m expressed as an arithmetic mean of the median roughness Ra, and the support surface contains more than 3.5 g/m<2 > alumina.
[Instructions CD-ROM] D0517
[Abstract] Disclosed is a printing method in which a surface-roughened and anodized aluminum carrier is coated with an image recording layer containing hydrophobic water-reduced thermoplastic polymer particles. The thus-obtained thermosensitive image forming material is then imagewise exposed and plated to obtain a material having a lithographic image comprising hydrophobic inked portions on a hydrophilic support for printing in a printing press Original. After the printing press is completed, the lithographic printing support is recovered by removing the inked portion of the hydrophobic water from the hydrophilic surface of the aluminum support. The recovered carrier is then reused for the next cycle of coating, exposure, platemaking and printing. By using a surface-roughened and anodized aluminum support having a hydrophilic surface, the operation cycle of the printing original plate has increased, and the hydrophilic surface has a surface of less than 0.45 μm expressed as an arithmetic mean value Ra of the median line roughness. Roughness.
【 Agency 】 China Patent Agent (Hong Kong) Co., Ltd. [Proxy] Guan Lixin; Wang Qichen