EP3851282A1 - Procédé de fonctionnement d'une machine à imprimer offset - Google Patents

Procédé de fonctionnement d'une machine à imprimer offset Download PDF

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Publication number
EP3851282A1
EP3851282A1 EP20152247.1A EP20152247A EP3851282A1 EP 3851282 A1 EP3851282 A1 EP 3851282A1 EP 20152247 A EP20152247 A EP 20152247A EP 3851282 A1 EP3851282 A1 EP 3851282A1
Authority
EP
European Patent Office
Prior art keywords
color
measurement
printing
paper white
zone
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.)
Granted
Application number
EP20152247.1A
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German (de)
English (en)
Other versions
EP3851282B1 (fr
Inventor
Jan Hänel
Peter Hartmann
Andreas Walser
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.)
Manroland Goss Web Systems GmbH
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Manroland Goss Web Systems GmbH
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Publication date
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Priority to EP20152247.1A priority Critical patent/EP3851282B1/fr
Publication of EP3851282A1 publication Critical patent/EP3851282A1/fr
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Publication of EP3851282B1 publication Critical patent/EP3851282B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/04—Ducts, containers, supply or metering devices with duct-blades or like metering devices
    • B41F31/045—Remote control of the duct keys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0027—Devices for scanning originals, printing formes or the like for determining or presetting the ink supply
    • 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
    • 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 operating an offset printing machine.
  • An offset printing machine has several printing units. Each printing unit of an offset printing machine has an inking unit, a dampening unit, a forme cylinder and a transfer cylinder. At least one printing forme is arranged on the forme cylinder of the respective printing unit.
  • the respective printing form can be a printing plate. This is why forme cylinders are also referred to as plate cylinders.
  • At least one transfer form, in particular a rubber blanket, is arranged on the transfer cylinder. This is why transfer cylinders are also referred to as rubber cylinders.
  • Printing ink can be applied via the inking unit of a printing unit and dampening solution via the dampening unit of a printing unit to the or to each printing form positioned on the forme cylinder.
  • the forme cylinder rolls on the transfer cylinder.
  • the transfer form arranged on the transfer cylinder takes over the printing ink from the form cylinder and transfers it to a printing material to be printed.
  • the process inks cyan, magenta, yellow and black are applied to the substrate.
  • the process inks of cyan, magenta, yellow, and black are also known as process colors. If necessary, further special printing inks can be applied to a printing material during printing.
  • the inking unit of a printing unit of an offset printing machine has several ink zones. In each ink zone, individual ink zones can be applied to the or each printing form of the forme cylinder and thus to the substrate to be printed. It is possible that only a subset of the process printing inks cyan, magenta, yellow and black is applied to the printing material during printing.
  • the dampening unit of a printing unit has at least one dampening zone.
  • a damp zone typically covers several ink zones. In the damp zones, dampening solution can be applied individually to the respective printing form.
  • the exact dosage of the printing ink and the dampening solution is of decisive importance for a high print quality. If printing ink and dampening solution are not precisely dosed, scumming, which adversely affects the printing quality, can be detected on the printing material. Toning is the coloring or printing of areas of the printing material that are outside the actual print image and do not correspond to the print image.
  • the present invention is based on the object of creating a novel method for operating an offset printing press.
  • the method according to the invention comprises at least the following steps: Full tone measuring fields printed on the printing material in color zones of the printing material in at least one of the process printing inks cyan, magenta, yellow and black are measured with a sensor, with a full tone measuring field being measured with the sensor in each color zone of the printing material for the respective printed process printing ink in such a way that for the respective full tone measurement field, a main density measurement value and several secondary density measurement values can be recorded in one measurement color space.
  • white measuring areas arranged adjacent to the full tone measuring areas are also measured with the sensor, with several paper white density measured values being recorded in the measuring color space for each white measuring area.
  • the white measuring field with the largest paper white density measured value is determined from all paper white density measured values of all white measuring fields of the respective ink zone, whereby the paper white density measured values of the white measuring field with the largest paper white density measured value are stored for the respective ink zone.
  • a course of a paper white value across all color zones is determined from the paper white density measurement values stored for all ink zones of the printing material in the respective white measurement fields with the largest paper white density measurement value in the respective ink zone.
