EP0642917B1 - Double-band press with hydrostatic support for the band - Google Patents

Double-band press with hydrostatic support for the band Download PDF

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Publication number
EP0642917B1
EP0642917B1 EP94113602A EP94113602A EP0642917B1 EP 0642917 B1 EP0642917 B1 EP 0642917B1 EP 94113602 A EP94113602 A EP 94113602A EP 94113602 A EP94113602 A EP 94113602A EP 0642917 B1 EP0642917 B1 EP 0642917B1
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EP
European Patent Office
Prior art keywords
pressure
press
belt
pressing
belts
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Expired - Lifetime
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EP94113602A
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German (de)
French (fr)
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EP0642917A1 (en
Inventor
Wilfried Dipl.-Ing. Blauhut
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Borealis AG
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PCD Polymere AG
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Priority to SI9430184T priority Critical patent/SI0642917T1/en
Publication of EP0642917A1 publication Critical patent/EP0642917A1/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 double belt press with a hydrostatic belt support, at the press belts are supported by support strips.
  • Continuous double belt presses are for example from EP-A-544645 known. They are particularly used to make sheets or sheets Materials used that pass completely through the double belt press or are partially flowable.
  • plastics come as materials, such as B. Thermoplastics or thermoplastic phases passing through thermosets into question, which may contain fillers or reinforcing fibers. It is also possible to run a reinforcement web into the double belt press to let the materials on before entering the double belt press be applied, such as in the manufacture of with Glass fiber mats reinforced thermoplastics is the case.
  • the materials become the entry point of the double belt press in general fed without pressure. Only in the gap between the press belts is the material web exerted pressure.
  • the pressure is fluid pressure medium, such as. B. hydraulic liquids or compressed air, in Pressure chambers exerted on the side of the press belts facing away from the material.
  • the pressure chambers are from one side of the pressure plates, the respective press belt and annular seals between the pressure plate and Press belt formed.
  • the hydrostatic pressure of the pressure medium thus acts directly on the respective press belt, which this pressure as a membrane directly on the Material web in the press nip transfers, which in turn on the opposite Press belt supports.
  • the opposing pressure chambers of both Press belts must therefore be subjected to the same pressure.
  • the Material web thus begins its passage through the press without pressure, reaches in the press zone in zones of the respectively set pressures and leaves the press again without pressure.
  • the material web in the double belt press is in a flowable state, then wants to flow according to the pressure gradient.
  • the part of the press that is in Direction of tape travel before the zone of higher pressure it means that the flowable material wants to flow back against the direction of belt travel.
  • This can only be counteracted by toughness, being in the area the pressure build-up a relative speed between material and Press belts against the direction of transport, by means of which the pressure in the Material is built up and which ensures that a pressure before it is reached of the respective pressure zone.
  • This is contrary to the principle the isobaric press with the same pressure everywhere in a pressure zone should. Due to the premature build-up of pressure, the press belts put on Pressure chamber walls, seals or heat transfer bridges. This is particularly disadvantageous because the machine parts mentioned are not for Glide are designed under high pressure and excessive wear subject to.
  • EP-A-544.645 proposes the press belts to be supported with a roller bed each.
  • a flat one There is power, but only a line print on the support side Pressure lines between the belt and support rollers is transferred, which continues in these Hertzian pressure resulting in contact lines very close to this principle Limits.
  • Both the belt surfaces and the support rollers are covered by the Hertzian pressure in the contact lines constantly changing to close to the Yield stresses, which soon increases, especially with the press belts Leads to fatigue.
  • the press belts are subject to Run over the support rollers of a high bending stress, which leads to increased Wear of the press belts leads.
  • the invention accordingly relates to a double belt press for continuous Production of material webs (23), in the production of which the material passes through a flowable state, with a rigid press frame, with in Press frame rotatably mounted deflection drums (2.2 ', 5.5') with an upper and a lower, endless press belt, which is guided over the deflection drums (1,1 '), wherein between the opposite outer sides of the Press belts (1,1 ') the press zone is formed, in which the material web is guided and is pressed under a surface pressure and with pressure chambers (14, 14 ', 15, 15 '), the vertical pressure plates attached to the press frame (7,7 ', 10,10') and the inside of the press belts (1,1 '), in horizontal Direction through an inner (9.9 ', 12.12') and possibly an outer (8.8 ', 11, 11 ') each have a ring-shaped, self-contained sliding surface seal, between which an annular space (13,13 ') is formed, are limited and to generate the
  • the support strips extend across the entire width of the press belt.
  • the number of support strips and their width in the belt running direction is chosen so that the entire zone of the retroactive product pressure is supported. It depends on the type of product and the respective operating conditions, in particular on the transport speed of the press belts.
  • the volume flow of the pressure medium is adjusted independently of the pressure in such a way that there is a constant flow of the pressure medium from the supporting pressure chamber (20) between the press belt (1) and the side limit (19) into the surrounding pressure chamber (14) or into the surrounding annular space (13) .
  • the pressure medium flowing into the annular space (13) can, for example, be suctioned off and returned to the pressure medium circuit.
  • the gap between the press belt (1) and the side boundary (19) which arises due to the slight lifting of the press belt (1) when the fluid flow introduced into the supporting pressure chambers flows over it is of the order of magnitude of approximately a few hundredths of a millimeter.
  • the support strips are preferably designed at the same time as heat transfer strips, heating or cooling of the material web via the press belts enable.
  • the support strips preferably contain either holes with electrical heating elements, such as. B. heating elements, or channels with are flowed through a heat transfer medium.
  • FIG. 1 A possible arrangement of the support strips according to the invention in a double belt press with two pairs of pressure plates arranged one behind the other in the running direction is shown by way of example in FIG. 1.
  • the direction of work is through the Arrow marked.
  • the press is operated so that in the pressure chambers 15.15 'of the second pressure plate pair 10.10' there is a higher fluid pressure than in the pressure chambers 14, 14 'of the first pair of pressure plates 7, 7'.
  • Figure 2 shows a section through the lower support bar 17 '. It means 1 'that lower press belt, 7 'the lower first pressure plate, 14' the pressure chamber, 18 'the the press belt 1 'facing surface, 19' the projecting side boundary this area, 20 'is the supporting pressure chamber of the area delimited by 1', 18 'and 19' Band support strip 17 ', 21' the supply channel for the pressure medium and 22 'channels for Heating elements or fluid heat transfer media.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Forests & Forestry (AREA)
  • Press Drives And Press Lines (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Paper (AREA)

