WO2021013679A1 - Procédé de production d'une structure sur une surface - Google Patents

Procédé de production d'une structure sur une surface Download PDF

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Publication number
WO2021013679A1
WO2021013679A1 PCT/EP2020/070113 EP2020070113W WO2021013679A1 WO 2021013679 A1 WO2021013679 A1 WO 2021013679A1 EP 2020070113 W EP2020070113 W EP 2020070113W WO 2021013679 A1 WO2021013679 A1 WO 2021013679A1
Authority
WO
WIPO (PCT)
Prior art keywords
transfer film
fine structure
flat workpiece
workpiece
coating
Prior art date
Application number
PCT/EP2020/070113
Other languages
German (de)
English (en)
Inventor
Stefan Hörnicke
Original Assignee
Achilles Veredelt Nord Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from EP19187327.2A external-priority patent/EP3766703A1/fr
Priority claimed from EP20177147.4A external-priority patent/EP3915802A1/fr
Application filed by Achilles Veredelt Nord Gmbh filed Critical Achilles Veredelt Nord Gmbh
Priority to EP20739403.2A priority Critical patent/EP3999358B1/fr
Publication of WO2021013679A1 publication Critical patent/WO2021013679A1/fr

Links

Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a method for the produc- tion of a structure on a surface of a flat, in particular rigid workpiece, in particular a furniture part, a cladding part, a structural part, a floor element, a component or the like.
  • Structured surfaces are widely used, for example, in the furniture industry and in the construction industry, for example for finishing kitchen fronts, furniture panels and building materials.
  • surface finishing especially with a replica of a structure, is common nowadays.
  • These replicas of structures can be simulated wood pores, simulated stone surfaces or fantasy structures.
  • There are various processes for producing these surface structures that are tailored to the coating process for the surface. Different embossing matrices are used, which are pressed into the surface by pressing melamine, for example, or a structure that is painted onto the surface.
  • a paper that has been printed with a wood look is impregnated with a melamine resin, dried and then pressed onto a chipboard in a heating press with an embossing plate.
  • the embossing plate results in structures with a depth of about 20 gm to 150 gm.
  • EP 3 109 056 B1 finally describes a method for producing a structure on a surface, in which, in a first step, the surface of a workpiece to be coated is coated with a liquid base layer and in a second step a structure is created in this still liquid base layer with the help of sprayed-on liquid droplets, which is later fixed.
  • This method is also comparatively complex and requires elaborately manufactured tools.
  • CA 2 709 564 A1 An approach known from the prior art for producing actually finer structures is known from CA 2 709 564 A1, which, however, relates to a method for applying holograms to flexible substrates, ie lottery tickets.
  • the flexible substrate is provided with a layer of lacquer.
  • a film with a microstructure is applied to the lacquer layer. After a curing process using UV light, in which the paint layer hardens, the film is removed.
  • This document describes the application of fine structures to flexible substrates in a printing machine with inline printing and coating units and an integrated perforating station, which is not suitable for finishing workpieces such as furniture, cladding parts and the like.
  • WO 2019/0185832 A1 describes an embossing die referred to as a master film web, by means of which fine structures are embossed into a further film web.
  • the master film web is provided on a transfer surface with a master lacquer layer in which negative forms of the structures to be transferred are formed.
  • the master film web and the film web to which the structures are to be transferred run through a pressure roller-pressure roller arrangement and are pressed against one another, whereby the structure of the master film web is transferred to the film web.
  • the film web Before the embossing process, the film web is provided with a layer of lacquer on its surface. The structure is later embossed into the applied lacquer layer by means of the master film web and cured by means of UV light. To produce the master film web, a film web is also provided with a layer of lacquer. The film web then runs through an embossing calender in which the structure is embossed into the film web. The lacquer coating is cured using UV light.
  • a major disadvantage of this method is in particular that the foil web is first coated with a curable varnish, which is then embossed and cured. With this approach, there is basically the risk of the structure in the lacquer layer ripping off or flowing away, which considerably impairs the precision of the fine structure. Nor can it be guaranteed that the lacquer layer on the film web is always constant for the embossing process. It has been shown that there is also considerable potential for cost savings compared to this multi-level embossing approach.
  • EP 2 025 413 A2 relates to a method for producing a surface on a flat workpiece, in which the workpiece is first powder-coated. A structured film-like transfer medium is then pressed against the uncured powder coating and the powder coating is cured. To produce the structured Transmission medium, it is proposed that the film-like transmission medium first be provided with a coating. The desired structure is then mechanically embossed into the lacquer layer and the lacquer layer is cured by irradiation.
  • curable lacquer for foil stamping which can lead to the fine structure being plucked out or flowing.
  • the object of the present invention is to provide a method for producing a structure on a surface of a workpiece , in which existing tools can be used in conventional production systems and which is sufficiently flexible so that when a structure is changed, the respective tool (the roller or the press plate) does not have to be changed.
  • the method according to the invention should also offer the possibility of producing nanostructures (e.g. holographic surfaces) on the workpiece surface with high accuracy and cost-effectiveness.
  • the method according to the invention for producing a structure on a surface of a flat workpiece comprises the following steps:
