WO2006051155A1 - Method and apparatus for the protection of timber - Google Patents

Method and apparatus for the protection of timber Download PDF

Info

Publication number
WO2006051155A1
WO2006051155A1 PCT/FI2005/000479 FI2005000479W WO2006051155A1 WO 2006051155 A1 WO2006051155 A1 WO 2006051155A1 FI 2005000479 W FI2005000479 W FI 2005000479W WO 2006051155 A1 WO2006051155 A1 WO 2006051155A1
Authority
WO
WIPO (PCT)
Prior art keywords
wood treatment
timber
drying
chamber
wood
Prior art date
Application number
PCT/FI2005/000479
Other languages
French (fr)
Inventor
Heikki Sonninen
Original Assignee
Tekmawood Oy
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 Tekmawood Oy filed Critical Tekmawood Oy
Publication of WO2006051155A1 publication Critical patent/WO2006051155A1/en

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
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/04—Combined bleaching or impregnating and drying of wood
    • 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
    • B27K3/0228—Spraying apparatus, e.g. tunnels
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • 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 good
    • F26B2210/16—Wood, e.g. lumber, timber

Definitions

  • the present invention relates to a method and apparatus for the protection of timber via the use of a wood treatment material.
  • the timber is either im ⁇ mersed in a wood treatment liquid or pressure impregnated, which means hav ⁇ ing a wood treatment solution soaked into the timber / impregnating the timber with a wood treatment solution in conditions of under- or overpressure in a pressure chamber.
  • a wood treatment solution of this type is disclosed in Fl patent application 20011298.
  • This applica ⁇ tion describes an environmentally friendly wood treatment solution that does not contain any heavy metals and that contains an impregnating agent consisting of an alkali metal or alkaline earth metal salt of formic acid or propionic acid.
  • Such a salt can be used in an environmentally friendly manner as a wood preserva ⁇ tive to protect timber especially against decay and termites.
  • this ma ⁇ terial has excellent absorption properties, in other words, it soaks into wood faster than e.g. water.
  • the object of the present invention is to overcome the drawbacks of prior art and to achieve a new type of method and apparatus for the protection of timber.
  • the " method of the invention is based on the good absorption properties of new wood treatment materials. These properties are utilized to soak the material into the timber by spraying the material in the form of fine mist e.g. together with the final moistening water into the drying chamber by means of equipment intended for spreading of the moistening water after the drying and then circulating it in the chamber by means of fans.
  • the amount of liquid soaked into timber in connection with final moistening may give desired properties to the timber.
  • impregna ⁇ tion of timber can be performed in a drying plant in conjunction with a drying process, and no separate impregnation apparatus is needed.
  • FIG. 1 presents a simplified view of the drying chamber of a timber drying plant.
  • Fig. 1 represents the heat treatment apparatus of a timber drying plant for the drying of timber 1 , comprising a closeable chamber 2 where the timber 1 is ar ⁇ ranged in a stack with laths between layers.
  • the chamber 2 is provided with a heating unit 3 for heating the air and timber 1 in the chamber 2, a fresh air slide 4 for the supply of air into the chamber 2, an outlet slide 5 for passing the va- pors produced by the heating out of the chamber and a fan apparatus 6 pro ⁇ vided with an electric motor controlled by a frequency converter for enhancing air circulation in the chamber 2.
  • the apparatus comprises spraying nozzles 8 above the timber stack 1 for spraying final moistening water onto the bundle of timber.
  • the heating unit 3, the slides 4, 5, the spraying nozzles 8 and the fan apparatus 6 are controlled by a control unit 7.
  • the timber is heated to a temperature which is typically about 60 - 80 0 C or in a special hot drying process over 100 0 C in order to dry it (e.g. to a moisture of 10%).
  • the method of the invention is based on the good absorption properties of the wood treatment material. These properties are utilized to soak the material into the tLmber.by_spraying.t_he material [n . the form of fine mist together with the final moistening water into the drying chamber after the drying and circulating it in the chamber by means of fans.
  • the wood treatment solution contains an impregnating agent, which is an alkali metal or alkaline earth metal salt of formic acid or propionic acid.
  • the alkali metal or alkaline earth metal salt of formic acid or propionic acid may be sodium formate, potassium formate, calcium formate or magnesium formate, and especially potassium formate or calcium formate. It is also possible to use mixtures of the aforesaid salts.
  • the amount of alkali metal or alkaline earth metal salt of formic acid or propionic acid contained in the wood treatment solu ⁇ tion is e.g. 2-40 weight-%.

Landscapes

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

Abstract

A method and an apparatus for the protection of timber via the use of a wood treatment material, wherein the wood treatment material is a wood treatment solution which is mixed in a moistening liquid and spread together with it into a drying chamber in conjunction with and/or after a drying process.

