EP2765000A1 - Hardening of wood imitation coating arranged on a substrate - Google Patents
Hardening of wood imitation coating arranged on a substrate Download PDFInfo
- Publication number
- EP2765000A1 EP2765000A1 EP13154872.9A EP13154872A EP2765000A1 EP 2765000 A1 EP2765000 A1 EP 2765000A1 EP 13154872 A EP13154872 A EP 13154872A EP 2765000 A1 EP2765000 A1 EP 2765000A1
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- European Patent Office
- Prior art keywords
- substrate
- leds
- photoinitiator
- led array
- coating
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- 239000000758 substrate Substances 0.000 title claims abstract description 52
- 238000000576 coating method Methods 0.000 title claims abstract description 33
- 239000011248 coating agent Substances 0.000 title claims abstract description 31
- 239000002023 wood Substances 0.000 title description 3
- 238000000862 absorption spectrum Methods 0.000 claims abstract description 5
- 230000005855 radiation Effects 0.000 claims description 21
- 241000931526 Acer campestre Species 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 17
- 238000007639 printing Methods 0.000 claims description 11
- 230000001678 irradiating effect Effects 0.000 claims 1
- 239000000976 ink Substances 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 238000003491 array Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007646 gravure printing Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
Images
Classifications
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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
- B05D3/06—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
- B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
- B41F23/044—Drying sheets, e.g. between two printing stations
- B41F23/045—Drying sheets, e.g. between two printing stations by radiation
- B41F23/0453—Drying sheets, e.g. between two printing stations by radiation by ultraviolet dryers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams
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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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
- B05D5/061—Special surface effect
Definitions
- the invention relates to a method for curing a arranged on a substrate Maserdruckbe Anlagenung and / or a UV topcoat, which have at least one photoinitiator, wherein the coated with the Masertikbe Anlagenung and / or the UV topcoat substrate with the radiation of a UV light source, in particular with wavelengths between 300 nm and 420 nm, wherein the UV light source has at least one wavelength in the range of the absorption spectrum of the photoinitiator.
- maser printing makes it possible, for example, plates, strips or profiles and the like.
- a surface structure that is modeled, for example, the surface of natural wood or natural stones.
- the substrates are printed by means of indirect gravure printing (offset method) with a decor which consists of paint or ink and cures upon irradiation with UV light.
- colorless UV matt or UV gloss lacquers can subsequently be applied as a surface coating.
- PVC sheets can be produced, which can be used as wall coverings or baseboards.
- conventional UV lamps have hitherto been used for curing the paint or ink composition. These conventional UV lamps emit radiation with wavelengths between about 320 microns to 420 microns.
- the paints and / or inks used for the maser printing coating have correspondingly a plurality of photoinitiators, wherein each photoinitiator absorbs light of a specific wavelength or of a specific wavelength spectrum.
- each photoinitiator absorbs light of a specific wavelength or of a specific wavelength spectrum.
- the wavelength spectrum of a conventional UV lamp are covered, so that it is ensured that regardless of the UV lamps used by the user, a complete curing of the coating used can be achieved.
- the aforementioned UV lamps also emit heat radiation, which can heat the coated substrate and thus damage.
- the number of UV lamps used is limited, which in turn reduces the speed of production.
- the UV lamps used in the prior art are mostly doped or undoped high-pressure mercury lamps, which require a certain lead time and also a certain follow-up time, which also increases the time required for production. In addition, they have a relatively short life and a loss of performance in the course of the same.
- the document describes US 2005/0062830 a device having LED arrays formed widthwise in accordance with the width of heat-sensitive recording paper.
- the individual LEDs within the array are arranged and aligned so that the light emitted by them is distributed evenly in the width direction of the recording paper and thus unevenness is avoided.
- the size of the LED array is exactly matched to the width of the recording paper.
- a reflector used in conjunction with the LEDs also provides directional irradiation of the recording paper.
