EP2666546A1 - Device for hardening varnish - Google Patents

Device for hardening varnish Download PDF

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Publication number
EP2666546A1
EP2666546A1 EP12004094.4A EP12004094A EP2666546A1 EP 2666546 A1 EP2666546 A1 EP 2666546A1 EP 12004094 A EP12004094 A EP 12004094A EP 2666546 A1 EP2666546 A1 EP 2666546A1
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EP
European Patent Office
Prior art keywords
chamber
workpiece
radiation
nozzles
inert gas
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.)
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Application number
EP12004094.4A
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German (de)
French (fr)
Inventor
Reinhard Dr. Schmidt
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Veka AG
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Veka AG
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Priority to EP12004094.4A priority Critical patent/EP2666546A1/en
Publication of EP2666546A1 publication Critical patent/EP2666546A1/en
Withdrawn legal-status Critical Current

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    • 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
    • B05D3/0466—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 a non-reacting gas
    • 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 invention relates to a device for curing paint on a workpiece with a chamber, an input through which the workpiece is conveyed into the chamber, an output through which the workpiece is conveyed from the chamber, and at least one source of electromagnetic radiation , which is directed in the chamber on the workpiece.
  • a particular requirement of coatings is their weathering resistance, in particular in the sense of a non-yellowing and other aging phenomena.
  • the proportion of photoinitiators admixed with the paint is increased to, for example, 8 to 12% in order to achieve a desired cure.
  • a high proportion of photoinitiators in the paint has the disadvantage that after UV curing unactivated photoinitiators remain in the paint, which then in the long term, in particular by solar radiation yellowing or other unwanted aging processes in the paint result.
  • the invention has for its object to provide a device for curing paint on a workpiece, which allows a good curing of the paint while avoiding aging and yellowing.
  • the invention provides a device of the type mentioned, in which at least one nozzle is arranged at the entrance of the chamber, through which an inert gas, in particular nitrogen, flows into the chamber.
  • nitrogen is injected at the entrance of the chamber via a nozzle, arises at the entrance quasi a nitrogen curtain, which extends substantially continuously around the entrance.
  • This injection of nitrogen inside the inlet of the chamber creates inside the chamber (Low) pressure of nitrogen or inert gas to the pressure of the atmosphere outside the chamber, so that around the workpiece and out of the inlet of the chamber nitrogen flows out from the inside of the chamber to the outside and so inside the chamber is a substantially pure Nitrogen atmosphere is maintained, even if a workpiece is conveyed through the chamber.
  • oxygen is kept out of the chamber as far as possible. It has been found that oxygen reduces the curing effect of ultraviolet radiation.
  • the abovementioned nozzles at the entrance to the chamber can also be referred to as peeling nozzles because they free the surface of other gases than nitrogen around the workpiece pushed into the chamber, so that they virtually “peel off” the other gases (eg oxygen).
  • nozzles are provided in the interior of the chamber, which are arranged downstream of the (peeling) nozzles arranged in the conveying direction, and preferably directly in front of the area in which the workpiece for curing the lacquer UV radiation is applied. Since these nozzles fill up almost the entire interior of the chamber with inert gas (in particular nitrogen), they can also be referred to as "volume nozzles".
  • inert gas in particular nitrogen
  • UV-Hg emitters (mercury) and UV-Hg-Ga emitters (mercury gallium) are used.
  • the radiation generated by these sources is in the wavelength range from 270 to 420 nm.
  • two mercury radiators are preferably arranged opposite one another and two mercury gallium radiators are arranged opposite one another, each offset by 90 °.
  • a further preferred embodiment provides that an oxygen detector is provided in the chamber.
  • the chamber is gas-tight except for the inlet and the outlet.
  • the inlet and outlet of the chamber are contoured so that the workpiece fits as accurately as possible through the inlet and outlet, i.e., through the inlet and outlet. H. between the workpiece and the inner contour of the input and the output as small gaps remain, which are only so large that an unobstructed promotion of the workpiece in the chamber and out of the chamber is made possible.
