EP2209563A2 - Portable ultraviolet and visible light lamp - Google Patents

Portable ultraviolet and visible light lamp

Info

Publication number
EP2209563A2
EP2209563A2 EP08804709A EP08804709A EP2209563A2 EP 2209563 A2 EP2209563 A2 EP 2209563A2 EP 08804709 A EP08804709 A EP 08804709A EP 08804709 A EP08804709 A EP 08804709A EP 2209563 A2 EP2209563 A2 EP 2209563A2
Authority
EP
European Patent Office
Prior art keywords
uva
cooling medium
lamp
portable
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08804709A
Other languages
German (de)
French (fr)
Inventor
Maarten Van Pul
Huig Klinkenberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Akzo Nobel Coatings International BV
Original Assignee
Akzo Nobel Coatings International BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Akzo Nobel Coatings International BV filed Critical Akzo Nobel Coatings International BV
Priority to EP08804709A priority Critical patent/EP2209563A2/en
Publication of EP2209563A2 publication Critical patent/EP2209563A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • B05D5/005—Repairing damaged coatings
    • 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
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies

Definitions

  • the invention relates to a portable ultraviolet and visible light (UVA/IS) lamp having a plurality of UVA/IS light emitting diodes (UVA/IS-LEDs) as UVA/IS radiation source.
  • UVA/IS-LEDs UVA/IS light emitting diodes
  • the invention further relates to a process of preparing a cured coating.
  • Hand-held portable UVA/IS-LED lamps are commercially available, for example from Panacol-Elosol GmbH in Germany or from Clearstone Technologies Inc. in the United States of America. Movable UVA/IS lamps for curing surface coated materials are described in International Patent Application WO 2006/047866 A.
  • UVA/IS radiation sources mounted on a positioning panel supported by a stand.
  • Fluorescent lamps, LEDs, electron beams, and lasers are mentioned as suitable radiation sources.
  • air cooling by a blower, fan or pressurized air is mentioned.
  • UVA/IS-LED lamps A drawback of the known hand-help UVA/IS-LED lamps is the limited UVA/IS light intensity they generate, as well as the limited area covered by the UVA/IS radiation.
  • UVA/IS-LEDs are characterized by a more efficient conversion of electric energy into UVA/IS radiation than traditional UVA/IS radiation sources, such as fluorescent lamps, or metal halide lamps.
  • traditional UVA/IS radiation sources such as fluorescent lamps, or metal halide lamps.
  • UVA/IS- LEDs a significant proportion of the electric energy is transformed into heat.
  • the maximum operating temperature of LED is generally lower, about 120 0 C, than the operating temperature of conventional UV lamps.
  • the durability of UVA/IS-LEDs decreases when they are operated at too high temperature.
  • cooling means are required in order to prevent overheating of the UVA/IS-LED lamp.
  • cooling means such as blowers or fans generally add to the complexity, weight, and size of a portable UVA/IS-LED device.
  • the present invention seeks to alleviate the above-mentioned problems. More in particular, the invention seeks to provide a portable UVA/IS-LED lamp capable of generating high intensity UVA/IS radiation and having simple, small and light weight cooling means.
  • the invention now provides a portable ultraviolet (UVA/IS) lamp having a UVA/IS-light emitting diode (UVA/IS-LED) unit comprising a plurality of UVA/IS- LEDs as UVA/IS radiation source, a UVA/IS-LED electric power supply, and a cooling medium feed line connectable to a cooling medium reservoir for providing a flow of cooling medium to the UVA/IS-LEDs.
  • UVA/IS UVA/IS-light emitting diode
  • UVA/IS-LEDs have several advantages over conventional sources of UVA/IS radiation.
  • UVA/IS-LEDs allow instant on/off switching of the UVA/IS radiation source, which adds flexibility.
  • the service life of UVA/IS- LEDs generally is significantly longer than the service life of conventional UVA/IS sources, for example up to 50,000 hours for a UVA/IS-LED compared to about 1 ,000 hours for conventional UVA/IS lamps.
  • UVA/IS-LEDs generally have a narrow wavelength distribution and offer the possibility to customize the peak wavelength.
  • the peak wavelength of the UVA/IS-LEDs suitable is between 200 nm and 500 nm. When pure UV light is required, the peak wavelength suitably is between 200 and 400 nm.
