EP1184176B1 - Method for correcting locally machine-produced colouring errors in rotary printing machines - Google Patents

Method for correcting locally machine-produced colouring errors in rotary printing machines Download PDF

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Publication number
EP1184176B1
EP1184176B1 EP20010117735 EP01117735A EP1184176B1 EP 1184176 B1 EP1184176 B1 EP 1184176B1 EP 20010117735 EP20010117735 EP 20010117735 EP 01117735 A EP01117735 A EP 01117735A EP 1184176 B1 EP1184176 B1 EP 1184176B1
Authority
EP
European Patent Office
Prior art keywords
printing
inking
uniformities
machine
tone values
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 - Fee Related
Application number
EP20010117735
Other languages
German (de)
French (fr)
Other versions
EP1184176A2 (en
EP1184176A3 (en
Inventor
Axel Dr. Hauck
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE10042680 priority Critical
Priority to DE2000142680 priority patent/DE10042680A1/en
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP1184176A2 publication Critical patent/EP1184176A2/en
Publication of EP1184176A3 publication Critical patent/EP1184176A3/en
Application granted granted Critical
Publication of EP1184176B1 publication Critical patent/EP1184176B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F33/00Indicating, counting, warning, control or safety devices
    • B41F33/0036Devices for scanning or checking the printed matter for quality control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41PINDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2233/00Arrangements for the operation of printing presses
    • B41P2233/10Starting-up the machine

