EP1806213A1 - Process for impregnation of wood chips - Google Patents

Process for impregnation of wood chips Download PDF

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Publication number
EP1806213A1
EP1806213A1 EP05405724A EP05405724A EP1806213A1 EP 1806213 A1 EP1806213 A1 EP 1806213A1 EP 05405724 A EP05405724 A EP 05405724A EP 05405724 A EP05405724 A EP 05405724A EP 1806213 A1 EP1806213 A1 EP 1806213A1
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EP
European Patent Office
Prior art keywords
wood chips
wood
impregnating
impregnating agents
water
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EP05405724A
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German (de)
French (fr)
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EP1806213B1 (en
Inventor
Jakob Friederich Werz
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Individual
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Individual
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Priority to DE502005003920T priority Critical patent/DE502005003920D1/en
Priority to EP05405724A priority patent/EP1806213B1/en
Priority to AT05405724T priority patent/ATE393689T1/en
Priority to PL05405724T priority patent/PL1806213T3/en
Priority to US11/646,189 priority patent/US20070169901A1/en
Publication of EP1806213A1 publication Critical patent/EP1806213A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • 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
    • B27K1/00—Damping wood
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/10—Temperature; Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
    • 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
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/06—Softening or hardening of wood
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
    • F26B2210/16—Wood, e.g. lumber, timber

Definitions

  • the invention relates to a process for the impregnation of wood chips with dissolved and / or emulsified substances in water as impregnating agent for improving the elastic, mechanical, chemical and / or biological properties by vacuum impregnation and drying with dry steam.
  • Wood chips are used as fillers for a whole range of wood-plastic composites.
  • plastic matrix both thermosets and thermoplastics can be used.
  • the wood particles from sawing, planing or so-called cutting chips are brought by regrinding to the desired size and shape.
  • the thickness of the wood particles is usually in the range of 0.2 - 0.5 mm, the ratio of width to length (slenderness) between 1: 3 and 1:10.
  • the chip material After drying and fractionation, the chip material is present in the desired shape and size.
  • the wood particles in suitable mixers, such as. B. in high-speed rotary mixers, kneading machines, heating-cooling mixers or Mischextrudem, homogeneously mixed with the plastic matrix.
  • the mixture thus produced can be pressed or injected into molds for the production of the actual composite material.
  • the extrusion to bars, profiles and similar semi-finished products is possible.
  • the performance characteristics, the mechanical or elastic Properties and the surface quality can be selectively changed or influenced.
  • further additives such as.
  • color pigments or lubricants or by the combination of different plastics, an attractive surface, grip friendliness and the like optical and haptic properties can be achieved.
  • the disclosed process for impregnating wood is prepared from an impregnating agent containing impregnating oil and water-soluble polymers as a thickener, a dispersion.
  • the dispersion is heated to a temperature between 100 and 130 ° C and introduced into a impregnation vessel with the wood to be impregnated.
  • the impregnating agent is introduced into the wood by means of one or more pressure cycles.
  • the EP-A-1 004 413 describes a process for producing impregnated wood chips for use as insulating or insulating material.
  • the chips are dried at a temperature of 150 ° C to the fire limit of the chip material and then sprayed with an impregnating agent. In this case, a pressure of up to 20 bar act on the chips.
  • the invention has for its object to provide a method of the type mentioned, with which the adverse properties of the filler wood, such as swelling, water absorption, susceptibility to rot by wood-destroying organisms or flammability can be reduced.
  • the wood chips are mixed with the substances dissolved and / or emulsified in water and the mixture is subsequently evacuated to a pressure ⁇ 0.1 MPa and after a period of action of at least 20 seconds with dry steam of 1.5 to 6 bar Overpressure is applied.
  • it is evacuated to a pressure of 0.05 to 0.075 MPa.
  • the exposure time is preferably 30 to 300 seconds.
  • the dry steam preferably has 2 to 4 bar, in particular about 3 bar overpressure.
  • Preferred impregnating agents are emulsions of natural and / or synthetic waxes or resins or solutions of minerals or salts, such.
  • boric acid or borax (sodium borate) containing solutions such as sodium borate
  • the impregnating agents may also contain prepolymers which polymerize only in a further processing step.
  • the inventive method is particularly suitable for impregnating wood chips with a preferred thickness of 0.2 to 0.5 mm and a preferred ratio of width to length of 1: 3 to 1: 10.
  • a particularly preferred field of application of wood chips impregnated with the method according to the invention is their use as filler for wood-plastic composite materials.
  • Wood chips in the form of so-called fine chips having an average length of less than 0.5 mm were introduced into an autoclave together with an aqueous paraffin emulsion.
  • the wood chips and the paraffin emulsion were mixed by intensive stirring.
  • the container was evacuated to a pressure of 0.07 MPa.
  • the container was charged with dry steam of 3 bar.
  • the spangle was dried while stirring and the paraffin was fixed on the chips.
  • the water absorption capacity of the wood chips could be reduced by 60%.
  • Gate sawdust was introduced into the autoclave together with an aqueous boric acid solution and treated in the same manner as in Example 1.
  • the chips thus treated were inoculated on a substrate with spores of wood-destroying fungi and stored in the damp-warm climate. Through this treatment, the wood chips were protected from fungal attack.
  • the inventive method can be compared to the conventional production of wood chips achieve numerous advantages.
  • any presence of moisture in the wood chips and / or aggregates is troublesome.
  • An addition of aggregates as a solution together with a glue - as is customary in water-soluble thermosetting synthetic resins - is therefore not possible.
  • An admixture as a powder or in other solid form is usually not possible or only to a limited extent because of the different specific weights of the components.
  • segregation then threatens during further processing.
  • An impregnation of the wood before cutting would be very expensive and the loading of the wood substance not sufficiently uniform with the additive or additives, the impregnation at ambient pressure by means of water-dissolved substances and subsequent drying by contact heat and / or convection conceivable in principle, but technologically and technically complex and expensive.
  • the impregnation of the wood chips is carried out with the method according to the invention and, depending on the quality requirement, further substances are added to improve various properties of the wood chips. Furthermore, to improve the properties of the wood chips according to the invention can be provided to mix the wood chips binders and / or emulsions of natural and / or synthetic waxes or resins and / or solutions of minerals or salts and / or prepolymers and / or fungicides.

