EP3098043B1 - Method for producing a fibreboard with improved mechanical and chemical properties - Google Patents

Method for producing a fibreboard with improved mechanical and chemical properties Download PDF

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Publication number
EP3098043B1
EP3098043B1 EP16165123.7A EP16165123A EP3098043B1 EP 3098043 B1 EP3098043 B1 EP 3098043B1 EP 16165123 A EP16165123 A EP 16165123A EP 3098043 B1 EP3098043 B1 EP 3098043B1
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EP
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Prior art keywords
fiber board
wood fiber
pressure difference
impregnating material
board
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EP16165123.7A
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German (de)
French (fr)
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EP3098043A1 (en
Inventor
Gerhard Stahl
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Cefla Deutschland GmbH
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Cefla Deutschland GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/08—Impregnating by pressure, e.g. vacuum impregnation
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/0278—Processes; Apparatus involving an additional treatment during or after impregnation
    • B27K3/0285—Processes; Apparatus involving an additional treatment during or after impregnation for improving the penetration of the impregnating fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K2200/00—Wooden materials to be treated
    • B27K2200/10—Articles made of particles or fibres consisting of wood or other lignocellulosic material

Definitions

  • the invention relates to a method for producing a fibreboard with improved chemical and mechanical properties, e.g. B. fiberboard or hemp panels and glass and rock wool panels.
  • a wood fiber board is used as an example.
  • wood fiber boards for the production of pieces of furniture, door leaves and the like. These consist of pressed wood fiber boards, which usually have a density of 450 to 1000 kg/m 3 after the pressing process.
  • pressed wood fiber boards which usually have a density of 450 to 1000 kg/m 3 after the pressing process.
  • the processing of the wood fiber board is even more complex if a structured surface such as the milling of grooves, cassettes and the like takes place.
  • This method also has the disadvantage that before the wood fiber board is processed, the locations of the processing must be precisely defined. It is not possible to produce a wood fiber board with this method, where the type of processing, such as the grooves and contours actually milled into the board, is only determined later.
  • the object of the invention is to create a method for producing a fiberboard, in particular a hardened wood fiberboard, which can be processed individually, ie in which the processing contours can only be determined at a later point in time.
  • the method according to the invention is discussed in more detail below on the basis of the preferred use of wood fiber boards, the method also being suitable for boards made of other materials which can be treated with liquid hardening agent.
  • liquid hardening material is applied over the entire surface to an upper side of the fiber board.
  • a liquid hardening material consisting essentially of a post-crosslinking polymer is used.
  • 400-800 ml, in particular 500-600 ml liquid of impregnating material per square meter with a panel thickness of 6-10 mm, in particular 7-9 mm, is applied to the upper side of the wood fiber panel. With a smaller panel thickness, relatively less impregnating material is applied. If the panel thickness is reduced by half, the amount of impregnation agent applied is also reduced by 50%.
  • impregnation material of 200-400 ml, in particular 250-300 ml, is applied per square meter.
  • board thickness and thus also increasing desired penetration depth of the impregnating material, correspondingly more impregnating material is applied over the entire surface of the upper side of the fiber board.
  • a pressure difference is generated between the top and bottom of the fiberboard in order to suck and/or press the impregnating material into the wood fiber board over a large area.
  • the required amount of impregnation material can be significantly reduced according to the invention.
  • impregnation material is applied to both upper sides.
  • the plate is turned over in a preferred development of the invention in a next step, so that the previous underside becomes the new upper side and the previous upper side becomes the new underside. Then again material is applied to the now new upper side, the amount of material in turn corresponding to the application amount described above as a function of the panel thickness.
  • the mechanical properties of the panel can be significantly improved.
  • the panel preferably has a density of 700-1100 kg/m 3 , in particular 800-1000 kg/m 3 .
  • a density of 700-1100 kg/m 3 in particular 800-1000 kg/m 3 .
  • the times for which a pressure difference is applied are 70-110 s, in particular 80-100 s, for the first sucking in, i.e. before the plate is turned over , this material is then sucked in or pressed in for 10-25 s, in particular 15-20 s. Despite the impregnation material being sucked in or pressed in from both sides, only a very small amount of material is sucked out of the plate. This amount is negligible.
  • the pressure difference is preferably generated by means of a vacuum chamber extending over the entire underside of the wood fiber board. Both the full-area application and the full-area generation of negative pressure take place essentially over the entire surface of the plate.
  • a post-crosslinking polymer is used as the impregnation material.
  • a two-component material can be used that hardens z.
  • the polyurethane is provided with an isocyanate that reacts with water.
  • the water is the residual moisture content of the MDF board.
  • the reaction time is adjusted to be very long and is preferably about 3 days.
  • the panels can be stacked after treatment and do not stick.
  • the hardening material used preferably has a viscosity of 10 to 80 s measured in a DIN 4 measuring cup.
  • the preferred pressure difference between the top and bottom of the wood fiber board is preferably in the range of 0.8 to 1.2 bar, this being dependent in particular on the air pressure. Since it is particularly preferred that only suction takes place, the maximum pressure difference is in the range of approx. 1 bar, since it is an open system.
  • the provision of only one vacuum chamber on the underside of the wood fiber board has the advantage that an overpressure chamber on the top side of the wood fiber board can be omitted.
  • the differential pressure is generated by at least one vacuum pump, which is connected to the vacuum chamber.
  • the at least one vacuum pump or the plurality of vacuum pumps together have a suction capacity of 700 to 1200 m 3 /h and in particular 800 to 1000 m 3 /h. This suction power refers to an area of 1 m 2 .
  • the impregnation or hardening material is sucked or pressed over a region of at least 3 mm, in particular completely, into the wood fiber board. This is particularly the case when the impregnating material is applied and pressed in or sucked in from both sides.
  • the suction time is between 20 and 90 s.
  • a top side 14 of a wood fiber board 10 produced by a conventional pressing method is sprayed with hardened material in a first station with the aid of a spray device 12 .
  • the spray head 16 which extends over the entire width of the wood fiber board 10 , is moved continuously in the direction of an arrow 18 over the entire length of the wood fiber board 10 .
  • the wood fiber board is transported in the direction of an arrow 22 to the next processing station.
  • the wood fiber board rests on a vacuum chamber 26 formed by a, for example, rectangular frame 24 running along the edge of the wood fiber board 10 .
  • the vacuum chamber 26 is connected to three vacuum pumps 28 .
  • the vacuum pumps 28 generate a pressure of approximately 1000 mbar in the vacuum pump chamber 26 and thus on an underside 25 of the wood fiber board 10 over a period of approximately 90 seconds.
  • the hardened material arranged on the upper side 14 of the wood fiber board 10 is sucked in over the entire surface.
  • the wood fiber board 10 can then be individually processed after the material has hardened. In this way, with very good quality results, an individual profiling and structuring of the surface of the wood fiber board can take place by introducing grooves and the like. Time-consuming, in particular manual, regrinding is no longer necessary before coating the surface with paint or the like.
  • the wood fiber board is turned over on top 14 so that bottom 25 becomes the new top and top 14 becomes the new bottom. This is followed by a complete application of liquid hardening material and a corresponding sucking in or pressing in as described above.
  • sucking in or pressing in takes place over a significantly shorter period of time of in particular 10-25 s, and particularly preferably 15-20 s.

