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Browse Prior Art Database

Erosion Master Negative

IP.com Disclosure Number: IPCOM000111473D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Cahill, JG: AUTHOR [+2]

Abstract

Offset masters for printing can be produced by electroerosion of metallized plastics. Resolution of 250-pel/inch to 1000-pel/inch or better can be demonstrated by this process. The master is generated directly from digitally coded information, with the capability of computer composition and merging text, images, etc., without requiring a hard copy original and an intermediate photographic step.

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Erosion Master Negative

      Offset masters for printing can be produced by electroerosion
of metallized plastics.  Resolution of 250-pel/inch to 1000-pel/inch
or better can be demonstrated by this process.  The master is
generated directly from digitally coded information, with the
capability of computer composition and merging text, images, etc.,
without requiring a hard copy original and an intermediate
photographic step.

      This technique is limited to only approximately 200-300 copies
because of the chemical and/or physical wear of the metallized
surface during the printing process.

      An additional problem of background lines and scratches is
caused by the stylus during the erosion process.

      These problems are solved by an improved process, including the
addition of a thin dielectric film to the surface of the metal.  This
allowed runs of 5000 to 10,000 copies from a single master plate.

      This process, in addition to being limited to 10,000 copies,
also exposes the original master to damage and wear during printing.
Set forth below is a process which enables the user to make an
unlimited number of master plates, avoids wear caused by roller
contact in the printing process, and provides a permanent original to
be filed for future use.

      Duplicate masters are made by using the Mylar* original as a
negative and exposing a standard commercial light-sensitive plate
through the original, thereby producing a copy capable o...