EP2168738A1 - Method for manufacturing a wood fibre board and wood fibre board production device - Google Patents

Method for manufacturing a wood fibre board and wood fibre board production device Download PDF

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Publication number
EP2168738A1
EP2168738A1 EP09012140A EP09012140A EP2168738A1 EP 2168738 A1 EP2168738 A1 EP 2168738A1 EP 09012140 A EP09012140 A EP 09012140A EP 09012140 A EP09012140 A EP 09012140A EP 2168738 A1 EP2168738 A1 EP 2168738A1
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EP
European Patent Office
Prior art keywords
wood fiber
raw
fiber board
aqueous liquid
fiberboard
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EP09012140A
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German (de)
French (fr)
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EP2168738B1 (en
Inventor
Norbert Kalwa
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Flooring Technologies Ltd
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Flooring Technologies Ltd
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Priority to PL09012140T priority Critical patent/PL2168738T3/en
Publication of EP2168738A1 publication Critical patent/EP2168738A1/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
    • B27N1/003—Pretreatment of moulding material for reducing formaldehyde gas emission
    • 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
    • B27N7/00—After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity

Definitions

  • the invention relates to a method for producing a fiberboard. According to a second aspect, the invention relates to a Holzmaschineplattenherstellvorraum and a wood fiber board.
  • MDF medium-density fiberboard
  • fibreboards are combined in a variety of applications with other materials, such as wood. It may be due to different moisture and / or moisture changes in the materials to default.
  • the raw wood fiber boards leave the press in this process with lowered, but still relatively high temperature, so that there is behind the press to moisture loss by evaporation or evaporation. These moisture losses behind the press are also not evenly distributed over the raw wood fiber board and the raw wood fiber board then has undesirable moisture gradients.
  • the invention has for its object to overcome disadvantages in the prior art, in which the thickness of the wood-based panel defined increases and also their emission of formaldehyde and / or volatile organic compounds (VOC) is reduced.
  • the invention solves the problem by a method for producing a fiberboard comprising the steps of (a) pressing a fibrous web into a raw fiberboard, (b) applying an aqueous liquid to at least portions of a first side of the raw fiberboard and (c) applying a fibrous web Underpressure at least on parts of a second side opposite the first side, so that the aqueous liquid is drawn in / or through the raw fiberboard.
  • the invention solves the problem by a wood fiber plate manufacturing apparatus comprising (a) an applicator adapted to apply an aqueous liquid to at least portions of a first side of the green fiberboard and (b) a suction device to apply a negative pressure to at least portions one of the first side opposite second side, so that the aqueous liquid is pressed into or through the wood fiber plate.
  • the invention solves the problem by a wood fiber board, which is produced by a method according to the invention.
  • An advantage of the invention is that the moisture in the raw fiberboard can be adjusted as desired. Delays in the subsequent use of wood fiber board are thus largely excluded.
  • the press can also be operated with fibers of optimum humidity for the press. This increases the productivity of the press and increases the quality of the wood-based panel.
  • the raw wood fiber board can be moistened exactly at the places where the moisture is not sufficient.
  • some parts of the raw wood fiber board for example later edges of the wood fiber board, are provided with an impregnating agent.
  • a high moisture content in these areas would be a hindrance if such impregnation liquids are hydrophobic and a high humidity hinders the wetting with the impregnating agent.
  • the invention exactly the area can be moistened, which is not impregnated.
  • the introduction of the aqueous liquid cools the raw wood fiber board. Therefore, if the aqueous liquid is applied directly behind the press, then otherwise usual waiting time for cooling the raw wood fiber board is eliminated.
  • the moisture content of the finished wood fiber board is also from the weather, such as a fluctuating ambient temperature or a fluctuating ambient humidity, independent, so that always a reproducible result is obtained.
  • the plate is less vulnerable.
  • the invention can be implemented with technically simple means and enables high process reliability. If at least a portion of the aqueous liquid is drawn through the raw fiberboard, it is also possible to expel any pollutants present, such as formaldehyde.
  • the object is understood by the raw wood fiber board, which is obtained by the hot pressing of the nonwoven fabric. After pressing and / or squeezing the aqueous liquid is then spoken of the finished wood fiber board. As a rule, further process steps are carried out before completion of the wood fiber boards, such as, for example, grinding, impregnation, cutting, coating and profiling of the edges.
  • the aqueous liquid is applied, is meant any process step which brings the aqueous liquid in the vicinity of the raw fiberboard so that it can be sucked into or through the raw fiberboard.
  • the application may be spraying, rinsing, vapor deposition, brushing, rolling or the like.
  • the aqueous liquid is understood in particular to mean any water-based liquid whose predominant part consists of water, the aqueous liquid in particular being able to consist essentially completely of water.
  • the aqueous liquid contains biocidal substances, but this is not necessary and must not be desirable.
  • the aqueous liquid preferably has a content of biocides which is zero or so small that the biocidal effect in the finished fiberboard panel caused by the penetration or squeezing of the aqueous liquid is negligible.
  • the aqueous liquid is preferably crosslinker-free. Because impregnation is expensive and desired only in the peripheral areas, the aqueous liquid is usually also impregnation-free. Usually, therefore, the aqueous liquid will consist of more than 95%, in particular more than 97%, of water.
  • the negative pressure In order for the application of the negative pressure to cause the applied aqueous liquid to be sucked into or through the raw fiberboard as efficiently as possible, it is particularly favorable if the negative pressure is applied exactly on the opposite side of the surface to which the aqueous liquid is applied , In particular, the negative pressure is applied there and only there.
  • the application of the aqueous liquid and the application of the negative pressure take place immediately after the pressing of the fibrous web to the raw fiberboard. This advantageously ensures that the raw wood fiber board is cooled, so that they can be further processed faster.
  • a predetermined amount of liquid of the aqueous liquid is applied, which is determined so that the fiberboard has a predetermined final humidity after an end of the application of the negative pressure.
  • the predetermined amount of liquid is chosen so that the final moisture after performing the method is two to five percentage points above that which has the raw wood fiber board immediately behind the press for pressing the nonwoven fabric.
  • the method is particularly advantageous if the raw fiberboard is bound by means of formaldehyde-containing glue, in particular urea-formaldehyde glue, and for each section of the raw fiberboard the application of the aqueous liquid and the application of the reduced pressure last less than one minute. In this way, it is ensured that on the one hand any existing excess formaldehyde and / or eroded from the wood fiber board earth. This advantageously ensures that the finished wood fiber board has a lower emission.
  • formaldehyde-containing glue in particular urea-formaldehyde glue
  • the aqueous liquid contains a surfactant.
  • the concentration is less than 1 wt .-%, in particular less than 0.5 wt .-%. Particularly suitable are 0.1% by weight of surfactant.
  • the raw fiberboard is bound by means of formaldehyde-containing glue and the process is carried out until the free formaldehyde and / or VOC is at least partially removed.
  • the process is carried out until more than half of the free formaldehyde and / or the VOC has been removed.
  • Particularly suitable is the method when the wood fiber board is an MDF or an HDF board.
  • the process is particularly economical if it is carried out continuously. This may mean, for example, that the raw fiberboard is moved during the application of the aqueous liquid or the application of the negative pressure.
  • the method according to the invention preferably also comprises the steps of grinding and / or cutting and / or painting, so that a finished wood fiber board is obtained.
  • the application of the aqueous liquid takes place at least on parts of the first side of the raw wood fiber board so that a resulting change in thickness of the raw wood fiber board is substantially uniform.
  • the change in thickness in percent in the maximum percentile is less than 25% greater than the change in thickness in percent in the minimum percentile based on the width of the raw fiberboard.
  • the application device for the wood fiber board production device is understood in particular to be any device which is designed and arranged to dispense the aqueous liquid.
  • Also known Holzmaschineplattenherstellvorraumen have, for example, spray heads with which impregnating agent can be sprayed. However, these are arranged so that they only spray the edges and / or spray a non-aqueous liquid.
  • the application device comprises a spraying device.
  • the applicator device preferably further comprises a bearing device filled with the aqueous liquid and in contact with the applicator or communicable with or connected to, for example, by switching a valve.
  • the application device comprises more than one spray head.
  • the suction device is designed to form a suction chamber, which extends substantially over the full width of the wood fiber board, with a fiber board placed on the suction device.
  • the suction device has support webs arranged in the suction space for supporting the fibreboard.
  • support devices are provided in the suction chamber, which reduce bending of the wood fiber board.
  • FIG. 1 shows a portion of a wood fiber board manufacturing apparatus with an applicator 10 and a suction device 12, which includes a suction table 14.
  • the suction table 14 has support webs 16.1, 16.2,..., Which are arranged in a suction chamber 18 and are designed to support a raw fiberboard 20.
  • the suction chamber 18 is connected to a suction line 22, which leads to a vacuum pump, not shown, via which a suction chamber pressure p s of, for example, 200 mbar can be applied in the suction chamber 18.
  • a seal 24 is provided between the marginal support web 16.1 and the raw fiberboard 20, so that the vacuum in the suction chamber 18 can be easily maintained.
  • the application device 10 comprises a spraying device 26 which is movable in a direction of movement R guided by a non-illustrated drive.
  • the sprayer 26 comprises a plurality of spray nozzles, of which FIG. 1 only the spray nozzle 28 can be seen.
  • the spraying device 26 extends across the full width of the raw fiberboard 20, which in FIG. 1 protrudes from the plane of the drawing.
  • the suction device 12 is designed so that it can also create a vacuum substantially over the full width of the raw fiberboard 20.
  • the spraying device 26 sprays aqueous liquid 30 originating from a corresponding storage container onto a surface 32 of the raw fiberboard 20. Due to the negative pressure p s in the suction chamber 18, the aqueous liquid 30 is pressed by the surrounding air through the raw fiberboard 20, so that an area 34 of increased humidity in the raw fiberboard 20 forms.
  • the raw wood fiber board 20 is sprayed along a later edge with an impregnating agent, which is also introduced by applying a negative pressure in the raw wood fiber board 20.
  • the raw wood fiber board 20 is ground and finally cut, so that a finished wood fiber board is formed.
  • the cut is made through the areas that have been provided with impregnating agent.

