FR3077807A1 - SEALED SOFT PACKAGING FOR BARBECUE COOKING FOOD PRODUCT - Google Patents

Abstract

The invention relates to a flexible sealable packaging for food products, intended to be subjected to heating for cooking. According to the invention, the package comprises a metal sheet (7) joined to a composite sheet at the three watertight sides (8) by heat sealing beads made by the heat-sealable plastic layer resistant to the high temperature of the sheet. composite and rendered inactive after a barbecue cooking, the fourth side (8) of the packaging is adapted to be provided with a system (5) for sealing the packaging made inactive after a barbecue cooking .

Description

The present invention relates to the technical field of packaging of food products in the general sense and it relates more specifically to the technical field of repackaging food products at their point of sale and / or of packaging in particular of food product sold at retail, wholesale or half -gros and intended to undergo a cooking before their consumption.

The object of the invention relates more particularly to a packaging for packaging food products intended for cooking on the grill or on the barbecue, that is to say subject to a high temperature heat source above 250 ° C., generated by all types of appliances such as, for example, combustion barbecues using wood or charcoal, gas barbecues or electric barbecues.

The state of the art has already proposed packaging designed for the packaging of food products while allowing cooking or reheating of the food products conditioned by such packaging. For example, the patent EP 1 912 877 has proposed flexible packaging in the form of a cut sheath to present two composite sheets placed in superimposed position. Each composite sheet comprises between a layer of external aluminum and a layer of heat-sealable plastic material resistant to high temperature, a layer of heat-sealable binder resistant to high temperature. These two composite sheets are assembled together at the level of three of their edges so as to leave at the level of their fourth edge an access opening allowing the food product to be placed. After the packaging has been closed, it is heated to allow the food product to be cooked or brought to temperature. This packaging is satisfactory in practice since it ensures the packaging and cooking of food products. However, such packaging is not suitable for allowing barbecue cooking of food products. In addition, access to food products requires opening the packaging.

Patent application WO 2006/067363 describes a packaging for conditioning food products so as to be able to be subjected to heating and in particular to broiling. The packaging described by this patent application comprises a sachet having an opening closed by a film forming a window, attached to the sachet by a sealing joint sensitive to pressure or to temperature to allow the film to detach automatically from the 'packaging. In practice, such packaging does not provide easy access to food products after cooking. In addition, the manufacture of this packaging is relatively complex and expensive.

The object of the invention therefore aims to remedy the drawbacks of the prior art by proposing a flexible packaging of simple and inexpensive design, capable of ensuring the packaging of food products and the barbecue cooking of food products conditioned by such a packaging while allowing easy access to food products after cooking.

To achieve such an objective, the present invention relates to a flexible packaging of a watertight nature for food products, intended to be subjected to a source for cooking, the packaging comprises a first composite sheet comprising at least between an outer aluminum layer and a layer of heat-sealable plastic material resistant to high temperature, layer of heat-sealable binder resistant to high temperature, the first composite sheet being superimposed on a second sheet by being joined together at three watertight sides and leaving an opening open access to the level of a fourth side.

According to the invention, the second sheet is a metallic sheet assembled to the first sheet at the three sealed sides by heat-sealing cords produced by the layer of heat-sealable plastic material resistant to high temperature and rendered inactive after cooking. barbecue and the fourth side of the package is able to be provided with a sealed closure system for the package rendered inactive after barbecue cooking.

In addition, the packaging according to the invention may also comprise, in combination, at least one and / or the other of the following additional characteristics:

- The fourth side of the first composite sheet is provided as a sealed closure system with an adhesive tape for repacking closure comprising a baking adhesive layer protected by a detachable protective tab;

the first composite sheet is heat sealable at a temperature between 100 ° C and 200 ° C and advantageously between 160 ° C and 190 ° C;

- The first composite sheet is capable of withstanding a temperature at least equal to 120 ° C and advantageously 140 ° C for a period of at least 25 min;

- The second sheet is an aluminum sheet advantageously embossed;

- The packaging also includes a layer of high temperature resistant paper interposed between the layer of heat-sealable plastic and the layer of heat-sealable binder;

the layer of heat-sealable binder resistant to high temperature is produced by an extrusion of polymers resistant to high temperature or by a co-extrusion of polymers resistant to high temperature;

the layer of heat-sealable plastic material resistant to the high temperature is made of polypropylene and advantageously of polyethylene teraphthalate and has a thickness of between 8 and 40 microns;

