| 摘要 |
The invention concerns a plastics closure comprising a lower part (1) and an upper part (2) connected to each other by a main hinge (3). Located on the closure are tensioning elements (8) whose length varies under the action of a tensile force, thus producing the required snap effect. The tensioning elements (8) are disposed in planes extending between their attachment points (4, 5). Each tensioning element is made up of several sections (10) which produce the change in length. These sections can be C, U or O-shaped. The tensioning elements (8) permit a maximum change in length of about 10-50 %.
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