WO2006128661A1 - Device for producing an intermediate product or the end product in the production of wood-based panels - Google Patents

Device for producing an intermediate product or the end product in the production of wood-based panels Download PDF

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Publication number
WO2006128661A1
WO2006128661A1 PCT/EP2006/005113 EP2006005113W WO2006128661A1 WO 2006128661 A1 WO2006128661 A1 WO 2006128661A1 EP 2006005113 W EP2006005113 W EP 2006005113W WO 2006128661 A1 WO2006128661 A1 WO 2006128661A1
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WO
WIPO (PCT)
Prior art keywords
light
light barrier
belt
conveying direction
pressing
Prior art date
Application number
PCT/EP2006/005113
Other languages
German (de)
French (fr)
Inventor
Josef Haitzmann
Original Assignee
Kaindl Flooring Gmbh
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
Application filed by Kaindl Flooring Gmbh filed Critical Kaindl Flooring Gmbh
Publication of WO2006128661A1 publication Critical patent/WO2006128661A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers
    • G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
    • G01V8/16—Detecting, e.g. by using light barriers using one transmitter and one receiver using optical fibres
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G39/00—Rollers, e.g. drive rollers, or arrangements thereof incorporated in roller-ways or other types of mechanical conveyors 
    • B65G39/10—Arrangements of rollers
    • B65G39/12—Arrangements of rollers mounted on framework
    • B65G39/16—Arrangements of rollers mounted on framework for aligning belts or chains

Definitions

  • the present invention relates to an apparatus for producing an intermediate product or the final product of the production of wood-based panels, which have on at least one of their surfaces a functional layer o, by pressing at least two layers of material, comprising a belt press with at least one band, which in a Moving direction and in a direction orthogonal to the conveying direction in a pressing chamber exerts a compressive pressure on the at least two layers of material, in an environment whose temperature is more than 100 0 C, and a detector arrangement for detecting the position of a side edge of the tape along a direction orthogonal to the conveying direction.
  • the wood-based panels may be, for example, floor panels, work panels or the like, comprising a fiberboard, preferably MDF or HDF board, or chipboard formed core plate, which on its visible surface a decorative layer as a functional layer and / or on their the Visible surface facing away from a Martinezzug Schweizer as a functional layer.
  • the core plate and the decorative layer or / and the counteracting layer can form the at least two layers of material which are pressed together by means of the device according to the invention to form the wood-based end product.
  • FIG. 1a shows the structure of such a known plate 200 on a hoisto base.
  • one or more functional layers are or are arranged on at least one surface of the core plate 210.
  • a decorative layer 212 On the visible surface of the core plate 210 may be provided a decorative layer 212, which may be multi-layered, and for example a visual position 214 and a carrier layer 216 may include.
  • a single-layer Jacobyak für 218 may be provided on the surface opposite the visible surface of the core plate 210.
  • the decorative layer 212 or / and the Gegenzug Mrs 218 may be formed as a laminate comprising one or more resin-impregnated paper layers.
  • these paper layers can form layers of material which are pressed by means of the device according to the invention into the intermediate laminate.
  • the core plate 210 is usually formed by compressing a loose fill of resin coated wood fibers or wood shavings.
  • the bed can be regarded as being formed by a large number of loose layers, so that the core plate 210 also represents an intermediate product which is produced by means of the inventive device by pressing these loose layers.
  • belt presses for the production of laminates or for the coating of plates (for example MDF boards or particle boards) usually belt presses, in particular double belt presses are used.
  • double belt presses two steel belts, which exert a pressing pressure on the material layers to be pressed, are deflected by steel rollers. It may happen that a steel strip is displaced in a direction orthogonal to the conveying direction on the steel roll, wherein the friction of the steel strip on the steel roll over time creates a burr on the steel strip and a groove is ground in the steel roll. These unwanted burrs on the steel strips can lead to increased cracking.
  • the steel strip must therefore be regularly deburred, resulting in increased repair costs.
  • Each band change also enforces a machine downtime.
  • the in-line groove in the steel roller the band control is inaccurate what also leads to repair costs and machine downtime, since the steel roller must be replaced in this case.
  • Plunger and roller are slidably mounted on bearings 106 in the longitudinal direction of the plunger 102 and a spring 108, which is supported on the roller 104 and the belt 10 facing the bearing 106, provides a restoring force of the roller 104 in the direction of the belt 10 ready.
  • the side edge 12 may contact the roller 104 and its roller and the roller when it is displaced in the direction of the mechanical detector unit 100 Move plunger 102 against the restoring force of the spring 108 along the longitudinal direction of the plunger 102.
  • An initiator 110 disposed in a water-cooled casing detects this displacement of the plunger 102, and outputs as a detection signal, for example, a voltage whose value is proportional to a displacement amount of the plunger 102.
  • the invention provides a generic device in which the detector arrangement comprises a light barrier unit arranged in the press room, a sensor unit arranged outside the press room and at least one light waveguide connecting the light barrier unit and the sensor unit.
  • This detector arrangement has the advantage that a non-contact detection of the position of the side edge of the belt is possible without temperature-sensitive components must be arranged in the press room or in the vicinity of the press room, since in the immediate vicinity of the band, only the light barrier unit consisting of at least a can be operated at temperatures of up to 300 0 C operable optical fiber head, as well as the operable also at high temperatures optical fiber must be arranged.
