Flan for packaging a portion of food in a prismatic envelope with a triangular base

Abstract

The invention relates to a blank comprising fold lines (6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i, 6j) which define: a quadrilateral side panel (4), two triangular lower (7) and upper (8) panels, a rear panel (14) and an edge having two outer bands (12) to form a sealing backing, and a front panel (27) arranged to form, in the extension of the backing, a sealing tab, a tear line (31) being arranged so that manually pulling on the tab induces a tear in said blank on either side of its tip, and then on either side of said upper panel. Figure 1

Description

Title of the invention: Flan for repackaging a portion of food in a prismatic envelope with a triangular base

[0001] The invention relates to a flan for the packaging of a portion of food, as well as a method of packaging a portion of food using such a flan.

[0002] It applies in particular to the packaging of individual food portions of fresh dairy products, such as, for example, fresh and / or processed cheese, which are packaged in a prismatic envelope with a triangular base formed by folding a blank.

[0003] To benefit from environmentally friendly packaging design, the flan according to the invention is preferably formed of a complex comprising an outer layer based on cellulosic fibers and an inner sealing layer.

[0004] To obtain a prismatic envelope with a triangular base, blanks are known that have folding lines arranged so as to define: - a side panel with quadrilateral geometry intended to form a side wall of the envelope; - two panels respectively lower and upper of triangular geometry each having an internal edge which is connected by a fold line to respectively a large external side of the side panel, said lower and upper panels being intended to form respectively a lower wall and an upper wall of the envelope; - two side panels each having a quadrilateral geometry having an internal edge which is connected by a fold line to respectively an external side of a panel respectively lower and upper, said side panels being intended to form together a side wall of the envelope; - a rear panel having a front edge which is connected by a fold line to a rear edge of the lower, side and upper panels, said rear panel being intended to form a rear wall of the envelope.

[0005] The blank also includes an edge having two outer bands, each having an inner edge which is connected by a fold line to respectively an outer edge of a side panel, said outer bands being arranged to be sealed to each other to form a sealing backing for the side wall of the enclosure

[0006] The backing ensures the packaging is airtight, but, particularly in relation to a flan containing a cellulose layer, the problem arises of how easily the packaging can be opened to allow consumption of the portion, in particular by young children and / or for soft portions.

[0007] In particular, opening and / or tearing the spine requires handling the packaging which, in addition to complex ergonomics, proves too restrictive for preserving the integrity of the portion.

[0008] The invention aims to improve the prior art by proposing a flan, in particular comprising a cellulose layer, for the packaging of a food portion, said flan making it possible to combine optimal sealing with good ergonomics of opening, in particular in relation to ease of opening for young children and / or the packaging of a soft portion.

[0009] To this end, according to a first aspect, the invention proposes a flan for packaging a portion of food comprising folding lines enabling the shaping of said flan into a prismatic envelope with a triangular base in which said portion can be packaged before closing said envelope, said folding lines defining a flan having: - a side panel with quadrilateral geometry intended to form a side wall of the envelope; - two panels respectively lower and upper of triangular geometry each having an internal edge which is connected by a fold line to respectively a large external side of the side panel, said lower and upper panels being intended to form respectively a lower wall and an upper wall of the envelope; - two side panels each having a quadrilateral geometry having an internal edge which is connected by a fold line to respectively an external side of a panel respectively lower and upper, said side panels being intended to form together a side wall of the envelope; - a border having two outer bands each having an inner edge which is connected by a fold line to respectively an outer edge of a side panel, said outer bands being arranged to be sealed to each other to form a sealing backing of the side wall of the envelope; - a rear panel having a front edge which is connected by a fold line to a rear edge of the lower, side and upper panels, said rear panel being intended to form a rear wall of the envelope; - a front panel having a rear edge which is connected by a fold line to a front edge of the outer bands and side panels, said front panel being intended to be sealed to form, in the extension of the back, a sealing tab of the tip of the packaging;

[0010] the blank comprising a tear line having two lateral segments extending over the upper panel along respectively a lateral edge of said panel from a rear area to a front area of ​​said panel, each of the segments extending from said front area to the outer edge of an outer strip by crossing a lateral panel, said tear line being arranged so that a manual pull on the sealing tab induces a tear of said blank on either side of its tip followed by propagation of said tear on either side of the upper wall.

