WO2007134346A1 - Four de traitement thermique avec émetteurs de rayons infrarouges - Google Patents

Four de traitement thermique avec émetteurs de rayons infrarouges Download PDF

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Publication number
WO2007134346A1
WO2007134346A1 PCT/AT2007/000230 AT2007000230W WO2007134346A1 WO 2007134346 A1 WO2007134346 A1 WO 2007134346A1 AT 2007000230 W AT2007000230 W AT 2007000230W WO 2007134346 A1 WO2007134346 A1 WO 2007134346A1
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WO
WIPO (PCT)
Prior art keywords
infrared
conveying
treatment furnace
heat treatment
preferred
Prior art date
Application number
PCT/AT2007/000230
Other languages
German (de)
English (en)
Inventor
Harald SÜSS
Gerald Hemedinger
Thomas Schmidt
Original Assignee
Tigerwerk Lack-Und Farbenfabrik Gmbh & Co. Kg
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 Tigerwerk Lack-Und Farbenfabrik Gmbh & Co. Kg filed Critical Tigerwerk Lack-Und Farbenfabrik Gmbh & Co. Kg
Publication of WO2007134346A1 publication Critical patent/WO2007134346A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
    • F27B9/062—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated electrically heated
    • F27B9/066—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated electrically heated heated by lamps
    • 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
    • F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0006—Electric heating elements or system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0006—Electric heating elements or system
    • F27D2099/0026—Electric heating elements or system with a generator of electromagnetic radiations

Definitions

  • the invention relates to a heat treatment furnace for objects applied to heat- and / or UV-curable coatings with a treatment section with infrared radiators whose emission characteristic has a preferred direction, and a device for conveying the coated objects through the treatment path along a conveying plane in the conveying direction, wherein the preferred directions of at least a portion of the infrared radiators are inclined to the conveying plane and each containing a component which is parallel to the conveying direction.
  • Thermosetting coatings are cured with increasing frequency using infrared radiation, which offers many advantages over the use of convective heat for forced drying / curing.
  • infrared radiation is the preferred or only practicable method in many applications.
  • Heat-sensitive substrates such as wood-based materials, plastics or composite components (for example sandwich constructions, which also have a heat-sensitive core in addition to heat-resistant elements) can be damaged in the course of curing when convective heat is applied before the cross-linking of the coating material is complete.
  • the hardening of coatings by infrared radiation has a high energy-saving potential for solid, in particular the heat-conducting parts: they need for thermal curing of a coating by supplying convection heat for a long time, as sufficient for crosslinking of the coating surface temperature first set, if the parts have a high overall temperature level. After removal from the oven such parts slowly release the heat to the environment, the absorbed energy is lost, since use is often not useful or too expensive.
  • the infrared curing of thermosetting coatings on longitudinal profiles such as steel beams is of great interest.
  • UV irradiation Another substrate-friendly and energy-saving curing technology of coatings is the crosslinking caused by UV irradiation.
  • High-energy UV light triggers via photoinitiators radically or cationically initiated reactions on the appropriately designed binders.
  • the coatings are powder coating compounds, however, heat is also required here for the melting and running / flowing of the material, which heat is then preferably brought to the objects via infrared radiation for the reasons stated above.
  • a trouble-free UV curing of coatings requires the appropriate UV transmission of this coating. This is basically fulfilled with transparent coatings, but only partially with pigmented systems. This is one reason why the application of UV curing of coatings is of significantly less importance than the curing of thermosetting systems caused by IR radiation.
  • Common sources of energy for generating infrared radiation are gas, for example natural gas, and electric power.
  • Gas heaters have lower operating costs due to the cheaper energy carrier gas than those powered by electricity, but generally cause higher investment costs.
  • the advantage of the electric IR emitters lies in their fast control behavior, furthermore, because of the higher maximum temperature up to which these emitters can be operated (halogen infrared emitters), especially short-wave IR radiation - so-called NIR - accessible.
  • the gas-powered IR emitters available in the prior art cover the short, medium and long-wave IR range. They are offered in different versions, which affects the wavelength of the emitted radiation and their energy density.
