Computer-to-cylinder type lithographic printing method and computer-to-cylinder type lithographic printing apparatus
US6470799B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2001 |
| Grant date | Oct 29, 2002 |
| Priority date | — |
| Expiry date | Mar 28, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2002/061
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of computer-to-cylinder lithographic printing, comprising: loading a plate material on a rotative plate cylinder of a lithographic printing apparatus; rotating the plate cylinder having loaded thereon the plate material; forming an image directly onto the plate material by an inkjet image-recording process which comprises ejecting an oil-based ink from a recording head having a plurality of ejecting channels, based on image data signals, utilizing an electrostatic field, to prepare a printing plate; subsequently performing lithographic printing with the thus prepared printing plate, wherein the recording head is driven so that every n'th channel thereof is actuated in a common phase, and wherein the plate cylinder is rotated to give a surface rotational speed V (mm/sec) of the plate material as represented by the following formula:V=25.4×(f×n)/Nwherein N represents a recording resolution (dots/25.4 mm) along a rotative direction of the plate cylinder on the plate material, and f represents a driving frequency f (Hz) of each ejecting channel of the recording head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.