Apparatus for producing rigid foam plastic laminated board

In an apparatus for making a foam plastic laminated board having a foam plastic core encased between an upper and a lower sheet member and in which said apparatus has a lower conveyor comprising abutting platens forming a continuous support surface in a horizontal plane, and an upper conveyor settably spaced from said lower conveyor, said conveyor having abutting platens forming a continuous limiting surface in a plane parallel to said horizontal plane of said lower conveyor and a pair of sheet unwind stations adjacent said conveyors adapted to provide said upper and said lower sheet members to said upper and lower conveyors, respectively, the improvement comprising having said platens of said upper conveyor shorter in a transverse direction than said platens of said lower conveyor, spaced limiting means attached along outer edges of each platen of said lower conveyor, said limiting means being located outwardly of the outer edges of said platens of said upper conveyor, said lower sheet having a width such that said lower sheet substantially spans the distance between said limiting means on said lower conveyor and said upper sheet having a width such that the outer edges of said upper sheet overlay said limiting means.