Improved packaging apparatus for packaging at least two containers in a batch

Abstract

The present invention relates to a packaging device (1) for packaging at least two containers (2) in a batch, the containers (2) being bottles or, for example, cylindrical canisters, with a base (3), a body (4) and a shoulder (5) connecting the body (4) to a neck (6), the device comprising at least one sheet (8) of a semi-rigid or rigid material provided with at least two openings (9) for receiving the necks (6) of the containers (2), the packaging device (1) being characterized in that the sheet (8) is obtained by forming a multilayered cellulosic base structure from at least a first layer of cellulose fibers formed in a dry state and a second layer in the form of strips of cellulose fibers, the sheet (8) being made of a multilayered cellulosic base structure obtained by superimposing the at least first and second layers in contact with each other, and placing the superimposed layers in a mold, where it is pressurized and heated, to obtain a two-dimensional or three-dimensional composite fiber sheet having a monolayer configuration.

Description

[Technical Field]

[0001] The present invention relates to the field of packaging containers in batches, and more particularly to a packaging device for packaging at least two containers in a batch. [Background technology]

[0002] Prior art In the context of the present invention, a container is a bottle or a flask, the container consisting of a base, a body and a shoulder connecting the body to the neck. Such containers are intended to contain fluids, liquids, powders or granules, in particular of the agri-food or cosmetic type, although this list is not exhaustive.

[0003] For their handling, such finished containers are often packaged in batches. Each batch thus includes a plurality of containers arranged, for example, in rows and columns in a matrix arrangement generally in the form of a parallelepiped, often square or rectangular shape. By way of example, a conventional batch might include six containers together in two rows and three columns.

[0004] After the batches of containers have been produced, in order to facilitate handling of the batches thus obtained, it is necessary to carry out a process called shrink wrapping, which generally involves wrapping each batch of containers in a heat-shrinkable film.

[0005] This process of shrink wrapping involves a large energy consumption. Furthermore, the use of films made from plastic materials is harmful to the environment, with nearly half of the plastic waste found in the oceans being single-use plastic objects.

[0006] While many plastics are currently said to be "recyclable," this approach is generally inadequate and unsatisfactory because the use of shrinkable plastic films has many negative environmental impacts, including the resulting energy consumption, single-use, low levels of recycling, and the large-scale export of plastic waste to countries with recycling infrastructure. Furthermore, the composition of films that are only partially recyclable complicates the process, and the waste generated is often not reused.

[0007] Furthermore, the use of a plastic film to cover the product makes it impossible to remove one of the containers from the batch without causing its complete or partial displacement.

[0008] Thus, there is an increasing need to find alternatives to the use of this material, which generates huge amounts of waste and is expensive in terms of energy, while ensuring its robustness and making it possible to handle it.

[0009] In this regard, known alternatives to the use of shrinkable plastic film for forming batches include the use of straps or webs made of plastic material that surround the containers to hold the products together, which solution is unsatisfactory because, in addition to the fact that it requires the use of plastic material, it generally requires other additional means, such as adhesives, to seal the batches used, which leads to complete displacement of the batch of containers when the containers are removed or the straps break.

[0010] To overcome these drawbacks, packaging solutions using corrugated cardboard have already been considered, as is the case in particular in documents US 2008 / 0257763 and WO 2013 / 185898.

[0011] Document US 2008 / 0257763 describes a solution involving the use of a corrugated cardboard plate that supports the product in the region of its base. More specifically, this document describes a system for packaging bottles with necks. The system includes a plate with a base on which a number of bottles are arranged in a series of rows. The system also includes a bridge having a planar central portion and a number of arched recesses extending around the planar central portion. Each recess is sized to receive a portion of the neck of one of the bottles. Means are provided for connecting the bottles to one another, which generate an inward force on the bottles. The bridge counteracts the inward force, thus holding the bottles in a vertical position on the base.

[0012] This solution does not require the use of additional means such as adhesives, etc. Nevertheless, this configuration does not allow the batch to be lifted or transported in an easy manner, nor does it allow easy transport of subgroups of the product of the batch.

