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WO1997007373A1 - Method and device of cooling for use in connection with hot drying/heat treatment of lumber - Google Patents

Method and device of cooling for use in connection with hot drying/heat treatment of lumber Download PDF

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Publication number
WO1997007373A1
WO1997007373A1 PCT/FI1996/000446 FI9600446W WO9707373A1 WO 1997007373 A1 WO1997007373 A1 WO 1997007373A1 FI 9600446 W FI9600446 W FI 9600446W WO 9707373 A1 WO9707373 A1 WO 9707373A1
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WO
WIPO (PCT)
Prior art keywords
lumber
shield gas
cooling
heat
treatment
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.)
Ceased
Application number
PCT/FI1996/000446
Other languages
French (fr)
Inventor
Jan-Henrik Sievers
Toni Kotiranta
Jori Tasa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Original Assignee
Valmet Oy
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 Valmet Oy filed Critical Valmet Oy
Publication of WO1997007373A1 publication Critical patent/WO1997007373A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
    • 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
    • B27K5/0085—Thermal treatments, i.e. involving chemical modification of wood at temperatures well over 100°C
    • 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 concerns a method of cooling for use in connection with hot drying / heat treatment of lumber, in which method lumber is hot-dried / heat-treated in a device, which has been formed as a treatment space, which is at least substantially free from oxygen, in which treatment space the lumber load to be treated is placed, and in which space the lumber load is hot-dried / heat-treated by the intermediate of a heating member.
  • the invention concerns a device for use in connection with hot drying / heat treatment of lumber, which device has been formed as a treatment space at least substantially free from oxygen, in which space a lumber load is placed, and in which treatment space a heating member is placed for hot drying / heat treatment of the lumber load.
  • lumber can be hot-dried/heat-treated at a high temperature in order to dry the lumber and/or to improve the properties of preserva ⁇ tion of the lumber.
  • lumber is treated at high tempera ⁇ tures, for example 180...230 °C, and the treatment time is 2...10 hours.
  • the heat treatment is carried out in spaces substantially free from oxygen.
  • the lumber After the hot drying / heat treatment, the lumber is cooled, and the cooling must also take place in a space substantially free from oxygen, because of the risk of ignition, at least until the temperature of the lumber has gone down below the heat damage limit, which is about 75 °C.
  • the expression heat damage limit refers to the temperature below which the lumber can be taken out of the equipment without a charring risk or a risk of some other damage to the lumber.
  • the lumber In the prior-art arrangements the lumber has been allowed to cool down freely in the heat treatment equipment, in which case the cooling time has been about 15...30 hours for a lumber quantity of 10...60 cubic metres. This cooling time corresponds to 60...90 per cent of the overall treatment time.
  • the heat treatment equipment has been occupied by the cooling of the lumber for a remarkably long period of time, during which time the heat treatment capacity of the equipment has not been available for use.
  • the method in accordance with the invention is mainly characterized in that, in the method, after the hot-drying/heat-treatment stage, the lumber load is cooled by means of a shield gas supplied into the treatment space and/or by means of a cooling element present in the treatment space at least for a period of time long enough so that the temperature of the lumber load is lowered below the heat damage limit.
  • the device in accordance with the invention is mainly character ⁇ ized in that, further, in the treatment space in the device, members are fitted for the supply of a shield gas into the treatment space and/or a cooling element is placed for cooling of the lumber load.
  • the cooling time of a lumber load of, for example, 10...30 cu.m is about 1.5 to 10 hours, depending on the mode of cooling. Owing to the shorter cooling time, the drying/heat-treatment capacity of the equipment can be increased.
  • the lumber is cooled either by means of a shield gas or by means of a separate cooling unit.
  • a separate cooling unit it is possible to use, for example, water as the cooling medium.
  • the medium that circulates in the cooling element is, for example, water.
  • the circulation through the radiator can be either closed or open. In an open system the cold water is first pumped through the radiator, after which the water is first passed into the sewer or to a site where warm water can be utilized. In a closed system, the amount of water contained in the circulation through the radiator remains unchanged, in which case the system has a separate heat exchanger, in which the water is cooled.
  • the medium at the secondary side of the heat exchanger can be, for example, water or some cold substance.
  • such an amount of cooling shield gas is fed into the equipment that the required cooling capacity is achieved.
  • the oxygen content also remains low automatically.
  • blowers are used, which produce movement of air in the interior of the equipment, whereby the transfer of heat from the lumber to the air is improved.
