Abstract: A decoration correction method for a form-and-seal unit for producing sealed packages of a pourable food product from a tube of packaging material fed along a feed path, and having two pairs of jaws movable along the feed path and opened and closed so as to travel, cyclically and alternately with each other, along a form-and-seal portion along which the pairs of jaws are closed and travel integrally with the tube, and along a repositioning portion along which the pairs of jaws open and move with respect to the tube. To make a decoration correction, a nominal trajectory of the jaws is modified along the repositioning portion on the basis of a position error of the tube with respect to a nominal position. A first solution provides for correcting the travel of the jaws by selectively modifying the amplitude of the trajectory; and a second solution provides for correcting the phase of the jaw trajectory.

Abstract: A decoration correction method for a form-and-seal unit (1) for producing sealed packages of a pourable food product from a tube (2) of packaging material fed along a feed path, and having two pairs of jaws (7) movable along the feed path and opened and closed so as to travel, cyclically and alternately with each other, along a form-and-seal portion along which the pairs of jaws (7) are closed and travel integrally with the tube, and along a repositioning portion along which the pairs of jaws open and move with respect to the tube (2). To make a decoration correction, a nominal trajectory (P) of the jaws (7) is modified along the repositioning portion on the basis of a position error of the tube (2) with respect to a nominal position. A first solution provides for correcting the travel of the jaws by selectively modifying the amplitude of the trajectory; and a second solution provides for correcting the phase of the jaw trajectory.

Abstract: A form and seal unit (1) for producing aseptic sealed packages from a tube (2) of packaging material filled with a pourable food product; the unit having a fixed structure (3), and two forming assemblies (5, 5′) interacting alternately and cyclically with the tube (2) of packaging material, and in turn having respective pairs of jaws (7) movable between an open position and a closed position in which the jaws grip the tube (2) of packing material between respective sealing members (13, 14), and respective forming flaps (21) having respective half-shell forming portions (22) which surround the tube (2) of packaging material to determine the shape and volume of the packages; the closing movement of the forming flaps (21) about the tube (2) of packaging material is controlled by cams (30) carried by the forming flaps (21) and interacting with rollers (64) fixed to the structure (3) of the unit (1).