EP3073215B1 - Drying device - Google Patents

Drying device Download PDF

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Publication number
EP3073215B1
EP3073215B1 EP16161250.2A EP16161250A EP3073215B1 EP 3073215 B1 EP3073215 B1 EP 3073215B1 EP 16161250 A EP16161250 A EP 16161250A EP 3073215 B1 EP3073215 B1 EP 3073215B1
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EP
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Prior art keywords
drying
workpiece
zone
chamber
drying device
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EP16161250.2A
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German (de)
French (fr)
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EP3073215A1 (en
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Cefla Deutschland GmbH
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Cefla Deutschland GmbH
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Priority to PL16161250T priority Critical patent/PL3073215T3/en
Publication of EP3073215A1 publication Critical patent/EP3073215A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
    • F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
    • 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
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/04—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour circulating over or surrounding the materials or objects to be dried
    • 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
    • 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

Definitions

  • the invention relates to a drying device for drying elongated workpieces coated in particular with paint, lacquer or the like in a continuous process.
  • Elongated workpieces in particular made of wood or plastic, are at least partially coated, for example after producing a profile. Coating is carried out here by a continuous process in which the workpiece is moved, for example, through a chamber in which, for example, all surfaces, only individual edges, etc. are coated in particular with paint, varnish or the like.
  • a device for coating elongated workpieces in a continuous process is, for example, in EP 10 162 699 and EP 11 174 355 described.
  • Drying must take place immediately after coating, in particular an edge of an elongated workpiece.
  • a drying device immediately after the coating device.
  • the workpiece is also transported through the drying device in a continuous process.
  • the drying removes more than 90%, preferably more than 92%, of the water in the coating material.
  • the elongated workpieces, in particular the glass-rock wool panels, can only be packed if the proportion of water is reduced, otherwise condensate will form.
  • US 2008/0099459 A1 describes a drying device for workpieces coated with paint. The drying takes place within a longitudinal, radially completely closed drying oven.
  • DE 38 17 972 A1 describes a method and an apparatus for drying perforated brick blanks.
  • the perforated brick blanks are moved in a stacked manner on a transport device through a drying channel that is open at the bottom.
  • DE 196 28 831 A1 describes a laboratory dryer, in which the material to be dried is moved through a drying channel by means of a conveyor belt.
  • WO 00/72980 A2 describes a drying process, where entire vehicle bodies are guided through a drying channel in the longitudinal pass.
  • the object of the invention is to provide a drying device for drying coated, elongated workpieces in a continuous process, with which drying of the coating can be achieved with short throughput times.
  • the object is achieved by a drying device according to claim 1 and by a method according to claim 14.
  • the drying device according to the invention for drying elongated workpieces coated with paint, lacquer or the like, for example, in a continuous process has a transport device for, in particular, continuous transport of the workpiece.
  • the elongated workpieces are glass rock wool panels as well as wood fiber panels.
  • the workpieces are essentially rectangular Cross section on, whereby individual edges and surfaces can be profiled. Since the drying device is connected in a particularly preferred arrangement directly to a coating device, it is possible to move the workpieces, for example, even with the same transport device first through the coating device and then directly through the drying device.
  • the transport device preferably has a plurality of belts or rollers on which the elongated workpiece lies for transport. If necessary, opposing belts and / or rollers are provided, between which the workpiece is arranged for transport.
  • a heat source for generating drying heat is provided in a drying area.
  • the heat source preferably has at least one, in particular several, infrared lights.
  • the at least one infrared lamp is preferably arranged parallel to the workpiece edge to be dried.
  • an air flow generating device such as a fan is provided in order to at least partially remove this drying steam in the drying area by an air flow.
  • the air flow can be generated by suction and / or blowing. It was also found that this air flow may result in unwanted cooling in the drying area. This reduction in temperature may interfere with drying, so that longer residence times would be required, which would significantly increase the manufacturing time and costs. According to the invention, therefore, there is also a control device for controlling the air flow generating device amount of air supplied to or removed from the dry area.
  • control device can be used to regulate or control the heat source.
  • control device to additionally adapt the air flow as a function of the feed speed of the workpiece to be dried.
  • the control device is preferably used to control the speed of one or more fans of the airflow generating device in order to supply air to the drying area and / or to remove or extract it from the drying area.
  • a module such as a frequency converter is provided for this.
  • the air flow generating device preferably has a supply channel and / or a discharge channel for supplying or removing air or steam to and from the drying area.
  • the feed and / or discharge channel preferably extends in the longitudinal direction of the workpiece or in the transport direction of the workpiece.
  • the feed and / or discharge channel is aligned parallel to the workpiece edge to be dried.
  • the feed and / or discharge channel extends over the entire length of the drying device.
  • Throttle devices of this type can, for example, be located in an outlet opening of the feed channel be arranged.
  • the amount of air supplied to the drying area can be varied.
  • a corresponding throttle device can also be provided in an inlet opening of a discharge duct.
  • the corresponding throttle device for setting the amount of air supplied and / or discharged to the drying area is connected to the control device.
  • the drying area according to the invention is arranged in a drying chamber.
  • the drying chamber which preferably has a substantially U-shaped cross section, is designed such that the part of the workpiece to be dried, such as a workpiece edge, protrudes into the drying chamber.
  • the drying chamber is designed such that it has a slot-shaped opening that extends in the longitudinal or transport direction of the workpiece. Part of the workpiece protrudes into the drying chamber through the opening. The elongated workpiece is transported in the longitudinal direction of the slot. Furthermore, it is preferred that the chamber wall which forms the slot-shaped opening has a heat insulation plate or consists of a heat insulation plate. This has the advantage that the high heat emitted by the heat source is in particular shadowed with respect to the transport device. In a preferred embodiment, this results in the transport device being shadowed with respect to that emitted by the heat source Warmth. This prevents damage to the transport device.
  • the opening has only a slightly greater height than the thickness of the workpiece.
  • the height of the opening is less than 10 mm, in particular less than 6 mm and particularly preferably less than 4 mm greater than the thickness of the workpiece. Essentially, there is no heat from the drying chamber in the direction of the transport device.
  • the transport device is in particular arranged completely outside the drying chamber.
  • the heat source which preferably has a plurality of infrared lights, can be designed such that a plurality of infrared lights or other heat sources surround the workpiece.
  • the heat source is preferably arranged within the drying chamber in such a way that it lies opposite the area of the workpiece to be dried, such as the workpiece edge, and preferably runs parallel to it or extends in the transport direction.
  • a moisture sensor is also provided, in particular in the drying area, which is connected to the control device.
  • One or more moisture sensors can measure the degree of moisture and are preferably provided in the at least one discharge channel.
  • a heating device is provided for heating the air supplied to the drying area. This makes it possible, despite the removal of steam from the drying area, to reduce the resultant lowering of the temperature in the drying area or even to completely avoid lowering it.
  • the drying device With the aid of the drying device according to the invention, it is in particular possible to completely dry layer thicknesses of 500 to 1000 ⁇ m or to achieve thorough drying. This can be done in a continuous process within 20 to 30 seconds.
  • the heat source generates a temperature of 30 ° C - 80 ° C on the surface to be dried. In particular, infrared lights are used as heat sources for this.
  • Medium-wave IR emitters with a wavelength of in particular 3-50 ⁇ m are preferably used as the lamp. These have a surface temperature of 850 ° C - 900 ° C. It is therefore preferred to arrange the emitters at a distance of 3 cm - 4 cm from the area to be dried, in particular to avoid damaging the surface.
  • the feed speed of the elongated workpiece in the drying device is usually at least 20 m / min. However, feed speeds of more than 50 m / min, in particular more than 100 m / min, are also possible. With the help of the drying device according to the invention, reliable and also rapid drying can take place. This is particularly advantageous for economic reasons, since the energy consumption of the lamps from 6 kWh to 12 kWh, possibly even up to 20 kWh, takes place per meter of drying length.
  • a humidification device is provided in the air flow supplied, in particular in the feed duct.
  • This allows the air supplied to the drying area to be humidified.
  • this makes it possible to set the air humidity in the drying area very precisely, so that extremely high quality can be achieved.
  • the humidification device is connected to the control device, so that the humidification device can be regulated in particular as a function of a moisture determined in the drying area by a sensor.
  • the risk of blistering is considerably reduced, particularly in the case of thick layers of, in particular, film-forming lacquers.
  • drying device is immediately followed by a coating device.
  • a coating device as shown in EP 10 162 699 or EP 11 174 355 is described.
  • the figure shows a schematic sectional view of a preferred embodiment of a drying device according to the invention.
  • a transport device in the exemplary embodiment shown has two schematically illustrated transport rollers 10.
  • An elongated workpiece 12, such as a board, is arranged between the two transport rollers 10 and is transported by the transport rollers 10 perpendicular to the plane of the drawing in the direction of an arrow 14.
  • an edge 16 of the workpiece 12 has been coated with lacquer, paint or the like in the coating device upstream of the drying device.
  • the heat source 18 is arranged in a housing 20 of the drying device. In the exemplary embodiment shown, this has a U-shaped cross section, the surface 16 to be dried projecting into the housing 20.
  • the drying heat produces drying steam in a drying area 22 by drying the lacquer or paint.
  • air is supplied to the drying area 22 via a supply channel 24 in the direction of an arrow 26 to remove the drying steam.
  • the feed channel which also extends in the longitudinal direction or transport direction 14, has one or more air flow generating devices such as fans 28.
  • the at least one fan 28 is connected to a control device 30.
  • a heat source 32 can be provided, which is preferably also controllable via the control device.
  • a throttle device 36 can be provided in the region of an outlet opening 34 of the feed channel 24. In the illustrated embodiment, this is shown as a throttle cap which can be pivoted in the direction of an arrow 38.
  • the throttle valve 36 can not only restrict the amount of air supplied, but also deflect it. The position of the throttle valve can in turn preferably be controlled with the aid of the control device.
  • a discharge channel 40 is provided opposite the feed channel 24.
  • the discharge duct 40 is constructed similarly to the feed duct 24 and also has an air flow generating device with, for example, a plurality of fans 42 in order to draw air out of the drying region 22 in the direction of an arrow 44.
  • the particular one A plurality of fans 42 are in turn connected to the control device 30 for regulation.
  • a throttle device 48 such as a throttle valve, which can be pivoted in the direction of an arrow 50, can again be provided in the region of an inlet opening 46 of the discharge duct 40.
  • the position of the throttle device 48 can in turn be controlled via the control device 30.
  • a moisture sensor 52 in the drying area 22. This is in turn connected to the control device 30.
  • an air humidification device 54 is provided in the feed channel 24. This is preferably connected to the control device 30. This can prevent the top layer of a lacquer from drying too quickly. This prevents film formation, so that the water from the paint dries to dry the paint layer.
  • the two chamber walls or heat insulating plates 56 also extend in the longitudinal direction 14 and serve as an aperture.
  • the two chamber walls 56 form an opening 58.
  • the opening 58 has a height H which corresponds to the distance between the two chamber walls 56.
  • the height H is slightly larger than the thickness d of the elongated workpiece 12. In this respect, only a small gap is formed on both sides between the opening 58 and the workpiece 12.
  • a plurality of drying devices are arranged one behind the other. It is possible for each drying device to set or regulate the individual parameters differently with the aid of a corresponding control device. It is of course possible to provide a common control device for the individual drying devices in order to coordinate them.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Drying Of Solid Materials (AREA)