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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)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

The method involves pressing a non-woven fiber to a raw-wood fiberboard (20), and applying aqueous fluid (30) i.e. surface-active agent, on a part of a side of the raw-wood fiberboard. A low-pressure (ps) is applied to a part of another side resting opposite to the former side, such that the aqueous fluid is sucked in and through the raw-wood fiberboard. A preset amount of aqueous fluid is applied to the raw-wood fiberboard, such that the raw-wood fiberboard includes final moisture content after stopping the supply of the low-pressure. Independent claims are also included for the following: (1) a wood fiberboard manufacturing device comprising an applying device (2) a wood fiberboard exhibiting emission characteristics.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen einer Holzfaserplatte. Gemäß einem zweiten Aspekt betrifft die Erfindung eine Holzfaserplattenherstellvorrichtung und eine Holzfaserplatte.The invention relates to a method for producing a fiberboard. According to a second aspect, the invention relates to a Holzfaserplattenherstellvorrichtung and a wood fiber board.

Bei der Herstellung von Holzfaserplatten, insbesondere von mitteldichten Faserplatten (MDF), tritt häufig das Problem auf, dass die Faserplatten nach dem Herstellungsprozess eine Feuchte haben, die nicht der Ausgleichsfeuchte in der Nutzung entspricht. Das führt zu Dimensionsänderungen der Faserplatten oder von aus den Faserplatten hergestellten Elementen. Derartige Dimensionsänderungen müssen, beispielsweise durch das Vorsehen von Dehnungsfugen, berücksichtigt werden. Besonders wichtig sind Dimensionsänderungen bei dünnen Platten, da diese auch mit Verwerfungen reagieren können.In the production of wood fiber boards, especially medium-density fiberboard (MDF), there is often the problem that after the manufacturing process the fiberboards have a moisture which does not correspond to the equilibrium moisture content in use. This leads to dimensional changes of the fiberboard or of elements made of the fiberboard. Such dimensional changes must be taken into account, for example by the provision of expansion joints. Dimensional changes are particularly important for thin plates, as they can also react with distortions.

Außerdem werden Faserplatten in einer Vielzahl von Anwendungen mit anderen Werkstoffen, wie Holz verbunden. Dabei kann es durch unterschiedliche Feuchten und/oder Feuchteänderungen in den Werkstoffen zu Verzug kommen.In addition, fibreboards are combined in a variety of applications with other materials, such as wood. It may be due to different moisture and / or moisture changes in the materials to default.

In der Vergangenheit hat man versucht, die Feuchte durch Lagerung der Platten in Klimakammern zu erhöhen. Nachteilig hieran ist der hohe Aufwand.In the past, attempts have been made to increase the humidity by storing the plates in climatic chambers. The disadvantage of this is the high cost.