  • the temperature-sensitive sensor unit can be arranged at a sufficient distance from the press room.
  • the light barrier unit or the or each optical waveguide head comprise a light barrier array comprising at least two light barriers.
  • the position of the side edge of the tape can be detected more accurately, wherein the spatial resolution of the detector array is given by the lateral distance of second array elements.
  • a detector arrangement can be assigned to both side edges of the band. Due to this redundancy, the reliability of the detector arrangements can be improved, since a disturbance of a detector arrangement immediately becomes noticeable due to an inconsistency of the measured values of both detector arrangements.
  • light barriers are understood as meaning both light barriers which operate according to the reflection principle and light barriers which operate according to the interrupter principle
  • a breaker photocell has two optical waveguide heads, each with optics for decoupling light from the light source on an optical waveguide head and the sensor are arranged on the other optical waveguide head, and the object to be detected is pushed between the two optical waveguide heads.
  • the photocell unit used in the present invention may alternatively operate on the principle of reflection, which has the advantage of a simpler arrangement, since an optical waveguide head and an optical waveguide can be omitted, or it may operate on the interrupter principle, and thus a reliable independent of the reflection properties of the tape Deliver measurement result.
  • Fig. 1a is a schematic representation of the structure of known 5 wood-based panels, which on at least one of them
  • Fig. 1b is a schematic representation of a conventional detector arrangement for detecting the position of a side edge of an o tape in a belt press for producing plates on
  • FIG 3 shows a detector arrangement according to the invention in accordance with a second embodiment of the present invention.
  • the detector arrangement 1 comprises two light waveguide heads 14, 16 serving as light barrier arrays, which are respectively arranged below and above the side edge 12 of the steel strip 10 of the belt press (not shown) the side edge 12 of the Bandes 10 projects into the area between the light barrier units 14, 16.
  • These light barrier arrays operating according to the interrupter principle are connected to a commercially available optical sensor head 22 by means of optical waveguides 18, 20, which preferably each comprise a bundle of glass fibers.
  • the optical waveguides 18, 20 are in this case dimensioned so that the sensor head 22 has a sufficient distance from the pressing space of the belt press, so that it can be ensured that in the region of the sensor head 22, the temperatures do not exceed about 50 0 C.
  • the light guides 18, 20 are about 2 meters long.
  • a holder 24 fixes the light barrier units 14, 16 in the desired positions in the vicinity of the side edge 12 of the belt 10.
  • Light from an infrared light source, for example an LED, arranged in the sensor head 22 is coupled into the glass fibers of the optical waveguide bundle 20 and coupled out at the other end of the optical waveguide bundle 20 so that preferably light of the same intensity is coupled into each light barrier array element of the optical waveguide head 16. From the optical waveguide head 16 thus occur at uniform intervals arranged rays in the direction of the other optical waveguide head 14. Depending on the lateral position of the belt 10, some of these beams are absorbed or reflected by the belt 10, so that only at the positions where the belt 10 is not light on the optical fiber head 14 arrives, and here in the optical fiber bundle 18 is coupled ,
  • An infrared light sensor arranged in the sensor head 22 detects the intensity of the light coupled out of the optical waveguide bundle 18 and can then directly determine from this intensity the position of the side edge 12 of the belt 10 in a direction perpendicular to the conveying direction F, which is proportional to the detected light intensity.
  • a plurality of infrared light sensors may be arranged in the sensor head 22, so that in each case one Sensor corresponds to an array element of the optical waveguide head 14, and the position of the side edge of the belt 12 can then be determined by the individual signals of the sensors.
  • Fig. 3 shows a second embodiment of the present invention, in which the light barrier unit does not operate, as in the first embodiment, according to the interrupter principle, but operates on the reflection principle.
  • the same components as in the first embodiment described above are denoted by the same reference numerals, each with the suffix "a".
  • the tape 10 has a relatively good reflectivity, so that a sufficiently strong reflected signal can be provided without causing excessive losses due to absorption and scattering of the light incident on the tape 10.

Abstract

A device for producing an intermediate product or the end product in the production of wood-based panels which have a functional layer on at least one of their surfaces, by pressing at least two material layers, comprises a belt press having at least one belt (10) which moves in a conveying direction (F) and, in a direction extending orthogonally to the conveying direction (F), exerts a pressing force on the at least two material layers in a pressing space, this taking place in an environment in which the temperature is more than 100°C, and a detector arrangement (1) for determining the position of a lateral edge (12) of the belt (10) in a direction orthogonal to the conveying direction (F). Here, the detector arrangement (1) comprises a light barrier unit (14, 16) arranged in the pressing space, a sensor unit (22) arranged outside the pressing space, and at least one optical waveguide (18, 20) for connecting the light barrier unit (14, 16) and the sensor unit (22).

