EP2066456B2 - Procédé de revêtement en poudre de substrats en bois - Google Patents

Procédé de revêtement en poudre de substrats en bois Download PDF

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Publication number
EP2066456B2
EP2066456B2 EP07786677.0A EP07786677A EP2066456B2 EP 2066456 B2 EP2066456 B2 EP 2066456B2 EP 07786677 A EP07786677 A EP 07786677A EP 2066456 B2 EP2066456 B2 EP 2066456B2
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EP
European Patent Office
Prior art keywords
wood substrates
powder
nozzle
wood
hot air
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.)
Not-in-force
Application number
EP07786677.0A
Other languages
German (de)
English (en)
Other versions
EP2066456B1 (fr
EP2066456B8 (fr
EP2066456A1 (fr
Inventor
Peter Hauer
Werner Deuring
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.)
Vits Technology GmbH
Original Assignee
Vits Technology 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
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Application filed by Vits Technology GmbH filed Critical Vits Technology GmbH
Publication of EP2066456A1 publication Critical patent/EP2066456A1/fr
Publication of EP2066456B1 publication Critical patent/EP2066456B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/06—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0209—Multistage baking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B05D3/0263—After-treatment with IR heaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B05D3/0413—Heating with air

Definitions

  • the invention relates to a method for powder coating of wood substrates according to the preamble of claim 1 and to an apparatus for carrying out the method according to the preamble of claim 7.
  • the powder coating of metal parts is already well known.
  • the furniture industry is eager to use wood substrates that are powder coated. This was due to the poor electrical conductivity of wood initially the problem of applying the paint powder evenly on the wood substrates. This problem seems largely solved.
  • the powder layer must be fused and crosslinked. On the one hand, the wood substrate should not get too hot otherwise vapor bubbles will form, which can destroy the powder coating.
  • High temperature MDF boards can damage the glue parts and thus significantly reduce the stability of the boards.
  • wood substrate there are defined parts containing wood, e.g. Solid wood, plywood or wood fibers.
  • the wood substrate is present in particular in the form of plates.
  • the US 6,596,347 B2 describes a multi-stage process for applying two layers of powder to substrates made of metal or plastic.
  • the layers are cross-linked one after another, with infrared radiation and hot air treatment taking place simultaneously.
  • the air velocity is 0.5 to 13 m / s.
  • the temperature of the substrate reaches 125 ° to 200 ° C.
  • the method is not suitable for the treatment of wood substrates because the temperature of the substrate is too high.
  • An object of the invention is to provide a process for the powder coating of wood substrates, in which the paint layer is largely crosslinked. Another object is to provide an apparatus for carrying out the method.
  • the problem is solved by claim 1.
  • the freshly sprayed wood substrates are pretreated by means of a brief infrared radiation so that the paint powder so just adheres to the wood substrates and the surface of the powder layer is pre-crosslinked. In this case, most of the paint powder melts, so that the paint powder parts stick together and with the substrate surface. Only then is the subsequent hot air treatment possible.
  • This is done according to the invention intensive, that is short and with very high air velocities. This causes heat to be transferred to the surfaces of the wood substrates very quickly, thus achieving the required temperature in the powder layer within a very short time, and therefore crosslinking.
  • the short treatment time causes the heat does not penetrate far into the plate and therefore it is heated only relatively little. Due to the very high air velocity, not only are the major surfaces e.g. intensively treated by plates, but also e.g. End faces and / or undercut surfaces. This eliminates special treatments for such areas. Due to the short treatment times required, productivity is high.
  • a pretreatment as in the DE 10 2005 003 802 A1 is described (grinding, scarfing), is carried out for the inventive method only in such wood substrates in which the surfaces do not have a required smoothness depending on the paint powder used. Spraying with primer is not required in any case.
  • the temperature of the hot air of 120 ° to 200 ° C ensures a largely networking of the paint layer, without the wood substrate is too hot.
  • the treatment time of the hot air treatment from 100 s to 300 s is adapted to the temperature of the hot air.
  • the arrangement of a plurality of nozzle boxes in succession allows optimal coordination between the transport speed of the wood substrates and the treatment time in the hot air treatment.
  • variable adjustability of the distance of opposite nozzle boxes allows an optimal adjustment of the distance of the nozzle boxes to the surface of the wooden substrates.
  • the flow can be adapted to the wooden substrates according to their design.
  • the fischgrat shame arrangement of radiators in the pretreatment causes also other than the main surfaces of the wood substrates are reached by the rays. This virtually all surfaces of the powder coating are melted.
  • a device for powder coating comprises a transport device 1, to which wood substrates 2 with a general transport direction according to arrow 3 can be suspended at a loading station.
  • the transport device 1 is performed, for example, as an endless loop.
  • successive means for spraying 4 of the paint powder means for preheating 5 the freshly applied powder layer by means of infrared rays and means for fusing and crosslinking 6 of the preheated powder layer.
  • the transport device 1 is e.g. an overhead conveyor with a rail 7, in which a circulating chain is guided. Hooks 8 can be hooked into the chain (selectable according to the size of the wood substrates).
