Michael Loren Estes

US Patent:

44078625, Oct 4, 1983

Filed:

Oct 29, 1981

Appl. No.:

6/316386

Inventors:

Forrest Wessells - Deltona FL
Joseph Startari - Tallahasse FL
Michael E. Estes - Marietta GA

Assignee:

W. R. Grace & Co. - Cambridge MA

International Classification:

B41L 700
B41L 900

US Classification:

427144

Abstract:

A method of preparing a letterpress printing plate from a liquid photopolymer using an air knife to etch out the unpolymerized liquid to leave the relief image. A new printing plate substrate is used that has a laminae that is paper and a lamina that is a sealing coat on the paper. The paper is a special paper known as tag stock that is 5 to 20 mils thick, has tensile strengths of at least 30 pounds per inch in width in the press direction and at least 20 pounds per inch in width in the cross press direction, and fibers that are independently colored with a dark color having a good light absorption/reflectivity ratio.