EP1237687B1 - Impregnierungsverfahren - Google Patents

Impregnierungsverfahren Download PDF

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Publication number
EP1237687B1
EP1237687B1 EP00970374A EP00970374A EP1237687B1 EP 1237687 B1 EP1237687 B1 EP 1237687B1 EP 00970374 A EP00970374 A EP 00970374A EP 00970374 A EP00970374 A EP 00970374A EP 1237687 B1 EP1237687 B1 EP 1237687B1
Authority
EP
European Patent Office
Prior art keywords
autoclave
linseed oil
product
oil
temperature
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
Application number
EP00970374A
Other languages
English (en)
French (fr)
Other versions
EP1237687A1 (de
Inventor
Mikkel Erk-Ers Selder
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.)
Linotech AB
Original Assignee
JAERLASA FAERGINDUSTRIER AB
Jarl SA Fargindustrier AB
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 JAERLASA FAERGINDUSTRIER AB, Jarl SA Fargindustrier AB filed Critical JAERLASA FAERGINDUSTRIER AB
Publication of EP1237687A1 publication Critical patent/EP1237687A1/de
Application granted granted Critical
Publication of EP1237687B1 publication Critical patent/EP1237687B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • B27K3/34—Organic impregnating agents
    • B27K3/44—Tar; Mineral oil
    • B27K3/48—Mineral oil
    • 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
    • B27K3/0278—Processes; Apparatus involving an additional treatment during or after impregnation
    • 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
    • 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
    • B27K5/001—Heating

Definitions

  • the present invention relates to a process for linseed oil impregnation of a product based on cellulose, particularly wood, such as lumber, other wood products and the like.
  • the process involves treatment of the product with linseed oil at an increased temperature under pressure in an autoclave.
  • impregnation processes for the protection of wood are known, and these methods can in principle be divided up into techniques based on the supply of a substance poisonous to the growth of the micro-organisms, and techniques whereby the wood is given hydrophobic properties, for example by impregnation with some kind of oil.
  • an impregnation agent is crude linseed oil which can be of hot- or cold-pressed type, both of which by suitable heat treatment are converted into boiled linseed oils.
  • the present invention has for an object to provide a process for linseed oil impregnation of cellulose-based products, particularly wood, the new process resulting in a substantially improved protective effect, especially in view of the fact that the process enables a higher level of uptake.
  • Another object of the invention is to provide a multi-step process utilizing an initial heating step in which water in the form of vapour and enclosed air is released from the product, and a subsequent step where the result of the water and air release is used to improve the uptake of oil.
  • Yet an object of the invention is to provide a process with alternate use of vacuum in combination with high temperature and then cooling in combination with over-pressure.
  • a particular object of the invention is to make certain in the process that the transition from the vacuum-heating step to the pressure-cooling step takes place continuously so that maximum benefit of this transition will be obtained.
  • the invention provides for a process for the impregnation of cellulose-based products, particularly wood, with linseed oil, the products being treated with linseed oil at an increased temperature and under pressure in an autoclave.
  • the invention is characterized by the following steps:
  • the process according to the present invention is in principle based on the new concept that the switching over of the autoclave from hot linseed oil under vacuum takes place continuously by introducing cold linseed oil simultaneously with decharging the hot linseed oil from the autoclave, the autoclave being progressively put under overpressure.
  • the vacuum in the product generated under heat and autoclaved vacuum is utilized at a maximum so that optimal uptake of linseed oil takes place in connection with the supply of cold linseed oil and putting the autoclave under overpressure.
  • hot linseed oil and “cold linseed oil” thus mean that the temperature of the oil in the first case exceeds the boiling point of water and in the latter case is lower than the boiling point of water, respectively.
  • step b) it is suitable to heat the linseed oil to a temperature of about 140-180°C, whereas in the latter step d) it is preferred to put the autoclave under over-pressure of up to about 15 bar, for example from about 5 to about 12 bar.
  • the temperature of the cold linseed oil is suitably maintained within the range about +75 to about +85°C.
  • a processed linseed oil substantially consisting of linolenic acid, linolic acid and oleic acid, mainly in the form of triglycerides, the content of free tocoferol of the linseed oil being less than about 100 ppm.
  • the linseed oil content of free tocoferol is suitably less than about 75 ppm and particularly less than about 50 ppm.
  • the process may in a further final step be dried in an air flow of environmental temperature.
  • An autoclave is charged with lumber to be treated, in the present case rods which have been distributed and anchored.
  • the autoclave is charged with linseed oil heated to a temperature within the range about 140 to about 180°C, for example about 160°C, and the autoclave is charged so that the lumber is completely surrounded by linseed oil.
  • the temperature is maintained at a constant level while the autoclave is put under vacuum. In view of the high temperature to which the lumber is heated and under the influence of vacuum the water will evaporize and water steam together with air will leave the pore system of the lumber.
  • the hot oil is continuously replaced with cold oil by pumping the hot oil out of the autoclave at the same time pumping cold oil into the autoclave at the bottom thereof.
  • the pressure in the autoclave is progressively increased from vacuum to an overpressure of about 10 bar.
  • the temperature of the cold oil is maintained within the range about +75 to about +85°C.
  • a sub-pressure is created in the pore system thereof, whereby impregnating oil more easily impregnates the lumber so as to increase the level of uptake.
  • the lumber is allowed to dry in a cool flow of air at a temperature of about 20°C or lower, whereby excess of oil further penetrates into the lumber.
  • This final step has for a function to prevent that oil by later sweating emerges from the impregnated lumber.
  • the lumber made subject to impregnation can be of any type. In Sweden the trend is presently towards the common coniferous trees, namely fir and pine.
  • the lumber can be fresh or dried in different degrees, i.e. contain different amounts of moisture.
  • the time periods of the different process steps will have to be adapted to the parameters of the lumber (dimension, moisture content, type of wood, core and/or sap-wood) and to the uptake level desired.
  • the uptake level can be given in quantity of linseed oil per cubic meter or percent of the dry density of the lumber which is about 450 kg/m 3 , and further with regard to the intended use of the impregnated lumber. The higher the uptake level obtained the better resistance of the lumber and the harder conditions endured by lumber in its practical use.
  • Type of lumber (density 450 kg/m 3 ) Approximate uptake level % About kg/m 3 Pine sap 100% 450 kg/m 3 Pine core 40% 180 kg/m 3 Fir sap 40% 180 kg/m 3 Fir core 20% 90 kg/m 3
  • Lumber impregnated to high levels of uptake i.e. up to 100%, can according to ongoing tests endure long periods of time under quite severe conditions, i.e. freely outdoors in ground or in ground contact.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Glass Compositions (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Claims (9)