Description

Vorrichtung zur Herstellung eines Zwischenprodukts oder des Endprodukts der Fertigung von Platten auf Holzbasis Apparatus for producing an intermediate product or the final product of manufacturing wood-based panels
5 Beschreibung5 description
Die vorliegende Erfindung betrifft eine Vorrichtung zur Herstellung eines Zwischenprodukts oder des Endprodukts der Fertigung von Platten auf Holzbasis, welche an wenigstens einer ihrer Oberflächen eine Funktionsschicht o aufweisen, durch Verpressen von wenigstens zwei Materiallagen, umfassend eine Bandpresse mit wenigstens einem Band, welches sich in einer Förderrichtung bewegt und in einer orthogonal zur Förderrichtung verlaufenden Richtung in einem Pressraum einen Pressdruck auf die wenigstens zwei Materiallagen ausübt, und dies in einer Umgebung, deren 5 Temperatur mehr als 100 0C beträgt, und eine Detektoranordnung zum Erfassen der Position einer Seitenkante des Bandes entlang einer Richtung orthogonal zur Förderrichtung.The present invention relates to an apparatus for producing an intermediate product or the final product of the production of wood-based panels, which have on at least one of their surfaces a functional layer o, by pressing at least two layers of material, comprising a belt press with at least one band, which in a Moving direction and in a direction orthogonal to the conveying direction in a pressing chamber exerts a compressive pressure on the at least two layers of material, in an environment whose temperature is more than 100 0 C, and a detector arrangement for detecting the position of a side edge of the tape along a direction orthogonal to the conveying direction.
Die Platten auf Holzbasis können beispielsweise Fußbodenpaneele, Arbeits- o platten oder dergleichen sein, die eine als Faserplatte, vorzugsweise MDF- oder HDF-Platte, oder als Spanplatte ausgebildete Kernplatte umfassen, welche an ihrer Sichtfläche eine Dekorschicht als Funktionsschicht oder/und an ihrer der Sichtfläche abgewandten Oberfläche eine Gegenzugschicht als Funktionsschicht aufweist. Die Kernplatte und die Dekorschicht oder/und die 5 Gegenzugschicht können im Rahmen der vorliegenden Erfindung die wenigstens zwei Materiallagen bilden, die mittels der erfindungsgemäßen Vorrichtung zu dem Endprodukt Platte auf Holzbasis miteinander verpresst werden.The wood-based panels may be, for example, floor panels, work panels or the like, comprising a fiberboard, preferably MDF or HDF board, or chipboard formed core plate, which on its visible surface a decorative layer as a functional layer and / or on their the Visible surface facing away from a Gegenzugschicht as a functional layer. In the context of the present invention, the core plate and the decorative layer or / and the counteracting layer can form the at least two layers of material which are pressed together by means of the device according to the invention to form the wood-based end product.
Figur 1a zeigt den Aufbau einer derartigen bekannten Platte 200 auf HoIz- o basis. Hierbei ist bzw. sind an wenigstens einer Oberfläche der Kernplatte 210 eine oder mehrere Funktionsschichten anegordnet. An der Sichtoberfläche der Kernplatte 210 kann eine Dekorschicht 212 vorgesehen sein, die mehrlagig ausgeführt sein kann, und beispielsweise eine Sichtlage 214 und eine Trägerlage 216 umfassen kann. An der der Sichtoberfläche gegenüberliegenden Oberfläche der Kernplatte 210 kann eine einlagige Gegenzugschicht 218 vorgesehen sein.FIG. 1a shows the structure of such a known plate 200 on a hoisto base. In this case, one or more functional layers are or are arranged on at least one surface of the core plate 210. On the visible surface of the core plate 210 may be provided a decorative layer 212, which may be multi-layered, and for example a visual position 214 and a carrier layer 216 may include. On the surface opposite the visible surface of the core plate 210, a single-layer Gegenzugschicht 218 may be provided.
Die Dekorschicht 212 oder/und die Gegenzugschicht 218 können als Laminat ausgebildet sein, das eine oder mehrere mit Kunstharz imprägnierte Papierlagen umfasst. Im Rahmen der vorliegenden Erfindung können diese Papierlagen Materiallagen bilden, die mittels der erfindungsgemäßen Vorrichtung zu dem Zwischenprodukt Laminat verpresst werden.The decorative layer 212 or / and the Gegenzugschicht 218 may be formed as a laminate comprising one or more resin-impregnated paper layers. In the context of the present invention, these paper layers can form layers of material which are pressed by means of the device according to the invention into the intermediate laminate.
Die Kernplatte 210 wird üblicherweise durch Komprimieren einer losen Schüttung von mit Kunstharz beschichteten Holzfasern oder Holzspänen gebildet. Im Rahmen der vorliegenden Erfindung kann die Schüttung als von einer großen Anzahl von Schüttlagen gebildet angesehen werden, so dass auch die Kernplatte 210 ein Zwischenprodukt darstellt, welches mittels der erfindungsgemäßen Vorrichtung durch Verpressen dieser Schüttlagen hergestellt wird.The core plate 210 is usually formed by compressing a loose fill of resin coated wood fibers or wood shavings. In the context of the present invention, the bed can be regarded as being formed by a large number of loose layers, so that the core plate 210 also represents an intermediate product which is produced by means of the inventive device by pressing these loose layers.
