EP1779050B1 - Irradiation unit - Google Patents

Irradiation unit Download PDF

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Publication number
EP1779050B1
EP1779050B1 EP05767850A EP05767850A EP1779050B1 EP 1779050 B1 EP1779050 B1 EP 1779050B1 EP 05767850 A EP05767850 A EP 05767850A EP 05767850 A EP05767850 A EP 05767850A EP 1779050 B1 EP1779050 B1 EP 1779050B1
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Prior art keywords
profile
reflector
irradiation unit
unit according
support
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German (de)
French (fr)
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EP1779050A1 (en
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Oliver Treichel
Klaus Ebinger
Joachim Jung
Günter Fuchs
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IST Metz GmbH
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IST Metz GmbH
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/005—Reflectors for light sources with an elongated shape to cooperate with linear light sources

Definitions

  • the invention relates to an irradiation unit for the UV irradiation of in particular web-shaped substrates with a box-shaped housing, a rod-shaped UV lamp arranged therein and a reflector arrangement extending along the UV lamp.
  • the U.S. Patent 5,444,576 shows an irradiation apparatus, for example, for irradiation of printed circuit boards with a holding plate for a cooling tank to a reflector body for a mercury vapor lamp and a frame as a diaphragm on the underside of the reflector body.
  • the cooling tank is used in a multi-part reflector profile and secured only against lateral falling out.
  • the present invention seeks to improve an aggregate of the type specified in that the disadvantages encountered in the prior art are avoided and a variable use is possible.
  • the reflector arrangement has a carrier profile held in the housing and a reflector profile which is releasably connectable via positive connection surfaces and held in the area of the connection surfaces via screw connections as a connection means in mutual surface contact, formed as a dimensionally stable molded part and thus replaceable.
  • a modular structure is created in a simple manner, which makes it possible to optimally adapt the irradiation profile to the respective process conditions.
  • the use of profiled bodies predefines a defined geometry over the length of the lamp, which can also be adapted at short notice in terms of various parameters such as the chemical formulation of the coating agent to be cured, the still acceptable heat input to the substrate and the irradiation duration or dose can.
  • a plurality of reflector profiles with different reflector geometries and / or surface coatings as a modular system can be selectively connected to the carrier profile, wherein a uniform assembly is ensured by uniform connection surfaces regardless of the reflector geometry.
  • a further improvement provides that the reflector profile and the carrier profile can be brought together via the connecting surfaces in flat leitrome.
  • a simplification of the installation results from the fact that the connecting means can be actuated by the back of the carrier profile facing away from the reflector profile. It is also favorable if the connecting means are accessible from, for example, closable housing flaps from the outside of the housing.
  • a further advantageous embodiment provides that the connecting means seen in the profile direction preferably allow a thermal compensation clearance between reflector profile and carrier profile via a slot bearing.
  • the connecting means are formed by shaft side preferably to stop in the reflector profile and head side preferably supported by spring and / or sliding discs on the support profile bolted.
  • the carrier profile can be acted upon by a cooling, in particular a water cooling with coolant.
  • a cooling in particular a water cooling with coolant.
  • the carrier profile is provided with profile channels for the passage of coolant. This also makes it possible to replace the reflector profiles without interrupting the cooling system in a short time.
  • the reflector profile facing away from its connecting surface with the carrier profile has a curved reflector surface deviating from its contour profile.
  • the bonding surface can therefore be made uniform for a standardized recording, while the reflector surface is selectively adapted to the irradiation conditions.
  • the reflector profile is provided on its side facing the UV lamp profile side with a reflection coating.
  • the reflector profile is formed as a solid body of a solid material.
  • the reflector profile and the carrier profile as extruded profile parts are preferably made of aluminum.
  • a heat conducting, in particular thermal paste is introduced.