Description

  • The invention relates to a method for correcting local, machine-related dyeing errors on rotary printing presses, which can occur as striping, color waste or as stenciling in the finished printed product whose quality.
  • Due to the construction of the offset printing units, the offset printing process does not offer the possibility of uniformly coloring a printed sheet or coloring the screen dots with a constant layer thickness for a given subject. Although the inking of the printing form mounted on the circumference of a plate cylinder is effected continuously via an offset printing unit with a color film which has previously been reduced to a specific ink film thickness by a multiplicity of friction or bridge rollers. However, the color decrease takes place discontinuously, because on the one hand, the color decrease is dependent on the subject and on the other hand, the peripheral surfaces of the printing plate receiving plate cylinder is discontinuous by the clamping channels.
    Disturbances in the color transfer, for example, at the interface of the inking unit to the surface of the color cylinder to the transfer cylinder plate cylinder, at the interface between the printing forme cylinder and transfer cylinder surfaces and at the interface between the surface of the transfer cylinder, which is usually given by a rubber blanket-like elevator, with the printing substrate lead to non-uniformities, which can affect both the transferred ink layer thicknesses as well as with respect to the grid areas on the generated dot size. The resulting effects are banding, ink drop in the printing direction and stenciling effects. The connections between these phenomena in the inking unit are quite complex and can not be viewed in isolation from each other.
  • In order to achieve a high uniformity in the course of the color density or the ink layer thickness in the printing, these effects are largely taken into account in the design of inking units on rotary printing machines in the context of simulation programs and design principles, the inking unit is optimized in terms of the effects mentioned. In addition, there is the possibility, for example by influencing rollers used in the inking unit and their time of use to influence these errors. Furthermore, the selection of suitable transfer elevator surfaces, such as blankets, acting as transfer cylinder elevators, allows the occurrence of dynamically induced streaks to be reduced. However, a targeted local correction of inking color irregularities in the print is not achievable with these measures.
  • From the DE 39 25 533 A1 a method for the production of printing forms is known, which makes a correction of halftone dots in the exposure of a printing plate depending on Tonwertstörgrößen. The method is used to correct partial areas, so-called benefits, on printing forms to a normal tone value, if deviations are to be expected in certain areas due to disturbances in the printing press. This ensures that the individual faces on the printing form have the same tonal values. This is important because the faces usually have the same print image as the benefit, so the benefits cut later would have a different appearance if tone differences persisted between each benefit. The equalization of the benefits among each other ensures that they are indistinguishable from each other and that the entire print production is colored identically. The disadvantage of such an approach is that it can not be used to correct locally narrowly defined errors such as interference stripes and stenciling, because these errors occur locally in a limited manner, or can also occur at the boundary between two uses, so that several are adjacent to the boundary Benefits are affected. Since the method according to DE 39 25 533 A1 Only the tonal values of individual benefits over their entire respective surface can equalize, so that a correction of local flaw effects is not possible.
  • In view of the solutions known from the prior art as well as the indicated technical problem, the object of the invention is to locally correct machine-related coloring errors.
  • According to the invention, the object is achieved by a method for correcting local, machine-related color errors on rotary printing presses, in which the following method steps are performed:
    • Determination of the inking behavior of the printing units by means of test forms,
    • Detection of staining nonuniformities on the test forms and transfer of the data for staining nonuniformity to the prepress and
    • Modification of the Rasterertonwerte the Farbauszügc a printing form such that the Farbungsunleichförmigkeiten locally depending on the location of their occurrence in the printing on the printing forms or printing films are maintained and that the location of the correction on the surface of the respective imaged or to be exposed printing forms with the location of the Occurrence of the error in the print coincides.
  • The advantages resulting from the proposed solution according to the invention are primarily to be seen in the fact that in the finished printed product disturbing strips, the color drop in the printing direction and stenciling effects are no longer visually visible or only to a small extent. It is a consideration of the printing or
  • Dyeing behavior of the printing form machine-specific already in the prepress stage possible, so that the later adjusting nonuniformity effects in the color of the surface of the printing plate can be kept in the printing forme production and compensate for the later pressure. By means of the method proposed according to the invention, machine-specific properties can be maintained not only in global form but locally depending on the location of their occurrence as a function of the halftone tone values and thus significantly increase the quality of the printed product to be produced.
  • In an advantageous development of the method proposed according to the invention, the inking behavior of the printing units is determined by means of test forms for the maximum format. The determination for the maximum format offers the advantage of being able to use this as a reference or reference printed product and from this to be able to convert the determined inking irregularities to smaller formats.
  • According to an advantageous development of the method proposed according to the invention, in the case of inking irregularities determined independently of the printing unit, the inking non-uniformity of the rotary printing press can be ascertained on merely one printing unit. This offers the advantage that only one of several printing units must be selected, so that can be achieved in the calibration of a time advantage within the prepress by merely the evaluation of a printing unit. In a multi-color printing machine, for example, 4, 6 or 8 printing units connected in series in series, this represents a significant time advantage.
  • In an advantageous development of the method proposed according to the invention, the color separations of a printing form, be it in plate form or as a printing sleeve or a film, can be made depending on the subject in the case of image-dependent dyeing irregularities on the basis of the data of the raster image processor. Subject-dependent staining irregularities occur especially when areas with high halftone tone values and areas with extremely low halftone screen values are in close contact in the print. By means of the method proposed by the invention can not only the printing machine or printing unit-dependent behavior of the production of dyeing nonuniformities but also the coloring nonuniformities occurring due to the subject to be printed by extremely different raster tone values are taken into account.