  • the means for spraying 4 the paint powder are known and are e.g. supplied by the company Wagner (CH Alt Zhaon) or Nordson (DE Erkrath). They will not be described here.
  • the means for preheating 5 of the freshly sprayed coating powder are in FIG. 2 Particularly well to recognize and include two with their front sides parallel opposite carrying frames 9. Their mutual distance is variable via eg a handwheel adjustable.
  • Each support frame 9 is surrounded on five sides by a first housing 10, and on the front side a plurality of infrared radiators 11 is attached.
  • the infrared radiators 11 are tubular carbon radiators, which are fixed in a fishbone manner at the level of the front side.
  • the infrared radiator 11 are in this case arranged in two columns, wherein they extend at an angle of approximately 45 ° from the bottom to the top to the center of the front.
  • infrared emitters 11 Down from the center and top of the sides of the front side starting infrared emitters 11 lesser (half effective here) length attached to keep the area as low as possible without infrared emitters.
  • the envelope of the entirety of the infrared radiator 11 results in an effective area of the preheating means 5 for each side.
  • the carbon radiators for example of the CRS 2300 G type from Heraeus, are coated on their side facing the housing with an infrared ray-reflecting material, eg with gold steamed.
  • the infrared radiator 11 can be installed so twisted that the emission direction is alternately directed by 45 °, for example, upwards and downwards. To protect the infrared radiator 11 from overheating, they are assigned a forced ventilation.
  • the infrared radiator 11 can be switched on individually or in groups.
  • each nozzle box 12 faces another at a predetermined distance, and each panel 6a has two opposed nozzle boxes 12.
  • the distance between two opposite front sides of the nozzle boxes 12 is variably adjustable.
  • Each nozzle box 12 is mounted in a machine frame 13. Each nozzle box 12 is associated with a pressure box 14 which is connected via channels 15 with that. In each pressure box 14, a fan 16 is arranged at a suction opening, which is driven by a motor and stored in the machine frame 13. At the front of each nozzle box 12, a plurality of here eight parallel, vertically aligned nozzles 17 is attached. Each nozzle 17 has a plane nozzle plane with nozzle openings arranged in a pattern and is connected to the nozzle box 12 by a pressure line 18. Between opposite nozzle levels, a treatment room is formed. As a heat source for heating circulating air, a burner 19 is arranged so that the hot gases leaving it reach the suction chamber of the fan 16.
  • the fusing and crosslinking means 6 are surrounded by a heat-insulating casing except for a slot 20 for passing the hooks 8 and the wood substrates 2.
  • the machine frame 13 is integrated. All or individual partitions between two panels 6a may be insulated.
  • nozzles 17 described above with a plane nozzle plane are replaced by nozzles 17 with a specific nozzle plane. Two examples of this are from the FIGS. 5 and 6 seen.
  • the nozzle planes here are each zigzag-shaped, with the zigzag shape in the example of FIG. 5 in cross-section and in the example of FIG. 6 is formed in the longitudinal section of the nozzle plane.
  • the effective height of the means for preheating 5 and the means for fusing and crosslinking 6 corresponds at least to the largest height of the wooden substrates 2 to be treated, the latter height relating to a condition suspended in the transport device 1.
  • the effective height here is about 2 m.
  • the wood substrates 2 to be processed in the device preferably have a moisture content of 7% by weight. For this they are before the powder coating e.g. stored in a climatic chamber at 50% relative humidity and a temperature of 20 ° C.
  • the provided wood substrates 2 are mounted by machine or by hand in the hook 8 of the transport device 1 and continuously conveyed in the direction of the arrow 3 through the device.
  • the wood substrates 2 first pass into the spraying means 4, where all surfaces are sprayed with a suitable paint powder in a uniform thickness; so that the paint powder sufficiently adheres to the wood substrates 2, they are electrostatically charged.
  • the freshly sprayed with the paint powder wood substrates 2 are then transported into the preheating means 5.
  • all infrared radiators 11 are normally switched on.
  • the powder layer is heated so that it at least softens and glued to the wood substrate 2 and the individual particles with each other. Due to the special arrangement of the infrared radiator 11 and the secondary surfaces (top, bottom, front and rear sides) of the wood substrates 2 are sufficiently heated.
  • the wood substrates 2 enter the means for fusing and crosslinking 6.
  • the fans 16 operate and blow hot air from the nozzles 17 onto the surfaces of the wood substrates 2;
  • the air here has a temperature of 130 ° to 200 ° C and an impact velocity of 20 to 35 m / s.
  • the previously molten powder layer melts completely and within a short time is largely crosslinked (sintered).
  • the result is a closed paint surface of the powder layer with a certain smoothness, which has a high chemical and mechanical stability.
  • each fan 16 sucks the air from an upper and a lower part of the treatment space and pushes them back into the treatment space on the wood substrates 2 via the pressure box 14, the air channels 15, the nozzle box 12, the pressure lines 18 and the nozzles 17.
  • the air flow emerging from the nozzles 17 is substantially perpendicular to the main surfaces of the wood substrates 2.
  • the air is heated by the burner 19 to the desired temperature of 130 ° to 200 ° C and kept constant by a corresponding control.
  • the burners 19 of the last panel 6a are out of operation, and the fans 16 suck in ambient air as cooling air. For this purpose, corresponding flaps are opened. The heated cooling air is discharged.
  • the finished coated wood substrates 2 are unmounted by hand or by machine from the transport device 1 and removed or stored.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Claims (11)

