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A platform for research: civil engineering, architecture and urbanism
Thermal modification of Sitka spruce
The objective of this thesis was to make thermal modification for Sitka spruce and find out its suitability for the Thermo Wood process. The thermal modification process was done using the standards of the Thermo Wood process. At the end of the thermal modification and drying sessions, quality inspections were based on the Thermo Wood standards. The thesis was done for a company called Jartek Oy, which supplies wood processing equipment and mills. Jartek Oy ordered the study from the Lahti University of Applied Sciences. The skope of this thesis was to conduct practical tests and to report the results to Jartek Oy. During the thermal modification process the wood material will be heated to at least 180 degree Celsius. Steam is used as a safe gas, which protects the wood material from risks of fire. The steam also affects the chemical changes to the wood material during the process. As a result of the thermal modification Thermo Wood is created and the wood material is more stable than normal wood and resistance against wood decay is better. The thermal modification darkens the wood color and it is suitable for different applications in interior and exterior use. Green sawn Sitka spruce timber was shipped to Finland from the United Kingdom. The timber was sawn to dimension 25 x 150 x 2200 mm. Green Sitka spruce stacks contained approximately 50 % of heartwood and 50 % of sapwood. After the thermal modification process Sitka spruce samples were tested in several different ways. It seems that the moisture difference of knots is the main factor that contributed to the knots cracking and dropping off. Knot cracking is a major problem, which prevents commercial use. The main factor causing knot cracking is the difference of moisture content between wood material and knot. The Sitka wood material itself looks good and it is suitable for thermal modification. More testing must be done to find a way to avoid knot cracking. Without knot cracking thermally modified Sitka spruce would have great commercial value. ; Tämän ...
Thermal modification of Sitka spruce
The objective of this thesis was to make thermal modification for Sitka spruce and find out its suitability for the Thermo Wood process. The thermal modification process was done using the standards of the Thermo Wood process. At the end of the thermal modification and drying sessions, quality inspections were based on the Thermo Wood standards. The thesis was done for a company called Jartek Oy, which supplies wood processing equipment and mills. Jartek Oy ordered the study from the Lahti University of Applied Sciences. The skope of this thesis was to conduct practical tests and to report the results to Jartek Oy. During the thermal modification process the wood material will be heated to at least 180 degree Celsius. Steam is used as a safe gas, which protects the wood material from risks of fire. The steam also affects the chemical changes to the wood material during the process. As a result of the thermal modification Thermo Wood is created and the wood material is more stable than normal wood and resistance against wood decay is better. The thermal modification darkens the wood color and it is suitable for different applications in interior and exterior use. Green sawn Sitka spruce timber was shipped to Finland from the United Kingdom. The timber was sawn to dimension 25 x 150 x 2200 mm. Green Sitka spruce stacks contained approximately 50 % of heartwood and 50 % of sapwood. After the thermal modification process Sitka spruce samples were tested in several different ways. It seems that the moisture difference of knots is the main factor that contributed to the knots cracking and dropping off. Knot cracking is a major problem, which prevents commercial use. The main factor causing knot cracking is the difference of moisture content between wood material and knot. The Sitka wood material itself looks good and it is suitable for thermal modification. More testing must be done to find a way to avoid knot cracking. Without knot cracking thermally modified Sitka spruce would have great commercial value. ; Tämän ...
Thermal modification of Sitka spruce
Torvinen, Pentti (author) / Lahden ammattikorkeakoulu
2010-01-01
10024/317
Theses
Electronic Resource
English
DDC:
690
The acidity of stored Sitka spruce chips
| British Library Online Contents | 1996
An evaluation of home-grown Sitka spruce
| TIBKAT | 1976
Combustion Characteristics of Sitka Spruce Litter by Microcalorimetry
| British Library Online Contents | 1997
Combustion Characteristics of Sitka Spruce Litter by Microcalorimetry
| Online Contents | 1997
Bending and shear properties of compressed Sitka spruce
| British Library Online Contents | 2007