B - Operations – Transporting – 27 – K
Patent
B - Operations, Transporting
27
K
B27K 5/04 (2006.01) B27K 3/32 (2006.01)
Patent
CA 2520331
According to an aspect of the present invention there is provided a method for manufacturing a woody material for construction use, the method comprising the steps of: a) removing beforehand moisture, oil and fat contained in a wooden material, and securing voids in the wooden material, b) impregnating the wooden material sufficiently with a flame retardant prepared in such a manner that an aqueous solution of condensate of phosphoric acid and urea is pH adjusted by adding ammonia water, ammonium borate and ammonium sulfamate, c) repeating thereafter depressurization treatment and pressurization treatment a plurality of times in room temperature or high-temperature atmosphere to obtain an impregnated wooden material which is impregnated with the flame retardant 100% to 250%, d) drying thereafter the impregnated wooden material to obtain a flame retardant woody material, and e) after drying, coating or spraying a mixture of alcohol and nondrying solvent onto the surface of the flame retardant woody material.
Bb Wood Japan Co. Ltd.
Marks & Clerk
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