| 摘要 |
<p>The packaging unit made of at least one foldable blank of a flat material such as paper, cardboard and plastics, in particular, for transport and storage of sheet-formed materials and printed matter, incorporates an opening allowing a pressure to be exerted on its contents. As a result, a part of the contents forced through an opening on the opposite side of the packaging unit can be extracted from it.</p> |
