EP2581227B1 - Farbwalze und Farbwalzensatz für Farbproofing - Google Patents

Farbwalze und Farbwalzensatz für Farbproofing Download PDF

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Publication number
EP2581227B1
EP2581227B1 EP20110185341 EP11185341A EP2581227B1 EP 2581227 B1 EP2581227 B1 EP 2581227B1 EP 20110185341 EP20110185341 EP 20110185341 EP 11185341 A EP11185341 A EP 11185341A EP 2581227 B1 EP2581227 B1 EP 2581227B1
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EP
European Patent Office
Prior art keywords
inking roller
pit
ink
roller
pits
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.)
Active
Application number
EP20110185341
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English (en)
French (fr)
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EP2581227A1 (de
Inventor
Wolfgang Brusdeilins
Gordon Whitelaw
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.)
Bobst Bielefeld GmbH
Original Assignee
Bobst Bielefeld GmbH
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Publication date
Application filed by Bobst Bielefeld GmbH filed Critical Bobst Bielefeld GmbH
Priority to ES11185341T priority Critical patent/ES2453917T3/es
Priority to EP20110185341 priority patent/EP2581227B1/de
Publication of EP2581227A1 publication Critical patent/EP2581227A1/de
Application granted granted Critical
Publication of EP2581227B1 publication Critical patent/EP2581227B1/de
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Classifications

    • 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
    • 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
    • B41N7/00—Shells for rollers of printing machines
    • B41N7/06—Shells for rollers of printing machines for inking rollers
    • 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
    • B41N2207/00—Location or type of the layers in shells for rollers of printing machines
    • B41N2207/02—Top layers