  • the wavelength of the energy maximum is approximately 1.7 ⁇ m, the energy density is approx. 1000 kW / m 2 .
  • the wavelength of the maximum energy is about 2.2 - 2.4 microns, the achievable energy density is between 30 and 250 kW / m 2 .
  • the wavelength of the energy maximum is between approx.
  • Gas-powered IR emitters have in common that the radiation source is flat (eg porous ceramic, metal fleece). Gas-powered IR radiators have a radiation characteristic with preferential direction, wherein the preferred direction is substantially normal to the radiator surface.
  • radiators voltage is generally applied to a metallic incandescent filament - for example made of tungsten - or a carbon fiber ribbon, whereby this conductor reaches a more or less high temperature.
  • a metallic incandescent filament - for example made of tungsten - or a carbon fiber ribbon
  • This conductor reaches a more or less high temperature.
  • the combination of metal coils with halogen makes it possible to achieve very high operating temperatures;
  • the wavelength of the energy maximum is in such halogen lamps in the range of 0.9 to 1.6 microns, the achievable energy density reaches about 150 kW / m 2 , in water-cooled versions up to 1000 kW / m 2 .
  • Carbon emitters have their energy maximum at approx. 2 to 3 ⁇ m wavelength, they allow energy densities up to 150 kW / m 2 .
  • tubular IR radiators there are also plate-shaped, in which there are heating coils in the manner of an electric range on the back of a glass or metal plate. Both the plate-shaped, and the tubular radiator have - optionally with the aid of reflectors - a radiation with directed, writable by a preferred direction character.
  • the piece can in principle be brought into a chamber equipped with radiators and left there until the end of the curing.
  • EP 0 270 548 B1 describes such a heat treatment furnace, which is constructed as a modular system and whose insides are at least partially provided with reflective material and with a plurality of infrared radiation tubes in concentric arrangement.
  • the oven is also equipped with an optional heated air circulation system, which allows the proportion of convection heat generated by the radiators to be distributed more evenly within this heat treatment furnace.
  • the passage can be made through such a hardening section - lying on a conveyor belt.
  • the parts attached to hangers are driven through an alley, which is lined on both sides of the conveyor line of emitters.
  • No. 2004/0234919 A1 describes a hardening section which can be moved through by hanging, provided with coating powder and which is equipped with gas-catalytic IR radiators whose radiation takes place in a preferred direction.
  • In the inlet and outlet areas of the chamber are vertically arranged, inclined to the conveying direction emitters, which point into the interior of the chamber and emit their radiation both to the direction of conveyance vertically oriented frontal narrow surfaces as well as to the wide surfaces.
  • the chamber in the ceiling area in the chamber interior pointing radiator elements which are parallel to the conveying direction and the vertical inclination of about 30 to 50 °, preferably 45 °, have (pent roof arrangement) and which irradiate the overhead narrow surface as well as the wide surfaces .
  • radiators arranged at the bottom in a mirror image are attached, which irradiate the narrow surface underneath as well as the broad surfaces.
  • WO 02 / 016139A1 discloses a dryer for printed material of two-dimensional extent, such as paper, foil and the like, which is conveyed by means of rollers through the drying section.
  • the drying section comprises a plurality of elongated infrared lamps, which are arranged in a plane parallel to the conveying plane above the continuous web.
  • the longitudinal axes of the infrared lamps have no exact right-angled orientation to the conveying direction, but a slight deviation thereof.
  • this publication contains no teaching.
  • the arrows shown in FIGS. 1, 2 and 12, which point from the dryer head 36 in the direction of the continuous web, are perpendicular to the conveying plane and contain neither a component which is parallel to the conveying direction, nor a component which is inclined to the conveying direction ,
  • US 2004/0226462 A1 discloses a UV heat treatment system for printing units of two-dimensional extent.
  • the elongated heating lamps are in turn arranged in a plane parallel to the conveying plane. From a preferred direction of the heating lamps is as little talk as in the aforementioned document.
  • the arrows shown in Fig. 1 which are directed from the heater unit to the web to be dried, the same considerations apply as in WO 02 / 016139A1.