  • the paper white density measurement values of the respective white measurement field with the largest paper white density measurement value are corrected by the paper white value determined for the respective color zone and the respective color of the measurement color space or measurement color space color.
  • a quotient is formed from the minimum and maximum corrected paper white density measured value for the corrected paper white density measured values of the respective white measuring field with the largest paper white density measured value. Depending on this quotient, a conclusion is drawn as to whether there is undesirable toning in the respective ink zone.
  • a tinting of at least one of the process printing inks cyan, magenta and yellow in the respective color zone is concluded.
  • this quotient of the respective color zone is greater than the first limit value, either a toning of the process printing ink black in the respective color zone or no toning in the respective color zone is concluded, so that if the corrected paper white density measurement value for black continues to be available Measurement color space of the respective color zone is greater than a second limit value, it is concluded that the process printing color black in the respective color zone is toning, whereas if the corrected paper white density measurement value for Black in the measurement color space of the respective color zone is smaller than the second limit value, no toning in the respective color zone is concluded.
  • This procedure is particularly preferred in order to recognize toning and to assign it to the corresponding process printing ink.
  • Fig. 1 shows a section from an offset web printing machine in the area of a printing tower 10, the printing tower 10 being formed from two printing units 11 positioned one above the other.
  • Each of the printing units 11 has four Printing units 12.
  • Each printing unit 12 comprises a forme cylinder 13, a transfer cylinder 14, an inking unit 15 and a dampening unit 16.
  • the forme cylinders 13 are also referred to as plate cylinders and the transfer cylinders 14 are also referred to as rubber cylinders.
  • a printing material 17 to be printed is also shown.
  • the printing material 17 to be printed is supported by the in Fig. 1
  • the printing units 11 of the printing tower 12 shown are printed on both sides with the process printing inks cyan C, magenta M, yellow Y and black K.
  • Those printing units 12 that print the process color cyan C are shown in FIG Fig. 1 marked as printing units 12c.
  • the printing units 12 which print the process color magenta M are identified as printing units 12 M.
  • the printing units 12 Y print the process printing color yellow Y and the printing units 12 K print the process printing color black K.
  • the invention is preferably used in offset printing machines that print all process printing inks cyan C, magenta M, yellow Y and black K on substrate 17, the invention can also be used in offset printing machines that exclusively use a subset of these process printing inks, namely Print at least one of the process printing inks cyan C, magenta M, yellow Y and black K on the printing substrate 17. In the following description it is assumed that all four process printing inks cyan C, magenta M, yellow Y and black K are printed on the printing material 17.
  • adjacent transfer cylinders 14 of adjacent printing units 12 each form a printing nip through which the printing material 17 to be printed is conveyed.
  • Fig. 2 shows a printing unit 12 of a printing unit 11 in greater detail. So are in Fig. 2 Again, the forme cylinder 13, the transfer cylinder 14, the inking unit 15 and the dampening unit 16 of a printing unit 12 are shown. At least one printing forme is arranged on the forme cylinder 13. The inking unit 16 is used to apply a respective printing ink 18 to the or each printing form positioned on the forme cylinder 13, the printing ink 18 being kept ready in an ink fountain 19 of the inking unit 15.
  • Fig. 2 shows a printing unit 12 of a printing unit 11 in greater detail. So are in Fig. 2 Again, the forme cylinder 13, the transfer cylinder 14, the inking unit 15 and the dampening unit 16 of a printing unit 12 are shown. At least one printing forme is arranged on the forme cylinder 13. The inking unit 16 is used to apply a respective printing ink 18 to the or each printing form positioned on the forme cylinder 13, the printing ink 18 being kept ready in an ink fountain 19 of the inking unit 15.
  • a ductor roller 20 with the interposition of a fountain roller 21 draws printing ink 18 from the ink fountain 19, whereby an amount of ink transferred per ink zone of the inking unit 15 from the ink fountain 19 to the ductor roller 20 is set via ink zone adjusting elements 22 designed as ink slides or ink knife.
  • the printing ink reaches the or each printing form positioned on the forme cylinder 13 via further inking unit rollers 23, 24.
  • the inking unit rollers 24, which roll on the forme cylinder 13, are also referred to as inking application rollers 24.
  • the ink zone adjusting elements 22 can be adjusted via actuators 25 in order to adjust the amount of ink that reaches the ductor roller 20 for each ink zone.
  • the dampening unit 16 has several dampening unit rollers 26, 27, the dampening unit roller 27 rolling on the forme cylinder 13 also being referred to as the dampening solution application roller. Via a dampening solution metering unit 28, dampening solution is applied to one of the dampening unit rollers 26 and, starting from this dampening unit roller, is then conveyed via the further dampening unit rollers 26, 27 in the direction of the forme cylinder 13 in order to ultimately not only print ink but also dampening agent on the or each printing form positioned on the forme cylinder 13 to apply.
