The continuous press is the machine where occurs the coupling between the sheets and the insulating material. The two belts where this coupling happen are composed of electrically welded steel slats, thermically treated and worked by machine tool to obtain the maximum planarity. When the panel thickness changes, the upper belt is moved up or down by a series of jacks. In case of polyurethane sandwich panels, the machine is equipped by two side chains that contain the foam during its expansion process. The profile of border is gave to the foam by a series of side blocks locked to the side chains. For a good expansion of foam, the continuous press is equipped by two indipendent heating systems.