Description

METHOD AND APPARATUS FOR THE PROTECTION OF TIMBER
The present invention relates to a method and apparatus for the protection of timber via the use of a wood treatment material.
At present, to protect timber e.g. against decay fungi, the timber is either im¬ mersed in a wood treatment liquid or pressure impregnated, which means hav¬ ing a wood treatment solution soaked into the timber / impregnating the timber with a wood treatment solution in conditions of under- or overpressure in a pressure chamber.
In pressure impregnation, at present mainly copper, zinc, chrome or arsenic salts or a mixture of these is used. However, the use of heavy metals like these is very dangerous, and pressure impregnated timber as waste is hazardous waste.
A further problem with pressure or immersion impregnation are expensive in¬ vestments on equipment and additionally the need to dry the timber again after the soaking.
In immersion impregnation it is at present possible to use wood treatment solu¬ tions that do not contain any substances dangerous to health. A wood treatment solution of this type is disclosed in Fl patent application 20011298. This applica¬ tion describes an environmentally friendly wood treatment solution that does not contain any heavy metals and that contains an impregnating agent consisting of an alkali metal or alkaline earth metal salt of formic acid or propionic acid. Such a salt can be used in an environmentally friendly manner as a wood preserva¬ tive to protect timber especially against decay and termites. In addition, this ma¬ terial has excellent absorption properties, in other words, it soaks into wood faster than e.g. water.
The object of the present invention is to overcome the drawbacks of prior art and to achieve a new type of method and apparatus for the protection of timber. The "method of the invention is based on the good absorption properties of new wood treatment materials. These properties are utilized to soak the material into the timber by spraying the material in the form of fine mist e.g. together with the final moistening water into the drying chamber by means of equipment intended for spreading of the moistening water after the drying and then circulating it in the chamber by means of fans.
The amount of liquid soaked into timber in connection with final moistening may give desired properties to the timber. Thus, by applying the invention, impregna¬ tion of timber can be performed in a drying plant in conjunction with a drying process, and no separate impregnation apparatus is needed.
The details of the features of the invention are presented in the claims below.
In the following, the invention will be described in detail with reference to an ex¬ ample and the attached drawing, wherein Fig. 1 presents a simplified view of the drying chamber of a timber drying plant.
Fig. 1 represents the heat treatment apparatus of a timber drying plant for the drying of timber 1 , comprising a closeable chamber 2 where the timber 1 is ar¬ ranged in a stack with laths between layers. The chamber 2 is provided with a heating unit 3 for heating the air and timber 1 in the chamber 2, a fresh air slide 4 for the supply of air into the chamber 2, an outlet slide 5 for passing the va- pors produced by the heating out of the chamber and a fan apparatus 6 pro¬ vided with an electric motor controlled by a frequency converter for enhancing air circulation in the chamber 2. In addition the apparatus comprises spraying nozzles 8 above the timber stack 1 for spraying final moistening water onto the bundle of timber. The heating unit 3, the slides 4, 5, the spraying nozzles 8 and the fan apparatus 6 are controlled by a control unit 7.
During the drying of timber 1 , the timber is heated to a temperature which is typically about 60 - 80 0C or in a special hot drying process over 100 0C in order to dry it (e.g. to a moisture of 10%).
The method of the invention is based on the good absorption properties of the wood treatment material. These properties are utilized to soak the material into the tLmber.by_spraying.t_he material [n .the form of fine mist together with the final moistening water into the drying chamber after the drying and circulating it in the chamber by means of fans. The wood treatment solution contains an impregnating agent, which is an alkali metal or alkaline earth metal salt of formic acid or propionic acid.
The alkali metal or alkaline earth metal salt of formic acid or propionic acid may be sodium formate, potassium formate, calcium formate or magnesium formate, and especially potassium formate or calcium formate. It is also possible to use mixtures of the aforesaid salts. The amount of alkali metal or alkaline earth metal salt of formic acid or propionic acid contained in the wood treatment solu¬ tion is e.g. 2-40 weight-%.
It is obvious to the person skilled in the art that different embodiments of the invention are not exclusively limited to the example described above, but that they may be varied within the scope of the claims presented below.

Claims

1. A method for the protection of timber via the use of a wood treatment mate¬ rial, characterized in that the wood treatment material is a wood treatment so- lution which is mixed in a moistening liquid and spread together with it into a drying chamber in conjunction with and/or after a drying process.
2. A method according to claim 1 , characterized in that the wood treatment material is spread with it into the drying chamber in the form of fine mist and circulated in the chamber by means of fans.
3. A method according to claim 1 , characterized in that the wood treatment solution contains an impregnating material that easily soaks into wood.
4. An apparatus for the protection of timber via the use of a wood treatment ma¬ terial, characterized in that the apparatus is a drying apparatus comprising a drying chamber and heating devices, and the wood treatment material is a wood treatment solution which is mixed in a moistening liquid and spread with it into the drying chamber in conjunction with and/or after a drying process.
5. An apparatus according to claim 4, characterized in that the material is soaked into the wood by spraying the material e.g. together with final moisten¬ ing water in the form of fine mist into the drying chamber by means of equip¬ ment intended for the spreading of moistening water after the drying, and circu- lated in the chamber by means of fans.
PCT/FI2005/000479 2004-11-10 2005-11-09 Method and apparatus for the protection of timber WO2006051155A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20041448 2004-11-10
FI20041448A FI20041448A0 (en) 2004-11-10 2004-11-10 Procedure and apparatus for protecting timber

