FR2837742A1 - BLANK FOR THE REALIZATION OF A PACKAGING IN A SEMI-RIGID MATERIAL, EQUIPPED ON ONE SIDE WITH A HEAT-SHRINK FILM - Google Patents

Abstract

The blank, made from a semi-rigid material such as cardboard or corrugated cardboard, is cut out to form a series of panels (1, 2, 3) and end flaps (4, 5, 6), and has an layer of thermo-shrink plastic film (7) stuck to the inner surfaces of some panels and flaps. The film is attached by adhesive strips (8, 12) to some panels, and by spots of adhesive (10) to other panels and end flaps. After the package has been assembled the plastic film is folded over the contents, detaching it from the spots of adhesive, and is then shrunk by the application of heat to enclose the contents and hold them firmly to the panels with adhesive strips.

Description

to that of the front face (18).

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  Blank for the realization of a packaging in a semi-rigid material, equipped on one side with a film in a heat-shrinkable material. The present invention relates to a blank in a semi-rigid material such as cardboard or corrugated cardboard, precut and repressed, equipped on one side with a film in a heat-shrinkable material, for the realization

new packaging.

  The invention also relates to the packaging carried out at

from this blank.

  It has long been proposed to provide inside cardboard or corrugated packaging one or two sheets of a thermoplastic material, fixed on the internal faces of certain parts of the packaging and clips, after being put in place. inside of it various articles or products of varicose dimensions, to cover these articles or products and to enclose them tightly after retraction (see for example French patents N 2 703 656, 2 625 681, 2 625 173 and 2 506 722, all of which belong to the Applicant). Such packages are very popular with users because of their simplicity, ease of use and high reliability, and many variations are available in the art. The present invention is concerned with packaging of this type originating from a precut and repressed blank, which is equipped with a single film of heat-shrinkable material extending over panels intended to constitute walls or parts of packaging walls, as well that on flaps or flaps articulated by upsets on these flaps and intended to overlap at least partially when the packaging is placed in volume. The invention is also interested in such packages comprising bellows in two parts in mutual contact, which, in the starting blank are covered by the film

of thermosetting material.

  The invention aims more particularly to propose a blank of semi-rigid material for the production of such packaging, which lends itself to easy separation from the heat-shrinkable film and from some of the parts of the blank of which it is integral, prior to its retraction.

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  To this end, the invention has for object and a blank precut and pushed back in a semi-rigid material, such as cardboard or corrugated cardboard, for the realization of a packaging, this blank comprising: - a series of five panels rectangular of the same length, hinged together along their longitudinal edges by first parallel upsets, namely a first central panel, two second panels of the same dimensions articulated on this first panel and intended to be erected perpendicularly in the manner thereof and two third panels of width substantially equal to half that of the first panel, articulated on the second panels and intended to be erected perpendicularly to these to be brought into position parallel to the first panel; - At the ends of the first, second and third panels, flaps articulated on them by second upsets perpendicular to the first upsets, these shutters being intended to be erected perpendicular to the adjoining panels to form flaps which at least partially cover the adjoining flaps; - a film of plastic material the rmo re trac table co llé between at least some of said panels and said flaps, this film being intended to come to cover articles resting on the first panel before being subjected to a phase of shrinkage, prior to the packaging of the volume; this packaging being characterized in that the heat-shrinkable film is rigidly secured by bonding the assembly of the first panel and a part of the flaps adjoining it, this part having the shape of an isosceles trapezoid or a triangle isosceles, the largest base of which is constituted by the second delivery by which these flaps are articulated on the first panel, the heat-shrinkable film being glued in a detachable manner by dots of glue on the third panels and on the flaps adjoining these third panels and possibly the second panels, in the vicinity of

free edges of these.

  Before shaping the packaging from this blank, the articles to be packaged are placed on the face of the first panel coated with the film of heat-shrinkable material, the film is detached from the other panels and from the shutters of which it is integral, the flap on the items resting on the first panel and we proceed to the retraction

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  film by heating so that it encloses the conditioned articles

  to make them integral with the first panel.

  The other panels and the adjoining shutters are then straightened out and the parts of the film glued to the flaps deposited at the ends of the central panel lend themselves to easy folding of this film between the parts.

  overlapping with adjoining shutters.

  After setting up the packaging, it can be formed by any means known in the art, for example using an adhesive tape joining the contiguous edges of the third panels and

by gluing the flaps.

