Lid particularly for foodstuff containers and process used...

Details Lid particularly for foodstuff containers and process used... Lid particularly for foodstuff containers and process used...

1997-10-14

2001-02-06

Ahmad, Nasser (Department: 1772)

Stock material or miscellaneous articles

Circular sheet or circular blank

C040S311000, C215S230000, C215S341000, C215S347000, C428S066300, C428S066400, C428S066500, C428S066700

Reexamination Certificate

active

06183827

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a lid, as it is generally known, for foodstuff containers, in particular for use in prize competitions in which an inscription is placed on the inside of the lid.
In particular, it should be noticed that the lid concerned may be used to seal glass bottles designed to contain liquid foodstuffs, under pressure or not, which may or may not undergo heat treatment. In such cases, the said lid is a crown cap which guarantees the seal between the air and the container. More precisely, the cap in question has a removable PVC—free seal with an inscription on the side which faces the bottom of the lid. PVC—free means those materials which do not contain polyvinyl chloride, the use of which continues to be reduced, especially in Northern European countries. The afore-mentioned internal inscription makes the lids particularly suitable for use in prize competitions.
BACKGROUND ART
At present, in accordance with the prior art and for particular commercial requirements, three different types of caps suitable for prize competitions are used.
The first type consists of a cap in the form of a metallic shell, the internal side having a bottom upon which an opaque PVC seal is applied after treatment with adhesive paint. Given its affinity with the paint, the said seal is easily detached, so that an inscription present on the bottom of the cap can be read.
The second type of cap, again having an opaque PVC seal, differs from the first in that the inscription is made in such a way that it is transferred from the shell to the seal itself: therefore, this type of cap is ideal for use when the seal must be used as proof of a win, since it is easier to send a seal rather than the entire cap.
The third type of cap has a transparent seal (PVC or PVC—free) which cannot be detached from the bottom of the cap. There is an inscription on the bottom of the cap itself, clearly visible through the seal. However, this cap is impractical for use in prize competitions, since the entire cap is required as proof of a win, being less convenient than the second type of cap, since, as already indicated, it is easier to post a seal than a cap. A further disadvantage of this third type of cap is that a sufficiently opaque bottle is required, to prevent the inscription being read from the outside of the bottle.
None of the three types of PVC-based crown caps made according to the prior art can be marketed in those states in which the law forbids the use of PVC crown caps.
To comply with such regulations and requirements and, at the same time, obtain a cap which has an easily detachable PVC—free seal, a new technology designed to control the adhesion of the PVC—free material to the cap is needed.
DISCLOSURE OF THE INVENTION
The main object of the present invention is to overcome the afore-mentioned disadvantages of the known types of caps, by providing a cap with a PVC—free seal which, if necessary, can easily be detached from the bottom of the lid shell.
A further aim of the present invention is to create an inscription which is easily and clearly transferable to the seal, without the seal adhering to the adhesive paint spread on the bottom of the lid, using a process which is able to control the adhesion of the seal to the shell of the lid.
Another aim of the present invention is to provide a simple, reliable operating process.


REFERENCES:
patent: 4835035 (1989-05-01), Bayer
patent: 1 504 751 (1978-03-01), None
patent: 1 515 479 (1978-06-01), None
patent: 2 001 079 (1979-01-01), None
patent: 58 083033 (1983-05-01), None
patent: 6-247467 (1994-09-01), None

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