Process for making engineered lignocellulosic-based panels

Details Process for making engineered lignocellulosic-based panels Process for making engineered lignocellulosic-based panels

B - Operations, Transporting

27

N

B27N 3/02 (2006.01) D04H 1/00 (2006.01)

Patent

CA 2479293

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 3Ø 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.

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