Claims
- 1. A process for making a closure device for a packaging container comprising the steps of:
- forming, by injection molding, an outer layer including an annular outer portion defining an outer periphery of said closure device and an easy-openable device integrally attached thereto, said easy-openable device having a grip in the shape of a pull ring and said easy-openable device and said annular outer portion being joined in the proximity of at least one tearing denotation extending circumferentially around said annular outer portion spaced inwardly from said outer periphery thereof, said outer layer including said annular outer portion and said integrally attached easy-openable device defining a central region having said grip arranged therein;
- and welding an inner layer to both said annular outer portion and said integrally attached easy-openable device, said inner layer having a surface exposed to the environment through said central region.
- 2. The process of claim 1, including welding said inner layer to said outer layer by high frequency welding.
- 3. The process of claim 1, including welding said inner layer to said outer layer by induction welding.
- 4. The process of claim 1 including forming said easy-openable device to include a connection portion connected at a first end to said grip and connected at a second end to a narrow annular shaped member, whereby said member, said connection portion, and said grip are removable together with said inner layer, along a line defined by the circumferentially tearing denotation.
- 5. The process of claim 4 including forming a second short tearing denotation on said annular shaped member merging into said circumferential tearing denotation.
- 6. The process of claim 5 including forming said outer layer with an upper enlarged edge against which a reclosable cover is dismountably attached.
- 7. The process of claim 1, wherein said inner layer is selected from the group consisting of high barrier plastics and plastic coated metal foil.
- 8. The process of claim 1 wherein said outer layer is composed of a thermoplastic material.
Priority Claims (1)
| Number |
Date |
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| 8800518 |
Feb 1988 |
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FIELD OF THE INVENTION
This is a division, of application Ser. No. 07/414,740, filed Sep. 28, 1989, which is a continuation of Ser. No. 07/309,076 filed Feb. 10, 1989, now abandoned.
The present invention relates to a closure device for a packaging container and more precisely a closure of the so called easy openable type where the closure also allows reclosing of the container without a substantial addition of costs.
Frequently, there exists a problem of making a container closure having an exterior which looks rigid and strong, but which is easy-openable and, additionally, reclosable. Considering the fact that packaging containers and the closures thereof are extremely price-sensitive, it is realized that the problem by no means has an obvious solution.
The prior art within the actual field is full of various solutions of the easy-opening problem and to a certain degree also the problem of reclosing, but according to the knowledge of the applicant, so far, there has not been disclosed a closure structure which meets all three criteria just mentioned.
Thus, the object of the present invention is to provide a closure device meeting the stipulations and which additionally follows a more general structure philosophy developed together with this specific problem solution.
The present invention provides a closure device for a packaging container, comprising an outer layer having an easyopening device having a grip and at least a tearing denotation extending circumferentially around the closure device, and an inner layer attached to the outer layer at least at both sides of the tearing denotation.
The closure device is characterized in that the outer layer covers the inner layer only partially and leaves a central part having the inner layer exposed to the environment, that said grip has the shape of a pull-ring and is arranged at said central part, and that a connection portion interconnects the ring and a relatively seen narrow, ring shaped part of the outer layer, said part being removable together with the inner layer along a line defined by said circumferential tearing denotation.
In a preferred embodiment the connection portion is crossed by a further, short tearing denotation which merges with the said tearing denotation.
Preferably, the relatively narrow part of the outer layer merges into a rim diverging outwardly and defined by said first tearing denotation.
In one embodiment the rim has an enlarged upper edge against which a reclosable cover is demountably attachable.
US Referenced Citations (8)
Divisions (1)
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Number |
Date |
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| Parent |
414740 |
Sep 1989 |
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Continuations (1)
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Number |
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| Parent |
309076 |
Feb 1989 |
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Patent Grant
5114507
