EP2786807B1 - Device for innertion with UV irradiation in open throughput systems - Google Patents

Device for innertion with UV irradiation in open throughput systems Download PDF

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EP2786807B1
EP2786807B1 EP14000487.0A EP14000487A EP2786807B1 EP 2786807 B1 EP2786807 B1 EP 2786807B1 EP 14000487 A EP14000487 A EP 14000487A EP 2786807 B1 EP2786807 B1 EP 2786807B1
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EP2786807A1 (en
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Mehnert Prof.Dr. Reiner
Riedel Dr. Carsten
Rolf Dr. Schubert
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Iot - Innovative Oberflaechentechnologien GmbH
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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
    • B05D3/04—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
    • B05D3/0486—Operating the coating or treatment in a controlled atmosphere
    • 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
    • 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
    • B05D2252/00—Sheets
    • B05D2252/02—Sheets of indefinite length
    • 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
    • B05D2252/00—Sheets
    • B05D2252/04—Sheets of definite length in a continuous process

Definitions

  • the invention relates to a device for inerting the irradiation zone in oxygen-sensitive UV curing and -Sober lake ModelltechniksRISen, which take place in a continuous operation.
  • Oxygen-sensitive chemical and physical surface processes such as the photochemical polymerization of acrylate-based paints and their surface structuring by means of short-wave UV radiation, must be carried out in as low-oxygen atmosphere as possible in order to avoid such effects as Peroxyradikal- and ozone formation and energy losses.
  • inerting technologies are known to be used.
  • a reaction space with an inert gas such as nitrogen, argon or CO 2 , but preferably pure nitrogen, rinsed to displace atmospheric oxygen.
  • inerting technology in the field of UV curing is state of the art in order to obtain coatings of high quality.
  • Further advantages of inertization have been the ability to reduce the photoinitiator content by more than 80% and to save energy by reducing the electrical UV lamp power by 50%, or alternatively, increasing the product throughput speed as an option.
  • the residual oxygen content in the inert gas of the channel is meanwhile also measured and thus the inert gas feed is regulated.
  • the inert gas purging of the irradiation channel is a metastable aerodynamic system and not only the lowest possible residual oxygen content, but a largely homogeneous inert gas atmosphere is required, except for the retention of atmospheric oxygen in the channel constructive measures for a uniform inert gas and avoidance to meet flow profile disturbances in the channel.
  • the inert gas is fed through a so-called volume filling nozzle, which can also work on the basis of a porous gas distribution element over the entire channel width.
  • a so-called “squeegee” or “peeling nozzle” is used for better retention of the atmospheric oxygen and for “peeling off” the oxygen from the surface of the coating.
  • the amount of inert gas fed in must be matched to the throughput speed of the product - which is best regulated at a variable speed - in order to avoid a product outflow-side air inflow.
  • product inlet side gas barrier are usually a simple height-adjustable aperture over the entire channel width or even a labyrinth ( WO 2005 075111 A1 ) and product outlet side a rubber sealing lip, a brush element or also a labyrinth for a non-contact execution, wherein the labyrinths an inert gas feed and residual oxygen measurement can take place ( WO 2005 075111 A1 ).
  • the residual oxygen measurement in the inert gas of the irradiation zone is due to its large measuring range (1 ppm to> 21% O 2 ) and its short response time even to Inertgasmengenregelung.
  • the gas is continuously sucked through the measuring cell by means of a small gas pump via a tube probe in the channel ceiling - usually arranged in the middle of the channel.
  • UV inerting systems on the market function in principle, they are susceptible and inadequate with respect to the stability of the inert regime - laterally uniform residual oxygen concentration and small variations over time in the passage - as well as inert gas consumption.
  • Object of the present invention is therefore to propose a device for inerting the irradiation zone, with the lowest inert gas consumption, a stable and homogeneous inerting of the irradiation zone is achieved, so that UV curing and photochemical surface structuring can be done under technically advantageous conditions.
  • Essential inventive features are that the irradiation channel is used in a flat as possible embodiment, and thus a high relative velocity between the coated product surface and inert gas is formed, but does not affect the uniformity of the coating, so as to have a positive effect on the O 2 -Stoffübergangskostory and to achieve a rapid removal of the exchanged oxygen and at the same time to provide a directed inert gas flow, whereby vertical and horizontal turbulence, which can lead to air inflow, are largely excluded.
  • the device according to the invention has an inerted inlet section in front of the UV lamp with such a length that the required residence time in the inert gas atmosphere is available for removing oxygen from and from the coating, whereby such a flow zone also has a positive effect on the flow profile and thus affecting the uniformity of the residual oxygen distribution.
  • the product inlet and outlet side gap adjustment is matched in terms of resistance so that the outlet side, the larger gas barrier arises and thus the inert gas in countercurrent to the product conveying direction must emerge on the product side.
  • the product inlet side is a labyrinth, as in WO 2005 075111 A1 suggested, is not appropriate.
  • the adjustment of the residual oxygen level and the Inertgas kits results in a speed-dependent gap height of the inlet aperture, which recommends a speed-dependent control of the gap height analogous to the inert gas via the residual oxygen measurement.
  • the device according to the invention has a diffuser-like beveled inlet aperture, by means of which tear-off turbulences and dead zones are reduced, Furthermore, the device has a segmentation of the inlet aperture and the outlet barrier (sealing lip or labyrinth) in order to exclude lateral zones of lower resistance than on the product surface by adaptation to the product width and thus to counteract a negative influence on the gas flow in the channel and Heileinsaugerscheinept.
  • the nip side of the runner segments of a web equipment is provided with a soft sealing material such as felt or a special closed pored rubber lip to provide a better sealing effect on a chill roll, but to avoid web breakage through the segment when the web is running sideways.
  • a soft sealing material such as felt or a special closed pored rubber lip to provide a better sealing effect on a chill roll, but to avoid web breakage through the segment when the web is running sideways.
  • Another feature to solve the problem is the choice of a suitable transport system for cargo handling equipment and a coordinated effective number and arrangement of the inert gas feed nozzles. If e.g. For flat sheets, a closed conveyor belt is selected, then the tape should have the lowest possible surface roughness. For thicker plates, which can entrain a relatively large amount of air, it is recommended to use a roller conveyor or a rod or mesh belt and a bottom nozzle in the inlet region at generally lower conveyor speeds than 20 m / min.
  • An inerting device is used for pure UV coating curing on a film web with only one medium pressure mercury lamp of a specific electrical power of 200 W / cm.
  • the clear channel height is 10 mm and the clear channel width is 600 mm.
  • the 500 mm wide web passes through the device at 100 m / min.
  • 300 ppm residual oxygen content is registered at a nitrogen flow of 9 Nm 3 / h.
  • a minimum residence time of 250 ms would be required.
  • An attachment according to Fig. 2 is used for the physical matting of UV varnish-coated MDF sheets by means of 172 nm excimer photons and subsequent curing with long-wave UV light of a 160 W / cm medium pressure mercury lamp.
  • the clear Inertkanal altar is 30 mm and the clear channel width 1400 mm.
  • the plates with dimensions (LxWxH) 2000x1200x22 are moved at a speed of 10 m / min on a metal mesh belt through the VUV / UV system.
  • Microstructuring of the lacquer surface by photochemical microfilling is very sensitive to an inhomogeneous residual oxygen content in the irradiation zone, since the 172 nm photons are absorbed by oxygen under ozone formation and in the problem areas a VUV dose reduction occurs, which leads to structural influence and thus to visible local gloss differences.
  • the inertizing nitrogen is fed in via the excimer lamp (7), a fogging nozzle (4) and optionally an underfloor nozzle (5).
  • a fogging nozzle (4) for this purpose, the effect of a different length inlet zone and the inlet gap setting according to Fig. 3 demonstrated.
  • On the outlet side a sealing lip forms the nitrogen barrier.
  • the oxygen measuring point is located shortly before the excimer lamp.

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

Description

Die Erfindung betrifft eine Vorrichtung zur Inertisierung der Bestrahlungszone bei sauerstoffempfindlichen UV-Härtungs- und -Oberflächenstrukturierungsprozessen, die im Durchlaufbetrieb erfolgen.The invention relates to a device for inerting the irradiation zone in oxygen-sensitive UV curing and -Soberflächenstrukturierungsprozessen, which take place in a continuous operation.

Sauerstoffempfindliche chemische und physikalische Oberflächenprozesse, wie zum Beispiel die photochemische Polymerisation von acrylatbasierenden Lacken und deren Oberflächenstrukturierung mittels kurzwelliger UV-Strahlung, müssen in möglichst sauerstoffarmer Atmosphäre durchgeführt werden, um solche Effekte wie Peroxyradikal- und Ozonbildung sowie Energieverluste zu vermeiden.Oxygen-sensitive chemical and physical surface processes, such as the photochemical polymerization of acrylate-based paints and their surface structuring by means of short-wave UV radiation, must be carried out in as low-oxygen atmosphere as possible in order to avoid such effects as Peroxyradikal- and ozone formation and energy losses.

Dazu werden bekanntermaßen sogenannte Inertisierungstechnologien angewendet.
Dabei wird ein Reaktionsraum mit einem Inertgas wie Stickstoff, Argon oder CO2, vorzugsweise aber Reinststickstoff, zur Verdrängung von Luftsauerstoff gespült.For this purpose, so-called inerting technologies are known to be used.
In this case, a reaction space with an inert gas such as nitrogen, argon or CO 2 , but preferably pure nitrogen, rinsed to displace atmospheric oxygen.

So wurde bereits vor etwa einem Vierteljahrhundert die Inertisierung in der UV-Technik bei der äußerst sauerstoffempfindlichen Polymerisation von Silikonacrylaten, der sogenannten Silikonisierung von Trennbeschichtungen, eingeführt ( DE 3416502 A1 und EP 0161540 A1 ).Thus, about a quarter of a century ago, the inerting in UV technology was introduced in the extremely oxygen-sensitive polymerization of silicone acrylates, the so-called siliconization of release coatings ( DE 3416502 A1 and EP 0161540 A1 ).

Inzwischen ist die Inertisierungstechnologie im Bereich der UV-Härtung Stand der Technik, um Beschichtungen mit hoher Qualität zu erhalten.
Als weitere Vorteile der Inertisierung stellten sich die Möglichkeit der Reduzierung des Photoinitiatorgehaltes um mehr als 80% und eine Energieeinsparung durch geringere elektrische UV-Lampenleistung um 50% oder alternativ eine mögliche Erhöhung der Produktdurchlaufgeschwindigkeit heraus.Meanwhile, inerting technology in the field of UV curing is state of the art in order to obtain coatings of high quality.
Further advantages of inertization have been the ability to reduce the photoinitiator content by more than 80% and to save energy by reducing the electrical UV lamp power by 50%, or alternatively, increasing the product throughput speed as an option.

Allen dazu bisher erfundenen und entwickelten Vorrichtungen gemeinsam ist die Einspeisung des Inertgases durch Einströmöffnungen wie z.B. Düsen in die Reaktionskammer bzw. den Kanal und, da es sich bei Anlagen mit kontinuierlichem Produktdurchlauf um offene Systeme handelt, die Ausstattung mit produktein- und -auslaufseitigen Gasbarrieren zur Minimierung des Inertgasverbrauches.Common to all invented and developed devices to date is the feeding of the inert gas through inlet openings such. Nozzles in the reaction chamber or channel and, since systems with continuous product flow are open systems, the equipment with gas inlet and outlet side barriers to minimize the inert gas consumption.

In den meisten Anwendungsfällen der inertisierten UV-Härtung und Excimer-VUV-Mattierung wird inzwischen auch der Restsauerstoffgehalt im Inertgas des Kanals gemessen und damit die Inertgaseinspeisung geregelt.In most applications of inerted UV curing and excimer VUV matting, the residual oxygen content in the inert gas of the channel is meanwhile also measured and thus the inert gas feed is regulated.

