EP4069482B1 - Dispositif et procédé pour couvrir une surface de piece de travail - Google Patents

Dispositif et procédé pour couvrir une surface de piece de travail Download PDF

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Publication number
EP4069482B1
EP4069482B1 EP20820132.7A EP20820132A EP4069482B1 EP 4069482 B1 EP4069482 B1 EP 4069482B1 EP 20820132 A EP20820132 A EP 20820132A EP 4069482 B1 EP4069482 B1 EP 4069482B1
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EP
European Patent Office
Prior art keywords
pretreatment
workpiece
printing
detection
heads
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EP20820132.7A
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German (de)
English (en)
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EP4069482A1 (fr
Inventor
Sergej Schwarz
Johannes Schmid
Achim Homeier
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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
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D5/00—Other working of veneer or plywood specially adapted to veneer or plywood
    • B27D5/003—Other working of veneer or plywood specially adapted to veneer or plywood securing a veneer strip to a panel edge

Definitions

  • the invention relates to a device and a method for coating a surface of a workpiece, in particular a narrow side of a plate-shaped workpiece.
  • a device and such a method are known from the document WO 02/00449 A1 known.
  • edge band In many cases, narrow sides of panel-shaped workpieces made of wood or wood-based materials are closed with a so-called edge band.
  • the edge band can be, for example, a veneer strip or a strip made of a plastic material.
  • Such a procedure is particularly necessary when the panel-shaped workpiece is a chipboard or generally a workpiece with a core layer that needs to be protected or concealed for optical reasons and that has relatively open-pored structures on the narrow side.
  • Conventional edge bands have a defined width. An edge band with a certain width is therefore used for a workpiece with a corresponding thickness. In order to increase variability, edge bands with different widths and in different patterns are therefore used. However, this leads to increased logistical effort.
  • the EP 1 726 443 A1 which describes a device and a method for patterning the narrow side of plate-shaped workpieces.
  • the device comprises a stationary printing unit with at least one inkjet print head, a conveyor device and a detection device for detecting the dimensions and/or the position of the narrow side to be patterned.
  • This device avoids having to make new adjustments each time the component dimensions change. Instead, for example, components with a wide variety of dimensions can be patterned in continuous operation without stopping the device.
  • the device in question results in improved pattern quality.
  • the individual detection of each individual workpiece ensures that only the narrow sides are actually patterned, and not, for example, the top or bottom sides of the workpieces.
  • the document EN 10 2015 219 108 A1 known which relates to a method for narrow side coating on, in particular, plate-shaped workpieces, with the steps: bringing about a relative movement between a workpiece and an application unit, which application unit is provided for applying a mass, setting an application area for applying the mass, in particular depending on the width of the narrow side of a workpiece to be provided with the mass, and applying the mass to a narrow side of the workpiece to form a three-dimensional body.
  • the invention aims to provide a device and a method for coating a surface of a workpiece, in particular a narrow side of a workpiece, with high quality, whereby a high degree of variability is to be achieved.
  • the invention provides a corresponding device. Further embodiments are listed in the dependent claims.
  • the invention also relates to a method according to claim 10. Features of the method and further embodiments thereof can be used within the scope of the device. The same applies to features of the device and its preferred developments that can be used within the scope of the method.
  • the device according to the invention is suitable for coating a surface of a workpiece.
  • the surface is preferably a narrow side of a plate-shaped workpiece.
  • the device comprises: at least one pretreatment device for pretreating a surface to be coated, a device for bringing about a relative movement between the pretreatment device and the workpiece, and at least one printing device, in particular an inkjet printing device, wherein the printing device comprises at least one digital print head.
  • the print head can be designed as an inkjet print head. It is further provided that the pretreatment device is set up to apply a pretreatment material to the surface of the workpiece to be printed.
  • the device further comprises a detection device for detecting a property of the surface to be coated. Furthermore, a control device of the device is set up to control and/or regulate the pretreatment device and/or the printing device on the basis of the detection result of the detection device. In this way, intelligent monitoring can be provided to a certain extent, which in the case of regulation provides a self-adjusting system.
  • the detection device has a first detection module that is arranged and set up to detect the surface to be coated before pretreatment.
  • the first detection module is thus arranged in the direction of flow before the pretreatment module. Differences in the bulk density and/or porosity of the surface to be coated can be determined using the first detection module. This information can be used to specifically influence the pretreatment.
  • the detection device comprises a second detection module which is arranged and set up to detect the surface to be coated after pretreatment.
  • the second detection module is arranged after the pretreatment module in the direction of flow.
