EP0671264A1 - Method for measuring on flexographic printing plates - Google Patents

Method for measuring on flexographic printing plates Download PDF

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Publication number
EP0671264A1
EP0671264A1 EP95102611A EP95102611A EP0671264A1 EP 0671264 A1 EP0671264 A1 EP 0671264A1 EP 95102611 A EP95102611 A EP 95102611A EP 95102611 A EP95102611 A EP 95102611A EP 0671264 A1 EP0671264 A1 EP 0671264A1
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EP
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Prior art keywords
light
flexographic printing
inking
printing plates
angle
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EP95102611A
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German (de)
French (fr)
Inventor
Hans-Godehard Pallingen
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Viptronic SRL
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Viptronic SRL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0027—Devices for scanning originals, printing formes or the like for determining or presetting the ink supply

Definitions

  • Densitometric measurements and checks on control strips of color prints or directly on the color prints are known in order to optimize the print quality during the production phase and to have a technically reliable instrument for the purpose of continuously ensuring a certain print quality.
  • the invention proposes the use of a measuring method which is based on the reflection of a bundle of visible or invisible, mutually parallel light beams which strike a surface and thereby enable the entire inking surface of the halftone dots on a unit surface of a dot or To raise the line screen by measuring the light reflected from the colored areas of the screen dots.
  • the invention proposes the use of a light source provided with an aperture and one or more lenses in order to produce a bundle with parallel light beams which is directed at an angle of incidence of approximately 30 ° onto the inking surfaces of the halftone dots or halftone lines of a flexographic printing plate.
  • these reflected rays strike a light-sensitive receiver element which at the end A tube is provided, the longitudinal axis of which, with respect to the emitted beam, is arranged at an angle which corresponds to the sum between the angle of incidence and the angle of reflection, in this way only those rays reach the photosensitive element which are reflected parallel to one another and at a certain angle.
  • the light rays emitted by the light source which will hit the sides or the bottom of the depressions of the flexographic printing plate between the raised screen dots, will, due to the different angle of incidence, be reflected in a noticeably different direction with respect to the rays reflected by the inking surfaces thus do not strike the light-sensitive receiver element at the end of the tube, which is aligned with the rays reflected from the inking surfaces.
  • the rays that do not strike the inking surfaces are refracted (refraction of the light when penetrating media of different densities) and are only reflected to a small extent during penetration and exit from the surface of the translucent material; in any case, even these partially reflected beams will not have the appropriate angle of reflection to reach the light-sensitive receiver element.
  • the measuring method according to the invention is suitable for carrying out measurements on any type of flexographic printing plates, regardless of their material properties, their composition or stratification, since it is based on the measurement of the change in one electrical unit depending on the light intensity, which strikes, for example, a light diode as the receiver element.
  • the calibration of the measuring device described is only necessary for a 100% coloration, in which, because of the possible surface irregularity and because of the often uneven quality of the plates, which are produced in a variety of materials, layers and different structures, repeated several times for the same measuring point is and / or may have to be carried out frequently by changing different measuring points; the individual measured values are saved and the calibration is carried out according to the mean value.
  • the invention provides for the possibility of electronic compensation using a differentiated compensation coefficient; this can be related to the value measured and / or related to the fineness of the grid.
  • FIG. 1 shows a diagram of the measuring optics of a device which works on flexographic printing plates according to the measuring method according to the invention.
  • FIG. 2 is a graphic representation of the divergence between the theoretical coloring values ascertained by the method according to the invention, without the use of correction coefficients.
  • the light emitted by the light source 1 is calibrated through the aperture 2 and refracted by the lens 3 in such a way that a bundle of parallel light beams L is generated which is applied to the colored flexographic printing plate 4 to be checked with a Angle of incidence of approx. 30 °.
  • the diaphragm 2 can also be attached after the lens 3, the diaphragm can have a fixed or an adjustable opening, the use of several diaphragms not being excluded, the lens 3 can also be replaced by a plurality of lenses or by a concave mirror.
  • Part of the light rays L are reflected by the inking surfaces 4a with a drop angle r which is equal to the angle of incidence i, these are selected by a tube 5 which is aligned with its longitudinal axis coaxially to the axis of the reflected beam so that only those reflected by the inking surfaces are parallel rays a light-sensitive element 6, for example a photodiode.
  • the sheet 4 of translucent material is placed on an absorbent surface A, e.g. in matt black color, laid or attached; however, the translucent printing plates are often already provided with an opaque, non-reflective layer.
  • the measuring element operating according to the method according to the invention thus consists of an optical transmitter part 1, 2, 3 and a receiver part 5, 6; these two parts can be fixed, namely with the axis of the beam L and that of the reflected beams R lying in a common plane and with each other at an angle t which is the sum of the angle of incidence i and the angle of reflection r and whose angular symmetry is perpendicular to the surface containing the coloring surfaces 4a.
  • the two units transmitter unit, receiver unit
  • the receiver element 6 is advantageous of the light-sensitive type which, through the change in the light intensity to which it is exposed, results in the strictly corresponding change in any electrical unit of measurement.
  • These electrical variables can be amplified in a known manner and, if necessary, modified in a differentiated manner for the purpose of aligning the measured values M to the theoretical values T, taking into account the deviations E.
  • different correction coefficients can be used, depending on the type of grid.
  • the final values can e.g. on a display, it can be provided that the values of a series of measurements are stored in order to show the mean value.
  • the calibration of the measuring device operating according to the measuring method according to the invention is advantageously carried out taking into account a measuring field on the printing plate with 100% inking, and this is done by repeating a few measurements at the same point or at several points in the same measuring field.
  • the invention does not exclude the integration of the measuring system according to the invention on flexographic printing plates in a device for densitometric measurements.