Zur Herstellung von Laminaten oder zur Beschichtung von Platten (beispielsweise MDF-Platten oder Spanplatten) werden üblicherweise Bandpressen, insbesondere Doppelbandpressen verwendet. Bei diesen bekannten Doppelbandpressen werden zwei Stahlbänder, die einen Pressdruck auf die zu verpressenden Materiallagen ausüben, über Stahlrollen umgelenkt. Hierbei kann es vorkommen, dass sich ein Stahlband in einer Richtung orthogonal zur Förderrichtung auf der Stahlrolle verschiebt, wobei durch die Reibung des Stahlbandes an der Stahlrolle mit der Zeit am Stahlband ein Grat entsteht und in die Stahlrolle eine Nut eingeschliffen wird. Diese unerwünschten Grate an den Stahlbändern können zu verstärkter Rissbildung führen. Das Stahlband muss daher regelmäßig entgratet werden, wodurch erhöhte Reparaturkosten anfallen. Jeder Bandwechsel erzwingt zudem einen Maschinenstillstand. Außerdem wird durch die eingeschliffene Nut in der Stahlrolle die Bandsteuerung ungenauer, was ebenfalls zu Reparaturkosten und Maschinenstillständen führt, da die Stahlrolle in diesem Fall ausgetauscht werden muss.For the production of laminates or for the coating of plates (for example MDF boards or particle boards) usually belt presses, in particular double belt presses are used. In these known double belt presses, two steel belts, which exert a pressing pressure on the material layers to be pressed, are deflected by steel rollers. It may happen that a steel strip is displaced in a direction orthogonal to the conveying direction on the steel roll, wherein the friction of the steel strip on the steel roll over time creates a burr on the steel strip and a groove is ground in the steel roll. These unwanted burrs on the steel strips can lead to increased cracking. The steel strip must therefore be regularly deburred, resulting in increased repair costs. Each band change also enforces a machine downtime. In addition, the in-line groove in the steel roller, the band control is inaccurate what also leads to repair costs and machine downtime, since the steel roller must be replaced in this case.
Es ist daher wichtig, bei einer Bandpresse möglichst jede seitliche Bewe- gung des Bandes (orthogonal zur Förderrichtung) zu verhindern, wofür eine möglichst genaue Detektion der Position einer Seitenkante des Bandes benötigt wird, um einer etwaigen seitlichen Bewegung des Bandes gegensteuern zu können. Herkömmlich erfolgte diese Detektion, wie in Figur 1 b dargestellt, mittels einer mechanischen Detektoranordnung 100. Bei dieser bekannten Detektoranordnung 100 ist nahe an der Seitenkante 12 des in Förderrichtung F laufenden Bandes 10 ein Stößel 102 angebracht, an dessen Ende eine Rolle 104 vorgesehen ist. Stößel und Rolle sind auf Lagerungen 106 in Längsrichtung des Stößels 102 verschiebbar gelagert und eine Feder 108, die sich an der Rolle 104 und an der dem Band 10 zugewandten Lagerung 106 abstützt, stellt eine Rückstellkraft der Rolle 104 in Richtung des Bandes 10 bereit.It is therefore important to prevent as much as possible any lateral movement of the belt in a belt press (orthogonal to the conveying direction), for which the most accurate detection of the position of a side edge of the belt is required in order to be able to counteract any lateral movement of the belt. Conventionally, this detection, as shown in Figure 1 b, by means of a mechanical detector assembly 100. In this known detector assembly 100 is close to the side edge 12 of the current in the conveying direction F belt 10, a plunger 102 is attached to the end of a roller 104 is provided. Plunger and roller are slidably mounted on bearings 106 in the longitudinal direction of the plunger 102 and a spring 108, which is supported on the roller 104 and the belt 10 facing the bearing 106, provides a restoring force of the roller 104 in the direction of the belt 10 ready.
Wenn sich nun bei Betrieb der Bandpresse das Stahlband 10 in einer Richtung orthogonal zur Förderrichtung F seitlich verschiebt, so kann die Seitenkante 12 bei einer Verschiebung in Richtung auf die mechanische Detektoreinheit 100 zu mit der Rolle 104 in Kontakt treten und diese Rolle und den daran angebrachten Stößel 102 gegen die Rückstellkraft der Feder 108 entlang der Längsrichtung des Stößels 102 verschieben.If, during operation of the belt press, the steel belt 10 laterally shifts in a direction orthogonal to the conveying direction F, the side edge 12 may contact the roller 104 and its roller and the roller when it is displaced in the direction of the mechanical detector unit 100 Move plunger 102 against the restoring force of the spring 108 along the longitudinal direction of the plunger 102.
Ein in einem wassergekühlten Gehäuse angeordneter Initiator 110 detektiert diese Verschiebung des Stößels 102 und gibt als Detektionssignal beispielsweise eine Spannung aus, deren Wert proportional zu einem Verschiebungsbetrag des Stößels 102 ist.An initiator 110 disposed in a water-cooled casing detects this displacement of the plunger 102, and outputs as a detection signal, for example, a voltage whose value is proportional to a displacement amount of the plunger 102.
Diese herkömmliche Detektoranordnung ist, da sie mechanisch arbeitet, aufwendig in Herstellung und Installation und zudem relativ wartungsintensiv. Es war bisher allerdings nicht möglich, weniger wartungsintensive Detektoranordnungen zur Erfassung einer seitlichen Verschiebung der Seitenkante eines Bandes einer Bandpresse einzusetzen, da in unmittelbarer Nähe des Pressraums Temperaturen von bis zu 25O0C auftreten, und somit zumindest der in unmittelbarer Nähe des Bandes 10 befindliche Teil der Detektoranordnung hochtemperaturbeständig sein muss.This conventional detector arrangement, since it works mechanically, consuming in production and installation and also relatively maintenance-intensive. However, it has not been possible so far, less maintenance-intensive detector arrangements for detecting a lateral Displacement of the side edge of a belt to use a belt press, since in the immediate vicinity of the pressing chamber temperatures of up to 25O 0 C occur, and thus at least the located in the immediate vicinity of the belt 10 part of the detector assembly must be resistant to high temperatures.