[0011] According to a second aspect, the invention proposes a method for packaging a portion of food using such a flan, said method comprising: - fold the blank along its folding lines to form a prismatic envelope with a triangular base having a lower wall, two side walls, a top wall and an open rear mouth; - seal the outer bands of the border and the front panel to form a sealing backing of the side wall of the envelope and a sealing tab of the tip of the package; - place the portion in the packaging through the rear opening; - close said mouth tightly.

[0012] Other features and advantages of the invention will become apparent from the following description, made with reference to the accompanying figures, in which:

[0013] [Fig-1] schematically represents, in front and internal view, a blank according to a method of execution before folding;

[0014] [Fig.2a],

[0015] [Fig.2b],

[0016] [Fig.2c],

[0017] [Fig.2d],

[0018] [Fig.2e] and

[0019] [Fig.2f] represent in perspective following different orientations the side of the [Fig.l] during different stages of its folding to form a package;

[0020] [Fig.3a],

[0021] [Fig.3b] and

[0022] [Fig.3c] represent in perspective, following different orientations, different stages opening the packaging of the [Fig.2f].

[0023] In relation to these figures, a flan for the packaging of a food portion 1 is described below, as well as a method for packaging a food portion 1 using such a flan.

[0024] The flan is particularly suitable for packaging an individual portion of fresh dairy product, for example fresh and / or processed cheese.

[0025] The blank is formed of a complex 2 which has a sealing layer 2a with oxygen and / or water vapor barrier properties, in order to guarantee the preservation of the packaged food portion 1.

[0026] The sealing layer 2a can be made of a food-grade plastic material, particularly when it is intended to be in contact with the food portion 1 packaged in the packaging. For this purpose, the sealing layer 2a can be made of polyethylene (PE) and / or polyethylene terephthalate (PET), or of other known food-grade plastics, such as polyamide (PA), polypropylene (PP) or polylactic acid (PLA).

[0027] Advantageously, the complex 2 comprises an inner sealing layer 2a as described above, and an outer layer 2b based on cellulose fibers. In particular, the cellulose fibers may be derived from wood and processed by papermaking to form a layer of paper or cardboard, or be in the form of a nonwoven fabric.

[0028] Such an arrangement makes it possible to benefit from environmentally friendly packaging design. In particular, the outer layer 2b can be made from recycled cellulosic fibers.

[0029] According to one embodiment, the outer layer 2b has a surface mass between 30 g / m2 and 150 g / m2, in particular between 50 g / m2 and 110 g / m2, and more particularly in the order of 80 g / m2.

[0030] Advantageously, complex 2 comprises between 60% and 90% by weight of cellulosic fibers. To this end, the outer layer 2b may have a thickness of approximately 60 µm, and the inner layer 2a a thickness of between 4 µm and 20 µm.

[0031] To improve the overall sealing properties of the packaging, complex 2 may include at least one additional layer of film and / or varnish having suitable properties, in particular oxygen and / or water vapor barrier properties. In particular, the outer face of the outer layer 2b may be coated with an additional layer of varnish having anti-condensation properties.

[0032] Complex 2 may have decorations and / or markings, for example patterns and / or inscriptions of an aesthetic and / or commercial nature related to the food portion 1. These elements may be formed by printing and / or embossing directly on the outer layer 2b made of cellulosic fibers.

[0033] A method for packaging a food portion 1 in a flan formed in a complex 2 as described above is now described.

[0034] The process first involves forming on the blank fold lines 6a-6j arranged to allow the conformation of said blank into a prismatic envelope 3 with a triangular base, in which the food portion 1 can be conditioned before closing said envelope to form a package.

