Method of monitoring ink-water balance on a lithographic printin

Details Method of monitoring ink-water balance on a lithographic printin Method of monitoring ink-water balance on a lithographic printin

1984-06-07

1987-06-30

Evans, F. L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

101DIG24, 2503581, 356446, G01N 2149, G01N 2155

Patent

active

046772987

ABSTRACT:
In a lithographic printing system, a light source and a plurality of photodetectors are used to monitor the amount of fountain solution interacting with the ink. The light source irradiates an ink form roller and the photodetectors are disposed at a specular angle and at one or more non-specular angles to monitor the reflected light. An electronic circuit is responsive to the output of the photodetectors and is used for providing an indication of the amount of fountain solution emulsified in the ink, and lying on the surface of the ink.

REFERENCES:
patent: 3065665 (1962-11-01), Akhtar et al.
patent: 3177757 (1965-04-01), Polanyi
patent: 3439175 (1969-04-01), Kammuller et al.
patent: 3693025 (1972-09-01), Brunton
patent: 3870884 (1975-03-01), Williams
patent: 3960451 (1976-06-01), Wirz et al.
patent: 3999864 (1976-12-01), Mutter
patent: 4707197 (1983-10-01), Jeschke

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