Plant and method for making decorations on prefabricated waterproofing bitumen-mix membranes

A plant for making decorations on a bituminous membrane comprising:

• feed means configured to feed said bituminous membrane at a determinate speed in a direction;
• at least two depositing apparatuses disposed one in series with the other in said direction and configured to deposit solid particles on said bituminous membrane according to respective patterns in order to obtain respective decorations on said bituminous membrane, said depositing apparatuses each comprising a transfer member configured to receive, support, and then transfer said solid particles from a respective feed device to the surface to be enhanced of said bituminous membrane;
• synchronization means associated with the transfer members and configured to manage the drive speed of each of the transfer members and to control and synchronize the drive speeds of said transfer members with respect to each other at least according to construction or installation parameters of said depositing apparatuses, said construction or installation parameters comprising at least one of either sizes of said transfer members, distances of said transfer members with respect to said bituminous membrane, and reciprocal positions of said transfer members;
• and
• a control and command unit connected at least to the synchronization means and to the feed means and configured to control and command said synchronization means and said feed means so as to coordinate the actuation speeds of said transfer members with respect to each other and the movement speed of said bituminous membrane.