Compared with conventional hot pressing, which is usually carried out by conduction heating from the surface, the pressing duration can be greatly shortened by HF hot-pressing. Fig. 1 showsthe temperature change rule of time on the core layer of boardsduring pressing. The time that the core layer temperature reached 100◦C for high frequency hot pressing was 75 s, whereas the value for conventional hot-pressing was 765 s. It was approximately 10-times longer than the former value. During HF hot-pressing, the energy directly transferred into the whole board is absorbed by the asymmetric molecules and transformed into heat, thus it does not only rely on conduction from the hot platens [30,41]. There-fore, the temperature of the core layer and surface layer of theboard rise very quickly at the same time. Additionally, the press cycle of HF hot-pressing was only approximately 1/7 of the conventional hot pressing. In fact, it is not feasible to manufacture thickFig