For ordinary wood drying, the temperature of 100 degrees Celsius is commonly used, 100--150 degrees is high temperature, and 150 degrees is high temperature. The heat treatment of fir wood poles is to use wood to continue processing for a certain period in a high temperature and low oxygen content environment close to or above 200 degrees. After time, the hemicellulose in the wood is degraded, the hydroxyl groups in the wood cell wall are reduced, the hygroscopicity of the wood is reduced, and the standard stability and resistance to biological damage are improved. Therefore, high-temperature heat-treated wood has received widespread attention as a new material.

The impact of the treatment process on the material is crucial, such as treatment temperature, treatment time, heating rate, wood species, weight and standard of the specimen, initial moisture content and other parameters, which will all affect the performance of the product. The confirmation of the treatment process is mainly based on the product The application intention is to optimize between the improvement of water absorption performance and the decrease of mechanical properties to find an acceptable balance point. According to the different media used in the treatment, the treatment process is mainly divided into three types.

Compared with untreated wood, the obvious change of heat-treated wood is the decrease in equilibrium moisture content, and then the related expansion and contraction are improved. Tests have proved that when the treatment temperature exceeds 200 degrees, the weather resistance and resistance of pine wood are reduced. The biggest change after treatment of birch and poplar is that the impact of changes in the moisture content of the wood on its standard stability is significantly improved. The overall results show that the radial wood with a more uniform material has a better treatment effect, while the radial wood containing knotted wood has better corrosion resistance. Or the chordal wood will have more shortcomings after treatment.