Abstract

Double-belt press for the continuous production of webs of material, the pressing belts being supported by means of supporting strips acted upon by fluid pressing agents. <IMAGE>

Description

Die Erfindung betrifft eine Doppelbandpresse mit hydrostatischer Bandstütze, bei der die Preßbänder durch Stützleisten abgestützt sind.The invention relates to a double belt press with a hydrostatic belt support, at the press belts are supported by support strips.

Kontinuierliche Doppelbandpressen sind beispielsweise aus der EP-A-544645 bekannt. Sie werden insbesondere zur Herstellung von Bahnen oder Platten aus Werkstoffen eingesetzt, die beim Durchgang durch die Doppelbandpresse ganz oder teilweise fließfähig sind. Als Werkstoffe kommen insbesondere Kunststoffe, wie z. B. Thermoplaste oder thermoplastische Phasen durchlaufende Duromere in Frage, die gegebenenfalls Füllstoffe oder Verstärkungsfasern enhalten können. Es ist auch möglich, eine Verstärkungsbahn in die Doppelbandpresse einlaufen zu lassen, auf die die Werkstoffe vor dem Einlauf in die Doppelbandpresse aufgebracht werden, wie dies beispielsweise bei der Herstellung von mit Glasfasermatten verstärkten Thermoplasten der Fall ist.Continuous double belt presses are for example from EP-A-544645 known. They are particularly used to make sheets or sheets Materials used that pass completely through the double belt press or are partially flowable. In particular, plastics come as materials, such as B. Thermoplastics or thermoplastic phases passing through thermosets into question, which may contain fillers or reinforcing fibers. It is also possible to run a reinforcement web into the double belt press to let the materials on before entering the double belt press be applied, such as in the manufacture of with Glass fiber mats reinforced thermoplastics is the case.

