EP0656514A1 - Procédé et dispositif de séchage de couches de vernis et d'un matériau de base - Google Patents

Procédé et dispositif de séchage de couches de vernis et d'un matériau de base Download PDF

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Publication number
EP0656514A1
EP0656514A1 EP94890192A EP94890192A EP0656514A1 EP 0656514 A1 EP0656514 A1 EP 0656514A1 EP 94890192 A EP94890192 A EP 94890192A EP 94890192 A EP94890192 A EP 94890192A EP 0656514 A1 EP0656514 A1 EP 0656514A1
Authority
EP
European Patent Office
Prior art keywords
air flow
infrared radiator
infrared
coating
drying
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
EP94890192A
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German (de)
English (en)
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EP0656514B1 (fr
Inventor
Friedrich Ing. Hoffmann
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Individual
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Individual
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Publication date
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Publication of EP0656514A1 publication Critical patent/EP0656514A1/fr
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F26B3/283—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection

Definitions

  • the invention relates to a method having the features of the introductory part of claim 1.
  • water-dilutable coatings such as paint and base material systems
  • blow tunnel for drying painted workpieces in which infrared radiators are combined with blow nozzles.
  • the blow nozzles of the known blow tunnel generate air currents that run parallel to the direction of the infrared radiation, that is to say are oriented approximately perpendicular to the surface of the painted workpiece. It has been shown that such air streams are only of limited suitability for drying water-thinnable lacquer and primer systems, since water vapor is removed only poorly.
  • Increasing the performance of the blowers, which blow air to the blowing nozzles in order to improve the drying performance is not readily possible because strong, perpendicular to the object on which a layer of paint is to be dried, aligned air flows result in undesirable, uneven paint surfaces.
  • the invention is based on the object of developing the method known from EP-A 203 377 in such a way that the drying and / or curing of water-dilutable coating systems, in particular of lacquer and base material, is accelerated and improved essentially without increasing the energy requirement.
  • the invention essentially consists in that the method steps of the characterizing part of claim 1 are carried out.
  • the intensity of the air flow and the intensity of the heat supply via the (or the) infrared radiator is changed independently of one another during drying and / or curing.
  • the procedure is such that after the application of a first layer of the coating, the fan is operated at high power (e.g. the greatest power) and the infrared heater has reduced power.
  • the performance of the fan can be increased to a higher, e.g. increased to its maximum output and the output of the infrared radiator reduced to a fraction of its maximum possible output.
  • the invention provides a device with which the method of the invention can advantageously be carried out.
  • This device for carrying out the method of the invention with the features of the introductory part of claim 8 is characterized according to the invention by the features of the characterizing part of claim 8.
  • the fans or blowers are arranged so that they produce an air flow which is oriented essentially at right angles to the direction of the infrared radiation and which, for example, is about 200 to 300 mm wide and which is separated from the surface of the infrared beam and the object drying and / or curing coating is limited, flows.
  • the air flow causes evaporated water to be removed during the curing and / or drying process by constantly replacing air with high humidity by air with low humidity, which is much more effective compared to EP-A 203 377, since the air flow essentially is aligned parallel to the infrared heater and crosses the space between the object and the infrared heater.
  • the air flow also has the effect that, due to the boundary layer vortices forming on the coating surface, there is an increased release of water molecules into the air flowing past.
  • the coating to be dried is supplied with heat by infrared radiation and, at the same time, water molecules evaporating on the surface of the coating are effectively removed with the air flow.
  • the very narrow processing window that defines the optimal processing conditions for aqueous products between 20 ° C and 26 ° C at 20% relative humidity and 26 ° C to 30 ° C at 75% relative humidity can be considerable with the method and devices according to the invention be expanded.
  • aqueous coating systems can also be processed at ambient temperatures significantly below 22 ° C or at a relative humidity of over 75%.
  • filler material on the one hand should only be applied in a layer thickness of 50 to 60 ⁇ and on the other hand only after a waiting time of 15 min. the drying process should be started (for evaporation).
  • Both layer thicknesses of 50 to 60 ⁇ and the waiting time of 15 min. are unsatisfactory because on the one hand, for example in the case of repaired body parts, three times the layer thickness is necessary to fill unevenness, and on the other hand 15 min. Waiting time disrupt the workflow.
  • the device according to the invention can be equipped with a programmable microprocessor, so that the interaction of heat supply and ventilation, as well as their full or partial output, can be continuously adapted to the requirements and a cooling phase can optionally be carried out at the end of the curing and / or drying.