Da es sich bei der Inertgasspülung des Bestrahlungskanals aber um ein metastabiles aerodynamisches System handelt und nicht nur ein möglichst niedriger Restsauerstoffgehalt, sondern eine weitgehend homogene InertgasAtmosphäre erforderlich ist, sind außer zur Rückhaltung des Luftsauerstoffeintrages in den Kanal konstruktive Maßnahmen für eine gleichmäßige Inertgasverteilung und für die Vermeidung von Strömungsprofilstörungen im Kanal zu treffen.However, since the inert gas purging of the irradiation channel is a metastable aerodynamic system and not only the lowest possible residual oxygen content, but a largely homogeneous inert gas atmosphere is required, except for the retention of atmospheric oxygen in the channel constructive measures for a uniform inert gas and avoidance to meet flow profile disturbances in the channel.

Dazu gibt es bereits eine Reihe von Erfindungen und Entwicklungen, die dem Erkenntnisfortschritt entsprechend sukzessive verbessert wurden, wobei sich aber auch vermeintliche Problemlösungen nicht bewährt haben.There are already a number of inventions and developments that have been successively improved according to the progress of knowledge, but also alleged solutions have not proven successful.

So wurde bereits bei der Einführung der UV-Silikonisierung (s.a. DE 3416502 A1 und EP 0161540 A1 ) zur Abschottung der Inertatmosphäre im Bestrahlungskanal gegen die Kühlluft der unten offenen Quecksilber-Mitteldrucklampe eine UV-transparente Quarzscheibe eingesetzt, die heute noch als effektive Lösung Verwendung findet.Thus, already at the introduction of the UV siliconization (sa DE 3416502 A1 and EP 0161540 A1 ) used for foreclosing the inert atmosphere in the irradiation channel against the cooling air of the bottom open mercury medium pressure lamp, a UV-transparent quartz disc, which is still used today as an effective solution.

Der Versuch eines UV-Iampeninternen Stickstoffkreislaufes unter Einsparung der Quarzscheibe zur Vermeidung eines UV-Transmissionsverlustes erwies sich als nicht tragfähig, weil zu aufwändig und keineswegs inertgassparend ( DE 000019916474 A1 und WO 002000061999 A1 ).The attempt of a UV lamp internal nitrogen cycle with the saving of the quartz disk to avoid a UV transmission loss proved to be unsustainable because too expensive and by no means inert gas saving ( DE 000019916474 A1 and WO 002000061999 A1 ).

Bewährt hat sich dagegen offensichtlich die gleichmäßige Inertgaseinspeisung über die Kanalbreite unter Verwendung von porösen Gasverteilerelementen, vorzugsweise von Sintermetall, mit definiertem Druckverlust, die eine Strahlwirkung vermeiden, unterstützt durch eine Vorverteilungseinheit ( DE 20 2005 021 576 U1 ).
Diese Gasverteilung wird bei 172 nm Excimerstrahlern, die zur Mikrostrukturierung von Acrylatlackoberflächen (physikalische Mattierung durch photochemische Mikrofaltung) eingesetzt werden, in der Lampendecke installiert. Damit wird mit dem kalten Reinststickstoff der Strahler über die gesamte Strahlerlänge gleichmäßig gekühlt, und da die Excimerlampe keine Quarzscheibe erfordert, strömt der Stickstoff aus der unteren Lampenöffnung zur Inertisierung in den Bestrahlungskanal. Vorgeschlagen wird sogar eine automatische Differenzdruckanpassung durch Variation der Wirkfläche des porösen Gasverteilerelementes.On the other hand, evidently the uniform supply of inert gas via the channel width using porous gas distributor elements, preferably of sintered metal, with defined pressure loss, which avoid a jet effect, supported by a pre-distribution unit ( DE 20 2005 021 576 U1 ).
This gas distribution is installed in the lamp ceiling at 172 nm excimer emitters, which are used for microstructuring of acrylate lacquer surfaces (physical matting by photochemical microplating). Thus, the radiator is uniformly cooled over the entire radiator length with the cold pure nitrogen, and since the excimer lamp does not require a quartz disc, the nitrogen flows from the lower lamp opening for inerting in the irradiation channel. It even proposes an automatic differential pressure adjustment by varying the effective area of the porous gas distribution element.

Im Fall einer klassischen UV-Härtung mit einer Quarzscheibe unter der Quecksilber-UV-Mitteldrucklampe wird das Inertgas durch eine sogenannte Volumenbefülldüse, die ebenfalls auf der Basis eines porösen Gasverteilerelementes arbeiten kann, über die gesamte Kanalbreite eingespeist. Produkteinlaufseitig verwendet man zur besseren Rückhaltung des Luftsauerstoffes und zum "Abschälen" des Sauerstoffs von der Lackoberfläche eine sogenannte "Rakel-" oder "Schäldüse". Die darüber eingespeiste Inertgasmenge muss allerdings auf die Durchlaufgeschwindigkeit des Produktes abgestimmt sein - bei veränderbarer Geschwindigkeit am besten geregelt - um eine produktauslaufseitige Lufteinströmung zu vermeiden.In the case of a conventional UV curing with a quartz disk under the mercury UV medium-pressure lamp, the inert gas is fed through a so-called volume filling nozzle, which can also work on the basis of a porous gas distribution element over the entire channel width. On the product inlet side, a so-called "squeegee" or "peeling nozzle" is used for better retention of the atmospheric oxygen and for "peeling off" the oxygen from the surface of the coating. However, the amount of inert gas fed in must be matched to the throughput speed of the product - which is best regulated at a variable speed - in order to avoid a product outflow-side air inflow.

Als produkteinlaufseitige Gasbarriere werden in der Regel eine einfache höhenverstellbare Blende über die gesamte Kanalbreite oder auch ein Labyrinth ( WO 2005 075111 A1 ) verwendet und produktauslaufseitig eine Gummidichtlippe, ein Bürstenelement oder ebenfalls ein Labyrinth für eine berührungsfreie Ausführung, wobei an den Labyrinthen eine Inertgaseinspeisung und Restsauerstoffmessung erfolgen kann ( WO 2005 075111 A1 ).As the product inlet side gas barrier are usually a simple height-adjustable aperture over the entire channel width or even a labyrinth ( WO 2005 075111 A1 ) and product outlet side a rubber sealing lip, a brush element or also a labyrinth for a non-contact execution, wherein the labyrinths an inert gas feed and residual oxygen measurement can take place ( WO 2005 075111 A1 ).