Die Werkstoffe werden der Einlaufstelle der Doppelbandpresse im allgemeinen drucklos zugeführt. Erst im Spalt zwischen den Preßbändern wird auf die Werkstoffbahn ein Druck ausgeübt. Der Druck wird bei isobaren Pressen durch ein fluides Druckmittel, wie z. B. hydraulische Flüssigkeiten oder Druckluft, in Druckkammern auf der dem Werkstoff abgewandten Seite der Preßbänder ausgeübt. Dabei werden die Druckkammern aus einer Seite der Druckplatten, dem jeweiligen Preßband sowie ringförmigen Dichtungen zwischen Druckplatte und Preßband gebildet. Der hydrostatische Druck des Druckmittels wirkt somit direkt auf das jeweilige Preßband, das diesen Druck als Membran unmittelbar auf die Werkstoffbahn im Preßspalt überträgt, die sich ihrerseits auf das gegenüberliegende Preßband abstützt. Die einander gegenüberliegenden Druckkammern beider Preßbänder müssen daher mit dem gleichen Druck beaufschlagt sein. Die Werkstoffbahn beginnt somit ihren Durchlauf durch die Presse drucklos, gelangt in der Preßzone in Zonen der jeweils eingestellten Drücke und verläßt die Presse wieder drucklos. The materials become the entry point of the double belt press in general fed without pressure. Only in the gap between the press belts is the material web exerted pressure. With isobaric presses, the pressure is fluid pressure medium, such as. B. hydraulic liquids or compressed air, in Pressure chambers exerted on the side of the press belts facing away from the material. The pressure chambers are from one side of the pressure plates, the respective press belt and annular seals between the pressure plate and Press belt formed. The hydrostatic pressure of the pressure medium thus acts directly on the respective press belt, which this pressure as a membrane directly on the Material web in the press nip transfers, which in turn on the opposite Press belt supports. The opposing pressure chambers of both Press belts must therefore be subjected to the same pressure. The Material web thus begins its passage through the press without pressure, reaches in the press zone in zones of the respectively set pressures and leaves the press again without pressure.

Ist die Werkstoffbahn in der Doppelbandpresse in fließfähigem Zustand, dann will sie gemäß dem Druckgradienten fließen. Für den Teil der Presse, der in Bandlaufrichtung vor der Zone eines höheren Druckes liegt, bedeutet das, daß der fließfähige Werkstoff entgegen der Bandlaufrichtung zurückströmen möchte. Dem kann nur durch Zähigkeitskräfte entgegengewirkt werden, wobei es im Bereich des Druckaufbaues eine Relativgeschwindigkeit zwischen Werkstoff und Preßbändern entgegen der Transportrichtung gibt, mittels derer der Druck im Werkstoff aufgebaut wird und die dafür sorgt, daß ein Druck schon vor dem Erreichen der jeweiligen Druckzone herrscht. Dies steht im Widerspruch zum Prinzip der isobaren Presse, bei der in einer Druckzone überall gleicher Druck herrschen soll. Durch den vorzeitigen Druckaufbau legen sich die Preßbänder an Druckkammerwände, Dichtungen oder Wärmeübertragungsbrücken an. Dies ist insbesondere deshalb nachteilig, da die genannten Maschinenteile nicht für Gleitung unter hohem Druck ausgelegt sind und dabei überhöhtem Verschleiß unterliegen.If the material web in the double belt press is in a flowable state, then wants to flow according to the pressure gradient. For the part of the press that is in Direction of tape travel before the zone of higher pressure, it means that the flowable material wants to flow back against the direction of belt travel. This can only be counteracted by toughness, being in the area the pressure build-up a relative speed between material and Press belts against the direction of transport, by means of which the pressure in the Material is built up and which ensures that a pressure before it is reached of the respective pressure zone. This is contrary to the principle the isobaric press with the same pressure everywhere in a pressure zone should. Due to the premature build-up of pressure, the press belts put on Pressure chamber walls, seals or heat transfer bridges. This is particularly disadvantageous because the machine parts mentioned are not for Glide are designed under high pressure and excessive wear subject to.

