Envelopes – wrappers – and paperboard boxes – Paperboard box – End structure
Patent
1992-04-22
1993-08-17
Elkins, Gary E.
Envelopes, wrappers, and paperboard boxes
Paperboard box
End structure
2291232, 229201, 229242, B65D 326, B65D 330
Patent
active
052361209
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a container comprising a container body made of a paperboard-based material and comprising a top opening at one end and a bottom opening at the other end; a bottom closing the bottom opening; and a lid for closing the top opening of the container body.
If the body of the container of the type described above is made of liquid packaging paperboard, such a container can be used, for instance, for packaging various products to be spooned out, such as ice-cream, yoghurt and pudding. In containers intended for products to be spooned out, the lid should be relatively easily and at least substantially completely detachable. Normally, this is realized in such a way that the body of the container comprises an outwardly projecting flange to the upper surface of which an even lid material is seamed. This kind of container, however, requires a relatively large space as compared with its useful volume. U.S. Pat. No. 4,261,502 and FI Published Specification 70826 disclose an alternative lid structure in which a round cup-like lid is inserted into the opening of the body and the edge area of the lid is heat-sealed to the inner surface of the body. This kind of lid is, however, rather difficult to open especially if it is to be detached completely. U.S. Pat. No. 4,261,502 also discloses a container comprising a conical body closed at the top with a lid made of aluminum foil. This container is formed by a conventional sector-shaped blank called a drink cup blank, and it requires about 15 to 20% more paperboard than a straight-walled container of equal volume. Above all, the space requirement of this kind of container is extremely great as compared with its useful volume. As the end edge of the body is positioned within the container, this container is not suitable for aseptic use.
The object of the present invention is to provide a container in which a lid which is easily detachable, also completely, can be attached to a body made of a paperboard-based material. This is achieved by means of a container of the invention, which is characterized in that an edge area around the top opening of the body comprises a continuous section having substantially the shape of a truncated cone and extending around and tapering towards the top opening, the generatrix of said body section being at an angle with the generatrix of the container body; and the lid comprises a section having substantially the shape of a truncated cone and the angle of taper of which substantially corresponds to that of the body section having the shape of a truncated cone, said lid section being attached detachably to said body section. By virtue of the shape of the sealing surface between the lid and the body, the lid is very easy to open as it can be subjected, e.g. by means of an opening tab formed peripherally in the lid, to a force the direction of which is extremely advantageous for the detachment of the lid from the body. As used in this application, the container body section having substantially the shape of a truncated cone refers to a body section which is at an angle with the main part of the body and one end of which is smaller in diameter than the other end. The shape of the ends, however, may vary: the ends can be round, oblong, rectangular with rounded corners or even more irregular in shape. Essential is that the container body section having the shape of a truncated cone comprises a continuous sealing surface extending around the top opening of the container for the lid.
The thickness of the container body section having the shape of a truncated cone can be equal to one or more material thicknesses of the body. Particularly advantageously, the thickness of the body section having the shape of a truncated cone is two or more times the material thickness of the body, whereby the edge of the body around the top opening is folded outwards upon the body. As a result, the edge of the top opening of the container is stiffened and, what is apparently even more important, the cut edge of the board, i.e. the so-called mill edge,
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Elkins Gary E.
Yhtyneet Paperithehtaat Oy
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