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:
Nov. 28, 2006
Filed:
Sep. 05, 2003
Jack G. Winterowd, Puyallup, WA (US);
Roger M. Shantz, Enumclaw, WA (US);
Daniel V. Hanson, Auburn, WA (US);
Michael N. Taylor, Tacoma, WA (US);
Jack G. Winterowd, Puyallup, WA (US);
Roger M. Shantz, Enumclaw, WA (US);
Daniel V. Hanson, Auburn, WA (US);
Michael N. Taylor, Tacoma, WA (US);
Weyerhaeuser Co., Federal Way, WA (US);
Abstract
A process for making engineered lignocellulosic-based panels with superior strength and dimensional stability. The process comprising adding to green lignocellulosic particles a low-nitrogen content, high molecular weight, phenol-formaldehyde resin before the green particles are dried. The resin is added in an amount from about 1 to 25 weight percent based on the dry weight of the green lignocellulosic particles. The resin has a nitrogen content of from about 0 to 3%, a viscosity of from about 20 to 2000 cps at 20° C., and a molar ratio of formaldehyde/phenol of from about 1.2 to 3.0. The green lignocellulosic particles treated with the resin are dried until the particles have a moisture content of from 1 to 8%. A second resin is added to the dried particles and then the dried particles are consolidated under heat and pressure to form the engineered panel.