A method and an apparatus for the realization of printed polychrome decorations on elongated elements (1), which allows to obtain sharper decorations to a lower cost, comprises the projection of a plurality of jets of dyeing substances through respective nozzles (2) towards external surface zones (Z1, Z2, Z3, Z4, Z5) to be decorated of said elongated elements (1) while a distance (D) is kept which is substantially constant between said zones (Z1, Z2, Z3, Z4, Z5) and said nozzles (2), also in correspondence of profile variations of said zones; besides a section bar (1) is provided having decoration zones (Z1, Z2, Z3, Z4, Z5) on its external surface showing sharp outlines and realized with various dyeing substances, such as liquid substances, liquid suspension substances, powders, and also with sublimable inks and dyes.
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