EP0154265A1 - Apparatus for drying coated articles by infra-red radiation - Google Patents

Apparatus for drying coated articles by infra-red radiation Download PDF

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Publication number
EP0154265A1
EP0154265A1 EP85101940A EP85101940A EP0154265A1 EP 0154265 A1 EP0154265 A1 EP 0154265A1 EP 85101940 A EP85101940 A EP 85101940A EP 85101940 A EP85101940 A EP 85101940A EP 0154265 A1 EP0154265 A1 EP 0154265A1
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EP
European Patent Office
Prior art keywords
zone
workpieces
housing
reflectors
zones
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EP85101940A
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German (de)
French (fr)
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EP0154265B1 (en
Inventor
Adolf Berkmann
Walter Veyhle
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Priority to AT85101940T priority Critical patent/ATE34457T1/en
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    • 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
    • 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 drying coated workpieces by infrared radiation and a device for performing the method.
  • the invention can be used particularly advantageously for gelling (drying) powder-coated castings, in particular also of gray castings, even with an irregular shape.
  • the invention can also be advantageous for thin-walled workpieces of complicated configuration, among others.
  • made of BLech can be used.
  • the workpieces can also be coated with an electrodeposition, water-soluble or solvent-based lacquer. Coated workpieces made of ceramic or glass can also be dried.
  • a furnace is known from US Pat. No. 2,419,643, in the housing of which infrared radiators with reflectors are arranged at a distance from the housing walls.
  • the infrared emitters enclose a radiation room.
  • the housing has inlet and outlet openings and a means of transport for transporting the workpieces through the housing. After entering the housing, the workpieces enter a zone in which the infrared heaters are arranged close together are, so that the workpieces are quickly heated to the desired drying temperature by the intensive direct irradiation.
  • the oven When passing through the oven further, the drying temperature reached only needs to be maintained, for which a smaller number of emitters is sufficient, so that the oven has a second zone with infrared emitters arranged at a greater distance from one another than in the first heating zone of the case.
  • a suction device e.g. also to remove vapors generated during drying to extract air.
  • coated castings of irregular shape cannot be dried or treated in such ovens, since burns of the coating on protruding parts on the one hand and insufficient drying or treatment results with undercuts and on parts lying in the shadow of the IR rays, on the other hand, can be observed.
  • the convective heat component is completely passed on to the atmosphere unused.
  • the object of the invention is to provide a method by means of which workpieces - in particular also workpieces coated with powder, but also with liquid lacquers - can also be dried with an irregular shape and with undercuts by IR radiation.
  • the object of the invention is also to provide an economical device for carrying out the method.
  • the workpieces are heated by the radiation, whereby protruding parts are cooled by the circulated air - which prevents overheating and parts that are only irradiated less and thus can absorb less radiation energy are heated.
  • heat is balanced within the workpieces, which is reinforced by the flow flowing around the workpieces in this zone as well. Due to the heat balance within the workpieces, the positions lying in the radiation shade, which absorb less radiation energy, are supplied with the required thermal energy for drying and the energy used is used more economically.
  • the air circulation can also cool the reflectors of the radiators and the housing walls and use their heat to treat the workpieces, which saves energy.
  • Maintaining a negative pressure enables the desired flow conditions to be maintained for washing around the workpieces and prevents e.g. Dust particles of a powder coating can escape to the outside.
  • the diffuse infrared radiation distribution and the resulting "billiard effect" also enable undercuts and recesses to be achieved and concentrations on certain projecting parts to be prevented, thus contributing to more uniform heating on all sides.
  • the device has a known, tunnel-tube-shaped housing 1, which has an inlet and outlet opening 2, 3 on the end faces.
  • a transport means 4 is guided through the inlet and outlet opening 2, 3 and the housing 1, with which workpieces 5 coated with a lacquer can be transported through the device.
  • the interior of the housing 1 is divided into three interconnected zones 6, 7, 8, a preheating, a resting and a post-heating zone.
  • the length of the zones is in principle arbitrary.
  • the preheating zone 6 can be longer, since the workpieces are heated to the working temperature here, or the same length as the reheating zone 8.
  • a ratio of zones 6, 7, 8 to one another would be e.g. 2: 2: 1, 2: 1: 1 or 2: 1: 2 or 1: 1: 1.
  • the working cross section which depends on the dimensions of the respective workpieces 5, is provided with enveloping reflectors 9, which extend parallel to the transport direction.
  • the reflectors 9 are arranged at least at a distance from the workpiece 5, but preferably also adjustable in angle, and form the walls of the actual irradiation rooms.
  • a plurality of reflectors 9 can be connected to form reflector walls 10, 10 'and can be jointly adjustable in distance.
  • the shape of the reflector envelope and thus the cross-section of the irradiation rooms depend on the shape of the workpieces 5 and should adapt to their enveloping ends.
  • Right-angled arrangements of the reflector walls 10, 10 ' are possible. Because of the better adaptability to different workpieces 5 and with regard to the better diffuse beam distribution, arrangements in the form of a hexagon as in the exemplary embodiment, or a triangle, pentagon, etc. are preferable.
  • the lateral reflector walls 10 are arranged in parallel and the upper and lower reflector walls 10 ′ are arranged to be movable about an axis 11. If necessary, the walls 10 can also be arranged in parallel and at the same time pivoted, which makes arrangements in pyramid shape possible.
  • the reflectors 9 are at a - preferably adjustable - side distance from each other, so that there are passage gaps between them, connected to the reflector walls 10, e.g. they are arranged on supports 12 so as to be displaceable and detachable, lockable and removable.
  • the side spacing and thus the passage gap between them can easily be increased or decreased and, if necessary, further reflectors can be attached to or removed from the carriers 12 in order to be able to adapt the radiation chambers enveloped by the reflectors 9 to different dimensions of workpieces 5.
  • the active side of the reflectors 9 is directed towards the workpieces 5 and consists of a high-gloss layer, e.g. anodized aluminum and is preferably spatially structured, e.g. through pyramids with regular or irregular three-, four-, five-, hexagonal, etc. bases.
  • the reflectors 9 have the task of diffusely distributing the rays from IR emitters 13 in the irradiation area, they should under no circumstances focus them.
  • the infrared radiators 13 are arranged in the central axis of individual or all reflectors 9. Between the inner wall 14 of the housing 1, the side walls of the quiet zone 7 and the rear sides of the reflectors 9 there are 10 channels 15 of different volumes according to the respective position of the reflector walls.
  • the walls of the channels 15 are aerodynamically shaped in order to ensure a uniform, preferably vortex-free laminar flow in the channels 15.
  • the right-hand and left-hand channels 15 are separated from one another in the upper region by partition walls 16 surrounding the means of transport 4. In the lower area, they open into a common pressure chamber 17, which is covered toward the channels 15 by plates 18 or grids having openings.
  • the channels 15 on the right and left sides can also be completely separated from one another in the lower region, the pressure chamber 17 being integrated.
  • the plates 18 or grids can also be dispensed with.
  • suction openings 19 of a fan 20 are made.
  • the pressure side of the ventilator 20 is connected to the pressure chambers 17 of the preheating zone 6 and the post-heating zone 8.
  • the channels 15 have in the upper closed part between the partition 16 and the housing side wall with throttles provided exhaust air nozzles 21, which can be used to regulate the temperature of the atmosphere inside the device and, if necessary, to extract vapors.
  • the inner wall of the furnace behind is protected from direct radiation protected and due to the generated flow conditions, they are also cooled. Due to the flow conditions inside, the reflectors are also protected against the deposit of SpaLt and crack products.
  • the wall of the housing 1 of the quiet zone 7 and also in the inlet zone 22 located between the inlet opening 2 and the preheating zone 6 and in the outlet zone 23 located between the reheating zone 8 and the outlet opening 3 consists of a material which practically does not absorb infrared radiation.
  • this wall can be made of a high-gloss layer, e.g. anodized aluminum and also be spatially structured. This allows the billiard effect to direct vagabonding infrared rays back to the workpiece and, in conjunction with the air flow in the housing, avoids any significant heating of the wall, which makes special insulation unnecessary.
  • the IR radiators 13, controlled by a pilot radiator are raised and achieve their normal output when the workpiece 5 enters the irradiation area of the preheating zone 6. Due to the type and arrangement of the reflectors 9, the radiation of the IR radiators 13 is diffusely distributed in the irradiation area and thus also partially reflected by other reflectors 9 before they reach the workpiece 5. These reflections can also be used to achieve undercuts and depressions that would be in the shade in the case of a straight beam path. This and the above-mentioned flow around achieve a more uniform heating. The workpiece 5 then arrives in the rest zone 7 without an IR emitter.
  • a device of the type described was equipped with medium-wave twin-tube IR quartz emitters with an eight-shaped cross-section and covered with a gold layer on the back and with reflectors with a spatially structured reflector surface made of high-gloss anodized aluminum.
  • the side distance between the neighboring reflectors was 1.5 mm, that between the central axes of the IR emitters was 65 mm.
  • the area power of the radiators was between 30 and 36 kW / m 2.
  • the idle power was 10% of the installed power.
  • Powder-coated cast workpieces (for example made of gray cast iron), some with complicated shapes, were passed through the device at a speed of 1 m / min without rotation of the workpieces. In the specific example, the workpieces remained in the preheating zone for 2 minutes, in the rest zone for 1 minute and in the post-heating zone for 1 to 1.5 minutes. After 2 minutes, melting of the powder was observed on the sides directly facing the emitters. At this moment the rest zone should be reached.
  • the temperature in the preheating zone and the post-heating zone was limited to 200 ° C.
  • air can also be discharged through the exhaust air connector 21, which requires a stronger suction of ambient air through the inlet or outlet openings 2, 3.
  • a low negative pressure of approx. 10 Pa was maintained in the irradiation rooms and in the rest zone 7, and a slight positive pressure of 500 Pa was maintained in the channels 15.
  • By the generated flow and omitting the IR radiators is lower by about 30 0 C temperature was held in the rest zone. 7