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

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer Faserplatte mit verbesserten chemischen und mechanischen Eigensachten, dies können z. B. Holzfaserplatten oder Hanfplatten sowie Glas und Steinwolleplatten sein. Als Anwendungsbeispiel wird eine Holzfaserplatte verwendet.The invention relates to a method for producing a fibreboard with improved chemical and mechanical properties, e.g. B. fiberboard or hemp panels and glass and rock wool panels. A wood fiber board is used as an example.

Zur Herstellung von Möbelstücken, Türblättern und dergleichen ist es bekannt Holzfaserplatten zu verwenden. Diese bestehen aus verpressten Holzfaserplatten, die nach dem Pressvorgang üblicherweise eine Dichte von 450 bis 1000 kg/m3 aufweisen. Bei einer herkömmlichen, nicht teilweise durch nachvernetzendes Polyurethan nachbehandelten Holzfaserplatte ist es erforderlich diese zur Erzeugung einer hochwertigen Lackoberfläche mehrfach, das heißt üblicherweise fünf bis sechsfach zu lackieren, wobei zwischen den einzelnen Lackierschritten Schleifarbeiten erforderlich sind. Noch aufwendiger ist das Bearbeiten der Holzfaserplatte, sofern eine strukturierte Oberfläche wie beispielsweise das Einfräsen von Nuten, Kassetten und dergleichen erfolgt. Hierdurch wird die Oberfläche der Holzfaserplatte beispielsweise im Bereich der Nuten, Kassetten poröser, da man durch die dichtere Deckschicht in die weniger dichte Mittellage fräst. Durch das Lackieren z. B. mit wasserlöslichen UV-Lacken, Wasserlacken oder dergleichen stellen sich die Fasern auf, so dass eine aufwendige Nachbearbeitung häufig durch händisches Schleifen erforderlich ist. Derartige Verfahren sind beispielsweise in US 2002/155223 sowie EP 2 623 282 beschrieben.It is known to use wood fiber boards for the production of pieces of furniture, door leaves and the like. These consist of pressed wood fiber boards, which usually have a density of 450 to 1000 kg/m 3 after the pressing process. In the case of a conventional wood fiber board that has not been partially post-treated with post-crosslinking polyurethane, it is necessary to paint it several times, ie usually five to six times, to produce a high-quality paint surface, with sanding work being required between the individual painting steps. The processing of the wood fiber board is even more complex if a structured surface such as the milling of grooves, cassettes and the like takes place. This makes the surface of the wood fiber board more porous, for example in the area of the grooves and coffers, since the denser top layer is milled into the less dense middle layer. By painting z. B. with water-soluble UV paints, water-based paints or the like, the fibers stand up so that a complex post-processing is often required by manual grinding. Such methods are, for example, in U.S. 2002/155223 as well as EP 2 623 282 described.