Zur Lösung des Problems wird in EP-A-544.645 vorgeschlagen, die Preßbänder mit je einem Rollenbett abzustützen. Da jedoch auf der Werkstoffseite eine flächenhafte Kraft herrscht, auf der Stützseite aber nur ein Liniendruck über die Drucklinien zwischen Band und Stützrollen übertragen wird, setzt die sich in diesen Berührungslinien ergebende Hertzsche Pressung diesem Prinzip sehr enge Grenzen. Sowohl die Bandoberflächen, als auch die Stützrollen werden durch die Hertzsche Pressung in den Berührungslinien ständig wechselnd bis nahe an die Streckgrenzen beansprucht, was insbesonders bei den Preßbändern alsbald zu Ermüdungserscheinungen führt. Darüber hinaus unterliegen die Preßbänder beim Lauf über die Stützrollen einer hohen Biegebeanspruchung, was zu erhöhtem Verschleiß der Preßbänder führt.To solve the problem, EP-A-544.645 proposes the press belts to be supported with a roller bed each. However, since on the material side a flat one There is power, but only a line print on the support side Pressure lines between the belt and support rollers is transferred, which continues in these Hertzian pressure resulting in contact lines very close to this principle Limits. Both the belt surfaces and the support rollers are covered by the Hertzian pressure in the contact lines constantly changing to close to the Yield stresses, which soon increases, especially with the press belts Leads to fatigue. In addition, the press belts are subject to Run over the support rollers of a high bending stress, which leads to increased Wear of the press belts leads.

Es stellte sich demnach die Aufgabe, die Preßbänder derart abzustützen, daß die genannten Nachteile bei der Abstützung mittels Stützrollen vermieden werden. Die Aufgabe konnte dadurch gelöst werden, daß die Preßbänder mit flächenförmigen Stützleisten, die mit fluiden Druckmitteln beaufschlagt sind, abgestützt werden. It was therefore the task of supporting the press belts in such a way that the mentioned disadvantages in support by means of support rollers can be avoided. The object could be achieved in that the press belts with flat Support strips which are acted upon by fluid pressure media will.