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

PCT No. PCT/EP85/00066 Sec. 371 Date Oct. 24, 1985 Sec. 102(e) Date Oct. 24, 1985 PCT Filed Feb. 22, 1985 PCT Pub. No. WO85/03766 PCT Pub. Date Aug. 29, 1985.The present invention relates to a process for drying coated workpieces, particularly workpieces of irregular shape, by infrared radiation and to an apparatus for carrying out this process. The present invention can be used for drying castings, particularly those having an irregular shape, thin-walled sheet-metal products as well as ceramic and glass products which have been coated with a powder or an electro-dipping varnish or water-soluble or solvent-containing varnishes. According to said process the workpieces are dried by infrared radiation in several zones at a specific temperature, an air flow being provided in the zones and the air being drawn off from one zone. According to the present invention the workpieces are preheated in the first preheating zone. In the second rest zone the infrared radiation is interrupted so that the temperature of the workpieces slightly decreases. In the third reheating zone the workpieces are completely dried by subjecting them once more to infrared radiation while the air is circulated and heat is additionally supplied to the workpieces by convection. The apparatus comprises a casing, wherein infrared emitters having reflectors are disposed in several zones at intervals from the casing walls, the emitters encompassing an irradiation space. The apparatus also has inlet and outlet openings and a means for conveying the workpieces through the casing and a suction device. According to the present invention a rest zone without any infrared emitters is disposed between a preheating zone and a reheating zone. The suction device in the rest zone is so disposed that the air is circulated within the casing.

Description

Die Erfindung betrifft ein Verfahren zum Trocknen von beschichteten Werkstücken durch InfrarotstrahLung und eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for drying coated workpieces by infrared radiation and a device for performing the method.

Die Erfindung kann besonders vorteilhaft zum AusgeLieren (Trocknen) von pulverbeschichteten Gußstücken, insbesondere auch von Graugußstücken gerade auch mit unregelmäßiger Gestalt eingesetzt werden. Die Erfindung kann aber auch vorteilhaft bei dünnwandigen Werkstücken komplizierter Konfiguration u.a. aus BLech verwendet werden. Die Beschichtung der Werkstücke kann auch durch einen Elektrotauch-, einen wasserlöslichen oder einen LösungsmitteLhaLtigen Lack erfolgt sein. Es Lassen sich auch beschichtete Werkstücke aus Keramik oder GLas trocknen.The invention can be used particularly advantageously for gelling (drying) powder-coated castings, in particular also of gray castings, even with an irregular shape. However, the invention can also be advantageous for thin-walled workpieces of complicated configuration, among others. made of BLech can be used. The workpieces can also be coated with an electrodeposition, water-soluble or solvent-based lacquer. Coated workpieces made of ceramic or glass can also be dried.

Aus der US-PS 2 419 643 ist ein Ofen bekannt, in dessen Gehäuse im Abstand von den Gehäusewänden InfrarotstrahLer mit Reflektoren angeordnet sind. Die InfrarotstrahLer schließen einen BestrahLungsraum ein. Das Gehäuse weist Ein- und Auslaßöffnungen sowie ein Transportmittel zum Transport der Werkstücke durch das Gehäuse auf. Die Werkstücke gelangen nach dem Eintritt in das Gehäuse in eine Zone, in der die InfrarotstrahLer eng beieinander angeordnet sind, so daß durch die intensive direkte Bestrahlung die Werkstücke schneLL auf die gewünschte Trockentemperatur aufgeheizt werden. Beim weiteren Durchgang durch den Ofen braucht die erreichte Trockentemperatur nur noch aufrechterhalten werden, wozu eine geringere AnzahL an StrahLern ausreicht, so daß der Ofen eine zweite Zone mit in größerem Abstand voneinander angeordneten InfrarotstrahLern aufweist als dies in der ersten Aufheizzone der FaLL ist.A furnace is known from US Pat. No. 2,419,643, in the housing of which infrared radiators with reflectors are arranged at a distance from the housing walls. The infrared emitters enclose a radiation room. The housing has inlet and outlet openings and a means of transport for transporting the workpieces through the housing. After entering the housing, the workpieces enter a zone in which the infrared heaters are arranged close together are, so that the workpieces are quickly heated to the desired drying temperature by the intensive direct irradiation. When passing through the oven further, the drying temperature reached only needs to be maintained, for which a smaller number of emitters is sufficient, so that the oven has a second zone with infrared emitters arranged at a greater distance from one another than in the first heating zone of the case.

Es ist auch vorgesehen, im Gehäuse eine durchziehende Luftströmung zu erzeugen oder aus dem zentralen Gehäuseteil mittels einer Ansaugvorrichtung, z.B. auch zur Entfernung von beim Trocknen entstehenden Dämpfen, Luft abzusaugen.It is also envisaged to generate a continuous air flow in the housing or from the central housing part by means of a suction device, e.g. also to remove vapors generated during drying to extract air.

