EP2977158B1 - Traitement d'une surface d'un panneau de particules - Google Patents

Traitement d'une surface d'un panneau de particules Download PDF

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Publication number
EP2977158B1
EP2977158B1 EP15174245.9A EP15174245A EP2977158B1 EP 2977158 B1 EP2977158 B1 EP 2977158B1 EP 15174245 A EP15174245 A EP 15174245A EP 2977158 B1 EP2977158 B1 EP 2977158B1
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EP
European Patent Office
Prior art keywords
mixture
wood
curable mixture
workpiece
semi
Prior art date
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Active
Application number
EP15174245.9A
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German (de)
English (en)
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EP2977158A1 (fr
Inventor
Marcus Fritz
Gotthilf Sturm
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.)
Homag GmbH
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Homag GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N7/00—After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity
    • B27N7/005—Coating boards, e.g. with a finishing or decorating layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/002—Manufacture of substantially flat articles, e.g. boards, from particles or fibres characterised by the type of binder

Definitions

  • the present invention relates to a method for tempering a surface of a chipboard, and a corresponding device. Such a method and such a device are used in the construction element and furniture industry.
  • Chipboard In the component and furniture industry, chipboard is being used to an increasing extent in order to achieve a further reduction in production costs. Chipboard is usually produced in presses. For further processing of the chipboard, which is delivered as a semi-finished product in defined sizes, these are divided to a certain size. Before the actual surface refinement, in particular the application of a coating / edge material in narrow surface areas, they are then machined again true to size.
  • chipboard has the disadvantage that the narrow sides of the workpieces, in the area of which the core layer of the chipboard is exposed, are relatively porous and possibly also have comparatively large pores.
  • chipboard In order to be able to further process chipboard with a view to quality requirements, for example to attach an edge material to a narrow surface of such a chipboard, it is therefore necessary to "smooth" the narrow surface of the workpiece, i.e. to close the open pores of the core layer of the chipboard.
  • the hot melt adhesive has the disadvantage that the surface produced is relatively flexible and machining to create a defined geometry with cutting tools leads to difficulties.
  • the hot melt adhesive may have the disadvantage that, if the hot melt adhesive is not removed, it forms an elastic body between the core layer and the coating material.
  • UV varnish An alternative process is therefore the use of UV varnish.
  • the surface treated in this way can be machined after the UV lacquer has cured.
  • the UV varnish is relatively expensive, so that its use is rather uneconomical, especially when chipboard is used as a comparatively inexpensive material.
  • UV hotmelt adhesive which, like the UV varnish, can be machined after it has been applied and hardened.
  • the raw material of the UV hot melt adhesive is also very expensive and means that the UV hot melt adhesive did not achieve an economic breakthrough.
  • a surface treatment agent with a film-forming plastic composition and filler elements.
  • a surface treatment agent is provided in liquid form which, in addition to a film-forming plastic composition, contains wood flour as filler.
  • the wood meal is provided in a range of 40-80% by volume.
  • UV curing, heat curing, or acid curing is preferred.
  • the plastic composition to be formed is a non-liquid, but highly viscous liquid.
  • Another document is the DE 1 295 180 A1 to name a process for the production of chipboard with at least one fine top layer by creating a fleece from wood chips and resin binder with subsequent hardening under pressure and coating the fleece (before or after hardening) with a mixture of solid resin and lignocellulosic particles as well as hardening the coated fleece under pressure.
  • the present invention aims to provide a method and a device with which a chipboard can be tempered prior to further processing, in particular the application of a coating material.
  • the method and the device should be able to be implemented cost-effectively and enable an improved environmental balance.
  • the area of application of the present invention is in particular the area of the core layer exposed on the narrow sides of the chipboard.
  • the invention is not limited to such an application. Sections other than the narrow sides may also have pores and should nevertheless be provided with a high quality coating material so that the coating according to the invention can also be used in these areas.
  • a "material produced” during processing of a semifinished product is mixed with a binder to form a hardenable mass.
  • a semi-finished product in the furniture and construction element sector is preferably a chipboard, an HDF board, an MDF board, a composite board, a lightweight board with a honeycomb structure, a plywood element or a laminate workpiece.
  • it can be a door element with a composite structure.
  • the "accruing material” includes, purely by way of example, wood chips or grains, such as those produced during milling or grinding of a chipboard.
  • the Material proportions vary: In addition to wood-based proportions, chipboard also contains other additives that can also find their way into the "accumulating material”.
  • the above-mentioned "material” that arises when processing a semi-finished product can be used in the further processing of such semi-finished products.
  • the workpiece with the surface to be tempered is a chipboard. This enables materials to be recycled (accruing material) that may otherwise be disposed of, in particular for the same or similar types of workpiece that are already used to recover the accruing material.
