EP3013587A1 - Messelement sowie vorrichtung und verfahren zur einstellung oder kontrolle eines anstelldruckes - Google Patents
Messelement sowie vorrichtung und verfahren zur einstellung oder kontrolle eines anstelldruckesInfo
- Publication number
- EP3013587A1 EP3013587A1 EP14735470.8A EP14735470A EP3013587A1 EP 3013587 A1 EP3013587 A1 EP 3013587A1 EP 14735470 A EP14735470 A EP 14735470A EP 3013587 A1 EP3013587 A1 EP 3013587A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- printing
- measuring element
- pressure
- flexographic printing
- image
- 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.)
- Withdrawn
Links
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
- B41F33/0072—Devices for measuring the pressure between cylinders or bearer rings
-
- 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
- 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
- B41F5/00—Rotary letterpress machines
- B41F5/24—Rotary letterpress machines for flexographic printing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0061—Force sensors associated with industrial machines or actuators
- G01L5/0076—Force sensors associated with manufacturing machines
- G01L5/0085—Force sensors adapted for insertion between cooperating machine elements, e.g. for measuring the nip force between rollers
Definitions
- the invention relates to a measuring element for flexographic printing elements for controlling a contact pressure against a substrate.
- the invention also relates to a device for adjusting a contact pressure of a flexographic printing element with respect to a printing substrate, in which a measuring element is arranged on the flexographic printing element.
- the invention likewise relates to a method for controlling a setting pressure of a flexographic printing element with respect to a printing substrate carrier.
- Flexographic printing is a high-pressure process in which all printing elements are elevated and at the same level. Non-image parts or non-printing elements are recessed in relation to the printing elements. With a Einfärbewalze, the so-called anilox roller, the printing elements of the flexographic printing elements are colored. After the inking of the printing elements or the printing form, a transfer to the printing material takes place. In order to ensure a uniform ink transfer from the printing element to the substrate, a minimum pressure is required, which is ensured by a contact pressure of the printing elements relative to the printing substrate.
- the inking of the printing elements is carried out via a roller, the printing elements themselves are arranged on a printing roller, the printing material runs on the surface of the printing roller on the flexographic printing element, so that the contact pressure between the flexographic printing element and the printing material carrier by an assignment of the pressure roller relative to the Substrate roll takes place.
- the flexographic printing elements or the cliché are elastic and are deformed by the contact pressure, so that also deform the print image elements. As the setting pressure increases, the deformation becomes stronger so that the printing elements print wider, which may cause the printed image to become imprecise. If the setting pressure and thus also the contact pressure of the printing material are too low compared to the flexographic printing elements, the ink transfer is uneven.
- the minimum contact pressure is set by the operating personnel at the respective printing machine. In order to perform a precise adjustment, it requires an experienced operating personnel, whereby the adjustment of the contact pressure of individual components is dependent. To assist the operating personnel, it is provided to arrange a measuring element next to the cliché, which has fine parallel or concentric lines. If the contact pressure becomes too great, the printed image elements deform so much that the gaps disappear. This is an indication of excessive contact pressure. However, the disappearance of lines can also have other causes, such as dirt or deposits of color pigments, so that a reliable display is not possible. In addition, the fine lines are difficult to recognize.
- the object of the present invention is therefore to provide a measuring element for flexographic printing elements, a device for adjusting the contact pressure of a flexographic printing element with respect to a substrate and a method for controlling a contact pressure of a flexographic printing element, with which a quick detection of a minimum pressure or a limit pressure possible is to ensure a safe ink transfer while avoiding overpressing.
- the measuring element according to the invention for controlling a setting pressure relative to a substrate carrier provides for a plurality of pressure planes decreasing in height and not overlapping in the area.
- This configuration makes it possible to provide a graduated measuring element, similar to a pyramid, in which the lower lying pressure planes, for example increase in size or at least not completely covered by the overlying printing plane, so that depending on the Anstelltik in the Size and / or shape changed Print image results.
- the first level of the measuring element first prints as soon as there is contact with the inking component, for example the anilox roller, and subsequently the measuring element comes into contact with the printing material.
- the contact pressure existing at the first printing contact is usually not sufficient to ensure a uniform pressure for the actual printing motif, so that the pressure between the printing substrate and the flexographic printing element is increased until at least one more or several lower ones Print layers.
- the desired or selected Anstelltik is reached, which is sufficient, on the one hand to ensure a uniform ink transfer and on the other hand, a precise print image.
