EP2113309A1 - Dispositif de durcissement par rayonnement UV - Google Patents

Dispositif de durcissement par rayonnement UV Download PDF

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Publication number
EP2113309A1
EP2113309A1 EP08104441A EP08104441A EP2113309A1 EP 2113309 A1 EP2113309 A1 EP 2113309A1 EP 08104441 A EP08104441 A EP 08104441A EP 08104441 A EP08104441 A EP 08104441A EP 2113309 A1 EP2113309 A1 EP 2113309A1
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EP
European Patent Office
Prior art keywords
radiation
radiation sources
housing
longitudinal axis
sources
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Withdrawn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
EP08104441A
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German (de)
English (en)
Inventor
Volker Schrage
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP2113309A1 publication Critical patent/EP2113309A1/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
    • B05D3/065—After-treatment
    • B05D3/067—Curing or cross-linking the coating

Definitions

  • the invention relates to a device for UV radiation curing of objects having at least two elongate radiation sources whose light can be supplied to the object to be cured for the purpose of curing.
  • Such devices for UV radiation curing are used in the coating of objects made of heat-sensitive materials, in particular plastics, which are coated with UV lacquers and printing inks.
  • the objects can be present, for example, as shaped bodies, such as, for example, bottles or disks, or as films and webs.
  • UV radiation in the wavelength range of 200-400 nm is used for radiation curing.
  • homogeneity of the irradiation is of crucial importance.
  • UV medium-pressure gas discharge lamps are used, in which a plasma is generated by the evaporation of metals.
  • the lamps consist essentially of a tubular elongated glass body, two electrodes, two Folieneinschmelzonne and two sockets.
  • the operating temperatures on the glass body are between 700 ° C and 900 ° C.
  • the radiation sources are usually suspended at the two outer ends and are at least partially surrounded by a reflector.
  • the radiation sources are designed in such a way that the energy absorbed by the glass is released by free convection and by radiation. A balance between the amount of energy absorbed and delivered results at a temperature of the glass body of about 800 ° C.
  • the reflectors and the housing of the UV radiation curing device hinder this condition. It comes to reflections of heat radiation and sometimes even to heat accumulation in the vicinity of the radiation source.
  • the disadvantage here that even with optimal cooling of the free-hanging, that is only end held radiation source from a critical electrical energy in conjunction with a critical length, the temperature of the glass body is so high that deform all known UV radiation sources with gravity ,
  • the plasma formed in the lamp can come into contact with the vitreous body at certain points. The contact leads to overheating and thus to the destruction of the glass body of the radiation source.
  • UV radiation sources In order to reduce the deformation, it is therefore necessary in the prior art to reduce the overall length of irradiation devices, in particular UV irradiation devices and at the same time at greater lengths, the electrical power of the UV radiation source.
  • Conventional UV radiation sources therefore have a maximum length of about 2.8 meters. In radiant curing of floors, however, irradiation widths of four to sometimes even five meters are required. In printing machines, even irradiation widths of up to six meters can be found.
  • FIGS. 1 to 3 show several devices for UV radiation curing, in a row are arranged in alignment with each other. Due to the arranged at the front ends of the radiation sources and the electrodes arranged in the housings for receiving the radiation sources is due to the design between the individual devices no UV radiation available.
  • FIG. 2 a UV radiation sources, which are offset in series, but individually to a center line and partially arranged at an angle to each other (see. FIG. 2 b) ,
  • FIGS. 1 to 3 arrangements for UV radiation curing above the object to be cured all have the disadvantage of a non-homogeneous UV radiation distribution, in particular in the region of the ends of the UV radiation sources or in the overlap region of two adjacent devices for UV radiation curing.
  • the resulting uneven distribution of the electromagnetic radiation, in particular the UV and IR radiation causes an undesirable, non-uniform curing of the coating. This may result in different degrees of gloss in flat coatings, for example of paints, which are optically banding in web materials.
  • the devices for UV radiation curing at a greater distance than usual of the mounted to be irradiated object to produce a diffused radiation are used to compensate for this uneven distribution at least to some extent.
  • the normally usual distance to the object of about 30 to 100 mm is increased to about 200 to 300 mm.
  • the distance decreases the UV radiation intensity, which is crucial for UV radiation curing, strongly, an overall higher UV radiation power must be installed. This results in significant additional costs for the device for hardening hardening and increased power consumption.
  • the device consists of three units, which are constructed substantially similar. Each unit includes a UV tube, a parabolic reflector and a flat mirror system
  • the parabolic reflectors divert the radiation from the UV tubes parallel to a plane containing all the UV tubes.
  • the plane mirror systems direct the reflections from the parabolic reflectors Radiation in each case by 90 degrees in the direction of the surface to be irradiated.