[0013] Another solution, described in document WO 2013 / 185898, to enable the batches to be lifted involves the use of rigid plates made of cardboard or plastic material, which can hold the containers in the area of ​​their body, in the area of ​​their constriction. More specifically, this document describes a support element made of corrugated cardboard, for example corrugated cardboard, or of increased rigidity, such as cardboard or plastic material, intended for containers arranged in grouped packages. The support element comprises a main support having an area for the containers and which is horizontal in the position for use, the housing (6) for the containers being manufactured in the form of a U-shaped cutout with a rounded base and U-shaped branches that act as holding legs, and a handle area. The external support can be connected to the area for the containers, the external support being manufactured in the form of a strip-like element, having a number of opposing housings corresponding to the number of housings for the containers, and being manufactured in a corresponding manner in the form of U-shaped cutouts having a rounded base and U-shaped branches which act as opposing holding legs.

[0014] Nevertheless, this solution, although allowing the batch to be lifted, is very limited since it can only be applied to certain types of containers, and furthermore, the robustness of the batch is not guaranteed, especially when packaging containers in large formats.

[0015] All these solutions are therefore unsatisfactory as they are still made from plastic material or, if gripping means are provided, do not guarantee the integrity of the batch during handling of the batch. [Prior art documents] [Patent documents]

[0016] [Patent Document 1] US Patent Application Publication No. 2008 / 0257763 [Patent Document 2] International Publication No. 2013 / 185898 Summary of the Invention [Problem to be solved by the invention]

[0017] Therefore, one of the objects of the present invention is to overcome these drawbacks by providing a packaging device for packaging at least two containers in a batch, which has a simple and inexpensive design that ensures the integrity of the batch during handling and is advantageously made from recyclable materials that do not contain plastic material. [Means for solving the problem]

[0018] For this purpose and according to the invention, a packaging device is proposed for packaging at least two containers in a batch, the containers being bottles or, for example, cylindrical canisters, with a base, a body and a shoulder connecting the body to the neck, characterized in that the device comprises at least one sheet made of a semi-rigid or rigid material provided with at least two holes for receiving the necks of the containers, the sheet being constituted by a coarse multilayer cellulose structure obtained by forming the coarse multilayer cellulose structure from at least a first layer of cellulose fibers formed in a dry state and a second layer in the form of strips of cellulose fibers, the at least first and second layers being superimposed in contact to obtain a two-dimensional or three-dimensional composite fiber sheet with a monolayer structure, the superimposed layers being placed in a mold where they are pressurized and heated.

[0019] The first layer and / or the second layer have a composition of between 70 and 100% cellulose fibers by weight.

[0020] Preferably, the first layer and / or the second layer have a composition of 100% natural cellulose fibers.

[0021] Furthermore, the first layer of cellulose fibers formed in the dry state advantageously comprises one or more additives capable of modifying the mechanical, hydrophobic and / or oil-repellent properties of the sheet.

[0022] The first layer of cellulose fibers has a material composition of 70 to 99.9% cellulose fibers, by dry weight, and 0.1 to 30% additive(s), by dry weight.

[0023] The additive(s) of the first layer of cellulose fibers is a starch compound, a rosin compound, a butane tetracarboxylic acid compound, a gelatin compound, an alkyl ketene dimer (AKD), an alkenyl succinic anhydride (ASA), a wax compound, a silicon compound, a calcium compound, a fluorocarbon, or a combination thereof.

[0024] The second layer is formed from cellulose fibers that are dry formed in the structure of strips of cellulose fibers, woven in the structure of strips of cellulose fibers, or formed by a wet process in the structure of strips of cellulose fibers.

[0025] Advantageously, the second layer comprises one or more additives capable of modifying the mechanical, hydrophobic and / or oleophobic properties of the sheet.

[0026] The second layer has a material composition of 70 to 99.9% cellulose fiber, by dry weight, and 0.1 to 30% additive(s), by dry weight.

[0027] The additive(s) of the second layer are a starch compound, a rosin compound, a butane tetracarboxylic acid compound, a gelatin compound, an alkyl ketene dimer (AKD), an alkenyl succinic anhydride (ASA), a wax compound, a silicon compound, a calcium compound, a fluorocarbon, or a combination thereof.

[0028] Preferably, the second layer has a traction resistance greater than the traction resistance of the first layer.

[0029] According to a first embodiment, the sheet is planar, has a substantially rectangular shape and is provided with at least two parallel rows of holes capable of receiving the necks of containers.

[0030] Each hole has a tongue extending in a circular fashion toward the inside of each hole.

