EP0630726A1 - Device for the continuous production of particle boards, fibre boards or the like - Google Patents

Device for the continuous production of particle boards, fibre boards or the like Download PDF

Info

Publication number
EP0630726A1
EP0630726A1 EP93810458A EP93810458A EP0630726A1 EP 0630726 A1 EP0630726 A1 EP 0630726A1 EP 93810458 A EP93810458 A EP 93810458A EP 93810458 A EP93810458 A EP 93810458A EP 0630726 A1 EP0630726 A1 EP 0630726A1
Authority
EP
European Patent Office
Prior art keywords
press
pressure
pressing
drum
shoe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP93810458A
Other languages
German (de)
French (fr)
Other versions
EP0630726B1 (en
Inventor
Eugen Schnyder
Rolf Lehmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
De Pretto Escher Wyss SRL
Original Assignee
Sulzer Escher Wyss AG
Escher Wyss AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to ES93202303T priority Critical patent/ES2121931T3/en
Priority to DE59308992T priority patent/DE59308992D1/en
Priority to ES93810458T priority patent/ES2121977T3/en
Priority to EP93202303A priority patent/EP0630725B1/en
Priority to DE59308993T priority patent/DE59308993D1/en
Priority to EP93810458A priority patent/EP0630726B1/en
Application filed by Sulzer Escher Wyss AG, Escher Wyss AG filed Critical Sulzer Escher Wyss AG
Priority to US08/249,517 priority patent/US5527422A/en
Priority to RU9494022263A priority patent/RU2066634C1/en
Priority to RU94028279/15A priority patent/RU2067930C1/en
Publication of EP0630726A1 publication Critical patent/EP0630726A1/en
Application granted granted Critical
Publication of EP0630726B1 publication Critical patent/EP0630726B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • B27N3/26—Moulding or pressing characterised by using continuously acting presses having a heated press drum and an endless belt to compress the material between belt and drum
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
    • Y10T156/1702—For plural parts or plural areas of single part
    • Y10T156/1712—Indefinite or running length work
    • Y10T156/1741—Progressive continuous bonding press [e.g., roll couples]

Definitions

  • the invention relates to a device for the continuous production of chipboard, fiberboard or the like. From a machined or defibrated, mixed with a pressure and / or thermosetting binder, lignocellulosic or cellulose-containing starting material with a heatable press drum and an endless metallic press belt guided over deflection rollers , which encloses the press drum on part of its circumference, forming a press section for the material to be compacted, which is heated above the curing temperature of the binder, the press belt being areal with a certain press pressure pressurizing device is provided.
  • Such arrangements are known for example from EP 195 128, EP 324 070, DE 25 49 560 or DE 38 00 513. They serve to process waste material in large quantities, such as wood waste, sugar cane bagasse, cotton stalk or the like, into chipboard or fiberboard or the like for use in the construction or furniture industry.
  • the lignocellulose- or cellulose-containing starting material is machined or dissolved in fibers and mixed with a suitable binder in a cleaned and largely dried form.
  • a suitable binder for example, copolymers of sodium lignosulphonate, melamine and formaldehyde, which gradually harden at a temperature of about 130 ° C., have proven to be particularly suitable for binding cellulose fibers and for forming solid chipboard (medium density fiber board).
  • the starting material mixed with the binder is introduced on the belt into the pressing section between the belt and the press drum rotating synchronously with it, where it is compressed under the action of pressure and temperature and gradually hardens before it is removed from the press drum and is cut into the desired plate size.
  • a press roller is provided on the input side, ie at the inlet of the starting material into the press zone, which has an almost line-like arrangement Press force with a pressing pressure of well over 100 bar on the belt. Adjoining this press roll on the input side is a zone in which the press pressure is generated only by the belt tension, and then another press roll with an almost linear force. As a rule, three to four rollers are provided here, the last roller serving to shape the plates produced shortly before the end of the setting process.
  • a disadvantage of these previously known methods is that, due to the sudden pressure loading and subsequent zones of low pressure, due to the multiple resilience of the fibers, insufficient strength, an undesirable density profile and an unfavorable distribution of hardness over the thickness of the plate result, and the amount of binder must be chosen to be unnecessarily large.
  • the top and bottom of the plates produced in this way have a relatively high hardness in a thin surface zone, while in the interior of the plate alternate softer with medium-hard zones. The cohesion of the plates is therefore often insufficient.
  • the surfaces are sanded for smoothing or profiling, the hard surface zones are ground away, so that the machined plates have an alternating and sometimes insufficient hardness on their surface.
  • a further disadvantage is that considerable forces can occur on the press drum bearings in the known devices. This requires the arrangement of the individual press rolls in such a way that the bearing forces of the press drum are at least partially compensated, the balance of forces being disturbed by adaptation to other operating conditions. Another disadvantage is that the press rollers deform the press drum so much that close tolerances can be maintained.
  • the object of the invention is to avoid the disadvantages of the prior art mentioned above and, in particular, to further develop an arrangement for the continuous production of chipboard, fiberboard or the like of the type mentioned in such a way that a pressing pressure is continuously maintained in the pressing section, while avoiding it or reduction of an input pressure peak and interruptions in order to achieve greater strength and a more homogeneous density and hardness distribution over the thickness of the chipboard or fiberboard, the material in the press section being heated in a simple manner via the curing temperature of the binder, and extreme Bearing forces can be avoided.
  • this object is achieved in that the pressing device is formed, at least on the entry side into the pressing section, by a pressure shoe with a hydraulic bearing surface which, together with the pressing drum, has a gradually narrowing inlet zone and a subsequent pressing section area which extends over a certain extent of the pressing drum forms with approximately uniform pressure and / or distance from the press drum.
  • the press drum can advantageously be provided with a jacket rotating about a non-rotatable support, which is supported with support devices relative to the support, so that bearing forces on the drum journals are substantially reduced or eliminated.
  • the system has a press drum 1, as well as an endless metallic press belt 2, for example a steel belt, which is guided continuously over part of the circumference of the press drum 1 and over several deflecting rollers 3, so that there is a press section over the belt part of the press drum 1 P forms.
  • the press drum 1 and the press belt 2 move synchronously with one another in the press section P.
  • a chute 4 is made of machined or fiberized lignocellulose or cellulose-containing material 5 mixed with a thermosetting binder by means of a conveyor belt 29 guided over deflection rollers 30 via a guide surface 28 on the upper side of the press belt 2 running horizontally here with a certain intended basis weight heaped up and runs on the press belt 2 into the entrance zone E of the press section P.
  • the material introduced is subjected to a press pressure and at the same time heated above the curing temperature of the binder. During the passage through the press section P, the material is compressed to the desired density and almost cured during the passage time.
  • the plate formed is subjected to a final pressing by means of a shaping roller 6 and receives the desired thickness profile or the required surface quality or structure.
  • the still endless chipboard or fiberboard 7 emerging from the outlet zone A is cut to the desired format in a cutting device 8 and deposited on a stack 9.
  • a pressure shoe 10 is provided at the entrance E into the press path P for forming the press path P between the press drum 1 and the press belt 2, for exerting the required press pressure and for heating the press belt 2 and the material layer 5 transported thereon. Its surface facing the press belt 2 is shaped in such a way that a gradually narrowing funnel-shaped gap is formed between the press belt 2 and the press drum 1 at the entrance E into the press zone P, while an almost uniform distance between the press belt 2 and the press drum 1 is formed in the subsequent press section P. is. In this case, an initially increasing pressing pressure arises at the inlet E, which is held in the subsequent pressing zone P almost at a certain predetermined pressure value during the entire cycle time via the pressure shoe 10.
  • the surface of the pressure shoe 10 facing the press belt 2 is advantageously provided with one or more hydrostatic bearing pockets 11 which are fed via pressure lines 12 with a lubricant under a certain pressure, for example a sufficiently temperature-resistant pressure oil.
  • a lubricant under a certain pressure, for example a sufficiently temperature-resistant pressure oil.
  • the pressure required in the press section P can be set at the same time via the pressure set in the storage pockets 11.
  • a preliminary heating of the press belt 2 takes place in that the front side 25 of the pressure shoe 10 has a preheating zone C, over which the belt 2 slides in front of the inlet zone E, where this is also provided with hydrostatic bearing pockets 26 fed with lines of hot pressure oil via lines 27.
  • a single sufficiently long pressure shoe 10 is often sufficient.
  • further pressure shoes 13, 14 and 15 of similar construction can be provided downstream of the input-side pressure shoe 10 in the pressing section P, which pressure shoes connect practically without interruption.
  • the storage pockets of these downstream press shoes 13, 14 and 15 can be supplied with pressure oil of different pressure, so that a gradually decreasing press pressure can be formed, e.g. with the pressure shoe 10 on the inlet side, a pressing pressure of 30-50 bar, which gradually decreases to 2-3 bar in the pressure shoes connected downstream.
  • the pressure shoes 10, as well as 13, 14, 15 can be arranged in a fixed position with respect to the press drum 1 with a predetermined distance, or can be adjustable against the press drum 1 by means of adjusting devices 23 in order to adjust the gap in the press path P, for example manually by means of spindles or automatically by means of electrical, magnetic, pneumatic or hydraulic control. In the latter case, they can be set to hydraulic pressure that can be set with pressure medium supplied pressure spaces can be movable, wherein the same pressure medium can be used as for the supply of the storage pockets 11th
  • a shaping roller 6 can be provided, which gives the already largely hardened chipboard 7 the desired shape and conditions, for example the desired thickness profile, by exerting a higher pressing pressure than that of the last pressure shoe 15.
  • This shaping roller is advantageously equipped with a jacket 17 which can be rotated about a carrier 16 which is clamped in a rotationally fixed manner and which is supported against the carrier 16 with one or more supporting elements 18 with adjustable supporting force in the pressing direction.
  • the support element 18 can be a continuous support strip or a plurality of support elements can be provided next to one another in the axial direction, with which a specific thickness profile can be produced.
  • the support elements 18 can be designed in a manner known per se as trailing hydrostatic support elements with individually controllable pressing force or in another known manner, or the entire press-side half space h is designed as a pressure chamber closed by sealing strips 24.
  • the shaping roller 6 can be adjustable in the drum circumferential direction in order to vary the curing distance.
  • the last pressure shoe can also serve as a shaped element, provided that it exerts a sufficient pressing pressure for shaping, without a shaping roller.
  • the press drum 1 can be designed in a known manner as a hollow roller, which is closed off at the side with lids carrying pins, but it is also advantageously provided with a rotatably clamped carrier 19 rotatable drum jacket 20, which also has at least one support element 21 against the carrier 19th is supported. Since there are no journal bearings and the forces are derived via the clamping of the carrier 19, the problem of compensating the bearing forces in this arrangement is completely eliminated.
  • the support elements 21 can in turn be designed in a known manner as trailing hydrostatic, supplied via lines 22 pressure controllable pressure, support elements which exert an adjustable support force on the jacket 20 and ensure an almost frictionless mounting of the rotating drum jacket 20 or as other known support elements or also as a rolling element.
  • the support elements 21 can be designed as a continuous support strip or as individually controllable support elements arranged next to one another in the axial direction.
  • a plurality of support strips or rows of support elements 21 can also be provided next to one another in the circumferential direction.
  • the sides of the press drum 1 are advantageously closed by flexible, for example bellows-type seals. Instead, however, the entire half space facing the pressing section P between the carrier 19 and the drum casing 10 or a partial space can be filled with pressurized fluid.
  • the pressure medium of the support elements 21 is advantageously heated, so that the drum jacket is above the curing temperature of the Binder is heated and thus a sufficiently intensive heating of the material 5 in the press section P is ensured on both sides.
  • the wall thickness of the jacket 20 of the press drum 1 can be significantly reduced, for example to the order of 5 cm, and the weight of the press drum from significantly more than 100 t to less than 50 t.
  • the reduction in wall thickness also improves heat transport and reduces energy consumption.
  • the targeted adjustment of the pressing pressure of the pressure shoes 10, 13, 14, 15 and the support elements 21 can prevent the drum jacket 20 from bending under the enormous pressing forces, so that the constancy of thickness of the chipboard 7 is significantly improved and the wear of the pressing belt 2 is reduced becomes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Abstract

