Investigating Rotary Veneer Cutting with the Aid of a Tension Test

A special method was used to investigate rotary veneer cutting at the State Institute for Technical Research in Finland. In these tests, the tensile strength of the veneer perpendicular to the grain, determined by means of a tension test, was adopted as the standard of veneer quality. Additional tests along similar lines at the U.S. Forest Products Laboratory are described. With the tension test to evaluate veneer quality, the influence of nosebar pressure on the quality of lathe-cut veneer is more accurately determined. The Finnish method of measuring the tensile strength made it possible to employ a standard materials-testing machine designed for testing paper. The sensitivity of the machine was satisfactory for testing veneer strips 1.5 centimeters (0.59 inch) wide. The ultimate strength obtained in the tension test was divided by the cross-sectional area of the test specimen (width times actual thickness), so that the results 2 (f) were expressed in terms of kg./cm2. It is obvious that the tension test method can be used to evaluate the quality of veneer cut on the slicer, since such veneer may also have knife checks, as does rotary-cut veneer.

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