Landscapes

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

Abstract

The method involves providing substances dissolved or emulsified in water as an impregnating agent for influencing the elastic, mechanical, chemical and/or biological characteristics by vacuum impregnation and drying with dry vapors. The impregnating agent is a solution of minerals or salts, where the agent contains borax. The wood chips are mixed with the substances dissolved in the water, where the mixtures evacuate at a predetermined pressure.

Description

Die Erfindung betrifft ein Verfahren zur Imprägnierung von Holzspänen mit in Wasser gelösten und/oder emulgierten Substanzen als Imprägniermittel zur Verbesserung der elastischen, mechanischen, chemischen und/oder biologischen Eigenschaften durch Vakuumimprägnieren und Trocknen mit Trockendampf.The invention relates to a process for the impregnation of wood chips with dissolved and / or emulsified substances in water as impregnating agent for improving the elastic, mechanical, chemical and / or biological properties by vacuum impregnation and drying with dry steam.

Holzspäne werden als Füllstoff für eine ganze Reihe von Holz-Kunststoff- Verbundwerkstoffen eingesetzt. Als Kunststoffmatrix können sowohl Duroplaste als auch Thermoplaste verwendet werden sein. Die Holzpartikel aus Säge-, Hobel- oder sogenannten Schneidspänen werden durch Nachmahlen auf die gewünschte Grösse und Form gebracht. Die Dicke der Holzpartikel liegt üblicherweise im Bereich von 0,2 - 0,5 mm, das Verhältnis von Breite zu Länge (Schlankheitsgrad) zwischen 1 : 3 und 1:10.Wood chips are used as fillers for a whole range of wood-plastic composites. As plastic matrix both thermosets and thermoplastics can be used. The wood particles from sawing, planing or so-called cutting chips are brought by regrinding to the desired size and shape. The thickness of the wood particles is usually in the range of 0.2 - 0.5 mm, the ratio of width to length (slenderness) between 1: 3 and 1:10.

