EP2305464A1 - 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 - Google Patents

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 Download PDF

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Publication number
EP2305464A1
EP2305464A1 EP09012371A EP09012371A EP2305464A1 EP 2305464 A1 EP2305464 A1 EP 2305464A1 EP 09012371 A EP09012371 A EP 09012371A EP 09012371 A EP09012371 A EP 09012371A EP 2305464 A1 EP2305464 A1 EP 2305464A1
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EP
European Patent Office
Prior art keywords
engraving
printing
grid
raster
wells
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Withdrawn
Application number
EP09012371A
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German (de)
English (en)
Inventor
Ernst-Rudolf Dr. Weidlich
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP09012371A priority Critical patent/EP2305464A1/fr
Publication of EP2305464A1 publication Critical patent/EP2305464A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
    • B41C1/045—Mechanical engraving heads

Definitions

  • the invention relates to a method for engraving a surface of a printing form for gravure printing, wherein points to be formed on the surface are formed in predeterminable arrangement in raster form by the engraving in the form of wells, and wherein the engraving is carried out by means of an electromagnetically operable engraving stylus,
  • the imaging of printing forms i. the engraving of color picker and color blanker screen dots on the surface of printing forms used for gravure printing has long been recognized and is a standard technique used for decades to produce high quality printing results.
  • the gravure printing technology for the production of high-quality magazines, magazines, high-quality brochures but also used for printing on packaging or for printing catalogs. Rather, this illustrative enumeration is not exhaustive, but merely representative of the broad field of gravure application.
  • the imaging engraving as used for printing forms may be used for other purposes, e.g. the printing form need not be a printing cylinder and it is also possible to use the engraving by means of the known engraving process for gravure printing for flat media, for example.
  • Another significant drawback of the conventional imaging processes by means of an electromechanically operable engraving stylus is that there is a continuous fixed relationship between the depth of a well formed and the opening of the well in the surface, such that the depth of a well also determines the size of the surface opening and vice versa. This will ultimately require the use of a great deal of printing ink which would not be necessary per se, e.g. it is important to leave only color in the surface for printing again, but to the entire depth of the cup must be filled with color.
  • This task is gem. a first invention achieved in that at least a portion of the grid is executed inclined at an acute angle ⁇ relative to the rotational and / or linear movement direction of the printing plate in the generation of the screen dots and
  • the very great advantage of the solutions according to the invention consists essentially in that by means of the solution according to the invention, the technique of engraving by means of electromagnetically operable engraving stylus, which is extremely common and also due to their relatively simple process management and a relatively simple apparatus design of a device with which According to the invention, a moiré-free printing result can be achieved by means of the imaged printing forms or a correspondingly precise engraving result of the engraved medium, which has hitherto not been considered possible by means of engraving engraving.
  • a moiré effect does not occur, being parametrically rigid in its process control, i. not influenceable vibration engraving is left according to the invention, since this does not allow an angulation of the cell grid.
  • the process control it is possible with the process control to carry out a partial raster of the imaging of a printing forme or a medium at an acute angle ⁇ 1 and to form a different part of the raster at a different angle ⁇ 2 on the same printing form, ie in fact the angulation of each raster individually according to the type of template that effects the control of the illustration.
  • This measure also contributes to the moiré-free representation of the finished printed image.
  • the engraving stylus is actuated in the manner of a high-resolution engraving technique, i. the engraving stylus can thus much more easily controlled so form the cup, the cup is broken down into a predetermined amount of individual Partnäpfchen and engraved, which is in fact repealed the hitherto indissoluble relationship between cup opening and cup depth in conventional process management by means of a engraving stylus.
  • the hitherto strict, unchangeable arrangement of the grid as far as the size of the grid and the direction of the grid relative to the adjacent grid, can be advantageously varied by the engraving stylus is performed to perform the engraving process such that the grid point from a Is formed plurality of grid subdivisions.
  • the engraving stylus is performed to perform the engraving process such that the grid point from a Is formed plurality of grid subdivisions.
  • each sub-grid for forming the printing form and / or at least one separation of a printing form is separately addressed and controlled.
  • the engraving stylus can be addressed at any point to which the engraving stylus passes, at which the engraving stylus performs the engraving process by means of the movement of the engraving stylus, and the impulse controllable for each location of the engraving stylus, which determines the depth of the cup at the predetermined engraving location.
  • the formation of the wells in the manner of a conventional reproduction mode similar to the conventional Engraving etch, so, but it can also be advantageously carried out the formation of the wells in the manner of a autotypical reproduction mode, but it can also advantageously the training of the wells after Type of semi-autotypic playback mode done.
  • the cells which form the raster points are always meant. The same applies when partial grid points, partial grid cells and partial cells are mentioned.
  • a grid point can be formed by means of the diamond stylus from a plurality of individual partial cells or individual partial grid points.
  • a halftone dot can - as usual - but also be generated by a single act on the stylus with a suitably large signal.
  • the angles ⁇ are the different separations required for total color printing, i. the screen angles to i.d.R. 30 ° formed differently from each other, but, as already explained above, on a printing plate or a separation even the angle can be designed differently regardless of the advantageous relation described here.
  • the cutting angles ⁇ of a cutting tool in the form of a diamond engraving stylus in the range of 150 ° to 80 ° are formed large, these different training can also be selected depending on the material of the printing plate or the medium to be engraved.
  • the longitudinal axis of the wells or the wells formed of a plurality of Operanäpfchen traverses the grid points, this embodiment in a simple way always the inclination angle ⁇ to Wheelund / or linear motion of the printing plate or relative to a linear Movement direction and / or a rotational axis of the medium can be defined, ie this scheme can basically be chosen at all possible different angles ⁇ .
  • the method can be advantageously carried out such that for the engraving of a printing plate or a medium a plurality of diametrically different in their cutting angle ⁇ angle diamonds substantially simultaneously perform the engraving.
  • the engraving styluses since they have a concrete, three-dimensional shape, extend essentially in the transverse direction, in the longitudinal direction and in the height depending on the respective design.
  • the engraving stylus or the diamonds of the engraving stylus which are used for the formation of the side walls of the wells during engraving, simultaneously positioned with the engraving styli to form the same cup and can be controlled to perform the engraving .
  • imaging of a printing form is also possible much more precisely than with the classic engraving tools for classical vibration engraving.
  • a product prepared by the two methods described herein in the form of an imaged printing plate or engraved medium is characterized in that at least part of the screen is inclined at an angle ⁇ to an imaginary major axis of the printing plate or solid medium.
  • a printing form 10 for gravure printing is generally circular cross-section in cross section, that is formed overall in the form of a cylinder which rotates about a rotation or rotational axis 17, in the embodiment
  • the grid 12 which is formed here in the illustrated examples substantially in the form of a square grid 12, inclined at an acute angle ⁇ relative to the rotational and linear movement of the printing plate 10, wherein the Longitudinal axis 20 of the grid through the diagonally opposite points of the grid 12 and the wells, if they are then passes through.
  • the cups 13 formed here in the illustration of Fig. 3 each consist of five Operanäpfchen 130, viewed along a cross-sectional line through the longitudinal axis 20 of the wells 13, consist.
  • the printing plate 10 is rotated about the rotation axis 17, wherein the wells 13 and the Generalnäpfchen 130 are formed on respective tracks with respect to the printing plate 10.
  • the sub-wells 130 which are formed in the edge region of a cup 13, have a smaller depth than the sub-wells 130, which are formed in the intermediate region.
  • the density ie the removal of the material
  • the density in the core region of the wells 13 can first be reduced until they have the same density as in the edge region of the wells 13. Then, for example, the removal of the remaining sectionnäpfchen 130 corresponding to the individual predetermined density information.
  • the tracks shown have a finite extent.
  • the edges of the wells 13 are in the circumferential direction as shown by Fig. 1 reduced according to the given edge information.
  • the density value of the different edge information may differ from information to information.
  • the envelope of the tracks represents the well 13.
  • the formation of the wells 13 can be carried out in the manner of a conventional reproduction mode, which was previously reserved only for the above-described or above-described design of the wells by the known etching technique.
  • the formation of the wells 13 gem.
  • FIGS. 9 and 10 is a typical electromechanically actuated engraving tool in the form of a diamond shown as an actual tool for a stylus, with a stylus can be equipped.
  • Fig. 9 shows a diamond with a cutting angle ⁇ 1 of 80 °
  • Fig. 10 shows a diamond with a cutting angle ⁇ 2 of 50 °.
  • Fig. 8 a, 8 b . 8c and 8d correlate with the schemes listed below with respect to the control data for the equipped with a diamond or the like stylus for performing the grid points or sub-grid points (wells, Operanäpfchen).
  • the command data for the engraving stylus are different Engraving depths A1, A2, A3 for engraving depth T 1 , A4 and A6 for the engraving depth T 2 and finally A7 and A8 Engraving instructions for the engraving depth T 1 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
EP09012371A 2009-09-30 2009-09-30 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 Withdrawn EP2305464A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09012371A EP2305464A1 (fr) 2009-09-30 2009-09-30 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

