Receptacles – Closures – With closure opening arrangements for means
Patent
1985-01-07
1985-12-03
Hall, George T.
Receptacles
Closures
With closure opening arrangements for means
220270, 220258, B65D 1740
Patent
active
045561524
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an opening means for containers, especially powder proof, liquid proof or gas proof containers of the type which at least at one end is closed by means of an end sealing providing an openable end panel which for instance by a sealing edge is sealingly connected to the container.
The invention has been made especially in connection to the development of a tin like container of cardboard having an inner end sealing, and in which both the container sleeve and the end sealing on the meating surfaces are formed with a weldable material, especially a plastic material, and in which the end sealing is liquid proof or gas proof connected to the container sleeve by means of ultrasonic or high frequence welding. It is, however, obvious that the invention is useful for many other types of container which are powder proof, liquid proof or gas proof, whether or not the material of the container sleeve or the end sealing is cardboard, plastic, sheet metal or any other material.
The container sleeve preferably should be made of a relatively stiff material whereas the end sealing may be stiff or easily foldable having a body of cardboard, stiff or soft plastic, paper parchment or any other suitable mmaterial. In order to make it possible to open the end sealing in containers of the above mentioned type the container sleeve and the end sealing used to be formed, so that the opening is made in that the end sealing is cut through by means of a tool, preferably close to the container sleeve. For cutting the end sealing through there is a need of supply for the said tool, it may be difficult to cut through certain materials, generally a rough opening edge is obtained, and the upper edge of the container gets a reduced stability in that the interconnecting end sealing is completely removed.
For making it more easy to open the container it has been suggested that the end sealing is formed with a tear open means, for instance a wire of a material having a sufficient tearing strength and which when being torn is cutting the end sealing through thereby opening the container. Such wires must be formed so that the cutting through of the end sealing is made continuous adjacent the wall surface of the container sleeve by tearing the wire in the clockwise or the counter clockwise direction. Such a tearing open of the end sealing may be hard or difficult. The tearing wire or the tearing strip also may brake during the tearing operation. The tear open means generally is formed for right-handed people and provides problem for left-handed people, it often gives a rough and uneven tearing edge, and the manufacture of the tear open means generally involves a complicated and expensive manufacturing step in the manufacture of the container. A special type of tear open means is known from our own U.S. Pat. No. 3,776,450, in which the end sealing comprises two foils of a plastic material especially a laminated luminum plastic material, in which the foils are substantially the same type, and in which the upper foil is punched through, both to provide a handle tongue and for providing an even tearing edge and in which the lower foil is punched through to provide an arrow point like formation intended to provide a tearing start point, and in which the lower foil is welded to the upper foil round the tearing line extending round the upper foil and round the arrow point like tearing start point of the lower foil.
Such an end sealing having a tear open means allows a simple opening of the container by tearing off the combined plastic foils, and generally it gives an even tearing edge. Also this type of tear open means, however, is only adapte to right-handed people or alternatively to lefthanded people and depending on the rather complicated punchings of the two foils and the welding together thereof it is complicated and rather expensive to manufacture.
All of the above mentioned previously known tear open means are formed so that the tearing wire or any other tear open assisting means must be glued or welded to the end
REFERENCES:
patent: 3159303 (1964-12-01), Betner
patent: 3195763 (1965-07-01), Fried et al.
patent: 3220599 (1965-11-01), Fried et al.
patent: 4513876 (1985-04-01), Buchner
Esselte Pac Aktiebolag
Hall George T.
Nilles James E.
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