EP0550782B1 - Continuous double-band press - Google Patents

Continuous double-band press Download PDF

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Publication number
EP0550782B1
EP0550782B1 EP19920100239 EP92100239A EP0550782B1 EP 0550782 B1 EP0550782 B1 EP 0550782B1 EP 19920100239 EP19920100239 EP 19920100239 EP 92100239 A EP92100239 A EP 92100239A EP 0550782 B1 EP0550782 B1 EP 0550782B1
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EP
European Patent Office
Prior art keywords
double
press according
band press
band
pressure
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EP19920100239
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German (de)
French (fr)
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EP0550782A1 (en
Inventor
Kurt Held
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Individual
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Individual
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Priority claimed from DE4041850A external-priority patent/DE4041850A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/24—Moulding or pressing characterised by using continuously acting presses having endless belts or chains moved within the compression zone
    • 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

Definitions

  • the invention relates to a continuously operating double belt press for the production of laminates, chipboard or fiberboard, plywood or the like according to the preamble of claim 1.
  • Double belt presses are used for the continuous production of endless web-shaped pressed material, in particular for the production of decorative laminate laminates, copper-clad electro-laminates, thermoplastic webs, chipboard, fiberboard and the like.
  • These double belt presses have two endless rotating press belts, between which the material to be pressed is cured under the action of pressure and possibly also heat while being transported in the forward direction. Some pressed material webs also require cooling under pressure after the exposure to heat in order to harden completely.
  • the so-called isobaric machines of this type have pressure chambers which are delimited in the vertical direction and laterally by sliding surface seals by a pressure plate and the press belt. In these pressure chambers, the pressure is built up using fluid pressure media such as oil or compressed air.
  • the inlet-side deflection drums of the double belt press To supply heat to the pressed material, it is known to design the inlet-side deflection drums of the double belt press to be heatable. As a result, the press belts of the double belt press are heated on the heated deflection drums. The press belts then transport the amount of heat absorbed into the area in which the pressed material lying between the two press belts is placed under surface pressure, the so-called reaction zone, and give off the heat there to the pressed material. However, due to the limited heat capacity of the press belts, this amount of heat is not sufficient in many cases.
  • the pressure plates can furthermore be designed as heatable heating plates or for the dissipation of heat as cooled cooling plates. Because of the poor thermal conductivity of fluid media, however, very little heat can be supplied from the heating plates to the press belt or from the press belt via the fluid pressure medium the cooling plates are removed. It is also possible to heat or cool the fluid pressure medium itself. However, due to the relatively low press belt speeds, this amount of heat transferred from the fluid pressure medium to the press belt by means of convective heat transfer is small and is practically insignificant.
  • heat-conducting elements which consist of a good heat-conductive material and which are arranged with a surface to form a good heat-conducting contact on the pressure plate in the double belt press.
  • the other surface of the heat-conducting elements touches the inside of the press belts in the area of the reaction zone, so that the press belt slides along this surface during operation of the double belt press.
  • the printing plates are heated to a higher temperature than the target temperature of the reaction zone, so that a heat gradient arises between the printing plates and the press belts and a heat flow flows from the pressure plates via the heat-conducting elements onto the press belt.
  • the invention has for its object to develop a double belt press of the type mentioned so that from the heated fluid pressure medium located in the pressure chamber to supply a larger amount of heat to the press belt or to be removed from the press belt to the cooled fluid pressure medium.
  • the advantages that can be achieved with the invention consist in particular in that the heat exchange between the fluid pressure medium and the press belt takes place in the vicinity of the press belt and thus long distances with large thermal resistances are eliminated. It is further advantageous that the heat is not only exchanged by convection between the press belt and the fluid pressure medium, but also by convection between the elements according to the invention in the pressure chamber and the fluid pressure medium and this heat then between the elements and the press belt by means of heat conduction is transmitted. This allows a much larger amount of heat to be transferred than was previously possible through turbulent forced movement of the fluid pressure medium, since the heat transfer area of the press belt, which is limited by the size of the pressure chambers, is greatly increased by the elements according to the invention.
  • the continuously operating double belt press 1 shown in Figure 1 consists of a lower press belt unit 2 and an upper press belt unit 3, which are arranged one above the other.
  • the press belt units 2, 3 are in turn composed of two deflection drums 4, 5 or 6, 7 and an endless press belt 8, 9 each.
  • the press belt 8, 9, which usually consists of a high-tensile steel band, is guided around the deflection drums 4, 5 and 6, 7 and tensioned by means of hydraulic cylinders 10.
  • the four deflection drums 4, 5, 6, 7 are rotatably mounted in a press frame (not shown in the drawing for reasons of clarity). At least one deflection drum of each press belt unit 2, 3 is driven by a motor, so that the two press belts 8, 9 move according to the arrows in the deflection drums 4, 7 at the same speed. Between the lower belt run of the upper press belt 9 and the upper belt run of the lower press belt 8 is the reaction zone 11, in which the pressing material web 12, which runs from right to left in the drawing, is pressed under surface pressure and heat and / or cooling during the passage through the double belt press 1 becomes.
  • the pressed material web 12 can consist, for example, of fabrics impregnated with synthetic resin, laminates, fiber-binder mixtures, thermoplastic webs and the like.
  • the pressed material web 12 is individual glass fiber fabric webs which are layered one on top of the other, which are impregnated with an epoxy resin, and copper foil webs lying on the surfaces of the layer structure and which are pressed in the double belt press 1 to form a copper-clad laminate web.
  • a copper-clad laminate serves as the starting material for the production of printed circuit boards.
  • pressure plates 13 are arranged in the press frame of the double belt press 1, of which the pressure is applied hydraulically to the inner sides of the press belts 8, 9 and then transferred from these to the pressed material web 12.
  • a pressurizable fluid pressure medium is brought into the space between the pressure plate 13 and the inside of the press belt 8, 9.
  • the so-called pressure chamber 14 is delimited by an annular self-contained, arranged in the pressure plate 13 and pressed on the inside of the press belt 8, 9 sliding surface seal 15, along which the press belt 8, 9 slides.
  • a synthetic oil is preferably used as the pressure medium. However, a gas, for example compressed air, can also be used just as well.
  • the sliding surface seal 15 consists of a U-shaped retaining strip 17 in which the actual sealing body 18 is fastened.
  • the U-shaped retaining strip 17 is arranged in a groove 19 of the pressure plate 13 and is pressurized from the bottom of the groove with a pressure medium, so that the sealing body 18 is pressed with a surface against the moving press belt 8, 9 and so the pressure chamber 14 to the atmosphere seals.
  • an O-ring 20 bears in the groove 19, which in turn seals the groove 19 from the atmosphere.
  • the inlet-side deflection drums 4, 7 can be designed to be heatable. As can be seen in more detail in FIG. 2, bores 22 through which a heated heat transfer medium flows are made in the jacket 21 of the cylindrical deflection drums 4, 7. The heat then flows from the inlet-side deflection drums 4, 7 onto the press belts 8, 9, which transport the amount of heat absorbed into the reaction zone 11 and deliver it there to the material to be pressed 12. Due to the limited heat capacity of the press belts 8, 9, however, the amount of heat transported in this way into the reaction zone 11 is in many cases not sufficient to harden the material web 12 to be pressed.
  • the heating or cooling of the pressure medium itself can be carried out by heatable or coolable pressure plates 13.
  • bores 35 are arranged in the pressure plates 13.
  • a fluid heat transfer medium flows through these bores 35, which emits or receives heat from the pressure plates 13.
  • heat is then absorbed by the pressure medium at the heated pressure plates 13 or released to the cooled pressure plates 13.
  • the heating or cooling of the pressure medium can also take place in a heat exchanger outside the double belt press 1 and the pressure medium can then be introduced and removed in the circuit via the inlet openings 16, which can be seen in FIG. 3, into the pressure chamber 14.
  • elements 25 are arranged in the pressure chamber 14, as can be seen in FIGS. 3 and 4. These elements 25 have a body 27 with a circular base 26, the is pressed elastically to the inside of the press belt 8, 9.
  • the fluid heated pressure medium flowing turbulently in the pressure chamber 14 additionally emits heat to the surface of the body 27 of the element 25.
  • the heat absorbed by the element 25 is conducted by means of heat conduction in the body 27 of the element 25, which consists of a good heat-conducting material, to the base surface 26 thereof and is transferred from there to the press belt 8, 9 sliding along this surface 26. If the pressure medium in the pressure chamber 14 is cooled, the heat flow is just reversed.
  • the elements 25 are arranged offset, in order to allow the most uniform possible heat transfer on the entire press belt 8, 9.
  • the more detailed design of the element 25 can be seen in FIG. 4. It has a body 27 which has a stepped, rotationally symmetrical cross section. In the center of the body 27 there is a depression 31 on the side facing the pressure plate 13, in the middle of which a vertical pin 28 is in turn inserted. The pin 28 in turn engages in a corresponding groove 29 in the pressure plate 13.
  • the groove 29 in the pressure plate 13 has a shoulder 30 on the side facing the press belt 8, 9.
  • a compression spring 32 is inserted into the recess 31 at one end and is supported on the shoulder 30 at the other end.
  • the element 25 is resiliently applied to the inside of the press belt 8, 9 with the base surface 26 and is therefore movable in the vertical direction to compensate for thickness fluctuations in the material to be pressed 12, the element 25 being guided by means of the pin 28 .
  • each individual part of this surface enlargement 34 has the shape of a disk which projects from the body 27 of the element 25 and projects into the surrounding pressure medium.
  • the disks of the surface enlargement 34 consist of a highly thermally conductive material, for example of copper or bronze, and are connected to the body 27 with good thermal contact. This connection can be made, for example, by welding or soldering, for example by means of a brazed connection. It will Solder also selected from a good heat-conductive material, so that no undesirable thermal resistance arises between the surface enlargement 34 and the body 27. For example, a silver alloy or an alloy of copper and tin is suitable as the solder.
  • the protruding individual parts of the surface enlargement 34 protrude into the pressure medium so that their entire surface, which is significantly larger than that of the body 27 per se, is available for convective heat exchange between the pressure medium in the pressure chamber 14 and the element 25.
  • a further improvement in the heat transfer can be achieved in that the individual parts of the surface enlargement 34 are themselves provided with ribs, projections and depressions or other unevenness.
  • the element 25 has a body 27 and surface enlargements 34 attached to it.
  • the surface enlargements 34 and the body 27 of the element 25 can also consist of one piece. Under certain circumstances, it may even be sufficient to provide only the body 27 in the element 25 without the surface enlargements 34, if the heat which is then convectively exchanged between the turbulently forced pressure medium in the pressure chamber 14 and the body 27 is already sufficient.
  • the elements 25 have a body 27 with a circular base area 26. However, they can also have a body with any other shape.
  • Elements 37 with a rectangular base area 36 have also proven to be particularly expedient.
  • the body 39 of the element 37 which is also pressed elastically with its base 36 against the inside of the press belt 8, 9, has a rod-shaped, elongated shape with a step-shaped cross section.
  • elongated, rectangular disks 40 are arranged as surface enlargement 41 on the step-shaped steps of the body 39.
  • the elements 37 can be designed such that they extend over the entire width of the pressure chamber 14.
  • the body 39 of the element 37 has alternating cuts 38 on both sides, as can be seen in FIG 37 fluctuations in thickness in the press material web 12 and the resulting vertical movement of the press belt 8, 9 can adapt elastically.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)

