Knife markA mark or scar across the veneer caused by a damaged blade on the veneer slicing machine. This damage may be caused by a knot or a foreign body (a stone or piece of metal for instance) being embedded inside the log. A slight knife mark will not be a problem and will disappear when the surface is sanded. If the scar is deep then it will not be possible to use this part of the veneer.
Knife marks of the birch face veneer plywood,caused by the face veneer ,not the plywood factory .THe workers should be careful when grade these birch face veneer with knife marks .