JPH02282043A - Packing vessel - Google Patents

Abstract

PURPOSE: To enclose a packing container by a simple and speedy method and to provide said container with a greater tightness and durability by having an outer cover elongated piece connected to an end wall. CONSTITUTION: An elongated outer cover piece 5 and an end wall 3 are made of a material having at least one outer coating comprising a metallic layer and plastic capable of being welded. The most desirable and suitable sealing joint is obtained by a method wherein the elongated outer cover piece 5 and the end wall 3 are connected each other along the sealing joint formed by the surface fusion between each of the outer plastic coatings 8 and 10 which the elongated outer cover piece 5 and end wall 3 are faced. More particularly, a sealing joint which functions well and can easily be controlled is formed when the elongated outer cover piece 5 and the end wall 3 are connected each other by induction-heating core metallic layers 6 and 9. This facilitates the opening and sealing of a packing container which has a sealing joint with mechanical durability and liquid tightness.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a non-returnable packaging container for liquids, in particular pressurized contents, comprising at least one flat end wall;
The present invention relates to an aperture provided in an end wall and an outer cover strip bonded to the outside of the end wall over the aperture.

In the packaging industry, stack-type non-returnable packaging containers are often used for packaging liquids, especially pressurized contents such as beer, soft drinks, and similar carbonated beverage products. . These known cylindrical can bodies include - in the shell a cylindrical can body provided with a bottom wall, the upper end of which is joined to the cylindrical can body with a substantially flat end; Consists of something that is closed off by a wall. The cylindrical can body is generally made of plastic deck or of metal, for example iron or aluminium, while the flat end wall essentially always consists of sheet aluminum.

To facilitate opening of the packaging container, the packaging container is almost always provided with some form of opening means,
On the one hand, provision is made to make it possible to easily open the packaging container, and on the other hand, to make it possible to smoothly empty the contents of the opened packaging container.

A very common known opening means for opening such known type packaging containers is a weakened or opening part located in the flat end wall, which can be completely peeled off by a tension ring connected thereto. It has an opening adapted to expose an opening through which the contents of the packaging container can be removed. One problem often encountered with this inherently simple, and in most cases well-functioning, piercing means is that the pierceable end wall is made of a relatively soft material, preferably aluminium. Although soft and easy to process, from a manufacturing point of view it must be made from a very high energy consuming metal and therefore a high cost metal. Therefore, in order to manufacture packaging containers more economically, it is especially necessary to recover and reuse as much of the aluminum component of used packaging containers as possible. Such an attempt is frustrated or seriously hampered by the fact that the parts are most often jettisoned together with the tension ring and are therefore completely lost after one use.

In addition to the economic loss, furthermore, the dumped portion of the end wall continues to be left in the wild for an extremely long time until it degrades through corrosion, and throughout this period, its sharp edges pose a threat to humans and animals. cause harm.

Another opening means for punching known-form packaging containers of the type previously described is an opening in the end wall of the can body, with a cover elongated releasably coupled to the outside of the end wall. Consisting of a piece covered by a piece or similar closure device. Although this known opening means is also relatively simple, easily fabricated and in principle works well, it is especially important in the case of pile-form packaging for pressurized contents to cover the strips. It is particularly disadvantageous in that it requires adhesives, which are environmentally questionable and expensive, in order to establish a seam of the required thickness and durability between the packaging container end wall and the packaging container end wall.

According to the present invention, the disadvantages mentioned above can be solved by
A packaging container of the type described at the beginning of the preamble is provided in which the cover strip and the end wall are formed from a material having at least one outer coating consisting of a metal layer and a weldable plastic, and wherein said cover strip has an opening. along a sealing seam surrounding the entire mouth which is liquid-tight but can be breached and formed by surface fusion of the respective plastic coatings facing each other on the surface of said cover strip and end wall; and being coupled to the end wall.

According to a particularly preferred embodiment of the invention, the sealing seam between the cover strip and the end wall of the packaging container is of a metal layer which is known per se and is incorporated into the cover strip and the end wall, respectively. With such induction heating, the packaging container can be closed in a quick and simple manner and the actual opening process can be monitored both with respect to heating time and temperature; It has been found that a sealed seam provides greater tightness and durability than, for example, adhesive bonding.

Other preferred embodiments and advantages of the invention are further characterized by the features specified in the dependent claims.

The invention will be explained in more detail below with reference to the accompanying drawings.

3. Although the present invention can be applied to all mountain-type packaging containers,
In the particular embodiment referred to herein, the packaging container, generally designated 1, is of the type shown in FIG. 1 and has an upwardly tapering can body 2.
The can body 2 is configured to have any type of bottom closure means and a substantially flat end wall 3 located at the upper ltl end of the can body 2. Said end wall 3 has a preformed aperture 4. The opening 4 is closed at the top by an outer cover strip 5 and the force bar 1III strip 5 is connected to the outer surface of the end wall 3. Outer cover strip 5
has, on the one hand, an attachment portion 5a releasably connected to the end wall 3 over said aperture 4, and furthermore, on the other hand, by means of which the outer cover strip 5 covers the aperture of the packaging container. It has an easily accessible gripping part 5b which is adapted to be peeled off when doing so.