  • the blower is placed after the cooling element, and the air that circulates in the equipment passes through the cooling element.
  • any non-flammable, inert gas is suited that is harmless to man and to the environment.
  • nitrogen, argon, carbon dioxide and carbon monoxide are examples of non-flammable, inert gas.
  • vapour In said prior-art solution related to heat treatment of lumber, during the heating cycle, water vapour is used as the shield gas, but vapour can, however, not be used readily during the cooling cycle, because the vapour is condensed on the face of the cooling element and because, on condensation of the water vapour, the equipment is, thus, subjected to a vacuum, because the specific volume of water vapour is reduced considerably when the vapour is condensed to liquid.
  • the capacity of the heat treatment process can be increased by means of simple arrange ⁇ ments when the heat treatment equipment is combined with a cooling equipment.
  • FIG. 1 is a schematic illustration of an exemplifying embodiment of the cooling arrangement in accordance with the invention
  • Figure 2 is a schematic illustration of cooling curves, without cooling and when shield-gas cooling is used
  • FIG. 3 is a schematic illustration of a second exemplifying embodiment of the cooling arrangement in accordance with the invention.
  • FIG. 4 is a schematic illustration of cooling curves when a cooling element is used.
  • Fig. 1 shows the device 10 as a treatment space 17, in whose interior there is a heating element 12, such as an electric resistor, for heating.
  • the lumber load placed in the treatment space 17 is denoted with the reference numeral 11.
  • the blower that circulates the air is denoted with the reference numeral 13.
  • the supply 14 of shield gas can be regulated by means of a regulation valve 15.
  • shield gas is supplied into the treatment space 17 through the shield gas supply 14.
  • the shield gas is cold, so that the necessary cooling capacity is produced.
  • oxygenous air is not transferred from the surrounding air into the interior of the treatment space 17 in the equipment 10.
  • the shield gas that is used in the equipment 10 is nitrogen, whose feed rate is 20 mol/s.
  • the vertical axis represents the tempera ⁇ ture, and the horizontal axis represents the time.
  • the upper curve illustrates a situation in which no cooling is employed, the middle curve a situation with nitrogen at a temperature of +30 °C, and the lower curve represents a situation in which nitrogen at -10 °C is employed as the cooling shield gas. It is seen from the curves that, when cooling is employed, the time taken by the cooling of the lumber is shortened considerably.
  • the exemplifying embodiment of the invention shown in Fig. 3 is similar to that shown in Fig. 1, but in this exemplifying embodi ⁇ ment a separate cooling element 20 has also been fitted in the treatment space 17 of the equipment, into which cooling element 20 cooling medium is passed through the feed pipe 21, and the cooling medium is removed through the pipe 22.
  • the amount of the cooling medium can be regulated by means of the valve 23.
  • a shield gas is fed into the interior of the equipment 10 through the feed pipe 14, and the extra gas is removed through the pipe 16.
  • the supply of shield gas can be regulated by means of the valve 15 under control of the control device 18.
  • FIG. 4 illustrates the temperature of the lumber as a function of time when a cooling element is used, the topmost curve illustrating the temperature of the lumber, the next curve the temperature of the building, and the lowest curve represents the temperature of the air.
  • the vertical axis represents the temperature and the horizon- tal axis the time. It is seen from the curves that the cooling of the lumber is very rapid. In comparison with the curves in Fig. 2, it can be ascertained that, when a cooling element is used, the cooling is 10...13 times quicker.
  • the shield gas for example, nitrogen, argon, carbon dioxide or carbon monoxide
  • other non-flammable gases that are inert to man and harmless to the environ ⁇ ment are suitable for use as a shield gas.
  • the temperature of introduction of the shield gas is 0... +30 °C, preferably +10... +20 °C.
  • cooling medium preferably water can be used as the cooling medium, but freon or some other, equivalent medium, for example air, is also suitable for use.
  • freon or some other, equivalent medium for example air
  • the temperature of the cooling medium is determined in accordance with the medium that is used, and the cooling element is also dimensioned based on said medium.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The invention concerns a method of cooling for use in connection with hot drying/heat treatment of lumber, in which method lumber is hot-dried/heat-treated in a device (10), which has been formed as a treatment space (17), which is at least substantially free from oxygen, in which treatment space (17) the lumber load (11) to be treated is placed, and in which space the lumber load (11) is hot-dried/heat-treated by the intermediate of a heating member (12). In the method, after the hot-drying/heat-treatment stage, the lumber load (11) is cooled by means of a shield gas supplied into the treatment space (17) and/or by means of a cooling element present in the treatment space (17) at least for a period of time long enough so that the temperature of the lumber load (11) is lowered below the heat-damage limit. Further, the invention concerns a device for use in connection with hot drying/heat treatment of lumber.