[0031] The tongue is obtained by forming a radial opening from the inner edge of a hole having a diameter smaller than the diameter of the neck of the container.

[0032] Advantageously, the packaging device according to the invention comprises frangible opening means for each aperture.

[0033] The frangible opening means is constituted by two parallel pre-cut lines extending radially from the edge of the hole.

[0034] The pre-cut lines of the frangible opening means extend perpendicular to the longitudinal edges of the sheet.

[0035] Furthermore, the sheet is provided with two holes, called gripping holes, in its central portion between the rows of holes.

[0036] According to a second embodiment, the sheet has a substantially rectangular shape and comprises at least two parallel rows of cups, substantially truncated cones or hemispheres, or truncated pyramids, or similar shapes, the inner walls of which can rest against the shoulders of the containers, and at their extremities each provided with a hole capable of receiving the neck of the container.

[0037] The cups are connected in pairs by beams called longitudinal and transverse beams.

[0038] The beam has a cross section in the form of an inverted U-shape.

[0039] Additionally, each hole has a tongue extending inwardly of the hole in a circular fashion.

[0040] The tongue is obtained by forming a radial opening from the inner edge of a hole having a diameter smaller than the diameter of the neck of the container.

[0041] Advantageously, the packaging device according to the invention comprises, for each hole, a breakable opening means.

[0042] The frangible opening means is constituted by two parallel pre-cut lines or lines of weakness (of smaller thickness) formed in the cup and extending radially from the edge of the aperture.

[0043] According to one variant, the frangible opening means are constituted by two parallel lines of weakness of smaller thickness, which are formed in the cup and extend radially from the edge of the hole.

[0044] The pre-cut line and / or line of weakness of the frangible opening means extend perpendicular to the longitudinal edges of the sheet.

[0045] Preferably, the packaging device according to the invention comprises two rows of three cups, the cups being connected in pairs by a central transverse beam, two lateral transverse beams and a longitudinal beam.

[0046] The device further comprises two walls, called central walls, which extend on either side of the central transverse beam between the pair of transverse beams and the two pairs of longitudinal beams.

[0047] Each central wall slopes from top to bottom from the central transverse beam towards a side transverse beam, i.e. towards the transverse edge of the sheet.

[0048] Advantageously, each central wall is provided with a hole called a gripping hole.

[0049] Each gripping hole has a circular, oval, or oval shape.

[0050] Other advantages and features will be better understood from the following description of some variants, given as non-limiting examples of packaging devices for packaging containers according to the invention, with reference to the accompanying drawings, in which: [Brief explanation of the drawings]

[0051] [Figure 1] FIG. 1 is a perspective view of a first embodiment of a packaging device according to the present invention. [Figure 2] FIG. 2 is a perspective view of a second embodiment of a packaging device according to the present invention. [Figure 3] FIG. 3 is a perspective view of a sheet of the second embodiment of the packaging device according to the present invention illustrated in FIG. [Figure 4] FIG. 4 is a plan view of a sheet of the packaging device according to the present invention illustrated in FIGS. [Figure 5] FIG. 5 is a front view of a sheet of packaging equipment according to the present invention, as illustrated in FIGS. [Figure 6] FIG. 6 is a side view of a sheet of the packaging apparatus according to the present invention illustrated in FIGS. DETAILED DESCRIPTION OF THE INVENTION

[0052] In the remainder of the description of a packaging apparatus for packaging containers according to the present invention, like reference numerals refer to like elements.The various figures are not necessarily drawn to scale.

[0053] 1, an apparatus 1 according to the invention will now be described for packaging a batch of at least two containers 2, the containers 2 being bottles having a base 3, a substantially cylindrical body 4 and a shoulder 5 connecting the body 4 to a neck 6, the neck receiving a stopper 7. The packaging apparatus 1 comprises at least one sheet 8, which will be described in more detail below, made of a semi-rigid or rigid material and provided with at least two holes 9 for receiving the necks 6 of the containers 2.

[0054] In this particular embodiment, the sheet 8 is planar, has a substantially rectangular shape and is provided with at least two parallel rows of three holes 9 capable of receiving the necks of the containers 2 to obtain batches of six bottles, the batches of bottles generally comprising six bottles.

