EP0295427A1 - Method and device for applying a surface pressure to work pieces driven by pressbelts - Google Patents

Method and device for applying a surface pressure to work pieces driven by pressbelts Download PDF

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Publication number
EP0295427A1
EP0295427A1 EP88107536A EP88107536A EP0295427A1 EP 0295427 A1 EP0295427 A1 EP 0295427A1 EP 88107536 A EP88107536 A EP 88107536A EP 88107536 A EP88107536 A EP 88107536A EP 0295427 A1 EP0295427 A1 EP 0295427A1
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Prior art keywords
pressure
pressure medium
medium
active zone
fluid pressure
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EP88107536A
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German (de)
French (fr)
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EP0295427B1 (en
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Theodor Hymmen Firma
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/04—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band
    • B30B5/06—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band
    • B30B5/062—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band urged by directly-acting fluid pressure

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  • the present invention relates to a method and a device for applying surface pressure to workpieces operated by press belts, such as continuously moving material webs, also in the form of laminates or the like.
  • the surface pressure is generated by the pressure of a gaseous or liquid pressure medium in a sealed active zone defined on one side by the press belt.
  • You can limit the pressure chamber for example, by a circumferential, generally approximately quadrangular seal, and the pressure chamber itself is limited on the one hand by the circumferential press belt and on the back by a pressure plate, which is also a heating plate, so that the pressure medium in the Effective zone can also be heated, since usually the belt presses equipped with such pressure chambers, for example double belt presses, also require heating and / or cooling of the leading workpieces.
  • fluid pressure media such as air or oil are particularly suitable in terms of handling, controllability and sensitivity of the setting.
  • the problem remains that the in the effective zone between the back of the heating plate and the endless press belt pressure gas layer in the pressure chamber has an insulating effect on the heat transfer.
  • Attempts have been made (DE-OS 24 21 296) to replace gaseous pressure media which are even more insulating with a liquid, in particular oil or liquid metals. While liquid metals have proven technically difficult to control for this purpose and in this area of application, the use of oil has not brought about any drastic improvement, since the thermal conductivity of oil only reaches a maximum of three times the thermal conductivity of air and, in addition, considerable pollution problems may occur.
  • the present invention is therefore based on the object of demonstrating a method and an apparatus of the generic type in which the heat transfer in the effective zone between the pressure plate designed as a heating or cooling plate and the press belt is decisively improved.
  • a temperature gradient occurs exclusively in the direction from the heat donor to the receiver.
  • the pressure medium only acts as a mediator or as an intermediate layer with a very high heat transfer value due to the forced movement.
  • the heat transfer can be regulated very simply and very sensitively via the speed of the forced movement of the medium as a controlled variable.
  • the given operating pressure and the throughput speed of the workpieces are taken into account as parameters.
  • the amount of heat transferred suddenly drops, since in this case the medium, when the forced movement ceases and any heating is switched off, acts as an insulation layer between the heating plate and the press belt in the effective zone. There is therefore only a very low inertia behavior and, in particular, no overrun of the heating energy transmission.
  • the extent of the forced movement depends on the operating pressure and the extent of the desired heat transfer. In any case, it is expedient to move so violently that there is turbulent movement of the pressure medium. For gaseous media, there are movement speeds of 10 to 50 m / sec, preferably 20 to 40 m / sec. for liquid media those of 2 to 5 m / sec, preferably 4 to 5 m / sec. proven to be very useful. Expedient refinements of the subject matter of the invention, in particular also including constructive refinements of a corresponding device, are characterized in the subclaims. Embodiments are described below with reference to the accompanying drawings.
  • an active zone 4 which in the exemplary embodiment shown is formed by a pressure chamber which is delimited on one side by the press belt 1 and on the opposite side by a pressure and heating plate 5 and also known circumferential special seals 6.
  • the required surface pressure in a known manner by a z. B. gaseous, under the operating pressure pressure medium.
  • the pressure chamber is connected in the usual way to a compressor (not shown), which also continuously compensates for any leakage losses.
  • a heating device 7 is located in the pressure and heating plate.
  • a forced movement device is now provided for the pressurized gaseous medium in the active zone.
  • the pressure and heating plate 5 is dimensioned relatively large and a fan 8 is integrated in it, which is connected to the active zone 4 via an integrated pressure and suction line 9 and the pressurized gaseous pressure medium in the active chamber 4 violently forced, preferably like this strong that a turbulent flow occurs here, which leads to an extremely high heat transfer between the pressure and heating plate 5 and the press belt 1.
  • the extent of the heat transfer can be regulated very sensitively both via the operating pressure and in particular via the flow rate.
  • care is taken, for example, in a very simple manner for greater heating on a first section of the active zone 4, as seen in the direction of passage of the workpiece 3, that here the active zone 4 or the pressure chamber is protruding from a rear section Shoulder in the pressure and heating plate 5 has a narrowed cross-section, so that an increased flow rate occurs in this first work zone section 4a.
  • a pressure and heating plate 5a is provided with basically the same device structure, which, depending on the length of the active zone 4, is assigned one or more, in the exemplary embodiment shown 2, forced movement devices in the form of fans 8a, the rotating blades 8b of which are flat blades are formed and extend at least partially into the active zone 4.
  • FIG. 3 which also has the same basic structure, a front pressure and heating plate 5b is shown, in which for reasons of space, inlets and outlets 10 from the active zone 4 under the pressure and heating plate 5b are brought out.
  • the fan 8 is switched on in the lines 10 and the compressor 11 is also connected, with which leakage losses can also be continuously supplemented.
  • the operating pressure z. B. gaseous pressure medium is also directly heated in the active zone 4 and its violent forced movement in this active zone 4 also causes the extraordinary increase in heat transfer capacity.
  • an effective zone 4a can be connected to the effective zone 4 by heating the press belt 1 and thus the workpiece 3, which zone basically has exactly the same structure, only the direction of heat transfer being reversed here, i.e. one Cooling zone is formed, in which the pressure and cooling plate 5c is provided with a cooling device 7a.
  • the gaseous medium under pressure is forcefully moved in the active zone 4a for an extraordinary increase in the cooling capacity, for which purpose a fan 8 is again provided.
  • a compressor 11 is also provided here.
  • a rotary piston blower or a compressor can also be used as the forced movement device.
  • the method according to the invention consists in that, in the sealed active zone 4, 4a, the surface pressure is generated by the pressure of a fluid pressure medium and the active zone 4, 4a is heated or cooled to apply a surface pressure and to transfer heat to the press belt-driven workpieces is and that in addition, the pressure medium under operating pressure is forced to move violently in the effective zone, the expedient movement being carried out so violently in an expedient embodiment that there is in the effective zone for the operating pressurized pressure medium result in turbulent flows.
  • Flow velocities of approx. 20 to 40 m / sec for gaseous pressure media and 4 to 5 m / sec for liquid pressure media have proven to be very useful.
  • the violent forced movement can only take place on site in the effective zone.
  • a forced circulation in a closed circuit can also be provided, including the active zone.
  • the degree of heat transfer can be sensitively regulated by changing the flow rate and / or the pressure of the pressure medium.