Nach Trocknung und Fraktionierung liegt das Spanmaterial in der gewünschten Form und Grösse vor.After drying and fractionation, the chip material is present in the desired shape and size.

Zur Herstellung des Holz-Kunststoff-Gemenges oder -Gemisches werden die Holzpartikel in geeigneten Mischern, wie z. B. in schnell laufenden Rotationsmischern, Knetmaschinen, Heiz-Kühlmischern oder Mischextrudem, mit der Kunststoffmatrix homogen vermengt.To produce the wood-plastic mixture or mixture, the wood particles in suitable mixers, such as. B. in high-speed rotary mixers, kneading machines, heating-cooling mixers or Mischextrudem, homogeneously mixed with the plastic matrix.

Das so erzeugte Gemenge kann zur Herstellung des eigentlichen Verbundwerkstoffes in Formen gepresst oder gespritzt werden. Auch die Extrusion zu Stangen, Profilen und ähnlichen Halbzeugen ist möglich.The mixture thus produced can be pressed or injected into molds for the production of the actual composite material. The extrusion to bars, profiles and similar semi-finished products is possible.

Durch Veränderung des Holz- bzw. des Kunststoffanteils am Holz-KunststoffVerbund können die Gebrauchseigenschaften, die mechanischen oder elastischen Eigenschaften und die Oberflächenqualität gezielt verändert bzw. beeinflusst werden. Durch Zugabe weiterer Additive, wie z. B. Farbpigmente oder Gleitmittel, oder durch die Kombination verschiedener Kunststoffe können eine ansprechende Oberfläche, Grifffreundlichkeit und dergleichen optische und haptische Eigenschaften erzielt werden.By changing the wood or the plastic content of the wood-plastic composite, the performance characteristics, the mechanical or elastic Properties and the surface quality can be selectively changed or influenced. By adding further additives, such as. As color pigments or lubricants, or by the combination of different plastics, an attractive surface, grip friendliness and the like optical and haptic properties can be achieved.

Weiterhin ist es möglich durch geeignete Auswahl der verwendeten Hölzer und die gezielte Beeinflussung der Holzeigenschaften eine Verbesserung der Qualität und der Gebrauchseigenschaften des Verbundwerkstoffes zu erreichen.Furthermore, it is possible to achieve an improvement in the quality and the service properties of the composite material by suitable selection of the woods used and the targeted influencing of the wood properties.

Aus der DE-A-195 21 623 ist es bei einem Verfahren zum Imprägnieren von Holz mit Saccharose-Lösung bekannt, die Holzteile in einem Behälter zunächst mit Trockendampf zu behandeln und anschliessend durch einen autogen erzeugten Vakuumeffekt zu imprägnieren.From the DE-A-195 21 623 In a process for impregnating wood with sucrose solution, it is known to first treat the wood parts in a container with dry steam and then to impregnate them by an autogenously generated vacuum effect.

Bei einem in der EP-B-1 216 801 offenbarten Verfahren zur Imprägnierung von Holz wird aus einem Imprägniermittel, das Imprägnieröl und wasserlösliche Polymere als Verdickungsmittel enthält, eine Dispersion hergestellt. Die Dispersion wird auf eine Temperatur zwischen 100 und 130 °C aufgeheizt und in einen Tränkkessel mit dem zu imprägnierenden Holz eingeleitet. Das Imprägniermittel wird mittels eines oder mehrerer Druckzyklen in das Holz eingebracht.At one in the EP-B-1 216 801 The disclosed process for impregnating wood is prepared from an impregnating agent containing impregnating oil and water-soluble polymers as a thickener, a dispersion. The dispersion is heated to a temperature between 100 and 130 ° C and introduced into a impregnation vessel with the wood to be impregnated. The impregnating agent is introduced into the wood by means of one or more pressure cycles.

