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US 3,946,872 AGranted
Sealable and sterilizable package
AssigneeAlcan Aluminum Corporation
InventorWinfried Gerhard Sturm
Life of this patent
Estimating the term…
Abstract
A package made of metal foil or light-gauge sheet, having a bottom and lid each lined internally with a lacquer and heat-sealed together by means of the lacquer to provide a sealed, sterilizable, shelf-stable container for food or the like, which does not require refrigeration for storage. The lid is manually peelable from the bottom, with defoliation of the lid lining along the locality of the seal, providing a neat and attractive appearance for the opened container. Specifically different vinyl resin based lacquer systems may be employed for the bottom and lid linings.
Claims17
A sterilizable, shelf-stable, easily openable package comprising:
- a. a light-gauge sheet metal bottom having an inner surface defining a receptacle for material to be packed and a continuous peripheral rim;
- b. a first lining of thermoplastic material extending over, and adhering to, the entire inner surface of said bottom including said rim;
- c. a light-gauge sheet metal lid extending over said bottom and having a peripheral edge portion continuously overlying said rim;
- d. a second lining of thermoplastic material extending over, and adhering to, the entire surface of said lid facing said bottom, including the peripheral edge portion thereof,
- e. said second lining adjacent said peripheral edge portion being in continuous contact with, and sealed to, the portion of said first lining at said rim, around the entire periphery of the package;
- f. each of said linings consisting essentially of the cured product of a vinyl resin based lacquer composition which is resistant to attack by food acids and salt and has a melting range above about 125.degree. C and which forms with the other lining a seal that parts by defoliation from the lid when the lid is peeled manually from the bottom,
- g. said linings being respectively constituted of different compositions having respectively different bond strengths such that the second lining peels more readily from the lid than the first lining peels from the bottom.
4 more elements
A package comprising:
- a. a light-gauge sheet metal bottom having an inner surface defining a receptacle for material to be packed and a continuous peripheral rim;
- b. a first lining extending over and adhering to the entire inner surface of said package, said first lining consisting essentially of the cured product of a first lacquer composition comprising a mixture of vinyl and epoxy resins and a linking compound in a solvent;
- c. a light-gauge sheet metal lid extending over said bottom and having a peripheral edge portion continuously overlying said rim;
- and
- d. a second lining of thermoplastic material extending over, and adhering to, the entire surface of said lid facing said bottom, including the peripheral edge portion thereof, said second lining consisting essentially of the cured product of a second lacquer composition comprising a mixture of vinyl and acrylic resins in a solvent;
- e. said second lining adjacent said peripheral edge portion being in continuous contact with, and sealed to, the portion of said first lining at said rim, around the entire periphery of the package.
3 more elements
A sterilizable, easily openable package comprising:
- a. a light-gauge sheet metal bottom having an inner surface defining a receptacle for material to be packed and a continuous peripheral rim;
- b. a first lining of thermoplastic material extending over, and adhering to, the entire inner surface of said bottom including said rim;
- c. a light-gauge sheet metal lid extending over said bottom and having a peripheral edge portion continuously overlying said rim;
- d. a second lining of thermoplastic material extending over, and adhering to, the entire surface of said lid facing said bottom, including the peripheral edge portion thereof,
- e. said second lining at said peripheral edge portion being in continuous contact with, and sealed to, the portion of said first lining at said rim, around the entire periphery of the package;
- f. said first lining being a lining of polypropylene;
- and
- g. said second lining consisting essentially of the cured product of a lacquer composition comprising low molecular weight polypropylene resin.
5 more elements
Dependencies are inferred from the claim text.