  • the length of the planar mirror systems is shorter than the length of the associated parabolic reflectors, which in turn is shorter than the associated UV tubes.
  • the mirrors shield the ends of the UV tubes and their sockets.
  • the dead areas of the UV tube are hidden, so that the associated mirror systems only the portions of the UV tubes are exposed, which is a substantially deliver uniform radiation intensity.
  • the units of UV tube, reflector and mirror are in a housing, which in turn is housed in a surrounding housing.
  • the UV tubes overlap on about half their length of the lamp body.
  • the invention is based on the object to provide a device for UV radiation curing, especially heat-sensitive objects, which allows a uniform distribution of radiation over a large irradiation width with low design effort and without affecting the life of the radiation sources.
  • This object is achieved in a device for UV radiation curing of the type mentioned above in that all the radiation sources are arranged in a single common housing with a reflector system and an outlet opening for the electromagnetic radiation, the elongated housing is cylindrical and the radiation sources in the direction the longitudinal axis L of the housing are arranged and arranged in the direction of the longitudinal axis L in succession and offset from the longitudinal axis L of the housing radiation sources do not overlap in the region of the arranged between the electrodes of each radiation source lamp body.
  • the overlap of the radiation sources arranged one behind the other is chosen so that no overlapping of adjacent radiation sources in the region of the radiating glass bulb of the radiation source he follows.
  • the result of the inventive series connection of the radiation sources in a single common housing is a homogeneous UV radiation image over the entire working width with the lowest possible energy consumption. Also, the cooling power of unwanted infrared radiant energy that heats the environment of the UV radiation sources can be reduced. Finally, it has been found in practice that the durability of the radiation sources in the device according to the invention is significantly prolonged.
  • the radiation sources are arranged one behind the other in the direction of the longitudinal axis of the device and in each case offset relative to the longitudinal axis of the housing, wherein the offset is selected such that the electrodes of adjacent radiation sources do not come into contact. This makes it possible, at least one, but preferably all of the radiation sources separately switched on and off, so that only those radiation sources are supplied with power, which are necessary for the respective radiation curing.
  • a further improvement in homogeneity can be achieved if a plurality of radiation sources having a length of ten to one hundred and fifty centimeters, preferably relatively short radiation sources having a length of twenty to forty centimeters, are arranged in the housing of the UV radiation curing device.
  • This proposal is based on the finding that, due to their design, UV radiation sources of smaller lengths have a more homogeneous radiation pattern over the entire length of the radiation source.
  • an electrode distance of 270 mm has been found to be particularly advantageous.
  • an overlap of the electrodes of mutually offset, adjacent radiation sources, in particular over a length of in particular 3 mm gives the best result with regard to a homogeneous radiation distribution.
  • the most demanding irradiation tasks that is to say working widths of up to 6.5 meters, can be realized in printing machines and even beyond.
  • FIG. 4 illustrates the device for UV radiation hardening in a view from below.
  • the total of (1) designated device for UV radiation curing has a common housing (2) with a flat, arranged on the bottom outlet opening (3) for the electromagnetic radiation.
  • the electromagnetic radiation emerging from the outlet opening (3) impinges on an object arranged below it at a distance of approximately 30 to 100 mm, in particular one below the device passing substrate web with a large irradiation width (B) of up to 6 m, which extends in the direction of the longitudinal axis L of the elongate device (1).
  • the direction of movement of the substrate web moved under the device (1) runs perpendicular to the irradiation width (B).
  • Each of the four radiation sources (4) has electrodes (5 a, b) on its two end faces.
  • the radiation sources (4) are arranged one behind the other in the direction of the longitudinal axis of the housing (2) and in each case offset relative to the longitudinal axis (L).
  • the offset of two adjacent radiation sources (4) is different insofar as one radiation source (4) to the left of the longitudinal axis and the other radiation source (4) to the right of the longitudinal axis, but offset by the same amount to each other, without the Touch electrodes (5 a, b) of neighboring radiation sources (4).
  • the electrodes (5 a, b) of adjacent radiation sources (4) in each case far enough against each other in the longitudinal direction, that located between the electrodes (5 a, b) of each radiation source (4) glass body of the radiation sources (4), over which the electromagnetic radiation is radiated, string together in the direction of the longitudinal axis (L) over the entire radiation width (B).
  • the overlap in the direction of the longitudinal axis (L) is chosen such that the glass bulbs of adjacent radiation sources do not overlap, thereby resulting in an increased radiation intensity in the overlapping region.
  • each radiation source (4) can be supplied individually with energy so that, depending on the irradiation task, individual irradiation sources (4) can be switched off, in particular if smaller irradiation widths B are to be covered with the irradiation apparatus (1).