  • the invention has particular advantages in that the coating of a workpiece can be carried out with high variability and quality of the surface. Furthermore, the logistics associated with coating narrow sides are simplified and thus production costs are reduced. In addition, the user of the device/method is given the opportunity to influence the design and quality of the coating of the workpiece.
  • the pretreatment device is designed to apply a lacquer, a Hot melt adhesive, a two-component material or a thermoplastic material.
  • the pretreatment material e.g. paint, hot melt adhesive, two-component material or thermoplastic material
  • the pretreatment material is suitable for closing pores on the surface of the workpiece and/or leveling out unevenness so that a high-quality result can be achieved in a subsequent step for coating the surface of the workpiece.
  • thermoplastic material can be applied to a workpiece in a heated state and then hardens.
  • the hardening process can be accelerated, for example, by a cooling device.
  • a two-component material has proven to be particularly advantageous because this material is self-hardening.
  • the pretreatment device can comprise an activation device, in particular a UV activation device, in order to achieve rapid curing of a pretreatment material, in particular if it is a UV varnish or UV hot melt adhesive.
  • the pretreatment device comprises a nozzle, in particular a slot nozzle, and a stripping device for smoothing the material discharged from the nozzle. In this way, a high-quality pretreatment result can be achieved.
  • the pretreatment device comprises an application nozzle/spray nozzle or several application nozzles. In this way, a contactless and uniform application of a pretreatment material can take place.
  • pretreatment materials for example, a hardener in the edge area of a two-component material.
  • dyes can be added in a targeted manner.
  • the printing device has at least one print head, preferably several print heads.
  • the nozzles of the print head have a diameter in the range from 2 ⁇ m to 200-300 ⁇ m, preferably in the range from 2 ⁇ m to 100 ⁇ m, particularly preferably in the range from 2 ⁇ m to 12 ⁇ m.
  • each print head can be used to apply a cover layer to the workpiece in such a way that a multi-layer structure is created starting from the surface pretreated with the pretreatment device.
  • an outermost layer can be designed as a protective layer made of a particularly resistant material. If this outermost layer is transparent, a decorative layer can be formed underneath this protective layer.
  • layers can be provided that give the entire coating a certain thickness that is coordinated with the design of the cover layer present on the broad side.
  • an electrically conductive material can be provided in one of the layers.
  • the print heads of the printing device each have a separate material storage. This allows the print heads to be supplied with different materials.
  • the print heads of the printing device can have a variable print height. This means that, for example, workpieces of different thicknesses can be printed on a narrow surface.
  • the invention further relates to a method for coating a surface of a workpiece, such as in particular a narrow side of a plate-shaped workpiece.
  • a device according to one of the preceding claims can be used within the scope of the method.
  • the method comprises the steps of: pretreating a surface to be coated with a pretreatment device, bringing about a relative movement between the pretreatment device and the workpiece, and printing the pretreated surface using one or more print heads.
  • a material applied by the pretreatment device is a UV varnish, a UV hot melt adhesive, a two-component material or a thermoplastic material.
  • a UV varnish or a UV hot melt adhesive can be cured in particular using a UV source. The surface pretreated in this way can therefore be printed relatively quickly.
  • a thermoplastic material can be applied to a workpiece in a heated state and then hardens. The curing process can be accelerated, for example, by a cooling device.
  • a two-component material has proven to be particularly advantageous in that a two-component material is self-curing.
  • a material applied by at least one of the print heads is PVC (polyvinyl chloride), PP (polypropylene), ABS (acrylonitrile-butadiene-styrene copolymer), wood-plastic composite material (WPC; wood-plastic composites) or acrylic resin.
  • the surface has a profile, for example one or more radii and/or bevels. It can be provided that the profile is introduced into the workpiece by means of a processing device, for example a milling cutter, and then the pretreatment step takes place. In a further embodiment, a property of the surface to be coated is recorded before or after pretreatment. Based on the recording result, the pretreatment device and/or the print head(s) can be controlled and/or regulated (in particular by means of a control device).
  • FIG. 1 A device is shown schematically with which plate-shaped workpieces can be provided with a coating on their narrow side.
  • the plate-shaped workpieces mentioned are workpieces made of wood, wood materials or composite materials, in particular chipboard, MDF boards or the like.
  • a coating is to be applied to the narrow side of such workpieces in order to improve the narrow side.
  • the main side also called the broad side, either has a top layer or does not require any further coating.
  • a workpiece W is moved in a horizontal direction by means of the device.
  • the direction of movement is indicated in the attached figure with an arrow.
  • the device comprises a conveyor device, such as a Transport belt, a conveyor belt or conveyor chain.
  • a workpiece can also be moved using a robot.
  • the device also has a pretreatment device 20, which is designed to apply a pretreatment material to the narrow side of the workpiece W to be coated.