- the pamphlets EP 2 390 102 and WO 2007/096824 also relate to arrangements of UV LEDs which are used to cure photoinitiator-coated coatings. These arrangements specifically focus the light of the UV LEDs with the aid of reflectors and lenses onto a specific location of the coated substrate.
- the invention provides that an array of UV LEDs is used to irradiate the maser pressure coating as a UV light source.
- UV LEDs to cure the maser print coating has the advantage that they emit monochromatic radiation, so that the emission of heat radiation is prevented.
- any number of UV LEDs can be used without thereby increasing the heat radiation. Damage to the substrate is reliably prevented.
- LEDs also have the advantage that they do not require any lead times and / or follow-up times, so that a total of faster curing of the coating is possible.
- LEDs have about ten times longer life than conventional gas powered UV lamps, so maintenance can be minimized. A loss of power during the life of the UV LEDs also does not occur. Also, the failure of only single LEDs within the LED array does not affect the homogeneous and complete cure of the coating.
- UV LEDs have a lower power consumption with the same power.
- UV LEDs contain no toxic mercury and there is no toxic ozone gas, since the wavelength of the UV LEDs is always greater than 280 nm.
- semiconductor LEDs in the monochromatic wavelength range of 365 nm, 375 nm, 385 nm, 395 nm and 405 nm on the market. However, wavelengths in the range from 280 nm to 360 nm will also be available in the future.
- the photoinitiator of the maser pressure coating can be adapted to the type of LED used.
- the composition of the Maserdruckbe Anlagenung can be simplified, so that a cost reduction is achieved in that are not provided for all wavelengths of light corresponding photoinitiators.
- applied to the substrate maser pressure coating may have a plurality of photoinitiators, so that substantially for each emitted wavelength, a photoinitiator is provided with a corresponding absorption maximum. It is recommended, for example, to combine UV LEDs with wavelengths of 365 nm, 395 nm and 405 nm.
- the UV LEDs or UV LED packs projecting beyond the substrate in the edge region of the UV LED array are switched off.
- the width of the LED array can be specifically adapted to the width of the substrate coated with the maser printing coating.
- a UV LED array of predetermined width can be provided, which has a multiplicity of UV LEDs arranged in series one after the other and next to one another.
- a corresponding number of LED columns are activated. Unnecessary LED columns remain switched off.
- the LEDs actually required for a curing process can be activated or deactivated depending on the respective substrate. This results not least in a lower energy consumption.
- the outlet openings of the UV LEDs are aligned substantially perpendicular to the surface of the substrate, so that the emitted radiation impinges on direct beam paths to the substrate. According to this arrangement, it becomes possible to directly and homogeneously irradiate the crayon printing coat with UV light, so that the coating applied to the substrate can be uniformly cured. Since the invention thus also requires no reflectors and / or lenses for aligning and focusing the radiation, the individual UV LEDs can be brought closer to the maser pressure coating to be irradiated.
- the UV LEDs are arranged at a distance of a few millimeters to the surface of the substrate. As a result, the required installation space can be reduced overall, so that even a multiplicity of UV LEDs or even UV LED arrays can be arranged next to one another to save space.
- the invention also expressly specifically protects the use of a UV LED array for curing a maser printing coating arranged on a substrate, the maser printing coating having at least one photoinitiator, and wherein the UV LED array comprises a plurality of UV LEDs or UV LED packages whose emitted radiation has at least one wavelength in the range of the absorption spectrum of the photoinitiator.
- the substrate 3 is coated with the maser printing coating 4, which may comprise a paint or an ink.
- This coating 4 has one or more photoinitiators at the same time, which can be activated with light radiation of one (or even more) specific wavelengths in order to harden the coating 4.
- the substrate 3 is irradiated with the radiation of a UV LED array 1.
- the UV LED array 1 in this case has grid-like arranged UV LEDs 2, which are aligned in columns and rows. Depending on the width of the coated substrate 3, UV LEDs 2 projecting beyond the substrate 3 are switched off in the edge region of the UV LED array 1, so that only those UV LEDs 2 are switched on which are located directly over the surface of the substrate 3 ,
- the substrate 3 or the maser pressure coating 4 arranged thereon is then irradiated with the UV radiation emitted by the UV LEDs 2.