- The heat-sealable plastic layer comprises on the side of the binder layer, a non-heat sealable face and on the side of the food product contact face of the sheet, a heat sealable face;

- The aluminum sheet has a thickness between 10 and 100 microns and advantageously between 15 and 60 microns;

the first composite sheet has lines for folding the edges of the packaging in the direction of said sheet, these lines for folding extending in correspondence with the sides of the packaging and beyond the heat-sealing cords and the closure strip.

Another object of the invention is to provide a process for packaging food products, using flexible packaging intended to be subjected to a source for cooking food products.

According to the invention, the method comprises the following steps:

- provide flexible packaging in accordance with the invention;

- introduction of food products inside the packaging;

- close the packaging on its fourth side with an assembly cord;

- folding of the edges of the packaging in the direction of the first sheet;

- Positioning of the packaging so that the second sheet is facing the source for cooking;

- maintain the packaging in relation to the cooking source in order to obtain the cooking of the food products and the rupture of the heat-sealing cords and the assembly cord;

- And removal of the first composite sheet detached from the second sheet following cooking, in order to access the food products.

The method consists in providing the fourth side of the flexible packaging with an adhesive tape for closing the packaging comprising a baking adhesive layer protected by a removable protective tab and in closing the packaging on its fourth side, by removing the tab to close the packaging with an adhesive assembly cord.

Various other characteristics will emerge from the description given below with reference to the appended drawings which show, by way of nonlimiting examples, embodiments of the subject of the invention.

Figure 1 illustrates an embodiment of a flexible packaging according to the invention shown on the side of its cooking side and before insertion of a food product to be cooked.

Figure 2 is an enlarged sectional view taken along the lines II-II of FIG. 1 and showing the structure of flexible packaging according to the invention.

Figure 3 illustrates a flexible packaging according to (Invention shown on the side of its cooking side and being closed.

Figures 4A and 4B are views respectively cooking side and 10 side presentation of a closed flexible packaging according to the invention.

Figure 5 is a view of a closed flexible package shaped to be placed, according to its cooking face, in relation to a source for cooking.

Figure 6 is a view of a flexible package opened by the separation of the two sheets after being placed in relation to a source 15 for cooking.

Figs. 1 and 2 represent an embodiment of a flexible packaging 1 in accordance with the invention delimiting an internal volume 2 accessible by an opening 3 to allow the introduction to (interior of the packaging, of food products to be cooked 4 such as fish or meat. After the food product 4 has been placed inside the packaging, the opening 3 is closed using a sealed closure system 5 for the packaging 1. so that the sealed packaging thus obtained is used directly for cooking the food product contained in (Interior of the packaging.

According to an application intended by the invention, the food products contained in such a packaging are intended to be cooked according to barbecue cooking, that is to say to be subjected to a cooking source S at high temperature illustrated schematically in the Fig. 5. This cooking source S allows barbecue cooking of food products at a temperature above 250 ° C. or advantageously above 300 ° C.

This barbecue cooking is carried out for a period of between 5 and 30 minutes depending on the temperature and the nature of the food product 4. This barbecue cooking source S can be carried out by all types of devices such as, for example, barbecues combustion using wood or charcoal, gas barbecues or electric barbecues.

The flexible packaging 1 comprises a first so-called composite sheet 6 and a second sheet 7 which are placed in a superimposed position with substantially identical dimensions. The package 1 can take different forms by presenting four sides 8 to form a package of square or rectangular shape.

According to the invention, the second sheet 7 is a metal sheet. According to an advantageous alternative embodiment, the second sheet 7 is an aluminum sheet. According to an advantageous alternative embodiment, the second sheet 7 is an embossed aluminum sheet. It should be understood that the second sheet 7 of the package has a single sheet and according to a preferred embodiment, a single sheet of embossed aluminum. This embossed aluminum sheet 7 thus has an external face 7e provided with recesses of all shapes and produced by any appropriate means and an internal face 7i constituting the internal surface of the packaging intended to be in contact with the product. food to be packaged. Typically, the embossed aluminum sheet 7 has a thickness of between 10 and 100 microns and advantageously between 15 and 60 microns.

