Printing with a limitation of layer thickness and of tonal-value

Details Printing with a limitation of layer thickness and of tonal-value Printing with a limitation of layer thickness and of tonal-value

1990-04-24

1991-06-11

Evans, Arthur G.

Boots, shoes, and leggings

364100, G06K 1500

Patent

active

050238124

ABSTRACT:
Control system for inking a printing press wherein a sheet printed by the printing press is measured photoelectrically in a plurality of test areas and thus-obtained measured values are processed in conjunction with setpoint values to form control data, based upon which the inking of the printing press is controlled, which comprises computing a tonal-valve increase at an actual locus and at a setpoint locus from at least one measured value of a half-tone field and of a full-tone field of a printed sheet; if the tonal-value increase at the setpoint locus is not a tolerable tonal-value increase, determining corresponding tolerance limits of ink layer thickness for a maximum and a minimum tolerable tonal-value increase; with the ink layer thickness, computing a possible locus at the limit of the tolerable tonal-value increase as a new setpoint locus, and triggering the setpoint locus, if it is additionally within a color tolerance and density tolerance, respectively.

REFERENCES:
patent: 4390958 (1983-06-01), Mamberer
patent: 4494875 (1985-01-01), Schramm et al.
patent: 4535413 (1985-08-01), Shiota et al.
Publication FOGRA-Mitteilungen Nr. 120, pp. 1-6, Peter Kossler: "Tonwertzunahme im Mehrfarbendruck-Offsetdruck".
Publication Papier und Druck 31 (1982) 3, Druck und Verarbeitung, pp. 33-36; Lubbe: "Farbe, Farbmessung und Farbdichtmessung".
Publication BANKS: Advances in Printing Science and Technology, 16, Pentech Press London: Plymouth, 1982, pp. 97-120.

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