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EP1646483A1 - Procede pour introduire de la cire dans du bois thermique - Google Patents

Procede pour introduire de la cire dans du bois thermique

Info

Publication number
EP1646483A1
EP1646483A1 EP04738887A EP04738887A EP1646483A1 EP 1646483 A1 EP1646483 A1 EP 1646483A1 EP 04738887 A EP04738887 A EP 04738887A EP 04738887 A EP04738887 A EP 04738887A EP 1646483 A1 EP1646483 A1 EP 1646483A1
Authority
EP
European Patent Office
Prior art keywords
wax
thermowood
wood
impregnated
waxes
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Withdrawn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
EP04738887A
Other languages
German (de)
English (en)
Inventor
Hans-Joachim Burger
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.)
Frohner Juergen
Froner Reinhard
Gut Marcus
Original Assignee
Frohner Juergen
Froner Reinhard
Gut Marcus
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 Frohner Juergen, Froner Reinhard, Gut Marcus filed Critical Frohner Juergen
Publication of EP1646483A1 publication Critical patent/EP1646483A1/fr
Withdrawn legal-status Critical Current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
    • B27K3/36—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
    • B27K3/02—Processes; Apparatus
    • B27K3/0207—Pretreatment of wood before 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
    • B27K3/0207—Pretreatment of wood before impregnation
    • B27K3/0214—Drying
    • 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
    • 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