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  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Abstract

The method involves shining a parallel rays of visible or invisible light on the inking surfaces (4a) of a printing plate (4) at defined angle and reflecting the light to a light sensitive receiver element (6). This causes an intensity dependent change in the signal in an electrical unit which is amplified and processed into a form suitable for numerical and/or graphical display. The beam (L) is emitted by a source and calibrated with at least one aperture with a fixed or variable opening arranged before or after a lens or group of lenses, which refracts the light to produce a beam of parallel rays.

Description

Es sind densitometrische Messungen und Überprüfungen an Kontrollstreifen von Farbdrucken oder direkt an den Farbdrucken bekannt um, während der Produktionsphase, die Druckqualität zu optimieren und um über ein technisch zuverlässiges Instrument, zwecks kontinuierlicher Sicherung einer bestimmten Druckqualität, zu verfügen.Densitometric measurements and checks on control strips of color prints or directly on the color prints are known in order to optimize the print quality during the production phase and to have a technically reliable instrument for the purpose of continuously ensuring a certain print quality.

Beim Flexodruck, welcher für den Druck von Werbematerial in hoher Auflage, für Zeitungsdruck und für Verpackungsdruck und somit für den Druck von traditionell eher niedrigerem Qualitätsniveau Anwendung findet, besteht ein wachsendes Bedürfnis an Druckqualität, was die Schaffung eines Meßinstrumentes erfordert welches in der Lage ist die Einfärbfläche der Flexodruckplatten zu erfassen.In flexographic printing, which is used for the printing of advertising material in large quantities, for newspaper printing and for packaging printing and thus for the printing of traditionally rather lower quality levels, there is a growing need for printing quality, which requires the creation of a measuring instrument which is capable of Capture the inking area of the flexographic printing plates.

Die Erfindung schlägt zur Lösung dieser Aufgabe die Anwendung eines Meßverfahrens vor, welches auf die Reflexion eines Bündels sichtbarer oder unsichtbarer, zueinander paralleler, Lichtstrahlen basiert, welche auf eine Fläche auftreffen und dabei es ermöglichen die gesamte Einfärbfläche der Rasterpunkte auf einer Einheitsfläche eines Punkte- oder Linienrasters zu erheben indem das, von den Einfärbflächen der Rasterpunkte, refektierte Licht gemessen wird.To achieve this object, the invention proposes the use of a measuring method which is based on the reflection of a bundle of visible or invisible, mutually parallel light beams which strike a surface and thereby enable the entire inking surface of the halftone dots on a unit surface of a dot or To raise the line screen by measuring the light reflected from the colored areas of the screen dots.

Die Erfindung schlägt den Einsatz einer mit Blende und einer oder mehrerer Linsen versehenen Lichtquelle vor um ein Bündel mit parallelen Lichtstrahlen zu erzeugen welches in einem Einfallswinkel von ca.30° auf die Einfärbflächen der Rasterpunkte oder Rasterlinien einer Flexodruckplatte gerichtet ist.The invention proposes the use of a light source provided with an aperture and one or more lenses in order to produce a bundle with parallel light beams which is directed at an angle of incidence of approximately 30 ° onto the inking surfaces of the halftone dots or halftone lines of a flexographic printing plate.

