| 摘要 |
A can capping method comprises the following operational stages: a film of thermoformable plastic material (9) is heated and placed on the upper portion (11) of a group of cans comprising at least one can (10 ), the film is made to adhere by mechanical means to the surface of said upper portion in correspondence with a closed line, to define a clos ed chamber in combination with said upper portion; the air is extracted from said chamber; the film surface is made to adhere completely t o said upper portion; that film portion adhering completely to the upper portion of the group of cans is separated from the rest of the fil m; said film being heated to a suitable temperature such that the film, on shrinking as a result of cooling, remains adhering to the surface o f said upper portion and retains its shape.
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