EP1568490B1 - Procédé de gravure directe des cellules pour recevoir l'encre en rotogravure - Google Patents

Procédé de gravure directe des cellules pour recevoir l'encre en rotogravure Download PDF

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Publication number
EP1568490B1
EP1568490B1 EP04004470A EP04004470A EP1568490B1 EP 1568490 B1 EP1568490 B1 EP 1568490B1 EP 04004470 A EP04004470 A EP 04004470A EP 04004470 A EP04004470 A EP 04004470A EP 1568490 B1 EP1568490 B1 EP 1568490B1
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EP
European Patent Office
Prior art keywords
engraving
printing
depth
pixels
engraved
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.)
Expired - Lifetime
Application number
EP04004470A
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German (de)
English (en)
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EP1568490A1 (fr
Inventor
Siegfried Dr. Beisswenger
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.)
Hell Gravure Systems GmbH and Co KG
Original Assignee
Hell Gravure Systems GmbH and Co KG
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
Priority to AT04004470T priority Critical patent/ATE369977T1/de
Application filed by Hell Gravure Systems GmbH and Co KG filed Critical Hell Gravure Systems GmbH and Co KG
Priority to ES04004470T priority patent/ES2293109T3/es
Priority to EP04004470A priority patent/EP1568490B1/fr
Priority to DE502004004634T priority patent/DE502004004634D1/de
Priority to JP2004105735A priority patent/JP2005238812A/ja
Priority to CNB2004100350904A priority patent/CN100421932C/zh
Priority to US10/895,555 priority patent/US20050188868A1/en
Publication of EP1568490A1 publication Critical patent/EP1568490A1/fr
Application granted granted Critical
Publication of EP1568490B1 publication Critical patent/EP1568490B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B41C1/02—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

