| 摘要 |
<p>The sack has an outer wall that is closed by a flat material into a tubular shape with a longitudinal seam (6) and a plastic wall (1). The outer wall is folded by a paper wall (8) at one end. The plastic wall is partially formed of two plastic layers (7) having multiple perforations (2,3). The plastic layers are adhered to each other by a flat adhesion such that the plastic wall encloses the sack interior hermetically at atmospheric pressure, and are fixed and spaced apart from each other in the region of the perforations due to an overpressure.</p> |
