EP3988309A1 - Verfahren zum betreiben einer flexodruckmaschine, flexodruckmaschine, system und hülse - Google Patents

Verfahren zum betreiben einer flexodruckmaschine, flexodruckmaschine, system und hülse Download PDF

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Publication number
EP3988309A1
EP3988309A1 EP21200688.6A EP21200688A EP3988309A1 EP 3988309 A1 EP3988309 A1 EP 3988309A1 EP 21200688 A EP21200688 A EP 21200688A EP 3988309 A1 EP3988309 A1 EP 3988309A1
Authority
EP
European Patent Office
Prior art keywords
flexographic printing
sleeve
register
printing
cylinder
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.)
Pending
Application number
EP21200688.6A
Other languages
German (de)
English (en)
French (fr)
Inventor
Werner Schwab
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
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP3988309A1 publication Critical patent/EP3988309A1/de
Pending legal-status Critical Current

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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
    • B41F33/04—Tripping devices or stop-motions
    • B41F33/14—Automatic control of tripping devices by feelers, photoelectric devices, pneumatic devices, or other detectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/10—Forme cylinders
    • B41F13/12—Registering devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/10—Forme cylinders
    • B41F13/12—Registering devices
    • B41F13/14—Registering devices with means for displacing the cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/24—Cylinder-tripping devices; Cylinder-impression adjustments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/06—Devices for attaching printing elements or formes to supports for attaching printing elements to forme cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0009—Central control units
    • 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
    • B41F33/0081—Devices for scanning register marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/16—Programming systems for automatic control of sequence of operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/04—Rotary letterpress machines for printing on webs
    • B41F5/16—Rotary letterpress machines for printing on webs for multicolour printing
    • B41F5/18—Rotary letterpress machines for printing on webs for multicolour printing using one impression cylinder co-operating with several forme cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2200/00—Printing processes
    • B41P2200/10—Relief printing
    • B41P2200/12—Flexographic printing

Definitions

  • the invention relates to a method having the features of the preamble of claim 1 and a method having the features of the preamble of claim 28.
  • the invention further relates to a flexographic printing machine, wherein the flexographic printing machine is operated for printing a printing material with flexographic printing ink according to a method according to the invention, having the features of the preamble of claim 22
  • the invention further relates to a system comprising a flexographic printing machine according to the invention and a measuring device for measuring an image with the features of the preamble of claim 24.
  • the invention further relates to a sleeve for use in a method according to the invention or for use in a flexographic printing machine according to the invention or for use in a system according to the invention with the features of the preamble of claim 26.
  • the invention lies in the technical field of the graphics industry and there in particular in the field of operating a flexographic printing machine, ie a rotary printing machine for printing with flexographic printing forms.
  • the invention lies in the sub-area of setting, in particular controlling or regulating, the machine with regard to the color register and/or the color density and/or the color inspection.
  • the print motifs can have places where a lot is printed and places where little is printed; and places where there is no or only insignificant printing.
  • Flexographic printing forms can be measured before printing, for example in a measuring station.
  • the one not released yet DE102019206705 discloses a device for measuring elevations on the surface of a body of revolution and creates an improvement which, in particular, makes it possible to measure elevations of bodies of revolution, such as flexographic printing dots of a flexographic printing plate, quickly and with high precision.
  • a flexographic printing plate mounted on a sleeve, with a first motor for rotating the rotating body about an axis of rotation and with a Measuring device is characterized in that the measuring device for contactless measurement comprises at least one radiation source and at least one area camera.
  • Scanning rollers do not appear to be suitable for recognizing automated register marks, especially in the case of high-resolution flexographic printing forms with very fine elevations. There is also the risk that such elevations will be damaged by scanning rollers.
  • this object is achieved by a method according to claim 1, a method according to claim 28, a flexographic printing machine according to claim 22, a system according to claim 24 and a sleeve according to claim 26.
