EP2196295A1 - Bois et son procédé ainsi que son dispositif de fabrication - Google Patents

Bois et son procédé ainsi que son dispositif de fabrication Download PDF

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Publication number
EP2196295A1
EP2196295A1 EP08170751A EP08170751A EP2196295A1 EP 2196295 A1 EP2196295 A1 EP 2196295A1 EP 08170751 A EP08170751 A EP 08170751A EP 08170751 A EP08170751 A EP 08170751A EP 2196295 A1 EP2196295 A1 EP 2196295A1
Authority
EP
European Patent Office
Prior art keywords
wood
temperature
range
treatment
treated
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.)
Withdrawn
Application number
EP08170751A
Other languages
German (de)
English (en)
Inventor
Lothar Clauder
Klaus Dreiner
Heinz Frommhold
Ronny Syben
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.)
Fachhochschule Eberswalde
Original Assignee
Fachhochschule Eberswalde
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 Fachhochschule Eberswalde filed Critical Fachhochschule Eberswalde
Priority to EP08170751A priority Critical patent/EP2196295A1/fr
Priority to PCT/EP2009/066400 priority patent/WO2010063822A1/fr
Priority to DE112009003678T priority patent/DE112009003678A5/de
Priority to DE202009018842U priority patent/DE202009018842U1/de
Publication of EP2196295A1 publication Critical patent/EP2196295A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B27K5/0085—Thermal treatments, i.e. involving chemical modification of wood at temperatures well over 100°C
    • B27K5/009—Thermal treatments, i.e. involving chemical modification of wood at temperatures well over 100°C using a well-defined temperature schedule
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
    • F26B21/30—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/35—Temperature; Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
    • F26B21/40—Arrangements for supplying or controlling air or other gases for drying solid materials or objects using gases other than air
    • 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 goods
    • F26B2210/16—Wood, e.g. lumber, timber