- the UV LEDs 2 emit radiation of one (or more) wavelengths.
- the photoinitiator corresponding to the respective radiation wavelength absorbs the respective radiation fraction and thereby initiates the curing of the coating 4.
- the substrate 3 may advantageously also be pulled continuously over or under the UV LED array 1, as on an assembly line. The cured product is then ready for use.
- the invention thus provides a particularly space-saving and cost-effective solution for hardening a maser pressure coating 4 applied to a substrate 3.
- the coated substrate 3 is irradiated directly, ie without the detour via reflectors or lenses, with the radiation of the UV LEDs 2. This eliminates existing problems in the prior art due to contamination of the reflectors, misalignment of the reflectors or an increased structural dimension of the entire device.
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Härtung einer auf einem Substrat angeordneten Maserdruckbeschichtung und/oder eines UV-Decklackes, welche mindestens einen Fotoinitiator aufweisen, wobei das mit der Maserdruckbeschichtung und/oder dem UV-Decklack beschichtete Substrat mit der Strahlung einer UV-Lichtquelle, insbesondere mit Wellenlängen zwischen 300 nm und 420 nm, bestrahlt wird, wobei die UV-Lichtquelle mindestens eine Wellenlänge im Bereich des Absorptionsspektrums des Fotoinitiators aufweist.The invention relates to a method for curing a arranged on a substrate Maserdruckbeschichtung and / or a UV topcoat, which have at least one photoinitiator, wherein the coated with the Maserdruckbeschichtung and / or the UV topcoat substrate with the radiation of a UV light source, in particular with wavelengths between 300 nm and 420 nm, wherein the UV light source has at least one wavelength in the range of the absorption spectrum of the photoinitiator.
Die Technik des sogenannten Maserdruckes gestattet es, beispielsweise Platten, Leisten oder Profilen und dgl. eine Oberflächenstruktur zu verleihen, die beispielsweise der Oberfläche von natürlichem Holz oder auch Natursteinen nachgebildet ist. Dabei werden die Substrate mittels indirektem Tiefdruck (Offset-Verfahren) mit einem Dekor bedruckt, welches aus Lack oder Tinte besteht und bei Bestrahlung mit UV-Licht aushärtet. Zur Veredelung können anschließend noch farblose UV-Matt- oder UV-Glanzlacke als Oberflächenbeschichtung aufgetragen werden. Dadurch können beispielsweise PVC-Platten hergestellt werden, die als Wandverkleidungen oder auch Fußleisten genutzt werden können. Im Stand der Technik kommen zur Aushärtung der Lack- oder Tintenzusammensetzung bisher herkömmliche UV-Lampen zum Einsatz. Diese herkömmlichen UV-Lampen emittieren Strahlung mit Wellenlängen zwischen ca. 320 µm bis 420 µm. Die für die Maserdruckbeschichtung verwendeten Lacke und/oder Tinten weisen dazu korrespondierend eine Mehrzahl von Fotoinitiatoren auf, wobei ein jeder Fotoinitiator Licht einer bestimmten Wellenlänge bzw. eines bestimmten Wellenlängenspektrums absorbiert. In Kombination der eingesetzten Fotoinitiatoren kann somit das Wellenlängenspektrum einer herkömmlichen UV-Lampe abgedeckt werden, so dass sichergestellt ist, dass unabhängig von den vom Verwender eingesetzten UV-Lampen eine vollständige Aushärtung der eingesetzten Beschichtung erzielt werden kann.The technique of so-called maser printing makes it possible, for example, plates, strips or profiles and the like. To give a surface structure that is modeled, for example, the surface of natural wood or natural stones. The substrates are printed by means of indirect gravure printing (offset method) with a decor which consists of paint or ink and cures upon irradiation with UV light. For finishing, colorless UV matt or UV gloss lacquers can subsequently be applied as a surface coating. As a result, for example, PVC sheets can be produced, which can be used as wall coverings or baseboards. In the prior art conventional UV lamps have hitherto been used for curing the paint or ink composition. These conventional UV lamps emit radiation with wavelengths between about 320 microns to 420 microns. The paints and / or inks used for the maser printing coating have correspondingly a plurality of photoinitiators, wherein each photoinitiator absorbs light of a specific wavelength or of a specific wavelength spectrum. In combination of the used photoinitiators can Thus, the wavelength spectrum of a conventional UV lamp are covered, so that it is ensured that regardless of the UV lamps used by the user, a complete curing of the coating used can be achieved.
