EP3028829B1 - Plant for manufacturing a wooden panel - Google Patents

Plant for manufacturing a wooden panel Download PDF

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Publication number
EP3028829B1
EP3028829B1 EP16151741.2A EP16151741A EP3028829B1 EP 3028829 B1 EP3028829 B1 EP 3028829B1 EP 16151741 A EP16151741 A EP 16151741A EP 3028829 B1 EP3028829 B1 EP 3028829B1
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Prior art keywords
conveyor belt
cake
vacuum
wood
impregnating
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EP16151741.2A
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German (de)
French (fr)
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EP3028829A1 (en
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Flooring Technologies Ltd
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Flooring Technologies Ltd
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Priority to PL16151741T priority Critical patent/PL3028829T3/en
Priority to ES16151741T priority patent/ES2738596T3/en
Priority to EP16151741.2A priority patent/EP3028829B1/en
Publication of EP3028829A1 publication Critical patent/EP3028829A1/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 plant for producing a wood-based panel, in particular a wood fiber board, with which a cake sprinkled with an adhesive wood fibers or wood shavings is 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.
  • a method for producing a wood-based panel is for example from 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.
  • the nonwoven fabric is again on the conveyor belt of a continuous hot press supplied 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 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 DE 103 14 974 A1 discloses a plant for the production of moldings from lignocellulose-containing fibers, which consists of a gluing device, a fiber mat forming device, a curing device, an impregnating device and a finishing device.
  • From the DE 2050 530 A1 is a plant known, with a foamable polyurethane composition can be applied to the top of a plate.
  • the plate is transported by two conveyor belts arranged one behind the other. Between the two conveyor belts, a vacuum device is provided, with which the feed can be sucked into the plate by means of spray nozzles arranged transversely to the transport path of the plate.
  • the vacuum device may have sidewalls to increase the effectiveness of the vacuum.
  • a device is known with which he can pre-heat a mat of wood shavings or wood chips.
  • sieve bands are provided above and below the mat. Water vapor is introduced into the mat via the sieve belts or removed therefrom. The sieve belts serve to pre-compact the mat. For positive guidance of the water vapor, a vacuum can be applied.
  • the impregnation station consists of a vacuum station arranged below the conveyor belt and an application unit arranged above the conveyor belt for an impregnation medium.
  • the conveyor belt has vacuum channels, which are preferably produced by a perforation, and laterally next to the conveyor belt extending in the transport direction over the length of the impregnation are provided sheets for laterally limiting 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 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 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 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 will be provided in the desired distribution 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)

Description

Die Erfindung betrifft eine Anlage zur Herstellung einer Holzwerkstoffplatte, insbesondere einer Holzfaserplatte, mit der 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 plant for producing a wood-based panel, in particular a wood fiber board, with which a cake sprinkled with an adhesive wood fibers or wood shavings is 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 Verfahren zur Herstellung einer Holzwerkstoffplatte 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.A method for producing a wood-based panel is for example from 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 again on the conveyor belt of a continuous hot press supplied 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 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. In addition, to ensure a uniform impregnation, the top of the carrier plate must be 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.

Die DE 103 14 974 A1 offenbart eine Anlage zur Herstellung von Formkörpern aus lignocellulosehaltigen Fasern, die aus einer Beleimvorrichtung, einer Fasermattenformvorrichtung, einer Aushärtevorrichtung, einer Imprägniervorrichtung und einer Endbearbeitungsvorrichtung besteht.The DE 103 14 974 A1 discloses a plant for the production of moldings from lignocellulose-containing fibers, which consists of a gluing device, a fiber mat forming device, a curing device, an impregnating device and a finishing device.

Aus der DE 2050 530 A1 ist eine Anlage bekannt, mit der eine schaumfähige Polyurethanmasse auf die Oberseite einer Platte aufgetragen werden kann. Die Platte wird von zwei hintereinander angeordneten Transportbändern transportiert. Zwischen den beiden Transportbändern ist eine Vakuumvorrichtung vorgesehen, mit der die Zufuhr mittels quer zum Transportweg der Platte angeordnete Sprühdüsen aufgebrachte Polyurethanmasse in die Platte eingesaugt werden kann. Die Vakuumvorrichtung kann Seitenwände aufweisen, um die Wirksamkeit des Vakuums zu erhöhen.From the DE 2050 530 A1 is a plant known, with a foamable polyurethane composition can be applied to the top of a plate. The plate is transported by two conveyor belts arranged one behind the other. Between the two conveyor belts, a vacuum device is provided, with which the feed can be sucked into the plate by means of spray nozzles arranged transversely to the transport path of the plate. The vacuum device may have sidewalls to increase the effectiveness of the vacuum.

