EP4574430A1 - Procédé de détermination de la profondeur de structure, dépendante de la position, d'un cliché flexographique ou d'une surface tramée - Google Patents

Procédé de détermination de la profondeur de structure, dépendante de la position, d'un cliché flexographique ou d'une surface tramée Download PDF

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Publication number
EP4574430A1
EP4574430A1 EP24213771.9A EP24213771A EP4574430A1 EP 4574430 A1 EP4574430 A1 EP 4574430A1 EP 24213771 A EP24213771 A EP 24213771A EP 4574430 A1 EP4574430 A1 EP 4574430A1
Authority
EP
European Patent Office
Prior art keywords
flexographic printing
camera
depth
location
printing form
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
EP24213771.9A
Other languages
German (de)
English (en)
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 EP4574430A1 publication Critical patent/EP4574430A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/18—Curved printing formes or printing cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
    • B41C1/045—Mechanical engraving heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
    • B41C1/05—Heat-generating engraving heads, e.g. laser beam, electron beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/26—Construction of inking rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/02—Arrangements of indicating devices, e.g. counters
    • 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
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/02—Letterpress printing, e.g. book printing
    • B41M1/04—Flexographic printing
    • 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
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/04—Printing plates or foils; Materials therefor metallic
    • B41N1/06—Printing plates or foils; Materials therefor metallic for relief printing or intaglio printing
    • 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