Definitions

  • the invention relates to a colour proofing method, wherein an inking roller or a set of inking rollers is used in a colour proofing apparatus for colour proofing by producing ink layers of different thickness.
  • EP 1 876 022 A2 and DE 10 2007 044 757 A1 each disclose an inking roller which has only a single pit array on its peripheral surface. Within this array, the pits have varying volumes, whereas the dam portions separating the pits all have the same width.
  • EP 0 428 893 A2 and EP 1 020 287 A2 disclose inking rollers wherein the volume of all the pits of the entire roller can be varied uniformly either by changing the temperature of the roller or by changing a pressure that is applied to an elastic layer underlying the pits.
  • ink layers of different thickness In order to produce ink layers of different thickness, it is possible to use a set of inking rollers which have pit arrays with different ink carrying capacities. It is also known to use an inking roller which has a plurality of different pit arrays on its peripheral surface, so that a number of ink layers with different thicknesses can be produced with a single roller.
  • the pit arrays are formed by pressing a diamond stamp into the surface layer of the roller, so that the surface material is subject to plastic deformation and a pit is left when the stamp is withdrawn.
  • the volume of the pits and, accordingly, the ink carrying capacity of the inking roller is controlled by controlling the depth to which the stamp is pressed into the roller surface.
  • the stamp typically has a pyramid shape, so that the footprint of the pit formed in the roller surface increases with increasing depth of the pit.
  • the pit density i.e. the number of pits per unit area, is typically the same for the different pit arrays, so that the ink carrying capacity, i.e. the total pit volume per unit area, is proportional to the volume of the individual pits, and the width of the dam portions that separate the individual pits from one another increases with decreasing pit volume.
  • EP 2 492 094 A1 which forms state of the art according to Art. 54(3) EPC, describes a colour proofing apparatus with an inking roller that has, on its peripheral surface, a plurality of screens in the form of pit arrays formed by pits that are separated from one another by dam portions, each of said pit arrays having a specific ink carrying capacity given by the total volume of the pits per unit area, said pit arrays being different from one another in the total volume of the pits per unit area.
  • the ink carrying capacity of the pit arrays can be varied only by varying the depth of the pits, without changing the footprint thereof, or by varying both the footprint and the density of the pits. In the latter case, an increased pit density has the effect that the dam portions occupy a larger fraction of the total surface of the roller, so that the ink carrying capacity is reduced.
  • the thickness of the dam portions may be relatively small and is determined by the pit array with the largest ink carrying capacity (and the narrowest dams). As a result, the uniformity of the ink layers is improved, especially for pit arrays with small ink carrying capacity. This permits an improved accuracy and reproducibility in the colour measurements to be performed on the ink films, so that the colour impression can be predicted more reliably.
  • the pit array of the inking roller that is used for colour proofing does not have to be identical with the pit array of the anilox roller that is actually used for printing. All that is required is that the thickness of the ink layer formed in the actual print process, which ink layer is influenced not only by the screen of the anilox roller but also by the material of the anilox roller, the ink transfer properties of the printing plates, and the like, is equal to the thickness of the ink layer on the proof formed with the inking roller.
  • a colour proofing apparatus 10 comprises an engraved inking roller 12, a back pressure cylinder 14, and a conveyor 16 arranged to feed a sheet 18 of a print substrate through a nip formed between the inking roller 12 and the back pressure cylinder 14.
  • An ink fountain 20 is disposed at the periphery of the inking roller 12 for inking the surface of the roller.
  • a metered amount of ink may be filled into the ink fountain 20 with a pipette 22.
  • the ink fountain 20 further includes a probe 24 for measuring the temperature and/or the viscosity of the ink contained therein.
  • the surface of the inking roller 12 is formed with at least one array of pits which will be filled with ink when they pass through the ink fountain 20.
  • the peripheral surface of the inking roller 12 carries a plurality of screens or pit arrays 26.
  • the pit arrays 26 extend in axial direction of the inking roller and are equally distributed in circumferential direction.
  • the volume of the pits, and hence the ink carrying capacity of the screens (volume of ink per surface area) differs from array to array.
  • each pit array 26 will print an ink layer 28 onto the print substrate, as has been shown in Fig. 2 .
  • the colours of these ink layers (numbered as 1-7 in Fig. 2 ) will differ from one another due to the different ink carrying capacities of the pit arrays 26.
  • a colour sensitive optical sensor 30, e.g. a spectrometer, is mounted in a stationary position above the conveyor 16 so as to successively measure the colour of each ink layer 28 as the sheet 18 passes through.
  • the colours measured by the sensor 30 will be represented by colour values in a suitable colour space such as CIE XYZ or CIE L*a*b*.
  • the senor 30 is combined with an illumination system 32 for illuminating the sheet on the conveyor 16.
  • Another light source 34 is mounted below the conveying path of the sheet, so that transparent or translucent sheets may also be illuminated from below. Since the entire colour proofing apparatus 10 is accommodated in a closed casing 36 and the sensor 30 and the light sources 32, 34 are mounted in fixed positions in this casing, it is assured that the ink layers 28 on the sheets 18 will always be measured under the same illumination conditions.
  • the conveyor 16 has two endless conveyor belts 38 passed around guide rollers 40 and a tensioning roller 42 and spaced apart from one another in axial direction of the inking roller 12.
  • a stationary part 44 of a lower cutting die ( Fig. 2 ) is mounted in the space between the conveyor belts 38 on an upstream side of the conveyor.
  • the lower cutting die is supplemented by two movable parts 46 each of which is fixed on or integrated in one of the conveyor belts 38. Together, the parts 44 and 46 form a rectangular cutting die for cutting out the rectangular sheet 18 from a larger blank.
  • a corresponding upper cutting die 48 ( Fig. 1 ) is pivotally mounted above the conveyor 16.