Gegenstand der Erfindung ist demnach eine Doppelbandpresse zur kontinuierlichen Herstellung von Werkstoffbahnen (23), bei deren Herstellung der Werkstoff einen fließfähigen Zustand durchläuft, mit einem starren Pressengestell, mit im Pressengestell drehbar gelagerten Umlenktrommeln (2,2', 5,5') mit einem oberen und einem unteren, über die Umlenktrommeln geführten, endlosen Preßband (1,1'), wobei zwischen den einander gegenüberliegenden Außenseiten der Preßbänder (1,1') die Preßzone gebildet wird, in der die Werkstoffbahn geführt und unter einem Flächendruck verpreßt wird, sowie mit Druckkammern (14,14', 15,15'), die in vertikaler Richtung von im Pressengestell befestigten Druckplatten (7,7', 10,10') und den Innenseiten der Preßbänder (1,1'), in horizontaler Richtung durch eine innere (9,9', 12,12') und gegebenenfalls eine äußere (8,8', 11,11') jeweils ringförmig in sich geschlossene Gleitflächendichtung, zwischen denen ein Ringraum (13,13') gebildet wird, begrenzt sind und zur Erzeugung des Flächendruckes auf die Preßbänder mit fluiden Druckmitteln beaufschlagbar sind, dadurch gekennzeichnet, daß in denjenigen Druckkammern, die mit einem niedrigeren Druck betrieben werden als die in Laufrichtung der Preßbänder jeweils folgende, sowie gegebenenfalls in dem dem Presseeinlauf zugewandten Teil des Ringraumes (13,13') vor der in Laufrichtung der Preßbänder ersten Druckkammer, Bandstützleisten (16,16', 17,17') angeordnet sind, die gegen die Druckplatte abgestützt sind und die mit ihrer dem Band zugewandten Fläche (18'), vorspringenden Seitenbegrenzungen (19') dieser Fläche und dem Band zusätzliche Stütz-Druckkammern (20') bilden, die mit einem konstanten Mengenstrom desselben fluiden Druckmittels beaufschlagt werden wie die Druckkammer in bzw. vor der sie angeordnet sind.The invention accordingly relates to a double belt press for continuous Production of material webs (23), in the production of which the material passes through a flowable state, with a rigid press frame, with in Press frame rotatably mounted deflection drums (2.2 ', 5.5') with an upper and a lower, endless press belt, which is guided over the deflection drums (1,1 '), wherein between the opposite outer sides of the Press belts (1,1 ') the press zone is formed, in which the material web is guided and is pressed under a surface pressure and with pressure chambers (14, 14 ', 15, 15 '), the vertical pressure plates attached to the press frame (7,7 ', 10,10') and the inside of the press belts (1,1 '), in horizontal Direction through an inner (9.9 ', 12.12') and possibly an outer (8.8 ', 11, 11 ') each have a ring-shaped, self-contained sliding surface seal, between which an annular space (13,13 ') is formed, are limited and to generate the Fluid pressure can be applied to the surface pressure on the press belts are characterized in that in those pressure chambers with a operate lower pressure than that in the running direction of the press belts in each case the following, and if necessary in the press inlet Part of the annular space (13,13 ') in front of the first in the direction of the press belts Pressure chamber, band support strips (16,16 ', 17,17') are arranged, which against the Pressure plate are supported and the surface facing the tape (18 '), projecting side boundaries (19') of this surface and the band form additional support pressure chambers (20 ') with a constant flow rate same fluid pressure medium are applied as the pressure chamber in or in front of which they are arranged.

Die Stützleisten erstrecken sich über die gesamte Breite des Preßbandes. Die Anzahl der Stützleisten und ihre Breite in Bandlaufrichtung wird so gewählt, daß die gesamte Zone des zurückwirkenden Produktdruckes abgestützt wird. Sie ist von der Produktart sowie von den jeweiligen Betriebsbedingungen abhängig, insbesondere von der Transportgeschwindigkeit der Preßbänder.
Der Mengenstrom des Druckmittels wird druckunabhängig derart eingestellt, daß ein ständiger Fluß des Druckmittels aus der Stütz-Druckkammer (20) zwischen Preßband (1) und Seitenbegrenzung (19) in die umgebende Druckkammer (14) bzw. in den umgebenden Ringraum (13) erfolgt. Dadurch gleiten die Preßbänder mit nur geringer Reibung auf dem fluiden Druckmittel und nicht auf festen Elementen. Das in den Ringraum (13) überfließende Druckmittel kann beispielsweise abgesaugt und in den Druckmittelkreislauf rückgeführt werden. Der durch das geringe Abheben des Preßbandes (1) beim Überströmen des in die Stütz-Druckkammern eingebrachten Fluidstroms entstehende Spalt zwischen Preßband (1) und Seitenbegrenzung (19) liegt in der Größenordnung von etwa einigen Hundertstel mm.The support strips extend across the entire width of the press belt. The number of support strips and their width in the belt running direction is chosen so that the entire zone of the retroactive product pressure is supported. It depends on the type of product and the respective operating conditions, in particular on the transport speed of the press belts.
The volume flow of the pressure medium is adjusted independently of the pressure in such a way that there is a constant flow of the pressure medium from the supporting pressure chamber (20) between the press belt (1) and the side limit (19) into the surrounding pressure chamber (14) or into the surrounding annular space (13) . As a result, the press belts slide with little friction on the fluid pressure medium and not on solid elements. The pressure medium flowing into the annular space (13) can, for example, be suctioned off and returned to the pressure medium circuit. The gap between the press belt (1) and the side boundary (19) which arises due to the slight lifting of the press belt (1) when the fluid flow introduced into the supporting pressure chambers flows over it is of the order of magnitude of approximately a few hundredths of a millimeter.

