EP4135983A1 - Verfahren zum kontrollieren der qualität von druckprodukten - Google Patents
Verfahren zum kontrollieren der qualität von druckproduktenInfo
- Publication number
- EP4135983A1 EP4135983A1 EP21736301.9A EP21736301A EP4135983A1 EP 4135983 A1 EP4135983 A1 EP 4135983A1 EP 21736301 A EP21736301 A EP 21736301A EP 4135983 A1 EP4135983 A1 EP 4135983A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- printed
- determined
- distance
- printing
- images
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 104
- 238000007639 printing Methods 0.000 claims abstract description 112
- 238000004519 manufacturing process Methods 0.000 claims abstract description 54
- 238000007689 inspection Methods 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims description 32
- 239000010959 steel Substances 0.000 claims description 32
- 238000007645 offset printing Methods 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 12
- 238000007650 screen-printing Methods 0.000 claims description 12
- 238000012935 Averaging Methods 0.000 claims description 6
- 230000001419 dependent effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 description 10
- 239000000758 substrate Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000007648 laser printing Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F11/00—Rotary presses or machines having forme cylinders carrying a plurality of printing surfaces, or for performing letterpress, lithographic, or intaglio processes selectively or in combination
- B41F11/02—Rotary presses or machines having forme cylinders carrying a plurality of printing surfaces, or for performing letterpress, lithographic, or intaglio processes selectively or in combination for securities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N3/00—Preparing for use and conserving printing surfaces
- B41N3/003—Preparing for use and conserving printing surfaces of intaglio formes, e.g. application of a wear-resistant coating, such as chrome, on the already-engraved plate or cylinder; Preparing for reuse, e.g. removing of the Ballard shell; Correction of the engraving
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2233/00—Arrangements for the operation of printing presses
- B41P2233/10—Starting-up the machine
- B41P2233/13—Pre-registering
Definitions
- the invention relates to a method for checking the quality of printed products according to claim 1.
- DE 102004 019 978 B3 discloses a method for assessing the quality of a printed matter produced by a printing press, wherein within the selected number of copies, an error of a specific error type or a specific characteristic detected on a copy is compared to at least one of the same or an error detected in another specimen is assessed taking into account a relation between at least one of the detected error types and one of the characteristics of the detected error.
- EP 3 539 777 A1 discloses a method for increasing the print quality using a printing position correction of printing units in a printing press using the determination of actual and target position values and a difference value characterizing the deviation.
- the printed image of a security element can be executed, for example, in screen printing, offset printing, indirect letterpress, letterpress, digital printing, inking or blind embossing intaglio printing, with combinations of printing methods also being able to be used.
- the present invention is primarily in the technical field of industrial production of printed products to be designed as a security document, in particular as a banknote.
- the production of such printed products i. i.e. R. several different printing processes involved, which are carried out either in a coherent production system or one after the other in successive production steps by means of separate printing machines that are arranged spatially separate from one another.
- These printed products usually have a number of different printed images, of which, for example, a first printed image is printed in an intaglio printing process and a second printed image in an offset printing process and a third printed image in a screen printing process.
- Each of these print images is i. i.e. R.
- the printing material used is preferably a printing material in the form of a printed sheet.
- B. made of paper, in particular a special paper for security documents, or consists of a polymer material.
- Such printed products usually have several different security features such.
- These security features are either already created in the printing material Paper mill or in the print shop that prints the printing material in machines other than the printing machines that print the print images or applied to the printing material.
- print register The geometric arrangement of the print images printed in a specific printed product in several different printing processes on the surface to be printed of this printed product at a distance from each other in their respective relationship to one another and/or the geometric arrangement of one of these printed images in relation to at least one in or on the surface to be printed on Security feature attached to the printed product and/or the geometric arrangement of one of these printed images relative to an edge delimiting the surface of this printed product to be printed is referred to below as print register.
- the respective print register for the print images involved in the production of the print product in question is determined by specifying a distance dimension with an associated tolerance for the respective intended geometric arrangement of these print images on the surface of this print product to be printed. At least following the production run, but preferably already during ongoing production of the print product in question, compliance with the previously defined print register is to be checked in order to obtain a statement regarding the quality of the print product in question produced.
