The Research on Temperature Variation Characteristic of Wood during High-intensity Microwave Pretreatment

High-intensity microwave pretreatment (HIMP) is a kind of wood modification technology with great potential. In this study, a microwave (MW) treatment of plantation poplar (populous deltoids) wood was investigated by applying MW treatments with varying conditions, such as radiation power, irradiation time, and initial moisture content of the wood. The effect of microwave pretreatment conditions on internal temperature of wood was studied systematically. Results show that the temperature of wood increased with the microwave radiation intensity and the irradiation time. Excessive moisture content would make the wood heated up slowly. The temperature of wood changed in three stages: rapid heating stage, constant temperature section and slow heating section.