  • the material obtained when processing a semi-finished product preferably wood chips or dust
  • the resulting material can be prepared for use as a filler, so that the surface to be coated achieves excellent surface properties.
  • the surface is machined after the mixture has hardened. This can be done with a milling cutter or a grinding jig. In this way, the surface of the surface provided with the hardenable mixture is improved again.
  • the method is characterized in that a lacquer that can be machined is applied to the surface, the application preferably taking place after the mixture has hardened. This variant thus provides a further compensation step.
  • the hardenable mixture applied to the surface can be shaped with a shaping device before hardening. In this way, the hardenable mixture is pressed even further into pores of the surface of the workpiece, or additional smoothing is achieved.
  • the binding agent is an adhesive, in particular a wood glue.
  • the adhesive is PVAc (polyvinyl acetate), a two-component adhesive or an adhesive based on a bio-polymer.
  • An extrudable wood material for example using PP or PE, can also be used as a binding agent.
  • the mixture is cured by means of electromagnetic radiation, in particular by means of microwave, laser radiation, IR radiation, plasma or hot air. In this way, rapid further processing of the surface provided with the hardenable mixture is possible.
  • the present invention also relates to a device for performing the method according to one of the aforementioned aspects, which device comprises the features of claim 9.
  • the device is equipped with a processing device for processing the material resulting from the processing of a semi-finished product, in particular for adapting the chip or grain size of the material produced by grinding, comminuting and / or sieving.
  • the device further comprises a post-processing device for machining post-processing, the surface provided with the hardenable mixture, around the with to further anneal the surface provided with the hardenable mixture.
  • the device can be equipped with a shaping device for shaping the applied mixture.
  • the hardenable mixture is optionally pressed even further into pores of the surface of the workpiece or the created surface is additionally smoothed.
  • the shaping device is a sliding shoe.
  • a device for applying a machinable lacquer to the surface is a further optional component within the scope of the invention, it being possible for the device to be provided separately from the application device.
  • Particle boards are usually produced in presses in relatively large formats of, for example, 5 x 2.5 m. Such chipboards are semi-finished products that are split up for further processing. Before the actual surface finishing, for example applying a Coating material, the panel blanks are processed again true to size. This dimensionally accurate processing is also known as formatting (see step S1 in Fig. 1 ).
  • step S2 The material produced during the processing of the chipboard, in particular chips and other materials contained in chipboard (hereinafter also referred to as "produced material"), are processed within the scope of the present embodiment (step S2), in particular brought / crushed to a defined maximum grain size, for example ground, separated or chopped, and / or sieved.
  • a defined maximum grain size for example ground, separated or chopped, and / or sieved.
  • ingredients can also be filtered out, since in the case of chipboard and when using the material obtained when dividing the chipboard, higher proportions of wood may be desired.
  • the material is ground and placed in a water bath so that the wood grains float on the surface of the water while heavier materials sink into the water.
  • the processing can include the admixing of additives, for example in order to make the (wood) material that has accumulated more flexible.
  • the material produced and possibly processed in the manner described above can, in a further embodiment, be mixed with further wood material, for example wood flour or further wood shavings.
  • further wood material for example wood flour or further wood shavings.
  • This material is mixed with an adhesive or adhesive, in particular PVAC (step S2), in such a way that the wood-based material takes up 50% by volume, in particular 70% by volume, particularly preferably 80% by volume or more, as the base material .
  • the material mixed with the adhesive is also referred to below as a "curable mixture”.
  • the hardenable mixture is then pressed through a nozzle by means of pumps, for example by means of screw pumps, and applied to the narrow surface of a chipboard (step S4). If necessary, the mixture pressed on in this way, which at least partially penetrates the pores of the chipboard, is shaped by means of a shoe or a doctor blade.
  • the curable mixture is then dried or cured (step S5). If, for example, PVAC glue is used as the adhesive for the curable mixture, it can be cured relatively quickly by means of a microwave energy source. Air drying is also possible after the hardenable mixture has been activated.
  • step S6 the surface of the chipboard treated with the hardenable mixture, in particular the narrow side, is machined again and brought into a defined, dimensionally stable shape.
  • the rapid hardening of the hardenable mixture creates pores in its structure.
  • a further layer can be applied after the application of the hardenable mixture and, if necessary, machining.
  • Conventional finishing materials can also be used, such as UV lacquer, UV hot melt adhesive or hot melt adhesive.
  • a coating material is now applied to the coated surface (step S7).
  • the present invention thus has the advantage that a comparatively inexpensive filler (curable mixture) is provided for the increasingly used chipboard with, in some cases, relatively large pores. This leads to possible cost savings while improving the surface quality of a narrow surface of the particularly porous plates.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Claims (13)