Es ist zudem bekannt, die Presse, die zum Pressen der Roh-Holzfaserplatte aus einem Faservlies verwendet wird, rückzukühlen. Es wird dann mit Holzfasern gearbeitet, die eine höhere Feuchte besitzen. Derartige Pressen arbeiten in mehreren Schritten und verpressen die Roh-Holzfaserplatte bei einer Temperatur, die oberhalb des Siedepunkts von Wasser liegt. Durch die höhere Feuchte kann es daher im letzten Drittel der Presse zu Rissen in der Roh-Holzfaserplatte kommen, weil sich so genannte Dampfspalter bilden. Deshalb wird die Presse im letzten Drittel rückgekühlt, um derartige Dampfspalter zu vermeiden. Auf diese Weise kann die Feuchte in der Holzfaserplatte erhöht, ohne dass Schäden durch Dampfspalter entstehen. Nachteilig ist aber, dass bei einem derartigen Verfahren die Presse nur mit einer reduzierten Leistung arbeiten kann. Des Weiteren verlassen die Roh-Holzfaserplatten die Presse bei diesem Verfahren zwar mit abgesenkter, dennoch aber relativ hoher Temperatur, so dass es hinter der Presse zu Feuchteverlusten durch Verdampfen bzw. Verdunsten kommt. Diese Feuchteverluste hinter der Presse sind zudem nicht gleichmäßig über die Roh-Holzfaserplatte verteilt und die Roh-Holzfaserplatte besitzt dann unerwünschte Feuchtegradienten.It is also known to recool the press used to press the raw fiberboard from a non-woven fabric. It is then worked with wood fibers, which have a higher moisture content. Such presses operate in several steps and press the raw fiberboard at a temperature above the boiling point of water lies. Due to the higher humidity, cracks in the raw wood fiber board may occur in the last third of the press, because so-called steam splitters form. Therefore, the press is recooled in the last third to avoid such Dampfspalter. In this way, the moisture in the fiberboard can be increased without causing damage by Dampfspalter. The disadvantage, however, is that in such a method, the press can only work with a reduced power. Furthermore, the raw wood fiber boards leave the press in this process with lowered, but still relatively high temperature, so that there is behind the press to moisture loss by evaporation or evaporation. These moisture losses behind the press are also not evenly distributed over the raw wood fiber board and the raw wood fiber board then has undesirable moisture gradients.

Der Erfindung liegt die Aufgabe zugrunde, Nachteile im Stand der Technik zu überwinden, bei dem die Dicke der Holzwerkstoffplatte definiert erhöht und zudem deren Emission an Formaldehyd und/oder flüchtigen organischen Verbindungen (VOC) vermindert wird.The invention has for its object to overcome disadvantages in the prior art, in which the thickness of the wood-based panel defined increases and also their emission of formaldehyde and / or volatile organic compounds (VOC) is reduced.

Die Erfindung löst das Problem durch ein Verfahren zum Herstellen einer Holzfaserplatte mit den Schritten (a) Pressen eines Faservlieses zu einer Roh-Holzfaserplatte, (b) Aufbringen einer wässrigen Flüssigkeit zumindest auf Teile einer ersten Seite der Roh-Holzfaserplatte und (c) Anlegen eines Unterdrucks zumindest an Teile einer der ersten Seite gegenüberliegenden zweiten Seite, so dass die wässrige Flüssigkeit in/oder durch die Roh-Holzfaserplatte gezogen wird.The invention solves the problem by a method for producing a fiberboard comprising the steps of (a) pressing a fibrous web into a raw fiberboard, (b) applying an aqueous liquid to at least portions of a first side of the raw fiberboard and (c) applying a fibrous web Underpressure at least on parts of a second side opposite the first side, so that the aqueous liquid is drawn in / or through the raw fiberboard.

Gemäß einem zweiten Aspekt löst die Erfindung das Problem durch eine Holzfaserplattenherstellvorrichtung mit (a) einer Aufbringvorrichtung, die eingerichtet ist zum Aufbringen einer wässrigen Flüssigkeit zumindest auf Teile einer ersten Seite der Roh-Holzfaserplatte und (b) einer Absaugvorrichtung zum Anlegen eines Unterdrucks zumindest an Teile einer der ersten Seite gegenüberliegenden zweiten Seite, so dass die wässrige Flüssigkeit in oder durch die Holzfaserplatte gedrückt wird.According to a second aspect, the invention solves the problem by a wood fiber plate manufacturing apparatus comprising (a) an applicator adapted to apply an aqueous liquid to at least portions of a first side of the green fiberboard and (b) a suction device to apply a negative pressure to at least portions one of the first side opposite second side, so that the aqueous liquid is pressed into or through the wood fiber plate.

Gemäß einem dritten Aspekt löst die Erfindung das Problem durch eine Holzfaserplatte, die nach einem erfindungsgemäßen Verfahren hergestellt ist.According to a third aspect, the invention solves the problem by a wood fiber board, which is produced by a method according to the invention.

Vorteilhaft an der Erfindung ist, dass die Feuchte in der Roh-Holzfaserplatte nach Belieben eingestellt werden kann. Verzüge bei der späteren Verwendung der Holzfaserplatte sind damit weitgehend ausgeschlossen.An advantage of the invention is that the moisture in the raw fiberboard can be adjusted as desired. Delays in the subsequent use of wood fiber board are thus largely excluded.

Es ist ein weiterer Vorteil, dass zum Anfeuchten der Roh-Holzfaserplatte nur wenig Raum und wenig Zeit benötigt wird.It is a further advantage that only little space and little time is needed to moisten the raw wood fiber board.

Vorteilhafterweise kann die Presse zudem mit Fasern der für die Presse optimalen Feuchte betrieben werden. Das steigert die Produktivität der Presse und erhöht die Qualität der Holzwerkstoffplatte.Advantageously, the press can also be operated with fibers of optimum humidity for the press. This increases the productivity of the press and increases the quality of the wood-based panel.