  • a method for operating a flexographic printing machine with a printing cylinder carrying a sleeve with at least one flexographic printing forme or a flexographic printing cylinder and an impression cylinder, wherein the print register of the flexographic printing forme or the flexographic printing cylinder is adjusted to a further flexographic printing forme or to a further flexographic printing cylinder and/or the color density adjusted and/or a color inspection is carried out using a sensor, is characterized in that before printing, an image of the surface of the sleeve with the at least one flexographic printing form is captured by a camera and the image is subjected to image processing, with at least one register mark and/or at least one color measuring field being xy-localized; and that before the setting, a sensor for detecting the register mark is automatically moved to the y-position of the register mark and the register mark is detected and/or that before the setting, a sensor for detecting the color measuring field is automatically moved to the y-position of the color measuring field and
  • An (alternatively formulated) method according to the invention for operating a flexographic printing machine, with at least two printing cylinders - each carrying a sleeve with at least one flexographic printing forme each - wherein the pressure register of the flexographic printing forms is adjusted to one another and a sensor for detecting register marks is used is characterized in that before printing, a respective image of the surfaces of the sleeves is captured by a camera and the respective image is subjected to digital image processing, with a total of at least two register marks being x-y-localized, and that before setting the sensor is automatically connected to the y position of the register marks is moved and the register marks are detected and that, using the x-y located register mark position data, the configuration of the register controller for register mark detection is automated.
  • a flexographic printing machine with at least one flexographic printing unit - comprising a printing cylinder carrying a sleeve with at least one flexographic printing forme or a flexographic printing cylinder, an impression cylinder and an anilox roller - the flexographic printing machine for printing a printing material with Flexographic printing ink is operated according to one of the preceding methods, characterized in that the flexographic printing machine comprises at least one servomotor for setting the y-position of the sensor.
  • a system according to the invention comprising a flexographic printing machine according to the invention and a measuring device for capturing an image of a sleeve, is characterized in that the measuring device captures the image of the sleeve using camera technology.
  • a flexographic printing forme or sleeve for a flexographic printing forme according to the invention is characterized in that the machine-readable ID is read by machine and stored on a computer for retrieval.
  • the invention advantageously makes it possible to print cost-effectively and with high quality in industrial flexographic printing.
  • the method according to the invention advantageously also makes it possible to further automate the printing.
  • the invention is described and shown for a flexographic printing machine or for flexographic printing forms (letterpress).
  • the invention can be used for engraved printing forms or engraved sleeves (intaglio printing). Therefore, instead of the term “flexo” alternatively “deep” or “flexo or deep” can be used in this application.
  • sleeve with flexographic printing form “sleeve with engraved form” or “engraved sleeve” or “laser engraved sleeve” or “endless sleeve engraved with laser” or “endless printing form” or “endless printing sleeve” can be used.
  • the Figures 1 to 5 show a flexographic printing machine, a measuring station with a measuring device (various embodiments) and a measuring method.
  • the figure 6 shows the captured image of a sleeve with two flexographic printing forms as an example.
  • figure 1 shows a cross section of a rotatable support cylinder 1 of a measuring station 2, a sleeve 3 (sleeve) held on the support cylinder and a sleeve held on the sleeve, preferably attached to the sleeve by means of an adhesive tape 4 (or alternatively by means of an adhesive coating of the sleeve) (so-called "Mount”), at least with regard to its topography to be measured printing plate 5 (flexographic printing form) as a body of revolution 6.
  • a motor 7 can be present in the measuring station for rotating the carrier cylinder during the measurement.
  • the measuring station can be part of a so-called “mounter” (in which pressure plates are mounted on carrier sleeves) or can be provided separately from a “mounter”.
  • the measuring station can be provided separately from a printing press 8 (flexographic printing press)—with at least one printing unit 9 (flexographic printing unit) for the printing plate 5 and a dryer 10 for printing and drying a preferably web-shaped printing material 11.
  • the printing plate is preferably a flexographic printing form with a diameter of 106 mm to 340 mm.
  • the dryer is preferably a hot air dryer and/or a UV dryer and/or an electron beam dryer and/or an IR dryer.
  • the sleeve can be pushed laterally onto the carrier cylinder.
  • the carrier cylinder can have openings in its outer surface, from which - to widen the sleeve and to generate an air cushion when pushed on - compressed air can be ejected.
  • the sleeve with the printing plate can be removed from the measuring device and pushed onto a printing cylinder of the printing unit in the printing press.
  • a hydraulic clamping system can also be used as an alternative to the pneumatic clamping system.
  • figure 1 12 also shows a digital computer and/or digital memory 39, 39b, 123, 317, 401 and/or 403.
  • the measuring device can generate data and transmit it to the computer/memory.
  • the data can be measured values or data derived from them, which are generated when the sleeve 3 and/or the flexographic printing form(s) 5 are measured.
  • the computer/memory can be part of the measuring device 2 or part of the flexographic printing machine 8; or can be provided separately, e.g. as a central computer/memory (e.g. a print shop) or cloud-based.
  • the computer/memory can transmit data to the flexographic printing machine, for example the measured values or the data derived therefrom or data further derived therefrom.
  • the further derived data can be generated by a computer-implemented algorithm and/or an AI (Artificial Intelligence; software- and/or hardware-based, self- and machine-learning system).
  • AI Artificial Intelligence; software- and/or hardware-based, self- and machine-learning system.
  • the computer/memory can receive data from several measuring stations and transmit data to several flexographic printing machines.
  • the system consisting of flexographic printing machine(s), measuring station(s) and computer/memory allows for a high level of automation during printing, right through to autonomous printing; Error-prone inputs and/or changes to data on the part of the operator can be avoided in this advantageous way.
  • the measuring station 2 can be calibrated with the aid of measuring rings 12 on the carrier cylinder 1 .
  • a measuring sleeve or the carrier cylinder itself can be used for calibration.
  • the following figures show preferred embodiments of devices for the non-contact measurement of elevations 13 on the surface 14 of a rotary body 6 designed as a flexographic printing form of the printing press 8 (cf. Figure 2C ).
  • the elevations can be flexographic printing dots (in the grid) or flexographic printing areas (in the full area) of a flexographic printing plate.
  • the measurement of a printing plate 5 is described as an example. By measuring the printing plate, an automatic presetting of the respective optimum working pressure between the cylinders involved in the printing process, eg screen cylinder 15, impression cylinder 16 with printing plate 5 and impression cylinder 17, is made possible.
  • the Figures 2A to 2C show a preferred embodiment of the device for measuring the topography of a printing plate 5; Figure 2A in cross section, Figure 2B in top view and Figure 2C an enlarged section Figure 2A .
  • the topography is preferably recorded with a plurality of devices 18 as part of a 3D radius determination with an optional reference line.
  • 2D means that a section of the printing plate 5 (e.g. annular height profile) is scanned and "3D” means that the entire printing plate 5 (e.g. cylindrical height profile composed of annular height profiles) is scanned.
  • the device comprises a plurality of radiation sources 19, in particular light sources 19, preferably LED light sources, at least one reflector 20, e.g. a mirror, and at least one light receiver 21, preferably an area camera and particularly preferably a high-speed camera.
  • light sources are assumed to be the radiation sources, i.e. visible light is emitted.
  • the radiation source can emit other electromagnetic radiation, e.g., infrared.
  • the light sources are preferably arranged in a row perpendicular to the axis of rotation 22 of the carrier cylinder 1 and produce a light curtain 23, with the carrier cylinder 1 with sleeve 3 and printing plate 5, i.e. the contour, generating a shadow 24.
  • the reflected and then received light 25, ie essentially the emitted light 23 without the light 24 shaded by the topography 13, carries information about the topography 13 to be measured.
  • the reflector 20 can be designed as a reflective foil.
  • the light source 19 is planar (area camera).
  • the light source preferably emits visible light.
  • the light sources 19 and light receivers 21 preferably cover the working width 26, ie the extension of the printing plate 5 in the direction of its axis 22 (eg 1650 mm).
  • n light sources 19 and light receivers 21 can be provided, for example 2>n>69. A higher cap than 69 may be required when using smaller sized cameras. If the entire working width 26 is covered, the printing plate 5 can be measured during one revolution of the carrier cylinder 1.
  • the light sources and light receivers must be moved or clocked in the axial direction 27 along the printing plate.
  • Inexpensive but fast-working cameras 21 are preferably used, e.g. black-and-white cameras.
  • the cameras can record 5 individual images or a film as the printing plate rotates.
  • the device consisting of light sources 19, reflector 20 and light receiver 21 can preferably be moved in a direction 28 perpendicular to the axis 22 of the carrier cylinder 1 in order to direct the light strip 23 generated onto the topography 13 to be measured.
  • a motor 29 can be present for this purpose. Provision can also be made for the reflector to be stationary and for only the light source and/or the light receiver to be moved, e.g. by a motor.
  • the topography 13 is preferably measured in a vertical direction (e.g. camera “below” and reflector “above”) and not in a horizontal direction, since in this case a possible deflection of the carrier cylinder 1 and the reference object 30 can be ignored.
  • a vertical direction e.g. camera "below” and reflector "above”
  • a horizontal direction since in this case a possible deflection of the carrier cylinder 1 and the reference object 30 can be ignored.
