FR2679528A1 - Packaging box, method and installation, production of such a box filled and closed - Google Patents

Abstract

Packaging box of the type comprising: - a packaging body (3), shaped, rigid, with a cardboard base, having a bottom (6) and a side wall (7) defining an opening (8); - a protective film (4) fixed, by its periphery, to the body (3), about its opening (8) closing it by means of a first means of joining (12) and, - a lid (5) covering the protective film (4), joined to the body, characterised in that the lid (5) is fixed to the film (4) by a second means of joining (16) such that, on the one hand, the lid (5) and the film (4) form a monobloc assembly capable of being manipulated as such without unwanted dissociation in order to be used in a lid fitting device and that, on the other hand, the lid (5)/film (4) joining force of the second means (16) is less than the film (4)/body (3) joining force of the first means (12) such that, the box (1) being closed, the lid (5) normally remains firmly joined to the box (1) and that on removing the lid by a sufficient manual pull, acting against the second means of joining (16), the film (4) remains joined to the body (3).

Description

PACKAGING BOX,
PROCESS AND IN8TALLATION,
REALIZATION OF SUCH A FILLED AND CLOSED BOX
The invention relates to a packaging box of the type comprising
- a packaging body, shaped, rigid, cardboard-based, having a bottom and a side wall defining an opening
- a protective film fixed, by its periphery, to the body, around its opening by closing it, thanks to a first securing means; and
- a cover covering the protective film, secured to the body.

 The invention also relates to a method and an installation for producing such a filled and closed box.

 Packaging boxes of the type previously mentioned are already known. According to a first known embodiment, the film is made of aluminum. It is stamped and heat sealed on the body. According to a second known embodiment, the film, of plastic or other similar material is fixed to a ring-shaped jumper placed on and fixed to the body around its opening. These achievements do not allow obtaining single-material packaging. They also do not make it possible to obtain packaging which can be easily separated into several parts according to the constituent materials.

 The document FR-A-2 644 754 relates to a packaging box body produced from two cardboard-based blanks secured to one another, having the same conformation, offset one relative to the other in the area where the two extreme parts of the two blanks wound according to the shape of the body are secured to one another.

 The subject of the invention is a packaging box of the type mentioned above which either or may be single-material or be, after use, dissociated into several parts according to the constituent materials. Such a packaging box is particularly suitable for ecological constraints. These objectives are achieved without generating substantial disadvantages or without losing the benefit of known advantages such as the existence of a tear-off tab for the film.

 To this end, a packaging box of the type described above is characterized in that the cover is fixed to the film by a second securing means such that, on the one hand, the cover and the film form a one-piece assembly capable to be handled as such without untimely dissociation in order to be used in a cover removal device and, on the other hand, the cover / film securing force of the second means is less than the film / body securing force of the first means means, so that, the box being closed, the cover normally remains attached to the box and that by removing the cover, by sufficient manual traction against the second attachment means, the film remains attached to the body.

According to another aspect, the invention also relates to a method of producing such a box filled with contents and closed which is characterized by the succession of steps consisting in
1. Make the body separately on the one hand and on the other hand a one-piece cover / film assembly
2. Fill the body with the contents
3. Ensure the closing of the body thus filled with the cover / film assembly thus produced and the fixing of the film on the body.

 To make the one-piece cover / film assembly, one starts with lids and films previously prepared separately and a film is fixed to a cover. To this end, the second securing means is used.

 To secure the film on the body, either place a bead of glue on the edge of the opening of the body when the latter is still open or on the corresponding periphery of the film, or heat seal the film on the body.

According to another aspect, the invention also relates to an installation for implementing the method which comprises
- a body making sub-assembly
- a sub-assembly for making one-piece cover / film assemblies
- body and cover / film power supplies thus produced, separately and individually
- means for filling a body with the desired content
- A device for removing and securing a one-piece cover / film assembly on a body thus filled.

The other characteristics of the invention will result from the description which follows with reference to the following appended figures
Figure 1 is a schematic view in axial section of a box according to the invention, empty but closed.

