Abstract: The apparatus for the wrapping of palletized product groups with a film or band of plastic includes a framework with two vertical support uprights on a support structure of a carriage supporting a reel of plastic film and a pre-stretching unit driven by an electric motor and envisages that the support structure consists of a vertically moving structure supported by the support framework and by a rotating ring supported by the vertically moving structure and rotating around its own axis driven by a motor anchored to the vertically moving structure and connected to it; the carriage is fixed to the rotating ring and supports an electric generator for powering the electric motor of the pre-stretching unit and maintained with its own shaft continuously linked to a respective annular toothed track fixed to the vertically moving structure.

Abstract: The end of a length of stretch film enveloping a pallet is restrained, prior to being heat-sealed, by a gripping mechanism that can be traversed toward and away from the pallet, and is capable of contracting longitudinally in a direction parallel to the plane occupied by the tail end of the film, transversely to the wrapping direction, from a position of engagement in which the gripping surfaces are spaced apart and uniformly in contact with the film over its maximum width, to a position of restraint in which the selfsame surfaces are drawn together, pinching the film to produce a uniform succession of folds and thus narrowing the material to a width that can be accommodated fully by the heat-seal plate.

Abstract: A pallet base stacked with commodities for wrapping is positioned on a horizontal platform, whereupon the wrapping operation is effected by an L-profile beam carrying a roll of plastic film and rotatable about a vertical axis in such a way as to circle the platform and wind the film around the pallet; to advantage, the horizontal member of the beam lies below the uncoiling roll of film, passing between the platform and a horizontal bed afforded by the stationary frame of the apparatus, such that with the L-beam set in rotation about the main axis a low center of inertia is achieved.