  • the line-like object preferably extends parallel to the axis of the carrier cylinder 1 and is arranged at a small distance 32, for example 2 mm to 10 mm (maximum up to 20 mm), from its lateral surface 33 or the printing plate 5 arranged thereon.
  • the received light 25 also contains information about the reference object 30 that can be evaluated, e.g.
  • the reference line can be used to calculate the radial distance R of the topography 13 or the contour or the contour elevations of the reference object 30, preferably using digital image processing will.
  • the distance of the reference object 30 from the axis 22 of the carrier cylinder 1 is known from the arrangement and/or motorized adjustment of the reference object 30 (optionally together with light source 19 and light receiver 21 and possibly reflector 20).
  • the radial spacing of the contour elevations, ie the radius R of the pressure points, can thus be determined by computation.
  • the reference object 30 Due to the use of the reference object 30 and thus the presence of shadowing caused by it or a reference line 31 corresponding to the shadowing (in the recorded image or from the received light) of each camera 21, an exact, e.g. pixel-precise, alignment of the cameras to one another is not mandatory necessary. Furthermore, the reference object 30 can be used to calibrate the measuring system.
  • the reference object 30 can be coupled to the light source 19 and/or the motor 29 for movement or adjustment in the direction 28 .
  • the reference object can have its own motor 29b for moving/adjusting.
  • a measurement is preferably carried out with the ("empty") carrier cylinder or a measuring sleeve arranged thereon (measurement of the distance between the reference object and the surface from AS to BS).
  • the area camera 21 is preferably first moved in the direction 28 toward the carrier cylinder 1 .
  • the movement is preferably stopped as soon as the camera detects the first elevation.
  • the reference object 30 is preferably also moved in direction 28 up to a predetermined distance, e.g. 2 mm, from the carrier cylinder 1.
  • light source 19 and light receiver 21 can also be arranged on opposite sides of support cylinder 1; in this case the reflector 20 can be dispensed with.
  • the light source 19, the reflector 20 (if present according to the embodiment), the light receiver 21 and the optional reference object 30 preferably form a (vertical to the axis 22 of the support cylinder) movable. in particular a motorized adjustable or movable unit 34.
  • the carrier cylinder 1 rotates with the printing plate 5 located thereon, so that preferably all elevations 13 in the circumferential direction 35 can be detected.
  • a topographical image and the radius R of individual elevations 13, e.g. flexographic printing dots, relative to the axis 22 or the diameter D (measured between opposite elevations) can be determined from this.
  • topography 13 of the printing plate 5 is shown and the shading 24 of the topography and the shading 36 of the reference object 30 can be seen.
  • the topography elevations 13 can be in the range from 2 ⁇ m to 20 mm.
  • a sensor 37 can also be provided, which detects the sleeve 3 and/or the pressure plate 5 using an identification feature 38 (cf. Figure 2B ) detected.
  • This feature can be a barcode, a 2D code (eg QR code or data matrix code), an RFID chip or an NFC chip, for example.
  • the signals and/or data generated by the light receivers 21, which include information about the topography 13 of the measured surface 14 and about the reference object 30, are transmitted to a computer 39, preferably via a cable or radio link, and processed there.
  • the computer is connected to the printing machine 8 .
  • the computer 39 evaluates the information.
  • the reference object 30 Before the measurement, the reference object 30 can be brought into the detection range of the light receiver 21 in order to calibrate the light receiver.
  • the light receiver 21 detects and transmits the calibration signals generated to the computer 39 .
  • the calibration data are recorded in the digital memory 40 of the computer 39 .
  • the reference object 30 is then removed from the detection range of the light receiver 21 and the topography 39 of the surface 14 to be measured is further processed together with the virtual reference object.
  • the result of the evaluation is stored in a digital memory 40 of the computer, in a memory 40 of the printing press or in a cloud-based memory.
  • the results are preferably stored in association with the respective identification feature 38 .
  • the identification feature 38 of the printing plate 5 or of the flexographic printing form (or the sleeve) can be read in again.
  • the values stored for the identification feature 38 can then be called up, e.g. for the purpose of presetting. For example, it can be provided that the printing machine receives the data required for a print job from the cloud-based storage.
  • the result of the evaluation can preferably include up to four values:
  • a device 43 for detecting the point density can be provided, preferably a CIS scanner bar (contact image sensor), a line camera, or a laser triangulation device.
  • the device 43 can be a pivotable or movable mirror such that it can be used together with the light sources 19, 21 for measuring the point density.
  • the device is preferably connected to a device for image processing and/or image evaluation, which the computer 39 - or the computer 39 with corresponding programming - is or which can be another computer 39b.
  • a CIS scanner bar can be arranged axially parallel to the cylinder. It preferably includes LEDs for lighting and sensors for image recording (similar to a scanner bar in a commercial copier).
  • the bar is preferably arranged at a distance of 1 to 2 cm from the surface or is positioned at this distance.
  • the cylinder with the surface to be measured e.g. the printing plate, rotates under the bar, which creates an image of the surface and provides an image evaluation for a point density evaluation.
  • the data obtained from recording the dot density can also be used, for example, to select or recommend an anilox roller from a set of available anilox rollers that is optimal for printing with the recorded printing form.
  • the Figures 3A and 3B show a preferred embodiment of the device for measuring the topography of a printing plate 5; Figure 3A in cross section and Figure 3B in top view.
  • the topography is preferably recorded with a laser micrometer 44 as part of a 2D diameter determination.
  • the device comprises a light source 19, preferably a linear LED light source 19 or a linear laser 19, and a light receiver 21, preferably a line camera 21.
  • the laser and light receiver together form a laser micrometer 44.
  • the light source 19 produces a light curtain 23 and the carrier cylinder 1 with sleeve 3 and pressure plate 5 creates a shading 24.
  • the line lengths of the light source 19 and the light receiver 21 are preferably greater than the diameter D of the carrier cylinder including the sleeve and pressure plate in order to view the topography without moving the device 44 perpendicular to the axis 22 of the to allow carrier cylinder. In other words: the cross-section of the carrier cylinder is completely in the light curtain.
  • the device 44 consisting of the light source 19 and the light receiver 21 can be moved parallel to the axis 22 of the carrier cylinder (in the direction 27) in order to cover the entire working width 26.
  • a motor 45 can be present for this purpose.
  • a sensor 37 can be provided, which detects the sleeve 3 and/or the pressure plate 5 using an identification feature 38 (cf. Figure 2B ).
  • the signals and/or data generated by the light receivers 21 are transmitted to a computer 39, preferably via a cable or a radio link, and processed further there.
  • the computer is connected to the printing machine 8 .
  • light source 19 and light receiver 21 can also be arranged on the same side of support cylinder 1; in this case, a reflector 20 is opposite, similar to that in FIGS Figures 2A to 2C arranged.
  • the topography is preferably recorded with a laser micrometer 44 as part of a 2D diameter determination, in which not only a single measurement line 46, but a wider (dashed) measuring strip 47 from several (dashed) measuring lines 48 are recorded.
  • the light source 19 and light receiver 21 are preferably flat and not just in the form of lines.
  • the light source 19 can comprise a plurality of lines of light 48 each having a width of approximately 0.1 mm and a distance of approximately 5 mm from one another.
  • the camera is preferably designed as an area camera.
  • the Figures 4A and 4B show a preferred embodiment of the device for measuring the topography of a printing plate 5; Figure 4A in cross section and Figure 4B in top view.
  • the topography is preferably recorded with a laser micrometer as part of a 2D radius determination.
  • the device comprises a light source 19, preferably an LED light source 19, and a light receiver 21, preferably a linear LED light source 21 or a linear laser 21.
  • the light source 19 generates a light curtain 23 and the carrier cylinder 1 with sleeve 3 and printing plate 5 generates a shadow 24.
  • the device consisting of the light source 19 and the light receiver 21 can preferably be moved in a direction 28 perpendicular to the axis 22 of the carrier cylinder 1 in order to direct the light curtain 23 onto the topography 13 to be measured.
  • a motor 29 can be present for this purpose. If the light curtain 23 is wide enough and therefore covers the measuring range, the motor 29 can be dispensed with.
  • the signals and/or data generated by the light receivers 21 are transmitted to a computer 39, preferably via a cable or a radio link, and processed further there.
  • the computer is connected to the printing machine 8 .
  • light source 19 and light receiver 21 can also be arranged on the same side of the carrier cylinder; in this case, a reflector 20 is opposite, similar to that in FIGS Figures 2A to 2C arranged.
  • the topography 13 is preferably recorded with a laser micrometer 44 as part of a 3D radius determination, with not just one measuring line 46 but a wider measuring strip 47 (shown in dashed lines), i.e. several measuring lines 48 being recorded at the same time.
  • the light source 19 and light receiver 21 are flat and not just in the form of lines.
