| 摘要 |
<p>A method of detecting metallic foreign bodies in products (4) contained within a wrapper having a metallic coating is characterised in that the metallic coating (3) is constructed to have discontinuities (6) to thereby enable any metallic foreign body (5) to be detected through the metallic coating, such discontinuities being typically in the form of either corrugations in the film or gaps in the metallic coating.</p> |