Nur jene Strahlen welche auf die Einfärbflächen der Rasterpunkte oder Rasterlinien treffen werden mit einem Ausfallwinkel reflektiert welcher gleich dem Einfallswinkel ist; diese reflektierten Strahlen sind also in direktem Verhältnis zur Einfärbfläche einer bestimmten Fläche der Flexodruckplatte. Erfindungsgemäß treffen diese reflektierten Strahlen auf ein lichtempfindliches Empfängerelement welches am Ende eines Rohres vorgesehen ist deren Längsachse, in Bezug auf das ausgesandte Strahlenbündel, in einem Winkel angeordnet ist welcher der Summe zwischen Einfallswinkel und Ausfallwinkel entspricht, auf diese Weise erreichen nur jene Strahlen das lichtempfindliche Element welche parallel zueinander und in einem bestimmten Winkel reflektiert werden.Only those rays that hit the inking areas of the halftone dots or halftone lines are reflected with an angle of reflection that is equal to the angle of incidence; these reflected rays are therefore directly related to the inking surface of a specific surface of the flexographic printing plate. According to the invention, these reflected rays strike a light-sensitive receiver element which at the end A tube is provided, the longitudinal axis of which, with respect to the emitted beam, is arranged at an angle which corresponds to the sum between the angle of incidence and the angle of reflection, in this way only those rays reach the photosensitive element which are reflected parallel to one another and at a certain angle.

Die von der Lichtquelle ausgesandten Lichtstrahlen welche auf die Seiten oder den Grund der, zwischen den erhabenen Rasterpunkte vorhandenen, Vertiefungen der Flexodruckplatte auftreffen werden also, wegen des unterschiedlichen Einfallswinkels, in einer, betreffend die von den Einfärbflächen reflektierten Strahlen, merklich abweichenden Richtung reflektiert und werden somit nicht auf das lichtempfindliche Empfängerelement am Ende des Rohres, welches nach den von den Einfärbflächen reflektierten Strahlen ausgerichtet ist, auftreffen. Im Falle von Flexodruckplatten aus lichtdurchlässigem Material werden die Strahlen welche nicht auf die Einfärbflächen auftreffen gebrochen (Brechen des Lichtes beim Durchdringen von Mitteln unterschiedlicher Dichte) und nur zu einem kleinen Anteil beim Eindringen und beim Austreten von der Oberfläche des lichtdurchlässigen Materials reflektiert; auf jeden Fall aber werden auch diese teilweise reflektierten Strahlen nicht den geeigneten Ausfallwinkel aufweisen um das lichtempfindliche Empfängerelement zu erreichen. Insbesondere im Falle von, aus lichtdurchlässigem Material hergestellten, Flexodruckplatten ist es ratsam diese auf eine lichtabsorbierende Unterlage (mattschwarz) zu positionieren um auf jeden Fall auch diese partiellen Reflexe zu begrenzen; öfters sind Flexodruckplatten bereits mit lichtundurchlässigem, absorbierendem Material beschichtet.The light rays emitted by the light source, which will hit the sides or the bottom of the depressions of the flexographic printing plate between the raised screen dots, will, due to the different angle of incidence, be reflected in a noticeably different direction with respect to the rays reflected by the inking surfaces thus do not strike the light-sensitive receiver element at the end of the tube, which is aligned with the rays reflected from the inking surfaces. In the case of flexographic printing plates made of translucent material, the rays that do not strike the inking surfaces are refracted (refraction of the light when penetrating media of different densities) and are only reflected to a small extent during penetration and exit from the surface of the translucent material; in any case, even these partially reflected beams will not have the appropriate angle of reflection to reach the light-sensitive receiver element. Particularly in the case of flexographic printing plates made of translucent material, it is advisable to position them on a light-absorbing surface (matt black) in order to limit these partial reflections in any case; Flexographic printing plates are often already coated with opaque, absorbent material.

