Envelopes – wrappers – and paperboard boxes – Wrapper – Expansible
Patent
1993-09-15
1996-05-21
Pascua, Jes F.
Envelopes, wrappers, and paperboard boxes
Wrapper
Expansible
229 8708, 383120, B65D 6512
Patent
active
055181678
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method for wrapping a convex body, or the equivalent convex volume circumscribing any body, produced from a thin film.
2. Description of the Prior Art
Since the creation of the simple or composite rectangular paper sheet, which is used to wrap cheeses, hamburgers and bread rolls, a wrapping of pleated film has been created, the folds having an asymmetrical form and being fastened on the edges, making it possible to wrap convex bodies; this relates to Patents FR-A-2595666, FR-A-2628719 and FR-A-2668457, which describe various kinds of wrappings using pleats; in these patents, the folds are defined in the form of successive strips forming rectangles, parallelograms or elongate trapezia; having a width A and B, A being different from B.
SUMMARY OF THE INVENTION
The present invention relates to the production of pleatedwrappings produced from a strip of rectangular film in which the folds are formed of a succession of equal rectangular strips; this corresponds in the above-mentioned patents to the case A=B and in which the radius of the upper and lower circles is zero.
The wrapping, forming the subject of the invention, is produced in a preferred version from a sheet of rectangular shape having a length L and a width K.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a folding formed of symmetrical folds.
FIG. 2 shows the previous folding, the ends of which have been fastened.
FIG. 3 shows a folding of the type of FIG. 1 produced on a sheet of which one side has been folded over longitudinally in order to form a double film thickness.
FIG. 4 shows the folding of FIG. 3, one corner of which has been pushed in, in the zone where there are two film thicknesses.
FIG. 5 shows the folding of FIG. 3 opened out in order to obtain a change in direction of the folds according to the invention.
FIG. 6 shows a wrapping according to the invention comprising two changes in direction.
FIG. 7 shows a wrapping according to the invention opened out around an object.
FIG. 8 shows a mechanism of fastening the folds with tape.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
When the symmetrical folds formed of identical rectangular strips 1 (FIG. 1), of width 2 and of length 3, are folded, the N folds are exactly superimposed (N being the number of folds), each fold being formed of two successive rectangular strips 1 connected together by a folding arris 4, two successive folds being also connected together by a folding arris 5; once pleated, the wrapping is in the form of a parallelepiped (FIG. 2) of length 3, width 2, and thickness 6 corresponding to the number of N folds; the thickness 6 of the folds to be fastened at their ends 7 and 8 is directly proportional to the number N of folds; the fastening techniques must be adapted according to the uses which are to be made thereof and to the number N of folds.
The folds are fastened at the ends in various ways; firstly, there are the methods for fastening sheets together, originating from book binding, such as stapling, pinching, stitching, gluing on the edge, the use of a ring passing through a hole produced with a punch, this list being non-limiting; then there are the methods of heat welding, ultrasonic sealing, electronic sewing, welding of films which are weldable or are made weldable by depositing a layer of plastic or of heat-activatable glue on one face or on both faces, this list being non-limiting. The fastening can apply to the whole width 2 of the ends 6 and 7 of the folds and both sides of the film. But it can also apply to the whole width 2 of the ends 6 and 7 of the folds, but only one side of the film; under these conditions, the faces of each fold are fastened in pairs and each fold over half of width 2 starting from the arris 4 leaving the area located on the side of the arris 5 free; the area for fastening the folds can then be partially opened out making it possible to avoid having the end of the folds bunched up together. When the end is opened out, each fold-fastening area is th
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Buchberg Akiva
Capy Gilbert
Pascua Jes F.
Wrapco International N.V.
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