  • the pretreatment device 20 comprises a nozzle (in particular a slot nozzle) and a stripping device for smoothing the material applied by the nozzle.
  • the pretreatment device can comprise a spray nozzle.
  • the pretreatment material is used to even out pores and unevenness on a narrow side of the workpiece W and to provide a flat and uniform surface.
  • a UV varnish, a UV hot melt adhesive, a two-component material or a thermoplastic material have proven to be particularly advantageous as pretreatment materials, whereby a UV varnish and a UV hot melt adhesive in particular can be cured using a UV source.
  • a thermoplastic material can be applied to a workpiece in a heated state and then hardens. The curing process can be accelerated, for example, by a cooling device.
  • a two-component material can be mixed from two components before being applied to the workpiece, so that a self-curing process is started.
  • the pretreatment device 20 is therefore designed to apply at least one of the materials mentioned to the narrow side of the workpiece W and thus to prepare the narrow side for a subsequent processing step.
  • the narrow side of the workpiece W provided with the hardened pretreatment material provides a surface that is tempered during further processing, in particular Such a surface has a similarly hard structure as other sides of the workpiece.
  • the device further comprises a printing device 30 which has a plurality of printing heads 30a, 30b.
  • a printing device 30 which has a plurality of printing heads 30a, 30b.
  • two printing heads are provided, although a larger number (number n) of printing heads can also be used.
  • the print heads are designed as inkjet print heads, whose nozzles have a diameter in the range of approx. 2 ⁇ m to 12 ⁇ m.
  • an outermost layer can be designed as a protective layer made of a particularly resistant material. If this outermost layer is transparent, a decorative layer can be formed underneath this protective layer. Furthermore, layers can be provided that give the entire coating a certain thickness that is coordinated with the design of the cover layer present on the broad side. An electrically conductive material can be provided in one of the layers.
  • the surfaces to be coated may already be provided with a profile. Accordingly, the print heads 30a, 30b of the printing device 30 are also adapted to such a profile in order to ensure that the nozzles of the print heads are at the same distance from the surface to be coated.
  • the device further comprises a detection device 10, which has a first detection module 10a and a second detection module 10b.
  • the first detection module 10a is arranged in front of the pretreatment device 20, whereas the second detection module 10b is arranged downstream of the pretreatment device 20.
  • the detection modules 10a, 10b are designed to carry out contactless detection of a surface.
  • the first detection module 10a detects a still untreated surface of the workpiece W and, based on the detection result, a setting or adjustment of the pretreatment device 20 is carried out. For example, the amount of pretreatment material to be dosed can be set or changed. This ensures that possible pores or unevenness on the narrow side of the workpiece W are compensated and/or filled.
  • the second detection module 10b can be used to check the work result of the pretreatment device 20 in order to ensure a high-quality surface before printing with the printing device 30.
  • the device can further comprise a processing device for processing the surface of a workpiece W.
  • a processing device for processing the surface of a workpiece W.
  • a profile can be introduced into the surface of a workpiece W if required before a pretreatment material is applied to the narrow side of the workpiece W to be coated by means of the pretreatment device 20.
  • the processing device can be omitted, in particular if the device is to be used to coat workpieces that have a flat narrow side or have already been provided with a profile.
  • Processing of a plate-shaped workpiece is carried out as described below.
  • the workpiece W is placed on a conveyor of the device and moved in the direction of movement.
  • the workpiece W is aligned and conveyed into the area of the first detection module 10a of the detection device 10.
  • the first detection module 10a determines whether the narrow side of the workpiece being evaluated has unevenness and/or pores. A quantitative detection of the unevenness and/or pores is also carried out.
  • the result determined by the first detection module 10a is transmitted to the control device of the device, wherein the control device is configured to make settings on the pretreatment device 20 arranged downstream in the flow direction based on the detection result.
  • the surface of the workpiece W is then pretreated using the pretreatment device 20 by applying a pretreatment material to the surface of the workpiece.
  • This pretreatment material is preferably a UV varnish, UV hot melt adhesive, or a thermoplastic material, which is applied using a nozzle and distributed and smoothed on the surface of the workpiece W using a smoothing device.
  • a second detection module 10b is provided in the direction of flow, downstream of the pretreatment device 20, which detects the area pretreated with the pretreatment device 20.
  • the detection result is transmitted to the control device of the device.
  • the control device is set up to carry out a control of the pretreatment device 20 based on the detection result of the second detection module 10b, for example by to reduce or increase the amount applied to the pretreatment device 20.
  • the workpiece W then enters the area of the printing device 30, which has a plurality of print heads.
  • a multi-layer structure is generated on the narrow side of the workpiece W in order to temper the narrow side of the workpiece W.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)