Eine Anlage zur Herstellung von Spanplatten oder Faserplatten weist eine Presstrommel (1) und ein endloses Stahlband (2) auf, das die Trommel (1) auf einem Teil ihres Umfanges umschliesst und dort eine Pressstrecke (P) bildet, in der eingebrachtes, mit thermohärtendem Bindemittel versehenes, zerspantes oder zerfasertes Lignocellulose- oder Cellulose-Material durch Druck- und Temperatureinwirkung während ausreichend langer Zeit verdichtet und ausgehärtet wird. Der Pressdruck und die Aufheizung wird durch ausgedehnte Druckschuhe (10, 13, 14, 15) mit einer mit heissem Drucköl versorgte hydrostatische Lagertasche (11) erzeugt und über die erforderliche Zeit unter Vermeidung unerwünschter Druckspitzen gehalten, und kann bei mehreren Druckschuhen stufenweise herabgesetzt werden. Die Presstrommel (1) kann mit einem drehfesten Träger (19) und einem um diesen rotierbaren, mittels mit heissem Drucköl versorgter Stützelemente (21) abgestützten Mantel (20) versehen sein, so dass gleichzeitig der Mantel (20) aufgeheizt und einstellbare Presskräfte ohne Lagerbelastung erzeugt werden. <IMAGE>A plant for the production of chipboard or fiberboard has a press drum (1) and an endless steel band (2) which encloses the drum (1) over part of its circumference and forms a press section (P) there, in which is introduced, with thermosetting Binder-provided, machined or fiberized lignocellulose or cellulose material is compressed and cured for a sufficiently long time by exposure to pressure and temperature. The pressing pressure and the heating is generated by extended pressure shoes (10, 13, 14, 15) with a hydrostatic bearing pocket (11) supplied with hot pressure oil and kept for the required time while avoiding undesired pressure peaks, and can be reduced gradually with several pressure shoes. The press drum (1) can be provided with a non-rotatable support (19) and a jacket (20) rotatable about it and supported by means of hot pressure oil supplied with support elements (21), so that the jacket (20) is simultaneously heated and adjustable pressing forces without bearing load be generated. <IMAGE>

Description

Die Erfindung betrifft eine Einrichtung zur kontinuierlichen Herstellung von Spanplatten, Faserplatten oder dgl. aus einem zerspanten oder zerfaserten, mit einem druck- und/oder thermohärtenden Bindemittel vermischten, lignocellulose- oder cellulosehaltigen Ausgangsmaterial mit einer beheizbaren Presstrommel und einem endlosen, über Umlenkwalzen geführten metallischen Pressband, welches die Presstrommel auf einem Teil ihres Umfanges unter Bildung einer Pressstrecke für das zu verdichtende, über die Aushärtetemperatur des Bindemittels erwärmte Material umschliesst, wobei eine das Pressband flächenmässig mit einem bestimmten Press-Druck beaufschlagende Anpresseinrichtung vorgesehen ist.The invention relates to a device for the continuous production of chipboard, fiberboard or the like. From a machined or defibrated, mixed with a pressure and / or thermosetting binder, lignocellulosic or cellulose-containing starting material with a heatable press drum and an endless metallic press belt guided over deflection rollers , which encloses the press drum on part of its circumference, forming a press section for the material to be compacted, which is heated above the curing temperature of the binder, the press belt being areal with a certain press pressure pressurizing device is provided.