[0055] Each hole 9 is provided with a tongue 10 which receives the neck 6 of the container and extends radially inward of the hole 9. The tongue 10 is obtained by forming a radial opening 11 from the inner edge of the hole 10, the diameter of which is smaller than the diameter of the neck 6 of the container 2. After the neck 6 of the container 2 is introduced into the hole 9, the free end of the tongue 10 is received below the lower end of the stopper and extends between the neck 6 and the lower end of the stopper, thus preventing the container 2 from escaping through the hole 9. To remove the container 2, it is only necessary to apply a traction force, rotating downwards and / or outward, by gripping the container 2 by its body 4 so that the tongue 10 is inverted or torn.

[0056] Advantageously, to facilitate the removal of the containers 2 from the sheet 8, the packaging device 1 according to the invention comprises at each hole 9 a breakable opening means 12. The breakable opening means 12 are constituted by two parallel pre-cut lines 13 extending radially from the edge of the hole 9. The pre-cut lines 13 of the breakable opening means 12 extend perpendicular to the longitudinal edges of the sheet 8.

[0057] According to a variant not shown, the precut lines 13 of the frangible opening means 12 can be replaced by parallel lines of weakness, characterized by a smaller thickness of the cup 15 in the region of these lines of weakness.

[0058] Of course, the pre-cut line 13 of the frangible opening means 12 may be replaced by any other equivalent means known to those skilled in the art without thereby departing from the scope of the present invention.

[0059] Furthermore, in order to facilitate gripping of the packaging device according to the invention, the sheet 8 is provided in its central part with two holes 14, called gripping holes, between the rows of holes 9. In this way, the packaging device can be gripped by introducing two fingers, such as the thumb and index finger of the same hand, into the gripping holes.

[0060] Of course, the gripping holes may be replaced by substantially oval shaped breakable flaps without thereby departing from the scope of the present invention.

[0061] Secondly, the corners of the sheet 8 are rounded to avoid any injuries when handling the batch of bottles.

[0062] According to an essential feature of the packaging device according to the invention, the sheet 8 is constituted by a coarse multilayer cellulose structure obtained by forming the coarse multilayer cellulose structure from at least a first layer of cellulose fibers formed in a dry state and a second layer of a strip structure of cellulose fibers, and by superimposing at least the first and second layers in contact to obtain a two-dimensional or three-dimensional composite fiber sheet having a monolayer configuration, by placing the superimposed layers in a mold, where they are pressed and heated.

[0063] The material from which the sheet 8 is made has the advantage of being sufficiently rigid for packaging bottles, as well as being advantageously recyclable, improving the mechanical and chemical properties of the cellulose sheet 8. As a result of the use of a multi-layer structure of cellulose blanks, the material properties of the resulting cellulose sheet 8 can be induced and controlled in a more efficient manner than with a single layer. For example, a multi-layer structure of cellulose blanks may allow different properties to be obtained on the surface of the cellulose sheet 8 compared to the properties of the core of the cellulose product. The isostatic molding pressure enables an efficient molding process of the cellulose sheet 8 in the mold, and as a result of isostatic molding, the cellulose sheet 8 can be produced with high quality even if it has a complex shape, such as the sheet 8 for the packaging device according to the present invention.

[0064] The first layer and / or the second layer of the sheet 8 have a composition of cellulose fibers between 70 and 100% by weight. Preferably, the first layer and / or the second layer have a composition of 100% natural cellulose fibers.

[0065] Furthermore, the first layer of cellulose fibers formed in the dry state advantageously comprises one or more additives capable of modifying the mechanical, hydrophobic and / or oil-repellent properties of the sheet.

[0066] For example, the first layer of cellulose fibers has a material composition of 70 to 99.9% cellulose fibers by dry weight and 0.1 to 30% additive(s) by dry weight.

[0067] The additive(s) of the first layer of cellulose fibers is a starch compound, a rosin compound, a butane tetracarboxylic acid compound, a gelatin compound, an alkyl ketene dimer (AKD), an alkenyl succinic anhydride (ASA), a wax compound, a silicon compound, a calcium compound, a fluorocarbon, or a combination thereof.

[0068] Furthermore, the second layer is formed from cellulose fibers formed in a dry state in the structure of strips of cellulose fibers, cellulose fibers woven in the structure of strips of cellulose fibers, or cellulose fibers formed by a wet process in the structure of strips of cellulose fibers.

