EP0505323B2 - Procédé pour le réglage des grandeurs des points de trame pour une presse rotative à imprimer offset - Google Patents

Procédé pour le réglage des grandeurs des points de trame pour une presse rotative à imprimer offset Download PDF

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Publication number
EP0505323B2
EP0505323B2 EP92810205A EP92810205A EP0505323B2 EP 0505323 B2 EP0505323 B2 EP 0505323B2 EP 92810205 A EP92810205 A EP 92810205A EP 92810205 A EP92810205 A EP 92810205A EP 0505323 B2 EP0505323 B2 EP 0505323B2
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EP
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Prior art keywords
printing
values
color
colour
deviations
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Expired - Lifetime
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EP92810205A
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German (de)
English (en)
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EP0505323B1 (fr
EP0505323A1 (fr
Inventor
Herbert Dipl.-Ing. Janser (Eth)
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Wifag Maschinenfabrik AG
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Wifag Maschinenfabrik AG
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Classifications

    • 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

Definitions

  • the invention relates to a method for adjustment the dot sizes for an offset rotary press.
  • these measuring and control elements are essentially independent of print templates Measuring and control elements used.
  • these measuring and control elements become one Set for each inking zone and across the printing width too so-called control strips composed, the outside the printed image in the "white" border of the Printed sheet to be arranged.
  • These control strips are either on-line, i.e. directly in the current Printing press, or off-line on the Substrate scanned, i.e., printing samples are checked outside the press, so then appropriate adjustments are made can.
  • measuring and control elements have the disadvantage that there is no direct relation to those sensitive to tolerance Image areas of the print template created can be. As a result, there are more control elements per printed page to use than actually required would be, and there are no templates specific to these elements Setpoints. It also requires Handling of measuring and control elements is not insignificant effort for printing form production.
  • EP-OS 0 136 542 is concerned with a method to determine the solid color density and the dot gain on two three-color halftone elements using densitometric measurements, calculation formulas and calibration curves. This process is very complex and in practice only with an extremely large one Realizing effort.
  • a method is known from DE-OS 39 25 011 to monitor the print quality multi-colored Print templates of an offset printing machine, at with the help of a camera with color-selective sensor fields
  • Color separation images of the image segment to be checked in the spectral ranges red, green and blue generated and this by means of image analysis methods in an image processing system are processed so that the color layer thickness via a gray value measurement the color grid points of the individual primary colors are determined can be.
  • This procedure is based on the Desired mean color dot density in the measuring segment but does not take into account the Perception of the human eye allowable tolerances.
  • DE-OS 28 29 341 deals with data acquisition for color control systems, using a hand-held densitometer is connected to a color control system.
  • a display device coupled to the densitometer intended.
  • the hand densitometer can be printed on a sheet in freely selectable image zones be measured, which are adapted to the subject; there the measuring points can be in the image area, there is no need for the color control strips mentioned above.
  • DE-OS 33 19 941 shows a method to display a replica of a multicolor print Color image on a screen where data, which are determined for the production of a colored print, retrieved from a storage device and for everyone Printing inks are added selectively, namely to Generation of a density signal that after its processing a color picture tube for displaying the multicolor print controls color image controls.
  • U.S. Patent 4,414,636 shows a color control simulator, a variation with the help of table memories made of different color signals can be.
  • Japanese Patent Application 1-131568 published in Patents Abstract of Japan P-922 August 22, 1989, vol. 13 / no. 377, shows a pressure simulator, at the signals for the yellow, magenta and black Color processed and stored digitally.
  • the Output signals of the memories are switched so that the read signals are each half in horizontal and vertical lines. Therefore can, for example, two images of two Save displayed at the same time and on the screen of the color monitor can be compared.
  • the DE-OS describes this 35 43 444 a process in which on within the color zones printed measuring fields repeated halftone dot sizes, if necessary also solid color densities, be determined and when they fall out tolerance ranges assigned to them by actuation of actuators correcting in the printing process is intervened. Every print job with the help of a catalog of typical test pictures and Color charts classified in an image contrast class. Because of the classification in this class can then tolerance to be observed.
