Abstract: Process for the netlike opening of fibrilled polymeric films, said process consisting in conveying to an opening device of the conventional type (based, for instance, on diverging transferring elements and on lateral film pulling elements such as clamps, grippers or pins, which engage the film at its edges and which are fixed on said traverse elements) the fibrilled film of an undulated or corrugated shape, with the front of the corrugations or waves perpendicular to the direction of the transferring motion, so that the length of the film between the lateral consecutive pulling elements be in excess with respect to the distance between said elements, wherefore said excess will compensate the longitudinal shrinkage that the film will suffer during the transversal opening.