| 摘要 |
Disclosed is a process for the preparation of cans which comprises pressing a flexible lid comprising an aluminum foil as a substrate and a heat-sealable resin layer formed on the surface thereof to a metallic can body being formed of a surface-treated ferromagnetic steel plate and having a curl on the edge of an opening in such a positional relation that the curl portion of the can body confronts the resin layer of the lid, and induction-heating the curl portion selectively by a high-frequency induction-heating coil located in the vicinity of the periphery of the curl portion to form a seal between the curl portion and the lid by heat-sealing. According to this process, the curl portion to be heat-sealed is selectively heated, and heat-sealing can be accomplished in a short time while preventing deterioration of a lacquer or sealant. A copolymer of ethylene with a carbonyl group-containing ethylenic monomer, especially an ethylene-vinyl acetate copolymer, which has the surface subjected to the corona discharge treatment, is used as the sealant. A canned provision is prepared by heat-sealing a sealing lid to the curl portion of a can body in the above-mentioned manner, packing a content into the lidded can body and double-seaming another lid to the flange portion of the can body.
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