EP3539792B1 - Procédé de fabrication de structures sur un substrat - Google Patents

Procédé de fabrication de structures sur un substrat Download PDF

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Publication number
EP3539792B1
EP3539792B1 EP18162046.9A EP18162046A EP3539792B1 EP 3539792 B1 EP3539792 B1 EP 3539792B1 EP 18162046 A EP18162046 A EP 18162046A EP 3539792 B1 EP3539792 B1 EP 3539792B1
Authority
EP
European Patent Office
Prior art keywords
substrate
decoration
film
providing film
optimized
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18162046.9A
Other languages
German (de)
English (en)
Other versions
EP3539792A1 (fr
Inventor
Pius Steinmann
Vito Monteleone
Oliver Grossmann
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.)
Swiss Krono Tec AG
Original Assignee
Swiss Krono Tec AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Swiss Krono Tec AG filed Critical Swiss Krono Tec AG
Priority to EP18162046.9A priority Critical patent/EP3539792B1/fr
Priority to ES18162046T priority patent/ES2894945T3/es
Priority to PT18162046T priority patent/PT3539792T/pt
Priority to PL18162046T priority patent/PL3539792T3/pl
Publication of EP3539792A1 publication Critical patent/EP3539792A1/fr
Application granted granted Critical
Publication of EP3539792B1 publication Critical patent/EP3539792B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
    • B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
    • B44B5/02—Dies; Accessories
    • B44B5/026—Dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/24—Pressing or stamping ornamental designs on surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C3/00—Processes, not specifically provided for elsewhere, for producing ornamental structures
    • B44C3/02—Superimposing layers
    • B44C3/025—Superimposing layers to produce ornamental relief structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C5/00—Processes for producing special ornamental bodies
    • B44C5/04—Ornamental plaques, e.g. decorative panels, decorative veneers