Definitions

  • the invention relates to a wood and a method and an apparatus for its production. Furthermore, the invention relates to a use of the wood.
  • a variety of species of tropical regions have advantages over domestic woods, they usually have greater hardness, bulk density, durability, abrasion resistance, fungal and insect resistance. The depletion of tropical forests and the associated decline in this resource are forcing the search for alternatives.
  • Thermally treated (modified) wood is wood that has been treated at temperatures above 160 ° C and sometimes high pressures, resulting in a permanent change in the properties of the wood across the entire wood cross section.
  • the heat treatment to a change in the chemical composition of the wood and to a degradation of hemicellulose and ⁇ -cellulose, an expulsion of resins, a reduction in the number of hydroxyl groups and an increase in the relative lignin content.
  • the pH of the thermally treated wood is lower than that of untreated wood due to the resulting organic acids.
  • wood preservatives are known methods in which the durability of a wood is increased by wood preservatives.
  • the wood preservatives are introduced by brushing, spraying or pressing by means of pressure on or in the wood.
  • a disadvantage of these methods is the Cost and time required for refreshing the protective measure in intervals.
  • the wood preservatives can reach the soil uncontrollably during use by washing out. The disposal required after use is equally critical.
  • Object of the present invention is therefore to provide a thermally treated wood (thermowood), which can be produced regardless of the type of wood in a reproducible product quality.
  • the object of the present invention is achieved by a wood obtained by treating wood in two or more steps at a pressure in the range of 860 to 1090 hPa in an inert gas atmosphere at temperatures in the first step in the range of 20 to 150 ° C and in the second Step in the range of more than 150 ° C is available.
  • a pressure increase by the expansion of the gas at elevated temperature during the heat treatment of the wood is thereby avoided by a pressure equalization.
  • the inert gas is preferably selected from nitrogen, argon, neon, helium, carbon dioxide (CO 2 ), nitrous oxide (N 2 O) or mixtures thereof. Due to the heat treatment under inert gas, wood is obtained in a consistent quality.
  • the inert gas is used to increase the presence of oxygen as a reactant in chemical decomposition processes (heat treatment) to reduce.
  • heat treatment chemical decomposition processes
  • wood preservatives can be dispensed with, which preserves the environmental friendliness of the wood.
  • the wood is treated by raising the temperature to a temperature in the range of 80 to 120 ° C in the first step, holding this temperature for 5 to 40 hours, especially for 5 to 15 hours, and then the Temperature further increased. During the dwell time the wood is warmed up and the remaining wood moisture escapes.
  • the wood is treated in the second step with temperatures in the range of 160 to 200 ° C. In this temperature range, the heat treatment of the wood takes place.
  • the object of the present invention is achieved by a method for producing the wood according to the invention, in which wood in two or more steps at a pressure in the range of 860 to 1090 hPa in an inert gas atmosphere with temperatures in the first step in the range of 20 to 150 ° C and treated in the second step in the range of more than 150 ° C.
  • the inertization takes place only above a temperature of about 105 ° C.
  • the method according to the invention also has the advantage of achieving thermally modified woods in reproducible product quality by adapting the process parameters (temperature / time) to the type of wood and the desired end product.
  • the inert gas is preferably selected from nitrogen, argon, neon, helium, carbon dioxide, nitrous oxide or a mixture thereof.
  • the inerting of the atmosphere for example by nitrogen or noble gases, allows the wood exposed to the heat treatment to have a homogeneous quality with uniform properties over the entire cross-section.
  • the temperature is raised in the first step to a temperature in the range of 80 to 120 ° C, this temperature is maintained for 5 to 40 hours, especially for 5 to 15 hours, then the temperature is further increased. The temperature is increased so far that the heat treatment of the wood to be treated is started.
  • the heat treatment of the wood is carried out at temperatures in the range of 140 to 260 ° C, preferably treating the wood in the second step with temperatures in the range of 160 to 200 ° C.
  • the duration of the heat treatment depends on the type of wood and the strength of the wood and can therefore be made variable.
  • the heat treatment of the wood is carried out for 55 to 75 hours (first and second steps).
  • the treatment of the wood at temperatures above 150 ° C (heat treatment in the second step), however, takes place only for a period of about 5 to 30 hours, especially for a period of 15 to 25 hours.
  • the treatment room is preferably generated before the treatment of the wood, a negative pressure and then filled the treatment room with the inert gas. Initially, the air in the treatment room is extracted. The inert gas is then introduced into the vacuum formed in this way.
  • the process according to the invention is carried out under atmospheric pressure. This allows, in contrast to known methods, a controlled, constant process flow which requires no pressure increase.
  • a gas flow is preferably produced during the treatment around the wood to be treated.
  • the treatment room has a blower.
  • the object of the present invention is achieved by a device consisting of a gas-tight treatment room, the at least one opening for introducing the wood into the treatment room, at least one closable opening for the supply or discharge of gases, at least one heat source with temperature controller and a pressure relief valve having.
  • the opening for the discharge of gases is connected to a vacuum pump, with which one pumps off the air located in the treatment chamber before the treatment of the wood. By pumping the air out of the treatment room, the pressure in the treatment room is reduced. The negative pressure generated in this way is used to direct the inert gas through the supply line into the treatment room.
  • the pressure relief valve serves to keep the (normal) pressure prevailing in the treatment chamber constant despite temperature changes.
  • the device comprises a fan for generating a gas flow around the wood to be treated. This serves to preserve the homogeneity of the heat treatment process.
  • the object of the present invention is achieved by a use of the wood according to the invention for the production of furniture, wood paneling, floors, doors or windows.
  • the wood according to the invention or the thermally modified wood produced by the process according to the invention, is suitable for outdoor use, since the durability is increased by the process, without the use of additives, and thus the positive characteristics of products made from wood.
  • the wood according to the invention has an increased resistance to pest infestation. Therefore, the wood according to the invention is particularly suitable as a substitute for tropical woods in outdoor areas, such as in window construction or terrace decks and garden furniture and noise barriers.
  • the desired homogeneous darker coloration of the entire treated wood cross-section allows a wide range of processing and application possibilities in furniture and interior design.
  • FIG. 1 shows a schematic representation of the method for producing the wood according to the invention.
  • the wood 1 to be treated is located in a treatment space 2 and is surrounded by heated, circulating inert gas (represented by the arrow). Before the heat treatment of the wood 1, a vacuum V is generated in the treatment space 2. Subsequently, the treatment chamber 2 is filled with an inert gas (protective gas) S.
  • inert gas protective gas
  • the heat treatment takes place in a gas-tight treatment space 2.
  • a gas-tight treatment space 2 Any conceivable container suitable for receiving the wood 1 to be treated and having sufficient stability to withstand the pressure changes resulting from the application of a vacuum can be used as the treatment space 2.
  • the container used for the heat treatment is evacuated before the start of the process by means of a vacuum pump.
  • a slight negative pressure of approximately 100 hPa (0.1 bar) is sufficient to fill the volume of the container with nitrogen (N 2 ) to approximately atmospheric pressure (1013.25 hPa).
  • N 2 nitrogen
  • the progressive increase in temperature during the process and the associated expansion of the gas in the atmosphere of the container is continuously adjusted by means of a pressure relief valve to normal pressure.
  • the FIG. 2 shows the temperature profile (temperature [° C] as a function of time) in the reactor (process example 190 ° C).
  • the three curves shown here represent the middle area (A), the surface (B) and the core (C) of the wood.
  • the wood is dried by means of technical drying to an average timber balance of approx. 10%.
  • the heat treatment of the wood starts at room temperature.
  • the temperature value is continuously increased with a heating rate depending on the material type and material thickness (T1-T2).
  • T1-T2 material type and material thickness
  • T2-T3 Holding time
  • the temperature is raised (T3-T4) and kept in a high-temperature phase (T4-T5).
  • the difference between the temperature values on the surface and in the core of the wood is kept substantially constant in the heating phases. With an approximately linear course of the two temperature curves and a maximum value for the temperature difference between surface and core, the quality of the end product can be granted.
  • the process of the invention results in consistent, i. reproducible results in the treatment of the inhomogeneous material wood. Compared with known methods, it is possible with the inventive method to produce thermally treated wood, which has almost identical properties over the entire cross section. Unwanted negative results, such as the loss of strength, occur only to a limited extent due to the method of production.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
EP08170751A 2008-12-04 2008-12-04 Bois et son procédé ainsi que son dispositif de fabrication Withdrawn EP2196295A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP08170751A EP2196295A1 (fr) 2008-12-04 2008-12-04 Bois et son procédé ainsi que son dispositif de fabrication
PCT/EP2009/066400 WO2010063822A1 (fr) 2008-12-04 2009-12-04 Bois, ainsi que procédé et dispositifs pour sa fabrication
DE112009003678T DE112009003678A5 (de) 2008-12-04 2009-12-04 Holz sowie Verfahren und Vorrichtungen zu dessen Herstellung
DE202009018842U DE202009018842U1 (de) 2008-12-04 2009-12-04 Holz sowie Vorrichtungen zu dessen Herstellung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08170751A EP2196295A1 (fr) 2008-12-04 2008-12-04 Bois et son procédé ainsi que son dispositif de fabrication

