WO2012136215A1 - Method for treating wooden materials with high-frequency electromagnetic waves - Google Patents

Method for treating wooden materials with high-frequency electromagnetic waves Download PDF

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Publication number
WO2012136215A1
WO2012136215A1 PCT/DK2012/050099 DK2012050099W WO2012136215A1 WO 2012136215 A1 WO2012136215 A1 WO 2012136215A1 DK 2012050099 W DK2012050099 W DK 2012050099W WO 2012136215 A1 WO2012136215 A1 WO 2012136215A1
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WO
WIPO (PCT)
Prior art keywords
wooden material
wooden
electromagnetic waves
impregnating
frequency electromagnetic
Prior art date
Application number
PCT/DK2012/050099
Other languages
French (fr)
Inventor
John Asmussen
Original Assignee
Miawood
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Miawood filed Critical Miawood
Publication of WO2012136215A1 publication Critical patent/WO2012136215A1/en

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Classifications

    • 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
    • B27K5/003—Treating of wood not provided for in groups B27K1/00, B27K3/00 by using electromagnetic radiation or mechanical waves
    • B27K5/0055—Radio-waves, e.g. microwaves
    • 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
    • B27K3/0207—Pretreatment of wood before impregnation
    • B27K3/0221—Pore opening
    • 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
    • B27K3/15—Impregnating involving polymerisation including use of polymer-containing impregnating agents
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L97/00—Compositions of lignin-containing materials
    • C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
    • 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
    • B27K2240/00—Purpose of the treatment
    • B27K2240/30—Fireproofing
    • 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
    • B27K5/02—Staining or dyeing wood; Bleaching wood
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/02—Polysilicates