  • a transfer film with a fine structure is produced by embossing a fine structure with a profile depth of 100 nm to 150 gm into the transfer film using a structured cylinder or a structured sleeve, the surface of the transfer film being free of a curable lacquer coating and the fine structure is embossed into the transfer film thermally or by means of ultrasound,
  • a structured transfer film is applied to the surface coated in (b) before the coating hardens, so that the structure is in contact with the coated surface of the flat workpiece,
  • the transfer film is removed from the cured, coated surface, so that a copied structure is left on the target surface.
  • a structure is generated on the workpiece surface by means of a transfer film, on the surface of which there is an original fine structure.
  • a structured surface is to be understood as a three-dimensional structure.
  • neither a powder-coated substrate is used, nor is the fine structure introduced into the absorbent film using a lacquer coating.
  • lacquers to the transfer film can be dispensed with in the context of the process according to the invention, which brings considerable advantages from an economic point of view.
  • additives such as paints
  • the fine structure is introduced into the transfer film exclusively by thermal embossing or by means of ultrasonic embossing of the transfer film, without additional substances for structuring being applied to the transfer film prior to the embossing process.
  • a further embodiment of the invention provides that the structured cylinder or the structured sleeve for embossing the transfer film is seamless.
  • a seamless or seamlessly structured sleeve is shaped, for example, in the manner of a sleeve and has a seamless, in particular continuously smooth surface structure into which the embossed structure is molded.
  • the embossed structure can also be made seamless, ie the embossed structure also has no seams or the like, but is molded directly into the structured sleeve or the structured cylinder.
  • a seamless textured cylinder or a seamless textured one Sleeves can effectively create a seamless structure on the surface of a workpiece.
  • the invention is particularly aimed at providing workpieces of a rigid nature with a structured surface.
  • the workpiece is therefore preferably a rigid workpiece or a rigid substrate.
  • a rigid workpiece is understood to mean in particular one which has a high degree of rigidity and dimensional stability, so that it is not bent or deformed in actual parlance or when used generically, ie is dimensionally stable. This includes in particular kitchen fronts, furniture panels and building materials, but also floor panels, indoor and outdoor cladding, industrial panels and the like.
  • flexible workpieces i.e. flexible substrates, can also be provided with a structured surface within the scope of the invention.
  • the workpiece is a furniture part, a cladding part, a structural part, a floor element, a component or the like.
  • the structured transfer film is made of a material that is suitable for this purpose, for example of thermoplastic plastic.
  • the structured transfer sheet used in the method can be made as part of the process of manufacturing the fine structure of the target surface, or a transfer sheet that has been previously made or procured elsewhere that has the desired original fine structure can be used in the method.
  • the surface can basically be any surface of a workpiece, such as a wooden surface, a plastic surface, a metal surface or a layered paper surface on a particularly otherwise rigid workpiece.
  • the target surface can be flat or curved (sheet or roll goods).
  • the coating can be a lacquer, a paint or another curable coating.
  • Acrylic lacquers are preferred. Lacquers that are UV-curable are very particularly preferred.
  • the selected transfer film is placed on the target surface in such a way that its original fine structure touches the target surface while the coating has not yet hardened. After the coating has cured, the transfer film is removed from the surface of the workpiece.
  • the mate rial of the transfer film which adheres to the target surface, creates a copied fine structure that is a mirror image of the original fine structure of the transfer film.
  • the height of the copied fine structure generated on the target surface is preferably slightly smaller in the direction of the normal to the target surface than the height of the original fine structure.
  • surface structures with a profile depth of, for example, 100 nm to 500 nm, preferably 100 nm to 200 nm, more preferably 120 nm to 150 nm can be produced without the structures ripping out or flowing.
  • haptic structures can also be produced which preferably have a profile depth of 10 ⁇ m to 150 ⁇ m without the need to use special profiled rollers.
  • a wide variety of functional surface structures such as lotus blossom effects, moth eye effects or shark skin effects, light deflection effects, retroreflection, backlight effects with a profile depth of 100 nm to 50 ⁇ m, preferably 350 nm to 20 ⁇ m, can be generated on the flat workpieces with the method according to the invention.
  • the structured transfer films can be transparent or opaque, in particular if the lacquer underneath can be cured by irradiation, such as by UV irradiation.
  • a further embodiment of the invention provides that in step (b) the surface of the flat workpiece is provided with a coating and that in step (d) the coating is cured in contact with the transfer film by means of radiation, preferably UV radiation.
  • the irradiation preferably takes place through the transfer film from the side of the transfer film facing away from the workpiece.
  • the material of the transfer film can be acetyl cellulose or paper.
  • Another embodiment of the invention provides that the material of the transfer film is cellulose diacetate or cellulose triacetate.
  • Another embodiment of the invention provides that a fine structure is generated in a surface of a flat workpiece which has a height in the direction of the normal to the target surface of 100 nm to 500 nm, preferably 100 nm to 200 nm, more preferably 120 nm to 150 nm nm.
  • Another embodiment of the invention provides that a fine structure is produced in the surface of a flat workpiece, which creates a holographic optical effect.
  • the transfer film with a fine structure is used on both sides, in that it is applied in a second pass of the method to a further flat workpiece with the opposite side of the previous pass, whereby the front and back of the transfer film can comprise different fine structures .
  • care must be taken that the depth of the fine structures on both sides of the transfer film and the film thickness of the transfer film are selected such that the fine structures are spaced apart in a direction perpendicular to the film surface, ie in the film thickness direction.
  • first one side of the transfer film can be embossed and then the transfer film can be rolled up onto a roll.
  • the transfer film can be unrolled again from the roll and brought back into contact with the surface of the embossing cylinder or embossing sleeve.
  • an additional deflection roller can be provided over which the transfer film runs. This deflection roller is arranged in such a way that the transfer film is turned before it comes into contact again with the surface of the embossing cylinder or the embossing sleeve in order to form the second embossing.
  • the transfer foil is removed from the workpiece after the first pass, turned and placed with the other side on a prepared workpiece in order to shape the second fine structure into the workpiece.
  • the fine structure with a profile depth of 100 nm to 150 mpi is embossed into the transfer film using a structured cylinder or a structured sleeve.
  • the transfer film is first coated with a curable lacquer, which is then embossed and cured, because with such a procedure there would be the risk of the structure ripping off or flowing.
  • the transfer film can have more layers.
  • the cylinders or sleeves for embossing the transfer film can be made of nickel, copper or chrome, for example. Exemplary methods for imparting the structured surface on the cylinders or sleeves include electron beam lithography, laser technology, such as the use of pico or nano lasers and engraving, chemical or plasma etching.
  • the structure is transferred to the film by thermal embossing or ultrasonic embossing.
  • Thermal embossing can be done with a roll-to-roll printing machine or by static embossing.
  • thermal structure embossing or hot embossing is understood to mean a method in which a prefabricated structure on a stamp, i.e. in the context of the invention on the structured cylinder or the structured sleeve, is transferred to the transfer film to be embossed under the influence of heat.
  • the structure embossing of the substrate is preferably carried out in the context of the invention in the roll-to-roll process at embossing surface temperatures of 50 ° to 130 ° C.
  • the structured transfer films can be transparent or opaque, in particular if the lacquer underneath can be cured by exposure to radiation, such as by UV radiation, as will be explained later.
  • the material of the transfer film can be selected, for example, from polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyester, polycarbonate, cellophane.
  • Other synthetic materials such as bio-based plastics, for example polycactide, cellulose acetates and starch blends, can also be used as the material of the transfer film.
  • Preferred plastics are cellulose acetates, such as cellulose diacetate or cellulose triacetate.
  • Composite materials of different foils or foil / paper are also suitable for the transfer foils.
  • the connection of two materials to produce a composite material can be done, for example, by gluing using dispersion, LF or LH adhesives, co-extrusion or ultrasound.
  • the film thickness of the transfer film is preferably 10 ⁇ m to 250 ⁇ m. Most preferred is a film thickness between 50 ⁇ m and 90 ⁇ m so that the transfer film has an advantageous stiffness and yet sufficient balance between flexibility and stiffness to be used in the inventive method .
  • the structured transfer film can also have a thermoreactive adhesive layer, for example made of EVA / PE.
  • Foil thicknesses between 60 ⁇ m and 80 ⁇ m are preferred for structuring furniture surfaces.
  • Foil widths can be from 10 mm to 2500 mm. Foil widths of 800 mm to 2100 mm are provided for structuring furniture surfaces.
  • the structured transfer foils can be applied to the upper surface of a flat workpiece, for example with commercially available calander coating inert machines, as is practiced, for example, in the furniture industry for the production of high-gloss surfaces.
  • calander coating inert machines are for example from the company Hymmen GmbH (Hamm, Germany) and Cefla sc (Imola, Italy en) available.
  • UV lacquers are applied in a rolling process. Then a film or tape smooths the still liquid paint surface. The curing takes place through the film by means of UV radiation with direct surface contact. Then the film is removed from the upper surface. It is not necessary to adapt the calendar coating inert machines.
  • the flat workpiece as a format or rolled goods can be chipboard, MDF boards (for example for furniture), HDF boards, raw chipboard, veneer, floors, interior and exterior cladding and / or cement fiber boards, but also aircraft, automobile and railroad parts.
  • the invention provides for functional structures to be transferred to aircraft wings and tail units with the aid of the method according to the invention, so that, for example, their air flow (shark skin) is favorably influenced, a self-cleaning effect (lotus blossoms) or an anti-reflective coating (moth's eye effect) is achieved.
  • test marks such as holograms or hidden security features based on micro or nano scripts or images, which can facilitate the identification of counterfeit products.
  • the method according to the invention can also be used to produce decorative optical or haptic effects on the surfaces of the workpieces.
  • the coating applied to the surface of the flat workpiece is preferably a thermally and / or UV-curing lacquer or a thermally and / or UV-curing paint. If a UV-curing lacquer is used, the film is preferably transparent, so that curing with UV light is facilitated.
  • Conventional varnishes or paints based on polyacrylate or those based on alkyd resins are preferred.
  • the paints or paints can be those with or without electrical conductivity.
  • the conductivity can be produced, for example, by mixing with polyanilline in the paint composition. Polyaniline is a polymer with excellent electrical conductivity that has an anti-corrosive effect due to its passivation. If biodegradability is desired, varnishes based on vegetable oils can also be used. In principle, there are no limits to the use of certain paints in the process according to the invention.

