EP0052648A1 - A method and an agent for surface treatment of wood, particularly furniture surfaces of undressed pinewood - Google Patents

A method and an agent for surface treatment of wood, particularly furniture surfaces of undressed pinewood

Info

Publication number
EP0052648A1
EP0052648A1 EP19810901706 EP81901706A EP0052648A1 EP 0052648 A1 EP0052648 A1 EP 0052648A1 EP 19810901706 EP19810901706 EP 19810901706 EP 81901706 A EP81901706 A EP 81901706A EP 0052648 A1 EP0052648 A1 EP 0052648A1
Authority
EP
European Patent Office
Prior art keywords
wood
base
concentration
treatment
shade
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Withdrawn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
EP19810901706
Other languages
German (de)
French (fr)
Inventor
Sven Eric Bagger
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 EP0052648A1 publication Critical patent/EP0052648A1/en
Withdrawn legal-status Critical Current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
    • 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)

Abstract

Pour accentuer la structure des veines en surface du pin, en particulier des meubles en pin, le bois est soumis a un traitement acide/lessive, qui affecte la teinte du bois frais. Au lieu d'essayer d'obtenir une teinte claire correspondant au bois en brume, dont la teinte de la couleur naturelle est pratiquement impossible de conserver ou de reproduire, l'invention vise a obtenir une teinte plus sombre, qui peut etre obtenue sous forme d'une teinte vraiment naturelle du bois patine, bien que cela s'applique a du vieux bois en grume. Le resultat est obtenu essentiellement en utilisant une lessive liquide relativement concentree.To accentuate the structure of the veins on the surface of the pine, in particular pine furniture, the wood is subjected to an acid / lye treatment, which affects the color of the fresh wood. Instead of trying to obtain a light shade corresponding to wood in mist, whose shade of natural color is practically impossible to preserve or reproduce, the invention aims to obtain a darker shade, which can be obtained in the form a really natural shade of patina wood, although this applies to old log wood. The result is obtained essentially by using a relatively concentrated liquid detergent.

Description

A method and an agent for surface treatment of wood, particularly furniture surfaces of undressed pinewood.
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.
In connection with pinewood it is normally desirable that the colour impression should still, despite the surface treatment, be maintained close to the natural colour of the fresh wood, because pinewood is extensively used as so-called "undressed wood". In this connection it is well known that without departing considerably from the fresh natural colour the wood structure may be accentuated when the surface is treated first by a tannin solution and then by a suitable base such as soda lye. It has hereby been specifically endeavoured to maintain the light colour shade of the fresh natural or undressed pinewood generally, as far as this is possible, but it is a common opinion among relevant skilled persons that the associated inevitable deviation from the natural colour shade is nevertheless so pronounced that the treated wood surface is not in any way perceivable as natural or undressed pinewood, and for this reason the treatment has not come in widespread use, despite its veine accentuating advantages. The present invention is based on the cognition that although it is difficult or impossible to adjust the acid/lye treatment so as to achieve a natural colour shade as referring to the appearance of the fresh wood, it is nevertheless possible to produce a fully natural colour shade, viz. when compared with aged wood of a naturally darkened colour shade. In this connection it will be correct to speak of a "patination" of the wood surface in combination with the accentuation of the veine structure, and the method, according to the invention, has proved usable for obtaining, a surprisingly true to nature patination of fresh wood based mainly on a specially adapted acid/lye treatment, which even sets off the veine structure in a suitably temperate manner .
Practice has shown that in the furniture trade it is of utmost importance that furniture pieces of the undressed wood type show a very high degree of natural appearance as far as their colour shade is concerned, and the fulfilling of this condition seems by far more important than the question whether the appearance refers to fresh or aged wood. Thus, what is important to the relevant industry or trade is to provide furniture of a natural appearance, and so far this has been accomplished by presenting to the customers furniture of either fresh and substantially untreated or undressed wood or furniture of naturally aged wood, and the provision of instantly artificially aged or patinated wood according to the present invention is an extremely important contribution, because it enables the furniture to appear with an accentuated surface "play" and yet with a truly natural colour shade, though limited to that of aged wood. As mentioned, however, the real natural appearance of the wood, whether fresh or old, seems to be much more important than the real or believed aging of the wood, and it is an obvious advantage of the invention, therefore, that pieces of furniture are made readily attractive and sellable because of their natural appearance with increased surface "play", without the wood really having to be aged at correspondingly increased expenses. The invention is in no way limited to the treatment of furniture parts of pieces of an old-fashioned style, because even modern furniture is made attractive by the combination of an accentuated surface play and a really natural colour shade even when the latter refers to aged wood.
It should be emphasized that the dark shading of the wood is not obtained by means of ahy dyfestuff, but already by the pure acid/lye treatment, whereby the wood reacts by darkening when the base as finally used is relatively concentrated. It could well be known to the experts that the final colour shade will be darker the stronger the base is, but so far this knowledge has been utilized only to adjust the concentration of the base for the attainment of a desired colour shade of the light end of the colour scale. It has not previously been known that a real natural colour can be obtained by entirely leaving the light shade range and pure cultivating quite another natural colour shade, viz. the patinated colour, which is then experienced to be achievable with a remarkable accuracy.
When in this connection reference is made to a relatively concentrated base, normally sodium hydroxide, this should be understood in a pronounced relative manner, by comparison with the prior art, because the discussed darkening of the wood is in fact achieved by a rather small increase of the concentration of the base solution, which is in advance a rather weak solution. Thus, with the use of NaOH-solution the light colour shades will be obtained by a concentration of some 0.7-0.8%, while for obtaining the darker shade according to the invention the concentration should be some 0.85-1.0%. It will be noted, however, that an increase from e.g. 0.75% to 0.95% represents an increase of ca. 25%, and moreover it has been experienced that in order to obtain a really natural patination colour shade it is necessary to adjust the base concentration rather accurately, somewhat depending of how the wood is treated otherwise.
The invention, in accordance with the foregoing, is defined in the appended claims. The acid/lye-treatmeht so far described is necessary for achieving the desired true to nature patination of the wood, but in practice the result will be fully satisfactory only when further measures are taken and even are followed by a special final treatment. In the following, therefore, a more detailed example of the method of the invention will be given:
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.
At first 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. After this treatment the workpiece is allowed to dry for 3-24 hours or more. The solution may be prepared from 7.5 g Pyrogallol to one litre of demineralized water. Thereafter 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.
Thereafter a thin layer of 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.
For obtaining a perfect result it is essential that 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.
It should be mentioned that the preferred use of 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. On the other hand, 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.