[0069] Advantageously, and in a similar manner to the first layer, the second layer comprises one or more additives capable of modifying the mechanical, hydrophobic and / or oleophobic properties of the sheet.

[0070] For example, the second layer has a material composition of 70 to 99.9% cellulose fibers by dry weight and 0.1 to 30% additive(s) by dry weight.

[0071] The additive(s) of the second layer are a starch compound, a rosin compound, a butane tetracarboxylic acid compound, a gelatin compound, an alkyl ketene dimer (AKD), an alkenyl succinic anhydride (ASA), a wax compound, a silicon compound, a calcium compound, a fluorocarbon, or a combination thereof.

[0072] Preferably, the second layer has a traction resistance greater than the traction resistance of the first layer.

[0073] 2 to 6, a second embodiment of the packaging device according to the invention is an apparatus 1 according to the invention for packaging at least two containers 2 in a batch, the containers 2 being bottles having a base 3, a substantially cylindrical body 4 and a shoulder 5 connecting the body 4 to a neck 6, the neck accommodating a stopper 7 and comprising at least one sheet 8 made of a semi-rigid or rigid material in the same manner as described above, the material being the same as described above, and comprising at least two holes 9 for accommodating the necks 6 of the containers 2.

[0074] In this particular embodiment, the sheet 8 has a substantially rectangular shape and comprises at least two parallel rows of cups 15, of substantially frustoconical or hemispherical, or pyramidal, or similar form, the inner walls of which can bear against the shoulders 5 of the containers 2, and the tips of which are each provided with a hole 9 capable of receiving the necks 6 of the containers 2. It should be noted that the tips of the cups 15 extend in the same plane, which is considered to be horizontal insofar as the containers 2 are packed in a batch in a generally vertical position. It will be appreciated that the fact that the shoulders 5 of the containers bear against the inner walls of the cups 15 ensures better retention of the containers 2 on the sheet 8 by preventing rotation of the necks 6 of the containers 2 within the holes 9, and ensures that the containers are held relative to each other to prevent them from separating during batch handling, transport, etc.

[0075] It will be understood that the cup 15 has a shape that matches the shape of the shoulder of the container without thereby departing from the scope of the present invention, since the container 2, in this case a bottle, may have a shoulder that has a substantially hemispherical, frustoconical or frustopyramidal shape, and in particular the body of the bottle may have a circular, oval, square, etc. cross section.

[0076] The cups 15 are connected in pairs by beams called longitudinal beams 16 and transverse beams 17. The beams 16, 17 extend in the same horizontal plane, below the horizontal plane of the holes 9, and have a cross section in the form of an inverted U or V, with the concave surface of the beam facing downwards. These beams 16, 17 reinforce the sheet 8 and thus prevent displacement of the batch.

[0077] Of course, the beams 16, 17 may be of any shape and / or solid without thereby departing from the scope of the present invention.

[0078] Each hole 9 is provided with a tongue 10 which receives the neck 6 of the container and extends radially inward of the hole 9. The tongue 10 is obtained by forming a radial opening 11 from the inner edge of the hole 10, the diameter of which is smaller than that of the neck 6 of the container 2. After the neck 6 of the container 2 has been introduced into the hole 9, the free end of the tongue 10 is received below the lower end of the stopper and extends between the neck 6 and the lower end of the stopper, thus preventing the container 2 from escaping through the hole 9. To remove the container 2, it is only necessary to apply a downward traction force by gripping the container 2 by its body 4 so that the tongue 10 is inverted or torn.

[0079] Advantageously, to facilitate the removal of the containers 2 from the sheet 8, the packaging device 1 according to the invention comprises at each hole 9 a breakable opening means 12. The breakable opening means 12 are constituted by two parallel pre-cut lines 13 extending radially from the edge of the hole 9. The pre-cut lines 13 of the breakable opening means 12 extend perpendicular to the longitudinal edges of the sheet 8.

[0080] In a similar manner to the above, according to a variant not shown in the figures, the pre-cut lines 13 of the breakable opening means 12 can be replaced by parallel lines of weakness, characterized by a thinner thickness of the cup 15 in the area of ​​these lines of weakness.

[0081] Of course, the pre-cut line 13 of the frangible opening means 12 may be replaced by any other equivalent means known to those skilled in the art without thereby departing from the scope of the present invention.