Des Weiteren ist es bekannt, die gesamte Holzfaserplatte mit entsprechendem Imprägniermaterial wie nachvernetzendem Polyurethan zu tränken. Hierbei wird eine große Menge des entsprechenden Imprägniermaterials auf die Platte aufgebracht und dringt in diese ein und härtet aus. Hierdurch kann die Anzahl der aufzubringenden Lackschichten zur Erzeugung einer hochwertigen Lackoberfläche reduziert werden. Auch ist es sodann möglich, eine profilierte Oberfläche durch Einfräsen von Nuten oder dergleichen zu erzeugen, wobei die aufwendigen insbesondere händisch durchzuführenden Schleifschritte reduziert werden können. Ein derartiges Verfahren ist jedoch unwirtschaftlich, da eine sehr große Menge an teurem Härtmaterial verwendet werden muss. Es ist daher bekannt, das entsprechende Härtmaterial nur partiell auf eine Oberseite der Holzfaserplatte aufzubringen und durch Anlegen von Unterdruck an der Unterseite der Holzfaserplatte in diese einzusaugen, wie beispielsweise in DE 19 963 203 beschrieben. Bei einem derartigen Verfahren ist es erforderlich mindestens 1000 ml an Härtmaterial pro Quadratmeter aufzubringen.Furthermore, it is known to saturate the entire wood fiber board with an appropriate impregnating material such as post-crosslinking polyurethane. Here, a large amount of the appropriate impregnating material is applied to the plate and penetrates into it and hardens. As a result, the number of paint layers to be applied to produce a high-quality paint surface can be reduced. It is then also possible to produce a profiled surface by milling in grooves or the like, in which case the complicated grinding steps, which in particular have to be carried out manually, can be reduced. However, such a method is uneconomical because a very large amount of expensive hardening material must be used. It is therefore known to apply the corresponding hardening material only partially to an upper side of the wood fiber board and to suck it into the wood fiber board by applying negative pressure to the underside, as for example in DE 19 963 203 described. With such a method it is necessary to apply at least 1000 ml of hardening material per square meter.

Dieses Verfahren hat ferner den Nachteil, dass vor der Bearbeitung der Holzfaserplatte, die Stellen der Bearbeitung exakt definiert sein müssen. Es ist nicht möglich mit diesem Verfahren eine Holzfaserplatte herzustellen, bei der die Art der Bearbeitung wie die tatsächlich in die Platte eingefrästen Nuten und Konturen erst später festgelegt wird.This method also has the disadvantage that before the wood fiber board is processed, the locations of the processing must be precisely defined. It is not possible to produce a wood fiber board with this method, where the type of processing, such as the grooves and contours actually milled into the board, is only determined later.

Aufgabe der Erfindung ist es, ein Verfahren zur Herstellung einer Faserplatte, insbesondere einer gehärteten Holzfaserplatte zu schaffen, die individuell bearbeitet werden kann, das heißt bei der erst zu einem späteren Zeitpunkt die Bearbeitungskonturen festgelegt werden können.The object of the invention is to create a method for producing a fiberboard, in particular a hardened wood fiberboard, which can be processed individually, ie in which the processing contours can only be determined at a later point in time.

Die Lösung der Aufgabe erfolgt erfindungsgemäß durch die Merkmale des Anspruchs 1.The object is achieved according to the invention by the features of claim 1.

