[go: up one dir, main page]

WO2008012757A1 - Procédé d'imprégnation du bois - Google Patents

Procédé d'imprégnation du bois Download PDF

Info

Publication number
WO2008012757A1
WO2008012757A1 PCT/IB2007/052921 IB2007052921W WO2008012757A1 WO 2008012757 A1 WO2008012757 A1 WO 2008012757A1 IB 2007052921 W IB2007052921 W IB 2007052921W WO 2008012757 A1 WO2008012757 A1 WO 2008012757A1
Authority
WO
WIPO (PCT)
Prior art keywords
wood
autoclave
treatment
treated
impregnation
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/IB2007/052921
Other languages
English (en)
Inventor
Fausto Togni
Renato Togni
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP07805209A priority Critical patent/EP2091704A1/fr
Publication of WO2008012757A1 publication Critical patent/WO2008012757A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • B27K3/02—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
    • B27K5/04—Combined bleaching or impregnating and drying of wood

Definitions

  • the present invention relates to a method of impregnation of wood, in particular the wood of broadleaf trees such as chestnut, oak, ash, beech, elm, poplar and walnut, as well as to a process for the preparation of semi-finished and finished products made of wood comprising said method. Furthermore, the present invention relates to articles made of wood obtained with said method and process, where by the term “articles" are meant both semifinished products and finished products.
  • the wood is thus normally treated with appropriate chemical substances designed to provide specific protection against one or more of the aforesaid atmospheric and biological agents.
  • Said treatment can be carried out using technologies of a traditional type, for example by dipping or by means of application of said chemical substances with a brush or by spraying.
  • Such treatment is not able to provide simultaneously satisfactory protection in terms of resistance to fungi and insects, water-repellence, and resistance to UV light.
  • Treatment by impregnation of the finished product involves, however, a deterioration of the quality of the finish, given that the vacuum-pressure-vacuum cycle necessarily determines non-uniform movements in the wood on account of the non- structural uniformity of wood itself.
  • the main task of the present invention is to provide a method of impregnation of wood, in particular wood of broadleaf trees, such as chestnut, oak, ash, beech, elm, poplar, and walnut, which will enable the drawbacks referred to above to be overcome.
  • a further task of the present invention is to provide a process for the preparation of semi-finished and finished products made of wood that will enable the drawbacks referred to above to be overcome.
  • a purpose of the present invention is to provide a method of treatment of wood by means of impregnation that will enable an increase in the useful service life of the articles made using wood subjected to said treatment.
  • a further purpose of the present invention is to provide a method of treatment of wood by means of impregnation that will enable articles characterized by a high degree of impregnation to be obtained also throughout their bulk and not only on the external surfaces.
  • Yet a further purpose of the present invention is to provide a method of treatment of wood by means of impregnation that will enable simplification of the cycle of processing of wood.
  • Another purpose of the present invention is to provide a method of treatment of wood by means of impregnation that will enable the use of a plurality of substances for said treatment.
  • the above task are achieved according to the invention through a method of treatment of wood by means of impregnation in an autoclave, characterized in that the wood to be treated is a wood of broadleafed trees chosen from among chestnut, oak, ash, beech, elm, poplar, and walnut; moreover, said wood is characterized by a content of relative humidity higher than 15%.
  • the method of treatment of wood by means of impregnation in an autoclave according to the invention is characterized in that, contrary to what occurs normally, the wood to be treated is chosen from among woods of broadleafed trees, usually considered as not impregnable, having a particular content of humidity. It has in fact surprisingly been found that, working for example with ash that has dried naturally (and hence with a content of humidity comprised between 20% and 22%), it is possible to obtain articles with practically uniform impregnation throughout the entire section of the article itself.
  • the method according to the invention relates to the treatment of a wood of broadleafed trees chosen from among chestnut, oak, ash, beech, elm, poplar, and walnut.
  • a wood of broadleafed trees chosen from among chestnut, oak, ash, beech, elm, poplar, and walnut.
  • ash is by far the one preferred.
  • ash presents mechanical characteristics equal or superior to those of oak, and by far superior to those of the wood of conifers, such as Scotch pine and Monterey pine.
  • the wood of oak it has the considerable advantage of not containing tannins, which, as is known, when they are released from the wood, create problems of undesirable stains.
  • the method of treatment can be conveniently carried out in plants of a known type, for example the impregnation plants IMP-VP, produced by the firm I.S.V.E. s.r.l., which comprise: an autoclave that is able to withstand a vacuum as high as -700 mmHg and a pressure of 12 atm; a bath for containing the impregnating solution or, alternatively, a cistern for containing said solution; a bath or cistern for preparation of the impregnating solution; a vacuum pump; and a high-pressure pump.
  • plants of a known type for example the impregnation plants IMP-VP, produced by the firm I.S.V.E. s.r.l., which comprise: an autoclave that is able to withstand a vacuum as high as -700 mmHg and a pressure of 12 atm; a bath for containing the impregnating solution or, alternatively, a cistern for containing said solution;