  • UV-LEDs having a peak wavelength in the range of 320 to 400 nm In order to reduce the health risks associated with skin and eye exposure to UV radiation, it may be preferable to use UV-LEDs having a peak wavelength in the range of 320 to 400 nm. However, it is also possible to use UVA/IS-LEDs having a peak wavelength in the wavelength range of visible light, such as 400 nm to 500 nm. Another advantage of UVA/IS-LEDs is their relatively low working voltage, which is preferred in a paint spray booth environment compared to the higher voltages needed for normal UVA/IS lamps.
  • the plurality of UVA/IS-LEDs of the lamp can suitably be grouped together in a so-called UVA/IS-LED array.
  • the number of individual UVA/IS-LEDs in a UVA/IS-LED array can be customized depending on the required size, shape, and UVA/IS radiation output required.
  • a UVA/IS-LED array can for example comprise 10 to 50, or several hundreds or even thousands of individual UVA/IS- LEDs.
  • the shape of the UVA/IS-LED array is not critical. It may be of any suitable shape. As an example, a circular UVA/IS-LED array to be placed around the nozzle of a paint spray gun may be mentioned.
  • the UVA/IS-LED electric power supply can be a battery pack.
  • the batteries are rechargeable. It is also possible to use a power supply connected to the electric power grid.
  • the cooling medium feed line is connected to the UVA/IS lamp so as to provide a flow of cooling medium to the UVA/IS-LEDs.
  • the cooling medium feed line suitably is made of a flexible material, for example rubber or plastic, which may optionally be reinforced with fibers or wires.
  • the cooling medium feed line can be permanently attached to the UVA/IS lamp. Alternatively, the cooling medium feed line can be releasably attached to the UVA/IS lamp, for example by a bayonet-type fitting.
  • the cooling medium feed line is connectable to a cooling medium reservoir. In operation, the cooling medium feed line is connected to the cooling medium reservoir. Cooling medium will then flow from the reservoir to the UVA/IS-LEDs in order to cool them.
  • the cooling medium can be a liquid cooling medium or it can be a gas, in particular a compressed gas.
  • An example of a suitable liquid cooling medium is water.
  • An example of a gaseous cooling medium is compressed air. Compressed air is particularly suitable as cooling medium when the UVA/IS lamp is used for UVA/IS curing of paint, because compressed air reservoirs are present anyway in many paint spray shops.
  • the UVA/IS lamp additionally comprises a cooling medium discharge line for discharge of the cooling medium.
  • the cooling medium can be disposed off through the cooling medium discharge line or it can be recycled to the cooling medium reservoir.
  • the portable UVA/IS lamp suitably is a hand-held device.
  • the UVA/IS lamp can be used as such as hand-held UVA/IS lamp.
  • the UVA/IS lamp can be used as such as hand-held UVA/IS lamp.
  • the UVA/IS lamp can be used as such as hand-held UVA/IS lamp.
  • UVA/IS lamp can be part of a paint spray gun, for example such as described in
  • the UVA/IS lamp can be permanently attached to the paint spray gun.
  • the UVA/IS lamp can be permanently attached to the paint spray gun.
  • UVA/IS lamp has means for releasably attaching the UVA/IS lamp to a paint spray gun.
  • the UVA/IS lamp can be used as such or attached to a paint spray gun. It is also possible to releasably combine the UVA/IS lamp with a specific holder to allow easy manipulation of the UVA/IS lamp.
  • the cooling medium stream path comprises a valve for control of cooling medium flow.
  • the cooling medium stream path includes the cooling medium feed line, the interior of the UVA/IS-LED unit, and the optional cooling medium discharge line.
  • the UVA/IS-LED power supply switch is preferably implemented in such a way that the power supply can only be switched on when the valve in the cooling medium stream path is open. This can for example be achieved by physically coupling the trigger for opening the valve and the button for actuating the electrical switch of the power supply.
  • the cooling medium stream path comprises a valve for control of cooling medium flow and a sensor to detect the flow of cooling medium.
  • the UVA/IS-LED power supply can be switched on or off as a function of flow of cooling medium detected by the sensor.
  • the term flow sensor includes embodiments wherein flow is detected by pressure differences sensed by one or more pressure sensors.
  • the sensor can cause the UVA/IS-LED power supply to be switched on.
