| 摘要 |
<p>The invention concerns a method of verifying that a packet or container (6) is unruptured so that no one has been able to introduce harmful or irrelevant substances in it after manufacture and sealing the packet or container. The invention also permits verification that a sealed packet or container is hermetically sealed and does not leak. This is for example carried out by disposing a marking device gas impermeably against the packet or container and having the marking device provide an indication if the packet or container (6) becomes damaged. The marking device can for example consist of a label (9) which is discoloured in consequence of air contacting the label or of a label which if desired may be provided with a bar code which may change and which is disposed on the packet or container. The change can for example consist in that the label and/or bar code changes colour or that the bar code is supplemented with a warning bar.</p> |