Die Stützleisten sind bevorzugt gleichzeitig als Wärmeübertragungsleisten ausgebildet, die über die Preßbänder eine Beheizung oder Kühlung der Werkstoffbahn ermöglichen. Die Stützleisten enthalten dazu bevorzugt entweder Bohrungen mit elektrischen Heizelementen, wie z. B. Heizstäben, oder Kanäle, die mit einem Wärmeträgermedium durchströmt sind.The support strips are preferably designed at the same time as heat transfer strips, heating or cooling of the material web via the press belts enable. For this purpose, the support strips preferably contain either holes with electrical heating elements, such as. B. heating elements, or channels with are flowed through a heat transfer medium.

Eine mögliche Anordnung der erfindungsgemäßen Stützleisten in einer Doppelbandpresse mit zwei in Laufrichtung hintereinander angeordneten Druckplattenpaaren ist beispielhaft in Figur 1 dargestellt. Die Arbeitsrichtung ist durch den Pfeil gekennzeichnet. Die Presse wird so betrieben, daß in den Druckkammern 15,15' des 2. Druckplattenpaares 10,10' ein höherer Fluiddruck herrscht als in den Druckkammern 14,14' des ersten Druckplattenpaares 7,7'. In Fig. 1 bedeuten 1 das obere, 1' das untere Preßband, 2,2' obere und untere einlaufseitige Umlenktrommel, 3,3' deren jeweilige Lagerung, 4,4' deren Bandspanneinrichtung, 5,5' die auslaufseitigen Umlenktrommeln, 6,6' deren Lagerung, 7,7' das erste Druckplattenpaar, 8,8' die äußeren der jeweils beiden ringförmigen Dichtungen des ersten Druckplattenpaares, 9,9' die entsprechenden inneren Dichtungen, 10,10' das zweite Druckplattenpaar, 11,11' die äußeren der jeweils beiden ringförmigen Dichtungen des zweiten Druckplattenpaares, 12,12' die entsprechenden inneren Dichtungen, 13,13' die Ringräume zwischen jeweils innerer und äußerer Dichtung, erster Druckplatte und Preßband, 14,14' die mit fluidem Druckmittel gefüllten Druckkammern des ersten Druckplattenpaares, 15,15' die mit fluidem Druckmittel gefüllten Druckkammern des zweiten Druckplattenpaares, 16,16' Stützleisten im jeweils einlaufseitigen Teil der Ringräume 13,13' und 17,17' Stützleisten an der der zweiten Preßplatte 10,10' zugewandten Seite der Druckkammern 14,14'. A possible arrangement of the support strips according to the invention in a double belt press with two pairs of pressure plates arranged one behind the other in the running direction is shown by way of example in FIG. 1. The direction of work is through the Arrow marked. The press is operated so that in the pressure chambers 15.15 'of the second pressure plate pair 10.10' there is a higher fluid pressure than in the pressure chambers 14, 14 'of the first pair of pressure plates 7, 7'. In Fig. 1 mean 1 the upper, 1 'the lower press belt, 2,2' upper and lower inlet side Deflection drum, 3.3 'their respective storage, 4.4' their belt tensioning device, 5.5 'the outlet-side deflection drums, 6.6' their storage, 7.7 'that first pair of pressure plates, 8,8 'the outer of the two annular seals of the first pair of pressure plates, 9.9 'the corresponding inner seals, 10,10 'the second pair of printing plates, 11,11' the outer of each two annular seals of the second pair of pressure plates, 12, 12 ' corresponding inner seals, 13, 13 'the annular spaces between each inner and outer seal, first pressure plate and press belt, 14, 14 'with fluid pressure medium-filled pressure chambers of the first pair of pressure plates, 15, 15 'the pressure chambers of the second pair of pressure plates filled with fluid pressure medium, 16, 16 'support strips in the inlet part of the annular spaces 13, 13 'and 17, 17' support strips on the side facing the second press plate 10, 10 ' Side of the pressure chambers 14, 14 '.