  • a carrier profile and an associated reflector profile are arranged in pairs on both sides of a longitudinal center plane of the UV lamp.
  • two reflector profiles, together with associated carrier profiles it is possible for two reflector profiles, together with associated carrier profiles, to be arranged in the housing so as to be pivotable relative to each other about an axis extending in the profile direction.
  • the UV irradiation unit shown in the drawing consists essentially of a box-shaped housing 10, arranged therein a rod-shaped UV lamp 12, a reflector assembly 14 for reflecting the radiated into the housing 10 UV light on a bottom housing opening 16 and an absorber 18 for dissipating heat loss via a cooling device, not shown.
  • the UV lamp 12 is arranged as a double-ended medium-pressure gas discharge lamp in the central longitudinal plane 20 of the housing 10 and emits its radiation via the housing opening 16 to the substrate web guided underneath or to the object to be irradiated.
  • the UV lamp 12 is surrounded in its pointing into the housing interior sector over its length by the reflector assembly 14, wherein the reflected light depending on the reflector geometry divergent, parallel or bundled through the housing opening 16 is radiated. It is also conceivable that different reflection geometries are realized in reflector subregions.
  • the reflector assembly 14 consists of carrier profiles 22 and reflector profiles 24 releasably connected thereto.
  • the carrier and reflector profiles are arranged in pairs on both sides of the longitudinal center plane 20 of the housing 10 or UV lamp 12. wherein the profile direction is parallel to the lamp axis. They consist of massive extruded aluminum parts, so that especially the reflector profiles 24 are formed dimensionally stable as a complex contoured moldings. It is possible to use different reflector profiles 24 in the manner of a modular system. In Fig.1 this is shown for better illustration half of two reflector geometries left and right of the median plane 20, wherein in practice usually the same profile parts are arranged mirror-symmetrically, but in principle asymmetric arrangements are possible.
  • the reflector profiles 24 and carrier profiles 22 can be brought into positive contact with large-area heat-conducting contact via complementary complementary connection surfaces 26, 28.
  • the carrier profiles 22 can be connected via profile channels 30 for the passage of cooling water to the cooling device. In this way it is possible to work with high lamp powers in the range of a few 10 kW.
  • the carrier profile 22 and the reflector profile 24 are held in the region of the connecting surfaces 26, 28 via screw 32 in mutual contact.
  • screw 32 are accessible by housing flaps 34 of the housing outside.
  • the screw 32 are formed by studs 36 which are screwed from the back 38 of the support section 22 forth in the reflector profile 24.
  • the stud bolts 36 are screwed with their stepped threaded shaft 40 to stop in the reflector profile 24.
  • the screw head 42 is supported by disc springs 44 and sliding discs 46 with defined adhesion to the support section 22.
  • the step opening 48 is seen in the profile direction formed as a slot.
  • the reflector surface 50 of the reflector profiles 24 facing the UV lamp 12 can be designed independently of the profile contour of the connection surface 26. Elliptic, parabolic and circular reflector geometries as well as combinations thereof are used. Also conceivable are reflector surfaces 50 with Freilinienformen.
  • the spectral range of the reflected light can be influenced.
  • High-purity aluminum surfaces reflect the entire spectrum, while so-called cold-mirror coatings, depending on the design, only reflect selected spectral bandwidths in the UV range.
  • the heat absorbed in the reflector assembly 14 can be dissipated by the air cooling with suction through the exhaust duct 54 in addition to the water cooling.
  • the UV and IR emission of the gas discharge lamp 12 can not be switched on and off spontaneously for physical reasons. Therefore, it is intended to bring the reflector assembly 14 during startup or interruptions in operation in a standby position in which the housing opening 16 is mechanically sealed against radiation passage.
  • the carrier profiles are movable relative to one another about a pivot axis or axis of rotation running parallel to the profile direction, the IR power being absorbed by the cooled absorber 18. From this position can be changed without significant loss of time by pressing the folding or rotating mechanism in the production mode.
  • a movable reflector and the use of a separate closure system is possible.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Coating Apparatus (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Abstract