Es ist demgegenüber Aufgabe der Erfindung, eine Detektoranordnung für eine gattungsgemäße Vorrichtung bereitzustellen, die einfacher zu installieren und weniger wartungsintensiv ist als die herkömmliche, mechanische Detektoranordnung.It is accordingly an object of the invention to provide a detector assembly for a generic device, which is easier to install and less maintenance intensive than the conventional mechanical detector assembly.
Zur Lösung dieser Aufgabe stellt die Erfindung eine gattungsgemäße Vorrichtung bereit, bei der die Detektoranordnung eine im Pressraum angeordnete Lichtschrankeneinheit, eine außerhalb des Pressraums angeordnete Sensoreinheit und wenigstens einen die Lichtschrankeneinheit und die Sensoreinheit verbindenden Lichtwellenleiter umfasst.To achieve this object, the invention provides a generic device in which the detector arrangement comprises a light barrier unit arranged in the press room, a sensor unit arranged outside the press room and at least one light waveguide connecting the light barrier unit and the sensor unit.
Diese erfindungsgemäße Detektoranordnung hat den Vorteil, dass eine berührungslose Erfassung der Position der Seitenkante des Bandes möglich ist, ohne dass temperaturempfindliche Bauteile in dem Pressraum oder in der Nähe des Pressraums angeordnet werden müssen, da in unmittelbarer Nachbarschaft des Bandes nur die Lichtschrankeneinheit, die aus wenigstens einem bei Temperaturen von bis zu 3000C betreibbaren Lichtwellenleiterkopf bestehen kann, sowie die ebenfalls bei hohen Temperaturen betreibbaren Lichtwellenleiter angeordnet werden müssen. Die temperatur- empfindliche Sensoreinheit hingegen kann mit ausreichendem Abstand zum Pressraum angeordnet werden.This detector arrangement according to the invention has the advantage that a non-contact detection of the position of the side edge of the belt is possible without temperature-sensitive components must be arranged in the press room or in the vicinity of the press room, since in the immediate vicinity of the band, only the light barrier unit consisting of at least a can be operated at temperatures of up to 300 0 C operable optical fiber head, as well as the operable also at high temperatures optical fiber must be arranged. By contrast, the temperature-sensitive sensor unit can be arranged at a sufficient distance from the press room.
Bei einer bevorzugten Ausführungsform der vorliegenden Erfindung kann die Lichtschrankeneinheit bzw. der oder jeder Lichtwellenleiterkopf einen wenigstens zwei Lichtschranken umfassenden Lichtschrankenarray umfassen. Hierdurch kann die Position der Seitenkante des Bandes genauer erfasst werden, wobei die räumliche Auflösung der Detektoranordnung durch den seitlichen Abstand zweiter Array-Elemente gegeben ist. Weiterhin kann beiden Seitenkanten des Bandes eine Detektoranordnung zugeordnet sein. Durch diese Redundanz kann die Zuverlässigkeit der Detektoranordnungen verbessert werden, da eine Störung einer Detektor- anordnung sofort durch eine Inkonsistenz der Messwerte beider Detektoranordnungen auffällt.In a preferred embodiment of the present invention, the light barrier unit or the or each optical waveguide head comprise a light barrier array comprising at least two light barriers. As a result, the position of the side edge of the tape can be detected more accurately, wherein the spatial resolution of the detector array is given by the lateral distance of second array elements. Furthermore, a detector arrangement can be assigned to both side edges of the band. Due to this redundancy, the reliability of the detector arrangements can be improved, since a disturbance of a detector arrangement immediately becomes noticeable due to an inconsistency of the measured values of both detector arrangements.
Mit „Lichtschranken" im Sinne der Erfindung sind hierbei sowohl Lichtschranken gemeint, die nach dem Reflexionsprinzip arbeiten, als auch Licht- schranken, die nach dem Unterbrecherprinzip arbeiten. Bei einer Reflexions- Lichtschranke sind hierbei die Optik zur Auskopplung von Licht der Lichtquelle und die Optik zur Einkopplung von Licht zum Sensor auf demselben Lichtwellenleiterkopf angebracht, so dass das von dem zu detektierenden Objekt reflektierte Licht von den Sensoren erfasst wird. Bei einer Unter- brecher-Lichtschranke sind zwei Lichtwellenleiterköpfe vorgesehen, bei denen jeweils die Optik zur Auskopplung von Licht der Lichtquelle auf einem Lichtwellenleiterkopf und der Sensor auf dem anderen Lichtwellenleiterkopf angeordnet sind, und das zu detektierende Objekt zwischen die beiden Lichtwellenleiterköpfe geschoben wird.In the context of the invention, "light barriers" are understood as meaning both light barriers which operate according to the reflection principle and light barriers which operate according to the interrupter principle In order to couple light to the sensor on the same optical waveguide head, the light reflected from the object to be detected is detected by the sensors A breaker photocell has two optical waveguide heads, each with optics for decoupling light from the light source on an optical waveguide head and the sensor are arranged on the other optical waveguide head, and the object to be detected is pushed between the two optical waveguide heads.