Publications (1)

Publication Number Publication Date
WO2006051155A1 true WO2006051155A1 (en) 2006-05-18

Family

ID=33515212

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2005/000479 WO2006051155A1 (en) 2004-11-10 2005-11-09 Method and apparatus for the protection of timber

Country Status (2)

Country Link
FI (1) FI20041448A0 (en)
WO (1) WO2006051155A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109571676A (en) * 2018-12-25 2019-04-05 武汉积墨包装印刷有限公司 A kind of timber immersion treatment method
US10933555B2 (en) 2014-06-25 2021-03-02 Technologies Boralife Inc. Process and apparatus for treating lignocellulosic material

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB253041A (en) * 1925-11-30 1926-06-10 Himmelsbach Ag Gebr Improvements in the process of preserving wood by impregnation
FI12747A (en) * 1929-12-07 Förfaringssätt vid torkning av Travaror m.m. i vacuumtorkugn
GB412175A (en) * 1932-12-15 1934-06-15 Heinrich Ernst Will Improvements in methods of drying and impregnating wood
GB477742A (en) * 1936-03-28 1938-01-05 Henri Marie Andre Vautherin Preserving treatment for wood and product obtained thereby
GB578379A (en) * 1943-11-26 1946-06-26 James Atkinson Twyble Improvements in or relating to the drying of timber
GB700047A (en) * 1951-11-28 1953-11-25 Kenichi Suga A process for treating wood
FR2278048A1 (en) * 1974-07-11 1976-02-06 Vanicek Viktor Drying installation partic. for wooden components - has drying chamber subdivided and has thermal and moisture control devices
US4977686A (en) * 1987-05-04 1990-12-18 Top-Coop Idegenforgalmi Es Vendeglatoipari Kisszovetkezet Method for processing rough timber
WO1995034414A1 (en) * 1994-06-15 1995-12-21 Els Ltd. Device for drying and protecting wood
WO2002049818A1 (en) * 2000-12-20 2002-06-27 Windsor Engineering Group Limited A wood steaming apparatus and method of heating wood
FI20012422A (en) * 2001-12-10 2003-06-11 Raimo Matias Smolander Use of timber treated with fire retardant and biocide in individual zones and on an industrial scale
JP2004314526A (en) * 2003-04-18 2004-11-11 Kanako Aoki Method for steaming, insect-repelling and preservative treatment of timber
US20040261961A1 (en) * 2001-06-19 2004-12-30 Eero Aitta Wood treatment solution and process for improving the preservation of wood

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI12747A (en) * 1929-12-07 Förfaringssätt vid torkning av Travaror m.m. i vacuumtorkugn
GB253041A (en) * 1925-11-30 1926-06-10 Himmelsbach Ag Gebr Improvements in the process of preserving wood by impregnation
GB412175A (en) * 1932-12-15 1934-06-15 Heinrich Ernst Will Improvements in methods of drying and impregnating wood
GB477742A (en) * 1936-03-28 1938-01-05 Henri Marie Andre Vautherin Preserving treatment for wood and product obtained thereby
GB578379A (en) * 1943-11-26 1946-06-26 James Atkinson Twyble Improvements in or relating to the drying of timber
GB700047A (en) * 1951-11-28 1953-11-25 Kenichi Suga A process for treating wood
FR2278048A1 (en) * 1974-07-11 1976-02-06 Vanicek Viktor Drying installation partic. for wooden components - has drying chamber subdivided and has thermal and moisture control devices
US4977686A (en) * 1987-05-04 1990-12-18 Top-Coop Idegenforgalmi Es Vendeglatoipari Kisszovetkezet Method for processing rough timber
WO1995034414A1 (en) * 1994-06-15 1995-12-21 Els Ltd. Device for drying and protecting wood
WO2002049818A1 (en) * 2000-12-20 2002-06-27 Windsor Engineering Group Limited A wood steaming apparatus and method of heating wood
US20040261961A1 (en) * 2001-06-19 2004-12-30 Eero Aitta Wood treatment solution and process for improving the preservation of wood
FI20012422A (en) * 2001-12-10 2003-06-11 Raimo Matias Smolander Use of timber treated with fire retardant and biocide in individual zones and on an industrial scale
JP2004314526A (en) * 2003-04-18 2004-11-11 Kanako Aoki Method for steaming, insect-repelling and preservative treatment of timber

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10933555B2 (en) 2014-06-25 2021-03-02 Technologies Boralife Inc. Process and apparatus for treating lignocellulosic material
CN109571676A (en) * 2018-12-25 2019-04-05 武汉积墨包装印刷有限公司 A kind of timber immersion treatment method
CN109571676B (en) * 2018-12-25 2020-07-10 湖北千川门窗有限公司 Wood soaking treatment method

Also Published As

Publication number Publication date
FI20041448A0 (en) 2004-11-10

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