Definitions

  • the invention relates to a method for direct engraving of cups for receiving printing inks in the surface of gravure printing cylinders according to the preamble of claim 1.
  • the US-A-4 013 831 a method of producing printing forms by mechanical engraving, in which individual cups are engraved with a diamond stylus in the printing plate surface, wherein the diamond stylus is driven directly with the halftone data of the respective devisziehravierenden well to dig this deeper or less deep from the printing plate.
  • the size of the wells is directly related to the depth of the wells, since it is not possible with a diamond stylus to simultaneously engrave flat and large and small and deep wells.
  • a variant of the implementation of the information of the image to be printed on the printing cylinder in gravure printing is the so-called.
  • Laser mask exposure of a previously applied to the printing cylinder thin thermal or photosensitive mask layer followed by etching.
  • the mask is removed by means of a fine laser beam or it is exposed at the locations where one or no wells are to be etched.
  • the cleaning in the case of a thermal mask or the development and washing out in the case of a photosensitive mask is carried out on the mask surface and then the etching of the exposed elements of the copper surface then takes place.
  • the wells in the mask layer can also be applied only surface variable, i. they can vary only in the number and arrangement of the surface elements composing them. This means that a different depth variation of the individual wells is not possible because all wells are etched the same depth over the etching process.
  • a method for the production of deep and variable area gravure forms is known in which an applied to the printing plate etch resist or Kopierlack protective layer with a high energy beam, for example a laser beam or an electron beam, is wholly or partially removed over the wells to be engraved, and in which the shape of the etched after the removal of the ⁇ tzresist- or Kopierlack protective layer from the printing plate wells is controlled by over leaving at least a punctiform etch resist or copy resist protective layer member on a portion of the wells, thereby reducing the depth of etch beneath the protective layer member.
  • a high energy beam for example a laser beam or an electron beam
  • a "halftone image" (half tone image) must be generated in which the desired gray value is converted into a bit structure for the respective screen or printing mesh ( Bitmap) is implemented.
  • RIP raster image processor
  • the "rippling" as I said is not necessary because this produces the well in one go, and directly with gray values (continuous tone data, English “continuous tone data”) can be controlled.
  • the gravure based on the laser mask coating also has certain disadvantages, because in the mask, as mentioned, can be written only surface variable and the third dimension, i. the cup depth, is the same for all cup sizes and is formed by the same process, namely the etching. It has been found that this method also leads to quality limitations in the printed reproduction of the image. In addition, the repeatability of the etching is subject to restrictions and it is shown in the reproduction of halftone gradients that in particular in the range of high brightness (light) no smooth Tonwertverlauf is achieved.
  • the subsequent etching are eliminated, with a much better reproduction of halftone gradients, especially in the field of lights, is further improved, which does not limit the repeatability of the process and eliminates the many process steps required in the laser mask coating and the subsequent etching of the printing form, and otherwise preserves all the advantages of the conventional engraving process for forming the wells on the printing cylinders and that the method by means of per se in the prior art known engraving devices can be performed for these purposes.
  • the object is achieved according to the invention in that the engraving process is carried out such that at least a portion of the wells comprises a plurality of engraved pixels.
  • a fine engraving tool is guided over the entire surface of the printing form to be engraved in a regular pattern such that the cells can be formed from the predetermined number of pixels by engraving the pixels.
  • This writing grid is finer than the selected gravure grid containing the volume-variable gravure wells.
  • the gravure printing heads are engraved directly into the engraving-carrying surface of the printing cylinder.
  • the complex process steps according to the method after the laser mask exposure and the subsequent etching and cleaning are completely eliminated in the inventive method, wherein according to the invention excellent sharpness of the image to be printed with respect to the actual image and all contours is achieved.
  • the method can in principle be carried out by means of existing engraving systems for engraving printing cylinders for intaglio printing, so that the method can also be used with existing engraving devices already in use.
  • the engraving depth of the pixels is differently formable, that is, the pixel volumes and thus the cell volumes can be varied by different selected engraving depth of the individual pixels.
  • the engraving depth of the pixels may preferably be formed differently for the same extent of the surface element of the pixel, that is, according to the invention, the engraving depth of the pixel is no longer correlated with the two-dimensional extent of the surface element of the pixel. It follows that the data that drive the engraving tool used in the method according to the invention, not as in the laser mask exposure, in a so-called. "Bitmap" are encoded. Rather, it is possible according to the invention that each individual pixel should be engraved deeply in a predetermined manner.
  • the engraving depth can preferably be determined in stepped depth steps, but it is also possible in principle for the engraving depth to be defined or controlled by analogous control of the engraving tool.
  • the depth steps are resolved with either 1 to 8 bits, preferably 8 bits, so that a maximum of 255 different depths can be engraved. But it is also possible to encode the depth resolution with only 2 bits, so that, for example, four depth positions possible are like full depth, medium depth, small depth and no engraving. But there are other depth patterns than 2 bit possible.
  • the engraving width per grid mesh can also be built up step by step.
  • a well may consist of at least one pixel and to consist of a maximum of 255 pixels, that is, the pattern of pixels forming the well may increase from 1 to 255 pixels.
  • the two-dimensional surface element of the pixel is preferably variably adjustable with respect to its areal extent, the areal extent advantageously being in the range of 10 to 20 ⁇ m.
  • the size of the areal extent of the area element of the pixel i.e., the size of the area of the pixel on the surface of the printing form to be engraved, can be chosen depending on the engraving medium used for the engraving process.
  • the invention advantageously makes it possible for the engraving process to be carried out in such a way that partial cells can be formed from a predetermined number of pixels, so that in particular contours of text and images can be reproduced extremely sharply in the subsequent printing.
  • the formation of Sectionnäpfchen was previously possible only in the method according to the method of laser mask exposure in limited form or in offset printing with all the usual in these known printing method prevailing disadvantages.
  • the laser light can have any suitable cross-sectional shape per se by means of suitable lens systems and suitable diaphragm systems, so that the pixels can be suitably formed in accordance with the cross-sectional shape of the laser beam.
  • Fig. 1 In which the principle of the formation of wells in a printing cylinder using a known in the art, conventional engraving is shown. From the entire printing cylinder, for example, a small area is selected, which consists of 4 different sized wells.
  • the actual engraving agent is normally a diamond shaped like an engraving stylus.
  • This known engraving method for printing cylinders used in gravure printing is generally referred to as electromagnetic engraving and has long been known in the art, so that need not be further discussed here on the description of the control of the engraving to form the wells.
  • a specific feature of the wells produced by the electromagnetic engraving is that due to the depth of the solid geometry of the engraving stylus and the diameter, ie the extent 14, in Fig. 1 by way of example with respect to the diagonal of a cup 10, to the engraving depth 12 in a certain fixed ratio.
  • the printing form obtained by electromagnetic engraving is called semi-autotypic intaglio printing, since the cups 10 are variable in their extent 14 and in their engraving depth 12, but always in a fixed relationship to each other, the only by differently shaped engraving tools, eg. By a Different cut a diamond stylus, can be changed, but is always fixed during the actual engraving process.
  • Another specific feature of the electromechanical engraving is also that due to the thin liquid ink used in gravure full-tone contours (text and line contents) are reproduced in principle the same print grid of wells as the images (image contents), in the selected for each color print grid , As a result, a certain blurring of contours (text and line content) is achieved in gravure printing.
  • FIG. 3 shows, by way of example, a surface-variable halftone dot 20 which is formed by means of the laser mask exposure method and is formed from a plurality of pixels, said dots forming in their entirety the said cup 10. Since the laser light writing beam 19 can only say "yes” or “no” in this known method, that is, can remove or leave the mask previously applied to the printing cylinder, the thus formed well can only be applied variable in area. The engraving depth 12 is generated in common for all cups 10 together via the etching process.
  • a in a grid 17 inventively designed cup 10 is shown schematically in Fig. 4.
  • the method is carried out such that by means of the engraving process, the wells 10 by a suitable engraving, which may be an electromechanical engraving but also laser light, were formed from a predetermined number of pixels 11, ie, the actual well 10 is active in the engraving of a predetermined number of pixels 11, also called pixels.
  • a suitable engraving which may be an electromechanical engraving but also laser light
  • each cup 10 depending on the predetermined tonal values of the image to be printed, can be composed of any number of pixels 11, wherein a cup 10 consists of at least one pixel 11 and a maximum of the number of pixels 11, which are desired due to the program-related screening, for example, 255 pixels.
  • a raster mesh is resolved in 255 steps corresponding to 1 byte in gravure printing, so that the formation of the wells 10 by 255 different patterns of pixels 11 represents a meaningful number or relationship.
  • the engraving depths 12 of the centrally located pixels 11, which appear darkest, are the deepest, the pixels 11 surrounding the central region 11 are, on the other hand, less deeply formed, and the outer, surrounding pixels are formed to an even smaller depth ,
  • a predetermined fixed depth raster for example, represented by 2 bits.
  • full depth, average depth, shallow depth, and no engraving could follow bit code 11, 10, 01, and 00.
  • bit code 11 10, 01, and 00.
  • 255 pixels 11 and an engraving depth 12 (see Fig. 1) dissolved in 2 bits correspond to more than 1000 achievable values with which a well 10 can be formed according to the method.
  • this high number of more than 1000 adjustable values of the pixels 11 per well 10 represents an over-determination, but this is canceled out in printing practice because certain pixels 11 of the pixel pattern are taken back in their engraving depth 12 from an engraving and printing point of view so that a smooth expression of gradients is possible.
  • This reduction of the geometric depth in certain areas is developed experimentally or empirically and stored in a so-called "folder for cup configurations".
  • FIGS. 5a and 5b are formed in such a way that, by means of the method according to the invention, it is also possible to form partial cells 15 from a predetermined number of pixels 11. This ensures that contours 18 can be reproduced as sharply as it was previously possible only in offset printing, but with all the advantages of gravure over offset printing.
  • the extension 14 of the surface element 13 of the pixel 11, cf. 1, which represents the formation of wells 10 by means of conventional electromechanical engraving, can also be variably adjustable and can be made dependent on the actual engraving means, which can advantageously, but not necessarily, be laser light 16 (FIG. 3). If the engraving medium is used in the form of laser light 16, it is in principle possible, suitably controlled, to vary the extent 14 of the surface element 13 of the pixel 11 even during the engraving process by suitable control of the laser, whereby an engraving with yet another, controllable or influenceable degree of freedom is possible.
  • the printing density represented by a screen mesh of the engraving screen wherein the screen has, for example, a resolution of 70 lines / cm, interpolated from a halftone image with a higher resolution, eg 120 lines / cm, so that additional information is present, namely how the density is distributed approximately within a Gravurrastermasche.
  • This information can be used for targeted relocation of the entire Pattern of the pixels 11, so the composite of these cells 10, are used.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Methods (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (12)

