EP3900934A1 - Dispositif de génération d'une impression sur une matière d'impression et procédé de génération d'une pluralité de cavités sur une forme d'impression dotée d'une matrice magnétique - Google Patents

Dispositif de génération d'une impression sur une matière d'impression et procédé de génération d'une pluralité de cavités sur une forme d'impression dotée d'une matrice magnétique Download PDF

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Publication number
EP3900934A1
EP3900934A1 EP20170576.1A EP20170576A EP3900934A1 EP 3900934 A1 EP3900934 A1 EP 3900934A1 EP 20170576 A EP20170576 A EP 20170576A EP 3900934 A1 EP3900934 A1 EP 3900934A1
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EP
European Patent Office
Prior art keywords
printing
cavities
print
cover layer
grid
Prior art date
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Granted
Application number
EP20170576.1A
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German (de)
English (en)
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EP3900934B1 (fr
Inventor
Sebastian Dicke
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Flooring Technologies Ltd
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Flooring Technologies Ltd
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Publication of EP3900934A1 publication Critical patent/EP3900934A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F1/00—Platen presses, i.e. presses in which printing is effected by at least one essentially-flat pressure-applying member co-operating with a flat type-bed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/001—Heliostatic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/10—Intaglio printing ; Gravure printing
    • 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
    • B41N1/00—Printing plates or foils; Materials therefor
    • 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
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/04—Printing plates or foils; Materials therefor metallic
    • B41N1/06—Printing plates or foils; Materials therefor metallic for relief printing or intaglio printing
    • 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
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/16—Curved printing plates, especially cylinders
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G19/00—Processes using magnetic patterns; Apparatus therefor, i.e. magnetography

Definitions

  • the invention relates to a device for generating a print on a printing material, the device comprising at least one printing form, at least one device for dispensing a printing medium, at least one device for data transmission and at least one device for control.
  • the printing form has a printing element, a magnetic grid and a cover layer, the magnetic grid being applied to the surface of the printing element and the cover layer being located above the magnetic grid. Magnetic particles are contained in the top layer.
  • each grid point of the magnetic grid can be controlled independently of the other grid points of the magnetic grid, and the cover layer is designed to form a plurality of cavities for receiving a printing medium.
  • the invention further relates to a method for generating a plurality of cavities on a printing form, the printing form comprising a printing body, a magnetic grid and a cover layer, the magnetic grid being on the surface of the printing body and a cover layer being applied over the magnetic grid, the magnetic Has particles.
  • Each grid point of the magnetic grid can be addressed electrically via a controller, independently of the other grid points of the magnetic field grid.
  • a voltage is applied to each grid point of the magnetic grid at the position of which a cavity is to be created on the surface of the printing form. The applied voltage creates a magnetic field which attracts the magnetic particles in the cover layer, as a result of which a cavity is formed on the surface of the printing form at this position.
  • printing technology encompasses all processes for the reproduction of printing samples, such as letterpress, offset printing, gravure printing, flexographic printing, screen printing and digital printing.
  • printing techniques different methods are used in order to transfer a printing medium, such as an ink, to a printing substrate.
  • a printing medium such as an ink
  • the areas of application of printing technology are very diverse. For example, the printing of print media, wallpaper or the like is known. But in the production of floor laminate or wall and ceiling cladding elements, the so-called Decorative printing used. Wood-based panels are often printed here. There are several approaches to decorating wood-based panels. In the past, wood-based panels were often coated with decorative paper, although there are no limits to the variety of decorative papers with different patterns. As an alternative to the use of decorative papers on wood-based panels, the possibility of direct printing on wood-based panels has been developed, whereby printing on paper and its subsequent lamination or direct coating on the wood-based panels is no longer necessary.
  • the printing techniques mainly used here are gravure and digital printing processes. For the use of this printing process, the print decoration is available as a digital template that depicts the colors and color distribution of the print decoration.
  • the gravure printing process is a printing technique in which the elements to be imaged are present as cavities, i.e. depressions, in a static pressure body, e.g. a printing roller or a printing plate, which is provided with a printing medium, such as a color, before printing.
  • the printing medium is primarily located in the depressions and is transferred to the object to be printed, the printing material, due to the contact pressure of the printing form and the adhesive forces.
  • a printing medium such as a color
  • the printing media used for gravure printing in particular the pigment-containing liquids such as paints, are available in a wide range and are relatively inexpensive.
  • a printing roller As an example, a steel cylinder is encased in a 2mm thick copper layer, which is called the base copper. On this inner copper layer either an engravable copper layer of about 100 ⁇ m is galvanized or a removable Ballard skin is applied. There is a separating layer between the Ballard skin and the base copper, which means that the Ballard skin can be removed after printing and replaced with a new one.
  • the print pattern is broken down into tiny printing form elements called cells, around the cells there are non-printing elements called bars.
  • the print pattern is therefore broken down into a grid in gravure printing.
  • the cells are filled with the printing medium before printing and excess printing medium is usually wiped off with a squeegee.
  • the squeegee consists of a steel ruler corresponding to the length of the printing cylinder.
  • the print pattern is applied in the form of a raster to the engravable copper layer or to the Ballard skin; this can be done by chemical etching, electromechanically or by means of a laser. In In each case, a static printing form with an unchangeable arrangement of cells is created.
  • a separation file is created at the beginning of the printing process, in which the print pattern is broken down into the basic colors to be printed.
  • the arrangement of the cells on the printing form is different for each color to be printed, so an associated Ballard skin must be made for each color in conventional gravure printing.
  • the individual basic colors are then printed one after the other on the substrate.
  • the Ballard skin of a pressure roller can be exchanged. To do this, the Ballard skin must first be removed from the roller body, then the roller body is cleaned and provided with a new separating layer. A new Ballard skin can then be applied to the new separating layer.
  • the disadvantage of gravure printing is therefore that at least one Ballard skin has to be made for each print pattern, the arrangement of which can no longer be changed. This makes gravure costly in many ways.
  • the Ballard skins not only have to be made separately for each print sample, but also have to be stored after the print has been carried out.
  • changing the Ballard skins on the pressure hulls is complex and time-consuming.
  • the width / length of the print pattern is limited to the size of the printing form. Either by the circumference and width of the printing roller or by the dimensions of the printing plate.
  • the circumference of the print roller limits the print data length of the print pattern and the width of the print roller limits the print data width of the print pattern.
  • the person skilled in the art understands the print data length to be the length of the completely printed print pattern and the print data width to mean the width of the completely printed print pattern. If a larger print pattern is to be printed than the print form allows, this must be done in parts. This procedure is very complex and error-prone, since the transitions between the individually printed parts of the print pattern must be adhered to exactly in order to obtain a harmonious print result.
  • repeats are printed.
  • Repeat refers to a constantly recurring, identical print pattern.
  • printing rollers are used for printing with repeats, the repeat being determined by the circumference of the printing roller.
  • the maximum length of the print data of the print pattern recurring in the repeat can be as long as the circumference of the roller.
  • a repeat i.e. the print pattern
  • the print pattern is shorter, i.e. if several repeats fit on one roller circumference, the print data length of the print sample must be selected so that the circumference of the print roller is optimally used. This is the only way to guarantee an economical way of working.
  • gravure printing therefore also has the disadvantages mentioned.
  • digital printing the print pattern is transferred directly from a computer to a digital printer such as a laser printer or an inkjet printer.
  • a digital printer such as a laser printer or an inkjet printer.
  • digital printing there is therefore no need to use static printing forms and thus also the limitations in the print data length and print data width of the print samples.
  • Digital printing thus offers a high degree of flexibility and variability with regard to the print motifs and does not entail any restrictions in the repeat.
  • digital printing is also known, for example, for printing wood-based panels.