Das erfindungsgemäße Meßverfahren eignet sich für die Durchführung von Messungen an jeglicher beliebigen Art von Flexodruckplatten, unabhängig von ihrer Materialbeschaffenheit, von ihrer Zusammensetzung oder Schichtung da es auf der Messung der Veränderung einer elektrischen Einheit in Abhängigkeit der Lichtintensität welche, z.B. auf eine Lichtdiode als Empfängerelement trifft, basiert.The measuring method according to the invention is suitable for carrying out measurements on any type of flexographic printing plates, regardless of their material properties, their composition or stratification, since it is based on the measurement of the change in one electrical unit depending on the light intensity, which strikes, for example, a light diode as the receiver element.

Die Eichung des beschriebenen Meßgerätes ist nur bei einer 100% Einfärbung erforderlich, bei welcher wegen der möglichen Oberflächenunregelmäßigkeit und wegen der häufig ungleichen Qualität der Platten, welche in einer Vielzahl von Materialien, Schichtungen und unterschiedlichem Aufbau hergestellt werden, mehrmals für die gleiche Meßstelle zu wiederholen ist und/oder eventuell unter Wechsel unterschiedlicher Meßpunkte öfters durchzuführen ist; die einzelnen erhobenen Meßwerte werden dabei gespeichert und die Eichung erfolgt gemäß dem Mittelwert.The calibration of the measuring device described is only necessary for a 100% coloration, in which, because of the possible surface irregularity and because of the often uneven quality of the plates, which are produced in a variety of materials, layers and different structures, repeated several times for the same measuring point is and / or may have to be carried out frequently by changing different measuring points; the individual measured values are saved and the calibration is carried out according to the mean value.

Die Praxis hat gezeigt, daß eine maximale Abweichung zwischen den erhobenen Werten und den effektiven Werten bei der Erhebung der Werte mittlerer Einfärbung auftreten, deshalb sieht die Erfindung die Möglichkeit eines elektronischen Ausgleiches unter Anwendung eines differenzierten Ausgleichkoeffizienten vor; dieser kann auf den erhobenen Wert bezogen sein und/oder auf den Feinheitsgrad des Rasters bezogen sein.Practice has shown that there is a maximum deviation between the measured values and the effective values when collecting the values of medium coloring, therefore the invention provides for the possibility of electronic compensation using a differentiated compensation coefficient; this can be related to the value measured and / or related to the fineness of the grid.

Die Erfindung wird nachstehend anhand eines Funktionsschemas des erfindungsgemäßen Meßverfahrens an Flexodruckplatten, welches in der beigelegten Zeichnung schematisch dargestellt ist, näher erklärt; dabei erfüllt die Zeichnung rein erklärenden, nicht begrenzenden Zweck.The invention is explained in more detail below on the basis of a functional diagram of the measurement method according to the invention on flexographic printing plates, which is shown schematically in the accompanying drawing; the drawing serves a purely explanatory, non-limiting purpose.

Die Fig.1 zeigt ein Schema der Meßoptik eines Gerätes welches nach dem erfindungsgemäßen Meßverfahren an Flexodruckplatten funktioniert.1 shows a diagram of the measuring optics of a device which works on flexographic printing plates according to the measuring method according to the invention.

Die Fig.2 ist eine graphische Darstellung der Divergenz zwischen den nach dem erfindungsgemäßen Verfahren erhobenen und den theoretischen Einfärbungswerten, ohne Anwendung von Korrekturkoeffizienten.FIG. 2 is a graphic representation of the divergence between the theoretical coloring values ascertained by the method according to the invention, without the use of correction coefficients.

Das von der Lichtquelle 1 ausgesandte Licht wird durch die Blende 2 kalibriert und durch die Linse 3 so gebrochen, daß ein Bündel paralleler Lichtstrahlen L erzeugt wird welches auf die eingefärbte zu überprüfende Flexodruckplatte 4 mit einem Einfallswinkel von ca. 30° auftrifft. Natürlich kann die Blende 2 auch nach der Linse 3 angebracht sein, die Blende kann eine feststehende oder eine verstellbare Öffnung aufweisen, wobei der Einsatz von mehreren Blenden nicht ausgeschlossen wird, auch die Linse 3 kann durch mehrere Linsen oder durch einen Hohlspiegel ersetzt werden.The light emitted by the light source 1 is calibrated through the aperture 2 and refracted by the lens 3 in such a way that a bundle of parallel light beams L is generated which is applied to the colored flexographic printing plate 4 to be checked with a Angle of incidence of approx. 30 °. Of course, the diaphragm 2 can also be attached after the lens 3, the diaphragm can have a fixed or an adjustable opening, the use of several diaphragms not being excluded, the lens 3 can also be replaced by a plurality of lenses or by a concave mirror.