Definitions

  • the invention relates to a method for determining the location-dependent structural depth of a flexographic printing plate or screen surface with the features of the preamble of claim 1.
  • the invention lies in the technical field of the graphic arts industry, and in particular in the area of flexographic printing, i.e., the operation of a flexographic printing press, i.e., a rotary printing press for printing with flexographic printing plates; and the operation of its peripheral devices, in particular a so-called mounter, in which several flexographic printing plates are arranged on a cylinder or cylinder sleeve depending on the print job.
  • the invention lies in the subfield of the precise measurement of "mounted" flexographic printing plates, e.g., directly in the mounter, or of screen areas.
  • the EP3465169B1 discloses a method for determining the position of an (embossed) structure on a surface. This involves using an image acquisition system that illuminates a line on the surface from different angles, captures the reflected light using a camera, and evaluates it using a computer.
  • the MX2010000925A discloses an instrument for the automatic and non-contact measurement of the relief and line depth of a flexographic printing plate under industrial conditions. It uses an interferometric sensor system.
  • the GB2170314A discloses a method for contactless measurement of the depth or relief of a surface, e.g., a flexographic printing plate.
  • the focus of a focus unit used in conjunction with a sensor unit is changed.
  • the EP3822080B1 discloses a method for examining and assessing flexographic printing plates for irregularities in the relief. This involves using a 3D camera that captures images based on triangulation methods, a time-of-flight measurement, or an interferometric method.
  • the WO2008049500A2 discloses sensing rollers for measuring a printing form.
  • the DE102020111341A1 discloses a device for measuring elevations on the surface of a rotating body according to the preamble of claim 1.
  • the measuring process described therein uses a reference object, for example a taut wire, ie the measurement of the elevations takes place relative to the reference object.
  • Flexographic printing plates used in flexographic printing are typically either etched (usually treated locally with a solvent that locally attacks or dissolves the material of the flexographic printing plate) to create the desired print image, or directly imaged (engraved) by laser.
  • the resulting etching or engraving depth is critical for the printing process and the achievable print quality. Therefore, manufacturers of flexographic printing products desire to obtain information about the actual etching or engraving depth of a flexographic printing plate and to be able to use this information to improve print quality.
  • printing-relevant information about screen surfaces e.g., the surfaces of anilox rollers or anilox sleeves.
  • a method for determining the location-dependent structure depth of a flexographic printing form or screen surface comprising the steps of: providing and using at least one light source which irradiates at least a portion of a structured surface of the flexographic printing form or screen surface with light, and providing and using at least one camera which generates an image of the structure at least in the portion, is characterized in that the camera is provided as a 1D camera or as a 2D camera, that the light in the portion strikes the structure in a direction substantially parallel to the surface of the flexographic printing form or screen surface, that the structure generates a location-dependent shadowing in the path of the light, that the light source and the camera are arranged relative to one another in such a way that the camera detects the location-dependent shadowing, and
  • the invention advantageously makes it possible to determine the structural depth of a flexographic printing plate or screen surface, preferably over the entire usable length and width of the Flexographic printing form or screen surface, and to provide the result to improve print quality.
  • the invention is preferably used in the production of printed products in flexographic printing machines.
  • the measurement according to the invention preferably does not require a reference object other than the printing form or screen surface.
  • the (radial) structure depth is preferably determined relative to a base of the structure and can be determined, for example, from the width of a (radial) shadow caused by the structure or its elevations.
  • the (radial) position of the base of the structure can also be determined, preferably in advance and in an area of the printing form without elevations.
  • the term "radial" means: extending in the radial direction or lying at a specific radial position; with reference to a center point of the flexographic printing form (located on a sleeve with a circular cross-section).
  • a flexographic printing plate By knowing the structural depth of a flexographic printing plate, in particular its etching depth or engraving depth, the operating personnel can draw conclusions about the etching process (dissolving with solvent, subsequent washing out and, if necessary, brushing/using a specific type of brush). For example, information can be gained about how firmly the individual elevations (printing dots) are anchored to the base of the printing plate (so-called base thickness). If a measured flexographic printing plate shows critical areas that are, for example, below or above a predetermined threshold for the etching depth, corrections can be made to the etching process for subsequent printing plates. Information can also be gained about the aging state of the exposure unit used and/or its intensity.