- the shape and / or orientation of the pressure surfaces of the measuring element may be different in the different planes, so that, for example, a triangle is printed in the first plane, a square in the following, and a circle in the third, lowest printing plane.
- detection of the setting pressure is not only possible by increasing the size of the pyramid-shaped pressure surfaces in decreasing pressure levels, but also by simply detecting different shapes or orientations of forms.
- the pressure planes of the measuring element are advantageously uniformly spaced in relation to each other so that a finely graded, uniform change of the setting pressure can be represented by the measuring element on the basis of the changing printed areas, orientations or shapes.
- a decreasing distance of the printing planes in the direction of the Zielanstelltik is provided in order to enable the finest possible and precise adjustment.
- the measuring element is advantageously arranged next to a printing motif on the flexographic printing element in order not to impair the actual printing motif.
- the inventive device for adjusting a contact pressure of a Flexographic printing element relative to a printing substrate, in which on the flexographic printing element, a measuring element, as described above, is arranged provides that an image capture device is assigned to the substrate for detecting the print image of the measuring element on the substrate. Via the image capture device, it is possible to detect the shape and / or size of the print image of the measuring element, so that an optical measurement of the contact pressure can be achieved via an image comparison.
- a specific print image of the measuring element for example a size or a shape, is assigned a specific setting pressure. If a certain print result of the measuring element is reached, the desired Anstelltik is present, a deviating print image is detected, the desired Anstelltik is not set and can be corrected. Due to the shape and / or size of the printed image of the measuring element is a qualitative and quantitative statement about it possible in which direction the Anstelltik must be changed and how big the change should be made.
- the image capture device can be assigned an evaluation device for the image data, so that an automatic image analysis can take place.
- a comparator can be integrated in or associated with the device, which compares the acquired image data with previously stored patterns, so that it can be detected by a simple pattern comparison how and to what extent the setting pressure must be varied.
- An output unit may be present which outputs a signal in the event of a deviation between a nominal value and an actual value or upon reaching a nominal value for image data of the measuring element.
- the output unit may output an audible and / or visual signal indicating to the operator what condition the printing press is in and whether and in which direction the apply pressure must be changed.
- a development of the invention provides that a control device and an actuator for changing the Anstelldruckes the image capture device is assigned, so automatically after the image acquisition and image analysis can be suitably changed over the actuator of the contact pressure.
- the inventive method for controlling a contact pressure of a Flexodru- ckimplantations against a substrate with a device described above provides that the printed image of the measuring element detected and the contact pressure is set in dependence on the evaluated print image of the measuring element.
- the contact pressure can be adjusted depending on the size and / or shape of the printed image of the measuring element.
- Figure 1- a schematic representation of a printing unit; and Figure 2 - a detailed view of a measuring element, and Figure 3 - a variant of the measuring element.
- FIG. 1 shows a schematic representation of a printing unit with a printing form support designed as a printing form cylinder 1 with a flexographic printing element 11 arranged on the surface of the printing form support.
- the printing form cylinder 1 rotates about its axis, on the surface of the flexographic printing element 11 runs from a substrate 4, which is pressed via a counter-pressure cylinder 2 as a substrate for printing against the flexographic printing element 11 on the printing form cylinder 1.
- an anilox roller 3 is arranged on the opposite side of the impression cylinder 2 side of the plate cylinder 1, which is associated with a chambered doctor blade system 5.
- the respective cylinder axes are arranged parallel to one another.
- the contact pressure between the plate cylinder 1 and the impression cylinder 2 and thus the flexographic printing element 11 relative to the substrate 4 is freely adjustable, as is the contact pressure of the anilox roller 3 against the flexographic printing element 11 adjustable.
- the illustrated printing unit is a direct one Hochd jerking process in web-fed rotary printing, in which flexible printing plates are attached as flexographic printing elements 11 on the printing form cylinder 1.
- the flexographic printing elements may consist of a photopolymer or rubber and are wetted with low viscosity inks.
- the raised areas of the flexographic printing elements 11 are image-bearing, that is, the colors that are located on the raised areas of the flexographic printing elements 11, are printed on the substrate web 4.
- flexographic printing elements for example flat flexographic printing elements, in addition to the web-fed rotary printing process.
- the anilox roller 3 associated chamber doctor blade system 5 color is continuously applied to the rotating screen roller 3.
- the amount of ink supplied is regulated and ensured a uniform application of ink over the entire anilox roll length.
- the ink is applied by rolling onto the counter-rotating flexographic printing element 11 on the printing form cylinder 1.
