关键词: 杨树, 三聚氰胺甲醛树脂, 高频, 热压, 温度场, 乘幂函数

Abstract:

In this paper, poplar were selected as the raw materials, melamine-formaldehyde resin(MF)was selected as adhesive, high-frequency hot pressing process was used to analyze the variation of temperature inside the mats for thick wood-based panels. The results showed the process of high-frequency hot pressing of the reconstituted lumber, power function was appropriated in describing the variation of temperatures inside the mats as a function of time. In length-width direction, the temperature may be different in heating process due to the moisture content. However, when the temperature surpass 100 ℃, temperature will gradually become stable. Along the direction of the thickness, the highest temperature was observed neither at the middle nor the surface layers of mats in high-frequency electric field, it occurred somewhere close to the positive plate, and the lowest temperature occurrrd near the negative plate.

Key words: poplar, melamine-formaldehyde resin(MF), high-frequency, hot pressing, temperature, power