Abstract: An apparatus for loading and unloading a multiopening press for manufacturing fibreboard comprises a first endless conveyor movable through an upper opening of a press having upper and lower openings with an intermediate plate therebetween. The first endless conveyor is formed of a plurality of conveyor sections which are spaced along the first conveyor and connected together by at least one drive member. A second endless conveyor is movable through the lower opening of the press. The first and second conveyors move along first and second feed paths through the upper and lower opening of the press respectively. The first conveyor however intersects the second feed path with the at least one drive member positioned on the first conveyor to permit passage of a mat for making a fibreboard on the second feed path to the second conveyor when each of the conveyor sections is spaced away from a location of intersection of the first conveyor and the second feed path.

Abstract: A double opening press comprises an intermediate movable plate, a lower fixed plate and an upper movable plate. Heating platens are connected to the upper movable and lower fixed plates and to upper and lower surfaces of the intermediate plate. The intermediate plate is rigid in structure and has dielectric layers between itself and the heating platens connected thereto so that the heating platens can be heated using high frequency energy. The intermediate plate and structures connected thereto are grounded and need not be made of electrically insulating material.