Definitions

  • the invention relates to a method for introducing wax into thermowood.
  • the invention is therefore based on the object of providing a simple method for impregnating wood which can be carried out with low process risks, and of presenting a wood with improved mechanical properties.
  • thermowood in which wax is first heated above its melting point, after which thermowood is introduced into the liquid wax.
  • the wax penetrates the thermal wood and impregnates it.
  • the use of hot wax as a soaking medium is simple and effective.
  • Thermowood is wood that can only be made weatherproof by intense heat.
  • thermowood There are various methods and process steps for the production of thermowood.
  • softwood was mainly used for this; the process has now also been extended to hardwood, for example beech.
  • a method is known in which the wood is heat-treated at about 200 ° C., preferably at about 215 ° C. or 240 ° C., for about 24 hours with the exclusion of oxygen and without the addition of chemicals.
  • thermowood process moisture and other volatile components are almost completely removed from the wood and its cell structure changes so that weather, moisture and fungi can no longer harm the wood.
  • This heat treatment makes the wood more resistant to the attack by wood pests and also to the weather.
  • the results outperform the treatment with chemical wood preservatives - and that naturally.
  • Thermowood swells and shrinks less than untreated wood, so it is less prone to changes in shape and size.
  • the wood has an equilibrium moisture content of approx. 8%.
  • the water content is thus greatly reduced, as is the content of resins and wood constituents, which are volatile at the above-mentioned temperature of 215 ° C.
  • thermowood The reasons for the increasing importance of so-called thermowood are:
  • thermowood is more brittle than before the heat treatment. There was no significant improvement in weather resistance.
  • the waxes that are used to impregnate the thermowood are preferably solid at room temperature. Their melting point is well above room temperature.
  • thermo wood can be easily impregnated with liquid wax. Due to the low water content, the liquid wax can penetrate well into the cavities of the wood and into the cell walls. After cooling, the wax remains in the wood. The wax-impregnated wood is easier to process mechanically and its compressive strength is better than before.
  • thermowood which has been treated with the method according to the invention is immediately ready for use. It no longer has to be subjected to complex and complicated drying processes. The risk of producing rejects is eliminated or is significantly reduced.
  • thermowood The quality of such wax impregnation of thermowood is far superior to all other impregnation processes, even with the simplest treatment in terms of long-term weather resistance, strength, water stability, workability, environmental compatibility and aesthetics. This can easily be explained in the basic material properties of waxes. There are shrines, death masks and other objects made of wax that have survived for centuries without significant losses.
  • thermowood Even impregnation with at least 10 percent by weight (weight) of atro wood shows significantly improved mechanical properties. It is preferred if at least 20% by weight of wax is introduced, particularly preferably at least 30% by weight.
  • Waxes which contain polyethylene or which consist of polyethylene have proven to be particularly suitable for carrying out the process according to the invention.
  • waxes can be melted without special precautions being taken. must, for example against the release of solvents.
  • Waxes made of polyethylene (PE waxes) penetrate wood well, they have a compressive strength that is of the same order of magnitude as wood. PE waxes are therefore well suited to improve the mechanical properties of thermowood. The PE waxes also do not weigh down the wood unnecessarily and they are uncomplicated to process, in particular machining, and to dispose of or recycle the thermowood.
  • "wood-hard" pure PE waxes should preferably be used, which have a melting point of approx. 130 ° C and which are low viscosity when heated to 200 ° C.
  • the waxes are inexpensive, the application is simple, it is done without toxic traces and the product is 100% recyclable.
  • An example of such a PE wax is the product "Luwax AH ®” from Tenside (BASF) or PE-Wax A112 from LEUNA Polymer GmbH.
  • melt points of suitable waxes are approx. 90 ° C to 120 ° C. According to a preferred embodiment of the method according to the invention, however, the wax is further heated to temperatures of at least 140 ° C., preferably at least 160 ° C., particularly preferably of at least 80 ° C. This ensures that the wax achieves the lowest possible viscosity, which is particularly suitable for penetration into thermowood. Heating beyond the melting point to the above-mentioned temperatures thus ensures that large amounts of wax can be introduced into the thermowood. At these temperatures, it is also ensured that the wax penetrates deep into the thermowood and impregnates all or almost the entire cross section of the thermowood.
  • the thermowood is heated when it is introduced into the liquid wax. It is particularly preferred if the thermowood is introduced into the liquid wax immediately after the heat treatment. Even a wood heated to at least 140 ° C considerably reduces the energy required to apply the wax. If the thermowood has a temperature of at least 160 ° C, preferably at least 180 ° C, this further optimizes the energy requirement for impregnation.
  • the liquid wax penetrates the thermowood relatively quickly.
  • a dwell time of at least 30 minutes in the liquid wax improves the mechanical properties of the thermowood considerably.
  • the dwell time can be increased to at least 60 minutes, preferably to at least 120 minutes.
  • the method according to the invention is therefore a relatively short exposure time in comparison to the treatment with thermowood.
  • thermowood The penetration of the wax into the thermowood is effectively supported if the wax is introduced into the thermowood using excess pressure. It has proven to be advantageous to apply a pressure of at least 5 bar in order to introduce the wax faster and deeper into the thermowood. According to a preferred further development of the method, at least 10 bar pressure is applied, particularly preferably at least 20 bar pressure. Higher pressures (up to or even over 150 bar) can be even more advantageous. If this embodiment of the method is chosen, then it makes sense to stack the thermowood in a heatable pressure vessel. If the liquid wax, which has grown to the desired pressure, is then introduced into the kettle via pressure lines, the wax can be introduced into the thermowood in a simple and inexpensive manner.
  • the invention also relates to a wax-impregnated thermowood in which at least 30% of the wood cross section of the thermowood is impregnated with wax. According to an advantageous embodiment of the invention, at least 50%, preferably at least 75%, of the wood cross section of the thermo wood is impregnated with wax.
  • the deep penetration of the thermo wood with wax ensures a significant improvement in the mechanical properties of the wood, especially the compressive strength.
  • thermowood At least in the unpressurized treatment of thermowood, the cooling contraction presumably results in microscopic pores which have the desired moisture absorption of e.g. B. allow condensation without causing swelling of the thermowood.
  • thermowood is the subject of the invention, the compressive strength of which is at least 5%, preferably at least 10% above the compressive strength of the natural wood used as the starting material and significantly above that of the non-impregnated thermowood.
  • the wax introduced into the thermowood can also be colored. This is particularly advantageous if the discoloration of the thermo wood does not satisfy the heat treatment.
  • the use of colored waxes is then simple and safe.
  • the color tones can be permanently corrected, especially by adding wax-soluble dyes to the drinking wax.
  • a spruce wood (thermo wood) with a cross section of 8 x 8 cm and a length of approx. 3 m is conveyed into a heatable pressure chamber and fixed after the heat treatment.
  • the pressure chamber is provided with a feed line and a discharge line for liquid wax.
  • PE wax is heated to 180 ° C and the heatable pressure chamber, which is also heated to 180 ° C, is flooded with the liquefied wax via the feed line with the application of pressure.
  • the pressure is 20 bar.
  • the wood temperature is still 165 ° C.
  • the chamber remains flooded for 45 minutes and is kept at a temperature of 180 ° C.
  • the wax is continuously circulated during the 45 minutes by connecting the supply and discharge lines and switching on a pump. After the 45 minutes have passed, the supply and discharge lines are decoupled and the liquid wax is pumped out of the pressure chamber. Pressure equalization is initiated and the chamber is opened after the equalizing pressure is reached.
  • the thermowood is examined after cooling. The treatment absorbed 25% by weight of wax based on dry wood. After cooling, the compressive strength is approx. 7% higher than the compressive strength of the untreated wood. When planing the wax-impregnated wood, the surface is smoother than when planing untreated thermowood.
  • the thermal wood treated according to the invention can still be glued well despite the wax content.
  • plywood, etc. can also be produced with wood that has already been treated with wax.
  • the wood can still be painted well.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Fats And Perfumes (AREA)

