Envelopes – wrappers – and paperboard boxes – Paperboard box – End structure
Patent
1991-07-24
1994-02-22
Shoap, Allan N.
Envelopes, wrappers, and paperboard boxes
Paperboard box
End structure
220615, 220620, B65D 314
Patent
active
052880109
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a package comprising a substantially cylindrical body part consisting mainly of cardboard; a substantially round closing part consisting mainly of cardboard at both ends of the body part, the closing part being attached to the end of the body part by passing it within the end of the body part while an edge portion in the closing part, turned substantially perpendicular to the plane of the closing part, projects away from the body part and by turning an end portion of the body part over the edge portion of the closing part; and a closing ring fitted within the end of the body part.
Packages having at least one end manufactured as described above have previously been used only for the packing of dry substances, such as spices and baking powder. When the package is made of a liquid packing cardboard, such as plastic laminated cardboard, the closing parts can be heat sealed to the body part when the end portions of the body part are turned over the edge portions of the closing parts. In this way the package becomes liquid-tight. However, the poor strength of the joint of the closing parts makes this package unsuitable for use with more or less pressurized liquids. Nor does the prior art disclose any other packages consisting mainly of cardboard for pressurized liquids, not even with pressures as low as a few bars.
The object of the present invention is to provide a cylindrical package of the type described above to achieve a package for liquids, particularly for liquids containing components, such as carbon dioxide, which create a low pressure within the package.
The package of the invention is characterized in that the closing ring comprises a bead which is arranged to be inserted between the end portion of the body part and the closing part and which comprises on the side of the closing part a surface the normal of which intersects the longitudinal axis of the body part.
The rounded surface of the bead of the closing ring causes the pressure prevailing inside the package and tending to open the seam between the closing part and the body part to press the closing ring outward more and more tightly against the turned edge portions of the closing parts and the body part, thus strengthening the joint between the closing parts and the body part. On the other hand, the position of the bead under the turned end portion of the body part ensures that the closing ring stays in place especially when it is attached by heat sealing, e.g., to both the closing part and the end portion of the body part. Once fitted within the ends of the body part the closing ring cannot thus any longer be removed without breaking the package.
The bead of the closing ring is preferably inserted between the closing part and the end surface of the end portion.
In the following the package according to the invention and its operation will be described in greater detail with reference to the attached drawing, wherein
FIG. 1 is a cross-sectional view of one end of a package according to a first embodiment of the invention;
FIG. 2 is a cross-sectional view of one end of a package according to a second embodiment of the invention;
FIG. 3 is a cross-sectional view of a package according to a third embodiment of the invention at the joint between the body part and the closing part; and
FIG. 4 is a cross-sectional view of a package according to a fourth embodiment of the invention at the joint between the body part and the closing part.
FIG. 1 shows a cross-sectional view of one end of a package according to the first embodiment of the invention. The package comprises a substantially cylindrical body part 1 and a substantially round closing part 2 attached to the end of the body part. The substantially cylindrical shape is to be preferred because the pressure acting on the joint between the body part and the closing part from within the package is thereby distributed evenly over the whole length of the joint. The cylindrical shape of the body part 1 can be achieved, e.g., by bending a straight sheet into a cylinder and by fa
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Kleemola Pertti
Mykkanen Ensio
McDonald Christopher
Shoap Allan N.
Yhtyneet Paperitehtaat Oy
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