  • the topography 13 is preferably recorded with a laser micrometer 44 as part of a 3D radius determination, with the device consisting of light source 19 and light receiver 21 preferably being able to be moved in a direction 28 perpendicular to the axis of the carrier cylinder 1 in order to Aiming the light curtain 23 at the topography 13 to be measured.
  • a motor 29 (shown in dashed lines) can be present for this purpose.
  • the topography 13 is preferably recorded with a laser micrometer 44 as part of a 3D radius determination, with the two latter alternative embodiments being combined.
  • figure 5 shows an exemplary and greatly enlarged topography measurement result of a printing plate 5 (flexographic printing form) with two printing areas 50 and two non-printing areas 51.
  • the radial measurement results for 360° at an axial location (relative to the axis of the carrier cylinder) are shown.
  • the non-printing areas can have been produced by etching, for example, and can therefore have a smaller radius than the printing areas.
  • the illustration also shows an enveloping radius 52 or an envelope 52 of those points of the pressure plate 5 with the largest radius, i.e. the highest elevations of the topography 13 at the axial location.
  • the point 53 of the printing plate 5 is a printing point, since this would have sufficient contact with the printing material and the ink-transferring anilox roller in printing operation with a normally set pressure or print infeed between the printing plate 5 and the printing material 11 or transport cylinder 17.
  • Normally set pressure produces a so-called kiss print, in which the printing plate just touches the substrate and in which the flexo printing dots are not significantly squeezed.
  • the point 54 is a point which would just about print in the printing operation with the pressure set normally, since it would just about still be in contact with the printing material.
  • the two points 55 are points that would not print, since they would not have any contact with the printing material or with the anilox roller during printing with a normally set pressure.
  • a computer program runs on the computer 39 and calculates the radially lowest point 56 and its radial distance 57 from the envelope 52 in the printing area 50 , for example using digital image processing. This calculation is carried out at regular intervals in the axial direction, eg from AS to BS at all measuring points, and the respective maximum of the lowest points (ie the maximum lowest value) from AS to middle and from middle to BS is determined.
  • the two maxima or from it Computationally determined infeed values or setting values can be selected, for example, as the respective infeed/setting on AS and BS during printing, ie the cylinder spacing between the cylinders involved in printing is reduced by the infeed on AS and BS.
  • a motor-driven threaded spindle can be used on the AS and on the BS for this purpose.
  • the manufacturing-related and/or operational (due to wear and tear) concentricity of the sleeve 3 can also be measured and can be taken into account on the basis of the measurement and evaluation results during printing to improve the quality of the printed products produced.
  • a warning can be issued if a specified concentricity tolerance is exceeded.
  • the measurement can be carried out on smooth and porous sleeves.
  • radar emitters 19 can also be used within the scope of the invention.
  • parameters for a dynamic print infeed can also be determined and transferred to the printing press.
  • a known (eg previously measured) and available to the computer 39 delayed expansion of the deformable and/or compressible pressure points 53 to 55 made of polymer material can be taken into account.
  • a pre-determined durometer hardness of the printing plate can be used. This expansion can depend in particular on the operationally prevailing printing speed or this printing speed dependency can are taken into account. For example, at higher printing speeds, a higher pressure setting can be selected.
  • the printing surface of the printing plate 5 or the dot density i.e. the locally variable density of the printing dots on the printing plate 5, (as an alternative or in addition to the printing speed) can also be taken into account: For example, with higher dot densities, a higher pressure setting can be selected and/or the dot density can be increased be used when setting the dynamic pressure adjustment.
  • the received light 25, ie essentially the emitted light 23 without the light 24 shadowed by the topography 13, can be used. It carries information about the topography 13 to be measured and/or its surface point density and/or its elevations.
  • a device 43 for detecting or measuring the point density, i.e. its local values, on the printing form, e.g. flexographic printing form can also be provided, preferably a CIS scanner bar or a line camera. It can be provided, for example, based on the data obtained/calculated from the dot density determination, default values for a different pressure adjustment on AS (drive side of the printing machine) and BS (operating side of the printing machine).
  • the ink consumption to be expected when printing with the printing plate on a given printing material 11 can be determined by calculation.
  • the required drying power of the dryer 10 for drying the ink on the printing material can be determined by calculation from the ink consumption. Based on the calculated, anticipated ink consumption, an ink supply to be provided can also be calculated.
  • a so-called channel beating pattern can also be taken into account in all of the illustrated embodiments and the alternatives mentioned.