  • At least one transfer form is arranged on the transfer cylinder 14.
  • the form of transfer is done by the printing ink from the or each printing form positioned on the forme cylinder 13 and transfers the same onto the printing material 17 to be printed.
  • full-tone measuring fields 29 are printed in the color zones of the printing material 17, which roughly match the color zones of the printing units 12, namely full-tone measuring fields 29 in the process printing inks cyan C, magenta M, yellow Y and black K, which are shown in Fig. 3 with the reference numerals 29 C , 29 M , 29 Y and 29 K are identified.
  • These full-tone measurement fields 29 are measured with the aid of a sensor 30, in particular designed as a camera, during printing on the printing press, with one main density measurement value and several secondary density measurement values being recorded in a measurement color space of the sensor 30 for each full-tone measurement field 29.
  • the main density is the color density of a full-tone field, which is measured with the main filter or the main light associated with the respective printing ink.
  • the main densities are thus obtained by comparing the color densities for the color cyan C with a red filter or with red light, for the color magenta M with a green filter or with green light, for the color yellow Y with a blue filter or with blue Light and for the color black K with a visual density filter or with white light.
  • the color densities of a full-tone field are referred to as secondary densities, which are determined in the case of, for example, 4-color printing with the color filters or colors of the respective light that differ for the measurement of the main densities, such as for example when determining the color cyan C with green, blue and visual density filters .
  • a main density DV C, r for the measurement color space color red r and secondary densities DV C, b , DV C, g and DV C, v for the measurement color space colors blue b, green g and black v are recorded for the full tone measurement field 29c of the process printing color cyan C.
  • a main density DV M, g for the measuring room color green g and secondary densities DV M, r , DV M, b and DV M, v for the measuring room colors red r, blue b and black v are determined for the full tone measuring field 29 M of the process printing ink magenta M.
  • a main density DV Y, b for the measuring color space color blue b and secondary densities DV Y, r , DV Y, g and DV Y, v for the measuring color space colors red r, green g and black v are determined .
  • a main density DV K, v for the measurement color space color black v and secondary densities DV K, r , DV K, g and DV K, b for the process color space colors red r, green g and blue b are determined for the full tone measuring field 29K of the process printing color black K.
  • white measurement fields 31 are measured via the sensor 30, with paper white density measurement values also being recorded for each white measurement field 31 in the measurement color space, namely in the measurement color space colors red, green, blue and black.
  • the white measuring fields 31 are positioned adjacent to the full tone measuring fields 29 on the printing material 17.
  • full-tone measuring fields 29 in the process printing inks cyan C, magenta M, yellow Y and black S and, in addition to these full-tone measuring fields 29, white measuring fields 31 are detected with the aid of the sensor 30 in order to be able to use the sensor 30 for each of these measuring fields, i.e. both for the full-tone measuring fields 29 and for the white tone measuring fields 31 to acquire density measured values in the measuring color space colors red r, green g, blue b and black v of the measuring color space of the sensor 30, namely one main density measured value and several secondary density measured values for the full tone measuring fields 29 and several paper white density measured values for the white fields 31.
  • That white measurement field 31 with the largest paper white density measurement value is determined from all paper white density measurement values of all white measurement fields 31 of the respective color zone.
  • the measured paper white density values of the white measuring field 31 with the largest paper white density measured value are stored or processed further.
  • the paper white density measurement values of the other white measurement fields 31 of the respective color zone of the printing material 17 can be discarded.
  • the respective white measurement field 31 with the largest paper white density measurement value is determined, with the paper white density measurement values for each color zone being stored and processed in the measurement color space colors of the measurement color space of the sensor 30 of this white measurement field with the largest paper white density measurement value.
  • Fig. 4 the paper white density measurement values y of the respective white measurement field 31 of the respective color zone z with the largest paper white density measurement value are plotted for a large number of ink zones z, namely in the measurement color space colors r red, g green, b blue and v black of the measurement color space of the sensor 30.
  • a polynomial regression for the measurement color space colors red r, green g, blue b and black v of the measurement color space is then used to determine a course of a paper white value over all color zones z, preferably with a recursive polynomial regression for a polynomial of the 2nd degree.
  • the 2nd order polynomials determined for the individual measurement color space colors via the recursive polynomial regression are identified by the reference numerals 32, the indices r, b, g, v in turn indicating the measurement color space colors.
