Strength-grading of veneer sheets
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United States of America Patent
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Jun 11, 1996
Issued Date -
N/A
app pub date -
Mar 2, 1994
filing date -
Mar 15, 1993
priority date (Note) -
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Abstract
A method of enhancing the strength and of reducing strength variations of multi-layer wood, plywood or similar by measuring the density of the veneer sheets used in the production and by grading the veneer sheets accordingly. The density of the veneer sheets is measured in a manner known per se by using a high-frequency electromagnetic resonator (2). To build up layers of multi-layer wood, plywood or similar (12), veneer sheets confirmed to have a higher density are graded as surface sheets (13) and/or local density variations of central sheets (14) are reduced by mixing veneer sheets with various densities.
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