Method of making foam core building panels in a continuous operation

A method of producing composite panels comprising the steps of:

• depositiong lower rigid sheets sequentially in end-to-end relation on a moving surface;
• providing a barrier at each side of the moving sheets;
• depositing foamable material on the surface of the moving sheets, positioning upper rigid sheets sequentially in end-to-end relation to each other and in overlying relation to the foamable material, whereby a moving column of foaming material between upper and lower sheets is formed and, as the foaming material expands and cures, it moves into gripping engagement with the panel sheets therebelow and those thereabove;
• and cutting the moving column into appropriate panel lengths at an area of the column at which the foam has solidified, said step of providing a barrier at each side of the moving sheets consists of depositing stiffener bars in end-to-end relation on the upper surface of the lower moving sheets along each side edge, whereby the spaced stiffener bars coact with the upper surface of the sheets to define a moving trough adapted to receive foamable material, as the foaming material expands and cures, it moves into gripping engagement with the stiffener bars.