Eine große Bedeutung hat die Restsauerstoffmessung im Inertgas der Bestrahlungszone. Dazu hat sich die Verwendung eines Zirkonoxid-Festelektrolyt-Sensors etabliert, der sich aufgrund seines großen Messbereichs (1 ppm bis > 21 % O2) und seiner kurzen Ansprechzeit sogar zur Inertgasmengenregelung eignet. Zur Messung im Bypassbetrieb wird mittels einer kleinen Gaspumpe über eine Rohrsonde in der Kanaldecke - meist in der Kanalmitte angeordnet - das Gas kontinuierlich durch die Messzelle gesaugt.Of great importance is the residual oxygen measurement in the inert gas of the irradiation zone. For this purpose, the use of a zirconia solid electrolyte sensor has been established, which is due to its large measuring range (1 ppm to> 21% O 2 ) and its short response time even to Inertgasmengenregelung. For measuring in bypass mode, the gas is continuously sucked through the measuring cell by means of a small gas pump via a tube probe in the channel ceiling - usually arranged in the middle of the channel.

Von großem Einfluss auf die Restsauerstoffkonzentration ist auch die Produktart und -form und die damit verbundene Fördertechnik sowie die bestmögliche Anpassung der Ein- und Auslaufgasbarrieren.
Die beste Lösung wird bei Bahnbeschichtung von Rolle zu Rolle mit einer Bahnführung über eine Kühlwalze und darüber angeordneter inertisierter UV-Technik erreicht. Problematischer ist die UV-Härtung einer Plattenbeschichtung unter Inertbedingungen, da jedes Stückgut Luftsauerstoff in Form einer "Bugwelle" in den Bestrahlungskanal einschleppt und auch das Transportsystem dazu einen nicht unerheblichen Beitrag leistet. Hier kommt es vor allem auf die Art der Inertgaseinspeisungsdüsen und deren Anordnung an.Of great influence on the residual oxygen concentration is also the product type and shape and the associated conveyor technology as well as the best possible adaptation of the inlet and outlet gas barriers.
The best solution is achieved in web coating from roll to roll with a web guide via a chill roll and arranged above it inerted UV technology. More problematic is the UV curing of a plate coating under inert conditions, since each piece of air entrained in the form of a "bow wave" in the irradiation channel and also makes the transport system to make a significant contribution. This is mainly due to the nature of the Inertgaseinspeisungsdüsen and their arrangement.

Obwohl die am Markt befindlichen UV-Inertisierungssysteme prinzipiell funktionieren, sind sie doch bezüglich Stabilität des Inertregimes - lateral gleichmäßige Restsauerstoffkonzentration und geringe zeitliche Schwankungen im Durchlauf - sowie hinsichtlich Inertgaskonsum anfällig und unzureichend.Although the UV inerting systems on the market function in principle, they are susceptible and inadequate with respect to the stability of the inert regime - laterally uniform residual oxygen concentration and small variations over time in the passage - as well as inert gas consumption.

Außerdem ist für eine gute Qualität einer UV-Lackbeschichtung nicht nur die Entfernung des Sauerstoffs von der Oberfläche, sondern auch aus der flüssigen oder pastösen Lackschicht wichtig. Im Zusammenhang mit den viskositätsabhängigen Sauerstoffdiffusionskoeffizienten (sa. Fig. 1) und den von der Relativgeschwindigkeit zwischen Lackoberfläche und Inertgas abhängigen Stoffübergangskoeffizienten spielt die Verweilzeit der flüssigen/pastösen UV-Farb- oder -Lackschicht in der sauerstoffarmen Inergasatmosphäre vor dem Erreichen der Bestrahlungszone eine wesentliche Rolle.In addition, for a good quality of a UV lacquer coating not only the removal of the oxygen from the surface, but also from the liquid or pasty lacquer layer is important. In connection with the viscosity-dependent oxygen diffusion coefficients (sa. Fig. 1 ) and the dependent on the relative speed between the paint surface and inert gas mass transfer coefficients, the residence time of the liquid / pasty UV ink or lacquer layer in the oxygen-poor inert gas before reaching the irradiation zone plays an essential role.

Die produkt- und durchlaufgeschwindigkeitsangepasste Inertgasmengeneinspeisung allein löst das Stabilitätsproblem nicht, denn hier gilt nicht "viel hilft viel", da es durch Turbulenzen im Kanal aufgrund lokal unterschiedlicher Gasgeschwindigkeiten zum ein- und auslaufseitigen Einsaugen von Luft kommen kann.The product and throughput-adapted inert gas feed alone does not solve the stability problem, because here "does not help much", since turbulence in the channel due to locally different gas velocities for incoming and outgoing air suction can occur.

Es ist die Erkenntnis als dem Stand der Technik zuzurechnen, dass nur mit einer an das jeweilige Produkt und an das damit verbundene Transportsystem angepassten Gestaltung des Kanals, der Gasbarrieren und der Düsenanzahl und -anordnung und deren Handling eine stabiles Inertisierungsregime und eine optimale Produktqualität erreicht werden kann. Das gilt insbesondere für Prozesse mit hohem Anspruch an das Restsauerstoffniveau und die Homogenität der lateralen Restsauerstoffverteilung, wie die Excimer-VUV-Mattierungstechnologie (O2 < 100 ppm), die Silikonisierung mit Silikonacrylaten (O2 < 50 ppm) und die photoinitiatorfreie UV-Härtung mit VUV/UVC-Photonen (O2 < 10 ppm) ( DE 10 2008 061 244 A1 ).It is the recognition as attributable to the prior art that only with a matched to the particular product and the associated transport system design of the channel, the gas barriers and the number and arrangement of nozzles and their handling a stable inerting regime and optimum product quality can be achieved can. This applies in particular to processes with high residual oxygen content requirements and the homogeneity of the lateral residual oxygen distribution, such as excimer VUV matting technology (O 2 <100 ppm), siliconization with silicone acrylates (O 2 <50 ppm) and photoinitiator-free UV curing with VUV / UVC photons (O 2 <10 ppm) ( DE 10 2008 061 244 A1 ).

