Browse Prior Art Database

PROCESS FOR PREPARING PRINTING MASTERS

IP.com Disclosure Number: IPCOM000022916D
Original Publication Date: 1976-Apr-30
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 273K

Publishing Venue

Xerox Disclosure Journal

Abstract

In lithographic printing significant labor cost and make~ up time is expended in making masters. These masters may be paper, i.e. (xerographically imaged ZnO paper), metal (optically exposed and developed photoresist coated metal plates), or gravure (etched metal cylinders) . Paper masters are easiest to make and have the shortest life and lowest quality. Gravure rolls have the longest life and best quality but are very costly and time consuming to make,

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XEROX DISCLOSURE JOURNAL

PROCESS FOR PREPARING Proposed Classification

PRINTING IV1J~STERS U.S. Cl, 101/1
Robert N. Jones mt. Cl. 341f

In lithographic printing significant labor cost and make~

up time is expended in making masters. These masters may
be paper, i.e. (xerographically imaged ZnO paper), metal
(optically exposed and developed photoresist coated metal
plates), or gravure (etched metal cylinders) . Paper
masters are easiest to make and have the shortest life
and lowest quality. Gravure rolls have the longest life
and best quality but are very costly and time consuming
to make,

In accordance with this invention, high quality durable
masters are produced directly on the imaging cylinder of a
printing press. The system consists of a cylinder within
which there is a roll of a composite organic material which
exits through a slit opening, wraps around the cylinder and
re~enters the cylinder through a second opening to be wound
on a takeup roll, The composite organic material web can

be advanced repeatedly on demand to replace the material
'on the cylinder surface, This cylinder is the imaging
cylinder and the composite organic material forms the base
for the creation of a lithographic master, Employing a
laser writing system an image is burned on the surface of
the organic composite web to form the master. This may
be accomplished in several ways. The organic web may
consist of a base layer of a hydrophobic material over-~
coated with a thin layer of a hydrophilic material which
v...