  • EP 0 870 613 A1 discloses a dryer for printed material of two-dimensional extent with a multiplicity of elongated heating lamps, which are in turn arranged in a plane parallel to the conveying plane and whose longitudinal axes are oblique to the conveying direction. In addition to this, out parallel to the Heating lamps extending pipes through air outlet holes directed air to the printed substrate. With regard to a preferred direction, this document contains no teaching.
  • JP 11-248348 discloses a heat treatment furnace having a plurality of infrared heaters disposed on the side walls of a treatment line.
  • the preferred directions in which the infrared heaters radiate are located exclusively in the conveying plane.
  • the preferred directions are not inclined to the conveying plane, whereby not all sides of the object are reached and consequently leave the irradiation successes in terms of quality and homogeneity to be desired.
  • the narrow surfaces which are oriented longitudinally to the conveying direction, serve either parallel to it, equipped with reflectors and pointing into the plant interior emitters or mirrors, which direct the impact on them from above radiation to these narrow surfaces.
  • these spotlights or mirrors can be adjusted perpendicular to the conveying direction.
  • Direction arranged arranged down-facing radiator has a streaky temperature profile on the wide surface of the plate has the consequence, which can give their Aushärteprofil a corresponding disadvantageous character.
  • the object of the invention is to provide an arrangement of infrared radiators and corresponding devices, with which it is possible to expose three-dimensional articles with predominantly planar or linear expansion provided with said coatings easily, efficiently and in a reliable manner on all sides to a comparable intensity of infrared radiation that the invention molten or to be hardened coatings can be optimally crosslinked on all object surfaces without locally or thermally overloading them or the substrate and thus to damage.
  • the conveying plane which is always oriented parallel to the conveying direction, is determined by the type and geometry of the conveyor. For example, in the case of a conveyor belt, the conveying plane coincides with the surface of the conveyor belt. In a hanging chain-like conveyor the conveying plane is clamped by the hanger or the hanging ropes, chains, hooks and the conveying direction. In the case of several attack points of the hanger at the object spanning a plane, this plane can be defined as a conveying plane.
  • a conveying plane may in special cases also be a plane inclined to the vertical or horizontal plane, for example if the points of application of the object lie in this plane.
  • the preferential directions are oblique both in relation to the conveying direction and with respect to the normal of the panel plane.
  • an infrared emitter in which the emitted IR rays are concentrated in an angular range about a preferred direction or extend substantially parallel to this direction.
  • These can be either infrared sources, which already have a bundled emission characteristic due to their nature and shape, as well as infrared sources with unbounded emission. Beam characteristic, however, with reflectors, mirrors, diaphragms and the like. are provided and their radiation thereby also obtained characterized by a preferred direction characteristic.
  • the former include, for example, gas-catalytic HR radiators with a planar shape.
  • reflectors are additionally necessary to achieve a preferred direction.
  • the infrared radiators are attached to one or more panels extending substantially parallel to the direction of conveyance.
  • the panels are each oriented parallel to the main planes of the objects to be coated.
  • the infrared radiators are arranged along longitudinal axes which are mutually inclined substantially parallel to the conveying direction.
  • the infrared radiators comprise tubular infrared sources and reflectors extending essentially parallel to them.
  • the elongate infrared radiators are substantially parallel to one another within a panel and enclose an angle with the conveying direction which is between 20 ° and 70 °. Preferably, this angle is between 30 ° and 60 °, more preferably between 40 ° and 50 °.
  • the infrared radiators are tilted alternately obliquely forward or obliquely behind, with their deflections from the normal direction to the panel plane or to the main plane of the objects an angle of about 55 ⁇ 30 °, preferably ⁇ 15 °, more preferably ⁇ 5 °.
  • a concrete embodiment of the radiator configuration according to the invention for uniformly uniform curing of coating material applied to all sides on plates, which are conveyed suspended by a hardening section, can thus be as follows:
  • infrared emitters are to be understood as meaning an IR radiation-emitting infrared source, if appropriate with an associated reflector.
