CA2248224A1 - Method for hardening wood - Google Patents
Method for hardening wood Download PDFInfo
- Publication number
- CA2248224A1 CA2248224A1 CA 2248224 CA2248224A CA2248224A1 CA 2248224 A1 CA2248224 A1 CA 2248224A1 CA 2248224 CA2248224 CA 2248224 CA 2248224 A CA2248224 A CA 2248224A CA 2248224 A1 CA2248224 A1 CA 2248224A1
- Authority
- CA
- Canada
- Prior art keywords
- wood
- impregnating
- cylinder
- impregnation
- psi
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
Links
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
- 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
- B27K3/086—Impregnating by pressure, e.g. vacuum impregnation using supercritical or high pressure fluids
-
- 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
- B27K3/10—Apparatus
-
- 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
-
- 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
- B27K3/34—Organic impregnating agents
- B27K3/36—Aliphatic compounds
-
- 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
- B27K3/34—Organic impregnating agents
- B27K3/50—Mixtures of different organic 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Chemical & Material Sciences (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)
Description
METHOD FOR HARDENING WOOD
FIELD OF THE INVENTION
The present invention is concerned with an efficient method for increasing wood hardness of hard-to-treat hardwoods and softwoods without changing the original grain or colour of the wood. The proposed method involves very high pressure impregnation (upwards of 3000 psi) of wood using a new impregnating cylinder mechanism. Thus, the present invention is also concerned with a new impregnation composition and apparatus. The impregnated composition contains monomers and a proposed aliphatic organic acid such as propionic, palmitic or stearic acid to improve upon properties of traditional hardened woods.
The monomer composition is catalysed using conventional means such as heating or gamma-ray irradiation.
BACKGROUND OF THE INVENTION
Wood hardening begins with a high-pressure impregnation of the wood with a mixture of vinyl monomers, catalysts and additives. Following this impregnation, the wood is heated and hot-pressed. This heating causes a dissociation of the catalysts into free-radicals which initiate the polymerisation reaction of the monomers. The end-result is a hardened wood, containing in its pores a polymer which confers to the hardened wood increased resistance to impact, humidity and wood destroying insects and fungus.
US Patent number 5,683,820 (Shannon et al) discloses wood products impregnated with from 30 to 80% of a polymerizable monomer selected from the group consisting of hexanediol diacrylate and hexanediol dimethacrylate having excellent indent resistance. The wood products are impregnated by placing the wood under a vacuum to remove air, contacting the wood with a monomer solution containing a polymerizable hexanediol diacrylate and/or hexanediol dimethacrylate monomer and from 0.5 to about 2 percent of a thermally activated free radical source as a polymerization initiator for a period sufficient to achieve the desired polymer loading. The wood is then heated under pressure to polymerize or cure the monomer.
US Patent number 5,679,407 (Mansikkamaki et al) discloses a method for the hardening of wood material by impregnating it with a polymerizable substance and by polymerizing the polymerizable substance by means of heat. Heat transfer and cleaning in the polymerization have been improved through the impregnated wood material being in contact with water during the polymerization. The water is preferably hot and pressurized and serves at the beginning of the polymerization as a heating medium and during the polymerization as a cooling and cleaning medium.
US Patent number 5,605,767 (Shannon et al) discloses wood products impregnated with from 30 to 80% of a polymerizable monomer selected from the group consisting of hexanediol diacrylate and hexanediol dimethacrylate having excellent indent resistance. The wood products are impregnated by placing the wood under a vacuum to remove air, contacting the wood with a monomer solution containing a polymerizable hexanediol diacrylate and/or hexanediol dimethacrylate monomer and from 0.5 to about 2 percent of a thermally activated free radical source as polymerization initiator for a period sufficient to achieve the desired polymer loading. The wood is then heated under pressure to polymerize or cure the monomers.
US Patent number 4,883,719 (Brebner) discloses a method of surface impregnation of wood articles with a plastic and to the resulting wood articles.
The method uses a diallyl o- phtalate monomer-prepolymer solution and is deemed to improve upon wood properties.