 Figures 2A, 2B, 2C, 2D and 2E are five schematic half-views in axial section, partial, illustrating the successive stages of one. process for producing such a box according to FIG. 1 in the case of an association by bonding, namely, respectively, the constitution of the one-piece cover / film assembly (FIGS. 2A and 2B), the preparation of the body of the box, the free edge of the opening being glued (Figures 2-C and 2D) and, finally, the removal and association of the one-piece cover / film assembly of the body (Figure 2E).

 Figure 3 is a partial schematic perspective view of an installation for staging the process which is illustrated.

 Figure 4 is a schematic view in axial section illustrating the opening of a box according to the invention.

 A packaging box 1 according to the invention is intended for packaging a content 2. According to typical embodiments such a box can be intended for food products in quantities of household use.

 The box 1 comprises a body 3, a film 4 for protecting the content 2, and a cover 5.

 The body 3 is shaped, rigid, made from cardboard.

 I1 comprises a bottom 6 and a side wall 7 defining opposite the bottom 6 an opening 8. The bottom 6 can be rigidly associated with the side wall 7 by a first rolled peripheral edge 6a of the latter trapping a peripheral rim 9 of the background 6.

 The opening 8 is limited by a second edge 10 of the side wall 7 located in a plane P (generally upper horizontal, in the normal position of the box as shown in the figures).

 The film 4 is fixed by its periphery 11 and its internal face (turned towards the inside of the body 3) to the said body 3 around its opening 8, in this case the edge 10. The film 4 thus closes the opening 8. Not only does the film 4 protect the content 2 from manipulation, access, undesirable infringements before use, but it also ensures the closing of the opening 8 with a certain seal. Finally, it guarantees the inviolability of the box 1. The film 4 is fixed to the body 3 by means of a first securing means 12.

 The film 4 can be provided with one or more total or partial precut lines.

The opening can then be ensured by a depression located on the film 4.

 According to the invention, the film 4 is directly fixed to the body 3 by the means 12 but without interposing between them an additional part such as a jumper.

 The film 4 is based on plastic, aluminum, paper. It can be complex.

 The first securing means 12 is a bead of glue or heat seal closed on itself around the opening 8, on the edge 10.

 The free edge 10 of the side wall 7, opposite the bottom 6 and defining the opening 8 is wound on itself to form a bead. Its flatness in the plane P and more especially the absence of a "donkey's back" at the junction of the two extreme parts of the blank constituting the body 3 is ensured in particular by the implementation of the technique described in the document FR-A -2 644 754 already mentioned (offset of the two constituent layers of the blank).

 The cover 5 is based on plastic, cardboard. In the embodiment considered, it is of the styling type and comprises a main wall 13 located in or near the plane P, a peripheral groove 14 open towards the body 3, and a falling edge 15 directed in the same direction as the groove 14. The annular space between the groove 14 and the falling edge 15 forms a support for the film 4 against the free rolled edge 10. This falling edge 15 is intended to come against the side wall 7 near the opening 8. It is directed towards the background 6.

 The cover 5 having a certain rigidity for the protection of the film 4 is intended to cover the film 4. It is therefore located towards the external face of the film 4 affixed to the internal face. The cover 5 is secured to the body 3 as described and, optionally, by an attached adhesive strip overlapping on the edge 15 and the side wall 7 (not shown).

 According to the invention, the film 4 and the cover 5 are fixed to each other by a second securing means 16. This second securing means is therefore interposed between the external face of the film 4 and the internal face of the film. cover 5 turned towards the inside of the body 3 and therefore not visible to an outside observer when the box 1 is closed. The film 4 is located inside the cover 5, on the side of the groove 14 and the falling edge 15.

 The second securing means 16 is one or more points of glue or heat sealing. The expression "point" is understood here not in geometric sense but according to that commonly accepted in the packaging industry (localized deposition of glue by means of a sizing gun).