  • the emission characteristic obtains a preferred direction around which the emitted IR rays are concentrated in an angular range.
  • the longitudinal axes of the individual radiator units are parallel to one another, wherein they are inclined according to the invention to the conveying direction, preferably by about 45 °, in the concrete case so from top to bottom to the top.
  • the individual radiator units actually their preferred directions, from the direction of the normal distance to the plate plane alternately by about 55 ° obliquely forward - and thus in this specific embodiment also upwards (thus thus obliquely towards the entrance of the heat treatment furnace) - or by about 55 ° obliquely backwards - and thus in this specific embodiment also downwards (thus thus obliquely towards the output of the heat treatment furnace) - rotated.
  • the two wide surfaces as well as the narrow surface and the lower narrow surface, viewed in the conveying direction, are first irradiated by the obliquely forward / upward oriented radiator units.
  • the plate now gets into the effective range of the rear / bottom oriented radiator units, again the two wide surfaces and now the upper narrow surface and - if already occurred in the curing section - are irradiated in the conveying direction end face behind narrow surface.
  • the above concept for the orientation of the infrared emitter units thus provides that the left radiator panel permanently emits radiation to the left wide area, but only reaches the narrow areas in pairs alternately.
  • the right radiator panel in turn, emits radiation to the right wide area and irradiates the narrow areas alternately in pairs, also alternately from the left radiator panel.
  • This ensures that plate-shaped bodies and also three-dimensional dimensional articles with predominantly linear expansion are exposed on all sides to the same infrared radiation effect, which is an essential prerequisite for uniformly heating coatings on such objects on all sides, ie not overheating at individual points under damage to the coating and / or substrate ( burn) at individual points to burn (with the result that the coating is locally burned insufficient).
  • radiator elements instead of orienting the radiator elements, as described above, in the heating panels from the front / bottom to the rear / top, of course, according to the invention, it is equally possible to reverse the direction from front / top to back / down.
  • radiators in the two heating panels so that the radiators are not in pairs opposite each other, but are virtually on "gap" or offset from each other, so that when a radiator of the left The right-hand radiator comes to this surface element only when the left-hand heating element has just a performance minimum, and vice versa.
  • radiator units in a further, preferred embodiment of the invention with regard to the alternately rotated radiator units, it is possible to counteract an orientation of the radiator units in the left-hand heating panel which is turned to the front, to rotate backwards the orientation of the corresponding radiator unit in the right-hand heating panel, or vice versa.
  • By such a radiator arrangement results in a simultaneous irradiation of all narrow surfaces with the advantage of a temporally very homogeneous radiation intensity at these.
  • the longitudinal axes of the radiator units in the two heating panels are rotated by 90 ° from each other, which, like the aforementioned arrangement leads to a particular temporal uniformity of the radiation intensity at all narrow surfaces.
  • all the IR radiators of one panel have a common preferred direction, while all the IR radiators of the other panel also have a common preferred direction.
  • the two preferred directions of the two panels can now be oriented in such a way that they face each other in parallel but in opposite directions.
  • a cuboid object can be treated with its one surface parallel to the conveying plane and its other surfaces normal to the conveying direction oriented with IR rays coming from only two preferred directions. From this embodiment, it is particularly clear that the design complexity, the number of IR emitters or panels can be minimized with the inventive measure.
  • the plate-shaped objects are to be provided with a coating to be treated by infrared radiation only on one of their wide surfaces and on all narrow surfaces, one of the two heating panels can be dispensed with.
  • the narrow surfaces of the plate-shaped body can receive sufficient radiation intensity, it is recommended here, the radiator units in favor of the side surfaces oblique to the coated wide area (which is permanently irradiated anyway), so that they of the individual radiator units less energy intensity than the Narrow surfaces receives, and compensate for the lower energy input by a higher radiator output of a heating panel or a lower conveying speed (longer residence time) of the plates.
  • a horizontal is possible in addition to the vertical arrangement of the heating panel.
  • radiator arrangements or devices according to the invention allow a simple adaptation to the different heat requirements of the different surfaces by adapting the inclination of the radiator units to the object to be coated.