Solche Anordnungen sind beispielsweise aus EP 195 128, EP 324 070, DE 25 49 560 oder DE 38 00 513 bekannt. Sie dienen dazu, in grossen Mengen anfallendes Abfallmaterial, wie Holzabfälle, Zuckerrohr-Bagasse, Baumwollstengel oder dgl. zu Spanplatten oder Faserplatten oder dgl. zur Verwendung in der Bau- oder Möbelindustrie zu verarbeiten. Dazu wird das lignocellulose- oder cellulosehaltige Ausgangsmaterial zerspant oder in Fasern aufgelöst und in gereinigter und weitgehend getrockneter Form mit einem geeigneten Bindemittel versetzt. Als besonders geeignet zur Bindung von Cellulosefasern und zur Bildung fester Spanplatten (Medium Density Fibre-Board) haben sich beispielsweise Copolymere von Natriumlignosulphonat, Melamin und Formaldehyd erwiesen, welche bei einer Temperatur von etwa 130⁰C allmählich aushärten.Such arrangements are known for example from EP 195 128, EP 324 070, DE 25 49 560 or DE 38 00 513. They serve to process waste material in large quantities, such as wood waste, sugar cane bagasse, cotton stalk or the like, into chipboard or fiberboard or the like for use in the construction or furniture industry. For this purpose, the lignocellulose- or cellulose-containing starting material is machined or dissolved in fibers and mixed with a suitable binder in a cleaned and largely dried form. For example, copolymers of sodium lignosulphonate, melamine and formaldehyde, which gradually harden at a temperature of about 130 ° C., have proven to be particularly suitable for binding cellulose fibers and for forming solid chipboard (medium density fiber board).

Zur Bildung der Spanplatten oder Faserplatten wird das mit Bindemittel vermischte Ausgangsmaterial auf dem Band in die Pressstrecke zwischen dem Band und der synchron mit diesem umlaufenden Presstrommel eingebracht, wo sie unter Druck- und Temperatureinwirkung verdichtet wird und allmählich aushärtet, bevor sie von der Presstrommel abgenommen und in die gewünschte Plattengrösse zerschnitten wird.To form the chipboard or fiberboard, the starting material mixed with the binder is introduced on the belt into the pressing section between the belt and the press drum rotating synchronously with it, where it is compressed under the action of pressure and temperature and gradually hardens before it is removed from the press drum and is cut into the desired plate size.

Bei den bekannten Anordnungen ist eingangsseitig, d.h. am Einlauf des Ausgangsmaterials in die Presszone eine Presswalze vorgesehen, welche eine nahezu linienartige Presskraft mit einem Pressdruck von erheblich über 100 bar auf das Band ausübt. Anschliessend an diese eingangsseitige Presswalze folgt eine Zone, in welcher der Pressdruck lediglich durch die Bandspannung erzeugt wird, und anschliessend eine weitere Presswalze mit ebenfalls nahezu linienförmiger Kraftausübung. In der Regel sind hierbei drei bis vier Walzen vorgesehen, wobei die letzte Walze der Formgebung der hergestellten Platten kurz vor dem Ende des Abbindevorganges dient. Nachteilig an diesen vorbekannten Verfahren ist, dass infolge der schlagartigen Druckbeanspruchung und nachfolgenden Zonen geringen Druckes wegen des Mehrfach-Zurückfederns der Fasern eine ungenügende Festigkeit, ein unerwünschtes Dichteprofil und eine ungünstige Härteverteilung über die Dicke der Platte resultiert sowie die Bindemittelmenge unnötig gross gewählt werden muss. So weisen die Oberseite und die Unterseite der so erzeugten Platten eine relativ grosse Härte in einer dünnen Oberflächenzone auf, während im Inneren der Platte weichere mit mittelharten Zonen abwechseln. Der Zusammenhalt der Platten ist daher häufig ungenügend. Zudem werden beim Abschleifen der Oberflächen zwecks Glättung oder Profilierung die harten Oberflächenzonen weggeschliffen, so dass die bearbeiteten Platten an ihrer Oberfläche eine wechselnde und teilweise ungenügende Härte aufweisen.In the known arrangements, a press roller is provided on the input side, ie at the inlet of the starting material into the press zone, which has an almost line-like arrangement Press force with a pressing pressure of well over 100 bar on the belt. Adjoining this press roll on the input side is a zone in which the press pressure is generated only by the belt tension, and then another press roll with an almost linear force. As a rule, three to four rollers are provided here, the last roller serving to shape the plates produced shortly before the end of the setting process. A disadvantage of these previously known methods is that, due to the sudden pressure loading and subsequent zones of low pressure, due to the multiple resilience of the fibers, insufficient strength, an undesirable density profile and an unfavorable distribution of hardness over the thickness of the plate result, and the amount of binder must be chosen to be unnecessarily large. The top and bottom of the plates produced in this way have a relatively high hardness in a thin surface zone, while in the interior of the plate alternate softer with medium-hard zones. The cohesion of the plates is therefore often insufficient. In addition, when the surfaces are sanded for smoothing or profiling, the hard surface zones are ground away, so that the machined plates have an alternating and sometimes insufficient hardness on their surface.

Wie etwa in DE 38 00 513 beschrieben, ist es bereits versucht worden, eine grössere Festigkeit und eine bessere Homogenität der Dichte oder Härte über die Dicke der Spanplatte oder Faserplatte dadurch zu erreichen, dass zwischen den einzelnen Anpresswalzen Druckschalen mit hydrostatisch geschmierter Lauffläche vorgesehen sind, über die das Pressband mit geringer Reibung unter Ausübung eines Zwischendruckes hinweggleitet. Damit lässt sich in den Pressstreckenbereichen zwischen den Anpresswalzen ein Zwischendruck von bis zu 25 bar halten, wodurch die Eigenschaften der hergestellten Spanplatten oder Faserplatten bezüglich ihrer Dichte- oder Härteverteilung deutlich verbessert werden können. Da jedoch zwischen den Presswalzen und den Druckschuhen zwangsweise Lücken vorhanden sein müssen, in welchen der Druck auf einen sehr niedrigen Wert abfällt, so dass das Fasermaterial in diesen Zwischenbereichen nicht mehr unter Druck gehalten ist und zurückfedern kann, sind die Materialeigenschaften auch bei solchen Anordnungen noch nicht optimal.As described, for example, in DE 38 00 513, attempts have already been made to achieve greater strength and better homogeneity of the density or hardness over the thickness of the chipboard or fiberboard in that between the individual pressure rollers Pressure shells with hydrostatically lubricated tread are provided, over which the press belt slides with little friction while exerting an intermediate pressure. This means that an intermediate pressure of up to 25 bar can be maintained in the press section areas between the pressure rollers, which means that the properties of the chipboard or fiberboard produced in terms of their density or hardness distribution can be significantly improved. However, since there must be gaps between the press rollers and the pressure shoes, in which the pressure drops to a very low value, so that the fiber material in these intermediate areas is no longer kept under pressure and can spring back, the material properties are still in such arrangements not optimal.

Ein weiterer Nachteil ist, dass bei den bekannten Einrichtungen die Anpresswalzen nicht hinreichend beheizbar sind um genügend Wärme an das Material zu übertragen, mit der Folge, dass das Band mit zusätzlichen Heizvorrichtungen auf die erforderliche Temperatur gebracht werden muss.Another disadvantage is that in the known devices the pressure rollers cannot be heated sufficiently to transfer sufficient heat to the material, with the result that the belt has to be brought to the required temperature with additional heating devices.

Weiterhin ist nachteilig, dass bei den bekannten Einrichtungen erhebliche Kräfte an den Presstrommel-Lagern auftreten können. Dies erfordert die Anordnung der einzelnen Presswalzen derart, dass die Lagerkräfte der Presstrommel zumindest zum Teil kompensiert werden, wobei durch eine Anpassung an andere Betriebsbedingungen das Kräftegleichgewicht gestört würde. Weiter ist nachteilig, dass die Presswalzen die Presstrommel so stark verformen, dass die Einhaltung enger Toleranzen möglich ist.A further disadvantage is that considerable forces can occur on the press drum bearings in the known devices. This requires the arrangement of the individual press rolls in such a way that the bearing forces of the press drum are at least partially compensated, the balance of forces being disturbed by adaptation to other operating conditions. Another disadvantage is that the press rollers deform the press drum so much that close tolerances can be maintained.