 The first and second securing means 12, 16 are in the embodiment considered spaced from one another. This means that they are not located directly above each other. Thus, the second means 16 is located in the central part 17 of the cover 5 and of the film 4, therefore towards the main axis of the box 12 while the first means 12 is located at its periphery as it has been described.

 The first and second pleas 12,16 relate, each of them to the entire association body under consideration. For example, with regard to the second means 16, it designates the single bonding point or the set of glue points when there are several. In the latter case, there may be several spots of glue 16 regularly distributed around the axis of the cover and more particularly close to the latter. In particular, two diametrically opposite glue dots are provided. In this case, these are more especially situated towards the short sides of the cover, the latter being of rectangular shape with rounded edges with two short sides and two long sides.

 The structure described is such that the cover 5 is fixed to the film 4 by the second securing means 16 so that, on the one hand, the cover 5 and the film 4 form a one-piece assembly able to be handled as such without untimely dissociation to be used in a cover removal device and on the other hand, the cover 5 / film 4 fastening force of the second means 16 is less than the film 4 / body 3 fastening force of the first means 12. Thus, the box 1 being closed, the cover 5 remains normally secured to the box 1 in the absence of sufficient external traction and that by removing the cover 5 by sufficient manual traction, against the second securing means 16 , the film 4 remains secured to the body 3.

 The "joining force" referred to here is the force which, generated by the joining means 12, 16 considered, ensures the rigid association of the pieces considered (body 3 and film 4, film 4 and cover 5 respectively). It is understood by the fact that a first securing force is "less" than a second securing force, the fact that the breaking limit of the securing means generating the first force is less than the breaking limit of the securing means generating the second force.

We now refer to Figures 2A to 2E which illustrate the process in one of its possible embodiments (case where the means 12, 16 are glue)
In FIG. 2A, the cover 5 and the film 4 are dissociated as they were originally, after having been prepared separately. The second securing means 16 are used. To this end, a point of adhesive 16 is deposited on the internal face of the wall 13 of the cover 5 in its central part 17 (as an alternative or cumulative variant on the external face of the film 4 in the middle zone).

 The point of glue 16 having been deposited, the film 4 is brought by its external face to contact on the internal face of the wall 13 and reciprocal pressure is ensured between the film 4 and the cover 5, the time necessary for setting glue 16. A hot-melt glue can be used.

 In Figure 2B there is shown the cover 5 and the film 4 associated to form a one-piece assembly.

 In FIG. 2C, the body 3 previously prepared as indicated, is shown to be open (without film 4 and in fact empty).

 Then, (FIG. 2D) a bead of adhesive is deposited from the first securing means 12 on the rolled edge 10 by means of a coating cylinder 18 (FIG. 3) or any other equivalent means. This operation is carried out after filling the body 3 with the content 2. As an alternative or cumulative variant, the bead of adhesive 12 is deposited on the internal face of the film in the zone intended to come into contact, after removal of the film assembly. 4 I cover 5 on the body 3, on the rolled edge 10.

 It is then possible to deposit the one-piece cover 5 / film 4 assembly on the body 3. Thanks to possible pressure means 19 (FIG. 3) of the cover 5 / film 4 assembly on the body 3, the setting is ensured. glue 12.

 In the case where the joining means or means 12, 16 are a heat seal and not an adhesive, the method described is adapted accordingly. It uses pressure and heating means ensuring heat sealing as is well known in the packaging industry.

An installation for implementing the adhesive method as described comprises
- a body making sub-assembly (not shown)
- A subassembly for making one-piece cover I film assemblies (not shown);
- power supplies 20 and 21 of body 3 and the cover 5 / film 4 assemblies thus produced, separately and individually
- Means 22 for filling a body 3 with the desired content 2;
- A device 23 for removing and securing a one-piece cover 5 / film 4 assembly on a body 3 thus filled. This device may include, or may be associated with, means 19 for reciprocal pressure in the axial direction of the one-piece cover 5 / film 4 assembly on the filled body 3.

 The installation can be integrated, all the sub-assemblies, means, devices forming a whole. Or, on the contrary, the installation as presented here is virtual because, for example, the body 5 and the assemblies 4, 5 are produced separately, the corresponding sub-assemblies therefore being dissociated from the installation.