The outer face 7e of the embossed aluminum sheet 7 is intended to be positioned facing the cooking source S. This embossed aluminum sheet 7 makes it possible to protect the composite sheet 6 from heat and avoids packaging to present sharp edges.

According to the invention, the composite sheet 6 comprises at least between a layer of aluminum 10 and a layer of heat-sealed plastic material resistant to high temperature 11, a layer 12 of binder resistant to high temperature. The composite sheet 6 thus has two external faces formed by the aluminum layer 10 and the heat-sealable plastic layer 11.

According to a preferred alternative embodiment, the layer of heat-sealable binder resistant to high temperature 12 is produced by an extrusion of polymers resistant to high temperature or by a co-extrusion of polymers resistant to high temperature. For example, it can be used as a binder layer, low density polyethylene (LDPE), polypropylene, polyester or glue.

According to an embodiment characteristic, the layer of heat-sealable plastic material resistant to high temperature 11 is produced for example from polypropylene. Advantageously, this layer of heat-sealable plastic material 11 is a polyethylene terephthalate. Advantageously, the layer of heat-sealable plastic material resistant to high temperature 11 is in the form of a film, an extrusion or a co-extrusion formed by the materials described above such as polypropylene or terephthalate. polyethylene. Typically, the layer of heat-sealable plastic material resistant to high temperature 11 has a thickness of between 8 and 40 microns.

According to a characteristic of the invention, the layer of heat-sealable plastic material 11 resistant to high temperature comprises on the side of the binder layer 12, a non-heat sealable face and on the side of the so-called food product contact face 11a of the sheet, a heat sealable face.

It should be noted that an alternative embodiment can be provided in which the composite sheet 6 also comprises a layer of high temperature resistant paper, interposed between the layer of heat-sealable plastic material 11 and the layer of heat-sealable binder 12.

As shown more precisely in FIG. 2, the composite sheet 6 is arranged so that the layer of heat-sealable plastic material 11 faces the embossed aluminum sheet 7 so as to constitute the internal surface of the flexible packaging intended to be in contact with the food product to be packaged . Thus, the plastic layer 11 has its face 11a, called the food product contact face, vis-à-vis the internal face 7i of the embossed aluminum sheet 7.

The composite sheet 6 has the layer of heat-sealable plastic material 11 opposite the embossed aluminum sheet 7 so as to allow heat-sealing or heat-sealing between the composite sheet 6 and the embossed aluminum sheet Ί. Thus, as the layer of heat-sealable plastic material 11 is disposed against the embossed aluminum sheet 7, the application of localized pressure on these two sheets 6, 7 at the sides or edges 8 of the packaging, completed by localized heating, the sheets 6, 7 can be welded together using heat-sealing cords T produced by the layer of heat-sealable plastic material resistant to high temperature 11.

The first composite sheet 6 and the second sheet 7 are assembled together in a sealed manner, at three sides 8 to leave the opening 3 on one side 8 of the packaging. Typically, the first composite sheet 6 and the second sheet 7 are assembled, at three sides 8 by heat-sealing cords T extending continuously at the edge of the three sides 8. There is thus formed a sealed package closed on three sides 8.

According to the invention, the heat-sealing cords T are rendered inactive after barbecue cooking, that is to say that the first composite sheet 6 and the second sheet 7 are no longer assembled together by these heat-sealing cords T at barbecue cooking term. Barbecue cooking corresponds to subjecting the sealed sealed packaging according to the invention to a cooking source S at a temperature above 250 ° C. or advantageously above 300 ° C. This barbecue cooking is carried out for a period of between 5 and 30 minutes depending on the temperature and the nature of the food product 4.

The layer of heat-sealable plastic material resistant to ia high temperature 11 is dimensioned to obtain your heat-sealing cords T ensuring the tight connection between the two sheets 6, 7 during transport and at least the start of barbecue cooking.