In derartigen öfen Lassen sich jedoch beschichtete Gußstücke unregelmäßiger Form nicht trocknen bzw. behandeln, da einerseits Verbrennungen der Beschichtung an vorstehenden TeiLen und andererseits ungenügende Trocken- bzw. Behandlungsergebnisse bei Hinterschnitten und an im Schatten der IR-Strahlen Liegenden Partien zu beobachten sind. Der konvektive Wärmeanteil wird hierbei voLLständig unausgenutzt an die Atmosphäre weitergegeben.However, coated castings of irregular shape cannot be dried or treated in such ovens, since burns of the coating on protruding parts on the one hand and insufficient drying or treatment results with undercuts and on parts lying in the shadow of the IR rays, on the other hand, can be observed. The convective heat component is completely passed on to the atmosphere unused.

Aufgabe der Erfindung ist es, ein Verfahren anzugeben, mit dem Werkstücke - insbesondere auch mit PuLver, aber auch mit flüssigen Lacken beschichtete Werkstücke - auch von unregelmäßiger GestaLt und mit Hinterschnitten durch IR-StrahLung getrocknet werden können. Aufgabe der Erfindung ist es auch, eine wirtschaftliche Vorrichtung zur Durchführung des Verfahrens anzugeben.The object of the invention is to provide a method by means of which workpieces - in particular also workpieces coated with powder, but also with liquid lacquers - can also be dried with an irregular shape and with undercuts by IR radiation. The object of the invention is also to provide an economical device for carrying out the method.

Die Aufgabe wird durch ein Verfahren mit den MerkmaLen des Anspruchs 1 gelöst.The object is achieved by a method having the features of claim 1.

In der ersten und dritten Zone werden die Werkstücke durch die StrahLung erhitzt, wobei durch die umgewälzte Luft vorstehende TeiLe gekühlt - was überhitzungen ausschließt und Teile, die nur geringer bestrahlt werden und damit weniger Strahlungsenergie aufnehmen können,erwärmt werden. In der Ruhezone ohne Infrarotstrahlung erfolgt ein Wärmeausgleich innerhalb der Werkstücke, der durch die auch in dieser Zone die Werkstücke umfließenden Strömung verstärkt wird. Durch den Wärmeausgleich innerhalb der Werkstücke wird auch den im StrahLungsschatten Liegenden SteLLen, die weniger Strahlungsenergie aufnehmen, die erforderliche Wärmeenergie zum Trocknen zugeführt und die eingesetzte Energie wirtschaftlicher genutzt. Durch die LuftumwäLzung lassen sich auch die Reflektoren der StrahLer und die Gehäusewände kühlen und deren aufgenommene Wärme zur BehandLung der Werkstücke ausnutzen, was Energie spart.In the first and third zones, the workpieces are heated by the radiation, whereby protruding parts are cooled by the circulated air - which prevents overheating and parts that are only irradiated less and thus can absorb less radiation energy are heated. In the rest zone without infrared radiation, heat is balanced within the workpieces, which is reinforced by the flow flowing around the workpieces in this zone as well. Due to the heat balance within the workpieces, the positions lying in the radiation shade, which absorb less radiation energy, are supplied with the required thermal energy for drying and the energy used is used more economically. The air circulation can also cool the reflectors of the radiators and the housing walls and use their heat to treat the workpieces, which saves energy.

In den Unteransprüchen 2 bis 3 sind besonders vorteilhafte Weiterbildungen des Verfahrens wiedergegeben.Particularly advantageous developments of the method are given in subclaims 2 to 3.

Die AufrechterhaLtung eines Unterdrucks ermöglicht die Einhaltung der gewünschten Strömungsverhältnisse zur Umspülung der Werkstücke und verhindert, daß z.B. Staubpartikel einer PuLverbeschichtung nach außen gelangen können.Maintaining a negative pressure enables the desired flow conditions to be maintained for washing around the workpieces and prevents e.g. Dust particles of a powder coating can escape to the outside.

Die diffuse Infrarotstrahlenverteilung und der dadurch erzielte "Billiardeffekt" ermöglicht auch Hinterschnitte und Vertiefungen zu erreichen und Konzentrationen auf bestimmte vorspringende TeiLe zu verhindern, sie trägt somit zur gleichmäßigeren allseitigen Erwärmung bei.The diffuse infrared radiation distribution and the resulting "billiard effect" also enable undercuts and recesses to be achieved and concentrations on certain projecting parts to be prevented, thus contributing to more uniform heating on all sides.

Die Aufgabe wird auch durch eine Vorrichtung mit den Merkmalen des Anspruchs 4 gelöst.The object is also achieved by a device with the features of claim 4.

Vorzugsweise AusgestaLtungen der Vorrichtung sind den Unteransprüchen zu entnehmen.Preferences of the device can be found in the subclaims.

Nachstehend wird die Erfindung anhand eines Ausführungsbeispiels einer Vorrichtung unter Hinweis auf Varianten und unter Angabe weiterer VorteiLe unter Bezug auf Zeichnungen näher erläutert. Es zeigt:

  • Fig. 1 in schematischer DarsteLLung einen Längsschnitt durch eine Vorrichtung gemäß der Erfindung,
  • Fig. 2 in schematischer DarsteLLung einen Schnitt durch die Vorrichtung gemäß Fig. 1 entlang der Linie II-II.
The invention is described below using an exemplary embodiment of a device with reference to variants and explained further details with reference to drawings. It shows:
  • 1 is a schematic representation of a longitudinal section through a device according to the invention,
  • Fig. 2 is a schematic representation of a section through the device of FIG. 1 along the line II-II.

ALs AusführungsbeispieL wird eine Vorrichtung zum AusgeLieren von pulverbeschichteten GußteiLen erläutert.As an exemplary embodiment, a device for gelling powder-coated castings is explained.

Die Vorrichtung weist ein bekanntes, tunnelrohrförmiges Gehäuse 1 auf, das an den Stirnseiten eine Ein- bzw. AusLaßöffnung 2,3 aufweist. Durch die Ein- und Austaßöffnung 2,3 und das Gehäuse 1 ist ein Transportmittel 4 geführt, mit dem mit einem Lack beschichtete Werkstücke 5 durch die Vorrichtung transportiert werden können.The device has a known, tunnel-tube-shaped housing 1, which has an inlet and outlet opening 2, 3 on the end faces. A transport means 4 is guided through the inlet and outlet opening 2, 3 and the housing 1, with which workpieces 5 coated with a lacquer can be transported through the device.

Das Innere des Gehäuses 1 ist in Längserstreckung in drei miteinander verbundene Zonen 6,7,8, eine Vorwärm-, eine Ruhe- und eine Nachheizzone unterteilt. Die Länge der Zonen ist prinzipiell beliebig. Die Vorwärmzone 6 kann Länger, da hier das Aufheizen der Werkstücke auf die Arbeitstemperatur erfolgt, oder auch gleich Lang wie die Nachheizzone 8 ausgeführt werden. Ein VerhäLtnis der Zonen 6,7,8 zueinander wäre z.B. 2:2:1, 2:1:1 oder 2:1:2 oder auch 1:1:1.The interior of the housing 1 is divided into three interconnected zones 6, 7, 8, a preheating, a resting and a post-heating zone. The length of the zones is in principle arbitrary. The preheating zone 6 can be longer, since the workpieces are heated to the working temperature here, or the same length as the reheating zone 8. A ratio of zones 6, 7, 8 to one another would be e.g. 2: 2: 1, 2: 1: 1 or 2: 1: 2 or 1: 1: 1.

