EP0089016B1 - Verfahren zum automatischen Einstellen der von Flexodruckmaschinen für den Vierfarbendruck ausgedruckten Farben - Google Patents

Verfahren zum automatischen Einstellen der von Flexodruckmaschinen für den Vierfarbendruck ausgedruckten Farben Download PDF

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Publication number
EP0089016B1
EP0089016B1 EP83102351A EP83102351A EP0089016B1 EP 0089016 B1 EP0089016 B1 EP 0089016B1 EP 83102351 A EP83102351 A EP 83102351A EP 83102351 A EP83102351 A EP 83102351A EP 0089016 B1 EP0089016 B1 EP 0089016B1
Authority
EP
European Patent Office
Prior art keywords
colour
color
triangle
actual
determined
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83102351A
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German (de)
English (en)
French (fr)
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EP0089016A1 (de
Inventor
Klaus P. Dr. Dotzel
Heinz Eschmeier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Windmoeller and Hoelscher KG
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Windmoeller and Hoelscher KG
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Publication of EP0089016A1 publication Critical patent/EP0089016A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply

Definitions

  • the invention relates to a method for the automatic setting of the colors printed by flexographic printing presses with printing plate cylinders and impression cylinders for four-color printing with the printing colors yellow, magenta, cyan and black.
  • flexographic printing can still cause color shifts due to the fact that the individual plate cylinders are positioned differently against the associated impression cylinder, so that due to the respective center distance of the plate and impression cylinder, the pressure is appropriate the individual grid points of the flexible clichés are broadened and cover an area corresponding to the respective pressure on the web to be printed.
  • the conditions are such that the halftone dots are widened with a decreasing center distance and thus increasing contact pressure and cover an increasingly larger area of the material to be printed. This changes the percentage of each color printed on the printed surface, so that the color tone changes accordingly.
  • the object of the invention is therefore to provide a method by which the printed colors can be automatically adjusted correctly without changing the color tone and / or the color strength of the individual printing inks.
  • this object is achieved in that, in order to determine the color setpoint in a color triangle serving to compare the colors, the corners of which are defined by the printing inks yellow, magenta and cyan, the color location for a screen test field printed out by all printing units, in which each of the printing inks has its own Color component is between about 40 and 60% involved, it is determined that to determine the actual value of the color based on a densitometric measurement, the actually present proportions of the printing inks are measured in the test field and from the measurement the color location of the actual value in the color triangle It is determined that from the comparison of the color words the deviations of the actual values of the color components from the nominal values of the color components of each color are determined and that the center distance of the plate cylinder of the respective color from the impression cylinder is changed according to the deviations until the actual and the target -Value in the color triangle match.
  • the correct hue and the correct color strength of the individual printing inks are set, for example, using the method described in DE-A-30 07 421.
  • each color box color is measured in a known manner with a densitometer with blue, red and green filters, so that this measurement gives the parts of the complementary colors in the color box color which correspond to the original.
  • the remission curve with which the measured colors can be clearly determined can be determined from the densitometer measurements by approximate integration.
  • a triangle of a polar coordinate system is formed from the color box colors, in the present case yellow, magenta and cyan, the zero point of which is determined by the achromatic point. From this achromatic point, vectors can be drawn to the degrees of mixing that delimit the triangle, so that the angle of the vector indicates the miscible hue.
  • the length of the vector is a measure of the degree of chromaticity, which can be determined by adding black.
  • the color polygon or the color triangle indicates the respective color level, whereby the color strength is defined by the length of the plumb line on the lowest color level, whose coordinate zero point is white.
  • the coordinate zero point of the top color level is black.
  • the color intensity is determined by the length of the vector, the hue by the vector angle and the color intensity by the length of the solder and is compared with a predetermined target value in order to determine the measured color.
  • color concentrate or waste is added in the manner specified in DE-A-30 07 421.
  • the printed colors are set using the method according to the invention.
  • the color location for the color setpoint is determined in a color triangle, the corners of which are defined by the printing inks yellow, magenta and cyan, which must be shown by a screen test field printed out by all printing units.
  • This color setpoint is expediently set in the color triangle in such a way that each of the printing inks with a color proportion of between about 40 and 60% is involved. The proportion of all printing inks should be large enough to be able to measure sufficiently large values.
  • the actual value of the color in the actually printed raster test field is determined in a known manner by densitometric measurements with red, green and blue filters, so that the color location of the actual value in the previously defined color triangle can be determined from the measurement.
  • the deviations of the actual values of the color components from the nominal values of the color components of each color can be determined.
  • the center distance of the plate cylinder of the respective color from the impression cylinder is then changed in such a way that the actual value and the target value are brought into agreement in the color triangle.