  • the sensor can cause the UVA/IS-LED power supply to be switched off.
  • the predetermined flow value can be 0 l/min.
  • the device is switched on when the flow of cooling medium exceeds 0 l/min and the device is switched off when there is no flow of cooling medium.
  • the flow of cooling medium is generally actuated by the user, for example by pulling a trigger to open the valve in the cooling medium stream path, for example in the feed line.
  • the UVA/IS-LED power supply and accordingly the UVA/IS-LEDs Upon flow of the cooling medium, the UVA/IS-LED power supply and accordingly the UVA/IS-LEDs will be switched on, and they will be switched off when the flow of cooling medium stops, for example when the trigger is released. In such an embodiment it is assured that UVA/IS-LEDs will only be switched on if there is sufficient flow of cooling medium. Therefore, overheating of the UVA/IS-LEDs can be safely excluded.
  • Portable UVA/IS lamps are frequently used for curing UVA/IS-curable coatings and adhesives. Coating and adhesive materials often contain volatile organic compounds, such as solvents and/or monomers, which evaporate during and/or after application to a substrate. This can lead to an explosive atmosphere in the vicinity of the coated substrate.
  • UVA/IS lamps which are not explosion-proof can only be started after an aeration period sufficient to remove the volatile organic compounds. This brings about a delay in the entire process and can have a negative impact on the economy of the coating process. It should be noted that UVA/IS curing processes are frequently very fast. As a consequence, the above-mentioned aeration phase may become the bottleneck for optimizing the process speed for coating and UVA/IS curing. Therefore, there is a need in the coating and adhesive industry for a portable UVA/IS lamp which can safely be used immediately after application of a coating or adhesive layer in an explosive environment.
  • the portable UVA/IS lamp of the invention can be easily adapted for safe use in an explosive environment.
  • the UVA/IS-LED power supply and the sensor for detecting the flow of cooling medium from the UVA/IS-LED unit.
  • the sensor to detect the flow of cooling medium and the UVA/IS-LED electric power supply are suitably located in an area with a non-explosive atmosphere.
  • the UVA/IS-LED unit cannot trigger an explosion during normal operation, because all electrical parts which could trigger an ignition or explosion can be located outside the area of explosive atmosphere. Additional measures can be taken to minimize explosion risk in case of likely failures, such as mechanical damage. An example of such an additional measure is creating and automatically monitoring overpressure in the LED chamber. Upon failure of the overpressure, the device is automatically switched off.
  • a mechanical trigger to open the valve in the cooling medium feed or discharge line can be located close to the UVA/IS-LED unit.
  • the UVA/IS-LED lamp can be switched on or off by an operator actuating the mechanical trigger in the vicinity of the UVA/IS-LED unit. Pulling the mechanical trigger in the explosive atmosphere opens the valve in the cooling medium feed or discharge line. This starts the flow of cooling medium which is detected by the flow sensor outside the explosive environment. In response to detected flow, the flow sensor causes the UVA/IS-LED power supply, which is also located outside the explosive environment, to be switched on.
  • the UVA/IS lamp of the invention can be used for all purposes where UVA/IS radiation is required.
  • the UVA/IS lamp is particularly suitable for curing UVA/IS radiation-curable coatings and adhesives. Therefore, the invention also relates to a process of preparing a cured coating comprising applying a UVA/IS-curable coating composition to a substrate and curing the coating by irradiation with UVA/IS-radiation, wherein the UVA/IS radiation is provided by the portable UVA/IS lamp according to the invention.
  • the substrate can for example be an automobile or a large transportation vehicle, such as a train, bus, truck, or aircraft.
  • the process can also be implemented for repair coating of automobiles and transportation vehicles.
  • the process is particularly suitable for repair purposes wherein only a part of the substrate, for example an individual body panel or a damaged spot, is provided with a repair coating.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Led Device Packages (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

