PROBLEM TO BE SOLVED: To provide a method for efficiently manufacturing a billboard of high quality by eliminating various conventional problems upon manufacturing the billboard suitable to material-recycling.
SOLUTION: A continuous sheet-like body 1, functioning as a billboard base material, obtained by extrusion-molding pelletized recycled material is continuously fed by feed rolls (a) to a laminating position where heat rolls (d) are arranged. Upper and lower film sheets 2 and 3 are supplied from respective rolls (c) as their supply positions to the laminating position while adjusting the tension of the films by adjusting rolls (b), and then, the film sheets 2 and 3 are heated by the heat rolls (d) with pressure, and thermally fused on the upper and lower surfaces of the continuous sheet-like body 1, just after that, the fused upper and lower film sheets 2 and 3 are rapidly cooled by cooling rolls (e) disposed at upper and lower positions. Thereafter, the continuous sheet-like body is cut into a predetermined length, then, the foam original billboard is obtained, and printing is performed thereon.
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