  • an IR emitter arrangement according to the invention (one or more parts) to be followed by a UV curing unit, which represents an effective arrangement for processing UV-curable powder coatings.
  • the erfmdungssiee arrangement of infrared emitters and the corresponding devices are not only suitable for melting and / or curing of coatings on simple rectangular plates or longitudinal profiles: it can of course also be processed blanks with other than rectangular or square shape. As well as closed objects can be processed even those with openings, such as frames or plates with recesses, whether they are continuous or not. It should be mentioned that there are numerous reflector geometries in the prior art - for example, polygonal, parabolic or ellipsoidal cross sections - which should be taken into account in the realization of the infrared emitter array according to the invention and which, used with advantage, can be used to provide the Benefits, which the concept offers, make the best possible use of.
  • the continuous inclination, preferably 45 ° orientation of the radiators to the conveying direction of the parts to be treated reliably prevents the fact that intensity differences of the radiation field manifest as heating differences (eg banding) in the treated parts.
  • FIG. 1 shows the arrangement of infrared radiators on a Walkerpaneel invention
  • Fig. 2 is a sectional view taken along AB of FIG. 1
  • FIG. 4 a schematic representation of the arrangement of two heating panels in a heat treatment furnace according to the invention in the conveying direction
  • FIG. 5 preferred directions according to the prior art
  • FIG. FIGS. 6 and 7 variants of preferred directions according to the invention in different
  • FIG. 8 shows the normal projections of the preferred directions in the conveying plane.
  • Fig. 1 shows a coated object 4, which is conveyed along the conveying direction 5 through the treatment section of a heat treatment furnace according to the invention.
  • the conveying plane is designated, along which the object to be treated is conveyed below the Schupaneels through the oven.
  • a heating panel 1 which is substantially parallel to the conveyor plane 8 and on the elongated infrared radiator 2, T are arranged.
  • the outer contour of Schupaneels 1 is shown only by dashed lines.
  • the oblong-form infrared emitters 2, 2 ' are each composed of a tubular infrared source 12 and a reflector 13 associated with the infrared source, which likewise extends in the longitudinal direction of the infrared source (FIG. 2).
  • the reflector 13 By the reflector 13, the light emitted by the infrared source light is focused to a predetermined restricted angle range.
  • the bundling of the infrared rays into an angular range results in each case in a preferred direction 6, 6 'for an infrared radiator unit, as shown schematically in FIG. 2.
  • other types of IR emitters for example planar ones, have a preferred direction and can therefore also be used.
  • the longitudinal axes 11 of the infrared sources are oriented substantially parallel to one another.
  • the longitudinal axes 11 of the infrared sources or infrared radiator units are now inclined at an angle ⁇ to the conveying direction 5.
  • the angle ⁇ is in the range between 20 ° and 70 °, preferably between 30 ° and 60 °, particularly preferably between 40 ° and 50 °. In the illustrated embodiment, this angle is about 45 °.
  • Fig. 1 also shows the normal projections 16, 16 'of the preferred directions 6, 6' in the panel plane. For the sake of clarity, the preferred directions 6, 6 'are shown by way of example and not for each IR emitter.
  • the normal projections 16, 16 ' (ie the projection takes place along a straight line which is normal to the plane) of the preferred directions 6, 6' are inclined in the panel plane to the conveying direction 5.
  • the normal projections 16, 16 ' are substantially parallel to each other.
  • the angle ⁇ which include the preferred directions projected in the panel plane with the conveying direction 5, is in the range between 20 ° and 70 °, preferably between 30 ° and 60 °, particularly preferably between 40 ° and 50 °. In the illustrated embodiment, in which this angle is 45 °, the angle ⁇ is consequently equal to the angle ⁇ .
  • FIG. 1 represents a preferred embodiment, however, the arrangement of the infrared radiators respectively along lines 11 is not mandatory. Rather, it depends on the orientation of the preferred directions 6, 6 'in the room.