As is even clearer from FIG. 2, said outer cover strip 5 is manufactured from a laminated material, said laminated material 5 comprising a central metal JIJ6 of a tensile-resistant material, for example iron, and a weldable plastic, For example, it has an outer coating 7.8 of polyester (preferably polyethylene terephthalate). FIG. 2 generally shows that the end wall 3 is also made of a material having a central metal layer 9 with an outer coating 10 of a weldable plastic, for example polyester (preferably polyethylene terephthalate). @Wall 3 is a downwardly facing edge 3a serving as fastening means, extending continuously around the entire outer edge of end wall 3 and inserted at least partially inside can body 2 and against it. The edge portion of the end wall 3 has one secured along a liquid-tight mechanically durable sealing seam surrounding the entire such insertion.

As pointed out earlier, the seam between the outer cover strip 5 and the end wall 3 is, on the one hand, the pressure of the packaging container, which rises to a maximum of about 7 bar in the case of beer, soft drinks and similar carbonated drinks. While being strong enough to withstand internal pressures, on the other hand, the seams are such that intentional peeling off of the outer cover strip 5 when opening the packaging container is not possible or unnecessary. It is important not to be too hard on the throat. According to the present invention, the desired optimum seam is that the outer cover strip 5 and the end wall 3 meet each other along a sealed seam formed by surface fusion between the respective plastic outer coatings 8.10 facing each other. A seam obtained by being joined and which, in particular, functions well and can be easily controlled, is obtained if said outer cover strips 5 and 113 are respectively incorporated into them by induction heating of the central metal layer 6, 9. It has been discovered that if connected to each other, they can be formed.

Such induction sealing is quick and simple and can be implemented with the aid of existing conventional equipment. This method is particularly advantageous in that it can be easily monitored with respect to heating time and with regard to temperature, and therefore provides a mechanically durable sealing seam, which is liquid-tight but easily openable, around said opening 4. It has the advantage of being formed throughout.

The can body 2, which is preferably conical in shape as shown in FIGS. 1 and 2, also has a thin inner X-layer 11 and an outer coating consisting of at least a weldable plastic, preferably polyethylene terephthalate. 12 facing the interior of the packaging container, so that the inserted portion of the edge portion of the end wall 3 and the plastic outer coating 1 of the can body 2
The seam 1 between 2 and 1 can also be achieved by induction heating in a manner known per se.

The embodiment of the invention described above is only intended to illustrate one particularly preferred embodiment, and it goes without saying that numerous modifications may be made to the construction and general design of the packaging for this reason. It is possible within the scope of the inventive concept to realize this without departing from the practical idea of the invention.

[Brief explanation of drawings]

FIG. 1 shows a schematic perspective view of the top part of a packaging container provided with an opening according to the invention, and FIG. 2 shows a central sectional view of the container according to FIG. In the drawing, 1... Packaging container, 2... Can body, 3... End wall, 3a... Downward edge,
4... Opening, 5... Outer cover strip, 5a... Mounting part, 5b... Holding part,
6, 9... Central metal layer, 7, 10...
Outer coating, ding. 1... White metal layer,

Claims (7)

[Claims] (1) at least one end wall (3), an opening (4) provided in the end wall (3), and an end wall (4) covering the opening (4);
3), wherein said outer cover strip (5) and said end wall (3) have at least one layer of metal and a weldable plastic. said outer cover strip (5) is of a material having two outer coatings, said outer cover strip (5) is a sealed seam surrounding the entire aperture (4) and is liquid-tight but can be opened; characterized in that it is joined to said end wall (3) along what may be formed by surface fusion of the plastic outer coatings of each of said end walls (3) facing each other with a strip (5); packaging container. (2) A packaging container according to claim 1, in which the sealing seam is formed between the outer cover strip (5) and the end wall (3).
) Packaging container, characterized in that it is formed by induction heating of metal layers (6, 9) each incorporated in a metal layer (6, 9). (3) A packaging container according to claim 1 or 2, characterized in that the metal layer (9) of the end wall (3) is made of iron. (4) A packaging container according to any one of claims 1 to 3, characterized in that the metal layer (6) of the outer cover strip (5) is made of iron. packaging container. (5) A packaging container according to any one of claims 1 to 4, in which the plastic outer coating (7, 8, 10) consists of polyester, preferably polyethylene terephthalate. A packaging container characterized by: (6) A packaging container according to any one of claims 1 to 5, in which the end wall (3) has a downward edge (3a) serving as a fixing means. Characteristic packaging containers. (7) In the packaging container according to claim 6,
The downward edge of said end wall (3) is at least partially inserted within and sealingly secured against the upper end of an upwardly tapering container body (2) provided with a bottom wall. A packaging container characterized by: