METHOD FOR PRODUCTION OF WOOD PARTICLE BOARDS Russian patent published in 1995 - IPC

FIELD: wood working; production of wood particle and fiber boards by dry method. SUBSTANCE: wood particles are prepared and dried by traditional method up to moisture content of 3-5%. Leather particles are used with moisture content of 3-17%. Dried wooden particles are mixed with formaldehyde-containing resin, e. g., KF-MT 15 in the amount of 12% of mass of absolutely dry wooden particles. Introduced by mixing into produced mixture is chrome-tanned leather particles in the amount of 25-60% of the molding material. Mixture is mixed for 4-6 min, and formed into mat and subjected to hot molding at temperature of 140-180 C for 0.3-0.5 min/mm of board at pressure of 2-2.5 MPa. Produced boards are held for 72 h at room temperature, cut into samples and tested. EFFECT: higher efficiency. 1 tbl