Ein weiterer Vorteil ist es, dass die Roh-Holzfaserplatte genau an den Stellen befeuchtet werden kann, an denen die Feuchte nicht ausreichend ist. So kann vorgesehen sein, dass manche Teile der Roh-Holzfaserplatte, beispielsweise spätere Ränder der Holzfaserplatte, mit einem Imprägniermittel versehen werden. Eine hohe Feuchte in diesen Bereichen wäre hinderlich, wenn derartige Imprägnierungsflüssigkeiten hydrophob sind und eine hohe Feuchte die Benetzung mit dem Imprägniermittel behindert. Durch die Erfindung kann genau der Bereich befeuchtet werden, der nicht imprägniert wird.Another advantage is that the raw wood fiber board can be moistened exactly at the places where the moisture is not sufficient. Thus it can be provided that some parts of the raw wood fiber board, for example later edges of the wood fiber board, are provided with an impregnating agent. A high moisture content in these areas would be a hindrance if such impregnation liquids are hydrophobic and a high humidity hinders the wetting with the impregnating agent. By the invention exactly the area can be moistened, which is not impregnated.

Vorteilhaft ist zudem, dass das Einbringen der wässrigen Flüssigkeit die Roh-Holzfaserplatte abkühlt. Wird die wässrige Flüssigkeit daher unmittelbar hinter der Presse aufgebracht, so entfällt zusätzlich sonst übliche Wartezeit auf das Abkühlen der Roh-Holzfaserplatte.It is also advantageous that the introduction of the aqueous liquid cools the raw wood fiber board. Therefore, if the aqueous liquid is applied directly behind the press, then otherwise usual waiting time for cooling the raw wood fiber board is eliminated.

Dadurch, dass die Feuchte aktiv in die Roh-Holzfaserplatte eingebracht wird, ist die Feuchte der fertigen Holzfaserplatte zudem von Witterungseinflüssen, wie beispielsweise einer schwankenden Umgebungstemperatur oder einer schwankenden Umgebungsfeuchtigkeit, unabhängig, so dass stets ein reproduzierbares Ergebnis erhalten wird. Die Platte ist weniger anfällig.The fact that the moisture is actively introduced into the raw wood fiber board, the moisture content of the finished wood fiber board is also from the weather, such as a fluctuating ambient temperature or a fluctuating ambient humidity, independent, so that always a reproducible result is obtained. The plate is less vulnerable.

Günstig ist zudem, dass die Erfindung mit technisch einfachen Mitteln umsetzbar ist und eine hohe Prozesssicherheit ermöglicht. Wird zumindest ein Teil der wässrigen Flüssigkeit durch die Roh-Holzfaserplatte hindurch gesogen, so können außerdem möglicherweise vorhandene Schadstoffe, wie beispielsweise Formaldehyd, ausgetrieben werden.It is also beneficial that the invention can be implemented with technically simple means and enables high process reliability. If at least a portion of the aqueous liquid is drawn through the raw fiberboard, it is also possible to expel any pollutants present, such as formaldehyde.

Im Rahmen der vorliegenden Beschreibung wird unter der Roh-Holzfaserplatte das Objekt verstanden, was durch das Heißpressen des Faservlieses erhalten wird. Nach dem Ein- und/oder Durchdrücken der wässrigen Flüssigkeit wird dann von der fertigen Holzfaserplatte gesprochen. In der Regel werden vor dem Fertigstellen der Holzfaserplatten noch weitere Verfahrensschritte durchgeführt, wie beispielsweise ein Schleifen, ein Imprägnieren, ein Zuschneiden, ein Beschichten und ein Profilieren der Kanten.In the context of the present description, the object is understood by the raw wood fiber board, which is obtained by the hot pressing of the nonwoven fabric. After pressing and / or squeezing the aqueous liquid is then spoken of the finished wood fiber board. As a rule, further process steps are carried out before completion of the wood fiber boards, such as, for example, grinding, impregnation, cutting, coating and profiling of the edges.

Unter dem Merkmal, dass die wässrige Flüssigkeit aufgebracht wird, wird jeder Verfahrensschritt verstanden, der die wässrige Flüssigkeit so in die Nähe der Roh-Holzfaserplatte bringt, dass sie in oder durch die Roh-Holzfaserplatte gesogen werden kann. Beispielsweise kann das Aufbringen ein Aufsprühen, Aufspülen, Aufdampfen, Aufstreichen, Aufrollen oder Ähnliches sein. Wenn davon gesprochen wird, dass durch Unterdruck die wässrige Flüssigkeit in die Roh-Holzfaserplatte gesogen wird, so ist hierunter physikalisch korrekt zu verstehen, dass die wässrige Flüssigkeit von der umgebenden Luft durch die Roh-Holzfaserplatte gedrückt wird.By the feature that the aqueous liquid is applied, is meant any process step which brings the aqueous liquid in the vicinity of the raw fiberboard so that it can be sucked into or through the raw fiberboard. For example, the application may be spraying, rinsing, vapor deposition, brushing, rolling or the like. When it is said that the aqueous liquid is sucked into the raw fiberboard by negative pressure, this is physically correct to understand that the aqueous liquid is pressed by the surrounding air through the raw fiberboard.

Unter der wässrigen Flüssigkeit wird insbesondere jede wasserbasierte Flüssigkeit verstanden, deren überwiegender Teil aus Wasser besteht, wobei die wässrige Flüssigkeit insbesondere im Wesentlichen vollständig aus Wasser bestehen kann. Es können Additive vorhanden sein, die die Eigenschaften der wässrigen Flüssigkeit auf gewünschte Weise verändern. Es ist denkbar, dass die wässrige Flüssigkeit biozide Substanzen enthält, das ist aber nicht notwendig und muss nicht erwünscht sein. So weist die wässrige Flüssigkeit bevorzugt einen Gehalt an Bioziden auf, der Null ist oder so klein, dass die durch das Ein- oder Durchdrücken der wässrigen Flüssigkeit hervorgerufene biozide Wirkung in der fertigen Holzfaserplatte zu vernachlässigen ist. Des Weiteren ist die wässrige Flüssigkeit vorzugsweise vernetzungsmittelfrei. Weil ein Imprägnieren teuer und nur in den Randbereichen gewünscht ist, ist die wässrige Flüssigkeit in der Regel zudem imprägniermittelfrei. Üblicherweise wird die wässrige Flüssigkeit also zu über 95%, insbesondere zu über 97%, aus Wasser bestehen.The aqueous liquid is understood in particular to mean any water-based liquid whose predominant part consists of water, the aqueous liquid in particular being able to consist essentially completely of water. There may be additives which alter the properties of the aqueous liquid in a desired manner. It is conceivable that the aqueous liquid contains biocidal substances, but this is not necessary and must not be desirable. So For example, the aqueous liquid preferably has a content of biocides which is zero or so small that the biocidal effect in the finished fiberboard panel caused by the penetration or squeezing of the aqueous liquid is negligible. Furthermore, the aqueous liquid is preferably crosslinker-free. Because impregnation is expensive and desired only in the peripheral areas, the aqueous liquid is usually also impregnation-free. Usually, therefore, the aqueous liquid will consist of more than 95%, in particular more than 97%, of water.