FIELD OF THE INVENTION
The present invention is concerned with an efficient method for increasing wood hardness of hard-to-treat hardwoods and softwoods without changing the original grain or colour of the wood. The proposed method involves very high pressure impregnation (upwards of 3000 psi) of wood using a new impregnating cylinder mechanism. Thus, the present invention is also concerned with a new impregnation composition and apparatus. The impregnated composition contains monomers and a proposed aliphatic organic acid such as propionic, palmitic or stearic acid to improve upon properties of traditional hardened woods.
The monomer composition is catalysed using conventional means such as heating or gamma-ray irradiation.
BACKGROUND OF THE INVENTION
Wood hardening begins with a high-pressure impregnation of the wood with a mixture of vinyl monomers, catalysts and additives. Following this impregnation, the wood is heated and hot-pressed. This heating causes a dissociation of the catalysts into free-radicals which initiate the polymerisation reaction of the monomers. The end-result is a hardened wood, containing in its pores a polymer which confers to the hardened wood increased resistance to impact, humidity and wood destroying insects and fungus.
US Patent number 5,683,820 (Shannon et al) discloses wood products impregnated with from 30 to 80% of a polymerizable monomer selected from the group consisting of hexanediol diacrylate and hexanediol dimethacrylate having excellent indent resistance. The wood products are impregnated by placing the wood under a vacuum to remove air, contacting the wood with a monomer solution containing a polymerizable hexanediol diacrylate and/or hexanediol dimethacrylate monomer and from 0.5 to about 2 percent of a thermally activated free radical source as a polymerization initiator for a period sufficient to achieve the desired polymer loading. The wood is then heated under pressure to polymerize or cure the monomer.
US Patent number 5,679,407 (Mansikkamaki et al) discloses a method for the hardening of wood material by impregnating it with a polymerizable substance and by polymerizing the polymerizable substance by means of heat. Heat transfer and cleaning in the polymerization have been improved through the impregnated wood material being in contact with water during the polymerization. The water is preferably hot and pressurized and serves at the beginning of the polymerization as a heating medium and during the polymerization as a cooling and cleaning medium.
US Patent number 5,605,767 (Shannon et al) discloses wood products impregnated with from 30 to 80% of a polymerizable monomer selected from the group consisting of hexanediol diacrylate and hexanediol dimethacrylate having excellent indent resistance. The wood products are impregnated by placing the wood under a vacuum to remove air, contacting the wood with a monomer solution containing a polymerizable hexanediol diacrylate and/or hexanediol dimethacrylate monomer and from 0.5 to about 2 percent of a thermally activated free radical source as polymerization initiator for a period sufficient to achieve the desired polymer loading. The wood is then heated under pressure to polymerize or cure the monomers.
US Patent number 4,883,719 (Brebner) discloses a method of surface impregnation of wood articles with a plastic and to the resulting wood articles.
The method uses a diallyl o- phtalate monomer-prepolymer solution and is deemed to improve upon wood properties.
US Patent number 4,568,564 (Witty discloses a wear-resistant wood product such as a wood flooring material having a white or bleached appearance which is obtained by impregnating wood with a solution of a polymeric resin whitening agent in a polymerizable monomer such as methylmethacrylate and, after uniform distribution of the monomer solution throughout the wood is obtained, the monomer is polymerized and the whitening agent precipitated in situ in the polymer matrix as a material Having a refractive index sufficiently different from the refractive index of the matrix to impart a bleached or white appearance to said product.
None of the above patents discloses a method for increasing wood hardness of hard-to-treat hardwoods and softwoods without changing the original grain or colour of the wood using high-pressures (higher than 1000 psi) for impregnation, and using an aliphatic organic acid such as propionic, palmitic or stearic acid.
SUMMARY OF THE INVENTION
The object of the present invention is to improve upon traditional wood-polymer composites by producing a hardened wood wherein the original color of the untreated wood is preserved, and wherein the wood is treated uniformly in sapwood and heartwood, and does not warp during the polymerisation of the polymer inside the wood.