  • etching depth that is essentially constant across the width and length of the printing plate is preferred. Typical etching depths are in the range of 500 ⁇ m, for example. For example, information can also be gained about how long the printing plate can be used without significant loss of print quality. The information from the measurement process can also be used to make appropriate adjustments to the flexographic printing form. For example, the optimal contact pressure can be set for a flexographic printing form with a given and measured etching depth. This measure can significantly improve print quality. The same applies to printing forms that are not etched. were not imaged, for example, by treatment with laser light, but rather by laser engraving. In this case, the exposure intensity or exposure time can be adjusted.
  • the invention also offers the further advantage that the measurement of the printing form and the resulting information about the structure depth can be used for further automation of the printing process. This can potentially reduce the number of operating personnel or replace unavailable operating personnel.
  • a further development can be characterized by the computer additionally calculating, i.e., determining, the thickness of the flexographic printing form or screen area from the measured values. This thickness is preferably determined at the edge of the flexographic printing form or screen area.
  • a further development can be characterized by the computer additionally calculating clearances in the flexographic printing form or screen area. Such clearances can be defined as areas of the printing form in which there are no printing elevations.
  • a further development can be characterized by the fact that the flexographic printing form or screen surface is rotated and that the rotation is detected by an encoder.
  • the location-dependent structure depth can be provided with angle information (in the circumferential direction of the flexographic printing form and/or the sleeve or screen surface). This angle information can later be used in the flexographic printing press.
  • the Figure 1 shows a schematic representation of a sectional view of a measuring device when carrying out a preferred embodiment of the invention and the further developments.
  • FIG. 1 The sequence of the method according to the invention can be seen. Shown is a measuring device 1 in operation, e.g., a so-called mounter, with a rotatable cylinder 2.
  • the cylinder 2 can rotate about a rotation axis 3.
  • the rotation is driven by a motor 4.
  • the motor 4 can be equipped with an encoder 5, in particular a rotary encoder 5; alternatively, a separate encoder can be present.
  • a sleeve 6 is mounted on the cylinder 2.
  • a flexographic printing form 10 is received or mounted, preferably glued, on the sleeve 6.
  • This form has a surface 11 with a (printing) structure 11a made up of elevations.
  • a section 12 of the surface 11 is optically detected or measured.
  • In section 12 there is at least one printing elevation 13 (e.g. a flexographic printing area or a flexographic printing dot).
  • In section 12 there is an area with non-printing depressions 14 or clearances 14.
  • the printing elevations 13 define an enveloping circle 15.
  • the depressions 14 have a base 16. The distance between this base 16 and the enveloping circle 15 defines a depth of the structure 17 or the structure depth.
  • the depth of the structure 11a can be determined, for example, by the manufacturer's process of etching/dissolving or laser processing.
  • Figure 1 also shows at least one light source 20, which emits light 21 with a width 22.
  • the light 21 is received by a camera 30, which is preferably arranged opposite the light source 20.
  • a reflector in particular a mirror 23, can be provided, which reflects the light 21, which is then received by a camera 31 at an alternative position.
  • the camera 31 can be arranged next to the light source 20, as shown.
  • the light source 20 and camera 31 can also form a common assembly; for example, the light source 20 can be installed in the housing of the camera 31. It can be seen that the printing elevation 13 creates a shadow 24 in the light 21, and that this shadow 24 is also detected by the camera.
  • the shadow 24 has a width 25.
  • the width 25 of the shadow can correspond to the depth 17 of the structure 11a.
  • an image 32 can be recorded by camera 30 or 31, from which the shadow 24 or its width 25 and, from this, the depth 17 of the structure 11a can be determined mathematically. In the simplest case, the depth 17 corresponds exactly to the width 25 of the shadow 24.
  • a computer 40 is available via connections 41 for the necessary calculations.
  • the light source 20 and the camera 30 or 31 and, if applicable, the reflector or mirror 23 can be moved individually or, preferably, together by a motor. In this way, it is possible to react to different outer diameters of the sleeve 6 and/or the flexographic printing form 10. The movement preferably takes place perpendicular to a tangential plane to the surface to be measured.
  • the light source 20 and the camera 30 or 31 and, if applicable, the mirror 23 can be arranged as a group, alternatively rotated by 90° or 180°, and carry out the measurement accordingly.
  • a grid sleeve 6 with a grid surface 10 can be mounted on the cylinder 2 and measured accordingly.
  • the camera 30 or 31 preferably records a sufficiently wide area 21 such that not only the structure depth 17 of the structure 11a (of the flexographic printing form 10 or the screen area 10) can be detected in the described way, but alternatively or additionally the thickness of the flexographic printing form 10 or the screen area 10 via its shading 25a.
  • the thickness can preferably be measured at the (lateral) edge of the flexographic printing form 10 or the screen area 10. With knowledge of the determined The thickness of the flexographic printing plate 10 can be used, for example, to check whether it is a flexographic printing plate 10 that has already been used (once or several times), since the thickness decreases with use.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP24213771.9A 2023-12-21 2024-11-19 Procédé de détermination de la profondeur de structure, dépendante de la position, d'un cliché flexographique ou d'une surface tramée Pending EP4574430A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102023136188.0A DE102023136188A1 (de) 2023-12-21 2023-12-21 Verfahren zum Ermitteln der ortsabhängigen Strukturtiefe einer Flexodruckform