  • the corresponding Target values relate to the image-independent standardized control elements for full and Grid densities.
  • this method has the following Disadvantages: For each print template, a must first Test image can be searched and found; if yourself based on this test picture shows that the tolerance range for the intended printing process is tight, the estimate becomes difficult like the print template when "pushing" the printing process-related Tolerances responded when the limit values of the tolerance range can be reached; Moreover this method does not take into account the different Colored structures of the color separations; and finally it becomes very expensive when the artwork is in Regarding different image zone sensitivities must be classified.
  • the invention has for its object a method for setting the grid point sizes for a To create offset rotary printing press where the disadvantages mentioned above do not occur.
  • a procedure that systematic deviations in color rendering avoids is proposed.
  • this task in a method for setting the screen dot sizes for an offset rotary printing press solved the features of claim 1.
  • the printing form manufactured in accordance with these standards which then causes deviations in the current pressure result in the so-called "pressure characteristics".
  • pressure characteristics consist of the differences between the Process pressure characteristic means according to the standard and the current printing characteristics per inking unit, i.e. statements about the actual pressure and the occurring systematic deviations from the Norm values, especially with the dot gain.
  • the average target values of the screen dot sizes taking into account the expected Actual changes during production and the Print template-specific dependencies of the inking units be adapted to each other.
  • the second aspect of the invention has in claim 2 found its precipitation.
  • this color simulation calculator can the figure to be analyzed, for example a newspaper page on theirs Deviation sensitivities are checked, by the halftone dot sizes of the color separations varies within specified tolerances become.
  • This image influencing is expedient in the same way as on the offset rotary printing press made, namely analog to the color zones and, alternatively, with appropriate input keyboards.
  • both the target submission as well as the test image for the deviations on the screen are shown as a comparison between Images on paper and on the screen too little can be done exactly and also lighting technology cannot be carried out properly.
  • the printer receives during production data acquisition and evaluation via a tolerance monitoring timely warning if the automated supported Settling the limits of their possibilities has reached.
  • the conversion software of the main simulation computer exploited the subtractive process colors cyan, magenta and yellow alternately in the additive process colors violet blue, orange-red and can implement green; this allows the print template relatively very precisely in the sense of a visual target specification display on a high resolution screen; the necessary image information about the Color separations of the three subtractive process colors and black can from the corresponding film or printing plates with the help of a scanner or through the direct transmission of the image information can be obtained from a color separation calculator.
  • Another problem can be pressure disorders, which is the area coverage of the raster image undesirably change.
  • the related changes the screen dot sizes can in principle be two have different causes, namely irregularities in color flow behavior, which can vary up to one degree to the color guide actuators of the Let offset rotary press influence, and so-called "processing errors" that affect the printed image due to errors in the convergence between paper and Affect impression cylinders. This leads to deformations the grid point and thus also changes the dot size.
  • the conventional control gauges via special Analysis elements, the so-called pushing and / or detect duplication of the halftone dots.
  • the measures to reduce the deviations between target and actual values are based the priorities for action when specifying the target values be determined.
  • the provided color separation computer 1 disassembles the originals in the color separations for the four process colors cyan, magenta, yellow and black, which then transferred to the printing forms for the four process colors should be. Then with this Information and the corresponding text in the page break designed the entire page to be printed.
  • the Color separation calculator 1 becomes synonymous with color separation and page break system understood.