Nachstehend wird das erfindungsgemäße Verfahren anhand der bevorzugten Verwendung anhand von Holzfaserplatten näher erörtert, wobei das Verfahren auch für Platten aus anderen, mit flüssigem Härtmittel behandelbaren Materialen geeignet ist.The method according to the invention is discussed in more detail below on the basis of the preferred use of wood fiber boards, the method also being suitable for boards made of other materials which can be treated with liquid hardening agent.

Bei dem erfindungsgemäßen Verfahren zu Herstellung einer Faserplatte, insbesondere einer gehärteten Holzfaserplatte wird flüssiges Härtmaterial vollflächig auf eine Oberseite der Faserplatte aufgebracht. Erfindungsgemäß wird ein flüssiges, im Wesentlichen aus nachvernetzendem Polymer bestehendes Härtematerial verwendet. Erfindungsgemäß werden hierbei 400 - 800 ml, insbesondere 500 - 600 ml Flüssigkeit an Imprägniermaterial pro Quadratmeter bei einer Plattendicke von 6 - 10 mm, insbesondere 7 - 9 mm auf die Oberseite der Holzfaserplatte aufgebracht Bei einer geringeren Plattendicke wird verhältnismäßig weniger Imprägnierungsmaterial aufgebracht. Wird die Plattendicke auf die Hälfte reduziert, reduziert sich auch die aufgebrachte Menge an Imprägniermittel um 50 %. Es wird bei einer Plattendicke von 2 - 6 mm, insbesondere 3 - 5 mm pro Quadratmeter Imprägniermaterial von 200 - 400 ml, insbesondere 250 - 300 ml aufgebracht. Bei zunehmender Plattendicke, und somit auch zunehmender gewünschter Eindringtiefe des Imprägniermaterials, wird entsprechend mehr Imprägniermaterial vollflächig auf die Oberseite der Faserplatte aufgebracht. Im nächsten Schritt wird zwischen der Oberseite und der Unterseite der Faserplatte eine Druckdifferenz erzeugt, um das Imprägniermaterial großflächig in die Holzfaserplatte einzusaugen und/oder einzupressen. Hierdurch kann die erforderliche Menge an Imprägniermaterial erfindungsgemäß deutlich reduziert werden.In the method according to the invention for producing a fiber board, in particular a hardened wood fiber board, liquid hardening material is applied over the entire surface to an upper side of the fiber board. According to the invention, a liquid hardening material consisting essentially of a post-crosslinking polymer is used. According to the invention, 400-800 ml, in particular 500-600 ml liquid of impregnating material per square meter with a panel thickness of 6-10 mm, in particular 7-9 mm, is applied to the upper side of the wood fiber panel. With a smaller panel thickness, relatively less impregnating material is applied. If the panel thickness is reduced by half, the amount of impregnation agent applied is also reduced by 50%. With a plate thickness of 2-6 mm, in particular 3-5 mm, impregnation material of 200-400 ml, in particular 250-300 ml, is applied per square meter. With increasing board thickness, and thus also increasing desired penetration depth of the impregnating material, correspondingly more impregnating material is applied over the entire surface of the upper side of the fiber board. In the next step, a pressure difference is generated between the top and bottom of the fiberboard in order to suck and/or press the impregnating material into the wood fiber board over a large area. As a result, the required amount of impregnation material can be significantly reduced according to the invention.

Bei einer besonders bevorzugten Weiterbildung des erfindungsgemäßen Verfahrens erfolgt ein Aufbringen von Imprägniermaterial auf beiden Oberseiten.In a particularly preferred development of the method according to the invention, impregnation material is applied to both upper sides.

Nach erfolgtem Aufbringen des Materials auf eine erste Oberseite und anlegen der Druckdifferenz erfolgt daher in bevorzugter Weiterbildung der Erfindung in einem nächsten Schritt ein Wenden der Platte, so dass die bisherige Unterseite zur neuen Oberseite und die bisherige Oberseite zur neuen Unterseite wird. Anschließend wird wiederum Material auf die jetzt neue Oberseite aufgebracht, wobei die Materialmenge wiederum in Abhängigkeit der Plattendicke der vorstehend beschriebenen Auftragsmenge entspricht.After the material has been applied to a first upper side and the pressure difference has been applied, the plate is turned over in a preferred development of the invention in a next step, so that the previous underside becomes the new upper side and the previous upper side becomes the new underside. Then again material is applied to the now new upper side, the amount of material in turn corresponding to the application amount described above as a function of the panel thickness.

Insbesondere durch Aufbringen und Einsaugen bzw. Einpressen von Imprägniermatieral von beiden Seiten können die mechanischen Eigenschaften der Platte deutlich verbessert werden.In particular, by applying and sucking in or pressing in impregnation material from both sides, the mechanical properties of the panel can be significantly improved.

