EP0854776B1 - Procede de retification du bois - Google Patents
Procede de retification du bois Download PDFInfo
- Publication number
- EP0854776B1 EP0854776B1 EP97935631A EP97935631A EP0854776B1 EP 0854776 B1 EP0854776 B1 EP 0854776B1 EP 97935631 A EP97935631 A EP 97935631A EP 97935631 A EP97935631 A EP 97935631A EP 0854776 B1 EP0854776 B1 EP 0854776B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wood
- gases
- hemicellulose
- treatment
- enclosure
- 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.)
- Expired - Lifetime
Links
- 239000002023 wood Substances 0.000 title claims abstract description 28
- 238000001723 curing Methods 0.000 title 1
- 238000011282 treatment Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 22
- 229920002488 Hemicellulose Polymers 0.000 claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 16
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 8
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 7
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 6
- 239000001569 carbon dioxide Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 4
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical group O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 2
- 238000004132 cross linking Methods 0.000 description 12
- 238000001035 drying Methods 0.000 description 10
- 238000002835 absorbance Methods 0.000 description 7
- 239000010875 treated wood Substances 0.000 description 7
- 241001070947 Fagus Species 0.000 description 6
- 235000010099 Fagus sylvatica Nutrition 0.000 description 6
- 229960004424 carbon dioxide Drugs 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 230000009477 glass transition Effects 0.000 description 5
- 229920005610 lignin Polymers 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 4
- 235000011613 Pinus brutia Nutrition 0.000 description 4
- 241000018646 Pinus brutia Species 0.000 description 4
- 241000726768 Carpinus Species 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 241000894007 species Species 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Images
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
- B27K5/0085—Thermal treatments, i.e. involving chemical modification of wood at temperatures well over 100°C
-
- 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
- B27K2240/70—Hydrophobation treatment
Definitions
- the present invention relates to an improvement high temperature wood treatment processes and in particular to so-called retification treatments.
- drying step removes water from the wood it does not change anything against the character hydrophilic of it, so that it is again suitable to reabsorb the water eliminated during drying when it again found in a humid atmosphere.
- the object of the present invention is to overcome this disadvantage by proposing a method allowing detect the end of the processing stage of the Retification.
- the wood is placed in a processing enclosure provided a sensor sensitive to acetic acid and / or dioxide carbon and / or carbon monoxide.
- temperature T in ° C
- time t in min
- Such a treatment process includes three stages, namely a drying stage A, a stage of glass transition B, and a crosslinking step proper C.
- the first drying step A breaks down into two phases, a first phase A 1 during which the temperature of the drying chamber containing the ash to be treated is gradually raised with a rate of temperature rise of approximately 5 ° C / min, from ambient temperature to a temperature T 1 , close to 100 ° C, followed by a phase A 2 during which the temperature of the enclosure is maintained at the level T 1 until the end of drying.
- the temperature of the enclosure is gradually raised, with a rate of temperature increase close to the previous one, from the temperature T 1 to a temperature T g of 170 ° C close to the glass transition temperature of the species of wood considered, namely ash in this case.
- the temperature T g is maintained at this plateau value for the time necessary for the entire mass of treated wood to reach the glass transition temperature T g . It will be noted that the fact of extending the duration of this plateau does not have any harmful consequences with regard to compliance with the mechanical qualities of the product treated.
- the temperature of the enclosure is gradually raised, during a phase C 1 , with a temperature rise speed close to the previous rise speed, from the glass transition temperature T g from 170 ° C up to the retification temperature T r from 230 ° C and the oven temperature is maintained for a second phase C 2 at this plateau value, until a high proportion of hemicellulose is broken down.
- FIG. 2 shows a graph consisting of two series of curves which have been superimposed.
- a first curve (reference I) represents the variation ⁇ m / ⁇ t of the mass loss ⁇ m of the treated wood as a function of time, during the complete retification process.
- a second series of curves represents the variation of absorbance A as a function of time, in the infrared domain, during the same treatment process, characteristic of the release of three gases from the decomposition of hemicellulose, namely acetic acid (curve II a ), carbon dioxide (curve II b ) and carbon monoxide (curve II c ).