  1. Procédé de gravure directe d'alvéoles (10) destinés à recevoir de l'encre d'imprimerie à la surface de cylindres d'impression destinés à l'héliogravure, le processus de gravure étant exécuté de manière à ce que les alvéoles (10) soient formés d'un nombre prédéfini de points d'image (11) gravés,
    caractérisé en ce qu'
    au moins une partie des alvéoles (10) comporte une multitude de points d'image (11) gravés individuellement.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la profondeur de gravure (12) des points d'image (11) peut être différente.
  3. Procédé selon la revendication 2,
    caractérisé en ce que
    la profondeur de gravure (12) des points d'image (11) peut être différente pour une même étendue (14) de l'élément de surface (15) du point d'image (13).
  4. Procédé selon l'une quelconque ou les deux revendications 2 ou 3,
    caractérisé en ce que
    la profondeur de gravure (12) est fixée en étapes de profondeur étagées.
  5. Procédé selon la revendication 4,
    caractérisé en ce que
    les étapes de profondeur peuvent se situer dans une configuration binaire, à la convenance, de 1 à 8 bits.
  6. Procédé selon la revendication 5,
    caractérisé en ce que
    la configuration binaire est égale à 2 bits.
  7. Procédé selon l'une ou plusieurs des revendications 1 à 6,
    caractérisé en ce qu'
    une alvéole (10) est constituée au maximum de 255 points d'image (11).
  8. Procédé selon l'une ou plusieurs des revendications 1 à 7,
    caractérisé en ce qu'
    on peut faire varier l'élément de surface (13) du point d'image (11) par rapport à son étendue plane (14).
  9. Procédé selon la revendication 8,
    caractérisé en ce que
    l'étendue plane (14) est de l'ordre de 10 à 20 µm.
  10. Procédé selon l'une ou plusieurs des revendications 1 à 9,
    caractérisé en ce que
    le processus de gravure est exécuté de manière à ce que des alvéoles partielles (15) soient formées d'un nombre prédéfini de points d'image (11).
  11. Procédé selon l'une ou plusieurs des revendications 1 à 10,
    caractérisé en ce que
    la gravure des points d'image (11) est exécutée par un moyen de gravure électromécanique.
  12. Procédé selon l'une ou plusieurs des revendications 1 à 10,
    caractérisé en ce que
    la gravure des points d'image (11) est exécutée par lumière laser (16).
EP04004470A 2004-02-27 2004-02-27 Procédé de gravure directe des cellules pour recevoir l'encre en rotogravure Expired - Lifetime EP1568490B1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
ES04004470T ES2293109T3 (es) 2004-02-27 2004-02-27 Procedimiento para el grabado de alveolos para la recepcion de tintas de imprenta para impresion de huecograbado.
EP04004470A EP1568490B1 (fr) 2004-02-27 2004-02-27 Procédé de gravure directe des cellules pour recevoir l'encre en rotogravure
DE502004004634T DE502004004634D1 (de) 2004-02-27 2004-02-27 Verfahren zur direkten Gravur von Näpfchen zur Aufnahme von Druckfarbe für den Tiefdruck
AT04004470T ATE369977T1 (de) 2004-02-27 2004-02-27 Verfahren zur direkten gravur von näpfchen zur aufnahme von druckfarbe für den tiefdruck
JP2004105735A JP2005238812A (ja) 2004-02-27 2004-03-31 印刷インクを溜めるためにグラビア印刷用に限定された圧胴の表面に直接セルを彫刻する方法
CNB2004100350904A CN100421932C (zh) 2004-02-27 2004-04-23 直接雕刻容纳凹版印刷油墨的小凹槽的方法
US10/895,555 US20050188868A1 (en) 2004-02-27 2004-07-21 Method for direct engraving of cups to accept the printing ink for rotogravure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04004470A EP1568490B1 (fr) 2004-02-27 2004-02-27 Procédé de gravure directe des cellules pour recevoir l'encre en rotogravure