  • the measured actual value of the color by rotating rays around the magenta corner point and the cyan corner point of the Triangles can be converted to the setpoint that lines are drawn in the color triangle starting from the corners through the center of gravity that corresponds to the black point, and the quadrilaterals that are defined by the triangle lines starting from the corners and the lines that extend beyond the center of gravity , are completely covered by the color determined by the associated triangular corner point, that from each line of the square within the color triangle assigned to a color, which is formed by the line extending beyond the center of gravity, a decreasing color wedge corresponds to the color of the square closed by this line the opposite corner point is formed in the triangle, which is determined with this line as the base through a triangle side and the connecting line between the center of gravity and the corner point, and that the extent of the axis distance change of the plate cylinder from the impression cylinder is determined by the angles that the two Rays from each n Cover the actual value to the target value.
  • a section of the printed image is selected as the raster test field which corresponds to a selected target value with a color distribution that is as uniform as possible.
  • Such suitable raster test fields can be found in all printed images, so that it is not necessary to provide a separate raster test field, but instead the densitometric measurements for determining the actual value can be carried out directly in the printed image.
  • the corner points of the triangle need not be formed by the basic printing inks, they can also consist of other colors.
  • the color tone achieved on the material to be printed is determined by the coloristic properties of the printing ink and its concentration. Experience has shown that the color tone for highly qualified four-color halftone prints must be in very specific areas. The corresponding hue values and the color strength as well as the degree of color are determined for each of the printing inks yellow, magenta and cyan.
  • the color tone is defined here as the angle of rotation around the gray axis of the color circle, the color strength as total density and the degree of color as the distance of the color tone vector from the black center of the color circle.
  • the color strength value depends on the color concentration.
  • the upward deviation from the target value indicates a higher concentration, which can be compensated for by adding blends. If the color strength is too low, it is corrected by adding concentrate.
  • the concentration of the printing ink is set correctly, the color strength measured in the full-area test field depends on the ink layer thickness. This is determined in the inking unit by the inclusion of the anilox roller on the forme cylinder, so that it is possible to adjust the center distance via the corresponding servomotors after the measured color strength.
  • the density values of the printed colors are measured on a test field printed in three colors in the basic colors with known screen coverings and the actual screen coverings are calculated.
  • the control commands for the servomotors, which set the center distance of the plate and counter-pressure cylinders, result from the difference between the actual and the setpoints.
  • the type of determination of the control commands for the servomotors is explained in more detail below using the color triangle Y-M-C.
  • the color triangle shown is created by printing raster wedges in three colors.
  • the corner points of the triangle are formed by the three primary colors yellow (Y), magenta (M) and cyan (C).
  • the focus of this triangle S is the full overlay of the primary colors.
  • magenta is printed over the entire surface and yellow and cyan with a correspondingly increasing screen wedge.
  • cyan is printed over the entire surface and the other two colors are printed with decreasing or increasing grid wedges.
  • the cyan raster portion is a function of the angle of rotation a about the magenta point M and the magenta raster portion is a function of the angle of rotation ⁇ about the cyan point C.
  • the situation in the other fields is similar.
  • Each point in the color triangle is thus clearly defined by two angles of rays, which can be rotated around the magenta and cyan points.
  • the corresponding grid coverage can be calculated if the functions are determined experimentally.
  • the coordinate system rc shown in the drawing is the same as that used to determine the dimensions for the hue, the color strength and the chromaticity.
  • the grid coverage proportions can thus be determined from the optical densities.
  • the differences between the target and actual values are measured numbers for the number of pulses for the servomotors.
  • the densitometer is used to measure the grid test field, in which the colors yellow, magenta and cyan are each present to about 40 to 60%.
  • the densities measured by the densitometer behind the three colored filters are then fed to a process computer.
  • the corresponding control commands for the servomotors for the adjustment of the plate cylinder to the impression cylinder are determined from the target / actual value comparison of the grid area covers determined from the grid test field.
  • the target values are approximated until the desired print image is achieved after visual assessment.
  • the actual values achieved are determined as target values for the production run.
  • the specified target numbers are continuously monitored automatically during the printing phase. The results can be displayed on a screen. The readjustment can take place automatically as in the setup phase.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Methods (AREA)
EP83102351A 1982-03-16 1983-03-10 Verfahren zum automatischen Einstellen der von Flexodruckmaschinen für den Vierfarbendruck ausgedruckten Farben Expired EP0089016B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3209483 1982-03-16
DE19823209483 DE3209483A1 (de) 1982-03-16 1982-03-16 Verfahren zum automatischen einstellen der von flexodruckmaschinen fuer den vierfarbendruck ausgedrucktenfarben