  1. Verfahren zum Imprägnieren von Produkten auf Cellulosebasis, insbesondere von Holz, bei dem das Produkt mit Leinöl bei erhöhter Temperatur unter Druck in einem Autoklaven behandelt wird, wobei das Verfahren die Stufen umfasst:
    a) Einführen des zu behandelnden Produkts in einen Autoklaven,
    b) Einführen von Leinöl, das auf eine Temperatur erhitzt ist, die den Siedepunkt von Wasser übersteigt, in den Autoklaven, sodass das Produkt von Leinöl umgeben ist,
    c) Anlegen eines Vakuums an den Autoklaven, während die Temperatur konstant gehalten wird, wobei Wasser in Form von Wasserdampf und Luft, die in dem Produkt eingeschlossen ist, aus dem Produkt freigesetzt werden,
    d) Austragen des Leinöls aus dem Autoklaven unter gleichzeitiger Zufuhr von Leinöl mit einer Temperatur unterhalb des Siedepunkts von Wasser und vorzugsweise unter Anlegen eines Überdrucks an den Autoklaven und
    e) Austragen des kalten Öls aus dem Autoklaven, der gegebenenfalls zur Entfernung von überschüssigem Öl aus dem Produkt erneut unter Vakuum gesetzt wird, wonach das imprägnierte Produkt aus dem Autoklaven entnommen wird.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass in der Stufe (b) das Leinöl auf eine Temperatur von etwa 140 bis 180 °C erhitzt wird.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass in der Stufe (d) der Autoklav unter einen Überdruck von bis zu etwa 15 bar gesetzt wird.
  4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass in der Stufe (d) die Temperatur des kalten Leinöls innerhalb des Bereiches von etwa 75 bis 85 °C gehalten wird.
  5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass in der Stufe (d) der Überdruck etwa 5 bis etwa 12 bar beträgt.
  6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Imprägnierung mit einem behandelten Leinöl durchgeführt wird, das im Wesentlichen aus Linolensäure, Linolsäure und Ölsäure, hauptsächlich in Form der Triglyceride, besteht, wobei der Gehalt des Öls an freiem Tocopherol weniger als etwa 100 ppm beträgt.
  7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass der Gehalt des Leinöls an freiem Tocopherol weniger als etwa 75 ppm beträgt.
  8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass der Gehalt des Leinöls an freiem Tocopherol weniger als etwa 50 ppm beträgt.
  9. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Produkt in einer weiteren Schlussstufe in einem Luftstrom von Umgebungstemperatur getrocknet wird.
EP00970374A 1999-10-07 2000-09-26 Impregnierungsverfahren Expired - Lifetime EP1237687B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9903622 1999-10-07
SE9903622A SE516982C2 (sv) 1999-10-07 1999-10-07 Förfarande för linoljeimpregnering av cellulosabaserade produkter
PCT/SE2000/001863 WO2001024982A1 (en) 1999-10-07 2000-09-26 Method of impregnation

