| 摘要 |
The invention relates to the shelf stable packaging of perishable liquid food products in hermetically sealed gable top cartons (13) rendered easily openable to the user. The carton is rendered easy to open by sealing it with patterned jaws (Fig. 7, 9, 10, 11 and 12) which apply sufficient pressure to achieve a strong seal along a horizontal stake line (22), vertical stake lines (21 and 21a) and a center stake point (70). The center stake point (70) being optionally located close to the upper edge of the end flaps (20) so as to leave the area (26) of the intersection of the end flaps (20) and side flaps (19) at the horizontal fold line (27) substantially unsealed. A suitable jaw (Fig. 11) for rendering the carton easy to open includes a horizontal rib (43) to form a horizontal stake line, at least one vertical rib (44) to form a vertical stake line and a center stake (471) located to provide a center stake point immediately below the upper edge of the end flaps (20) at the gap (29) but well above area (26). |