  • FIG. 2 shows a sectional view along the section A-B according to FIG. 1, which runs normal to the longitudinal axis 11 of the infrared radiator. From Fig. 2 it can be seen that the preferred directions 6 and 6 'of the infrared radiator to the normal 7 on the panel surface (the normal 7 is in the illustrated embodiment, a normal to the conveying plane) are inclined. Two groups of infrared emitters are provided, one group consisting of infrared emitters 2 whose preferential direction 6 contains a component which points in the conveying direction 5 and the other group consists of infrared emitters 2 'whose preferred direction 6' contains a component which faces the conveying direction 5.
  • the preferred directions 6, 6 ' with the normal to the panel surface in each case an angle ß or ß', preferably between 25 ° and 85 °, more preferably between 40 ° and 70 °, most preferably between 50 ° and 60 °, for example at 55 °. It is not absolutely necessary derlich that the two angles ß and ß 'are equal. Depending on the geometry of the object to be treated, these can also be different.
  • Fig. 3 shows an embodiment of a heat treatment furnace according to the invention, in which the conveying plane 8 is a horizontal plane and the object to be treated 4 is conveyed on a conveyor belt 9 below the panel 1 through the oven.
  • FIG. 4 shows a further embodiment of a heat treatment furnace in which the object to be treated is suspended on a hanger 10, for example ropes, chains, hooks or the like, and guided along a vertical conveying plane 8 through the treatment section.
  • a hanger 10 for example ropes, chains, hooks or the like
  • Each side of the object to be treated a Schupaneel 1 is arranged substantially parallel to the conveying plane 8.
  • the orientation of the preferred directions does not necessarily depend on the position of the plane of the plane or an arrangement of the IR radiators on a panel, but on how the IR rays strike the objects to be coated, the embodiment described above will be described below generalized.
  • the preferred directions are made in relation to the conveying direction and the conveying plane.
  • the conveying plane which is understandably oriented parallel to the conveying direction, is essentially defined by the type and geometry of the conveying device.
  • the conveyor plane 8 corresponds to the support surface of the conveyor belt 9.
  • the conveyor plane 8 is vertically oriented and parallel to the ropes of the hanger.
  • the conveying plane may also be a plane inclined to the vertical plane containing the conveying direction. A definition of the conveying plane can then take place via the suspension points or contact points between the conveyor and the object to be treated.
  • the heating panel 1 is substantially parallel to the conveying plane 8 (FIG. 2). This is particularly advantageous when plate-shaped objects are subjected to the heat treatment. In the case of objects deviating in shape, for example with inclined surfaces to the conveying plane, the heating panels can also be oriented differently than parallel to the conveying plane.
  • the preferred directions In order to be able to irradiate an object moved along the conveying plane uniformly and as possible from all sides, the preferred directions now contain a component that is parallel to the conveying direction. There is thus also an irradiation of the front and / or the rear end faces of the object.
  • the preferred directions according to the invention have the following property: In the case of a normal projection of the preferred directions 6, 6 'into the conveying plane 8, the projections are inclined to the conveying direction 5. This characteristic of the preferred directions can be seen in FIG. 8:
  • the conveying plane 8 is shown in plan view.
  • the normal projections 16, 16 'of the preferred directions 6, 6' are shown. With ⁇ or ⁇ 'is that angle which includes a normal projection with the conveying direction 5. In the example shown, all angles ⁇ , ⁇ 'are the same and are 45 °. In principle, however, the individual normal projections 16, 16 'may include different angles with the conveying direction 5.
  • a cube in which two opposite surfaces are normal to the conveying direction 5 and two other opposing surfaces are parallel to the conveying plane 8, is irradiated by the inventive orientation of the preferred directions so that three surfaces of the cube are achieved simultaneously with a single preferred direction.
  • a preferred direction is given, which is oriented parallel to the spatial diagonal of the cube. With another preferred direction, which comes from exactly opposite direction, all 6 surfaces of the cube can be irradiated.
  • the normal projections of the preferred directions 6, 6 'in the conveying plane 8 are substantially parallel to each other.
  • the preferred direction 6 of a group of infrared emitters 2 comprises a component facing in the conveying direction 5
  • the preferred direction 6 'of another group of infrared emitters 2' comprises a component facing the conveying direction 5
  • one infrared emitter 2 of the one group is arranged next to an infrared emitter 2 'of the other group.