Description

Method and device of cooling for use in connection with hot drying / heat treatment of lumber
The invention concerns a method of cooling for use in connection with hot drying / heat treatment of lumber, in which method lumber is hot-dried / heat-treated in a device, which has been formed as a treatment space, which is at least substantially free from oxygen, in which treatment space the lumber load to be treated is placed, and in which space the lumber load is hot-dried / heat-treated by the intermediate of a heating member.
Further, the invention concerns a device for use in connection with hot drying / heat treatment of lumber, which device has been formed as a treatment space at least substantially free from oxygen, in which space a lumber load is placed, and in which treatment space a heating member is placed for hot drying / heat treatment of the lumber load.
As is known from the prior art, lumber can be hot-dried/heat-treated at a high temperature in order to dry the lumber and/or to improve the properties of preserva¬ tion of the lumber. In the heat-treatment process, lumber is treated at high tempera¬ tures, for example 180...230 °C, and the treatment time is 2...10 hours. In view of the risk of ignition and charring of the lumber, the heat treatment is carried out in spaces substantially free from oxygen.
After the hot drying / heat treatment, the lumber is cooled, and the cooling must also take place in a space substantially free from oxygen, because of the risk of ignition, at least until the temperature of the lumber has gone down below the heat damage limit, which is about 75 °C. In the present description, the expression heat damage limit refers to the temperature below which the lumber can be taken out of the equipment without a charring risk or a risk of some other damage to the lumber. In the prior-art arrangements the lumber has been allowed to cool down freely in the heat treatment equipment, in which case the cooling time has been about 15...30 hours for a lumber quantity of 10...60 cubic metres. This cooling time corresponds to 60...90 per cent of the overall treatment time. Thus, the heat treatment equipment has been occupied by the cooling of the lumber for a remarkably long period of time, during which time the heat treatment capacity of the equipment has not been available for use.
With respect to the prior art related to heat treatment of lumber, reference is made to the published WO Patent Application No. 94/27102, wherein a method is described for improving the resistance to biological decomposition of cellulosic products and for improving the dimensional stability of said products. In this prior- art method the products are treated at a hot temperature so as to achieve the desired reduction in weight.
It is an important object of the present invention to suggest a solution for a method and device for cooling of lumber for use after hot drying / heat treatment, which method is quicker than the prior-art procedure but which does, however, not involve a risk of ignition of the lumber.
In view of achieving the objectives stated above and those that will come out later, the method in accordance with the invention is mainly characterized in that, in the method, after the hot-drying/heat-treatment stage, the lumber load is cooled by means of a shield gas supplied into the treatment space and/or by means of a cooling element present in the treatment space at least for a period of time long enough so that the temperature of the lumber load is lowered below the heat damage limit.
On the other hand, the device in accordance with the invention is mainly character¬ ized in that, further, in the treatment space in the device, members are fitted for the supply of a shield gas into the treatment space and/or a cooling element is placed for cooling of the lumber load. When lumber is cooled in accordance with the present invention, the cooling time of a lumber load of, for example, 10...30 cu.m is about 1.5 to 10 hours, depending on the mode of cooling. Owing to the shorter cooling time, the drying/heat-treatment capacity of the equipment can be increased.
In the method of the present invention, the lumber is cooled either by means of a shield gas or by means of a separate cooling unit. When a separate cooling unit is used, it is possible to use, for example, water as the cooling medium.
Since the specific volume of the air present in the interior of the equipment is reduced because of the cooling (according to the equation of ideal gas N = ΝRT/P), the vacuum that is produced is substituted for by the shield gas. In this way, access of oxygenous outdoor air into the treatment space is prevented, and thereby it is ensured that the lumber does not ignite.
The medium that circulates in the cooling element, such as a radiator, is, for example, water. The circulation through the radiator can be either closed or open. In an open system the cold water is first pumped through the radiator, after which the water is first passed into the sewer or to a site where warm water can be utilized. In a closed system, the amount of water contained in the circulation through the radiator remains unchanged, in which case the system has a separate heat exchanger, in which the water is cooled. The medium at the secondary side of the heat exchanger can be, for example, water or some cold substance.
According to a second exemplifying embodiment of the invention, such an amount of cooling shield gas is fed into the equipment that the required cooling capacity is achieved. In such a case, the oxygen content also remains low automatically.
