EP2241426A1 - Method of producing a fibreboard - Google Patents

Method of producing a fibreboard Download PDF

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Publication number
EP2241426A1
EP2241426A1 EP09005468A EP09005468A EP2241426A1 EP 2241426 A1 EP2241426 A1 EP 2241426A1 EP 09005468 A EP09005468 A EP 09005468A EP 09005468 A EP09005468 A EP 09005468A EP 2241426 A1 EP2241426 A1 EP 2241426A1
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EP
European Patent Office
Prior art keywords
cake
wood
conveyor belt
impregnation
vacuum
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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.)
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EP09005468A
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German (de)
French (fr)
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EP2241426B1 (en
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.)
Flooring Technologies Ltd
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Flooring Technologies Ltd
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Publication date
Application filed by Flooring Technologies Ltd filed Critical Flooring Technologies Ltd
Priority to EP09005468.5A priority Critical patent/EP2241426B1/en
Priority to PL16151741T priority patent/PL3028829T3/en
Priority to ES16151741T priority patent/ES2738596T3/en
Priority to EP16151741.2A priority patent/EP3028829B1/en
Priority to PL09005468.5T priority patent/PL2241426T3/en
Priority to ES09005468.5T priority patent/ES2585367T3/en
Publication of EP2241426A1 publication Critical patent/EP2241426A1/en
Application granted granted Critical
Publication of EP2241426B1 publication Critical patent/EP2241426B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
    • 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
    • B27N1/00—Pretreatment of moulding material
    • 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
    • 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
    • B27N9/00—Arrangements for fireproofing

Definitions

  • the invention relates to a method for producing a wood-based panel, in particular a wood fiber board, in which a cake sprinkled with an adhesive wood fibers or wood chips scattered on an endlessly circulating conveyor belt and conveyed in a transport direction T to various processing stations, the compressed cake in a pre-press and then pressed under pressure and temperature influence in a hot press to a plate of desired thickness.
  • Such a method is for example from the DE 10 2005 033 687 A1 known.
  • first long fibers must be produced in a defibering cut, which can be done in an upstream process or immediately before the plant for producing the wood fiber boards.
  • the coarse, long wood fibers are then applied with additives, such as flame retardants and water repellents.
  • binder urea-formaldehyde glue
  • the fibers are then dried with appropriate additives and the fiber sizing via a power tube dryer.
  • the fiber mixture is sprinkled on a spreading device to an endless cake on the endless circulating conveyor belt.
  • the loosely sprinkled mixed fiber cake is then fed from the conveyor belt to a cold pre-press and cold pre-compaction of the fiber web is achieved. Subsequently, the nonwoven fabric is returned to the conveyor belt of a continuous hot press in which it is hot pressed to a plate of desired thickness.
  • the press belts are advantageously coated with a release agent to prevent adhesion of the prevent plates formed.
  • the endlessly produced plates are then formatted and separated into individual plates and then assembled.
  • MDF Medium Density Fiberboard
  • HDF High Density Fiberboard
  • properties may be, for example, the conductivity that is involved or desired for a fiberboard either in powder coating the panel itself or when the panel is to be used as a laminate flooring panel support and the flooring must have antistatic properties.
  • the conductivity can be achieved by adding salts in the manufacturing process, for example in the refining process.
  • Another desired property may be a fire retardant design.
  • the method described above is to be improved so that a quick and safe impregnation of the wood-based panel with various impregnation is possible.
  • a generic method is characterized in that the cake on the conveyor belt behind the pre-press and before the hot press is exposed to a vacuum, and at the same time an impregnating medium is applied to the fiber cake, which is distributed due to the vacuum in the fiber cake.
  • the impregnation takes place at a time within the manufacturing process, to which a high porosity of the surface is still present, which means that the impregnating medium can be easily sucked into the cake and evenly distributed there.
  • the vacuum is applied underneath the fiber cake and the impregnation medium applied to the fiber cake from above.
  • the impregnation medium can be liquid or powdery.
  • the impregnation medium is liquid, it can be sprayed onto the fiber cake by means of nozzles.
  • the device for applying the impregnation medium can be arranged stationary, which simplifies the construction of the production line and reduces its cost.
  • the impregnation is applied at least partially.
  • areas are created with / without impregnation (tempering), the tempered areas having deviating properties in relation to non-tempered areas.
  • the impregnation medium can influence, for example, the water absorption capacity or the strength values of the finished-pressed wood-based panel.
  • the impregnation station preferably consists of a vacuum station arranged below the conveyor belt and an application unit arranged above the conveyor belt for an impregnating medium.
  • the conveyor belt has vacuum channels, which are preferably produced by a perforation, laterally next to the conveyor belt in the transport direction extending over the length of the impregnation station extending sheets are provided for lateral limitation of the vacuum.
  • the application unit is preferably arranged stationary and in particular preferably formed by nozzles.
  • the number of nozzles is determined by the nature of the desired impregnation.
  • the nozzles may be arranged parallel to one another over the full width of the chip or fiber cake or only partially, for example at the edge.
  • the wood fibers or wood chips wetted with a glue are sprinkled onto the conveyor belt 2, which is endlessly driven in the transport direction T, to form a cake 6.
  • a glue preferably a urea-formaldehyde glue
  • the cake 6 is compressed, so cold pre-compressed.
  • an impregnation station 4 is integrated, consisting of a below the conveyor belt 2 arranged vacuum station 12 and one above the conveyor belt 2 arranged application unit, such as nozzles 7, 8, consists.
  • the vacuum station 12 and the application units 7, 8 are stationary and immovable.
  • the conveyor belt 2 is perforated, so that vacuum channels form, by means of which the impregnating medium sprayed onto the upper side of the compressed cake 6 can be sucked by the vacuum station 12.
  • Side of the coating units plates 9, 10 are provided, which limit the cake 6 side and ensure that no air from the side can be sucked into the cake 6.
  • the metal sheets 9, 10 preferably extend over the entire length of the impregnating station 4.
  • the metal sheets 9, 10 are part of a closed frame 11 which encloses the impregnating station 4 to the outside and the vacuum station 12 receives as well as the application unit.
  • two nozzles 7, 8 are exemplified for the application unit.
  • a desired number of nozzles in the desired distribution be provided within the impregnation station.
  • the conveyor belt 2 runs over an air-permeable frame part 13.
  • impregnation medium fire retardant particles as well as insect repellent protective particles can be used. Also, colors can be used as the impregnation medium to colorize the cake 6 targeted.
  • a heated impregnating medium By applying a heated impregnating medium, the cake 6 can be heated and thus the production speed can be increased. For heating the cake 6 also heated air can be entered.