  • the EP 2 181 852 B1 for example, relates to a digital printing process for printing flat wood-based panels.
  • the flat plates are printed directly with a digital printer.
  • the EP 2 636 531 A1 also relates to a digital printing method for printing on a surface of a workpiece.
  • a print roller is provided with a print pattern by a digital printer and this print pattern is then applied to the workpiece by the print roller.
  • CMYK The basic colors cyan, magenta, yellow and black
  • CMYK color model is a subtractive color model, whereby the abbreviation CMYK stands for the three color components cyan, magenta, yellow and the black component key as color depth.
  • CMYK stands for the three color components cyan, magenta, yellow and the black component key as color depth.
  • the print medium is applied drop by drop onto the printing material.
  • the drop When leaving the print head nozzle, the drop typically forms a ligament which, in the optimal case, is sucked into the drop.
  • the ligament atomizes and forms a fine mist. This spray contaminates the nozzles of the printhead and other elements of the printing device. Over time, this worsens the print quality and cleaning of the printer is necessary. This is time-consuming and therefore costs money.
  • the spray mist accumulates in the surrounding air over time and poses a health risk for the workers who work on the machines.
  • Part of the ligament can also loosen in the front part of the drop and then form a so-called satellite on the printing material. This deteriorates the print image and thus the quality of the print.
  • Another problem is the condensation of water vapor on the printhead, which can impair the print quality or even damage the printhead.
  • the object of the present invention is therefore to overcome the disadvantages of the prior art and to provide a device and a method for generating a print on a printing material which combines the robust and economical printing technology of gravure printing with great flexibility with regard to the printable Print samples of digital printing combined.
  • a method for printing a printing material with a device according to one of Claims 1 to 8 with a digital print pattern characterized in that cavities are formed on the device which are suitable for reproducing the digital print pattern on a printing material; a print medium is received from the device by a device for dispensing a print medium; and the digital print pattern is printed directly or indirectly on the printing material with the device.
  • the device according to the invention for generating a print on a printing material comprises at least one printing form, at least one device for dispensing a printing medium, at least one device for data transmission and at least one device for control.
  • the printing form of the present invention comprises a printing body, a magnetic grid and a cover layer.
  • the pressure body is a pressure body as it is known from gravure printing.
  • the pressure body is preferably a pressure roller or a pressure plate.
  • the pressure body is a pressure roller.
  • Steel cylinders, for example, are typical here.
  • the pressure bodies can have all dimensions customary in the field of printing.
  • a magnetic grid is applied to the surface of the pressure body.
  • the magnetic grid is preferably exactly the same size as the surface of the pressure body and thus covers it precisely.
  • the magnetic grid is designed in such a way that a grid is formed from an electrically conductive material and each grid point is individually electrically addressable. Grid points are understood to be the nodes of the grid, while the grid cells are spanned between the grid points.
  • a controllable voltage can be applied to each grid point, creating a magnetic field. Since each grid point can be controlled individually, a magnetic field is generated by applying a voltage to precisely defined grid points at precisely defined positions in the cover layer.
  • the magnetic grid can be firmly applied to the printing body or else be embedded in a material which is applied as a layer to the printing body.
  • the material in which the magnetic grid is embedded is preferably a flexible material that can adapt to the shape of the pressure body, for example in the form of a film.
  • the material in which the magnetic grid is embedded is preferably non-magnetic and also non-magnetizable.
  • a cover layer is located above the magnetic grid, the cover layer having magnetic particles.
  • the cover layer is preferably exactly as large as the magnetic grid and thus completely covers it.
  • the magnetic grid and the overlying cover layer are exactly large enough that the entire surface of the pressure body is covered by them. This has the advantage that the entire surface of the printing body can be used for printing a printing material.
  • the cover layer has a height so that cavities can be formed in it.
  • the cover layer therefore has a height between 30 and 150 ⁇ m, preferably between 40 and 120 ⁇ m, particularly preferably between 50 and 100 ⁇ m.
  • the cover layer has a material from the group comprising elastomers and smart materials.
  • the magnetic particles are firmly embedded in this material.
  • the material of the cover layer has such an elasticity that it can be deformed by external forces.
  • the material is at least partially deformable by an applied magnetic field, in that the magnetic particles firmly embedded in the material are attracted by a magnetic field and thereby deform the surrounding material.
  • depressions in the form of cavities can thus be formed on the surface of the cover layer.
  • the cavities represent depressions in the cover layer which are designed in such a way that they can accommodate a printing medium.
  • the cavities are designed as cells, as they are known from conventional gravure printing.
  • the cells are also used to hold a printing medium in a printing process.
  • the cover layer has a permanently elastic film made of an elastomer.
  • the cover layer can be designed as a permanently elastic film made of an elastomer, in which magnetic particles are embedded.
  • Smart materials are materials that can change their mechanical properties. When an electrical voltage acts, these materials change from a non-deformable state to a state in which they are deformable.
  • Well-known materials here are hybrid materials made of metal and liquid.
  • An example of such a hybrid material is a combination of gold, in which numerous pores and channels are formed by etching, with a conductive liquid, such as saline solution or a dilute acid, which is filled into the pores and channels.
  • the cover layer contains magnetic particles which are distributed in the cover layer.
  • the magnetic particles have a diameter between 5 nm and 5 ⁇ m, preferably between 200 nm and 1 ⁇ m, particularly preferably between 300 nm and 1 ⁇ m. Any kind of magnetic material, such as iron or Iron oxide, which is present in a corresponding size, is suitable as a magnetic particle.
  • the magnetic particles are preferably evenly distributed in the cover layer. In a further embodiment of the invention, however, the magnetic particles can also be unevenly distributed in the cover layer.
  • each raster point is therefore able to form at least one cavity.
  • the voltage applied to the grid points can be regulated.
  • two states can be generated in this way.
  • the applied voltage is zero at one or more raster points, so no magnetic field is generated at these points and the cover layer of the printing form is not deformed at these positions, i.e. no cavities are formed.
  • a voltage is applied to one or more grid points, so a magnetic field is generated at these points and the cover layer is deformed accordingly.
  • the deformation takes place in such a way that cavities are formed at the corresponding points on the cover layer of the printing form.
  • the strength of the applied voltage also regulates the strength of the magnetic field, so that deeper cavities are formed when the magnetic field is stronger than when the magnetic field is weaker. According to the invention, the depth of the cavities can thus be regulated by regulating the strength of the applied voltage.
  • the brightness values can advantageously be taken into account in a print pattern, since depending on the depth of the cavity, the volume of the cavity can be varied and thus different amounts of print medium can be accommodated in the cavity.
  • conventional gravure printing this is done in an analogous manner by engraving cells with different depths.
  • the depth of each cavity can advantageously be changed between two printing processes without converting the printing form. In conventional gravure printing, this is not possible due to the engraving of the printing form.
  • a new Ballard skin with a different engraving has to be laboriously applied to the pressure body.
  • the printing form is therefore set up so that the depth and thus the volume of the cavities can be adjusted via the voltage applied to the grid nodes.
  • the cavities on the surface of the cover layer have a depth in the range from 2 ⁇ m to 100 ⁇ m, preferably in the range from 2 ⁇ m to 80 ⁇ m, particularly preferably in the range from 2 ⁇ m to 80 ⁇ m.
  • the cover layer furthermore has areas made of a second material from the group comprising thermoplastics and thermosets.
  • the second material is preferably non-magnetizable and also has no magnetic particles.
  • areas made of the second material are arranged in the areas of the raster points.
  • the areas made of the second material are designed such that when the cover layer is deformed by the application of a voltage, the shape of the cavities that are formed is influenced by the shape of the areas made of the second material. The shape of the areas made of the second material can thus influence the shape of the cavities.
  • the cavities in such a way that they can assume all shapes of the cells known from conventional gravure printing. Since the shape of the cavities also has an effect on their volume, different scoop volumes can be generated analogously to conventional gravure printing by varying the depth and / or shape of the cavities. The scoop volume is to be equated with the volume of the cavity.
  • the scoop volume is determined by the gray levels in the color separation data.
  • the volume of the individual cavities required for the printing process is therefore determined as a function of the gray levels of a print pattern or the separation data generated from the print pattern. The depth and thus the volume of the cavities are then set as described using the voltage applied to the grid points.
  • the shape of the cavity describes both the shape of the cavity when the cover layer is viewed from above and the shape of the cavity when the cover layer is viewed in cross section.
  • the printing form is therefore set up so that the shape of the cavities can be influenced by the arrangement and shape of the areas of the cover layer that consist of the second material.
  • the cavities preferably have a circular or elliptical surface when the cover layer is viewed from above.
  • the cavities particularly preferably have an elliptical surface.
  • the elliptical and circular areas are preferably used, the elliptical shape producing the smoothest progression between light and dark tonal values during a printing process.
  • the cavities in a different shape, depending on the arrangement of the areas made of the second material in the cover layer. It is thus also possible to form cavities that have an angular surface when the cover layer is viewed from above. For example, a triangular, square or polygonal surface. If the cavities are angular, in a preferred embodiment they have a square area when the cover layer is viewed from above.
  • cavities can be formed which have all cross sections known from conventional gravure printing.
  • these can be cavities in the form of a pointed pyramid, truncated pyramid or in the form of a truncated pyramid with steep flanks or cavities with a pointed dome, with a normal dome or with a U-shape with steep flanks and a flat bottom.
  • the arrangement of the regions made of the second material in the cover layer leads to regions being formed in the cover layer which serve as webs between adjacent cavities.
  • the bars represent the non-printing areas of the printing form. Bars are known from conventional gravure printing and there also serve to delimit adjacent cavities. The bars can stabilize the cover layer of the printing form and thus make it easier to remove the excess ink with a squeegee.
  • the areas of the cover layer which consist of the second material are therefore arranged and shaped in the cover layer in such a way that they serve as webs between adjacent cavities.
  • the cover layer can be designed as a permanently elastic film made of an elastomer, in which magnetic particles are embedded and which has areas made of a second material.
  • the cover layer is set up to form a plurality of cavities for receiving a printing medium.
  • the cavities are formed at the positions at which they are necessary for printing a predetermined print pattern.
  • each cavity reflects a pressure point in the print pattern.
  • a typical roller that is used in conventional gravure printing has a screen with a screen ruling of 60 Ipi, that is to say 60 lines per cm.
  • 8,400 * 7,800 65,520,000 cavities can be formed on the entire top layer of the roller.
  • the magnetic grid is designed so that 65,520,000 grid points are available that can be controlled individually.
  • the device is set up to form cavities with a screen width in the range 10 Ipi to 80 Ipi, preferably in the range 30 Ipi to 70 Ipi, particularly preferably 60 Ipi.
  • the printing form additionally has a sensor.
  • the sensor is suitable for determining exactly a position on the circumference of the roller. With the aid of the sensor, it is advantageously possible to determine exactly at which point on the circumference of the roller it is currently printing.
  • the device according to the invention also has a device for dispensing a print medium.
  • the device for dispensing a printing medium preferably has a container with a doctor blade or lines for transporting the printing medium.
  • the device for dispensing a printing medium has a container with a doctor blade.
  • the container contains the printing medium and the printing form is immersed in the printing medium in the container, so that the cavities on the top layer of the printing medium are completely flooded with the printing medium will.
  • the squeegee then removes the excess printing medium, so that there is only printing medium in the cavities, but the cover layer between the cavities is free of the printing medium.
  • the use of a container with a doctor blade is particularly advantageous if the pressure body is a cylinder.
  • Embodiments of doctor blades are known from the prior art, for example the doctor blade can be designed in the form of a steel ruler.
  • the device for dispensing a pressure medium has a container with an air curtain.
  • the container contains the printing medium and the printing form is immersed in the printing medium in the container, so that the cavities on the top layer of the printing medium are completely flooded with the printing medium. The excess pressure medium is then removed through the air curtain.
  • the device for dispensing a printing medium has a container with a doctor blade or a container with an air curtain are particularly advantageous if the printing form has a printing roller as the printing body.
  • the device for dispensing a printing medium has at least one application roller and a doctor blade.
  • the printing medium is applied to the printing form with the at least one applicator roller and the excess printing medium is then removed with the aid of the at least one doctor blade.
  • This embodiment is particularly advantageous if the printing form has a printing plate as the printing body.
  • the device for dispensing a printing medium has lines for transporting the printing medium.
  • the lines advantageously run through the printing body and the magnetic grid and end in the cover layer of the printing form.
  • the lines are positioned so that each cavity which is formed on the cover layer can be filled with pressure medium.
  • the cavities can advantageously be filled from the interior of the pressure body.
  • the lines are connected to corresponding containers that contain print media.
  • the cavities can be filled in a targeted manner using suitable pumping and control devices. These devices and their use are known to the person skilled in the art.
  • the printing medium has at least one pigment-containing liquid or at least one functional material.
  • printing media can therefore be pigment-containing inks which are suitable for gravure printing.
  • pigment-containing liquids can also be pigment-containing lacquers, for example acrylic lacquers or PU lacquers.
  • the printing medium can have functional materials.
  • powder or fibers can serve as functional material. These can be used, for example, to create 3D structures on a printing material. All materials used in conventional 3D printing can be used. These are known to the person skilled in the art.
  • the functional materials can be incorporated into a liquid, for example into an ink.
  • the liquid only serves to distribute the functional materials more homogeneously and evaporates after application or can be removed after application.
  • the printing medium has functional materials that are conductive.
  • These functional materials can be selected from the group comprising carbon black, carbon fibers, metal powder, salts, alloys, nanoparticles, in particular carbon nanotubes and conductive polymers such as polypyrroles. Combinations of these substances can also be used.
  • the printing medium has functional materials in the form of organic and / or inorganic coloring pigments, the pigments containing at least one substance or at least one composition of matter whose color can be changed by changing a physical variable acting on the pigments.
  • substances or compositions of matter can be hydrochromic, piezochromic, photochromic, thermochromic or phosphorescent dyes. In this way, it is possible to change the color of the print on the printing material and the elements produced therefrom, for example for floor coverings, wall and / or ceiling coverings, by changing the moisture content, the temperature or the pressure.
  • the printing medium can also have a binding agent as the functional material, wherein the binding agent can be both an inorganic and an organic agent or a mixture thereof. Resin-containing binders are often used.
  • the printing medium has functional materials that are suitable for printing electronic components.
  • Both organic and inorganic materials are used for printed electronics. These materials are preferably in liquid form; H. as a solution, dispersion or suspension. This is particularly true of many organic functional materials that are used as conductors, semiconductors or insulators.
  • the inorganic materials are dispersions of metallic micro- or nanoparticles. Suitable nanoparticles can, for example, have a conductive coating on a non-conductive core.
  • the most common materials used in printed electronics include the conductive polymers poly-3,4-ethylenedioxythiophene doped with polystyrene sulfonate, polypyrrole and polyaniline.
  • polymers are commercially available in various formulations. Alternatively, silver, gold and / or copper nanoparticles are used. In addition to polymer and metallic materials, carbon is also moving into the focus of this technology as a robust material for printed electronic applications. Numerous polymer semiconductors are processed using inkjet printing. Examples of polymeric semiconductors are polythiophenes such as poly (3-hexylthiophene) and poly-9,9-dioctylfluorenecobithiophene. Printable organic and inorganic insulators or dielectrics exist in large numbers.