Damit das Anlegen des Unterdrucks dazu führt, dass die aufgebrachte wässrige Flüssigkeit möglichst effizient in oder durch die Roh-Holzfaserplatte gesogen wird, ist es besonders günstig, wenn der Unterdruck genau auf der gegenüberliegenden Seite derjenigen Fläche angelegt wird, auf die die wässrige Flüssigkeit aufgebracht wird. Insbesondere wird der Unterdruck dort und nur dort angelegt.In order for the application of the negative pressure to cause the applied aqueous liquid to be sucked into or through the raw fiberboard as efficiently as possible, it is particularly favorable if the negative pressure is applied exactly on the opposite side of the surface to which the aqueous liquid is applied , In particular, the negative pressure is applied there and only there.

Gemäß einer bevorzugten Ausführungsform erfolgen das Aufbringen der wässrigen Flüssigkeit und das Anlegen des Unterdrucks unmittelbar nach dem Pressen des Faservlieses zu der Roh-Holzfaserplatte. Hierdurch wird vorteilhafterweise erreicht, dass die Roh-Holzfaserplatte abgekühlt wird, so dass sie schneller weiterverarbeitet werden kann.According to a preferred embodiment, the application of the aqueous liquid and the application of the negative pressure take place immediately after the pressing of the fibrous web to the raw fiberboard. This advantageously ensures that the raw wood fiber board is cooled, so that they can be further processed faster.

Gemäß einer bevorzugten Ausführungsform ist vorgesehen, dass eine vorbestimmte Flüssigkeitsmenge der wässrigen Flüssigkeit aufgebracht wird, die so bestimmt ist, dass die Holzfaserplatte nach einem Ende des Anlegens des Unterdrucks eine vorgegebene End-Feuchte aufweist. Besonders bevorzugt wird die vorbestimmte Flüssigkeitsmenge so gewählt, dass die End-Feuchte nach dem Durchführen des Verfahrens zwei bis fünf Prozentpunkte oberhalb derjenigen Feuchte liegt, welche die Roh-Holzfaserplatte unmittelbar hinter der Presse zum Pressen des Faservlieses hat.According to a preferred embodiment it is provided that a predetermined amount of liquid of the aqueous liquid is applied, which is determined so that the fiberboard has a predetermined final humidity after an end of the application of the negative pressure. Particularly preferably, the predetermined amount of liquid is chosen so that the final moisture after performing the method is two to five percentage points above that which has the raw wood fiber board immediately behind the press for pressing the nonwoven fabric.

Beim Erhöhen der Feuchte kann es dazu kommen, dass sich einzelne Fasern in der Roh-Holzfaserplatte sich aufstellen und so aus der Oberfläche hervorstehen. Bevorzugt ist daher vorgesehen, dass das Aufbringen der wässrigen Flüssigkeit und das Anlegen des Unterdrucks vor einem Schleifen der Roh-Holzfaserplatte erfolgt. Dadurch ist auch gewährleistet, dass ein späteres Auftragen einer Lackschicht nicht zu einer Erhöhung der Oberflächenrauigkeit der Roh-Holzfaserplatte führt.When increasing the humidity, it may happen that individual fibers in the raw fiberboard set up and so protrude from the surface. It is therefore preferred that the application of the aqueous liquid and the Applying the negative pressure before grinding the raw fiberboard takes place. This also ensures that a later application of a lacquer layer does not lead to an increase in the surface roughness of the raw wood fiber board.

Besonders vorteilhaft ist das Verfahren, wenn die Roh-Holzfaserplatte mittels formaldehydhaltigem Leim, insbesondere Harnstoff-Formaldehyd-Leim, gebunden ist und für jeden Abschnitt der Roh-Holzfaserplatte das Aufbringen der wässrigen Flüssigkeit und das Anlegen des Unterdrucks insgesamt weniger als eine Minute andauert. Auf diese Weise ist sichergestellt, dass einerseits etwaig vorhandener überschüssiger Formaldehyd und/oder aus der Holzfaserplatte ausgewaschen erden. Hierdurch wird vorteilhafterweise erreicht, dass die fertige Holzfaserplatte eine geringere Emission aufweist.The method is particularly advantageous if the raw fiberboard is bound by means of formaldehyde-containing glue, in particular urea-formaldehyde glue, and for each section of the raw fiberboard the application of the aqueous liquid and the application of the reduced pressure last less than one minute. In this way, it is ensured that on the one hand any existing excess formaldehyde and / or eroded from the wood fiber board earth. This advantageously ensures that the finished wood fiber board has a lower emission.

Um ein Eindringen der wässrigen Flüssigkeit in die Roh-Holzfaserplatte zu erleichtern, kann vorgesehen sein, dass die wässrige Flüssigkeit ein Tensid enthält. Vorzugsweise ist die Konzentration kleiner als 1 Gew.-%, insbesondere kleiner als 0,5 Gew.-%. Als besonders geeignet haben sich 0,1 Gew.-% an Tensid herausgestellt.In order to facilitate penetration of the aqueous liquid into the raw fiberboard, it may be provided that the aqueous liquid contains a surfactant. Preferably, the concentration is less than 1 wt .-%, in particular less than 0.5 wt .-%. Particularly suitable are 0.1% by weight of surfactant.

Vorzugsweise ist die Roh-Holzfaserplatte mittels formaldehydhaltigen Leims gebunden und das Verfahren wird so lange durchgeführt, bis das freie Formaldehyd und/oder VOC wenigstens teilweise entfernt ist. Auf diese Weise werden besonders emissionsarme Holzfaserplatten erhalten, ohne dass auf die Vorteile von formaldehydhaltigen Leimen verzichtet werden muss. Insbesondere wird das Verfahren so lange durchgeführt, bis mehr als die Hälfte des freien Formaldehyds und/oder der VOC entfernt ist.Preferably, the raw fiberboard is bound by means of formaldehyde-containing glue and the process is carried out until the free formaldehyde and / or VOC is at least partially removed. In this way, particularly low-emission wood fiber boards are obtained without having to forego the benefits of formaldehyde-containing glues. In particular, the process is carried out until more than half of the free formaldehyde and / or the VOC has been removed.