  • the method according to the invention is highly flexible and enables impregnation of the wood with any substance, according to the needs.
  • the treating substances can in fact be protective substances both against atmospheric agents and against biological agents, or else fire-proof substances, or else wood-dyeing substances, or any mixtures thereof.
  • the method according to the invention does not present particular limitations as regards the solvent for the impregnating solution, which can be water or else an organic solvent, according to the needs.
  • the method of treatment according to the invention preferably comprises the following ones: introducing the wood to be treated into an autoclave; connecting the internal volume of the autoclave to a vacuum pump and creating a desired value of vacuum within said autoclave; the period of maintenance of the vacuum varies according to the needs and may for example be comprised between 30 and 90 minutes; introducing into the autoclave the solution that contains one or more treatment substances; connecting the internal volume of the autoclave to a high-pressure pump and pressurizing the inside of the autoclave itself; also in this case, the period of operation of the pressure pump varies according to the needs and may for example range between 30 and 180 minutes; discharging said solution from said autoclave, for example through a discharge valve positioned on the bottom of the autoclave; connecting the internal volume of said autoclave again to a vacuum pump and creating a desired value of vacuum within said autoclave; the period of maintenance of the vacuum varies according to the needs and may for example range between 20 and 40 minutes; bringing the autoclav
  • the method according to the invention enables very high levels of impregnation to be obtained, in particular with ash, given that it is possible in practice to achieve a substantially uniform impregnation throughout the section of the piece. This fact enables radical modifications to be made also in the processing of wood as compared to current practice.
  • the impregnation of the finished product reduces the level of quality of the finish in so far as the wood, and in particular its external surface, is exposed to the alternate action of vacuum and pressure in the presence of liquids, which inevitably modifies the characteristics thereof.
  • the expulsion of knots in areas corresponding to the surface is a phenomenon that frequently occurs and is certainly favoured by the vacuum-pressure- vacuum cycle mentioned above.
  • the present invention hence relates also to a process for wood processing and for preparing articles made of wood, which is characterized in that it comprises the following steps: prearranging the wood in the form of semi-finished articles; treating the wood by means of impregnation in an autoclave using the method of treatment by impregnation described previously; subjecting the treated wood to a process of drying; subjecting the dried wood to one or more processing operations for making articles in the form of finished pieces.
  • the treated wood can be cut, sawn, shaped, or in any way processed according to the needs, without having exposed surfaces that have remained untreated.
  • the level of finish is the one desired and imparted by the processes to which the piece is subjected, without there being the typical alterations that are encountered with methods of a known type.
  • the content of relative humidity of wood it is possible to make reference to the standards and equipment normally used in the sector, for example the method UNI9091-2/87.
  • the autoclave was pressurized at a pressure of approximately 10-12 bar and kept in said conditions for approximately 1 h. After this period had elapsed, the solution was discharged through a discharge valve, and a vacuum was created in the autoclave. The vacuum was maintained for approximately 15 minutes, after which the autoclave was brought to room pressure, and the pieces treated were taken out.
  • the technical solutions adopted enable the pre-set tasks and purposes to be fully achieved.
  • the method according to the invention enables in-depth impregnation of the wood of broadleafed trees used.
  • the useful service life of the articles made using said wood is considerably increased, so much so that for said articles it would be possible to offer guarantees of duration of up to twenty years, as compared to the ten years usually accorded to articles made with the wood of conifers.
  • a further advantage derives from the possibility of using types of wood, namely the wood of broadleafed trees, for making articles for exteriors, whilst up to now the vast majority of such applications contemplated the use of the wood of conifers.
  • the method according to the invention enables implementation of a process of wood processing of an innovative type in so far as it enables introduction of the semi-finished product into an autoclave, treatment thereof with the impregnating substance, and, after drying, subjection to the processes of finishing. This leads to an improvement in the quality of the finish and a reduction in the times and in the processing cycles as compared to processes of a known type.

Landscapes

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

Abstract

L'objet de la présente invention a trait à une méthode de traitement du bois par imprégnation dans un autoclave. D'après l'invention, le bois devant être traité selon cette méthode est un bois issu d'arbres à feuilles larges tel le marronnier, le chêne, le hêtre, l'orme, le peuplier et le noyer, et son humidité relative est supérieure à 15%.
PCT/IB2007/052921 2006-07-25 2007-07-23 Procédé d'imprégnation du bois Ceased WO2008012757A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07805209A EP2091704A1 (fr) 2006-07-25 2007-07-23 Procédé d'imprégnation du bois

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBG2006A000038 2006-07-25
ITBG20060038 ITBG20060038A1 (it) 2006-07-25 2006-07-25 Metodo di impregnazione del legno

