Composite lid for containers

Abstract

A composite lid for a container that includes a tubular body carrying an annular upper wall made of sheet metal, in which is defined an opening surrounded by a seat, which is configured to receive and retain the lid. The lid includes a base portion peripherally incorporating a retention portion to be seated and retained on the seat when the lid is closed. The base portion includes a peripheral annular element molded in a plastic material as a single piece with the retention portion, and a central element in the form of a sheet metal plate that has an outer peripheral edge attached to the peripheral annular element. The peripheral annular element includes, internally and in a single piece, a central panel disposed on the central element, which is incorporated to the lid during its injection or attached thereto afterwards.

Description

FIELD OF THE INVENTION[0001]The present invention refers to a lid formed of multiple materials, more particularly in sheet metal and in plastic material, to be applied to a container generally defined by a can with a circular or polygonal cross-section, obtained in sheet metal or in other materials, comprising a tubular body carrying an annular upper wall, which defines an access opening to the interior of the container and a seat on which the lid is removably fitted and retained, for closing the container.PRIOR ART[0002]There are well known from the prior art the lids of cans or other similar containers, said lids being constructed in a single piece in stamped sheet metal or molded plastic material and presenting a base portion, which covers the opening of the container and peripherally incorporates a retention portion to be seated and retained on the seat, when the lid is closed.[0003]The lids formed in stamped sheet metal are generally deprived of a tamper evident seal portion, w...

AI Technical Summary

Benefits of technology

[0011]As a function of the limitations and drawbacks of the prior art composite lids, when related to the containers of the type considered herein, it is an object of the present invention to provide a lid in sheet metal and in plastic material, presenting an improvement in the impermeability to oxygen (and other gases) and light barrier, in relation to the lids formed only in plastic material, through a simple construction which is less costly than that of the known composite lids incorporating or not a tamper evident seal.

[0013]It is also a further object of the invention to provide a lid as defined above and which allows safely stacking the containers closed by said lids.

[0017]The lid formed according to the present invention has practically its whole area, designed for closing the container opening, defined by an opaque sheet metal plate being gas impermeable and with an extremely less production cost, allowing the retention portion in plastic material to operate as a sealing element, in cooperation with the seat, and as an element for axially retaining the lid to the tubular body of the container.

Problems solved by technology

However, the plastic-molded lids can present some limitations, in certain applications, regarding the gas and vapor impermeability, particularly during long shelf periods, and also the formation of an effective light barrier.

None of the solutions of metallic lid or plastic lid permit solving the problem of discarding the median scrap resulting from the stamping of the annular upper wall of the container.

These solutions present a relatively complex and onerous construction, not being applicable to lids to be fitted and retained on a seat defined on an annular upper wall of the container.

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