METHOD FOR PRODUCTION OF LOW-TOXIC WOODEN CHIPBOARDS

摘要

Use: Woodworking industry, technology for manufacturing particle boards. SUMMARY OF THE INVENTION: modifying shredded chips treated with an aqueous solution containing urea and lignosul- sulfonate, taken in the ratio 1: 0.1-0,35 respectively at a flow rate modifying composition 0,3-1.5% on dry substance wood chips are then dried at a temperature of 110- 140 & amp; deg; C to a moisture content of 2% after drying the treated chips modified binder The binder is prepared by adding a urea-formaldehyde resin, urea in an amount of crystalline 3- 6%, after which it was allowed to stand for 3-5 days. Prior to application to the chips to the resin was added a wax emulsion and aqueous ammonium chloride solution resulting wood-adhesive composition is thoroughly mixed, formed therefrom carpets and compressed plates of hot mode pressing plates press temperature of 170 ± 5 & amp; deg; C press time 0.4 min / mm, a specific pressure of 1.8 MPa. The thickness of the plates 16 mm Table 4. Since CO