Definitions

  • the invention relates to a method for producing structures on a substrate.
  • the production of structures on a substrate in particular on paper or wood material surfaces, is known per se.
  • the EP 2 179 863 A1 the decorating, but also the structuring of a substrate by means of a structuring foil. This process is well suited for small quantities, but the cost of the structure generator film is too high for mass products.
  • US 2009/151866 A1 discloses a method for producing a structure on a substrate, wherein a decoration is printed on a substrate, and a corresponding three-dimensional structure is produced on a test press plate. Then the printed substrate is embossed with the test press plate. If the print decoration and the structure do not match, a new test press plate is produced and tested.
  • WO 2014/014400 A1 discloses a method whereby a three-dimensional structure is printed onto a film with curable ink. The film provided with the structure is then fed to a press, where the pressure side of the structured film is pressed against a decorated substrate in order to emboss the structure in the substrate surface.
  • the object of the invention is to propose a flexible method for producing structures on a substrate that is suitable for both small and large quantities.
  • the structure to be transferred to the substrate can first be transferred to the substrate quickly and inexpensively by means of a structure donor foil.
  • the structure can be optimized if necessary, details are explained below.
  • patterns or smaller orders for the substrate can be created quickly, easily and at low cost by means of structure donor foil.
  • the fast and inexpensive production of patterns allows z. B. to check customers or sales staff, decor and structure and also check or test suggestions for improvement until the desired optimum is achieved.
  • the optimized structure is transferred to a press plate and transferred from the press plate to the substrate.
  • the more economical press plate preferably a press plate made of stainless steel, is used for larger quantities.
  • the risk of the structure not being able to fit the first time the press sheet is produced is eliminated by the described lead time.
  • the file in which the optimized structure is saved is used to manufacture the press plate. This ensures that the optimized structure is also used reliably for the production of large quantities of a substrate that is provided with a decoration and a structure.
  • press plates are only produced if the structure is actually in demand and it is certain that there is sufficient demand to justify the production of an expensive press plate. In this way, not only are costs better allocated and thus reduced overall, but there are also fewer press plates in the warehouse, which simplifies storage.
  • the decor and structure are advantageously matched to one another, especially in the case of decors and structures that imitate natural materials such as wood or stone.
  • the structure can be optimized, in particular to match the decor.
  • the optimization takes place if the structure does not yet meet the requirements by changing the structure, either directly on the computer by editing the file or by editing the printed structure and rescanning it, then saving it as a new file and then producing a new structuring film with the changed structure.
  • This changed structure is then printed again on a substrate provided with the associated decoration and assessed again. If necessary, the optimization steps are repeated.
  • the decoration on the substrate can also be optimized by either changing the decoration on the computer by editing the file or rescanning a printed decoration and saving it as a new file in order to then print it on the substrate to become. Printing is preferably done with digital printers, e.g. B. laser or inkjet printers.
  • the structuring film is produced by printing, preferably by using a structure-giving medium, e.g. B. ink, pigments or particles can be applied to a film by means of a printer.
  • the structure-giving medium can preferably be used in a digital application device, e.g. B. a 3D printer, a laser printer or an inkjet printer.
  • the medium can be processed as a solid or in liquid form.
  • the structure-giving medium is preferably applied in solid or liquid form by means of a digital printer, in particular an inkjet printer, a laser printer, a 2-D or 3-D printer. The medium is applied to the structuring foil and bound there.
  • the medium is applied not only as a layer on the surface of the structure generator film, but as an elevation that protrudes beyond the surface of the film.
  • this creates a three-dimensional structure that, depending on the type of medium used, still has to dry, set or harden, e.g. B. by exposure to temperature or radiation such as laser or UV light or electron beams.
  • the structure applied to the embossing side of the structuring foil is sufficiently strong to emboss the surface of a substrate.
  • the height of the structure can preferably be from 1 ⁇ m to 1000 ⁇ m. It can vary in order to reproduce a given model in great detail.
