用废纸与木片制备复合包装材料的热压工艺研究

热压温度与热压时间是热压工艺的主要参数,是影响废纸－木材复合材料物理力学性能的重要因素.为了获得较好的热压工艺条件,以杨木刨花为原料,废纸为补充原料,异氰酸酯改性的脲醛树脂为胶黏剂,生产了废纸－木材复合材料,并测试了热压温度与热压时间对废纸－木材复合材料物理力学性能的影响.试验结果表明：随着热压时间的延长,废纸－木材复合材料的物理力学性能相应地提高;在140～170 ℃的热压温度范围内,升高热压温度有助于提高废纸－木材复合材料的物理力学性能.废纸－木材复合材料较适宜的热压工艺条件为：热压时间为每mm板厚30 s,热压温度为170 ℃.

Study of Hot Pressing Process for Composite Packaging MaterialMade from Waste Paper and Wood

As important factors influencing the physical and mechanical properties of waste paper/wood composites,hot pressing temperature and time are the principal parameters of hot press process. To attain better hot pressing processconditions, waste paper/wood composites were produced with poplar shaving as raw material, waste paper as supplement,and isocyanate modified urea formaldehyde as adhesive resin. The effects of hot pressing temperature and time on thephysical and mechanical properties of waste paper/wood composites were tested. The results showed that as hot pressing timeincreased, the physical and mechanical properties of waste paper/wood composites improved. In the range of 140～170 ℃,increasing hot pressing temperature helped enhance the physical and mechanical properties of waste paper/wood composites.The appropriate hot pressing process condition for the waste paper/wood composite was 30 s per mm board thickness and170 ℃ hot pressing temperature.