According to a characteristic of the invention, the composite sheet 6 comprising at least the aluminum layer 10, the plastic layer 11 and the binder layer 12 is heat sealable at a temperature between 100 ° C and 200 ° C and advantageously between 160 ° C and 190 ° C. The composite sheet 6 comprising the aluminum layer 10, the heat-sealable plastic layer 11 and the binder layer 12 is capable of withstanding a temperature at least equal to 120 ° C. for a minimum duration of at least 25 min. Indeed, it appears that a flexible packaging 1 comprising the composite sheet 6 in association with the embossed aluminum sheet 7 must be able to withstand a temperature at least equal to 120 ° C. for a minimum duration of 25 min to allow to cook, a conventional mass of a food product conditioned by such flexible packaging.

Advantageously, the composite sheet 6 is able to withstand a temperature at least equal to 140 ° C. for a minimum duration of 25 min.

The composite sheet 6 associated with the embossed aluminum sheet 7 is thus able to be subjected to a determined temperature for a period adapted to allow the cooking of the food product placed inside the flexible packaging while obtaining at the end of barbecue cooking, the separation between the composite sheet 6 associated with the embossed aluminum sheet 7.

It is recalled that after the introduction of the food product 4 inside the packaging, this packaging is closed along its fourth side 8 by an assembly cord, produced using the sealed closure system 5.

According to a first embodiment, the sealed closure system 5 is produced by a heat-sealing bead extending continuously at the edge of the fourth side 8 and produced from the layer of heat-sealable plastic material resistant to high temperature 11 and of a heat sealing operation. As already explained, such a heat sealing bead is rendered inactive after barbecue cooking like the other T heat sealing cords.

According to a second exemplary embodiment illustrated more particularly in FIGS. 1 to 3, the waterproof closure system 5 is formed by an adhesive tape for closing the repacking, making it possible to seal the packaging tightly along its fourth side, by an adhesive bead of assembly. This closing adhesive strip comprises a cooking adhesive layer 5a adhering to the food product contact face 11a of the plastic layer 11. This cooking adhesive layer 5a is protected by a detachable protective tab 5b.

The cooking adhesive layer 5a is adapted to be made inactive at the end of the barbecue cooking. Typically, this adhesive layer is an acrylic adhesive with good heat resistance. This adhesive layer is made inactive at the end of barbecue cooking, that is to say that the first composite sheet 6 and the second sheet 7 are no longer assembled together by the adhesive bead of assembly at the end of barbecue cooking. As already indicated, barbecue cooking corresponds to subjecting the sealed sealed packaging according to the invention to a cooking source S at a temperature above 250 ° C. or advantageously above 300 ° C. This barbecue cooking is carried out for a period of between 5 and 30 minutes depending on the temperature and the nature of the food product 4.

According to an advantageous characteristic of embodiment, the first composite sheet 6 has lines P for folding the edges of the packaging in the direction of said sheet (Fig. 4B). These lines P extend in correspondence of the sides of the packaging and beyond the heat-sealing cords T and the closure strip 5. Typically, these fold lines P are located a few centimeters away from the edges 8 of l 'packaging. As is clear from FIG. 5, it can thus be obtained after folding, a package having over its entire periphery raised edges so that the package is in the form of a container, the bottom of which is produced by the embossed aluminum sheet 7.

The implementation of the packaging 1 follows directly from the above description.

It should be considered that the flexible packaging according to the invention which has three sealed closed sides 8 is directly usable for packaging a food product 4 introduced inside the packaging, through its opening 3 (Fig. 1). After insertion of the food product and possibly of condiments, the packaging is closed on its fourth side by an assembly bead which in the illustrated example is produced, by a baking adhesive layer whose protective tab 5b has been previously detached (Fig. 3). As illustrated in your Figs. 4A and 4B, the packaging contains the food product while being hermetically sealed.

As shown more precisely in FIG. 5, the edges of the packaging are folded in the direction of the first sheet 6, along the fold lines P. After this shaping, the packaging has the shape of a container with raised edges whose bottom is formed by the second sheet 7.

The package 1 is then positioned so that the second sheet 7 is opposite the cooking source S (Fig. 5). The packaging is kept in relation to the cooking source S for example by resting on a grid by the second sheet 7. The packaging is left in relation to the cooking source in order to obtain the cooking of the food products at the end of which is obtained the rupture of the heat sealing cords and the assembly bead. As shown in FIG. 6, the first composite sheet 6 is thus detached from the second sheet 7 following cooking. The first composite sheet 6 can be removed in order to access the food product 4 which is contained possibly with its juice, 30 inside the second sheet 7 whose edges are raised along its entire periphery.

