A process for the sealing of plastic profiled elements, comprising: - at least one step of supply of at least a machinery for the sealing of plastic profiled elements comprising: - at least a base frame; - retaining means (6, 7) associated with said base frame and adapted to retain at least one profiled element having at least one area to be sealed and a lateral surface at least in part covered with a film to be removed; - sliding means (8, 9) adapted to move said retaining means (6, 7) between a mutual spacing configuration, in which said areas to be sealed are mutually spaced apart, and a mutual approach configuration, in which said areas to be sealed are mutually approached; - heat-sealing means with a heated plate associated with said base frame and adapted to seal said pair of profiled elements; - at least one step of mutual movement of said retaining means (6, 7) adapted to arrange the areas to be sealed of each of said profiled elements facing each other; - at least one step of arrangement of said heat-sealing means with a heated plate in contact with said areas to be sealed; - at least one step of sealing said areas to be sealed; characterized by the fact that it comprises at least a step of heat shrinking of at least an ending portion of each of said films arranged at the respective area to be sealed, said film being made of a heat-shrink material. - at least one step of supply of at least a machinery for the sealing of plastic profiled elements comprising: - at least a base frame; - retaining means (6, 7) associated with said base frame and adapted to retain at least one profiled element having at least one area to be sealed and a lateral surface at least in part covered with a film to be removed; - sliding means (8, 9) adapted to move said retaining means (6, 7) between a mutual spacing configuration, in which said areas to be sealed are mutually spaced apart, and a mutual approach configuration, in which said areas to be sealed are mutually approached; - heat-sealing means with a heated plate associated with said base frame and adapted to seal said pair of profiled elements; - at least a base frame; - retaining means (6, 7) associated with said base frame and adapted to retain at least one profiled element having at least one area to be sealed and a lateral surface at least in part covered with a film to be removed; - sliding means (8, 9) adapted to move said retaining means (6, 7) between a mutual spacing configuration, in which said areas to be sealed are mutually spaced apart, and a mutual approach configuration, in which said areas to be sealed are mutually approached; - heat-sealing means with a heated plate associated with said base frame and adapted to seal said pair of profiled elements; - at least one step of mutual movement of said retaining means (6, 7) adapted to arrange the areas to be sealed of each of said profiled elements facing each other; - at least one step of arrangement of said heat-sealing means with a heated plate in contact with said areas to be sealed; - at least one step of sealing said areas to be sealed; characterized by the fact that it comprises at least a step of heat shrinking of at least an ending portion of each of said films arranged at the respective area to be sealed, said film being made of a heat-shrink material.