  1. Procédé de revêtement de substrats en bois par poudrage,
    dans lequel les substrats en bois (2) sont préparés et ensuite transportés en continu,
    dans lequel la peinture en poudre est pulvérisée sur les substrats en bois (2),
    et dans lequel la peinture en poudre fraîchement déposée sur les substrats en bois (2) est fondue et réticulée pour former une couche de peinture,
    caractérisé en ce que les substrats en bois (2) fraîchement revêtus par pulvérisation sont prétraités avec un rayonnement infrarouge de courte durée de telle façon que la peinture en poudre adhère de justesse aux substrats en bois (2) et que les surfaces de la couche de poudre sont pré-réticulées,
    en ce que les surfaces des substrats en bois (2) ainsi traités sont ensuite soumises à un traitement à l'air chaud intensif dans lequel la température des substrats en bois (2) reste inférieure à 100°C
    et en ce que le flux d'air chaud est sensiblement perpendiculaire aux surfaces des substrats en bois (2.
  2. Procédé selon la revendication 1 ou 2, caractérisé en ce que la vitesse de l'air chaud au niveau des surfaces va de 6 à 40 m/s, de préférence de 20 à 35 m/s.
  3. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que la température de l'air chaud se situe dans la plage de 130° à 200°C.
  4. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la durée du traitement à l'air chaud se situe dans la plage de 100 secondes à 300 secondes.
  5. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que la durée du prétraitement se situe dans la plage de 30 secondes à 90 secondes.
  6. Dispositif de revêtement de substrats en bois par poudrage,
    avec des moyens de transport (1) pour les substrats en bois (2),
    avec des moyens de pulvérisation de la peinture en poudre sur les substrats en bois (2),
    avec des moyens de préchauffage (5) de la couche de poudre fraîchement déposée par un rayonnement infrarouge,
    et avec des moyens de fusion et réticulation (6) de la couche de poudre prétraitée,
    caractérisé en ce que les moyens de fusion et réticulation (6) comprennent au moins une paire de boites de buses (12) qui se font face à une distance prédéfinie,
    en ce que les buses (17) des boites de buses (12) sont disposées verticales et sensiblement parallèles les unes aux autres,
    et en ce qu'un plan de chaque buse (17) est configuré de telle sorte que les flux d'air sortants frappent les surfaces principales des substrats en bois (2) sensiblement à la verticale.
  7. Dispositif selon la revendication 7, caractérisé en ce que plusieurs boites de buses (12) sont disposées à la suite les unes des autres dans le sens de transport.
  8. Dispositif selon la revendication 7 ou 8, caractérisé en ce que la distance entre les boites de buses opposées (12) est réglable de manière variable.
  9. Dispositif selon l'une des revendications 7 à 9, caractérisé en ce que la distance entre les boites de buses opposées (12) va de 100 mm à 500 mm.
  10. Dispositif selon l'une des revendications 7 à 10, caractérisé en ce que les buses (17) sont utilisées avec différents plans de buses.
  11. Dispositif selon l'une des revendications 7 à 11, caractérisé en ce que les moyens de préchauffage (5) comprennent une pluralité de rayonneurs infrarouges électriques tubulaires (11) disposés en arête de poisson.
EP07786677.0A 2006-09-22 2007-08-14 Procédé de revêtement en poudre de substrats en bois Not-in-force EP2066456B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006044959A DE102006044959B4 (de) 2006-09-22 2006-09-22 Verfahren und Vorrichtung zum Pulverbeschichten von Holzsubstraten
PCT/EP2007/007162 WO2008034497A1 (fr) 2006-09-22 2007-08-14 Procédé et dispositif de revêtement en poudre de substrats en bois