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  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Press Drives And Press Lines (AREA)
  • Treatment Of Fiber Materials (AREA)
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Abstract

The fluid pressure medium under operational pressure in the active zone is additionally subjected to a powerful forced flow, preferably to turbulent flow. There occurs an extraordinary increase in the heat- transfer capacity. <IMAGE>

Description

Die vorliegende Erfindung betrifft ein Verfahren sowie eine Vor­richtung zum Aufbringen einer Flächenpressung auf preßbandbe­triebene Werkstücke wie beispielsweise kontinuierlich bewegte Werkstoffbahnen, auch in Form von Laminaten oder dergleichen.The present invention relates to a method and a device for applying surface pressure to workpieces operated by press belts, such as continuously moving material webs, also in the form of laminates or the like.

Bei bekannten Verfahren und Vorrichtungen (DE-OS 24 21 296) wird in einer abgedichteten, an einer Seite von dem Preßband definier­ten Wirkzone die Flächenpressung durch den Druck eines gasförmigen oder flüssigen Druckmediums erzeugt. Man kann dabei beispiels­weise die Druckkammer durch eine umlaufende, in der Regel etwa viereckig ausgebildete Dichtung begrenzen und die Druckkammer selbst wird dabei einerseits von dem umlaufenden Preßband und auf der Rückseite durch eine Druckplatte begrenzt, die gleich­zeitig auch Heizplatte ist, so daß das Druckmedium in der Wirk­zone auch beheizt werden kann, da meist die mit derartigen Druck­kammern ausgestatteten Bandpressen, beispielsweise Doppelband­pressen, auch ein Erwärmen und/oder Kühlen der vorlaufenden Werkstücke erfordern.In known methods and devices (DE-OS 24 21 296), the surface pressure is generated by the pressure of a gaseous or liquid pressure medium in a sealed active zone defined on one side by the press belt. You can limit the pressure chamber, for example, by a circumferential, generally approximately quadrangular seal, and the pressure chamber itself is limited on the one hand by the circumferential press belt and on the back by a pressure plate, which is also a heating plate, so that the pressure medium in the Effective zone can also be heated, since usually the belt presses equipped with such pressure chambers, for example double belt presses, also require heating and / or cooling of the leading workpieces.

