| 摘要 |
The plug has an aluminium seal for the thermal sealing to the container neck through heating by electromagnetic induction or ultrasounds. The plug is provided at its internal upper base with an annular wall having an inclined internal face which, during the thermal sealing and with the collaboration of the aluminium seal, forms on the external edge of the neck lip, the bevel which is intended to constitute an inclined perimetral surface in order to provide for the closure tightness.
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