  • the cutting mechanism formed by the lower and upper cutting dies can be accessed by an operator by opening a lid 50 in the top wall of the casing 36.
  • a blank of a print substrate may be placed on the conveyor belts 38 and the lower cutting die, and a rectangular sheet 18 may be punched out by temporarily closing the upper cutting die 48.
  • the upper cutting die is lifted again and the remaining outer portion of the blank is removed while the cut sheet 18 remains on the parts 44, 46 of the lower cutting die.
  • the movable parts 46 of the lower cutting die are configured as sheet holders for holding the marginal areas on both sides of the sheet 18.
  • each part 46 of the lower cutting die may be formed with a suction blower and suction nozzles (not shown) for attracting the marginal areas of the sheet 18 and thereby fixing the sheet on the conveyor belts 38.
  • Endless guide belts 52 are disposed above the conveyor belts 38 at each end of the inking roller 12. A lower stretch of each of these guide belts 52 extends horizontally immediately above the conveyor belt 38, so that, when the sheet 18 is fed through, the marginal areas of the sheet are safely held on the conveyor belts by the guide belts 52. This will prevent the sheet from sticking to the inked peripheral surface of the inking roller 12.
  • a drive motor 54 and a drive gear (shown only schematically in Fig. 1 ) are provided for driving the inking roller 12 and the guide belts 52 in synchronism.
  • Another drive motor 56 is provided for the conveyor 16. The speeds of the drive motors 54 and 56 are synchronized electronically, so that the speed with which the sheet 18 is conveyed on the conveyor belts 38 exactly equal to the peripheral speed of the inking roller 12.
  • the back pressure cylinder 14 is also driven by the drive motor 54, and the associated drive train includes a one-way clutch 58 permitting the back pressure cylinder to rotate at a speed that is higher than the speed imposed by the drive motor 54.
  • the axis of the back pressure cylinder 14 is supported in a set mechanism 60 that is mounted on a carriage 62 and adapted to lift and lower the back pressure cylinder 14 relative to the inking roller 12.
  • the set mechanism 60 may comprise pneumatic cylinders, eccentrics and the like arranged to lift the back pressure 14 into contact with the inking roller 12 and the sheet 18 that is passing through and to bias the back pressure cylinder against the inking roller 12 with a pre-defined force.
  • the back pressure cylinder 14 may have a rubber-elastic surface layer.
  • the body of the back pressure cylinder 14 is preferably formed by a fibre-reinforced carbon, so that the back pressure cylinder 14 has a low weight and a low moment of inertia.
  • the carriage 62 is movable back and forth in horizontal direction in parallel with the transport direction of the sheet 18, and carries also a cleaning device 64 for the inking roller 12.
  • the cleaning device 64 may be moved into the position of the back pressure cylinder 14 and into engagement with the lower vertex of the inking roller 12, so that an automatic cleaning process for cleaning the inking roller may be performed.
  • the top wall of the casing 36 has another lid 66 or connector giving access to the pipette 22, and yet another lid 68 gives access to the sensor 30, so that the sensor may optionally be replaced by another type of optical sensor, e.g. a colour sensor that will also be used in the flexographic printing press, so that the measurement results may directly be compared to one another.
  • another type of optical sensor e.g. a colour sensor that will also be used in the flexographic printing press, so that the measurement results may directly be compared to one another.
  • a compressor 70 or any other source of compressed air and a vent valve 72 are connected to the casing 36, so that the interior of the casing may be set under pressure and vented.
  • a colour proofing cycle may be performed as will be described below.
  • the proofing process aims at predicting the colour of a print product that is obtained with a flexographic printing press that has schematically been shown in Fig. 3 .
  • the printing press comprises a central impression cylinder 74 and a number of colour decks arranged at the periphery of the central impression cylinder. Only one of the colour decks has been shown in Fig. 3 .
  • This colour deck comprises a printing cylinder 76, an anilox roller 78 and a chambered doctor blade 80.
  • a web of a print substrate 82 is passed around the central impression cylinder 74 so as to pass through the nip formed with the printing cylinder 76.
  • the anilox roller 78 has a pattern of minute ink-receiving pits.
  • the pits of the anilox roller 78 are filled with ink from the chambered doctor blade 80.
  • the anilox roller 78 is set against the peripheral surface of the printing cylinder 76 and rotated, so that the ink is transferred onto the printing cylinder 76.
  • the printing cylinder 76 is rotated and pressed against the print substrate 82, so that the elevated printing parts of printing plates mounted on the printing cylinder 76 transfer the ink onto the print substrate 82, and an image is printed.
  • the colour proofing apparatus 10 is used for predicting the colour of that printed image.
  • the screen of the anilox roller 78 corresponds to one of the pit arrays 26 of the inking roller 12 in the proofing apparatus in the sense that, given the ink transfer properties of the anilox roller 78 and the printing cylinder 76, the screen of the anilox roller 78 results in an ink layer on the substrate 82 which has the same thickness as the ink layer formed on the sheet 18 by means of the pit array 26.
  • the vent valve 72 is opened, so that any possible elevated pressure in the casing 36 is relieved.
  • An operator opens the lid 50 and places a blank of a web material that is identical with the material of the print substrate 82 onto the conveyor 16 and, more particularly, onto the fixed and movable parts 44, 46 of the lower cutting die.
  • the upper cutting die 48 is pivoted onto the lower cutting die and pressed downward, so that the sheet 18 is cut out of the blank.
  • the upper cutting die 48 is opened again, the remaining parts of the blank are removed, and the lid 50 is closed again.
  • the suction blowers (not shown) in the moving parts 46 of the lower cutting die are activated to suck the marginal areas of the cut sheet 18 and to hold the sheet on the movable parts 46 and hence on the conveyor belts 38.
  • the drive motors 54 and 56 are started to drive the conveyor 16 and the guide belts 52 as well as the inking roller 12.
  • the conveyor belts 38 with the moving cutting die parts 46 fixed thereon move the sheet 18 towards the inking roller 12.