Bei einem äußerst komplizierten Werkstück 5 mit vielen Hinterschnitten und Vertiefungen kann es auch notwendig sein, mehrere - gegebenenfalls dann kürzere - Ruhe- und Nachheizzonen 7,8 vorzusehen. Diese können innerhalb des Gehäuses 1 angeordnet sein (nicht dargestellt) oder in separaten, bedarfsweise an das Gehäuse 1 ankuppelbaren Gehäusen 1' (in Fig. 1 angedeutet) angeordnet werden. Diese Gehäuse 1' können auch verfahrbar gestaltet sein.In the case of an extremely complicated workpiece 5 with many undercuts and depressions, it may also be necessary to provide several rest and reheating zones 7, 8, which may be shorter. These can be arranged within the housing 1 (not shown) or can be arranged in separate housings 1 '(which can be coupled to the housing 1 as required) (indicated in FIG. 1). These housings 1 'can also be designed to be movable.

In der Vorwärmzone 6 und der Nachheizzone 8 sind den Arbeitsquerschnitt, der von den Abmessungen der jeweiligen Werkstücke 5 abhängt, einhüllende Reflektoren 9 angeordnet, die sich parallel zur Transportrichtung erstrecken. Die Reflektoren 9 sind mindestens in ihrem Abstand zum Werkstück 5,vorzugsweise aber auch winkelverstellbar angeordnet und bilden die Wände der eigentlichen BestrahLungsräume. Mehrere RefLektoren 9 können zu Reflektorwänden 10,10' verbunden und gemeinsam abstandsverstellbar sein. GrundsätzLich ist die Form der Reflektoreinhüllung und damit der Querschnitt der Bestrahlungsräume von der Form der Werkstücke 5 abhängig und soll sich deren UmhüLLenden anpassen. Es sind rechtwinklige Anordnungen der Reflektorwände 10,10' möglich. Wegen der besseren AnpassungsmögLichkeiten an verschiedene Werkstücke 5 und hinsichtlich der besseren diffusen Strahlenverteilung sind Anordnungen in Form eines Sechsecks wie im AusführungsbeispieL, oder eines Dreiecks, Fünfecks usw.vorzuziehen.In the preheating zone 6 and the reheating zone 8, the working cross section, which depends on the dimensions of the respective workpieces 5, is provided with enveloping reflectors 9, which extend parallel to the transport direction. The reflectors 9 are arranged at least at a distance from the workpiece 5, but preferably also adjustable in angle, and form the walls of the actual irradiation rooms. A plurality of reflectors 9 can be connected to form reflector walls 10, 10 'and can be jointly adjustable in distance. Basically, the shape of the reflector envelope and thus the cross-section of the irradiation rooms depend on the shape of the workpieces 5 and should adapt to their enveloping ends. Right-angled arrangements of the reflector walls 10, 10 'are possible. Because of the better adaptability to different workpieces 5 and with regard to the better diffuse beam distribution, arrangements in the form of a hexagon as in the exemplary embodiment, or a triangle, pentagon, etc. are preferable.

Beim Ausführungsbeispiel sind die seitlichen RefLektorwände 10 parallel und die oberen und unteren Reflektorwände 10' um eine Achse 11 bewegbar angeordnet. GegebenenfaLLs können die Wände 10 auch parallel verstellbar und zugleich verschwenkbar angeordnet sein, wodurch Anordnungen in Pyramidenform möglich sind. Die RefLektoren 9 sind mit einem - vorzugsweise einstellbaren - Seitenabstand voneinander, so daß zwischen ihnen Durchgangsspalte bestehen, zu den Reflektorwänden 10 verbunden, z.B. sind sie auf Trägern 12 verschieb- und Lös-, arretier- und entfernbar angeordnet. Dadurch kann Leicht der Seitenabstand und damit der Durchgangsspalt zwischen ihnen vergrößert oder verkleinert werden und gegebenenfaLLs können weitere RefLektoren an den Trägern 12 befestigt oder von ihnen abgenommen werden, um die durch die RefLektoren 9 umhüllten BestrahLungsräume an verschiedene Abmessungen von Werkstücken 5 anpassen zu können.In the exemplary embodiment, the lateral reflector walls 10 are arranged in parallel and the upper and lower reflector walls 10 ′ are arranged to be movable about an axis 11. If necessary, the walls 10 can also be arranged in parallel and at the same time pivoted, which makes arrangements in pyramid shape possible. The reflectors 9 are at a - preferably adjustable - side distance from each other, so that there are passage gaps between them, connected to the reflector walls 10, e.g. they are arranged on supports 12 so as to be displaceable and detachable, lockable and removable. As a result, the side spacing and thus the passage gap between them can easily be increased or decreased and, if necessary, further reflectors can be attached to or removed from the carriers 12 in order to be able to adapt the radiation chambers enveloped by the reflectors 9 to different dimensions of workpieces 5.

Die Wirkseite der Reflektoren 9 ist auf die Werkstücke 5 gerichtet und besteht aus einer hochglänzenden Schicht, z.B. eloxiertem Aluminium und ist vorzugsweise räumlich strukturiert, z.B. durch Pyramiden mit regel- oder unregelmäßiger drei-, vier-, fünf-, sechseckiger usw. Basis. Die RefLektoren 9 haben die Aufgabe, die StrahLen von IR-StrahLern 13 diffus im BestrahLungsraum zu verteilen, sie solLen sie auf keinen Fall fokussieren. Die InfrarotstrahLer 13 sind in der ZentraLachse einzelner oder aller RefLektoren 9 angeordnet. Zwichen der Innenwand 14 des Gehäuses 1, den Seitenwänden der Ruhezone 7 und den Rückseiten der RefLektoren 9 bestehen entsprechend der jeweiligen SteLLung der Reflektorwände 10 KanäLe 15 unterschiedlichen VoLumens.The active side of the reflectors 9 is directed towards the workpieces 5 and consists of a high-gloss layer, e.g. anodized aluminum and is preferably spatially structured, e.g. through pyramids with regular or irregular three-, four-, five-, hexagonal, etc. bases. The reflectors 9 have the task of diffusely distributing the rays from IR emitters 13 in the irradiation area, they should under no circumstances focus them. The infrared radiators 13 are arranged in the central axis of individual or all reflectors 9. Between the inner wall 14 of the housing 1, the side walls of the quiet zone 7 and the rear sides of the reflectors 9 there are 10 channels 15 of different volumes according to the respective position of the reflector walls.

Die Wände der KanäLe 15 sind strömungsgünstig geformt, um eine gleichmäßige, möglichst wirbelfreie Laminare Strömung in den Kanäten 15 zu gewährleisten. Die rechts- und Linksseitigen KanäLe 15 sind im oberen Bereich durch das Transportmittel 4 umgebende Trennwände 16 voneinander getrennt. Im unteren Bereich münden sie in einen gemeinsamen Druckraum 17, der zu den KanäLen 15 hin durch öffnungen aufweisende PLatten 18 oder Gitter abgedeckt ist. Die KanäLe 15 der rechten und Linken Seite können auch im unteren Bereich völlig voneinander getrennt sein, wobei der Druckraum 17 integriert ist. Auf die PLatten 18 oder Gitter kann auch verzichtet werden.The walls of the channels 15 are aerodynamically shaped in order to ensure a uniform, preferably vortex-free laminar flow in the channels 15. The right-hand and left-hand channels 15 are separated from one another in the upper region by partition walls 16 surrounding the means of transport 4. In the lower area, they open into a common pressure chamber 17, which is covered toward the channels 15 by plates 18 or grids having openings. The channels 15 on the right and left sides can also be completely separated from one another in the lower region, the pressure chamber 17 being integrated. The plates 18 or grids can also be dispensed with.