According to a preferred exemplifying embodiment of the invention, during cooling, blowers are used, which produce movement of air in the interior of the equipment, whereby the transfer of heat from the lumber to the air is improved. In an embodi- ment with a cooling element, the blower is placed after the cooling element, and the air that circulates in the equipment passes through the cooling element.
As the shield gas used in connection with cooling, almost any non-flammable, inert gas is suited that is harmless to man and to the environment. As examples can be mentioned nitrogen, argon, carbon dioxide and carbon monoxide.
In said prior-art solution related to heat treatment of lumber, during the heating cycle, water vapour is used as the shield gas, but vapour can, however, not be used readily during the cooling cycle, because the vapour is condensed on the face of the cooling element and because, on condensation of the water vapour, the equipment is, thus, subjected to a vacuum, because the specific volume of water vapour is reduced considerably when the vapour is condensed to liquid.
When the method and the device in accordance with the invention are used, the capacity of the heat treatment process can be increased by means of simple arrange¬ ments when the heat treatment equipment is combined with a cooling equipment.
In the following the invention will be described in more detail with reference to the figures in the accompanying drawing, wherein
Figure 1 is a schematic illustration of an exemplifying embodiment of the cooling arrangement in accordance with the invention,
Figure 2 is a schematic illustration of cooling curves, without cooling and when shield-gas cooling is used,
Figure 3 is a schematic illustration of a second exemplifying embodiment of the cooling arrangement in accordance with the invention, and
Figure 4 is a schematic illustration of cooling curves when a cooling element is used. Fig. 1 shows the device 10 as a treatment space 17, in whose interior there is a heating element 12, such as an electric resistor, for heating. The lumber load placed in the treatment space 17 is denoted with the reference numeral 11. The blower that circulates the air is denoted with the reference numeral 13. The supply 14 of shield gas can be regulated by means of a regulation valve 15. In this arrangement of the invention, shield gas is supplied into the treatment space 17 through the shield gas supply 14. The shield gas is cold, so that the necessary cooling capacity is produced. By means of the supply of shield gas, it is also achieved that oxygenous air is not transferred from the surrounding air into the interior of the treatment space 17 in the equipment 10.
In the cooling curves shown in Fig. 2 the shield gas that is used in the equipment 10 is nitrogen, whose feed rate is 20 mol/s. The vertical axis represents the tempera¬ ture, and the horizontal axis represents the time. The upper curve illustrates a situation in which no cooling is employed, the middle curve a situation with nitrogen at a temperature of +30 °C, and the lower curve represents a situation in which nitrogen at -10 °C is employed as the cooling shield gas. It is seen from the curves that, when cooling is employed, the time taken by the cooling of the lumber is shortened considerably.
As regards its principal features, the exemplifying embodiment of the invention shown in Fig. 3 is similar to that shown in Fig. 1, but in this exemplifying embodi¬ ment a separate cooling element 20 has also been fitted in the treatment space 17 of the equipment, into which cooling element 20 cooling medium is passed through the feed pipe 21, and the cooling medium is removed through the pipe 22. The amount of the cooling medium can be regulated by means of the valve 23. Also in this exemplifying embodiment, a shield gas is fed into the interior of the equipment 10 through the feed pipe 14, and the extra gas is removed through the pipe 16. The supply of shield gas can be regulated by means of the valve 15 under control of the control device 18. Fig. 4 illustrates the temperature of the lumber as a function of time when a cooling element is used, the topmost curve illustrating the temperature of the lumber, the next curve the temperature of the building, and the lowest curve represents the temperature of the air. The vertical axis represents the temperature and the horizon- tal axis the time. It is seen from the curves that the cooling of the lumber is very rapid. In comparison with the curves in Fig. 2, it can be ascertained that, when a cooling element is used, the cooling is 10...13 times quicker.
In the arrangement in accordance with the invention, it is possible to use, for example, nitrogen, argon, carbon dioxide or carbon monoxide as the shield gas, but also other non-flammable gases that are inert to man and harmless to the environ¬ ment are suitable for use as a shield gas. The temperature of introduction of the shield gas is 0... +30 °C, preferably +10... +20 °C.
In an exemplifying embodiment of the invention in which a separate cooling element is used, preferably water can be used as the cooling medium, but freon or some other, equivalent medium, for example air, is also suitable for use. The temperature of the cooling medium is determined in accordance with the medium that is used, and the cooling element is also dimensioned based on said medium.
Above, the invention has been described with reference to some preferred exemplify¬ ing embodiments of same only, the invention being, however, not supposed to be strictly confined to the details of said embodiments. Many variations and modifica¬ tions are possible within the scope of the inventive idea defined in the following patent claims.

