Production Process
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Phase 1: High-temperature drying
The kiln is heated rapidly to 100°C. After this, the temperature is
gradually increased to the desired level. During this process, the
timber dries and its moisture content decreases to zero.
Phase 2: Thermal modification
After high-temperature drying, the kiln is maintained at a steady
temperature and the actual modification takes place.
Phase 3: Cooling/conditioning
During the last phase, the temperature in the kiln is decreased with
a water-spray system. When the temperature is sufficiently low, the
timber’s moisture content is increased using water and steam to improve its machinability and dimensional stability. After the cooling
phase, the moisture content of ThermoWood® products is 4–7%.
The duration of the ThermoWood® process depends on the product
class (Thermo-S or Thermo-D), wood species and the raw material’s
moisture content and dimensions. The product gains its brown colour during the process when the heat changes its chemical properties. During thermal modification, softwoods secrete resin and
other organic compounds. Extractives are also removed from hardwoods. A special control system is used to adjust the temperature
to prevent the wood from cracking. Different settings are used for
different wood species and timber dimensions
Offices
Head Office
Manufacturing is entirely made in Mänttä-Vilppula.
Lahnajoentie 196
35700 Mänttä-Vilppula
Finland