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  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

La présente invention concerne un procédé de production d'une surface structurée sur une pièce à usiner plane, dans lequel des outils présents dans des installations de production courantes peuvent être utilisés, et qui est suffisamment flexible pour que lors du changement d'une structure il ne soit pas nécessaire de changer l'outil respectif (le rouleau ou la tôle de pressage). Le procédé selon l'invention offre en pus la possibilité de générer des nanostructures et des microstructures sur la surface de pièce à usiner. Dans le procédé, une surface de la pièce à usiner plane est peint, une feuille de transfert comprenant une structure fine est appliquée sur la surface peinte avant le durcissement de la peinture, de sorte que la structure fine est en contact avec la surface peinte de la pièce à usiner plane, la peinture de la surface peinte durcit ou est durcie en contact avec la feuille de transfert et la feuille de transfert est retirée de la surface peinte durcie, de sorte qu'une structure copiée soit laissée sur la surface cible.
PCT/EP2020/070113 2019-07-19 2020-07-16 Procédé de production d'une structure sur une surface WO2021013679A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20739403.2A EP3999358B1 (fr) 2019-07-19 2020-07-16 Procédé de fabrication d'une structure sur une surface

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP19187327.2A EP3766703A1 (fr) 2019-07-19 2019-07-19 Procédé de fabrication d'une structure sur une surface
EP19187327.2 2019-07-19
EP20177147.4 2020-05-28
EP20177147.4A EP3915802A1 (fr) 2020-05-28 2020-05-28 Procédé d'impression par gaufrage de substrats au moyen de la technologie sleeve

Publications (1)

Publication Number Publication Date
WO2021013679A1 true WO2021013679A1 (fr) 2021-01-28

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Application Number Title Priority Date Filing Date
PCT/EP2020/070113 WO2021013679A1 (fr) 2019-07-19 2020-07-16 Procédé de production d'une structure sur une surface

Country Status (2)

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EP (1) EP3999358B1 (fr)
WO (1) WO2021013679A1 (fr)