  1. Procédé de traitement d'une surface d'une pièce, dans lequel la pièce avec la surface à traiter est un panneau de particules, avec les étapes :
    de fourniture d'un matériau résultant d'un usinage d'un produit semi-fini, de préférence un matériau de bois, en particulier des copeaux ou de la poussière de bois,
    de mélange du matériau résultant avec un agent liant en un mélange durcissable,
    d'application du mélange durcissable sur la surface de la pièce à traiter, et
    au moins partiellement de durcissement du mélange,
    dans lequel la surface est réusinée par enlèvement de copeaux après le durcissement du mélange durcissable.
  2. Procédé selon la revendication 1, caractérisé en ce que le matériau résultant d'un usinage d'un produit semi-fini est préparé avant le mélange à l'agent liant, en particulier broyé, concassé et/ou tamisé pour ajuster la taille des copeaux ou des grains.
  3. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le réusinage par enlèvement de copeaux est réalisé avec une fraise ou un dispositif de meulage.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le produit semi-fini est un panneau de particules, un panneau HDF, un panneau MDF, un panneau composite, un panneau de construction léger avec structure alvéolaire, un élément de contreplaqué ou une pièce stratifiée.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une laque usinable par enlèvement de copeaux, en particulier une laque UV, ou un adhésif thermofusible UV, est appliquée sur la surface, ou un matériau de laminage, de préférence en papier ou un bord mince, ou un film plastique est appliqué, dans lequel l'application a lieu de préférence après le durcissement du mélange durcissable.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le mélange durcissable appliqué sur la surface est mis en forme par un appareil de mise en forme avant le durcissement.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'agent liant est un adhésif, de préférence du PVAc, en particulier une colle à bois, un adhésif à deux composants, un biopolymère avec un additif ou un matériau à bois extrudable.
  8. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le mélange est durci au moyen de rayonnement électromagnétique, en particulier au moyen de micro-ondes, de rayonnement laser, de rayonnement IR, de plasma ou d'air chaud.
  9. Dispositif pour la réalisation du procédé selon l'une quelconque des revendications précédentes, avec
    un appareil de stockage pour recevoir un matériau résultant d'un usinage d'un produit semi-fini, de préférence un matériau de bois, en particulier des copeaux ou de la poussière de bois,
    un appareil de mélange pour mélanger le matériau résultant avec un agent liant en un mélange durcissable,
    un appareil d'application pour appliquer le mélange durcissable sur une surface de la pièce à traiter,
    un appareil de durcissement pour durcir au moins partiellement le mélange appliqué, et
    un appareil de réusinage pour réusiner par enlèvement de copeaux la surface pourvue du mélange durcissable.
  10. Dispositif selon la revendication 9, en outre avec un appareil de préparation pour préparer le matériau résultant de l'usinage du produit semi-fini, en particulier pour ajuster la taille des copeaux ou des grains du matériau résultant par broyage, concassage et/ou tamisage.
  11. Dispositif selon l'une quelconque des revendications 9 à 10, dans lequel l'appareil de réusinage est prévu pour le fraisage ou le meulage de la surface pourvue du mélange durcissable.
  12. Dispositif selon l'une quelconque des revendications 9 à 11, en outre avec un appareil de mise en forme pour la mise en forme du mélange appliqué.
  13. Dispositif selon l'une quelconque des revendications 9 à 12, en outre avec un appareil pour l'application d'une laque usinable par enlèvement de copeaux sur la surface, en particulier une laque UV, ou un adhésif thermofusible UV, ou un matériau de laminage, de préférence en papier ou un bord mince.
EP15174245.9A 2014-07-25 2015-06-29 Traitement d'une surface d'un panneau de particules Active EP2977158B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014214686.0A DE102014214686A1 (de) 2014-07-25 2014-07-25 Vergüten einer Werkstückfläche

Publications (2)

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EP2977158A1 EP2977158A1 (fr) 2016-01-27
EP2977158B1 true EP2977158B1 (fr) 2021-04-21

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EP15174245.9A Active EP2977158B1 (fr) 2014-07-25 2015-06-29 Traitement d'une surface d'un panneau de particules

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DE (1) DE102014214686A1 (fr)

Cited By (1)

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DE102024120618A1 (de) * 2024-07-19 2026-01-22 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Herstellung eines Interieurbauteils, ein solches Interieurbauteil sowie ein Fahrzeug

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BE1028906B1 (nl) * 2020-12-15 2022-07-19 Dovy Keukens Nv Werkwijze voor het met lak afwerken van een substraat en substraat hierdoor verkregen
AT526970B1 (de) * 2023-02-20 2025-01-15 Scheucher Holzindustrie Gmbh Verfahren zur Herstellung eines Verbundwerkstoffs

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Publication number Priority date Publication date Assignee Title
DE102024120618A1 (de) * 2024-07-19 2026-01-22 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Herstellung eines Interieurbauteils, ein solches Interieurbauteil sowie ein Fahrzeug

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EP2977158A1 (fr) 2016-01-27
DE102014214686A1 (de) 2016-01-28

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