浸胶法杨木单板层积材的热压传热分析

Heat Transfer in Resin Impregnated Poplar LVL during Hot-pressing

采用热电偶法测量杨木单板层积材在热压过程中表层和芯层的温度的变化规律,讨论了施胶方式以及浸胶量和热压温度、压力对板坯在热压过程中传热的影响。结果表明:施胶量相当时,浸胶方式在快速升温阶段的升温速度较快;同时随着浸胶量的增加板坯传热速度增加,但浸胶量不影响板坯的总热压时间。

Better understanding of heat transfer and resin curing during hot pressing will help optimize the wood composite manufacturing process in increasing productivity and improving product quality. Electrical-thermocouples were used in this study to investigate the effects of resin application methods, resin content, hot-pressing temperature, and pressure in hot-pressing poplar laminated veneer lumber （LVL）. The results indicated that during the initial pressing stage, the internal temperature increased more rapidly by using a resin impregnation method than a resin spread method. It was found that higher resin content accelerated heat penetration towards the core. However, the resin content didn＇t significantly affect total hot-pressing time.