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

Abstract

The method involves exposing a cake e.g. chip cake or fiber cake, made of wood chips or wood fibers on a conveyor belt (2) to vacuum below a prepress (3) and in front of a hot press (5). An impregnating fluid is applied on the cake and is distributed due to the vacuum at the cake. The impregnating fluid is cross-linked during pressing. The impregnating fluid is sprayed on the chip cake or fiber cake by nozzles, where the fluid influences water absorption capacity and mechanical strength properties of a pressed wooden material board. An independent claim is also included for a system for manufacturing a wooden material board i.e. wood fiberboard.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer Holzwerkstoffplatte, insbesondere einer Holzfaserplatte, bei dem ein Kuchen aus mit einem Klebstoff benetzten Holzfasern oder Holzspänen auf ein endlos umlaufendes Förderband aufgestreut und in einer Transportrichtung T zu verschiedenen Bearbeitungsstationen gefördert wird, der gestreute Kuchen in einer Vorpresse komprimiert und danach unter Druck- und Temperatureinfluss in einer Heißpresse zu einer Platte gewünschter Dicke verpresst wird.The invention relates to a method for producing a wood-based panel, in particular a wood fiber board, in which a cake sprinkled with an adhesive wood fibers or wood chips scattered on an endlessly circulating conveyor belt and conveyed in a transport direction T to various processing stations, the compressed cake in a pre-press and then pressed under pressure and temperature influence in a hot press to a plate of desired thickness.