Am Boden der Ruhekammer 7 sind Ansaugöffnungen 19 eines Ventilators 20 ausgeführt. Die Druckseite des VentiLators 20 ist mit den Druckräumen 17 der Vorwärmzone 6 und der Nachheizzone 8 verbunden.At the bottom of the rest chamber 7, suction openings 19 of a fan 20 are made. The pressure side of the ventilator 20 is connected to the pressure chambers 17 of the preheating zone 6 and the post-heating zone 8.

Die KanäLe 15 weisen im oberen geschlossenen TeiL zwischen der Trennwand 16 und der Gehäuseseitenwand mit DrosseLn versehene AbLuftstutzen 21 auf, die zur TemperaturregeLung der Atmosphäre im Innern der Vorrichtung und gegebenenfalls zum Absaugen von Dämpfen dienen können.The channels 15 have in the upper closed part between the partition 16 and the housing side wall with throttles provided exhaust air nozzles 21, which can be used to regulate the temperature of the atmosphere inside the device and, if necessary, to extract vapors.

Durch die dargelegte Anordnung der RefLektoren 9 wird die dahinterliegende Ofeninnenwand vor einer direkten StrahLung geschützt und durch die erzeugten Strömungsverhältnisse erfolgt auch deren Kühlung. Durch die erzielten Strömungsverhältnisse im Innern werden die Reflektoren auch vor der Ablagerung von SpaLt- und Crackprodukten geschützt.Due to the arrangement of the reflectors 9 shown, the inner wall of the furnace behind is protected from direct radiation protected and due to the generated flow conditions, they are also cooled. Due to the flow conditions inside, the reflectors are also protected against the deposit of SpaLt and crack products.

Vorzugsweise besteht die Wandung des Gehäuses 1 der Ruhezone 7 und auch in der sich zwischen der Einlaßöffnung 2 und der Vorwärmzone 6 befindenden EinLaßzone 22 sowie in der sich zwischen der Nachheizzone 8 und der Auslaßöffnung 3 befindenden Auslaßzone 23 aus einem die Infrarotstrahlung praktisch nicht absorbierenden Material. Diese Wandung kann wie die Reflektoren aus einer hochglänzenden Schicht, z.B. eloxiertem Aluminium bestehen und ebenso räumlich strukturiert sein. Hierdurch Lassen sich durch den Billiardeffekt durch das Gehäuse vagabundierende Infrarotstrahlen zurück auf das Werkstück Lenken und es wird dadurch in Verbindung mit der Luftströmung im Gehäuse eine nennenswerte Aufheizung der Wandung vermieden, die spezielle IsoLationen unnötig macht.Preferably, the wall of the housing 1 of the quiet zone 7 and also in the inlet zone 22 located between the inlet opening 2 and the preheating zone 6 and in the outlet zone 23 located between the reheating zone 8 and the outlet opening 3 consists of a material which practically does not absorb infrared radiation. Like the reflectors, this wall can be made of a high-gloss layer, e.g. anodized aluminum and also be spatially structured. This allows the billiard effect to direct vagabonding infrared rays back to the workpiece and, in conjunction with the air flow in the housing, avoids any significant heating of the wall, which makes special insulation unnecessary.

Das erfindungsgemäße Verfahren Läuft in der beschriebenen Vorrichtung wie folgt ab:

  • Vor der Inbetriebnahme werden der Abstand der RefLektoren 9 bzw. der Reflektorwände 10,10' entsprechend der Größe des zu behandelnden Werkstücks 5 und dem optimalen Wirkabstand der verwendeten IR-Strahler 13 eingestellt. Entsprechend der GestaLt und Beschaffenheit des Werkstücks 5 und der Beschichtung sowie der davon abhängigen benötigten Wärmemenge werden die AnzahL, die VerteiLung und die Art der InfrarotstrahLer 13 gewählt und entsprechend auch der Abstand der RefLektoren 9 voneinander. Werden immer gleiche oder gleichartige Gegenstände der Behandlung unterzogen, wird diese Einstellung nur einmal bei der Inbetriebnahme vorgenommen. Mittelwellige InfrarotstrahLer mit einer Wellenlänge von λ 2 bis 3 haben sich besonders bewährt.
The method according to the invention proceeds in the device described as follows:
  • Before the start-up, the distance between the reflectors 9 and the reflector walls 10, 10 'is set according to the size of the workpiece 5 to be treated and the optimum effective distance of the IR radiators 13 used. The number, the distribution and the type of infrared radiators 13 are selected in accordance with the shape and nature of the workpiece 5 and the coating, as well as the amount of heat required, and the distance between the reflectors 9 from one another. If the same or similar items are always subjected to the treatment, this setting is only made once during commissioning. Medium-wave infrared emitters with a wavelength of λ 2 to 3 have proven particularly useful.

Sodann wird ein TeiL der vorgesehenen IR-Strahler 13 oder alle - mit reduzierter Leistung - sowie der Ventilator 20 eingeschaltet. Hierdurch wird im Vorrichtungsinnern die jeweils benötigte LeerLauftemperatur eingestellt. Durch die beschriebene Anordnung des VentiLators 20 stellt sich in der Ruhezone 7 und auch in den Bestrahlungsräumen der Vorwärm- und Nachheizzonen 6,8 ein Unterdruck ein, während sich in den KanäLen 15 ein überdruck aufbaut. Hierdurch bildet sich eine Strömung aus den KanäLen 15, die die Reflektoren 9 umfließend in die Bestrahlungsräume hinein und um die Werkstücke 5 herum in die Ruhezone 7 aus. Durch diese Strömung werden die RefLektoren 9 gekühlt und Anteile der konvektiven Wärme für die BehandLung der Werkstücke 5 gewonnen. Die Strömungsbewegung ist mit PfeiLen in den Figuren angedeutet.Then a part of the provided IR radiators 13 or all - with reduced power - and the fan 20 are switched on. This sets the required idle temperature inside the device. The arrangement of the ventilator 20 described results in a vacuum in the rest zone 7 and also in the irradiation rooms of the preheating and post-heating zones 6, 8, while an overpressure builds up in the channels 15. This forms a flow from the channels 15, which flows around the reflectors 9 into the radiation chambers and around the workpieces 5 into the rest zone 7. This flow cools the reflectors 9 and generates portions of the convective heat for the treatment of the workpieces 5. The flow movement is indicated by arrows in the figures.