  • the back pressure cylinder 14 is still held in a lowered position in which it is not in contact with the inking roller nor with the sheet 18.
  • the pit arrays 26 on the inking roller 12 take up ink from the ink fountain 20 and, as the inking roller rotates, this ink is conveyed along the periphery of the inking roller. Note that, in this phase, evaporation of ink is suppressed by the increased air pressure.
  • the temperature and viscosity of the ink are measured with the probe 24 and recorded in the control unit.
  • the set mechanism 60 When the leading edge of the sheet 18 has passed through between the inking roller 12 and the back pressure cylinder 14, the set mechanism 60 is activated to lift the back pressure cylinder 14 and bias the same with the pre-defined line pressure against the web 18.
  • the drive motor 54 drives the back pressure cylinder 14 with a circumferential speed that is slightly lower than that of the inking roller 12.
  • the one-way clutch 58 permits the back pressure cylinder to accelerate until the circumferential speed is exactly identical with that of the inking roller 12, so that no slippage will occur between the rollers and the sheet, regardless of the amount of compression of the rubber-elastic layer of the back pressure cylinder. Thanks to the low moment of inertia of the back pressure cylinder 14, this speed adjustment is achieved within a very short time.
  • the pit arrays 26 which have been inked in the ink fountain 20 will successively reach the nip between the inking roller 12 and the back pressure cylinder 14, and the ink will be transferred onto the sheet 18 to form the ink layers 28 in a well reproducible manner.
  • the back pressure cylinder 14 is lowered again and brought out of contact with the sheet and the inking roller 12, so that the back pressure cylinder is prevented from becoming soiled with ink.
  • the guide belts 52 force the sheet 18 to stay on the conveyor belts 38 and prevent the sheet from sticking to the peripheral surface of the inking roller 12.
  • the vent valve 72 is opened so as to relieve the elevated pressure in the casing 36.
  • the sheet 18 reaches the position of the sensor 30 and, while the illumination system is activated, the colours of the ink layers 28 are measured and recorded as the sheet passes through below the stationary sensor 30.
  • the measured colour values are transmitted to the control unit for further processing.
  • the transport direction of the conveyor 16 is reversed, so that the movable parts 46 of the lower cutting line, with the sheet 18 still held thereon, are returned to the position shown in Fig. 1 .
  • the carriage 62 is moved rightwards in Fig. 1 , so that the cleaning unit 64 is brought into its operative position, and the peripheral surface of the inking roller 12 is cleaned.
  • the conveyor belts 38 pass outside of the axial ends of the inking roller 12 as is shown in Fig. 2 , so that they will not become stained with ink.
  • the lid 50 may be opened and the sheet 18 may be taken out, and a new proofing cycle may begin.
  • the sheet 18 with the ink layers 28 formed on the top side (which will be the reverse side in the actual print process) may be taken out and reversed manually for measuring the colours of the ink layers with the sensor 30 through the transparent sheet.
  • Fig. 2 shows an embodiment where the pit arrays 26 formed on the surface of the inking roller 12 are configured as stripes that extend in axial direction of the roller
  • Fig. 4 illustrates an example of an inking roller 12' where the pit arrays 26 are configured as bands that extend in circumferential direction of the roller.
  • Fig. 5 (A) and (B) illustrate two inking rollers 82, 84 that form part of a set of several inking rollers. Each of these inking rollers has only a single pit array 26 that occupies the entire peripheral surface of the roller.
  • the inking rollers 82, 84 may be hand-held rollers or may be configured to successively replace the inking roller 12 shown in Fig. 2 . In the latter case, proofs with different ink layer thicknesses can be formed in a plurality of operating cycles of the colour proofing apparatus.
  • Fig. 6 (A) shows an enlarged plan view of a pit array 26 formed by square pits 86 that are separated from one another by dam portions 88.
  • Fig. 6 (B) shows, on the same scale as Fig. 6 (A) , a plan view of another pit array 26 in which the square pits 86 have a smaller size. However, the width "d" of the dam portions 88 is the same for both pit arrays in Fig. 6 (A) and (B) .
  • the dam portions separating the individual pits from one another have the same width for all pit arrays 26.
  • Fig. 6 (C) and (D) show cross-sectional views of the pit arrays 26 shown in Fig. 6 (A) and Fig. 6 (B) , respectively. It can be seen here that the pits 86 of both pit arrays have the same depth. Nevertheless, the total pit volume per unit area is smaller for the pit array shown in Fig. 6 (D) , because the dam portions 88 occupy a larger fraction of the surface of the roller. Consequently, the ink layer formed with the pit array shown in Fig. 6 (B) and (D) will be smaller than the thickness of the ink layer formed with the pit array shown in Figs. 6 (A) and (C) .
  • Figs. 7 (A) and (B) show cross-sectional views of two pit arrays 26 of an inking roller or inking roller set according to a modified embodiment.
  • the pits 86 of both pit arrays have the same footprint but a different depth.
  • the width of the dam portions 88 is the same for both pit arrays.
  • the total pit volume per unit area is smaller in Fig. 7 (B) because the volume of the individual pits 86 is smaller while the number of pits per unit area is the same as in Fig. 7 (A) .
  • Inking rollers with pit arrays of the type described above may be formed for example by engraving the pits into the surface of the inking roller with a laser.
  • the shape of the footprint of the pits 86 does not have to be a square but may for example also be a rectangle on a regular hexagon.
  • the pits of each pit array 26 are arranged in a regular raster. In any case, the density of the pits should be correlated with the size of the footprints of the pits such that the dam portions 88 have the same width "d" for all pit arrays 26 that belong to the same inking roller or inking roller set.
  • the width "d" of the dam portions 88 is selected as small as possible, so that it is just sufficient to reliably separate the individual pits 86 from one another.
  • this pit array 26 is used to form an ink layer on the substrate, the ink will be evenly distributed over the surface of the substrate, so that the ink layer will have a uniform thickness.
  • the uniformity of the ink layer will be just as good because the dam portions 88 have the same width, and only the layer thickness will be smaller because of the reduced pit volume.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Methods (AREA)