Die vorgenannten UV-Lampen emittieren jedoch ebenso Wärmestrahlung, welche das beschichtete Substrat erwärmen und somit schädigen können. Dadurch ist in der Praxis die Anzahl der zum Einsatz kommenden UV-Lampen beschränkt, was wiederum die Geschwindigkeit der Produktion reduziert. Darüber hinaus sind die im Stand der Technik verwendeten UV-Lampen zumeist dotierte oder undotierte Quecksilber-Hochdruckstrahler, welche eine gewisse Vorlauf- und auch eine gewisse Nachlaufzeit benötigen, was ebenfalls die für die Produktion erforderliche Zeit erhöht. Darüber hinaus weisen diese eine relativ kurze Lebensdauer sowie einen Leistungsverlust im Laufe derselben auf.However, the aforementioned UV lamps also emit heat radiation, which can heat the coated substrate and thus damage. As a result, in practice, the number of UV lamps used is limited, which in turn reduces the speed of production. In addition, the UV lamps used in the prior art are mostly doped or undoped high-pressure mercury lamps, which require a certain lead time and also a certain follow-up time, which also increases the time required for production. In addition, they have a relatively short life and a loss of performance in the course of the same.
Daneben existieren im Stand der Technik Verfahren zur Aushärtung von Fotoinitiatoren aufweisenden Beschichtungen, welche beispielsweise zur Beschichtung von thermosensitivem Papier oder auch als Verbindungsmaterialien in der Zahntechnik, Chirurgie usw. eingesetzt werden.In addition, in the prior art, there are processes for curing coatings containing photoinitiators, which are used, for example, for coating thermosensitive paper or else as connecting materials in dental technology, surgery and the like.
Diesbezüglich beschreibt beispielsweise die Druckschrift
Die Druckschriften
Es ist ausgehend vom vorgenannten Stand der Technik Aufgabe der vorliegenden Erfindung, ein Verfahren zur Härtung einer auf einem Substrat angeordnetenIt is based on the aforementioned prior art object of the present invention, a method for curing a arranged on a substrate
Maserdruckbeschichtung zu schaffen, welches die vorgenannten Probleme in Bezug auf die hohe Störanfälligkeit und geringe Lebensdauer herkömmlicher UV-Lampen vermeidet, und zudem eine leichte und kostengünstige Variation der Beleuchtungsstärke während des Härtungsprozesses ermöglicht und insbesondere die Beleuchtung unkompliziert an unterschiedlich große Substrate anpasst.To provide Maserdruckbeschichtung, which avoids the above problems in terms of high susceptibility and low life of conventional UV lamps, and also allows easy and cost-effective variation of the illuminance during the curing process and in particular the lighting easily adapts to different sized substrates.
Zur Lösung der vorgenannten Aufgabe sieht die Erfindung vor, dass zur Bestrahlung der Maserdruckbeschichtung als UV-Lichtquelle ein Array von UV-LEDs eingesetzt wird.To achieve the above object, the invention provides that an array of UV LEDs is used to irradiate the maser pressure coating as a UV light source.