Wird durch einen MeLder ein Werkstück 5 avisiert, werden die IR-StrahLer 13, gesteuert durch einen Pilotstrahler, hochgefahren und erreichen beim Eintritt des Werkstücks 5 in den Bestrahtungsraum der Vorwärmzone 6 ihre normale Leistung. Durch die Art und Anordnung der RefLektoren 9 wird die StrahLung der IR-StrahLer 13 im Bestrahlungsraum diffus verteilt und somit auch teilweise von anderen Reflektoren 9 reftektiert, bevor sie das Werkstück 5 erreichen. Durch diese Reflektionen können auch Hinterschnitte und Vertiefungen erreicht werden, die bei einem geradlinigen StrahLengang im Schatten Liegen würden. Hierdurch und durch das oben erwähnte Umströmen wird eine gleichmäßigere Erwärmung erzielt. Das Werkstück 5 gelangt dann in die Ruhezone 7 ohne IR-StrahLer. Hier erfolgt nicht nur keine Wärmezufuhr, sondern durch die Strömung eine geringe KühLung der Oberfläche, so daß die vom OberfLächenbereich aufgenommene Wärme ins Innere abfließen kann und im Sinne eines Temperaturausgleichs innerhalb des Werkstücks zwischen dick- und dünnwandigen Teilen wirkt. IrgendweLchen möglichen Verbrennungen durch Temperaturstaus wird somit wirksam vorgebaut. Außerdem erfolgt von innen heraus ein Temperaturfluß in die Zonen, wo die Strahlung nicht oder nur in geringem Maße die OberfLäche erreichen konnte, so daß auch die Qualität der Behandlung verbessert wird. In der Nachheizzone 8 erfolgt dann eine der in der Vorwärmzone 6 durchgeführten Behandlung entsprechende EndbehandLung. Bei VerLassen der Nachheizone 8 sind die Werkstücke 5 fertig behandelt, d.h. die Beschichtung ist vollständig und hochwertig ausgehärtet. Bei sehr komplizierten Werkstücken 5 können gegebenenfalls mehrere Ruhe- und Nachheizbehandlungen, die gegebenenfalls zeitlich verkürzt sind, durchgeführt werden.If a workpiece 5 is notified by a detector, the IR radiators 13, controlled by a pilot radiator, are raised and achieve their normal output when the workpiece 5 enters the irradiation area of the preheating zone 6. Due to the type and arrangement of the reflectors 9, the radiation of the IR radiators 13 is diffusely distributed in the irradiation area and thus also partially reflected by other reflectors 9 before they reach the workpiece 5. These reflections can also be used to achieve undercuts and depressions that would be in the shade in the case of a straight beam path. This and the above-mentioned flow around achieve a more uniform heating. The workpiece 5 then arrives in the rest zone 7 without an IR emitter. Here, not only is there no heat supply, but due to the flow there is a slight cooling of the surface, so that the heat absorbed by the surface area can flow off to the inside and act in the sense of temperature compensation within the workpiece between thick and thin-walled parts. Any possible burns due to temperature congestion will thus occur effectively built. In addition, there is a temperature flow from the inside into the zones where the radiation could not reach the surface or only to a small extent, so that the quality of the treatment is also improved. A final treatment corresponding to the treatment carried out in the preheating zone 6 then takes place in the reheating zone 8. When leaving the post-heating zone 8, the workpieces 5 are finished, ie the coating is completely and high-quality hardened. In the case of very complicated workpieces 5, several resting and post-heating treatments, which may be shortened in time, may be carried out.

B e i s p i e lExample

Eine Vorrichtung der beschriebenen Art wurde mit mittelwelligen Zwillingsrohr IR-Quarz-Strahlern mit achtförmigem Querschnitt und durch eine GoLdschicht abgedeckter Rückseite und mit RefLektoren mit einer räumlich strukturierten Reflektorfläche aus hochglänzendem eloxiertem Aluminium bestückt.A device of the type described was equipped with medium-wave twin-tube IR quartz emitters with an eight-shaped cross-section and covered with a gold layer on the back and with reflectors with a spatially structured reflector surface made of high-gloss anodized aluminum.

Der Seitenabstand zwischen den benachbarten Reflektoren betrug 1.5 mm, der zwischen den Zentralachsen der IR-Strahler 65 mm. Die Flächenleistung der StrahLer lag zwischen 30 und 36 kW/m2. Die Leerlaufleistung betrug 10% der installierten Leistung. Durch die Vorrichtung wurden pulverbeschichtete Gußwerkstücke (z.B. aus Grauguß), zum Teil mit komplizierten Formen, mit einer Geschwindigkeit von 1 m/min ohne Drehung der Werkstücke durchgeschleust. Beim konkreten Beispiel verblieben die Werkstücke 2 Minuten in der Vorwärmzone, 1 Minute in der Ruhezone und 1 bis 1,5 Minuten in der Nachheizzone. Nach 2 Minuten war ein Anschmelzen des PuLvers auf den direkt den Strahlern zugekehrten Seiten zu beobachten. In diesem Augenblick sollte die Ruhezone erreicht werden. Die Temperatur in der Vorwärmzone und der Nachheizzone wurde auf 200°C begrenzt.The side distance between the neighboring reflectors was 1.5 mm, that between the central axes of the IR emitters was 65 mm. The area power of the radiators was between 30 and 36 kW / m 2. The idle power was 10% of the installed power. Powder-coated cast workpieces (for example made of gray cast iron), some with complicated shapes, were passed through the device at a speed of 1 m / min without rotation of the workpieces. In the specific example, the workpieces remained in the preheating zone for 2 minutes, in the rest zone for 1 minute and in the post-heating zone for 1 to 1.5 minutes. After 2 minutes, melting of the powder was observed on the sides directly facing the emitters. At this moment the rest zone should be reached. The temperature in the preheating zone and the post-heating zone was limited to 200 ° C.

Zur kurzzeitigen RegeLung kann auch durch den Abluftstutzen 21 Luft abgeführt werden, was ein stärkeres Ansaugen von UmgebungsLuft durch die Eintritts- bzw. Austrittsöffnungen 2,3 bedingt. In den Bestrahlun*gsräumen und in der Ruhezone 7 wurde ein geringer Unterdruck von ca. 10 Pa und in den KanäLen 15 ein geringer überdruck von 500 Pa aufrechterhalten. Durch die erzielte Strömung und das WegLassen der IR-Strahler ergab sich in der Ruhezone 7 eine um ca. 300C niedrigere Temperatur.For short-term control, air can also be discharged through the exhaust air connector 21, which requires a stronger suction of ambient air through the inlet or outlet openings 2, 3. A low negative pressure of approx. 10 Pa was maintained in the irradiation rooms and in the rest zone 7, and a slight positive pressure of 500 Pa was maintained in the channels 15. By the generated flow and omitting the IR radiators is lower by about 30 0 C temperature was held in the rest zone. 7

Die beschichteten Werkstücke 5 wiesen nach dem Austritt aus der Vorrichtung und dem Abkühlen gleichmäßig ausge-Lierte hochwertige Beschichtungen auf.The coated workpieces 5, after exiting the device and cooling, had uniformly lined high-quality coatings.

Bei bekannten Trockenverfahren, die für Werkstücke aus Grauguß mit unregelmäßiger GestaLt geeignet sind, ist für gleiche Werkstücke eine Gesamtverweilzeit von 40 bis 45 Minuten erforderlich.In known drying processes, which are suitable for workpieces made of gray cast iron with an irregular shape, a total dwell time of 40 to 45 minutes is required for the same workpieces.