  • the invention works in such a way that the air flow in the space between the infrared radiator and the object on which a coating to be dried and / or hardened is applied is aligned from top to bottom or horizontally.
  • the diagram shown in FIG. 1 shows, using the example of a two-layer application of filler material with a total thickness of 120 ⁇ , the process sequence for drying and curing according to the method according to the invention.
  • the time in minutes is plotted on the vertical axis and the output in% of the maximum output (100%) is plotted on the horizontal axis of the diagram.
  • the solid line shows the output power of the infrared radiator and the dashed line shows the profile of the output power of the blower (fan), which can have an embodiment according to one of FIGS. 2 to 6.
  • a time period A first elapses in which the first layer of filler material to be dried is applied to the object to be coated.
  • heat is started by the infrared radiator, the output of which is increased to 30% of its maximum output.
  • the blower is switched to maximum output and this output is maintained until the end of the first process section (for example 11 minutes).
  • the infrared heater is switched off after, for example, 8 minutes before the fan is switched off. switched off, so that the output power continuously to about 10% at the time, for example 13 min. sinks.
  • time period A ' for example from 11 to 15 minutes
  • the output of the infrared radiator up to its maximum output increased.
  • the fan is at the time, for example 15 minutes. commissioned, however, only with about 70% of its maximum output.
  • the drying and curing process is finished and both the infrared heater and the blower are switched off.
  • the device shown in Figs. 2 and 3 preferably consists of several, e.g. three, fields 1 of infrared radiators, which can have, for example, the construction known from EP-A 495 770.
  • the infrared radiators 1 have three axial fans 2 on their upper edge in the position of use, which generate a downward air flow.
  • the axial fans 2 are accommodated in separate housings 3 which are fastened to the infrared radiators so as to be pivotable about an axis 4.
  • the infrared radiators 1 can be aligned or adjusted to the contour of the object on which a coating (eg filler or lacquer) on an aqueous basis is to be dried and / or hardened being constructed.
  • a coating eg filler or lacquer
  • the device according to FIG. 2 can also be arranged such that the fans 2 are arranged on one side edge of the infrared radiators 1, so that a horizontally directed air flow is generated.
  • Air filters 9 are used on the air inlet side and on the air outlet side of the housing 3.
  • a blower in the manner of a tangential fan 5 is provided at the upper end of the infrared radiator 1 and is accommodated in a housing 6.
  • An air intake opening covered by a grille 7 is provided on the rear side of the housing 6.
  • the outlet opening 8 of the housing 6 is directed downward and is preferably provided with a filter.
  • a radial fan 10 is provided, which directs air into a channel 11, the outlet opening 12 of which is also directed downward at the front of the infrared radiator 1 and can be equipped with a filter.
  • the air flow between the radiation fields 1 and the object on which a coating is applied can also be generated by ejector nozzles 16 operated with compressed air.
  • ejector nozzles 16 operated with compressed air.
  • FIG. 6 Such an embodiment of a blower 15 is shown in FIG. 6.
  • the brackets for the blowers 15 are attached to the upper edge of infrared radiators 1 so as to be pivotable about an axis 4.
  • a compressed air line 17 opens, which causes a stream of air that emerges from the ejector nozzle 16 essentially parallel to the front of the infrared radiators 1 to be generated.
  • FIGS. 7, 8 and 9 show process sequences which are adapted to different coatings.
  • Fig. 7 shows a diagram with the process for drying and curing a topcoat, which is applied in two layers.
  • FIG. 8 shows the process sequence for a filler layer with a thickness of 180 ⁇ . 8 is a further development of the program of FIG. 1.
  • FIG. 9 shows the process sequence for drying and curing putty filler by the method according to the invention.
  • the air flow is moved past the object to be coated at a higher power than in the second stage after the application of the second coating, whereas the output of the infrared radiator is at the second stage, i.e. the drying and curing of the second layer is higher than in the first stage in the drying and curing of the first layer.
  • the devices according to the invention can have a control in which the most favorable process flow for different coating systems and coating types (in particular the thickness of the coating) is stored, so that the respectively required or desired process flow can be achieved, for example, by pressing a corresponding key or entering a corresponding key figure or a password can be retrieved. This also ensures that the drying and curing are carried out optimally adapted to the regulations of the manufacturer of the coating system.
  • the invention can be represented as follows, for example:

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
  • Manufacturing Of Printed Wiring (AREA)
EP94890192A 1993-12-01 1994-11-22 Procédé et dispositif de séchage de couches de vernis et d'un matériau de base Expired - Lifetime EP0656514B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT2437/93 1993-12-01
AT0243793A AT403518B (de) 1993-12-01 1993-12-01 Verfahren und einrichtung zum trocknen und/oder aushärten von beschichtungen

Publications (2)

Publication Number Publication Date
EP0656514A1 true EP0656514A1 (fr) 1995-06-07
EP0656514B1 EP0656514B1 (fr) 1998-06-17

Family

ID=3534340

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94890192A Expired - Lifetime EP0656514B1 (fr) 1993-12-01 1994-11-22 Procédé et dispositif de séchage de couches de vernis et d'un matériau de base