Die Erfindung setzt sich die Aufgabe, die vorstehend angeführten Nachteile des Standes der Technik zu vermeiden und insbesondere eine Anordnung zur kontinuierlichen Herstellung von Spanplatten, Faserplatten oder dgl. der eingangs genannten Art derart weiterzubilden, dass in der Pressstrecke kontinuierlich ein Pressdruck aufrechterhalten wird, unter Vermeidung oder Reduzierung einer eingangsseitigen Druckspitze und von Unterbrüchen, um eine grössere Festigkeit und eine homogenere Dichte- und Härteverteilung über die Dicke der Spanplatte oder Faserplatte zu erreichen, wobei das Material in der Pressstrecke auf einfache Weise über die Aushärtetemperatur des Bindemittels erhitzt wird, und wobei extreme Lagerkräfte vermieden werden.The object of the invention is to avoid the disadvantages of the prior art mentioned above and, in particular, to further develop an arrangement for the continuous production of chipboard, fiberboard or the like of the type mentioned in such a way that a pressing pressure is continuously maintained in the pressing section, while avoiding it or reduction of an input pressure peak and interruptions in order to achieve greater strength and a more homogeneous density and hardness distribution over the thickness of the chipboard or fiberboard, the material in the press section being heated in a simple manner via the curing temperature of the binder, and extreme Bearing forces can be avoided.

Erfindungsgemäss wird diese Aufgabe dadurch gelöst, dass die Presseinrichtung zumindest an der Eingangsseite in die Pressstrecke durch einen Druckschuh mit hydraulischer Lagerfläche gebildet wird, welcher mit der Presstrommel eine sich allmählich verengende Einlaufzone und eine anschliessende, sich über einen gewissen Umfang der Presstrommel erstreckenden Pressstrecken-Bereich mit angenähert gleichförmigem Pressdruck und/oder Abstand von der Presstrommel bildet.According to the invention, this object is achieved in that the pressing device is formed, at least on the entry side into the pressing section, by a pressure shoe with a hydraulic bearing surface which, together with the pressing drum, has a gradually narrowing inlet zone and a subsequent pressing section area which extends over a certain extent of the pressing drum forms with approximately uniform pressure and / or distance from the press drum.

Bei einer vorteilhaften Weiterbildung der Erfindung sind unmittelbar an den eingangsseitigen Druckschuh weitere hydraulische Druckschuhe vorgesehen, welche einen sukzessive stufenweise abnehmenden Druck auf das Pressband ausüben. Anschliessend daran kann an der Austrittsseite der Platten eine Formgebungswalze mit über die Breite steuerbarer Linienkraft vorgesehen sein, um kurz vor Ende des Aushärtungsvorganges das gewünschte Dickenprofil oder eine vorgesehene Oberflächenform zu erreichen.In an advantageous development of the invention, further hydraulic pressure shoes are provided directly on the pressure shoe on the input side, which pressure shoes gradually exert a gradually decreasing pressure on the press belt. Subsequently, a shaping roller with line force that can be controlled over the width can be provided on the exit side of the plates shortly before the end of the curing process to achieve the desired thickness profile or an intended surface shape.

Die Presstrommel kann mit Vorteil mit einem um einen drehfesten Träger rotierenden Mantel versehen sein, welcher gegenüber dem Träger mit Stützvorrichtungen abgestützt ist, so dass Lagerkräfte an den Trommelzapfen wesentlich reduziert sind oder entfallen.The press drum can advantageously be provided with a jacket rotating about a non-rotatable support, which is supported with support devices relative to the support, so that bearing forces on the drum journals are substantially reduced or eliminated.

Die Erfindung wird anhand des in der beiliegenden Figur dargestellten Ausführungsbeispieles einer Anlage zur Herstellung von Spanplatten, Faserplatten oder dgl. näher beschrieben.The invention is described in more detail with reference to the embodiment of a plant for the production of chipboard, fiberboard or the like shown in the accompanying figure.

Die Anlage weist eine Presstrommel 1 auf, sowie ein endloses metallisches Pressband 2, beispielsweise ein Stahlband, welches über einen Teil des Umfanges der Presstrommel 1 und über mehrere Umlenkwalzen 3 kontinuierlich geführt ist, so dass es über den Umschlingungsteil der Presstrommel 1 mit dieser eine Pressstrecke P bildet. Die Presstrommel 1 und das Pressband 2 bewegen sich in der Pressstrecke P synchron miteinander.The system has a press drum 1, as well as an endless metallic press belt 2, for example a steel belt, which is guided continuously over part of the circumference of the press drum 1 and over several deflecting rollers 3, so that there is a press section over the belt part of the press drum 1 P forms. The press drum 1 and the press belt 2 move synchronously with one another in the press section P.

Aus einem Schüttkasten 4 wird zerspantes oder zerfasertes lignocellulose- oder cellulosehaltiges, mit einem thermohärtenden Bindemittel vermischtes Material 5 vermittels eines über Umlenkrollen 30 geführten Förderbandes 29 über eine Führungsfläche 28 auf die Oberseite des hier horizontal verlaufenden Pressbandes 2 mit einem bestimmten vorgesehenen Flächengewicht aufgeschüttet und läuft auf dem Pressband 2 in die Eingangszone E der Pressstrecke P. In der Pressstrecke P wird das eingebrachte Material einem Pressdruck ausgesetzt und gleichzeitig über die Aushärtungstemperatur des Bindemittels erhitzt. Während des Durchlaufs durch die Pressstrecke P wird das Material auf die gewünschte Dichte komprimiert und während der Durchlaufzeit nahezu ausgehärtet. Am Ende F der Pressstrecke P kurz vor dem Auslauf A wird die gebildete Platte mittels einer Formwalze 6 einer Schlusspressung unterworfen und erhält das gewünschte Dickenprofil bzw. die erforderliche Oberflächengüte bzw. Struktur. Die aus der Auslaufzone A austretende, noch endlose Spanplatte bzw. Faserplatte 7 wird in einer Schneidevorrichtung 8 auf das gewünschte Format zurechtgeschnitten und auf einem Stapel 9 deponiert.A chute 4 is made of machined or fiberized lignocellulose or cellulose-containing material 5 mixed with a thermosetting binder by means of a conveyor belt 29 guided over deflection rollers 30 via a guide surface 28 on the upper side of the press belt 2 running horizontally here with a certain intended basis weight heaped up and runs on the press belt 2 into the entrance zone E of the press section P. In the press section P, the material introduced is subjected to a press pressure and at the same time heated above the curing temperature of the binder. During the passage through the press section P, the material is compressed to the desired density and almost cured during the passage time. At the end F of the press section P shortly before the outlet A, the plate formed is subjected to a final pressing by means of a shaping roller 6 and receives the desired thickness profile or the required surface quality or structure. The still endless chipboard or fiberboard 7 emerging from the outlet zone A is cut to the desired format in a cutting device 8 and deposited on a stack 9.

Zur Bildung der Pressstrecke P zwischen Presstrommel 1 und Pressband 2, sowie zur Ausübung des erforderlichen Pressdruckes sowie zur Aufheizung des Pressbandes 2 und der darauf transportierten Materialschicht 5 ist am Eingang E in die Pressstrecke P ein Druckschuh 10 vorgesehen. Dessen dem Pressband 2 zugekehrte Oberfläche ist so geformt, dass am Eingang E in die Presszone P ein sich allmählich verengender trichterförmiger Spalt zwischen Pressband 2 und Presstrommel 1 gebildet ist, während in der anschliessenden Pressstrecke P ein nahezu gleichförmiger Abstand zwischen Pressband 2 und Presstrommel 1 gebildet ist. Dabei entsteht am Eingang E ein zunächst ansteigender Pressdruck, welcher in der anschliessenden Presszone P nahezu auf einem bestimmten vorgegebenen Druckwert während der gesamten Durchlaufzeit über den Druckschuh 10 gehalten wird.A pressure shoe 10 is provided at the entrance E into the press path P for forming the press path P between the press drum 1 and the press belt 2, for exerting the required press pressure and for heating the press belt 2 and the material layer 5 transported thereon. Its surface facing the press belt 2 is shaped in such a way that a gradually narrowing funnel-shaped gap is formed between the press belt 2 and the press drum 1 at the entrance E into the press zone P, while an almost uniform distance between the press belt 2 and the press drum 1 is formed in the subsequent press section P. is. In this case, an initially increasing pressing pressure arises at the inlet E, which is held in the subsequent pressing zone P almost at a certain predetermined pressure value during the entire cycle time via the pressure shoe 10.

