Method for forming plate characters in a half-tone gravure plate

Details Method for forming plate characters in a half-tone gravure plate Method for forming plate characters in a half-tone gravure plate

1990-02-08

1991-05-28

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making printing plates

430300, 101150, 101170, 1014011, G03F 7004

Patent

active

050194860

ABSTRACT:
A method for forming plate characters in a half-tone gravure platemaking process in which a laser beam intermittently irradiates a photosensitive material, thus forming plate characters therein as a result of exposure by the laser beam. The outline portion of each character is made up of continuous groove-form cells and inner portion of the character (the filled portion) is made up of independent dot-form cells corresponding to the dot percentage of a shadow portion or with island-form projections to the extent that ink flow (running) does not occur when the cells are filled with ink as a result of the plate surface being wiped by a doctor blade. The outline portion of each character is made up of groove-form cells having a narrow width without causing ink flow (running) when the cells are filled with ink as a result of the plate surface being wiped by a doctor blade.

REFERENCES:
patent: 3804622 (1974-04-01), Bergin
patent: 3980018 (1976-09-01), Ichikawa

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