  • With the method proposed according to the invention, the determined coloring characteristics of the printing units or of the individual printing units of a multicolour rotary printing machine can be transmitted in the form of a profile to the prepress.
  • The profiles can be transmitted in particular in tabular form, which makes their further processing easier in the increasingly digital pre-press.
  • Also conceivable is a transfer of the coloring characteristics in the form of amplitude, gradient, position in the picture etc.
  • Within the transferred profiles, their resolution is matched to the error gradients of the dyeing nonuniformities. The solution proposed according to the invention can be used to modify the halftone tone values when specifying the halftone color value fluctuations within the prepress stage during the printing plate production. Thus, a later to be used in the corresponding printing unit printing plate, whether in plate or in sleeve form, so prepared that the self-adjusting dyeing irregularities are kept. In addition, with digital equipment of the corresponding pre-press within the pre-press, the modification of the raster tone values during the imaging process in the digital printing form imaging process eg in computer-to-press (direct imaging) imaging in the printing press as well as in the digital exposure of films or printing plates.
  • The inking behavior of a multicolour rotary printing press, whose individual printing or finishing plants are connected in series, is sufficiently well known after evaluation of test prints on the basis of previous print jobs. The data available from test prints or already from the preceding print jobs for inking nonuniformities with regard to ink drop in the printing direction, self-adjusting stenciling effects depending on the ink coverage and the banding are coupled by means of the proposed method according to the invention with the data incurred in the printing forme production of each print job to be executed.
  • The inking nonuniformities resulting from the offset process are due to the general effect that, in this printing process, the production of the ink is continuous, but the color decrease of the ink film carrying surfaces within the printing unit is discontinuous. With the proposed method according to the invention, the machine-related errors in the production of printing form in the form of local Rasterertonwertveränderungen be kept so that they no longer in the print image to be created, which after passing through the substrate by a number of successive printing units in the overlaid printed image of multiple color separations produced or are only partially visible.
  • In the characterization, all the printing units of a multicolor rotary printing machine must be examined for the dyeing nonuniformities and the printing forms to be used in the respective printing units must be differently reserved with respect to the dyeing nonuniformities.
  • If the inking irregularities that occur are identical from one printing unit to the next, then only one printing unit can be selected for a 2, 4, 6, 8 printing units and one or more finishing units and representative of the other printing units with regard to the transfer of the data to the self-adjusting dyeing nonuniformity be transferred to the prepress. It is irrelevant whether the pre-press works in digital form or whether the individual printing forms or the color separations per printing unit are exposed or produced in a conventional manner with films.
  • If, on the other hand, the dyeing irregularities occur as a function of the product, as is the case, in particular, with the stenciling effect, then the corrections concerning the dyeing nonuniformities must also be made as a function of the image. In the printing form production in the prepress stage, however, the subject is sufficiently well known in the production of the color separations. Since the data for sujser production, i. are known from the imaging of the printing plate in the prepress, it can be determined from the inking irregularities of the printing units of a multicolor rotary printing machine, the corresponding corrections of Därbungsungleichförmigkeiten and taken into account in the production of the corresponding printing form per printing unit. In addition to the stenciling effects, other effects, e.g. the drop in color of the printed product to be produced be independent of the sujet. In this type of coloration non-uniformity, the corrections can be made globally, i. regardless of the print image. This means that in the corresponding printing plate production, the raster tone value generation seen over the print length compensates for the color drop that occurs in the case of the image independently of the printing length, i. holds.
  • The transfer of the coloring characteristics of the individual printing units of a multi-color rotary printing press, or the required corrections, can be transmitted to the prepress in the form of a profile of, for example, a multi-dimensional look-up table. It is conceivable to couple the profile to an ICC profile of the printing machine describing the coloring behavior to which the data to be transferred to the prepress can also be attached in the form of an appendix. If a transfer of the correction data to compensate for the occurring coloring irregularities per printing unit can be standardized, a further processing of this data within the prepress stage in the printing plate production is likewise to be carried out as standard and generates there substantially less effort. The resolution of the dyeing irregularities to be transferred in tabular form can be adapted to the respective occurring error gradients. In addition to the characterization of the dyeing non-uniformities by the error gradient, the color decay, stenciling, streaking effects can also be characterized in detail by occurring amplitude, gradients and the location of their occurrence. The more accurate and unambiguous the occurring coloration irregularities of the individual printing units of a rotary printing machine are known, and the more data to occur, with respect to the local occurrence of the errors are known, the more accurate can be held in the printing forme a compensation of these effects, which causes the occurring Effects per printing unit are hardly more or completely invisible later in the print.
  • The correction of the halftone tone values in screen printing processes can be carried out at the prepress stage at two points of the printing plate production. In the raster image processing of the image data, or in the imaging process in a digital plate or film imagesetter or in the computer-to-press process, both planar printing forms and sleeve-shaped printing plates can be exposed. With the method proposed according to the invention, it can be ensured that the location of the correction on the surface of the respective printing plates to be imaged or to be exposed coincides with the location of the occurrence of the error in the printing. Only in this way can occurring color irregularities be compensated locally, or maintained in the production of the corresponding color separation of a printing form, so that the self-adjusting effects of color waste or self-adjusting stencil effects compensate for stencilling-prone subjects. Advantageously, it is ensured that the machine states, i. Printing unit states are largely identical when recording the error image and the later printing, if they have influence on the fault location. If there is no influence on the location of the occurring error, it is irrelevant to take into account the respective prevailing machine states when taking the defect image and during subsequent printing.

