Method of controlling the quantity of printing ink and reconditi

Details Method of controlling the quantity of printing ink and reconditi Method of controlling the quantity of printing ink and reconditi

1993-03-15

1994-12-06

Fisher, J. Reed

Printing

Processes

1014011, B41F 3126

Patent

active

053700520

ABSTRACT:
To maintain required or desired ink transfer capability of an anilox roller (6) after wear and tear caused, for example, upon engagement of the surface of the roller against a doctor blade (7a, 7b) of a chambered inking unit (7), the ink receptor depressions or cells (14, 514) in the surface of the roller are formed with a depth which is substantially greater than that necessary for the volumetric dimension for required or desired retention of ink suitable for transfer upon printing with a predetermined print density. Before application of printing ink thereto, the cells are filled with a removable filler material (20), for example copper, plastics such as polyethylene, epoxy, wax or the like. After the surface of the strips or ridges or cell walls becomes worn, a portion of the filler material is removed, for example by vaporization, by a laser, etching or the like, to reconstitute the original volume for ink retention. The change in print density upon printing, as the surface wears, is abrupt (FIG. 4 : tB) and, when that change is determined, the volume-reconstituting step is carried out. If the surface of the roller itself is a layer which is readily machinable, for example made of copper, the initial depth of the cells (14, 514) may be for the initial requirement of ink retention. The layer thickness is then originally made thick enough so that, upon sensing of the abrupt change in print density, for example based on time or on printing results, the depth of the cells still present in the roller can be increased, e.g. by a laser, to obtain and reconstitute the volumetric dimension for desired ink retention.

REFERENCES:
patent: 3589289 (1971-06-01), Ironbequoit
patent: 4993320, Kochsmeier
patent: 5072671 (1991-12-01), Schneider et al.
patent: 5191703 (1993-03-01), John

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