  • the page to be printed with the four color separations is from the color separation computer 1 via a data line 11 fed to a color simulation computer 9, the further input signals from a color simulation tablet 21, via a data line 16 from a Densitometer or spectrophotometer 14, over a Data line 19 from an electronic planimeter 18, via a data line 17 from an online measurement Densitometer or spectrophotometer or / and electronic planimeter 15, via a Data line 22 from an AVOR (job preparation) computer 4, and via a data line 10 from receives a film or plate scanner 2.
  • AVOR job preparation
  • the color simulation computer 9 is via a data line 30 connected to the printing form production 31.
  • the output signals of the color simulation calculator 9 via a data line 20 a control station 6 of the rotary printing press 8 and fed to a monitor 13 via a data line 12, which is usually located near the control center 6 located.
  • the film or plate scanner 2 is one Data line 3 to the AVOR (work preparation) computer 4 connected to the control center 6 a data line supplies 5 further input signals.
  • the control center 6 serving as rotation control controls those to be acted upon via a data line 7 Actuators (not shown) in the individual Printing units 8 of the offset rotary printing press on.
  • Color volume For color dosing in offset printing now from the ink layer thickness and the area coverage all halftone dots and solid areas the corresponding within a coloring zone Color volume can be determined. Basically according to the principle of so-called normal coloring method. Then the contrast function for a certain color, a certain color formula (Color batch) and a particular paper maximized. This contrast function is defined as the percentage difference in density related to the corresponding full tone of full tone and screen tone with 3/4 film surface coverage. The contrast maximum is limited at given Materials and pressure ratios the coloring or the solid density upwards as far as at an additional color layer thickness Halftone dots, especially in three-quarter tone, for Tend to go and thus the share of paper white reduce.
  • the solid density is basically defined, so that the Theoretically, the printing process can only be based on the acquisition / monitoring of area coverage and point size can be controlled. In practice, however the relationship between solid density and dot size not constant, so that the dot size during the printing process and solid tone density are monitored have to; however, the full-tone density has a relevance less important than the dot size.
  • the first problem is known to be fluctuations the screen dot sizes and the ink layer thicknesses first as disturbances in the color balance, i.e. overprinting of the inks in the midtones, be perceived.
  • systemic tolerances depending on the Analyze and monitor print template.
  • Ink types available, namely gap inking units controlled by ink zone and ink zoneless Short inking units. These have ink types specific advantages and disadvantages, but for the present Considerations are not relevant and consequently need not be discussed further. However, it is essential that the quality management system presented here optimally used for both ink types can be.
  • inking zone controlled controlled inking unit is the color dosage in the sense of normal coloring template specific to several Color screws in corresponding color zones and accordingly the color requirements of the artwork via the Print width set.
  • offset printing then apply the appropriate dampening adjusted to the dampening system assigned to the inking unit become. For setting and regulating the coloring at the inking unit must therefore depend on the artwork Actuators both on the inking unit and on the dampening unit be operated.
  • the ink is dosed in the sense of normal coloring using a doctored anilox roller basically independent of artwork.
  • Color guide irregularities within the circulation cannot be influenced here in practice unless, to some extent, with Variable humidification.
  • Explanation of the system functioning is based on the Differences in zone-oriented and zoneless inking units.
  • the color separation calculator 1 Original originals in the reproduction department in the Color separations for the four process colors cyan, magenta, yellow and black decomposed. Each can different principles based on order and print template used for the color structure, e.g. "achromatic” or "under color reduction". After that with the so-called page break, the entire printing page designed with text and image. Recently this can be done completely computer-aided, so that the information relevant to the printing technology of the printing pages are available in digital form and about the data line 11 can be passed on. In this sense, the computer 1 is shown schematically here representative of the color separation calculator and electronic Typesetting system.
  • the pages prepared for printing with the Four-color separations are then placed in the printing forms implemented (at 31).
  • an offset printing plate can this is done for example with the help of raster films or after a more recent development direct laser exposure of a light-sensitive plate layer with the digitized stored raster image information.