Im Vergleich zu Anordnungen mit einer eingangsseitigen Presswalze, welche die Presstrommel 1 im wesentlichen nahezu linienförmig berührt und somit nur eine kurzzeitige Druckspitze am Eingang in den Pressspalt erzeugt, nach welchem der Druck wieder auf einen tiefen Wert abfällt und eine Rückfederung der Fasern ermöglicht, wird bei der beschriebenen Anordnung der Druck in der Pressstrecke P über eine wesentlich längere Zeit ohne unerwünschte Druckspitzen und Unterbrüche aufrechterhalten, mit der Folge, dass die auf diese Weise erzeugten Spanplatten eine deutlich bessere Homogenität bezüglich ihrer Dichte- und Härteverteilung und einen besseren Faserzusammenhalt zeigen, bei reduziertem Bindemittelgehalt und -Bedarf.In comparison to arrangements with an input-side press roller, which touches the press drum 1 essentially in a line shape and thus only generates a brief pressure peak at the entrance to the press nip, after which the pressure drops again to a low value and enables the fibers to spring back, at maintain the described arrangement of the pressure in the press section P for a substantially longer time without undesired pressure peaks and interruptions, with the result that the chipboard produced in this way has a significantly better homogeneity with regard to its density and hardness distribution and better fiber cohesion, with reduced Binder content and requirements.

Die dem Pressband 2 zugekehrte Oberfläche des Druckschuhes 10 ist mit Vorteil mit einer oder mehreren hydrostatischen Lagertaschen 11 versehen, welche über Druckleitungen 12 mit einem Schmiermittel unter bestimmtem Druck, beispielsweise einem hinreichend temperaturfesten Drucköl gespiesen sind. Hierdurch ist das Pressband 2 auf der Oberfläche des Druckschuhes 10 hydrostatisch gelagert und vermag nahezu reibungsfrei über die Druckschuh-Oberfläche zu gleiten. Ueber den in den Lagertaschen 11 eingestellten Druck kann gleichzeitig der in der Pressstrecke P erforderliche Pressdruck eingestellt werden. Ausserdem ist es von Vorteil, das zugeführte Drucköl auf eine Temperatur oberhalb der Aushärtungstemperatur des Bindemittels z.B. auf über 150oC, aufzuheizen, so dass damit auch das Pressband 2 beim Gleiten über die Lagertaschen 11 und das darauf transportierte Material 5 über der Aushärtungstemperatur gehalten wird. Eine vorgängige Aufheizung des Pressbandes 2 erfolgt dadurch, dass die Vorderseite 25 des Druckschuhes 10 eine Vorheizzone C aufweist, über die das Band 2 vor der Einlaufzone E hinweggleitet, wo diese ebenfalls mit hydrostatischen, über Leitungen 27 mit heissem Drucköl gespiesenen Lagertaschen 26 versehen ist.The surface of the pressure shoe 10 facing the press belt 2 is advantageously provided with one or more hydrostatic bearing pockets 11 which are fed via pressure lines 12 with a lubricant under a certain pressure, for example a sufficiently temperature-resistant pressure oil. As a result, the press belt 2 is mounted hydrostatically on the surface of the pressure shoe 10 and is able to slide over the pressure shoe surface almost without friction. The pressure required in the press section P can be set at the same time via the pressure set in the storage pockets 11. In addition, it is advantageous to heat the supplied pressure oil to a temperature above the curing temperature of the binder, for example, to about 150 o C, so that thus also the press belt 2 while sliding over the bearing pockets 11 and 5 thereafter transported material over the curing temperature is held. A preliminary heating of the press belt 2 takes place in that the front side 25 of the pressure shoe 10 has a preheating zone C, over which the belt 2 slides in front of the inlet zone E, where this is also provided with hydrostatic bearing pockets 26 fed with lines of hot pressure oil via lines 27.

Im Prinzip genügt häufig ein einziger genügend langer Druckschuh 10. Mit Vorteil können jedoch dem eingangsseitigen Druckschuh 10 in der Pressstrecke P nachgeschaltet weitere analog aufgebaute Druckschuhe 13, 14 und 15 vorgesehen sein, welche sich aneinander praktisch ohne Unterbruch anschliessen. Die Lagertaschen dieser nachgeschalteten Pressschuhe 13, 14 und 15 können mit Drucköl unterschiedlichen Druckes gespiesen sein, so dass sich ein sukzessive stufenweise abnehmender Pressdruck bilden lässt, z.B. beim eingangsseitigen Druckschuh 10 ein Pressdruck von 30 - 50 bar, welcher bei den nachgeschalteten Druckschuhen stufenweise auf 2 - 3 bar abnimmt.In principle, a single sufficiently long pressure shoe 10 is often sufficient. Advantageously, however, further pressure shoes 13, 14 and 15 of similar construction can be provided downstream of the input-side pressure shoe 10 in the pressing section P, which pressure shoes connect practically without interruption. The storage pockets of these downstream press shoes 13, 14 and 15 can be supplied with pressure oil of different pressure, so that a gradually decreasing press pressure can be formed, e.g. with the pressure shoe 10 on the inlet side, a pressing pressure of 30-50 bar, which gradually decreases to 2-3 bar in the pressure shoes connected downstream.

Die Druckschuhe 10, sowie 13, 14, 15 können bezüglich der Presstrommel 1 in einer ortsfesten Position angeordnet sein mit vorgegebenem Abstand, oder mittels Verstelleinrichtungen 23 gegen die Presstrommel 1 zwecks Einstellung des Spaltes in der Pressstrecke P in Pressrichtung verstellbar sein, z.B. manuell mittels Spindeln oder automatisch mittels elektrischer, magnetischer, pneumatischer oder hydraulischer Steuerung. Im letzteren Fall können sie auf hydraulischen, mit Druckmittel einstellbaren Druckes versorgten Druckräumen beweglich sein, wobei auch dasselbe Druckmittel verwendet werden kann, wie für die Versorgung der Lagertaschen 11.The pressure shoes 10, as well as 13, 14, 15 can be arranged in a fixed position with respect to the press drum 1 with a predetermined distance, or can be adjustable against the press drum 1 by means of adjusting devices 23 in order to adjust the gap in the press path P, for example manually by means of spindles or automatically by means of electrical, magnetic, pneumatic or hydraulic control. In the latter case, they can be set to hydraulic pressure that can be set with pressure medium supplied pressure spaces can be movable, wherein the same pressure medium can be used as for the supply of the storage pockets 11th

