EP0493691A1 - U.V.-Lichtstrahlungsvorrichtung in Lackieranlagen unter Verwendung von photopolymerisierbaren Farben - Google Patents

U.V.-Lichtstrahlungsvorrichtung in Lackieranlagen unter Verwendung von photopolymerisierbaren Farben Download PDF

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Publication number
EP0493691A1
EP0493691A1 EP91120664A EP91120664A EP0493691A1 EP 0493691 A1 EP0493691 A1 EP 0493691A1 EP 91120664 A EP91120664 A EP 91120664A EP 91120664 A EP91120664 A EP 91120664A EP 0493691 A1 EP0493691 A1 EP 0493691A1
Authority
EP
European Patent Office
Prior art keywords
irradiation device
lamps
lamp
uviol
mirrors
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.)
Granted
Application number
EP91120664A
Other languages
English (en)
French (fr)
Other versions
EP0493691B1 (de
Inventor
Gianni Raggi
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.)
Cefla SCARL
Original Assignee
Cefla SCARL
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 Cefla SCARL filed Critical Cefla SCARL
Publication of EP0493691A1 publication Critical patent/EP0493691A1/de
Application granted granted Critical
Publication of EP0493691B1 publication Critical patent/EP0493691B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun

Definitions

  • the present invention concerns an ultraviolet light irradiation device, employed in painting plants wherein use is made of photopolymerizable paints.
  • the device of the present invention is meant for continuous painting plants, wherein the objects painted with the photopolymerizable paint undergo a series of drying treatments while they are moved forward on conveyors.
  • the photopolymerizable paints drying cycle comprises, straight after the paint has been applied on the objects, the following succession of steps:
  • this is obtained with a series of low-power tubular lamps, positioned side-by-side, above and transversely to the conveyor along which the objects being treated are moved forward.
  • the luminous emittance of these low-power lamps can in no way be regulated, whereby - in a specific plant - the intensity of the light radiation on the objects being treated and particularly its variabelness, in the forward moving direction of the conveyor, is at present controlled, for what concerns the different working steps, merely by changing the number and/or the position of the lighted lamps.
  • the plant is rather complicated and delicate as it includes a large number of lamps (more than 10 - 20 lamps per meter of conveyor) with the respective electric system. Furthermore - as said above - in a specific plant, the luminous intensity in the forward moving direction of the conveyor can only be regulated by switching off single lamps or groups of lamps, and cannot thus be continuously and homogeneously varied according to the particular requirements of the different paints and/or objects being painted.
  • the object of the present invention is therefore to supply an ultraviolet light irradiation device in the aforespecified plants, wherein the irradiance (intensity of irradiation per surface unit being treated) can be easily and promptly regulated and - in particular - be varied at will along the forward moving direction of the conveyor.
  • Another object of the present invention is to supply an irradiation device apt to work with a very reduced number of lamps, preferably with a single lamp, so as to drastically simplify the electric system.
  • said objects are reached with an ultraviolet light irradiation device - in painting plants using photopolymerizable paints, of the type in which the painted objects are moved forward on conveying means across the irradiation zone - characterized in that it comprises at least one light source, apt to send a beam of uviol rays in a direction substantially parallel to the conveying means, and a plurality of convex mirrors, positioned transversally above said means along a plane which is inclined in respect thereof, apt to fully intercept said beam of uviol rays and reflect it onto the painted objects.
  • the irradiation device of the present invention is mounted above suitable means for conveying painted objects, normally consisting of a slat or roller conveyor 1.
  • the painted objects are positioned on the conveyor 1 in 2 and collected therefrom in 3, after having undergone the gelling treatment by means of the irradiation device of the present invention.
  • the uviol radiation emitted is suitably screened by a framework 4 which covers the whole device.
  • Said device comprises a light source L, apt to send a beam of uviol rays in a direction substantially parallel to the conveyor 1, and a plurality of reflecting mirrors 5, which reflect the radiation from the source L towards the painted objects moving along the conveyor 1.
  • Each mirror 5 consists of a bar having an arc-shaped section, with convexity facing the conveyor 1, and is positioned substantially parallel to the surface of the conveyor and perpendicular to the longitudinal axis thereof.
  • the mirrors 5 are preferably inclined - though keeping parallel to the surface of the conveyor 1 - in respect of the longitudinal axis of said conveyor, alternately on one side and on the other, by a suitable angle, for example between 90° ⁇ 20°.