  • This raster image information are exactly in the reproduction department Screen fineness (lines / cm), screen angulation, screen dot shape and grid point size. In the The reproduction department must determine the grid point size also for an offset printing process pre-compensate for typical dot gain. You needed the relevant press room Tolerant specifications (e.g. optical Halftone dot magnification in the midtone 30 +/- 3%)
  • the Color simulation computer 9 from the offset printing press the current actual values in the form of pressure characteristics. From these pressure characteristics one can derive systematic errors in the color simulation calculator 9 when checking the mean setpoints of the Screen dot sizes can be taken into account.
  • the printing form is produced in the device 31 So with mean setpoints for the screen dot sizes, which are the deviations of the updated printing characteristics per inking unit of the offset rotary printing press consider.
  • the color simulation computer 9 is equipped with conversion software equipped which the subtractive Process colors cyan-blue, magenta-red and yellow alternately in the additive process colors violet blue, can implement orange-red and green; thereby becomes the print template in the sense of a visual target specification on the high-resolution screen of the color simulation computer 9 reproduced.
  • the image information required for this conversion from the color separations of the three subtractive ones Process colors and black can be created using the Scanners 2 from the corresponding films or Printing plates entered in the color simulation computer 9 become. Another possibility is the direct transmission of the corresponding image information from the color separation calculator 1.
  • the second solution has the advantage of quality control of the disk copy by comparing the information on the Data lines 10 from the scanner 2 and 11 from the Color separation calculator 1 is possible. This can in particular the exact functioning of the plate exposure be checked.
  • a use objective quality control and the printing press system-related Monitor tolerances exactly to be able to are at least one more Densitometer or spectrophotometer provided namely either as an off-line system 14 or as an on-line system 15; the corresponding signals will be the color simulation computer 9 via the data line 16 or 17 supplied as actual values for quality control.
  • the printed paper on the rotary press scanning on-line devices 15 work much faster and automate the quality control loop full, but have the disadvantage that they are per web side to be monitored at least one measuring head each and need a uniaxial positioning device; for machines for multi-line production the on-line devices 15 are therefore very expensive.
  • off-line devices 14 which in the simplest version from a measuring table and a manually operated measuring device (densitometer or spectrophotometer) exist; a direct one Measuring point location display using, for example, a Light point is very recommendable.
  • a much more convenient solution for capturing of the actual value for the quality control consists in the assembly of the densimetric or spectrophotometric working measuring head on an automatic controlled cross slide.
  • the required per picture Measuring point coordinates are directly from the software of the color simulation computer 9 specified.
  • Another recording device should be placed used for the actual values of quality control are, namely an electronic planimeter 18; this The device can have the appropriate optics Halftone dots of the individual process colors in the finished Feel the pressure and describe its size and shape.
  • the relevant information will be also the color simulation computer 9 for the target / actual comparison fed.
  • a particularly noteworthy The possibility that arises with this device is Monitoring and, if necessary, correcting the so-called color register or color register. This is the positional accuracy of the one above the other printed color separations to each other and on the Sheet meant.
  • An advantageous embodiment of the devices 14 and 18 also consists of a combination of the corresponding Measuring heads on only one cross slide unit.
  • the Digital wedge consists of precisely defined control elements, especially for the dot size and Full tone density, and can be digital in one Computer system can be saved. At the film or This digital wedge is then also used for direct plate exposure transmitted to the printing form. It can be Elements can be part of the picture or outside the actual printed image on the white edge of the image be applied. In the procedure described here can this digital wedge in terms of composition, Design and arrangement of its Control elements in an optimal way to the print template on the one hand and on the color metering technology on the other adapted and from the color simulation computer 9 on the film or platesetter 31 are transmitted.
  • a particular problem in quality management is the collective production of double cut machines.
  • This Problem can be dealt with effectively, that both templates on the monitor of the Color simulation calculator 9 simultaneously on their tolerance sensitivity examined and accordingly optimal target values and control elements are defined become.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (11)

