Aluminum alloy support for lithographic printing plate and process for producing substrate for support
US6337136B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 28, 1999 |
| Grant date | Jan 8, 2002 |
| Priority date | — |
| Expiry date | Jul 28, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41N3/034
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention provides a support for a lithographic printing plate prepared by cold rolling a sheet while intermediate annealing is omitted to save energy and the number of the cold rolling steps are decreased to simplify the sheet production steps and to give a desired strength of the sheet, and by inhibiting precipitation of Si particles in the substrate to give extremely excellent resistance to ink staining in the nonimage areas during printing, and a process for producing a substrate therefore. The production process comprises homogenization heat-treating an aluminum alloy slab comprising 0.10 to 0.40 wt % of Fe, 0.03 to 0.15 wt % of Si, 0.004 to 0.03 wt % of Cu, and the balance of Al and unavoidable impurities, hot rolling the heat-treated slab, and cold-rolling the hot-rolled strip without intermediate annealing, the cold rolling including a final pass after which the sheet temperature becomes at least the recovery temperature of the sheet and the following rapid cooling, whereby an aluminum alloy substrate for a lithographic printing plate having a content of precipitated Si of up to 30 ppm and a tensile strength of from 145 to 180 MPa is produced. When the aluminum …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.