Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
  • F26B25/001—Handling, e.g. loading or unloading arrangements
  • F26B25/003—Handling, e.g. loading or unloading arrangements for articles
  • F26B25/004—Handling, e.g. loading or unloading arrangements for articles in the shape of discrete sheets
• • 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
  • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
  • F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
  • F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B3/00—Drying solid materials or objects by processes involving the application of heat
  • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
  • F26B3/283—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection
• • 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
  • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
  • B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
  • B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders
• • 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
  • B05D3/0272—After-treatment with ovens
• • 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
  • B05D3/06—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 radiation
  • B05D3/061—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 radiation using U.V.
  • B05D3/065—After-treatment
  • B05D3/067—Curing or cross-linking the coating

Definitions

• the present invention relates to a radiation device according to the preamble of
• Claim 1 an arrangement for powder coating according to the preamble of claim 13, a powder application station according to the preamble of claim 23 and a method for powder coating according to the preamble of claim 25.
• the powder coating or the powder coating has the advantage that a variety of operations such as application of primers (PrimierunDgen), filling layers, etc. and associated intermediate processing steps such as grinding u. Like. Can be dispensed with and also an extremely attractive and smooth, can be provided with many effects surface can be created.
• TemDperaturen of over 120 0 C up to 200 0 C must be reached.
• these temperatures are too high for temperature-sensitive substrates, such as wood-based materials or wood fiber (MDF), as they can lead to evaporation of moisture in the wood and thus cause cracking.
• AnD claim 1 or 4 an arrangement having the features of claim 13, a powder application station with the features of claim 23 and a method having the features of claim 25.
• Advantageous embodiments are the subject of the dependent claims.
• a radiation device is provided with energy, in particular heat radiators, preferably short-wave infrared (IR) radiators or ultraviolet (UV) radiators, in which the energy radiators are arranged on a support and together are movable with the carrier or per se and / or are arranged in a kind of circular or ring shape.
• IR infrared
• UV ultraviolet
• the radiators can be arranged in a circle or ring, since this shape for a variety of shaped substrates, but in particular plate-shaped substrates that are moved past the radiators, a uniform, in particular repeated, but not too long Radiation ensures.
• the radiators are arranged so that they project beyond the substrate in at least one direction in order to reach all surfaces of the substrate with the radiation.
• the radiators are preferably also adjustably arranged on the support in such a way that they can be aligned with the object to be irradiated with their main direction of the beam.
• mounting elements have proven that on a support base structure, for. B. in ring, plate or disc shape are arranged pivotally and preferably about an axis which lies in the plane of the carrier base structure, so that the BEDDOTen to the mounting elements emitter can be pivoted out of the carrier ground plane and the main radiation direction of the emitters different from the normal the carrier basic level becomes.
• Infrared radiators can be designed, in particular, as linear radiators in segment-wise arrangements or as ring-shaped or circular radiators. Accordingly, only one radiator for one-sided irradiation or two or more radiators for one-sided and two-sided irradiation can be provided on the radiator.
• a simultaneous two-sided irradiation is preferred in which in each case a carrier base structure with the emitter or emitters arranged thereon is arranged opposite to one another and encloses between it the transport path for the object to be coated.
• all other possible energy radiators in particular also UV radiators, can be arranged on the radiation device.
• an arrangement according to the invention for powder coating temperature-sensitive materials with the radiation device described above comprises an upstream powder application station and a downstream area for curing or crosslinking the powder, preferably a furnace and in particular a circulating air oven.