Claims (13)

  1. Dispositif pour le revêtement d'une surface d'une pièce (W), en particulier d'une tranche d'une pièce en forme de panneau, comprenant :
    au moins un dispositif de prétraitement (20) destiné à prétraiter la surface à revêtir,
    un système destiné à déclencher un déplacement relatif entre le dispositif de prétraitement (20) et la pièce (W), et
    au moins un système d'impression (30), en particulier un système d'impression à jet d'encre, dans lequel le système d'impression (30) comprend au moins une tête d'impression numérique (30a, 30b), dans lequel
    le dispositif de prétraitement (20) est mis au point pour appliquer un matériau de prétraitement sur la surface de la pièce (W) à imprimer,
    présentant en outre un système de détection (10) destiné à détecter une propriété de la surface à revêtir, dans lequel un système de commande du dispositif est mis au point pour commander et/ou réguler le dispositif de prétraitement (20) et/ou le système d'impression (30) sur la base du résultat de détection du système de détection (10),
    caractérisé en ce que le système de détection (10) comprend :
    un premier module de détection (10a), qui est disposé et est mis au point pour détecter la surface à revêtir avant le prétraitement, et
    un deuxième module de détection (10b), qui est disposé et est mis au point pour détecter la surface après le prétraitement.
  2. Dispositif selon la revendication 1, caractérisé en ce que le dispositif de prétraitement (20) est mis au point pour appliquer une laque, une colle thermofusible, un matériau à deux composants ou un matériau thermoplastique.
  3. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le dispositif de prétraitement (20) comprend un dispositif d'activation, en particulier un dispositif d'activation aux UV.
  4. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le dispositif de prétraitement (20) comprend une buse, en particulier une buse à fente ou une buse de pulvérisation, et de préférence un système de raclage destiné à lisser le matériau distribué depuis la buse.
  5. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les buses de la tête d'impression présentent un diamètre dans la plage de 2 µm à 300 µm, de préférence de 2 µm à 200 µm, plus préférentiellement dans la plage de 2 µm à 100 µm, le plus préférentiellement dans la plage de 2 µm à 12 µm.
  6. Dispositif selon l'une quelconque des revendications précédentes, dans lequel le système d'impression présente plusieurs têtes d'impression (30a, 30b).
  7. Dispositif selon la revendication 6, caractérisé en ce que les têtes d'impression (30a, 30b) du système d'impression (30) présentent respectivement un réservoir de matériau séparé.
  8. Dispositif selon l'une quelconque des revendications 6 à 7, caractérisé en ce que les têtes d'impression (30a, 30b) du système d'impression (30) présentent une hauteur d'impression variable.
  9. Dispositif selon l'une quelconque des revendications précédentes, comprenant en outre un système d'usinage destiné à usiner la surface d'une pièce (W), en particulier destiné à pratiquer un profil dans la surface d'une pièce (W).
  10. Procédé destiné à revêtir une surface d'une pièce (W), en particulier une tranche d'une pièce en forme de panneau, comprenant :
    le prétraitement d'une surface à revêtir avec un dispositif de prétraitement (20),
    le déclenchement d'un déplacement relatif entre le dispositif de prétraitement (20) et la pièce (W), et
    l'impression de la surface prétraitée au moyen d'une tête d'impression numérique ou de plusieurs têtes d'impression numériques (30a, 30b),
    caractérisé par une détection d'une propriété de la surface à traiter avant et après le prétraitement, dans lequel le dispositif de prétraitement (20) et/ou la ou les têtes d'impression sont commandés et/ou régulés sur la base du résultat de détection.
  11. Procédé selon la revendication 10, caractérisé en ce qu'un matériau distribué depuis le dispositif de prétraitement (20) est une laque UV, une colle thermofusible UV, un matériau à deux composants ou un matériau thermoplastique.
  12. Procédé selon la revendication 10 ou la revendication 11, caractérisé en ce qu'un matériau distribué par la tête d'impression ou par au moins une des têtes d'impression (30a, 30b) est du chlorure de polyvinyle, du polypropylène, de l'ABS, un matériau composite en bois-matière plastique ou de la résine acrylique.
  13. Procédé selon l'une quelconque des revendications 10 à 12, caractérisé en ce que la surface présente un profil.
EP20820132.7A 2019-12-06 2020-12-04 Dispositif et procédé pour couvrir une surface de piece de travail Active EP4069482B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019133335.0A DE102019133335A1 (de) 2019-12-06 2019-12-06 Vorrichtung sowie ein Verfahren zum Beschichten einer Fläche eines Werkstücks
PCT/EP2020/084704 WO2021110952A1 (fr) 2019-12-06 2020-12-04 Appareil et procédé de revêtement d'une surface d'une pièce