- the quantity of one or more of the gases produced by the decomposition of the hemicellulose is monitored, in order to detect the instant t a which corresponds to the moment when there is no longer any decomposition of the hemicellulose. and which therefore indicates that the crosslinking reaction is complete.
- This monitoring can be carried out by means of known type sensors which, on the one hand, are able to detect specific gases produced by the decomposition of hemicellulose, especially acid acetic, carbon dioxide, or carbon monoxide and, on the other hand, are able to withstand processing temperatures.
- We can also use jointly several sensors which are specifically each sensitive to one of the gases and whose signals are processed by electronic means, so as to achieve a possibly weighted average of the measurements performed by each sensor.
- We can preferentially use a sensor sensitive to both three gases above which simplifies signal processing provided.
- One can of course also appeal, for carry out monitoring, at a measurement chain gas analysis, in particular by spectrography infrared.
- the Applicant has established that a certain type of sensors is particularly interesting to put in implements the treatment method according to the invention.
- the sensors of this type have a sensitive element which consists of a metal oxide, and more particularly a metal oxide of the type allowing detection of reducing gases. We will thus retain everything particularly sensors whose sensitive element is made of tin dioxide. We can also use sensors whose sensitive element consists of titanium dioxide or zinc oxide.
- a processing operation will be described below. of captivating pieces of wood which is set work according to the invention, that is to say by controlling the end of the retification phase proper by the detection of when hemicellulose is destroyed in most of it.
- the whole treatment includes a stage of drying A which is itself followed by a step of glass transition B and a crosslinking step C which is controlled according to the invention with a sensor of the type of the one described above.
- the signal produced by the sensor at during the retification phase is a function of the nature of treated wood.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
Claims (8)
- Procédé de traitement du bois par chauffage, comportant au moins une étape dans laquelle on maintient le bois à traiter dans une enceinte de traitement à une température déterminée, de façon à détruire, au moins en partie, l'hémicellulose du bois, caractérisé en ce qu'il consiste à surveiller, tout au long de ladite étape, la quantité existante d'au moins l'un des gaz résultant de la décomposition de l'hémicellulose, et à interrompre cette étape de traitement dès que cette quantité commence à atteindre une valeur sensiblement constante.
- Procédé suivant la revendication 1 caractérisé en ce que ledit gaz est de l'acide acétique et/ou du dioxyde de carbone et/ou de l'oxyde de carbone.
- Procédé suivant l'une des revendications précédentes caractérisé en ce que l'on détecte lesdites quantités de gaz au moyen d'un capteur sensible à l'un au moins desdits gaz, qui est disposé dans l'enceinte de traitement.
- Procédé selon la revendication 1 ou 2, caractérisé en ce que l'on détecte la quantité desdits gaz au moyen d'un élément détecteur constitué un oxide métallique.
- Procédé suivant la revendication 4, caractérisé en ce que l'oxyde métallique est SnO2, TiO2 ou ZnO.
- Procédé selon la revendication 1 ou 2, caractérisé en ce que l'on détecte les quantités d'au moins un desdits gaz par une chaíne de mesure d'analyse par spectrographie infrarouge.
- Procédé selon la revendication 1, caractérisé en ce que l'on amène et maintient le bois entre 220°C et 300°C dans une enceinte par chauffage et en arrêtant le chauffage lorsque l'on détecte que le signal de sortie d'un capteur d'au moins un des gaz atteint une valeur sensiblement constante et éventuellement commence à décroítre.