Besonders geeignet ist das Verfahren, wenn die Holzfaserplatte eine MDF- oder eine HDF-Platte ist.Particularly suitable is the method when the wood fiber board is an MDF or an HDF board.

Besonders wirtschaftlich ist das Verfahren, wenn es kontinuierlich durchgeführt wird. Das kann beispielsweise heißen, dass die Roh-Holzfaserplatte während des Aufbringens der wässrigen Flüssigkeit oder des Anlegens des Unterdrucks bewegt wird.The process is particularly economical if it is carried out continuously. This may mean, for example, that the raw fiberboard is moved during the application of the aqueous liquid or the application of the negative pressure.

Bevorzugt umfasst das erfindungsgemäße Verfahren zudem die Schritte eines Schleifens und/oder Zuschneidens und/oder Lackierens, so dass eine fertige Holzfaserplatte erhalten wird.The method according to the invention preferably also comprises the steps of grinding and / or cutting and / or painting, so that a finished wood fiber board is obtained.

Bevorzugt erfolgt das Aufbringen der wässrigen Flüssigkeit zumindest auf Teile der ersten Seite der Roh-Holzfaserplatte so, dass eine resultierende Dickenänderung der Roh-Holzfaserplatte im Wesentlichen gleichmäßig ist. Hierunter ist insbesondere zu verstehen, dass sich die Dickenänderung in Prozent im maximalen Perzentil um weniger als 25% größer ist als die Dickenänderung in Prozent im minimalen Perzentil bezogen auf die Breite der Roh-Holzfaserplatte.Preferably, the application of the aqueous liquid takes place at least on parts of the first side of the raw wood fiber board so that a resulting change in thickness of the raw wood fiber board is substantially uniform. By this is meant in particular that the change in thickness in percent in the maximum percentile is less than 25% greater than the change in thickness in percent in the minimum percentile based on the width of the raw fiberboard.

Im Rahmen der vorliegenden Beschreibung wird unter der Aufbringvorrichtung für die erfindungsgemäße Holzfaserplattenherstellvorrichtung insbesondere jede Vorrichtung verstanden, die ausgebildet und eingerichtet ist, um die wässrige Flüssigkeit auszubringen. Auch bekannte Holzfaserplattenherstellvorrichtungen besitzen beispielsweise Sprühköpfe, mit denen Imprägniermittel aufgesprüht werden kann. Diese sind aber so eingerichtet, dass sie lediglich die Kanten einsprühen und/oder versprühen eine nicht-wässrige Flüssigkeit.In the context of the present description, the application device for the wood fiber board production device according to the invention is understood in particular to be any device which is designed and arranged to dispense the aqueous liquid. Also known Holzfaserplattenherstellvorrichtungen have, for example, spray heads with which impregnating agent can be sprayed. However, these are arranged so that they only spray the edges and / or spray a non-aqueous liquid.

Gemäß einer bevorzugten Ausführungsform umfasst die Aufbringvorrichtung eine Sprüheinrichtung. Die Aufbringvorrichtung umfasst zudem vorzugsweise eine Lagervorrichtung, die mit der wässrigen Flüssigkeit gefüllt ist und die mit der Aufbringvorrichtung in Kontakt steht oder in Verbindung oder beispielsweise durch Schalten eines Ventils in Verbindung bringbar ist.According to a preferred embodiment, the application device comprises a spraying device. The applicator device preferably further comprises a bearing device filled with the aqueous liquid and in contact with the applicator or communicable with or connected to, for example, by switching a valve.

Günstig ist es zudem, wenn die Aufbringvorrichtung mehr als einen Sprühkopf umfasst.It is also advantageous if the application device comprises more than one spray head.

Bevorzugt ist die Absaugvorrichtung ausgebildet, um mit einer auf die Absaugvorrichtung aufgelegten Holzfaserplatte einen Saugraum zu bilden, der sich im Wesentlichen über die volle Breite der Holzfaserplatte erstreckt.Preferably, the suction device is designed to form a suction chamber, which extends substantially over the full width of the wood fiber board, with a fiber board placed on the suction device.

Damit die Holzfaserplatte unter dem angelegten Unterdruck nicht nachgibt, ist bevorzugt vorgesehen, dass die Absaugvorrichtung im Saugraum angeordnete Auflagestege zum Auflagern der Holzfaserplatte besitzt. In anderen Worten sind im Saugraum Auflagervorrichtungen vorgesehen, die ein Durchbiegen der Holzfaserplatte vermindern.So that the fiberboard does not yield under the applied negative pressure, it is preferably provided that the suction device has support webs arranged in the suction space for supporting the fibreboard. In other words, support devices are provided in the suction chamber, which reduce bending of the wood fiber board.

Im Folgenden wird die Erfindung anhand eines exemplarischen Ausführungsbeispiels näher erläutert. Dabei zeigt

Figur 1
einen Teil einer erfindungsgemäßen Holzfaserplattenherstellvorrichtung, die zum Durchführen eines erfindungsgemäßen Verfahrens eingerichtet ist.
In the following, the invention will be explained in more detail with reference to an exemplary embodiment. It shows
FIG. 1
a part of a Holzfaserplattenherstellvorrichtung invention, which is adapted to perform a method according to the invention.

Figur 1 zeigt einen Teil einer Holzfaserplattenherstellvorrichtung mit einer Aufbringvorrichtung 10 und einer Absaugvorrichtung 12, die einen Saugtisch 14 umfasst. Der Saugtisch 14 besitzt Auflagestege 16.1, 16.2, ..., die in einem Saugraum 18 angeordnet sind und zum Auflagern einer Roh-Holzfaserplatte 20 ausgebildet sind. Der Saugraum 18 ist mit einer Absaugleitung 22 verbunden, die zu einer nicht eingezeichneten Vakuumpumpe führt, über die im Saugraum 18 ein Saugraumdruck ps von beispielsweise 200 mbar angelegt werden kann. FIG. 1 shows a portion of a wood fiber board manufacturing apparatus with an applicator 10 and a suction device 12, which includes a suction table 14. The suction table 14 has support webs 16.1, 16.2,..., Which are arranged in a suction chamber 18 and are designed to support a raw fiberboard 20. The suction chamber 18 is connected to a suction line 22, which leads to a vacuum pump, not shown, via which a suction chamber pressure p s of, for example, 200 mbar can be applied in the suction chamber 18.

