Method of manufacturing a floor or wall panel

A method of manufacturing a floor or wall panel comprising a foamed polymer core， wherein a foamable polymer powder is at least partially frothed between two conveyor belts of a double belt press in the forming zone of a steel belt press， the sum of the thicknesses of the two conveyor belts and the total thickness of the layers at the entrance to the steel strapping press is less than or equal to the opening of the steel strapping press at the entrance to the steel strapping press， and wherein the sum (T4) of the thicknesses of the two conveyor belts and the total thickness of the substrate at the exit of the steel strapping press - is equal to the opening of the steel strapping press at the exit of the steel strapping press and - is greater than the sum of the thicknesses of the two conveyor belts and the total thickness of the layers at the entrance to the steel strapping press.