The invention relates to an irradiation unit for the UV irradiation of particularly web-shaped substrates, comprising a housing (10), a tubular UV lamp (12), arranged therein and a reflector arrangement (14), running along the UV lamp (12). According to the invention, a simple exchangeability may be achieved, whereby the reflector arrangement comprises a support profile (22), retained in the housing (10) and a reflector profile (24), embodied as a shape-retaining molded piece which may be detachably connected thereto.

Description

Die Erfindung betrifft ein Bestrahlungsaggregat zur UV-Bestrahlung von insbesondere bahnförmigen Substraten mit einem kastenförmigen Gehäuse, einer darin angeordneten stabförmigen UV-Lampe und einer längs der UV-Lampe sich erstreckenden Reflektoranordnung.The invention relates to an irradiation unit for the UV irradiation of in particular web-shaped substrates with a box-shaped housing, a rod-shaped UV lamp arranged therein and a reflector arrangement extending along the UV lamp.

Die UV-Trocknung und Vernetzung von Lacken, Farben sowie Klebstoffen unter Ausnutzung des Energieinhalts von Lichtquanten im UV-Lichtbereich mit Hilfe von lang gestreckten Mitteldruck-Gasentladungslampen findet seit über 30 Jahren breiten industriellen Einsatz in der Druck-, Verpackungs- und Oberflächenindustrie. Lösemittelfreiheit beim Prozess und die Erreichbarkeit hoher Vernetzungsdichten bei Bearbeitungszeiten im Durchlauf von Bruchteilen einer Sekunde sind die hauptsächlichen Merkmale dieser Technik. Mitteldruck-Gasentladungslampen emittieren Licht vom kurzwelligen UV über den sichtbaren Bereich bis hin zum langwelligen IR. Die Wirkung des Reflektors bei solchen UV-Aggregaten ist nicht zu unterschätzen. Je nach Form und Geometrie beträgt sein Anteil an der auf dem Substrat wirksamen Gesamtemission 50 bis 90%. Im Falle von selektiver Reflektion kann auch das Verhältnis von UV-Licht zu IR-Wärmeanteil gesteuert werden. In diesem Zusammenhang wurde bereits vorgeschlagen, flexible Metallstreifen als Reflektor gehäusefest einzuspannen. Als nachteilig hierbei wird empfunden, dass es damit nicht möglich ist, eine spezifische Reflektorgeometrie in einfacher Weise anzupassen. Außerdem erscheint es fraglich, ob sich solche Konstruktionen im industriellen Dauerbetrieb unter hoher Temperaturbeanspruchung bewähren können.The UV drying and crosslinking of paints, inks and adhesives utilizing the energy content of light quanta in the UV light range with the help of long-stretched medium-pressure gas discharge lamps has been widely used in industry for over 30 years in the printing, packaging and surface industries. Solvent-free process and the availability of high crosslinking densities with processing times in a fraction of a second are the main features of this technique. Medium-pressure gas discharge lamps emit light from the short-wave UV over the visible range up to the long-wave IR. The effect of the reflector in such UV aggregates should not be underestimated. Depending on the shape and geometry, its proportion of the total emission acting on the substrate is 50 to 90%. In the case of selective reflection, the ratio of UV light to IR heat share can also be controlled. In this context, it has been proposed to clamp flexible metal strips as a reflector fixed to the housing. A disadvantage here is that it is thus not possible to adapt a specific reflector geometry in a simple manner. In addition, it seems questionable whether such constructions can prove themselves in industrial continuous operation under high temperature stress.

Die US-PS 5,444,576 zeigt einen Bestrahlungsapparat beispielsweise zur Bestrahlung von gedruckten Leiterplatten mit einer Halteplatte für einen Kühltank an einem Reflektorkörper für eine Quecksilberdampflampe und einem Rahmen als Blende an der Unterseite des Reflektorkörpers. Der Kühltank ist in einem mehrteiligen Reflektorprofil eingesetzt und dabei nur gegen seitliches Herausfallen gesichert.The U.S. Patent 5,444,576 shows an irradiation apparatus, for example, for irradiation of printed circuit boards with a holding plate for a cooling tank to a reflector body for a mercury vapor lamp and a frame as a diaphragm on the underside of the reflector body. The cooling tank is used in a multi-part reflector profile and secured only against lateral falling out.

Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, ein Aggregat der eingangs angegebenen Art dahingehend zu verbessern, dass die im Stand der Technik aufgetretenen Nachteile vermieden werden und ein variabler Einsatz möglich ist.Proceeding from this, the present invention seeks to improve an aggregate of the type specified in that the disadvantages encountered in the prior art are avoided and a variable use is possible.

Zur Lösung dieser Aufgabe wird die im Patentanspruch 1 angegebene Merkmalskombination vorgeschlagen. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den abhängigen Ansprüchen.To solve this problem, the feature combination specified in claim 1 is proposed. Advantageous embodiments and modifications of the invention will become apparent from the dependent claims.

Dementsprechend wird erfindungsgemäß vorgeschlagen, dass die Reflektoranordnung ein in dem Gehäuse gehaltenes Trägerprofil und ein damit über formschlüssige Verbindungsflächen lösbar verbindbares und im Bereich der Verbindungsflächen über Schraubverbindungen als Verbindungsmittel in gegenseitiger Flächenanlage gehaltenes, als formstabiles Formteil ausgebildetes und somit austauschbares Reflektorprofil aufweist. Dadurch wird auf einfache Weise ein modularer Aufbau geschaffen, der es erlaubt, das Bestrahlungsprofil optimal an die jeweiligen Prozessverhältnisse anzupassen. Durch die Verwendung von Profilkörpern wird über die Länge der Lampe eine definierte Geometrie vorgegeben, die durch die Auswechselbarkeit auch kurzfristig hinsichtlich verschiedener Parameter wie der chemischen Formulierung des zu härtenden Beschichtungsmittels, des noch akzeptablen Wärmeeintrags auf das Substrat und der Bestrahlungsdauer bzw. -dosis abgestimmt werden kann. Dabei ergeben sich die richtigen Auslegungen häufig erst nach umfangreichen Versuchen. Dies kann durchaus kurz vor oder erst während der Inbetriebnahme beispielsweise in der Druckanlage vor Ort erfolgen. Durch die Variabilität in der Reflektorgeometrie werden kostspielige Risiken vermieden. Änderungen im Produkt oder der Beschichtungschemie kann durch Wahl des geeigneten Reflektorprofils selektiv Rechnung getragen werden. Dabei wird durch den Einsatz von massiven Profilen eine hohe thermische Standfestigkeit gewährleistet. Außerdem sind die Reflektorprofile für eine Wartung bzw. Reinigung leicht zugänglich.Accordingly, it is proposed according to the invention that the reflector arrangement has a carrier profile held in the housing and a reflector profile which is releasably connectable via positive connection surfaces and held in the area of the connection surfaces via screw connections as a connection means in mutual surface contact, formed as a dimensionally stable molded part and thus replaceable. As a result, a modular structure is created in a simple manner, which makes it possible to optimally adapt the irradiation profile to the respective process conditions. The use of profiled bodies predefines a defined geometry over the length of the lamp, which can also be adapted at short notice in terms of various parameters such as the chemical formulation of the coating agent to be cured, the still acceptable heat input to the substrate and the irradiation duration or dose can. This often results in the correct interpretations only after extensive trials. This can certainly be done shortly before or during commissioning, for example, in the printing plant on site. Variability in reflector geometry avoids costly risks. Changes in the product or coating chemistry can be selectively accommodated by choosing the appropriate reflector profile. The use of solid profiles ensures high thermal stability. In addition, the reflector profiles are easily accessible for maintenance or cleaning.

Vorteilhafterweise sind mehrere Reflektorprofile mit unterschiedlichen Reflektorgeometrien und/oder Oberflächenbeschichtungen als Baukastensystem wahlweise mit dem Trägerprofil verbindbar, wobei durch einheitliche Verbindungsflächen unabhängig von der Reflektorgeometrie eine einfache Montage gewährleistet ist.Advantageously, a plurality of reflector profiles with different reflector geometries and / or surface coatings as a modular system can be selectively connected to the carrier profile, wherein a uniform assembly is ensured by uniform connection surfaces regardless of the reflector geometry.

Eine weitere Verbesserung sieht vor, dass das Reflektorprofil und das Trägerprofil über die Verbindungsflächen miteinander in flächigen Wärmeleitkontakt bringbar sind.A further improvement provides that the reflector profile and the carrier profile can be brought together via the connecting surfaces in flat Wärmeleitkontakt.

Eine Montagevereinfachung ergibt sich dadurch, dass die Verbindungsmittel von der dem Reflektorprofil abgewandten Rückseite des Trägerprofils her betätigbar sind. Günstig ist es auch, wenn die Verbindungsmittel durch beispielsweise verschließbare Gehäuseklappen von der Außenseite des Gehäuses her zugänglich sind.A simplification of the installation results from the fact that the connecting means can be actuated by the back of the carrier profile facing away from the reflector profile. It is also favorable if the connecting means are accessible from, for example, closable housing flaps from the outside of the housing.

Eine weitere vorteilhafte Ausführung sieht vor, dass die Verbindungsmittel in Profilrichtung gesehen vorzugsweise über eine Langlochlagerung ein thermisches Ausgleichsspiel zwischen Reflektorprofil und Trägerprofil erlauben.A further advantageous embodiment provides that the connecting means seen in the profile direction preferably allow a thermal compensation clearance between reflector profile and carrier profile via a slot bearing.

In baulich vorteilhafter Realisierung sind die Verbindungsmittel durch schaftseitig vorzugsweise auf Anschlag in das Reflektorprofil einschraubbare und kopfseitig vorzugsweise über Feder- und/oder Gleitscheiben an dem Trägerprofil abgestützte Schraubbolzen gebildet.In structurally advantageous realization, the connecting means are formed by shaft side preferably to stop in the reflector profile and head side preferably supported by spring and / or sliding discs on the support profile bolted.

Vorteilhafterweise ist das Trägerprofil durch eine Kühlung, insbesondere eine Wasserkühlung mit Kühlmittel beaufschlagbar. Dies lässt sich dadurch verwirklichen, dass das Trägerprofil mit Profilkanälen zur Durchleitung von Kühlmittel versehen ist. Dadurch ist es auch möglich, die Reflektorprofile ohne Unterbrechung des Kühlsystems in kurzer Zeit auszutauschen.Advantageously, the carrier profile can be acted upon by a cooling, in particular a water cooling with coolant. This can be realized in that the carrier profile is provided with profile channels for the passage of coolant. This also makes it possible to replace the reflector profiles without interrupting the cooling system in a short time.