Description

Die Erfindung betrifft eine Trocknungsvorrichtung zur Trocknung von insbesondere mit Farbe, Lack oder dergleichen beschichteten, langgestreckten Werkstücken im Durchlaufverfahren.The invention relates to a drying device for drying elongated workpieces coated in particular with paint, lacquer or the like in a continuous process.

Langgestreckte Werkstücke insbesondere aus Holz oder Kunststoff werden beispielsweise nach Herstellung einer Profilierung zumindest teilweise beschichtet. Das Beschichten erfolgt hierbei durch ein Durchlaufverfahren, bei dem das Werkstück beispielsweise durch eine Kammer bewegt wird, in der beispielsweise sämtliche Oberflächen, nur einzelne Kanten etc. insbesondere mit Farbe, Lack oder Ähnlichem beschichtet werden. Eine derartige Vorrichtung zur Beschichtung langgestreckter Werkstücke im Durchlaufverfahren ist beispielsweise in EP 10 162 699 und EP 11 174 355 beschrieben.Elongated workpieces, in particular made of wood or plastic, are at least partially coated, for example after producing a profile. Coating is carried out here by a continuous process in which the workpiece is moved, for example, through a chamber in which, for example, all surfaces, only individual edges, etc. are coated in particular with paint, varnish or the like. Such a device for coating elongated workpieces in a continuous process is, for example, in EP 10 162 699 and EP 11 174 355 described.

Unmittelbar nach dem Beschichten, insbesondere einer Kante eines langgestreckten Werkstücks muss ein Trocknen erfolgen. Hierzu ist es bekannt, unmittelbar anschließend an die Beschichtungsvorrichtung eine Trocknungsvorrichtung vorzusehen. Das Werkstück wird ebenfalls im Durchlaufverfahren durch die Trocknungsvorrichtung hindurch transportiert. Es ist bekannt die Trocknung mit Hilfe von Wärmequellen wie Infrarotleuchten durchzuführen. Dies ist beispielsweise in EP 1 144 129 beschrieben.Drying must take place immediately after coating, in particular an edge of an elongated workpiece. For this purpose, it is known to provide a drying device immediately after the coating device. The workpiece is also transported through the drying device in a continuous process. It is known to carry out drying using heat sources such as infrared lights. This is for example in EP 1 144 129 described.