  In a variant of the blank in accordance with the invention, each third panel can be devoid of flaps at its ends and be connected to the flaps associated with the second adjoining panel by a bellows in two parts, one part being articulated on the third panel by a discharge arranged in the extension of the corresponding second upsets, while the other part is articulated on the flap adjoining the second panel by a delivery arranged in the extension of the corresponding first delivery, the two parts of the bellows being hinged together by a delivery making a angle of 45 with the previous ones, these two parts being intended to come in

  mutual contact in the volume packaging.

  In this embodiment, which also falls within the scope of the present invention, the heat-shrinkable film is detachably glued against

  the two parts of the bellows in the vicinity of the free edges thereof.

  Advantageously, in these two embodiments, precut lines can be provided in the heat-shrinkable film between the corresponding parts of the panels and the flaps or bellows of which it is not integral or on which it is detachably fixed,

  in order to facilitate the retraction of the film on the articles to be packaged.

  Whatever the embodiment considered, the packaging produced from the blanks defined above and containing articles held in position on the first panel using the

  Another object of the invention is heat-shrink film.

  Other characteristics and advantages of the blank of the invention

  will emerge from the detailed description which follows of two forms of

  realization of this blank. In this description, we will refer to

annexed drawings, in which:

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  FIG. 1 is a plan view of a first blank of corrugated cardboard which is pre-cut and pressed according to the invention; Figure 2 is a plan view of a second corrugated blank

  precut and repressed according to the invention.

  We will first refer to Figure 1. The blank shown comprises a series of five rectangular panels of the same length, hinged together by first parallel upsets, arranged along their longitudinal sides, namely a central panel 1, two panels 2 of the same width, articulated laterally on the panel 1, and two panels 3, having a width equal to half that of the panel 1, each articulated on one of the panels 2, the panels 1, 2, 3, being intended to be straightened perpendicular to the adjoining panels when placing

by volume of the packaging.

  At the ends of these panels are articulated by second upsets perpendicular to the preceding shutters referenced respectively 4, for the panel 1, 5 for the panels 2 and 6 for the panel 3. The shutters 4 to 6 are intended to be straightened perpendicular to the panels associated, when the packaging is placed in volume, by forming flaps which cover

partially the adjoining flaps.

  A film 7 of a thermosetting material extends over the panels 1-3, which it completely covers, and over the flaps 4-6, which it covers at least partially. This film is intended, in a manner known per se, to be folded over articles of varicose forms resting on the water pan 1 and to be subsequently the rmo re towed pre alab leme nt mid-volume packaging and its closure, so as to firmly enclose the conditioned articles and make them integral with the

panel 1.

  In accordance with the invention, the heat-shrinkable film 7 is rigidly secured to the assembly of the panel 1, here using three parallel strips 8 of glue, but any other method of bonding could also be used. It is also rigidly secured to a part 9 of the flaps 4, here in the form of an isosceles trapezoid, the large base of which merges with the transverse side of the adjoining panel 1, along at least part of the length of the associated delivery, but this part 9

  might as well have the shape of an isosceles triangle.

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  Furthermore, the film 7 is detachably fixed, using adhesive dots 10 on the panels 3, in the vicinity of their free edges as well as on the flaps 5 and 6, also in the vicinity of their free edges. The pre-equipped blank coated with heat-shrinkable film can thus be

  easily transported, handled and stored flat.

  When in use, the articles to be packaged are placed on the face of the panel 1 coated with film 7, which is then detached from the panels 3 and from the flaps 5 and 6, in order to be folded over these objects and to be heat-shrunk , packaging can then

to be shaped.

  During this shaping, the folding of the film 7 between the parts of the walls 4 and 5 coming to overlap is facilitated by the isosceles trapezoidal shape of the part 9, the angles of which at the base are preferably equal.

at 45.

  To facilitate the folding of the film 7 and its retraction on the articles to be packaged, pre-cut lines can advantageously be formed on the film at the level of the upsets by which the flaps 5 and 6 are respectively articulated on the panels 2 and 3, these lines of

  precut being broken during takeoff of the film.