[0035]

[0036]

[0037]

[0038]

[0039] Advantageously, these folding lines 6a-6j are formed by grooving the outer layer 2b made of cellulosic fibers, which makes it easier to fold the blank while preserving the integrity of the sealing layer 2a. In relation to the figures, the process involves forming fold lines 6a-6j on the blank, so as to define: - a side panel 4 of quadrilateral geometry intended to form a side wall 5 of the envelope 3; - two panels respectively lower 7 and upper 8 of triangular geometry each having an internal edge 7a, 8a which is connected by a fold line 6a to respectively a large external side 4b of the side panel 4, said lower and upper panels being intended to form respectively a lower wall and an upper wall 9 of the envelope 3; - two side panels 10 each having a quadrilateral geometry having an internal edge 10a which is connected by a fold line 6b to respectively an external side 7b, 8b of a respectively lower panel 7 and upper panel 8, said side panels being intended to form together a side wall 11 of the envelope 3; - a border having two outer bands 12 each having an inner edge 12a which is connected by a fold line 6d to respectively an outer edge 10b of a side panel 10, said outer bands being arranged to be sealed to each other to form a sealing back 13 of the side wall 11 of the envelope 3; - a rear panel 14 having a front edge 14a which is connected by a fold line 6c to a rear edge 7c, 4a, 8c, lOd of the lower 7, side 4, 10 and upper 8 panels, said rear panel being intended to form a rear wall 15 of the envelope 3. The lower panel 7 and upper panel 8 each have an isosceles triangle geometry, the base of which forms the rear edge 7c, 8c which is defined by the fold line 6c separating said lower panel from the rear panel 14. The outer bands 12 of the border extend to the rear edge 16 of the blank, and the border has a rear band 17 which extends between the rear ends of said outer bands and all along the rear edge 16 of said blank, said rear band being connected by a fold line 6e to a rear edge 14b of the rear panel 14, being arranged to be sealed upon itself to form a sealing hem 18 of the rear wall 15 of the package. In relation to Figures 2a to 2d, the packaging process involves folding the blank along its fold lines 6a, 6b, 6c, 6d, 6e to form a prismatic envelope 3 with a triangular base having a bottom wall, two side walls 5, 11, and a wall upper 9 and an open rear mouth 19.

[0040] To achieve this, the process involves successively folding: - the lines 6a defining the large external sides 4b of the side panel 4, so as to erect the lower panels 7 and upper panels 8 to form the lower and upper walls 9 of the envelope 3 ([Fig.2a]); - lines 6b defining the respective external edges 7b, 8b of the lower panel 7 and upper panel 8, so as to fold down the side panels 10 opposite the side panel 4 to form the side wall 11 of the envelope 3 ( [Fig.2b]); - the lines 6d defining the respective external edges 10b of the side panels 10, so as to erect the external bands 12 of the border by arranging their respective internal faces against each other (figures 2c, 2d).

[0041] In particular, at the end of these folding steps, an envelope 3 is obtained with an open rear mouth 19 (figures 2c, 2d), and the inner face of the rear band 17 of the border delimits an inner periphery of said rear mouth.

[0042] The process then involves sealing the outer bands 12 of the border, so as to form a sealing back 13 of the side wall 11 of the envelope 3.

[0043] To do this, the process involves depositing a layer of adhesive on the respective inner faces of the outer strips 12, so as to form the sealing backing 13 by a "flesh-to-flesh" type sealing of said outer strips.

[0044] The adhesive can be a hot melt glue or a cold glue, so as to ensure a permanent and watertight seal of the back 13.

[0045] In particular, as the outer bands 12 extend to the rear edge 16 of the side, their sealing makes it possible to obtain a sealing backbone 13 which closes the periphery of the rear mouth 19.

[0046] Next, as shown in [Fig.2c], the dorsal 13 is folded down onto the lateral wall 11 of the envelope 3 after it has been sealed.

[0047] The process then involves packaging the food portion 1 in the packaging through the rear mouth 19, and then folding the rear panel 14 to close said mouth.

[0048] Thus, the process makes it possible to form a mold by means of the envelope 3, into which the food portion 1 can be poured in liquid or viscous form before closing said envelope, which makes it possible to limit production costs by eliminating an additional step of shaping said food portion before packaging.