Die Verwendung von UV-LEDs zur Härtung der Maserdruckbeschichtung weist den Vorteil auf, dass diese monochromatische Strahlung emittieren, so dass die Emission von Wärmestrahlung verhindert wird. Somit können beliebig viele UV-LEDs eingesetzt werden, ohne dass dadurch die Wärmestrahlung erhöht wird. Eine Schädigung des Substrats wird zuverlässig verhindert. LEDs besitzen zudem den Vorteil, dass sie keine Vorlauf- und/oder Nachlaufzeiten benötigen, so dass insgesamt eine schnellere Härtung der Beschichtung möglich ist. Auch weisen LEDs eine etwa zehnmal höhere Lebensdauer auf als herkömmliche gasbetriebene UV-Lampen, so dass Wartungsarbeiten minimiert werden können. Ein Leistungsverlust während der Lebensdauer der UV-LEDs tritt ebenfalls nicht auf. Auch beeinträchtigt der Ausfall lediglich einzelner LEDs innerhalb des LED-Arrays nicht die homogene und vollständige Härtung der Beschichtung. Weitere Vorteile der UV-LEDs gegenüber herkömmlichen UV-Lampen sind, dass diese bei gleicher Leistung einen geringeren Energieverbrauch aufweisen. Zudem enthalten UV-LEDs kein giftiges Quecksilber und es entsteht kein giftiges Ozon-Gas, da die Wellenlänge der UV-LEDs stets größer als 280 nm ist. Zurzeit existieren auf dem Markt Halbleiter-LEDs im monochromatischen Wellenlängenbereich von 365 nm, 375 nm, 385 nm, 395 nm und 405 nm. Jedoch werden in Zukunft auch Wellenlängen im Bereich von 280 nm bis 360 nm verfügbar sein.The use of UV LEDs to cure the maser print coating has the advantage that they emit monochromatic radiation, so that the emission of heat radiation is prevented. Thus, any number of UV LEDs can be used without thereby increasing the heat radiation. Damage to the substrate is reliably prevented. LEDs also have the advantage that they do not require any lead times and / or follow-up times, so that a total of faster curing of the coating is possible. Also, LEDs have about ten times longer life than conventional gas powered UV lamps, so maintenance can be minimized. A loss of power during the life of the UV LEDs also does not occur. Also, the failure of only single LEDs within the LED array does not affect the homogeneous and complete cure of the coating. Further advantages of the UV LEDs compared to conventional UV lamps are that they have a lower power consumption with the same power. In addition, UV LEDs contain no toxic mercury and there is no toxic ozone gas, since the wavelength of the UV LEDs is always greater than 280 nm. At present, there are semiconductor LEDs in the monochromatic wavelength range of 365 nm, 375 nm, 385 nm, 395 nm and 405 nm on the market. However, wavelengths in the range from 280 nm to 360 nm will also be available in the future.
Da die UV-LEDs grundsätzlich monochromatisches Licht abgeben, kann der Fotoinitiator der Maserdruckbeschichtung auf den jeweils zum Einsatz kommenden LED-Typ abgestimmt werden. Somit kann insgesamt die Zusammensetzung der Maserdruckbeschichtung vereinfacht werden, so dass eine Kostenreduzierung dadurch erreicht wird, dass nicht für sämtliche Lichtwellenlängen entsprechende Fotoinitiatoren vorzusehen sind. Sofern jedoch für die Härtung der Maserdruckbeschichtung auch unterschiedliche UV-LED-Typen zum Einsatz kommen sollen, die mehr als eine UV-Wellenlänge abstrahlen, kann die auf das Substrat aufgebrachte Maserdruckbeschichtung eine Mehrzahl von Fotoinitiatoren aufweisen, so dass im Wesentlichen für jede emittierte Wellenlänge ein Fotoinitiator mit dazu korrespondierendem Absorptionsmaximum vorgesehen ist. Es empiehlt sich beispielsweise, UV-LEDs mit Wellenlängen von 365 nm, 395 nm und 405 nm zu kombinieren.Since the UV LEDs generally emit monochromatic light, the photoinitiator of the maser pressure coating can be adapted to the type of LED used. Thus, overall, the composition of the Maserdruckbeschichtung can be simplified, so that a cost reduction is achieved in that are not provided for all wavelengths of light corresponding photoinitiators. However, if different UV-LED types are to be used for curing the maser printing coating, which is more than one UV wavelength can radiate, applied to the substrate maser pressure coating may have a plurality of photoinitiators, so that substantially for each emitted wavelength, a photoinitiator is provided with a corresponding absorption maximum. It is recommended, for example, to combine UV LEDs with wavelengths of 365 nm, 395 nm and 405 nm.
