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2 203 177

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Application

2001120836/13, 2001-07-26

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Start date

2001-07-26

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Actual filing date

2001-07-26

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Published

2003-04-27

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Inventor

Birjukov V.G.Balakin M.I.Mishkov S.N.Sobolev A.V.

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Holder

Moskovskij Gosudarstvennyj Universitet Lesa

METHOD OF MANUFACTURE OF FIREPROOF PLYWOOD Russian patent published in 2003 - IPC

Abstract RU 2203177 C1

FIELD: wood working industry. SUBSTANCE: non-dried rotary-cut birch veneer, 1.5 mm thick, is impregnated with working solution of diammonium phosphate until 25-35% of dry salt is absorbed. Concentration of working solution is 45%, temperature is 60 C and duration of impregnation is 25 min. After impregnation, sheet of veneer is dipped into second "leveling" solution of diammonium phosphate, concentration 30%, at temperature of 65 C and is held in solution for 2 min. As a result, content of fire proofing in veneer becomes 22-27%. After drying, no salt stains are seen on veneer. Plywood glued from veneer sheets treated as stated above, also has no salt stains on its surface. EFFECT: provision of uniform distribution of fireproofing compound in veneer and prevention of formation of salt stains on surfaces of dried veneer. 2 cl

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RU 2 203 177 C1

Authors

Birjukov V.G.

Balakin M.I.

Mishkov S.N.

Sobolev A.V.

Dates

2003-04-27—Published

2001-07-26—Filed

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