Die EP-A-1 004 413 beschreibt ein Verfahren zur Herstellung von imprägnierten Holzspänen zur Verwendung als Dämm- oder Isolierstoff. Die Späne werden bei einer Temperatur von 150 °C bis zur Brandgrenze des Spanmaterials getrocknet und anschliessend mit einem Imprägniermittel besprüht. Dabei kann ein Druck von bis zu 20 bar auf die Späne einwirken.The EP-A-1 004 413 describes a process for producing impregnated wood chips for use as insulating or insulating material. The chips are dried at a temperature of 150 ° C to the fire limit of the chip material and then sprayed with an impregnating agent. In this case, a pressure of up to 20 bar act on the chips.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art zu schaffen, mit dem die die nachteiligen Eigenschaften des Füllstoffes Holz, wie zum Beispiel Quellbarkeit, Wasseraufnahmevermögen, Anfälligkeit gegen Fäulnis durch holzzerstörende Organismen oder Brennbarkeit vermindert werden können.The invention has for its object to provide a method of the type mentioned, with which the adverse properties of the filler wood, such as swelling, water absorption, susceptibility to rot by wood-destroying organisms or flammability can be reduced.

Zur erfindungsgemässen Lösung der Aufgabe führt, dass die Holzspäne mit den in Wasser gelösten und/oder emulgierten Substanzen vermischt werden und die Mischung anschliessend auf einen Druck < 0,1 MPa evakuiert und nach einer Einwirkungsdauer von wenigstens 20 Sekunden mit Trockendampf von 1.5 bis 6 bar Überdruck beaufschlagt wird.To solve this problem according to the invention, the wood chips are mixed with the substances dissolved and / or emulsified in water and the mixture is subsequently evacuated to a pressure <0.1 MPa and after a period of action of at least 20 seconds with dry steam of 1.5 to 6 bar Overpressure is applied.

Bevorzugt wird auf einen Druck von 0,05 bis 0,075 MPa evakuiert.Preferably, it is evacuated to a pressure of 0.05 to 0.075 MPa.

Die Einwirkungsdauer beträgt bevorzugt 30 bis 300 Sekunden.The exposure time is preferably 30 to 300 seconds.

Der Trockendampf weist bevorzugt 2 bis 4 bar, insbesondere etwa 3 bar Überdruck auf.The dry steam preferably has 2 to 4 bar, in particular about 3 bar overpressure.

Bevorzugte Imprägniermittel sind Emulsionen von natürlichen und/oder synthetischen Wachsen oder Harzen oder Lösungen von Mineralien oder Salzen, wie z. B. Borsäure oder Borax (Natriumborat) enthaltende LösungenPreferred impregnating agents are emulsions of natural and / or synthetic waxes or resins or solutions of minerals or salts, such. As boric acid or borax (sodium borate) containing solutions

Die Imprägniermittel können auch Prepolymere enthalten, die erst in einem weiteren Verarbeitungsschritt auspolymerisieren.The impregnating agents may also contain prepolymers which polymerize only in a further processing step.

Das erfindungsgemässe Verfahren eignet sich in besonderem Mass zur Imprägnierung von Holzspänen mit einer bevorzugten Dicke von 0,2 bis 0,5 mm und einem bevorzugten Verhältnis von Breite zu Länge von 1 : 3 bis 1: 10.The inventive method is particularly suitable for impregnating wood chips with a preferred thickness of 0.2 to 0.5 mm and a preferred ratio of width to length of 1: 3 to 1: 10.

Ein besonders bevorzugter Anwendungsbereich von mit dem erfindungsgemässen Verfahren imprägnierten Holzspänen liegt in deren Verwendung als Füllstoff für Holz-Kunststoff-Verbundwerkstoffe.A particularly preferred field of application of wood chips impregnated with the method according to the invention is their use as filler for wood-plastic composite materials.