In a first aspect, the present invention provides an impregnation composition for maintaining the original color of the untreated wood after treatment. It has been found that low molecular weight monomers having a molecular weight comprised between 300 and 400, such as methyl acrylate or methyl methacrylate, produce less discoloration during polymerisation than high molecular weight monomers such as isodecyl acrylate or styrene. It has also been found that by adding as ari additive to the monomers an aliphatic organic acid having the formula 4 _ CH3-(CH2)n-COOH, n being a number between 1 and 17, such as propionic, palmitic or stearic acid, one may improve greatly the retention of the original color of the wood.
It is important to note that the additives do not contain unsaturated carbon-carbon bonds which would make the end-product more susceptible to UV
discoloration. In fact, the addition of these acids seems to provide some UV-stabilisation effect.
In another aspect, the present invention provides a method for hardening wood, in which the wood is impregnated with an impregnating composition such as one described hereinabove, at a pressure higher than 1000 psi. It has been found that by simply increasing the pressure of impregnation at a pressure higher than 1000 psi and preferably up to 3000 psi while keeping low viscosity formulation, one may achieve a more uniform impregnation .
In a further aspect of the invention, there is provided an apparatus for performing the above-mentioned impregnation method. The apparatus for impregnating wood articles at pressures higher than 1000 psi comprises an impregnating cylinder for receiving a cartridge which embodies an untreated wood, two hydraulic cylinders on which the impregnating cylinder is mounted on a pair of hydraulic cylinders for sealing the impregnating cylinder and pumping a hydraulic fluid into the impregnating cylinder.
Hence it is made possible to do very high pressure impregnations (3000 psi) on an industrial scale by using a cylinder mechanism in which the doors can be rapidly opened and the interior of the impregnating cylinder easily accessed.
-BRIEF DESCRIPTION OF THE DRAWINGS
Fig.1 is a side view of a preferred embodiment of an impregnation apparatus 5 according to the invention;
Fig.2 is a side view of the impregnation apparatus in a ready-to-be-closed position.
Fig. 3 is a side view of the impregnation apparatus in a closed position, where the doors are sealed.
Fig. 4 is a top view of the impregnation apparatus.
DETAILED DESCRIPTION OF THE INVENTION
As mentioned hereinabove, the impregnation composition according to the invention comprises low molecular weight monomers. These monomers have a molecular weight varying between 300 and 400. The monomers intended for use in the impregnation composition are selected from the group comprising:
acrylamide, 4-hydroxybutyl acrylate, butyl acrylate, ethyl acrylate, isodecyl acrylate, lauryl acrylate, octadecyl acrylate, stearyl acrylate, acrylonitrile, divinyl benzene, ethylene glycol dimethacrylate, furfuryl alcohol, methacrylamide, allyl methacrylate, butyl methacrylate, ethyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, isodecyl methacrylate, lauryl methacrylate, methyl methacrylate and chlorure de vinylidene. The composition may preferably comprise an aliphatic organic acid having the general formula of CH3-(CHZ)n-COOH, n being a number between 1 and 17.
' CA 02248224 1998-10-08 A typical formulation used to produce original-color hardened wood could be:
MMA lmethyl methacrylate) 5%
VAZO-52 0.5 S Palmitic acid 10%
where VAZO-52 is pentanenitrile 2,4-dimethyl 2,2 azobis.
The impregnation method for hardening wood in which the wood is impregnated with an impregnating composition at pressures higher than 1000 psi comprises essentially the steps of:
-loading an impregnating cylinder with a cartridge containing an untreated wood;
-pumping hydraulic fluid under pressure into the hydraulic cylinder;
-impregnating the wood under pressure for approximately 5 minutes at ambiant temperature; and -releasing the pressure and removing the impregnating mixture.
More precisely, the method comprises:
STEP I IcLding As can be seen in Fig. 1, small hydraulic cylinders (7) hold the impregnation cylinder (3) up while the wood cartridge (1 1 ) is put inside. The impregnating cylinder (3) is located at the level of the conveyors (13), above the hydraulic cylinders 15) and a cartridge (11 containing the wood to be impregnated is loaded into the impregnating cylinder (3).
Once the wood is inside the cylinder, the impregnating cylinder is lowered and aligned with its doors (9) and hydraulic cylinders (5).