The invention relates to a portable ultraviolet/visible light (UVA/IS) lamp having a UVA/IS-light emitting diode (UVA/IS-LED) unit comprising a plurality of UVA/IS-LEDs as UVA/IS radiation source, a UVA/IS-LED electric power supply, and a cooling medium feed line connectable to a cooling medium reservoir for providing a flow of cooling medium to the UVA/IS-LEDs.

Description

Portable Ultraviolet and Visible Light Lamp
The invention relates to a portable ultraviolet and visible light (UVA/IS) lamp having a plurality of UVA/IS light emitting diodes (UVA/IS-LEDs) as UVA/IS radiation source. The invention further relates to a process of preparing a cured coating.
Hand-held portable UVA/IS-LED lamps are commercially available, for example from Panacol-Elosol GmbH in Germany or from Clearstone Technologies Inc. in the United States of America. Movable UVA/IS lamps for curing surface coated materials are described in International Patent Application WO 2006/047866 A.
This document describes UVA/IS radiation sources mounted on a positioning panel supported by a stand. Fluorescent lamps, LEDs, electron beams, and lasers are mentioned as suitable radiation sources. In connection with fluorescent lamps, air cooling by a blower, fan or pressurized air is mentioned.
A drawback of the known hand-help UVA/IS-LED lamps is the limited UVA/IS light intensity they generate, as well as the limited area covered by the UVA/IS radiation. UVA/IS-LEDs are characterized by a more efficient conversion of electric energy into UVA/IS radiation than traditional UVA/IS radiation sources, such as fluorescent lamps, or metal halide lamps. However, also in UVA/IS- LEDs a significant proportion of the electric energy is transformed into heat. In addition, the maximum operating temperature of LED is generally lower, about 1200C, than the operating temperature of conventional UV lamps. The durability of UVA/IS-LEDs decreases when they are operated at too high temperature. Therefore, increasing the UVA/IS light intensity and the area covered by UVA/IS generation by using a higher number of individual UVA/IS- LEDs leads to the problem of increased operating temperature of the UVA/IS- LEDs. Therefore, cooling means are required in order to prevent overheating of the UVA/IS-LED lamp. However, cooling means such as blowers or fans generally add to the complexity, weight, and size of a portable UVA/IS-LED device.
The present invention seeks to alleviate the above-mentioned problems. More in particular, the invention seeks to provide a portable UVA/IS-LED lamp capable of generating high intensity UVA/IS radiation and having simple, small and light weight cooling means.
The invention now provides a portable ultraviolet (UVA/IS) lamp having a UVA/IS-light emitting diode (UVA/IS-LED) unit comprising a plurality of UVA/IS- LEDs as UVA/IS radiation source, a UVA/IS-LED electric power supply, and a cooling medium feed line connectable to a cooling medium reservoir for providing a flow of cooling medium to the UVA/IS-LEDs.
The use of UVA/IS-LEDs has several advantages over conventional sources of UVA/IS radiation. UVA/IS-LEDs allow instant on/off switching of the UVA/IS radiation source, which adds flexibility. Furthermore, the service life of UVA/IS- LEDs generally is significantly longer than the service life of conventional UVA/IS sources, for example up to 50,000 hours for a UVA/IS-LED compared to about 1 ,000 hours for conventional UVA/IS lamps. Further, UVA/IS-LEDs generally have a narrow wavelength distribution and offer the possibility to customize the peak wavelength. The peak wavelength of the UVA/IS-LEDs suitable is between 200 nm and 500 nm. When pure UV light is required, the peak wavelength suitably is between 200 and 400 nm. In order to reduce the health risks associated with skin and eye exposure to UV radiation, it may be preferable to use UV-LEDs having a peak wavelength in the range of 320 to 400 nm. However, it is also possible to use UVA/IS-LEDs having a peak wavelength in the wavelength range of visible light, such as 400 nm to 500 nm. Another advantage of UVA/IS-LEDs is their relatively low working voltage, which is preferred in a paint spray booth environment compared to the higher voltages needed for normal UVA/IS lamps.