Publications (4)

Publication Number Publication Date
EP2066456A1 EP2066456A1 (fr) 2009-06-10
EP2066456B1 EP2066456B1 (fr) 2010-07-21
EP2066456B8 EP2066456B8 (fr) 2010-09-08
EP2066456B2 true EP2066456B2 (fr) 2014-06-11

Family

ID=38690110

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07786677.0A Not-in-force EP2066456B2 (fr) 2006-09-22 2007-08-14 Procédé de revêtement en poudre de substrats en bois

Country Status (6)

Country Link
US (1) US20090181181A1 (fr)
EP (1) EP2066456B2 (fr)
AT (1) ATE474673T1 (fr)
CA (1) CA2663876A1 (fr)
DE (2) DE102006044959B4 (fr)
WO (1) WO2008034497A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007061498B3 (de) * 2007-12-18 2009-02-19 Wd Beteiligungs Gmbh Verfahren und Vorrichtung zum Pulverbeschichten von Holzsubstraten
DE102009006660A1 (de) 2009-01-29 2010-08-05 Baumer Innotec Ag Pipeline-Recheneinrichtung zur Verbindung von Konturelementen aus Bilddaten
CN104903113B (zh) * 2012-10-12 2019-04-12 知识产权古里亚有限责任公司 生产在至少一个表面上具有图像的基体的方法
CN108672149A (zh) * 2018-06-15 2018-10-19 安徽枫帆轨道装备有限公司 一种门板侧面喷漆装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE504783C2 (sv) * 1995-08-10 1997-04-21 Triline Ab Förfarande och anläggning för pulverlackering
DE19831781A1 (de) * 1998-07-15 2000-01-27 Industrieservis Ges Fuer Innov Verfahren zur Pulverlackierung
CN1203924C (zh) * 1998-03-16 2005-06-01 先进光子学技术股份公司 用于粉末油漆的方法
US6596347B2 (en) * 1999-05-26 2003-07-22 Ppg Industries Ohio, Inc. Multi-stage processes for coating substrates with a first powder coating and a second powder coating
WO2006028432A1 (fr) * 2003-05-21 2006-03-16 Mdf Powder Coat Systems L.L.C. Procede et appareil permettant de faire chauffer et durcir des revetements en poudre sur des produits en bois poreux
DE102005003802A1 (de) * 2004-12-10 2006-06-14 Nütro Maschinen- und Anlagenbau GmbH & Co. KG Strahlungsgerät sowie Pulverauftragsstation und Anordnung zur Beschichtung von temperatursensiblen Materialien und Verfahren hierzu

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
W. SAUTER ET AL: "Demonstrationsanlage zur umweltfreundlichen MDF-Pulverbeschih", INVESTITIONEN ZUR VERMINDERUNG VON UMWELTBELASTUNGEN, November 2004 (2004-11-01), pages 1 - 73 †

Also Published As

Publication number Publication date
US20090181181A1 (en) 2009-07-16
EP2066456B1 (fr) 2010-07-21
DE102006044959A1 (de) 2008-04-03
WO2008034497A1 (fr) 2008-03-27
EP2066456B8 (fr) 2010-09-08
DE502007004513D1 (de) 2010-09-02
ATE474673T1 (de) 2010-08-15
CA2663876A1 (fr) 2008-03-27
EP2066456A1 (fr) 2009-06-10
DE102006044959B4 (de) 2012-04-12

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