Die Erfindung wird nachfolgend anhand zweier Beispiele näher erläutert.The invention will be explained in more detail with reference to two examples.

Beispiel 1example 1

Holzspäne in der Form so genannter Feinspäne einer mittleren Länge von weniger als 0,5 mm wurden zusammen mit einer wässrigen Paraffinemulsion in einen Autoklaven eingebracht. Dabei wurden die Holzspäne und die Paraffinemulsion durch intensives Rühren vermischt. Anschliessend wurde der Behälter auf einen Druck von 0,07 MPa evakuiert. Nach einer Einwirkungszeit von 200 Sekunden wurde der Behälter mit trockenem Dampf von 3 bar beaufschlagt. Dabei wurde das Spangut unter Rühren getrocknet und das Paraffin auf den Spänen fixiert. Die Wasseraufnahmefähigkeit der Holzspäne konnte um 60% reduziert werden.Wood chips in the form of so-called fine chips having an average length of less than 0.5 mm were introduced into an autoclave together with an aqueous paraffin emulsion. The wood chips and the paraffin emulsion were mixed by intensive stirring. Subsequently, the container was evacuated to a pressure of 0.07 MPa. After an exposure time of 200 seconds, the container was charged with dry steam of 3 bar. The spangle was dried while stirring and the paraffin was fixed on the chips. The water absorption capacity of the wood chips could be reduced by 60%.

Beispiel 2Example 2

Gattersägespäne wurden zusammen mit einer wässrigen Borsäurelösung in den Autoklaven eingebracht und in gleicher Weise wie in Beispiel 1 behandelt. Die so behandelten Späne wurden auf einem Substrat mit Sporen holzzerstörender Pilze geimpft und im Feuchtwarm-Klima gelagert. Durch diese Behandlung wurden die Holzspäne vor Pilzbefall geschützt.Gate sawdust was introduced into the autoclave together with an aqueous boric acid solution and treated in the same manner as in Example 1. The chips thus treated were inoculated on a substrate with spores of wood-destroying fungi and stored in the damp-warm climate. Through this treatment, the wood chips were protected from fungal attack.

Mit dem erfindungsgemässen Verfahren lassen sich gegenüber der herkömmlichen Herstellung von Holzspänen zahlreiche Vorteile erzielen.The inventive method can be compared to the conventional production of wood chips achieve numerous advantages.

Insbesondere bei der Verwendung von thermoplastischen Kunststoffen ist jegliche Gegenwart von Feuchtigkeit in den Holzspänen und/oder den Zuschlagstoffen störend. Eine Zugabe von Zuschlagstoffen als Lösung zusammen mit einem Leim -- wie es bei wasserlöslichen duroplastischen Kunstharzen üblich ist -- ist demzufolge nicht möglich. Eine Zumischung als Pulver oder in anderer fester Form ist in der Regel wegen der unterschiedlichen spezifischen Gewichte der Komponenten nicht oder nur eingeschränkt möglich. Ausserdem droht dann bei der Weiterverarbeitung wiederum Entmischung. Eine Imprägnierung des Holzes vor der Zerspanung wäre sehr aufwendig und die Beladung der Holzsubstanz mit dem oder den Zuschlagstoffen nicht ausreichend gleichmässig, die Imprägnierung bei Umgebungsdruck mittels wassergelösten Substanzen und anschliessende Trocknung durch Kontaktwärme und/oder Konvektion grundsätzlich denkbar, jedoch technologisch und technisch aufwendig und teuer.Especially with the use of thermoplastics, any presence of moisture in the wood chips and / or aggregates is troublesome. An addition of aggregates as a solution together with a glue - as is customary in water-soluble thermosetting synthetic resins - is therefore not possible. An admixture as a powder or in other solid form is usually not possible or only to a limited extent because of the different specific weights of the components. In addition, segregation then threatens during further processing. An impregnation of the wood before cutting would be very expensive and the loading of the wood substance not sufficiently uniform with the additive or additives, the impregnation at ambient pressure by means of water-dissolved substances and subsequent drying by contact heat and / or convection conceivable in principle, but technologically and technically complex and expensive.