Description

Die Erfindung betrifft eine kontinuierlich arbeitende Doppelbandpresse zur Herstellung von Laminaten, Span- oder Faserplatten, Sperrholz oder dergleichen gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a continuously operating double belt press for the production of laminates, chipboard or fiberboard, plywood or the like according to the preamble of claim 1.

Doppelbandpressen (siehe auch DE-OS 24 21 296) dienen zur kontinuierlichen Herstellung von endlosem bahnförmigem Preßgut, insbesondere zur Herstellung von dekorativen Schichtstofflaminaten, kupferkaschierten Elektrolaminaten, Thermoplastbahnen, Spanplatten, Faserplatten und dergleichen. Diese Doppelbandpressen besitzen zwei endlos umlaufende Preßbänder, zwischen denen die Preßgutbahnen unter Einwirkung von Druck und gegebenenfalls auch Wärme bei gleichzeitigem Transport in Vorlaufrichtung ausgehärtet wird. Manche Preßgutbahnen benötigen zur vollständigen Aushärtung auch eine nach der Wärmeeinwirkung vorgenommene Kühlung unter Druck. Zur Erzeugung des auf die Preßgutbahn wirkenden Drucks besitzen die sogenannten isobaren Maschinen dieser Gattung Druckkammern, die von einer Druckplatte und dem Preßband in vertikaler Richtung und seitlich durch Gleitflächendichtungen begrenzt werden. In diesen Druckkammern wird der Druck durch fluide Druckmittel, wie Öl oder Druckluft, aufgebaut.Double belt presses (see also DE-OS 24 21 296) are used for the continuous production of endless web-shaped pressed material, in particular for the production of decorative laminate laminates, copper-clad electro-laminates, thermoplastic webs, chipboard, fiberboard and the like. These double belt presses have two endless rotating press belts, between which the material to be pressed is cured under the action of pressure and possibly also heat while being transported in the forward direction. Some pressed material webs also require cooling under pressure after the exposure to heat in order to harden completely. To generate the pressure acting on the material to be pressed, the so-called isobaric machines of this type have pressure chambers which are delimited in the vertical direction and laterally by sliding surface seals by a pressure plate and the press belt. In these pressure chambers, the pressure is built up using fluid pressure media such as oil or compressed air.