Publications (1)

Publication Number Publication Date
EP2196295A1 true EP2196295A1 (fr) 2010-06-16

Family

ID=40547940

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08170751A Withdrawn EP2196295A1 (fr) 2008-12-04 2008-12-04 Bois et son procédé ainsi que son dispositif de fabrication

Country Status (3)

Country Link
EP (1) EP2196295A1 (fr)
DE (2) DE112009003678A5 (fr)
WO (1) WO2010063822A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102225566A (zh) * 2011-04-22 2011-10-26 周彩球 一种高温热处理木材的生产方法
DK201670528A1 (en) * 2016-07-15 2018-02-19 Wtt Holding Aps A thermo treatment process for wood
WO2020127026A1 (fr) * 2018-12-19 2020-06-25 Ways Sas Procédé de séchage thermique du bois sous atmosphère de co2, installation de séchage pour la mise en oeuvre dudit procédé et produit obtenu
WO2024005649A1 (fr) 2022-06-27 2024-01-04 Saga Wood Holding As Appareil et procédé de traitement de modification et de conservation du bois
DK202530356A1 (en) * 2024-09-20 2026-04-08 Wtt Innovation Aps Wood Modification by Catalytic Conversion of Hemicelluloses
US12600056B2 (en) 2021-03-25 2026-04-14 Peter Klaas Combined process of hydrolysis and esterification of wood

