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 The SUPERWOODTM process is a new and exciting impregnation process, which enables complete impregnation of wood species that are difficult to impregnate, e.g. spruce. The process provides protection that is fully equal to or better than competing processes, without adding moisture or staining the wood, or changing any other characteristics of the wood.
Supercritical wood impregnation

A new and Danish developed impregnation method, based on impregnation by means of supercritical CO2, has proven capable of significantly reducing problems related to the environment during wood impregnation. By using this method, the use of chemicals per m3 wood is significantly reduced compared to conventional methods, and the use of heavy metal salts and boric acid is avoided. By using supercritical CO2 as a solvent, the use of organic solvents is also avoided. In addition, the method has numerous advantages for the wood handling.

The wood is completely impregnated and can be processed without exposing unimpregnated wood; the method enables the impregnation of wood species such as spruce that cannot be impregnated using traditional methods; and the wood may be used immediately after the impregnation since the process leaves neither large amounts of water nor solvents in the wood.

 

The Process - from wood to SUPERWOOD

SUPERWOOD is impregnated at our industrial impregnation plant located in Hampen Denmark. The dry wood is impregnated in packages as they are received from the sawmill. An automated transportation system forwards the wood packages to the impregnation vessels where the impregnation is carried out.

 

1. The wood is forwarded to the impregnation vessel. CO2 and wood preservatives are added to the vessel and the pressure is increased.

 

 

 

2. The socalled "critical" values of pressure and temperature are reached and the CO2 - now supercritical - carries the wood preservatives into the wood.

  

3. The wood is impregnated to the core and remains dry for the entire duration of the process

 

 

 

4. The pressure returns to normal and the process is completed. The wood - still as dry as before the process began - is now impregnated to the core and can be used immediately. Excess CO2 and wood preservatives are collected and recycled.