Zur Zuführung von Wärme auf das Preßgut ist es bekannt, die einlaufseitigen Umlenktrommeln der Doppelbandpresse beheizbar auszubilden. Dadurch werden die Preßbänder der Doppelbandpresse an den beheizten Umlenktrommeln erwärmt. Die Preßbänder transportieren dann die aufgenommene Wärmemenge in den Bereich, in dem das zwischen den beiden Preßbändern liegende Preßgut unter Flächendruck gesetzt wird, die sogenannte Reaktionszone, und geben die Wärme dort an das Preßgut ab. Aufgrund der beschränkten Wärmekapazität der Preßbänder reicht diese Wärmemenge in vielen Fällen jedoch nicht aus.To supply heat to the pressed material, it is known to design the inlet-side deflection drums of the double belt press to be heatable. As a result, the press belts of the double belt press are heated on the heated deflection drums. The press belts then transport the amount of heat absorbed into the area in which the pressed material lying between the two press belts is placed under surface pressure, the so-called reaction zone, and give off the heat there to the pressed material. However, due to the limited heat capacity of the press belts, this amount of heat is not sufficient in many cases.

Zur Zuführung von Wärme in der Reaktionszone können weiter die Druckplatten als beheizbare Heizplatten oder zur Abführung von Wärme als gekühlte Kühlplatten ausgebildet sein. Wegen der schlechten Wärmeleitfähigkeit fluider Medien kann jedoch über das fluide Druckmittel von den Heizplatten nur sehr wenig Wärme auf das Preßband zugeführt oder von dem Preßband auf die Kühlplatten abgeführt werden. Weiter ist es möglich, das fluide Druckmittel selbst zu beheizen oder zu kühlen. Jedoch ist aufgrund der relativ geringen Preßbandgeschwindigkeiten diese mittels konvektiver Wärmeübertragung vom fluiden Druckmittel auf das Preßband übertragene Wärmemenge gering und fällt praktisch nicht ins Gewicht.For the supply of heat in the reaction zone, the pressure plates can furthermore be designed as heatable heating plates or for the dissipation of heat as cooled cooling plates. Because of the poor thermal conductivity of fluid media, however, very little heat can be supplied from the heating plates to the press belt or from the press belt via the fluid pressure medium the cooling plates are removed. It is also possible to heat or cool the fluid pressure medium itself. However, due to the relatively low press belt speeds, this amount of heat transferred from the fluid pressure medium to the press belt by means of convective heat transfer is small and is practically insignificant.

Aus der DE-OS 37 19 976 ist ein Verfahren und eine Vorrichtung bekannt geworden, um die konvektive Wärmeübertragung von dem Druckmittel auf das Preßband zu verbessern. Dies wird durch Ventilatoren erreicht, die in der Druckkammer angeordnet sind, und das Druckmittel zwangsbewegen, so daß eine turbolente Strömung entsteht. Es hat sich aber herausgestellt, daß auch mit diesem Verfahren in vielen Fällen immer noch nicht genügend Wärme auf das Preßband in der Reaktionszone übertragen werden kann, da die eigentliche Wärmeübertragungsfläche durch die innerhalb der Druckkammer befindliche Preßbandfläche gebildet wird und die Druckkammer aus wirtschaftlichen und technischen Gründen bestimmte maximale Längen nicht überschreiten kann.From DE-OS 37 19 976 a method and a device have become known to improve the convective heat transfer from the pressure medium to the press belt. This is achieved by fans, which are arranged in the pressure chamber and force the pressure medium, so that a turbulent flow arises. However, it has been found that even with this method, in many cases it is still not possible to transfer sufficient heat to the press belt in the reaction zone, since the actual heat transfer surface is formed by the press belt surface located within the pressure chamber and the pressure chamber for economic and technical reasons cannot exceed certain maximum lengths.

Eine weitere Möglichkeit zur Übertragung zusätzlicher Wärme im Bereich der Reaktionszone auf die Preßbänder ist aus der DE-OS 33 25 578 bekannt geworden. Dort sind wärmeleitende Elemente gezeigt, die aus einem gut wärmeleitfähigen Material bestehen und mit einer Fläche unter Ausbildung eines guten Wärmeleitkontakts an der Druckplatte in der Doppelbandpresse angeordnet sind. Die andere Fläche der wärmeleitenden Elemente berührt die Innenseiten der Preßbänder im Bereich der Reaktionszone, so daß das Preßband an dieser Fläche während des Betriebes der Doppelbandpresse entlanggleitet. Die Druckplatten sind auf eine höhere Temperatur als die Solltemperatur der Reaktionszone aufgeheizt, so daß zwischen den Druckplatten und den Preßbändern ein Wärmegefälle entsteht und ein Wärmestrom von den Druckplatten über die wärmeleitenden Elemente auf das Preßband fließt. Diese zusätzliche Wärme wird von den Preßbändern dann auf das Preßgut übertragen. Mit einer solchen Anordnung ist auch eine Kühlung der Preßbänder möglich, indem die Druckplatte gekühlt wird. Nachteil kann jedoch auch hier sein, daß durch des relativ weiten Weges von der Druckplatte bis in die Reaktionszone ein erhöhter Wärmewiderstand auftritt, so daß in manchen Anwendungsfällen auch mit einer solchen Anordnung nicht genügend Wärme zu übertragen ist.Another way of transferring additional heat in the reaction zone to the press belts is known from DE-OS 33 25 578. There are shown heat-conducting elements which consist of a good heat-conductive material and which are arranged with a surface to form a good heat-conducting contact on the pressure plate in the double belt press. The other surface of the heat-conducting elements touches the inside of the press belts in the area of the reaction zone, so that the press belt slides along this surface during operation of the double belt press. The printing plates are heated to a higher temperature than the target temperature of the reaction zone, so that a heat gradient arises between the printing plates and the press belts and a heat flow flows from the pressure plates via the heat-conducting elements onto the press belt. This additional heat is then transferred from the press belts to the material to be pressed. With such an arrangement, cooling of the press belts is also possible by cooling the pressure plate. However, a disadvantage here can also be that the relatively long path from the pressure plate to the reaction zone results in increased thermal resistance, so that in in some applications, even with such an arrangement, insufficient heat can be transferred.

Der Erfindung liegt die Aufgabe zugrunde, eine Doppelbandpresse der eingangs erwähnten Art so weiter zu entwickeln, daß von dem in der Druckkammer befindlichen erwärmten fluiden Druckmittel eine größere Wärmemenge auf das Preßband zuzuführen bzw. vom Preßband auf das gekühlte fluide Druckmittel abzuführen ist.The invention has for its object to develop a double belt press of the type mentioned so that from the heated fluid pressure medium located in the pressure chamber to supply a larger amount of heat to the press belt or to be removed from the press belt to the cooled fluid pressure medium.

Die Lösung dieser Aufgabe wird durch die im Kennzeichen des Patentanspruchs 1 beschriebene technische Lehre vermittelt.This object is achieved by the technical teaching described in the characterizing part of patent claim 1.

