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
  • B27K5/02—Staining or dyeing wood; Bleaching wood
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/06—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to 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
  • B27K3/0278—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
  • B27K2240/00—Purpose of the treatment
  • B27K2240/50—Ageing

Definitions

• a method and an agent for surface treatment of wood, particularly furniture surfaces of undressed pinewood are provided.
• the present invention relates to a method of chemically treating wooden surfaces, particularly furniture or furniture parts of pinewood, for accentuating the wood structure by affecting the colour of the surface parts, whereby the wooden surface is treated by a tannin solution and thereafter subjected to a lye treatment. It is a very old knowledge that the vein structure or play in a surface of oakwood can be strongly accentuated by a so-called acid-washing treatment and that such a treatment gives rise to a very characteristic and drastic change of the colour of the wood, whereby no "natural" colour is aimed at.
• the example relates to a piece of furniture, e.g. a chair or a cupboard made of fresh pinewood, the visible surfaces of which should be treated for patination and accentuation of the surface play.
• the treating liquids can be applied manually or by dipping the entire piece of furniture into a bath of the particular liquid.
• a tannin solution is applied to the wood, preferably with a concentration of ca. 0.75%, a preferred component being "Pyrogallol" ("white chip") dissolved in demineralized water, if desired with a small amount of a relaxation agent and a tracer agent, the latter of course being superfluous when the solution is applied by dipping of the entire piece of furniture into the solution.
• the solution may be prepared from 7.5 g Pyrogallol to one litre of demineralized water.
• the workpiece or the relevant surfaces thereof is or are treated by soda lye of a concentration of 0.92-0.98% (NaOH dissolved in demineralized water), and the workpiece is allowed to dry for at least 3 hours.
• the soda lye may be prepared from liquid NaOH, 34°BE, 27.65% (technical 33%) mixed in the proportion 1:35 with demineralized water.
• an acid-free plastic lacquer e.g. No. 1302 LS is applied to the workpiece or the relevant surfaces, and the lacquer is allowed to dry for at least one hour, whereafter the relevant surfaces are smoothed by means of grinding paper, e.g. grain 320, with subsequent wiping or brushing off of the slip. If desired, a further layer of lacquer may thereafter be applied to the relevant surfaces.
• the treating liquids are based on distilled or demineralized water and that the workpiece is subjected to the said lacquering once or still better twice.
• An essential parameter is the concentration of the base solution. Normally it should be somewhere between 0.9% and 1.0%, but the exact or optimal concentration will depend on the local character of the pinewood. However, to those skilled in the art it will be easy to select the correct percentage of the base solution for obtaining the desired true to nature colour shading of the particular wood as seen in its patinated condition.
• demineralized water as a solvent mainly refers to a desired lack of iron in the water, because even a relatively small amount of iron in the water will affect the colour shade of the product adversely.
• demineralized water there are several geographic regions in which the natural water has such a low iron contents that it is directly usable in the method according to the invention.

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)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8111940

Family Applications (1)

Country Status (4)

Families Citing this family (3)

Family Cites Families (4)

• 1980
  • 1980-06-03 DK DK237480A patent/DK237480A/da unknown
• 1981
  • 1981-06-03 EP EP19810901706 patent/EP0052648A1/de not_active Withdrawn
  • 1981-06-03 WO PCT/DK1981/000060 patent/WO1981003459A1/en not_active Ceased
• 1982
  • 1982-02-02 SE SE8200595A patent/SE8200595L/xx not_active Application Discontinuation

Non-Patent Citations (1)

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