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
EP08104441A 2007-06-22 2008-06-17 Dispositif de durcissement par rayonnement UV Withdrawn EP2113309A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007029316A DE102007029316B4 (de) 2007-06-22 2007-06-22 Vorrichtung zum UV-Strahlungshärten

Publications (1)

Publication Number Publication Date
EP2113309A1 true EP2113309A1 (fr) 2009-11-04

Family

ID=39956144

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08104441A Withdrawn EP2113309A1 (fr) 2007-06-22 2008-06-17 Dispositif de durcissement par rayonnement UV

Country Status (2)

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EP (1) EP2113309A1 (fr)
DE (1) DE102007029316B4 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008058327B4 (de) * 2008-11-20 2012-10-18 Daimler Ag Vorrichtung zum Bestrahlen eines Körpers mit elektromagnetischer Strahlung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004788A1 (fr) * 1978-04-11 1979-10-17 Uniroyal Limited Appareil pour irradier une surface allongée
US4276479A (en) * 1974-04-01 1981-06-30 Japan Storage Battery Co., Ltd. Apparatus for curing photo-curable composition
DE4419852A1 (de) * 1994-06-07 1995-12-14 Eltosch Torsten Schmidt Gmbh Vorrichtung zum Herstellen von beschichteten Bahnen, insbesondere von Bahnen für Fußbodenbeläge
DE10125770C2 (de) 2001-05-26 2003-06-26 Arccure Technologies Gmbh Bestrahlungsvorrichtung mit langgestreckter Strahlungsquelle und Verfahren zum Betrieb derselben
JP2004247447A (ja) * 2003-02-13 2004-09-02 Dainippon Screen Mfg Co Ltd 処理装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2242259A (en) * 1990-03-22 1991-09-25 Metal Box Plc A lamp assembly
FI114887B (fi) * 1999-10-13 2005-01-14 U Nav Microelectronics Corp Hajaspektrivastaanottimen signaalinhakujärjestelmä

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4276479A (en) * 1974-04-01 1981-06-30 Japan Storage Battery Co., Ltd. Apparatus for curing photo-curable composition
EP0004788A1 (fr) * 1978-04-11 1979-10-17 Uniroyal Limited Appareil pour irradier une surface allongée
AT370555B (de) 1978-04-11 1983-04-11 Uniroyal Ltd Vorrichtung zum bestrahlen von flaechen mit ultraviolettstrahlung
DE4419852A1 (de) * 1994-06-07 1995-12-14 Eltosch Torsten Schmidt Gmbh Vorrichtung zum Herstellen von beschichteten Bahnen, insbesondere von Bahnen für Fußbodenbeläge
DE10125770C2 (de) 2001-05-26 2003-06-26 Arccure Technologies Gmbh Bestrahlungsvorrichtung mit langgestreckter Strahlungsquelle und Verfahren zum Betrieb derselben
JP2004247447A (ja) * 2003-02-13 2004-09-02 Dainippon Screen Mfg Co Ltd 処理装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 200464, Derwent World Patents Index; AN 2004-656074, XP002544242 *

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Publication number Publication date
DE102007029316A1 (de) 2009-01-02
DE102007029316B4 (de) 2011-02-10

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