  • the mirrors 5 are mounted by their ends, preferably in sets, onto a plurality of frames 6, positioned adjacent in front of the light source L and inclined in respect of the underlying surface of the conveyor 1, so as to allow the mirrors 5 to fully intercept the beam of rays emitted by the light source L.
  • the frames 6 are hinged one to the other in correspondence of hingeing points R, and the first and last frame are moreover hinged in C onto the framework 4 of the device. Furthermore, the position of the intermediate hinges R can be adjusted in a vertical direction by means of control handwheels 7. By suitably acting on said handwheels 7, the series of frames 6 can thus be generally positioned according to a straight or broken line, but in any case the mirrors 5 fixed thereto will be fully intercepting the beam of light emitted by the source L.
  • Fig. 2 shows more in detail the light source L. It consists of a high-power tubular lamp 8, positioned in correspondence of the focal line of a cylindrical reflector 10 with parabolic cross section, said focal line being substantially parallel to the surface of the conveyor 1. In this way, the radiations sent by the lamp 8 are deviated into a beam 11 of parallel rays, i.e. the beam of uviol rays substantially parallel to the conveyor 1.
  • the mirrors 5 have an arc-shaped section with convexity facing the conveyor 1, so as to reflect the radiation over a surface 13 which is far wider than that of the mirror; said radiation thereby intersects the radiation of the neighbouring mirrors, finally resulting into a more uniform irradiance on the layer of paint 14 of the objects 15.
  • said arc-shaped section is a parabolic-arc section, designed and oriented so as to improve the homogeneity of the irradiance. It is moreover possible to regulate the irradiance on the conveyor 1 by varying the reciprocal distance between the mirrors 5.
  • the present invention it is also possible to select the emission spectrum of the light source L - so as to adapt it to different types of paint - by replacing the lamp 8 with a lamp 9, already prearranged for the purpose into a suitable housing. Said arrangement is shown more in detail in figs. 4 and 5.
  • the lamps 8 and 9 are mounted on a pair of supports 16, which are in turn fixedly connected to a pair of gears 17, caused to rotate by a pneumatic actuator 18 through a pair of driving gears 19 which are reciprocally connected by a shaft 20.
  • the pneumatic actuator 18 is meant to allow a rotation by exactly 180° in one sense and in the opposite sense.
  • the position of the lamps 8 and 9 - thanks to the fact that the supports 16 rotate about an axis 21 barycentric in respect of said lamps - alternates between a working position, in correspondence of the focal line of the reflector 10, and a rest position close to the bottom of said reflector, where the switched off lamp by no means disturbs the distribution of the reflected radiation.
  • the radiations of the switched on lamp, which hit the switched off lamp, would in fact anyhow not be utilized, as they would in any case be reflected on and intercepted by the switched on lamp.
  • the electric system feeding the irradiation device according to the present invention is obviously far more simplified than that feeding the devices of known technique, seen that a single lamp has to be fed for each conveyor of four to six meters length, instead of the 40 to 120 lamps required in the devices of prior art.
  • a single electric system is provided to feed the lamps 8 and 9, automatically connected to either one of the two circuits of the lamps 8 and 9, only when one of these lamps has to be switched on.
  • the device according to the present invention allows to obtain evident and important advantages. It in fact notably reduces capital and running costs, thanks to the fact that it uses, as light source, a single more powerful lamp to obtain on the painted objects the same irradiance (100-400 mJ/cm2) normally obtained with a plurality of low-power lamps. It provides for many possibilities to regulate the irradiance along the travelling path of the objects being treated, avoiding any dispersion of light radiation and thus keeping constant the overall amount of power fed to the irradiation device. It finally allows to work with two light sources having a different spectrum, by simply rotating the device for selection of the lamps 8 and 9.
  • the present invention has been described with reference to a specific preferred embodiment thereof, but it is evident that its protection also extends to any other embodiments allowing to optimize the essential functions of the device according to the invention, for example by varying the shape and arrangement of the mirrors, the length and number of the mirror frames, the position and number of lamps of the light source, and so on.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Spray Control Apparatus (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Cultivation Of Plants (AREA)
EP91120664A 1990-12-04 1991-12-02 U.V.-Lichtstrahlungsvorrichtung in Lackieranlagen unter Verwendung von photopolymerisierbaren Farben Expired - Lifetime EP0493691B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2222990U 1990-12-04
IT22229U IT220322Z2 (it) 1990-12-04 1990-12-04 Dispositivo di irradiazione di luce uv in impianti di verniciatura utilizzanti vernici fotopolimerizzabili