  1. Procédé de réglage des grandeurs de points de trame pour une presse rotative à imprimer offset, présentant les propriétés ci-après :
    a) les caractéristiques d'impression instantanées de la presse rotative à imprimer offset, par groupe d'impression, avec des matériaux donnés, sont détectées pour un contraste d'impression maximal avant la fabrication de la forme d'impression ;
    b) des valeurs de consigne standard, prédéterminées, concernant les grandeurs de points de trame de la forme d'impression et précompensant la croissance du point sont comparées aux valeurs correspondantes des lignes caractéristiques instantanées détectées ; et
    c) lors de la fabrication de la forme d'impression, en cas d'écart entre les valeurs de consigne standard et les valeurs correspondantes des lignes caractéristiques instantanées détectées, au lieu d'utiliser les valeurs de consigne moyennes standard pour les grandeurs de points de trame de la forme de d'impression, on utilise des valeurs de consigne moyennes compensées de manière correspondante à ces écarts, si bien que l'on évite la manifestation d'écarts systématiques dans la restitution requise des couleurs.
  2. Procédé de réglage des grandeurs de points de trame pour une presse rotative à imprimer offset, présentant les propriétés ci-après ;
    a) les caractéristiques d'impression instantanées de la machine à imprimer offset, par groupe d'impression, avec des matériaux donnés, sont détectées pour un contraste d'impression maximal et l'on détermine à partir de cela des courbes d'étalonnage;
    b) des valeurs de consigne moyennes de sélection polychrome pour les grandeurs de points de trame des différentes sélections polychromes d'un modèle d'impression sont fixées, et
    c) on effectue un calcul de conversion, par l'intermédiaire des courbes d'étalonnage, pour donner des valeurs de consigne de réglage destinées au groupe d'impression de la presse rotative à imprimer offset;
    d) la presse rotative à imprimer rotative offset est réglée selon les valeurs de consigne de réglage;
    e) les valeurs de réglage effectives résultantes obtenues au stade de la production sont comparées aux valeurs de consigne de réglage, et
    f) en cas d'écart entre les valeurs de réglage effectives et les valeurs de consigne de réglage, on adapte la courbe d'étalonnage de manière que l'on puisse éviter les écarts systématiques et les écarts éventuels dans l'impression.
  3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que les caractéristiques instantanées sont détectées plusieurs fois et des valeurs moyennes correspondantes sont constituées à partir des résultats obtenus.
  4. Procédé selon l'une des revendications 2 ou 3, caractérisé en ce que les écarts entre les valeurs de réglage effectives des groupes d'impression, en cas d'impression continue, sont comparés ensemble en partant des valeurs de consigne de réglage, sont mémorisés, évalués périodiquement et utilisés pour effectuer l'adaptation de la courbe d'étalonnage.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé,
    en ce que les sélections chromatiques du modèle d'impression sont représentées sur un écran d'un ordinateur de simulation chromatique (9),
    en ce que les grandeurs de trame des sélections chromatiques sont modifiées sur l'écran en effectuant une modification à dessein des grandeurs, et
    en ce que, sur la base de ces variations, on fixe les valeurs de consigne de sélection chromatique pour les grandeurs de points de trame des différentes sélections chromatiques du modèle d'impression.
  6. Procédé selon l'une des revendications 2 à 5, caractérisé en ce que les sélections chromatiques sont déterminées sur un ordinateur de sélection chromatique (1) et sont transmises à l'ordinateur de simulation chromatique (9).
  7. Procédé selon l'une des revendications 2 à 5, caractérisé en ce que les informations image de la représentation des sélections chromatiques sont déterminées au moyen d'un scanneur (2) pour film ou forme d'impression et sont fournies à l'ordinateur de simulation chromatique (9).
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que, pour déterminer la caractéristique d'impression instantanée, dans le cas d'un contraste d'impression maximal, on effectue une mesure sur des feuilles imprimées au moyen d'un densitomètre et d'un spectrophotomètre (14, 15) et l'on fournit les valeurs de mesure à l'ordinateur de simulation chromatique (9).
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que la forme et la grandeur des points de trame, obtenus sur une feuille imprimée, sont appréhendées au moyen d'un planimètre électronique (18) et sont fournies à l'ordinateur de simulation chromatique (9).
  10. Procédé selon l'une des revendications 2 à 9, caractérisé en ce que, pour assurer la régulation des valeurs de consigne de réglage, on règle le positionnement, par une vis, du réglage chromatique et/ou le réglage du groupe d'humidification sur la presse à imprimer rotative offset.
  11. Procédé selon l'une des revendications 2 à 10, caractérisé en ce que les valeurs de consigne de réglage sont régulées automatiquement à l'aide de stratégies de régulation travaillant en logique non précise, telle qu'en logique floue.
EP92810205A 1991-03-21 1992-03-20 Procédé pour le réglage des grandeurs des points de trame pour une presse rotative à imprimer offset Expired - Lifetime EP0505323B2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4109307 1991-03-21
DE4109307 1991-03-21
DE4209165 1992-03-20
DE4209165A DE4209165A1 (de) 1991-03-21 1992-03-20 Verfahren zur einstellung der rasterpunktgroessen fuer eine offset-rotationsdruckmaschine

Publications (3)

Publication Number Publication Date
EP0505323A1 EP0505323A1 (fr) 1992-09-23
EP0505323B1 EP0505323B1 (fr) 1997-08-13
EP0505323B2 true EP0505323B2 (fr) 2001-11-07

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EP92810205A Expired - Lifetime EP0505323B2 (fr) 1991-03-21 1992-03-20 Procédé pour le réglage des grandeurs des points de trame pour une presse rotative à imprimer offset

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Country Link
US (1) US5602970A (fr)
EP (1) EP0505323B2 (fr)
DE (2) DE59208787D1 (fr)
FI (1) FI103395B1 (fr)

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FI921202A (fi) 1992-09-22
EP0505323B1 (fr) 1997-08-13
FI103395B (fi) 1999-06-30
FI103395B1 (fi) 1999-06-30
DE4209165A1 (de) 1992-09-24
EP0505323A1 (fr) 1992-09-23
US5602970A (en) 1997-02-11
FI921202A0 (fi) 1992-03-20
DE59208787D1 (de) 1997-09-18

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