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115179382A (zh) * 2022-06-15 2022-10-14 江西诺文斯家具有限公司 一种防潮家具及其制作工艺
DE102023109083A1 (de) * 2023-04-11 2024-10-17 Fiberboard Gmbh Verfahren zum Trocknen von Holzprodukten zum Erzeugen von Holzprodukten mit reduzierter VOC-Emission

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69501588T2 (de) 1994-05-11 1998-09-17 Valtion Teknillinen Verfahren zur bearbeitung von holz bei erhöhten temperaturen
FR2786426A1 (fr) * 1998-11-27 2000-06-02 Arimpex Sarl Procede de traitement thermique d'un materiau ligno-cellulosique avec elimination de l'oxygene en phase gazeuse
DE69800790T2 (de) 1997-12-09 2002-05-29 Stellac Oy, Mikkeli Verfahren zur Steuerung der Gaszirkulationsmenge in einem Holztrockner
FR2857291A1 (fr) * 2003-07-07 2005-01-14 Daniel Besson Procede et dispositif de traitement thermique haute temperature de matiere ligneuse

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE496745T1 (de) * 2003-11-25 2011-02-15 Ooo Spolisteks Holzbehandlungsmethode

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69501588T2 (de) 1994-05-11 1998-09-17 Valtion Teknillinen Verfahren zur bearbeitung von holz bei erhöhten temperaturen
DE69800790T2 (de) 1997-12-09 2002-05-29 Stellac Oy, Mikkeli Verfahren zur Steuerung der Gaszirkulationsmenge in einem Holztrockner
FR2786426A1 (fr) * 1998-11-27 2000-06-02 Arimpex Sarl Procede de traitement thermique d'un materiau ligno-cellulosique avec elimination de l'oxygene en phase gazeuse
FR2857291A1 (fr) * 2003-07-07 2005-01-14 Daniel Besson Procede et dispositif de traitement thermique haute temperature de matiere ligneuse

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102225566A (zh) * 2011-04-22 2011-10-26 周彩球 一种高温热处理木材的生产方法
DK201670528A1 (en) * 2016-07-15 2018-02-19 Wtt Holding Aps A thermo treatment process for wood
DK179238B1 (en) * 2016-07-15 2018-02-26 Wtt Holding Aps A thermo treatment process for wood
US10315331B2 (en) 2016-07-15 2019-06-11 Wtt Holding Aps Thermo treatment process for wood
WO2020127026A1 (fr) * 2018-12-19 2020-06-25 Ways Sas Procédé de séchage thermique du bois sous atmosphère de co2, installation de séchage pour la mise en oeuvre dudit procédé et produit obtenu
FR3090835A1 (fr) * 2018-12-19 2020-06-26 Ways [Procédé de séchage thermique de bois sous atmosphère CO2, installation de séchage pour la mise en œuvre dudit procédé et produit obtenu]
US12025374B2 (en) 2018-12-19 2024-07-02 Ways Sas Method for thermal drying of wood in a CO2 atmosphere, drying facility for implementing said method, and product obtained
US12600056B2 (en) 2021-03-25 2026-04-14 Peter Klaas Combined process of hydrolysis and esterification of wood
WO2024005649A1 (fr) 2022-06-27 2024-01-04 Saga Wood Holding As Appareil et procédé de traitement de modification et de conservation du bois
DK202530356A1 (en) * 2024-09-20 2026-04-08 Wtt Innovation Aps Wood Modification by Catalytic Conversion of Hemicelluloses

Also Published As

Publication number Publication date
DE202009018842U1 (de) 2013-11-13
WO2010063822A1 (fr) 2010-06-10
DE112009003678A5 (de) 2012-10-18

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