- the raised areas of the flexographic printing element 11 print the motif on the printing material web.
- a different printing behavior occurs. If the setting pressure relative to the printing material web 4 is too low, an uneven transfer of ink from the flexographic printing element 11 to the printing material web 4 takes place. If the contact pressure is too great, the elastic flexographic printing elements deform, which leads to a change in the printed image.
- the raised areas of the flexographic printing element 11 deform too much, so that the precision of the printed image suffers, the raised areas print too wide.
- an actuator 14 is assigned to the plate cylinder 1 in the illustrated embodiment, alternatively, it is possible to equip the impression cylinder 2 or both rollers with a corresponding actuator to effect a displacement of the axes toward or away from each other.
- the anilox roller 3, the printing form cylinder 1 and the counter-pressure cylinder 2 can be mounted in a common machine frame and individually or mutually coupled to each other displaced.
- the actuator 14th is assigned a control device 15, via which the degree and the direction of the adjustment can be controlled.
- An output unit 13 can also be provided on the control device 15, via which a signal for a deviation between a setpoint value and an actual value of the set-up pressure or upon reaching a setpoint value of a set-up pressure can be output.
- an image capture unit 10 which receives the printing material 4 after printing, wherein the image capture device 10, which is usually designed as a camera, an evaluation device 12 is assigned, via which the image data in position, shape and / or size or color intensity can be checked.
- the check of the contact pressure is done by detecting a print image of a measuring element, which will be explained below.
- Figure 2 shows an embodiment of a measuring element 6 according to the invention, which is arranged on a flexographic printing element 11, advantageously next to the actual motif to be printed on the substrate 4.
- the measuring element 6 provides in the illustrated embodiment 3 pressure levels 7, 8, 9, which are formed raised at different levels.
- the topmost printing plane 7 has a square structure and represents the top of a pyramidal structure.
- the first printing plane 7 prints first as soon as contact with the printing substrate 4 takes place, after the flexographic printing element 11 has been provided together with the measuring element 6 via the anilox roller with ink. If only the first printing plane 7 comes into contact with the printing substrate 4, the contact pressure is usually not large enough to ensure a uniform ink transfer for the subject on the flexographic printing element 11.
- the upper printing plane 7 may be arranged at the level of the printing surfaces of the flexographic printing element 1, so that upon initial contact with the printing substrate 4 there is a corresponding printing result of both the actual printing motif and the measuring element. Accordingly, a higher contact pressure is set, which leads to a compression of the elastic measuring element 6, so that the second printing plane 8 also participates in the printed image of the measuring element 6. If the second printing plane 8 of the measuring element 6 can be seen completely on the printing substrate 4, it can be assumed that the correct, predetermined setting pressure has been reached.
- the second printing plane 8 of the measuring element 6 is likewise of square construction and also corresponds to the orientation of the first printing plane 6, but the surface is enlarged in relation to the first printing plane 7.
- the third printing plane 9 of the measuring element 6 also has a square shape in the same orientation as the raised pressure planes 7 and 8 and is opposite to the second Printing level 8 also enlarged. If it is detected via the image capture device 10 that the deepest printing plane 9 transfers color to the printing substrate 4, this is a sign that the setting pressure is too great and thus the distance between the flexographic printing element 11 and the printing substrate 4 or between the printing form cylinder 1 and to enlarge the impression cylinder 2.
- the image capturing device 10 monitors the pressure or the setting pressure permanently by monitoring the region in which the measuring element 6 prints, for example an edge region of the printing material 4, by the image capturing device 10 in the form of a camera.
- the data captured by the camera are evaluated by means of an evaluation device 12 in terms of shape, orientation and / or size and, if appropriate, compared with previously stored patterns via a comparator integrated in the evaluation device 12. If only the first printing plane 7 is printed and a corresponding printed image is detected, a comparison can be made in the evaluation device 12.
- an evaluation drive 14 for adjusting the distance between the evaluation device 12 and a control device 15 can be used for automatic setting of the setting pressure. rule the printing form cylinder 1 and the impression cylinder 2 done.
- the particular pressure level of the measuring element 6 can be assigned a specific value of the contact pressure or at least an increment of the Anstelltikivess, so that can be detected in a multi-stage embodiment of the measuring element 6, by how much the contact pressure increased or decreased or by which way and in which direction the printing form cylinder 1 must be moved to the impression cylinder 2 in order to achieve the desired contact pressure.
- FIG. 3 shows a variant of the measuring element 6 in which different shapes are present in the different pressure planes 7, 8, 9.
