Chipboard or laminated board hot pressed - using dielectric heating and supporting air cushion to minimise losses

摘要

A method of making pressed chipboard, fibre board or laminated wood board out of a mixt of wood particles and thermosetting binding agent consists of continuously feeding this mixt through heating, pressing and hardening stages. The mixt is formed into a layer of material, which is then pressed to a predetermined thickness and, after pressing, is dielectrically heated to harden the binding agent. Pref. the layer of material is conveyed between upper and lower endless belts to a pressing device which determines the required thickness and then between a pair of plates, spaced apart, which are subject to a flow of pressurised fluid which applies the belts onto the layer of material while the binding agent hardens.