 Embodiments of a body embodiment sub-assembly, body supplies, covers, filling means, cover removal device can be found in the prior art.

Claims (19)

 1. Packaging box of the type including  - a packaging body (3), shaped, rigid, cardboard-based, having a bottom (6) and a side wall (7) defining an opening (8>  a protective film (4) fixed, by its periphery, to the body (3), around its opening (8) by closing it, thanks to a first securing means (12) and  - a cover (5) covering the protective film (4), secured to the body,  characterized by the fact that the cover (5) is fixed to the film (4) by a second securing means (16) such that, on the one hand, the cover (5) and the film (4) form a one-piece assembly able to be handled as such without untimely dissociation to be implemented in a cover removal device and, on the other hand, the cover (5) / film (4) securing force of the second means (16) is lower to the bonding force film (4) / body (3) of the first means (12), so that, the box (1) being closed, the cover (5) normally remains attached to the box (1) and that by removing the cover by sufficient manual traction, against the second securing means (16), the film (4) remains secured to the body (3).  2. Box according to claim 1 characterized in that the second securing means (16) is one or more points of glue or heat sealing.  3. Box according to claim 1 characterized in that the first securing means (12) is a bead of glue or heat sealing closed on itself around the opening (8), on the edge (10).  4. Box according to claim 1 characterized in that the film (4) is directly fixed to the body (3) by the means (12) without interposition between them of an additional piece such as the rider.  5. Box according to claim 1 characterized in that the body (3) has a side wall (7) with a free edge opposite the bottom wound on itself define an opening defined by a rolled edge (10).  6. Box according to claim 1 characterized in that the body (3) has an opening (8) limited by an edge (10) located in a plane as well as the film (4).  7. Box according to claim 6 characterized in that the body (3) is made from two cardboard blanks secured to one another, having the same conformation, offset from one another , in the area where the two extreme parts of the two blanks wound according to the shape of the body are joined to one another.  8. Box according to claim 1 characterized in that the film (4) is based on plastic, aluminum, paper.  9. Box according to claim 1 characterized in that the cover (5) is based on plastic, cardboard.  10. Box according to claim 1 characterized in that the cover (5) is styling and comprises a main wall (13), a peripheral groove (14) and a falling edge (15).  11. Box according to claim 1 characterized in that the first and the second means (5) for securing (12, 16) are spaced from one another.  12. Box according to any one of claims 1 and 11 characterized in that the second means (16) is located in the central part (17) of the cover (5) and the film (4).  13. A method of producing a box according to any one of claims 1 to 12 filled with content and closed, characterized by the succession of steps consisting in  1. Separately produce the body (3) on the one hand and a monobloc cover (5) / film (4>;  2. Fill the body (3) with the content (2);  3. Ensure the closing of the body (3) thus filled with the cover (5) / film (4) assembly thus produced and the fixing of the film on the body.  14. A method of producing a box according to claim 13 characterized in that to produce the one-piece cover (5) / film (4) assembly, one starts with lids (5) and films (4) previously prepared and fixes a film (4) to a cover (5) and for this purpose, the second securing means (16) are used.  15. A method of producing a box according to claim 13 characterized in that to ensure the joining of the film (4) on the body (3), a bead of adhesive (12) is deposited on the edge (10) of the opening (8) of the body (3) when that is still open or the film (4) is heat sealed on the body (3).  16. Installation for implementing the method according to any one of claims 13 to 15 characterized in that it comprises  - a body making sub-assembly (3)  - a sub-assembly for making one-piece cover (5) / film (4>  - supplies 20 and 21 of body (3) and of cover (5) / film (4) assemblies thus produced, separately and individually;  - means 22 for filling a body (3) with the desired content  - A device (23) for removing and securing a one-piece cover (5) / film (4) assembly on a body 3 thus filled, including or possibly associated with means (19) for pressing the one-piece assembly cover (5) / film (4) on the filled body (3).