Zwischen dem randständigen Auflagesteg 16.1 und der Roh-Holzfaserplatte 20 ist eine Dichtung 24 vorgesehen, damit das Vakuum im Saugraum 18 leicht aufrechterhalten werden kann.Between the marginal support web 16.1 and the raw fiberboard 20, a seal 24 is provided so that the vacuum in the suction chamber 18 can be easily maintained.

Die Aufbringvorrichtung 10 umfasst eine Sprüheinrichtung 26, die in eine Bewegungsrichtung R von einem nicht eingezeichneten Antrieb geführt bewegbar ist. Die Sprüheinrichtung 26 umfasst eine Vielzahl von Sprühdüsen, von der in Figur 1 nur die Sprühdüse 28 zu sehen ist. Die Sprüheinrichtung 26 erstreckt sich über die volle Breite der Roh-Holzfaserplatte 20, die in Figur 1 aus der Zeichnungsebene herausragt. Die Absaugvorrichtung 12 ist so ausgebildet, das sie ebenfalls im Wesentlichen über die volle Breite der Roh-Holzfaserplatte 20 einen Unterdruck anlegen kann.The application device 10 comprises a spraying device 26 which is movable in a direction of movement R guided by a non-illustrated drive. The sprayer 26 comprises a plurality of spray nozzles, of which FIG. 1 only the spray nozzle 28 can be seen. The spraying device 26 extends across the full width of the raw fiberboard 20, which in FIG. 1 protrudes from the plane of the drawing. The suction device 12 is designed so that it can also create a vacuum substantially over the full width of the raw fiberboard 20.

Die Sprüheinrichtung 26 sprüht aus einem entsprechenden Vorratsbehälter stammende wässrige Flüssigkeit 30 auf eine Oberfläche 32 der Roh-Holzfaserplatte 20. Durch den Unterdruck ps im Saugraum 18 wird die wässrige Flüssigkeit 30 von der umgebenden Luft durch die Roh-Holzfaserplatte 20 gedrückt, so dass sich ein Bereich 34 einer erhöhten Feuchte in der Roh-Holzfaserplatte 20 bildet.The spraying device 26 sprays aqueous liquid 30 originating from a corresponding storage container onto a surface 32 of the raw fiberboard 20. Due to the negative pressure p s in the suction chamber 18, the aqueous liquid 30 is pressed by the surrounding air through the raw fiberboard 20, so that an area 34 of increased humidity in the raw fiberboard 20 forms.

Anschließend kann die Roh-Holzfaserplatte 20 entlang eines späteren Rands mit einem Imprägniermittel besprüht, das ebenfalls durch Anlegen eines Unterdrucks in die Roh-Holzfaserplatte 20 eingebracht wird.Subsequently, the raw wood fiber board 20 is sprayed along a later edge with an impregnating agent, which is also introduced by applying a negative pressure in the raw wood fiber board 20.

Nachfolgend wird die Roh-Holzfaserplatte 20 geschliffen und schließlich geschnitten, so dass eine fertige Holzfaserplatte entsteht. Dabei erfolgt der Schnitt durch die Bereiche, die mit Imprägniermittel versehen wurden.Subsequently, the raw wood fiber board 20 is ground and finally cut, so that a finished wood fiber board is formed. The cut is made through the areas that have been provided with impregnating agent.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Aufbringvorrichtungapplicator
1212
Absaugvorrichtungsuction
1414
Saugtischsuction table
1616
Auflagestegsupport web
1818
Saugraumsuction
2020
Roh-HolzfaserplatteRaw fibreboard
2222
Absaugleitungsuction
2424
Dichtungpoetry
2626
Sprüheinrichtungspraying
2828
Sprühdüsespray nozzle
3030
wässrige Flüssigkeitaqueous liquid
3232
Oberflächesurface
3434
BereichArea
pS p s
Druck im SaugraumPressure in the suction chamber
RR
Bewegungsrichtungmovement direction

Claims (15)