Publications (2)

Publication Number Publication Date
EP1568490A1 EP1568490A1 (fr) 2005-08-31
EP1568490B1 true EP1568490B1 (fr) 2007-08-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04004470A Expired - Lifetime EP1568490B1 (fr) 2004-02-27 2004-02-27 Procédé de gravure directe des cellules pour recevoir l'encre en rotogravure

Country Status (7)

Country Link
US (1) US20050188868A1 (fr)
EP (1) EP1568490B1 (fr)
JP (1) JP2005238812A (fr)
CN (1) CN100421932C (fr)
AT (1) ATE369977T1 (fr)
DE (1) DE502004004634D1 (fr)
ES (1) ES2293109T3 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
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DE102008035203A1 (de) * 2008-07-28 2010-02-11 Leibniz-Institut für Oberflächenmodifizierung e.V. Verfahren zur Herstellung einer rotativen Druckform zum Einsatz in einem Rollenrotationsdruckverfahren
WO2012119704A1 (fr) 2011-03-09 2012-09-13 Hell Gravure Systems Gmbh & Co. Kg Procédé et dispositif d'usinage d'un cylindre, en particulier d'un cylindre d'impression ou d'estampage
WO2012139721A1 (fr) 2011-04-14 2012-10-18 Hell Gravure Systems Gmbh & Co. Kg Procédé pour usiner une pièce à l'aide d'un faisceau laser
CN111016474A (zh) * 2019-12-08 2020-04-17 南京林业大学 实地凹版方形网穴结构的油墨用量预测方法
CN111016475A (zh) * 2019-12-08 2020-04-17 南京林业大学 实地凹版六边形网穴结构的油墨用量预测方法
CN111016476A (zh) * 2019-12-08 2020-04-17 南京林业大学 实地凹版抱枕形网穴结构的油墨用量预测方法
CN111098616A (zh) * 2019-12-08 2020-05-05 南京林业大学 实地凹版菱形网穴结构的油墨用量预测方法