Durch entsprechende Wandstärken ist es möglich, dass das Reflektorprofil eine von seiner Verbindungsfläche mit dem Trägerprofil abgewandte und von deren Konturverlauf abweichende gekrümmte Reflektorfläche aufweist. Die Verbindungsfläche kann daher für eine standardisierte Aufnahme einheitlich ausgebildet werden, während die Reflektorfläche selektiv an die Bestrahlungsbedingungen angepasst ist.By appropriate wall thicknesses, it is possible that the reflector profile facing away from its connecting surface with the carrier profile and has a curved reflector surface deviating from its contour profile. The bonding surface can therefore be made uniform for a standardized recording, while the reflector surface is selectively adapted to the irradiation conditions.

Um auch eine spektrale Beeinflussung zu ermöglichen, ist es vorteilhaft, wenn das Reflektorprofil an seiner der UV-Lampe zugewandten Profilseite mit einer Reflexionsbeschichtung versehen ist.In order to allow a spectral influence, it is advantageous if the reflector profile is provided on its side facing the UV lamp profile side with a reflection coating.

Für eine hohe Belastungs- bzw. Standfestigkeit ist es von Vorteil, wenn das Reflektorprofil als massiver Körper aus einem Vollmaterial gebildet ist. Herstellungstechnisch ist es hierbei vorteilhaft, wenn das Reflektorprofil und das Trägerprofil als Strangpressprofilteile vorzugsweise aus Aluminium bestehen.For a high load or stability, it is advantageous if the reflector profile is formed as a solid body of a solid material. In terms of production, it is advantageous if the reflector profile and the carrier profile as extruded profile parts are preferably made of aluminum.

Eine weitere Vereinfachung auch hinsichtlich der erforderlichen Apparaturen für die Reflektorbeschichtung ergibt sich dadurch, dass mehrere Reflektorprofile als Profilstrang stirnseitig zusammengesetzt sind. Dabei sollte gewährleistet sein, dass die Stoßstellen, welche einen geringeren Reflexionswert aufweisen können, bei paarweiser Reflektoranordnung versetzt sind und sich nicht gegenüberliegen.A further simplification also with regard to the required equipment for the reflector coating results from the fact that several reflector profiles are assembled as a profile strand frontally. It should be ensured that the joints, which may have a lower reflection value, are offset with pairwise reflector arrangement and not opposite each other.

Zur Verbesserung des Wärmeübergangs kann es von Vorteil sein, wenn zwischen den Verbindungsflächen von Reflektorprofil und Trägerprofil ein Wärmeleitmittel, insbesondere Wärmeleitpaste eingebracht ist.To improve the heat transfer, it may be advantageous if between the connecting surfaces of reflector profile and carrier profile, a heat conducting, in particular thermal paste is introduced.

Vorteilhafterweise sind jeweils ein Trägerprofil und ein zugeordnetes Reflektorprofil paarweise beidseitig einer Längsmittelebene der UV-Lampe angeordnet. Für eine Verschlussfunktion der durchstrahlten Gehäuseöffnung ist es möglich, dass zwei Reflektorprofile zusammen mit zugeordneten Trägerprofilen um jeweils eine in Profilrichtung verlaufende Achse gegeneinander schwenkbeweglich in dem Gehäuse angeordnet sind.Advantageously, in each case a carrier profile and an associated reflector profile are arranged in pairs on both sides of a longitudinal center plane of the UV lamp. For a closure function of the irradiated housing opening, it is possible for two reflector profiles, together with associated carrier profiles, to be arranged in the housing so as to be pivotable relative to each other about an axis extending in the profile direction.

Im Folgenden wird die Erfindung anhand eines in der Zeichnung schematisch dargestellten Ausführungsbeispiels näher erläutert. Es zeigen

Fig. 1
ein UV-Bestrahlungsaggregat zur Trocknung von Druckbahnen im Querschnitt; und
Fig. 2
eine ausschnittsweise Vergrößerung einer Schraubverbindung im Bereich einer Reflektoranordnung des Aggregats nach Fig.1.
In the following the invention will be explained in more detail with reference to an embodiment schematically illustrated in the drawing. Show it
Fig. 1
a UV irradiation unit for drying printed webs in cross section; and
Fig. 2
a partial enlargement of a screw in the region of a reflector assembly of the unit after Fig.1 ,

Das in der Zeichnung dargestellte UV-Bestrahlungs-aggregat besteht im Wesentlichen aus einem kastenförmigen Gehäuse 10, einer darin angeordneten stabförmigen UV-Lampe 12, einer Reflektoranordnung 14 zur Reflexion des in das Gehäuse 10 abgestrahlten UV-Lichts auf eine bodenseitige Gehäuseöffnung 16 und einem Absorber 18 zur Ableitung von Verlustwärme über eine nicht gezeigte Kühleinrichtung.The UV irradiation unit shown in the drawing consists essentially of a box-shaped housing 10, arranged therein a rod-shaped UV lamp 12, a reflector assembly 14 for reflecting the radiated into the housing 10 UV light on a bottom housing opening 16 and an absorber 18 for dissipating heat loss via a cooling device, not shown.