  • conveying direction 5 between 20 ° and 70 °, preferably between 30 ° and 60 °, particularly preferably between 40 ° and 50 °.
  • the angle ⁇ , ⁇ ' which include the preferred directions 6, 6' with the normal 7 on the conveying plane, is between 25 ° and 85 °, more preferably between 40 ° and 70 °, most preferably between 50 ° and 60 °.
  • the infrared radiators of different heating panels do not have to have the same orientation.
  • the longitudinal axes of the infrared sources on the one panel are inclined by about 90 ° to the longitudinal axes of the infrared sources on the other panel. It would also be conceivable to arrange the infrared sources of both panels parallel to each other, but in each case offset from one another.
  • the invention is not limited to the illustrated embodiment, but contains innumerable variants.
  • the radiator units do not have to be in one continuous extend from one end of the Schupaneels to the other, but can each be formed by juxtaposing shorter trained infrared emitters.
  • the reflectors do not necessarily have to be designed continuously.
  • the invention has been described in terms of elongated and tubular infrared sources, but infrared sources of other shapes may also be used, for example of a more planar nature, such as in gas-powered IR sources. These would then be arranged next to each other along a straight line or longitudinal axis.
  • the individual infrared radiators are pivotable with respect to the Bankpaneel 1, and that about an axis which extends parallel to the longitudinal axis 11.
  • the angles ⁇ , ⁇ 'to the normal 7 can be changed and thereby the angle of incidence on the object.
  • This can be done for example via a controller that interacts with individual stepper motors that pivot the infrared emitters.
  • the pivoting can be done individually for each emitter or each act on a pair of emitters. As shown in Fig. 2, such a pair of radiators consists of a radiator 2 and a radiator 2 '.
  • FIGS. 5 to 7 each contain a Cartesian coordinate system in which two preferred directions 6, 6 'are drawn.
  • the coordinate system is set so that the z-axis coincides with the conveying direction 5.
  • Fig. 5 shows two preferred directions 6, 6 'according to the prior art. Only for the sake of simplicity, they have been shown as a pair of pointers, of course, the preferred directions 6, 6 'do not emanate from the same point, they can be moved in parallel in any way.
  • the preferred directions 6, 6 'each have a grain component, which is parallel to the conveying direction 5.
  • a further feature of this orientation of the preferred directions, which can be assigned to the prior art, is that a plane containing the conveying direction 5 exists, for which the following applies: In the case of a normal projection of the preferred directions 6, 6 'into this plane (ie, a projection along one on the Plane normal standing line 15) are the projections 16, 16 'parallel to the conveying direction 5. In the illustrated case, this level would be the xz plane.
  • Fig. 6 shows the orientation of two preferred directions 6, 6 'according to the invention.
  • the preferred direction 6 has a component which points in the conveying direction 5, ie in the z-direction, a component which points in the x-direction and a component which points in the negative y-direction.
  • the preferred direction 6 ' has a component which, opposite to the conveying direction 5, that is to say in the negative z-direction, has a component which points in the negative x-direction and a component which points in the negative y-direction.
  • the normal projections 16 and 16 'in the xz plane are inclined to the conveying direction 5.
  • FIG. 7 shows the same orientation of the preferred directions as FIG. 6, but now the preferred directions 6, 6 'are projected into another plane E inclined to the xz plane, which, however, also contains the conveying direction 5.
  • the normal projection 16 of a preferred direction 6 is parallel to the conveying direction 5 (or z axis)
  • the normal projection 16 'of the other preferred direction 6' is inclined to the conveying direction 5.
  • the above variants of the invention are therefore characterized by the feature that on the one hand the preferred directions of at least a portion of the infrared emitters each contain a component that is parallel to the conveying direction, and on the other hand, that in a normal projection of the preferred directions 6, 6 ', the contain a component parallel to the conveying direction 5, in any, the conveying direction 5 containing plane is always at least a portion of the projections to the conveying direction 5 inclined.
