EP0282446B1 - 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
EP0282446B1
EP0282446B1 EP19880810096 EP88810096A EP0282446B1 EP 0282446 B1 EP0282446 B1 EP 0282446B1 EP 19880810096 EP19880810096 EP 19880810096 EP 88810096 A EP88810096 A EP 88810096A EP 0282446 B1 EP0282446 B1 EP 0282446B1
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Prior art keywords
printing
color
deviation
concentrate
colour
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EP19880810096
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German (de)
English (en)
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EP0282446A1 (fr
Inventor
Rudolf Brand
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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 regulating the production of the coloring in gravure or flexographic printing according to the preamble of claim 1.
  • 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. It has a decisive influence on the color of the process and 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 (i.e. gray) control field containing all the (colored) printing inks involved, which is not measured and evaluated densitometrically, as is usually the case, but colorimetrically. So you regulate the colorimetric consistency of the gray field and essentially don't care how the individual printing inks behave.
  • This is a "rule philosophy" that deviates from most of the usual procedures.
  • each color has been controlled individually and, in addition, different tones (high tones, midtones) have been evaluated for the measurement. Mixed tones have only been used secondarily in order to obtain a certain amount of correction information if the single color control fails.
  • the method according to the invention is limited to a single point of the printing characteristic curves and considers the course of the individual colors (in particular the individual full tones) to be of secondary importance. According to the prevailing doctrine, this procedure would not work in practice.
  • CH-A-649 842 and FR-A-2 594 131 are also known from the prior art.
  • CH-A-649 842 shows a press control based on densitometric measurements.
  • FR-A-2 594 131 discloses a transfer printing machine with a computer controlled mixing system for providing the correct printing inks. None of these publications deals with the special control of the coloring on flexographic or gravure printing machines on a colorimetric basis, as defined by claim 1.
  • 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 measuring 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 metering 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 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 in e.g. 35 discrete wavelengths recorded (e.g. every 10 nm). Spectral reflectance measuring heads of this type are known and therefore require no further explanation.
  • the processing device 100 detects as the most important stages or functional units (all of which are of course advantageously implemented in software) a standard color value calculator 7, a color coordinate calculator 8, a target value memory 10 for predetermined color coordination target values, a difference generator 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 coordinates Setpoints F0 * can either be entered using the keyboard or, as is generally the case, read in and saved by measuring a reference control measuring field.
  • 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 solvent correction vector ⁇ T ⁇ F ⁇ (tf) or ⁇ V ⁇ (tv) is formed from the concentrate correction vector or the waste correction vector by multiplication with corresponding diagonal matrices (tf) or (tv).
  • 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 .DELTA.T and the concentrate correction vector .DELTA.F and the waste correction vector .DELTA.V determine the currently required correction of the compositions of the printing inks, i.e. the amount of concentrate, blend and solvent (e.g. toluene) to be added at the moment 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 concentrate correction vector ⁇ F is multiplied by a diagonal matrix (pf) (path 30) or the blend correction vector ⁇ V by a diagonal matrix (pv) (path 31) to give the recipe correction vector ⁇ f, which is then combined with the other correction vectors of the metering control 12 are supplied and processed by the latter in the sense explained.

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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)

Claims (5)

1. Procédé de régulation continue de l'encrage en impression héliographique ou flexographique, dans lequel on mesure, par voie colorimétrique, les plages de contrôle imprimées en même temps, sous forme de plages (4) de gris contenant toutes les encres de couleur intéressées, on compare les résultats de mesure (F*) avec des valeurs prescrites (F * o
Figure imgb0009
) dans un système homogène du point de vue métrique de sensation créée, en particulier dans l'espace colorimétrique de laboratoire selon la CIE, et on réajuste les compositions relatives des encres en concentré (Fi), diluant (Vi) et solvant (Ti) en fonction du résultat de la comparaison (ΔF*), procédé caractérisé par le fait que la comparaison des résultats de mesure (F*) et des valeurs prescrites (F * o
Figure imgb0010
) se fait dans un espace chromatique qui permet d'indiquer indépendamment la brillance (L*) et la couleur (C*); par le fait que, lors du calcul des valeurs nécessaires pour le réajustement des compositions des encres, on procède différemment selon que chaque fois l'écart sur la brillance (ΔL*) de la plage (4) des gris est supérieur ou inférieur à l'écart sur la couleur (ΔC*), étant précisé que le calcul se fait dans le premier cas sur la base de l'écart sur la brillance et dans le second cas sur la base de l'écart sur la couleur, et par le fait que le calcul se fait différemment selon que chaque fois l'écart (ΔL*) déterminé sur la brillance est positif ou négatif, étant précisé que, dans un cas, on n'intervient essentiellement que sur le concentré d'encre (Fi) et dans l'autre cas que sur le diluant (Vi).
2. Procédé selon la revendication 1, caractérisé par le fait que les plages de gris présentent une densité d'environ 0,5.
3. Procédé selon l'une des revendications 1-2, caractérisé par le fait que le réajustement, à court terme, de la composition des encres se fait par addition directe et immédiate de concentré d'encre (Fi) et de diluant (Vi) et de solvant (Ti).
4. Procédé selon l'une des revendications 1-3, caractérisé par le fait que le réajustement, à long terme, de la composition des encres ne se fait essentiellement que par variation des proportions relatives de concentré (Fi) et de diluant (Vi).
5. Procédé selon l'une des revendications 1-4, caractérisé par le fait qu'une seule plage (4) des gris est essentiellement prévue par produit imprimé.
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
CH67987 1987-02-23
CH679/87 1987-02-23

Publications (2)

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

Family

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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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4404557A1 (de) * 1994-02-12 1995-08-17 Heidelberger Druckmasch Ag Verfahren zum Tintenstrahldruck und Tintenstrahldruckvorrichtung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2373415T5 (es) * 2007-12-06 2019-12-17 Windmoeller & Hoelscher Manejo de color
ES2430619T3 (es) * 2009-09-10 2013-11-21 Windmöller & Hölscher Kg Procedimiento y dispositivo para la determinación del comportamiento específico de transporte de tinta de un rodillo transportador de tinta

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4256131A (en) * 1976-07-14 1981-03-17 Sentrol Systems Ltd. Feedback color control system
IT1135365B (it) * 1980-02-27 1986-08-20 Roland Man Druckmasch Procedimento per determinare singoli componenti cromatici in una stampa in plicromia per mezzo d'un densitometro
DE3209483A1 (de) * 1982-03-16 1983-09-29 Windmöller & Hölscher, 4540 Lengerich Verfahren zum automatischen einstellen der von flexodruckmaschinen fuer den vierfarbendruck ausgedrucktenfarben
FR2594131B1 (fr) * 1986-02-12 1988-08-05 Sublistatic Int Procede automatique pour la preparation d'encres d'impression
DE3626423A1 (de) * 1986-08-05 1988-02-11 Deutsche Forsch Druck Reprod Verfahren und vorrichtung zur beeinflussung der farblichen erscheinung einer farbflaeche bei einem druckvorgang

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4404557A1 (de) * 1994-02-12 1995-08-17 Heidelberger Druckmasch Ag Verfahren zum Tintenstrahldruck und Tintenstrahldruckvorrichtung

Also Published As

Publication number Publication date
DK89988D0 (da) 1988-02-22
DE3862409D1 (de) 1991-05-23
DK89988A (da) 1988-08-24
JPS63242545A (ja) 1988-10-07
EP0282446A1 (fr) 1988-09-14
DK166443B1 (da) 1993-05-24

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