EP 0388697 A3 19910410 - METHOD FOR SETTING A MEASURE FIELD FOR MEASURING THE THICKNESS OF THE DAMPENING FILM IN AN OFFSET PRINTING PLATE
Title (en)
METHOD FOR SETTING A MEASURE FIELD FOR MEASURING THE THICKNESS OF THE DAMPENING FILM IN AN OFFSET PRINTING PLATE
Publication
Application
Priority
DE 3909401 A 19890322
Abstract (en)
[origin: JPH03101939A] PURPOSE: To enable optimum determination of a measuring place for measuring the thickness of a dampening water layer, without monitoring continuously the surface of an offset printing plate, by conducting evaluation of measured data in such a manner that the measuring place is located in a longitudinal zone wherein the average ink area percentage is as small as possible. CONSTITUTION: First the surface 3 of an offset printing plate 2 is scanned by a measuring head 4 in the longitudinal direction 12, that is, along a longitudinal zone 8. Measured values obtained in the scanning of the individual longitudinal zone 8 having an area wherein ink does not stick are sent to an evaluation unit 6 and the evaluation unit 6 determines an average ink area percentage (percentage of sticking of ink in a face portion in some determined grid) from the measured data. Then, only the longitudinal zone 8 wherein the average ink area percentage is the smallest is selected. The figure shows that a measuring place 17 is located in the third longitudinal zone 8 from the left. Based on an output 7 of the evaluation unit 6, the thickness of a dampening water layer on the surface 3 is controlled in regard to a prescribed set value by the operation of a control device.
IPC 1-7
IPC 8 full level
B41F 33/14 (2006.01); B41F 7/24 (2006.01); B41F 33/00 (2006.01)
CPC (source: EP US)
B41F 33/0063 (2013.01 - EP US)
Citation (search report)
- [AD] DE 3636507 A1 19880428 - GRAPHO METRONIC GMBH & CO [DE]
- [A] FR 2538761 A1 19840706 - POLYGRAPH LEIPZIG [DD]
Designated contracting state (EPC)
CH DE FR GB IT LI SE
DOCDB simple family (publication)
EP 0388697 A2 19900926; EP 0388697 A3 19910410; CA 2009644 A1 19900922; CA 2009644 C 19940125; DE 3909401 A1 19900927; DE 3909401 C2 19940210; JP H03101939 A 19910426; US 5108186 A 19920428
DOCDB simple family (application)
EP 90104179 A 19900303; CA 2009644 A 19900208; DE 3909401 A 19890322; JP 6991190 A 19900322; US 49749090 A 19900322