Die Platte weist vorzugsweise eine Dichte von 700 - 1100 kg/m3, insbesondere 800 - 1000 kg/m3. Trotz der relativ hohen Dichte ist es mit dem erfindungsgemäßen Verfahren möglich, das Imprägnierungsmittel verhältnismäßig tief, insbesondere vollständig in die Holzfaserplatte einzusaugen. Dies hat den Vorteil, dass die mechanischen Eigenschaften der Platte stark verbessert werden, wobei nur eine geringe Menge an Imprägniermaterial eingesetzt werden muss.The panel preferably has a density of 700-1100 kg/m 3 , in particular 800-1000 kg/m 3 . Despite the relatively high density, it is possible with the method according to the invention to suck the impregnating agent relatively deeply, in particular completely, into the wood fiber board. This has the advantage that the mechanical properties of the panel are greatly improved, with only a small amount of impregnation material having to be used.

Die Zeiten, für die eine Druckdifferenz angelegt wird, betragen beim ersten Einsaugen, d.h. vor dem Wenden der Platte 70 - 110 s, insbesondere 80 - 100 s. Sofern in bevorzugter Ausführungsform ein Wenden der Platte und Aufbringen von Material auf die sodann neue Oberseite erfolgt, erfolgt das Einsaugen bzw. Einpressen dieses Material sodann für 10 - 25 s, insbesondere 15 - 20 s. Trotz des Einsaugens bzw. Einpressens von Imprägniermaterial von beiden Seiten wird nur eine sehr geringe Menge an Material aus der Platte gesaugt. Diese Menge ist vernachlässigbar.The times for which a pressure difference is applied are 70-110 s, in particular 80-100 s, for the first sucking in, i.e. before the plate is turned over , this material is then sucked in or pressed in for 10-25 s, in particular 15-20 s. Despite the impregnation material being sucked in or pressed in from both sides, only a very small amount of material is sucked out of the plate. This amount is negligible.

Vorzugsweise erfolgt das Erzeugen der Druckdifferenz mittels einer sich über die gesamte Unterseite der Holzfaserplatte erstreckenden Unterdruckkammer. Sowohl das vollflächige Aufbringen als auch das vollflächige Erzeugen von Unterdruck erfolgt hierbei im Wesentlichen über die gesamte Fläche der Platte.The pressure difference is preferably generated by means of a vacuum chamber extending over the entire underside of the wood fiber board. Both the full-area application and the full-area generation of negative pressure take place essentially over the entire surface of the plate.

Des Weiteren ist es bevorzugt, das Härtematerial vollflächig auf die Oberseite der Holzfaserplatte aufzugießen und/oder aufzusprühen. Hierdurch kann ein gleichmäßiges Auftragen des Imprägniermaterials verwirklicht werden.Furthermore, it is preferred to pour and/or spray the hardening material onto the entire surface of the upper side of the wood fiber board. This allows the impregnation material to be applied evenly.

Als Imprägniermaterial wird ein nachvernetzendes Polymer eingesetzt.A post-crosslinking polymer is used as the impregnation material.

Zusätzlich oder anstelle dieses Materials kann ein Zweikomponentenmaterial verwendet werden, das durchhärtet z. B. ein Polyurethan mit Isocyanat als Härter-Komponente.In addition to or instead of this material, a two-component material can be used that hardens z. B. a polyurethane with isocyanate as a hardener component.

Das Polyurethan ist mit einem Isocyanat versehen, der in Verbindung mit Wasser reagiert. Das Wasser ist in diesem Fall die Restfeuchte der MDF Platte. Die Reaktionszeit wird sehr lange eingestellt und beträgt vorzugsweise ca. 3 Tage. Die Platten können nach der Behandlung gestapelt werden und verkleben nicht.The polyurethane is provided with an isocyanate that reacts with water. In this case, the water is the residual moisture content of the MDF board. The reaction time is adjusted to be very long and is preferably about 3 days. The panels can be stacked after treatment and do not stick.

Das verwendete Härtmaterial weist vorzugsweise eine Viskosität von 10 bis 80 s gemessen im DIN 4 Messbecher auf.The hardening material used preferably has a viscosity of 10 to 80 s measured in a DIN 4 measuring cup.