Claims

Claims
1. A method of cooling for use in connection with hot drying / heat treatment of lumber, in which method lumber is hot-dried / heat-treated in a device (10), which has been formed as a treatment space (17), which is at least substantially free from oxygen, in which treatment space (17) the lumber load (11) to be treated is placed, and in which space the lumber load (11) is hot-dried / heat-treated by the intermedi¬ ate of a heating member (12), characterized in that, in the method, after the hot- drying/heat-treatment stage, the lumber load (11) is cooled by means of a shield gas supplied into the treatment space (17) and/or by means of a cooling element (20) present in the treatment space (17) at least for a period of time long enough so that the temperature of the lumber load (11) is lowered below the heat-damage limit.
2. A method as claimed in claim 1, characterized in that, in the method, the shield gas present in the treatment space (17) is circulated by means of a blower (13) or equivalent.
3. A method as claimed in claim 1 or 2, characterized in that, in the method, as the shield gas, a non-flammable gas is used that is inert to man and/or harmless to the environment.
4. A method as claimed in claim 3, characterized in that nitrogen is used as the shield gas.
5. A method as claimed in claim 3, characterized in that argon is used as the shield gas.
6. A method as claimed in claim 3, characterized in that carbon dioxide is used as the shield gas.
7. A method as claimed in claim 3, characterized in that carbon monoxide is used as the shield gas.
8. A device for use in connection with hot drying / heat treatment of lumber, which device (10) has been formed as a treatment space (17) at least substantially free from oxygen, in which space a lumber load (11) is placed, and in which treatment space (17) a heating member (12) is placed for hot drying / heat treatment of the lumber load (11), characterized in that, further, in the treatment space (17) in the device (10), members (14,15) are fitted for the supply of a shield gas into the treatment space (17) and/or a cooling element (20) is placed for cooling the lumber load (11).
9. A device as claimed in claim 8, characterized in that in the treatment space (17) of the device (10) there is a blower (13) or equivalent for circulating the shield gas in the treatment space (17).
10. A device as claimed in claim 8 or 9, characterized in that the shield gas is non-flammable gas inert to man and/or harmless to the environment.
11. A device as claimed in claim 8 or 9, characterized in that nitrogen is used as the shield gas.
12. A device as claimed in claim 8 or 9, characterized in that argon is used as the shield gas.
13. A device as claimed in claim 8 or 9, characterized in that carbon dioxide is used as the shield gas.
14. A device as claimed in claim 8 or 9, characterized in that carbon monoxide is used as the shield gas.
15. A device as claimed in any of the preceding claims, characterized in that the members (14,15) in the device (10) for the supply of shield gas comprise a feed pipe (14) and a valve (15).
PCT/FI1996/000446 1995-08-21 1996-08-20 Method and device of cooling for use in connection with hot drying/heat treatment of lumber Ceased WO1997007373A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI953913 1995-08-21
FI953913A FI953913A7 (en) 1995-08-21 1995-08-21 Cooling method and device used in connection with heat drying/heat treatment of timber

Publications (1)

Publication Number Publication Date
WO1997007373A1 true WO1997007373A1 (en) 1997-02-27

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WO (1) WO1997007373A1 (en)

Cited By (10)

