Dampening water control method and printing apparatus

Details Dampening water control method and printing apparatus Dampening water control method and printing apparatus

2011-08-09

2011-08-09

Colilla, Daniel J (Department: 2854)

Printing

Processes

Condition responsive

C101S450100

Reexamination Certificate

active

07992493

ABSTRACT:
Line patches m and solid patches s are printed with a subject image, each line patches having at least 200 lines per inch and a duty ratio of at least 60%, to detect densities Dm and Ds. A water coefficient W (=Dm/Ds) is calculated from the detected densities Dm and Ds. Whether dampening water is fed at a proper rate or not is determined based on correlation data stored beforehand and showing a relationship between the feed rate of dampening water and the water coefficient W. The feed rate of dampening water is controlled to be a proper rate.

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