Method of making printing plates for offset printing

Details Method of making printing plates for offset printing Method of making printing plates for offset printing

1976-08-18

1977-08-23

Coughenour, Clyde I.

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

101456, 101467, G03F 702

Patent

active

040438155

ABSTRACT:
In a method of making a printing plate for use in offset printing, a positive transparency of the design to be printed is first prepared in such a way that when the sensitive layer thereof is observed the design thereon is seen as right side out. This positive transparency is then mounted on a support provided with registration marks, with the sensitive layer of the transparency turned outwardly, and any errors in the transparency are corrected. The mounting is then used to contact-print a negative transparency on which the design is seen inside out when its sensitive layer is observed. Finally the design is formed on the printing plate employing the negative transparency, after any necessary re-touching of the latter.

REFERENCES:
patent: 1155352 (1915-10-01), Grass
patent: 1225246 (1917-05-01), Hess
patent: 1300729 (1919-04-01), Huebner
patent: 1504782 (1924-08-01), Powrie
patent: 1577181 (1926-03-01), Crowe
patent: 2124680 (1938-07-01), Wilkinson
Elements of Photogravure, by Bennett; London, 1927; pp. 18-25.
Handbook of Lithography, by Cumming; London, 1932; pp. 276-279.
Practical Photo--Lithography, by Willy; London, 1932; pp. 130-161.
The Lithographers Manual, by Strauss; N.Y., N.Y.; pp. 5:57, 8:5-8:7, Waltwin Pub. Co.; vol. 1.

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