Bei derartigen Trocknungsvorrichtungen besteht die Problematik, dass beispielsweise eine Farb- oder Lackschicht nicht vollständig durchtrocknet, sondern eine trockene, dichte Haut, eine sogenannte Filmbildung an der Oberfläche entsteht und darunter feuchte Farbe oder Lack verbleibt. Dies führt beispielsweise zur Blasenbildung im weiteren Trocknungsverlauf. Wird das Produkt zum Beispiel in Folien verpackt, ist das Restwasser aus dem Lack später als Wassertropfen im verpackten Produkt zu sehen. Des Weiteren besteht die Forderung, dass die Durchlaufzeiten gering sind, um die Produktionskosten, insbesondere den Stromverbrauch, gering zu halten. Besonders kritisch ist die Filmbildung bei filmbildenden Lacken mit insbesondere einem hohen Festkörperanteil.The problem with such drying devices is that, for example, a layer of paint or varnish does not dry out completely, but instead a dry, dense skin, a so-called film formation, forms on the surface and moist paint or varnish remains underneath. This leads, for example, to the formation of bubbles in the further course of drying. For example, if the product is packaged in film, the residual water from the paint can later be seen as water drops in the packaged product. Furthermore, there is a requirement that the throughput times are short in order to keep the production costs, in particular the electricity consumption, low. Film formation is particularly critical in the case of film-forming lacquers with, in particular, a high solids content.

Insbesondere besteht die Forderung, dass durch die Trocknung mehr als 90 %, vorzugsweise mehr als 92 % des sich im Beschichtungsmaterial befindenden Wassers entfernt werden. Nur bei entsprechend reduziertem Wasseranteil ist ein Verpacken der langgestreckten Werkstücke, insbesondere der Glas-Steinwolleplatten möglich, da sich ansonsten Kondensat bildet.In particular, there is a requirement that the drying removes more than 90%, preferably more than 92%, of the water in the coating material. The elongated workpieces, in particular the glass-rock wool panels, can only be packed if the proportion of water is reduced, otherwise condensate will form.

US 2008/0099459 A1 beschreibt eine Trocknungsvorrichtung für mit Farbe beschichtete Werkstücke. Die Trocknung erfolgt hierbei innerhalb eines längs verlaufenden, radial vollständig geschlossenen Trocknungsofens. US 2008/0099459 A1 describes a drying device for workpieces coated with paint. The drying takes place within a longitudinal, radially completely closed drying oven.

DE 38 17 972 A1 beschreibt ein Verfahren und eine Vorrichtung zum Trocknen von Lochziegelrohlingen. Die Lochziegelrohlinge werden hierbei gestapelt auf einer Transportvorrichtung durch einen nach unten hin offenen Trocknungskanal bewegt. DE 38 17 972 A1 describes a method and an apparatus for drying perforated brick blanks. The perforated brick blanks are moved in a stacked manner on a transport device through a drying channel that is open at the bottom.

DE 196 28 831 A1 beschreibt einen Labortrockner, wobei das zu trocknende Gut mittels Fließband durch einen Trocknungskanal bewegt wird. DE 196 28 831 A1 describes a laboratory dryer, in which the material to be dried is moved through a drying channel by means of a conveyor belt.

WO 00/72980 A2 beschreibt einen Trocknungsprozess, wobei gesamte Fahrzeugkarosserien im Längsdurchlauf durch einen Trocknungskanal geführt werden. WO 00/72980 A2 describes a drying process, where entire vehicle bodies are guided through a drying channel in the longitudinal pass.

Aufgabe der Erfindung ist es, eine Trocknungsvorrichtung zur Trocknung von beschichteten, langgestreckten Werkstücken im Durchlaufverfahren zu schaffen, mit der ein Durchtrocknen der Beschichtung bei geringen Durchlaufzeiten erzielt werden kann.The object of the invention is to provide a drying device for drying coated, elongated workpieces in a continuous process, with which drying of the coating can be achieved with short throughput times.

Die Lösung der Aufgabe erfolgt durch eine Trocknungsvorrichtung gemäß Anspruch 1 und durch ein Verfahren gemäß Anspruch 14.The object is achieved by a drying device according to claim 1 and by a method according to claim 14.

Die erfindungsgemäße Trocknungsvorrichtung zur Trocknung von beispielsweise mit Farbe, Lack oder dergleichen beschichteten langgestreckten Werkstücken im Durchlaufverfahren weist eine Transportvorrichtung zum insbesondere kontinuierlichen Transport des Werkstücks auf. Insbesondere handelt es sich bei den langgestreckten Werkstücken um Glas-Steinwolleplatten, sowie Holzfaserplatten. Die Werkstücke weisen hierbei im Wesentlichen einen rechteckigen Querschnitt auf, wobei einzelne Kanten und Flächen profiliert sein können. Da die Trocknungsvorrichtung in besonders bevorzugter Anordnung unmittelbar an eine Beschichtungsvorrichtung angeschlossen ist, ist es möglich die Werkstücke beispielsweise sogar mit derselben Transportvorrichtung zunächst durch die Beschichtungsvorrichtung und anschließend unmittelbar durch die Trocknungsvorrichtung zu bewegen. Die Transportvorrichtung weist vorzugsweise mehrere Bänder oder Rollen auf, auf denen das langgestreckte Werkstück zum Transport aufliegt. Gegebenenfalls sind einander gegenüberliegende Bänder und/oder Rollen vorgesehen, zwischen denen das Werkstück zum Transport angeordnet ist.The drying device according to the invention for drying elongated workpieces coated with paint, lacquer or the like, for example, in a continuous process has a transport device for, in particular, continuous transport of the workpiece. In particular, the elongated workpieces are glass rock wool panels as well as wood fiber panels. The workpieces are essentially rectangular Cross section on, whereby individual edges and surfaces can be profiled. Since the drying device is connected in a particularly preferred arrangement directly to a coating device, it is possible to move the workpieces, for example, even with the same transport device first through the coating device and then directly through the drying device. The transport device preferably has a plurality of belts or rollers on which the elongated workpiece lies for transport. If necessary, opposing belts and / or rollers are provided, between which the workpiece is arranged for transport.