Claims

1. 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 portions thereof, whereby the wooden surface is treated by a tannin solution and thereafter is subjected to a lye treatment for accentuating the surface play of the wood, characterized in that the treatment is effected in such a manner and with the use of a base of such a concentration that the wood surface or surfaces adopt a dark shading corresponding to a natural patination of the wood.
2. A method according to claim 1, in which is used a tannin solution having a concentration of ca. 0.6-0.9%, characterized in that the liquid as used for the subsequent lye treatment has a base concentration of 0.9-1.9%.
3. A method according to claim 2, characterized in that the base concentration is 0.92-0.98%.
4. A method according to claims 2 or 3 , characterized in that the tannin solution as well as the base solution is based on distilled or demineralized water.
5. A method according to any of the preceding claims, characterized in that the treated wood is allowed to dry at least 3 hours between the liquid treatments.
6. A method according to any of the preceding claims, characterized in that the wood 3 hours after the lye treatment or later is lacquered by an acid-free plastic lacquer, which is ground off after drying and preferably coated by another thin lacquer layer.
7. A liquid for lye treatment of wood in connection with the method claimed in claim 2, characterized in that is consists of a base dissolved in substantially demineralized or distilled water and has a base concentration of 0.9-1.9%, preferably 0.92-0.98%.
EP19810901706 1980-06-03 1981-06-03 A method and an agent for surface treatment of wood, particularly furniture surfaces of undressed pinewood Withdrawn EP0052648A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK2374/80 1980-06-03
DK237480A DK237480A (en) 1980-06-03 1980-06-03 PROCEDURE FOR SURFACE TREATMENT OF WOOD NAMELY FURNITURE COATS

Publications (1)

Publication Number Publication Date
EP0052648A1 true EP0052648A1 (en) 1982-06-02

Family

ID=8111940

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810901706 Withdrawn EP0052648A1 (en) 1980-06-03 1981-06-03 A method and an agent for surface treatment of wood, particularly furniture surfaces of undressed pinewood

Country Status (4)

Country Link
EP (1) EP0052648A1 (en)
DK (1) DK237480A (en)
SE (1) SE8200595L (en)
WO (1) WO1981003459A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1024271C2 (en) * 2003-09-11 2005-03-21 Albert Eltjo Doewe Capelleveen Leached floorboards.
LT6135B (en) * 2013-05-24 2015-03-25 Uab "Grigo" Process for producing bog oak
ES2894574R1 (en) * 2020-07-28 2022-02-24 Mestre Jose Escorihuela Aging process of coniferous wood with caustic soda NA(OH)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK22898C (en) * 1916-07-10 1918-03-18 Hans Kristoffer Grini Procedure for Dyeing and Preserving Wood.
GB152427A (en) * 1919-07-14 1920-10-14 Roland Edgar Slade An improved process for colouring wood grey or black
GB189268A (en) * 1921-09-08 1922-11-30 Malcolm Sparkes Improvements in the treatment of wood and in treated wood
US1925749A (en) * 1931-11-25 1933-09-05 Tannin Corp Method of making mahogany stain

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8103459A1 *

Also Published As

Publication number Publication date
SE8200595L (en) 1982-02-02
WO1981003459A1 (en) 1981-12-10
DK237480A (en) 1980-08-22

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Effective date: 19820803