| 摘要 |
There is described a packaging machine (1) for producing sealed aseptic packages (2) of a pourable food product from a tube (3) of packaging material fed along a vertical path (A) and filled continuously with the food product. The machine (1) has gripping means (13, 14) for gripping the tube (3) at equally spaced cross sections (15); and sealing means (23, 24; 34, 35) for sealing the packaging material of the tube (3) along the cross sections (15), and in turn having a first and a second sealing device (23, 24; 34, 35) forming part of respective distinct, successive units (10, 20) of the machine (1). The first sealing device (23, 24) interacts with the cross sections (15) of the tube (3) for a time (T1) shorter than the time (T) required to achieve complete sealing of the cross sections (15), but sufficient to form respective temporary aseptic transverse sealing bands (25); and the second sealing device (34, 35) interacts with said temporary sealing bands (25) to seal them completely. (FIGS. 1 and 2)
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