Strength-grading of veneer sheets

Details Strength-grading of veneer sheets Strength-grading of veneer sheets

1994-03-02

1996-06-11

Bollinger, David H.

Classifying, separating, and assorting solids

Sorting special items, and certain methods and apparatus for...

Sorting lumber, logs, pipes, rails, or like items

209521, 209567, 209571, B07C 514

Patent

active

055247717

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.

REFERENCES:
patent: 3812964 (1974-05-01), Woodruff
patent: 4239577 (1980-12-01), Hartman et al.
patent: 4610913 (1986-09-01), Barnes
patent: 4739249 (1988-04-01), Nyfors et al.
patent: 4905843 (1990-03-01), Holbert
patent: 4915766 (1990-04-01), Baxter
patent: 5002105 (1991-03-01), Bodig
patent: 5006225 (1991-04-01), Beauchemin et al.
patent: 5096765 (1992-03-01), Barnes
patent: 5351833 (1994-10-01), Quick
Vainikainen, et al., "Radiowave Sensor for Measuring the Properties of Dielectric Sheets: Application to Veneer Moisture Content and Mass per Unit Area Measurement," IEEE Transactions on Instrumentation and Measurement, vol. IM-36, No. 4, Dec. 1987.

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