[0082] Furthermore, in a specific exemplary embodiment, the packaging device 1 according to the present invention comprises two rows of three cups 15, the cups 15 being connected in pairs by a central transverse beam 17a, two side transverse beams 17b, and a longitudinal beam 16. The device also comprises two so-called central walls 18 extending between the pair of transverse beams 17 and the two pairs of longitudinal beams 16 on either side of the central transverse beam 17a. Each central wall 18 is preferably planar and slopes downward from the central transverse beam 17a toward the side transverse beams 17B, i.e., toward the transverse edges of the sheet 8. Each central wall 18 forms an angle of 5 to 30° with the horizontal plane containing the holes 9. It should be noted that the central walls 18 can advantageously receive labels, not shown in the figures.

[0083] Furthermore, to facilitate gripping of the packaging device according to the invention, the sheet 8 is provided in its central part with two breakable flaps 19 between the rows of holes 9, which can form gripping holes. In this way, the packaging device can be gripped by lowering the breakable flaps 29 and then inserting two fingers, such as the thumb and index finger of the same hand, into the gripping holes. The breakable flaps 19 have a substantially oval shape. However, the breakable flaps 19 can have any shape, such as rectangular, circular, or oval, without thereby departing from the scope of the invention.

[0084] Of course, the breakable flap 19 may be replaced by a gripping hole without thereby departing from the scope of the invention.

[0085] Finally, it is clear that the given examples are only specific illustrations that are in no way limiting as to the application area of ​​the invention.

Claims

1. 1. A packaging device (1) for packaging at least two containers (2) in a batch, the containers (2) being bottles or, for example, cylindrical canisters, with a base (3), a body (4), and a shoulder (5) connecting the body (4) to a neck (6), the device comprising at least one sheet (8) made of a semi-rigid or rigid material, the sheet (8) being provided with at least two holes (9) for receiving the necks (6) of the containers (2), the sheet (8) being constituted by a coarse multilayer cellulose structure obtained by forming the coarse multilayer cellulose structure from at least a first layer of cellulose fibers formed in a dry state and a second layer of a structure of cellulose fiber strips, the at least first and second layers being superimposed in contact with each other to obtain a two-dimensional or three-dimensional composite fiber sheet having a monolayer structure, the superimposed layers being placed in a mold, where they are pressurized and heated.

2. Packaging device (1) according to claim 1, characterized in that the first layer and / or the second layer have a composition of cellulose fibres between 70 and 100% by weight.

3. 3. Packaging device (1) according to claim 1 or 2, characterized in that the first layer and / or the second layer has a composition of 100% natural cellulose fibres.

4. 4. Packaging device (1) according to any one of claims 1 to 3, characterized in that the first layer of cellulose fibers formed in the dry state comprises one or more additives capable of modifying the mechanical, hydrophobic and / or oil-repellent properties of the sheet.

5. 5. The packaging device (1) according to claim 4, characterized in that the first layer of cellulose fibers has a material composition of 70 to 99.9% by dry weight of cellulose fibers and 0.1 to 30% by dry weight of additive(s).

6. 6. The packaging device (1) of claim 5, wherein the additive(s) of the first layer of cellulose fibers is a starch compound, a rosin compound, a butane tetracarboxylic acid compound, a gelatin compound, an alkyl ketene dimer (AKD), an alkenyl succinic anhydride (ASA), a wax compound, a silicon compound, a calcium compound, a fluorocarbon, or a combination thereof.

7. 7. The packaging device (1) according to any one of claims 1 to 6, characterized in that the second layer is formed from cellulose fibres formed in a dry state in the structure of strips of cellulose fibres, woven in the structure of strips of cellulose fibres, or formed by a wet process in the structure of strips of cellulose fibres.

8. 8. Packaging device (1) according to claim 7, characterized in that the second layer comprises one or more additives capable of modifying the mechanical, hydrophobic and / or oleophobic properties of the sheet.

9. 9. The packaging device (1) according to claim 8, characterized in that the second layer has a material composition of 70-99.9% by dry weight of cellulose fibers and 0.1-30% by dry weight of additive(s).