Teil der Lichtstrahlen L werden durch die Einfärbflächen 4a mit einem Ausfallwinkel r reflektiert welcher gleich dem Einfallswinkel i ist, diese werden durch ein Rohr 5 selektioniert welches mit seiner Längsachse koachsial zur Achse des reflektierten Strahlenbündels ausgerichtet ist so daß ausschließlich die, von den Einfärbflächen reflektierten, zueinander parallelen Strahlen ein lichtempfindliches Element 6, z.B. eine Fotodiode, erreichen.Part of the light rays L are reflected by the inking surfaces 4a with a drop angle r which is equal to the angle of incidence i, these are selected by a tube 5 which is aligned with its longitudinal axis coaxially to the axis of the reflected beam so that only those reflected by the inking surfaces are parallel rays a light-sensitive element 6, for example a photodiode.

Jene Strahlen L welche auf die Seitenflächen oder auf den Grund der Ausnehmungen 4c zwischen den erhabenen Einfärbflächen 4a treffen werden hingegen entweder, wegen des unterschiedlichen Einfallswinkels gemäß eines merklich unterschiedlichem Ausfallwinkel reflektiert oder werden, im Falle von lichtdurchlässigen Druckplatten 4, gebrochen D und zwar mit einer teilweisen Reflexion an der Eintrittsfläche und einer teilweisen Reflexion an der Austrittsfläche.Those rays L which hit the side surfaces or on the bottom of the recesses 4c between the raised inking surfaces 4a, on the other hand, are either reflected due to the different angle of incidence according to a noticeably different angle of reflection or, in the case of translucent printing plates 4, are refracted D with a partial reflection at the entrance surface and partial reflection at the exit surface.

Vorteilhafterweise wird die Platte 4 aus lichtdurchlässigem Material auf eine absorbierende Fläche A, z.B. in mattschwarzer Farbe, gelegt oder angebracht; öfters sind die lichtdurchlässigen Druckplatten jedoch bereits mit einer lichtundurchlässigen, nicht reflektierenden Schichtung versehen.Advantageously, the sheet 4 of translucent material is placed on an absorbent surface A, e.g. in matt black color, laid or attached; however, the translucent printing plates are often already provided with an opaque, non-reflective layer.

Das nach dem erfindungsgemäßen Verfahren arbeitende Meßorgan besteht also aus einem optischen Sendeteil 1, 2, 3 und aus einem Empfängerteil 5, 6; diese beiden Teile können fest angebracht sein und zwar mit der Achse des Strahlenbündels L und jener der reflektierten Strahlen R in einer gemeinsamen Ebene liegend und zueinander in einem Winkel t welcher die Summe des Einfallswinkel i und des Ausfallwinkels r ist und dessen Winkelsymmetrale senkrecht zur, die Einfärbflächen 4a enthaltenden, Fläche ist. Natürlich können die zwei Einheiten (Sendeeinheit, Empfängereinheit) auch zueinander beweglich angeordnet sein so daß der Einfallswinkel veränderbar ist.The measuring element operating according to the method according to the invention thus consists of an optical transmitter part 1, 2, 3 and a receiver part 5, 6; these two parts can be fixed, namely with the axis of the beam L and that of the reflected beams R lying in a common plane and with each other at an angle t which is the sum of the angle of incidence i and the angle of reflection r and whose angular symmetry is perpendicular to the surface containing the coloring surfaces 4a. Of course, the two units (transmitter unit, receiver unit) can also be arranged such that they can move relative to one another so that the angle of incidence can be changed.