  • the minimum height results from the minimum application amount of the structure-giving medium that the application device can at least process, the maximum application amount results from the maximum embossing that can be made in the surface of the substrate. For example, repeating patterns or individual images (silhouettes of people, objects or areas such as city silhouettes), but also replicas of natural objects such as. B. wood grain, bark replicas or images of plants can be applied as a structure to the structuring foil.
  • the structure is usually applied to the structure generator film on the basis of a digital data record. It is advantageous that, for example, in the case of lifelike reproductions of wood grains, the same digital data set that is used to produce the structure can also be used to create a decorative film, e.g. B. to print a paper film or a plastic film with a two-dimensional decor in color. After or before the creation of the decoration, the corresponding structure is printed raised on the film with the identical data record. In this way, substrates can be made uniform, e.g. B. a decorative film or a decorative paper can be laminated onto the substrate, then either the decorative film or a further coating that is applied to the decorative film can be provided with a three-dimensional structure by means of the structuring film.
  • a foil for single use or a reusable foil can be produced. This means that samples, individual orders and small series can be produced economically.
  • a high-resolution structure can be generated.
  • details of the structure can be applied in a resolution of 25 dpi to 4800 dpi.
  • the structure-giving medium can be applied very differently and finely distributed in different thicknesses to the print side of the structure-forming film.
  • the three-dimensional structure that is generated on the print side of the structure generator film can be applied with different thicknesses, based on the surface of the print side, from approx. 1 ⁇ m to approx. 1000 ⁇ m, so that pronounced relief-like structures can be applied, which are mostly tactile on the surface of the substrate.
  • the structuring film can be selected from a variety of materials.
  • the structuring film can, for. B. made of metal, in particular aluminum. It can also be made of plastic, paper, cardboard or a composite material. It can have one or more layers. If the structuring film is made of plastic, it preferably has one or a combination of the plastics listed below: polyethylene, high-density polyethylene, polypropylene, polyethylene terephthalate, polyurethane, thermoplastic polyurethane, polyacetate, polycarbonate, polyimide, polystyrene, polyvinyl chloride or polytetrafluoroethylene. Mixtures of the aforementioned materials can also be used to produce the structure generator film, e.g. B. Mixtures of different plastics or layers of different materials.
  • the structure generator film can also have a coating, e.g. B. a varnish or a primer.
  • the coating can, for example, improve the adhesion of the structure-imparting medium to the structure donor film or it can influence the surface properties of the structure donor film, e.g. B. enable a matt or high-gloss surface.
  • At least the print side of the structure generator film can have a matt or glossy to high gloss surface. Accordingly, the print side creates a matt or glossy or high-gloss surface on the substrate.
  • a solid or liquid medium is e.g. B. applied by a 3D printer, a laser printer or an inkjet printer on the print side of a film, which becomes the structure generator film.
  • the structure-giving medium is inextricably linked to the printing side of the film, so that it remains completely adhered to the printing side during the embossing and also during the removal of the structure-giving film from the substrate.
  • This can e.g. B. happen that the structure-giving medium adheres to the print side by drying, for example by evaporating water or solvent.
  • the medium can harden if, for. B.
  • a medium processed by a 3D printer is applied in the form of solid particles and z.
  • the structure applied to the print side which is shown as a negative after the embossing in the surface of the substrate, can either be a self-contained motif, but it can also reproduce a motif several times or it can only reproduce part of a motif.
  • z. B. wood structures or other natural structures such as B. Stone structures shown.
  • any other motifs such as B. logos, skylines or the like can be produced.
  • further information is applied to the print side regardless of the motif, e.g. B. print marks or other information that relate to the alignment of the structure generator film with respect to the substrate or a press in which the structure generator film and the substrate are pressed in order to transfer the structure to the surface of the substrate.
  • This information can also, since it is transferred to the surface of the substrate, be used for later processing steps of the substrate, e.g. B. to provide information on dividing the substrate into individual parts.