Aus der EP 1 710 061 A1 ist eine Vorrichtung bekannt, mit er eine Matte aus Holzspänen oder Holzschnitzeln vorgewärmt werden kann. Hierzu sind oberhalb und unterhalb der Matte Siebbänder vorgesehen. Über die Siebbänder wird Wasserdampf in die Matte eingeleitet bzw. aus dieser wieder abgeführt. Die Siebbänder dienen zur Vorverdichtung der Matte. Zur Zwangsführung des Wasserdampfes kann ein Vakuum angelegt werden.From the EP 1 710 061 A1 a device is known with which he can pre-heat a mat of wood shavings or wood chips. For this purpose, sieve bands are provided above and below the mat. Water vapor is introduced into the mat via the sieve belts or removed therefrom. The sieve belts serve to pre-compact the mat. For positive guidance of the water vapor, a vacuum can be applied.

Von dieser Problemstellung ausgehend soll eine Anlage geschaffen werden, mit der das eingangs beschriebene Verfahren so verbessert werden kann, dass eine schnelle und sichere Imprägnierung der Holzwerkstoffplatte mit verschiedensten Imprägniermedien möglich ist.Based on this problem, a system is to be created with which the method described above can be improved so that a fast and safe impregnation of the wood-based panel with a variety of impregnation is possible.

Zur Problemlösung zeichnet sich 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 kalt vorverdichtet wird und einer dahinter vorgesehenen Heißpresse, in der der kalt vorverdichtete Kuchen unter Druck- und Temperatureinfluss zu einer Platte gewünschter Dicke gepresst wird, aus durch eine in Transportrichtung hinter der Vorpresse und vor der Heißpresse angeordnete Imprägnierstation.To solve the problem, a system for producing a wood-based panel with a continuous circulating in a transport direction conveyor belt, a spreading device for spreading a wood chips or wood fiber cake on the conveyor belt, a pre-press arranged in the transport direction, in which the scattered cake is cold precompressed and one behind provided hot press, in which the cold pre-compressed cake is pressed under pressure and temperature influence to a plate of desired thickness, by a arranged in the transport direction behind the pre-press and before the hot press impregnation station.

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

Das Förderband weist Vakuumkanäle auf, die vorzugsweise durch eine Perforation erzeugt sind, und seitlich neben dem Förderband sind in Transportrichtung über die Länge der Imprägnierstation erstreckende Bleche zur seitlichen Begrenzung des Vakuums vorgesehen.The conveyor belt has vacuum channels, which are preferably produced by a perforation, and laterally next to the conveyor belt extending in the transport direction over the length of the impregnation are provided sheets for laterally limiting 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 der erfindungsgemäßen Anlage ist es möglich, 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.With the system according to the invention, it is possible 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.

Weil das Imprägniermedium flüssig ist, kann es mittels Düsen auf den Faserkuchen aufgesprüht werden.Because 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.

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 plan 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 will be provided in the desired distribution 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 (5)

  1. Plant for producing a wood-based board, having a conveyor belt (2) circulating endlessly in the transport direction T, a scattering device (1) for scattering a wood chip or wood fibre cake (6) onto the conveyor belt (2), a prepress (3) which is arranged after the latter in the transport direction T and in which the scattered cake (6) can be cold precompressed, and a hot press (5) which is provided thereafter and in which the cake (6) precompressed cold can be pressed under pressure and temperature to form a board of desired thickness, wherein an impregnating station (4) is arranged after the prepress (3) and before the hot press (5) in the transport direction T, said impregnating station consisting of a vacuum station arranged underneath the conveyor belt (2) and an application unit for an impregnating liquid, which application unit is arranged above the conveyor belt (2) and has nozzles (7, 8), and wherein the conveyor belt (2) has vacuum channels, and plates (9, 10) extending in the transport direction T over the length of the impregnating station are provided laterally beside the conveyor belt (2) to limit the vacuum laterally.
  2. Plant according to Claim 1, characterized in that the application unit is arranged in a fixed location.
  3. Plant according to Claim 2, characterized in that the plates (9, 10) are part of the application unit.
  4. Plant according to one of Claims 1 to 3, characterized in that the vacuum channels are formed by a perforation of the conveyor belt (2).
  5. Plant according to Claim 1, characterized in that the vacuum can be applied below the fibre or chip cake (6) and the impregnating liquid can be applied from above to the chip or fibre cake (6).
EP16151741.2A 2009-04-17 2009-04-17 Plant for manufacturing a wooden panel Active EP3028829B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
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