Am Schluss der Pressstrecke P kann eine Formwalze 6 vorgesehen sein, welche der schon weitgehend ausgehärteten Spanplatte 7 durch Ausübung eines höheren Pressdruckes als den des letzten Druckschuhes 15 definitiv die gewünschte Form gibt und konditioniert, beispielsweise das angestrebte Dickenprofil. Mit Vorteil ist diese Formwalze mit einem um einen drehfest eingespannten Träger 16 rotierbaren Mantel 17 ausgerüstet, welcher mit einem oder mehreren Stützelementen 18 mit einstellbarer Stützkraft in Pressrichtung gegen den Träger 16 abgestützt ist. Das Stützelement 18 kann eine durchgehende Stützleiste sein oder es können in Achsenrichtung nebeneinander mehrere Stützelemente vorgesehen sein, mit welchen ein bestimmtes Dickenprofil hergestellt werden kann. Dabei können die Stützelemente 18 in an sich bekannter Weise als nachfahrende hydrostatische Stützelemente mit individuell steuerbarer Presskraft ausgebildet sein oder in anderer bekannter Weise, oder der gesamte pressseitige Halbraum h ist als durch Dichtleisten 24 abgeschlossene Druckkammer ausgebildet. Die Formwalze 6 kann in Trommelumfangsrichtung verstellbar sein, um die Aushärtestrecke zu variieren. Jedoch kann auch der letzte Druckschuh als Formelement dienen, sofern dieser einen zur Formgebung ausreichenden Pressdruck ausübt, unter Verzicht auf eine Formwalze.At the end of the press section P, a shaping roller 6 can be provided, which gives the already largely hardened chipboard 7 the desired shape and conditions, for example the desired thickness profile, by exerting a higher pressing pressure than that of the last pressure shoe 15. This shaping roller is advantageously equipped with a jacket 17 which can be rotated about a carrier 16 which is clamped in a rotationally fixed manner and which is supported against the carrier 16 with one or more supporting elements 18 with adjustable supporting force in the pressing direction. The support element 18 can be a continuous support strip or a plurality of support elements can be provided next to one another in the axial direction, with which a specific thickness profile can be produced. The support elements 18 can be designed in a manner known per se as trailing hydrostatic support elements with individually controllable pressing force or in another known manner, or the entire press-side half space h is designed as a pressure chamber closed by sealing strips 24. The shaping roller 6 can be adjustable in the drum circumferential direction in order to vary the curing distance. However, the last pressure shoe can also serve as a shaped element, provided that it exerts a sufficient pressing pressure for shaping, without a shaping roller.

Die Presstrommel 1 kann zwar in bekannter Weise als Hohlwalze ausgebildet sein, welche seitlich mit Zapfen tragenden Deckeln abgeschlossen ist, jedoch ist sie mit Vorteil ebenfalls mit einem drehfest eingespannten Träger 19 rotierbaren Trommelmantel 20 versehen, welcher ebenfalls mit wenigstens einem Stützelement 21 gegen den Träger 19 abgestützt ist. Da keine Zapfenlager vorhanden sind und die Kräfte über die Einspannung des Trägers 19 abgeleitet werden, entfällt das Problem der Kompensation der Lagerkräfte bei dieser Anordnung vollständig. Die Stützelemente 21 können wiederum in bekannter Weise als nachfahrende hydrostatische, über Leitungen 22 mit Druckmittel steuerbaren Druckes versorgte, Stützelemente ausgebildet sein, welche eine einstellbare Stützkraft auf den Mantel 20 ausüben und eine nahezu reibungsfreie Lagerung des rotierenden Trommelmantels 20 gewährleisten oder als andere bekannte Stützelemente bzw. auch als Walzkörper. Auch hier können die Stützelemente 21 als durchgehende Stützleiste oder als in Achsenrichtung nebeneinander angeordnete, individuell ansteuerbare Stützelemente ausgebildet sein. Auch in Umfangsrichtung können nebeneinander mehrere Stützleisten oder Reihen von Stützelementen 21 vorgesehen sein. Die Seiten der Presstrommel 1 sind mit Vorteil durch flexible z.B. balgartige Dichtungen abgeschlossen. Stattdessen kann jedoch auch der gesamte der Pressstrecke P zugekehrte Halbraum zwischen Träger 19 und Trommelmantel 10 oder ein Teilraum mit Druckfluid gefüllt sein. Das Druckmittel der Stützelemente 21 ist mit Vorteil geheizt, so dass der Trommelmantel über die Aushärtungstemperatur des Bindemittels erhitzt wird und somit eine genügend intensive beidseitige Erhitzung des Materials 5 in der Pressstrecke P gewährleistet ist. Zudem kann bei dieser Ausführung die Wandstärke des Mantels 20 der Presstrommel 1 wesentlich reduziert werden, z.B. in die Grössenordnung von 5 cm, und das Gewicht der Presstrommel von deutlich mehr als 100 t auf weniger als 50 t. Zudem wird durch die Reduktion der Wandstärke der Wärmetransport verbessert und der Energiebedarf vermindert. Durch die gezielte Einstellung des Pressdruckes der Druckschuhe 10, 13, 14, 15 und der Stützelemente 21 kann vermieden werden, dass sich der Trommelmantel 20 unter den enormen Presskräften durchbiegt, so dass die Dickenkonstanz der Spanplatte 7 wesentlich verbessert und der Verschleiss des Pressbandes 2 vermindert wird.The press drum 1 can be designed in a known manner as a hollow roller, which is closed off at the side with lids carrying pins, but it is also advantageously provided with a rotatably clamped carrier 19 rotatable drum jacket 20, which also has at least one support element 21 against the carrier 19th is supported. Since there are no journal bearings and the forces are derived via the clamping of the carrier 19, the problem of compensating the bearing forces in this arrangement is completely eliminated. The support elements 21 can in turn be designed in a known manner as trailing hydrostatic, supplied via lines 22 pressure controllable pressure, support elements which exert an adjustable support force on the jacket 20 and ensure an almost frictionless mounting of the rotating drum jacket 20 or as other known support elements or also as a rolling element. Here, too, the support elements 21 can be designed as a continuous support strip or as individually controllable support elements arranged next to one another in the axial direction. A plurality of support strips or rows of support elements 21 can also be provided next to one another in the circumferential direction. The sides of the press drum 1 are advantageously closed by flexible, for example bellows-type seals. Instead, however, the entire half space facing the pressing section P between the carrier 19 and the drum casing 10 or a partial space can be filled with pressurized fluid. The pressure medium of the support elements 21 is advantageously heated, so that the drum jacket is above the curing temperature of the Binder is heated and thus a sufficiently intensive heating of the material 5 in the press section P is ensured on both sides. In addition, in this embodiment, the wall thickness of the jacket 20 of the press drum 1 can be significantly reduced, for example to the order of 5 cm, and the weight of the press drum from significantly more than 100 t to less than 50 t. The reduction in wall thickness also improves heat transport and reduces energy consumption. The targeted adjustment of the pressing pressure of the pressure shoes 10, 13, 14, 15 and the support elements 21 can prevent the drum jacket 20 from bending under the enormous pressing forces, so that the constancy of thickness of the chipboard 7 is significantly improved and the wear of the pressing belt 2 is reduced becomes.

Claims (10)