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09012371A EP2305464A1 (fr) 2009-09-30 2009-09-30 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

Publications (1)

Publication Number Publication Date
EP2305464A1 true EP2305464A1 (fr) 2011-04-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP09012371A Withdrawn EP2305464A1 (fr) 2009-09-30 2009-09-30 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

Country Status (1)

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EP (1) EP2305464A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114132049A (zh) * 2021-10-21 2022-03-04 黄山精工凹印制版有限公司 一种节省触感光油上墨量的版辊加工工艺

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1568490A1 (fr) * 2004-02-27 2005-08-31 Hell Gravure Systems GmbH Procédé de gravure directe des cellules pour recevoir l'encre en rotogravure
EP2001218A1 (fr) * 2007-06-06 2008-12-10 Ernst-Rudolf Dr. Weidlich Procédé destiné à graver une forme d'impression à l'aide d'une lumière laser

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1568490A1 (fr) * 2004-02-27 2005-08-31 Hell Gravure Systems GmbH Procédé de gravure directe des cellules pour recevoir l'encre en rotogravure
EP2001218A1 (fr) * 2007-06-06 2008-12-10 Ernst-Rudolf Dr. Weidlich Procédé destiné à graver une forme d'impression à l'aide d'une lumière laser

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114132049A (zh) * 2021-10-21 2022-03-04 黄山精工凹印制版有限公司 一种节省触感光油上墨量的版辊加工工艺
CN114132049B (zh) * 2021-10-21 2022-07-22 黄山精工凹印制版有限公司 一种节省触感光油上墨量的版辊加工工艺

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