| 摘要 |
A perforation (3) is provided at one or more positions on the envelope (1) or package (2), forming a tear-open point. There are tear-resistant portions formed by wire, string, sheet material etc. on the inside of the package material. When the wire is pulled in the opening direction, opening takes place at the tear-open point (4), or a fold line (8) etc. The perforation can run all the way round the package, allowing it to be opened completely. Opening can be by a roller, onto which reinforced material winds
|