Die bei der vorliegenden Erfindung verwendete Lichtschrankeneinheit kann alternativ entweder nach dem Reflexionsprinzip arbeiten, welches den Vorteil einer einfacheren Anordnung aufweist, da ein Lichtwellenleiterkopf und ein Lichtwellenleiter entfallen können, oder sie kann nach dem Unterbrecherprinzip arbeiten, und damit unabhängig von den Reflexionseigenschaften des Bandes ein zuverlässiges Messergebnis liefern.The photocell unit used in the present invention may alternatively operate on the principle of reflection, which has the advantage of a simpler arrangement, since an optical waveguide head and an optical waveguide can be omitted, or it may operate on the interrupter principle, and thus a reliable independent of the reflection properties of the tape Deliver measurement result.
Bei Einsatz eines Lichtschrankenarrays, d.h. einer Mehrzahl von einander unmittelbar benachbarten Lichtschranken, besteht beispielsweise in Folge von Streueffekten die Möglichkeit des „Übersprechens" des vom Lichtemitter einer Lichtschranke ausgehenden Lichts in den Lichtrezeptor einer anderen Lichtschranke. Dies kann dazu führen, dass die beispielsweise durch den Abstand benachbarter Lichtschranken gegebene, theoretisch mögliche Ortsauflösung des Lichtschrankenarrays in der Praxis nicht erreicht werden kann. Diesem Problem kann beispielsweise dadurch entgegengewirkt werden, dass wenigstens eine der Lichtschranken des Lichtschrankenarrays 5 auf Basis von Lichtimpulsen arbeitet, deren Dauer oder/und Phase sich von jenen der Lichtimpulse wenigstens einer benachbarten Lichtschranke unterscheidet. Unter der Phase eines Lichtimpulses wird dabei die zeitliche Lage des Beginns oder/und Endes dieses Lichtimpulses relativ zur zeitlichen Lage des Beginns oder/und Endes anderer Lichtimpulse verstanden. 0When using a light barrier array, ie a plurality of directly adjacent light barriers, there is the possibility, for example, of "crosstalk" of the light emanating from the light emitter of a light barrier into the light receptor of another photoelectric barrier as a result of scattering effects Distance between adjacent light barriers given, theoretically possible spatial resolution of the light barrier array can not be achieved in practice. This problem can be counteracted, for example, by the fact that at least one of the light barriers of the light barrier array 5 operates on the basis of light pulses whose duration and / or phase differ from those of the light pulses of at least one adjacent light barrier. The phase of a light pulse is understood to be the time position of the beginning or / and end of this light pulse relative to the temporal position of the beginning or / and end of other light pulses. 0
Die vorliegende Erfindung wird im Folgenden rein exemplarisch am Beispiel der beigefügten Zeichnungen erläutert. Es zeigt:The present invention is explained below purely by way of example using the attached drawings. It shows:
Fig. 1a eine schematische Darstellung des Aufbaus von bekannten 5 Platten auf Holzbasis, welche an wenigstens einer ihrerFig. 1a is a schematic representation of the structure of known 5 wood-based panels, which on at least one of them
Oberflächen eine Funktionsschicht aufweisen;Surfaces have a functional layer;
Fig. 1b eine schematische Darstellung einer herkömmlichen Detektoranordnung zum Erfassen der Position einer Seitenkante eines o Bandes bei einer Bandpresse zum Herstellen von Platten aufFig. 1b is a schematic representation of a conventional detector arrangement for detecting the position of a side edge of an o tape in a belt press for producing plates on
Holzbasis;Wooden base;
Fig. 2 eine erfindungsgemäße Detektoranordnung gemäß einer ersten Ausführungsform der vorliegenden Erfindung; under 52 shows a detector arrangement according to the invention according to a first embodiment of the present invention; under 5
Fig. 3 eine erfindungsgemäße Detektoranordnung gemäß einer zweiten Ausführungsform der vorliegenden Erfindung.3 shows a detector arrangement according to the invention in accordance with a second embodiment of the present invention.
Wie in Fig. 2 ersichtlich, umfasst die Detektoranordnung 1 gemäß einer o ersten Ausführungsform der vorliegenden Erfindung zwei als Lichtschrankenarrays dienende Lichtwellenleiterköpfe 14, 16, die jeweils unterhalb und oberhalb der Seitenkante 12 des Stahlbandes 10 der (nicht dargestellten) Bandpresse angeordnet sind, so dass die Seitenkante 12 des Bandes 10 in den Bereich zwischen den Lichtschrankeneinheiten 14, 16 hineinragt. Diese nach dem Unterbrecherprinzip arbeitenden Lichtschrankenarrays sind mittels Lichtwellenleitern 18, 20, die vorzugsweise jeweils ein Bündel von Glasfasern umfassen, mit einem handelsüblichen optischen Sensorkopf 22 verbunden.As can be seen in FIG. 2, the detector arrangement 1 according to a first embodiment of the present invention comprises two light waveguide heads 14, 16 serving as light barrier arrays, which are respectively arranged below and above the side edge 12 of the steel strip 10 of the belt press (not shown) the side edge 12 of the Bandes 10 projects into the area between the light barrier units 14, 16. These light barrier arrays operating according to the interrupter principle are connected to a commercially available optical sensor head 22 by means of optical waveguides 18, 20, which preferably each comprise a bundle of glass fibers.