10. 10. The packaging device (1) according to claim 8 or 9, characterized in that the additive(s) of the second layer are starch compounds, rosin compounds, butane tetracarboxylic acid compounds, gelatin compounds, alkyl ketene dimers (AKD), alkenyl succinic anhydrides (ASA), wax compounds, silicon compounds, calcium compounds, fluorocarbons, or combinations thereof.

11. 11. Packaging device (1) according to any one of claims 1 to 10, characterized in that the second layer has a traction resistance greater than the traction resistance of the first layer.

12. 12. Packaging device (1) according to any one of claims 1 to 11, characterized in that the sheet (8) is planar, has a substantially rectangular shape and comprises at least two parallel rows of holes (9) capable of receiving the necks (6) of the containers (2).

13. Packaging device (1) according to any one of claims 1 to 12, characterized in that each hole (9) is provided with a tongue (10) extending in a circular manner towards the inside of each hole (9).

14. 14. Packaging device according to claim 13, characterized in that the tongue (10) is obtained by forming a radial opening (11) from the inner edge of a hole (9) having a diameter smaller than the diameter of the neck (6) of the container (2).

15. Packaging device according to any one of claims 12 to 14, characterized in that it comprises breakable opening means (12) for each hole (9).

16. 16. Packaging device according to claim 15, characterized in that the frangible opening means (12) consist of two parallel pre-cut lines (13) extending radially from the edge of the hole (9).

17. 16. A packaging device according to claim 15, characterized in that the frangible opening means (12) consist of two parallel lines of weakness having a smaller thickness and extending radially from the edge of the hole (9).

18. 18. Packaging device according to claim 16 or 17, characterized in that the pre-cut lines (13) and / or lines of weakness of the frangible opening means (12) extend perpendicular to the longitudinal edges of the sheet (8).

19. 19. Packaging device according to any one of claims 12 to 18, characterized in that the sheet (8) comprises, in its central part, two so-called gripping holes (14) between the rows of holes (9).

20. 12. Packaging device according to any one of claims 1 to 11, characterized in that the sheet (8) has a substantially rectangular shape and comprises at least two parallel rows of cups (15) of substantially truncated cone or hemisphere, or of truncated pyramid or similar form, the inner walls of which can rest on the shoulders (5) of the containers (2) and at their extremities each have a hole (9) capable of receiving the neck (6) of the container (2).

21. 21. Packaging device according to claim 20, characterized in that the cups (15) are connected in pairs by beams (16, 17), called longitudinal beams (16) and transverse beams (17).

22. 22. Packaging device according to claim 21, characterized in that the beams (16, 17) have a cross section generally in the shape of an inverted U or an inverted V.

23. Packaging device according to any one of claims 20 to 22, characterized in that each hole (9) is provided with a tongue (10) extending in a circular manner towards the inside of each hole (9).

24. 23. Packaging device according to claim 22, characterized in that the tongue (10) is obtained by forming a radial opening (11) from the inner edge of a hole (9) having a diameter smaller than the diameter (6) of the neck (6) of the container (2).

25. Device for packaging according to any one of claims 20 to 24, characterized in that it comprises a breakable opening means (12) for each hole (9).

26. 26. Packaging device according to claim 25, characterized in that the breakable opening means (12) are constituted by two parallel pre-cut lines (13) formed in the cup (15) and extending radially from the edge of the hole (9).

27. 27. Device for packaging according to claim 26, characterized in that the pre-cut lines (13) of the frangible opening means (12) extend perpendicular to the longitudinal edges of the sheet (8).

28. 28. Packaging device according to any one of claims 20 to 27, characterized in that it comprises two rows of three cups (15), the cups (15) being connected in pairs by a central transverse beam (17a), two lateral transverse beams (17b) and a longitudinal beam (16).

29. 29. Packaging device according to any one of claims 21 to 28, characterized in that it comprises two walls, called central walls (18), extending on either side of the central transverse beam (17a) between the pairs of transverse beams (17) and the two pairs of longitudinal beams (16).

30. 30. Packaging device according to claim 29, characterized in that each central wall (18) slopes from top to bottom from the central transverse beam (17a) towards a side transverse beam (17b), i.e. towards the transverse edge of the sheet (8).

31. 31. Packaging device according to claim 29 or 30, characterized in that each central wall (18) is provided with a gripping hole (14).

32. 32. Packaging device according to claim 31, characterized in that each gripping hole (13) has a circular, oval or oval shape.

Images