- the quality of the generically produced printed products can, for. B. be affected by one of the printing processes used. So deformed z. B. a steel intaglio printing process, which can be an intaglio printing process or an intaglio printing process, the printed sheet in a very clearly recognizable way. This can have a particularly negative effect on the print register and thus on the quality of the generically produced printed products if the sheet in question has previously been printed with at least one other printing method, e.g. B. has been pre-printed with an offset printing process and / or with a screen printing process. This deformation caused by the intaglio printing process is only partially predictable. It depends on various parameters, such as B.
- the material of the printing sheet used or the printing press in the intaglio printing machine or the printed image itself encounter the fact that the print images to be printed using the offset printing process are partially pre-distorted in a pre-production stage in order to take into account the expected deformation caused by the intaglio printing process.
- the results that can be achieved in this way are not always fully satisfactory.
- the printing forms used in the steel engraving process ie the steel engraving plates
- are subject to wear and tear processes, e.g. B. in the form of an elongation, resulting in a shift of a printed image z. B. can lead to a border or an edge of the sheet in question and / or to a shift of different print images to each other.
- the various printing processes involved in the production are used one after the other, as mentioned, either in a production system that has several printing machines combined or in separate printing machines that are spatially separated from one another.
- the resulting print register is thus also decisively dependent on a respective sheet feed and/or a respective sheet feed on the relevant printing press executing the respective printing process.
- the pressure register is also set by z. B. from the papermaking resulting causes affected such. B. by a deviation from an intended position of the cut of a contact edge or side edge of the sheet in question.
- Printed sheets are generally cut from a web of material, preferably from a web of paper, with a plurality of printed sheets being arranged next to one another in this web of material transversely to its longitudinal direction.
- the print register resulting later in the execution of the printing process can also be caused by the earlier position of the relevant Printed sheet in the web of material in question can be influenced because a printed sheet cut from the middle of the web behaves differently in the subsequent printing process than a printed sheet previously arranged at one of the edges of the web.
- the respective moisture content of the substrate also has an effect on the print register, especially with print sheets made of paper.
- the print register is checked and appropriately set up and/or corrected by assessing a printed image to a sheet edge and/or from printed image to printed image and/or from a printed image to a security feature.
- tolerances are allowed between the individual involved in the production of the generic printed products printing methods that go far beyond the level of those tolerances that z. B. have the four printing colors of the CMYK offset printing process to each other.
- the color register and/or the register i. i.e. R. only a few hundredths of a millimeter are tolerable, whereas between the individual printing processes involved in the production of the generic printed products, several tenths of a millimeter are not a problem.
- the invention is now based on the object of creating a method for checking the quality of printed products, these printed products being produced in a specific production run using a plurality of printing machines in succession.
- the advantages that can be achieved with the invention are, in particular, that the informative value of a determined print register is improved, in order to be able to identify a trend in the print register that arises in particular during production during the production of the generic printed products and to be able to understand longer-term drift effects in the print register and then to be able to counteract them .
- FIG. 1 shows a banknote with a plurality of printed images arranged at a distance from one another
- FIG. 2 shows a representation of results obtained according to the invention on a monitor of a display device.
- FIG. 1 shows, by way of example and only schematically, a printed product 01 in the form of a security document 01, in particular a banknote 01, with printed images 03 arranged at a distance from one another; 04; 06, these printed images 03; 04; 06 have each been printed one after the other using different printing processes.
- the printed image with the reference number 03 in an offset printing process and the several e.g. B. three print images each with the reference number 04 each in a steel intaglio printing process and the print image with the reference numeral 06 have been printed in a screen printing process.
- reference lines indicated by dashed lines were defined in FIG.
- the inspection system prints two printed images 03; 04; 06 is selected to form a pair of print images, with the respective pair of print images z.
- B. from the inspection system ie preferably by a program running in particular in a digital processing unit of this inspection system, one for the respective distance A; B; C; D of the selected print images fixed distance is assigned.
- the respective distance is provided with a tolerance in the inspection system by its computing unit before starting the specific production.
- the respective tolerance is or will be defined in each case as a function of the printing process used in the pair of printed images in question.
- the respective permissible tolerances can be in a range z. B. between 0.3 mm and 3 mm.
- the quality of the printed products 01 produced is now controlled by preferably inline, i. H. during an ongoing production using the processing unit of the inspection system, at least for a subset taken from the set of all printed products 01 produced consecutively in the specific production run, a value for the respective distance A for the same pair of printed images of these printed products 01; B; C; D between the print images 03; 04; 06 is preferably determined programmatically. Then the currently determined value of the relevant distance A; B; C; D with that for this distance A; B; C; D specified distance dimension compared taking into account the associated tolerance and taking into account the associated tolerance a deviation of the currently determined value of the relevant distance A; B; C; D determined from its specified distance.