Die mit der Erfindung erzielbaren Vorteile bestehen insbesondere darin, daß der Wärmeaustausch zwischen dem fluiden Druckmittel und dem Preßband in der Nähe des Preßbandes stattfindet und somit weite Wege mit großen Wärmewiderständen entfallen. Weiter vorteilhaft ist, daß die Wärme nicht nur durch Konvektion zwischen dem Preßband und dem fluiden Druckmittel ausgetauscht wird, sondern zusätzlich durch Konvektion zwischen den in der Druckkammer befindlichen erfindungsgemäßen Elementen und dem fluiden Druckmittel und diese Wärme dann zwischen den Elementen und dem Preßband mittels Wärmeleitung weiter übertragen wird. Dadurch läßt sich eine weitaus größere Wärmemenge als es bisher durch turbolente Zwangsbewegung des fluiden Druckmittels möglich war übertragen, da die durch die Größe der Druckkammern beschränkte Wärmeübertragungsfläche des Preßbandes durch die erfindungsgemäßen Elemente stark vergrößert wird.The advantages that can be achieved with the invention consist in particular in that the heat exchange between the fluid pressure medium and the press belt takes place in the vicinity of the press belt and thus long distances with large thermal resistances are eliminated. It is further advantageous that the heat is not only exchanged by convection between the press belt and the fluid pressure medium, but also by convection between the elements according to the invention in the pressure chamber and the fluid pressure medium and this heat then between the elements and the press belt by means of heat conduction is transmitted. This allows a much larger amount of heat to be transferred than was previously possible through turbulent forced movement of the fluid pressure medium, since the heat transfer area of the press belt, which is limited by the size of the pressure chambers, is greatly increased by the elements according to the invention.

Ein bevorzugtes Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird im folgenden näher beschrieben. Es zeigen:

Figur 1
schematisch eine Doppelbandpresse im Schnitt aus der Seitenansicht,
Figur 2
einen Schnitt durch den Einlaufbereich in die Doppelbandpresse,
Figur 3
eine Draufsicht auf die Druckplatte von der Preßbandrückseite aus gesehen,
Figur 4
einen Schnitt entlang der Linie A-A in der Figur 3,
Figur 5
eine weitere Ausführungsform der Erfindung und
Figur 6
eine Draufsicht in Richtung B aus Figur 5.
A preferred embodiment of the invention is shown in the drawings and is described in more detail below. Show it:
Figure 1
schematically a double belt press in section from the side view,
Figure 2
a section through the inlet area into the double belt press,
Figure 3
a plan view of the printing plate seen from the back of the press belt,
Figure 4
4 shows a section along the line AA in FIG. 3,
Figure 5
a further embodiment of the invention and
Figure 6
a plan view in direction B of Figure 5.

Die in Figur 1 dargestellte kontinuierlich arbeitende Doppelbandpresse 1 besteht aus einer unteren Preßbandeinheit 2 und einer oberen Preßbandeinheit 3, die übereinander angeordnet sind. Die Preßbandeinheiten 2, 3 setzen sich wiederum aus je zwei Umlenktrommeln 4, 5 bzw. 6, 7 und je einem endlosen Preßband 8, 9 zusammen. Das gewöhnlicherweise aus einem hochzugfesten Stahlband bestehende Preßband 8, 9 ist um die Umlenktrommeln 4, 5 bzw. 6, 7 herumgeführt und mittels Hydraulikzylindern 10 gespannt.The continuously operating double belt press 1 shown in Figure 1 consists of a lower press belt unit 2 and an upper press belt unit 3, which are arranged one above the other. The press belt units 2, 3 are in turn composed of two deflection drums 4, 5 or 6, 7 and an endless press belt 8, 9 each. The press belt 8, 9, which usually consists of a high-tensile steel band, is guided around the deflection drums 4, 5 and 6, 7 and tensioned by means of hydraulic cylinders 10.

Die vier Umlenktrommeln 4, 5, 6, 7 sind in einem in der Zeichnung aus Übersichtlichkeitsgründen nicht dargestellten Pressengestell drehbar gelagert. Mindestens eine Umlenktrommel jeder Preßbandeinheit 2, 3 wird durch einen Motor angetrieben, so daß sich die beiden Preßbänder 8, 9 entsprechend den Pfeilen in den Umlenktrommeln 4, 7 mit gleicher Geschwindigkeit bewegen. Zwischen dem unteren Bandtrum des oberen Preßbandes 9 und dem oberen Bandtrum des unteren Preßbandes 8 liegt die Reaktionszone 11, in der die in der Zeichnung von rechts nach links vorlaufende Preßgutbahn 12 unter Flächendruck und Wärmeeinwirkung und/oder Kühlung während des Durchlaufs durch die Doppelbandpresse 1 verpreßt wird.The four deflection drums 4, 5, 6, 7 are rotatably mounted in a press frame (not shown in the drawing for reasons of clarity). At least one deflection drum of each press belt unit 2, 3 is driven by a motor, so that the two press belts 8, 9 move according to the arrows in the deflection drums 4, 7 at the same speed. Between the lower belt run of the upper press belt 9 and the upper belt run of the lower press belt 8 is the reaction zone 11, in which the pressing material web 12, which runs from right to left in the drawing, is pressed under surface pressure and heat and / or cooling during the passage through the double belt press 1 becomes.

Die Preßgutbahn 12 kann beispielsweise aus mit Kunstharz imprägnierten Geweben, Schichtstoffen, Faser-Bindemittel-Gemischen, Thermoplastbahnen und dergleichen bestehen. Im vorliegenden Ausführungsbeispiel handelt es sich bei der Preßgutbahn 12 um einzelne, zu einem Schichtgebilde aufeinandergeschichtete Glasfasergewebebahnen, die mit einem Epoxyharz imprägniert sind, und auf den Oberflächen des Schichtgebildes aufliegenden Kupferfolienbahnen, die in der Doppelbandpresse 1 zu einer kupferkaschierten Laminatbahn verpreßt werden. Ein solches kupferkaschiertes Laminat dient als Ausgangsmaterial für die Herstellung von Leiterplatten.The pressed material web 12 can consist, for example, of fabrics impregnated with synthetic resin, laminates, fiber-binder mixtures, thermoplastic webs and the like. In the present exemplary embodiment, the pressed material web 12 is individual glass fiber fabric webs which are layered one on top of the other, which are impregnated with an epoxy resin, and copper foil webs lying on the surfaces of the layer structure and which are pressed in the double belt press 1 to form a copper-clad laminate web. Such a copper-clad laminate serves as the starting material for the production of printed circuit boards.