Schließlich lässt sich mit einem Array aus einer Vielzahl von UV-LEDs im Gegensatz zu den herkömmlichen UV-Lampen eine präzisere Strahlungsdichte auf der Oberfläche des Substrates und damit auch der Maserdruckbeschichtung erreichen, so dass insgesamt eine homogene Aushärtung der Beschichtung erreicht wird.Finally, with an array of a plurality of UV LEDs, in contrast to the conventional UV lamps, a more precise radiation density can be achieved on the surface of the substrate and thus also of the maser pressure coating, so that overall homogeneous curing of the coating is achieved.
Es ist weiterhin vorgesehen, dass in Abhängigkeit der Größe des Substrats die im Randbereich des UV-LED-Arrays über das Substrat hinausweisenden UV-LEDs oder UV-LED-Packungen abgeschaltet werden. Dabei lässt sich ganz gezielt insbesondere die Breite des LED-Arrays an die Breite des mit der Maserdruckbeschichtung beschichteten Substrats anpassen. So kann beispielsweise ein UV-LED-Array vorbestimmter Breite vorgesehen sein, das über eine Vielzahl von in Reihe hintereinander und nebeneinander angeordneten UV-LEDs verfügt. Je nach der Breite des zu bestrahlenden Substrats werden entsprechend viele LED-Spalten aktiviert. Nicht benötigte LED-Spalten bleiben dagegen ausgeschaltet. Dadurch können in Abhängigkeit des jeweiligen Substrats die tatsächlich für einen Aushärtungsvorgang benötigten LEDs aktiviert bzw. deaktiviert werden. Dadurch ergibt sich nicht zuletzt ein geringerer Energiebedarf.It is furthermore provided that, depending on the size of the substrate, the UV LEDs or UV LED packs projecting beyond the substrate in the edge region of the UV LED array are switched off. In this case, the width of the LED array can be specifically adapted to the width of the substrate coated with the maser printing coating. Thus, for example, a UV LED array of predetermined width can be provided, which has a multiplicity of UV LEDs arranged in series one after the other and next to one another. Depending on the width of the substrate to be irradiated, a corresponding number of LED columns are activated. Unnecessary LED columns remain switched off. As a result, the LEDs actually required for a curing process can be activated or deactivated depending on the respective substrate. This results not least in a lower energy consumption.
Es ist weiterhin vorgesehen, dass die Austrittsöffnungen der UV-LEDs im Wesentlichen senkrecht zur Oberfläche des Substrats ausgerichtet werden, so dass die emittierte Strahlung auf direktem Strahlwege auf das Substrat trifft. Gemäß dieser Anordnung wird es möglich, die Maserdruckbeschichtung direkt und homogen mit UV-Licht zu bestrahlen, so dass die auf dem Substrat aufgebrachte Beschichtung gleichmäßig ausgehärtet werden kann. Da die Erfindung somit zudem ohne Reflektoren und/oder Linsen zur Ausrichtung und Fokussierung der Strahlung auskommt, können die einzelnen UV-LEDs näher an die zu bestrahlende Maserdruckbeschichtung herangeführt werden. Im Gegensatz zu dem zuvor genannten Stand der Technik unter Verwendung von UV-LED-Arrays werden gemäß der hier gezeigten Erfindung keine Reflektoren eingesetzt, die das von den UV-LEDs emittierte Licht über eine Reflektionsfläche, beispielsweise ein Gehäuse, auf das Substrat leiten. Somit entfällt gemäß der Erfindung die im Stand der Technik von Zeit zu Zeit notwendige Reinigung der Reflektoren oder auch deren Nachjustage, da diese sich im Laufe der Zeit dejustieren können. Nicht zuletzt wird mit der Erfindung ebenfalls eine gleichmäßigere Bestrahlung des