In Ausgestaltung der Erfindung ist vorgesehen, dass die Imprägnierung der Holzspäne mit dem erfindungsgemässen Verfahren durchgeführt wird und je nach Qualitätsanforderung weitere Substanzen zur Verbesserung verschiedener Eigenschaften der Holzspäne beigemischt werden. Weiterhin kann zur Verbesserung der Eigenschaften der Holzspäne erfindungsgemäss vorgesehen sein, den Holzspänen Bindemittel und/oder Emulsionen von natürlichen und/oder synthetischen Wachsen oder Harzen und/oder Lösungen von Mineralien oder Salzen und/oder Prepolymere und/oder Fungizide beizumischen.In an embodiment of the invention, it is provided that the impregnation of the wood chips is carried out with the method according to the invention and, depending on the quality requirement, further substances are added to improve various properties of the wood chips. Furthermore, to improve the properties of the wood chips according to the invention can be provided to mix the wood chips binders and / or emulsions of natural and / or synthetic waxes or resins and / or solutions of minerals or salts and / or prepolymers and / or fungicides.

Claims (10)

Verfahren zur Imprägnierung von Holzspänen mit in Wasser gelösten und/oder emulgierten Substanzen als Imprägniermittel zur Verbesserung der elastischen, mechanischen, chemischen und/oder biologischen Eigenschaften durch Vakuumimprägnieren und Trocknen mit Trockendampf,
dadurch gekennzeichnet, dass
die Holzspäne mit den in Wasser gelösten und/oder emulgierten Substanzen vermischt werden und die Mischung anschliessend auf einen Druck < 0,1 MPa evakuiert und nach einer Einwirkungsdauer von wenigstens 20 Sekunden mit Trockendampf von 1.5 bis 6 bar Überdruck beaufschlagt wird.Process for impregnating wood chips with substances dissolved and / or emulsified in water as impregnating agents for improving the elastic, mechanical, chemical and / or biological properties by vacuum impregnation and drying with dry steam,
characterized in that
the wood chips are mixed with the substances dissolved and / or emulsified in water and the mixture is then evacuated to a pressure <0.1 MPa and after a period of action of at least 20 seconds with dry steam of 1.5 to 6 bar pressure is applied. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass auf einen Druck von 0,05 bis 0,075 MPa evakuiert wird.A method according to claim 1, characterized in that is evacuated to a pressure of 0.05 to 0.075 MPa. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Einwirkungsdauer 30 bis 300 Sekunden beträgt.A method according to claim 1 or 2, characterized in that the exposure time is 30 to 300 seconds. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Trockendampf 2 bis 4 bar Überdruck, insbesondere etwa 3 bar Überdruck, aufweist.Method according to one of claims 1 to 3, characterized in that the dry steam 2 to 4 bar pressure, in particular about 3 bar overpressure. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Holzspäne eine Dicke von 0,2 bis 0,5 mm und ein Verhältnis von Breite zu Länge von 1 : 3 bis 1: 10 aufweisen.Method according to one of claims 1 to 4, characterized in that the wood chips have a thickness of 0.2 to 0.5 mm and a ratio of width to length of 1: 3 to 1: 10. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Imprägniermittel Emulsionen von natürlichen und/oder synthetischen Wachsen oder Harzen sind.Method according to one of claims 1 to 5, characterized in that the impregnating agents are emulsions of natural and / or synthetic waxes or resins. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Imprägniermittel Lösungen von Mineralien oder Salzen sind.Method according to one of claims 1 to 6, characterized in that the impregnating agents are solutions of minerals or salts. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die Imprägniermittel Borsäure oder Borax enthalten.Process according to claim 7, characterized in that the impregnating agents contain boric acid or borax. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Imprägniermittel Prepolymere enthalten.Method according to one of claims 1 to 6, characterized in that the impregnating agents contain prepolymers. Verwendung von mit dem Verfahren nach einem der Ansprüche 1 bis 9 imprägnierten Holzspänen als Füllstoff für Holz-Kunststoff-Verbundwerkstoffe.Use of wood chips impregnated with the method according to any one of claims 1 to 9 as a filler for wood-plastic composite materials.
EP05405724A 2005-12-27 2005-12-27 Process for impregnation of wood chips Active EP1806213B1 (en)