The plurality of UVA/IS-LEDs of the lamp can suitably be grouped together in a so-called UVA/IS-LED array. The number of individual UVA/IS-LEDs in a UVA/IS-LED array can be customized depending on the required size, shape, and UVA/IS radiation output required. A UVA/IS-LED array can for example comprise 10 to 50, or several hundreds or even thousands of individual UVA/IS- LEDs. The shape of the UVA/IS-LED array is not critical. It may be of any suitable shape. As an example, a circular UVA/IS-LED array to be placed around the nozzle of a paint spray gun may be mentioned.
The UVA/IS-LED electric power supply can be a battery pack. In one embodiment, the batteries are rechargeable. It is also possible to use a power supply connected to the electric power grid.
The cooling medium feed line is connected to the UVA/IS lamp so as to provide a flow of cooling medium to the UVA/IS-LEDs. The cooling medium feed line suitably is made of a flexible material, for example rubber or plastic, which may optionally be reinforced with fibers or wires. The cooling medium feed line can be permanently attached to the UVA/IS lamp. Alternatively, the cooling medium feed line can be releasably attached to the UVA/IS lamp, for example by a bayonet-type fitting. The cooling medium feed line is connectable to a cooling medium reservoir. In operation, the cooling medium feed line is connected to the cooling medium reservoir. Cooling medium will then flow from the reservoir to the UVA/IS-LEDs in order to cool them. The cooling medium can be a liquid cooling medium or it can be a gas, in particular a compressed gas. An example of a suitable liquid cooling medium is water. An example of a gaseous cooling medium is compressed air. Compressed air is particularly suitable as cooling medium when the UVA/IS lamp is used for UVA/IS curing of paint, because compressed air reservoirs are present anyway in many paint spray shops. When air or a similar non-toxic gas or gas mixture is used a cooling medium, the cooling medium can be discharged directly into the environment without any negative consequences. In a further embodiment, the UVA/IS lamp additionally comprises a cooling medium discharge line for discharge of the cooling medium. Depending on the type of cooling medium used, the cooling medium can be disposed off through the cooling medium discharge line or it can be recycled to the cooling medium reservoir.
The portable UVA/IS lamp suitably is a hand-held device. The UVA/IS lamp can be used as such as hand-held UVA/IS lamp. In another embodiment, the
UVA/IS lamp can be part of a paint spray gun, for example such as described in
International Patent Application WO2004/069427. The UVA/IS lamp can be permanently attached to the paint spray gun. In another embodiment, the
UVA/IS lamp has means for releasably attaching the UVA/IS lamp to a paint spray gun. In this case the UVA/IS lamp can be used as such or attached to a paint spray gun. It is also possible to releasably combine the UVA/IS lamp with a specific holder to allow easy manipulation of the UVA/IS lamp.
In one embodiment, the cooling medium stream path comprises a valve for control of cooling medium flow. The cooling medium stream path includes the cooling medium feed line, the interior of the UVA/IS-LED unit, and the optional cooling medium discharge line. The UVA/IS-LED power supply switch is preferably implemented in such a way that the power supply can only be switched on when the valve in the cooling medium stream path is open. This can for example be achieved by physically coupling the trigger for opening the valve and the button for actuating the electrical switch of the power supply. In a further embodiment, the cooling medium stream path comprises a valve for control of cooling medium flow and a sensor to detect the flow of cooling medium. The UVA/IS-LED power supply can be switched on or off as a function of flow of cooling medium detected by the sensor. It should be noted that the term flow sensor includes embodiments wherein flow is detected by pressure differences sensed by one or more pressure sensors. When the flow in the cooling medium stream path exceeds a predetermined value, the sensor can cause the UVA/IS-LED power supply to be switched on. When the detected flow is below a predetermined value, the sensor can cause the UVA/IS-LED power supply to be switched off. In a simplified embodiment, the predetermined flow