  • a further preferred embodiment provides that the chamber, in particular in the area of the sources for irradiating UV radiation, is mirrored in such a way that the UV radiation reaches the surface of the workpiece with maximum efficiency.
  • the mirror coating can be arranged in the region between the UV sources.
  • the mirror coating can be configured diffusely reflecting.
  • a workpiece 12 from left to right conveyed is conveyed.
  • the workpiece 12 is conveyed in the direction of the arrow 12a through the inlet 14 into the chamber and through the outlet 16 from the chamber 10.
  • a plurality of nozzles 18, 20 are arranged, through which an inert gas, in particular nitrogen, is injected into the chamber 10, in each case with a directed (directed) flow according to the arrows 18a, 20a.
  • the nozzles 18, 20 thus generate a directed inert gas flow from the interior of the chamber 10 in the direction of the inlet 14.
  • the nozzles 18, 20 generate a substantially continuous "gas curtain" around the inlet 14 such that a Peel effect around the workpiece 12 around when entering the chamber is formed and so the area around the surface of the workpiece 12 around is particularly free of oxygen and substantially only the inert gas in this area is present.
  • This acute angle ⁇ is preferably in the range of 40 to 85 °, more preferably in the range of 60 to 75 °.
  • the flow directions of the inert gases injected into the chamber from the nozzles 18, 20 thus pass obliquely through the inlet 14 in such a way that a slight inert gas overpressure exists in the chamber and inert gas exits the chamber 10 to the outside in such a way that no oxygen enters the chamber ,
  • a plurality of nozzles 18, 20 are arranged around the entrance 14, z. B. four nozzles, each offset by 90 ° about the conveying direction 12a are arranged around.
  • sources 26, 28 are arranged for UV radiation.
  • This arrangement of the sources of UV radiation is in particular according to section Fig. 2 (Line AB of the Fig. 1 ).
  • Fig. 2 are in the illustrated embodiment, four such UV radiation sources 26, 28, 34, 36 in a plane perpendicular to the plane of Fig. 1 arranged around the passed workpiece 12.
  • the radiation sources 26, 28 are UV-Hg emitters and the radiation sources 34, 36 are UV-Hg-Ga emitters.
  • the radiated from said radiation sources 30, 32, 38, 40 are according to the arrows in accordance with Figures 1 and 2 aligned and thus form quasi a continuous "radiation curtain" around the workpiece 12. It thus takes place a loading of the workpiece 12 with curing radiation whose radiation density is homogeneous around the workpiece.
  • reflectors 42, 44, 46, 48 are arranged around the workpiece in order to promote the concentration of the radiations on the workpiece.
  • the reflectors are preferably designed to be diffusely reflective in order to promote the homogeneity of the radiation exposure of the workpiece.
  • the mirrors (reflectors) 42, 44, 46, 48 are arranged between the radiation sources 26, 28, 34, 36 such that a substantially closed radiation space is formed in the region of the radiation sources in the chamber 10.
  • nozzles 22, 24 are arranged, via which inert gas, in particular nitrogen, flows into the chamber 10.
  • These nozzles 22, 24 serve to generate a gas atmosphere in the chamber 10, which essentially contains the inert gas (nitrogen) and is as oxygen-free as possible.
  • the nozzles 22, 24 do not necessarily need the highly concentrated and aligned injection direction of the arranged at the entrance Nozzles 18, 20 show. They create the inert gas atmosphere inside the chamber.
  • the metering of the amounts of inert gas injected into the chamber via the above-described nozzles 18, 20, 22, 24 takes place separately for each nozzle via electrical control valves.
  • the flows from the nozzles are adjusted so that a predeterminable limit of residual oxygen in the chamber 10 is not exceeded.
  • an oxygen detector is provided in the chamber, in particular near the workpiece conveying path in the region of the UV radiator.
  • the injected amounts of nitrogen are adjusted so that the desired oxygen limit is not exceeded, but on the other hand, the inert gas consumption is not greater than is necessary.
  • an oxygen detector can z. B. serve a ZrO 2 detector.
  • the residual oxygen content may, for. B. in the range of 0 to 5000 ppm.
  • the oxygen readings are evaluated directly in a computer and the supply of inert gas (nitrogen) into the chamber 10 is controlled accordingly so that a desired residual oxygen limit is not exceeded.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The apparatus has an input port (14) through which a workpiece (12) is conveyed into a chamber (10). An output port (16) is used for conveying the workpiece out from the chamber. The sources (26,28) are used for radiating the UV radiation on the workpiece into the chamber. The nozzles (18,20) are provided at the input port of the chamber for the passage of the inert gas into the chamber.