Figur 2 zeigt einen Schnitt durch die untere Stützleiste 17'. Es bedeuten 1' das untere Preßband, 7' die untere erste Druckplatte, 14' die Druckkammer, 18' die dem Preßband 1' zugewandte Fläche, 19' die vorspringende Seitenbegrenzung dieser Fläche, 20' die von 1', 18' und 19' begrenzte Stütz-Druckkammer der Bandstützleiste 17', 21' den Zuführkanal für das Druckmittel und 22' Kanäle für Heizelemente oder fluide Wärmeträger.Figure 2 shows a section through the lower support bar 17 '. It means 1 'that lower press belt, 7 'the lower first pressure plate, 14' the pressure chamber, 18 'the the press belt 1 'facing surface, 19' the projecting side boundary this area, 20 'is the supporting pressure chamber of the area delimited by 1', 18 'and 19' Band support strip 17 ', 21' the supply channel for the pressure medium and 22 'channels for Heating elements or fluid heat transfer media.

Claims (4)

  1. Double belt press for the continuous manufacture of material webs (23), during the manufacture of which the material passes through a free-flowing state, with a rigid press frame, with, mounted rotatably in the press frame, deflection drums (2, 2', 5, 5') with an upper and a lower endless pressing belt (1, 1') which is guided via the deflection drums, the pressing zone, in which the material web is guided and pressed under a surface pressure, being formed between the mutually opposite outer sides of the pressing belts (1, 1'), and with pressure chambers (14, 14', 15, 15') which are delimited in the vertical direction by pressure plates (7, 7', 10, 10') fastened in the press frame and by the inner sides of the pressing belts (1, 1') and in the horizontal direction by an inner (9, 9', 12, 12') and possibly an outer (8, 8', 11, 11') sliding-surface seal which are in each case annularly self-contained and between which an annular space (13, 13') is formed, and which chambers can be acted upon with fluid pressure media for generating the surface pressure on the pressing belts, characterized in that, in those pressure chambers which are operated with a lower pressure than those in each case following in the running direction of the pressing belts, and possibly in the part of the annular space (13, 13') facing the press entrance in front of the first pressure chamber in the running direction of the pressing belts, belt support strips (16, 16', 17, 17') are arranged, which are supported against the pressure plate and which, with their surface (18') facing the belt, projecting side delimitations (19') of this surface and the belt, form additional support pressure chambers (20') which are acted upon with a constant mass flow of the same fluid pressure medium as the pressure chamber in or in front of which they are arranged.
  2. Double belt press according to Claim 1, characterized in that the support strips are designed at the same time as heat-transmission strips.
  3. Double belt press according to Claim 2, characterized in that the support strips contain electric heating bars in bores.
  4. Double belt press according to Claim 2, characterized in that the support strips contain ducts, through which a heat-transfer medium flows.
EP94113602A 1993-09-14 1994-08-31 Double-band press with hydrostatic support for the band Expired - Lifetime EP0642917B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9430184T SI0642917T1 (en) 1993-09-14 1994-08-31 Double-band press with hydrostatic support for the band