- the processing unit changes a setting of the printing press in question that affects the ongoing production process, or at least initiates such a change so that printed products 01 subsequently produced by this printing press again correspond to the desired quality.
- the printing methods used to print the printed images 03; 04; 06 uses a steel intaglio printing method and an offset printing method and a screen printing method, wherein a steel intaglio printing machine is used to carry out the intaglio printing method and an offset printing machine is used to carry out the offset printing method and a screen printing machine is used to carry out the screen printing method.
- the printed products 01 can be produced in a single pass in a production system that has a plurality of combined printing presses in a continuous manner, or in successive production steps using separate printing presses that are spatially separate from one another.
- the processing unit of the inspection system in question consists of several, e.g. B. from 50 to 200 printed products 01 consisting of the quantity of all printed products 01 produced consecutively in the specific production run, in the case of at least one identical print image pair of several of these printed products 01 belonging to this partial quantity, the current value for the respective distance A; B; C; D between the respective print images 03; 04; 06 is determined, with the computing unit using these currently determined values for the distances A; B; C; D a mean value is determined, with a deviation of the mean value determined from its value for this distance A; B; C; D specified distance is determined.
- the processing unit of the inspection system calculates a current value for the respective distance A; B; C; D between the respective print images 03; 04; 06 is determined, with the computing unit using these currently determined values for the distances A; B; C; D a first mean value is determined for each subset, with a second mean value being determined by the computing unit from these first mean values, with the computing unit determining a deviation of the second mean value determined from its value for this distance A; taking into account the associated tolerance; B; C; D specified distance is determined.
- a currently determined value of the relevant distance A; B; C; D checked for plausibility and excluded from averaging if there is insufficient plausibility.
- the computing unit prior to the respective averaging by the computing unit in the respective subset for the respective distance A; B; C; D between the respective print images 03; 04; 06 currently determined extreme values, i. H. at least one currently determined minimum value and/or at least one currently determined maximum value are eliminated.
- the computing unit can also calculate a standard deviation from the respective mean value.
- Printed products 01 embodied as security documents 01 or as banknotes 01 are often produced in multiples on a printed sheet, so that the printed products 01 in question are each arranged in a plurality of rows and columns on the printed sheet in question.
- the averaging methods described above are preferably used for those printed products 01 that are located at the corners of the sheet in question are arranged, since at these positions with the greatest deviations from the currently determined value of the distance A; B; C; D is to be calculated from the specified distance, taking into account the associated tolerance. This is where the disruptive influences mentioned above are most noticeable.
- the processing unit can also calculate an elongation of the at least one printing forme used in one of the printing processes, in particular an elongation of the at least one steel engraving plate executing the steel intaglio printing process.
- the computing unit calculates the deviation of the respective currently determined value of the relevant distances A; B; C; D from its specified distance measure or the deviation of the determined mean value from its for this distance A; B; C; D specified distance measure or the deviation of the second mean value determined from its for this distance A; B; C; D specified distance is determined selectively in each case.
- the respective deviation and/or the respective first and/or second mean value is thus determined separately by the computing unit for each relevant steel intaglio printing plate.
- the determined deviation of the respective currently determined value of the relevant distances A; B; C; D from its specified distance and/or the determined deviation of the determined mean value from its for this distance A; B; C; D specified distance measure and/or the determined deviation of the determined second mean value from its for this distance A; B; C; D specified distance become e.g. B. controlled by the processing unit of the inspection system, preferably displayed in each case on a monitor 07 of a display device.
- FIG. 2 shows an example of a representation of results obtained according to the invention on the monitor 07 of the display device.
- a z. B Cartesian coordinate system is shown, in which each with reference to the origin of this coordinate system, the respective deviations of the respective currently determined values of at least one of the relevant distances A; B; C; D of the associated fixed distance measure and/or the determined deviations of the determined mean value from its for this distance A; B; C; D specified distance measure and/or the determined deviation of the determined second mean value from its for this distance A; B; C; D specified distance are displayed in particular graphically.
- FIG. 2 shows, by way of example, the respective deviations of the respective respectively currently determined values of three distances A determined by the computing unit; B; C between a print image 03 printed in an offset printing process and a print image 04 printed in a steel intaglio printing process by the respectively associated specified spacing.
- These three distances A; B; C result e.g. B. from the use of three in the same production z.