Claims (4)

  1. Verfahren zum Farbproofing, bei dem eine Färbewalze (12; 12') in einem Farbproofgerät zum Farbproofing durch Erzeugen von Farbschichten unterschiedlicher Dicke verwendet wird, wobei die Färbewalze auf ihrer Umfangsfläche mehrere Näpfchenfelder (26) aufweist, die durch Näpfchen (86) gebildet werden, die durch Dämme (88) voneinander getrennt sind, wobei diese Näpfchenfelder (26) sich im Gesamtvolumen der Näpfchen pro Flächeninhalt voneinander unterscheiden, wobei die Dämme (88) der verschiedenen Näpfchenfelder (26) die gleiche Breite (d) haben.
  2. Verfahren nach Anspruch 1, bei dem die Näpfchenfelder (26) als Streifen ausgebildet sind, die sich in Axialrichtung der Färbewalze erstrecken.
  3. Verfahren nach Anspruch 1, bei dem die Näpfchenfelder (26) als Bänder ausgebildet sind, die sich in Umfangsrichtung der Walze erstrecken.
  4. Verfahren zum Farbproofing, bei dem ein Färbewalzensatz in einem Farbproofgerät zum Farbproofing durch Erzeugen von Farbschichten unterschiedlicher Dicke verwendet wird, wobei der Färbewalzensatz eine Vielzahl von Färbewalzen (82, 24) aufweist, von denen jede auf ihrer Umfangsfläche ein Näpfchenfeld (26) aufweist, das durch Näpfchen (86) gebildet wird, die durch Dämme (88) voneinander getrennt sind, wobei die Näpfchenfelder (26) sich im Gesamtvolumen der Näpfen pro Flächeneinheit voneinander unterscheiden, wobei die Dämme (88) der verschiedenen Näpfchenfelder die gleiche Breite haben.
EP20110185341 2011-10-14 2011-10-14 Farbwalze und Farbwalzensatz für Farbproofing Active EP2581227B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES11185341T ES2453917T3 (es) 2011-10-14 2011-10-14 Rodillo entintador y conjunto de rodillos entintadores para pruebas de color
EP20110185341 EP2581227B1 (de) 2011-10-14 2011-10-14 Farbwalze und Farbwalzensatz für Farbproofing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20110185341 EP2581227B1 (de) 2011-10-14 2011-10-14 Farbwalze und Farbwalzensatz für Farbproofing