Die UV-Lampe 12 ist als zweiendige Mitteldruck-Gasentladungslampe in der Mittellängsebene 20 des Gehäuses 10 angeordnet und gibt ihre Strahlung über die Gehäuseöffnung 16 auf die darunter vorbeigeführte Substratbahn bzw. das zu bestrahlende Objekt ab. Um die Bestrahlung des Objekts zu erhöhen, ist die UV-Lampe 12 in ihrem in das Gehäuseinnere weisenden Sektor über ihre Länge von der Reflektoranordnung 14 umgeben, wobei das reflektierte Licht je nach Reflektorgeometrie divergent, parallel oder gebündelt durch die Gehäuseöffnung 16 hindurch abgestrahlt wird. Denkbar ist auch, dass in Reflektorteilbereichen unterschiedliche Reflexionsgeometrien realisiert sind.The UV lamp 12 is arranged as a double-ended medium-pressure gas discharge lamp in the central longitudinal plane 20 of the housing 10 and emits its radiation via the housing opening 16 to the substrate web guided underneath or to the object to be irradiated. In order to increase the irradiation of the object, the UV lamp 12 is surrounded in its pointing into the housing interior sector over its length by the reflector assembly 14, wherein the reflected light depending on the reflector geometry divergent, parallel or bundled through the housing opening 16 is radiated. It is also conceivable that different reflection geometries are realized in reflector subregions.

Zur wahlweisen Einstellung der Reflektoreigenschaften besteht die Reflektoranordnung 14 aus Trägerprofilen 22 und lösbar damit verbundenen Reflektorprofilen 24. Die Träger- und Reflektorprofile sind paarweise beidseitig der Längsmittelebene 20 des Gehäuses 10 bzw. der UV-Lampe 12 angeordnet, wobei die Profilrichtung parallel zur Lampenachse verläuft. Sie bestehen als massive Strangpressprofilteile aus Aluminium, so dass speziell die Reflektorprofile 24 als komplex konturierte Formteile formstabil ausgebildet sind. Dabei ist es möglich, unterschiedliche Reflektorprofile 24 nach Art eines Baukastensystems einzusetzen. In Fig.1 ist dies der besseren Veranschaulichung halber für zwei Reflektorgeometrien links und rechts der Mittelebene 20 gezeigt, wobei im praktischen Einsatz in der Regel profilgleiche Teile spiegelsymmetrisch angeordnet sind, grundsätzlich jedoch auch asymmetrische Anordnungen möglich sind.For optional adjustment of the reflector properties, the reflector assembly 14 consists of carrier profiles 22 and reflector profiles 24 releasably connected thereto. The carrier and reflector profiles are arranged in pairs on both sides of the longitudinal center plane 20 of the housing 10 or UV lamp 12. wherein the profile direction is parallel to the lamp axis. They consist of massive extruded aluminum parts, so that especially the reflector profiles 24 are formed dimensionally stable as a complex contoured moldings. It is possible to use different reflector profiles 24 in the manner of a modular system. In Fig.1 this is shown for better illustration half of two reflector geometries left and right of the median plane 20, wherein in practice usually the same profile parts are arranged mirror-symmetrically, but in principle asymmetric arrangements are possible.

Die Reflektorprofile 24 und Trägerprofile 22 sind über formkomplementäre Verbindungsflächen 26, 28 formschlüssig in großflächigen Wärmeleitkontakt bringbar. Zur effektiven Wärmeabfuhr sind die Trägerprofile 22 über Profilkanäle 30 für die Durchleitung von Kühlwasser an die Kühleinrichtung anschließbar. Auf diese Weise ist es möglich, mit hohen Lampenleistungen im Bereich von einigen 10 kW zu arbeiten.The reflector profiles 24 and carrier profiles 22 can be brought into positive contact with large-area heat-conducting contact via complementary complementary connection surfaces 26, 28. For effective heat dissipation, the carrier profiles 22 can be connected via profile channels 30 for the passage of cooling water to the cooling device. In this way it is possible to work with high lamp powers in the range of a few 10 kW.

Das Trägerprofil 22 und das Reflektorprofil 24 sind im Bereich der Verbindungsflächen 26, 28 über Schraubverbindungen 32 in gegenseitiger Anlage gehalten. Um die Montage bzw. den Reflektoraustausch am Einsatzort beispielsweise in einer Druckmaschine zu vereinfachen, ist es zweckmäßig, wenn die Schraubverbindungen 32 durch Gehäuseklappen 34 von der Gehäuseaußenseite her zugänglich sind.The carrier profile 22 and the reflector profile 24 are held in the region of the connecting surfaces 26, 28 via screw 32 in mutual contact. In order to simplify the assembly or the reflector exchange at the site, for example, in a printing press, it is expedient if the screw 32 are accessible by housing flaps 34 of the housing outside.