Claims (13)

1 - Flexible packaging of a watertight nature for food products, intended to be subjected to a heat source for cooking, the packaging comprising a first composite sheet (6) comprising at least between an outer aluminum layer (10) and a layer of heat-sealable plastic material resistant to high temperature (11), a layer of binder (12) heat-sealable resistant to high temperature, the first composite sheet (6) being superimposed on a second sheet (7) being joined together at the level from three watertight sides (8) and leaving an access opening (3) remaining at a fourth side (8), characterized in that the second sheet (7) is a metal sheet joined to the first sheet at level on three watertight sides by heat-sealing cords produced by the layer of heat-sealable plastic material resistant to high temperature (11) and rendered inactive after cooking sson barbecue and in that the fourth side (8) of the packaging is able to be provided with a system (5) for sealing the packaging sealed rendered inactive after barbecue cooking. 2 - Flexible packaging according to claim 1, characterized in that the fourth side of the first composite sheet (6) is provided as a sealed closure system (5), with an adhesive tape for closing the packaging comprising a baking adhesive layer protected by a detachable protective tab (5b) and (5a) adhering to the layer of heat-sealable plastic material resistant to high temperature (11). 3 - Flexible packaging according to one of the preceding claims, characterized in that the first composite sheet (6) is heat-sealable at a temperature between 100 ° C and 200 ° C and advantageously between 160 ° C and 190 ° C. 4 - Flexible packaging according to one of the preceding claims, characterized in that the first composite sheet (6) is capable of withstanding a temperature at least equal to 120 ° C and advantageously 140 ° C for a period of at least 25 mins. 5 - Flexible packaging according to one of the preceding claims, characterized in that the second sheet (7) is an aluminum sheet advantageously embossed. 6 - Flexible packaging according to one of the preceding claims, characterized in that it also comprises a layer of high temperature resistant paper interposed between the layer of heat-sealable plastic and the layer of heat-sealable binder. 7 - Flexible packaging according to one of the preceding claims, characterized in that the layer of heat-sealable binder resistant to high temperature (12) is produced by an extrusion of polymers resistant to high temperature or by a co-extrusion of polymers resistant to high temperature. 8 - Flexible packaging according to claim 1, characterized in that the layer of heat-sealable plastic (11) resistant to high temperature is made of polypropylene or preferably polyethylene terephthalate and has a thickness between 8 and 40 microns. 9 - Flexible packaging according to claim 8, characterized in that the layer of heat-sealable plastic (11) comprises on the side of the binder layer (12), a non-heat sealable face and on the side of the food product contact face (IIa ) of the sheet, a heat sealable side. 10 - Flexible packaging according to one of claims 5 to 9, characterized in that the aluminum foil (7) has a thickness between 10 and 100 microns and advantageously between 15 and 60 microns. 11 -Soft packaging according to one of claims 1 to 10, characterized in that the first composite sheet (6) has lines (P) for folding the edges of the packaging in the direction of said sheet, these lines for the folding extending in correspondence of the sides of the packaging and beyond the heat-sealing cords and the closure strip. 12 - Process for packaging food products until cooking, using flexible packaging intended to be subjected to a heat source (S) for cooking food products, characterized in that it comprises the following steps : - provide flexible packaging (1) according to one of claims 1 to 11; - introduction of food products (4) inside the packaging; - close the packaging on its fourth side with an assembly cord; - folding of the edges of the packaging in the direction of the first sheet (6); - positioning the packaging so that the second sheet (7) is opposite the heat source for cooking; - maintain the packaging in relation to the heat source for cooking (S) in order to obtain cooking of the food products and the rupture of the heat-sealing cords and the assembly cord; - And removal of the first composite sheet (6) detached from the second sheet (7) following cooking, in order to access the food products. 13 - Method according to claim 12, characterized in that it consists in providing the fourth side (8) of the flexible packaging with an adhesive tape for closing the packaging comprising a baking adhesive layer (5a) adhering to the layer of heat-sealable plastic material resistant to high temperature (11) and protected by a detachable protective tab (5b) and to close the packaging on its fourth side, removing the tab to close the packaging with an adhesive bead assembly.