| 摘要 |
The sealing structure (S) for a container (C) provided with an opening (O) comprises a sheet (F) welded around the edge of the opening, this sheet (F) consisting of at least three layers, namely a welding layer (1) pressed against and welded as a bead (4) to the edge of the opening, a barrier-forming exterior layer (2) and an intermediate adhesive layer (3); the weld between the bead (4) of the welding layer (1) and the edge of the opening has a tear strength greater than the strength of adhesion between the welding layer (1) and the adhesive layer (3) so that, at the first occasion of exposing the opening (O), the welded bead (4) remains in place around the edge of the opening and separates from the rest of the welding layer (1) and from the adhesive layer (3), which adhesive layer is thus uncovered over an area (7) and makes it possible, by pressing again against the bead (4), to seal the container (C) again.
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