Description

Die Erfindung betrifft eine Vorrichtung zum Härten von Lack auf einem Werkstück mit einer Kammer, einem Eingang, durch den das Werkstück in die Kammer förderbar ist, einem Ausgang, durch den das Werkstück aus der Kammer förderbar ist, und mit zumindest einer Quelle für elektromagnetische Strahlung, die in der Kammer auf das Werkstück gerichtet ist.The invention relates to a device for curing paint on a workpiece with a chamber, an input through which the workpiece is conveyed into the chamber, an output through which the workpiece is conveyed from the chamber, and at least one source of electromagnetic radiation , which is directed in the chamber on the workpiece.

Die Härtung von Lacken mittels UV-Strahlung ist im Stand der Technik gut bekannt. Für die Härtung werden dem Lack sogenannte Initiatoren beigefügt, die von UV-Strahlung aktiviert werden und die Härtung durch Quervernetzung bewirken.The curing of paints by UV radiation is well known in the art. For the curing so-called initiators are added to the paint, which are activated by UV radiation and cause curing by cross-linking.

Eine besondere Anforderung an Lacke ist deren Witterungsbeständigkeit, insbesondere im Sinne einer Nichtvergilbung und auch anderer Alterungserscheinungen. Im Stand der Technik erhöht man den Anteil der dem Lack zugemischten Fotoinitiatoren auf zum Beispiel 8 bis 12 %, um eine gewünschte Härtung zu erreichen. Allerdings bringt ein hoher Anteil an Fotoinitiatoren im Lack den Nachteil, dass nach der UV-Härtung nicht aktivierte Fotoinitiatoren im Lack verbleiben, die dann insbesondere durch Sonnenstrahlung langfristig eine Vergilbung oder andere unerwünschte Alterungsprozesse im Lack zur Folge haben.A particular requirement of coatings is their weathering resistance, in particular in the sense of a non-yellowing and other aging phenomena. In the prior art, the proportion of photoinitiators admixed with the paint is increased to, for example, 8 to 12% in order to achieve a desired cure. However, a high proportion of photoinitiators in the paint has the disadvantage that after UV curing unactivated photoinitiators remain in the paint, which then in the long term, in particular by solar radiation yellowing or other unwanted aging processes in the paint result.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zum Härten von Lack auf einem Werkstück bereitzustellen, die eine gute Härtung des Lackes unter Vermeidung von Alterungs- und Vergilbungserscheinungen ermöglicht.The invention has for its object to provide a device for curing paint on a workpiece, which allows a good curing of the paint while avoiding aging and yellowing.

Hierzu stellt die Erfindung eine Vorrichtung der eingangs genannten Art bereit, bei der zumindest eine Düse am Eingang der Kammer angeordnet ist, durch die ein Inertgas, insbesondere Stickstoff, in die Kammer strömt.For this purpose, the invention provides a device of the type mentioned, in which at least one nozzle is arranged at the entrance of the chamber, through which an inert gas, in particular nitrogen, flows into the chamber.

Als Werkstück kommen hier insbesondere in Betracht Profile für Fenster und dergleichen.As a workpiece here come into consideration in particular profiles for windows and the like.

Dadurch, dass erfindungsgemäß am Eingang der Kammer über eine Düse Stickstoff eingeblasen wird, entsteht am Eingang quasi ein Stickstoff-Vorhang, der sich im Wesentlichen kontinuierlich um den Eingang herum erstreckt. Dieses Einblasen von Stickstoff innenseitig am Eingang der Kammer erzeugt im Inneren der Kammer einen (geringen) Überdruck an Stickstoff bzw. Inertgas gegenüber dem Druck der Atmosphäre außerhalb der Kammer, so dass um das Werkstück herum und aus dem Eingang der Kammer heraus Stickstoff aus dem Inneren der Kammer nach außen strömt und so im Inneren der Kammer eine im Wesentlichen reine Stickstoffatmosphäre aufrechterhalten bleibt, auch wenn ein Werkstück durch die Kammer gefördert wird.The fact that according to the invention nitrogen is injected at the entrance of the chamber via a nozzle, arises at the entrance quasi a nitrogen curtain, which extends substantially continuously around the entrance. This injection of nitrogen inside the inlet of the chamber creates inside the chamber (Low) pressure of nitrogen or inert gas to the pressure of the atmosphere outside the chamber, so that around the workpiece and out of the inlet of the chamber nitrogen flows out from the inside of the chamber to the outside and so inside the chamber is a substantially pure Nitrogen atmosphere is maintained, even if a workpiece is conveyed through the chamber.

