| 摘要 |
There is described a forming method for producing sealed packages (2) from a tube (3) of sheet packaging material fed along a feed path (A), filled continuously with a pourable food product, and having a succession of identical, equally spaced decorations (4). To form each package (2), the method includes the successive steps of: gripping and sealing the tube (3) at a first cross section by means of a jaw assembly (12, 13); exerting, by means of traction means (50) movable by varying amounts between two limit positions, an adjustable first pulling action on the tube (3) to correct feed of the tube in response to a signal (S) related to the position of the decorations (4) along the feed path (A); and gripping and sealing the tube (3), at a second cross section located upstream from the first cross section, by means of another jaw assembly (12, 13). The method also includes the further step of exerting, after sealing the second cross section, a second pulling action on the tube (3) by performing a substantially complete movement of the traction means (50) between the limit positions. <IMAGE> <IMAGE> |