Publications (2)

Publication Number Publication Date
EP1237687A1 EP1237687A1 (de) 2002-09-11
EP1237687B1 true EP1237687B1 (de) 2003-06-18

Family

ID=20417282

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00970374A Expired - Lifetime EP1237687B1 (de) 1999-10-07 2000-09-26 Impregnierungsverfahren

Country Status (18)

Country Link
EP (1) EP1237687B1 (de)
JP (1) JP2003511258A (de)
CN (1) CN1158169C (de)
AT (1) ATE243096T1 (de)
AU (1) AU754796C (de)
CA (1) CA2386503A1 (de)
CZ (1) CZ297778B6 (de)
DE (1) DE60003460T2 (de)
DK (1) DK1237687T3 (de)
EE (1) EE05058B1 (de)
HU (1) HUP0204152A2 (de)
MX (1) MXPA02003442A (de)
NO (1) NO321255B1 (de)
NZ (1) NZ518171A (de)
PL (1) PL191345B1 (de)
SE (1) SE516982C2 (de)
SK (1) SK4402002A3 (de)
WO (1) WO2001024982A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2003903242A0 (en) * 2003-06-25 2003-07-10 The University Of Melbourne Process for the treatment of wood
NZ531217A (en) * 2004-02-18 2005-12-23 Nz Forest Research Inst Ltd Impregnation process
FR2927564B1 (fr) * 2008-02-14 2012-01-13 Ct Valorisation Ind Agro Ressources Procede de traitement du bois par des agents d'origine naturelle
CN101239477B (zh) * 2008-02-26 2012-05-23 侯梦斌 一种木材改性过程中回收抽提物质的方法
CN105171888B (zh) * 2015-09-17 2017-10-10 浙江永裕竹业股份有限公司 一种重组竹型材的制备方法
CN113246246B (zh) * 2021-06-17 2022-07-01 北京林业大学 一种小径材液相干燥-热处理的方法
EP4547455A1 (de) * 2022-06-29 2025-05-07 WTT Innovation ApS Hybride hochdruckholzmodifizierung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3968276A (en) * 1972-10-25 1976-07-06 Diversified Wood Products, Inc. Process for the preservation of wood
DK172239B1 (da) * 1991-05-07 1998-02-02 Ulrich Schirnig Fremgangsmåde til kvalitetsforbedring, såsom forbedret konservering, af træemner ved imprægnering af disse
HU9203611D0 (en) * 1992-11-18 1993-04-28 Pal Csecsei Method for impregnating or simultaneous impregnating and drying of wood
US5652023A (en) * 1996-02-29 1997-07-29 Chemical Specialties, Inc. Fixation process for heat-fixable preservative treated wood
DE19715664A1 (de) * 1997-04-16 1998-10-22 Butzbacher Weichenbau Gmbh Verfahren zum Imprägnieren von Festkörpern

Also Published As

Publication number Publication date
ATE243096T1 (de) 2003-07-15
CZ20021109A3 (cs) 2003-01-15
DE60003460T2 (de) 2004-03-18
PL191345B1 (pl) 2006-05-31
AU754796C (en) 2003-06-26
WO2001024982A1 (en) 2001-04-12
SE9903622L (sv) 2001-04-08
NO321255B1 (no) 2006-04-10
NZ518171A (en) 2003-09-26
PL354288A1 (en) 2003-12-29
AU754796B2 (en) 2002-11-28
NO20021635L (no) 2002-06-05
SE9903622D0 (sv) 1999-10-07
MXPA02003442A (es) 2004-09-10
CN1377307A (zh) 2002-10-30
NO20021635D0 (no) 2002-04-05
SE516982C2 (sv) 2002-04-02
EE05058B1 (et) 2008-08-15
HUP0204152A2 (en) 2003-03-28
SK4402002A3 (en) 2002-10-08
CZ297778B6 (cs) 2007-03-28
AU7976600A (en) 2001-05-10
DE60003460D1 (de) 2003-07-24
CA2386503A1 (en) 2001-04-12
CN1158169C (zh) 2004-07-21
DK1237687T3 (da) 2003-08-25
EP1237687A1 (de) 2002-09-11
JP2003511258A (ja) 2003-03-25
EE200200179A (et) 2003-04-15

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