2.2. Methods
2.2.1. Surface bonding strength
The bonding strength between the fancy veneer and plywood
was evaluated with a Universal Testing Machine (UTM, Hounds
Co.) in the tensile mode. Samples were cut at 50mm×50mm
(length×width) and a knife mark of 20mm×20mm was made
on the surface (fancy veneer face) to a depth of 0.5mm.We bonded
the upper device of UTM and the surface knife mark with hot-melt
adhesive. Another face was bonded to the underneath of the device
like the internal bonding strength test specimen. The tests were
performed at a crosshead speed of 2mm/min