The invention concerns packaging for transport and conservation made from a blank sheet of material such as cardboard or corrugated cardboard. Potential applications include the transport of fresh food such as fish or meat, either alone or with the addition of ice.

This packaging consists of a bottom and relatively hermetic side walls to withstand exudates and/or melting ice and to improve retention, possibly channeling evacuation, and of a lid adapted to the base.

We know of packaging used for these applications. One representation combining various technical devices appears in patent EP 93401932.4. This patent includes devices shown in Figure 4, such as the side gussets marked out by two 90° seams (mark 110) and a 45° seam (mark 113) between the previous two, so that the external assembly devices, such as the panels (mark107) and their extensions on both sides, are combined with the panels (mark 109). The purpose of the gussets is to ensure the continuity of the side walls between them and with the base and the purpose of the external assembly devices is to prevent liquids from travelling back up the material through capillary action as internal devices would do. The afore mentioned devices have the advantage of not letting any edge of the material come into contact with the liquid inside.

On the other hand, these devices have many disadvantages.

Like the seam (mark 113) of the afore mentioned patent, the gussets have 180° seams that cause partial rupture of the protective lining film and reinforced walls whose resistance to folding negatively affects the ease of assembly and precision.

The external assembly devices have the great drawbacks of often being impossible to assemble mechanically and/or quickly and of weakening resistance to stacking packaging placed on top of each other due to excess play.

The present invention aims to overcome these drawbacks, while ensuring the relative sealing required.

• Figure 1 is a flat view of the base of the packaging subject to the invention, as supplied by the packaging manufacturer to the user possessing amounting/assembly machine, after cutting the punch and before assembling the volume and assembling the packaging on itself.
• Figure 2 is a flat view of the lid of the packaging subject to the invention, as supplied by the packaging manufacturer after cutting the punch.
• Figure 3 is a 3D view of the base of the packaging in Figure 1, after mounting/assembly and before filling by the user customer.
• Figure 4 is a 3D view of the base of the packaging in Figure 3 after filling and fastening the lid in Figure 2.

The first component (F) of the packaging subject to the invention is the base shown in Figures 1 and 3.

This first component is built around the central panel (1) forming the base itself, preferably rectangular or square, extended on all four sides by roughly rectangular side panels (2 and 3) opposite in pairs on either side of the central panel (1) in perpendicular directions. The first side panels (2) opposite to the first direction are connected to the base by hinge folds (4). The side panels (3) opposite to the direction perpendicular to the previous one are joined to the base by hinge folds (5). The second side panels (3) are themselves extended by partial shuttering panels (6) for closing the upper part of the base, connected to the second side panels (3) by hinge folds (7) and themselves extended in a perpendicular direction by supplementary assembly tabs (8) by means of folding lines and hinge folds (9). Running parallel with the previous, main assembly tabs (10) also extend the second side panels (3) by means of folding lines and hinge folds (11).

Formation and assembly is performed in the following way:

• Firstly: lay down wide lines of thick adhesive (12) parallel to the folding lines (11) between the second side panels (3) and the main assembly tabs (10). These lines of adhesive, laid over the second side panels (3), are very close to the folding lines (11) so as to be located opposite the edge of the material of the first side panels (2) when they end by bearing on the internal side of the second side panels (3). Thus, the adhesive will seal the edge of the material (13) along the entire height-depth of the packaging and ensures the connection necessary for a hermetic seal along the perimeter formed by the alternating sequence of the side panels (2 and 3). The lines of adhesive (12) are laid roughly along the extension of the hinge folds (4) connecting the central panel (1) to the first side panels (2).
• Secondly: lay thinner lines of assembly adhesive (14) on the internal side of the main assembly tabs (10) and attach by superimposing these main assembly tabs (10) onto the external side of the first side panels (2).
• Thirdly: lay shorter lines of assembly adhesive (15) on the internal side of the secondary assembly tabs (8) and attach by superimposing these secondary assembly tabs (8) onto the external side of the main assembly tabs (10).

At least one hole per panel, if not two or three, is cut out of the side panels tangentially to their folding lines and hinge folds with the central panel, the holes allowing for evacuation of exudates or the water of melted ice to the outside of the packaging, in accordance with certain legislation when storage and transport conditions permit. Packaging destined for air transport, for example, does not have evacuation holes.

The second component (C) of the packaging subject to the invention is the lid shown in Figures 2 and 4. It is adapted to the structure of the upper plane of the first component, which it completes by finishing the packaging seal.

This second component consists of a flat main panel (20) roughly in the form of a cross. Two parallel folding lines and hinge folds occur twice (22) and define the locking tabs (21).

Whereas the main panel (20) is partially superimposed on the partial shuttering panels (6) of the base, after pivoting the free ends of the locking tabs (21) according to their hinge folds (22), they slip into these same panels to prevent the lid from shifting horizontally (C) in both directions perpendicular to the side walls of the base (2 and 3). On the periphery of these panels and tabs, the straight (23) lines or right-angle lines forming the perimeter of the lid (C) are preferably bevelled or rounded to reduce the chance of packaging getting entangled during handling.

The distance between both split parallel hinge folds (21) of the lid (C) is less than the remaining free space between the partial shuttering panels (6) of the base (F) so that the locking tabs (21) may be engaged correctly in the partial shuttering panels (6) and positioned in such a way that in plans they form an obtuse angle with the central panel (20) of the lid in order to not bear on the content.

The maximum distance between the free opposite outer edges of both locking tabs (21) of the same side of the lid (C) is roughly equal to the available inner distance between the first two side panels (2) of the base (F) when they are in position after formation in order to avoid any lateral movement of the lid relative to the base in that direction.