Ein solches Verfahren ist beispielsweise aus der DE 10 2005 033 687 A1 bekannt. Um nach diesem Verfahren eine MDF- oder HDF-Platte herzustellen, müssen zuerst lange Fasern in einem Zerfaserungsschnitt hergestellt werden, was in einem vorgelagerten Prozess oder unmittelbar vor der Anlage zur Herstellung der Holzfaserplatten erfolgen kann. Die groben, langen Holzfasern werden dann mit Zuschlagstoffen, wie beispielsweise Flammschutzmitteln und Hydrophobiermitteln beaufschlagt. Anschließend wird Bindemittel (Harnstoff-Formaldehyd-Leim) über eine Blowline zugegeben und die Fasern dann mit entsprechenden Zuschlagstoffen und der Faserbeleimung über einen Stromrohrtrockner getrocknet. Anschließend wird das Fasergemisch über eine Streueinrichtung zu einem endlosen Kuchen auf das endlos umlaufende Förderband aufgestreut. Der lose abgestreute Fasergemisch-Kuchen wird dann von dem Förderband einer kalten Vorpresse zugeführt und eine kalte Vorverdichtung des Faservlieses erreicht. Anschließend wird das Faservlies wieder über das Förderband einer kontinuierlichen Heißpresse zugeführt, in der es zu einer Platte gewünschter Dicke heiß verpresst wird. Die Pressbänder sind vorteilhafterweise mit einem Trennmittel beschichtet, um ein Anhaften der gebildeten Platten zu verhindern. In einem nächsten Verfahrensschritt werden die endlos hergestellten Platten dann formatiert und zu Einzelplatten aufgetrennt und anschließend konfektioniert.Such a method is for example from the DE 10 2005 033 687 A1 known. In order to produce an MDF or HDF board according to this method, first long fibers must be produced in a defibering cut, which can be done in an upstream process or immediately before the plant for producing the wood fiber boards. The coarse, long wood fibers are then applied with additives, such as flame retardants and water repellents. Subsequently, binder (urea-formaldehyde glue) is added via a blowline and the fibers are then dried with appropriate additives and the fiber sizing via a power tube dryer. Subsequently, the fiber mixture is sprinkled on a spreading device to an endless cake on the endless circulating conveyor belt. The loosely sprinkled mixed fiber cake is then fed from the conveyor belt to a cold pre-press and cold pre-compaction of the fiber web is achieved. Subsequently, the nonwoven fabric is returned to the conveyor belt of a continuous hot press in which it is hot pressed to a plate of desired thickness. The press belts are advantageously coated with a release agent to prevent adhesion of the prevent plates formed. In a next process step, the endlessly produced plates are then formatted and separated into individual plates and then assembled.

Bei der Herstellung von MDF (mitteldichte Faserplatte) oder HDF (hochdichte Faserplatte) ist es häufig gewünscht, dass das Endprodukt bestimmte Eigenschaften besitzt, die für weitere Produktionsschritte und/oder die Nutzung relevant sind. Solche Eigenschaft kann beispielsweise die Leitfähigkeit sein, die für eine Faserplatte entweder beim Pulverlackieren der Platte selbst eine Rolle spielt oder gewünscht wird, wenn die Platte als Trägerplatte für Laminat-Fußbodenpaneele verwendet werden soll und der Fußboden antistatische Eigenschaften aufweisen muss. Die Leitfähigkeit kann durch Zugabe von Salzen im Herstellungsprozess, beispielsweise im Refinerprozess, erfolgen. Eine weitere gewünschte Eigenschaft kann eine brandhemmende Ausgestaltung sein. Weil beim Trocknen der Holzfasern in der Blowline relativ hohe Temperaturen auf das Gemisch der vorbehandelten Holzfasern einwirken, treten leider häufig Wechselwirkungen der zugegebenen Salze mit anderen Bestandteilen auf.When manufacturing MDF (Medium Density Fiberboard) or HDF (High Density Fiberboard), it is often desired that the final product have certain properties that are relevant to further production steps and / or use. Such property may be, for example, the conductivity that is involved or desired for a fiberboard either in powder coating the panel itself or when the panel is to be used as a laminate flooring panel support and the flooring must have antistatic properties. The conductivity can be achieved by adding salts in the manufacturing process, for example in the refining process. Another desired property may be a fire retardant design. Unfortunately, as the wood fibers in the blowline dry relatively high temperatures on the mixture of pretreated wood fibers, interactions of the added salts with other components often occur.