  • phase change materials are materials whose latent heat of fusion, heat of solution or heat of absorption is significantly greater than the heat that they can store due to their normal specific heat capacity, i.e. without the phase change effect. These materials are suitable, among other things, to generate latent heat storage.
  • the printing medium can have luminescent pigments in the form of electroluminophores or luminescent substances as functional material.
  • Electroluminophores are pigments that can be excited to luminescence by an alternating electric field.
  • a suitable electroluminophore is, for example, zinc sulfide which is doped with various metals such as manganese (ZnS: Mn), gold, silver, copper or gallium.
  • ZnS: Mn manganese
  • luminescent substances are also preferred fluorescent and / or phosphorescent substances on an inorganic or organic basis, in particular zinc sulfide and alkaline earth aluminates, are used.
  • the printing medium can have monocrystalline materials as functional material, which can serve as piezoelectric sensors.
  • monocrystalline materials such as quartz, tourmaline and gallium phosphate are preferred.
  • the printing medium can have abrasion-resistant particles, natural fibers, synthetic fibers and / or flame retardants as functional material.
  • resins such as melamine-formaldehyde resin, or urea-formaldehyde resin, acrylate and polyurethane resins can be used as suitable binders. These types of functional materials are suitable for applying a protective layer to a printing substrate.
  • the abrasion-resistant particles are preferably selected from the group comprising aluminum oxides, corundum, boron carbides, silicon dioxides, silicon carbides and glass particles.
  • the natural and / or synthetic fibers used are in particular fibers selected from the group comprising wood fibers, cellulose fibers, wool fibers, hemp fibers and organic or inorganic polymer fibers. For example, a mixture of conventional silanized corundums of different grain sizes is used as corundum.
  • Phosphates, borates, in particular ammonium polyphosphate, tris (tri-bromoneopentyl) phosphate, zinc borate or boric acid complexes of polyhydric alcohols are preferably used as flame retardants.
  • the device has at least one device for control.
  • the at least one device for control is a PC, a tablet or another data processing device.
  • the control device is set up in such a way that it regulates the voltage at the grid points.
  • the print pattern to be printed on the substrate is stored on the PC, tablet or data processing device and, depending on the color values of the print pattern, the voltage at the raster points is regulated in such a way that cavities are formed on the cover layer of the printing form so that the print pattern can be applied to the Printing material can be mapped.
  • the control device is preferably able to create a digital separation file for the different colors of the print pattern. For this purpose, the data are sent from the control device to the magnetic grid.
  • the data for dispensing the print medium are also transmitted from the device for controlling the device for dispensing a print medium. It is thus possible to control the amount and type of printing medium that is delivered to the respective cavities.
  • the device according to the invention also has at least one device for data transmission.
  • the device for data transmission has at least two transmitter / receiver devices which are set up to transmit data in a contactless manner. Suitable transmitter / receiver devices are set up both to send and receive data in a contactless manner.
  • a transmitter / receiver device is connected to the control device, and another transmitter / receiver device is located on the printing form. It is thus possible to transfer information from the control device to the magnetic grid and vice versa.
  • Contactless data transmission is possible using WLAN, Bluetooth or similar methods, for example.
  • contactless data transmission also includes contactless optical data transmission. This is possible, for example, using fiber optics.
  • the contactless data transmission has the advantage that the data transmission can be guaranteed without any problems even at high speeds and that this type of data transmission is largely characterized by freedom from wear.
  • the device for data transmission has at least one contact.
  • this contact is a slip ring transmitter.
  • Slip ring transmitters are already known from the prior art and are used to transmit information to rotating elements.
  • a slip ring transmitter is preferred when the pressure body is a cylinder. The slip ring transmitter is then positioned in such a way that it can transmit information from the control device to the printing form and vice versa.
  • all grid points on the magnetic grid are networked for the purpose of data transmission.
  • a part of each of the grid points is connected to a central network via an intermediate network.
  • the networking takes place via electronic connections such as lines, circuit boards and / or conductor foils.
  • the central networking ends in at least one contact or in at least one transmitter / receiver device.
  • the device for dispensing a print medium has lines for transporting the print medium, in one embodiment of the invention there is also a transmitter / receiver device on the device for dispensing a print medium. It is thus possible to transmit information from the device for control to the device for delivery of a print medium and vice versa.
  • the device for dispensing a print medium is connected to the device for control via a data cable.
  • the device according to the invention has a plurality of contacts or a plurality of transmitter / receiver devices.
  • the printing form has, for example, two, three or four contacts or transmitter / receiver devices. This ensures that the data transfer can also be carried out with an increased data volume.
  • the device for data transmission has at least two transmitter / receiver devices which are set up to transmit data in a contactless manner and / or the device for data transmission has at least one contact.
  • a combination of the devices for data transmission is possible according to the invention.
  • the device according to the invention provides a printing form in which both the arrangement of the cavities and their shape can be changed without the printing form having to be converted for this purpose.
  • the cavities can be formed using a controllable voltage. There is therefore advantageously no need to produce at least one engraved static printing form for each print pattern and to change and store it in the printing process, as is the state of the art in conventional gravure printing.
  • the device according to the invention enables the use of a printing form for any number of printing patterns.
  • the printing form has a sensor which is suitable for determining exactly a position of the circumference of the roller. With the help of the sensor it is possible to determine exactly at which point on the circumference of the roller it is currently printing. This means that the cavities can be rearranged and shaped on the roller after a printing process. As the printing process progresses, the cavities can therefore continuously map other pressure points in the print pattern.
  • the present invention therefore makes it possible to print digital print patterns on printing materials which have a longer print data than the circumference of the roller.
  • this offers the advantage that the circumference of a printing roller can be selected independently of the print data length or the length of a repeat of a print pattern. It is therefore no longer necessary to provide rollers with different circumferences in production in order to print print samples with different print data lengths.
  • the print data length that can be printed is no longer dependent on the rollers present. Any print data length can be printed with the present invention with a platen. This offers an enormous economic advantage and an enormously increased flexibility compared to conventional gravure printing devices.
  • the depth and thus the volume of a cavity is determined by the strength of the voltage applied to the associated grid point of the magnetic grid. The greater the voltage that is applied to the associated grid points, the stronger the magnetic field generated and the stronger the magnetic particles in the cover layer are attracted by the magnetic field. Correspondingly, the depth and thus the volume of the cavity formed is also greater.
  • the shape of the cavities can be influenced by the cover layer.
  • areas made of a second material are arranged in the cover layer.
  • the second material cannot be magnetized and also has no magnetic particles.
  • the areas made of the second material are preferably designed in such a way that when the cover layer is deformed by the application of a voltage, the shape of the cavities that are formed is influenced by the shape of the areas made of the second material.
  • the shape of the areas made of the second material can thus influence the shape of the cavities. If the cavities are used as cells for gravure printing, it is possible according to the invention to form all cell shapes that are known from conventional gravure printing.
  • the shape of the cavities can therefore be influenced by the arrangement and shape of regions made of a second material in the cover layer.
  • the method according to the invention allows cavities of different depths and different shapes to be formed on the cover layer. If the cavities are designed as cells for gravure printing, it is in principle possible to design all cell shapes and cell depths that are known from conventional gravure printing.
  • cavities are formed in the form of cells, which are preferably circular, with a diameter of 0.05 to 0.15 mm, particularly preferably with a diameter of 0.1 mm.
  • circular refers to the shape of the cells when the top layer is viewed from above.
  • the shape of the cells, viewed in the cross section of the cover layer, can be designed as desired.
  • cavities are first formed on the printing form, the position of which on the cover layer, depth and shape is suitable for printing a predetermined print pattern.
  • the necessary data are transmitted to the printing form via the device for data transmission via the device for data transmission and the voltage at the individual raster points is thus controlled.
