Printing – Intaglio – Processes
Patent
1978-01-26
1980-04-29
Fisher, J. Reed
Printing
Intaglio
Processes
101395, 1014011, B41M 110, B41M 906, B41N 106
Patent
active
042000440
ABSTRACT:
An improved gravure printing method and apparatus is disclosed which is particularly useful in gravure printing operations which involve both tonal work and line work. The tonal work image on the gravure printing surface is engraved to form a multiplicity of varying depth ink wells separated by a grid of doctor-blade supports spaced to provide a high degree of resolution of the tonal work. The line work image of the gravure printing surface is engraved to form a multiplicity of ink wells all similar in depth and shallower in depth than at least some of the ink wells in the tonal work. These ink wells are separated by a grid of doctor-blade supports spaced with a centerline-to-centerline spacing substantially greater than the spacing of the doctor-blade supports for the tonal work to provide only a small number of intersections between the doctor-blade supports and the edges of the printed line work, thereby improving the continuity and smoothness of the edges of the printed line work. Prior to engraving the ink wells, the doctor-blade-support areas in the line work image have a substantially smaller width than the doctor-blade-support areas in the tonal work image, which also improves the continuity of the edges of the printed line work and reduces the various spans between adjacent ink wells in the line work image. In the preferred embodiment of the invention, the ink wells in the line work image having a greater surface area relative to the surface area of the doctor-blade supports, and are engraved more shallow than the ink wells in regions of similar hue in the tonal work image.
REFERENCES:
patent: 2039195 (1936-04-01), Stirling
patent: 2456608 (1948-12-01), Alger
Rotogravure, "A Survey of European and American Methods," H. M. Cartwright & R. MacKay, MacKay Publ. Co. Inc., Lyndon, Kentucky, 1956.
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