Ein weiterer Nachteil ist, dass alle Holzfasern behandelt werden, egal ob dies nötig ist oder nicht. Um diesen Nachteil auszugleichen, wird in der DE 199 63 203 A1 vorgeschlagen, zum Herstellen von Laminatfußbodenpaneelen, zunächst eine Trägerplatte aus lignozellulosehaltigem Holzwerkstoff herzustellen, die zumindest bereichsweise mit einem Imprägniermittel imprägniert wird, wobei das Imprägniermittel in die Trägerplatte eindringt bzw. diese durchtränkt. Anschließend wird die Trägerplatte in den imprägnierten Bereichen geschnitten und für eine Weiterverarbeitung an den Rändern jeweils mit einem Randprofil versehen. Durch die Imprägnierung der Randbereiche sollen Laminatfußbodenpaneele bereitgestellt werden, die gegenüber Feuchtigkeit und Nässe widerstandsfähiger sind.Another disadvantage is that all wood fibers are treated, no matter if necessary or not. To compensate for this disadvantage, is in the DE 199 63 203 A1 proposed, for the production of laminate flooring panels, first to produce a support plate made of lignocellulose-containing wood material, which is at least partially impregnated with an impregnating agent, wherein the impregnating agent penetrates into the support plate or impregnates this. Subsequently, the carrier plate is cut in the impregnated areas and provided for further processing at the edges in each case with an edge profile. By impregnating the edge areas, laminate flooring panels are to be provided which are more resistant to moisture and moisture.

Die Herstellung solcher Trägerplatten ist sehr zeitaufwendig, da das Einziehen des Imprägniermediums in die Platte eine gewisse Zeit benötigt. Außerdem muss, um eine gleichmäßige Imprägnierung sicherzustellen, die Oberseite der Trägerplatte gleichmäßig mit dem Imprägniermedium benetzt werden. Dichteschwankungen innerhalb der Trägerplatte führen zu einer ungleichmäßigen Verteilung der Imprägnierung, was von außen aber nicht erkennbar ist, sodass die Gefahr besteht, dass später aus der Trägerplatte hergestellte Paneele, insbesondere im Kantenbereich, in den Feuchtigkeit in den verlegten Fußboden eindringen kann, nicht ausreichend imprägniert sind.The preparation of such carrier plates is very time-consuming, since the drawing of the impregnation medium in the plate takes a certain amount of time. It also needs to be one ensure even impregnation, the top of the support plate are evenly wetted with the impregnating medium. Density fluctuations within the support plate lead to an uneven distribution of the impregnation, which is not recognizable from the outside, so that there is a risk that later produced panels from the support plate, especially in the edge area, can penetrate into the moisture in the laid floor, not sufficiently impregnated are.

Von dieser Problemstellung ausgehend soll das eingangs beschriebene Verfahren so verbessert werden, dass eine schnelle und sichere Imprägnierung der Holzwerkstoffplatte mit verschiedensten Imprägniermedien möglich ist.Starting from this problem, the method described above is to be improved so that a quick and safe impregnation of the wood-based panel with various impregnation is possible.

Zur Problemlösung zeichnet sich ein gattungsgemäßes Verfahren dadurch aus, dass der Kuchen auf dem Förderband hinter der Vorpresse und vor der Heißpresse einem Vakuum ausgesetzt wird, und gleichzeitig ein Imprägniermedium auf den Faserkuchen aufgetragen wird, das sich infolge des Vakuums im Faserkuchen verteilt.To solve the problem, a generic method is characterized in that the cake on the conveyor belt behind the pre-press and before the hot press is exposed to a vacuum, and at the same time an impregnating medium is applied to the fiber cake, which is distributed due to the vacuum in the fiber cake.

Durch diese Ausgestaltung erfolgt die Imprägnierung zu einem Zeitpunkt innerhalb des Herstellungsprozesses, zu dem noch eine hohe Porosität der Oberfläche vorhanden ist, was dazu führt, dass das Imprägniermedium einfach in den Kuchen eingesaugt werden und sich dort gleichmäßig verteilen kann.With this configuration, the impregnation takes place at a time within the manufacturing process, to which a high porosity of the surface is still present, which means that the impregnating medium can be easily sucked into the cake and evenly distributed there.

Vorzugsweise wird das Vakuum unterhalb des Faserkuchens angelegt und das Imprägniermedium von oben auf den Faserkuchen aufgetragen.Preferably, the vacuum is applied underneath the fiber cake and the impregnation medium applied to the fiber cake from above.

Das Imprägniermedium kann flüssig oder pulverförmig sein.The impregnation medium can be liquid or powdery.

Wenn das Imprägniermedium flüssig ist, kann es mittels Düsen auf den Faserkuchen aufgesprüht werden.If the impregnation medium is liquid, it can be sprayed onto the fiber cake by means of nozzles.