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0113823A1 (fr) * 1982-12-21 1984-07-25 Kurt Held Procédé de fabrication par pressage de produits stratifiés à surface texturée et dispositif pour l'exécution de ce procédé
JPH0478535B2 (fr) 1983-02-18 1992-12-11 Iedee Ootomateru Ab
EP1690602A1 (fr) * 2005-02-09 2006-08-16 Fritz Egger GmbH & Co. Procédé et appareil pour réaliser un revêtement à surface structurée et object ayant un tel revêtement structuré
DE202008001067U1 (de) * 2007-01-24 2008-09-04 WINKLER+DüNNEBIER AG Magnetwalze zum Schneiden und/oder Prägen von Materialbahnen oder -zuschnitten
DE102007019871A1 (de) 2007-04-25 2008-10-09 Theodor Hymmen Holding Gmbh Verfahren und Vorrichtung zur Erzeugung einer dünnen dreidimensional strukturierten Oberfläche auf plattenförmigen Werkstoffen
EP2025413A2 (fr) 2007-08-15 2009-02-18 S.D. Warren Company Revêtements de poudre et procédé de formation de revêtements de poudre
DE102009044802A1 (de) 2009-11-30 2011-12-15 Theodor Hymmen Holding Gmbh Verfahren und Vorrichtung zur Erzeugung einer dreidimensionalen Oberflächenstruktur auf einem Werkstück
CA2709564A1 (fr) 2010-07-23 2012-01-23 Pollard Banknote Limited Partnership Billet de loterie a aspect holographique
DE202017005883U1 (de) * 2017-11-10 2017-12-13 Sächsische Walzengravur GmbH Einrichtung zur Umformung einer Werkstückoberfläche mit einem rotierenden Werkzeug in Form einer Walze
EP3109056B1 (fr) 2015-06-25 2018-02-14 Hymmen GmbH Maschinen- und Anlagenbau Procede et dispositif de fabrication d'une structure sur une surface
WO2019185832A1 (fr) 2018-03-28 2019-10-03 Basf Coatings Gmbh Procédé pour transférer une structure en relief sur la surface d'un moyen de revêtement et composite pouvant servir de matrice d'impression en relief
EP3680085A1 (fr) * 2019-01-11 2020-07-15 Trespa International B.V. Procédé de fabrication d'une décoration

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0113823A1 (fr) * 1982-12-21 1984-07-25 Kurt Held Procédé de fabrication par pressage de produits stratifiés à surface texturée et dispositif pour l'exécution de ce procédé
JPH0478535B2 (fr) 1983-02-18 1992-12-11 Iedee Ootomateru Ab
EP1690602A1 (fr) * 2005-02-09 2006-08-16 Fritz Egger GmbH & Co. Procédé et appareil pour réaliser un revêtement à surface structurée et object ayant un tel revêtement structuré
DE202008001067U1 (de) * 2007-01-24 2008-09-04 WINKLER+DüNNEBIER AG Magnetwalze zum Schneiden und/oder Prägen von Materialbahnen oder -zuschnitten
DE102007019871A1 (de) 2007-04-25 2008-10-09 Theodor Hymmen Holding Gmbh Verfahren und Vorrichtung zur Erzeugung einer dünnen dreidimensional strukturierten Oberfläche auf plattenförmigen Werkstoffen
EP2025413A2 (fr) 2007-08-15 2009-02-18 S.D. Warren Company Revêtements de poudre et procédé de formation de revêtements de poudre
DE102009044802A1 (de) 2009-11-30 2011-12-15 Theodor Hymmen Holding Gmbh Verfahren und Vorrichtung zur Erzeugung einer dreidimensionalen Oberflächenstruktur auf einem Werkstück
CA2709564A1 (fr) 2010-07-23 2012-01-23 Pollard Banknote Limited Partnership Billet de loterie a aspect holographique
EP3109056B1 (fr) 2015-06-25 2018-02-14 Hymmen GmbH Maschinen- und Anlagenbau Procede et dispositif de fabrication d'une structure sur une surface
DE202017005883U1 (de) * 2017-11-10 2017-12-13 Sächsische Walzengravur GmbH Einrichtung zur Umformung einer Werkstückoberfläche mit einem rotierenden Werkzeug in Form einer Walze
WO2019185832A1 (fr) 2018-03-28 2019-10-03 Basf Coatings Gmbh Procédé pour transférer une structure en relief sur la surface d'un moyen de revêtement et composite pouvant servir de matrice d'impression en relief
EP3680085A1 (fr) * 2019-01-11 2020-07-15 Trespa International B.V. Procédé de fabrication d'une décoration

Non-Patent Citations (1)

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Title
LINFA PENG ET AL: "Micro hot embossing of thermoplastic polymers: a review", JOURNAL OF MICROMECHANICS AND MICROENGINEERING, INSTITUTE OF PHYSICS PUBLISHING, BRISTOL, GB, vol. 24, no. 1, 12 December 2013 (2013-12-12), pages 13001, XP020255912, ISSN: 0960-1317, [retrieved on 20131212], DOI: 10.1088/0960-1317/24/1/013001 *

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Publication number Publication date
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