EP0282446A1 - Procédé de réglage continu de l'encrage en impression en creux ou flexographique et machine correspondante - Google Patents

Procédé de réglage continu de l'encrage en impression en creux ou flexographique et machine correspondante Download PDF

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Publication number
EP0282446A1
EP0282446A1 EP88810096A EP88810096A EP0282446A1 EP 0282446 A1 EP0282446 A1 EP 0282446A1 EP 88810096 A EP88810096 A EP 88810096A EP 88810096 A EP88810096 A EP 88810096A EP 0282446 A1 EP0282446 A1 EP 0282446A1
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EP
European Patent Office
Prior art keywords
color
printing
gray
deviation
concentrate
Prior art date
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Granted
Application number
EP88810096A
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German (de)
English (en)
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EP0282446B1 (fr
Inventor
Rudolf Brand
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.)
Gretag AG
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Gretag AG
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    • 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 continuous printing control of the coloring in gravure or flexographic printing according to the preamble of patent claim 1 and a corresponding printing machine according to the preamble of patent claim 8.
  • the color concentration (relative composition of the printing inks from color concentrate, waste and solvent) is one of the most important parameters that must be checked. This has a decisive influence on the coloring of the process as well as the color and tonal quality of the printed product. The quality is still assessed practically exclusively by the eye and with the help of hand densitometers.
  • the color control is carried out on the basis of a single control field which contains all the (colored) printing inks involved (i.e. gray), this being measured and evaluated not by densitometry as previously, but by colorimetry. So you regulate the colorimetric consistency of the gray field and essentially don't care how the individual printing inks behave. This is a completely new "control philosophy" that totally deviates from the previously used procedures. In the known methods, each color has always been controlled individually and, in addition, different tones (high tones, midtones) have been evaluated for measurement in each color.
  • the finished printed sheet 1 which has a printed image 5 and a printed control measurement field 4, which is also explained in more detail below, runs past a photoelectric measurement head 6 and is guided by a deflection roller 6a.
  • the measuring head 6 is connected to an electronic, computer-controlled processing device 100, which cooperates with a monitor 20, an input keyboard 21, a log printer 22 and a synchronization device 25 and controls a dosing control 12.
  • the synchronization device 25, which can be, for example, a clock and angle encoder or a sensor for any synchronization marks that are also printed, synchronizes the printing cylinder 2 with the processing device 100 and ensures that the measuring head 6 is activated exactly at the moment in which the control field 4 passes under it.
  • the printing press shown corresponds essentially to the prior art, so that a more detailed explanation is unnecessary.
  • the differences relevant to the invention relate to the special type of control field 4 used, its measurement and the evaluation and processing of the measured values for the correction variables for the dosing control 12 already mentioned. These differences are explained in more detail below.
  • the control measuring field 4 comprises a print of the three participating printing inks cyan, magenta and yellow, the ratio of which is selected so that an approximate gray with a density of approximately 0.5 results.
  • the size of the control field is typically around 4-10 mm square. It essentially depends on the necessary light output and the speed of the printing sheet.
  • the measuring head 6 is designed as a spectral measuring head, which detects the remissions of the gray field 4 over the entire range of the visible spectrum at, for example, 35 discrete wavelengths (for example every 10 nm). Spectral reflectance measuring heads of this type are known and therefore require no further explanation.
  • the processing device 100 records the most important stages or functional units (all of which are, of course, advantageously implemented in software) a standard color value calculator 10 for predetermined color coordinate calculators 8, a target value memory 7, a color coordination target values, a difference former 9, a parameter memory 24 and a correction calculator 11. Constant values and parameters, as is generally the case, are either stored during programming or entered via keyboard 21.
  • Color coordinate setpoints F 0 * can either be entered via the keyboard or, as is generally the case, can be read in and saved by measuring a reference control measuring field.
  • the standard color value calculator 7 calculates from, for example, 35 individual spectral reflectance values R (possibly averaged over a number of printed sheets) the standard color values N (X, Y, Z) according to the formulas of CIE 1931 (Commission Internationale de L'Eclairage).
  • the color coordinate computer 8 then calculates the three color coordinates from these values F * (L *, a *, b *) of the L *, a *, b * color space of the CIE (or a corresponding other equally spaced color space).
  • the index i stands for the individual inks (cyan, yellow, magenta).
  • the vectorial representation is chosen because the color concentrate, the blend and the solvent are influenced.