Dadurch, dass der Faserkuchen während der Imprägnierung durch das Förderband transportiert wird, kann die Vorrichtung zum Aufbringen des Imprägniermediums ortsfest angeordnet sein, was den Aufbau der Fertigungsstraße vereinfacht und ihre Kosten reduziert.Characterized in that the fiber cake is transported during the impregnation by the conveyor belt, the device for applying the impregnation medium can be arranged stationary, which simplifies the construction of the production line and reduces its cost.

Die Imprägnierung wird zumindest teilflächig aufgebracht. Bei einer teilflächigen Aufbringung entstehen Bereiche mit/ohne Imprägnierung (Vergütung), wobei die vergüteten Bereiche gegenüber nicht vergüteten Bereichen abweichende Eigenschaften aufweisen. Das Imprägniermedium kann beispielsweise die Wasseraufnahmefähigkeit oder die Festigkeitswerte der fertig gepressten Holzwerkstoffplatte beeinflussen.The impregnation is applied at least partially. In the case of part-surface application, areas are created with / without impregnation (tempering), the tempered areas having deviating properties in relation to non-tempered areas. The impregnation medium can influence, for example, the water absorption capacity or the strength values of the finished-pressed wood-based panel.

Vorzugsweise erfolgt beim Heißpressen durch die aufgebrachte Wärme eine chemische Vernetzung des Imprägniermediums.Preferably, during hot pressing by the applied heat, chemical crosslinking of the impregnating medium takes place.

Eine Anlage zur Herstellung einer Holzwerkstoffplatte mit einem in einer Transportrichtung endlos umlaufenden Förderband, einer Streuvorrichtung zum Streuen eines Holzspäne- oder Holzfaserkuchens auf das Förderband, einer in Transportrichtung dahinter angeordneten Vorpresse, in der der gestreute Kuchen komprimiert wird und einer dahinter vorgesehenen Heißpresse, in der der komprimierte Kuchen unter Druck- und Temperatureinfluss zu einer Platte gewünschter Dicke gepresst wird, zeichnet sich aus durch eine in Transportrichtung hinter der Vorpresse und vor der Heißpresse angeordnete Imprägnierstation.A plant for producing a wood-based panel with a conveyor belt endlessly circulating in a transport direction, a scattering device for spreading a wood chips or wood fiber cake on the conveyor belt, a pre-press arranged downstream in the transport direction, in which the scattered cake is compressed and a hot press behind it, in the The compressed cake is pressed under the influence of pressure and temperature to a plate of desired thickness, characterized by an arranged in the transport direction behind the pre-press and before the hot press impregnation station.

Die Imprägnierstation besteht vorzugsweise aus einer unterhalb des Förderbandes angeordneten Vakuumstation und einem oberhalb des Förderbandes angeordneten Auftragsaggregat für ein Imprägniermedium.The impregnation station preferably consists of a vacuum station arranged below the conveyor belt and an application unit arranged above the conveyor belt for an impregnating medium.

Dabei ist es vorteilhaft, wenn das Förderband Vakuumkanäle aufweist, die vorzugsweise durch eine Perforation erzeugt sind, seitlich neben dem Förderband sich in Transportrichtung über die Länge der Imprägnierstation erstreckende Bleche zur seitlichen Begrenzung des Vakuums vorgesehen sind.It is advantageous if the conveyor belt has vacuum channels, which are preferably produced by a perforation, laterally next to the conveyor belt in the transport direction extending over the length of the impregnation station extending sheets are provided for lateral limitation of the vacuum.

Das Auftragsaggregat ist vorzugsweise ortsfest angeordnet und insbesondere vorzugsweise durch Düsen gebildet. Die Anzahl der Düsen bestimmt sich durch die Art der gewünschten Imprägnierung. Die Düsen können zueinander parallel beabstandet über die volle Breite des Späne- oder Faserkuchens angeordnet sein oder nur partiell, beispielsweise am Rand.The application unit is preferably arranged stationary and in particular preferably formed by nozzles. The number of nozzles is determined by the nature of the desired impregnation. The nozzles may be arranged parallel to one another over the full width of the chip or fiber cake or only partially, for example at the edge.

Wenn die Bleche, die seitlich an dem Späne- oder Faserkuchen anliegen und seitlich das Vakuum begrenzen und somit verhindern, dass sich im Randbereich durch das seitliche Eindringen von Luft Inhomogenitäten bei der Imprägnierung ergeben können, Teil der Auftragsaggregate sind, wird die konstruktive Ausgestaltung der Imprägniereinrichtung vereinfacht.If the sheets that rest laterally on the chip or fiber cake and laterally limit the vacuum and thus prevent inhomogeneities in the impregnation can result in the edge region by the lateral ingress of air, are part of the application units, the structural design of the impregnating simplified.