Hierdurch wird Sauerstoff weitestgehend aus der Kammer herausgehalten. Es hat sich gezeigt, dass Sauerstoff die härtende Wirkung der Ultraviolettstrahlung vermindert.As a result, oxygen is kept out of the chamber as far as possible. It has been found that oxygen reduces the curing effect of ultraviolet radiation.

Die vorstehend genannten Düsen am Eingang zur Kammer können auch als Schäldüsen bezeichnet werden, weil sie um das in die Kammer geschobene Werkstück herum dessen Oberfläche von anderen Gasen als Stickstoff befreien, die anderen Gase (z. B. Sauerstoff) also quasi "abschälen".The abovementioned nozzles at the entrance to the chamber can also be referred to as peeling nozzles because they free the surface of other gases than nitrogen around the workpiece pushed into the chamber, so that they virtually "peel off" the other gases (eg oxygen).

Mit der Erfindung ist es möglich, den Anteil von Fotoinitiatoren im Lack unter 3 % zu halten und trotzdem eine gute chemische Vernetzungsreaktion zum Erzielen einer starken Härtung zu erreichen.With the invention, it is possible to keep the proportion of photoinitiators in the paint below 3% and still achieve a good chemical crosslinking reaction to achieve a strong cure.

Gemäß einer bevorzugten Ausgestaltung der Erfindung sind neben den genannten (Schäl-)Düsen weitere Düsen im Inneren der Kammer vorgesehen, die den am Eingang angeordneten (Schäl-)Düsen in Förderrichtung nachgeordnet sind, und zwar bevorzugt unmittelbar vor dem Bereich, in dem das Werkstück zur Lackhärtung mit der UV-Strahlung beaufschlagt wird. Da diese Düsen quasi den gesamten Innenraum der Kammer mit Inertgas (insbesondere Stickstoff) füllen, können sie auch als "Volumendüsen" bezeichnet werden.According to a preferred embodiment of the invention, in addition to said (peeling) nozzles further nozzles are provided in the interior of the chamber, which are arranged downstream of the (peeling) nozzles arranged in the conveying direction, and preferably directly in front of the area in which the workpiece for curing the lacquer UV radiation is applied. Since these nozzles fill up almost the entire interior of the chamber with inert gas (in particular nitrogen), they can also be referred to as "volume nozzles".

Als Quellen für die UV-Strahlung werden gemäß einer bevorzugten Ausgestaltung als solche bekannte UV-Hg-Strahler (Quecksilber) und UV-Hg-Ga-Strahler (Quecksilber-Gallium) eingesetzt. Die durch diese Quellen erzeugte Strahlung liegt im Wellenlängenbereich von 270 bis 420 nm.As sources for the UV radiation according to a preferred embodiment as such known UV-Hg emitters (mercury) and UV-Hg-Ga emitters (mercury gallium) are used. The radiation generated by these sources is in the wavelength range from 270 to 420 nm.

Dabei sind bevorzugt jeweils zwei Quecksilber-Strahler aneinander gegenüberliegend angeordnet und zwei Quecksilber-Gallium-Strahler aneinander gegenüberliegend angeordnet, jeweils versetzt um 90°.In this case, two mercury radiators are preferably arranged opposite one another and two mercury gallium radiators are arranged opposite one another, each offset by 90 °.

Eine weitere bevorzugte Ausgestaltung sieht vor, dass in der Kammer ein SauerstoffDetektor vorgesehen ist.A further preferred embodiment provides that an oxygen detector is provided in the chamber.

Die Kammer ist bis auf den Eingang und den Ausgang gasdicht abgeschlossen. Zur Verminderung von Sauerstoffeintritt in die Kammer ist gemäß einer bevorzugten Ausgestaltung vorgesehen, dass der Eingang und der Ausgang der Kammer so konturiert sind, dass das Werkstück so passgenau wie möglich durch den Eingang und den Ausgang passt, d. h. zwischen dem Werkstück und der inneren Kontur des Eingangs und des Ausgangs sollen möglichst kleine Spalte verbleiben, die nur so groß sind, dass eine ungehinderte Förderung des Werkstückes in die Kammer und aus der Kammer heraus ermöglicht ist.The chamber is gas-tight except for the inlet and the outlet. To reduce oxygen entry into the chamber, according to a preferred embodiment, the inlet and outlet of the chamber are contoured so that the workpiece fits as accurately as possible through the inlet and outlet, i.e., through the inlet and outlet. H. between the workpiece and the inner contour of the input and the output as small gaps remain, which are only so large that an unobstructed promotion of the workpiece in the chamber and out of the chamber is made possible.

