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Method for Achieving High Quality Color Prints

IP.com Disclosure Number: IPCOM000035090D
Original Publication Date: 1989-Jun-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Pennington, KS: AUTHOR

Abstract

A method for making high quality color prints is disclosed and basically comprises: providing a hydrophilic plate; magnetizing the plate in an imagewise fashion; depositing magnetic toner contained in a hydrophobic binder on the magnetized plate, thereby providing a lithographic-type master; supplying lithographic ink to the toned plate; and transferring only the ink to a blanket and then to a paper. The provided method overcomes the previous difficulty in magnetographic printing of obtaining colored prints. Previously, transparent dyes could not be used in magnetographic printing due to the fact that the magnetic toner particles were transferred to the paper, and these particles were either black or dirty brown in color.

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Method for Achieving High Quality Color Prints

A method for making high quality color prints is disclosed and basically comprises: providing a hydrophilic plate; magnetizing the plate in an imagewise fashion; depositing magnetic toner contained in a hydrophobic binder on the magnetized plate, thereby providing a lithographic-type master; supplying lithographic ink to the toned plate; and transferring only the ink to a blanket and then to a paper. The provided method overcomes the previous difficulty in magnetographic printing of obtaining colored prints. Previously, transparent dyes could not be used in magnetographic printing due to the fact that the magnetic toner particles were transferred to the paper, and these particles were either black or dirty brown in color. Thus, in order to provide colored magnetic toners, the magnetic particles had to be coated with pigments.

The method for achieving high quality color prints in essence combines magnetographic printing techniques with lithographic techniques. Thus, an aluminum plate or the like is prepared (cleaned) so that it is made hydrophilic. The plate is then magnetized in an imagewise manner as is known in the art of magnetographic printing. The plate is electronically erasable and rewritable. Magnetic toner may then be deposited on the magnetized plate. The toner is contained in a thermoplastic or polymeric binder which is hydrophobic. Thus, those areas where the toner is deposited (due to magnetic attraction...