Claims (12)

1. Verfahren zum Trocknen von beschichteten Werkstücken - insbesondere von unregelmäßiger GestaLt - durch IR-StrahLung, wobei die Werkstücke in mehreren Zonen bei einer bestimmten Temperatur getrocknet werden und wobei in den Zonen eine Lufströmung vorgesehen ist und die Luft aus einer Zone abgeführt wird,
dadurch gekennzeichnet ,
daß die Werkstücke in der ersten Zone (Vorwärmzone) vorgewärmt werden, in der zweiten Zone (Ruhezone) die IR-Strahlung unterbrochen wird, so daß sich die Temperatur der Werkstücke leicht absenkt, und in der dritten Zone (Nachheizzone) durch erneute IR-Strahlung fertiggetrocknet werden, wobei die Luft umgewälzt wird und zusätzlich Wärme durch Konvektion an die Werkstücke abgibt.1. Method for drying coated workpieces - in particular of irregular shape - by means of IR radiation, the workpieces being dried in a plurality of zones at a specific temperature and an air flow being provided in the zones and the air being discharged from one zone,
characterized ,
that the workpieces are preheated in the first zone (preheating zone), the IR radiation is interrupted in the second zone (rest zone) so that the temperature of the workpieces drops slightly, and in the third zone (post-heating zone) by renewed IR radiation are finally dried, the air being circulated and additionally giving off heat to the workpieces by convection. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß in den Zonen ein geringer Unterdruck herrscht.2. The method according to claim 1, characterized in that there is a slight negative pressure in the zones. 3. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die Infrarotstrahlung diffus ist.3. The method according to any one of claims 1 and 2, characterized in that the infrared radiation is diffuse. 4. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 3 mit einem Gehäuse, in dem in mehreren Zonen im Abstand von den Gehäusewänden Infrarotstrahler mit Reflektoren angeordnet sind, die einen BestrahLungsraum einschließen, mit Ein- und Auslaßöffnungen sowie einem TransportmitteL zum Transport der Werkstücke durch das Gehäuse und mit einer Ansaugvorrichtung, dadurch gekennzeichnet, daß zwischen zwei Zonen (Vorwärmzone (6) und Nachheizzone (8)) eine Zone (Ruhezone (7)) ohne Infrarotstrahler (13) angeordnet ist und in der Ruhezone (7) die Ansaugvorrichtung (20) so angeordnet ist, daß die Luft innerhalb des Gehäuses (1) umgewälzt wird.4. Apparatus for carrying out the method according to one of claims 1 to 3 with a housing in which infrared radiators with reflectors are arranged in several zones at a distance from the housing walls, which enclose a radiation chamber, with inlet and outlet openings and a transport means for transporting the Workpieces through the housing and with a suction device, characterized in that between two Zones (preheating zone (6) and post-heating zone (8)) a zone (quiet zone (7)) without infrared radiator (13) is arranged and in the quiet zone (7) the suction device (20) is arranged so that the air inside the housing ( 1) is circulated. 5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die BestrahLungsräume einen der Form der Werkstücke (5) anpaßbaren veränderbaren Querschnitt aufweisen.5. The device according to claim 4, characterized in that the irradiation rooms have a variable cross-section adaptable to the shape of the workpieces (5). 6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß mindestens die parallel zu den Seitenwänden des Gehäuses (1) angeordneten Reflektoren (9) winkel- und/ oder abstandsverstellbar bezüglich der jeweils benachbarten Gehäuseseitenwand angeordnet sind.6. The device according to claim 5, characterized in that at least the parallel to the side walls of the housing (1) arranged reflectors (9) are arranged angle and / or distance adjustable with respect to the respective adjacent housing side wall. 7. Vorrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß benachbarte RefLektoren (9) mit einem größenänderbaren Seitenzwischenraum zueinander angeordnet sind.7. Device according to one of claims 4 to 6, characterized in that adjacent reflectors (9) are arranged with a resizable side space to each other. 8. Vorrichtung nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, daß die Innenwände des Gehäuses (1) mindestens teilweise aus einem die InfrarotstrahLer nicht absorbierenden Material bestehen.8. Device according to one of claims 4 to 7, characterized in that the inner walls of the housing (1) consist at least partially of a material which does not absorb the infrared radiators. 9. Vorrichtung nach einem der Ansprüche 4 bis 8, dadurch gekennzeichnet, daß die RefLektoren (9) und die Innenwände des Gehäuses (1) eine hochglänzende und räumlich strukturierte Wirkfläche aufweisen.9. Device according to one of claims 4 to 8, characterized in that the reflectors (9) and the inner walls of the housing (1) have a high-gloss and spatially structured active surface. 10. Vorrichtung nach einem der Ansprüche 4 bis 9, dadurch gekennzeichnet, daß zwischen der Gehäuseinnenwandung und der Rückseite der Reflektoren (9) ein KanaL (15) besteht, mit dem der Druckstutzen der Ansaugvorrichtung (20) verbunden ist.10. Device according to one of claims 4 to 9, characterized in that between the housing inner wall and the back of the reflectors (9) there is a channel (15) with which the pressure port of the suction device (20) is connected. 11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, daß die den Kanal (15) begrenzenden Rückseiten der Reflektoren (9) und die Gehäusewandung strömungsgünstig gestaltet sind.11. The device according to claim 10, characterized in that the channel (15) delimiting rear sides of the reflectors (9) and the housing wall are aerodynamically designed. 12. Vorrichtung nach Anspruch 10 oder 11, dadurch gekennzeichnet, daß der Kanal(15) druckseitig einen durch eine Drossel verschließbaren Abluftstutzen (21) aufweist.12. The apparatus of claim 10 or 11, characterized in that the channel (15) on the pressure side has a closable by a throttle exhaust port (21).
EP85101940A 1984-02-24 1985-02-22 Apparatus for drying coated articles by infra-red radiation Expired EP0154265B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85101940T ATE34457T1 (en) 1984-02-24 1985-02-22 DEVICE FOR DRYING COATED WORKPIECES BY INFRARED RADIATION.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3406789A DE3406789C1 (en) 1984-02-24 1984-02-24 Process for drying particularly powder-coated workpieces by infrared radiation
DE3406789 1984-02-24

Publications (2)

Publication Number Publication Date
EP0154265A1 true EP0154265A1 (en) 1985-09-11
EP0154265B1 EP0154265B1 (en) 1988-05-18

Family

ID=6228759

Family Applications (2)

Application Number Title Priority Date Filing Date
EP85901406A Pending EP0174351A1 (en) 1984-02-24 1985-02-22 Method and plant for drying by infrared radiation coated work-pieces
EP85101940A Expired EP0154265B1 (en) 1984-02-24 1985-02-22 Apparatus for drying coated articles by infra-red radiation

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP85901406A Pending EP0174351A1 (en) 1984-02-24 1985-02-22 Method and plant for drying by infrared radiation coated work-pieces

Country Status (12)

Country Link
US (1) US4665626A (en)
EP (2) EP0174351A1 (en)
JP (1) JPS61501082A (en)
AT (1) ATE34457T1 (en)
CA (1) CA1230273A (en)
DE (2) DE3406789C1 (en)
DK (1) DK161608C (en)
ES (1) ES8607524A1 (en)
IN (1) IN162813B (en)
NO (1) NO161193C (en)
WO (1) WO1985003766A1 (en)
ZA (1) ZA851351B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0348882A2 (en) * 1988-06-29 1990-01-03 Herberts Gesellschaft mit beschränkter Haftung Method and apparatus for making samples for controlling the quality of water soluble paints
EP0709634A2 (en) * 1994-10-26 1996-05-01 Shin Kiyokawa Apparatus for drying objects
EP0825403A3 (en) * 1996-07-17 1998-03-11 BASF Coatings Aktiengesellschaft Laboratory dryer

Families Citing this family (24)