Wie in Fig.2 gezeigt, sind die Schraubverbindungen 32 durch Stehbolzen 36 gebildet, welche von der Rückseite 38 des Trägerprofils 22 her rückseitig in das Reflektorprofil 24 einschraubbar sind. Im Verbindungszustand sind die Stehbolzen 36 mit ihrem abgestuften Gewindeschaft 40 auf Anschlag in das Reflektorprofil 24 eingedreht. Der Schraubkopf 42 ist dabei über Tellerfedern 44 und Gleitscheiben 46 mit definiertem Kraftschluß an dem Trägerprofil 22 abgestützt. Um ein thermisches Ausgleichsspiel zu ermöglichen, ist der Stufendurchbruch 48 in Profilrichtung gesehen als Langloch ausgebildet.As in Fig.2 shown, the screw 32 are formed by studs 36 which are screwed from the back 38 of the support section 22 forth in the reflector profile 24. In the connection state, the stud bolts 36 are screwed with their stepped threaded shaft 40 to stop in the reflector profile 24. The screw head 42 is supported by disc springs 44 and sliding discs 46 with defined adhesion to the support section 22. In order to enable a thermal compensation game, the step opening 48 is seen in the profile direction formed as a slot.

Aufgrund der frei formbaren Profilgeometrie kann die der UV-Lampe 12 zugewandte Reflektorfläche 50 der Reflektorprofile 24 unabhängig von der Profilkontur der Verbindungsfläche 26 gestaltet werden. Zum Einsatz kommen elliptische, parabolische und kreisförmige Reflektorgeometrien wie auch Kombinationen davon. Denkbar sind auch Reflektorflächen 50 mit Freilinienformen.Because of the freely deformable profile geometry, the reflector surface 50 of the reflector profiles 24 facing the UV lamp 12 can be designed independently of the profile contour of the connection surface 26. Elliptic, parabolic and circular reflector geometries as well as combinations thereof are used. Also conceivable are reflector surfaces 50 with Freilinienformen.

Durch eine zusätzliche Oberflächenbeschichtung 52 der Reflektorprofile 24 kann der spektrale Bereich des reflektieren Lichts beeinflusst werden. Reinstaluminium-Oberflächen reflektieren das gesamte Spektrum, während so genannte Kaltlichtspiegel-Beschichtungen je nach Ausführung nur ausgewählte spektrale Bandbreiten im UV-Bereich reflektieren. Die in der Reflektoranordnung 14 absorbierte Wärme kann dabei zusätzlich zu der Wasserkühlung auch durch eine Luftkühlung mit Absaugung durch den Abluftkanal 54 hindurch abgeführt werden.By an additional surface coating 52 of the reflector profiles 24, the spectral range of the reflected light can be influenced. High-purity aluminum surfaces reflect the entire spectrum, while so-called cold-mirror coatings, depending on the design, only reflect selected spectral bandwidths in the UV range. The heat absorbed in the reflector assembly 14 can be dissipated by the air cooling with suction through the exhaust duct 54 in addition to the water cooling.

Die UV- und IR-Emission der Gasentladungslampe 12 kann aus physikalischen Gründen nicht spontan ein- und ausgeschaltet werden. Daher ist es vorgesehen, die Reflektoranordnung 14 beim Anfahren oder bei Betriebsunterbrechungen in eine Standby-Stellung zu bringen, in der die Gehäuseöffnung 16 gegen Strahlungsdurchtritt mechanisch verschlossen ist. Zu diesem Zweck sind die Trägerprofile um eine parallel zur Profilrichtung verlaufende Schwenk- bzw. Drehachse gegeneinander bewegbar, wobei die IR-Leistung von dem gekühlten Absorber 18 aufgenommen wird. Aus dieser Stellung kann ohne nennenswerten Zeitverlust durch Betätigung des Klapp- bzw. Drehmechanismus in den Produktionsmodus gewechselt werden. Anstelle eines beweglichen Reflektors ist auch der Einsatz eines gesonderten Verschluss-Systems möglich.The UV and IR emission of the gas discharge lamp 12 can not be switched on and off spontaneously for physical reasons. Therefore, it is intended to bring the reflector assembly 14 during startup or interruptions in operation in a standby position in which the housing opening 16 is mechanically sealed against radiation passage. For this purpose, the carrier profiles are movable relative to one another about a pivot axis or axis of rotation running parallel to the profile direction, the IR power being absorbed by the cooled absorber 18. From this position can be changed without significant loss of time by pressing the folding or rotating mechanism in the production mode. Instead of a movable reflector and the use of a separate closure system is possible.