[0049] This arrangement also makes it possible to produce food portions 1 packaged more hygienically and with better preservation conditions. Indeed, Pouring portion 1 directly into its individual packaging limits its exposure to ambient air, thus reducing the risk of contamination, particularly by germs. Furthermore, pouring portion 1 at a temperature higher than the pasteurization temperature further enhances its preservation properties.

[0050] To fold the rear panel 14, the method involves extending the fold lines 6a, 6b and / or 6d defining the external edges 4b, 7b, 8b and / or 10b and internal edges 7a, 8a, 10a of the lower 7, side 4, 10 and upper 8 panels onto said rear panel, so as to form lower 20, side 21 and upper 22 sectors, said folding being carried out by folding the side sectors 21 flat to fold down the upper 22 and lower 20 sectors, as shown in [Fig.2e].

[0051] In order to be able to close the mouth 19 in a watertight manner, the process then involves: - folding the rear band 17 flat, by placing an upper portion of the inner face of said rear band on a lower portion of said inner face; - seal the inner face of the back band 17, by a "flesh-to-flesh" type association of its upper and lower portions, in order to form the sealing hem 18 of the back wall 15.

[0052] This embodiment allows in particular a continuous sealing of the inner face of the rear band 17, guaranteeing optimal sealing due in particular to the absence of any excess thickness in said sealing.

[0053] To enable the sealing of the rear band 17, the process involves first depositing a layer of adhesive on its inner face, in particular an adhesive similar to that disposed on the outer bands 12 of the border to form the lateral sealing backing 13.

[0054] In the embodiment shown, the method involves extending the fold lines 6a, 6b and / or 6d of the rear panel 14 onto the rear band 17 of the border, so as to form on said rear band lower 23, lateral 24 and upper 25 sectors in the rear extension of the corresponding sectors 20, 21, 22 of said rear panel.

[0055] Thus, as shown in [Fig.2e], the flat folding of the rear strip 17 is achieved by placing the inner face of the upper sector 25 on the inner face of the lower sector 23, and by folding the inner face of each of the lateral sectors 24 onto itself.

[0056] In particular, the different folding lines 6a, 6b and / or 6d are extended in a straight line, which makes it easier to manufacture the blank and fold the envelope 3.

[0057] The method involves forming, on the respective lateral sectors 21, 24 of the panel rear 14 and rear band 17, a 6f pattern of folding lines which is arranged to allow them to fold flat.

[0058] In particular, as shown in Figures 1, 2a, 2b, 2c and 2d, each pattern of fold lines forms a triangle 6f extending a lateral sector 21 of the rear panel 14, the base of the triangle 6f being formed by the front edge of said lateral sector and the apex of said triangle being disposed on the rear edge of said lateral sector, said apex being extended by a fold line 6g extending over the lateral sector 24 of the rear band 17 to the rear edge 16 of said rear band.

[0059] Advantageously, as shown in [Fig.1], the blank has symmetry with respect to the axis defined by the fold line 6g of the lateral sector 24 located at the rear of the central lateral panel 4 (vertical in [Fig.1]), which makes it easier to manufacture said blank and fold the envelope 3.

[0060] The process further provides for forming, on each of the upper sectors 22, 25 and lower sectors 20, 23: - an internal 6h section of the folding line extending from the intersection between the front edge and the internal edge of the upper sector 22 - respectively lower 20 - of the rear panel 14, to the rear edge 16 of the side; and - an external section 6i of fold line which extends from the intersection between the front edge and the external edge of the upper sector 22 - respectively lower 20 - of the rear panel 14, to the rear edge 16 of the side.

[0061] In relation to figures 2e and 2f, the different patterns 6f and sections 6h, 6i of fold lines formed on the lateral sectors 21, upper 22 and lower 20 of the rear panel 14 make it possible to make a fold of said lateral sectors which forms two lateral gussets 26 of triangular geometry, each lateral sector 21 being folded towards the inside of the packaging and on either side of the rear wall 15.

[0062] In particular, after folding the side gussets 26, the rear band 17 is sealed, then the sealing hem 18 thus formed is folded over a lower portion of the rear wall 15 of the envelope 3.