Das Empfängerelement 6 ist vorteilhaft von der lichtempfindlichen Art die durch die Veränderung der Lichtintensität der es ausgesetzt ist, die streng entsprechende Veränderung einer beliebigen elektrischen Maßeinheit zur Folge hat. Diese elektrischen Variablen können auf bekannte Weise verstärkt und gegebenenfalls in differenzierter Art, zwecks der Angleichung der Meßwerte M an die theoretischen Werte T, unter Berücksichtigung der Abweichungen E, modifiziert werden. Weiters können unterschiedliche Korrekturkoeffizienten, je nach der jeweiligen Rasterart, zur Anwendung kommen. Die Endwerte können z.B. an einem Display, angezelgt werden wobei vorgesehen sein kann, daß die Werte einer Meßreihe gespeichert werden um den Mittelwert anzuzeigen. Die Eichung des, nach dem erfindungsgemäßen Meßverfahren arbeitenden Meßgerätes, erfolgt vorteilhaft unter Berücksichtigung eines Meßfeldes an der Druckplatte mit Einfärbung 100% und zwar unter Wiederholung einiger Messungen an der selben Stelle oder an mehreren Stellen des selben Meßfeldes.The receiver element 6 is advantageous of the light-sensitive type which, through the change in the light intensity to which it is exposed, results in the strictly corresponding change in any electrical unit of measurement. These electrical variables can be amplified in a known manner and, if necessary, modified in a differentiated manner for the purpose of aligning the measured values M to the theoretical values T, taking into account the deviations E. Furthermore, different correction coefficients can be used, depending on the type of grid. The final values can e.g. on a display, it can be provided that the values of a series of measurements are stored in order to show the mean value. The calibration of the measuring device operating according to the measuring method according to the invention is advantageously carried out taking into account a measuring field on the printing plate with 100% inking, and this is done by repeating a few measurements at the same point or at several points in the same measuring field.

Die Erfindung schließt nicht die Integration des erfindungsgemäßen Meßsystems an Flexodruckplatten in ein Gerät für densitometrische Messungen aus.The invention does not exclude the integration of the measuring system according to the invention on flexographic printing plates in a device for densitometric measurements.

Claims (4)

Meßverfahren an Flexodruckplatten zwecks Erhebung der Einfärbflächen von Punkterastern oder Linienrastern, dadurch gekennzeichnet, daß es in der Nutzung eines Strahlenbündels (L) sichtbaren oder nicht sichtbaren Lichtes besteht, wobei die Strahlen zueinander parallel verlaufen und auf die Einfärbflächen (4a) einer Druckplatte (4) mit einem bestimmten Einfallswinkel (i) auftreffen und folglich reflektiert auf ein lichtempfindliches Empfängerelement (6) auftreffen und dabei, in Abhängigkeit der Lichtintensität, eine Veränderung einer elektrischen Einheit bewirkt welche geeignet ist verstärkt und verarbeitet zu werden um numerisch und/oder graphisch auf einem Display oder Bildschirm angezeigt zu werden.Measuring method on flexographic printing plates for the purpose of ascertaining the inking areas of dot screens or line screens, characterized in that it consists in the use of a ray bundle (L) of visible or invisible light, the rays running parallel to one another and onto the inking areas (4a) of a printing plate (4) impinging with a certain angle of incidence (i) and consequently reflecting on a light-sensitive receiver element (6) and thereby, depending on the light intensity, causes a change in an electrical unit which is suitable for being amplified and processed in order to be numerically and / or graphically on a display or screen to be displayed. Meßverfahren an Flexodruckplatten gemäß Patentanspruch 1, dadurch gekennzeichnet, daß das Strahlenbündel zur Erhebung der Einfärbflächen von einer Lichtquelle (1) ausgesandt wird und von mindestens einer Blende (2) mit fixer oder variabler Durchlaßöffnung kalibriert wird welche vor oder nach einer Linse (3) oder Linsengruppe angebracht ist durch welche das ausgesandte Licht derart gebrochen wird, daß ein Bündel von zueinander parallelen Strahlen (L) entsteht.Measuring method on flexographic printing plates according to claim 1, characterized in that the radiation beam for raising the inking surfaces is emitted by a light source (1) and is calibrated by at least one aperture (2) with a fixed or variable passage opening which is in front of or after a lens (3) or Lens group is attached through which the emitted light is refracted such that a bundle of parallel rays (L) is created. Meßverfahren an Flexodruckplatten gemäß Patentanspruch 1, dadurch gekennzeichnet, daß das Bündel von zueinander parallelen Strahlen (L) von einer Lichtquelle ausgesandt wird die sich im Brennpunkt eines Hohlspiegels befindet und daß dieses Strahlenbündel durch eine Blende kalibriert wird.Measuring method on flexographic printing plates according to claim 1, characterized in that the bundle of mutually parallel beams (L) is emitted by a light source located in the focal point of a concave mirror and that this beam is calibrated by an aperture. Meßverfahren an Flexodruckplatten gemäß den Schutzansprüchen 1, 2 oder 3, dadurch gekennzeichnet, daß die von den Einfärbflächen (4a) reflektierten Strahlen (R) auf das lichtempfindliche Empfängerelement (6) auftreffen nachdem sie ein Rohr (5) durchlaufen welches mit seiner Längsachse in der selben Ebene wie die Achse des Bündels der zueinander parallelen Strahlen (L) liegt, welche auf die Einfärbflächen (4a) einfallen, daß diese gemeinsame Ebene senkrecht zu den Einfärbflächen (4a) ist und daß besagte Achsen einen Winkel (t) bilden welcher gleich der Summe zwischen dem Einfallswinkel (i) und den Ausfallwinkel (r) ist.Measuring method on flexographic printing plates according to protection claims 1, 2 or 3, characterized in that the rays (R) reflected by the inking surfaces (4a) strike the photosensitive receiver element (6) after they pass through a tube (5) which has its longitudinal axis in the same plane as the axis of the bundle of parallel rays (L) lying on the inking surfaces (4a) occur that this common plane is perpendicular to the coloring surfaces (4a) and that said axes form an angle (t) which is equal to the sum between the angle of incidence (i) and the angle of reflection (r).
EP95102611A 1994-03-08 1995-02-24 Method for measuring on flexographic printing plates Ceased EP0671264A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBZ940010 1994-03-08
IT94BZ000010A IT1278304B1 (en) 1994-03-08 1994-03-08 DETECTION SYSTEM ON FLEXOGRAPHIC PLATES.