Publications (2)

Publication Number Publication Date
EP0089016A1 EP0089016A1 (de) 1983-09-21
EP0089016B1 true EP0089016B1 (de) 1985-06-05

Family

ID=6158365

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83102351A Expired EP0089016B1 (de) 1982-03-16 1983-03-10 Verfahren zum automatischen Einstellen der von Flexodruckmaschinen für den Vierfarbendruck ausgedruckten Farben

Country Status (5)

Country Link
US (1) US4667596A (ja)
EP (1) EP0089016B1 (ja)
JP (1) JPS58175687A (ja)
CA (1) CA1199521A (ja)
DE (1) DE3209483A1 (ja)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0196431B1 (de) * 1985-03-21 1992-11-11 Felix Brunner Verfahren, Regelvorrichtung und Hilfsmittel zur Erzielung eines gleichförmigen Druckresultats an einer autotypisch arbeitenden Mehrfarbenoffsetdruckmaschine
US5182721A (en) * 1985-12-10 1993-01-26 Heidelberger Druckmaschinen Aktiengesellschaft Process and apparatus for controlling the inking process in a printing machine
ATE47564T1 (de) * 1985-12-10 1989-11-15 Heidelberger Druckmasch Ag Verfahren zur farbauftragssteuerung bei einer druckmaschine, entsprechend ausgeruestete druckanlage und messvorrichtung fuer eine solche druckanlage.
DE3862409D1 (de) * 1987-02-23 1991-05-23 Gretag Ag Verfahren zur fortdruckregelung der farbgebung beim tief- oder flexodruck und entsprechende druckmaschine.
DE3714179A1 (de) * 1987-04-29 1988-11-17 Forschungsgesellschaft Fuer Dr Verfahren zur steuerung der farbgebung im mehrfarbendruck
FI78025C (fi) * 1987-08-31 1989-06-12 Valtion Teknillinen Foerfarande foer kvalitetskontroll av tryckning.
US4967379A (en) * 1987-12-16 1990-10-30 Gretag Aktiengesellschaft Process for the ink control or regulation of a printing machine by comparing desired color to obtainable color data
DE58901780D1 (de) * 1988-01-14 1992-08-13 Gretag Ag Verfahren und vorrichtung zur farbregelung einer druckmaschine.
DE3812099C2 (de) * 1988-04-12 1995-01-26 Heidelberger Druckmasch Ag Verfahren zur Farbsteuerung einer Offsetdruckmaschine
DE3903981C2 (de) * 1989-02-10 1998-04-09 Heidelberger Druckmasch Ag Verfahren zur Regelung der Farbfüllung bei einer Druckmaschine
DE3913382C2 (de) * 1989-04-24 1995-12-14 Heidelberger Druckmasch Ag Verfahren zur Steuerung der Farbführung einer Druckmaschine
DE4431270C2 (de) * 1993-10-21 1997-01-16 Roland Man Druckmasch Verfahren zur Steuerung der Farbführung einer autotypisch arbeitenden Druckmaschine
DE4413735C2 (de) * 1994-04-20 2003-09-25 Heidelberger Druckmasch Ag Verfahren zum Steuern oder Regeln des Druckprozesses einer autotypisch arbeitenden Druckmaschine beim Drucken unter Druckpressung auf einen Bedruckstoff