Definitions

  • the present invention relates to a method for treating wooden material, particularly to methods for impregnation of wooden materials, for instance for protecting the materials against fire, insects, mould, rot or fungi or for dyeing the material.
  • impregnation of wooden materials is performed by means of methods including the use of vacuum, pressure or vacuum-pressure systems or the like. These methods typically suffer from the problem that the impregnation solutions only penetrate the material to be impregnated to a certain depth, often only a few centimetres from the surface of the material.
  • the impregnation depth is even smaller, in some cases almost non-existing.
  • the present invention relates to a method for treating a wooden material with high- frequency electromagnetic waves, said method comprising the step of heating the wooden material by exposing it to high-frequency electromagnetic waves. Heating the wooden material by means of high-frequency electromagnetic waves increases the susceptibility of the material for liquids, such as different types of impregnation solutions and enables for a complete penetration of the material of such liquids.
  • the method makes it possible to impregnate the wooden material all the way through, even if it consists of heartwood of any species of wood, and not only to a certain limited penetration depth from the surface as is often the case when using methods known in the art.
  • spruce which is almost non-impregnable with conventional methods, may be penetrated by the impregnation solution.
  • wooden materials can be obtained, which are much more resistive to fire, algae, insects, mould, rot or fungi, and that it becomes possible to dye the material in any desired colour all the way through.
  • the wooden material is heated to a temperature of between 50 °C and 220 °C, depending on the species of the wood.
  • the wooden material is heated using electromagnetic waves of a frequency between 10 MHz and 30 MHz, preferably 13.56 MHz.
  • a frequency of 13.56 MHz is preferred.
  • the method further comprises the step of impregnating the wooden material with an impregnation solution.
  • the wooden material is impregnated using a vacuum system, a pressure system or a vacuum-pressure system.
  • the material When the wooden material has been heated using high-frequency electromagnetic waves, the material may be impregnated using well-known vacuum, pressure and vacuum-pressure systems.
  • the heating with electromagnetic waves means that deeper penetration and shorter impregnation times may be obtained without performing any changes to the impregnation systems.
  • the wooden material is kept at a substantially constant temperature between the step of heating the material and the step of impregnating the material.
  • the wooden material is kept at a substantially constant temperature from the step of heating the material and throughout the step of impregnating the material.
  • the impregnation solution used for impregnating the wooden material is water glass.
  • a dyeing colour is blended into the water glass.
  • the impregnation solution used for impregnating the wooden material is a fire retardant, such as Burnblock ® or FT ® Anti Burn.
  • fire retardant When the wooden material is impregnated with a suitable fire retardant, it cannot burn and it complies with even the toughest requirements for fire protection and enables for building multi-storey buildings from wood. Many fire retardants, such as Burnblock ® or FT ® Anti Burn, are very environmentally sound materials.
  • the impregnation solution used for impregnating the wooden material is a disinfectant, which is effective against algae, insects, mould, rot or fungi, such as Boracol ® .
  • a dyeing colour is blended into the disinfectant.
  • a suitable disinfectant it cannot burn and it complies with even the toughest requirements for fire protection. Furthermore, the wooden material is protected against rot, fungi, termites and other insects, etc. The lifetime of the wooden material is significantly prolonged and almost no maintenance is needed. Many disinfectants, such as Boracol ® , are very environmentally sound materials.
  • it relates to a wooden material, which has been impregnated with water glass using the method as described above.
  • a wooden material which has been impregnated with a fire retardant, such as Burnblock ® or FT ® Anti Burn, using the method as described above.
  • a wooden material which has been impregnated with a disinfectant, which is effective against algae, insects, mould, rot or fungi, such as Boracol ® , using the method as described above.
  • fig. 1 illustrates schematically a side view of an embodiment of a high- frequency electromagnetic heating device, which may be used for carrying out the method according to the invention
  • fig. 2 illustrates schematically an end view of an embodiment of a high- frequency electromagnetic heating device, which may be used for carrying out the method according to the invention
  • fig. 3a illustrates schematically an example of impregnation solution penetration obtained by using methods known in the art
  • fig. 3b illustrates schematically the impregnation solution penetration, which may be obtained by using the methods according to the invention.
  • Figs. 1 and 2 illustrate schematically a side view and an end view, respectively, of an embodiment of a high-frequency electromagnetic heating device 1, which may be used for carrying out the method according to the invention.
  • the wooden material 2 to be heated enters the heating device 1 on a conveyor comprising a first electrode and forming a fixed plane 4 onto which the wooden material 2 rests.
  • a movable plane 3 comprising a second electrode is lowered until it is in contact with the upper surface of the wooden material 2.
  • High-frequency electromagnetic waves are applied between the two electrodes, i.e. through the wooden material 2, by means of a high-frequency generator 6, resulting in the wooden material 2 being heated by the energy of the electromagnetic waves.
  • the temperature to which the wooden material 2 is to be heated and the time needed for heating the wooden material 2 depend on the species of the wood and of the desired quality of the wooden material 2 after the heating.
  • the movable plane 3 is lifted from the wooden material 2, which leaves the heating device 1 on the conveyor.
  • the wooden material 2 moves into a heated chamber keeping it substantially at the temperature to which it was heated in the heating device 1.
  • the heating device 1 may be used before any conventional system for impregnation of wooden materials, improving the efficiency with respect to penetration depth and time consumption of such a system.
  • heating devices 1 of many variations may be used, varying in size and dimensions as well as in complexity and level of automation.
  • the impregnation of the wooden material 2 may, for instance, be done in a vacuum- pressure system, in which the air is removed from the wooden material 2 by means of vacuum before the impregnation solution is added and pressure is applied in order to facilitate the penetration of the impregnation solution into the wooden material 2.
  • the application of either the vacuum or the pressure may be omitted.
  • the time needed for the impregnation process depends very much on the species of wood and on the type of impregnation solution used.
  • Fig. 3b illustrates schematically how the impregnation solution (represented by the circles) is able to penetrate the wooden material 2 completely when the method according to the present invention is used, whereas, as indicated in fig. 3a, the impregnation solution typically only penetrates the wooden material 2 to a certain limited penetration depth from the surface of the material when more conventional impregnation methods are used.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

A method for treating a wooden material with high-frequency electromagnetic waves is disclosed, said method comprising the step of heating the wooden material by exposing it to high-frequency electromagnetic waves. Preferably, the method further comprises the step of impregnating the wooden material with an impregnation solution, such as water glass, a fire retardant or a disinfectant. Furthermore, wooden materials impregnated using this method are disclosed.