An sich sind fluide Druckmedien wie beispielsweise Luft oder Öl von der Handhabung, Beherrschbarkeit und Feinfühligkeit der Einstellung her besonders geeignet. Problemvoll bleibt, daß die in der Wirkzone zwischen der Heizplattenrückseite und dem end­losen Preßband befindliche Druckgasschicht in der Druckkammer bezüglich der Wärmeübertragung isolierend wirkt. Man hat ver­sucht (DE-OS 24 21 296), noch stärker isolierende gasförmige Druckmedien durch ein flüssiges, insbesondere Öl oder flüssige Metalle zu ersetzen. Während sich flüssige Metalle als für diesen Einsatzzweck und in diesem Einsatzbereich technisch als kaum beherrschbar erwiesen haben, hat der Einsatz von Öl keine durchgreifende Verbesserung erbracht, da die Wärmeleit­fähigkeit von Öl auch nur maximal den dreifachen Wert der Wärmeleitfähigkeit von Luft erreicht und darüber hinaus erheb­liche Verschmutzungsprobleme auftreten können.As such, fluid pressure media such as air or oil are particularly suitable in terms of handling, controllability and sensitivity of the setting. The problem remains that the in the effective zone between the back of the heating plate and the endless press belt pressure gas layer in the pressure chamber has an insulating effect on the heat transfer. Attempts have been made (DE-OS 24 21 296) to replace gaseous pressure media which are even more insulating with a liquid, in particular oil or liquid metals. While liquid metals have proven technically difficult to control for this purpose and in this area of application, the use of oil has not brought about any drastic improvement, since the thermal conductivity of oil only reaches a maximum of three times the thermal conductivity of air and, in addition, considerable pollution problems may occur.

Es ist deshalb vorgeschlagen worden, zusätzlich mit Wärmebrücken zu arbeiten (DE-PS 33 25 578), um mittels Druckschuhen eine direkte Wärmeleitung von der Heizplatte auf das endlose Preßband zu gewährleisten. Diese die Wärmeleitung bewirkenden Druckschuhe haben jedoch erhebliche Nachteile. Abgesehen von dem sehr hohen Kraftbedarf zum Antreiben des Preßbandes entsteht an den Druck­schuhen metallischer Abrieb, der das sichere Funktionieren der umlaufenden Dichtungen für die Druckkammer in Frage stellt.It has therefore been proposed to additionally work with thermal bridges (DE-PS 33 25 578) in order to ensure direct heat conduction from the heating plate to the endless press belt by means of pressure shoes. However, these pressure shoes which cause heat conduction have considerable disadvantages. In addition to the very high power required to drive the press belt, metallic abrasion occurs on the pressure shoes, which questions the safe functioning of the circumferential seals for the pressure chamber.

Es sind schließlich auch schon Systeme bekannt geworden, bei denen man nicht ein Druckmedium in der Wirkzone beheizt, sondern bei denen Dampf (US-PS 21 35 763) oder Heißwasser (DE-OS 19 53 816) der Wirkzone in einem Kreislauf zugeführt werden. Die Beheizung erfolgt außerhalb der Wirkzone und es wird mit den üblichen Zu­führungsgeschwindigkeiten bzw. Ableitungsgeschwindigkeiten für Dampf und Heißwasser gearbeitet. Diese Systeme haben sich vor allen Dingen deshalb in der Praxis als unbrauchbar erwiesen, da sich naturgemäß das zugeführte heiße Druckmedium bei seiner Bewe­gung durch die Wirkzone abkühlt. Da derartige Wirkzonen relativ lang sind, ergibt sich vom Einlaß bis zum Auslaß ein nicht hinnehm­bares Temperaturgefälle in Durchlaufrichtung der Werkstücke.Finally, systems have also become known in which one does not heat a pressure medium in the active zone, but in which steam (US Pat. No. 2,135,763) or hot water (DE-OS 19 53 816) are fed to the active zone in a circuit. The heating takes place outside the effective zone and the usual feed speeds or discharge speeds for steam and hot water are used. Above all, these systems have proven to be unusable in practice, since the hot pressure medium supplied naturally cools down as it moves through the active zone. Because such zones of action are relative are long, there is an unacceptable temperature gradient in the direction of flow of the workpieces from the inlet to the outlet.

Der vorliegenden Erfindung liegt von daher die Aufgabe zugrunde,ein Verfahren sowie eine Vorrichtung der gattungsgemäßen Art aufzuzeigen, bei dem bzw. der der Wärmeübergang in der Wirkzone zwischen der als Heiz-oder Kühlplatte ausgebildeten Druckplatte und dem Preßband ent­scheidend verbessert wird.The present invention is therefore based on the object of demonstrating a method and an apparatus of the generic type in which the heat transfer in the effective zone between the pressure plate designed as a heating or cooling plate and the press belt is decisively improved.

Die erfindungsgemäße Lösung ergibt sich bezüglich des Verfahrens aus dem kennzeichnenden Teil des Patentanspruches 1, bezüglich der Vorrichtung aus dem Hauptvorrichtungsanspruch.The solution according to the invention results with respect to the method from the characterizing part of patent claim 1, with respect to the device from the main device claim.

Es hat sich völlig überraschend gezeigt, daß durch die vergleichs­weise heftige Zwangsbewegung des unter Druck stehenden fluiden Mediums in der Wirkzone sein Vermögen, Wärme auf das Preßband zu übertragen, außerordentlich gesteigert wird und zwar so stark, daß der Wärmeübergang besser ist als beispielsweise mit Hilfe der bekannten Druckschuhe. Durch die heftige Zwangsbewegung in der Wirkzone übernimmt das unter dem Betriebsdruck stehende fluide Medium nunmehr die Funktion eines Wärmeüberträgers von der die Wirkzone begrenzenden Heizplatte als Sender auf das Preßband, wobei hervor­zuheben ist, daß sich auf genau die gleiche Weise im Falle des Erfordernisses der Kühlung auch eine außerordentlich verbesserte Kühlung einstellt. Die Wärmeflußrichtung verläuft lediglich umge­kehr vom Preßband fort.It has been shown completely surprisingly that by the comparatively violent forced movement of the pressurized fluid medium in the effective zone, its ability to transfer heat to the press belt is increased to an extent that the heat transfer is better than, for example, with the help of known pressure shoes. Due to the violent forced movement in the effective zone, the fluid medium under the operating pressure now takes over the function of a heat exchanger from the heating plate delimiting the effective zone as a transmitter to the press belt, it being emphasized that in exactly the same way in the event of cooling being required sets an extraordinarily improved cooling. The direction of heat flow only runs in reverse from the press belt.