Claims (10)

  1. Method of correcting local, machine-based inking errors in rotary printing presses comprising the following steps:
    • determining the inking behaviour of the printing units by means of test forms;
    • registering the inking non-uniformities on the test forms and transmitting the data about inking non-uniformity to the pre-press stage; and
    • modifying the screen tone values of the colour separations of a printing plate in such a way that the inking non-uniformities are compensated locally on the printing plates or films on the basis of the location of their occurrence in the print and that the correction location on the surface of the respective printing forms to be imaged or exposed coincides with the location of the occurrence of the error in the print.
  2. Method according to Claim 1,
    characterized in
    that the inking behaviour of the printing units is determined by means of test forms for the maximum format.
  3. Method according to Claim 1,
    characterized in
    that in the case of inking non-uniformities that occur independently of the printing unit, these inking non-uniformities are determined in one printing unit representative of all.
  4. Method according to Claim 1,
    characterized in
    that in the case of subject-dependent inking non-uniformities, the modification of the colour separations of a printing plate or film is carried out in a subject-dependent way based on the data, image data or colour separation data.
  5. Method according to Claim 1,
    characterized in
    that the determined inking characteristics of the printing press are transferred to the prepress department in the form of a profile or other inking standard.
  6. Method according to Claim 5,
    characterized in
    that the profile is transferred in tabular form.
  7. Method according to Claim 5,
    characterized in
    that the resolution of the profile corresponds to the error gradient of the inking non-uniformities.
  8. Method according to Claim 1,
    characterized in
    that the modification of the screen tone values are taken into account in the determination of the screen tone values for the production of the printing plate.
  9. Method according to Claim 1,
    characterized in
    that the modification of the screen tone values is carried out in the imaging operation in the digital platesetter or filmsetter or, in the case of DI (direct imaging), directly in the machine.
  10. Method according to Claim 1,
    characterized in
    that print jobs suitable as test forms are used for determining the inking non-uniformities.
EP20010117735 2000-08-31 2001-07-30 Method for correcting locally machine-produced colouring errors in rotary printing machines Expired - Fee Related EP1184176B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE10042680 2000-08-31
DE2000142680 DE10042680A1 (en) 2000-08-31 2000-08-31 Process for correcting local, machine-related staining errors on rotary printing presses

Publications (3)

Publication Number Publication Date
EP1184176A2 EP1184176A2 (en) 2002-03-06
EP1184176A3 EP1184176A3 (en) 2004-01-21
EP1184176B1 true EP1184176B1 (en) 2008-03-05

Family

ID=7654357

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010117735 Expired - Fee Related EP1184176B1 (en) 2000-08-31 2001-07-30 Method for correcting locally machine-produced colouring errors in rotary printing machines

Country Status (6)

Country Link
US (1) US6694883B2 (en)
EP (1) EP1184176B1 (en)
JP (1) JP5280598B2 (en)
AT (1) AT388018T (en)
CA (1) CA2353289C (en)
DE (2) DE10042680A1 (en)