  • the digital print pattern can have a maximum print data width that is as wide as the printing form used. However, a digital print pattern with a smaller print data width can also be printed. In this case, cavities are only formed at those points on the printing form that are necessary for printing the digital print pattern.
  • a printing medium is received from the printing form by a device for dispensing a printing medium, that is to say the cavities formed on the top surface of the printing form are filled with a printing medium.
  • the device according to the invention can therefore also be used more flexibly in this respect than conventional printing devices.
  • the digital print pattern is then printed directly or indirectly on a substrate.
  • direct printing the printing medium is transferred directly from the printing form to a printing material.
  • the process for direct printing is carried out in the same way as direct printing in the conventional gravure printing process.
  • a so-called impression roller exerts contact pressure on the printing material in the printing process, so that the transfer of the print medium can take place in the printing process.
  • the digital print pattern can also be transferred indirectly to a printing material.
  • Methods for indirect printing are also known from conventional gravure printing and can be used in the present invention.
  • indirect printing can be carried out using a rubber roller as a carrier.
  • the printing pattern is transferred to a rubber roller by the device according to the invention and is applied to a printing material by the rubber roller.
  • the print pattern is printed indirectly on a structured surface.
  • the device according to the invention applies the print pattern to a flexible transfer element.
  • the flexible transfer element is guided over a deflection roller and then the print pattern is transferred to the printing material.
  • the flexible transfer element is pressed against the printing material with a movable counter-pressure roller.
  • the movable counter-pressure roller can adapt to the structuring of the printing material in such a way that there is a sufficiently high contact pressure at all times during the transfer of the printing medium to the printing material. The contact pressure is sufficiently high if an error-free transfer of the print medium is guaranteed.
  • the movable counter-pressure roller also has an elastic coating such that the flexible transfer element is at least partially pressed into structures on the surface of the printing material, so that error-free transfer of the printing medium is guaranteed.
  • Suitable flexible transmission elements have such an elasticity that they can adapt to structures on the surface of the printing material.
  • the flexible transmission element can have a material contained in a group comprising foam, rubber, elastomers and textiles.
  • the screen angulation according to DIN 16 547 known from the prior art can also be implemented with the present invention.
  • the screen angle With the screen angle, the basic colors of the CMYK color space are printed on top of each other in different screen angles.
  • the angles of the basic colors are specified in DIN 16 547.
  • the screen angle avoids noticeably disruptive patterns such as moiré effects or reduces their conciseness.
  • the arrangement of the cavities on the printing form is changed after the transfer of the printing pattern onto the printing material.
  • the arrangement of the cavities on the printing form is changed immediately after the transfer of the printing medium to the printing material.
  • the arrangement of the cavities can already be changed before the complete print pattern has been printed.
  • the printing form advantageously also has a sensor with which it can be determined exactly at which position on the circumference of the roller the printing form is currently printing. In this way, the cavities on the cover layer that have already printed and those that have not yet printed can be changed in a targeted manner.
  • This embodiment is particularly advantageous when using a roller as a printing form, since according to the invention the repeat length of a print pattern is no longer restricted to the roller circumference or has to be coordinated with it.
  • the present invention therefore makes it possible to print a much larger selection of print patterns than is possible with conventional gravure printing, in which the dimensions of a print pattern are limited by the circumference of the roller.
  • all print patterns that can also be processed with the conventional gravure printing method can therefore serve as digital print patterns.
  • the present invention can also be used to print print patterns whose print data length is greater than the roller circumference of the printing form when a roller is used as a printing body.
  • the digital print pattern is, for example, a decorative template that is used in the decorative design of laminates that are used for floor, wall and / or ceiling coverings.
  • a decorative template that is used in the decorative design of laminates that are used for floor, wall and / or ceiling coverings.
  • any wood, tile, stone, fantasy decors or parquet imitations can be applied to printing materials. Templates from nature are often used to produce these decors, which are applied to a substrate after digitization or after additional digital processing with software.
  • Print electronics refers to electronic components, assemblies and applications that are completely or partially produced using printing processes. Instead of the printing inks, electronic functional materials, which are available in liquid or paste form, are printed. Suitable functional materials have already been described at the beginning.
  • the materials necessary for the production of the functional layer can be incorporated into a liquid.
  • the ink used for printing itself represents the functional layer.
  • the liquid only serves to distribute the functional layer more homogeneously and that it evaporates or can be removed after application.
  • any material that is suitable for applying a printing medium is suitable as a printing material.
  • the printing material can have a smooth or a rough surface to which the printing medium is applied.
  • the printing material according to the present invention is selected from a group comprising paper, glass, metal, foils, wood-based materials, in particular MDF or HDF boards, WPC boards, veneers, layers of lacquer, plastic boards, fiber-reinforced plastic, hard paper and inorganic carrier plates.
  • the printing material has at least one flat shape which can be printed with the printing formes according to the invention.
  • Suitable printing materials can therefore be, for example, laminates, furniture panels, furniture fronts, countertops, door fronts, wallpaper, papers and glass surfaces.
  • the printing material can have a smooth surface or a structured surface. If the printing material has a structured surface, the printing material is preferably printed indirectly. This procedure has already been described at the beginning.
  • paper is used as the printing material.
  • Paper suitable as printing base paper is preferably white and has a weight of 60 to 90 g / m 2 , preferably 65 to 80 g / m 2 , particularly preferably 70 g / m 2 .
  • the paper is provided with a primer in order to prime it. Suitable agents which can be used as primers are known to the person skilled in the art.
  • Printed decorations are used, for example, in the production of floor laminate or in the form of wall and ceiling cladding elements.
  • the printing material is preferably a wood-based panel.
  • the printing material is a wood-based panel.
  • At least one primer layer comprising at least one resin and / or at least one lacquer is applied to the side of the wood-based panel to be printed before printing with the digital print pattern, which is then dried and / or cured .
  • the side of the wood-based panel to be printed is preferably sanded before the primer is applied.
  • an aqueous resin solution and / or a radiation-curable filler compound can be applied to the side of the carrier material to be printed.
  • Aqueous resin solutions such as melamine-formaldehyde resin, urea-formaldehyde resin or melamine-urea-formaldehyde resin can be used as primers. It is also possible to pre-coat or prime the carrier material with 1K / 2K acrylate, UV and / or ESH filler and then cure this primer layer accordingly.
  • An aqueous resin solution is preferably used for the pre-coating or priming of the wood-based panel, which is an aqueous resin solution, in particular an aqueous solution of a melamine-formaldehyde resin, urea-formaldehyde resin or melamine-urea-formaldehyde resin.
  • the amount of liquid resin solution applied for the primer can be between 10 and 80 g / m 2 , preferably 20 and 50 g / m 2.
  • the solids content of the aqueous resin solution is between 30 and 80%, preferably 40 and 60%, particularly preferably 55%.
  • the liquid resin can additionally contain suitable wetting agents, hardeners, release agents and defoamers.
  • the liquid resin After applying the aqueous resin solution to the wood-based panel for pre-coating or priming the same, the liquid resin is dried to a moisture content of 10%, preferably 6%, e.g. in a convection oven or near-infrared oven.
  • the wood-based panel can be precoated or primed with 1K / 2K acrylate and / or ESH filler.
  • a UV leveling compound advantageously consists essentially of UV-curable paint components, pigments, reactive thinners and radical initiators as chain starters.
  • the amount of the filler applied can be 50 to 150 g / m 2 , preferably 50 to 100 g / m 2.
  • the quantities given relate to a 100% leveling compound.
  • the filler used for the primer is pigmented, so that the printing result can be varied or improved.
  • Particularly preferred according to the invention is the pre-coating of the wood-based panel with a transparent primer.
  • At least one layer of a pigmented primer which is preferably water-based, is applied to the side of the wood-based panel to be printed.
