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AssigneeToyo Seikan Kaisha, Ltd.
InventorsHiroshi Ueno, Yasunori Miyamatsu, Masanori Aizawa, Yasuo Kaga, Kazuhisa Ishibashi
Estimating the term…
Disclosed is an easily openable vessel closure comprising a can end member having a preformed opening, an easily peelable opening piece which is applied to the outer side of the can end member so that the opening piece covers said opening and adheres closely to the peripheral portion of said opening, and a protecting covering layer formed to cover the cut edge of the opening of the can end member, wherein the protecting covering layer is formed of a thermoplastic resin having a heat bondability and the protecting covering layer includes a film layer heat-bonded to the inner and outer peripheral portions of the opening and a projecting cover heat-bonded to the cut edge of the opening integrally with said film layer, and said opening piece is heat-bonded to the can end member through the protecting covering layer located outside the can end member and said protecting covering layer is stuck closely to the cut edge of the opening so that when the opening piece is peeled, the protecting covering layer is left on the side of the can end member. This vessel closure is excellent in the seal reliability, corrosion resistance, flavor-retaining property and easy openability.
An easily openable vessel closure comprising a can end member having a preformed opening, an easily peelable opening piece which is applied to the outer side of the can end member so that the opening piece covers said opening and adheres closely to the peripheral portion of said opening, and a protecting covering layer formed to cover the cut edge of the opening of the can end member, wherein the protecting covering layer is formed of a thermoplastic resin having a heat bondability and the protecting covering layer includes film layers heat-bonded to the inner and outer peripheral portions of the openning and a projecting cover heat-bonded to the cut edge of the opening integrally with said film layers, and said opening piece is heat-bonded to the can end member through the protecting covering layer located outside the can end member and said protecting covering layer is stuck closely to the cut edge of the opening so that when the opening piece is peeled, the protecting covering layer is left on the side of the can end member.
A process for the preparation of easily openable vessel closures, which comprises in combination the steps of forming a laminate comprising a can end member and thermoplastic resin film layers heat-bonded to the inner and outer faces of the can end member, each film layer having an opening corresponding to an opening of the can end member, pushing the end portions of the thermoplastic resin layers in the molten state into the cut edge of the opening of the cut end member to form a projecting cover heat-bonded to the cut edge of the opening, and applying an opening piece on the outer face of the can end member to cover the opening of the can end member and heat-bonding the opening piece to the peripheral portion of said opening through said thermoplastic resin film layers.
A process for the preparation of easily openable vessel closures, which comprises in combination the steps of forming a laminate comprising a can end member and thermoplastic resin film layers heat-bonded to the inner and outer faces of the can end member, each of the inner and outer film layers having an opening corresponding to an opening formed on the can end member and the end portion of the one film layer being bent along the cut edge of the opening of the can end member, heat-bonding the bent portion of the film layer to the cut edge of the opening of the can end member and simultaneously integrating the end portions of both the film layers with each other by fusion bonding, and applying an opening piece to the outer face of the can end member to cover the opening of the can end member and heat-bonding the opening piece to the periphery of the opening of the can end member through said thermoplastic resin film layer.
Dependencies are inferred from the claim text.