STEP 2 imn~egmation/r~ressurization Once the impregnating cylinder (3) is lowered, hydraulic fluid is pumped under pressure into the hydraulic cylinders (5) using the pistons to move and the doors to seal the cylinder. Since typical hydraulic pressures are upwards of 3000 psi, it is now possible to increase the pressure inside the impregnation cylinder (3) to very high pressures. If the pressure remains steady for a significant period of time, such as 1 to 10 minutes, it means that the impregnation reached all the zones of the wood, and that the impregnation step is finished.
STEP 3 unloading_ Once the impregnation at high pressure is finished, the pressure inside the impregnation cylinder (3) is released, excess impregnation solution and pressure inside the hydraulic cylinders (5) are removed, the doors are pulled (9), the impregnating cylinder (3) is lifted and the wood cartridge (11 ) is removed.
None of the above patents discloses a method for increasing wood hardness of hard-to-treat hardwoods and softwoods without changing the original grain or colour of the wood using high-pressures (higher than 1000 psi) for impregnation, and using an aliphatic organic acid such as propionic, palmitic or stearic acid.
SUMMARY OF THE INVENTION
The object of the present invention is to improve upon traditional wood-polymer composites by producing a hardened wood wherein the original color of the untreated wood is preserved, and wherein the wood is treated uniformly in sapwood and heartwood, and does not warp during the polymerisation of the polymer inside the wood.
In a first aspect, the present invention provides an impregnation composition for maintaining the original color of the untreated wood after treatment. It has been found that low molecular weight monomers having a molecular weight comprised between 300 and 400, such as methyl acrylate or methyl methacrylate, produce less discoloration during polymerisation than high molecular weight monomers such as isodecyl acrylate or styrene. It has also been found that by adding as ari additive to the monomers an aliphatic organic acid having the formula 4 _ CH3-(CH2)n-COOH, n being a number between 1 and 17, such as propionic, palmitic or stearic acid, one may improve greatly the retention of the original color of the wood.
It is important to note that the additives do not contain unsaturated carbon-carbon bonds which would make the end-product more susceptible to UV
discoloration. In fact, the addition of these acids seems to provide some UV-stabilisation effect.
In another aspect, the present invention provides a method for hardening wood, in which the wood is impregnated with an impregnating composition such as one described hereinabove, at a pressure higher than 1000 psi. It has been found that by simply increasing the pressure of impregnation at a pressure higher than 1000 psi and preferably up to 3000 psi while keeping low viscosity formulation, one may achieve a more uniform impregnation .
In a further aspect of the invention, there is provided an apparatus for performing the above-mentioned impregnation method. The apparatus for impregnating wood articles at pressures higher than 1000 psi comprises an impregnating cylinder for receiving a cartridge which embodies an untreated wood, two hydraulic cylinders on which the impregnating cylinder is mounted on a pair of hydraulic cylinders for sealing the impregnating cylinder and pumping a hydraulic fluid into the impregnating cylinder.
Hence it is made possible to do very high pressure impregnations (3000 psi) on an industrial scale by using a cylinder mechanism in which the doors can be rapidly opened and the interior of the impregnating cylinder easily accessed.
-BRIEF DESCRIPTION OF THE DRAWINGS
Fig.1 is a side view of a preferred embodiment of an impregnation apparatus 5 according to the invention;
Fig.2 is a side view of the impregnation apparatus in a ready-to-be-closed position.
Fig. 3 is a side view of the impregnation apparatus in a closed position, where the doors are sealed.
Fig. 4 is a top view of the impregnation apparatus.
DETAILED DESCRIPTION OF THE INVENTION
As mentioned hereinabove, the impregnation composition according to the invention comprises low molecular weight monomers. These monomers have a molecular weight varying between 300 and 400. The monomers intended for use in the impregnation composition are selected from the group comprising:
acrylamide, 4-hydroxybutyl acrylate, butyl acrylate, ethyl acrylate, isodecyl acrylate, lauryl acrylate, octadecyl acrylate, stearyl acrylate, acrylonitrile, divinyl benzene, ethylene glycol dimethacrylate, furfuryl alcohol, methacrylamide, allyl methacrylate, butyl methacrylate, ethyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, isodecyl methacrylate, lauryl methacrylate, methyl methacrylate and chlorure de vinylidene. The composition may preferably comprise an aliphatic organic acid having the general formula of CH3-(CHZ)n-COOH, n being a number between 1 and 17.
