Fig. 7,
the samples of high MF resin content above 50%
showed increasing bonding strength with increasing
temperature. However, PVAc adhesive’s mechanical
resistance decreased with increasing hot-press temperature. In the case of PVAc only, the bonding strength was
sharply decreased. The adhesion layer of PVAc was
broken at high-temperature conditions over 60 1C, in
agreement with the reports by some other researchers
They reported that PVAc loses its bonding resistance
capacity over 70 1C. The addition of 30% MF resin did
not raise the bonding strength with increasing hot-press
temperature