| 摘要 |
<p>The sheath is folded to form the longitudinal edges and lateral folds of the bag and folded transversely to form a section giving the final bag. The folding line is the bottom line of the bag. The sheath is cross-cut at a distance from the folding line at least equal to the width of the bag. The longitudinal folding lines below the bottom line are cut open to form rectangular flaps. The two smaller flaps an folded inwards, the elongate front flap is folded on to the small flaps and the elongate black flap onto the front portion. The bottom of the bag is then closed by welding the front edge.</p> |