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DE19840926B4 (de) * 1998-09-08 2013-07-11 Hell Gravure Systems Gmbh & Co. Kg Anordnung zur Materialbearbeitung mittels Laserstrahlen und deren Verwendung
ATE404378T1 (de) * 2005-05-03 2008-08-15 Merck Patent Gmbh Verwendung von lasergravierten druckformen
ATE555902T1 (de) * 2007-06-20 2012-05-15 Hell Gravure Systems Gmbh & Co Kg Verfahren und vorrichtung zur bebilderung einer tiefdruckform
DE102007029099A1 (de) * 2007-06-21 2008-12-24 Hell Gravure Systems Gmbh & Co. Kg Verfahren und Vorrichtung zur Bebilderung einer Tiefdruckform und so bebilderte Tiefdruckform
EP2305464A1 (fr) * 2009-09-30 2011-04-06 Ernst-Rudolf Dr. Weidlich Procédé de gravure d'une surface, une surface d'un moule d'impression pour l'impression en profondeur et une surface réalisée selon ce procédé
CL2010000884A1 (es) 2010-08-19 2011-02-18 Andres Bienzobas Saffie Fernando Metodo de impresion en dos dimensiones en un soporte de impresion en tres dimensiones, que comprende proveer un soporte de impresion, rellenar unos medios de soporte del soporte de impresion con un medio colorante, esperar que el medio colorante se seque, y cortar transversalmente de manera paralela la cara de impresion en una pluralidad de lonjas; y un bloque de impresion.
CN104050845A (zh) * 2014-01-21 2014-09-17 刘卓韬 一种快速练写好汉字毛笔笔画教具及制造方法
CN104943339B (zh) * 2015-06-04 2018-01-12 上海希尔彩印制版有限公司 一种电子雕刻凹版上胶方法
KR102629696B1 (ko) * 2023-07-27 2024-01-29 대호기업 주식회사 그라비아 인쇄용 실린더 제조방법

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008035203A1 (de) * 2008-07-28 2010-02-11 Leibniz-Institut für Oberflächenmodifizierung e.V. Verfahren zur Herstellung einer rotativen Druckform zum Einsatz in einem Rollenrotationsdruckverfahren
DE102008035203B4 (de) * 2008-07-28 2011-01-27 Leibniz-Institut für Oberflächenmodifizierung e.V. Verfahren zum Löschen und Neubebildern eines Druckzylinders
WO2012119704A1 (fr) 2011-03-09 2012-09-13 Hell Gravure Systems Gmbh & Co. Kg Procédé et dispositif d'usinage d'un cylindre, en particulier d'un cylindre d'impression ou d'estampage
WO2012139721A1 (fr) 2011-04-14 2012-10-18 Hell Gravure Systems Gmbh & Co. Kg Procédé pour usiner une pièce à l'aide d'un faisceau laser
DE102011017080A1 (de) 2011-04-14 2012-10-18 Hell Gravure Systems Gmbh & Co. Kg Verfahren zur Bearbeitung eines Werkstücks mit Laserstrahl
DE102011017080B4 (de) * 2011-04-14 2016-02-18 Hell Gravure Systems Gmbh & Co. Kg Verfahren zur Bearbeitung eines Werkstücks mit Laserstrahl
CN111016474A (zh) * 2019-12-08 2020-04-17 南京林业大学 实地凹版方形网穴结构的油墨用量预测方法
CN111016475A (zh) * 2019-12-08 2020-04-17 南京林业大学 实地凹版六边形网穴结构的油墨用量预测方法
CN111016476A (zh) * 2019-12-08 2020-04-17 南京林业大学 实地凹版抱枕形网穴结构的油墨用量预测方法
CN111098616A (zh) * 2019-12-08 2020-05-05 南京林业大学 实地凹版菱形网穴结构的油墨用量预测方法
CN111016476B (zh) * 2019-12-08 2021-06-15 南京林业大学 实地凹版抱枕形网穴结构的油墨用量预测方法

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Publication number Publication date
DE502004004634D1 (de) 2007-09-27
ES2293109T3 (es) 2008-03-16
JP2005238812A (ja) 2005-09-08
CN100421932C (zh) 2008-10-01
CN1660585A (zh) 2005-08-31
ATE369977T1 (de) 2007-09-15
EP1568490A1 (fr) 2005-08-31
US20050188868A1 (en) 2005-09-01

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