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EP0671264A1 true EP0671264A1 (en) 1995-09-13

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IT (1) IT1278304B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008049510A1 (en) * 2006-10-23 2008-05-02 Hell Gravure Systems Gmbh & Co. Kg Method and apparatus for assessing the quality of at least one printing forme cylinder, and a production line which is equipped with an apparatus of this type
US11712886B2 (en) 2020-10-22 2023-08-01 Heidleberger Druckmaschinen Ag Device for measuring elevations on the surface of a rotary body and system
US11840059B2 (en) 2020-10-22 2023-12-12 Heidelberger Druckmaschinen Ag Device for measuring a surface of a rotary body or elevations thereof and system

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Publication number Priority date Publication date Assignee Title
DE1160398B (en) * 1961-06-28 1964-01-02 Schroers Co Textilausruest Method of predetermining the amount of an ink for printing a color pattern
FR1519883A (en) * 1967-02-24 1968-04-05 Etudes De Machines Speciales Device for measuring the longitudinal distribution of the inking rate of an inkwell of a rotary printing machine
FR2252926A1 (en) * 1973-11-29 1975-06-27 Vickers Ltd
EP0505769A1 (en) * 1991-03-25 1992-09-30 Heidelberger Druckmaschinen Aktiengesellschaft Method for the determination of area coincidence of a master, in particular a printing plate, as well as a device for carrying out the method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1160398B (en) * 1961-06-28 1964-01-02 Schroers Co Textilausruest Method of predetermining the amount of an ink for printing a color pattern
FR1519883A (en) * 1967-02-24 1968-04-05 Etudes De Machines Speciales Device for measuring the longitudinal distribution of the inking rate of an inkwell of a rotary printing machine
FR2252926A1 (en) * 1973-11-29 1975-06-27 Vickers Ltd
EP0505769A1 (en) * 1991-03-25 1992-09-30 Heidelberger Druckmaschinen Aktiengesellschaft Method for the determination of area coincidence of a master, in particular a printing plate, as well as a device for carrying out the method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008049510A1 (en) * 2006-10-23 2008-05-02 Hell Gravure Systems Gmbh & Co. Kg Method and apparatus for assessing the quality of at least one printing forme cylinder, and a production line which is equipped with an apparatus of this type
US11712886B2 (en) 2020-10-22 2023-08-01 Heidleberger Druckmaschinen Ag Device for measuring elevations on the surface of a rotary body and system
US11840059B2 (en) 2020-10-22 2023-12-12 Heidelberger Druckmaschinen Ag Device for measuring a surface of a rotary body or elevations thereof and system

Also Published As

Publication number Publication date
IT1278304B1 (en) 1997-11-17
ITBZ940010A1 (en) 1995-09-08
ITBZ940010A0 (en) 1994-03-08

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