Zur Erzeugung des auf die Preßgutbahn 12 in der Reaktionszone 11 einwirkenden Flächendrucks sind im Pressengestell der Doppelbandpresse 1 Druckplatten 13 angeordnet, von denen der Druck hydraulisch auf die Innenseiten der Preßbänder 8, 9 aufgebracht und dann von diesen auf die Preßgutbahn 12 übertragen wird. Bei der hydraulischen Druckübertragung wird ein unter Druck setzbares fluides Druckmittel in den Raum zwischen der Druckplatte 13 und der Innenseite des Preßbandes 8, 9 gebracht. Zu den Seiten ist dieser Raum, die sogenannte Druckkammer 14, von einer ringförmig in sich geschlossenen, in der Druckplatte 13 angeordneten und an der Innenseite des Preßbandes 8, 9 angepreßten Gleitflächendichtung 15 begrenzt, an der das Preßband 8, 9 entlanggleitet. Als Druckmittel wird vorzugsweise ein synthetisches Öl verwendet. Genausogut kann jedoch auch ein Gas, beispielsweise Druckluft, verwendet werden. Zur Zuführung des Druckmittels in die Druckkammer 14 befinden sich in der Druckplatte 13 Einlaßöffnungen 16, die in Figur 3 zu sehen sind.To generate the surface pressure acting on the pressed material web 12 in the reaction zone 11, pressure plates 13 are arranged in the press frame of the double belt press 1, of which the pressure is applied hydraulically to the inner sides of the press belts 8, 9 and then transferred from these to the pressed material web 12. In the hydraulic pressure transmission, a pressurizable fluid pressure medium is brought into the space between the pressure plate 13 and the inside of the press belt 8, 9. To the sides, this space, the so-called pressure chamber 14, is delimited by an annular self-contained, arranged in the pressure plate 13 and pressed on the inside of the press belt 8, 9 sliding surface seal 15, along which the press belt 8, 9 slides. A synthetic oil is preferably used as the pressure medium. However, a gas, for example compressed air, can also be used just as well. For supplying the pressure medium into the pressure chamber 14 there are inlet openings 16 in the pressure plate 13, which can be seen in FIG. 3.

Die Gleitflächendichtung 15 besteht, wie in Figur 4 näher gezeigt ist, aus einer U-förmigen Halteleiste 17, in der der eigentliche Dichtungskörper 18 befestigt ist. Die U-förmige Halteleiste 17 ist in einer Nut 19 der Druckplatte 13 angeordnet und wird vom Nutgrund her mit einem Druckmittel beaufschlagt, so daß der Dichtungskörper 18 mit einer Fläche gegen das sich wegende Preßband 8, 9 angepreßt wird und so die Druckkammer 14 zur Atmosphäre abdichtet. An der U-förmigen Halteleiste 17 liegt in der Nut 19 ein O-Ring 20 an, der die Nut 19 wiederum gegenüber der Atmosphäre abdichtet.As is shown in more detail in FIG. 4, the sliding surface seal 15 consists of a U-shaped retaining strip 17 in which the actual sealing body 18 is fastened. The U-shaped retaining strip 17 is arranged in a groove 19 of the pressure plate 13 and is pressurized from the bottom of the groove with a pressure medium, so that the sealing body 18 is pressed with a surface against the moving press belt 8, 9 and so the pressure chamber 14 to the atmosphere seals. On the U-shaped retaining strip 17, an O-ring 20 bears in the groove 19, which in turn seals the groove 19 from the atmosphere.

Zur Erwärmung der Preßbänder 8, 9 können die einlaufseitigen Umlenktrommeln 4, 7 beheizbar ausgebildet sein. Wie in Figur 2 näher zu sehen ist, sind dazu im Mantel 21 der zylinderförmigen Umlenktrommeln 4, 7 Bohrungen 22 eingebracht, durch die ein erwärmtes Wärmeträgermittel fließt. Die Wärme fließt von den einlaufseitigen Umlenktrommeln 4, 7 dann auf die Preßbänder 8, 9, die die aufgenommene Wärmemenge in die Reaktionszone 11 transportieren und dort an die Preßgutbahn 12 abgeben. Aufgrund der beschränkten Wärmekapazität der Preßbänder 8, 9 reicht die solchermaßen in die Reaktionszone 11 transportierte Wärmemenge in vielen Fällen zur Aushärtung der Preßgutbahn 12 jedoch nicht aus.To heat the press belts 8, 9, the inlet-side deflection drums 4, 7 can be designed to be heatable. As can be seen in more detail in FIG. 2, bores 22 through which a heated heat transfer medium flows are made in the jacket 21 of the cylindrical deflection drums 4, 7. The heat then flows from the inlet-side deflection drums 4, 7 onto the press belts 8, 9, which transport the amount of heat absorbed into the reaction zone 11 and deliver it there to the material to be pressed 12. Due to the limited heat capacity of the press belts 8, 9, however, the amount of heat transported in this way into the reaction zone 11 is in many cases not sufficient to harden the material web 12 to be pressed.

Ergänzend oder alternativ zur Beheizung der einlaufseitigen Umlenktrommeln 4, 7 kann von dem erwärmten fluiden Druckmittel in der Druckkammer 14 weitere Wärme auf das Preßband 8, 9 und von dort auf die in der Reaktionszone 11 befindliche Preßgutbahn 12 übertragen werden. Alternativ ist es auch möglich die Preßbänder 8, 9 und damit die Preßgutbahn 12 durch Abführung von Wärme auf das gekühlte Druckmittel in der Druckkammer 14 zu kühlen. Diese Übertragung von Wärme zwischen dem fluiden Druckmittel in der Druckkammer 14 und dem Preßband 8, 9 erfolgt mittels Konvektion. Zur Verbesserung der konvektiven Wärmeübertragung wird das fluide Druckmittel in eine turbolente Zwangsbewegung versetzt. Handelt es sich um ein flüssiges Druckmittel, so können zur Erzeugung der Zwangsbewegung in der Zeichnung nicht gezeigte Pumpen verwendet werden. Handelt es sich um ein gasförmiges Druckmittel, so können in der Druckkammer 14 in der Figur 4 schematisch gezeigte Ventilatoren 23 angeordnet sein, die mittels Motoren 24 angetrieben werden, so daß das in der Druckkammer 14 befindliche fluide Druckmittel in turbolente Zwangsbewegung versetzt wird.In addition or as an alternative to heating the inlet-side deflection drums 4, 7, further heat can be transferred from the heated fluid pressure medium in the pressure chamber 14 to the press belt 8, 9 and from there to the press material web 12 located in the reaction zone 11. Alternatively, it is also possible to cool the press belts 8, 9 and thus the material to be pressed 12 by dissipating heat to the cooled pressure medium in the pressure chamber 14. This transfer of heat between the fluid pressure medium in the pressure chamber 14 and the press belt 8, 9 takes place by means of convection. To improve convective heat transfer, the fluid pressure medium is forced into a turbulent movement. If it is a liquid pressure medium, pumps (not shown in the drawing) can be used to generate the forced movement. If it is a gaseous pressure medium, fans 23, shown schematically in FIG. 4, can be arranged in the pressure chamber 14, which are driven by motors 24, so that the fluid pressure medium in the pressure chamber 14 is set into turbulent forced movement.

