Apparatus for forming elongated synthetic resin plate or sheet

In an apparatus for forming an elongated synthetic resin plate or sheet by supplying a resinous starting material having a predetermined thickness to between an upper steel belt and a lower steel belt, and heating the resinous starting material through the two steel belts while applying pressure, followed by cooling, the improvement wherein said lower steel belt is placed on a lower board and is intermittently fed by a predetermined distance, side frames are installed on the lower steel belt, said side frames stretching on both the right and left edges of the lower steel belt in the lenghwise direction thereof, said upper steel belt is disposed between said two side frames, an upper board is installed on the upper steel belt, either one of the upper board or the lower board is so constructed as to move up and down, the resinous starting material is pressed by the pressing operation of the board which moves up and down via the upper and lower steel belts, and the upper and lower boards are divided into a plurality of blocks so as to correspond to the opposing ones, thereby to constitute heating zones having heating means and cooling zones having cooling means.