Die Erfindung betrifft eine Einrichtung zur kontinuierlichen Herstellung von Spanplatten, Faserplatten oder dgl. aus einem zerspanten oder zerfaserten, mit einem druck- und/oder thermohärtenden Bindemittel vermischten, lignocellulose- oder cellulosehaltigem Ausgangsmaterial (5) mit einer beheizbaren Presstrommel (1) und einem endlosen, über Umlenkwalzen geführten metallischen Pressband (2), welches die Presstrommel (1) auf einem Teil ihres Umfanges unter Bildung einer Pressstrecke (P) für das zu verdichtende, über die Aushärtetemperatur des Bindemittels erwärmte Material umschliesst, wobei wenigstens eine das Pressband (1) flächenmässig mit einem bestimmten Press-Druck beaufschlagende Anpresseinrichtung (10, 13, 14, 15) vorgesehen ist, dadurch gekennzeichnet, dass die Presseinrichtung zumindest an der Eingangsseite in die Pressstrecke durch einen Druckschuh (10) mit hydraulischer Lagerfläche (11) gebildet wird, welcher mit der Presstrommel (1) eine sich allmählich verengende Einlaufzone (E) und eine anschliessende, sich über einen gewissen Umfang der Presstrommel (1) erstreckenden Pressstrecken-Bereich (P) mit angenähert gleichförmigem Pressdruck und/oder Abstand von der Presstrommel bildet.The invention relates to a device for the continuous production of chipboard, fibreboard or the like. From a machined or shredded, mixed with a pressure and / or thermosetting binder, lignocellulose or cellulose-containing starting material (5) with a heatable press drum (1) and an endless one Metallic press belt (2) guided over deflection rollers, which surrounds the press drum (1) over part of its circumference, forming a press section (P) for the material to be compressed, which is heated above the curing temperature of the binder, at least one of which press belt (1) A pressing device (10, 13, 14, 15) with a specific pressing pressure in terms of area is provided, characterized in that the pressing device is formed at least on the input side into the pressing section by a pressure shoe (10) with a hydraulic bearing surface (11), which with the press drum (1) a gradually narrowing Inlet zone (E) and a subsequent pressing section area (P), which extends over a certain circumference of the pressing drum (1), forms an approximately uniform pressing pressure and / or distance from the pressing drum. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, dass in der Pressstrecke (P) unmittelbar anschliessend an den Druckschuh (10) wenigstens ein weiterer Druckschuh (13, 14, 15) mit hydraulischer Lagerfläche mit einstellbarem Pressdruck angeordnet ist.Device according to claim 1, characterized in that at least one further pressure shoe (13, 14, 15) with a hydraulic bearing surface with an adjustable pressing pressure is arranged in the pressing section (P) immediately following the pressure shoe (10). Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der oder die Druckschuhe mittels einer Verstelleinrichtung (23) in ihrer Pressrichtung gegenüber der Presstrommel (1) verstellbar sind.Device according to claim 1 or 2, characterized in that the pressure shoe or shoes can be adjusted in their pressing direction with respect to the press drum (1) by means of an adjusting device (23). Einrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Verstelleinrichtung (23) einen mit Druckmittel versorgten Druckraum aufweisen, auf dem der Druckschuh (10, 13, 14, 15) beweglich ist.Device according to claim 3, characterized in that the adjusting device (23) has a pressure chamber supplied with pressure medium, on which the pressure shoe (10, 13, 14, 15) is movable. Einrichtung nach einem der Ansprüche 1 - 4, dadurch gekennzeichnet, dass der Druckschuh (10) an seiner Vorderseite (25) vor der Einlaufzone (E) eine Vorheizzone (C) aufweist, in der das Pressband (2) über eine mit heissem Druckmittel versorgte hydrostatische Lagertasche (26) aufweisende Oberfläche unter Aufheizung hinweggleitet.Device according to one of claims 1-4, characterized in that the pressure shoe (10) on its front side (25) in front of the inlet zone (E) has a preheating zone (C) in which the press belt (2) is supplied with hot pressure medium hydrostatic bearing pocket (26) having surface slides under heating. Einrichtung nach einem der Ansprüche 1 - 5, dadurch gekennzeichnet, dass in der Pressstrecke (P) nach dem letzten Druckschuh (15) eine Formwalze (16) angeordnet ist, die einen höheren Pressdruck auf das Pressband (2) ausübt als der letzte Druckschuh (15).Device according to one of claims 1-5, characterized in that a forming roller (16) is arranged in the press section (P) after the last press shoe (15), which exerts a higher press pressure on the press belt (2) than the last press shoe ( 15). Einrichtung nach einem der Ansprüche 1 - 6, dadurch gekennzeichnet, dass die Formwalze (6) und/oder die Presstrommel (1) einen drehfesten Träger (16, 19) und einen gegen diesen rotierbaren mit wenigstens einem Stützelement (18, 21) mit einstellbarer Stützkraft abgestützten Mantel (17, 20) aufweist.Device according to one of claims 1-6, characterized in that the shaping roller (6) and / or the press drum (1) has a non-rotatable support (16, 19) and one which is rotatable relative to the latter with at least one support element (18, 21) which is adjustable Supporting supported jacket (17, 20). Einrichtung nach Anspruch 7, dadurch gekennzeichnet, dass die Formwalze (6) und/oder die Presstrommel (1) mehrere in Achsenrichtung nebeneinander angeordnete Stützelemente (18) mit individuell einstellbarer Stützkraft aufweist.Device according to claim 7, characterized in that the forming roller (6) and / or the press drum (1) has a plurality of supporting elements (18) arranged next to one another in the axial direction with individually adjustable supporting force. Einrichtung nach Anspruch 7, dadurch gekennzeichnet, dass die Formwalze (6) in Richtung der Bewegung des Pressbandes (2) verstellbar ist.Device according to claim 7, characterized in that the shaping roller (6) is adjustable in the direction of the movement of the press belt (2). Einrichtung nach einem der Ansprüche 1 - 6, dadurch gekennzeichnet, dass die Formwalze (6) und/oder die Presstrommel (1) an ihrer Pressseite einen durch Dichtleisten (24) abgedichteten, mit Druckfluid füllbaren Teilraum, insbesondere einen Halbraum (h, H) aufweisen.Device according to one of claims 1-6, characterized in that the shaping roller (6) and / or the press drum (1) has on its pressing side a partial space which is sealed by sealing strips (24) and can be filled with pressurized fluid, in particular a half space (h, H) exhibit.
EP93810458A 1993-06-25 1993-06-25 Device for the continuous production of particle boards, fibre boards or the like Expired - Lifetime EP0630726B1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
ES93810458T ES2121977T3 (en) 1993-06-25 1993-06-25 DEVICE FOR THE CONTINUOUS MANUFACTURE OF PARTICLE PANELS, FIBER PANELS OR OTHERS.
EP93202303A EP0630725B1 (en) 1993-06-25 1993-06-25 Device for the continuous production of particle boards, fibre boards or the like
DE59308993T DE59308993D1 (en) 1993-06-25 1993-06-25 Device for the continuous production of chipboard, fiberboard or the like.
EP93810458A EP0630726B1 (en) 1993-06-25 1993-06-25 Device for the continuous production of particle boards, fibre boards or the like
ES93202303T ES2121931T3 (en) 1993-06-25 1993-06-25 DEVICE FOR THE CONTINUOUS MANUFACTURE OF PARTICLE PANELS, FIBER PANELS OR OTHERS.
DE59308992T DE59308992D1 (en) 1993-06-25 1993-06-25 Device for the continuous production of chipboard, fiberboard or the like.
US08/249,517 US5527422A (en) 1993-06-25 1994-05-26 Machine for continuous manufacture of chipboards, fibreboards or similar products
RU9494022263A RU2066634C1 (en) 1993-06-25 1994-06-23 Device for continuous manufacture of wood-particle boards, fiber boards and the like
RU94028279/15A RU2067930C1 (en) 1993-06-25 1994-08-01 Device for continuous manufacture of wood particle boards, fibrous boards or alike

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP93810458A EP0630726B1 (en) 1993-06-25 1993-06-25 Device for the continuous production of particle boards, fibre boards or the like

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP93202303.9 Division-Into 1993-06-25
EP93202303A Division EP0630725B1 (en) 1993-06-25 1993-06-25 Device for the continuous production of particle boards, fibre boards or the like

Publications (2)

Publication Number Publication Date
EP0630726A1 true EP0630726A1 (en) 1994-12-28
EP0630726B1 EP0630726B1 (en) 1998-09-16

Family

ID=8214990

Family Applications (2)

Application Number Title Priority Date Filing Date
EP93202303A Expired - Lifetime EP0630725B1 (en) 1993-06-25 1993-06-25 Device for the continuous production of particle boards, fibre boards or the like
EP93810458A Expired - Lifetime EP0630726B1 (en) 1993-06-25 1993-06-25 Device for the continuous production of particle boards, fibre boards or the like

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP93202303A Expired - Lifetime EP0630725B1 (en) 1993-06-25 1993-06-25 Device for the continuous production of particle boards, fibre boards or the like

Country Status (5)

Country Link
US (1) US5527422A (en)
EP (2) EP0630725B1 (en)
DE (2) DE59308993D1 (en)
ES (2) ES2121931T3 (en)
RU (2) RU2066634C1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10237535A1 (en) * 2002-08-16 2004-03-04 Voith Paper Patent Gmbh Device for the production of material webs
WO2010118609A1 (en) * 2009-04-15 2010-10-21 敦化市亚联机械制造有限公司 Continuous rolling machine with a flexible hot pressboard
CN105599068A (en) * 2015-12-21 2016-05-25 北京林业大学 Rolling hot press and veneer lengthwise joint system and method