  • the actual dosing is carried out by the dosing control 12, which is in addition to the correction vectors ⁇ M i of course also preset (recipe) basic values (vectors M oi ) is taken into account and ensures that the dosing corrections carried out are not only carried out once, but the target vectors are updated accordingly. (The new target vectors result from the sum of the last valid target vectors and the correction vectors.)
  • the practical implementation of the metering control 12 (for example analogous to CH-PS 622 632) is clear to the person skilled in the art and therefore requires no further explanation.
  • FIG. 2 they are individual arithmetic steps, which differ from the difference vector representing the color locus deviation of the control measuring field 4 ⁇ F * to the three correction vectors ⁇ M i lead, shown in the form of a flow chart.
  • the difference vector ⁇ F * has the three components ⁇ L *, ⁇ a * and Ab * .
  • AL * expresses the deviation in brightness, ⁇ a * and ⁇ b * the chromatic deviation.
  • the amount ⁇ C * of the chromatic deviation is first calculated (27). This is followed by a comparison of the magnitude of the brightness deviation AL * and the amount ⁇ C * of the chromatic deviation and a branching depending on how the comparison is based. If the deviation in brightness is not less than the chromatic deviation, the calculation path designated 28 is taken, otherwise path 29.
  • a further decision is first made in path 28: if the brightness deviation is not negative (the control measuring field is too bright), the further calculation is carried out according to path 30, otherwise according to path 31.
  • the pressure is too dark (path 31)
  • the purpose of this correction is to avoid jumps in viscosity when adding color or blends, which are usually more viscous.
  • the solvent correction vector ⁇ T and the concentrate correction vector ⁇ F or the waste correction vector ⁇ V determine the currently required correction of the compositions of the printing inks, ie the current quantities of concentrate, waste and solvent (for example toluene) to be supplied in order to achieve the required composition correction. Now, however, this new composition must also be retained (until a possible new correction is made), which means that the dosing recipe (relative proportions of the color components) must also be adjusted accordingly.
  • the constant vectors ff and vf are each three-component, whereby one component is assigned to one of the three participating (colored) printing inks.
  • the vector ff indicates the color effect in the existing color composition, ie how many volume units (eg liters) of color concentrate must be added to the existing concentrate-blend-solvent mixture in order to change AL * by one unit.
  • the vector gives accordingly vf the blending effect, i.e. the amount of blending to be added for the change in unit AL * (e.g. liters).
  • the components of these vectors are empirical values and must be determined empirically (when the machine is run in).
  • the diagonal matrices (tf) and (tv) each have 3 rows and 3 columns. Their diagonal elements indicate the amount of solvent (toluene) to be added per unit amount of color concentrate or blend in order to keep the overall viscosity (to some extent) constant. Practical values for the diagonal elements of the two matrices are, for example, (0.4 / 0.3 / 0.5) for (tf) and 0.9 / 0.4 / 0.6) for (tv) in the order cyan, magenta and yellow.
  • the diagonal matrices (pf) and (pv) indicate the percentage by which the concentration of the color concentrate (amount of color concentrate based on the sum of the amounts of color concentrate and blend) changes when a unit amount (e.g. 1 liter) of color concentrate or blend in the total amount in circulation is added.
  • a unit amount e.g. 1 liter
  • Practical values for the diagonal elements of (pf) and (pv) are, for example (0.4 / 0.5 / 0.3) and (0.6 / 0.5 / 0.7).
  • av (-100 °), ac ( ⁇ 2150) and a M ( ⁇ 330 °) are the directions (angles) (stored in parameter memory 24) of the primary color axes for yellow, cyan and magenta, then for (r) in the angular range ⁇ Y ⁇ ⁇ ⁇ ⁇ c the matrix in the diaper area a c ⁇ ⁇ ⁇ ⁇ M the matrix and in the angular range ⁇ M ⁇ ⁇ ⁇ ay the matrix be valid.
  • the correction matrices (r) assume that every color deviation is caused by changing only two (of the three participating) colors can be corrected and indicate the percentage changes (ie based on the unit of the AC * amount) for the two colors concerned. Which two colors are used depends on the direction a of the color deviation according to the above selection scheme. (These are the two colors with the direction a falling between their primary color axes.)
  • the amount ⁇ C * is now multiplied by the correction matrix (r) (based on a) and then calculated in exactly the same way as in the case of ⁇ L * ⁇ ⁇ C ⁇ , but instead of AL * , the product ⁇ C * • (r ) stands.
  • paths 45 and 46 are split depending on whether ⁇ C * ⁇ 0 or AC * ⁇ .
  • the end result is then neither a concentrate correction vector ⁇ F or a waste correction vector ⁇ V a solvent correction vector ⁇ T and a recipe correction vector ⁇ f , whereby all these correction vectors now only influence two colors, the third component is therefore zero or (in practice) does not exist.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Printing Methods (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP19880810096 1987-02-23 1988-02-17 Procédé de réglage continu de l'encrage en impression en creux ou flexographique et machine correspondante Expired - Lifetime EP0282446B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH679/87 1987-02-23
CH67987 1987-02-23