Description

METHOD FOR TREATING WOODEN MATERIALS
WITH HIGH-FREQUENCY ELECTROMAGNETIC WAVES
Field of the invention
The present invention relates to a method for treating wooden material, particularly to methods for impregnation of wooden materials, for instance for protecting the materials against fire, insects, mould, rot or fungi or for dyeing the material.
Background of the invention
Traditionally, impregnation of wooden materials is performed by means of methods including the use of vacuum, pressure or vacuum-pressure systems or the like. These methods typically suffer from the problem that the impregnation solutions only penetrate the material to be impregnated to a certain depth, often only a few centimetres from the surface of the material.
For some wooden materials, such as for instance spruce, the impregnation depth is even smaller, in some cases almost non-existing.
Brief description of the invention
It is an object of the present invention to provide an improved method, which enables the impregnation solutions to completely penetrate the material to be impregnated, and which reduces the time needed for impregnating the material still using the well- known vacuum, pressure and vacuum-pressure systems.
The present invention relates to a method for treating a wooden material with high- frequency electromagnetic waves, said method comprising the step of heating the wooden material by exposing it to high-frequency electromagnetic waves. Heating the wooden material by means of high-frequency electromagnetic waves increases the susceptibility of the material for liquids, such as different types of impregnation solutions and enables for a complete penetration of the material of such liquids.
This means that the method makes it possible to impregnate the wooden material all the way through, even if it consists of heartwood of any species of wood, and not only to a certain limited penetration depth from the surface as is often the case when using methods known in the art. Thus, even spruce, which is almost non-impregnable with conventional methods, may be penetrated by the impregnation solution. The result is that wooden materials can be obtained, which are much more resistive to fire, algae, insects, mould, rot or fungi, and that it becomes possible to dye the material in any desired colour all the way through. In an embodiment of the invention, the wooden material is heated to a temperature of between 50 °C and 220 °C, depending on the species of the wood.
Experiments have shown that the optimum impregnation results are obtained if the wooden material is heated to a temperature within this range.
In an embodiment of the invention, the wooden material is heated using electromagnetic waves of a frequency between 10 MHz and 30 MHz, preferably 13.56 MHz. Experiments have shown that the optimum impregnation results are obtained if the wooden material is heated using electromagnetic waves of a frequency within this range. Due to legal requirements, a frequency of 13.56 MHz is preferred.
In an embodiment of the invention, the method further comprises the step of impregnating the wooden material with an impregnation solution. In a further embodiment of the invention, the wooden material is impregnated using a vacuum system, a pressure system or a vacuum-pressure system.
When the wooden material has been heated using high-frequency electromagnetic waves, the material may be impregnated using well-known vacuum, pressure and vacuum-pressure systems. The heating with electromagnetic waves means that deeper penetration and shorter impregnation times may be obtained without performing any changes to the impregnation systems. In an embodiment of the invention, the wooden material is kept at a substantially constant temperature between the step of heating the material and the step of impregnating the material.
In a further embodiment of the invention, the wooden material is kept at a substantially constant temperature from the step of heating the material and throughout the step of impregnating the material.
Experiments have shown that the optimum impregnation results are obtained if the wooden material is kept at the temperature, to which it is heated, throughout the impregnation process.
In an embodiment of the invention, the impregnation solution used for impregnating the wooden material is water glass. In a further embodiment of the invention, a dyeing colour is blended into the water glass.
When the wooden material is impregnated with water glass, it cannot burn and it complies with even the toughest requirements for fire protection and enables for building multi-storey buildings from wood. The water glass hardens and cannot be washed out or removed from the wooden material in any other way. The lifetime of the wooden material is significantly prolonged and almost no maintenance is needed. Furthermore, the water glass makes the wooden material much stronger and more dimensionally stable, and it is a very environmentally sound material. In an embodiment of the invention, the impregnation solution used for impregnating the wooden material is a fire retardant, such as Burnblock® or FT® Anti Burn.
When the wooden material is impregnated with a suitable fire retardant, it cannot burn and it complies with even the toughest requirements for fire protection and enables for building multi-storey buildings from wood. Many fire retardants, such as Burnblock® or FT® Anti Burn, are very environmentally sound materials.