Publications (1)

Publication Number Publication Date
EP4574430A1 true EP4574430A1 (fr) 2025-06-25

Family

ID=93590625

Family Applications (1)

Application Number Title Priority Date Filing Date
EP24213771.9A Pending EP4574430A1 (fr) 2023-12-21 2024-11-19 Procédé de détermination de la profondeur de structure, dépendante de la position, d'un cliché flexographique ou d'une surface tramée

Country Status (4)

Country Link
US (1) US20250206011A1 (fr)
EP (1) EP4574430A1 (fr)
CN (1) CN120191118A (fr)
DE (1) DE102023136188A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2170314A (en) 1984-10-22 1986-07-30 Zed Instr Ltd Measurement of depth or relief
WO2008049500A2 (fr) 2006-10-23 2008-05-02 Fischer & Krecke Gmbh Presse rotative et procédé pour ajuster un de ses cylindres
US20110076613A1 (en) * 2009-09-30 2011-03-31 Fujifilm Corporation Resin composition for laser engraving, relief printing plate precursor for laser engraving and method for producing the same, and relief printing plate and method for making the same
MX2010000925A (es) 2010-01-22 2011-07-21 Redi Color S A De C V Instrumento de medición de espesor, relieve, profundidad de punto y registros en placas para impresión.
US20130075376A1 (en) * 2011-09-26 2013-03-28 Norimasa Shigeta Relief printing plate manufacturing method, relief printing plate creating apparatus, and recording medium
DE102020111341A1 (de) 2019-05-09 2020-11-12 Heidelberger Druckmaschinen Aktiengesellschaft Vorrichtung zum Vermessen von Erhebungen der Oberfläche eines Rotationskörpers
EP3465169B1 (fr) 2016-05-30 2021-09-29 Bobst Mex Sa Système de capture d'image et procédé permettant de déterminer la position d'une structure en relief sur un élément en feuille
EP3822080B1 (fr) 2019-11-18 2023-04-26 Bobst Bielefeld GmbH Procédé de détermination des paramètres d'impression d'une machine d'impression et banc d'essai

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE510988C2 (sv) * 1997-08-22 1999-07-19 Valmet Karlstad Ab Sätt och mätanordning att beröringsfritt mäta rakhet vid en mantelyta
DE102006050274A1 (de) * 2006-10-23 2008-05-29 Hell Gravure Systems Gmbh & Co. Kg Verfahren und Vorrichtung zur Überprüfung der Qualität wenigstens eines Druckformzylinders und eine mit einer solchen Vorrichtung ausgerüstete Fertigungslinie
JP7421636B2 (ja) * 2020-04-02 2024-01-24 旭化成株式会社 製版システム及び製版方法
DE102021125071A1 (de) * 2020-10-22 2022-04-28 Heidelberger Druckmaschinen Aktiengesellschaft Vorrichtung zum Vermessen von Erhebungen der Oberfläche eines Rotationskörpers

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2170314A (en) 1984-10-22 1986-07-30 Zed Instr Ltd Measurement of depth or relief
WO2008049500A2 (fr) 2006-10-23 2008-05-02 Fischer & Krecke Gmbh Presse rotative et procédé pour ajuster un de ses cylindres
US20110076613A1 (en) * 2009-09-30 2011-03-31 Fujifilm Corporation Resin composition for laser engraving, relief printing plate precursor for laser engraving and method for producing the same, and relief printing plate and method for making the same
MX2010000925A (es) 2010-01-22 2011-07-21 Redi Color S A De C V Instrumento de medición de espesor, relieve, profundidad de punto y registros en placas para impresión.
US20130075376A1 (en) * 2011-09-26 2013-03-28 Norimasa Shigeta Relief printing plate manufacturing method, relief printing plate creating apparatus, and recording medium
EP3465169B1 (fr) 2016-05-30 2021-09-29 Bobst Mex Sa Système de capture d'image et procédé permettant de déterminer la position d'une structure en relief sur un élément en feuille
DE102020111341A1 (de) 2019-05-09 2020-11-12 Heidelberger Druckmaschinen Aktiengesellschaft Vorrichtung zum Vermessen von Erhebungen der Oberfläche eines Rotationskörpers
EP3822080B1 (fr) 2019-11-18 2023-04-26 Bobst Bielefeld GmbH Procédé de détermination des paramètres d'impression d'une machine d'impression et banc d'essai

Also Published As

Publication number Publication date
DE102023136188A1 (de) 2025-06-26
US20250206011A1 (en) 2025-06-26
CN120191118A (zh) 2025-06-24

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