Wood veneer quality indicators and influencing factors
Sep 8,2024
Various defects are prone to occur during the wood peeling process of veneers, so there are veneer quality problems. The quality of veneers is mainly measured based on the following indicators: veneer thickness deviation (i.e. processing accuracy), veneer back crack degree, veneer back roughness and veneer transverse tensile strength. The first two of these indicators are the most important veneer quality indicators, because if the number of cracks on the back of the veneer is large and the depth is large, the surface smoothness of the veneer is poor and the transverse tensile strength is relatively small.
(1) Veneer thickness deviation "The veneer should be of uniform thickness, but in fact there is always a difference. The indicator for identifying the uniformity of veneer thickness is: the difference between the actual average thickness of the peeled veneer and the nominal thickness of the veneer.
The veneer thickness deviation has the following characteristics:
① In current production, the actual thickness of the veneer is generally larger than the nominal thickness, and varies with different tree species;
2) The veneer peeled by a poorly maintained plywood veneer peeling machine has a larger deviation than that of a well-maintained one;
③ The peeling conditions have an impact on the actual thickness of the veneer.