Bei diesem System, bei dem der Wärmespender und der Wärmeempfänger die Wirkzone begrenzen, stellt sich ein Temperaturgefälle aus­schließlich in Richtung von Wärmespender zum Empfänger ein. Das Druckmedium wirkt nur als Vermittler oder wie eine Zwischen­schicht mit nunmehr durch die Zwangsbewegung sehr hohem Wärme­durchgangswert.With this system, in which the heat donor and the heat receiver limit the effective zone, a temperature gradient occurs exclusively in the direction from the heat donor to the receiver. The pressure medium only acts as a mediator or as an intermediate layer with a very high heat transfer value due to the forced movement.

Es ist ferner hervorzuheben, daß die bei der heftigen Zwangs­bewegung entstehenden Reibungsverluste vollständig in Wärme umge­setzt werden und von daher im Falle der Wärmeübertragung mit zur Aufheizung beitragen. In bestimmten Fällen kann zumindest zeit­weilig sogar ganz der Wärmespender abgeschaltet werden.It should also be emphasized that the frictional losses resulting from the violent forced movement are completely converted into heat and therefore contribute to heating in the case of heat transfer. In certain cases, the heat donor can even be switched off completely, at least temporarily.

Es hat sich ferner herausgestellt, daß sich über die Geschwin­digkeit der Zwangsbewegung des Mediums als Regelgröße die Wärme­übertragung sehr einfach und sehr feinfühlig regeln läßt. Dabei gehen der jeweils gegebene Betriebsdruck und die Durchlaufge­schwindigkeit der Werkstücke als Parameter mit ein. Hervorzuheben ist auch, daß bei Betriebsstörungen oder am Produktionsende die übertragene Wärmemenge nun schlagartig abfällt, da in diesem Fall durch Aufhören der Zwangsbewegung und Abschalten einer etwaigen Heizung das Medium im Stillstand als Isolationsschicht zwischen Heizplatte und Preßband in der Wirkzone wirkt. Es zeigt sich somit nur ein sehr geringes Trägheitsverhalten und insbeson­dere kein Nachlauf der Heizenergie-Übertragung.It has also been found that the heat transfer can be regulated very simply and very sensitively via the speed of the forced movement of the medium as a controlled variable. The given operating pressure and the throughput speed of the workpieces are taken into account as parameters. It should also be emphasized that in the event of malfunctions or at the end of production, the amount of heat transferred suddenly drops, since in this case the medium, when the forced movement ceases and any heating is switched off, acts as an insulation layer between the heating plate and the press belt in the effective zone. There is therefore only a very low inertia behavior and, in particular, no overrun of the heating energy transmission.

Das Ausmaß der Zwangsbewegung hängt vom Betriebsdruck und dem Aus­maß der gewünschten Wärmeübertragung ab. In jedem Fall wird zweck­mäßig so heftig bewegt, daß sich eine turbulente Bewegung des Druckmediums ergibt. Für gasförmi q e Medien haben sich Bewegungs­geschwindigkeiten von 10 bis 50m/sec,vorzugsweise 20 bis 40 m/sec. für flüssige Medien solche von 2 bis 5 m/sec,vorzugsweise 4 bis 5 m/sec. als sehr zweckmäßig erwiesen.
Zweckmäßige Ausgestaltungen des Erfindungsgegenstandes insbesondere auch unter Einschluß konstruktiver Ausgestaltungen einer entspre­chenden Vorrichtung sind in den Unteransprüchen gekennzeichnet. Ausführungsbeispiele werden nachstehend unter Bezugnahme auf die beigefügten Zeichnungen näher beschrieben.The extent of the forced movement depends on the operating pressure and the extent of the desired heat transfer. In any case, it is expedient to move so violently that there is turbulent movement of the pressure medium. For gaseous media, there are movement speeds of 10 to 50 m / sec, preferably 20 to 40 m / sec. for liquid media those of 2 to 5 m / sec, preferably 4 to 5 m / sec. proven to be very useful.
Expedient refinements of the subject matter of the invention, in particular also including constructive refinements of a corresponding device, are characterized in the subclaims. Embodiments are described below with reference to the accompanying drawings.

Es zeigen
Figuren 1 - 3 stark schematisierte Ausführungsbeispiele von Vorrichtungen gemäß der Erfindung.Show it
Figures 1 - 3 highly schematic embodiments of devices according to the invention.