Die bevorzugte Druckdifferenz zwischen der Oberseite und der Unterseite der Holzfaserplatte liegt vorzugsweise im Bereich von 0,8 bis 1,2 bar, wobei dies insbesondere abhängig vom Luftdruck ist. Da es besonderes bevorzugt ist, dass ausschließlich ein Einsaugen erfolgt liegt die Druckdifferenz maximal im Bereich von ca. 1 bar, da es sich um ein offenes System handelt. Das Vorsehen ausschließlich einer Unterdruckkammer auf der Unterseite der Holzfaserplatte hat den Vorteil, dass eine Überdruckkammer auf der Oberseite der Holzfaserplatte entfallen kann.The preferred pressure difference between the top and bottom of the wood fiber board is preferably in the range of 0.8 to 1.2 bar, this being dependent in particular on the air pressure. Since it is particularly preferred that only suction takes place, the maximum pressure difference is in the range of approx. 1 bar, since it is an open system. The provision of only one vacuum chamber on the underside of the wood fiber board has the advantage that an overpressure chamber on the top side of the wood fiber board can be omitted.

Des Weiteren ist es bevorzugt, dass der Differenzdruck durch mindestens eine Vakuumpumpe erzeugt wird, die mit der Unterdruckkammer verbunden ist. Hierbei weist die mindestens eine Vakuumpumpe oder die mehreren Vakuumpumpen gemeinsam eine Saugleistung von 700 bis 1200 m3/h und insbesondere 800 bis 1000 m3/h auf. Diese Saugleistung bezieht sich auf eine Fläche von 1 m2.Furthermore, it is preferred that the differential pressure is generated by at least one vacuum pump, which is connected to the vacuum chamber. In this case, the at least one vacuum pump or the plurality of vacuum pumps together have a suction capacity of 700 to 1200 m 3 /h and in particular 800 to 1000 m 3 /h. This suction power refers to an area of 1 m 2 .

Vorzugsweise wird mit Hilfe des erfindungsgemäßen Verfahrens das Imprägnier- bzw. Härtmaterial über einen Bereich von mindestens 3 mm, insbesondere vollständig in die Holzfaserplatte eingesaugt bzw. eingepresst. Dies ist insbesondere der Fall, wenn ein Aufbringen und Einpressen bzw. Einsaugen des Imprägniermaterials von beiden Seiten erfolgt.Preferably, with the aid of the method according to the invention, the impregnation or hardening material is sucked or pressed over a region of at least 3 mm, in particular completely, into the wood fiber board. This is particularly the case when the impregnating material is applied and pressed in or sucked in from both sides.

Bei dem nachstehenden bevorzugten Ausführungsbeispiel wurden sehr gute Ergebnisse erzielt:

  • Verwendete Holzfaserplatte: MDF 610 kg /m3, Plattenstärke 8 mm
  • Verwendetes Material: POLYURETHAN mit Isocyanat
  • Aushärtezeit des Härtmaterials: ca. 2 bis 3 Tage
  • Auftragen von 500 ml Härtmaterial pro Quadratmeter durch Gießen.
Very good results have been obtained in the following preferred embodiment:
  • Wood fiber board used: MDF 610 kg/m 3 , board thickness 8 mm
  • Material used: POLYURETHANE with isocyanate
  • Hardening time of the hardening material: approx. 2 to 3 days
  • Application of 500 ml hardening material per square meter by pouring.

Erzeugen von ca. 1000 mbar Unterdruck an der Unterseite der Holzfaserplatte mit Hilfe von drei Vakuumpumpen mit einer Saugleistung von je 300 m3/h bei einer Fläche der Holzfaserplatte von 1 m2.Generation of approx. 1000 mbar negative pressure on the underside of the wood fiber board with the help of three vacuum pumps with a suction capacity of 300 m 3 /h each for a surface of the wood fiber board of 1 m 2 .

In Abhängigkeit vom Luftdruck wurde ein Unterdruck von -920 mbar erreicht. Die Saugzeit beträgt je nach Eindringtiefe zwischen 20 und 90 s.Depending on the air pressure, a negative pressure of -920 mbar was reached. Depending on the penetration depth, the suction time is between 20 and 90 s.

Nachfolgend wird das erfindungsgemäße Verfahren anhand einer bevorzugten Ausführungsform einer geeigneten Vorrichtung näher erläutert.The method according to the invention is explained in more detail below using a preferred embodiment of a suitable device.

Es zeigen:

Fig. 1
eine schematische Seitenansicht einer geeigneten Vorrichtung.
Show it:
1
a schematic side view of a suitable device.