Aufgabe der vorliegenden Erfindung ist es daher, eine Vorrichtung zur Inertisierung der Bestrahlungszone vorzuschlagen, mit der bei geringstem Inertgasverbrauch eine stabile und homogene Inertisierung der Bestrahlungszone erreicht wird, so dass UV-Härtung und photochemische Oberflächenstrukturierung unter technisch vorteilhaften Bedingungen erfolgen können.Object of the present invention is therefore to propose a device for inerting the irradiation zone, with the lowest inert gas consumption, a stable and homogeneous inerting of the irradiation zone is achieved, so that UV curing and photochemical surface structuring can be done under technically advantageous conditions.

Wesentliche erfinderische Merkmale sind dabei, dass der Bestrahlungskanal in einer möglichst flachen Ausführung verwendet wird, und somit eine hohe Relativgeschwindigkeit zwischen beschichteter Produktoberfläche und Inertgasstrom entsteht, die aber die Gleichmäßigkeit der Beschichtung nicht beeinträchtigt, um damit eine positive Wirkung auf den O2-Stoffübergangskoeffizienten und eine schnelle Abführung des ausgetauschten Sauerstoffs zu erreichen und gleichzeitig für eine gerichtete Inertgasströmung zu sorgen, wodurch vertikale und horizontale Turbulenzen, die zu Lufteinströmung führen können, weitgehend ausgeschlossen werden.Essential inventive features are that the irradiation channel is used in a flat as possible embodiment, and thus a high relative velocity between the coated product surface and inert gas is formed, but does not affect the uniformity of the coating, so as to have a positive effect on the O 2 -Stoffübergangskoeffizienten and to achieve a rapid removal of the exchanged oxygen and at the same time to provide a directed inert gas flow, whereby vertical and horizontal turbulence, which can lead to air inflow, are largely excluded.

Des Weiteren weist die erfindungsgemäße Vorrichtung eine inertisierte Einlaufstrecke vor der UV-Lampe mit einer solchen Länge auf, dass für die Sauerstoffentfernung von und aus der Beschichtung die erforderliche Verweilzeit in der Inertgasatmosphäre zur Verfügung steht, wobei sich eine solche Vorlaufzone auch positiv auf das Strömungsprofil und damit auf die Gleichmäßigkeit der Restsauerstoffverteilung auswirkt.Furthermore, the device according to the invention has an inerted inlet section in front of the UV lamp with such a length that the required residence time in the inert gas atmosphere is available for removing oxygen from and from the coating, whereby such a flow zone also has a positive effect on the flow profile and thus affecting the uniformity of the residual oxygen distribution.

Gemäß des Erfindungsgedankens ist die produktein- und -auslaufseitige Spalteinstellung widerstandsmäßig dergestalt abgestimmt, dass auslaufseitig die größere Gasbarriere entsteht und somit das Inertgas im Gegenstrom zur Produktförderrichtung produkteinlaufseitig austreten muss. Das bedeutet, dass produkteinlaufseitig ein Labyrinth, wie in WO 2005 075111 A1 vorgeschlagen, nicht zweckmäßig ist. Außerdem ergibt sich bezüglich der Einstellung des Restsauerstoffniveaus und des Inertgasbedarfs eine geschwindigkeitsabhängige Spalthöhe der Einlaufblende, was eine geschwindigkeitsabhängige Regelung der Spalthöhe analog der Inertgasmenge über die Restsauerstoffmessung empfiehlt.According to the inventive concept, the product inlet and outlet side gap adjustment is matched in terms of resistance so that the outlet side, the larger gas barrier arises and thus the inert gas in countercurrent to the product conveying direction must emerge on the product side. This means that the product inlet side is a labyrinth, as in WO 2005 075111 A1 suggested, is not appropriate. In addition, with respect to the adjustment of the residual oxygen level and the Inertgasbedarfs results in a speed-dependent gap height of the inlet aperture, which recommends a speed-dependent control of the gap height analogous to the inert gas via the residual oxygen measurement.

Die erfindungsgemäße Vorrichtung weist eine diffusorartig abgeschrägte Einlaufblende auf, mittels welcher Abreißturbulenzen und Todzonen reduziert werden,
Weiterhin weist die Vorrichtung eine Segmentierung der Einlaufblende und der Auslaufbarriere (Dichtlippe oder Labyrinth) auf, um durch Anpassung an die Produktbreite seitliche Zonen geringeren Widerstandes als über der Produktoberfläche auszuschließen und damit einer negative Beeinflussung der Gasströmung im Kanal und Lufteinsaugerscheinungen entgegen zu wirken.The device according to the invention has a diffuser-like beveled inlet aperture, by means of which tear-off turbulences and dead zones are reduced,
Furthermore, the device has a segmentation of the inlet aperture and the outlet barrier (sealing lip or labyrinth) in order to exclude lateral zones of lower resistance than on the product surface by adaptation to the product width and thus to counteract a negative influence on the gas flow in the channel and Lufteinsaugerscheinungen.

Die Spaltseite der Einlaufblendensegmente einer Bahnanlage ist mit einem weichen Dichtmaterial wie zum Beispiel Filz oder einer speziellen geschlossenporigen Gummilippe ausgestattet, um eine bessere Abdichtwirkung auf einer Kühlwalze zu erhalten, aber bei seitlichem Verlaufen der Bahn einen Bahnriss durch das Segment zu vermeiden.The nip side of the runner segments of a web equipment is provided with a soft sealing material such as felt or a special closed pored rubber lip to provide a better sealing effect on a chill roll, but to avoid web breakage through the segment when the web is running sideways.