  • This additional information can also be applied by the digital application device or it can be applied by other application devices.
  • the application of a structure to the surface of a substrate comprises the steps of providing a substrate with a surface and of providing a structure generator film with a print side, onto which at least in sections a structure is applied giving medium that forms a structure.
  • the method further comprises placing the print side of the structure donor film on the surface of the substrate and pressing the substrate and structure donor film in a press, the structure applied to the print side of the structure donor film being impressed on the surface of the substrate, since in the Press smooth, non-structured press plates are used.
  • the structure-giving medium applied to the printing side of the structure generator film thus comes into direct contact with the surface of the substrate in order to produce a negative of the structure applied to the printing side there.
  • the surface of the substrate is embossed in a relief-like manner and thus likewise shows a structure.
  • the pressure of the press is required to emboss the structure into the surface of the substrate.
  • the pressure is usually from 10 N / mm 2 to 1000 N / mm 2 .
  • an increased temperature is also used so that the surface of the substrate can be more easily deformed.
  • the temperature is e.g. B. from 40 ° C to 300 ° C, preferably from 140 ° C to 200 ° C.
  • the pressure is applied by a press, usually a short-cycle press (KT press) or by a continuous press.
  • a press duration of a maximum of 150 seconds is sufficient, usually 10 seconds to 30 seconds are sufficient, at least a press duration of 5 seconds is sufficient to depict the structure on the print side of the structure generator film as a negative, and thus also as a structure on the surface of the substrate .
  • the pressing conditions are selected depending on the substrate to be embossed. The expert determines the optimal pressing conditions with a few preliminary experiments.
  • All materials that can be embossed by the structuring foil are suitable as the substrate, typically wood or wood-based materials, plastics, in particular thermoplastic plastics, metals, in particular metal foils, but also ceramic materials. Wood fiber or chipboard, plywood, laminated wood and OSB boards are among the wood-based materials that are referred to as wood-based materials in the context of the invention.
  • the materials can also be used as an intermediate product, e.g. B. before or during drying, pressing or curing, if they are in are in a manufacturing state in which they are still soft enough to be embossed.
  • the materials can also be heated or temporarily softened in some other way in order to enable the surface to be embossed.
  • the substrate has a surface coating which is embossed by the structure donor film.
  • This surface coating which then forms the surface of the substrate, can preferably consist of a lacquer or a synthetic resin. Lacquer or synthetic resin can advantageously be highly viscous or dried, but not yet hardened. Also gelled paints, e.g. B. UV or radiation-curing lacquers can be easily embossed through the structure donor film, so that the surface coating as a structure shows an exact and detailed negative of the structure applied to the print side of the structure donor film.
  • Typical synthetic resin coatings can be well suited as a surface coating of a substrate in order to be pressed with the structuring foil according to the invention, in particular if the press is operated at a pressing temperature of approx. 140 ° C to approx. 200 ° C.
  • the synthetic resin is preferably used as a precondensed or dried but not yet cured surface coating, e.g. B. used by wood-based panels. It liquefies in the press at the temperatures mentioned. In this state it can be embossed through the structuring foil. In the further course of the pressing process, the synthetic resin hardens at the temperatures mentioned, so that a permanent structure can be embossed into the surface.
  • Typical synthetic resins are melamine resin, phenol-formaldehyde resin and urea resins.
  • lacquers can also be used without further ado. Frequently used lacquers are acrylate- or methacrylate-based lacquers, polyurethane lacquers, epoxy lacquers, or water-based lacquers. UV- or radiation-curing lacquers and thermosetting lacquers are preferably used because these lacquers can be gelled (partially cured) in a precisely tailored match to the structure donor film according to the invention, so that after the pressing process an optimal reproduction of the structure of the structure donor film is reproduced in the lacquer surface, e.g. . B. because the paint is not more dissipates. The paint can be completely cured during or after the pressing process.
  • the file with the possibly optimized structure is used according to the invention to produce a press plate and that Press plate structured in this way is used in the press instead of a non-structured press plate.
  • the conditions for pressing are usually the same as for embossing the structure with a structuring foil.