Eine weitere bevorzugte Ausgestaltung sieht vor, dass die Kammer insbesondere im Bereich der Quellen zum Einstrahlen von UV-Strahlung derart verspiegelt ist, dass die UV-Strahlung mit maximalem Wirkungsgrad auf die Oberfläche des Werkstückes gelangt. Hierzu kann insbesondere die Verspiegelung in dem Bereich zwischen den UV-Quellen angeordnet werden. Insbesondere kann die Verspiegelung diffus reflektierend ausgestaltet sein.A further preferred embodiment provides that the chamber, in particular in the area of the sources for irradiating UV radiation, is mirrored in such a way that the UV radiation reaches the surface of the workpiece with maximum efficiency. For this purpose, in particular the mirror coating can be arranged in the region between the UV sources. In particular, the mirror coating can be configured diffusely reflecting.

Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung näher beschrieben. Es zeigt:

  • Fig. 1 einen Schnitt durch eine Vorrichtung zum Härten von Lack und
  • Fig. 2 einen Schnitt durch die Vorrichtung gemäß Fig. 1 entlang der Linie A-B.
An embodiment of the invention will be described in more detail with reference to the drawing. It shows:
  • Fig. 1 a section through a device for curing paint and
  • Fig. 2 a section through the device according to Fig. 1 along the line AB.

Durch eine Kammer 10 ist gemäß Fig. 1 ein Werkstück 12 von links nach rechts förderbar. Das Werkstück 12 wird in Richtung des Pfeiles 12a durch den Eingang 14 in die Kammer und durch den Ausgang 16 aus der Kammer 10 gefördert.Through a chamber 10 is according to Fig. 1 a workpiece 12 from left to right conveyed. The workpiece 12 is conveyed in the direction of the arrow 12a through the inlet 14 into the chamber and through the outlet 16 from the chamber 10.

Am Eingang 14 sind mehrere Düsen 18, 20 angeordnet, durch die ein Inertgas, insbesondere Stickstoff, in die Kammer 10 injiziert wird, und zwar jeweils mit einer gezielten (gerichteten) Strömung gemäß den Pfeilen 18a, 20a. Die Düsen 18, 20 erzeugen also eine gerichtete Inertgas-Strömung aus dem Inneren der Kammer 10 in Richtung auf den Einlass 14. Bevorzugt erzeugen die Düsen 18, 20 einen im Wesentlichen kontinuierlichen "Gas-Vorhang" um den Eingang 14 herum derart, dass ein Schäleffekt um das Werkstück 12 herum beim Eintritt in die Kammer entsteht und so der Bereich um die Oberfläche des Werkstückes 12 herum von insbesondere Sauerstoff befreit wird und im Wesentlichen nur das Inertgas in diesem Bereich anwesend ist. Die Strömungsrichtung des aus den Düsen 18, 20 austretenden Gases gemäß den Pfeilen 18a, 20a, bildet somit mit der Förderrichtung 12a des Werkstückes 12 einen spitzen Winkel α. Dieser spitze Winkel α liegt bevorzugt im Bereich von 40 bis 85°, weiter bevorzugt im Bereich von 60 bis 75°. Die Strömungsrichtungen der aus den Düsen 18, 20 in die Kammer injizierten Inertgase durchsetzt also schräg den Eingang 14 derart, dass ein leichter Inertgasüberdruck in der Kammer besteht und Inertgas in einem Maß aus der Kammer 10 nach außen austritt, dass kein Sauerstoff in die Kammer eintritt. Bevorzugt sind mehrere Düsen 18, 20 rund um den Eingang 14 angeordnet, z. B. vier Düsen, die jeweils um 90° versetzt um die Förderrichtung 12a herum angeordnet sind.At the inlet 14 a plurality of nozzles 18, 20 are arranged, through which an inert gas, in particular nitrogen, is injected into the chamber 10, in each case with a directed (directed) flow according to the arrows 18a, 20a. The nozzles 18, 20 thus generate a directed inert gas flow from the interior of the chamber 10 in the direction of the inlet 14. Preferably, the nozzles 18, 20 generate a substantially continuous "gas curtain" around the inlet 14 such that a Peel effect around the workpiece 12 around when entering the chamber is formed and so the area around the surface of the workpiece 12 around is particularly free of oxygen and substantially only the inert gas in this area is present. The flow direction of the gas emerging from the nozzles 18, 20 according to the arrows 18 a, 20 a, thus forms with the conveying direction 12 a of the workpiece 12 an acute angle α. This acute angle α is preferably in the range of 40 to 85 °, more preferably in the range of 60 to 75 °. The flow directions of the inert gases injected into the chamber from the nozzles 18, 20 thus pass obliquely through the inlet 14 in such a way that a slight inert gas overpressure exists in the chamber and inert gas exits the chamber 10 to the outside in such a way that no oxygen enters the chamber , Preferably, a plurality of nozzles 18, 20 are arranged around the entrance 14, z. B. four nozzles, each offset by 90 ° about the conveying direction 12a are arranged around.