- the uppermost printing plane 7 is formed as a circle, the middle printing plane 8 as a triangle and the lower printing plane 9 as a square.
- Alternative forms are of course possible, as well as different sequences are possible, it must be ensured that a change in the printed image in the different layers of pressure is optically detectable, which is achieved regularly by the fact that in the next lower level printing a print surface is added or a in the projection projecting area proportion transfers ink.
- the different pressure planes 7, 8, 9 can be arranged at equal distances from each other, it is also possible that in the pressure plane representing the correct Anstelltik adjacent pressure planes are arranged at a smaller distance than farther away, to facilitate a fine adjustment. It is also possible to provide more than three pressure levels to allow a finer adjustment.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013010763.6A DE102013010763B4 (de) | 2013-06-28 | 2013-06-28 | Messelement sowie Vorrichtung und Verfahren zur Einstellung oder Kontrolle eines Anstelldruckes |
PCT/EP2014/001765 WO2014206571A1 (de) | 2013-06-28 | 2014-06-27 | Messelement sowie vorrichtung und verfahren zur einstellung oder kontrolle eines anstelldruckes |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3013587A1 true EP3013587A1 (de) | 2016-05-04 |
Family
ID=51063395
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14735470.8A Withdrawn EP3013587A1 (de) | 2013-06-28 | 2014-06-27 | Messelement sowie vorrichtung und verfahren zur einstellung oder kontrolle eines anstelldruckes |
Country Status (4)
Country | Link |
---|---|
US (1) | US9855739B2 (de) |
EP (1) | EP3013587A1 (de) |
DE (1) | DE102013010763B4 (de) |
WO (1) | WO2014206571A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014101433B4 (de) | 2014-02-05 | 2016-03-24 | CONPRINTA GmbH & Co. KG | Druckwerk für eine Flexodruckmaschine und Verfahren zu dessen Betrieb |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63191638A (ja) * | 1987-02-04 | 1988-08-09 | Toppan Printing Co Ltd | 印刷物の見当合わせ方法 |
SE523530C2 (sv) | 2001-09-24 | 2004-04-27 | Rng I Lund Ab | Förfarande och anordning för mätning av nypet mellan två valsar |
DE10321360B3 (de) | 2003-05-13 | 2004-10-28 | Koenig & Bauer Ag | Anordnung eines Sensors an einem Rotationskörper sowie Rotationskörper |
ES2264390B1 (es) * | 2005-06-10 | 2008-03-01 | Comexi, S.A. | Metodo para ajustar automaticamente la presion de impresion en maquinas impresoras flexograficas. |
DE102008025287A1 (de) | 2008-05-27 | 2009-12-03 | SID Sächsisches Institut für die Druckindustrie GmbH Institut des Vereins POLYGRAPH Leipzig e.V. | Vorrichtung zur Messung von Pressungskenngrößen im Spalt zwischen zylindrischen Körpern |
DE102010000907B4 (de) * | 2010-01-14 | 2015-09-10 | Windmöller & Hölscher Kg | Verfahren und Vorrichtung zum Optimieren der Relativposition zumindest zweier Druckwerkszylinder |
DE102011001920B4 (de) * | 2011-04-08 | 2013-08-29 | Page Factory Offset-Coating-Service Gmbh | Verwendung eines Kontrollstreifens für eine Lackdruckform, und Verfahren zum Lackdruck |
DE102011122932B3 (de) * | 2011-04-08 | 2013-10-24 | PAGE factory offset coating-service GmbH | Kontrollstreifen für eine Lackdruckform und Lackdruckform |
WO2013063173A1 (en) * | 2011-10-25 | 2013-05-02 | Unipixel Displays, Inc. | Flexographic printing using flexographic printing roll configurations |
-
2013
- 2013-06-28 DE DE102013010763.6A patent/DE102013010763B4/de active Active
-
2014
- 2014-06-27 US US14/900,391 patent/US9855739B2/en active Active
- 2014-06-27 EP EP14735470.8A patent/EP3013587A1/de not_active Withdrawn
- 2014-06-27 WO PCT/EP2014/001765 patent/WO2014206571A1/de active Application Filing
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO2014206571A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102013010763A1 (de) | 2014-12-31 |
US20160159082A1 (en) | 2016-06-09 |
WO2014206571A1 (de) | 2014-12-31 |
US9855739B2 (en) | 2018-01-02 |
DE102013010763B4 (de) | 2016-01-07 |
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