Ein weiteres Merkmal zum Lösen der Aufgabe besteht in der Wahl eines geeigneten Transportsystems für Stückgutdurchlaufanlagen und eine darauf abgestimmte wirksame Anzahl und Anordnung der Inertgaseinspeisungsdüsen. Wird z.B. für flache Bleche ein geschlossenes Transportband gewählt, dann sollte das Band eine möglichst geringe Oberflächenrauheit besitzen. Für dickere Platten, die eine relativ große Luftmenge einschleppen können, empfiehlt sich, bei in der Regel geringeren Fördergeschwindigkeiten als 20 m/min, eine Rollenbahn oder ein Stab- oder Netzband und eine Unterflurdüse im Einlaufbereich einzusetzen.Another feature to solve the problem is the choice of a suitable transport system for cargo handling equipment and a coordinated effective number and arrangement of the inert gas feed nozzles. If e.g. For flat sheets, a closed conveyor belt is selected, then the tape should have the lowest possible surface roughness. For thicker plates, which can entrain a relatively large amount of air, it is recommended to use a roller conveyor or a rod or mesh belt and a bottom nozzle in the inlet region at generally lower conveyor speeds than 20 m / min.

Nachfolgend soll die erfindungsgemäße Vorrichtung anhand der Abbildungen näher erläutert werden.Below, the device according to the invention will be explained in more detail with reference to the figures.

Dabei zeigen:

  • Fig. 2 schematisch den seitlichen Schnitt durch einen inertisierten flachen Bestrahlungskanal für die Kombination von Excimer-VUV-Mattierung und UV-Härtung beschichteter Platten mit langer Vorlaufzone (1), perforiertem Transportband (2), abgeschrägter Einlaufblende (3), Beschleierungsdüse (4), Unterflurdüse (5), Volumenbefülldüse (6), Excimerlampe mit Stickstoffeinspeisung (7) durch die Lampendecke, Quecksilber-UV-Mitteldrucklampe (8) mit Quarzscheibe oder UV-LED-Einheit (9), Restsauerstoffmesssonde mit Sensor (10) und auslaufseitiger Dichtlippe (11),
  • Fig. 3 schematisch die Vorderansicht der Produkteinlaufseite mit segmentierter Einlaufblende (12) der Plattenanlage,
  • Fig. 4 schematisch den seitlichen Schnitt durch eine Inertisierung für die UV-Härtung beschichteter Bahnware (13) in Anordnung um eine Kühlwalze (14) mit abgeschrägter verstellbarer Einlaufblende (3), Beschleierungsdüse (4), Volumenbefülldüse (6), Quecksilber-UV-Mitteldrucklampe (8) mit Quarzscheibe oder alternativ UV-LED-Einheit, Restsauerstoffmesssonde mit Sensor (10) und auslaufseitigem Labyrinth (15),
  • Fig. 5 schematisch die Vorderansicht der Produkteinlaufseite mit segmentierter Einlaufblende der Bahnanlage (16).
Showing:
  • Fig. 2 schematically the lateral section through an inertized flat irradiation channel for the combination of excimer VUV matting and UV curing coated plates with long feed zone (1), perforated conveyor belt (2), beveled inlet screen (3), Beschleierungsdüse (4), underfloor nozzle ( 5), volume filling nozzle (6), excimer lamp with nitrogen feed (7) through the lamp ceiling, mercury UV medium pressure lamp (8) with quartz disk or UV LED unit (9), residual oxygen probe with sensor (10) and outlet side sealing lip (11) .
  • Fig. 3 schematically the front view of the product inlet side with segmented inlet aperture (12) of the plate installation,
  • Fig. 4 schematically the lateral section through an inerting for the UV-curing of coated web (13) arranged around a cooling roller (14) with beveled adjustable inlet aperture (3), Beschleierungsdüse (4), Volumenbefülldüse (6), mercury UV medium pressure lamp (8 ) with quartz disk or alternatively UV-LED unit, residual oxygen measuring probe with sensor (10) and outlet-side labyrinth (15),
  • Fig. 5 schematically the front view of the product inlet side with segmented inlet aperture of the railway system (16).

Die Wirkung und Vorteile der Elemente der erfindungsgemäßen Vorrichtung soll anhand von prozesstechnischen Beispielen verdeutlicht werden.The effect and advantages of the elements of the device according to the invention will be clarified by means of process engineering examples.

Beispiel 1:Example 1:

Eine Inertisierungsvorrichtung gemäß Fig. 2 wird zur reinen UV-Lackhärtung auf einer Folienbahn mit nur einer Quecksilber-Mitteldrucklampe einer spezifischen elektrischen Leistung von 200 W/cm verwendet. Die lichte Kanalhöhe beträgt 10 mm und die lichte Kanalbreite 600 mm. Die 500 mm breite Bahn durchläuft die Vorrichtung mit 100 m/min. Bei einer Einlaufspalthöhe von 1 mm und einer Spalthöhe eines auslaufseitig verwendeten Labyrinths von 1 mm werden bei einem Stickstofffluss von 9 Nm3/h 300 ppm Restsauerstoffgehalt registriert. Die Beschichtung mit einem UV-Lack auf Urethanacrylatbasis mittlerer Viskosität, dessen Härtungskinetik bei 200 ppm aus Fig. 6 ersichtlich ist, hat eine Dicke von ca. 10 µm. Nach Fig. 1 wäre für eine Sauerstoffentfernung aus der Schicht bei einem Sauerstoffpartialdruck gegen 5 ppm im Inertgas eine Mindestverweilzeit von 250 ms erforderlich.An inerting device according to Fig. 2 is used for pure UV coating curing on a film web with only one medium pressure mercury lamp of a specific electrical power of 200 W / cm. The clear channel height is 10 mm and the clear channel width is 600 mm. The 500 mm wide web passes through the device at 100 m / min. With an inlet gap height of 1 mm and a gap height of a labyrinth of 1 mm used on the outlet side, 300 ppm residual oxygen content is registered at a nitrogen flow of 9 Nm 3 / h. The coating with a UV lacquer based on urethane acrylate medium viscosity, its curing kinetics at 200 ppm Fig. 6 can be seen, has a thickness of about 10 microns. To Fig. 1 For oxygen removal from the layer at a partial oxygen pressure of 5 ppm in the inert gas, a minimum residence time of 250 ms would be required.