Country Status (5)

Country Link
US (1) US5623770A (fr)
EP (1) EP0656514B1 (fr)
AT (2) AT403518B (fr)
DE (2) DE9417356U1 (fr)
WO (1) WO1995015471A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19857045A1 (de) * 1998-12-10 2000-06-21 Industrieservis Ges Fuer Innov Beschichtung von Gegenständen
EP2466237A3 (fr) * 2010-12-15 2014-11-05 Heinz-Glas GmbH & Co. KGaA Installation de séchage à infrarouges
DE102015205338A1 (de) * 2015-03-24 2016-09-29 Cefla Deutschland Gmbh Trocknungsvorrichtung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE503423C2 (sv) * 1994-09-09 1996-06-10 Drester Ab Mobil, infraröd färghärdningsanordning
DE10083341D2 (de) * 1999-11-11 2002-12-05 Smart Reflow Gmbh Konvektionsmodul mit pneumatischem Antrieb
DE102005001683B4 (de) * 2005-01-13 2010-01-14 Venjakob Maschinenbau Gmbh & Co. Kg Verfahren und Vorrichtung zum Trocknen von Lackschichten

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB673956A (en) * 1949-03-22 1952-06-18 Baker Perkins Ltd Improvements in and relating to infra-red radiation dryers
US3228113A (en) * 1960-08-18 1966-01-11 John J Fannon Products Co Heating apparatus and method
US3554502A (en) * 1968-05-15 1971-01-12 Goodyear Tire & Rubber Dryer or heater
US4771728A (en) * 1986-09-08 1988-09-20 Bgk Finishing Systems, Inc. Automotive coating treatment apparatus
EP0348882A2 (fr) * 1988-06-29 1990-01-03 Herberts Gesellschaft mit beschränkter Haftung Méthode et appareil pour préparer des échantillons pour le contrôle de qualité de peintures solubles à l'eau
EP0486036A1 (fr) * 1990-11-16 1992-05-20 Setsuo Tate Procédé et dispositif de séchage pour un substrat révêtu
US5263265A (en) * 1989-10-23 1993-11-23 Despatch Industries Convection/radiation material treatment oven

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932114A (en) * 1971-12-13 1976-01-13 Ebert Edward A Device for heating thermoplastic eyeglass frames
US4327665A (en) * 1979-07-26 1982-05-04 Clemens Arrasmith Method and apparatus for coating composition on can seams
DE3515600C1 (de) * 1985-04-30 1986-10-09 Bayerische Motoren Werke AG, 8000 München Blastunnel zum Trocknen von lackierten Werkstuecken
EP0495770B1 (fr) * 1991-01-16 1995-07-12 Friedrich Hoffmann Dispositif de chauffage par rayonnement infra-rouge

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB673956A (en) * 1949-03-22 1952-06-18 Baker Perkins Ltd Improvements in and relating to infra-red radiation dryers
US3228113A (en) * 1960-08-18 1966-01-11 John J Fannon Products Co Heating apparatus and method
US3554502A (en) * 1968-05-15 1971-01-12 Goodyear Tire & Rubber Dryer or heater
US4771728A (en) * 1986-09-08 1988-09-20 Bgk Finishing Systems, Inc. Automotive coating treatment apparatus
EP0348882A2 (fr) * 1988-06-29 1990-01-03 Herberts Gesellschaft mit beschränkter Haftung Méthode et appareil pour préparer des échantillons pour le contrôle de qualité de peintures solubles à l'eau
US5263265A (en) * 1989-10-23 1993-11-23 Despatch Industries Convection/radiation material treatment oven
EP0486036A1 (fr) * 1990-11-16 1992-05-20 Setsuo Tate Procédé et dispositif de séchage pour un substrat révêtu

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19857045A1 (de) * 1998-12-10 2000-06-21 Industrieservis Ges Fuer Innov Beschichtung von Gegenständen
DE19857045C2 (de) * 1998-12-10 2001-02-01 Industrieservis Ges Fuer Innov Beschichtung von Gegenständen
EP2466237A3 (fr) * 2010-12-15 2014-11-05 Heinz-Glas GmbH & Co. KGaA Installation de séchage à infrarouges
DE102015205338A1 (de) * 2015-03-24 2016-09-29 Cefla Deutschland Gmbh Trocknungsvorrichtung
US9841234B2 (en) 2015-03-24 2017-12-12 Cefla Deutschland Gmbh Drying device

Also Published As

Publication number Publication date
EP0656514B1 (fr) 1998-06-17
WO1995015471A1 (fr) 1995-06-08
DE9417356U1 (de) 1995-03-16
DE59406269D1 (de) 1998-07-23
ATE167565T1 (de) 1998-07-15
AT403518B (de) 1998-03-25
ATA243793A (de) 1997-07-15
US5623770A (en) 1997-04-29

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