' CA 02248224 1998-10-08 A typical formulation used to produce original-color hardened wood could be:
MMA lmethyl methacrylate) 5%
VAZO-52 0.5 S Palmitic acid 10%
where VAZO-52 is pentanenitrile 2,4-dimethyl 2,2 azobis.
The impregnation method for hardening wood in which the wood is impregnated with an impregnating composition at pressures higher than 1000 psi comprises essentially the steps of:
-loading an impregnating cylinder with a cartridge containing an untreated wood;
-pumping hydraulic fluid under pressure into the hydraulic cylinder;
-impregnating the wood under pressure for approximately 5 minutes at ambiant temperature; and -releasing the pressure and removing the impregnating mixture.
More precisely, the method comprises:
STEP I IcLding As can be seen in Fig. 1, small hydraulic cylinders (7) hold the impregnation cylinder (3) up while the wood cartridge (1 1 ) is put inside. The impregnating cylinder (3) is located at the level of the conveyors (13), above the hydraulic cylinders 15) and a cartridge (11 containing the wood to be impregnated is loaded into the impregnating cylinder (3).
Once the wood is inside the cylinder, the impregnating cylinder is lowered and aligned with its doors (9) and hydraulic cylinders (5).
STEP 2 imn~egmation/r~ressurization Once the impregnating cylinder (3) is lowered, hydraulic fluid is pumped under pressure into the hydraulic cylinders (5) using the pistons to move and the doors to seal the cylinder. Since typical hydraulic pressures are upwards of 3000 psi, it is now possible to increase the pressure inside the impregnation cylinder (3) to very high pressures. If the pressure remains steady for a significant period of time, such as 1 to 10 minutes, it means that the impregnation reached all the zones of the wood, and that the impregnation step is finished.
STEP 3 unloading_ Once the impregnation at high pressure is finished, the pressure inside the impregnation cylinder (3) is released, excess impregnation solution and pressure inside the hydraulic cylinders (5) are removed, the doors are pulled (9), the impregnating cylinder (3) is lifted and the wood cartridge (11 ) is removed.
Claims (3)
1. An impregnating mixture comprising at least one low molecular weight monomer having a molecular weight comprised between 300 and 400, and an aliphatic organic acid having the formula CH3-(CH2)n-COOH, n being a number between 1 and 17.
2. A method for hardening wood wherein the wood is impregnated with an impregnating mixture as claimed in claim 1 at a pressure higher than 1000 psi.
3. An apparatus for impregnating wood articles at a pressure higher than 1000 psi comprising:
-an impregnating cylinder for receiving a cartridge which embodies an untreated wood;
-two hydraulic cylinders for holding the impregnating cylinder; and -a pair of hydraulic cylinders for sealing the impregnating cylinder and pumping a hydraulic fluid into the impregnating cylinder.
-an impregnating cylinder for receiving a cartridge which embodies an untreated wood;
-two hydraulic cylinders for holding the impregnating cylinder; and -a pair of hydraulic cylinders for sealing the impregnating cylinder and pumping a hydraulic fluid into the impregnating cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2248224 CA2248224A1 (en) | 1998-10-08 | 1998-10-08 | Method for hardening wood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2248224 CA2248224A1 (en) | 1998-10-08 | 1998-10-08 | Method for hardening wood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2248224A1 true CA2248224A1 (en) | 2000-04-08 |
Family
ID=29409941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2248224 Abandoned CA2248224A1 (en) | 1998-10-08 | 1998-10-08 | Method for hardening wood |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2248224A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101618559B (en) * | 2009-04-22 | 2011-09-28 | 宁波高新区木圣科技有限公司 | Medicated liquid pressuring and injecting method for log modification |
-
1998
- 1998-10-08 CA CA 2248224 patent/CA2248224A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101618559B (en) * | 2009-04-22 | 2011-09-28 | 宁波高新区木圣科技有限公司 | Medicated liquid pressuring and injecting method for log modification |
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| FZDE | Dead |