Die Lichtwellenleiter 18, 20 sind hierbei so bemessen, dass der Sensorkopf 22 einen ausreichenden Abstand zum Pressraum der Bandpresse aufweist, damit sichergestellt werden kann, dass im Bereich des Sensorkopfes 22 die Temperaturen ca. 500C nicht überschreiten. Bei der vorliegenden Ausführungsform sind die Lichtleiter 18, 20 etwa 2 Meter lang. Eine Halterung 24 fixiert die Lichtschrankeneinheiten 14, 16 in den gewünschten Positionen in der Nähe der Seitenkante 12 des Bandes 10.The optical waveguides 18, 20 are in this case dimensioned so that the sensor head 22 has a sufficient distance from the pressing space of the belt press, so that it can be ensured that in the region of the sensor head 22, the temperatures do not exceed about 50 0 C. In the present embodiment, the light guides 18, 20 are about 2 meters long. A holder 24 fixes the light barrier units 14, 16 in the desired positions in the vicinity of the side edge 12 of the belt 10.
Licht von einer im Sensorkopf 22 angeordneten Infrarot-Lichtquelle, beispielsweise einer LED, wird in die Glasfasern des Lichtwellenleiterbündels 20 eingekoppelt und am anderen Ende des Lichtwellenleiterbündels 20 so ausgekoppelt, dass in jedes Lichtschrankenarray-Element des Lichtwellenleiterkopfs 16 vorzugsweise Licht gleicher Intensität eingekoppelt wird. Aus dem Lichtwellenleiterkopf 16 treten also in gleichmäßigen Abständen angeordnete Strahlen in Richtung auf den anderen Lichtwellenleiterkopf 14 aus. In Abhängigkeit von der seitlichen Position des Bandes 10 werden einige dieser Strahlen vom Band 10 absorbiert oder reflektiert, so dass nur an den Positionen, an denen sich das Band 10 nicht befindet, Licht am Lichtwellenleiterkopf 14 ankommt, und hier in das Lichtwellenleiterbündel 18 eingekoppelt wird.Light from an infrared light source, for example an LED, arranged in the sensor head 22 is coupled into the glass fibers of the optical waveguide bundle 20 and coupled out at the other end of the optical waveguide bundle 20 so that preferably light of the same intensity is coupled into each light barrier array element of the optical waveguide head 16. From the optical waveguide head 16 thus occur at uniform intervals arranged rays in the direction of the other optical waveguide head 14. Depending on the lateral position of the belt 10, some of these beams are absorbed or reflected by the belt 10, so that only at the positions where the belt 10 is not light on the optical fiber head 14 arrives, and here in the optical fiber bundle 18 is coupled ,
Ein im Sensorkopf 22 angeordneter Infrarotlicht-Sensor erfasst die Intensität des aus dem Lichtwellenleiterbündel 18 ausgekoppelten Lichts und kann dann aus dieser Intensität direkt die Position der Seitenkante 12 des Bandes 10 in einer Richtung senkrecht zur Förderrichtung F bestimmen, die proportional zur erfassteπ Lichtintensität ist. Alternativ können im Sensorkopf 22 mehrere Infrarotlicht-Sensoren angeordnet sein, so dass jeweils ein Sensor einem Array-Element des Lichtwellenleiterkopfes 14 entspricht, und die Position der Seitenkante des Bandes 12 dann durch die Einzelsignale der Sensoren bestimmt werden kann.An infrared light sensor arranged in the sensor head 22 detects the intensity of the light coupled out of the optical waveguide bundle 18 and can then directly determine from this intensity the position of the side edge 12 of the belt 10 in a direction perpendicular to the conveying direction F, which is proportional to the detected light intensity. Alternatively, a plurality of infrared light sensors may be arranged in the sensor head 22, so that in each case one Sensor corresponds to an array element of the optical waveguide head 14, and the position of the side edge of the belt 12 can then be determined by the individual signals of the sensors.
Fig. 3 zeigt eine zweite Ausführungsform der vorliegenden Erfindung, bei der die Lichtschrankeneinheit nicht, wie bei der ersten Ausführungsform, nach dem Unterbrecherprinzip arbeitet, sondern nach dem Reflexionsprinzip arbeitet. Hierbei sind gleiche Komponenten wie bei der vorangehend beschriebenen ersten Ausführungsform mit gleichen Bezugszeichen bezeichnet, jeweils mit dem Zusatz „a".Fig. 3 shows a second embodiment of the present invention, in which the light barrier unit does not operate, as in the first embodiment, according to the interrupter principle, but operates on the reflection principle. Here, the same components as in the first embodiment described above are denoted by the same reference numerals, each with the suffix "a".
Bei der nach dem Reflexionsprinzip arbeitenden Lichtschrankeneinheit der zweiten Ausführungsform sind nur ein einziger als Lichtschrankenarray dienender Lichtwellenleiterkopf 14a und nur ein einziges Lichtwellen- leiterbündel 18a erforderlich, da hierbei das Licht erfasst wird, das vom Band 10 wieder zurück zum Lichtwellenleiterkopf 14a reflektiert wird, und somit in separaten, nicht bereits zum Leiten von Licht von der Infrarot- Lichtquelle im Sensorkopf 22a zum Lichtwellenleiterkopf 14a dienenden, Glasfasern desselben Lichtwellenleiterbündels 18a wieder zurück zum optischen Sensorkopf 22a geleitet und dort zu dem oder den Infrarotlicht- Sensoren ausgekoppelt werden kann.In the light barrier unit of the second embodiment operating according to the reflection principle, only a single optical waveguide head 14a and only one optical waveguide bundle 18a are required, since in this case the light is reflected, which is reflected back to the optical waveguide head 14a by the belt 10, and thus in separate, not already for guiding light from the infrared light source in the sensor head 22a to the optical waveguide head 14a serving, glass fibers of the same optical fiber bundle 18a back to the optical sensor head 22a passed and there can be coupled to the one or more infrared light sensors.