Zur Trocknung, insbesondere einer Kante eines beschichteten Werkstücks, ist eine Wärmequelle zur Erzeugung von Trocknungswärme in einem Trocknungsbereich vorgesehen. Die Wärmequelle weist vorzugsweise mindestens eine, insbesondere mehrere Infrarotleuchten auf. Die mindestens eine Infrarotleuchte ist hierbei vorzugsweise parallel zu der zu trocknenden Werkstückkante angeordnet. Untersuchungen haben gezeigt, dass bisweilen ein Durchtrocknen bei kurzen Verweilzeiten nicht erzielt wird, weil sich in dem Trocknungsbereich aufgrund des beim Trocknen der Beschichtung entstehenden Dampfes eine Dampfglocke bildet, die beispielsweise die zu trocknende Werkstückkante im Trocknungsbereich umgibt. Dies führt dazu, dass die weitere Trocknung nachteilig beeinflusst wird.For drying, in particular an edge of a coated workpiece, a heat source for generating drying heat is provided in a drying area. The heat source preferably has at least one, in particular several, infrared lights. The at least one infrared lamp is preferably arranged parallel to the workpiece edge to be dried. Studies have shown that drying through with short dwell times is sometimes not achieved because a steam bell forms in the drying area due to the steam generated when the coating dries, which surrounds, for example, the workpiece edge to be dried in the drying area. This means that further drying is adversely affected.

Erfindungsgemäß ist eine Luftstromerzeugungseinrichtung wie ein Ventilator vorgesehen, um im Trocknungsbereich diesen Trocknungsdampf durch einen Luftstrom zumindest teilweise zu entfernen. Der Luftstrom kann hierbei durch Saugen und/oder Blasen erzeugt werden. Es wurde ferner festgestellt, dass durch diesen Luftstrom gegebenenfalls ein ungewolltes Kühlen im Trocknungsbereich erfolgt. Diese Temperaturverringerung beeinträchtigt gegebenenfalls das Trocknen, so dass höhere Verweilzeiten erforderlich wären, die die Herstellungszeit und -kosten deutlich verlängern würden. Erfindungsgemäß ist daher zusätzlich eine Steuereinrichtung zur Steuerung der von der Luftstromerzeugungseinrichtung dem Trockenbereich zu- oder abgeführten Luftmenge vorgesehen. Hierdurch ist es möglich eine exakte Menge an Dampf aus dem Trocknungsbereich zu entfernen, andererseits aber die Temperaturverringerung im Trocknungsbereich gering zu halten, so dass bei akzeptablen, kurzen Verweilzeiten ein Durchtrocknen insbesondere einer Kante eines langgestreckten Werkstücks im Durchlaufverfahren erzielt werden kann. Zusätzlich zur Regelung oder Steuerung der dem Trocknungsbereich zu- und/oder abgeführten Luftmenge, kann mit Hilfe der Steuereinrichtung ein Regeln oder Steuern der Wärmequelle erfolgen.According to the invention, an air flow generating device such as a fan is provided in order to at least partially remove this drying steam in the drying area by an air flow. The air flow can be generated by suction and / or blowing. It was also found that this air flow may result in unwanted cooling in the drying area. This reduction in temperature may interfere with drying, so that longer residence times would be required, which would significantly increase the manufacturing time and costs. According to the invention, therefore, there is also a control device for controlling the air flow generating device amount of air supplied to or removed from the dry area. This makes it possible to remove an exact amount of steam from the drying area, but on the other hand to keep the temperature reduction in the drying area low, so that with acceptable, short dwell times, drying through, in particular of an edge, of an elongated workpiece can be achieved in a continuous process. In addition to regulating or controlling the amount of air supplied and / or discharged to the drying area, the control device can be used to regulate or control the heat source.

Desweiteren ist es bevorzugt mit Hilfe der Steuereinrichtung den Luftstrom zusätzlich in Abhängigkeit der Vorschubgeschwindigkeit des zu trocknenden Werkstücks anzupassen.Furthermore, it is preferred to use the control device to additionally adapt the air flow as a function of the feed speed of the workpiece to be dried.

Vorzugsweise erfolgt mit Hilfe der Steuereinrichtung eine Drehzahlsteuerung eines oder mehrerer Ventilatoren der Luftstromerzeugungseinrichtung, um dem Trocknungsbereich Luft zuzuführen und/oder aus dem Trocknungsbereich abzuführen bzw. abzusaugen. Insbesondere ist hierzu ein Modul wie ein Frequenzumrichter vorgesehen.The control device is preferably used to control the speed of one or more fans of the airflow generating device in order to supply air to the drying area and / or to remove or extract it from the drying area. In particular, a module such as a frequency converter is provided for this.

Vorzugsweise weist die Luftstromerzeugungseinrichtung einen Zuführkanal und/oder einen Abführkanal zum Zu- bzw. Abführen von Luft bzw. Dampf zu bzw. aus dem Trocknungsbereich auf. Der Zuführ- und/oder Abführkanal erstreckt sich hierbei vorzugsweise in Längsrichtung des Werkstücks bzw. in Transportrichtung des Werkstücks. Insbesondere ist der Zuführ- und/oder der Abführkanal parallel zu der zu trocknenden Werkstückkante ausgerichtet. Insbesondere erstreckt sich der Zu- und/oder Abführkanal über die gesamte Länge der Trocknungsvorrichtung.The air flow generating device preferably has a supply channel and / or a discharge channel for supplying or removing air or steam to and from the drying area. The feed and / or discharge channel preferably extends in the longitudinal direction of the workpiece or in the transport direction of the workpiece. In particular, the feed and / or discharge channel is aligned parallel to the workpiece edge to be dried. In particular, the feed and / or discharge channel extends over the entire length of the drying device.

Zusätzlich oder anstelle der Drehzahlsteuerung eines oder mehrerer Ventilatoren ist es auch möglich Drosseleinrichtungen vorzusehen. Derartige Drosseleinrichtungen können beispielsweise in einer Austrittsöffnung des Zufuhrkanals angeordnet sein. Je nach Einstellung der Drosseleinrichtung, die beispielsweise mehrere Drosselklappen, lamellenartige Schlitze oder dergleichen aufweist, kann die dem Trocknungsbereich zugeführte Luftmenge variiert werden. Eine entsprechende Drosseleinrichtung kann auch in einer Eintrittsöffnung eines Abführkanals vorgesehen sein. Je nachdem, ob ein Zuführkanal an der Drosseleinrichtung und/oder ein Abführkanal an der Drosseleinrichtung vorgesehen sein können, ist die entsprechende Drosseleinrichtung zur Einstellung der dem Trocknungsbereich zu- und/oder abgeführten Luftmenge mit der Steuereinrichtung verbunden.In addition or instead of the speed control of one or more fans, it is also possible to provide throttle devices. Throttle devices of this type can, for example, be located in an outlet opening of the feed channel be arranged. Depending on the setting of the throttle device, which has, for example, several throttle valves, lamellar slots or the like, the amount of air supplied to the drying area can be varied. A corresponding throttle device can also be provided in an inlet opening of a discharge duct. Depending on whether a feed channel can be provided on the throttle device and / or a discharge channel on the throttle device, the corresponding throttle device for setting the amount of air supplied and / or discharged to the drying area is connected to the control device.

