Container body of the composite type and container comprising sa

Details Container body of the composite type and container comprising sa Container body of the composite type and container comprising sa

1984-10-10

1986-05-13

Kittle, John E.

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

428344, 428355, 428461, 275232, B65D 1506

Patent

active

045886210

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to containers of the so-called composite type, that is to say, containers in which the bottom and/or top which is or are intended to provide a tight closure for the body of the container are made of a material different from that of the body. It relates, more particularly, to containers of this type whose body is internally provided with a polymer to which the bottom and/or top adhere.
Such composite containers are widely used in industry for the packaging of food products, for example.
The body of these containers, which may be of any shape whatever, usually comprises a foundation structure of single- or multi-ply paperboard which is covered on the inside with a multi-layer complex comprising, for example, a sheet of paper and/or a metallic film, a coat of glue and a film of a polymer such as high-density polyethylene, polypropylene, polyvinyl chloride, etc. The body of the container usually further comprises an outer covering in the form of an external layer adhering to the paperboard and capable of being decorated. This layer may consist of paper or of a paper-metal complex that is provided on its outside with a protective layer (a polymer coating or film).
The bottom and top are usually made of a metal such as aluminum or tinplate or of a composite material comprising a metallic layer facing the interior of the container. The metal surface may be treated or covered with protective products such as an epoxy coating.
The body of the container and its bottom, and after the composite container has been filled also its top, are usually joined to one another by crimping, glueing and/or welding.
The methods of fabricating the various parts of these containers are well known in the art, and both the bodies and the bottoms and tops generally have excellent technical characteristics, and in particular satisfactory corrosion resistance when the packaged products are not aggressive and the packaging conditions (temperature and pressure) are not too severe.
On the other hand, when these containers, after having been filled and hermetically sealed, are subjected to severe heat treatments, for example, to pasteurize or sterilize the packaged product, it is found that it is extremely difficult to maintain a satisfactory joint between body, bottom and top.
To overcome this drawback, it has already been proposed to coat the metal surface of the bottom and top with a polymer capable of being adhered, at the edges of the body of the container, to the polymer forming its inner layer.
However, this approach requires that the surfaces of the bottom and/or top be coated with a polymer, which adds to the cost of the container.
The present invention seeks to overcome this drawback by providing a composite container in which the bottom and the top will provide a tight, lasting closure for the body of the container even if the latter holds aggressive products or is subjected to severe pressure and temperature conditions, such as those prevailing in pasteurization or sterilization treatments.
To this end, the invention has as an embodiment a composite container body which is characterized in that the inner surface of the body, and optionally its outer surface and/or its edges, are covered with a multi-layer complex comprising a metallic film to which is adhered a layer of an adhesive such as at least one copolymer obtained by polymerization of a monoolefin and grafting with a monoethylenic carboxylic acid, optionally in admixture with a second compound selected, for example, from the group consisting of low-density polyethylene, high-density polyethylene, polypropylene, polyisobutylene, polystyrene, polyesters, copolymers of ethylene and acrylic acid, and paraffins and waxes derived from the refining of crude petroleum.
The invention further has as an embodiment a composite container comprising a body and a bottom and/or a top which are in direct contact with said body through a metallic portion, said container being characterized in that said body is of the type defined above and that said complex wi

REFERENCES:
patent: 3580464 (1971-05-01), Griffith
patent: 4250227 (1981-02-01), Claude et al.
patent: 4382127 (1983-05-01), Claude et al.
patent: 4398644 (1983-08-01), Claude et al.
patent: 4451526 (1984-05-01), Claude et al.

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