made of polyvinyl chloride pvc a thermoplastic material and has a pattern which simulates wooden parquet flooring the tile 10 comprises a back ply 11 of black pvc fig4 which is formed with raised areas 12 on one surface 13 the raised areas 12 define a number of recesses 14 on the surface 13 and in the embodiment shown comprise series of parallel narrow ribs the ribs of adjacent series being arranged at right angles to one another in such a way that each recess 14 has a rectangular shape each series of recesses 14 comprises four parallel rectangles and each tile 10 has four series of recesses 14 around the perimeter of each tile 10 are four recesses 14 one along each side of the tile which are bounded by raised areas 12 only on their inner edges and at each end the tile of fig1 is made in a platen press constructed according to known principles and adapted to receive several molds at one time to make back plies for tiles each mold is placed on a platen in the press with a sheet of pvc on top of the mold and the platens originally spaced apart vertically are pushed together by a ram and are heated thus each mold is pressed towards the platen immediately above it by the platen immediately below it and each sheet of pvc is compressed between the associated mold and the platen immediately above it each sheet of pvc is thus embossed with the pattern on the mold part of a mold 15 for the back ply of a tile according to the present embodiment of the invention is shown in fig3 and comprises a metal platen 16 formed with grooves 17 for molding the ribs 12 when.