Es wurde nun zunächst eine Inertkanallänge von 300 mm zwischen Einlaufblende und UV-Lampe realisiert. Bei einer Verweilzeit von 180 ms unter 300 ppm O2 und einer UV-Dosis von 125 mJ/cm2 wird, wie nach der Kinetik in Fig. 6 zu erwarten, nur ein C=C-Doppelbindungsumsatz von 41 % mittels Infrarotspektroskopie (ATR) ermittelt. Anwendungstechnisch drückt sich das in einer schlechten Mikrohärte von nur 165 N/mm2 und einem Glanzgrad (60°-Geometrie) von 67 GP (Glanzpunkten) aus.At first, an inert channel length of 300 mm was realized between the inlet aperture and the UV lamp. At a residence time of 180 ms under 300 ppm O 2 and a UV dose of 125 mJ / cm 2 , as in the kinetics in Fig. 6 to be expected, only a C = C double bond conversion of 41% determined by infrared spectroscopy (ATR). In terms of application, this is expressed in a poor microhardness of only 165 N / mm 2 and a gloss level (60 ° geometry) of 67 GP (highlights).

Eine Einlaufkanalverlängerung auf 1500 mm führte bei gleichem Stickstofffluss und einer Reduzierung des Restsauerstoffgehaltes auf 200 ppm mit einer Verweilzeit von 900 ms zu einer ganz deutlichen Eigenschaftsverbesserung. Wie nach der Härtungskinetik in Fig. 6 bei 200 ppm O2 und 900 ms Verweilzeit zu erwarten, konnte nach einer Härtung mit 125 mJ/cm2 ein C=C-Doppelbindungsumsatz von 86 % mittels Infrarotspektroskopie (ATR) nachgewiesen werde. Dementsprechend konnten eine Mikrohärte von 212 N/mm2 und ein Glanzgrad von 84 GP (Glanzpunkten) gemessen werden.An inlet channel extension to 1500 mm resulted in a very significant improvement in the characteristics of the same nitrogen flow and a reduction of the residual oxygen content to 200 ppm with a residence time of 900 ms. As according to the curing kinetics in Fig. 6 to be expected at 200 ppm O 2 and 900 ms residence time, a C = C double bond conversion of 86% was detected by means of infrared spectroscopy (ATR) after curing with 125 mJ / cm 2 . Accordingly, a microhardness of 212 N / mm 2 and a gloss level of 84 GP (highlights) could be measured.

Beispiel 2:Example 2:

Anhand einer UV-Härtung beschichteter Bahnware über einer Kühlwalze gemäß Fig. 4 wird der Einfluss der Einlaufspalthöhe demonstriert.On the basis of UV curing of coated webs over a chill roll in accordance with Fig. 4 the influence of the inlet gap height is demonstrated.

Aus Fig. 7 wird deutlich, dass überraschenderweise zunächst mit zunehmender Bahngeschwindigkeit der Stickstoffbedarf zum Erreichen von 50 ppm Restsauerstoff in der Bestrahlungszone mit Erhöhung des Einlaufspaltes sinkt, wobei es aber ein Optimum in der Einstellung von Einlaufspalt und Stickstofffluss für jede Bahngeschwindigkeit gibt.Out Fig. 7 It is clear that, surprisingly, initially with increasing web speed, the nitrogen requirement for achieving 50 ppm of residual oxygen in the irradiation zone decreases with an increase in the inlet gap, but there is an optimum in the setting of inlet gap and nitrogen flow for each web speed.

Beispiel 3:Example 3:

Eine Anlage gemäß Fig. 2 wird zur physikalischen Mattierung von mit UV-Lack beschichteten MDF-Platten mittels 172 nm Excimerphotonen und anschließender Durchhärtung mit langwelligem UV-Licht einer 160 W/cm Quecksilber-Mitteldrucklampe verwendet. Die lichte Inertkanalhöhe beträgt 30 mm und die lichte Kanalbreite 1400 mm. Die Platten mit Abmessungen (LxBxH) 2000x1200x22 werden mit einer Geschwindigkeit von 10 m/min auf einem Metallgitterband durch die VUV/UV-Anlage bewegt.An attachment according to Fig. 2 is used for the physical matting of UV varnish-coated MDF sheets by means of 172 nm excimer photons and subsequent curing with long-wave UV light of a 160 W / cm medium pressure mercury lamp. The clear Inertkanalhöhe is 30 mm and the clear channel width 1400 mm. The plates with dimensions (LxWxH) 2000x1200x22 are moved at a speed of 10 m / min on a metal mesh belt through the VUV / UV system.

Die Mikrostrukturierung der Lackoberfläche durch photochemische Mikrofaltung reagiert sehr empfindlich auf einen inhomogenen Restsauerstoffgehalt in der Bestrahlungszone, da die 172 nm Photonen unter Ozonbildung vom Sauerstoff absorbiert werden und in den Problemzonen eine VUV-Dosisminderung eintritt, die zur Strukturbeeinflussung und damit zu sichtbaren lokalen Glanzunterschieden führt.Microstructuring of the lacquer surface by photochemical microfilling is very sensitive to an inhomogeneous residual oxygen content in the irradiation zone, since the 172 nm photons are absorbed by oxygen under ozone formation and in the problem areas a VUV dose reduction occurs, which leads to structural influence and thus to visible local gloss differences.

Der Stückguttransport wird immer durch eine sogenannte "Bugwelle" an Sauerstoff vor dem Produkt begleitet, die jedes Mal einen kurzzeitigen Anstieg der Sauerstoffkonzentration und bei zu hohen Spitzenwerten Strukturstörungen hervorruft.The transport of unit loads is always accompanied by a so-called "bow wave" of oxygen in front of the product, which causes each time a short-term increase in the oxygen concentration and at too high peaks structural disturbances.