  • a channel runout pattern is a disturbance that occurs periodically during the operational rotation of the printing plate 5 caused by a page width or at least disturbingly wide gap or channel in the printed image, ie a disturbingly large area without printing dots, or another axial channel, which usually extends in the axial direction.
  • the print quality can be impaired by such channels or their channel beating pattern, since the cylinders involved in printing approach and repel rhythmically due to the kiss print position in the area of the channel that recurs during rotation. In the worst case, this can lead to unwanted density fluctuations or even print failures.
  • An existing sewer runout pattern can preferably be recorded using a CIS measuring device 43 (eg the above-mentioned swiveling or movable mirror together with the area cameras) or using an area camera and evaluated by computer and compensated for the pressure infeed required for operation.
  • a CIS measuring device 43 eg the above-mentioned swiveling or movable mirror together with the area cameras
  • an area camera evaluated by computer and compensated for the pressure infeed required for operation.
  • it can be predicted at which speeds or rotational frequencies of a printing press vibrations would occur. These speeds or rotational frequencies are then not used during production and are overrun, for example, when the machine is started up.
  • Each printing plate 5 can have an individual channel beating pattern. Channels in the printing form can have a negative impact on the print result or even lead to print failures. In order to mitigate or even eliminate channel beats, the pressure plate is checked for channels in the rolling direction. If the resonant frequencies of the printing unit 9 are known, production speeds can be calculated which are particularly unfavorable for a given printing form. These printing speeds should be avoided (so-called "no go speed").
  • register marks (or several register marks, e.g. wedges, double wedges, dots or crosshairs) can also be detected on the printing form, e.g. using the camera 21 or 43 and downstream digital image processing, and their position measured. be stored and made available. This enables automatic adjustment of register controllers or their register sensors to the register marks or to axial positions allowed. Errors caused by the otherwise customary manual setting of the sensors can thus be advantageously prevented.
  • patterns can be captured and used to configure a register controller.
  • a camera 400, 21, 43
  • an image of a flexographic printing forme (410) is used to digital image processing, e.g. using a computer (410), with at least one register mark (310, 311 ) is x-y localized.
  • This localized x-y data of the register mark can be stored for an ID or an identifier 316 of the sleeve in a digital memory 317 and made available to the flexographic printing machine or the flexographic printing unit when the sleeve is used, stating the ID.
  • the flexographic printing machine or the flexographic printing unit uses the register mark position data (x-y localization) to set the register rule control.
  • the setting of the register control also means, for example, the configuration of the register marks of a print job.
  • a print job there are usually several printing units with inks or varnishes in the printing operation, in which one flexographic printing form (410) is used for each printing unit.
  • the position data (x-y localization) of the print marks (310, 311) for e.g. two flexographic printing forms can be different.
  • the register control of the printing machine receives the position data (x-y - localization) of the print mark (310, 311) for each flexographic printing form (410) used with the identifier (316), whereby the configuration of the register marks of the print job can be composed of several flexographic printing forms (410). .
  • An advantageous method for configuring the register controller is that before printing an image (410) of the surface of the sleeve with the at least one flexographic printing form is captured by a camera (400) and the image is subjected to image processing, wherein at least one registration mark (310) is or are xy-located; and that it automates the adjustment of a register controller for register mark detection.
  • the output of the dryer 10 of the printing press 8 can also be controlled or regulated.
  • LED dryer segments can be switched off in areas where no printing ink has been transferred to the substrate, which means that advantageous energy savings and an increase in the lifespan of the LEDs are possible.
  • the output of the dryer 10 or the output of individual segments of the dryer for printing areas on the printing plate with a low dot density can also be advantageously reduced. This can save energy and/or extend the service life of the dryer or individual segments.
  • Switching off or reducing can take place on the one hand in areas and on the other hand in a direction parallel and/or transverse to the axial direction of a printing plate or to the lateral direction of the printing material to be processed with it.
  • segments or modules of a dryer can be switched off in areas corresponding to gaps between printing plates (eg spaced apart, in particular glued on by hand).
  • the respective location (on the printing plate 5) of measurement fields for print inspection systems can also be recorded and made available for further use, e.g. for setting the location of the print inspection systems.
  • An inline color measuring system can also be positioned in all of the illustrated embodiments and the alternatives mentioned. In order to determine the location and thus the position of the inline color measurement, image and/or pattern recognition is carried out, on the basis of which the axial position for the measurement system is determined. The inline color measurement system can be informed of free print points to allow for a free point for the calibration on the printing material.
