Bottles and jars – Closures – Retained by bonding or adhesive means
Patent
1995-09-08
1997-09-23
Moy, Joseph M.
Bottles and jars
Closures
Retained by bonding or adhesive means
215347, 156233, B65D 5100
Patent
active
056695217
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a sealing cover for an opening of a container. The sealing cover includes a first foil that seals the opening of the container, a metallic foil, especially aluminum foil, disposed over the first foil, for the inductive sealing of the first foil on the edge of the opening, a removable sealing lid that is releasable secured (e.g., screwed) on the container, a releasable controlled adhesive layer between the first foil and the metallic foil that enables the metallic foil to be detached from the first foil after the sealing lid has been removed, and an elastic layer between the sealing lid and the metallic foil.
For several decades, plastic containers which are sealed with plastic screw closures have been sealed, in addition to the screw closures, with various inductive sealing discs disposed between closure and container opening. The original purpose of this additional sealing was to prevent the possibility of the liquids escaping during transport or storage of the container. After the unscrewing of the screw closure, the end consumer has to destroy the sealing layer additionally or on its own. In the last ten years, this kind of additional sealing has proved effective as a tamper seal, e.g., the end consumer can easily establish after opening the screw closure whether someone has handled the contents between the filter and him, and the filler and marketer have additional protection against attempted blackmail in the distribution system. Many different types of inductive sealing disc have evolved over the course of time for the various applications and are used in large numbers. The inductive sealing discs or tapes are manufactured separately. The sealing cover manufacturer (method of manufacture predominantly injection molding) inserts the discs into the cover, or punches the discs out of tape material, which are then pressed directly into the covers and bonded. The sealing lid with inserted inductive sealing disc is, for example, screwed down after the container has been filled. Thereafter, the sealed container passes through an inductive sealing zone. The inductive sealing is effected there. It is standard that with all the various composites that part of the composite is a metallic foil, in most cases an aluminum foil. The metallic foil functions during the induction process as an antenna for the induction current. The energy is converted in the metallic foil into heat, which transfers onto a sealing layer and thus brings about the inductive sealing.
The metallic foil is located above the sealing layer and is tailored to the respective material (plastics material) of the containers. An elastic layer is located above the metallic foil which ensures through the clamping pressure of the sealing lid a satisfactory pressing of the sealing layer against the container. This elastic layer is very often connected to the metallic foil by wax or other adhesives. During the inductive sealing process, the wax becomes a liquid and either diffuses into the specially configured elastic layer or additional paper layers are used. It is characteristic of all inductive sealing layers used to date that after the inductive sealing the metallic foil remains firmly connected to the sealing layer on the container.
The problem arises that the aluminum, which is used in the inductive sealing, after the opening of the container with destruction of the aluminum layer, remains on the edge of the container opening, and thus prevents recycling of the container.
A method of improving this problem with the prior art is given in U.S. Pat. No. 4,596,338 and EP 0 488 985 A1, under which the metallic foil detaches itself from the inductive sealing foil by means of a releasable intermediate layer.
This solution leads to the disadvantage, however, that the aluminum or the metallic foil, after the unscrewing or removal of the sealing cap, is contained in the latter. Although the container can now be disposed of and recycled, the sealing cap nevertheless still presents a problem in
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Trombach Horst
Wiening Heinz-Rudolf
Alfelder Kunststoffwerke Herm. Meyer GmbH
Moy Joseph M.
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