Bei dem in Figur 1 dargestellten Ausführungsbeispiel einer Vor­richtung zum Aufbringen einer Flächenpressung sowie Wärme auf preßbandgetriebene Werkstücke ist ein umlaufendes Preßband 1, üblicherweise aus Stahl, gezeigt, das über Umlenkwalzen 2 läuft und Werkstücke 3 wie beispielsweise Werkstoffbahnen, auch in Form von Laminaten, kontinuierlich bewegt, und zwar an einer Wirkzone 4 entlang, die im dargestellten Ausführungsbeispiel von einer Druck­kammer gebildet wird, die auf der einen seite von dem Preßband 1 begrenzt wird und auf der gegenüberliegenden Seite von einer Druck- und Heizplatte 5 sowie ferner bekannten umlaufenden Spezialdich­tungen 6. In der Wirkzone 4 bzw. der Druckkammer wird die erfor­derliche Flächenpressung in bekannter Weise durch ein z. B. gas­förmiges, unter dem Betriebsdruck stehendes Druckmedium erzeugt. Die Druckkammer steht dabei in der üblichen Weise mit einem Kompressor (nicht dargestellt) in Verbindung, der auch etwaige Leckverluste laufend ausgleicht. In der Druck- und Heizplatte befindet sich eine Heizeinrichtung 7. Zusätzlich ist nun eine Zwangsbewegungseinrichtung für das unter Druck stehende gasförmige Medium in der Wirkzone vorgesehen. Im dargestellten Ausführungs­beispiel ist hierzu die Druck- und Heizplatte 5 relativ groß be­messen und es ist in ihr ein Ventilator 8 integriert, der über eine integrierte Druck- und Saugleitung 9 mit der Wirkzone 4 in Verbindung steht und das unter Druck stehende gasförmige Druck­medium in der Wirkkammer 4 heftig zwangsbewegt, vorzugsweise so stark, daß hier eine turbulente Strömung eintritt, die zu einer außerordentlich hohen Wärmeübertragung zwischen der Druck- und Heizplatte 5 und dem Preßband 1 führt.In the embodiment of a device for applying a surface pressure and heat to workpieces driven by press belt, as shown in FIG , namely along an active zone 4, which in the exemplary embodiment shown is formed by a pressure chamber which is delimited on one side by the press belt 1 and on the opposite side by a pressure and heating plate 5 and also known circumferential special seals 6. In the effective zone 4 or the pressure chamber, the required surface pressure in a known manner by a z. B. gaseous, under the operating pressure pressure medium. The pressure chamber is connected in the usual way to a compressor (not shown), which also continuously compensates for any leakage losses. A heating device 7 is located in the pressure and heating plate. In addition, a forced movement device is now provided for the pressurized gaseous medium in the active zone. In the illustrated embodiment, the pressure and heating plate 5 is dimensioned relatively large and a fan 8 is integrated in it, which is connected to the active zone 4 via an integrated pressure and suction line 9 and the pressurized gaseous pressure medium in the active chamber 4 violently forced, preferably like this strong that a turbulent flow occurs here, which leads to an extremely high heat transfer between the pressure and heating plate 5 and the press belt 1.

Das Ausmaß der Wärmeübertragung läßt sich sowohl über den Betriebs­druck, wie insbesondere auch über die Strömungsgeschwindigkeit sehr feinfühlig regeln. Im Ausführungsbeispiel nach Figur 1 ist beispiels­weise in denkbar einfacher Weise dadurch für eine stärkere Erwärmung auf einem ersten Abschnitt der Wirkzone 4, gesehen in Durchlauf­richtung des Werkstückes 3, Sorge getragen, daß hier gegenüber einem hinteren Abschnitt die Wirkzone 4 bzw. die Druckkammer durch eine vorspringende Schulter in der Druck- und Heizplatte 5 einen verengten Querschnitt hat, so daß sich in diesem ersten Werkzonenabschnitt 4a eine erhöhte Strömungsgeschwindigkeit ein­stellt.The extent of the heat transfer can be regulated very sensitively both via the operating pressure and in particular via the flow rate. In the exemplary embodiment according to FIG. 1, care is taken, for example, in a very simple manner for greater heating on a first section of the active zone 4, as seen in the direction of passage of the workpiece 3, that here the active zone 4 or the pressure chamber is protruding from a rear section Shoulder in the pressure and heating plate 5 has a narrowed cross-section, so that an increased flow rate occurs in this first work zone section 4a.

Bei dem in Figur 2 dargestellten Ausführungsbeispiel ist bei grund­sätzlich gleichen Vorrichtungsaufbau eine Druck- und Heizplatte 5a vorgesehen, der je nach Länge der Wirkzone 4 ein oder mehrere, im dargestellten Ausführungsbeispiel 2 Zwangsbewegungseinrichtungen in Form von Ventilatoren 8a zugeordnet sind, deren rotierende Flügel 8b als Flachflügel ausgebildet sind und sich zu­mindest teilweise in die Wirkzone 4 hinein erstrecken.In the exemplary embodiment shown in FIG. 2, a pressure and heating plate 5a is provided with basically the same device structure, which, depending on the length of the active zone 4, is assigned one or more, in the exemplary embodiment shown 2, forced movement devices in the form of fans 8a, the rotating blades 8b of which are flat blades are formed and extend at least partially into the active zone 4.

