EP1759822A1 - Method for artificial ageing of wood materials and the like - Google Patents

Method for artificial ageing of wood materials and the like Download PDF

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Publication number
EP1759822A1
EP1759822A1 EP06120023A EP06120023A EP1759822A1 EP 1759822 A1 EP1759822 A1 EP 1759822A1 EP 06120023 A EP06120023 A EP 06120023A EP 06120023 A EP06120023 A EP 06120023A EP 1759822 A1 EP1759822 A1 EP 1759822A1
Authority
EP
European Patent Office
Prior art keywords
wood
piece
reference temperature
pressure
time interval
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Withdrawn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
EP06120023A
Other languages
German (de)
English (en)
French (fr)
Inventor
Stefano Grosso
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
Publication of EP1759822A1 publication Critical patent/EP1759822A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • 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
    • B27K1/00—Damping 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
    • 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
    • B27K5/007—Treating of wood not provided for in groups B27K1/00, B27K3/00 using pressure
    • 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
    • B27K5/02—Staining or dyeing wood; Bleaching 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
    • B27K2240/00—Purpose of the treatment
    • B27K2240/50—Ageing
    • 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 for the artificial ageing of wood materials and the like.
  • the colour of recently cut wood i.e. of green timber
  • the first is virtually constant in all types of wood taken into consideration, while the second presents a high degree of variability which depends not only on the type of wood taken into consideration, but also on the area of origin of the material and on many other environmental and non-environmental factors.
  • the prolonged exposure to sunlight initially produces a rapid yellowing and/or browning of the colour on the surface of the material, followed by dye toning to light brown and finally to uniform grey due to the progressive decrease in colour saturation.
  • This phenomenon is mainly due to a process of photochemical oxidation in which both ultraviolet wavelengths (wood absorbs ultraviolet light very well, and even better when immersed in water) and infrared wavelengths, which have a considerable thermal degrading action on the surfaces, are relevant.
  • the method according to the present invention envisages to maintain the piece of wood to be treated in contact with hot humid air at a reference temperature T 2 higher or equal to reference temperature T 1 , and at a pressure P 2 essentially equal to the saturation vapour pressure corresponding to the reference temperature T 2 itself.
  • the method according to the present invention envisages to maintain the piece of wood to be treated in contact with vapour-saturated hot air, the pressure P 2 and the temperature T 2 of which meet Clausius-Clapeyron's mathematical relation and the trend of which is shown by the curve in figure 2.
  • the method according to the invention envisages that the vapour-saturated hot air which brushes on the piece of wood to be treated has in any case a pressure P 2 higher than or equal to 1.8 bars, which corresponds to a reference temperature T 2 of approximately 117°C.
  • the piece of wood to be treated is maintained in contact with the vapour-saturated hot air within an airtight container of the known type, in which the hot air is maintained at pressure P 2 and the correct temperature T 2 is reached and maintained by keeping water boiling within the same container.
  • the method according to the present invention envisages to gradually take the piece of wood to be treated to a reference temperature T 1 of approximately 140°C in a time interval h 1 of approximately 3 hours, maintaining the same piece of wood in contact with hot air at ambient temperature, i.e. at a pressure of approximately 1 bar.
  • the method according to the present invention envisages to maintain the piece of wood to be treated for a time interval h 2 of approximately 4 hours in contact with vapour-saturated hot air at a pressure P 2 of approximately 4 bars and at a reference temperature T 2 of approximately 143°C.
  • time interval h 2 the method according to the present invention envisages to gradually return the piece of wood to be treated to ambient temperature, employing for this operation a time interval h 3 equal to approximately 5 hours.
  • reference temperature T 1 , reference temperature T 2 and pressure P 2 , as time interval h 1 , time interval h 2 and time interval h 3 are a function of both the type of wood to be treated and the colour of the wood to be obtained.
  • the method for the artificial ageing of wood materials and the like described and illustrated above also allows to stabilise the cellular structure of wood, reducing the risks of dimensional instability of the material.
  • the heating of the piece of wood to reference temperature T 1 may occur in contact with hot air at a pressure higher than ambient pressure, similarly the cooling of the piece of wood to ambient temperature may occur in contact with hot and humid air, at a pressure higher than ambient pressure.

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)
EP06120023A 2005-09-02 2006-09-01 Method for artificial ageing of wood materials and the like Withdrawn EP1759822A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO20050599 ITTO20050599A1 (it) 2005-09-02 2005-09-02 Metodo per l'invecchiamento artificiale di materiali lignei e similari

Publications (1)

Publication Number Publication Date
EP1759822A1 true EP1759822A1 (en) 2007-03-07

Family

ID=37309823

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06120023A Withdrawn EP1759822A1 (en) 2005-09-02 2006-09-01 Method for artificial ageing of wood materials and the like

Country Status (2)

Country Link
EP (1) EP1759822A1 (it)
IT (1) ITTO20050599A1 (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2955050A1 (fr) * 2010-01-08 2011-07-15 Richard Michallet Procede de vieillissement du bois d'oeuvre.
DE102012105501A1 (de) * 2012-06-25 2014-01-02 Rolf Goldschmidt Verwitterte Holzoberfläche
DE102013223415A1 (de) 2013-11-15 2015-05-21 Holzwerke Gmach GmbH Verfahren zur künstlichen Holzalterung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB703722A (en) * 1950-09-05 1954-02-10 Mapa Ag Improvements in or relating to the curing of wood
GB822958A (en) * 1955-03-09 1959-11-04 Iroszergyar An improved process for the manufacture of pencil wood from non-cedar woods
WO2000058676A1 (en) * 1999-03-31 2000-10-05 Assidomän AB Method for drying of wood
EP1291143A2 (en) * 2001-08-30 2003-03-12 Yamaha Corporation Method for manufacturing modified wood

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB703722A (en) * 1950-09-05 1954-02-10 Mapa Ag Improvements in or relating to the curing of wood
GB822958A (en) * 1955-03-09 1959-11-04 Iroszergyar An improved process for the manufacture of pencil wood from non-cedar woods
WO2000058676A1 (en) * 1999-03-31 2000-10-05 Assidomän AB Method for drying of wood
EP1291143A2 (en) * 2001-08-30 2003-03-12 Yamaha Corporation Method for manufacturing modified wood

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2955050A1 (fr) * 2010-01-08 2011-07-15 Richard Michallet Procede de vieillissement du bois d'oeuvre.
DE102012105501A1 (de) * 2012-06-25 2014-01-02 Rolf Goldschmidt Verwitterte Holzoberfläche
DE102012105501B4 (de) 2012-06-25 2021-10-14 Rolf Goldschmidt Verwitterte Holzoberfläche
DE102013223415A1 (de) 2013-11-15 2015-05-21 Holzwerke Gmach GmbH Verfahren zur künstlichen Holzalterung

Also Published As

Publication number Publication date
ITTO20050599A1 (it) 2007-03-03

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