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4443763A1 (en) * 1994-12-08 1996-06-13 Hymmen Theodor Gmbh Continuously operating press for the production of wood-based panels
FI98554C (en) * 1995-08-18 1997-07-10 Valmet Corp Method of controlling the load of bend adjustable roll and bend adjustable roll
CH690757A5 (en) * 1995-11-29 2001-01-15 Pretto De Escher Wyss Srl Means for the production of particleboard or fiberboard.
DE19828156A1 (en) * 1998-06-24 1999-12-30 Voith Sulzer Papiertech Patent Device for smoothing a web of material
NL1010620C2 (en) * 1998-11-20 2000-05-23 Klieverik Heli Bv Laminator.
JP2003102770A (en) * 2001-09-28 2003-04-08 Johnson & Johnson Kk Seal device
DE10348595A1 (en) * 2003-10-20 2005-05-19 Voith Paper Patent Gmbh Hydrodynamic in paper dewatering nip assembly or smoothing calendar has outer rim separated from stationary discs by hydraulic gap guide
US8287266B2 (en) 2006-06-16 2012-10-16 GKN Aerospace Services Structures, Corp. Device for performing consolidation and method of use thereof
JP5017148B2 (en) * 2008-03-06 2012-09-05 ユニ・チャーム株式会社 Processing equipment
EP2524805A1 (en) * 2011-05-20 2012-11-21 KBA-NotaSys SA Ink wiping system for an intaglio printing press
EP2524809A1 (en) * 2011-05-20 2012-11-21 KBA-NotaSys SA Ink wiping system for an intaglio printing press

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1374001A (en) * 1963-10-30 1964-10-02 Ts P Konstrouktorskoje Bureau Device for the manufacture of laminated building materials intended primarily for decoration and upholstery
GB1193156A (en) * 1967-09-15 1970-05-28 Ashihara Tekkosho Kk Device for Continuously Pressure Treating Belt-like Articles
DE2549560A1 (en) * 1975-11-05 1977-05-18 Berstorff Gmbh Masch Hermann Continuously operating hardboard press - has endless belt trained over pressure drum to compress cake associated with compression chambers
DE3800513A1 (en) * 1988-01-11 1989-07-27 Baehre & Greten Continuously operating press
US4992133A (en) * 1988-09-30 1991-02-12 Pda Engineering Apparatus for processing composite materials
WO1992019809A1 (en) * 1991-05-03 1992-11-12 Sulzer-Escher Wyss Gmbh Variable-flexibility roller and its use

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1296557C (en) * 1986-04-09 1992-03-03 Josef Pav System of rolls for use in calenders and like machines
FI75407C (en) * 1986-11-21 1988-06-09 Valmet Oy Method in a bend-controlled roll and roll device for application of the method.
US4852229A (en) * 1988-10-11 1989-08-01 Beloit Corporation Self-loading controlled deflection roll
DE4041850A1 (en) * 1990-12-24 1992-06-25 Held Kurt CONTINUOUSLY WORKING DOUBLE BAND PRESS
US5242361A (en) * 1992-11-17 1993-09-07 Beloit Technologies, Inc. Roller mechanism for axially locating the shell of a self-loading controlled deflection roll

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1374001A (en) * 1963-10-30 1964-10-02 Ts P Konstrouktorskoje Bureau Device for the manufacture of laminated building materials intended primarily for decoration and upholstery
GB1193156A (en) * 1967-09-15 1970-05-28 Ashihara Tekkosho Kk Device for Continuously Pressure Treating Belt-like Articles
DE2549560A1 (en) * 1975-11-05 1977-05-18 Berstorff Gmbh Masch Hermann Continuously operating hardboard press - has endless belt trained over pressure drum to compress cake associated with compression chambers
DE3800513A1 (en) * 1988-01-11 1989-07-27 Baehre & Greten Continuously operating press
US4992133A (en) * 1988-09-30 1991-02-12 Pda Engineering Apparatus for processing composite materials
WO1992019809A1 (en) * 1991-05-03 1992-11-12 Sulzer-Escher Wyss Gmbh Variable-flexibility roller and its use

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10237535A1 (en) * 2002-08-16 2004-03-04 Voith Paper Patent Gmbh Device for the production of material webs
WO2010118609A1 (en) * 2009-04-15 2010-10-21 敦化市亚联机械制造有限公司 Continuous rolling machine with a flexible hot pressboard
CN105599068A (en) * 2015-12-21 2016-05-25 北京林业大学 Rolling hot press and veneer lengthwise joint system and method
CN105599068B (en) * 2015-12-21 2018-07-06 北京林业大学 A kind of roll-in hot press, veneer lengthening system and veneer lengthening method

Also Published As

Publication number Publication date
ES2121931T3 (en) 1998-12-16
RU94028279A (en) 1996-06-27
RU2067930C1 (en) 1996-10-20
EP0630725A1 (en) 1994-12-28
US5527422A (en) 1996-06-18
EP0630725B1 (en) 1998-09-16
ES2121977T3 (en) 1998-12-16
DE59308993D1 (en) 1998-10-22
EP0630726B1 (en) 1998-09-16
DE59308992D1 (en) 1998-10-22
RU2066634C1 (en) 1996-09-20

Similar Documents

Publication Publication Date Title
EP0630725B1 (en) Device for the continuous production of particle boards, fibre boards or the like
DE102008027708B4 (en) Plant and a method for the production of material panels, in particular MDF or particle panels
EP0380527B1 (en) Process for manufacturing particle boards and similar, and suitable twin-belt presses
DE4434876B4 (en) Process and plant for the continuous production of a multilayer board
DE19518879A1 (en) Mfr of chipboard etc. by stepped pressing between steel strips
DE102006059564A1 (en) Method and device for pressing pressed material mats
DE2448794A1 (en) PRESSING DEVICE
EP1435281B1 (en) Method and press for continuous manufacturing of fiberboards from wood
DE69406127T2 (en) METHOD AND DEVICE FOR PRESSING FIBER MATERIAL FOR FIBER PANELS
EP0776742B1 (en) Device for the production of particle boards, fibre boards or the like
DE3712634C2 (en)
DE10101952A1 (en) Continual production of chip or fibre board, comprises scattering a material and a binding agent onto a transport band, then passing the band between two steel bands, where the material is heated and pressed
EP2213448A1 (en) Method and installation for guiding a steel band in a continuously operating press
DE8817135U1 (en) Continuously operating continuous press for pressing and curing moisture-containing pressed material mats during the production of chipboards, fibreboards and similar wood-based panels
DE3539364A1 (en) Process for the continuous production of chipboards or fibreboards
DE10124929B4 (en) Process for the continuous production of fiberboard
DE4032700C2 (en) Continuously working press
DE3206558A1 (en) Double-band press
DE3800513A1 (en) Continuously operating press
DE10237535A1 (en) Device for the production of material webs
DE2002870B2 (en) Process for preheating particles mixed with binders
DE102017110875A1 (en) Method for pressing a pressed material mat
WO2023061963A2 (en) Method and apparatus for production of material boards from a pressed material mat
EP3976331A1 (en) Method and device for pre-heating a pressed material mat
DE69400462T2 (en) Feed device for a press

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE ES FR IT

XX Miscellaneous (additional remarks)

Free format text: TEILANMELDUNG 93202303.9 EINGEREICHT AM 25/06/93.

17P Request for examination filed

Effective date: 19950523

17Q First examination report despatched

Effective date: 19960905

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: DE PRETTO-ESCHER WYSS S.R.L.

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE ES FR IT

DX Miscellaneous (deleted)
REF Corresponds to:

Ref document number: 59308993

Country of ref document: DE

Date of ref document: 19981022

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2121977

Country of ref document: ES

Kind code of ref document: T3

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20000526

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20000529

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20000605

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20000622

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010626

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010630

BERE Be: lapsed

Owner name: DE PRETTO-ESCHER WYSS S.R.L.

Effective date: 20010630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020403

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20030303

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050625