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Publication number Priority date Publication date Assignee Title
DE3515600C1 (en) * 1985-04-30 1986-10-09 Bayerische Motoren Werke AG, 8000 München Blow tunnel for drying painted workpieces
SE453222B (en) * 1985-08-15 1988-01-18 Tri Innovations Ab VERMEBEHANDLINGSUGN
US4764102A (en) * 1986-04-22 1988-08-16 Ig-Technical Research Inc. Continuous elongate ceramic article manufacturing system
DE3806257A1 (en) * 1988-02-27 1989-08-31 Audi Ag Method of painting motor-vehicle bodies or components thereof
DE3809654C1 (en) * 1988-03-22 1989-11-09 Adolf 7251 Weissach De Berkmann Device for drying coated, in particular powder-coated workpieces by IR radiation
US4967487A (en) * 1988-04-25 1990-11-06 Urquhart Gordon T Oven for the curing and cooling of painted objects and method
US4972606A (en) * 1989-09-25 1990-11-27 George Koch Sons, Inc. Control damper for radiant oven
IT1243350B (en) * 1990-07-18 1994-06-10 Hoechst Italia PROCEDURE FOR THE COATING OF HEAT-SENSITIVE MATERIALS WITH POWDER PAINT
AU2570492A (en) * 1991-08-29 1993-04-05 Abb Flakt, Inc. Paint baking oven with infrared lamps
GB2259756B (en) * 1991-09-11 1996-01-10 Daiwa Can Co Ltd Method and apparatus for drying containers
DE4336857A1 (en) * 1993-10-28 1995-05-04 Bayerische Motoren Werke Ag Process for drying automotive paints
DE4336856A1 (en) * 1993-10-28 1995-05-04 Bayerische Motoren Werke Ag Process for drying automotive paints
JP2942235B2 (en) * 1997-03-28 1999-08-30 日本碍子株式会社 Drying method of ceramic molded body
US5937540A (en) * 1998-01-12 1999-08-17 Asia Metal Industries, Inc. Electrothermal drying device
JP3249478B2 (en) * 1998-09-17 2002-01-21 本田技研工業株式会社 Paint drying method and paint drying furnace
AU2003900491A0 (en) * 2003-02-04 2003-02-20 Bhp Steel Limited Method of curing a substrate
KR100666052B1 (en) * 2004-02-12 2007-01-09 조극래 Drying Apparatus Using Far Infrared Rays
ES2326608B1 (en) * 2007-01-19 2010-07-08 Bulma Tecnologia, S.L. PROCEDURE OF PROTECTION AGAINST OXIDATION OF PRODUCTS OF SLATE AND NATURAL STONE IN CONSTRUCTION.
WO2009055513A1 (en) * 2007-10-23 2009-04-30 Osmotica Inc. Method of drying a polymeric material
EP2463100B1 (en) * 2010-12-03 2013-07-17 Heidelberger Druckmaschinen AG Machine for processing brackets, in particular bracket pressure machine
FR3016432B1 (en) * 2014-01-16 2019-05-24 Sunkiss Matherm Radiation AIR RECYCLING VENTILATION ASSEMBLY FOR INFRARED RADIATION EMITTER WITH TEMPERATURE CONTROL
DE102018125310A1 (en) * 2018-10-12 2020-04-16 Heraeus Noblelight Gmbh Heating device with infrared emitters
MX2021012817A (en) * 2019-04-19 2022-03-04 Photex Inc System and method for inside of can curing.
CN110849125A (en) * 2019-11-15 2020-02-28 苏州卡泰里环保能源有限公司 Metal powder drying equipment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2731075A1 (en) * 1977-07-09 1979-01-25 Eugen Knobel Continuous operation oven for strip material processing - has infrared plastics sintering heater used also for heating drying air
GB1582437A (en) * 1977-09-26 1981-01-07 Casburt Ltd Apparatus for drying ceramic articles
DE3016437A1 (en) * 1980-04-29 1981-11-05 Eisenmann KG Maschinenbau-Gesellschaft mbH & Co, 7030 Böblingen Drying cabinet for enamelled or lacquered articles - has movable IR radiant heating panels with reflectors each side of flow path

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US2388917A (en) * 1941-10-13 1945-11-13 Hormel & Co Geo A Process for preservation of biological materials and products resulting therefrom
US2419643A (en) * 1944-10-02 1947-04-29 James W Swenson Oven structure
CH248264A (en) * 1944-11-14 1947-04-30 Gyr Hans Method and device for drying welding electrodes.
DE1923362A1 (en) * 1969-05-07 1970-11-19 Karl Metzger Method and device for drying objects
US4197657A (en) * 1978-02-21 1980-04-15 Leino Ilkka M Procedure for drying an organic, most appropriately axylogenic material, such as veneers for instance
US4546553B1 (en) * 1978-06-16 1993-04-13 Radiant wall oven and process of drying coated objects
GB2091858B (en) * 1980-12-11 1984-09-26 Infraroedteknik Ab Surface treatment of objects
US4535548A (en) * 1982-10-25 1985-08-20 Discovision Associates Method and means for drying coatings on heat sensitive materials

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2731075A1 (en) * 1977-07-09 1979-01-25 Eugen Knobel Continuous operation oven for strip material processing - has infrared plastics sintering heater used also for heating drying air
GB1582437A (en) * 1977-09-26 1981-01-07 Casburt Ltd Apparatus for drying ceramic articles
DE3016437A1 (en) * 1980-04-29 1981-11-05 Eisenmann KG Maschinenbau-Gesellschaft mbH & Co, 7030 Böblingen Drying cabinet for enamelled or lacquered articles - has movable IR radiant heating panels with reflectors each side of flow path

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0348882A2 (en) * 1988-06-29 1990-01-03 Herberts Gesellschaft mit beschränkter Haftung Method and apparatus for making samples for controlling the quality of water soluble paints
EP0348882A3 (en) * 1988-06-29 1990-11-28 Herberts Gesellschaft Mit Beschrankter Haftung Method and apparatus for making samples for controlling the quality of water soluble paints
EP0709634A2 (en) * 1994-10-26 1996-05-01 Shin Kiyokawa Apparatus for drying objects
EP0709634A3 (en) * 1994-10-26 1997-03-12 Shin Kiyokawa Apparatus for drying objects
US5680712A (en) * 1994-10-26 1997-10-28 Shin Kiyokawa System for drying objects to be dried
EP0825403A3 (en) * 1996-07-17 1998-03-11 BASF Coatings Aktiengesellschaft Laboratory dryer

Also Published As

Publication number Publication date
JPS6338219B2 (en) 1988-07-28
JPS61501082A (en) 1986-05-29
NO161193C (en) 1989-07-12
DK486285A (en) 1985-10-23
EP0154265B1 (en) 1988-05-18
ZA851351B (en) 1985-10-30
ATE34457T1 (en) 1988-06-15
ES540666A0 (en) 1986-06-01
EP0174351A1 (en) 1986-03-19
NO854240L (en) 1985-10-23
NO161193B (en) 1989-04-03
CA1230273A (en) 1987-12-15
US4665626A (en) 1987-05-19
DK161608B (en) 1991-07-22
DE3562824D1 (en) 1988-06-23
DK161608C (en) 1992-01-13
DE3406789C1 (en) 1989-07-20
IN162813B (en) 1988-07-09
DK486285D0 (en) 1985-10-23
WO1985003766A1 (en) 1985-08-29
ES8607524A1 (en) 1986-06-01

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