Publications (2)

Publication Number Publication Date
EP0493691A1 true EP0493691A1 (de) 1992-07-08
EP0493691B1 EP0493691B1 (de) 1995-03-08

Family

ID=11193376

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91120664A Expired - Lifetime EP0493691B1 (de) 1990-12-04 1991-12-02 U.V.-Lichtstrahlungsvorrichtung in Lackieranlagen unter Verwendung von photopolymerisierbaren Farben

Country Status (5)

Country Link
EP (1) EP0493691B1 (de)
AT (1) ATE119660T1 (de)
DE (1) DE69107993T2 (de)
ES (1) ES2070402T3 (de)
IT (1) IT220322Z2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1593919A2 (de) * 2004-04-02 2005-11-09 Firma arccure technologies GmbH Verfahren und Vorrichtung zur Härtung von radikalisch polymerisierbaren Beschichtungen
WO2011054578A1 (de) * 2009-11-04 2011-05-12 Dürr Systems GmbH Vorrichtung zur strahlungsbehandlung einer beschichtung
EP3220717A1 (de) * 2016-03-18 2017-09-20 Hoya Candeo Optronics Corporation Lichtbestrahlungsvorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD8211A3 (de) * 1952-12-07 1954-09-06
GB1209335A (en) * 1968-05-02 1970-10-21 Tools Ltd Nv Drying apparatus
DE2046066A1 (de) * 1969-09-17 1971-03-25 Genvram S A , Paris Mit Infrarotstrahlung betriebener Ofen
DE2639728A1 (de) * 1975-09-11 1977-03-17 Eric Hjalmar Rongren Verfahren und vorrichtung zum behandeln eines substrats mit ultraviolettstrahlung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD8211A3 (de) * 1952-12-07 1954-09-06
GB1209335A (en) * 1968-05-02 1970-10-21 Tools Ltd Nv Drying apparatus
DE2046066A1 (de) * 1969-09-17 1971-03-25 Genvram S A , Paris Mit Infrarotstrahlung betriebener Ofen
DE2639728A1 (de) * 1975-09-11 1977-03-17 Eric Hjalmar Rongren Verfahren und vorrichtung zum behandeln eines substrats mit ultraviolettstrahlung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1593919A2 (de) * 2004-04-02 2005-11-09 Firma arccure technologies GmbH Verfahren und Vorrichtung zur Härtung von radikalisch polymerisierbaren Beschichtungen
EP1593919A3 (de) * 2004-04-02 2006-04-05 Firma arccure technologies GmbH Verfahren und Vorrichtung zur Härtung von radikalisch polymerisierbaren Beschichtungen
WO2011054578A1 (de) * 2009-11-04 2011-05-12 Dürr Systems GmbH Vorrichtung zur strahlungsbehandlung einer beschichtung
EP3220717A1 (de) * 2016-03-18 2017-09-20 Hoya Candeo Optronics Corporation Lichtbestrahlungsvorrichtung
US10012825B2 (en) 2016-03-18 2018-07-03 Hoya Candeo Optronics Corporation Light irradiating device

Also Published As

Publication number Publication date
DE69107993D1 (de) 1995-04-13
IT220322Z2 (it) 1993-09-16
ES2070402T3 (es) 1995-06-01
IT9022229V0 (it) 1990-12-04
ATE119660T1 (de) 1995-03-15
EP0493691B1 (de) 1995-03-08
DE69107993T2 (de) 1995-09-28
IT9022229U1 (it) 1992-06-05

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