In an embodiment of the invention, the impregnation solution used for impregnating the wooden material is a disinfectant, which is effective against algae, insects, mould, rot or fungi, such as Boracol®.
In a further embodiment of the invention, a dyeing colour is blended into the disinfectant. When the wooden material is impregnated with a suitable disinfectant, it cannot burn and it complies with even the toughest requirements for fire protection. Furthermore, the wooden material is protected against rot, fungi, termites and other insects, etc. The lifetime of the wooden material is significantly prolonged and almost no maintenance is needed. Many disinfectants, such as Boracol®, are very environmentally sound materials.
In an aspect of the invention, it relates to a wooden material, which has been impregnated with water glass using the method as described above. In an aspect of the invention, it relates to a wooden material, which has been impregnated with a fire retardant, such as Burnblock® or FT® Anti Burn, using the method as described above.
In an aspect of the invention, it relates to a wooden material, which has been impregnated with a disinfectant, which is effective against algae, insects, mould, rot or fungi, such as Boracol®, using the method as described above.
Figures
A few exemplary embodiments of the invention will be described in more detail in the following with reference to the figures, in which fig. 1 illustrates schematically a side view of an embodiment of a high- frequency electromagnetic heating device, which may be used for carrying out the method according to the invention, fig. 2 illustrates schematically an end view of an embodiment of a high- frequency electromagnetic heating device, which may be used for carrying out the method according to the invention, fig. 3a illustrates schematically an example of impregnation solution penetration obtained by using methods known in the art, and fig. 3b illustrates schematically the impregnation solution penetration, which may be obtained by using the methods according to the invention. Detailed description of the invention
Figs. 1 and 2 illustrate schematically a side view and an end view, respectively, of an embodiment of a high-frequency electromagnetic heating device 1, which may be used for carrying out the method according to the invention.
The wooden material 2 to be heated enters the heating device 1 on a conveyor comprising a first electrode and forming a fixed plane 4 onto which the wooden material 2 rests. When the wooden material 2 is in place in the heating device 1, a movable plane 3 comprising a second electrode is lowered until it is in contact with the upper surface of the wooden material 2. High-frequency electromagnetic waves are applied between the two electrodes, i.e. through the wooden material 2, by means of a high-frequency generator 6, resulting in the wooden material 2 being heated by the energy of the electromagnetic waves.
The temperature to which the wooden material 2 is to be heated and the time needed for heating the wooden material 2 depend on the species of the wood and of the desired quality of the wooden material 2 after the heating. When the desired temperature has been reached, the movable plane 3 is lifted from the wooden material 2, which leaves the heating device 1 on the conveyor. Preferably, the wooden material 2 moves into a heated chamber keeping it substantially at the temperature to which it was heated in the heating device 1. The heating device 1 may be used before any conventional system for impregnation of wooden materials, improving the efficiency with respect to penetration depth and time consumption of such a system. Obviously, heating devices 1 of many variations may be used, varying in size and dimensions as well as in complexity and level of automation. The impregnation of the wooden material 2 may, for instance, be done in a vacuum- pressure system, in which the air is removed from the wooden material 2 by means of vacuum before the impregnation solution is added and pressure is applied in order to facilitate the penetration of the impregnation solution into the wooden material 2.
In other simpler systems, the application of either the vacuum or the pressure may be omitted.
In any case, the time needed for the impregnation process depends very much on the species of wood and on the type of impregnation solution used.
Fig. 3b illustrates schematically how the impregnation solution (represented by the circles) is able to penetrate the wooden material 2 completely when the method according to the present invention is used, whereas, as indicated in fig. 3a, the impregnation solution typically only penetrates the wooden material 2 to a certain limited penetration depth from the surface of the material when more conventional impregnation methods are used.
It should be emphasized that the scope of the present invention is not restricted to the description above, which represents a few exemplary and illustrative embodiments only, whereas the scope of the invention is defined by the following claims.
List of reference numbers
1. High-frequency electromagnetic heating device
2. Wooden material to be impregnated
3. Movable plane with electrode
4. Fixed plane with conveyor and electrode
5. Cylinders or actuators for moving the movable plane up and down
6. High-frequency generator

