METHOD FOR MAKING PRESSED MODIFIED WOOD Russian patent published in 1994 - IPC

Abstract RU 2024667 C1

FIELD: woodworking. SUBSTANCE: method involves impregnating wood blanks with aqueous solution of carbamide under vacuum, pressing blanks in two stages, releasing pressure between stages, holding wood in I stage for 45-95 min. Heat treatment after pressing is conducted at 150-180 C for 60-150 min. Blanks are impregnated in presence of phosphoric acid at a carbamide/acid relation from 2.5:1 to 30:1. Amount of used carbamide is 5-15% of mass of perfectly dry wood blanks. EFFECT: higher efficiency. 3 cl, 2 tbl

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RU 2 024 667 C1

Authors

Leonovich Adol'F Anufrievich

Dates

1994-12-15Published

1992-02-21Filed