Entlang der Förderstrecke, auf welcher das Werkstück 12 durch die Kammer 10 gefördert wird, sind Quellen 26, 28 für UV-Strahlung angeordnet. Diese Anordnung der Quellen für UV-Strahlung ist insbesondere im Schnitt gemäß Fig. 2 (Linie A-B der Fig. 1) dargestellt. Gemäß Fig. 2 sind beim dargestellten Ausführungsbeispiel vier solche UV-Strahlungsquellen 26, 28, 34, 36 in einer Ebene senkrecht zur Zeichnungsebene von Fig. 1 rund um das durchlaufene Werkstück 12 angeordnet. Die Strahlungsquellen 26, 28 sind UV-Hg-Strahler und die Strahlungsquellen 34, 36 sind UV-Hg-Ga-Strahler. Die von den genannten Strahlungsquellen abgegebenen Strahlungen 30, 32, 38, 40 sind entsprechend den Pfeilen gemäß den Figuren 1 und 2 ausgerichtet und bilden somit quasi einen kontinuierlichen "Strahlungsvorhang" rund um das Werkstück 12. Es erfolgt somit eine Beaufschlagung des Werkstückes 12 mit härtender Strahlung, deren Strahlungsdichte rund um das Werkstück homogen ist.Along the conveyor line, on which the workpiece 12 is conveyed through the chamber 10, sources 26, 28 are arranged for UV radiation. This arrangement of the sources of UV radiation is in particular according to section Fig. 2 (Line AB of the Fig. 1 ). According to Fig. 2 are in the illustrated embodiment, four such UV radiation sources 26, 28, 34, 36 in a plane perpendicular to the plane of Fig. 1 arranged around the passed workpiece 12. The radiation sources 26, 28 are UV-Hg emitters and the radiation sources 34, 36 are UV-Hg-Ga emitters. The radiated from said radiation sources 30, 32, 38, 40 are according to the arrows in accordance with Figures 1 and 2 aligned and thus form quasi a continuous "radiation curtain" around the workpiece 12. It thus takes place a loading of the workpiece 12 with curing radiation whose radiation density is homogeneous around the workpiece.

In dem Bereich der Kammer, in dem die Strahlungen 30, 32, 38, 40 zur Wirkung kommen, sind Reflektoren 42, 44, 46, 48 rund um das Werkstück angeordnet, um die Konzentration der Strahlungen auf das Werkstück zu fördern. Die Reflektoren sind bevorzugt diffus reflektierend ausgestaltet, um die Homogenität der Strahlungsbeaufschlagung des Werkstückes zu fördern. Die Spiegel (Reflektoren) 42, 44, 46, 48 sind derart zwischen den Strahlungsquellen 26, 28, 34, 36 angeordnet, dass ein im Wesentlichen geschlossener Strahlungsraum im Bereich der Strahlungsquellen in der Kammer 10 gebildet wird.In the region of the chamber in which the radiations 30, 32, 38, 40 come into effect, reflectors 42, 44, 46, 48 are arranged around the workpiece in order to promote the concentration of the radiations on the workpiece. The reflectors are preferably designed to be diffusely reflective in order to promote the homogeneity of the radiation exposure of the workpiece. The mirrors (reflectors) 42, 44, 46, 48 are arranged between the radiation sources 26, 28, 34, 36 such that a substantially closed radiation space is formed in the region of the radiation sources in the chamber 10.