2. Der erfindungsgemäße Trocknungsbereich ist in einer Trocknungskammer angeordnet. Die Trocknungskammer, die vorzugsweise einen im Wesentlichen U-förmigen Querschnitt aufweist, ist derart ausgebildet, dass der zu trocknende Teil des Werkstücks wie beispielsweise eine Werkstücckante in die Trocknungskammer ragt.2. The drying area according to the invention is arranged in a drying chamber. The drying chamber, which preferably has a substantially U-shaped cross section, is designed such that the part of the workpiece to be dried, such as a workpiece edge, protrudes into the drying chamber.

Die Trocknungskammer ist derart ausgebildet, dass sie eine sich in Längs- bzw. Transportrichtung des Werkstücks erstreckende schlitzförmige Öffnung aufweist. Durch die Öffnung ragt ein Teil des Werkstücks in die Trocknungskammer hinein. Das langgestreckte Werkstück wird in Längsrichtung des Schlitzes transportiert. Des Weiteren ist es bevorzugt, dass diejenige Kammerwand, die die schlitzförmige Öffnung ausbildet, eine Wärmeisolierplatte aufweist bzw. aus einer Wärmeisolierplatte besteht. Dies hat den Vorteil, dass die von der Wärmequelle abgegebene hohe Wärme insbesondere gegenüber der Transportvorrichtung abgeschattet wird. Es erfolgt hierdurch in bevorzugter Ausführungsform ein Abschatten der Transportvorrichtung hinsichtlich der von der Wärmequelle abgegebenen Wärme. Hierdurch ist ein Beschädigen der Transportvorrichtung vermieden. Insbesondere bei der Verwendung von Infrarotstrahlern als Wärmequellen, die insbesondere im mittleren Infrarotbereich (MIR-Bereich) strahlen, ist eine derartige Abschattung der Transportvorrichtung vorteilhaft, da anderenfalls die Transportvorrichtung zerstört oder zumindest beschädigt würde. Es ist daher besonders bevorzugt, dass die Öffnung nur eine geringfügig größere Höhe aufweist als die Dicke des Werkstücks. Insbesondere ist die Höhe der Öffnung weniger als 10 mm, insbesondere weniger als 6 mm und besonders bevorzugt weniger als 4 mm größer als die Dicke des Werkstücks. Es gelangt somit im Wesentlichen keine Wärme aus der Trocknungskammer in Richtung der Transportvorrichtung.The drying chamber is designed such that it has a slot-shaped opening that extends in the longitudinal or transport direction of the workpiece. Part of the workpiece protrudes into the drying chamber through the opening. The elongated workpiece is transported in the longitudinal direction of the slot. Furthermore, it is preferred that the chamber wall which forms the slot-shaped opening has a heat insulation plate or consists of a heat insulation plate. This has the advantage that the high heat emitted by the heat source is in particular shadowed with respect to the transport device. In a preferred embodiment, this results in the transport device being shadowed with respect to that emitted by the heat source Warmth. This prevents damage to the transport device. In particular when using infrared radiators as heat sources, which radiate in particular in the middle infrared range (MIR range), such a shading of the transport device is advantageous, since otherwise the transport device would be destroyed or at least damaged. It is therefore particularly preferred that the opening has only a slightly greater height than the thickness of the workpiece. In particular, the height of the opening is less than 10 mm, in particular less than 6 mm and particularly preferably less than 4 mm greater than the thickness of the workpiece. Essentially, there is no heat from the drying chamber in the direction of the transport device.

In besonders bevorzugter Ausführungsform ist die Transportvorrichtung insbesondere vollständig außerhalb der Trocknungskammer angeordnet.In a particularly preferred embodiment, the transport device is in particular arranged completely outside the drying chamber.

Die Wärmequelle, die vorzugsweise mehrere Infrarotleuchten aufweist, kann derart ausgebildet sein, dass mehrere Infrarotleuchten oder andere Wärmequellen das Werkstück umgeben. Bei einer Trocknungsvorrichtung zur Trocknung einer Werkstückkante ist die Wärmequelle vorzugsweise derart innerhalb der Trocknungskammer angeordnet, dass sie dem zu trocknenden Bereich des Werkstücks wie der Werkstückkante gegenüberliegt und vorzugsweise parallel zu dieser verläuft bzw. sich in Transportrichtung erstreckt.The heat source, which preferably has a plurality of infrared lights, can be designed such that a plurality of infrared lights or other heat sources surround the workpiece. In the case of a drying device for drying a workpiece edge, the heat source is preferably arranged within the drying chamber in such a way that it lies opposite the area of the workpiece to be dried, such as the workpiece edge, and preferably runs parallel to it or extends in the transport direction.

Bei einer weiteren bevorzugten Ausführungsform ist insbesondere im Trocknungsbereich des Weiteren ein Feuchtigkeitssensor vorgesehen, der mit der Steuereinrichtung verbunden ist. Ein oder mehrere Feuchtigkeitssensoren können den Feuchtigkeitsgrad messen und sind vorzugsweise in dem mindestens einen Abführkanal vorgesehen. Durch die Messung der Feuchtigkeit im Trocknungsbereich und in der abgeführten Luft kann eine Regelung der dem Trocknungsbereich zu- und/oder abgeführten Luftmenge insbesondere über Regelung von Ventilatordrehzahlen und/oder Steuerungen von Drosseleinrichtungen erzielt werden. Alternativ oder zusätzlich kann auch eine Regelung der durch die Wärmequellen zugeführten Wärmemenge erfolgen.In a further preferred embodiment, a moisture sensor is also provided, in particular in the drying area, which is connected to the control device. One or more moisture sensors can measure the degree of moisture and are preferably provided in the at least one discharge channel. By measuring the moisture in the drying area and in the discharged air, it is possible to regulate the amount of air supplied and / or discharged to the drying area, in particular by regulating fan speeds and / or controlling throttle devices be achieved. Alternatively or additionally, the amount of heat supplied by the heat sources can also be regulated.

In einer weiteren Ausführungsform ist eine Erwärmungseinrichtung zur Erwärmung der dem Trocknungsbereich zugeführten Luft vorgesehen. Hierdurch ist es möglich, trotz des Abführens von Dampf aus dem Trocknungsbereich das hierdurch hervorgerufene Absenken der Temperatur im Trocknungsbereich zu verringern oder sogar ein Absenken vollständig zu vermeiden.In a further embodiment, a heating device is provided for heating the air supplied to the drying area. This makes it possible, despite the removal of steam from the drying area, to reduce the resultant lowering of the temperature in the drying area or even to completely avoid lowering it.