- Procédé suivant la revendication 7, caractérisé en ce que la température déterminée dans l'enceinte est de 230°C.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9609456A FR2751580B1 (fr) | 1996-07-26 | 1996-07-26 | Procede de retification du bois |
FR9609456 | 1996-07-26 | ||
PCT/FR1997/001396 WO1998004393A1 (fr) | 1996-07-26 | 1997-07-25 | Procede de retification du bois |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0854776A1 EP0854776A1 (fr) | 1998-07-29 |
EP0854776B1 true EP0854776B1 (fr) | 2004-05-12 |
Family
ID=9494534
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97935631A Expired - Lifetime EP0854776B1 (fr) | 1996-07-26 | 1997-07-25 | Procede de retification du bois |
Country Status (8)
Country | Link |
---|---|
US (1) | US5901463A (fr) |
EP (1) | EP0854776B1 (fr) |
JP (1) | JPH11512987A (fr) |
AT (1) | ATE266509T1 (fr) |
CA (1) | CA2232974C (fr) |
DE (1) | DE69729061D1 (fr) |
FR (1) | FR2751580B1 (fr) |
WO (1) | WO1998004393A1 (fr) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2781180B1 (fr) | 1998-07-17 | 2000-09-29 | Fours Et Bruleurs Rey | Reacteur de retification du bois |
FR2804629A1 (fr) * | 2000-01-21 | 2001-08-10 | D Abadie Humberto Roque Carril | Bois allege obtenue par traitement des bois de bombaces |
BR0006399B1 (pt) | 2000-12-20 | 2010-06-15 | processo de secagem acelerada de madeira baseado nas suas propriedades reológicas. | |
US7537619B2 (en) | 2004-04-08 | 2009-05-26 | Félix Huard Inc. | Method and system for the treatment of betula wood |
FR2871181B1 (fr) | 2004-06-02 | 2006-09-08 | Epmb H Soc Par Actions Simplif | Systeme de construction modulaire |
US7963048B2 (en) * | 2005-05-23 | 2011-06-21 | Pollard Levi A | Dual path kiln |
US8201501B2 (en) | 2009-09-04 | 2012-06-19 | Tinsley Douglas M | Dual path kiln improvement |
DE102009047137A1 (de) | 2009-11-25 | 2011-05-26 | Institut Für Holztechnologie Dresden Gemeinnützige Gmbh | Verfahren zur thermischen Modifizierung oder Vergütung von Holz und Holzprodukten |
JP5843394B2 (ja) * | 2012-02-29 | 2016-01-13 | 第一高周波工業株式会社 | リグノセルロース系材料の処理方法および処理装置 |
US10619921B2 (en) | 2018-01-29 | 2020-04-14 | Norev Dpk, Llc | Dual path kiln and method of operating a dual path kiln to continuously dry lumber |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2916677A1 (de) * | 1979-04-25 | 1980-11-06 | Ruetgerswerke Ag | Verfahren zur verguetung von holz |
FR2604942B1 (fr) * | 1986-10-10 | 1988-12-23 | Armines | Procede de fabrication d'un materiau ligno-cellulosique par traitement thermique et materiau obtenu par ce procede |
US5169687A (en) * | 1988-09-16 | 1992-12-08 | University Of South Florida | Supercritical fluid-aided treatment of porous materials |
JPH03111749A (ja) * | 1989-09-26 | 1991-05-13 | Mitsui Petrochem Ind Ltd | 炭酸ガス検知材料 |
ES2091087T3 (es) * | 1993-04-29 | 1996-10-16 | Shell Int Research | Procedimiento para mejorar la calidad de madera de baja calidad. |
FR2720969A1 (fr) * | 1994-06-14 | 1995-12-15 | Herve Montornes | Procédé de traitement haute température d'un matériau ligno-cellulosique. |
-
1996
- 1996-07-26 FR FR9609456A patent/FR2751580B1/fr not_active Expired - Fee Related
-
1997
- 1997-07-25 JP JP10508558A patent/JPH11512987A/ja active Pending
- 1997-07-25 AT AT97935631T patent/ATE266509T1/de not_active IP Right Cessation
- 1997-07-25 EP EP97935631A patent/EP0854776B1/fr not_active Expired - Lifetime
- 1997-07-25 US US09/043,474 patent/US5901463A/en not_active Expired - Fee Related
- 1997-07-25 WO PCT/FR1997/001396 patent/WO1998004393A1/fr active IP Right Grant
- 1997-07-25 CA CA002232974A patent/CA2232974C/fr not_active Expired - Fee Related
- 1997-07-25 DE DE69729061T patent/DE69729061D1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
WO1998004393A1 (fr) | 1998-02-05 |
CA2232974C (fr) | 2006-01-24 |
US5901463A (en) | 1999-05-11 |
JPH11512987A (ja) | 1999-11-09 |
FR2751580A1 (fr) | 1998-01-30 |
FR2751580B1 (fr) | 1998-10-16 |
ATE266509T1 (de) | 2004-05-15 |
EP0854776A1 (fr) | 1998-07-29 |
CA2232974A1 (fr) | 1998-02-05 |
DE69729061D1 (de) | 2004-06-17 |
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