  • the pigmented primer can either be applied directly to the untreated surface of the material panel or to the previous, preferably transparent, primer.
  • the water-based pigmented primer can also be applied in more than one layer (e.g. 3 to 10 layers, preferably 5 to 8 layers, particularly preferably 7 layers), the pigmented primer being dried in a convection dryer or near-infrared dryer after each layer application .
  • the water-based pigmented primer preferably contains at least one pigment of a light color, particularly preferably at least one white pigment.
  • White pigments are achromatic inorganic pigments with a high refractive index (greater than 1.8). B. plastics are used.
  • White pigments according to the invention can be selected from the group comprising titanium dioxide, lithopone, barium sulfate, zinc oxide, zinc sulfide and calcium sulfate.
  • Lithopone is a white pigment that contains barium sulfate and zinc sulfide.
  • titanium dioxide is preferably used as the white pigment in the water-based pigmented primer, since titanium dioxide has the highest refractive index and thus the highest covering power among the known white pigments.
  • the printing material can therefore be primed before printing and, optionally, one or more protective layers can be applied after printing.
  • a production line comprising the device according to the invention can serve for this purpose.
  • a production line for printing a substrate with the present invention comprises means for generating a primer, the device according to the invention for printing the substrate and, in a further variant, at least one means for applying a protective layer to the substrate provided with the respective print.
  • This means or this device for applying a protective layer is preferably arranged following the printing line.
  • the production line has at least one short-cycle press for pressing the printing material provided with the print pattern and the protective layer arranged thereon.
  • the printing material has a structure.
  • a printing material that has a structure is used with the device according to the invention or with the method according to the invention printed in such a way that the print pattern is synchronous with the structure on the printing material.
  • a printing material that has a wood-like structure can be printed with a wood decor in such a way that the wood decor and the structure underneath are synchronous with one another. This means that where a knothole is shown in the wood decor, there is also a corresponding structuring. For a user, this creates an optimal interplay of structure and decor. This embodiment is therefore very popular with customers and is therefore characterized by a high economic potential.
  • the device can be used to print a 3D structure.
  • powder or fibers are preferably used as the printing medium.
  • cavities into which the printing medium is received are formed on the printing form. Deactivating the magnetic field causes the cavities to recede and the printing medium is transferred to the printing substrate. The printing medium is then dried and / or hardened.
  • the device according to the invention can be used for the metered application of production materials.
  • Production materials are, for example, corundum and / or glass.
  • the cavities on the surface of the cover layer can be formed with any desired shapes and / or depths, they also have correspondingly well-defined scoop volumes. That is to say, with the present invention, cavities can be created which can accommodate a desired volume of a printing medium. This makes it possible to apply a desired amount of a production material to a printing substrate.
  • Figure 1 (A) shows a method for indirect digital printing which is known from the prior art.
  • a printing medium 100 is applied to a roller 20 via a digital printer 10.
  • the roller then transfers the printing medium 100 onto the printing substrate 30.
  • Figure 1 (B) shows a method for the direct printing of a printing material 30 with a printing medium 100 by a digital printer 10. Both methods have the disadvantages of the prior art described at the beginning, which are known to the person skilled in the art for digital printing.
  • a magnetic grid 40 is used, as shown in FIG Figure 2 (A) is shown.
  • the magnetic grid is symbolically connected to a control unit 50 in the form of a computer in order to show that the magnetic grid is regulated via a control unit.
  • the magnetic grid 40 is applied to the pressure body.
  • the pressure body is a pressure roller 20
  • the pressure hull is a pressure plate.
  • FIG. 3 (A) shows a section of a structure of a printing form according to the present invention.
  • a roller 20 to which a magnetic grid 40 is applied serves as the pressure body.
  • Two grid cells 41, 45 of the magnetic grid 40 are shown. These are symbolically connected to a control unit 50 in the form of a computer.
  • the cover layer 42 is located above the grid cells 41, 45.
  • the cover layer 42 has magnetic particles 43 which are distributed in the cover layer 42.
  • a voltage is applied to the raster cell 45, a magnetic field is created which attracts the magnetic particles in the cover layer.
  • the cover layer is deformed in such a way that a cavity 60 is created.
  • Figure 3 (B) likewise shows a section of a structure of a printing form according to the present invention.
  • a magnetic grid 40 of which two grid cells 41, 45 are shown, is in turn applied to a roller 20.
  • the cover layer 42 has, in addition to the magnetic particles 43, regions made of a second material 44.
  • the areas made of the second material 44 had no magnetic particles and are also not magnetizable according to the invention.
  • a voltage is applied to the raster cell 45, a magnetic field is created which attracts the magnetic particles in the cover layer.
  • the cover layer is deformed in such a way that a cavity 60 is created.
  • the regions made of the second material 44 in the cover layer are not deformed according to the invention and contribute to the shaping of the cavity.
  • the areas made of the second material 44 serve to stabilize the cover layer in that webs are formed which support doctoring after a printing medium 100 has been taken up.
  • Figure 3 (C) shows a section of a structure of a printing form according to the present invention, the printing form having a printing plate 26 as a pressure body. The rest of the structure is analogous to Figure 3 (A) .
  • Figure 4 shows the cover layer 42 in a plan view. A plurality of cavities 60 is shown, which in this view have a circular outline.
  • Figure 5 (A) shows three different shapes of cavities 60 which are formed in a cover layer 42.
  • the cover layer 42 is shown in cross section.
  • the present invention can form cavities 60 of various shapes. It is therefore possible to adapt the shape of the cavities to the desired application. The present invention thus offers great flexibility in the printing of printing materials 30.
  • Figure 5 (B) FIG. 10 illustrates the shape of the cavities 60 when the cover layer 42 is viewed from above. All cavities 60 have a circular shape in this view.
  • Figure 5 (C) shows other shapes of cavities that are listed in the following table.
  • the cover layer 42 is shown in cross section.
  • figure Shape of the cavity a Pointed pyramid b Truncated pyramid c Truncated pyramid with steep sides d pointed dome e normal dome f U-shape with steep sides and a wide base
  • Figure 6 (A) to (C) represent three different printing forms, each with a roller 20 serving as a pressure body.
  • the rollers 20 have different diameters.
  • the roller circumference determines the maximum print data length or the repeat that can be used for printing, since the cells are invariably applied to the printing body.
  • the printing form has a sensor which is suitable for determining exactly a position of the circumference of the roller. With the help of the sensor it is then possible to determine exactly at which point on the circumference of the roller it is currently printing. That is, after the cavities 60 have printed, they can be rearranged and formed on the platen.
  • the present invention therefore makes it possible to print digital print patterns on printing materials which have a longer print data than the circumference of the roller.
  • this offers the advantage that the circumference of a printing roller can be selected independently of the print data length or the length of a repeat of a print pattern. It is therefore no longer necessary to provide rollers with different circumferences in production in order to print print samples with different print data lengths.
  • the print data length that can be printed is no longer dependent on the rollers present. Any print data length can be printed with the present invention with a platen. This offers an enormous economic advantage and an enormously increased flexibility compared to conventional gravure printing devices and processes.
  • the printing form in Figure 6 (C) can display the same print data length in seven cycles as the print form in Figure 6 (B) in two rounds. Both printing forms reproduce the same print data length as the printing form in Figure 6 (A) . After completion of the printing process, in all three cases there are substrates that have the same print pattern with the same print data length.
  • Figure 7 represents an example for the execution of a printing process with the present invention.
  • the four printing formes have the rollers 20, 21, 22, 23 as printing bodies.
  • a different print medium is assigned to each roller.
  • Digital separation data are created from a digital print pattern by a control device 50 in the form of a computer.
  • the digital separation data are then transmitted to the rollers 20, 21, 22, 23 and the cavities on the cover layers of the rollers 20, 21, 22, 23 become trained accordingly.
