| 摘要 |
There is described an apparatus (10, 10', 10'') for forming an opening device (3) on a receiving portion (8) of a sheet packaging material (2) for packaging pourable food products; the apparatus (10, 10', 10'') comprises a molding unit (30) operating at a molding zone (31) of the apparatus (10, 10', 10'') and having a first and a second mold (32, 33; 71, 70) selectively set in an open configuration, in which they are spaced from one another to allow feed of the packaging material (2) therebetween, and in a closed configuration, in which they cooperate with opposite faces of the packaging material (2) and delimit a closed mold cavity (34) housing the receiving portion (8) of the packaging material (2) and adapted to be filled with molten plastic material to define, when the plastic material sets, the opening device (3); the apparatus (10, 10', 10'') further comprises feeding means (35) to feed a dose (36) of molten plastic material to the molding zone (31) in the open configuration of the first and second mold (32, 33; 71, 70), and pressing means (37) carried by the molding unit (30) and exerting pressure on the dose (36) to force it to fill the mold cavity (34) and to form the opening device (3). |