US5819655A (en) * 1997-08-20 1998-10-13 Bristol-Myers Squibb Company Cyclinder color printing method and product using improved misregistration detection
US5895836A (en) * 1997-11-06 1999-04-20 Uzik; Barry K. Greyscale calibration method in digital printing
US6774907B1 (en) * 1999-12-17 2004-08-10 Adobe Systems Incorporated Tint transformation of fill
DE20122584U1 (de) * 2001-03-27 2006-07-27 Windmöller & Hölscher Kg Einheit zur Einstellung des Druckbildes in einer Rotationsdruckmaschine
US20040200369A1 (en) * 2003-04-11 2004-10-14 Brady Thomas P. Method and system for printing press image distortion compensation
DE102006025898A1 (de) * 2006-06-02 2007-12-06 Heidelberger Druckmaschinen Ag Verfahren zur Berechnung von Korrekturwerten in einer Farbsteuerung oder Farbregelung für eine Druckmaschine
US9325860B2 (en) 2010-12-01 2016-04-26 Quadtech, Inc. Line color monitoring system
WO2012084452A1 (en) * 2010-12-23 2012-06-28 Tetra Laval Holdings & Finance S.A. Improved flexographic printing, device and method
IT1403496B1 (it) 2010-12-27 2013-10-17 Uteco Converting Spa Sistema e procedimento di regolazione e controllo delle pressioni di cilindri di stampa in una macchina da stampa flessografica a tamburo centrale

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE549962C (de) * 1932-05-04 Julius Fischer Maschinenfabrik Verfahren und Vorrichtung zum Einstellen von Musterwalzen an Mehrfarben-Rollendruckmaschinen
US2969016A (en) * 1955-03-18 1961-01-24 Crosfield J F Ltd Colour printing
FR1255224A (fr) * 1960-04-22 1961-03-03 Dunlop Sa Perfectionnements aux appareils pour la production ou l'enduisage des feuilles
DE2060000A1 (de) * 1970-12-05 1972-06-15 Hell Rudolf Dr Ing Gmbh Verfahren und Anordnung zur Regelung der Farbgebung beim Drucken
GB1458358A (en) * 1973-02-05 1976-12-15 Sira Institute Method and apparatus for colour inspection
DE2832382A1 (de) * 1978-07-24 1980-02-14 Juergen Prof Dr Kuehlwetter Vorrichtung zur identifizierung von farben
DE2941521C2 (de) * 1979-10-12 1982-11-25 Windmöller & Hölscher, 4540 Lengerich Verfahren zum Austauschen der Formzylinder einer Flexodruckmaschine
DE3007421A1 (de) * 1980-02-27 1981-09-03 Windmöller & Hölscher, 4540 Lengerich Verfahren zur herstellung eines vorlagengetreuen farbengemisches, insbesondere einer farbe eines mehrfarbendruckes

Also Published As

Publication number Publication date
DE3209483A1 (de) 1983-09-29
JPS58175687A (ja) 1983-10-14
EP0089016A1 (de) 1983-09-21
CA1199521A (en) 1986-01-21
US4667596A (en) 1987-05-26

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