| 摘要 |
<p>A heatable sealing head includes resilient, yielding cup springs which transmit pressure and heat to a thin cover insertable between the sealing head and the container rim. This cover, which may be metallic and is coated on the underside with a thermoplastic material, is thereby deformed about portions of the container rim. The cup springs are disposed conically in their relaxed state so that their radially outer portions are situated closer to the cover than their radially inner portions, by which they are fixed to the sealing head. For increasing the flexibility of the cup springs, a spacer piece is inserted between an outer cup spring facing the cover and at least one cup spring nearer the sealing head in order to keep the radially inner portions of these two cup springs spaced from one another while leaving a clearance space between the radially outer portions of the spaced cup springs.</p> |