  • Fig. 1 a flow chart of the method according to the invention
  • the inventive method begins to present a decor provided with a structure, for. B. a wood or stone surface or an artificially designed surface.
  • the decor and then the structure are then scanned and stored in separate files.
  • the resolution can range from 25 dpi (dots per inch) to 4800 dpi.
  • the decoration is applied to the substrate according to the data stored in the respective file, e.g. B. a decorative paper or the surface of a wood-based panel, in particular a wood-based panel with a synthetic resin layer applied to it, printed.
  • a digital printer e.g. B. a laser printer or an inkjet printer is used.
  • the structure saved in the respective file is printed on a structuring foil.
  • the structuring film is made of a plastic, here PET (polyethylene terephthalate). However, it can be made from a wide range of materials, including various plastics, metal, paper, or cardboard Includes composite materials. Suitable plastics are listed in the general description.
  • the structure is applied to the structure generator film by means of a digital printer, e.g. B.
  • a laser or inkjet printer that prints structures in a layer thickness of 1 ⁇ m to 1000 ⁇ m on the PET film.
  • the ink or another medium applied by means of the printer adheres firmly to the film and has a density that is suitable for embossing a substrate with a decoration applied to it.
  • the structure is then embossed onto the substrate provided with the decoration by means of the structure generator film.
  • a stack of pressed material consisting of the substrate, which is provided with a decoration, and the structure generator film is introduced into the press.
  • the substrate is an 8 mm fibreboard and the decor is applied as a synthetic resin-impregnated decor paper on a top side of the fibreboard.
  • the stack of pressed material is pressed between smooth, non-structured press plates.
  • the embossing is preferably carried out in a short-cycle press (KT press). In the simplest case, only the pressure of the press is required to emboss the structure into the surface of the substrate.
  • the pressure is usually from 10 N / mm 2 to 1000 N / mm 2 .
  • an increased temperature is also used so that the surface of the substrate can be more easily deformed.
  • the temperature is usually in a range from 40.degree. C. to 300.degree. C., preferably from 140.degree. C. to 200.degree. C., in the present case 160.degree.
  • the decor and the structure - as in the present exemplary embodiment - are matched to one another, then after a first pressing of the structure onto the decor it is to be checked whether the structure and the decor are optimally matched to one another. In addition, it must be checked whether the structure that was originally removed from the original is also optimal in the pressed version or whether there is still a need for optimization, e.g. B. in the coloring, in the precision of the coordination with the decor or the arrangement and execution of the structure with regard to the depth of the embossing. The same goes for the decor. Even if the decor seemed well suited as a template, the finished pressed version should be checked to see whether there is any need for further optimization, e.g. B. in the adaptation of the color scheme, the improvement of shading or the sharpness of the contours.
  • the files for the structure and the decor are revised and adapted according to the need for optimization if the changes can be made directly to the file using a computer. If not, a printout of the structure and / or the decor is printed out, edited and scanned again so that a modified file is available in each case.
  • the structure is printed out again on a structure generator film according to the adapted file and pressed onto a substrate with decoration as described above. If the decor has also been adapted, the adapted decor is also printed on the substrate beforehand so that it can be checked whether the changed version of the structure and, if applicable, the decor match one another. This process can be repeated until the result is satisfactorily optimized. It is obvious that the production of a structuring foil is quick and uncomplicated and much cheaper in relation to even small test press plates of approx. 50 cm x 50 cm.
  • Test prints and small individual orders can be produced using the structuring foil alone.
  • larger quantities of substrates provided with a structure can be produced more economically by using a structured press plate.
  • the optimized file is used to produce a structured press sheet so that large quantities of a substrate provided with a structure can also be produced economically.
  • structured press plates are only produced if it is actually economical, whereas previously it had to be speculated whether the production of a certain structured press plate is economically viable.
  • stocking structured press plates is much easier because only those press plates are produced that are actually required for the production of large quantities of structured substrates.