Mit Hilfe einer Zeichnung soll ein Ausführungsbeispiel der Erfindung nachfolgend näher beschrieben werden.With the aid of a drawing, an embodiment of the invention will be described in more detail below.

Es zeigt:

Figur 1 -
die Draufsicht auf die Anlage;
Figur 2 -
den Schnitt entlang der Linie II-II nach Figur 1.
It shows:
FIG. 1 -
the top view of the plant;
FIG. 2 -
the section along the line II-II after FIG. 1 ,

In der Streustation 1 werden die mit einem Leim, vorzugsweise einem Harnstoff-Formaldehyd-Leim, benetzten Holzfasern oder Holzspäne auf das in Transportrichtung T endlos umlaufend angetriebene Förderband 2 zu einem Kuchen 6 aufgestreut. In der Vorpresse 3 wird der Kuchen 6 komprimiert, also kalt vorverdichtet. Zwischen der Vorpresse 3 und der Heißpresse 5, in der der komprimierte Kuchen 6 unter hohem Druck und hoher Temperatur zu einer Holzwerkstoffplatte gewünschter Dicke verpresst wird, ist eine Imprägnierstation 4 integriert, die aus einer unter dem Förderband 2 angeordneten Vakuumstation 12 und einem über dem Förderband 2 angeordneten Auftragsaggregat, wie beispielsweise Düsen 7, 8, besteht. Die Vakuumstation 12 und die Auftragsaggregate 7, 8 sind stationär und unbeweglich.In the scattering station 1, the wood fibers or wood chips wetted with a glue, preferably a urea-formaldehyde glue, are sprinkled onto the conveyor belt 2, which is endlessly driven in the transport direction T, to form a cake 6. In the pre-press 3, the cake 6 is compressed, so cold pre-compressed. Between the pre-press 3 and the hot press 5, in which the compressed cake 6 is pressed under high pressure and high temperature to a wood-based panel of desired thickness, an impregnation station 4 is integrated, consisting of a below the conveyor belt 2 arranged vacuum station 12 and one above the conveyor belt 2 arranged application unit, such as nozzles 7, 8, consists. The vacuum station 12 and the application units 7, 8 are stationary and immovable.

Das Förderband 2 ist perforiert, sodass sich Vakuumkanäle ausbilden, durch die das auf die Oberseite des komprimierten Kuchens 6 aufgesprühte Imprägniermedium von der Vakuumstation 12 angesaugt werden kann. Seitlich an den Auftragsaggregaten sind Bleche 9, 10 vorgesehen, die den Kuchen 6 seitlich begrenzen und dafür sorgen, dass keine Luft von der Seite in den Kuchen 6 eingesaugt werden kann. Die Bleche 9, 10 reichen vorzugsweise über die gesamte Länge der Imprägnierstation 4. Die Bleche 9, 10 sind Teil eines geschlossenen Rahmens 11, der die Imprägnierstation 4 nach außen umschließt und die Vakuumstation 12 ebenso aufnimmt wie das Auftragsaggregat. In der Zeichnung sind für das Auftragsaggregat beispielhaft zwei Düsen 7, 8 dargestellt. Je nach Imprägnierzweck wird eine gewünschte Anzahl an Düsen in gewünschter Verteilung innerhalb der Imprägnierstation vorgesehen werden. In der Imprägnierstation 4 läuft das Förderband 2 über ein luftdurchlässiges Rahmenteil 13.The conveyor belt 2 is perforated, so that vacuum channels form, by means of which the impregnating medium sprayed onto the upper side of the compressed cake 6 can be sucked by the vacuum station 12. Side of the coating units plates 9, 10 are provided, which limit the cake 6 side and ensure that no air from the side can be sucked into the cake 6. The metal sheets 9, 10 preferably extend over the entire length of the impregnating station 4. The metal sheets 9, 10 are part of a closed frame 11 which encloses the impregnating station 4 to the outside and the vacuum station 12 receives as well as the application unit. In the drawing, two nozzles 7, 8 are exemplified for the application unit. Depending on the impregnation purpose, a desired number of nozzles in the desired distribution be provided within the impregnation station. In the impregnation station 4, the conveyor belt 2 runs over an air-permeable frame part 13.

