Coating processes – With pretreatment of the base – Organic base
Patent
1997-08-25
1999-12-28
Beck, Shrive
Coating processes
With pretreatment of the base
Organic base
427440, B05D 118
Patent
active
060078723
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of producing impregnated wooden products from wooden articles.
Various impregnating methods are known for treating wooden articles with the intention of preventing the occurrence of wood mould and wood rot. Such methods may involve placing the articles in a chamber, evacuating the chamber, introducing an impregnating agent thereinto, and then re-pressurizing the chamber. The impregnating liquid enters the wood cells to a greater or a lesser extent.
It is also known to produce hard elements, for instance floor boarding, by compressing different types of wooden products in conventional presses. The pressures applied in this regard do not normally exceed 500 bars, even though much higher pressures have been proposed. The use of these much higher pressures has not found practical use in the present context however, due to the fact that in conventional presses these high pressures can only be achieved in the case of very limited surface areas.
Application of this latter method normally results in considerable deformation of the material during compression. This deformation is not only caused in the direction in which the pressing forces act, but also transversely to this direction. This is because the material is pressed between an upper and a lower press plate which enables the wooden articles to expand freely in a lateral direction. When counter-pressure devices are used to impede this lateral expansion of the material, the presses become complicated and their use is limited to specific dimensions; see for instance Swedish Publication SE 601162 in this regard.
Patent abstract of Japan, vol. 16, No. 153, m-1235, abstract of JP-A-4-7101, discloses a method where wooden articles are compressed in a conventional pressing apparatus in a first step. The article is then immersed in a treating liquid in order to impregnate the article. Finally, the article is dried by treatment with heat.
Swedish Patent Application 9303821-4 describes a method of producing hard elements from a wooden article by applying very high pressures, i.e. pressures higher than 1,000 bars, and an isostatic pressing process, i.e. a process in which a uniform pressure is applied over the whole of the outer surface of the article. These high pressures can be applied to large surface areas by means of a so-called Quintuspress.
The present invention relates to a further development of the method described in the aforesaid Swedish and Japanese patent applications, and the object of the invention is to provide an impregnating method which will produce fire-retardant and/or rot-resistant and/or shape-durable elements and hard, impregnated elements respectively.
This article is achieved with a method having the characteristic features set forth in the following claim.
In the method according to the present invention, a wooden article is pressed isostatically in a first step at a pressure in excess of 1,000 bars, either in a so-called Quintuspress or by means of some other appropriate pressing method. In this regard, the extent to which the article is compressed will depend on its dry solids content, the fibre direction, its hardness and other properties. However, one of the cross-sectional dimensions of the article will normally be reduced by between 20-50% in the pressing operation, wherewith the wood cells are pressed together. The wooden article is then relieved of load.
The article is placed in a liquid bath containing impregnating agent in a second step, wherein the article successively swells as a result of liquid penetrating into and being absorbed by the wood cells. The liquid penetrates into the cells so that the article is completely impregnated throughout. Expansion of the article is contingent on the material properties thereof and also on the time during which the article remains in the bath, among other things. Normally, a marked expansion takes place within the course of some hours, and the material returns to its original form within this time period in certain cases. Suitable impregnating agents
REFERENCES:
patent: 3950577 (1976-04-01), Fry
patent: 5652065 (1997-07-01), Park et al.
patent: 5678618 (1997-10-01), Lindhe et al.
Patent Abstracts of Japan, vol. 16, No 153, M-1235, abstract of JP<A,4-7101, Jan. 10, 1992.
Derwent's abstract, No. 87-92305/13, week 8713, Abstract of SU 1248802, Aug. 7, 1986.
Castwall Lennart
Lindhe Curt
Beck Shrive
Calcagni Jennifer
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