The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 11, 1996
Filed:
Mar. 02, 1994
Applicant:
Inventors:
Matti Kairi, Lohja, FI;
Pertti Helminen, Lohja, FI;
Assignee:
Finnforest Oy, Lohja, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B07C / ;
U.S. Cl.
CPC ...
209518 ; 209521 ; 209567 ; 209571 ;
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.