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DE10213708A1 (en) * 2002-03-27 2003-10-23 Roland Man Druckmasch Print forme production method, especially for a rotary lithographic offset printer, whereby corrections for print cylinder deformation are applied by determination of correction values from differences in transfer curves
US7032508B2 (en) * 2003-03-21 2006-04-25 Quad/Tech, Inc. Printing press
WO2005029209A1 (en) * 2003-08-19 2005-03-31 Medigraph Gmbh Control method for production processes with color-relevant products and printing outcome control method
DE102005041179A1 (en) * 2005-08-31 2007-03-01 Man Roland Druckmaschinen Ag Typographic process e.g. color registering, regulating method for printing machine, involves determining pre-press based target value from pre-press data and under consideration of data about characteristic of sensor
US7586656B2 (en) * 2006-06-06 2009-09-08 E. I. Du Pont De Nemours And Company Process for producing optimised printing forms
DE102006029618A1 (en) * 2006-06-23 2007-12-27 Dieter Kirchner Test mold for determining the condition and setting of the dampening system of an offset printing press and method for adjustment
DE102006050552A1 (en) * 2006-10-26 2008-04-30 Man Roland Druckmaschinen Ag Method for compensation of local, coloring error caused by machine in rotary printing press, particularly sheet-fed offset printing machine, involves arranging printing blocks on plate or form cylinders
EP1916100B1 (en) * 2006-10-26 2014-03-05 Heidelberger Druckmaschinen Aktiengesellschaft Printing plate generation for anilox printing presses
DE102008031735B4 (en) 2007-07-10 2019-11-07 Heidelberger Druckmaschinen Ag Gray balance correction of a printing process
DE102008007326A1 (en) * 2008-02-02 2009-08-06 Manroland Ag Method for printing print substrate, involves generating print job dependent raster data in raster image processor on basis of print job dependent image data of pre-press, where computerized stimulation is carried out
DE102009046594A1 (en) * 2009-11-10 2011-05-12 Manroland Ag Method for controlling a printing process
JP5505636B2 (en) 2010-06-18 2014-05-28 コニカミノルタ株式会社 Image processing device
DE102019200185A1 (en) 2019-01-09 2020-07-09 Heidelberger Druckmaschinen Ag Color compensation in offset printing

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DE3925533C2 (en) * 1989-08-02 1995-08-17 Krause Biagosch Gmbh Process for the production of printing forms
JP2824334B2 (en) * 1990-12-27 1998-11-11 三菱重工業株式会社 Automatic color tone controller for printed materials
EP0505323B2 (en) * 1991-03-21 2001-11-07 Maschinenfabrik Wifag Method of adjusting the screendot sizes of a rotary offset printing machine
DE4328026A1 (en) * 1993-08-20 1995-03-09 Roland Man Druckmasch Communication method and system for computer-aided printing
DE4334712A1 (en) * 1993-10-12 1995-04-13 Heidelberger Druckmasch Ag Reproduction system
DE19506425B4 (en) * 1995-02-24 2004-11-18 Heidelberger Druckmaschinen Ag Offset printing process
US5903712A (en) * 1995-10-05 1999-05-11 Goss Graphic Systems, Inc. Ink separation device for printing press ink feed control
EP0770480B1 (en) * 1995-10-25 2001-12-19 Heidelberger Druckmaschinen Aktiengesellschaft Printing press with register control system
CA2236897A1 (en) * 1997-05-15 1998-11-15 Presstek, Inc. Distributed imaging and control architecture for digital printing presses and platesetters
DE19822662C2 (en) * 1998-05-20 2003-12-24 Roland Man Druckmasch Process for color reproduction on an image data oriented printing machine
DE19844495B4 (en) * 1998-09-29 2005-04-07 Man Roland Druckmaschinen Ag Method for color calibration by means of color management for a digitally controllable printing press with a rewritable printing form
US6220157B1 (en) * 1999-03-23 2001-04-24 Paper Converting Machine Company Printing press with in-line central impression cylinders

Also Published As

Publication number Publication date
EP1184176A2 (en) 2002-03-06
CA2353289A1 (en) 2002-02-28
AT388018T (en) 2008-03-15
US20020043172A1 (en) 2002-04-18
DE50113682D1 (en) 2008-04-17
JP2002113842A (en) 2002-04-16
DE10042680A1 (en) 2002-03-14
JP5280598B2 (en) 2013-09-04
US6694883B2 (en) 2004-02-24
CA2353289C (en) 2008-12-30
EP1184176A3 (en) 2004-01-21

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