喷蒸真空热压水溶性酚醛胶杨木大片刨花板

PF Poplar Flakeboard from Steam-injection-vacuum Pressing

我国防水人造板生产目前普遍采用酚醛树脂胶 (PF) ,热压周期长 ,生产效率低。笔者采用南京林业大学饱和蒸汽喷蒸试验压机 ,压制水溶性 PF胶杨木大片刨花板。结果表明 ,采用喷蒸真空热压 (SIVP)技术 ,热压时间可缩短到传统热压的 35 %左右 ;板的吸水厚度膨胀率 (TS)缩小 33% ;在相同施胶量下 ,板的内结合强度 (IB)提高约 15 % ,同时甲醛释放量降低约 2 4 % ;但板的抗弯性能有较大幅度的下降 ;此外 ,板材芯层最低密度值比传统热压的板增高 。

Phenol formaldehyde resin (PF) is used widely in water resistant wood based panel manufacturing in China, but its above 100 ℃ curing temperature and long pressing time result in low productivity. This study focused on Poplar flakeboards using aqueous phenol formaldehyde resin (PF) by steam injection vacuum pressing(SIVP) . Comparing the processing parameters and quality indexes of board by SIVP with that in conventional techniques, the results showed that by SIVP, the board pressing time could be shorten to 35% of that in conventional pressing; some physical and mechanical properties of the boards could be improved: the thickness swelling ( TS ) was decreased by 33%, the internal bond strength ( IB ) increased about 15%, formaldehyde emission of the board was reduced by 24%. But the bending property of board was reduced significantly. The board had higher core density with more uniform density profile.