Allerdings ist es für diese Reflexions-Lichtschrankeneinheit erforderlich, dass das Band 10 ein relativ gutes Reflektionvermögen aufweist, damit ein ausreichend starkes reflektiertes Signal bereitgestellt werden kann, ohne dass allzugroße Verluste aufgrund von Absorption und Streuung des auf das Band 10 auftreffenden Lichtes auftreten. However, it is required for this reflection type photoelectric switch unit that the tape 10 has a relatively good reflectivity, so that a sufficiently strong reflected signal can be provided without causing excessive losses due to absorption and scattering of the light incident on the tape 10.

Claims

Ansprüche claims
1. Vorrichtung zur Herstellung eines Zwischenprodukts oder des1. Apparatus for producing an intermediate product or the
5 Endprodukts der Fertigung von Platten (200) auf Holzbasis, welche an wenigstens einer ihrer Oberflächen eine Funktionsschicht (212, 214, 216, 218) aufweisen, durch Verpressen von wenigstens zwei Materiallagen (210, 212, 214, 216, 218), eine Bandpresse mit wenigstens einem Band (10), o welches sich in einer Förderrichtung (F) bewegt und in einer orthogonal zur Förderrichtung (F) verlaufenden Richtung in einem Pressraum einen Pressdruck auf die wenigstens zwei Materiallagen (210, 212, 214, 216, 218) ausübt, und dies in einer Umgebung, deren Temperatur mehr als 100 0C beträgt, und 5 eine Detektoranordnung (1; 1a) zum Erfassen der Position einer Seitenkante (12) des Bandes (10) entlang einer Richtung orthogonal zur Förderrichtung (F), dadurch gekennzeichnet, dass die Detektoranordnung (1 ; 1a) eine im Pressraum angeordnete Lichtschrankeneinheit (14, 16; 14a), eine o außerhalb des Pressraums angeordnete Sensoreinheit (22; 22a) und wenigstens einen die Lichtschrankeneinheit (14, 16; 14a) und die Sensoreinheit (22; 22a) verbindenden Lichtwellenleiter (18, 20; 18a) umfasst.5 end product of the production of wood-based panels (200) having on at least one of their surfaces a functional layer (212, 214, 216, 218) by pressing at least two layers of material (210, 212, 214, 216, 218) Belt press with at least one belt (10), which moves in a conveying direction (F) and in a direction orthogonal to the conveying direction (F) in a pressing space a pressing pressure on the at least two material layers (210, 212, 214, 216, 218 ) exerts, and this in an environment whose temperature is more than 100 0 C, and 5 a detector arrangement (1; 1a) for detecting the position of a side edge (12) of the band (10) along a direction orthogonal to the conveying direction (F) , characterized in that the detector arrangement (1, 1a) has a light barrier unit (14, 16, 14a) arranged in the press room, a sensor unit (22, 22a) arranged outside the press room and at least one light barrier unit (14, 16 14a) and the sensor unit (22; 22a) comprises optical waveguides (18, 20, 18a).
5 2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die Lichtschrankeneinheit (14, 16; 14a) einen wenigstens zwei Lichtschranken umfassenden Licht- schrankenarray (14, 16; 14a) umfasst.2. Device according to claim 1, characterized in that the light barrier unit (14, 16; 14a) comprises a light barrier array (14, 16, 14a) comprising at least two light barriers.
0 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass beiden Seitenkanten (12) des Bandes (10) eine Detektoranordnung (1; 1a) zugeordnet ist. 0 3. A device according to claim 1 or 2, characterized in that both side edges (12) of the strip (10) is associated with a detector arrangement (1, 1 a).
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Lichtschrankeneinheit (14a) nach dem Reflexionsprinzip arbeitet.4. Device according to one of claims 1 to 3, characterized in that the light barrier unit (14a) operates on the reflection principle.
5. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Lichtschrankeneinheit (14, 16) nach dem Unterbrecherprinzip arbeitet.5. Device according to one of claims 1 to 3, characterized in that the light barrier unit (14, 16) operates on the breaker principle.
6. Vorrichtung nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, dass wenigstens eine der Lichtschranken des Lichtschrankenarrays auf Basis von Lichtimpulsen arbeitet, deren Dauer oder/und Phase sich von jenen der Lichtimpulse wenigstens einer benachbarten Lichtschranke unterscheidet 6. Device according to one of claims 2 to 5, characterized in that at least one of the light barriers of the light barrier array operates on the basis of light pulses whose duration and / or phase differs from those of the light pulses at least one adjacent light barrier
PCT/EP2006/005113 2005-05-30 2006-05-29 Device for producing an intermediate product or the end product in the production of wood-based panels WO2006128661A1 (en)

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