Eine durch ein herkömmliches Pressverfahren hergestellte Holzfaserplatte 10 wird in einer ersten Station mit Hilfe einer Sprüheinrichtung 12 auf einer Oberseite 14 mit Härtmaterial besprüht. Hierzu wird der sich über die gesamte Breite der Holzfaserplatte 10 erstreckende Sprühkopf 16 kontinuierlich in Richtung eines Pfeils 18 über die gesamte Länge der Holzfaserplatte 10 bewegt. Hierdurch erfolgt ein gleichmäßiges flächiges Aufbringen an Härtmaterial auf der Oberseite 14. Beispielsweise mit Hilfe von Transportrollen 20 wird die Holzfaserplatte in Richtung eines Pfeils 22 in die nächste Bearbeitungsstation transportiert.A top side 14 of a wood fiber board 10 produced by a conventional pressing method is sprayed with hardened material in a first station with the aid of a spray device 12 . For this purpose, the spray head 16 , which extends over the entire width of the wood fiber board 10 , is moved continuously in the direction of an arrow 18 over the entire length of the wood fiber board 10 . This results in a uniform, planar application of hardening material on the upper side 14. For example, with the aid of transport rollers 20, the wood fiber board is transported in the direction of an arrow 22 to the next processing station.

In der nächsten Bearbeitungsstation liegt die Holzfaserplatte auf einer durch einen beispielsweise rechteckigen am Rand der Holzfaserplatte 10 verlaufenden Rahmen 24 ausgebildeten Vakuumkammer 26 auf. Die Vakuumkammer 26 ist mit drei Vakuumpumpen 28 verbunden. Durch die Vakuumpumpen 28 wird über einen Zeitraum von ca. 90 Sekunden ein Druck von ca. 1000 mbar in der Vakuumpumpenkammer 26 und somit an einer Unterseite 25 der Holzfaserplatte 10 erzeugt. Hierdurch erfolgt ein vollflächiges Einsaugen des auf der Oberseiter 14 der Holzfaserplatte 10 angeordneten Härtmaterials.In the next processing station, the wood fiber board rests on a vacuum chamber 26 formed by a, for example, rectangular frame 24 running along the edge of the wood fiber board 10 . The vacuum chamber 26 is connected to three vacuum pumps 28 . The vacuum pumps 28 generate a pressure of approximately 1000 mbar in the vacuum pump chamber 26 and thus on an underside 25 of the wood fiber board 10 over a period of approximately 90 seconds. As a result, the hardened material arranged on the upper side 14 of the wood fiber board 10 is sucked in over the entire surface.

Anschließend kann die Holzfaserplatte 10 nach dem Aushärten des Materials individuell bearbeitet werden. Hierdurch kann bei sehr guten Qualitätsergebnissen ein individuelles Profilieren und Strukturieren der Oberfläche der Holzfaserplatte durch Einbringen von Nuten und dergleichen erfolgen. Ein aufwendiges insbesondere händisches Nachschleifen ist vor einem Beschichten der Oberfläche mit Lack oder dergleichen nicht mehr erforderlich.The wood fiber board 10 can then be individually processed after the material has hardened. In this way, with very good quality results, an individual profiling and structuring of the surface of the wood fiber board can take place by introducing grooves and the like. Time-consuming, in particular manual, regrinding is no longer necessary before coating the surface with paint or the like.

Bei einer besonders bevorzugten Weiterbildung der Erfindung erfolgt nach dem Aufbringen und Einsaugen bzw. Einpressen von Imprägniermaterial auf die Oberseite 14 ein Wenden der Holzfaserplatte, so dass die Unterseite 25 zur neuen Oberseite und die Oberseite 14 zur neuen Unterseite wird. Anschließend erfolgt wiederum ein vollständiges Aufbringen von flüssigem Härtmaterial und ein entsprechendes Einsaugen bzw. Einpressen wie vorstehend beschrieben.In a particularly preferred development of the invention, after impregnating material has been applied and sucked in or pressed in, the wood fiber board is turned over on top 14 so that bottom 25 becomes the new top and top 14 becomes the new bottom. This is followed by a complete application of liquid hardening material and a corresponding sucking in or pressing in as described above.

Der einzige wesentliche Unterschied besteht darin, dass das Einsaugen bzw. Einpressen über einen deutlich geringeren Zeitraum von insbesondere 10 - 25 s, und besonders bevorzugt 15 - 20 s erfolgt.The only essential difference is that the sucking in or pressing in takes place over a significantly shorter period of time of in particular 10-25 s, and particularly preferably 15-20 s.