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0185093A ATA185093A (en) 1993-09-14 1993-09-14 DOUBLE BELT PRESS WITH HYDROSTATIC BELT SUPPORT
AT1850/93 1993-09-14

Publications (2)

Publication Number Publication Date
EP0642917A1 EP0642917A1 (en) 1995-03-15
EP0642917B1 true EP0642917B1 (en) 1998-09-23

Family

ID=3522371

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94113602A Expired - Lifetime EP0642917B1 (en) 1993-09-14 1994-08-31 Double-band press with hydrostatic support for the band

Country Status (12)

Country Link
US (1) US5592874A (en)
EP (1) EP0642917B1 (en)
AT (2) ATA185093A (en)
CZ (1) CZ284211B6 (en)
DE (1) DE59406963D1 (en)
DK (1) DK0642917T3 (en)
ES (1) ES2122112T3 (en)
FI (1) FI944218A (en)
HU (1) HU213719B (en)
NO (1) NO307504B1 (en)
SI (1) SI0642917T1 (en)
SK (1) SK279295B6 (en)

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US6048436A (en) * 1997-02-07 2000-04-11 Kvaerner Panel Systems Gbmh Maschinen-Und Anlagenbau Continuously operating double-belt press

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US5399307A (en) * 1993-06-18 1995-03-21 Dalton; Robert E. Methods of compression molding two or more polytetrafluoroethylene resin layers
US6248245B1 (en) 1998-05-29 2001-06-19 Ashbrook Corporation Belt press with adjustable inlet guide
FI110763B (en) * 2001-11-21 2003-03-31 Raute Oyj Continuous pressure
US7381329B1 (en) * 2006-11-07 2008-06-03 William Harris Moss Belt press apparatus and method for high solids capture and high solids content
US7964105B2 (en) * 2008-08-07 2011-06-21 William Harris Moss Method for improving belt press dewatering
DE102008041832B4 (en) * 2008-09-05 2013-03-21 Airbus Operations Gmbh Device and method
SG177442A1 (en) 2009-07-02 2012-02-28 Du Pont Semiconductor manufacture component
US20110003140A1 (en) 2009-07-02 2011-01-06 E.I. Du Pont De Nemours And Company Oriented composite
CN102555260B (en) * 2012-01-18 2014-10-15 敦化市亚联机械制造有限公司 Double-steel tape continuous press with constant spacing and constant pressure control for producing composite material
US20130233778A1 (en) * 2012-03-08 2013-09-12 Mr. Willam H. Moss Apparatus improvements for belt press dewatering
US9869036B2 (en) * 2015-04-13 2018-01-16 Gkn Aerospace Services Structures Corporation Apparatus and method for controlling fabric web
US20240009886A1 (en) * 2019-10-18 2024-01-11 Välinge Innovation AB Methods and arrangements for continuous manufacture of building panels

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Also Published As

Publication number Publication date
CZ284211B6 (en) 1998-09-16
EP0642917A1 (en) 1995-03-15
NO943400L (en) 1995-03-15
HUT71027A (en) 1995-11-28
DK0642917T3 (en) 1999-02-08
SK279295B6 (en) 1998-09-09
FI944218A0 (en) 1994-09-13
NO307504B1 (en) 2000-04-17
CZ224394A3 (en) 1995-06-14
DE59406963D1 (en) 1998-10-29
ATA185093A (en) 2000-06-15
ATE171416T1 (en) 1998-10-15
ES2122112T3 (en) 1998-12-16
NO943400D0 (en) 1994-09-13
US5592874A (en) 1997-01-14
HU9402616D0 (en) 1994-11-28
HU213719B (en) 1997-09-29
FI944218A (en) 1995-03-15
SK110194A3 (en) 1995-04-12
SI0642917T1 (en) 1999-02-28

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