Claims (17)

  1. Irradiation unit for UV irradiation of substrates, particularly those in web form, having a box-shaped housing (10), a rod-shaped UV lamp (12) disposed therein, and a reflector arrangement (14) that extends along the UV lamp (12), characterized in that the reflector arrangement (14) has a support profile (22) held in the housing (10) and a reflector profile (24) configured as a shaped part having a stable shape, which support profile and reflector profile can be releasably connected by way of form-locking connection surfaces (26, 28) and held in contact with one another in the region of the connection surfaces by way of screw connections as connection means (32).
  2. Irradiation unit according to claim 1, characterized in that several reflector profiles (24) having different reflector geometries and/or surface coatings as a modular system can be selectively connected with the support profile (22).
  3. Irradiation unit according to claim 1 or 2, characterized in that the reflector profile (24) and the support profile (22) can be brought into two-dimensional heat conduction contact with one another.
  4. Irradiation unit according to one of claims 1 to 3, characterized in that the connection means (32) can be actuated from the back side (38) of the support profile (22), which back side faces away from the reflector profile (24).
  5. Irradiation unit according to one of the claims 1 to 4, characterized in that the connection means (32) are accessible from the outside of the housing (10), through housing flaps (34) that can be closed, for example.
  6. Irradiation unit according to one of claims 1 to 5, characterized in that the connection means (32) allow thermal equalization play between reflector profile (24) and support profile (22), seen in the profile direction, preferably by way of an oblong hole mounting (48).
  7. Irradiation unit according to one of claims 1 to 6, characterized in that the connection means (32) are formed by screw bolts (36) that can be screwed into the reflector profile (24) on the shaft side, preferably all the way to contact, and are supported on the support profile (22), preferably by way of spring washers and/or slide washers (44, 46), on the head side.
  8. Irradiation unit according to one of claims 1 to 7, characterized in that the support profile (22) can have coolant applied to it by means of a cooling system, particularly a water cooling system.
  9. Irradiation unit according to one of claims 1 to 8, characterized in that the support profile (22) is provided with profile channels (30) for conducting coolant through.
  10. Irradiation unit according to one of claims 1 to 9, characterized in that the reflector profile (24) has a curved reflector surface (50), facing away from its connection surface (26) with the support profile (22) and deviating from the contour shape of this surface.
  11. Irradiation unit according to one of claims 1 to 10, characterized in that the reflector profile (24) is provided with a reflection coating (52) on its profile side that faces the UV lamp (12).
  12. Irradiation unit according to one of claims 1 to 11, characterized in that the reflector profile (24) is formed as a solid body from a bulk material.
  13. Irradiation unit according to one of claims 1 to 12, characterized in that the reflector profile (24) and the support profile (22) preferably consist of aluminum, as extruded profile parts.
  14. Irradiation unit according to one of claims 1 to 13, characterized in that several reflector profiles (24) are put together at their front faces, as a profile train.
  15. Irradiation unit according to one of claims 1 to 14, characterized in that a heat conduction means, particularly heat conduction paste, is introduced between the connection surfaces (26, 28) of reflector profile (24) and support profile (22).
  16. Irradiation unit according to one of claims 1 to 15, characterized in that a support profile (22) and a related reflector profile (24), in each instance, are disposed in pairs on both sides of a longitudinal center plane (20) of the UV lamp (12).
  17. Irradiation unit according to one of claims 1 to 16, characterized in that two reflector profiles (24) together with their related support profiles (22) are disposed in the housing (10) so as to pivot relative to one another about an axis that runs in the profile direction, in each instance.
EP05767850A 2004-08-06 2005-07-19 Irradiation unit Active EP1779050B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004038592A DE102004038592A1 (en) 2004-08-06 2004-08-06 irradiation unit
PCT/EP2005/007836 WO2006015694A1 (en) 2004-08-06 2005-07-19 Irradiation unit

Publications (2)

Publication Number Publication Date
EP1779050A1 EP1779050A1 (en) 2007-05-02
EP1779050B1 true EP1779050B1 (en) 2012-02-22

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EP05767850A Active EP1779050B1 (en) 2004-08-06 2005-07-19 Irradiation unit

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US (1) US7858956B2 (en)
EP (1) EP1779050B1 (en)
AT (1) ATE546702T1 (en)
DE (1) DE102004038592A1 (en)
DK (1) DK1779050T3 (en)
WO (1) WO2006015694A1 (en)

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Also Published As

Publication number Publication date
US7858956B2 (en) 2010-12-28
EP1779050A1 (en) 2007-05-02
WO2006015694A1 (en) 2006-02-16
ATE546702T1 (en) 2012-03-15
DE102004038592A1 (en) 2006-03-16
US20080277600A1 (en) 2008-11-13
DK1779050T3 (en) 2012-06-18

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