Der Inertisierungsstickstoff wird über die Excimerlampe (7), eine Beschleierungsdüse (4) und wahlweise eine Unterflurdüse (5) eingespeist. Dazu werden die Wirkung einer unterschiedlich langen Einlaufzone und der Einlaufspalteinstellung gemäß Fig. 3 demonstriert. Auslaufseitig bildet eine Dichtlippe die Stickstoffbarriere. Die Sauerstoffmessstelle befindet sich kurz vor der Excimerlampe.The inertizing nitrogen is fed in via the excimer lamp (7), a fogging nozzle (4) and optionally an underfloor nozzle (5). For this purpose, the effect of a different length inlet zone and the inlet gap setting according to Fig. 3 demonstrated. On the outlet side, a sealing lip forms the nitrogen barrier. The oxygen measuring point is located shortly before the excimer lamp.

Die Parametervariation ist der Tabelle 1 zu entnehmen und die Wirkung auf den Restsauerstoffanstieg und den wellenförmigen Verlauf ist in Fig. 8 dargestellt.The parameter variation is shown in Table 1 and the effect on the residual oxygen increase and the undulating course is in Fig. 8 shown.

Daraus ist ersichtlich, dass eine verlängerte Einlaufzone ebenso wie ein Absenken der seitlichen diffusorartig abgeschrägten Segmente der Einlaufblende gemäß Fig. 3 einen niedrigeren Restsauerstoffwert und eine bessere Gleichverteilung über den Kanalquerschnitt führen. Der durch die "Bugwelle" verursachte Schwellwert wird durch den Einsatz der Unterflurdüse deutlich verringert.It can be seen that a prolonged inlet zone as well as a lowering of the lateral diffuser-like beveled segments of the inlet aperture according to Fig. 3 lead to a lower residual oxygen value and a better uniform distribution over the channel cross-section. The threshold caused by the "bow wave" is significantly reduced by the use of the underfloor nozzle.

Claims (14)

  1. A device for the inertization of the radiation zone in the event of UV interlinking and the photochemical surface structuring of acrylate- and methacrylate-based coatings on sheet- or panel-shaped substrates, in particular presenting high re-quirements on a minor residual oxygen level, which is uniformly distributed in the lateral direction, in each case of application less than 100ppm, 50ppm and 10ppm, located in a radiation channel to be filled with inert gas, preferably high-purity nitrogen, which consists of a radiation channel for UV curing or for a combination of excimer VUV de-lustering and UV curing, comprising a waiting zone (1), conveyor (2) or sheet material (13), feed orifice (3), misting nozzle (4), volume filling nozzle (6), excimer lamp including nitrogen feeder (7) through the lamp ceiling, medium pressure mercury UV lamp (8) including a quartz disk or UV LED unit (9), a residual oxygen measuring gauge with a sensor (10), and in case of panel-shaped substrates with an exit-section gas barrier, executed as a sealing lip or brush or the like (11) or in case of radiation of coated sheet materials executed as a labyrinth (15), characterized in that
    in order to achieve a high relative velocity between the product surface (13) and the directional inert gas flow without affection of the liquid coating and to prevent the formation of turbulences and ensure that the oxygen is removed from the coating as well (Fig. 1), the flat design of the radiation channel (1) in continuous systems is designed in such a way above the coated product surface (13) that the channel height level can be adjusted in relation to the product height and consistency of the coating, and that the feed orifice (3) and the exit-section gas barrier (11 or 15) are made of segments which can be height-adjusted (12 or 16).
  2. A device in accordance with Claim 1, characterized in that the conveyor (2) is a band conveyor or a roller conveyor if the device is in the form of a continuous system for general cargo.
  3. A device in accordance with Claim 2, characterized in that the band conveyor has a perforated design.
  4. A device in accordance with Claim 2 or 3, characterized in that the waiting zone (1) is provided with a nozzle under floor level (5) if the device is in the form of a continuous system for general cargo.
  5. A device in accordance with Claim 1, characterized in that the waiting zone (1) required for inertization has a design which ensures that the incoming stock re-mains inside for a specified period of time, which is 1 s for continuous systems for general cargo and 0.3 s for sheet systems.
  6. A device in accordance with Claim 1, characterized in that all nozzles (4, 5, 6 and 7) are equipped with porous or perforated diffusor elements of a defined differen-tial pressure and a per-diffusion chamber to distribute the gas uniformly.
  7. A device In accordance with Claim 1 and 6, characterized in that the misting noz-zle (4) is arranged so that its action is directed at an angle of 25° to 60° against the sheet run direction.
  8. A device in accordance with Claim 1, characterized in that the segments forming the feed orifice (3) are tapered off in the form of diffusors in the direction of the gas flow and against the product run.
  9. A device in accordance with Claim 1 and 8, characterized in that the feed orifice (3) formed by height-adjustable segments (12) can be adjusted to the product width by means of another height-adjustment system used to move the segments.
  10. A device in accordance with Claim 1, characterized in that the height level of the feed slot is controlled depending on the speed and inert gas yield to be adjusted to the content of residual oxygen, by means of the feed orifice (3) which is com-posed of the height-adjustable segments (12).
  11. A device in accordance with Claim 1, characterized in that the exit barrier (11 or 15) composed of the height-adjustable segments (12) can be adjusted to the product width by means of another height-adjustment system used to move the segments.
  12. A device in accordance with the above Claims, characterized in that in the event of sheet systems existing, the radiation channel is arranged both for pure UV curing with a medium pressure mercury UV lamp or a LED unit both for excimer VUV de-lustering in a combination of excimer lamp and medium pressure mercury UV lamp or a LED unit around a cylindrical roll (14), preferably a cooling roll, while the roll surface established the channel base and therefore the counter-panel underneath the UV lamps, and the channel is sealed off against the roll (14) with dynamic sealing.
  13. A device in accordance with Claim 12, characterized in that the undersides of the feed orifice segments are coated with a soft.
  14. A device in accordance with Claim 13, characterized in that the sealing material is made of felt or a lip made of special closed cell rubber.
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WO2023222178A1 (en) 2022-05-19 2023-11-23 IOT - Innovative Oberflächentechnologien GmbH Irradiation device with excimer emitters as uv source

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ES2650472T3 (en) 2018-01-18
PL2786807T3 (en) 2018-03-30
EP2786807A1 (en) 2014-10-08
DE102013005741B3 (en) 2014-05-22

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