Als Imprägniermedium können brandhemmende Partikel ebenso wie gegen Insektenbefall schützende Partikel verwendet werden. Auch können Farben als Imprägniermedium verwendet werden, um den Kuchen 6 gezielt einzufärben. Durch Aufbringen eines erhitzten Imprägniermediums kann der Kuchen 6 erwärmt und damit die Produktionsgeschwindigkeit gesteigert werden. Zur Erwärmung des Kuchens 6 kann auch erhitzte Luft eingegeben werden.As the impregnation medium, fire retardant particles as well as insect repellent protective particles can be used. Also, colors can be used as the impregnation medium to colorize the cake 6 targeted. By applying a heated impregnating medium, the cake 6 can be heated and thus the production speed can be increased. For heating the cake 6 also heated air can be entered.

Claims (15)

Verfahren zur Herstellung einer Holzwerkstoffplatte, insbesondere einer Holzfaserplatte, bei dem ein Kuchen (6) aus mit einem Klebstoff benetzten Holzfasern oder Holzspänen auf ein endlos umlaufendes Förderband (2) aufgestreut und in einer Transportrichtung T zu verschiedenen Bearbeitungsstationen gefördert wird, der gestreute Kuchen (6) in einer Vorpresse (3) komprimiert und danach unter Druck- und Temperatureinfluss in einer Heißpresse (5) zu einer Platte gewünschter Dicke verpresst wird, dadurch gekennzeichnet, dass der Späne- oder Faserkuchen (6) auf dem Förderband (2) hinter der Vorpresse (3) und vor der Heißpresse (5) einem Vakuum ausgesetzt wird, und gleichzeitig ein Imprägniermedium auf den Kuchen (6) aufgetragen wird, das sich infolge des Vakuums im Kuchen (6) verteilt.Method for producing a wood-based panel, in particular a wood-fiber board, in which a cake (6) of wood fibers or wood shavings wetted with an adhesive is scattered on an endlessly circulating conveyor belt (2) and conveyed to various processing stations in a transport direction T, the scattered cake (6 ) is compressed in a pre-press (3) and then pressed under pressure and temperature influence in a hot press (5) to a plate of desired thickness, characterized in that the swarf or fiber cake (6) on the conveyor belt (2) behind the pre-press (3) and before the hot press (5) is subjected to a vacuum, and at the same time an impregnating medium is applied to the cake (6), which spreads due to the vacuum in the cake (6). Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Vakuum unterhalb des Faser- oder Spänekuchens (6) angelegt und das Imprägniermedium von oben auf den Späne- oder Faserkuchen (6) aufgetragen wird.A method according to claim 1, characterized in that the vacuum applied below the fiber or chip cake (6) and the impregnating medium is applied from the top of the chip or fiber cake (6). Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Imprägniermedium flüssig ist.A method according to claim 1 or 2, characterized in that the impregnating medium is liquid. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Imprägnierflüssigkeit mittels Düsen (7, 8) auf den Späne- oder Faserkuchen (6) aufgesprüht wird.A method according to claim 3, characterized in that the impregnating liquid is sprayed by means of nozzles (7, 8) on the chip or fiber cake (6). Verfahren nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Imprägnierung zumindest teilflächig aufgebracht wird.Method according to one or more of the preceding claims, characterized in that the impregnation is applied at least part of the area. Verfahren nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Imprägniermedium die Wasseraufnahmefähigkeit der fertig gepressten Holzwerkstoffplatte beeinflusst.Method according to one or more of the preceding claims, characterized in that the impregnation medium influences the water absorption capacity of the finished pressed wood-based panel. Verfahren nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Imprägniermedium die Festigkeitswerte der gepressten Holzwerkstoffplatte beeinflusst.Method according to one or more of the preceding claims, characterized in that the impregnation medium influences the strength values of the pressed wood-based panel. Verfahren nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass beim Heißpressen das Imprägniermedium vernetzt wird.Method according to one or more of the preceding claims, characterized in that during hot pressing, the impregnation medium is crosslinked. Holzwerkstoffplatte hergestellt nach einem oder mehreren der vorstehenden Ansprüche.Wood material board produced according to one or more of the preceding claims. Anlage zur Herstellung einer Holzwerkstoffplatte mit einem in Transportrichtung T endlos umlaufenden Förderband (2), einer Streuvorrichtung (1) zum Streuen eines Holzspäne- oder Holzfaserkuchens (6) auf das Förderband (2), einer in Transportrichtung T dahinter angeordneten Vorpresse (3), in der der gestreute Kuchen (6) komprimiert wird und einer dahinter vorgesehenen Heißpresse (5), in der der komprimierte Kuchen (6) unter Druck und Temperatur zu einer Platte gewünschter Dicke gepresst wird, gekennzeichnet durch eine in Transportrichtung T hinter der Vorpresse (3) und vor der Heißpresse (5) angeordnete Imprägnierstation (4).Plant for producing a wood-based panel with a continuous conveyor belt (2) in the direction of transport T, a spreading device (1) for spreading a wood chips or wood fiber cake (6) onto the conveyor belt (2), a pre-press (3) arranged in the transport direction T, in which the scattered cake (6) is compressed and a hot press (5) provided behind it, in which the compressed cake (6) is pressed under pressure and temperature to a plate of desired thickness, characterized by a transport direction T behind the pre-press (3 ) and in front of the hot press (5) arranged impregnation station (4). Anlage nach Anspruch 10, dadurch gekennzeichnet, dass die Imprägnierstation (4) aus einer unterhalb des Förderbandes (2) angeordneten Vakuumstation und einem oberhalb des Förderbandes (2) angeordneten Auftragsaggregat (7, 8) für ein Imprägniermedium besteht, das Förderband (2) Vakuumkanäle aufweist und seitlich neben dem Förderband (2) sich in Transportrichtung T über die Länge der Imprägnierstation erstreckende Bleche (9, 10) zur seitlichen Begrenzung des Vakuums vorgesehen sind.Plant according to claim 10, characterized in that the impregnation station (4) consists of a vacuum station arranged below the conveyor belt (2) and an application unit (7, 8) arranged above the conveyor belt (2) for an impregnation medium, the conveyor belt (2) being vacuum channels and laterally next to the conveyor belt (2) in the transport direction T over the length of the impregnation station extending sheets (9, 10) are provided for laterally limiting the vacuum. Anlage nach Anspruch 11, dadurch gekennzeichnet, dass das Auftragsaggregat (7, 8) ortsfest angeordnet ist.Plant according to claim 11, characterized in that the application unit (7, 8) is arranged stationary. Anlage nach Anspruch 11 oder 12, dadurch gekennzeichnet, dass das Auftragsaggregat Düsen (7, 8) aufweist.Plant according to claim 11 or 12, characterized in that the application unit has nozzles (7, 8). Anlage nach Anspruch 11, dadurch gekennzeichnet, dass die Bleche (9, 10) Teil des Auftragsaggregates sind.Plant according to claim 11, characterized in that the sheets (9, 10) are part of the application unit. Anlage nach einem der Ansprüche 11 bis 14, dadurch gekennzeichnet, dass die Vakuumkanäle durch eine Perforation des Förderbandes (2) gebildet sind.Installation according to one of claims 11 to 14, characterized in that the vacuum channels are formed by a perforation of the conveyor belt (2).
EP09005468.5A 2009-04-17 2009-04-17 Method of producing a wood fibreboard Active EP2241426B1 (en)