• the radiation device according to the invention also in the downstream curing and crosslinking region, in particular in UV-curing coating systems.
• a corresponding arrangement comprises, for example, one or more radiation devices with IR radiators between the powder application station and the curing or crosslinking region and one or more radiation devices with UV radiators in or after the curing or crosslinking region.
• a combination of different energy sources is possible.
• the powder application station in which the powder to be coated is preferably deposited on the substrate by electrostatic spraying, has according to the invention so-called discharge elements, which serve to dissipate charge and smooth the field profile on the object to be coated, so that at the edges of ObDjekts, which usually comes to field concentrations, no accumulation of the powder to be coated takes place.
• the diverting elements are arranged so that between you and an opposing spraying device the object is arranged during powder application, ie the diverting element is located behind the object to be coated from the point of view of the spraying device or powder applicator.
• the diverting elements are preferably in the form of perforated plates, lamella pre-hangers, protective plates or grid structures.
• EinrichDtung provided with the diverters can be cleaned in a simple manner, for example by shaking off the powder.
• the area for curing and crosslinking the PuID which is provided in the arrangement according to the invention for powder coating of temperature-sensitive substrates, advantageously adjoins directly to the radiation apparatus in order to prevent the melting of the powder and the subsequent temperature treatment during curing and crosslinking to suffer no heat loss.
• the radiation device can also be integrated into the entry area for the curing / crosslinking area.
• the circulating air oven can be operated at a high air speed in the range from 1 to 5 m / s, preferably approximately 2 to 4 m / s, so that a large area of constant temperature, in particular over the adjusts the entire substrate to be coated.
• the furnace is divided into several zones in which different temperatures can be set, so that when passing through the Um KunststoffDofens the substrate to be coated can pass through a temperature profile. This ensures that the surface temperature required for curing and cross-linking can be maintained sufficiently high while the core temperature remains below a critical level.
• the number of zones is arbitrary, with values in the range of 3 to 5 zones having proved successful.
• sensors for measuring the surface temperature, which adjust the temperature to the desired value via a control based on the measured values.
• the radiation device according to the invention can also be used at this point of the arrangement, for example, for the post-curing of UV-curing coating systems with UV lamps.
• a climate chamber may be provided, in which the to be coated
• the wood-based materials and in particular MDF boards have a certain moisture, but should not exceed or fall below, in the range of greater than or equal to 5, preferably more than 8, in particular 5 to 15,% by weight.
• a plasma treatment device may be provided for this purpose.
• a primer in particular a biodegradable primer, which is an air- or vapor-tight barrier layer for the moisture contained in the material and beyond the pores in the surface of the workpiece closes.
• the primer is applied by water vapor assisted spraying, as described in German Patent Application DE 10 2004 012 889, which is incorporated herein by reference in its entirety.
• Sprays supported by the steam can in particular be water-soluble
• FIG. 1 shows a plant according to the invention for powder coating of MDF-DP slats
• Figs. 2a, 2b show a side view and a transverse view of a radiation device according to the invention, which is used in the arrangement in Fig. 1; and in
• FIG. 3 is a temperature-time diagram for a process described in the appendix of FIG.
• FIG. 1 shows, in a schematic representation, the structure of a plant according to the invention for the powder coating of MDF boards 8, as used in the furniture industry.
• the system has a total of six
• the transport t worn 7 realized by a rail assembly are received in the brackets 10 to which the MDF board 8 can be mounted.
• the MDF board 8 is replaced by a
• Abrasive wheels 9 machined on the surfaces to leave a smooth, clean surface.
• the MDF board in the processing station 2 is flamed at the surface by means of a gas burner 38 shown schematically, in order to remove any remaining wood fibers after the grinding process and to densify the surface by the effect of the flame.
