Method for manufacturing a high strength lumber

Details Method for manufacturing a high strength lumber Method for manufacturing a high strength lumber

1998-05-11

1999-08-17

Bray, W. Donald

Woodworking

Process

Mechanical cutting or shaping

144329, 144359, 144364, 144361, 34382, 34388, 428114, 4285371, B27M 100

Patent

active

059379251

ABSTRACT:
A method for manufacturing a high strength lumber obtained by artificially compressing a volume of grown natural wood without any destruction of wood tissue, and which is made such that a pine tree is lumbered and exposed to a microwave whereby moisture content is forcibly discharged and cellulose is softened and thereby volume is constricted up to more than 70% by a hydraulic press during a latent heat is still present, so that a high strength lumber is obtained without any destruction of lumber tissue and due to this, a strength and hardness are improved about 30 times of original wood and a tensile strength is increased about up to 10 times of original wood.

REFERENCES:
patent: 4469156 (1984-09-01), Norimoto et al.
patent: 4672006 (1987-06-01), McGraw
patent: 5088533 (1992-02-01), Binder
patent: 5343923 (1994-09-01), Tanahashi et al.
patent: 5685353 (1997-11-01), Viitaniemi et al.

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