[0063] In an alternative not shown, the sealing of the rear mouth 19 can be carried out by folding the side sectors 21 flat to form triangular gussets 26 which extend outwards from the packaging and then, after sealing the rear band 17 and folding the sealing hem 18 on the rear wall 15, by folding each of said outer gussets down onto the adjacent side wall 5, 11.

[0064] To facilitate the opening of the packaging, particularly by young children and / or in relation to a soft food portion 1, the process provides for forming the fold lines so that the blank also has a front panel 27, which has a rear edge 27a connected by a fold line 6j to a front edge 12b, 4c, 10c of the outer bands 12 and of the side panels 4, 10.

[0065] Each of the fold lines 6a defining the external edges 4b of the central side panel 4 extends to the front edge 27b of the front panel 27, forming, on either side of said line, an external sector 28, in the continuation of an external side panel 10 and an adjacent external band 12, and a central internal sector 29.

[0066] In particular, the top of each of the upper 8 and lower 7 panels opens at the intersection between the internal sector 29 and one of the external sectors 28.

[0067] In relation to [Fig.2b], the front panel 27 is intended to be sealed to form, in the extension of the spine 13, a sealing tab 30 for the tip of the packaging.

[0068] To do this, the process involves depositing a layer of adhesive, in particular similar to that used on the back 13 and the rear hem 18, on the inner face of the front panel 27, so as to allow the formation of the tab 30 by "flesh-to-flesh" type sealing of said front panel.

[0069] As shown in Figures 2c and 2d, the method provides, after sealing the upper dorsal fin 13 and the front tab 30, for: - fold the dorsal 13 onto the lateral wall 11 of the envelope 3, so as to position horizontally the external part of the tab 30, formed by sealing the external sectors 29; - fold down onto the other side wall 5 the part of the tab 30 protruding in front of the tip of the packaging.

[0070] The method further provides for forming on the side a tear line 31 which has two lateral segments 31a extending over the upper panel 8 along respectively a lateral edge 8a, 8b of said panel, from a rear area to a front area of ​​said panel, each of the segments 31a extending from said front area to the outer edge 12c of an outer band 12 by crossing a lateral panel 10.

[0071] The tear line 31 is arranged so that a manual pull on the sealing tab 30 induces a tear in the side on either side of its tip, followed by propagation of said tear on either side of the upper wall 9.

[0072] Thus, the flan makes it possible to provide the consumer with a package with a rigid tab 30 whose large dimensions make it easier to grasp digitally, said tab also forming a lever arm to facilitate the initiation of the tear of said package along the line 31 formed for this purpose in said package.

[0073] In particular, each lateral segment 31a of the tear line 31 extends parallel to respectively a lateral edge 8a, 8b of the upper panel 8.

[0074] This arrangement allows the consumer to open the packaging from either side of the front point and on the upper wall 9 of the envelope 3, and in particular outside the sealing back 13, which is offset on a lateral wall 11 of said envelope, being crossed on its front area by a portion of the tear line 31.

[0075] Thus, the consumer does not need to open the spine 13 to open the packaging, which makes it possible to optimize the sealing of said spine during the storage of the packaged food portion 1 and to facilitate access to said food portion when opening its packaging, in particular thanks to the presence of a portion of the tear line 31 on a front area of ​​said spine.

[0076] Advantageously, the lateral segments 31a of the tear line 31 delimit between themselves and on the upper wall 9 of the envelope 3 a tearable zone whose surface area is greater than at least 80%, and in particular greater than 95% of the total surface area of ​​said upper wall.

[0077] To achieve this, each lateral segment 31a extends in particular over more than 90% of the length of the adjacent lateral edge 8a, 8b, while having an intrinsic length which remains less than 100% of said lateral edge length 8a, 8b, in order to guarantee the separation of the tip from the rest of the packaging when it is opened.

[0078] Thus, the tear line 31 makes it possible to form in the envelope 3 a large opening to facilitate the extraction of the food portion 1 from the packaging.

