Envelopes – wrappers – and paperboard boxes – Paperboard box – Multi-layer side or bottom wall having two or more layers of...
Patent
1997-11-25
1999-11-23
Garbe, Stephen P.
Envelopes, wrappers, and paperboard boxes
Paperboard box
Multi-layer side or bottom wall having two or more layers of...
229 8703, B65D 6522
Patent
active
059884924
DESCRIPTION:
BRIEF SUMMARY
The invention is an improvement of Patents FR-A-2,595,666 and FR-A-2,673,909 which consists of a new way in which to pleat a flexible sheet with semi-rigid regions in order to make it into a package capable of supporting loads, for convex bodies and, in particular, for packaging sandwiches made from round loaves.
Patent FR-A-2,595,666 describes a package for convex bodies produced from a flexible sheet which has been pleated to form flat pleats. One of the applications of this patent is in the packaging of sandwiches produced from round loaves. Use of this package requires the use of very thin papers because the sandwiches, which are very fragile in consistency when they are made, risk being damaged when packaged. Owing to the consistency of the sandwiches, some fast-food chains require sandwich packages to have sufficient lift ability to support, for example, two other sandwiches, without collapsing. The solution currently used is a thermo-formed polystyrene-foam box, which poses serious environmental problems, and a compact cardboard box, which is very expensive. A major fast-food chain uses a micro-fluted cardboard box, which is lighter but which is three times as heavy as a paper package. It is has been proposed in Patent FR-A-2,676,037 to place in the median part of the sheet used for pleating, according to Patent FR-A-2,595,666, to secure on the sheet before it is pleated, a strip perpendicular to the pleats so as to provide new performance levels in a specific region. One application of this principle is to secure, in the median part of the sheet before pleating, a strip for increasing the rigidity of this region and to form what will hereinafter be referred to as a reinforced central region. When the package according to Patent FR-A-2,595,666 is expanded, this reinforced central region forms a vertically placed belt which provides vertical lift ability. The more rigid the belt thus formed, the more difficult it is for the package to expand around the sandwich and the fragility of the sandwich is such that it risks being damaged. It is therefore necessary to attempt to lighten this reinforcement region as much as possible and, to compensate for this lightening, to give it a shape which makes it possible to increase the vertical strength, i.e. parallel to the direction of the pleats, whilst reducing it in the direction of expansion of the pleats. To increase the vertical strength, one solution consists in giving an appropriate shape to the strength region when it is expanded. One solution consists in using a reinforcement strip with flutings; the problem is that, when the flat pleats are made, as described in Patent FR-A-2,595,666, the flutings are squashed and then lose the essence of their characteristics. A further solution consists in giving the reinforced central region, when it is expanded, a corrugated form or a zigzag form. Expansion of the pleats from flat pleats does not make it possible to ensure satisfactory distribution of the zigzags right around the sandwich; in particular, it is possible for them to disappear in certain regions. One way in which to solve this problem is to produce concertina pleats instead of flat pleats, as described in Patent FR-A-2,673,909; concertina pleats are easier to expand, but the problem is still one of the satisfactory distribution of the zigzag pleats around the convex body and, moreover, that of fixing the pleats at their ends, which is difficult to carry out on a high-speed machine because it requires at least one change in direction.
The object of the invention is to propose a pleating method which makes it possible to solve the problems of pleating and unpleating packages in the reinforced central region.
In the drawings:
FIG. 1 shows the package according to the invention, pleated with various cut-outs to show the difference in pleating between the regions;
FIG. 2 shows the same package when it is expanded around a convex body;
FIG. 3 shows the flexible sheet which has a reinforcement formed by a fluted sheet;
FIG. 4 shows a package according to the
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Buchberg Akiva
Capy Gilbert
Garbe Stephen P.
Mai Tri M.
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