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State of the art
The protection of wood by any kind of coatings is primarily based on a physical attachment of the coating material to the surface of wood.
The resins are either solvent or water based and are applied by different kind of applications. Only the application of powder particles differ from the conventional methods and is based on the conductivity of the water known as the required moisture content . The adhesion of the particles is also seen to be of a physical art.
Using a powder coating system results in a lot of problems in the application process and furthermore in a sufficient required durability and a short period of regular renovation intervals.
Conductive wood and chemical bonding
COVERED WOOD® as a result of research carried out during the last years approaches the problem of application from a new way seeking a direct chemical bonding to different kind of wood components.
As a result of this particular new approach a lot of advantages compared to the traditional methods of physical attachment of covering wood can be reached.
By pre-treatment with organic materials and an additional treatment with conductive solvents (wood is made conductive without a required moisture content) a chemical substitution on the surface of the wood takes place resulting in a reduction of water absorption.
This leads to a prevention of the chemo-sorption up to 7 % moisture content and furthermore to a reduction of defects caused by external water penetration. In addition shrinkage and swelling is reduced, too. Based of these advantages the natural durability is increased, UV absorption on the surface is around 100 % and therefore a renovation is not required any more.
Further advantages in the application process
Based on this chemical treatment of the wooden surface making it conductive by the substitution of some wooden components the modified surface can be used for further application processes, too.
One of these application processes, if required, can be seen in an additional surface application using the powder technology. As mentioned above the application with powder particles is based on a moisture content of around 10 % in addition with Infra red allowing the particles to melt and forming a uniform thickness. By making the wooden surface conductive, using conductive chemicals in a pre-treatment stage, moisture content is not required any more in the application process with powder particles. This opens new ways in a further treatment of wooden surfaces by conventional materials and will lead to a uniform surface treatment. Due to the fact of the state of the art in surface treatment at least more than one method is required.
As an example High Solids being used in the conventional process are in most cases combined with vacuum technology since not al parts can be coated by High Solids themselves.