摘要
以杨树人工林木材单板为试材,在进行三聚氰胺甲醛树脂浸渍组坯后,利用高频设备热压成型,并以此探讨高频热压胶合中板坯内的温度场分布和变化规律。结果表明:高频热压胶合中板坯内温度随时间变化曲线可用乘幂函数表示。对于板坯的温度场分布,在板材长宽方向,因边缘各点的含水率差异导致加热过程中温度的不一致,但在超过100℃后各点温度会逐渐接近;厚度方向上,高频电场中板坯的中心或两表层温度并非最高,最高温度出现在靠近正极板的部位,最低温度出现在紧贴负极板表层。
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.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2011年第1期113-117,共5页
Scientia Silvae Sinicae
基金
"十一五"国家支撑专题"家具地板材功能修饰与仿真技术"(2006BAD18D06)
引进国际先进林业科学技术创新项目专题"竹
木基重组装饰材料制造与示范"(2006-4-C04)
关键词
杨树
三聚氰胺甲醛树脂
高频
热压
温度场
乘幂函数
poplar
melamine-formaldehyde resin（MF）
high-frequency
hot pressing
temperature
power function
