Woodworking – Process – Mechanical cutting or shaping
Patent
1985-03-28
1986-08-19
Husar, Francis S.
Woodworking
Process
Mechanical cutting or shaping
144380, 144362, 427297, B27M 102
Patent
active
046063889
ABSTRACT:
Low quality, low density woods are densified to form wood products having the characteristics of high quality natural hardwoods. A green solid wood member having a high moisture content is impregnated with anhydrous ammonia to plasticize the wood into a sponge-like form saturated with water and ammonia. This plasticized wood member is placed between press plates of a cyclic press and, while maintaining the temperature of the wood below 100.degree. C., it is subjected to a plurality of low pressure compression cycles each of about 1/2 to 1 minute duration with the wood being compressed to a predetermined thickness of up to 50% less than its original thickness. It is held at the reduced thickness for a short time and released during each cycle, whereby water and ammonia are squeezed out of the wood down to a moisture content of less than about 30%. The damp wood member of reduced thickness thus obtained is then dried to obtain a kiln dried, densified solid wood product. This method may be used to densify wood planks, pre-glued laminates and thin veneers. For veneers, a simpler pressing system and higher temperatures may be used.
REFERENCES:
patent: 2101542 (1937-12-01), Hartzell
patent: 2343016 (1944-02-01), Loughborough
patent: 3282313 (1966-11-01), Schuerch
patent: 3642042 (1972-02-01), Davidson et al.
patent: 3646687 (1972-03-01), Berzin et al.
patent: 3894569 (1975-07-01), Huttunen
patent: 4473099 (1984-09-01), Koike et al.
Griffin John M.
Husar Francis S.
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