Landscapes

  • Laminated Bodies (AREA)
  • Printing Methods (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Claims (9)

  1. Procédé de fabrication de structures sur un substrat, comprenant les étapes suivantes :
    mise à disposition d'un décor pourvu de la structure,
    scannage du décor et de la structure et enregistrement du décor et de la structure dans des fichiers séparés, suivi de la fabrication de structures sur un substrat en deux étapes, dans lequel
    dans une première étape :
    le décor est imprimé sur un substrat,
    la structure tridimensionnelle est imprimée sur la face d'impression d'une feuille structurante, une structure étant appliquée sous la forme de bosse, laquelle fait saillie sur la surface de la feuille structurante,
    la structure est gaufrée au moyen de la face d'impression de la feuille structurante sur un substrat pourvu du décor,
    le cas échéant, la structure est optimisée et la structure est de nouveau imprimée sur une feuille structurante et gaufrée au moyen de la face d'impression de la feuille structurante sur un substrat pourvu du décor, et dans lequel
    dans une deuxième étape :
    la structure optimisée le cas échéant est transférée sur une tôle emboutie à l'aide du fichier avec la structure optimisée le cas échéant pour la fabrication d'une tôle emboutie, et dans lequel,
    après introduction de la tôle emboutie ainsi structurée dans une presse, la structure optimisée le cas échéant est gaufrée à partir de la tôle emboutie sur le substrat décoré par fermeture de la presse.
  2. Procédé selon la revendication 1, caractérisé en ce que la structure sur la face d'impression de la feuille structurante présente une hauteur de 1 µm à 1000 µm, par rapport à la face d'impression.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la structure présente une résolution de 25 dpi à 4800 dpi.
  4. Procédé selon l'une au moins des revendications précédentes, caractérisé en ce que la feuille structurante est fabriquée en métal, plastique, papier, carton ou un matériau composite.
  5. Procédé selon la revendication 4, caractérisé en ce qu'une feuille structurante est utilisée qui présente de l'aluminium, du polyéthylène, du polyéthylène à haute densité, du polypropylène, du polyéthylène téréphtalate, du polyuréthane, du polyuréthane thermoplastique, du polyacétate, du polycarbonate, du polyimide, du polystyrène, du chlorure de polyvinyle ou du polytétrafluoréthylène ou une combinaison de ces matériaux.
  6. Procédé selon l'une au moins des revendications précédentes, caractérisé en ce que la feuille structurante présente une face d'impression matte, brillante ou hautement brillante.
  7. Procédé selon l'une au moins des revendications précédentes, caractérisé en ce qu'une tôle d'acier inoxydable est utilisée en tant que tôle emboutie.
  8. Procédé selon l'une au moins des revendications précédentes, caractérisé en ce que l'optimisation est effectuée plusieurs fois, en réalisant la structure par traitement du fichier ou en traitant et en scannant de nouveau la structure imprimée, celle-ci étant alors enregistrée en tant que nouveau fichier.
  9. Procédé selon l'une au moins des revendications précédentes, caractérisé en ce que le décor est optimisé.
EP18162046.9A 2018-03-15 2018-03-15 Procédé de fabrication de structures sur un substrat Active EP3539792B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP18162046.9A EP3539792B1 (fr) 2018-03-15 2018-03-15 Procédé de fabrication de structures sur un substrat
ES18162046T ES2894945T3 (es) 2018-03-15 2018-03-15 Procedimiento de producción de estructuras sobre un sustrato
PT18162046T PT3539792T (pt) 2018-03-15 2018-03-15 Método para o fabrico de estruturas num substrato
PL18162046T PL3539792T3 (pl) 2018-03-15 2018-03-15 Sposób produkcji struktur na podłożu

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18162046.9A EP3539792B1 (fr) 2018-03-15 2018-03-15 Procédé de fabrication de structures sur un substrat

Publications (2)

Publication Number Publication Date
EP3539792A1 EP3539792A1 (fr) 2019-09-18
EP3539792B1 true EP3539792B1 (fr) 2021-08-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP18162046.9A Active EP3539792B1 (fr) 2018-03-15 2018-03-15 Procédé de fabrication de structures sur un substrat

Country Status (4)

Country Link
EP (1) EP3539792B1 (fr)
ES (1) ES2894945T3 (fr)
PL (1) PL3539792T3 (fr)
PT (1) PT3539792T (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4271573A1 (fr) * 2020-12-29 2023-11-08 Giorgio Macor Procédé permettant de munir une pièce d'un revêtement de surface à texture tridimensionnelle
IT202100031211A1 (it) * 2021-12-13 2023-06-13 Gruppo Mastrotto S P A Metodo per la riproduzione seriale di disegni in rilievo su materiali laminari flessibili

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0620712D0 (en) * 2006-10-18 2006-11-29 Flotek Internat Ltd Method of embssing a substrate
US7947139B2 (en) * 2007-12-14 2011-05-24 Kings Mountain International, Inc. Systems and methods for creating textured laminates
ES2391421T3 (es) 2008-10-27 2012-11-26 Flooring Technologies Ltd. Procedimiento para realizar el acabado de una placa de soporte, en particular de una placa de madera o de compuesto de madera
EP2213476A1 (fr) * 2009-01-30 2010-08-04 Spanolux N.V.- DIV. Balterio Procédé de fabrication d'un panneau stratifié, appareil et panneau stratifié
WO2014014400A1 (fr) * 2012-07-17 2014-01-23 Floor Iptech Ab Feuille supplémentaire

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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Also Published As

Publication number Publication date
PL3539792T3 (pl) 2022-01-03
EP3539792A1 (fr) 2019-09-18
ES2894945T3 (es) 2022-02-16
PT3539792T (pt) 2021-10-26

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