Receptacles – Closures – Removable closure retained by adhesive or fusion means
Patent
1986-06-03
1988-10-04
Pollard, Steven M.
Receptacles
Closures
Removable closure retained by adhesive or fusion means
220 23, 215232, B65D 4100
Patent
active
047750766
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a sealed package comprising a container having an opening and a cover which are made of a synthetic moulded, blowed or thermoformed material, the external faces of this container and this cover being made of a thermoplastic material and having cylindrical surfaces flushed to each other, and a flexible detachable strip sealed on said cylindrical surfaces to hold the cover on the container.
The invention also relates to a method for manufacturing of said package as well as to an utilization of the package obtained thereby.
The french patent application published under No. 2'267'946 describes a metallic box with a detachable cover sealed by an adhesive strip which assembles the cover and the container. The sealing thus obtained is very limited and does not satisfy with conditions of a long time preservation of damageable products such as food products, i.e. ready-cooked vegetables, dishes, etc... In the matter of long time preservation the requirements are particularly strict. The use of an adhesive strip to join the cover with container does not permit to meet these requirements.
The french patent published under No. 2'044'060 describes a package of synthetic material with a detachable cover sealed by a flexible adhesive strip closing the slit located between the cover and the container. As mentioned above an ordinary adhesive strip does not permit to reach requirements necessary to guarantee a long time preservation.
Among known sealed package the most recently developed ones comprise a rigid container made of a synthetique multilayer thermoformed material wich represents a diffusion barrier against oxygen and steam and a cover wich is welded to a plane edge of the container. The cover is generally made of a flexible aluminum foil wich also comprises such a barrier, further encompassing a film of a heat sealable material which may be welded to the edge of the container. This type of package is often but not exclusively used to contain food in particular prepared dishes.
One of the drawbacks of such package is due to the fact that the cover may not be re-used after it has been pulled off the container and the package may therefore not be closed again after it had once been opened.
Another drawback of this type of package is the inevitable residue remaining attached to the container after its opening which inhibits the use of the opened container as a plate for direct consumption of the elements which are contained in the package.
A further drawback of this type of package is the low reliability of the annular welding seam along which the cover is fixed to the container. The smallest deficiency of this member, due e.g. to a particle or a fiber of the food crossing said welding zone, constitutes a weak point of said closure risking an eventually dangerous contamination of the products contained in the package.
Moreover the cover is relatively weak and the risks of cracks during storage or manipulation are not negligeable. This disadvantage is particularly important for a container made of a flexible aluminum foil comprising a film of a heat sealable material.
This last drawback has been overcome by the substitution of the cover consisting of heat sealable aluminum by a cover which is made of a gas tight synthetic multilayer heat formable material which is thick and rigid enough to resist shocks and considerable pressures. However these covers need a longer time to be welded to the plane edge of the container and this opening which is more difficult may be achieved only by means of special tools.
Moreover and particularly for flexible foil type covers they can not be used as plates nor may they be reutilized and the welding zone does not always represent the desired reliability to shield the contents of the package againts all kinds of contamination as mentioned before
The present invention eliminates all these different drawbacks by providing a sealed package of simple concept conceived for economical manufacture in large series and which may be re-used after its opening for a differen
REFERENCES:
patent: 2629534 (1953-02-01), Reynolds
patent: 3070275 (1962-12-01), Bostrom
patent: 3244306 (1966-04-01), Stolk
patent: 3437257 (1969-04-01), Bua
patent: 3447711 (1969-06-01), Bozek
patent: 3997056 (1976-12-01), Mueller
patent: 4009793 (1977-03-01), Minesinger et al.
Cod Inter Techniques S.A.
Pollard Steven M.
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