A creasing unit for creating fold lines in cardboard, comprising two crease rollers, each crease roller having a circumferential protrusion adapted for indenting cardboard to create a fold line, wherein the crease rollers are rotatably mounted next to each other such that each crease roller can rotate about its own center axis and each crease roller is movable between at least a first position for creating a fold line and a second position for either allowing cardboard to pass the respective crease roller without being indented by the respective crease roller or for creating an additional indented line being less deep than the fold line.