Verfahren zum Herstellen einer Holzfaserplatte, mit den Schritten: (a) Pressen eines Faservlieses zu einer Roh-Holzfaserplatte (20), (b) Aufbringen einer wässrigen Flüssigkeit (30) zumindest auf Teile einer ersten Seite der Roh-Holzfaserplatte (20) und (c) Anlegen eines Unterdrucks (ps) zumindest an Teile einer der ersten Seite gegenüber liegenden zweiten Seite, so dass die wässrige Flüssigkeit (30) in und/oder durch die Roh-Holzfaserplatte (20) gesogen wird. Method for producing a wood fiber board, with the steps: (a) pressing a fibrous web into a raw fiberboard (20), (B) applying an aqueous liquid (30) at least on parts of a first side of the raw fiberboard (20) and (c) applying a negative pressure (p s ) at least to portions of a second side opposite the first side so that the aqueous liquid (30) is drawn into and / or through the raw fiberboard (20). Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass eine vorbestimmte Flüssigkeitsmenge der wässrigen Flüssigkeit (30) aufgebracht wird, die so bestimmt ist, dass die Holzfaserplatte (10) nach einem Ende des Anlegens des Unterdrucks (ps) eine vorgegebene Endfeuchte hat.Method according to one of the preceding claims, characterized in that a predetermined amount of liquid of the aqueous liquid (30) is applied, which is determined so that the wood fiber board (10) after an end of the application of the negative pressure (p s ) has a predetermined final moisture content. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Aufbringen der wässrigen Flüssigkeit (30) und das Anlegen des Unterdrucks (ps) vor einem Schleifen der Roh-Holzfaserplatte (20) erfolgt.Method according to one of the preceding claims, characterized in that the application of the aqueous liquid (30) and the application of the negative pressure (p s ) before grinding the raw wood fiber plate (20). Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass - die Roh-Holzfaserplatte (20) mittels Harnstoff-Formaldehyd-Leim gebunden ist und - für jeden Abschnitt der Roh-Holzfaserplatte (20) das Aufbringen der wässrigen Flüssigkeit (30) und das Anlegen des Unterdrucks (ps) insgesamt weniger als eine Minute andauert. Method according to one of the preceding claims, characterized in that - The raw wood fiber board (20) is bound by means of urea-formaldehyde glue and - For each section of the raw fiberboard (20), the application of the aqueous liquid (30) and the application of the negative pressure (p s ) a total of less than a minute persists. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die wässrige Flüssigkeit (30) wenigstens ein Tensid enthält.Method according to one of the preceding claims, characterized in that the aqueous liquid (30) contains at least one surfactant. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass - die Roh-Holzfaserplatte (20) mittels Harnstoff-Formaldehyd-Leim gebunden ist und - das Verfahren so lange durchgeführt wird, bis das freie Formaldehyd und/oder flüchtigen organischen Verbindungen (VOC) wenigstens teilweise entfernt ist. Method according to one of the preceding claims, characterized in that - The raw wood fiber board (20) is bound by means of urea-formaldehyde glue and - The process is carried out until the free formaldehyde and / or volatile organic compounds (VOC) is at least partially removed. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Holzfaserplatte (10) eine MDF- oder eine HDF-Platte ist.Method according to one of the preceding claims, characterized in that the wood fiber board (10) is an MDF or an HDF board. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die wässrige Flüssigkeit (30) im Wesentlichen imprägniermittelfrei ist.Method according to one of the preceding claims, characterized in that the aqueous liquid (30) is substantially impregnation-free. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Verfahren kontinuierlich durchgeführt wird.Method according to one of the preceding claims, characterized in that the method is carried out continuously. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die wässrige Flüssigkeit (30) so aufgebracht wird, dass sich die Roh-Holzfaserplatte (20) abkühlt.Method according to one of the preceding claims, characterized in that the aqueous liquid (30) is applied so that the raw wood fiber board (20) cools down. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Aufbringen der wässrigen Flüssigkeit (30) zumindest auf Teile der ersten Seite der Roh-Holzfaserplatte (20) so erfolgt, dass eine resultierende Dickenänderung der Roh-Holzfaserplatte (20) im Wesentlichen gleichmäßig ist.Method according to one of the preceding claims, characterized in that the application of the aqueous liquid (30) at least on parts of the first side of the raw wood fiber board (20) takes place so that a resulting change in thickness of the raw wood fiber board (20) is substantially uniform , Holzfaserplattenherstellvorrichtung mit (a) einer Aufbringvorrichtung (10), die eingerichtet ist zum Aufbringen einer wässrigen Flüssigkeit (30) zumindest auf Teile einer erste Seite der Roh-Holzfaserplatte (20) und (b) einer Absaugvorrichtung (12) zum Anlegen eines Unterdrucks (ps) zumindest an Teile einer der ersten Seite gegenüber liegenden zweiten Seite, so dass die wässrige Flüssigkeit (30) in und/oder durch die Roh-Holzfaserplatte (20) gedrückt wird. Wood fiber board manufacturing device with (A) an application device (10) which is adapted for applying an aqueous liquid (30) at least on parts of a first side of the raw fiberboard (20) and (B) a suction device (12) for applying a negative pressure (p s ) at least to parts of a second side opposite the first side, so that the aqueous liquid (30) is pressed into and / or through the raw fiberboard (20) , Holzfaserplattenherstellvorrichtung nach Anspruch 12, dadurch gekennzeichnet, dass die Absaugvorrichtung (12) ausgebildet ist, um mit einer auf die Absaugvorrichtung (12) aufgelegten Holzfaserplatte (10) einen Saugraum (18) zu bilden, der sich im Wesentlichen über die volle Breite der Holzfaserplatte (10) erstreckt.Fiberboard manufacturing apparatus according to claim 12, characterized in that the suction device (12) is designed to form a suction chamber (18) with a suction device (12) applied to the wood fiber plate (10) extending substantially over the full width of the wood fiber board ( 10). Holzfaserplatte (10), die nach einem Verfahren nach einem der Ansprüche 1 bis 10 hergestellt ist, wobei bei der Holzfaserplatte lignocellulose Fasern mit einem Harnstoff-Formaldehyd-Klebstoff durch Heißpressen verbunden werden, wobei diese ein verbessertes Emissionsverhalten mit einem geringeren Emissionsniveau an Formaldehyd bezogen auf Reaktionsreste und/oder Rückspaltungen der Bestandteile des Klebstoffs und/oder an flüchtigen organischen Verbindungen (VOC) bezogen auf Holzinhaltsstoffe aufweist.A wood fiber board (10) made by a process according to any one of claims 1 to 10, wherein in the wood fiber board lignocellulosic fibers are bonded to a urea-formaldehyde adhesive by hot pressing, which has an improved emission performance with a lower level of formaldehyde emission Reaction residues and / or cleavages of the constituents of the adhesive and / or volatile organic compounds (VOC) based on wood ingredients. Holzfaserplatte nach Anspruch 14, dadurch gekennzeichnet, dass das Emissionsniveau um 0,3% bis 0,5% verringert ist.Wood fiber board according to claim 14, characterized in that the emission level is reduced by 0.3% to 0.5%.
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RU2586145C2 (en) * 2011-01-06 2016-06-10 Флоринг Текнолоджиз Лтд. Method and device for specific action on technological properties of separate areas of sheet material, pre-compacted material in form of non-woven fabric or material in form of fibrous mass
EP3184272A3 (en) * 2011-01-06 2017-08-09 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
EP3693144A1 (en) * 2011-01-06 2020-08-12 Flooring Technologies Ltd. Method and device for the partial treatment of the surface or the total cross-section of a wooden material plate or a precompacted wooden material web or wood fibre odour
EP3059056A1 (en) 2015-02-23 2016-08-24 Basf Se Method for producing wood fibres and wood fibre boards
US20160303761A1 (en) * 2015-04-17 2016-10-20 Cefla Deutschland Gmbh Method for Producing a Fiber Board Having Improved Chemical and Mechanical Properties
EP3098043A1 (en) * 2015-04-17 2016-11-30 Cefla Deutschland GmbH Method for producing a fibreboard with improved mechanical and chemical properties
WO2019162145A1 (en) 2018-02-20 2019-08-29 Basf Se Method for producing wood fiberboards
US12005602B2 (en) 2018-02-20 2024-06-11 Basf Se Method for producing wood fiberboards
EP4166294A1 (en) * 2021-10-18 2023-04-19 SWISS KRONO Tec AG Method for producing a wood panel and wood panel production device
WO2023066802A1 (en) 2021-10-18 2023-04-27 SWISS KRONO Tec AG Method for producing a wooden composite board, and device for producing a wooden composite board

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DE102008049132A1 (en) 2010-04-08
ES2541140T3 (en) 2015-07-16
PL2168738T3 (en) 2015-09-30

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