Beide Ausführungsformen nach den Figuren 1 und 2 bestechen durch eine kompakte, Wärmeverluste sehr gering haltende und jegliche Anschlußprobleme vermeidende Bauweise.Both embodiments according to FIGS. 1 and 2 impress with a compact design which keeps heat losses very low and avoids any connection problems.

Bei dem in Figur 3 dargestellten, ebenfalls den gleichen grundsätz­lichen Aufbau habenden Ausführungsbeispiel ist eine vordere Druck- und Heizplatte 5b gezeigt, bei der aus Raumgründen Zu- und Ablei­tungen 10 aus der Wirkzone 4 unter der Druck- und Heizplatte 5b herausgeführt sind. In den Leitungen 10 ist einmal wiederum der Ventilator 8 eingeschaltet sowie ferner auch der Kompressor 11 angeschlossen, mit dem zugleich auch Leckverluste laufend ergänzt werden können. Das unter Betriebsdruck stehende z. B. gasförmige Druckmedium wird auch hier in der Wirkzone 4 unmittelbar beheizt und seine heftige Zwangsbewegung in dieser Wirkzone 4 bedingt auch hier die außerordentliche Erhöhung des Wärmeübertragungsvermögens.In the embodiment shown in FIG. 3, which also has the same basic structure, a front pressure and heating plate 5b is shown, in which for reasons of space, inlets and outlets 10 from the active zone 4 under the pressure and heating plate 5b are brought out. Once again, the fan 8 is switched on in the lines 10 and the compressor 11 is also connected, with which leakage losses can also be continuously supplemented. The operating pressure z. B. gaseous pressure medium is also directly heated in the active zone 4 and its violent forced movement in this active zone 4 also causes the extraordinary increase in heat transfer capacity.

Im Ausführungsbeispiel nach Figur 3 ist ferner illustriert, daß sich an die Wirkzone 4 mit einer Erwärmung des Preßbandes 1 und damit des Werkstückes 3 eine Wirkzone 4a anschließen kann, die grundsätzlich genau den gleichen Aufbau hat, wobei lediglich hier die Wärmeübergangsrichtung umgekehrt ist, also eine Kühl­zone gebildet ist, bei der die Druck- und Kühlplatte 5c mit einer Kühleinrichtung 7a versehen ist. In genau der gleichen Weise wird auch hier zur außerordentlichen Steigerung des Kühl­vermögens das unter Druck stehende gasförmige Medium in der Wirk­zone 4a heftig zwangsbewegt, wozu wiederum ein Ventilator 8 vor­gesehen ist. Auch hier ist ein Kompressor 11 vorgesehen.Als Zwangs­bewegungseinrichtung kann auch ein Drehkolbengebläse oder ein Ver­dichter verwendet werden.In the exemplary embodiment according to FIG. 3, it is also illustrated that an effective zone 4a can be connected to the effective zone 4 by heating the press belt 1 and thus the workpiece 3, which zone basically has exactly the same structure, only the direction of heat transfer being reversed here, i.e. one Cooling zone is formed, in which the pressure and cooling plate 5c is provided with a cooling device 7a. In exactly the same way, the gaseous medium under pressure is forcefully moved in the active zone 4a for an extraordinary increase in the cooling capacity, for which purpose a fan 8 is again provided. A compressor 11 is also provided here. A rotary piston blower or a compressor can also be used as the forced movement device.

Wenn mit flüssigen Druckmedien gearbeitet wird,treten an die Stelle der Ventilatoren Pumpen. Das erfindungsgemäße Verfahren besteht darin, daß zum Aufbringen einer Flächenpressung und zur Übertragung von Wärme auf die preß­bandgetriebenen Werkstücke wie bisher in der abgedichteten Wirk­zone 4, 4a die Flächenpressung durch den Druck eines fluiden Druckmediums erzeugt wird und die Wirkzone 4, 4a beheizt bzw. auch gekühlt wird und daß zusätzlich das unter Betriebsdruck stehende Druckmedium in der Wirkzone heftig zwangsbewegt wird, wobei in zweckmäßiger Ausgestaltung die Zwangsbewegung so heftig durchgeführt wird, daß sich in der Wirkzone für das unter Betriebs­ druck stehende Druckmedium turbulente Strömungen ergeben. Strömungsgeschwindigkeiten von ca. 20 bis 40 m/sec für gas­förmige Druckmedien und von 4 bis 5 m/sec für flüssige Druckmedien haben sich als sehr zweckmäßig erwiesen. Die heftige Zwangsbewegung kann vor Ort ausschließlich in der Wirkzone erfolgen. Es kann aber auch unter Einschluß der Wirkzone eine Zwangsumwälzung in einem geschlossenen Kreis­lauf vorgesehen sein.When working with liquid pressure media, pumps take the place of the fans. The method according to the invention consists in that, in the sealed active zone 4, 4a, the surface pressure is generated by the pressure of a fluid pressure medium and the active zone 4, 4a is heated or cooled to apply a surface pressure and to transfer heat to the press belt-driven workpieces is and that in addition, the pressure medium under operating pressure is forced to move violently in the effective zone, the expedient movement being carried out so violently in an expedient embodiment that there is in the effective zone for the operating pressurized pressure medium result in turbulent flows. Flow velocities of approx. 20 to 40 m / sec for gaseous pressure media and 4 to 5 m / sec for liquid pressure media have proven to be very useful. The violent forced movement can only take place on site in the effective zone. However, a forced circulation in a closed circuit can also be provided, including the active zone.