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EP09005468.5A EP2241426B1 (en) 2009-04-17 2009-04-17 Method of producing a wood fibreboard
PL16151741T PL3028829T3 (en) 2009-04-17 2009-04-17 Plant for manufacturing a wooden panel
ES16151741T ES2738596T3 (en) 2009-04-17 2009-04-17 Installation for the manufacture of a wood-based board
EP16151741.2A EP3028829B1 (en) 2009-04-17 2009-04-17 Plant for manufacturing a wooden panel
PL09005468.5T PL2241426T3 (en) 2009-04-17 2009-04-17 Method of producing a wood fibreboard
ES09005468.5T ES2585367T3 (en) 2009-04-17 2009-04-17 Procedure for manufacturing a wood composite plate

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WO2019210940A1 (en) 2018-05-02 2019-11-07 Xylo Technologies Ag Method and apparatus for producing a board for production of panels, board for production of panels, method and apparatus for producing panels, and panel producible by the method
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EP4286149A1 (en) * 2022-05-31 2023-12-06 SWISS KRONO Tec AG Method of manufacturing osb panels and osb panel manufacturing device

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PL3028829T3 (en) 2019-10-31
ES2585367T3 (en) 2016-10-05
EP3028829B1 (en) 2019-06-05
ES2738596T3 (en) 2020-01-23
EP3028829A1 (en) 2016-06-08
EP2241426B1 (en) 2016-05-04

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