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Jartek
P.O. Box 14
FI-15101 Lahti, Finland
Tel. +358 3 787 5400
Fax. +358 3 787 5282
sales(at)jartek.fi
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| ThermoWoodŽ Process |
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ThermoWoodŽ - thermal modification process has been developed and patented
by VTT Technical Research Centre of Finland.
The process uses only heat, steam and water. No chemicals are added to
timber.
Process can be divided into three phases:
1. Temperature increase
Wood temperature is raised rapidly using heat and steam to a level of
around 100 °C. Thereafter the temperature is increased steadily to 130 °C.
Raw material can be green of pre-dried wood. Steam is used to prevent
cracking of the wood. It also affects the chemical changes taking place in
the wood. Moisture content reduces to nearly zero.
2. Actual thermal modification
During actual thermal modification phase the temperature is increased to a
level of 185-215 °C. Temperature depends on the desired treatment class.
When the target level has been reached, the temperature remains constant
2-3 hours. Steam is used to prevent the wood from burning in high
temperatures and it also affects to the chemical changes in the wood.
3. Cooling and re-conditioning
The temperature is reduced by using water spraying as cooling media.
Conditioning and re-moisturing takes place to bring the wood moisture
content to a level of 4-6 percent.
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