- generic printed products 01 are often produced in multiples on a printed sheet.
- the representation of FIG. 2 relates z. B. a printed product 01, which is arranged in a corner position on the printed sheet in question.
- Values generated by the first steel intaglio printing plate P1 are shown in FIG. B. by a square, generated by the second steel intaglio printing plate P2 values z. B. by a rhombus and values generated by the third steel intaglio printing plate P3, each z. B. represented by a triangle.
- the permissible distance for the respective dimension is used tolerance shown.
- This representation indicates a tolerance range, which in this example extends from the coordinate value -0.5 to the coordinate value +0.5 both on the abscissa and on the ordinate of the coordinate system shown, whereby a permissible tolerance of ⁇ 0.5mm is displayed.
- Values and/or deviations determined by the computing unit that are to be displayed outside of this tolerance range are e.g. B. displayed in a different color than the values to be displayed within the permissible tolerance range.
- this representation makes it easy to see a trend in the print register that occurs in the production run.
- further parameters can be calculated, e.g. B. a change in length of the printing forms, in particular the steel intaglio printing plates P1; P2; P3.
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Mechanical Engineering (AREA)
- Printing Methods (AREA)
- Image Processing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020123472.4A DE102020123472A1 (de) | 2020-09-09 | 2020-09-09 | Verfahren zum Kontrollieren der Qualität von Druckprodukten |
PCT/EP2021/067489 WO2022053195A1 (de) | 2020-09-09 | 2021-06-25 | Verfahren zum kontrollieren der qualität von druckprodukten |
Publications (2)
Publication Number | Publication Date |
---|---|
EP4135983A1 true EP4135983A1 (de) | 2023-02-22 |
EP4135983B1 EP4135983B1 (de) | 2024-04-10 |
Family
ID=76708232
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21736301.9A Active EP4135983B1 (de) | 2020-09-09 | 2021-06-25 | Verfahren zum kontrollieren der qualität von druckprodukten |
Country Status (4)
Country | Link |
---|---|
US (1) | US11760082B2 (de) |
EP (1) | EP4135983B1 (de) |
DE (1) | DE102020123472A1 (de) |
WO (1) | WO2022053195A1 (de) |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004019978B3 (de) | 2004-04-23 | 2005-08-04 | Koenig & Bauer Ag | Verfahren zur Beurteilung einer Qualität einer von einer Druckmaschine produzierten Drucksache |
DE102004038542A1 (de) | 2004-08-06 | 2006-02-23 | Giesecke & Devrient Gmbh | Datenträger mit Sicherheitselement und Verfahren zu seiner Herstellung |
DE102005060441A1 (de) * | 2005-12-17 | 2007-06-21 | Man Roland Druckmaschinen Ag | Bogendruckmaschine |
JP4958489B2 (ja) * | 2006-06-30 | 2012-06-20 | 株式会社キーエンス | レーザ加工装置、レーザ加工条件設定装置、レーザ加工条件設定方法、レーザ加工条件設定プログラム |
JP6015189B2 (ja) * | 2011-08-16 | 2016-10-26 | 株式会社リコー | 画像検査装置、画像形成装置、画像検査方法及び画像形成システム |
EP3246160A1 (de) * | 2016-05-19 | 2017-11-22 | KBA-NotaSys SA | Messung und korrektur des print-to-print-registers eines mehrfarbendrucks auf druckmaterial |
DE102016213111B4 (de) | 2016-07-19 | 2018-08-09 | Koenig & Bauer Ag | Inspektionssystem mit mehreren Erfassungsbereichen |
EP3539777B1 (de) | 2018-03-14 | 2020-08-12 | Siemens Aktiengesellschaft | Verfahren und vorrichtung zum korrigieren einer druckposition eines druckwerks sowie druckmaschine |
-
2020
- 2020-09-09 DE DE102020123472.4A patent/DE102020123472A1/de active Pending
-
2021
- 2021-06-25 US US17/928,650 patent/US11760082B2/en active Active
- 2021-06-25 WO PCT/EP2021/067489 patent/WO2022053195A1/de unknown
- 2021-06-25 EP EP21736301.9A patent/EP4135983B1/de active Active
Also Published As
Publication number | Publication date |
---|---|
US20230191775A1 (en) | 2023-06-22 |
DE102020123472A1 (de) | 2022-03-10 |
WO2022053195A1 (de) | 2022-03-17 |
EP4135983B1 (de) | 2024-04-10 |
US11760082B2 (en) | 2023-09-19 |
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