Finish Checking of Hardwood Veneered Panels as Related to Face Veneer Quality

A study was made to determine the effect of veneer quality (as measured by tightness of cut), assembly methods, depth of sanding, and presence or absence of filler on the subsequent finish checking of lumber core plywood panels faced with rotary-cut yellow birch, plain-sliced walnut, and plain sliced white oak. Panels (10 by 30 inches) were assembled with loose- and tight-cut veneers having both open and closed faces exposed. These panels were reduced to a test specimen size of 10 by 5 inches, given either a heavy or light sanding, filled or left unfilled, and finished with either a synthetic varnish or a high grade lacquer. After subjection to alternating high and low humidity the specimens were examined on both cross-sectional and finished surfaces. The cross-sectional surfaces showed that the great majority of finish checks were directly traceable to knife checks in the face veneers. The conclusion was reached that with certain combinations of veneer quality, assembly method, and depth of sanding, finish checks due to knife checks may be either minimized or completely eliminated.

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