Mit Hilfe der erfindungsgemäßen Trocknungsvorrichtung ist es insbesondere möglich, Schichtdicken von 500 bis 1000 µm vollständig zu trocknen bzw. eine Durchtrocknung zu erzielen. Dies kann im Durchlaufverfahren innerhalb von 20 bis 30 Sekunden erfolgen. Hierbei wird durch die Wärmequelle an der zu trocknenden Oberfläche eine Temperatur von 30°C - 80°C erzeugt. Insbesondere werden hierzu als Wärmequellen Infrarotleuchten verwendet.With the aid of the drying device according to the invention, it is in particular possible to completely dry layer thicknesses of 500 to 1000 μm or to achieve thorough drying. This can be done in a continuous process within 20 to 30 seconds. The heat source generates a temperature of 30 ° C - 80 ° C on the surface to be dried. In particular, infrared lights are used as heat sources for this.

Als Lampe werden vorzugsweise Mittelwellen-IR-Strahler mit einer Wellenlänge von insbesondere 3-50 µm eingesetzt. Diese weisen eine Oberflächentemperatur von 850°C - 900°C auf. Es ist daher bevorzugt die Strahler in einem Abstand von 3 cm - 4 cm zu dem zu trocknenden Bereich anzuordnen, um insbesondere ein Beschädigen der Oberfläche zu vermeiden.Medium-wave IR emitters with a wavelength of in particular 3-50 μm are preferably used as the lamp. These have a surface temperature of 850 ° C - 900 ° C. It is therefore preferred to arrange the emitters at a distance of 3 cm - 4 cm from the area to be dried, in particular to avoid damaging the surface.

Üblicherweise beträgt die Vorschubgeschwindigkeit des langgestreckten Werkstücks in der Trockeneinrichtung mindestens 20 m/min. Es sind jedoch auch Vorschubgeschwindigkeiten von mehr als 50m/min, insbesondere mehr als 100 m/min möglich. Mit Hilfe der erfindungsgemäßen Trocknungseinrichtung kann eine zuverlässige und auch schnelle Trocknung erfolgen. Dies ist insbesondere aus wirtschaftlichen Gründen vorteilhaft, da je Meter Trocknungslänge eine Energieaufnahme der Lampen von 6 kWh - 12 kWh, gegebenenfalls sogar bis zu 20 kWh, erfolgt.The feed speed of the elongated workpiece in the drying device is usually at least 20 m / min. However, feed speeds of more than 50 m / min, in particular more than 100 m / min, are also possible. With the help of the drying device according to the invention, reliable and also rapid drying can take place. This is particularly advantageous for economic reasons, since the energy consumption of the lamps from 6 kWh to 12 kWh, possibly even up to 20 kWh, takes place per meter of drying length.

Bei einer besonders bevorzugten Weiterbildung der Erfindung ist in dem zugeführten Luftstrom, insbesondere in dem Zuführkanal, eine Befeuchtungseinrichtung vorgesehen. Hierdurch kann die dem Trocknungsbereich zugeführte Luft befeuchtet werden. Hierdurch ist in dieser bevorzugten Ausführungsform ein sehr exaktes Einstellen der im Trocknungsbereich herrschenden Luftfeuchtigkeit möglich, sodass eine äußerst hohe Qualität erzielt werden kann. Insbesondere ist die Befeuchtungseinrichtung mit der Steuereinrichtung verbunden, sodass die Befeuchtungseinrichtung insbesondere in Abhängigkeit von einer im Trocknungsbereich von einem Sensor ermittelten Feuchtigkeit geregelt werden kann. Hierdurch ist die Gefahr der Blasenbildung insbesondere auch bei dicken Schichten von insbesondere filmbildenden Lacken erheblich verringert.In a particularly preferred development of the invention, a humidification device is provided in the air flow supplied, in particular in the feed duct. This allows the air supplied to the drying area to be humidified. In this preferred embodiment, this makes it possible to set the air humidity in the drying area very precisely, so that extremely high quality can be achieved. In particular, the humidification device is connected to the control device, so that the humidification device can be regulated in particular as a function of a moisture determined in the drying area by a sensor. As a result, the risk of blistering is considerably reduced, particularly in the case of thick layers of, in particular, film-forming lacquers.

Insbesondere ist der Trocknungsvorrichtung unmittelbar eine Beschichtungsvorrichtung nachgeordnet. Hierbei handelt es sich beispielsweise um eine Beschichtungsvorrichtung wie sie in EP 10 162 699 oder EP 11 174 355 beschrieben ist.In particular, the drying device is immediately followed by a coating device. This is, for example, a coating device as shown in EP 10 162 699 or EP 11 174 355 is described.

Nachfolgend wird die Erfindung anhand einer bevorzugten Ausführungsform unter Bezugnahme auf die Zeichnung näher erläutert.The invention is explained in more detail below on the basis of a preferred embodiment with reference to the drawing.

Die Figur zeigt eine schematische Schnittansicht einer bevorzugten Ausführungsform einer Trocknungsvorrichtung gemäß der Erfindung.The figure shows a schematic sectional view of a preferred embodiment of a drying device according to the invention.

Zur Trocknung von beschichteten langgestreckten Werkstücken im Durchlaufverfahren weist eine Transportvorrichtung im dargestellten Ausführungsbeispiel zwei schematisch dargestellte Transportrollen 10 auf. Zwischen den beiden Transportrollen 10 ist ein langgestrecktes Werkstück 12, wie zum Beispiel ein Brett, angeordnet und wird durch die Transportrollen 10 senkrecht zur Zeichenebene in Richtung eines Pfeils 14 transportiert. Im dargestellten Ausführungsbeispiel ist beispielsweise eine Kante 16 des Werkstücks 12 in der der Trocknungsvorrichtung vorgelagerten Beschichtungsvorrichtung mit Lack, Farbe oder dergleichen beschichtet worden. Zur Trocknung ist eine Wärmequelle insbesondere eine oder mehrere Infrarotlampen 18 vorgesehen. Diese verlaufen im dargestellten Ausführungsbeispiel parallel zu der beschichteten Kante bzw. Seitenfläche 16 des Werkstücks 12. Die Wärmequelle 18 ist in einem Gehäuse 20 der Trocknungsvorrichtung angeordnet. Dieses weist im dargestellten Ausführungsbeispiel einen U-förmigen Querschnitt auf, wobei die zu trocknende Fläche 16 in das Gehäuse 20 ragt.For drying coated elongate workpieces in a continuous process, a transport device in the exemplary embodiment shown has two schematically illustrated transport rollers 10. An elongated workpiece 12, such as a board, is arranged between the two transport rollers 10 and is transported by the transport rollers 10 perpendicular to the plane of the drawing in the direction of an arrow 14. In the illustrated embodiment, for example, an edge 16 of the workpiece 12 has been coated with lacquer, paint or the like in the coating device upstream of the drying device. There is a heat source for drying in particular one or more infrared lamps 18 are provided. In the exemplary embodiment shown, these run parallel to the coated edge or side surface 16 of the workpiece 12. The heat source 18 is arranged in a housing 20 of the drying device. In the exemplary embodiment shown, this has a U-shaped cross section, the surface 16 to be dried projecting into the housing 20.