  • the calculation of separation data is based on methods known to the person skilled in the art.
  • Figure 8 represents an embodiment of the invention with a device for data transmission.
  • a device for data transmission For data transmission, all grid points on the magnetic grid 40 are networked 70. In each case a part of the grid points is connected to a contact 72 via an intermediate network 71 with a central network.
  • the contact can be, for example, a slip ring transmitter.
  • a connection to a control device, for example in the form of a computer 50, can be established via the contact.
  • This arrangement makes it possible to exchange data between the control device and the magnetic grid 40 and thus to control the arrangement of the cavities 60.
  • the networking takes place via electronic connections such as cables, circuit boards and / or conductor foils.
  • a roller 20 is shown in two views.
  • FIG. 9 represents a further embodiment of the invention with a device for data transmission.
  • the grid points are networked 70, an intermediate network 71 leading to a central network with a transmitter / receiver device 73 which is suitable for contactless transmission of data.
  • a control device for example in the form of a computer 50, also has a transmitter / receiver device 74 which is suitable for contactless transmission of data.
  • This arrangement makes it possible to exchange data between the control device and the magnetic grid 40 and thus to control the arrangement of the cavities 60.
  • a roller 20 is shown in two views.
  • Figure 10 (A) shows an embodiment of the invention with a device for dispensing a printing medium 100.
  • the printing medium 100 is received from a container 91 by the roller 20 of the printing form dipping into the container 91 and the cavities 60 on the cover layer 42 being completely flooded with printing medium.
  • the doctor blade 25 then removes the excess printing medium 100, so that there is only printing medium 100 in the cavities 60, but the cover layer between the cavities 60 is free of the printing medium.
  • the printing medium 100 is transferred to the rubber roller 80 and from there onto the printing material 30.
  • the control of the printing process is symbolized by a control device in the form of a computer 50.
  • Figure 10 (B) shows a further embodiment of the invention with a device for dispensing a printing medium 100.
  • the printing medium 100 is placed onto the printing form from above, the printing form comprising a roller 20.
  • the excess Printing medium 100 is removed by the doctor blade 25.
  • the printing medium 100 is then transferred to the rubber roller 80 and from there onto the printing material 30.
  • the control of the printing process is symbolized by a control device in the form of a computer 50.
  • FIG. 10 shows a further embodiment of the invention with a device for dispensing a printing medium 100 which comprises ink lines 90 within the printing body.
  • the ink lines 90 advantageously run through the printing body and the magnetic grid 40 and end in the cover layer 42 of the printing form.
  • the ink lines 90 are positioned such that each cavity 60 that is present on the cover layer 42 can be filled with printing medium 100.
  • the cavities 60 are filled from the interior of the pressure body.
  • the ink lines 90 are connected to respective containers that hold print media 100.
  • the cavities 60 can be filled in a targeted manner using suitable pumping and control devices.
  • the containers with the pressure media 100 and the pumping devices are not shown for the sake of clarity.
  • a computer 50 is symbolically depicted as the control device.
  • the printing medium is transferred from the printing form to a rubber roller 80 and from there onto the printing material 30.
  • Figure 11 (B) shows the same structure of a printing form with ink lines 90. In this embodiment, however, the printing material 30 is printed with the printing medium 100 directly by the printing form.
  • Figure 12 (A) to (C) shows different transmission paths of the printing medium 100 on a printing substrate 30 in the printing process with the method according to the invention.
  • Figure 12 (A) shows an indirect transfer of the printing medium 100 from the printing form via a rubber roller 80 to the printing material 30.
  • Figure 12 (B) represents a direct printing method using the method according to the invention.
  • the printing medium 100 is transferred directly to the printing material 30 through the printing form.
  • Figure 12 (C) shows a printing process with a printing form which has a roller 20 as a pressure body.
  • a printing medium 100 is applied to the printing form, and the printing medium 100 is applied to a flexible transfer element 83.
  • the flexible transfer element 83 is guided over a deflection roller 81 and then the print pattern is transferred to the printing material 30. This is done with a movable Counterpressure roller 82, the flexible transfer element 83 is pressed against the printing material 100.
  • the movable counterpressure roller 82 can adapt to the structuring of the printing material 30 in such a way that there is a sufficiently high contact pressure at all times during the transfer of the printing medium 100 to the printing material 30.
  • the contact pressure is sufficiently high if an error-free transfer of the printing medium 100 is guaranteed.
  • the movable counterpressure roller 82 additionally has an elastic coating such that the flexible transfer element 83 is at least partially pressed into structures on the surface of the printing material 30, so that error-free transfer of the printing medium 100 is ensured.
  • Figure 13 shows the printing of a substrate 30 with a device according to the invention.
  • the device comprises a pressure plate 26 as a pressure body.
  • An impression roller 95 presses the printing material 30 onto the device according to the invention, so that the printing medium 100 can be transferred to the printing material 30.
  • the digital separation data were transferred from a digital print pattern, which represents a print decoration, to four printing forms, each printing form receiving a separate printing color.
  • Each printing form had a roller as the pressure body.
  • the cavities 60 were formed on the cover layer 42 of the rollers 20, 21, 22, 23 in accordance with the digital separation data.
  • the cavities 60 of the rollers 20, 21, 22, 23 were each filled with paint via a container and the cover layer 42 was then cleaned with a doctor blade 25.
  • the colors were printed one after the other directly onto a pre-primed wood-based panel.
  • the digital separation data were transferred from a digital print pattern, which represents a print decoration, to four printing forms, each printing form receiving a separate printing color.
  • Each printing form had a roller 20, 21, 22, 23 as the printing body.
  • the cavities 60 were formed on the cover layer 42 of the rollers 20, 21, 22, 23 in accordance with the digital separation data.
  • the cavities 60 of the rollers 20, 21, 22, 23 were each filled with paint via a container and the cover layer 42 was then cleaned with a doctor blade 25.
  • the ink was transferred from the printing forme to a rubber roller 80, from which it was printed onto a pre-primed wood-based panel. In this way, all the colors were applied one after the other.
  • the digital separation data were transferred from a digital print pattern, which represents a print decoration, to four printing forms, each printing form receiving a separate printing color.
  • Each printing form had a plate 26 as the printing body.
  • the cavities 60 were filled with paint by means of an application roller and the surface of the cover layer 42 was then cleaned with a doctor blade 25.
  • the print sample was printed directly on a pre-primed wood-based panel.
  • a primer was applied to a printing base paper with a weight of 70 g / m 2 and then the printing base paper was printed with a digital print pattern in the form of a decoration according to embodiments 1 and 2 and then further processed as follows:
  • the decorated paper layers were impregnated with aqueous melamine resin. After drying, the paper layers were cut and stacked as a laminate for pressing. For the production of a laminate, various layers were stacked as described below.
  • a resin-impregnated paper layer was first applied as a counterweight to the underside of a carrier board, which in this exemplary embodiment was a chipboard.
  • the impregnated, decorated paper layer was applied to the top of the carrier plate and a so-called overlay was applied to it.
  • a resin-impregnated transparent paper layer equipped with hard material particles was used as the overlay.
  • the stack was driven into a short-cycle press and pressed into laminate under the action of heat and pressure.
  • a structured press plate was used on the top side in the short-cycle press so that a structure was created on the surface of the laminate.
  • the structure produced is at least partially synchronous with the decoration of the paper layer.
  • the digital separation data were transferred from a digital print pattern, which represents a print decoration, to four printing forms, each printing form receiving a separate printing color.
  • Each printing form had a roller 20, 21, 22, 23 as the printing body.
  • the cavities 60 were formed on the cover layer 42 of the rollers 20, 21, 22, 23 in accordance with the digital separation data.
  • the cavities 60 of the rollers 20, 21, 22, 23 were each filled with paint via a container and the cover layer 42 was then cleaned with a doctor blade 25.
