Patent ID: 6170396
Filing Date: 2001-01-09
Classification: B41F,B41N

Abstract:
A printing method for performing lithographic printing in multiple colors by use of flexible press plates, said printing method comprising the steps of:providing a lithographic printing device;providing said lithographic printing device with plate cylinders, a plate cylinder being provided for each color of said multiple colors, to be printed;forming each of said plate cylinders with a series of protrusions on an outer peripheral surface of each plate cylinder;aligning said series of protrusions in a circumferential direction on each said plate cylinder;providing a plurality of press plates;forming each of said press plates with a series of engaging holes;aligning said series of engaging holes of one of said press plates in a printing direction such that said series of protrusions of a respective one of said plate cylinders is insertable into said series of engaging holes;attaching said one of said press plates to said respective one of said plate cylinders by engaging said protrusions of said one of said plate cylinders with said engaging holes of said one of said press plates; andcarrying out said printing,wherein said engaging holes forming step is conducted while a following equation is satisfied:2D.ltoreq.P.ltoreq.4.06.times.10.sup.3.times.D/Wwhere P defines at least one of a pitch of the series of engaging holes of said one of said press plates in said printing direction and a pitch of the series of protrusions of said one of said plate cylinders in said circumferential direction, D indicates a diameter of each one of said protrusions, and W denotes a width of said one of said press plates.