Publications (2)

Publication Number Publication Date
EP2581227A1 EP2581227A1 (de) 2013-04-17
EP2581227B1 true EP2581227B1 (de) 2014-03-19

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EP20110185341 Active EP2581227B1 (de) 2011-10-14 2011-10-14 Farbwalze und Farbwalzensatz für Farbproofing

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6764576B2 (ja) * 2018-08-21 2020-10-07 住友ゴム工業株式会社 フレキソ印刷版とそれを用いた液晶表示素子の製造方法
US20210070032A1 (en) 2019-09-05 2021-03-11 Harper Corporation Of America Engraved roller for flexographic and gravure printing

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3938449A1 (de) * 1989-11-18 1991-05-23 Roland Man Druckmasch Druckwerk
DE19901243A1 (de) * 1999-01-14 2000-07-20 Heidelberger Druckmasch Ag Dosierbare Rasterwalze in einer Rotationsdruckmaschine
DE102006031682A1 (de) * 2006-07-08 2008-01-10 Man Roland Druckmaschinen Ag Flexodruckrasterwalze und Flexodruckverfahren
DE102007044757A1 (de) * 2006-10-13 2008-04-17 Heidelberger Druckmaschinen Ag Rasterwalze für ein Anilox-Druckwerk einer Druckmaschine

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ES2453917T3 (es) 2014-04-08
EP2581227A1 (de) 2013-04-17

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