Das Ausmaß der Wärmeübertragung kann man durch Änderung der Strömungsgeschwindigkeit und/oder des Druckes des Druckmediums feinfühlig regeln.The degree of heat transfer can be sensitively regulated by changing the flow rate and / or the pressure of the pressure medium.

Zur Erzielung der erfinderischen Wirkung ist es nicht erforder­lich das Druckmedium in einem geschlossenen Kreislauf zu führen; es kann auch im Bereich der die Druckkammer umlaufend begrenzen- den Dichtungen ein erhöhter Verlust an gasförmigem Druckmedium vorgesehen und des aus der Druckkammer abströmende Druckmedium durch Einspeisung einer entsprechenden Menge an Druckmedium laufend ersetzt werden.In order to achieve the inventive effect, it is not necessary to run the pressure medium in a closed circuit; an increased loss of gaseous pressure medium can also be provided in the area of the seals surrounding the pressure chamber, and the pressure medium flowing out of the pressure chamber can be continuously replaced by feeding in a corresponding amount of pressure medium.

Claims (13)

1. Verfahren zum Aufbringen einer Flächenpressung und Wärme auf preßbandgetriebene Werkstücke, bei dem in einer abgedichteten, auf einer Seite von dem Preßband definierten Wirkzone die Flächenpressung durch den Druck eines fluiden Druckmediums erzeugt wird und das Druckmedium in der Wirkzone beheizt wird, dadurch gekennzeichnet, daß das fluide Druckmedium in der Wirkzone (4, 4a) zusätzlich heftig zwangs­bewegt wird.1. A method for applying a surface pressure and heat to workpieces driven by a press belt, in which in a sealed zone defined on one side by the press belt the surface pressure is generated by the pressure of a fluid pressure medium and the pressure medium is heated in the active zone, characterized in that the fluid pressure medium in the active zone (4, 4a) is additionally forced violently. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das fluide Druckmedium mit turbulenter Strömung zwangsbewegt wird.2. The method according to claim 1, characterized in that the fluid pressure medium is forced to move with turbulent flow. 3. Verfahren nach einem oder mehreren oder vorhergehenden Ansprüche,dadurch gekennzeichnet,daß das Druckmedium mit Strömungs­geschwindigkeiten von 2 bis 50 m/sec.,vorzugsweise 20 bis 40 m/sec bei gasförmigen und 4 bis 5 m/sec bei flüssigen Druckmedien bewegt wird.3. The method according to one or more or preceding claims, characterized in that the pressure medium is moved at flow rates of 2 to 50 m / sec., Preferably 20 to 40 m / sec with gaseous and 4 to 5 m / sec with liquid pressure media. 4. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das fluide Druckmedium vor Ort in der Wirkzone (4) zwangsbewegt wird.4. The method according to one or more of the preceding claims, characterized in that the fluid pressure medium is positively moved on site in the active zone (4). 5. Verfahren nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das fluide Druckmedium in einem geschlossenen, die Wirkzone (4) einschließenden Kreislauf zwangsbewegt wird.5. The method according to one or more of claims 1 to 3, characterized in that the fluid pressure medium is forcibly moved in a closed circuit which includes the active zone (4). 6. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche dadurch gekennzeichnet, daß man das Ausmaß des Wärmeübertragungs­vermögens des Druckmediums durch Varitation der Strömungsgeschwin­digkeit und/oder des Druckes steuert.6. The method according to one or more of the preceding claims, characterized in that the extent of the heat transfer capacity of the pressure medium is controlled by varying the flow rate and / or the pressure. 7. Verfahren nach einem der Ansprüche 1 bis 6,dadurch gekennzeichnet, daß bei stillstehenden Preßbändern die Zwangsbewegung des Druck­mediums beendet wird.7. The method according to any one of claims 1 to 6, characterized in that the forced movement of the printing medium is ended when the press belts are at a standstill. 8. Vorrichtung zur Durchführung des Verfahrens nach einem oder mehreren der vorhergehenden Ansprüche,mit einem Preßband (1),das eine Seite einer Druckkammer (4,4a) begrenzt,die ferner durch eine angrenzende Druck- und Heiz- bzw. Kühlplatte (5,5a,5b,5c) und einer umlaufenden Dichtung (6) zwischen der Platte und dem Preßband (1) definiert ist und die mit unter Betriebsdruck stehenden fluiden Druckmedium speisbar ist, dadurch gekennzeichnet,daß der Druck­kammer (4,4a) eine Zwangsbewegungseinrichtung (8,8a,8b) zur Er­zeugung einer heftigen Zwangsbewegung des fluiden Druckmediums zu­geordnet ist.8. Apparatus for carrying out the method according to one or more of the preceding claims, with a press belt (1) which delimits one side of a pressure chamber (4,4a), which is further by an adjacent pressure and heating or cooling plate (5, 5a, 5b, 5c) and a circumferential seal (6) between the plate and the press belt (1) is defined and which can be fed with fluid pressure medium under operating pressure, characterized in that the pressure chamber (4,4a) has a forced movement device (8 , 8a, 8b) for generating a violent forced movement of the fluid pressure medium. 9. Vorrichtung nach Anspruch 8,dadurch gekennzeichnet,daß die Zwangsbewegungseinrichtung ein Ventilator (8) ist.9. The device according to claim 8, characterized in that the forced movement device is a fan (8). 10.Vorrichtung nach Anspruch 9,dadurch gekennzeichnet, daß der Venti­lator (8) in die Druck-und Heizplatte (5) integriert ist.10.The device according to claim 9, characterized in that the fan (8) in the pressure and heating plate (5) is integrated. 11. Vorrichtung nach Anspruch 8,dadurch gekennzeichnet, daß die Zwangs­bewegungseinrichtung durch ein oder mehrere Ventilatoren (8a,8b) gebildet ist,deren Flügel (8b) in die Druckkammer (4) ragen.11. The device according to claim 8, characterized in that the forced movement device is formed by one or more fans (8a, 8b), the blades (8b) of which protrude into the pressure chamber (4). 12. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet,daß die Zwangsbewegungseinrichtung ein Drehkolbengebläse oder ein Verdichter ist.12. The apparatus according to claim 8, characterized in that the positive movement device is a rotary blower or a compressor. 13, Vorrichtung nach einem oder mehreren der Ansprüche 1 bis 12, da­durch gekennzeichnet,daß die Druckkammer (4) eine Zone (4a) ver­ringerten Strömungsquerschnittes aufweist.13, Device according to one or more of claims 1 to 12, characterized in that the pressure chamber (4) has a zone (4a) of reduced flow cross-section.
EP88107536A 1987-06-15 1988-05-11 Method and device for applying a surface pressure to work pieces driven by pressbelts Expired - Lifetime EP0295427B1 (en)