[0079] In particular, each lateral segment 31a of the tear line 31 extends along the adjacent lateral edge 8a, 8b, forming a band 32 between them, such that, after opening the packaging, each band 32 rests on an upper wall of the food portion 1, thereby holding a lateral wall 5, 11 of the wrapper 3 to which it is attached in support. This arrangement allows the food portion 1 to be laterally held against the lower wall of the wrapper 3, pending its removal by the consumer, as shown in [Fig. 3c].

[0080] Each of the strips 32 has a width that is less than 10% of the width of the side panel 4 or the sum of the widths of the adjacent side panel 10 and outer edge 12, and in particular less than 5% of said width or sum of said widths. This arrangement makes it easier for the consumer to remove the food portion 1, who then simply has to pull apart the side panels 5, 11 to remove said food portion from the lower wall of the wrapper 3 while maintaining its shape, particularly in the case of a soft food portion 1.

[0081] Each lateral segment 31a has, at the junction between its front extension on the corresponding lateral panel 4, 10, a connecting elbow of curved geometry, the radius of curvature of which is arranged to guarantee a tear all along said segments.

[0082] Each lateral segment 31a of the tear line 31 extends in a straight line to the rear edge 8c of the upper panel 8, and continues in particular on the rear panel 10, as shown in figures 2a, 2b, 2c, 2d, 2e, 2f, 3a, 3c.

[0083] In an alternative not shown, and in a particularly advantageous way, the lateral segments 31a can each open into the section 6h, 6i of the adjacent folding line of the upper sector 22.

[0084] Thus, by continuing his pulling effort on the tab 30, the consumer can partially, but not totally, tear the rear wall 15 of the envelope 3, so as to keep the food portion 1 between the untorn portion of the rear wall 15 and the side walls 5, 11, while waiting for the extraction of said food portion from the packaging by said consumer.

[0085] Furthermore, the lower panel 7 is devoid of a tear line, in order to remain attached to the envelope 3 after opening the packaging, thus forming a tray on which the food portion 1 can be held until it is taken by the consumer.

[0086] According to one embodiment, the tear line 31 is obtained by partially pre-cutting the thickness of the blank, in particular by removing material, to a sufficient depth to form a weakening line that guides the tear of said blank along said line. Advantageously, the line 31 can be formed by laser cutting with different parameters at the connecting bends described above, in order to facilitate tearing along said bends.

[0087] To preserve the integrity of the inner layer 2a, and therefore the sealing of the packaging, the tear line 31 is formed by at least partial removal of only the outer layer 2b.

[0088] Advantageously, the tear line 31 is formed, for example by laser cutting or by mechanical cutting, over approximately 4 / 5 of the total thickness of the outer layer 2b, which allows a good compromise between preserving the sealing of the packaging and the ease of opening it by tearing along said line.

[0089] According to another embodiment, the tear line 31 allows the tearing of the blank to be guided without prior pre-cutting of said blank, for example by means of a folding or grooving line of the blank, and / or a particular orientation of the fibers of the outer layer 2b along said line.

Claims

Demands

1. A flan for packaging a portion of food (1) comprising folding lines (6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i, 6j) enabling the flan to be formed into a triangular prismatic envelope (3) in which said portion can be packaged before closing said envelope, said folding lines defining a flan having: - a side panel (4) of quadrilateral geometry intended to form a side wall (5) of the envelope (3); - two panels respectively lower (7) and upper (8) of triangular geometry each having an internal edge (7a, 8a) which is connected by a fold line (6a) to respectively a large external side (4b) of the side panel (4), said lower and upper panels being intended to form respectively a lower wall and an upper wall (9) of the envelope (3); - two side panels (10) each having a quadrilateral geometry having an internal edge (10a) which is connected by a fold line (6b) to respectively an external side (7b, 8b) of a respectively lower (7) and upper (8) panel, said side panels being intended to form together a side wall (11) of the envelope (3); - a border having two outer bands (12) each having an inner edge (12a) which is connected by a fold line (6d) to respectively an outer edge (10b) of a side panel (10), said outer bands being arranged to be sealed to each other to form a sealing backing (13) of the side wall (11) of the envelope (3); - a rear panel (14) having a front edge (14a) which is connected by a fold line (6c) to a rear edge (7c, 4a, 8c, 10d) of the lower (7), side (4, 10) and upper (8) panels, said rear panel being intended to form a rear wall (15) of the envelope (3); said flan being characterized in that it comprises a front panel (27) having a rear edge (27a) which is connected by a fold line (6j) to a front edge (10c, 4c, 12b) of the outer bands (12) and the side panels (4, 10), said front panel being intended to be sealed to form, in the extension of the spine (13), a sealing tab (30) of the tip of the package, and in that said blank comprises a tear line (31) having two lateral segments (31a) extending over the top panel (8) along respectively a lateral edge (8a, 8b) of said panel from a rear area to a front area of ​​said panel, each of the segments (31a) extending from said front area to the outer edge (12c) of an outer band (12) by passing through a side panel (10),said tear line being arranged so that a manual pull on the sealing tab (30) induces a tear in said blank on either side of its tip followed by propagation of said tear on either side of the upper wall (9).