  As indicated above, after the packaging has been shaped, it can be closed by any means known in the art. It will be noted that an opening 11 is formed in one of the panels 3 and that the film 7 is glued locally on this panel by two lines of glue 12 extending laterally, on either side of the opening, up to 'at the adjoining panel 1. The part of the film separating the lines of glue 12 and the part facing the panel 3 thus define a pocket, in which can be housed an identification sheet of the packaged articles, which can be read from the outside by the opening 11 In the variant of FIG. 2, the parts already described with reference to FIG. 1 are designated by the same reference numbers assigned to the index ', the panels 3' no longer have flaps at their ends, but are joined to the shutters adjoining the 2 'panels adjoining by two-part bellows 13' and 14 '. The parts 13 ′ are articulated on the panel 3 ′ by a discharge arranged

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  in the extension of the second upsets, while the parts 14 'are articulated on the adjoining flaps 5' by a upsetting arranged in

  the extension of the first corresponding upsets.

  The film 7 'is detachably glued with dots of glue on the parts 13' and 14 'and, after detachment of this film, these parts can come into mutual contact when the packaging is placed in volume. Here again, precut lines can be made in the film 7 ′ at the level of the upsets between the flaps 5 ′ and the parts 12 ′ on the one hand, and the panels 2 ′ and 3 ′ on the other hand, to facilitate the

  shrinkage of the film, without leaving openings in it.

  The mode of use of the blank of Figure 2 is at any point

  similar to that of the blank in Figure 1.

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Claims (5)

  1. blank precut and pushed back in a semi-rigid material, such as cardboard or corrugated cardboard, for the realization of a packaging, this blank comprising: - a series of five rectangular panels of the same length, hinged together according to their longitudinal edges by first parallel upsets, namely a first central panel (1), two second panels (2) of the same dimensions articulated on this first panel and intended to be erected perpendicularly thereto and two third panels (3) of width substantially equal to half that of the first panel (1), articulated on the second panels (2) and intended to be erected perpendicularly to these to be brought into position parallel to the first panel (1); - At the ends of the first, second and third panels (1 3), flaps (4, 5, 6) articulated on them by second upsets perpendicular to the first upsets, these shutters (4, 5, 6) being intended to be erected perpendicular to the adjoining panels (1, 2, 3) to form flaps which at least partially cover the adjoining flaps; - a film (7) of heat-shrinkable plastic glued against at least some of said panels (1-3) and said flaps (4-6), this film (7) being intended to cover articles resting on the first panel (1 ) before being subjected to a shrinking phase, prior to the packaging of the volume; this packaging being characterized in that the heat-shrinkable film (7) is rigidly secured by bonding the assembly of the first panel (1) and a part (9) of the flaps (7) adjoining the latter, this part ( 9) having the shape of an isosceles trapezoid or an isosceles triangle, the largest base of which is constituted by the second displacement by which these flaps (7) are articulated on the first panel (1), the heat-shrinkable film (7) being also glued detachably by dots of adhesive (10) on the third panels (8) and on the flaps (5, 6) adjoining these third panels (3) and possibly to the second panels (2), in the vicinity free edges of these.   2. variant of the blank according to claim 1, characterized in that each third panel (3 ') is devoid of flaps at its ends 8 2837742   but is connected to the flaps (5 ') associated with the second panel (2') contiguous by a bellows in two parts (12 ', 13'), a part (12 ') being articulated on the third panel (3') by a delivery arranged in the extension of the second corresponding delivery, while the other part (12 ') is articulated on the flap (5') adjoining the second panel (2 ') by a delivery disposed in the extension of the first corresponding delivery, the two parts (13 ', 14') of the bellows being hinged together by a discharge making an angle of 45 with the previous ones, these two parts (13 ', 14') being intended to come into mutual contact in the packaging set in volume.   3. Blank according to one of claims 1 and 2, characterized in that   pre-cut lines are provided between the corresponding parts of the panels (1-3, 1'-3 ') and the flaps (4, 5, 5') and / or bellows (13 ', 14') of which not united or on which it is stuck detachably.   4. Blank according to one of claims 1 to 3, characterized in   that a cutout (11, 11 ') is provided in at least one of the panels (3, 3'), while adhesive threads (12, 12 ') arranged laterally on either side of this cutout (1 1, 1 1 ') and extending to the adjoining panel (1, 1') join the panel (3, 3 ') and the thermoplastic film thus forming opposite the opening (11, 11' ) a pocket into which a document visible from the outside can be inserted.   5. Packaging from a blank according to one of claims 1   to 5 and containing articles held in position on the first