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP09005468.5A EP2241426B1 (en) 2009-04-17 2009-04-17 Method of producing a wood fibreboard
EP16151741.2A EP3028829B1 (en) 2009-04-17 2009-04-17 Plant for manufacturing a wooden panel

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP09005468.5A Division-Into EP2241426B1 (en) 2009-04-17 2009-04-17 Method of producing a wood fibreboard
EP09005468.5A Division EP2241426B1 (en) 2009-04-17 2009-04-17 Method of producing a wood fibreboard

Publications (2)

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EP3028829A1 EP3028829A1 (en) 2016-06-08
EP3028829B1 true EP3028829B1 (en) 2019-06-05

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EP16151741.2A Active EP3028829B1 (en) 2009-04-17 2009-04-17 Plant for manufacturing a wooden panel
EP09005468.5A Active EP2241426B1 (en) 2009-04-17 2009-04-17 Method of producing a wood fibreboard

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EP09005468.5A Active EP2241426B1 (en) 2009-04-17 2009-04-17 Method of producing a wood fibreboard

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Publication number Priority date Publication date Assignee Title
PT2474399T (en) * 2011-01-06 2019-05-13 Flooring Technologies Ltd Method and device for targeted influence of the technological characteristics of individual areas of a wooden board, a pre-compressed wooden fabric or a wood fibre cake
DE102012100800B4 (en) 2012-01-31 2021-08-05 Flooring Technologies Ltd. Process for the impregnation of material panels, impregnated material panel and system for the production of an impregnated material panel
CN108177209B (en) * 2017-12-29 2019-03-29 南京林业大学 A kind of method of wood materials compression compact
US20210170627A1 (en) 2018-05-02 2021-06-10 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
US11518061B2 (en) 2018-05-02 2022-12-06 Xylo Technologies Ag Method and apparatus for producing a board
ES2983542T3 (en) 2022-05-31 2024-10-23 SWISS KRONO Tec AG OSB board manufacturing process and OSB board manufacturing device

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DE2050530A1 (en) * 1970-01-29 1971-08-05 Nat Gypsum Co Impregnating porous board with binding agent
JPH10323809A (en) * 1997-05-27 1998-12-08 Matsushita Electric Works Ltd Manufacture of water resistive dense fiber board
DE19963203A1 (en) 1999-12-27 2001-09-20 Kunnemeyer Hornitex Plate section, especially a laminate floor plate, consists of a lignocellulose containing material with a coated surface and an edge impregnation agent
US6620459B2 (en) * 2001-02-13 2003-09-16 Houston Advanced Research Center Resin-impregnated substrate, method of manufacture and system therefor
DE10314974B4 (en) * 2003-04-02 2010-08-26 Glunz Ag Process for the production of moldings with a coherent lignocellulose-containing fibers having shaping structure and moldings
DE102005016408A1 (en) * 2005-04-08 2006-10-12 Dieffenbacher Gmbh + Co. Kg Method for the continuous preheating of a nonwoven or a mat and apparatus for carrying out the method
DE102005033687A1 (en) 2005-07-19 2007-01-25 Steico Ag Wooden fiber boards made of ligno-cellulose bound with binding agent mixed with additional material if desired; method to produce same whereby fibers are shredded, fluid binding agents added, fibers dried and materials added in
US7507360B2 (en) * 2005-11-29 2009-03-24 Timtek, Llc System and method for the preservative treatment of engineered wood products

Also Published As

Publication number Publication date
ES2585367T3 (en) 2016-10-05
ES2738596T3 (en) 2020-01-23
PL3028829T3 (en) 2019-10-31
EP2241426B1 (en) 2016-05-04
EP3028829A1 (en) 2016-06-08
PL2241426T3 (en) 2016-12-30
EP2241426A1 (en) 2010-10-20

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