Patent ID: 6868644

Claim:
Method of deforming a wood fibre board blank into a shaped product in a mould cavity in a press having at least an upper mould and lower mould, at least one of the upper mould and the lower mould movable toward the other from a first open position for receiving the blank to a second closed position defining the mould cavity, the method comprising: heating the blank to a thermo softening point such that the material of the blank is plastically deformable; providing the mould cavity in the closed position with at least one constriction adapted to restrict lateral extrusion flow of the softened material of the blank, the constriction located to prevent defects in the shaped product; heating at least one of the upper mould and the lower mould; and pressing the blank in the mould cavity in a pressing cycle comprising at least one period of gradual progressive deforming followed by at least one period of rest while heating without opening the mould cavity.