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DE502005003920T DE502005003920D1 (en) 2005-12-27 2005-12-27 Process for impregnating wood chips
EP05405724A EP1806213B1 (en) 2005-12-27 2005-12-27 Process for impregnation of wood chips
AT05405724T ATE393689T1 (en) 2005-12-27 2005-12-27 METHOD FOR IMPREGNATION OF WOOD CHIPS
PL05405724T PL1806213T3 (en) 2005-12-27 2005-12-27 Process for impregnation of wood chips
US11/646,189 US20070169901A1 (en) 2005-12-27 2006-12-27 Process for impregnating woodchips

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EP05405724A EP1806213B1 (en) 2005-12-27 2005-12-27 Process for impregnation of wood chips

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Publication number Priority date Publication date Assignee Title
CN103786200A (en) * 2014-01-16 2014-05-14 中国科学院高能物理研究所 Method for modifying wood by utilizing electron accelerator irradiation and pressurization technology
EP2786662A1 (en) * 2013-04-03 2014-10-08 RUDOLF WILD GmbH & CO. KG Method for depositing substances into organic solids

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Publication number Priority date Publication date Assignee Title
FI127330B (en) 2009-01-30 2018-03-29 Upm Kymmene Corp A method for adding a coupling agent to a raw material

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DE2227652A1 (en) * 1972-06-07 1973-12-20 Keller & Co Ag Klingnau Impregnating cellular materials - esp wood, with opt polymerisable resin precondensate in low-boiling solvent
DE19521623A1 (en) 1995-06-14 1996-03-07 Edwin Schmidt Impregnating wood with saccharose soln.
EP1004413A1 (en) 1998-11-19 2000-05-31 Hubert Fritz Process and installation for producing impregnated wood shavings
WO2003000475A1 (en) * 2001-05-09 2003-01-03 Fletcher Building Products Limited High performance composite material production
EP1216801B1 (en) 2000-12-21 2005-06-08 Dipl.-Ing. Marmetschke Michael Process for impregnating wood

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DE2227652A1 (en) * 1972-06-07 1973-12-20 Keller & Co Ag Klingnau Impregnating cellular materials - esp wood, with opt polymerisable resin precondensate in low-boiling solvent
DE19521623A1 (en) 1995-06-14 1996-03-07 Edwin Schmidt Impregnating wood with saccharose soln.
EP1004413A1 (en) 1998-11-19 2000-05-31 Hubert Fritz Process and installation for producing impregnated wood shavings
EP1216801B1 (en) 2000-12-21 2005-06-08 Dipl.-Ing. Marmetschke Michael Process for impregnating wood
WO2003000475A1 (en) * 2001-05-09 2003-01-03 Fletcher Building Products Limited High performance composite material production

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2786662A1 (en) * 2013-04-03 2014-10-08 RUDOLF WILD GmbH & CO. KG Method for depositing substances into organic solids
WO2014161648A1 (en) * 2013-04-03 2014-10-09 Rudolf Wild Gmbh & Co. Kg Method for storing substances in organic solids
CN103786200A (en) * 2014-01-16 2014-05-14 中国科学院高能物理研究所 Method for modifying wood by utilizing electron accelerator irradiation and pressurization technology

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ATE393689T1 (en) 2008-05-15
PL1806213T3 (en) 2008-09-30
EP1806213B1 (en) 2008-04-30
DE502005003920D1 (en) 2008-06-12
US20070169901A1 (en) 2007-07-26

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