Durch die Trocknungswärme entsteht in einem Trocknungsbereich 22 durch das Trocknen des Lacks oder der Farbe Trocknungsdampf. Zum Abführen des Trocknungsdampfes wird im Ausführungsbeispiel dem Trocknungsbereich 22 über einen Zuführkanal 24 Luft in Richtung eines Pfeils 26 zugeführt. Der sich ebenfalls in Längsrichtung oder Transportrichtung 14 erstreckende Zuführkanal weist einen oder mehrere Luftstromerzeugungseinrichtungen wie Ventilatoren 28 auf. Zur Regelung der dem Trocknungsbereich 22 zugeführten Luftmenge ist der mindestens eine Ventilator 28 mit einer Steuereinrichtung 30 verbunden. Ferner kann zum Vorwärmen der zugeführten Luft in dem Zuführkanal 24 eine Wärmequelle 32 vorgesehen sein, die vorzugsweise ebenfalls über die Steuereinrichtung regelbar ist.The drying heat produces drying steam in a drying area 22 by drying the lacquer or paint. In the exemplary embodiment, air is supplied to the drying area 22 via a supply channel 24 in the direction of an arrow 26 to remove the drying steam. The feed channel, which also extends in the longitudinal direction or transport direction 14, has one or more air flow generating devices such as fans 28. To regulate the amount of air supplied to the drying area 22, the at least one fan 28 is connected to a control device 30. Furthermore, for the preheating of the supplied air in the supply duct 24, a heat source 32 can be provided, which is preferably also controllable via the control device.

Des Weiteren kann im Bereich einer Austrittsöffnung 34 des Zuführkanals 24 eine Drosseleinrichtung 36 vorgesehen sein. Im dargestellten Ausführungsbeispiel ist diese als in Richtung eines Pfeils 38 schwenkbare Drosselkappe dargestellt. Durch die Drosselklappe 36 kann nicht nur ein Drosseln der zugeführten Luftmenge, sondern auch ein Umlenken erfolgen. Die Stellung der Drosselklappe kann vorzugsweise wiederum mit Hilfe der Steuereinrichtung gesteuert werden.Furthermore, a throttle device 36 can be provided in the region of an outlet opening 34 of the feed channel 24. In the illustrated embodiment, this is shown as a throttle cap which can be pivoted in the direction of an arrow 38. The throttle valve 36 can not only restrict the amount of air supplied, but also deflect it. The position of the throttle valve can in turn preferably be controlled with the aid of the control device.

Im dargestellten Ausführungsbeispiel ist dem Zuführungskanal 24 gegenüberliegend ein Abführkanal 40 vorgesehen. Der Abführkanal 40 ist ähnlich dem Zuführkanal 24 aufgebaut und weist ebenfalls eine Luftstromerzeugungseinrichtung mit beispielsweise mehreren Ventilatoren 42 auf, um Luft in Richtung eines Pfeils 44 aus dem Trocknungsbereich 22 abzusaugen. Die insbesondere mehreren Ventilatoren 42 sind zur Regelung wiederum mit der Steuereinrichtung 30 verbunden.In the exemplary embodiment shown, a discharge channel 40 is provided opposite the feed channel 24. The discharge duct 40 is constructed similarly to the feed duct 24 and also has an air flow generating device with, for example, a plurality of fans 42 in order to draw air out of the drying region 22 in the direction of an arrow 44. The particular one A plurality of fans 42 are in turn connected to the control device 30 for regulation.

Ferner kann im Bereich einer Eintrittsöffnung 46 des Abführkanals 40 wiederum eine Drosseleinrichtung 48 wie eine Drosselklappe vorgesehen sein, die in Richtung eines Pfeils 50 schwenkbar ist. Die Stellung der Drosseleinrichtung 48 kann wiederum über die Steuereinrichtung 30 gesteuert werden.Furthermore, a throttle device 48, such as a throttle valve, which can be pivoted in the direction of an arrow 50, can again be provided in the region of an inlet opening 46 of the discharge duct 40. The position of the throttle device 48 can in turn be controlled via the control device 30.

Des Weiteren ist es bevorzugt im Trocknungsbereich 22 einen Feuchtigkeitssensor 52 vorzusehen. Dieser ist wiederum mit der Steuereinrichtung 30 verbunden.Furthermore, it is preferred to provide a moisture sensor 52 in the drying area 22. This is in turn connected to the control device 30.

Desweiteren ist in einer besonders bevorzugten Ausführungsform in dem Zuführkanal 24 eine Luft-Befeuchtungseinrichtung 54 vorgesehen. Diese ist vorzugsweise mit der Steuereinrichtung 30 verbunden. Hierdurch kann verhindert werden, dass die obere Schicht eines Lacks zu schnell trocknet. Eine Filmbildung ist hiermit vermieden, sodass das Wasser aus dem Lack zur Trocknung der Lackschicht gelangt.Furthermore, in a particularly preferred embodiment, an air humidification device 54 is provided in the feed channel 24. This is preferably connected to the control device 30. This can prevent the top layer of a lacquer from drying too quickly. This prevents film formation, so that the water from the paint dries to dry the paint layer.