Publications (1)

Publication Number Publication Date
WO2008012757A1 true WO2008012757A1 (fr) 2008-01-31

Family

ID=38686669

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/052921 Ceased WO2008012757A1 (fr) 2006-07-25 2007-07-23 Procédé d'imprégnation du bois

Country Status (3)

Country Link
EP (1) EP2091704A1 (fr)
IT (1) ITBG20060038A1 (fr)
WO (1) WO2008012757A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9640314B2 (en) 2010-04-07 2017-05-02 Abb Schweiz Ag Outdoor dry-type transformer
WO2020214040A1 (fr) * 2019-04-19 2020-10-22 Euro Logistics Group Sp. Z O.O. Procédé d'imprégnation du bois de pin

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190815556A (en) * 1908-07-22 1909-03-18 Johann Polifka Improvements in or relating to the Impregnation of Wood
US3968276A (en) * 1972-10-25 1976-07-06 Diversified Wood Products, Inc. Process for the preservation of wood
GB1469750A (en) * 1973-04-26 1977-04-06 Fosroc Ag Process of treating timber and the treated product
WO2003037532A1 (fr) * 2001-10-29 2003-05-08 Tarren Wood Products, Inc. Procede et composition utilises dans le traitement du bois

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004037044A1 (de) * 2004-07-29 2006-03-23 Degussa Ag Mittel zur Ausstattung von auf Cellulose und/oder Stärke basierenden Substraten mit Wasser abweisenden und gleichzeitig pilz-, bakterien-, insekten- sowie algenwidrigen Eigenschaften

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190815556A (en) * 1908-07-22 1909-03-18 Johann Polifka Improvements in or relating to the Impregnation of Wood
US3968276A (en) * 1972-10-25 1976-07-06 Diversified Wood Products, Inc. Process for the preservation of wood
GB1469750A (en) * 1973-04-26 1977-04-06 Fosroc Ag Process of treating timber and the treated product
WO2003037532A1 (fr) * 2001-10-29 2003-05-08 Tarren Wood Products, Inc. Procede et composition utilises dans le traitement du bois

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2091704A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9640314B2 (en) 2010-04-07 2017-05-02 Abb Schweiz Ag Outdoor dry-type transformer
WO2020214040A1 (fr) * 2019-04-19 2020-10-22 Euro Logistics Group Sp. Z O.O. Procédé d'imprégnation du bois de pin

Also Published As

Publication number Publication date
ITBG20060038A1 (it) 2008-01-26
EP2091704A1 (fr) 2009-08-26

Similar Documents

Publication Publication Date Title
EP2033520A1 (fr) Utilisation de compositions biocides pour la conservation du bois
US6217939B1 (en) Wood treatment process
JP6324723B2 (ja) 木材腐朽性担子菌に対する木材防腐剤としてのペンフルフェン
WO2008012757A1 (fr) Procédé d'imprégnation du bois
US6573298B2 (en) Method for protecting wood and wooden articles from fungal infection
Kamdem Fungal decay resistance of aspen blocks treated with heartwood extracts
US11376758B2 (en) Treatment of wooden materials
Jingpeng et al. Wood decay performance of strobilurins preservatives
CN107471364A (zh) 一种防虫胶合板的制备方法
US9878464B1 (en) Preservation of cellulosic materials, compositions and methods thereof
JPH04307204A (ja) 木材加工剤、加工木材及びその加工方法
Muin et al. Biological performance of wood-based composites treated with a formulation of 3-iodo-2-propynyl butylcarbamate and silafluofen using supercritical carbon dioxide
AU2012101047A4 (en) Treatment of radiata pine
Ganguly et al. Study on effect of microwave treatment on wood permeability and preservative retention in imported timber
JP4235966B2 (ja) 木材及び木質材料用の防腐防虫剤
EP1681145B1 (fr) Procédé et composition pour l'amélioration de la prise et la distribution de compositions de trempage en bois
JPS60248312A (ja) 木質材料処理方法
US20050283992A1 (en) Process for producing garden furniture from locust wood
JP6948137B2 (ja) 難燃性を有する木質材料の製造方法
WO2006117159A1 (fr) Compositions aqueuses durcissables pour l'impregnation de materiaux lignocellulosiques
Saputra et al. Improving the physical properties of young teak wood through phenol formaldehyde compregnation
Schmidt et al. Effects of two fumigants and a fungicide formulation on the development of kiln brown stain in radiata pine lumber
DE102006019819A1 (de) Wässrige, härtbare Zusammensetzungen zum Imprägnieren von Lignocellulosematerialien
Findlay Preservative methods
EA041144B1 (ru) Обработка древесных материалов

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07805209

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

NENP Non-entry into the national phase

Ref country code: RU

WWE Wipo information: entry into national phase

Ref document number: 2007805209

Country of ref document: EP