value can be 0 l/min. In that case, the device is switched on when the flow of cooling medium exceeds 0 l/min and the device is switched off when there is no flow of cooling medium. The flow of cooling medium is generally actuated by the user, for example by pulling a trigger to open the valve in the cooling medium stream path, for example in the feed line. Upon flow of the cooling medium, the UVA/IS-LED power supply and accordingly the UVA/IS-LEDs will be switched on, and they will be switched off when the flow of cooling medium stops, for example when the trigger is released. In such an embodiment it is assured that UVA/IS-LEDs will only be switched on if there is sufficient flow of cooling medium. Therefore, overheating of the UVA/IS-LEDs can be safely excluded. Portable UVA/IS lamps are frequently used for curing UVA/IS-curable coatings and adhesives. Coating and adhesive materials often contain volatile organic compounds, such as solvents and/or monomers, which evaporate during and/or after application to a substrate. This can lead to an explosive atmosphere in the vicinity of the coated substrate. Therefore, curing with UVA/IS lamps which are not explosion-proof can only be started after an aeration period sufficient to remove the volatile organic compounds. This brings about a delay in the entire process and can have a negative impact on the economy of the coating process. It should be noted that UVA/IS curing processes are frequently very fast. As a consequence, the above-mentioned aeration phase may become the bottleneck for optimizing the process speed for coating and UVA/IS curing. Therefore, there is a need in the coating and adhesive industry for a portable UVA/IS lamp which can safely be used immediately after application of a coating or adhesive layer in an explosive environment. The portable UVA/IS lamp of the invention can be easily adapted for safe use in an explosive environment. This can be greatly facilitated by spatially separating the UVA/IS-LED power supply and the sensor for detecting the flow of cooling medium from the UVA/IS-LED unit. The sensor to detect the flow of cooling medium and the UVA/IS-LED electric power supply are suitably located in an area with a non-explosive atmosphere. The UVA/IS-LED unit cannot trigger an explosion during normal operation, because all electrical parts which could trigger an ignition or explosion can be located outside the area of explosive atmosphere. Additional measures can be taken to minimize explosion risk in case of likely failures, such as mechanical damage. An example of such an additional measure is creating and automatically monitoring overpressure in the LED chamber. Upon failure of the overpressure, the device is automatically switched off. A mechanical trigger to open the valve in the cooling medium feed or discharge line can be located close to the UVA/IS-LED unit. In such an embodiment, the UVA/IS-LED lamp can be switched on or off by an operator actuating the mechanical trigger in the vicinity of the UVA/IS-LED unit. Pulling the mechanical trigger in the explosive atmosphere opens the valve in the cooling medium feed or discharge line. This starts the flow of cooling medium which is detected by the flow sensor outside the explosive environment. In response to detected flow, the flow sensor causes the UVA/IS-LED power supply, which is also located outside the explosive environment, to be switched on.
The UVA/IS lamp of the invention can be used for all purposes where UVA/IS radiation is required. The UVA/IS lamp is particularly suitable for curing UVA/IS radiation-curable coatings and adhesives. Therefore, the invention also relates to a process of preparing a cured coating comprising applying a UVA/IS-curable coating composition to a substrate and curing the coating by irradiation with UVA/IS-radiation, wherein the UVA/IS radiation is provided by the portable UVA/IS lamp according to the invention. The substrate can for example be an automobile or a large transportation vehicle, such as a train, bus, truck, or aircraft. The process can also be implemented for repair coating of automobiles and transportation vehicles. The process is particularly suitable for repair purposes wherein only a part of the substrate, for example an individual body panel or a damaged spot, is provided with a repair coating.