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Publication number Priority date Publication date Assignee Title
FR2786426A1 (en) * 1998-11-27 2000-06-02 Arimpex Sarl Method of thermal treatment of ligneous-cellulose (wood) material with elimination of oxygen in the gaseous phase
FR2786424A1 (en) * 1998-11-27 2000-06-02 Arimpex Sarl Thermal treatment of wood materials to improve resistance to external attack, dimensional stability and mechanical resistance
FR2786425A1 (en) * 1998-11-27 2000-06-02 Arimpex Sarl Thermal treatment of wood materials with cooling stage to improve physical and chemical properties, especially mechanical strength
WO2000053985A1 (en) * 1999-03-09 2000-09-14 Jean Laurencot Device for high temperature heat treatment of ligneous material
WO2001032372A1 (en) * 1999-10-29 2001-05-10 Aracruz Celulose S.A. A method for preventing or controlling the occurrence of stains on wood
EP1009542A4 (en) * 1997-05-21 2002-04-17 Danny J Elder Process for treating green wood and accelerating drying of green wood
WO2003014644A1 (en) * 2001-08-11 2003-02-20 Dunne, Terence, Patrick Processing of organic material
FR2854831A1 (en) * 2003-05-15 2004-11-19 Gie Le Bois Pyrogene Oven for treating wood at high temperature, comprises chamber for piled wood which has valves to pulse heat from side accumulation compartments heated by pipes containing hot fluid coming from outside
WO2016162591A1 (en) * 2015-04-09 2016-10-13 Juhani Kuisma Thermal treatment kiln and a method for thermo-treating timber
EP2720839B1 (en) * 2011-06-16 2025-01-29 WDE MASPELL S.r.l. High temperature thermal modification process of wood in a vacuum autoclave

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Publication number Priority date Publication date Assignee Title
FI974467A0 (en) 1997-12-09 1997-12-09 Stellac Oy Avkylningsfoerfarande

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US1059820A (en) * 1912-04-08 1913-04-22 Eduard Rudolph Besemfelder Method of drying damp materials.
US4308668A (en) * 1979-06-04 1982-01-05 Mitsubishi Jukogyo Kabushiki Kaisha Process for heat treatment of coal
US4785554A (en) * 1986-11-27 1988-11-22 Uhde Gmbh Method and apparatus for conditioning bulk material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1059820A (en) * 1912-04-08 1913-04-22 Eduard Rudolph Besemfelder Method of drying damp materials.
US4308668A (en) * 1979-06-04 1982-01-05 Mitsubishi Jukogyo Kabushiki Kaisha Process for heat treatment of coal
US4785554A (en) * 1986-11-27 1988-11-22 Uhde Gmbh Method and apparatus for conditioning bulk material

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1009542A4 (en) * 1997-05-21 2002-04-17 Danny J Elder Process for treating green wood and accelerating drying of green wood
FR2786424A1 (en) * 1998-11-27 2000-06-02 Arimpex Sarl Thermal treatment of wood materials to improve resistance to external attack, dimensional stability and mechanical resistance
FR2786425A1 (en) * 1998-11-27 2000-06-02 Arimpex Sarl Thermal treatment of wood materials with cooling stage to improve physical and chemical properties, especially mechanical strength
FR2786426A1 (en) * 1998-11-27 2000-06-02 Arimpex Sarl Method of thermal treatment of ligneous-cellulose (wood) material with elimination of oxygen in the gaseous phase
WO2000053985A1 (en) * 1999-03-09 2000-09-14 Jean Laurencot Device for high temperature heat treatment of ligneous material
FR2790698A1 (en) * 1999-03-09 2000-09-15 Jean Laurencot DEVICE FOR THE HIGH TEMPERATURE HEAT TREATMENT OF A WOODY MATERIAL
AU771449B2 (en) * 1999-10-29 2004-03-25 Aracruz Celulose S.A. A method for preventing or controlling the occurrence of stains on wood
WO2001032372A1 (en) * 1999-10-29 2001-05-10 Aracruz Celulose S.A. A method for preventing or controlling the occurrence of stains on wood
US6718653B1 (en) 1999-10-29 2004-04-13 Aracruz Celulose S.A. Method for preventing or controlling the occurrence of stains on wood
WO2003014644A1 (en) * 2001-08-11 2003-02-20 Dunne, Terence, Patrick Processing of organic material
EA008518B1 (en) * 2001-08-11 2007-06-29 Данн, Теренс Патрик Processing of organic material
KR100858888B1 (en) * 2001-08-11 2008-09-17 듄, 테렌스, 패트릭 Organic material processing method and processing apparatus
CN100422681C (en) * 2001-08-11 2008-10-01 特伦斯·帕特里克·邓尼 Treatment of organic materials
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