Substrates ermöglicht, welche bei der Verwendung von Reflektoren gar nicht stattfinden kann.It is further provided that the outlet openings of the UV LEDs are aligned substantially perpendicular to the surface of the substrate, so that the emitted radiation impinges on direct beam paths to the substrate. According to this arrangement, it becomes possible to directly and homogeneously irradiate the crayon printing coat with UV light, so that the coating applied to the substrate can be uniformly cured. Since the invention thus also requires no reflectors and / or lenses for aligning and focusing the radiation, the individual UV LEDs can be brought closer to the maser pressure coating to be irradiated. In contrast to the aforementioned prior art using UV LED arrays, according to the invention shown here, no reflectors are used which guide the light emitted by the UV LEDs over a reflection surface, for example a housing, onto the substrate. Thus omitted according to the invention in the state of Technique from time to time necessary cleaning of the reflectors or their readjustment, as they can maladjust in the course of time. Last but not least, a more uniform irradiation of the substrate is also made possible with the invention, which can not take place when using reflectors.
Es ist weiterhin vorgesehen, dass die UV-LEDs in einem Abstand von wenigen Millimetern zu der Oberfläche des Substrats angeordnet werden. Hierdurch lässt sich insgesamt der benötigte Bauraum reduzieren, so dass auch eine Vielzahl von UV-LEDs oder sogar UV-LED-Arrays platzsparend nebeneinander angeordnet werden kann.It is further provided that the UV LEDs are arranged at a distance of a few millimeters to the surface of the substrate. As a result, the required installation space can be reduced overall, so that even a multiplicity of UV LEDs or even UV LED arrays can be arranged next to one another to save space.
Neben dem zuvor dargestellten erfindungsgemäßen Verfahren zur Härtung einer auf einem Substrat angeordneten Maserdruckbeschichtung wird mit der Erfindung ebenso ausdrücklich speziell die Verwendung eines UV-LED-Arrays für die Härtung einer auf einem Substrat angeordneten Maserdruckbeschichtung unter Schutz gestellt, wobei die Maserdruckbeschichtung mindestens einen Fotoinitiator aufweist, und wobei das UV-LED-Array eine Vielzahl von UV-LEDs oder UV-LED-Packungen aufweist, deren emittierte Strahlung mindestens eine Wellenlänge im Bereich des Absorptionsspektrums des Fotoinitiators aufweist.In addition to the above-described inventive method for curing a maser printing coating arranged on a substrate, the invention also expressly specifically protects the use of a UV LED array for curing a maser printing coating arranged on a substrate, the maser printing coating having at least one photoinitiator, and wherein the UV LED array comprises a plurality of UV LEDs or UV LED packages whose emitted radiation has at least one wavelength in the range of the absorption spectrum of the photoinitiator.
Im Folgenden wird die Erfindung anhand eines Ausführungsbeispiels näher erläutert. Dieses Ausführungsbeispiel betrifft die Beschichtung eines Substrates mit einer Maserdruckbeschichtung, welche die Optik einer Holzmaserung oder auch einer Natursteinmaserung aufweisen soll. Es zeigen:
- Fig. 1
- ein UV-LED-Arrray in einer Ansicht von unten;
- Fig. 2
- ein von einem UV-LED-Array bestrahltes Substrat in Seitenansicht.
- Fig. 1
- a UV LED arrray in a bottom view;
- Fig. 2
- a substrate irradiated by a UV LED array in side view.