  • the ink was transferred from the printing form to a flexible transfer element 83.
  • the flexible transfer element 83 was deflected via a deflection roller 81 and then the flexible transfer element 83 was pressed by a movable counter-pressure roller 82 against a structured, pre-primed wood-based panel. This printing process was carried out for all colors in sequence.
  • the pre-primed wood-based panel was thus provided with the printed decoration in such a way that the printed decoration is essentially synchronous with the structure of the wood-based panel.
  • Wood-based panels were printed after the application of a primer according to embodiments 1 to 3 and processed further as follows: The printed HDF panels were separated in front of the production line and transported through the downstream production facility at a speed of 40 m / min.
  • a first roller application unit approx. 70 g of melamine resin fluid (solids content: 55% by weight) containing the usual auxiliaries (hardener, wetting agent, etc.) are applied to the panel surface.
  • a melamine resin is also applied to the underside of the plate with the first roller application unit (application quantity: 60 g resin liquid / m 2 , solids content: approx. 55% by weight).
  • a melamine resin layer (solids content: 55% by weight) is then applied in an amount of 25 g / m 2 . This also contains the usual auxiliaries.
  • a melamine resin is also applied to the underside of the plate using a roller application unit (application quantity: 50 g resin fluid / m 2 , solids content: approx. 55% by weight). The plate is dried in a circulating air dryer.
  • a melamine resin which also contains glass beads, is then applied to the surface of the board. These have a diameter of 60 - 80 ⁇ m. The amount of resin applied is approx. 20 g melamine resin liquid / m 2 (solids content: 61.5% by weight). In addition to the hardener and wetting agent, the recipe also contains a release agent. The amount of glass spheres applied is approx. 3 g / m 2 .
  • a melamine resin is also applied to the underside of the plate using a roller application unit (application quantity: 40 g resin liquid area / m 2 , solids content: approx. 55% by weight). The plate is again dried in a circulating air dryer and then coated again with a melamine resin containing glass beads.
  • Vivapur 302 Cellulose (Vivapur 302) is included as a further component. Again, about 20 g of melamine resin liquid / m 2 (solids content: 61.6% by weight) are applied. Again, about 3 g of glass spheres and 0.25 g of cellulose / m 2 are applied. In addition to the hardener and wetting agent, the recipes also contain a release agent. A melamine resin is also applied to the underside of the board with a roller application unit (application quantity: 30 g resin fl. / M 2 , Solids content: approx. 55% by weight). The resin is again dried in a circulating air dryer and then the plate is pressed in a short-cycle press at 200 ° C. and a pressure of 400 N / cm 2. The pressing time was 10 seconds. A pressed sheet with a wooden structure was used as a structure generator.
  • the amount of resin varies per roller application in the range from 5 g / m 2 to about 100 g / m 2 ; the solids content of the resin can also vary in the range from 50% by weight to about 80% by weight.
  • the amount of corundum varies between 2 g / m 2 to 30 g / m 2 .
  • the additives glass and corundum also vary in their respective amounts.
  • the digital separation data were transferred from a digital print pattern, which represents a print decoration, to four printing forms, each printing form receiving a separate printing color.
  • Each printing form had a roller 20, 21, 22, 23 as the printing body.
  • the Cavities 60 were formed on the cover layer 42 of the rollers 20, 21, 22, 23 in accordance with the digital separation data.
  • the cavities 60 of the rollers 20, 21, 22, 23 were each filled with paint via a container 81 and the cover layer 42 was then cleaned with a doctor blade 25.
  • the colors were printed one after the other directly onto a pre-primed wood-based panel.
  • the circumference of the rollers 20, 21, 22, 23 of the printing forms was 70 cm, but the print data length of the print pattern was 140 cm.
  • the position of the cavities 60 of each roller 20, 21, 22, 23, which had already printed, was therefore rearranged immediately after the printing process. The arrangement was made such that the entire print pattern could be printed with two revolutions of the rollers 20, 21, 22, 23.
  • An ink or a powder with electrically conductive particles is used as the printing medium.
  • a functional layer is applied to the printing material as an electrically conductive form; for this purpose, the base bodies are laid out in rows.
  • the application quantity of the printing medium is in the range of 3-50 g pigment per m 2 .
  • the functional layer is then dried and / or hardened.
  • a powder or fibers are taken up as a pressure medium by means of the device according to the invention.
  • the cavities recede and release the powder or fibers onto the printing material.
  • the printed layer is then dried and / or cured.
  • a UV lacquer is picked up and applied to a printing material.
  • the UV lacquer is applied to the printing material at positions where a structure is desired, for example in areas on which a decoration is depicted on the printing material, which, among other things, represents wood pores.
  • the structure printed by the device according to the invention is essentially congruent with the pore structure.
  • the device according to the invention takes up a production material such as corundum or glass as a printing medium.
  • a precisely defined amount of the printing medium is absorbed, which is determined by the shape of the cavities that are formed.
  • the cavities can be designed with variable shapes and also variable depths, and thus a defined volume. This makes it possible to dose the order quantity of a print medium and to make a fully automatic adjustment to recipes for the order quantity of production materials.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
EP20170576.1A 2020-04-21 2020-04-21 Dispositif de génération d'une impression sur une matière d'impression et procédé de génération d'une pluralité de cavités sur une forme d'impression dotée d'une matrice magnétique Active EP3900934B1 (fr)

Priority Applications (1)

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EP20170576.1A EP3900934B1 (fr) 2020-04-21 2020-04-21 Dispositif de génération d'une impression sur une matière d'impression et procédé de génération d'une pluralité de cavités sur une forme d'impression dotée d'une matrice magnétique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20170576.1A EP3900934B1 (fr) 2020-04-21 2020-04-21 Dispositif de génération d'une impression sur une matière d'impression et procédé de génération d'une pluralité de cavités sur une forme d'impression dotée d'une matrice magnétique

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EP3900934B1 EP3900934B1 (fr) 2022-05-18

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5040617B1 (fr) * 1970-03-24 1975-12-25
EP0363932A2 (fr) * 1988-10-14 1990-04-18 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Forme d'impression
EP0522804A1 (fr) * 1991-07-08 1993-01-13 Rockwell International Corporation Système d'image à impression directe pour l'impression lithographique
EP2636531A1 (fr) 2012-03-06 2013-09-11 Flooring Technologies Ltd. Procédé d'impression de la surface d'une pièce usinée
EP3020565A1 (fr) * 2014-11-14 2016-05-18 Flooring Technologies Ltd. Procédé de création d'au moins un décor imprimé destiné à être utilisé dans au moins deux procédés d'impression distincts et un dispositif d'exécution de ce procédé
EP2181852B1 (fr) 2006-06-26 2019-08-07 Dante Frati Ligne de production pour la fabrication de panneaux plats à base de bois avec une surface supérieure imprimée

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5040617B1 (fr) * 1970-03-24 1975-12-25
EP0363932A2 (fr) * 1988-10-14 1990-04-18 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Forme d'impression
EP0522804A1 (fr) * 1991-07-08 1993-01-13 Rockwell International Corporation Système d'image à impression directe pour l'impression lithographique
EP2181852B1 (fr) 2006-06-26 2019-08-07 Dante Frati Ligne de production pour la fabrication de panneaux plats à base de bois avec une surface supérieure imprimée
EP2636531A1 (fr) 2012-03-06 2013-09-11 Flooring Technologies Ltd. Procédé d'impression de la surface d'une pièce usinée
EP3020565A1 (fr) * 2014-11-14 2016-05-18 Flooring Technologies Ltd. Procédé de création d'au moins un décor imprimé destiné à être utilisé dans au moins deux procédés d'impression distincts et un dispositif d'exécution de ce procédé

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