  • This formulation includes that in addition to or in addition to the IR emitters according to the invention, IR emitters may also be provided which do not fulfill the above conditions. Such a formulation is also independent of the funding level.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Drying Of Solid Materials (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

La présente invention concerne un four de traitement thermique pour revêtements thermodurcissables et/ou durcissables aux ultraviolets appliqués sur des objets. Le four est doté d'une zone de traitement avec des émetteurs de rayons infrarouges, dont la caractéristique d'émission présente une direction préférentielle, et d'un dispositif de transport des objets revêtus dans la zone de traitement le long d'un plan de transport dans la direction de transport, les directions préférentielles d'au moins une partie des émetteurs de rayons infrarouges étant inclinées vers le plan de transport et contenant respectivement une composante qui est parallèle à la direction de transport. Pour obtenir un rayonnement plus homogène, les projections normales d'au moins une partie des directions préférentielles (6, 6') qui contiennent une composante parallèle à la direction de transport (5), sont inclinées dans le plan de transport (8) vers la direction de transport (5). De préférence, l'angle qui inclut les projections normales de ladite partie des directions préférentielles dans le plan de transport avec la direction de transport se situe entre 20° et 70°, et l'angle qui inclut ladite partie des directions préférentielles avec les projections normales sur le plan de transport se situe entre 25° et 85°. Les émetteurs de rayons infrarouges peuvent en outre être disposés en groupes sur un panneau orienté.
PCT/AT2007/000230 2006-05-19 2007-05-11 Four de traitement thermique avec émetteurs de rayons infrarouges WO2007134346A1 (fr)

Applications Claiming Priority (2)

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ATA879/2006 2006-05-19
AT8792006A AT502830B1 (de) 2006-05-19 2006-05-19 Wärmebehandlungsofen

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WO2007134346A1 true WO2007134346A1 (fr) 2007-11-29

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AT (1) AT502830B1 (fr)
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DE102011104521B4 (de) * 2011-06-17 2013-02-07 Belte Ag Vorrichtung und verfahren zur wärmebehandlung
DE102017011881A1 (de) * 2017-12-21 2019-06-27 Gunther Ackermann Vorrichtung zur Bestrahlung eines Gegenstandes

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DE4302976A1 (de) * 1992-07-22 1994-01-27 Bosch Gmbh Robert Vorrichtung und Verfahren zum Auflöten von Bauelementen auf Platinen
JPH11248348A (ja) * 1998-02-26 1999-09-14 Ngk Insulators Ltd 遠赤外ヒータ炉
US20040234919A1 (en) * 2003-05-21 2004-11-25 Mdf Powder Coat Systems L.L.C. Method and apparatus for heating and curing powder coatings on porous wood products
EP1563916A2 (fr) * 2004-01-22 2005-08-17 MILLER, William Peter Appareil et procédure d'application de revêtement en poudre au substrat à base de bois à l'aide de la radiation infrarouge

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US6877247B1 (en) * 2000-08-25 2005-04-12 Demoore Howard W. Power saving automatic zoned dryer apparatus and method
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DE4302976A1 (de) * 1992-07-22 1994-01-27 Bosch Gmbh Robert Vorrichtung und Verfahren zum Auflöten von Bauelementen auf Platinen
US5515605A (en) * 1992-07-22 1996-05-14 Robert Bosch Gmbh Apparatus and process for soldering component onto boards
JPH11248348A (ja) * 1998-02-26 1999-09-14 Ngk Insulators Ltd 遠赤外ヒータ炉
US20040234919A1 (en) * 2003-05-21 2004-11-25 Mdf Powder Coat Systems L.L.C. Method and apparatus for heating and curing powder coatings on porous wood products
EP1563916A2 (fr) * 2004-01-22 2005-08-17 MILLER, William Peter Appareil et procédure d'application de revêtement en poudre au substrat à base de bois à l'aide de la radiation infrarouge

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CN108302922A (zh) * 2018-03-26 2018-07-20 廊坊京磁精密材料有限公司 磁性材料加热烘干装置及其方法

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AT502830A4 (de) 2007-06-15

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