Abstract: An apparatus for manufacture of laminated panels having a foamed plastics core material includes an inclined press having a fixed platen surface and a movable platen surface hinged adjacent its lower edge. Panel thickness is adjustable by a mechanism which moves the hinge pivot relative to fixed platen surface. The platen surfaces are clamped at their upper edges by spaced clamps operable by lever and crank assemblies. A retractable seal spacer has liquid plastics injection nozzles and gas venting tubes in fluid communication with a hollow cavity in the press.