Claims

Claims
1. A portable ultraviolet/visible light (UV/VIS) lamp having a UV/VIS-light emitting diode (UVA/IS-LED) unit comprising a plurality of UVA/IS-LEDs as UV/VIS radiation source, a UVA/IS-LED electric power supply, and a cooling medium feed line connectable to a cooling medium reservoir for providing a flow of cooling medium to the UVA/IS-LEDs.
2. The portable UVA/IS lamp according to claim 1 , wherein the UVA/IS lamp additionally comprises a cooling medium discharge line.
3. The portable UVA/IS lamp according to any one of the preceding claims, wherein the cooling medium stream path comprises a valve for control of the flow of cooling medium and a sensor to detect the flow of cooling medium, and wherein the UVA/IS-LED power supply can be switched on or off as a function of flow of cooling medium detected by the sensor.
4. The portable UVA/IS lamp according to any one of the preceding claims, wherein the UVA/IS lamp is a hand-held UVA/IS lamp.
5. The portable UVA/IS lamp according to any one of the preceding claims, wherein the UVA/IS lamp is part of a paint spray gun.
6. The portable UVA/IS lamp according to any one of the preceding claims, wherein the UVA/IS lamp has means for removable attachment of the lamp to a paint spray gun or to a holder.
7. The portable UVA/IS lamp according to any one of the preceding claims, wherein the cooling medium feed line is connected to a cooling medium reservoir containing a compressed gas.
8. The portable UVA/IS lamp according to claim 7, wherein the compressed gas is compressed air.
9. The portable UVA/IS lamp according to claim 3, wherein the UVA/IS lamp is adapted for operation in an explosive atmosphere.
10. The portable UVA/IS lamp according to claim 9, wherein the sensor to detect the flow of cooling medium and the UVA/IS-LED electric power supply are spatially separated from the UVA/IS-LED unit.
11. The portable UVA/IS lamp according to claim 10, wherein the sensor to detect the flow of cooling medium and the UVA/IS-LED electric power supply are located in an area with a non-explosive atmosphere.
12.A process of preparing a cured coating comprising applying a UVA/IS- curable coating composition to a substrate and curing the coating by irradiation with UVA/IS-radiation, wherein the UVA/IS radiation is provided by the portable UVA/IS lamp according to any one of the preceding claims.
13.A process according to claim 12, wherein the substrate is an automobile or a large transportation vehicle.
EP08804709A 2007-09-28 2008-09-25 Portable ultraviolet and visible light lamp Withdrawn EP2209563A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08804709A EP2209563A2 (en) 2007-09-28 2008-09-25 Portable ultraviolet and visible light lamp

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP07117507 2007-09-28
US97660507P 2007-10-01 2007-10-01
EP08804709A EP2209563A2 (en) 2007-09-28 2008-09-25 Portable ultraviolet and visible light lamp
PCT/EP2008/062809 WO2009040387A2 (en) 2007-09-28 2008-09-25 Portable ultraviolet and visible light lamp

Publications (1)

Publication Number Publication Date
EP2209563A2 true EP2209563A2 (en) 2010-07-28

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Family Applications (1)

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EP08804709A Withdrawn EP2209563A2 (en) 2007-09-28 2008-09-25 Portable ultraviolet and visible light lamp

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JP (1) JP2011502031A (en)
KR (1) KR20100075554A (en)
CN (1) CN101808752A (en)
BR (1) BRPI0815997A2 (en)
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WO (1) WO2009040387A2 (en)

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CN101808752A (en) 2010-08-18
RU2010116692A (en) 2011-11-10
BRPI0815997A2 (en) 2018-03-27
AU2008303518A1 (en) 2009-04-02
KR20100075554A (en) 2010-07-02
JP2011502031A (en) 2011-01-20
WO2009040387A3 (en) 2009-05-22
RU2473837C2 (en) 2013-01-27
WO2009040387A2 (en) 2009-04-02

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