Publications (2)

Publication Number Publication Date
EP4069482A1 EP4069482A1 (fr) 2022-10-12
EP4069482B1 true EP4069482B1 (fr) 2024-06-26

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EP20820132.7A Active EP4069482B1 (fr) 2019-12-06 2020-12-04 Dispositif et procédé pour couvrir une surface de piece de travail

Country Status (5)

Country Link
US (1) US20230015828A1 (fr)
EP (1) EP4069482B1 (fr)
CN (1) CN114761189B (fr)
DE (1) DE102019133335A1 (fr)
WO (1) WO2021110952A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2022301562A1 (en) * 2021-07-02 2024-01-18 Jowat Se Edge coating of substrates, especially plate-shaped substrates

Citations (4)

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WO2002000449A1 (fr) * 2000-06-26 2002-01-03 Bauer Joerg R Procede, dispositif et systeme permettant de realiser des elements structurels ayant une apparence de surface predeterminee, notamment des plaques frontales d'elements de cuisine
DE202004000662U1 (de) * 2004-01-17 2004-04-08 Homag Holzbearbeitungssysteme Ag Maschine zum Bedrucken der Schmalseiten plattenförmiger Werkstücke
EP1726443A1 (fr) * 2005-04-28 2006-11-29 Homag Holzbearbeitungssysteme AG Procédé et appareil pour marquer les côtés d'une pièce detacheée plane
EP1839883A1 (fr) * 2006-03-08 2007-10-03 Homag Holzbearbeitungssysteme AG Procédé et dispositif pour imprimer sur des objets en forme de plaque

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DE10224128A1 (de) * 2002-05-29 2003-12-18 Schmid Rhyner Ag Adliswil Verfahren zum Auftrag von Beschichtungen auf Oberflächen
EP1892107B1 (fr) * 2006-08-25 2009-11-04 Homag Holzbearbeitungssysteme AG Dipositif pour imprimer un motif sur des pièces d'usinage
ES2402367T3 (es) * 2006-12-20 2013-05-03 Homag Holzbearbeitungssysteme Ag Dispositivo y procedimiento para recubrir piezas
ES2384578T3 (es) * 2007-11-30 2012-07-09 Homag Holzbearbeitungssysteme Ag Dispositivo y procedimiento de mecanizado de materiales en forma de banda para la decoración de una pieza de trabajo
KR101456293B1 (ko) * 2012-01-13 2014-11-03 전광심 프린팅 도포 방식을 이용한 목재판 엣지면의 표면처리 방법
DE102015212409A1 (de) * 2015-07-02 2017-01-05 Homag Holzbearbeitungssysteme Gmbh Verfahren zum Beschichten und Kennzeichnen von Werkstücken
DE102015219108A1 (de) * 2015-10-02 2017-04-06 Homag Gmbh Verfahren sowie Vorrichtung zur Schmalflächenbeschichtung
DE202019104261U1 (de) * 2019-08-02 2020-11-03 Surteco Gmbh Kantenleiste

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
WO2002000449A1 (fr) * 2000-06-26 2002-01-03 Bauer Joerg R Procede, dispositif et systeme permettant de realiser des elements structurels ayant une apparence de surface predeterminee, notamment des plaques frontales d'elements de cuisine
DE202004000662U1 (de) * 2004-01-17 2004-04-08 Homag Holzbearbeitungssysteme Ag Maschine zum Bedrucken der Schmalseiten plattenförmiger Werkstücke
EP1726443A1 (fr) * 2005-04-28 2006-11-29 Homag Holzbearbeitungssysteme AG Procédé et appareil pour marquer les côtés d'une pièce detacheée plane
EP1839883A1 (fr) * 2006-03-08 2007-10-03 Homag Holzbearbeitungssysteme AG Procédé et dispositif pour imprimer sur des objets en forme de plaque

Also Published As

Publication number Publication date
CN114761189A (zh) 2022-07-15
CN114761189B (zh) 2023-09-19
DE102019133335A1 (de) 2021-06-10
US20230015828A1 (en) 2023-01-19
EP4069482A1 (fr) 2022-10-12
WO2021110952A1 (fr) 2021-06-10

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