METHOD OF COATING CHIPBOARD Russian patent published in 1998 - IPC

FIELD: wood working. SUBSTANCE: method consists in impregnating paper being in contact with upper and lower surfaces of chipboard with urea-melamine-formaldehyde resin containing 30-60 wt % of solid components, 4-10 wt % of plasticizer, and also surfactants, catalyst, and demolding-assistance means. Impregnation is led until outside paper sheets contain 30-60 wt % of solid particles of resin and inside sheets 45-60 wt %, while content of volatile substances in sheets is 5-7 wt %. Material is then pressed at temperature 130-180 C. EFFECT: simplified facing of chipboards. 6 cl