  • the regression using a polynomial of the 2nd degree allows not only inclinations but also deflections of a measuring system geometry to be taken into account.
  • both white measuring fields 31 and full tone measuring fields 29 are measured with the sensor 30.
  • a coupling matrix A is preferably formed from the primary and secondary densities determined during the measurement of the full-tone measuring fields 29 for the process colors cyan C, magenta M, yellow Y and black K, which is used to convert the measurement color space color densities into process printing ink color densities.
  • Such a standardized coupling matrix is shown below.
  • A. 1 d M. , r d Y , r d K , r d C. , G 1 d Y , G d K , G d C. , b d M. , b 1 d K , b d C. , v d M. , v d Y , v 1
  • a mn specifies the element in row m and column n.
  • the normalized densities d of the full tone measuring fields 29 result from the measured main densities DV and secondary densities DV of the full tone measuring fields 29 as follows:
  • the main densities DV and secondary densities DV are standardized to the amount of the respective main density, so that the main densities are indicated by 1 in the coupling matrix.
  • the normalized densities are indicated with ad, the first letter of the index indicating the process printing color and the second letter of the index indicating the measurement color space color for the respective secondary density.
  • D rgbv (z) is the paper white density measurement values y stored for the respective color zone z of the printing material 17 in the measurement color space colors of the respective white measurement field 31 with the largest paper white density measurement value, which are corrected by the paper white value of the respective color zone determined via the polynomial regression.
  • a course ⁇ of a paper white value over all color zones is determined via a polynomial regression for the measurement color space colors red r, green g, blue b and black v.
  • ⁇ i ( z ) is the paper white value determined via the polynomial regression for the respective color space (i is one of the colors r, g, b or v).
  • the paper white density measurement values y of the respective white measurement field 31 with the largest paper white density measurement value are corrected by the paper white value determined for the respective color zone and the respective color measurement space color.
  • a block 34 of the signal flow diagram of FIG Fig. 5 visualizes the above-described conversion of the paper white densities in the measurement color space into paper white densities of the process printing inks according to equation (6).
  • a block 35 of the signal flow diagram of FIG Fig. 5 visualizes the formation of the quotient according to equation (9) above.
  • a block 36 it is checked whether or not the quotient q of the respective ink zone is smaller than a first limit value for the respective color zone of the printing material 17. Then, when it is determined in block 36 that the quotient q of the respective color zone of the printing material 17 is less than the first limit value, a branch is made from block 36 to block 37, with toning in at least one of the process printing inks cyan in block 37 , Magenta and yellow in the respective color zone of the printing material 17 is closed.
  • a block 41 it is checked again whether toning was previously determined in the respective color zone, and then, if toning was determined, whether toning was determined for black or for one of the process printing inks cyan, magenta, yellow.
  • D. C. C. rgbv - K CMYK
  • D. M. M. rgbv - K CMYK
  • D. Y Y rgbv - K CMYK
  • D. K K rgbv
  • a dampening solution supply is increased in the printing unit 12 printing the respective process printing ink, at least for this ink zone, in order to counteract the toning. This is explained below with reference to the timing diagram of FIG Fig. 6 described.
  • a course of a paper white density Dc for the process printing ink cyan of an ink zone over time t is shown as an example over time t, specifically with curve course 45.
  • the above procedure for increasing and reducing the dampening solution supply is preferred in order to counteract scumming, but is of an exemplary nature. If toning of a process printing ink is recognized in a respective ink zone, then the dampening solution supply is increased in the printing unit that prints this process printing ink, at least for this ink zone, in particular in a step-like manner by a first step height. This continues until the toning of the process printing ink is no longer recognized in the respective ink zone.
  • the previously increased dampening solution supply is reduced, in particular in steps by a second step height, which is smaller than the first step height during the increase.
  • the procedure is preferably such that the last stage of increasing the dampening solution supply is reversed.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP20152247.1A 2020-01-16 2020-01-16 Procédé de fonctionnement d'une machine à imprimer offset Active EP3851282B1 (fr)

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EP20152247.1A EP3851282B1 (fr) 2020-01-16 2020-01-16 Procédé de fonctionnement d'une machine à imprimer offset

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EP3851282B1 EP3851282B1 (fr) 2024-05-08

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008041426A1 (de) * 2008-08-21 2010-02-25 Koenig & Bauer Aktiengesellschaft Verfahren zur Verwendung in einer Druckmaschine mit mindestens einem Farbwerk

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008041426A1 (de) * 2008-08-21 2010-02-25 Koenig & Bauer Aktiengesellschaft Verfahren zur Verwendung in einer Druckmaschine mit mindestens einem Farbwerk

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