Auf der Förderstrecke vom Eingang 14 zu den Strahlungsquellen 26, 28, 34, 36 sind Düsen 22, 24 angeordnet, über die Inertgas, insbesondere Stickstoff, in die Kammer 10 strömt. Diese Düsen 22, 24 dienen dazu, in der Kammer 10 eine Gasatmosphäre zu erzeugen, die im Wesentlichen das Inertgas (Stickstoff) enthält und möglichst sauerstofffrei ist. Hierzu brauchen die Düsen 22, 24 nicht notwendigerweise die stark konzentrierte und ausgerichtete Injektionsrichtung der am Eingang angeordneten Düsen 18, 20 aufzuweisen. Sie erzeugen die Inertgas-Atmosphäre im Inneren der Kammer.On the conveyor line from the inlet 14 to the radiation sources 26, 28, 34, 36 nozzles 22, 24 are arranged, via which inert gas, in particular nitrogen, flows into the chamber 10. These nozzles 22, 24 serve to generate a gas atmosphere in the chamber 10, which essentially contains the inert gas (nitrogen) and is as oxygen-free as possible. For this purpose, the nozzles 22, 24 do not necessarily need the highly concentrated and aligned injection direction of the arranged at the entrance Nozzles 18, 20 show. They create the inert gas atmosphere inside the chamber.

Die Dosierung der über die oben beschriebenen Düsen 18, 20, 22, 24 in die Kammer injizierten Inertgasmengen erfolgt für jede Düse getrennt über elektrische Stellventile. Die Strömungen aus den Düsen werden so eingestellt, dass ein vorgebbarer Grenzwert an Restsauerstoff in der Kammer 10 nicht überschritten wird. Hierzu ist ein Sauerstoffdetektor in der Kammer vorgesehen, insbesondere nahe der Werkstück-Förderstrecke im Bereich der UV-Strahler. Die injizierten Stickstoffmengen werden so eingestellt, dass der gewünschte Sauerstoff-Grenzwert nicht überschritten wird, andererseits aber auch der Inertgas-Verbrauch nicht größer wird als hierzu notwendig ist.The metering of the amounts of inert gas injected into the chamber via the above-described nozzles 18, 20, 22, 24 takes place separately for each nozzle via electrical control valves. The flows from the nozzles are adjusted so that a predeterminable limit of residual oxygen in the chamber 10 is not exceeded. For this purpose, an oxygen detector is provided in the chamber, in particular near the workpiece conveying path in the region of the UV radiator. The injected amounts of nitrogen are adjusted so that the desired oxygen limit is not exceeded, but on the other hand, the inert gas consumption is not greater than is necessary.

Als Sauerstoffdetektor kann z. B. ein ZrO2-Detektor dienen. Der Rest-Sauerstoffgehalt kann z. B. im Bereich von 0 bis 5.000 ppm liegen. Die Sauerstoff-Messwerte werden direkt in einem Rechner ausgewertet und die Zufuhr von Inertgas (Stickstoff) in die Kammer 10 wird entsprechend so geregelt, dass ein gewünschter Restsauerstoff-Grenzwert nicht überschritten wird.As an oxygen detector can z. B. serve a ZrO 2 detector. The residual oxygen content may, for. B. in the range of 0 to 5000 ppm. The oxygen readings are evaluated directly in a computer and the supply of inert gas (nitrogen) into the chamber 10 is controlled accordingly so that a desired residual oxygen limit is not exceeded.

Damit die Inertgas-Verluste über den Eingang 14 und den Ausgang 16 der Kammer minimiert werden, sind am Eingang und am Ausgang der Kammer jeweils Kulissen montierbar, deren Kontur der des Werkstückes angepasst ist, sodass der Spalt zwischen dem Werkstück und der Innenkontur des Einganges bzw. des Ausganges minimiert wird.

10
Kammer
12
Werkstück
14
Eingang
16
Ausgang
18
Düse (Schäldüse)
20
Düse (Schäldüse)
22
Düse (Volumendüse)
24
Düse (Volumendüse)
26
Quelle (UV-Hg)
28
Quelle (UV-Hg)
30
Strahlung (UV-Hg)
32
Strahlung (UV-Hg)
34
Quelle (UV-Hg-Ga)
36
Quelle (UV-Hg-Ga)
38
Strahlung (UV-Hg-Ga)
40
Strahlung (UV-Hg-Ga)
42
Reflektor
44
Reflektor
46
Reflektor
48
Reflektor
Thus, the inert gas losses are minimized via the input 14 and the output 16 of the chamber, at the entrance and at the output of the chamber each scenes can be mounted, the contour of which is adapted to the workpiece, so that the gap between the workpiece and the inner contour of the input or the output is minimized.
10
chamber
12
workpiece
14
entrance
16
output
18
Nozzle (peeling nozzle)
20
Nozzle (peeling nozzle)
22
Nozzle (volume nozzle)
24
Nozzle (volume nozzle)
26
Source (UV-Hg)
28
Source (UV-Hg)
30
Radiation (UV-Hg)
32
Radiation (UV-Hg)
34
Source (UV-Hg-Ga)
36
Source (UV-Hg-Ga)
38
Radiation (UV-Hg-Ga)
40
Radiation (UV-Hg-Ga)
42
reflector
44
reflector
46
reflector
48
reflector