2. Flan for the packaging of a food portion (1) according to claim 1, characterized in that each lateral segment (31a) of the tear line (31) extends parallel to respectively a lateral edge (8a, 8b).

3. Flan for the packaging of a food portion (1) according to any one of claims 1 or 2, characterized in that each lateral segment (31a) of the tear line (31) extends along the adjacent lateral edge (8a, 8b) forming a band (32) between them.

4. Flan for the packaging of a food portion (1) according to any one of claims 1 to 3, characterized in that each lateral segment (31a) of the tear line (31) extends to the rear edge (8c) of the top panel (8).

5. Flan for the packaging of a food portion (1) according to claim 4, characterized in that each lateral segment (31a) of the tear line (31) extends onto the back panel (14).

6. Flan for the packaging of a food portion (1) according to any one of claims 1 to 5, characterized in that the folding lines (6a, 6b, 6d) defining the external (4b, 7b, 8b, 10b) and internal (7a, 8a, 10a) edges of the lower (7), lateral (4, 10) and upper (8) panels extend, in particular in a straight line, onto the rear panel (14) to form lower (20), lateral (21) and upper (22) sectors on said rear panel.

7. Flan for packaging a portion of food (1) according to one of any of claims 1 to 6, characterized in that the border has a back band (17) which is connected by a fold line (6e) to a back edge (14b) of the back panel (14), said back band being arranged to be sealed on itself to form a sealing hem (18) of the back wall (15) of the package.

8. Flan for the packaging of a food portion (1) according to claims 6 and 7, characterized in that the back strip (17) has lower (23), lateral (24) and upper (25) sectors in the rear extension of the corresponding sectors (20, 21, 22) of the back panel (14), the lateral sectors (21, 24) of the back panel (14) and of the back strip (17) each having a pattern (6f, 6g) of fold lines which is arranged to permit the flat sealing of the back strip (17).

9. Flan for packaging a portion of food (1) according to any one of claims 6 to 8, characterized in that the upper sector (22, 25) has an internal (6h) - respectively external (6i) - section of fold line extending from the intersection between the front edge and the internal - respectively external - edge of the upper sector (22) of the rear panel (10) to the rear edge (16) of the flan.

10. Flan for the packaging of a food portion (1) according to any one of claims 1 to 9, characterized in that it is formed of a complex (2) comprising an outer layer (2b) based on cellulosic fibers and an inner sealing layer (2a).

11. Flan for the packaging of a food portion (1) according to claim 10, characterized in that the tear line (31) is formed by at least partial removal of only the outer layer (2b).

12. Flan for the packaging of a food portion (1) according to any one of claims 10 or 11, characterized in that the folding lines (6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i, 6j) are formed by creasing the outer layer (2b).

13. A method for packaging a portion of food (1) using a flan according to any one of claims 1 to 12, said method comprising: - folding the flan along its fold lines (6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i, 6j) to form a prismatic envelope (3) with a triangular base having a lower wall, two side walls (5, 11), a top wall (9) and a rear opening (19) open; seal the outer bands (12) of the border and the front panel (27) to form a sealing backing (13) of the side wall (11) of the envelope (3) and a sealing tab (30) of the tip of the package; package the portion (1) in the packaging through the rear opening (19); close the said mouth tightly.

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