Priority Applications (1)

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AT88107536T ATE69579T1 (en) 1987-06-15 1988-05-11 METHOD AND DEVICE FOR APPLYING A SURFACE PRESSURE TO PRESS BELT DRIVEN WORKPIECES.

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DE3719976 1987-06-15
DE19873719976 DE3719976A1 (en) 1987-06-15 1987-06-15 METHOD AND DEVICE FOR APPLYING A SURFACE PRESS TO WORKPIECE DRIVEN BY PRESSURE BELTS

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EP0295427A1 true EP0295427A1 (en) 1988-12-21
EP0295427B1 EP0295427B1 (en) 1991-11-21

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EP (1) EP0295427B1 (en)
JP (2) JPH0191998A (en)
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DE (2) DE3719976A1 (en)
ES (1) ES2026599T3 (en)
FI (1) FI88894C (en)
IN (1) IN171921B (en)
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EP0394655A1 (en) * 1989-04-25 1990-10-31 Firma Theodor Hymmen Method and device for heating the press band of a press
EP0550782A1 (en) * 1990-12-24 1993-07-14 Kurt Held Continuous double-band press
US5592874A (en) * 1993-09-14 1997-01-14 Pcd Polymere Gesellschaft M.B.H. Double belt press with hydrostatic belt support
WO1996032255A1 (en) * 1995-04-10 1996-10-17 Minnesota Mining And Manufacturing Company Two-stage laminator apparatus
WO1997039882A1 (en) * 1996-04-20 1997-10-30 Theodor Hymmen Double band press for producing and/or coating web-shaped or plate-shaped workpieces of all kinds
US6009803A (en) * 1996-04-20 2000-01-04 Firma Theodor Hymmen Double band press for making and/or coating plate-shaped or web-shaped workpieces of all types

Also Published As

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DE3866289D1 (en) 1992-01-02
DE3719976C2 (en) 1989-10-19
JPH04113195U (en) 1992-10-02
UA9999A (en) 1996-09-30
ES2026599T3 (en) 1992-05-01
FI882843A0 (en) 1988-06-14
US5713271A (en) 1998-02-03
LV11139A (en) 1996-04-20
FI88894B (en) 1993-04-15
ATE69579T1 (en) 1991-12-15
IN171921B (en) 1993-02-06
LV11139B (en) 1996-08-20
RU1828438C (en) 1993-07-15
US5558016A (en) 1996-09-24
ZA884234B (en) 1989-03-29
JPH0191998A (en) 1989-04-11
FI882843A (en) 1988-12-16
DE3719976A1 (en) 1988-12-29
CN1015528B (en) 1992-02-19
JP2500929Y2 (en) 1996-06-12
EP0295427B1 (en) 1991-11-21
FI88894C (en) 1993-07-26
CN1030045A (en) 1989-01-04

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