How is heat treatment carried out?
Heat treatment is carried out with water vapour and a change of temperature. The duration of the thermo-treatment process is 1.5 – 3 days.
After the first stage of the process, the timber is fully dried at a temperature of +100 degrees. Then the temperature of the wood is gradually increased to 175 – 210 degrees for 2-3 hours, depending on the tree species, the thickness of the raw material and the desired colour tone. The structure of the wood changes during the process, when water and resin is removed from the wood and the wood becomes a stylish brown colour. Thereafter, the temperature of the timber is reduced to a normal temperature.
The popularity of heat treating wood has increased in recent years. The ecological process, which is based on water vapour and a high temperature, has been used to replace the chemical treatment of wood in order to improve the properties of wood. Heat treatment can be considered to provide wood protection without processing, and it does not emit any harmful substances into the soil. Thermo treatment improves the properties and appearance of wood: decay resistance, moisture resistance and thermal insulation improve, and the changes caused by moisture are reduced, and the wood gets an even, through-coloured brown tone.
The emissions of heat-treated wood into the surrounding air are extremely low. Thermally modified wood is classed in the best indoor air classification category, the M1 category.
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