Envelopes – wrappers – and paperboard boxes – Paperboard box – With closure for an access opening
Patent
1988-07-15
1989-04-11
Garbe, Stephen P.
Envelopes, wrappers, and paperboard boxes
Paperboard box
With closure for an access opening
220359, 229 55, B65D 4302, B65D 4308
Patent
active
048198633
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a fluid-tight sealed container with a lid, made from plastic, plastic coated cardboard, or the like, the container side walls in the opening plane being terminated with a narrow rim and said lid being placed sealingly over the container opening. The invention relates to containers and lids of the disposable kind as well as to containers the lids of which are intended for repeated application.
In case of containers intended for foodstuffs, e.g. dairy products, it is essential both in view of the durability of the contents and of transport that the containers are completely closed or sealed, and it is equally important that the containers may be easily opened. Since such products are mass produced it is also essential that container production is possible with maximum simplicity and at minimum cost. This especially applies to disposable containers the entire content of which is used all at once. However, the same demands are made to a large extent on containers the content of which is not used all at once and where it is desirable to put on the lid repeatedly.
It proved difficult in practice to meet all these demands in one container. Either the lid is sealed so well that it is difficult to open the container, or the container was not sufficiently tight before it was opened. In case of inexpensive container/lid combinations the user is sometimes faced with the problem that it is impossible to place the lid on the container in a satisfactory manner after the container had been opened the first time.
It is, thus, an object of the present invention to provide a container with a lid that complies with all above-mentioned requirements.
This object is achieved by a container of the kind mentioned above that is characterized by the features stated in the claims.
In connection with the present invention a special composition of materials in the lid was combined with a deliberate utilization of the "sharp" edge of the container opening. It was, thus, possible by suitably adjusting parameters to achieve a seal that is tight and stable during transport and storage, but which is easily torn up without destruction of the rim portions or the lid, enabling removing of the content in a cleanly and simple manner. Also, a lid intended for repeated use may be replaced although no tight seal is obtained upon replacement.
There are many possible embodiments within the scope of this inventive concept. It is, thus, possible only to coat the contact surface area of the lid with the container edge with a flowable polymer composition that will provide the desirable properties. On the other hand, the entire lid may, if desired, be coated with such a material which may e.g. be laminated onto the lid material during lid production. If desired and suitable the entire container may be produced from such a material or its inner surface may be coated with such a material, respectively. If the lid is produced in a disposable form, production may be maximum simple and inexpensive, said lid being shaped as a plane surface that may be torn from one of the lid end edges. A lid intended for repeated use is provided with a vertical flange for insertion into the container opening or for being pushed over said container opening, respectively. In both cases said flange is provided with guide bosses which will also ensure stability of the container shape. The inventive concept may be utilized regardless of the shape of the container but it will be especially advantageous with quadrangular containers with a lid for repeated use.
In the following the invention will be disclosed in more detail with reference to embodiments shown in the drawings, where
FIG. 1 shows a disposable container in perspective.
FIG. 2 is a section along line II--II in FIG. 1 of the container according to FIG. 1.
FIG. 3 shows a container, e.g. for yoghurt, with a lid that is intended for repeated use according to another embodiment of the invention, said lid being shown in a somewhat lifted position in perspective.
FIG. 4 is an elevation of the lid
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Elkins Gary E.
Elopak A/S
Garbe Stephen P.
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