Method for forming plate characters in a half-tone gravure platemaking process
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United States of America Patent
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-
May 28, 1991
Grant Date -
N/A
app pub date -
Feb 8, 1990
filing date -
Jul 3, 1989
priority date (Note) -
Expired
status (Latency Note)
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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.
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