Publications (2)

Publication Number Publication Date
EP0282446A1 true EP0282446A1 (fr) 1988-09-14
EP0282446B1 EP0282446B1 (fr) 1991-04-17

Family

ID=4192635

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880810096 Expired - Lifetime EP0282446B1 (fr) 1987-02-23 1988-02-17 Procédé de réglage continu de l'encrage en impression en creux ou flexographique et machine correspondante

Country Status (4)

Country Link
EP (1) EP0282446B1 (fr)
JP (1) JPS63242545A (fr)
DE (1) DE3862409D1 (fr)
DK (1) DK166443B1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5646656A (en) * 1994-02-12 1997-07-08 Heidelberger Druckmaschinen Ag Ink-jet printing device and method
WO2009071133A1 (fr) * 2007-12-06 2009-06-11 Windmöller & Hölscher Kg Gestion de couleur
EP2295248A1 (fr) * 2009-09-10 2011-03-16 Windmöller & Hölscher KG Procédé et dispositif de détermination du comportement spécifique de transfert d'encre d'un cylindre de transfert d'encre

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2410753A1 (de) * 1974-03-06 1975-09-18 Burda Farben Kg Vorrichtung zum bereitstellen einer bestimmten farbmischung zum drucken
US4256131A (en) * 1976-07-14 1981-03-17 Sentrol Systems Ltd. Feedback color control system
EP0089016A1 (fr) * 1982-03-16 1983-09-21 Windmöller & Hölscher Procédé pour le réglage automatique des couleurs imprimées par les machines d'impression flexographiques imprimant en quatre couleurs
CH649842A5 (en) * 1980-02-27 1985-06-14 Roland Man Druckmasch Method for determining individual colour components in a multicolour print by means of a densitometer
FR2594131A1 (fr) * 1986-02-12 1987-08-14 Sublistatic Int Procede automatique pour la preparation d'encres d'impression
EP0255586A2 (fr) * 1986-08-05 1988-02-10 FOGRA Deutsche Forschungsgesellschaft für Druck- und Reproduktionstechnik e.V. Procédé et dispositif pour influencer l'encrage d'une surface encrée dans une machine à imprimer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2410753A1 (de) * 1974-03-06 1975-09-18 Burda Farben Kg Vorrichtung zum bereitstellen einer bestimmten farbmischung zum drucken
US4256131A (en) * 1976-07-14 1981-03-17 Sentrol Systems Ltd. Feedback color control system
CH649842A5 (en) * 1980-02-27 1985-06-14 Roland Man Druckmasch Method for determining individual colour components in a multicolour print by means of a densitometer
EP0089016A1 (fr) * 1982-03-16 1983-09-21 Windmöller & Hölscher Procédé pour le réglage automatique des couleurs imprimées par les machines d'impression flexographiques imprimant en quatre couleurs
FR2594131A1 (fr) * 1986-02-12 1987-08-14 Sublistatic Int Procede automatique pour la preparation d'encres d'impression
EP0255586A2 (fr) * 1986-08-05 1988-02-10 FOGRA Deutsche Forschungsgesellschaft für Druck- und Reproduktionstechnik e.V. Procédé et dispositif pour influencer l'encrage d'une surface encrée dans une machine à imprimer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5646656A (en) * 1994-02-12 1997-07-08 Heidelberger Druckmaschinen Ag Ink-jet printing device and method
WO2009071133A1 (fr) * 2007-12-06 2009-06-11 Windmöller & Hölscher Kg Gestion de couleur
WO2009071330A3 (fr) * 2007-12-06 2009-11-12 Windmöller & Hölscher Kg Procédé et système d'extrapolation de valeurs densitométriques mesurées dans des plages de longueurs d'onde non mesurées sur une presse à imprimer
CN101939167B (zh) * 2007-12-06 2013-07-03 温德莫勒及霍尔希尔公司 色彩管理
EP2295248A1 (fr) * 2009-09-10 2011-03-16 Windmöller & Hölscher KG Procédé et dispositif de détermination du comportement spécifique de transfert d'encre d'un cylindre de transfert d'encre

Also Published As

Publication number Publication date
DK89988A (da) 1988-08-24
DE3862409D1 (de) 1991-05-23
DK89988D0 (da) 1988-02-22
DK166443B1 (da) 1993-05-24
JPS63242545A (ja) 1988-10-07
EP0282446B1 (fr) 1991-04-17

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