• a plasma treatment plant (not shown) may be provided after or instead of the processing station 2 with the flame treatment, the surface also being densified by the plasma action on the surface.
• a painting installation with a spray booth 11 and an injection unit 14 is shown, through which a primer is applied to the surface of the MDF panel 8 by means of steam assisted painting.
• the primer serves to seal the surface gas-tight and to fill the pores in the surface of the MDF board 8, as in the patent application of Patrick Oliver Ott relating to a method for pretreating surfaces of HoIs and / or wood fiber composite blanks for subsequent powder - or film coating is described.
• a water-soluble primer which may be a commercially available primer, is preferably used, since this leads to particularly smooth and dense surface layers in connection with a steam-assisted process, as described in the patent application DE 10 2004 012 889.
• a water vapor generating device 12 is provided in addition to the paint supply device 13 in the painting installation of the processing station 3.
• Painting assisted by steam also has the advantage that the MDF board 8 provided with primer can be transferred to the next processing station immediately after painting in a continuous process, since the high temperature of the steam results in very rapid drying , If necessary, a buffer station (not shown) can be installed in the arrangement here in order to realize a certain drying time for the MDF boards 8.
• the powder application position 4 likewise being a housing 17 and corresponding devices for an electrostatic powder application, such as spray guns 16, powder reservoir 15, supply lines 20 and so on.
• an electrostatic powder application such as spray guns 16, powder reservoir 15, supply lines 20 and so on.
• a discharge element 18 which is grounded via the line 19 and serves to dissipate excess charge and to smooth the field line pattern on the object 8 to be coated Powder application at the edges, where field concentrations can form, to avoid.
• powder application means 16 in the form of a spraygun 16 are provided in the powder application station 4 for each side of the MDF board 8, wherein discharge nozzles 18 are arranged opposite to the spray guns 16.
• discharge nozzles 18 are arranged opposite to the spray guns 16.
• the second powder application spray gun 16 is not shown, since it is covered by the discharge element 18. Only the supply line 20 can be seen.
• Embodiment designed as a lattice-shaped structure in which the bars are formed as flat bars with a depth of a few centimeters (4 to 6 cm) and a thickness of about 0.5 to 1 cm.
• the bars are formed as flat bars with a depth of a few centimeters (4 to 6 cm) and a thickness of about 0.5 to 1 cm.
• further embodiments are conceivable, such as LaDmellenvor von, perforated plates, slotted sheets u.
• the MDF plate 8 is applied by the transporting device 7 with the
• the radiation device 21 is shown in a larger view in FIGS. 2a and 2b, wherein only a part of the radiation device without the drive 22 (see FIG. 1) is shown here.
• the radiation device 21 has a turnstile 29 as
• the turnstile 29 is about the axis 39, which is located in the center of the hub 29, rotatable or pivotable, as indicated by the arrows 32.
• a ring 46 is provided, which is designed as a polygon.
• the polygon ring 46 has ten in the embodiment shown LinearabDexcellente on which the infrared lamps 35 are arranged.
• mounting plates 33 are provided on the polygon ring 46 or the individual linear sections which are arranged around an axis of rotation 47 inclined to the polygon ring 46 or to the turnstile 29 and indeed out of the plane. spanning the turnstile 29 and the polygon ring 46.
• the mounting plates 33 have an acute angle to the normal of the
• Rotary axis 47 pivotally arranged so that the angle of inclination and the AbD beam direction of the mounted on the mounting plates 33 infrared lamps is adjustable.
• the polygon ring 46 with the infrared lamps 35 arranged thereon projects beyond the MDF boards to be handled in the vertical direction, so that the oblique arrangement of the infrared lamps on the mounting plates 33 a Einstrahlschkeit the infrared lamps on the top and bottom of the suspended MDF panels 8 consists.
• FIGS. 2a and 2b furthermore, the transport device is illustrated in greater detail, wherein the holders 10 are arranged on movable carriages 30 which move in a rail arrangement 31 out of a largely closed hollow profile.
• the brackets are conductive in the contact area with the MDF plates and otherwise insulating to ensure a discharge of charge and to avoid field line concentrations otherwise.