Claims (7)

Vorrichtung zum Härten von Lack auf einem Werkstück (12) mit - einer Kammer (10), - einem Eingang (14), durch den das Werkstück (12) in die Kammer förderbar ist, - einem Ausgang (16), durch den das Werkstück (12) aus der Kammer förderbar ist, und - zumindest einer Quelle (26, 28, 34, 36) zum Einstrahlen von Ultraviolettstrahlung in die Kammer (10) auf das Werkstück (12), - gekennzeichnet durch - zumindest eine Düse (18, 20) am Eingang (14) der Kammer (10), durch die Inertgas in die Kammer (10) strömt. Device for curing paint on a workpiece (12) with a chamber (10), - An input (14) through which the workpiece (12) is conveyed into the chamber, - An output (16) through which the workpiece (12) is conveyed from the chamber, and at least one source (26, 28, 34, 36) for irradiating ultraviolet radiation into the chamber (10) on the workpiece (12), - marked by - At least one nozzle (18, 20) at the inlet (14) of the chamber (10), flows through the inert gas in the chamber (10). Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Inertgas Stickstoff ist.Apparatus according to claim 1, characterized in that the inert gas is nitrogen. Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Düse (18, 20) so gerichtet ist, dass ihre Hauptströmungsrichtung (18a, 20a) schräg zur Förderrichtung (12a) des Werkstückes (12) und in Richtung des Eingangs (14) steht.Device according to one of claims 1 or 2, characterized in that the nozzle (18, 20) is directed so that its main flow direction (18a, 20a) obliquely to the conveying direction (12a) of the workpiece (12) and in the direction of the input (14 ) stands. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass mehrere Düsen (18, 20) rund um den Eingang (14) angeordnet sind.Device according to one of claims 1 to 3, characterized in that a plurality of nozzles (18, 20) are arranged around the entrance (14). Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zumindest eine weitere Düse (26, 28, 34, 36) in Förderrichtung (12a) des Werkstückes zwischen dem Eingang (14) und der Ultraviolettstrahlung (30, 32, 38, 40) angeordnet ist, durch die Inertgas in die Kammer (10) strömt.Device according to one of the preceding claims, characterized in that arranged at least one further nozzle (26, 28, 34, 36) in the conveying direction (12a) of the workpiece between the input (14) and the ultraviolet radiation (30, 32, 38, 40) is, flows through the inert gas in the chamber (10). Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die am Eingang angeordneten Düsen (18, 20) rund um den Eingang (14) einen kontinuierlichen Inertgas-Strom erzeugen.Device according to one of the preceding claims, characterized in that the nozzles (18, 20) arranged at the inlet generate a continuous flow of inert gas around the inlet (14). Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Eingang (14) der Kammer (10) eine Kontur aufweist, welche der Kontur des Werkstückes (12) entspricht.Device according to one of the preceding claims, characterized in that the input (14) of the chamber (10) has a contour which corresponds to the contour of the workpiece (12).
EP12004094.4A 2012-05-25 2012-05-25 Device for hardening varnish Withdrawn EP2666546A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2786807A1 (en) * 2013-04-05 2014-10-08 IOT - Innovative Oberflächentechnologie GmbH Device for innertion with UV irradiation in open throughput systems

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1967284A2 (en) * 2007-03-06 2008-09-10 Ist Metz Gmbh Method and device for UV-ray hardening of substrate layers
WO2009063134A2 (en) * 2007-11-12 2009-05-22 Tikkurila Oy Coating an object

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1967284A2 (en) * 2007-03-06 2008-09-10 Ist Metz Gmbh Method and device for UV-ray hardening of substrate layers
WO2009063134A2 (en) * 2007-11-12 2009-05-22 Tikkurila Oy Coating an object

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2786807A1 (en) * 2013-04-05 2014-10-08 IOT - Innovative Oberflächentechnologie GmbH Device for innertion with UV irradiation in open throughput systems

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