Abstract

L'invention concerne un procédé pour introduire de la cire dans du bois thermique, selon lequel la cire est portée à une température supérieure au point de fusion et le bois thermique est introduit dans la cire liquide. La présente invention porte également sur du bois thermique imprégné de cire lequel est imprégné de cire dans sa section transversale pour au moins 30 %, de préférence pour au moins 50 % et, mieux encore, pour au moins 75 %.
EP04738887A 2003-07-14 2004-07-08 Procede pour introduire de la cire dans du bois thermique Withdrawn EP1646483A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20310745U DE20310745U1 (de) 2003-07-14 2003-07-14 Wachsverfestigung von Thermoholz
PCT/DE2004/001471 WO2005007369A1 (fr) 2003-07-14 2004-07-08 Procede pour introduire de la cire dans du bois thermique

Publications (1)

Publication Number Publication Date
EP1646483A1 true EP1646483A1 (fr) 2006-04-19

Family

ID=28799254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04738887A Withdrawn EP1646483A1 (fr) 2003-07-14 2004-07-08 Procede pour introduire de la cire dans du bois thermique

Country Status (3)

Country Link
EP (1) EP1646483A1 (fr)
DE (2) DE20310745U1 (fr)
WO (1) WO2005007369A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005002096B3 (de) * 2005-01-14 2006-11-09 Carl-G. Berninghausen Imprägniermittel zur Imprägnierung von fertig getrocknetem und profiliertem Holz und Verwendung des Imprägniermittels
DE102006027934B4 (de) * 2006-06-14 2009-09-10 Owi Gmbh Verfahren zur Herstellung von witterungsbeständigem Holzfurnier sowie Holzfurnier
DE102007012353A1 (de) * 2007-03-14 2008-09-25 Siemens Ag Innenausbaukomponente aus Holz für ein Schienenfahrzeug
DE102011104025A1 (de) 2010-06-11 2011-12-15 Technische Universität Dresden Verfahren zur Modifizierung von Holz oder Holzwerkstoffen sowie chemisch und thermisch modifiziertes Holz
DE102012103795A1 (de) * 2012-04-30 2013-10-31 Jan Tomsky Akustisches Streichinstrument und Verfahren zum Herstellen eines akustischen Streichinstruments
WO2015095900A2 (fr) * 2013-12-17 2015-06-25 Rhino Modified Wood (Pty) Limited Processus de traitement de bois d'œuvre
WO2018090064A1 (fr) * 2016-11-11 2018-05-17 Rhino Modified Wood (Pty) Ltd Procédé de stratification

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3928677A (en) * 1972-12-08 1975-12-23 Firewood Inc Process of treating wood
JPS5628805A (en) * 1979-08-17 1981-03-23 Earth Chemical Co Vermin detesting wood and its manufacture
JPS5842411A (ja) * 1981-09-07 1983-03-11 大塚化学株式会社 木質材料の寸法安定化処理方法
JP3585492B2 (ja) * 1993-05-12 2004-11-04 ヴァルティオン テクニーリネン タットキムスケスクス セルロース製品の耐生分解特性および寸法安定性を向上させる方法
BR9708469A (pt) * 1996-04-01 1999-04-13 Markus Rettenbacher Corpos moldados de madeira impregnada
US6426118B2 (en) * 1998-06-17 2002-07-30 Coating Development Group, Inc. Method for pressure treating wood
FR2810917B1 (fr) * 2000-06-30 2002-09-20 Armines Ass Pour La Rech Et Le Procede d'impregnation a coeur de pieces de bois par traitement thermique en bains

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005007369A1 *

Also Published As

Publication number Publication date
DE112004001750D2 (de) 2006-06-01
WO2005007369A1 (fr) 2005-01-27
DE20310745U1 (de) 2003-10-02

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