  • figure 6 shows a captured image 410 of a sleeve 300 and, by way of example, two flexographic printing forms 301 and 302.
  • the image is preferably captured or generated by a camera 400, in particular in a measuring station 2.
  • the image can be transmitted to a computer 401.
  • the computer 39 can do this Figure 2a be.
  • the image can be subjected to computational image processing. Information or data can be obtained in the process. This data can be stored for an ID or an identifier 316 of the sleeve in a digital memory 317 and made available to the flexographic printing machine when the sleeve is used, stating the ID.
  • a detected area 303 with a high point density and a detected area 304 with a low point density are shown as an example.
  • the areas can be image-processed recognized and separated and preferably color coded. Knowing the local dot densities of the entire flexographic printing forme 301 (and the additional flexographic printing forme 302) can be used to calculate a preset value for the so-called pressure adjustment, i.e. for setting the contact pressure between the flexographic printing cylinder and the impression cylinder (and/or anilox roller) when using the sleeve.
  • a captured channel 305 is also shown as an example. There are no (or essentially no) printing elevations of the flexographic printing forme 301 in the area of the channel 305.
  • the channel 305 extends primarily in the axial y-direction and due to its y-length (and x- Width) critical with regard to possible channel impacts when passing through the printing gap and thus with regard to possible disturbing vibrations when operating the flexographic printing machine.
  • the gaps 306 and 307 which are also shown as examples, are not critical in this regard due to their dimensions and/or adjacent/adjacent printing locations 307a. The same applies to the gap 308 between the two flexographic printing forms 301 and 302 which are mounted at a distance from one another (e.g. glued to the sleeve 300).
  • the gap 309 between the front and rear edges of the flexographic printing form 301 can be critical. Critical gaps are identified by computation and preferably identified as channels.
  • a register mark 310 and a register mark 311 are also shown by way of example.
  • the marks and fields are arranged in respective control strips 314 and 315.
  • the marks and fields are preferably also captured by the camera 400 and recognized and separated by image processing. Your determined position data (x-y localization) are saved to the sleeve ID 316.
  • a so-called error mark 318 for detecting an assembly error of a flexographic printing form or several flexographic printing forms on the sleeve or on several sleeves is also shown as an example. Their position data is also saved for the sleeve ID 316.
  • FIG 6 Figure 12 also shows a sensor 402.
  • the sensor 402 may be a register sensor and/or a spectrometer. This is arranged in the flexographic printing unit of the flexographic printing machine and directed to the printing material web 11.
  • the sensor is connected to a computer 403 and can be moved by a motor (by means of the motor 404) in the axial y-direction 405 and can therefore be positioned automatically.
  • the sensor can move along the printing material 11 to the y-position of a mark 310, 311 to be printed and to be detected and/or the same or another Sensor in the field 312, 313 z. B. for color inspection with a spectrometer along the printing material 11 are positioned.
  • the sensor transmits the data generated by the sensor to the computer 403 , which can be identical to the computer 401 and/or to the computer 39 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Quality & Reliability (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP21200688.6A 2020-10-22 2021-10-04 Verfahren zum betreiben einer flexodruckmaschine, flexodruckmaschine, system und hülse Pending EP3988309A1 (de)

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DE102020213327 2020-10-22

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US (1) US11865830B2 (zh)
EP (1) EP3988309A1 (zh)
CN (1) CN114379223B (zh)
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DE3302798A1 (de) 1983-01-28 1984-08-02 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Vorrichtung zum voreinstellen an druckmaschinen
US20050194087A1 (en) * 2004-01-27 2005-09-08 Erminio Rossini S.P.A. Printing member provided with identification means defined by or connectable to updateable means for recording data relative to the member and useful for its utilization
WO2008049510A1 (de) 2006-10-23 2008-05-02 Hell Gravure Systems Gmbh & Co. Kg Verfahren und vorrichtung zur überprüfung der qualität wenigstens eines druckformzylinders und eine mit einer solchen vorrichtung ausgerüstete fertigungslinie
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EP3251850A1 (de) 2016-06-01 2017-12-06 Windmöller & Hölscher KG Flexodruckmaschine mit mounter

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US20220126562A1 (en) 2022-04-28
DE102021125643A1 (de) 2022-04-28
CN114379223A (zh) 2022-04-22
CN114379223B (zh) 2023-12-26
US11865830B2 (en) 2024-01-09

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