Claims

A method for treating a wooden material (2) with high-frequency electromagnetic waves, said method comprising the step of heating the wooden material by exposing it to high-frequency electromagnetic waves.
The method according to claim 1, wherein the wooden material is heated to a temperature of between 50 °C and 220 °C, depending on the species of the wood.
The method according to claim 1 or 2, wherein the wooden material is heated using electromagnetic waves of a frequency between 10 MHz and 30 MHz, preferably 13.56 MHz.
The method according to any of the preceding claims, further comprising the step of impregnating the wooden material with an impregnation solution.
The method according to claim 4, wherein the wooden material is impregnated using a vacuum system, a pressure system or a vacuum-pressure system.
The method according to claim 4 or 5, wherein the wooden material is kept at a substantially constant temperature between the step of heating the material and the step of impregnating the material.
The method according to claim 6, wherein the wooden material is kept at a substantially constant temperature from the step of heating the material and through-out the step of impregnating the material.
The method according to any of claims 4-7, wherein the impregnation solution
Figure imgf000010_0001
used for impregnating the wooden material is water glass.
9. The method according to claim 8, wherein a dyeing colour is blended into the water glass.
The method according to any of claims 4-7, wherein the impregnation solution used for impregnating the wooden material is a fire retardant, such as Burnblock® or FT® Anti Burn.
The method according to any of claims 4-7, wherein the impregnation solution used for impregnating the wooden material is a disinfectant, which is effective against algae, insects, mould, rot or fungi, such as Boracol®.
12. The method according to claim 11, wherein a dyeing colour is blended into the disinfectant.
A wooden material, which has been impregnated with water glass using method according to claim 8 or 9.
14. A wooden material, which has been impregnated with a fire retardant, such as Burnblock® or FT® Anti Burn, using the method according to claim 10.
15. A wooden material, which has been impregnated with a disinfectant, which is effective against algae, insects, mould, rot or fungi, such as Boracol®, using the method according to claim 11 or 12.
PCT/DK2012/050099 2011-04-06 2012-03-30 Method for treating wooden materials with high-frequency electromagnetic waves WO2012136215A1 (en)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
DKPA201100264 2011-04-06
DKPA201100264 2011-04-06
DKPA201100267 2011-04-07
DKPA201100267 2011-04-07
DKPA201100382 2011-05-18
DKPA201100382 2011-05-18
DKPA201100404 2011-05-27
DKPA201100404 2011-05-27

Publications (1)

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WO2012136215A1 true WO2012136215A1 (en) 2012-10-11

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105904561A (en) * 2016-04-29 2016-08-31 重庆昊色堂建筑设计咨询有限公司 Machining method of special-shaped tenon structure
US10596719B2 (en) 2015-03-05 2020-03-24 Danish Wood Technology A/S Treatment of wood
CN113664933A (en) * 2021-08-20 2021-11-19 葛彩云 Manufacturing method of cloth-grain-imitated recombined decorative veneer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2914432A1 (en) * 1979-04-10 1980-10-16 Peter Ing Grad Dibbern Impregnation of timber e.g. with insecticide or fungicide - by drying in a high frequency field, application of vacuum, treatment with impregnating agent, and application of pressure
DE60012564T2 (en) * 1999-11-22 2005-08-04 Centre de Cooperation International en Recherche Agronomique pour le Développement Method and device for treating wood or similar materials

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2914432A1 (en) * 1979-04-10 1980-10-16 Peter Ing Grad Dibbern Impregnation of timber e.g. with insecticide or fungicide - by drying in a high frequency field, application of vacuum, treatment with impregnating agent, and application of pressure
DE60012564T2 (en) * 1999-11-22 2005-08-04 Centre de Cooperation International en Recherche Agronomique pour le Développement Method and device for treating wood or similar materials

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10596719B2 (en) 2015-03-05 2020-03-24 Danish Wood Technology A/S Treatment of wood
CN105904561A (en) * 2016-04-29 2016-08-31 重庆昊色堂建筑设计咨询有限公司 Machining method of special-shaped tenon structure
CN113664933A (en) * 2021-08-20 2021-11-19 葛彩云 Manufacturing method of cloth-grain-imitated recombined decorative veneer
CN113664933B (en) * 2021-08-20 2023-11-10 葛彩云 Manufacturing method of cloth-like recombined decorative veneer

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