• the MDF board 8 After passing through the radiation device with the short-wave infrared emitters, the MDF board 8 thus processed enters directly into a circulating-air oven 6 as the sixth processing station (see FIG. 1), in which circulating air heated accordingly in several zones, for example three zones through inlet openings 24 from bottom to top (see arrow 27) is guided to the suction 25.
• the powder adheres firmly to the surface of the MDF board 8 by the upstream treatment in the radiation device 21, it is possible to set the speed of the circulated air very high, for example in the range of 1 to 5 m / s, preferably 2 m / s, so that over a long distance a constant temperature profile can be set.
• InfraDrotsensoren 26 are used, which measure the surface temperature of the MDF board 8 and thus can control the temperature control of the convection oven 6.
• the horizontal line 45 indicates the desired maximum core temperature for the MDF board 8, for example.
• the other curves indicate the ambient temperature near the MDF board (curve 40), the top surface temperatures on the MDF board (curves 41 and 42), and the core tempe- ratures in the MDF board (curves 43 and 44) during the sweep of the radiation tool 21 and the convection oven 6 at.
• the radiation device 21 As can be seen from the diagram, the radiation device 21 and the
• Heating with the short-wave infrared emitters 35 realized a very fast AufheiDzung the surface and the adhering powder, while the core temperature of the MDF plate 8 increases only much slower. Even after brief irradiation in the range of a few seconds up to one, two MinuDten the ambient temperature may reach values of 145 0 C to 160 0 C in the vicinity of the plate. The surface temperature at the plate reaches in the shown embodiment values of 130 0 C to 140 0 C.
• a passage of the convection oven is integrated, immediately thereafter, the surface temperature of the MDF plate 8 is kept almost constant by the hot circulating air, while the core temperature continues to rise slowly (curves 43 and 44).
• the temperature in the rear zones is gradually reduced as the MDF plate 8 passes through the circulating air oven 6, so that the surface temperature is kept as high as possible to achieve rapid curing and crosslinking of the powder while keeping the core temperature below the threshold Temperature is maintained.
• MDF boards should preferably have a residual moisture content of more than 5, in particular more than 8, preferably 15% by weight, which can be achieved, for example, by storage in climatic chambers or the like.
• the resistance in this case has a value of about 10 ⁇ .
• the MDF boards have a density of about 800 kg / m +/- 20 kg / m.
• the conductivity for example, by appropriate
• Infrared D emitters may also be used for other energy or heat radiation devices, in particular also medium infrared emitters or the like.
• Other types of curing or crosslinking alternatively or additionally are conceivable here, such as the curing by means of UV radiation.
• the radiation devices according to the invention can be used in turn in an advantageous manner.
• a grinding station is preferable
• the radiation device (21) is characterized in that the radiators are arranged in a ring or circular or movable, while at the powder application station (4) Deriving elements are provided which serve to smooth the electric field at the surface of the substrates and thus powder concentrations at edges u. Like. avoids.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Wood Science & Technology (AREA)
• Microbiology (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Coating Apparatus (AREA)
• Coating By Spraying Or Casting (AREA)

Priority Applications (2)

Applications Claiming Priority (3)

Related Child Applications (1)

Publications (2)

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ID=35832994

Family Applications (2)

Family Applications Before (1)

Country Status (7)

Families Citing this family (19)

Family Cites Families (59)

• 2005
  • 2005-01-26 DE DE102005003802A patent/DE102005003802A1/de not_active Withdrawn
  • 2005-06-15 US US11/721,125 patent/US20090126628A1/en not_active Abandoned
  • 2005-12-06 WO PCT/EP2005/056543 patent/WO2006061391A2/fr not_active Ceased
  • 2005-12-06 EP EP10184168A patent/EP2283933A3/fr not_active Withdrawn
  • 2005-12-06 AT AT05845527T patent/ATE516889T1/de active
  • 2005-12-06 PL PL05845527T patent/PL1725341T3/pl unknown
  • 2005-12-06 RU RU2007121324/11A patent/RU2403988C2/ru not_active IP Right Cessation
  • 2005-12-06 EP EP05845527A patent/EP1725341B1/fr not_active Expired - Lifetime

Non-Patent Citations (1)

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