Eine in Richtung der Transportvorrichtung 10, die insbesondere mehrere Bänder und Rollen aufweist, weisende Kammerwand 56 ist vorzugsweise aus einer Wärmeisolierplatte hergestellt. Hierdurch ist sichergestellt, dass die von der insbesondere als IR-Leuchte ausgebildete Wärmequelle 18 abgegebene Wärmestrahlung nicht oder nur zu einem geringen Anteil die Transportvorrichtung 10 erwärmt. Hierdurch ist ein Beschädigen der Transportvorrichtung 10 vermieden. Die beiden Kammerwände bzw. Wärmeisolierplatten 56 erstrecken sich ebenfalls in Längsrichtung 14 und dienen als eine Blende. Die beiden Kammerwände 56 bilden eine Öffnung 58 aus. Die Öffnung 58 weist eine Höhe H auf, die dem Abstand der beiden Kammerwände 56 entspricht. Die Höhe H ist geringfügig größer als die Dicke d des langgestreckten Werkstücks 12. Insofern ist zwischen der Öffnung 58 und dem Werkstück 12 beidseitig nur ein geringer Spalt ausgebildet.A chamber wall 56 pointing in the direction of the transport device 10, which in particular has a plurality of belts and rollers, is preferably made of a heat insulation plate. This ensures that the heat radiation emitted by the heat source 18, which is designed in particular as an IR lamp, does not heat the transport device 10 or only to a small extent. This prevents damage to the transport device 10. The two chamber walls or heat insulating plates 56 also extend in the longitudinal direction 14 and serve as an aperture. The two chamber walls 56 form an opening 58. The opening 58 has a height H which corresponds to the distance between the two chamber walls 56. The height H is slightly larger than the thickness d of the elongated workpiece 12. In this respect, only a small gap is formed on both sides between the opening 58 and the workpiece 12.

Bei einer weiteren bevorzugten Weiterbildung der Erfindung sind mehrere Trocknungseinrichtungen, insbesondere entsprechend der vorstehend beschriebenen unterschiedlichen Ausführungsformen und besonders bevorzugt entsprechend der in der Figur dargestellten Ausführungsform, hintereinander angeordnet. Je Trocknungsvorrichtung ist es möglich, die einzelnen Parameter mit Hilfe einer entsprechenden Steuereinrichtung unterschiedlich einzustellen bzw. zu regeln. Es ist hierbei selbstverständlich möglich eine gemeinsame Steuerungsvorrichtung für die einzelnen Trocknungsvorrichtungen vorzusehen, um diese aufeinander abzustimmen.In a further preferred development of the invention, a plurality of drying devices, in particular in accordance with the different embodiments described above and particularly preferably in accordance with the embodiment shown in the figure, are arranged one behind the other. It is possible for each drying device to set or regulate the individual parameters differently with the aid of a corresponding control device. It is of course possible to provide a common control device for the individual drying devices in order to coordinate them.

Claims (14)

  1. A drying device for drying coated elongate workpieces in a continuous process, comprising
    a transport device (10) for in particular continuously transporting workpieces (12),
    a heat source (18) for generating drying heat in a drying zone (22),
    an airflow generating means (28, 42) for extracting drying steam from the and/or supplying humidity to the drying zone (22) via an airflow, and
    a control means (30) for controlling the air quantity supplied to and/or discharged from the drying zone by the airflow generating means (28, 42),
    wherein the drying zone (22) is arranged in a drying chamber (20),
    wherein the transport device (14) is arranged completely outside the drying chamber (20), wherein the drying chamber (20) comprises a chamber wall (56),
    characterized in that
    the chamber wall (56) comprising a slit-shaped opening (58) extending in the transport direction (14) such that the portion (16) to be dried of the workpiece (12) can project through the slit-shaped opening (58).
  2. The drying device according to claim 1, characterized in that the drying zone (22) of the drying chamber (20) has an essentially U-shaped cross-section.
  3. The drying device according to claim 1, characterized in that a chamber wall (56) including the slit-shaped opening (58) comprises heat insulating plates.
  4. The drying device according to any one of claims 1 to 3, characterized in that the airflow generating means comprises at least one fan (28, 42) which is connected to the control means (30) for speed control, wherein the control means (30) preferably comprises a module for speed control of the at least one fan (28, 42), in particular a frequency controller.
  5. The drying device according to any one of claims 1 to 4, characterized in that the airflow generating means (28, 42) comprises a supply duct (24) and/or a discharge duct (40) for supplying and/or discharging air and/or drying steam or is connected thereto.
  6. The drying device according to claim 5, characterized in that in an outlet opening (34) of the supply duct (24) a throttle means (36) for adjusting the air quantity supplied to the drying zone (22) is provided and/or in an inlet opening (46) of the discharge duct (40) a throttle means (48) for adjusting the air and/or steam quantity discharged from the drying zone (22) is provided.
  7. The drying device according to claim 6, characterized in that the throttle means (36) of the supply duct (24) and/or the throttle means (48) of the discharge duct (40) for adjusting the air and/or steam quantity supplied to and/or discharged from the drying zone is connected to the control means (30).
  8. The drying device according to any one of claims 1 to 7, characterized in that in the drying chamber (20) the heat source (18) is arranged in particular opposite the portion to be dried (16) of the workpiece (12) and/or the heat source (18) extends in the transport direction (14) of the workpiece (12).
  9. The drying device according to any one of claims 1 to 8, characterized in that the heat source (18) comprises at least one in particular mediumwave infrared lamp.
  10. The drying device according to any one of claims 1 to 9, characterized in that the supplied and/or discharged air quantity is controlled in particular via the speed of the fans (28, 42) and/or the at least one throttle means (36, 48) such that complete drying of the coating is realized.
  11. The drying device according to any one of claims 1 to 10, characterized in that in particular in the drying zone (22) a humidity sensor (52) connected to the control means (30) is provided, wherein the air quantity supplied to and/or discharged from the drying zone (22) is preferably regulated by the control means (30) depending on the humidity detected by the humidity sensor(52)
  12. The drying device according to any one of claims 1 to 11, characterized in that in particular in the supply duct (24) an air humidifying means (54) is provided which is preferably connected to the control means (30) for controlling/regulating.
  13. The dying device according to any one of claims 1 to 12, characterized in that the transport device (10) is in particular arranged completely outside the drying chamber (22).
  14. A method for using a drying device for drying coated elongate workpieces in a continuous process, wherein the drying means comprises:
    a transport device (10) for in particular continuously transporting workpieces (12),
    a heat source (18) for generating drying heat in a drying zone (22),
    an airflow generating means (28, 42) for extracting drying steam from the and/or supplying humidity to the drying zone (22) via an airflow, and
    a control means (30) for controlling the air quantity supplied to and/or discharged from the drying zone by the airflow generating means (28, 42), wherein the drying zone (22) is arranged in a drying chamber (20) into which the portion to be dried of the workpiece (12) projects,
    wherein the workpiece (12) is passed through the drying device such that merely the portion to be dried of the workpiece (12) projects into the drying chamber (20).
EP16161250.2A 2015-03-24 2016-03-18 Drying device Active EP3073215B1 (en)

Priority Applications (1)

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PL16161250T PL3073215T3 (en) 2015-03-24 2016-03-18 Drying device

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US9841234B2 (en) 2017-12-12
ES2805531T3 (en) 2021-02-12
DE102015205338A1 (en) 2016-09-29
EP3073215A1 (en) 2016-09-28
US20160282047A1 (en) 2016-09-29

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