Zuerst wird das Substrat 3 mit der Maserdruckbeschichtung 4, welche einen Lack oder auch eine Tinte aufweisen kann, beschichtet. Diese Beschichtung 4 weist eine oder auch mehrere Fotoinitiatoren gleichzeitig auf, welche mit Lichtstrahlung je einer (oder auch mehrerer) bestimmten Wellenlänge aktiviert werden können, um zur Aushärtung der Beschichtung 4 zu führen.First, the
Für die Härtung der Maserdruckbeschichtung 4 nach dem erfindungsgemäßen Verfahren wird das Substrat 3 mit der Strahlung eines UV-LED-Arrays 1 bestrahlt. Das UV-LED-Array 1 weist dabei rasterförmig angeordnete UV-LEDs 2 auf, welche in Spalten und Zeilen ausgerichtet sind. Je nach der Breite des beschichteten Substrats 3 werden im Randbereich des UV-LED-Arrays 1 über das Substrat 3 hinausweisende UV-LEDs 2 abgeschaltet, so dass nur diejenigen UV-LEDs 2 angeschaltet sind, welche sich direkt über der Oberfläche des Substrats 3 befinden. Für den Härtungsvorgang wird nun das Substrat 3 bzw. die darauf angeordnete Maserdruckbeschichtung 4 mit der von den UV-LEDs 2 emittierten UV-Strahlung bestrahlt. Die UV-LEDs 2 emittieren dabei Strahlung je einer (oder auch mehrerer) Wellenlängen. Der zu der jeweiligen Strahlungswellenlänge korrespondierende Fotoinitiator absorbiert den jeweiligen Strahlungsanteil und initiiert dabei die Aushärtung der Beschichtung 4. Durch die Anordnung der UV-LEDs 2 in der Art, dass deren Austrittsöffnungen in Richtung des Substrats 3 weisen, wird das Substrat 3 verlustfrei und direkt bestrahlt, so dass sich eine besonders schnelle und homogene Härtung der Maserdruckbeschichtung 4 ergibt. Während des Härtungsvorgangs kann das Substrat 3 vorteilhaft auch kontinuierlich über bzw. unter dem UV-LED-Array 1 - wie auf einem Fließband - hindurchgezogen werden. Das ausgehärtete Produkt ist anschließend einsatzbereit.For the curing of the
Insgesamt wird somit durch die Erfindung eine besonders platzsparende und kostengünstige Lösung zur Härtung einer auf einem Substrat 3 aufgebrachten Maserdruckbeschichtung 4 geschaffen. Dabei wird das beschichtete Substrat 3 direkt, d.h. ohne den Umweg über Reflektoren oder Linsen, mit der Strahlung der UV-LEDs 2 bestrahlt. Dadurch entfallen im Stand der Technik vorhandene Probleme durch Verschmutzungen der Reflektoren, Dejustagen der Reflektoren oder ein erhöhtes Baumaß der gesamten Vorrichtung.Overall, the invention thus provides a particularly space-saving and cost-effective solution for hardening a
- 11
- UV-LichtquelleUV-light source
- 22
- UV-LEDsUV-LEDs
- 33
- Substratsubstratum
- 44
- MaserdruckbeschichtungGrain print coat
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP13154872.9A EP2765000A1 (en) | 2013-02-12 | 2013-02-12 | Hardening of wood imitation coating arranged on a substrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP13154872.9A EP2765000A1 (en) | 2013-02-12 | 2013-02-12 | Hardening of wood imitation coating arranged on a substrate |
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| Publication Number | Publication Date |
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| EP2765000A1 true EP2765000A1 (en) | 2014-08-13 |
Family
ID=47748412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13154872.9A Withdrawn EP2765000A1 (en) | 2013-02-12 | 2013-02-12 | Hardening of wood imitation coating arranged on a substrate |
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| Country | Link |
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| EP (1) | EP2765000A1 (en) |
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| CN105413991A (en) * | 2015-12-08 | 2016-03-23 | 淮南纪兴源机电设备有限公司 | Reciprocating type UV curing machine |
| CN106183391A (en) * | 2016-08-31 | 2016-12-07 | 黑金刚（福建）自动化科技股份公司 | A kind of energy-conservation vamp printing equipment |
| US10180248B2 (en) | 2015-09-02 | 2019-01-15 | ProPhotonix Limited | LED lamp with sensing capabilities |
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