Die Erwärmung oder Kühlung des Druckmittels selbst kann durch beheiz- oder kühlbare Druckplatten 13 erfolgen. Wie in Figur 1 gezeigt ist, sind dazu Bohrungen 35 in den Druckplatten 13 angeordnet. Diese Bohrungen 35 werden von einem fluiden Wärmeträgermittel durchflossen, das Wärme an die Druckplatten 13 abgibt oder von diesen aufnimmt. Durch konvektive Wärmeübertragung des turbolent zwangsbewegten fluiden Druckmittels in der Druckkammer 14 wird von dem Druckmittel dann Wärme an den beheizten Druckplatten 13 aufgenommen bzw. an die gekühlten Druckplatten 13 abgegeben.The heating or cooling of the pressure medium itself can be carried out by heatable or coolable pressure plates 13. For this purpose, as shown in FIG. 1, bores 35 are arranged in the pressure plates 13. A fluid heat transfer medium flows through these bores 35, which emits or receives heat from the pressure plates 13. By convective heat transfer of the turbulently forced fluid pressure medium in the pressure chamber 14, heat is then absorbed by the pressure medium at the heated pressure plates 13 or released to the cooled pressure plates 13.

Alternativ oder zusätzlich kann die Erwärmung oder Kühlung des Druckmittels auch in einem Wärmetauscher außerhalb der Doppelbandpresse 1 erfolgen und das Druckmittel dann im Kreislauf über die Einlaßöffnungen 16, die in Figur 3 zu sehen sind, in die Druckkammer 14 ein- und abgeführt werden.Alternatively or additionally, the heating or cooling of the pressure medium can also take place in a heat exchanger outside the double belt press 1 and the pressure medium can then be introduced and removed in the circuit via the inlet openings 16, which can be seen in FIG. 3, into the pressure chamber 14.

Die mittels Konvektion auf die beschriebene Art übertragbare Wärmemenge reicht jedoch in vielen Anwendungsfällen nicht aus. Zur weiteren Verbesserung der Wärmeübertragung sind in der Druckkammer 14 erfindungsgemäß Elemente 25 angeordnet, wie in den Figuren 3 und 4 zu sehen ist. Diese Elemente 25 besitzen einen Körper 27 mit kreisrunder Grundfläche 26, die elastisch an die Innenseite des Preßbandes 8, 9 angepreßt wird. Das in der Druckkammer 14 turbolent strömende fluide erwärmte Druckmittel gibt zusätzlich Wärme an die Oberfläche des Körpers 27 des Elementes 25 ab. Die von dem Element 25 aufgenommene Wärme wird mittels Wärmeleitung in dem aus gut wärmeleitfähigen Material bestehenden Körper 27 des Elementes 25 auf dessen Grundfläche 26 geleitet und von dort auf das an dieser Oberfläche 26 entlanggleitende Preßband 8, 9 übertragen. Ist das Druckmittel in der Druckkammer 14 gekühlt, so verläuft der Wärmefluß gerade umgekehrt. Wie in Figur 3 zu sehen ist, sind die Elemente 25 versetzt angeordnet, um eine möglichst gleichmäßige Wärmeübertragung auf dem gesamten Preßband 8, 9 zu gestatten.However, the amount of heat that can be transferred by convection in the manner described is not sufficient in many applications. To further improve the heat transfer, elements 25 according to the invention are arranged in the pressure chamber 14, as can be seen in FIGS. 3 and 4. These elements 25 have a body 27 with a circular base 26, the is pressed elastically to the inside of the press belt 8, 9. The fluid heated pressure medium flowing turbulently in the pressure chamber 14 additionally emits heat to the surface of the body 27 of the element 25. The heat absorbed by the element 25 is conducted by means of heat conduction in the body 27 of the element 25, which consists of a good heat-conducting material, to the base surface 26 thereof and is transferred from there to the press belt 8, 9 sliding along this surface 26. If the pressure medium in the pressure chamber 14 is cooled, the heat flow is just reversed. As can be seen in FIG. 3, the elements 25 are arranged offset, in order to allow the most uniform possible heat transfer on the entire press belt 8, 9.

Die nähere Ausbildung des Elementes 25 ist in Figur 4 zu sehen. Es besitzt einen Körper 27, der einen treppenförmigen, rotationssymmetrischen Querschnitt besitzt. Im Mittelpunkt des Körpers 27 befindet sich auf der der Druckplatte 13 zugewandten Seite eine Vertiefung 31, in deren Mitte wiederum ein vertikaler Stift 28 eingesetzt ist. Der Stift 28 greift seinerseits in eine korrespondierende Nut 29 in der Druckplatte 13 ein. Die Nut 29 in der Druckplatte 13 besitzt auf der dem Preßband 8, 9 zugewandten Seite einen Absatz 30. Eine Druckfeder 32 ist mit einem Ende in die Vertiefung 31 eingesetzt und stützt sich mit dem anderen Ende an dem Absatz 30 ab. Aufgrund des Federdrucks der Druckfeder 32 wird das Element 25 elastisch an die Innenseite des Preßbandes 8, 9 mit der Grundfläche 26 angelegt und ist dadurch in vertikaler Richtung zum Ausgleich von Dickenschwankungen in der Preßgutbahn 12 beweglich, wobei das Element 25 mittels des Stiftes 28 geführt wird.The more detailed design of the element 25 can be seen in FIG. 4. It has a body 27 which has a stepped, rotationally symmetrical cross section. In the center of the body 27 there is a depression 31 on the side facing the pressure plate 13, in the middle of which a vertical pin 28 is in turn inserted. The pin 28 in turn engages in a corresponding groove 29 in the pressure plate 13. The groove 29 in the pressure plate 13 has a shoulder 30 on the side facing the press belt 8, 9. A compression spring 32 is inserted into the recess 31 at one end and is supported on the shoulder 30 at the other end. Due to the spring pressure of the compression spring 32, the element 25 is resiliently applied to the inside of the press belt 8, 9 with the base surface 26 and is therefore movable in the vertical direction to compensate for thickness fluctuations in the material to be pressed 12, the element 25 being guided by means of the pin 28 .