Claims (11)

  1. A method for producing a fiber board, particularly a hardened wood fiber board, said method comprising the steps of:
    full-surfaced application of a liquid impregnating material, substantially consisting of a post-crosslinking polymer, onto a top side (14) of a fiber board (10),
    wherein 400 - 800 ml, particularly 500 - 600 ml of impregnating material per square meter are applied in case of a board thickness in the range of 6 - 10 mm, particularly 7-9 mm, and respectively
    wherein 200 - 400 ml, particularly 250 - 300 ml of impregnating material per square meter are applied in case of a board thickness in the range of 2 - 6 mm, particularly 3 - 5 mm, and
    generating a pressure difference between the top side (14) and a bottom side (25) of the wood fiber board (10) for sucking and/or pressing the impregnating material into the wood fiber board (10).
  2. The method according to claim 1, comprising the additional steps of:
    turning the wood fiber board (10) around,
    full-surfaced application of a liquid curing material onto a new top side (25) of the fiber board (10),
    wherein 400 - 800 ml, particularly 500 - 600 ml of impregnating material per square meter are applied in case of a board thickness in the range of 6 - 10 mm, particularly 7-9 mm, and respectively
    wherein 200 - 400 ml, particularly 250 - 300 ml of impregnating material per square meter are applied in case of a board thickness in the range of 2 - 6 mm, particularly 3 - 5 mm, and
    generating a pressure difference between the new top side (25) and the new bottom side (14) of the wood fiber board (10) for sucking and/or pressing the impregnating material into the wood fiber board (10).
  3. The method according to claim 1 or 2, wherein the density of the wood fiber board is 700 - 1100 kg/m3, particularly 800 - 1000 kg/m3.
  4. The method according to any one of claims 1-3, wherein, for the first suck-in or press-in process, the pressure difference between the top side (14) and the bottom side (25) is applied for 70 - 110 s, particularly 80 - 100 s.
  5. The method according to any one of claims 1-3, wherein, for the second suck-in or press-in process, the pressure difference between the new top side (25) and the new bottom side (14) is applied for 10 - 25 s, particularly 15 - 20 s.
  6. The method according to any one of claims 1-5, wherein the generating of the pressure difference is performed by a vacuum chamber (26) extending across the entire bottom side (25) of the fiber board (10).
  7. The method according to any one of claims 1 - 6, wherein the impregnating material is applied by casting and/or spraying onto the top side (14).
  8. The method according to any one of claims 1-7, wherein the material has a viscosity of 10 to 80 s, measured in a DIN 4 measuring jug.
  9. The method according to any one of claims 1-8, wherein the pressure difference is in the range from 0.8 to 1.2 bar.
  10. The method according to any one of claims 1-9, wherein the pressure difference is generated by at least one vacuum pump having a total suctional capacity of 700 to 1200 m3/h and particularly 800 to 1000 m3/h on a surface area of 1 m2.
  11. The method according to any one of claims 1 - 10, wherein the curing material penetrates into the fiber board (10) by at least 3 mm and preferably completely.
EP16165123.7A 2015-04-17 2016-04-13 Method for producing a fibreboard with improved mechanical and chemical properties Active EP3098043B1 (en)

Applications Claiming Priority (1)

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DE102015206941.9A DE102015206941A1 (en) 2015-04-17 2015-04-17 Method for producing a fiberboard with improved chemical and mechanical properties

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EP3098043A1 EP3098043A1 (en) 2016-11-30
EP3098043B1 true EP3098043B1 (en) 2023-06-07

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DE (1) DE102015206941A1 (en)

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KR20210060496A (en) 2018-08-30 2021-05-26 인터페이스 인크. Digital printing for flooring and decorative structures
IT201900017324A1 (en) 2019-09-26 2021-03-26 Cefla Deutschland Gmbh PROCESS TO PREPARE A REINFORCED AND / OR FLAME RETARDED PANEL
IT201900017288A1 (en) 2019-09-26 2021-03-26 Cefla Deutschland Gmbh PROCESS FOR PREPARING WATER-PROOF, REINFORCED AND / OR FLAME RETARDED PANEL EDGES

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Publication number Priority date Publication date Assignee Title
US5916960A (en) * 1993-12-21 1999-06-29 The Sherwin-Williams Company Water-based, storage stable, self-curing coating composition
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
US6596063B2 (en) * 2001-05-18 2003-07-22 Markus Rettenbacher Impregnated wood
DE102008049132A1 (en) * 2008-09-26 2010-04-08 Flooring Technologies Ltd. Method for producing a wood fiber board and wood fiber board manufacturing device
EP2474399B1 (en) * 2011-01-06 2019-02-20 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

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DE102015206941A1 (en) 2016-11-10
EP3098043A1 (en) 2016-11-30

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