Receptacles – Closures – Removable closure retained by adhesive or fusion means
Patent
1991-06-04
1993-05-25
Shoap, Allan N.
Receptacles
Closures
Removable closure retained by adhesive or fusion means
220450, 220456, 220458, 229 35MF, 383113, 383116, 426126, B65D 4100
Patent
active
052132277
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a container having excellent preservability for content and heat-sealability. More specifically, the invention relates to a container having a tin layer exposed on the content-accommodating side of the container.
BACKGROUND ART
Conventional containers having hermetically sealing performance based upon heat sealing include a container with flange obtained by draw-molding a laminated material which consists of laminating a thermoplastic resin film on both surfaces of a metal foil or draw-molding a laminated material consisting of a lamination of a gas-barrier resin film and a thermoplastic resin, a cup with heat-sealable closure consisting of a flexible substrate obtained by laminating a thermoplastic resin film on both surfaces of a metal foil, and a retort pouch using a laminated material obtained by laminating a thermoplastic resin film on both surfaces of a metal foil or using a laminated material obtained by laminating a thermoplastic resin film on a gas-barrier resin film, and have been used for containing foods. After the contents are packed therein and sealed, the containers are usually heated for sterilization.
Despite the foods are packed in the containers and are hermetically sealed by heating followed by sterilization by heating, however, there remains a problem in that the foods are discolored or are oxidized to lose flavor due to oxygen in the air entrapped when the foods are packed, due to oxygen contained in the foods or due to active enzymes in the foods during the storage and, especially, as they are stored for extended periods of time no matter how excellent barrier properties the containers and closures exhibit.
DISCLOSURE OF THE INVENTION
The present invention is to solve the above-mentioned problem inherent in the conventional containers such as cups with closure and pouches that are hermetically sealed by heating, and its object is to provide a container that can be excellently sealed hermetically by heating and can be easily opened and that excellently preserves the content.
Another object of the present invention is to provide a container that enables the content such as food to be sterilized by heating and that by itself exhibits excellent gas-barrier property, oxygen shut-off property and sealing property upon heating, and that further works to prevent the content from being discolored or deteriorated by the residual oxygen or enzyme, making it possible to excellently preserve the content without losing flavor.
According to a first embodiment of the present invention, there is provided a container comprising a seamless container with flange which consists of a thermoplastic resin film and a tin-containing laminated material and which is so draw-molded that the resin film is on the outer surface side and the tin-containing laminated material is on the inner surface side and that the tin layer is exposed on the inner surface side, a flexible closure consisting of a laminated material of a gas-barrier substrate and protective resin layers covering the inner and outer surfaces thereof, and a sealed portion formed by heating via an acid-modified olefin resin layer that is interposed between the upper surface of the flange and the inner surface of the closure.
According to a second embodiment of the present invention, furthermore, there is provided a container in which the peripheral portions of the opposing laminated materials are sealed by heating and a portion for accommodating the content is formed between the opposing laminated materials, wherein at least either one of the opposing laminated materials is a tin-containing laminated material consisting of a thermoplastic resin outer surface protecting layer, a metal foil or a thin film of tin on the inner surface side of the container and a resin layer formed on the inner surface of the metal foil or thin film of tin, and the tin-containing laminated material has a resin layer that is porous and that permits tin to be partly exposed relative to the opposing laminated material.
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REFERENCES:
patent: 4436220 (1984-03-01), Simmons
patent: 4665309 (1987-05-01), Derbshire
patent: 4810541 (1989-03-01), Newman et al.
patent: 4915289 (1990-04-01), Hatano et al.
(A), 63-125151, May 1988, Japan.
Goryoda Toshio
Koyama Masayasu
Tanahashi Toshifumi
Yamaguchi Kanemichi
Shoap Allan N.
Stucker Nova
Toyo Seikan Kaisha Ltd.
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