Wegen des stufenförmigen Querschnittes sind auf dem Körper 27 Absätze 33 vorhanden, an denen Oberflächenvergrößerungen 34 angeordnet sind. Jedes Einzelteil dieser Oberflächenvergrößerung 34 besitzt die Gestalt einer Scheibe, die vom Körper 27 des Elementes 25 absteht und in das umgebende Druckmittel hineinragt. Die Scheiben der Oberflächenvergrößerung 34 bestehen aus einem gut wärmeleitfähigen Material, beispielsweise aus Kupfer oder Bronze und sind mit gutem Wärmeleitkontakt mit dem Körper 27 verbunden. Diese Verbindung kann beispielsweise durch Verschweißen oder Verlöten erfolgen, beispielsweise mittels einer Hartlötverbindung. Dabei wird das Lot ebenfalls aus gut wärmeleitfähigem Material gewählt, damit zwischen der Oberflächenvergrößerung 34 und dem Körper 27 kein unerwünschter Wärmewiderstand entsteht. Als Lot eignet sich beispielsweise eine Silberlegierung oder eine Legierung aus Kupfer und Zinn.Because of the step-shaped cross section, there are 27 shoulders 33 on the body, on which surface enlargements 34 are arranged. Each individual part of this surface enlargement 34 has the shape of a disk which projects from the body 27 of the element 25 and projects into the surrounding pressure medium. The disks of the surface enlargement 34 consist of a highly thermally conductive material, for example of copper or bronze, and are connected to the body 27 with good thermal contact. This connection can be made, for example, by welding or soldering, for example by means of a brazed connection. It will Solder also selected from a good heat-conductive material, so that no undesirable thermal resistance arises between the surface enlargement 34 and the body 27. For example, a silver alloy or an alloy of copper and tin is suitable as the solder.

Die abstehenden Einzelteile der Oberflächenvergrößerung 34 ragen in das Druckmittel hinein, so daß deren gesamte Oberfläche, die bedeutend größer als diejenige des Körpers 27 an sich ist, zum konvektiven Wärmeaustausch zwischen dem Druckmittel in der Druckkammer 14 und dem Element 25 zur Verfügung steht. Eine weitere Verbesserung der Wärmeübertragung läßt sich noch dadurch erreichen, indem die Einzelteile der Oberflächenvergrößerung 34 selbst wiederum mit Rippen, Vorsprüngen und Vertiefungen oder sonstigen Unebenheiten versehen sind.The protruding individual parts of the surface enlargement 34 protrude into the pressure medium so that their entire surface, which is significantly larger than that of the body 27 per se, is available for convective heat exchange between the pressure medium in the pressure chamber 14 and the element 25. A further improvement in the heat transfer can be achieved in that the individual parts of the surface enlargement 34 are themselves provided with ribs, projections and depressions or other unevenness.

Im beschriebenen Ausführungsbeispiel besitzt das Element 25 einen Körper 27 und daran befestigte Oberflächenvergrößerungen 34. Dies ist aus fertigungstechnischen Gründen zwar vorzuziehen, allerdings können die Oberflächenvergrößerungen 34 und der Körper 27 des Elementes 25 auch aus einem Stück bestehen. Es kann unter Umständen sogar ausreichend sein, beim Element 25 nur den Körper 27 ohne die Oberflächenvergrößerungen 34 vorzusehen, falls die dann zwischen dem turbolent zwangsbewegten Druckmittel in der Druckkammer 14 und dem Körper 27 konvektiv ausgetauschte Wärme bereits ausreicht.In the exemplary embodiment described, the element 25 has a body 27 and surface enlargements 34 attached to it. Although this is preferable for manufacturing reasons, the surface enlargements 34 and the body 27 of the element 25 can also consist of one piece. Under certain circumstances, it may even be sufficient to provide only the body 27 in the element 25 without the surface enlargements 34, if the heat which is then convectively exchanged between the turbulently forced pressure medium in the pressure chamber 14 and the body 27 is already sufficient.

Entsprechend dem Ausführungsbeispiel besitzen die Elemente 25 einen Körper 27 mit kreisrunder Grundfläche 26. Sie können jedoch auch einen Körper mit einer beliebig anderen Form besitzen. Als besonders zweckmäßig haben sich auch Elemente 37 mit rechteckförmiger Grundfläche 36 erwiesen, wie sie in den Figuren 5 und 6 zu sehen sind. Der Körper 39 des Elementes 37, der ebenfalls elastisch mit seiner Grundfläche 36 an die Innenseite des Preßbandes 8, 9 angepreßt wird, besitzt eine stabförmige, längliche Gestalt mit einem treppenförmigen Querschnitt. An den treppenförmigen Stufen des Körpers 39 sind wiederum längliche, rechteckförmige Scheiben 40 als Oberflächenvergroßerung 41 angeordnet. Die Elemente 37 können so ausgebildet sein, daß sie über die gesamte Breite der Druckkammer 14 reichen. Um dennoch eine bestimmte Flexibilität über die Breite der Druckkammer 14 zu gewährleisten, besitzt der Körper 39 des Elementes 37 abwechselnd beidseitige Einschnitte 38, wie sie in Figur 6, in der Draufsicht von der Preßbandrückseite auf das Element 37, zu sehen sind, so daß das Element 37 sich Dickenschwankungen in der Preßgutbahn 12 und daraus resultierenden vertikalen Bewegung des Preßbandes 8, 9 elastisch anpassen kann.According to the exemplary embodiment, the elements 25 have a body 27 with a circular base area 26. However, they can also have a body with any other shape. Elements 37 with a rectangular base area 36, as can be seen in FIGS. 5 and 6, have also proven to be particularly expedient. The body 39 of the element 37, which is also pressed elastically with its base 36 against the inside of the press belt 8, 9, has a rod-shaped, elongated shape with a step-shaped cross section. In turn, elongated, rectangular disks 40 are arranged as surface enlargement 41 on the step-shaped steps of the body 39. The elements 37 can be designed such that they extend over the entire width of the pressure chamber 14. Around to ensure a certain flexibility over the width of the pressure chamber 14, the body 39 of the element 37 has alternating cuts 38 on both sides, as can be seen in FIG 37 fluctuations in thickness in the press material web 12 and the resulting vertical movement of the press belt 8, 9 can adapt elastically.

Selbstverständlich sind für die Einzelteile der Oberflächenvergrößerungen 34, 41, die sich an den Körpern 27, 39 der Elemente 25, 37 befinden, nicht nur die in den obigen Ausführungsbeispielen beschriebene scheibenförmige Gestalt möglich, sondern es sind auch andere Formen denkbar, beispielsweise bürstenartige Ansätze. Wichtig ist, daß die Oberflächenvergrößerungen in das fluide Druckmittel hineinragen und einen guten Wärmeleitkontakt zu dem Körper 27, 39 des Elementes 25, 37 besitzen.Of course, for the individual parts of the surface enlargements 34, 41 which are located on the bodies 27, 39 of the elements 25, 37, not only the disk-shaped shape described in the above exemplary embodiments is possible, but other shapes are also conceivable, for example brush-like approaches. It is important that the surface enlargements protrude into the fluid pressure medium and have good thermal contact with the body 27, 39 of the element 25, 37.

Claims (26)

  1. Continuously operating double-band press for the production of laminates, chipboard or fibreboard, plywood or the like, which comprises an upper and a lower endless press-band (8, 9), which bands are each guided by two respective deflecting drums (4, 5, 6, 7), which are borne to be rotatable in a rigid press frame, and on the undersides of which bands acts a pressure produced by fluid means in pressure chambers (14), these pressure chambers being bounded in vertical direction by pressure plates (13) fastened in the press frame and in horizontal direction by sliding surface seals (15), with elements (25, 37), which are arranged in the pressure chamber (14) and urged elastically against the inward press band side so that the element by one surface touches the inward side of the press band which slides along this surface during the operation of the double-band press and wherein the element (25, 37) consists of thermally well conducting material, characterised thereby, that the element (25, 37) comprises a body (27, 39) and protruding individual parts of a surface enlargement (34, 41) of a surface enlargement (34, 41), the protruding individual parts consist of a thermally well conducting material and are in good thermal contact with the body (27, 39) of the element (25, 37) and that the protruding individual parts of the surface enlargement (34, 41) project into the fluid pressure medium.
  2. Double-band press according to claim 1, characterised thereby, that the individual parts of the surface enlargement (34, 41) are provided with ribs, projections, depressions or unevennesses.
  3. Double-band press according to claim 1 or 2, characterised thereby, that the surface enlargement (34, 41) and the body (27, 39) of the element (25, 37) consist of a single contiguous part.
  4. Double-band press according to claim 1 or 2, characterised thereby, that the surface enlargement (34, 41) consists of separate individual parts which are fastened at the body (27, 39) of the element (25, 37).
  5. Double-band press according to claim 4, characterised thereby, that the individual parts of the surface enlargement (34, 41) are welded together with the body (27, 39) of the element (25, 37).
  6. Double-band press according to claim 4, characterised thereby, that the individual parts of the surface enlargements (34, 41) are soldered together with the body (27, 39) of the element (25, 37).
  7. Double-band press according to claim 6, characterised thereby, that a hard solder connection is concerned.
  8. Double-band press according to claim 6 or 7, characterised thereby, that a solder of thermally well conducting material is concerned.
  9. Double-band press according to claim 8, characterised thereby, that a silver alloy or an alloy of copper and tin is concerned in the case of the solder.
  10. Double-band press according to one of the claims 1 to 10, characterised thereby, that the body (27, 39) consists of copper or bronze.
  11. Double-band press according to one of the claims 1 to 10, characterised thereby, that the individual parts of the surface enlargement (34, 41) consist of copper or bronze.
  12. Double-band press according to one of the claims 4 to 11, characterised thereby, that the body (27, 39) of the element (25, 37) has a staircase-shaped cross-section with steps (33) and the individual parts of the surface enlargement (34, 41) are each fastened at a respective step of the body (27, 39).
  13. Double-band press according to claim 12, characterised thereby, that the individual parts of the surface enlargement (34, 41) have the structure of a disc.
  14. Double-band press according to one of the claims 1 to 13, characterised thereby, that the body (27) of the element (25) has a rotationally symmetrical structure with a circular base area (26).
  15. Double-band press according to one of the claims 1 to 13, characterised thereby, that the body (39) of the element (37) has a rod-shaped elongate structure with a rectangular base area (36).
  16. Double-band press according to claim 15, characterised thereby, that the element (37) extends across the width of the pressure chamber (14).
  17. Double-band press according to claim 16, characterised thereby, that the body (39) of the element (37) has incisions (38) at both sides in order to obtain flexibility in its longitudinal direction.
  18. Double-band press according to one of the claims 1 to 17, characterised thereby, that the element (25, 37) is urged elastically by the base area (26, 36) against the inward press band side (8, 9) by means of a compression spring (32).
  19. Double-band press according to claim 18, characterised thereby, that the element (25, 37) is guided in vertical direction by means of a pin (28), which is fastened in a depression (31) of the body (27) and in turn engages into a corresponding groove (29) of the pressure plate (13).
  20. Double-band press according to claim 18 and 19, characterised thereby, that the groove (29) in the pressure plate (13) has a step (30) and the compression spring (32) is arranged by one end in the depression (31) and by the other end at the step (30).
  21. Double-band press according to one of the claims 1 to 20, characterised thereby, that the fluid pressure medium is heated.
  22. Double-band press according to one of the claims 1 to 20, characterised thereby, that the fluid pressure medium is cooled.
  23. Double-band press according to claim 21 or 22, characterised thereby, that bores (35), through which a heat carrier medium flows for the heating or cooling of the pressure plate (13), are arranged in the pressure plate (13).
  24. Double-band press according to claim 23, characterised thereby, that a means for the production of forced turbulent movement of the pressure medium is arranged in the pressure chamber (14).
  25. Double-band press according to claim 24, characterised thereby, that a fan (23) is concerned in the case of the means.
  26. Double-band press according to claim 24, characterised thereby, that pumps are concerned in the case of the means.
EP19920100239 1990-12-24 1992-01-09 Continuous double-band press Expired - Lifetime EP0550782B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19920100239 EP0550782B1 (en) 1990-12-24 1992-01-09 Continuous double-band press

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4041850A DE4041850A1 (en) 1990-12-24 1990-12-24 CONTINUOUSLY WORKING DOUBLE BAND PRESS
EP19920100239 EP0550782B1 (en) 1990-12-24 1992-01-09 Continuous double-band press

Publications (2)

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EP0550782A1 EP0550782A1 (en) 1993-07-14
EP0550782B1 true EP0550782B1 (en) 1995-10-18

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EP19920100239 Expired - Lifetime EP0550782B1 (en) 1990-12-24 1992-01-09 Continuous double-band press

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6048436A (en) * 1997-02-07 2000-04-11 Kvaerner Panel Systems Gbmh Maschinen-Und Anlagenbau Continuously operating double-belt press

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11503677A (en) * 1995-04-10 1999-03-30 ミネソタ マイニング アンド マニュファクチャリング カンパニー Two-step laminator device
DE19615771A1 (en) * 1996-04-20 1997-10-23 Hymmen Theodor Gmbh Double belt press for the manufacture and / or for the coating of sheet or plate-shaped workpieces of all kinds

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3348485C2 (en) * 1983-07-15 1995-06-08 Held Kurt Double belt press for the continuous production of laminates
DE3534478C2 (en) * 1985-09-27 1995-01-26 Held Kurt Double belt press for the continuous pressing of material webs at elevated temperatures
DE3616619C2 (en) * 1986-05-16 1994-11-17 Held Kurt Sealing arrangement on a double belt press and method for producing the associated sealing body
DE3709958A1 (en) * 1987-03-26 1988-10-13 Santrade Ltd Double-belt press
DE3719976A1 (en) * 1987-06-15 1988-12-29 Hymmen Theodor Gmbh METHOD AND DEVICE FOR APPLYING A SURFACE PRESS TO WORKPIECE DRIVEN BY PRESSURE BELTS
DE3921364A1 (en) * 1989-06-29 1991-01-03 Held Kurt CONTINUOUSLY WORKING DOUBLE BAND PRESS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6048436A (en) * 1997-02-07 2000-04-11 Kvaerner Panel Systems Gbmh Maschinen-Und Anlagenbau Continuously operating double-belt press

Also Published As

Publication number Publication date
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