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 a manual pull on the tab induces a tear in said blank along its tip followed by propagation of said tear on both sides of its side wall. 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 packaging 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 flan.

[0003] To benefit from an 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 lower and upper panels of triangular geometry, each having an internal edge which is connected by a fold line to a large external side of the side panel, said lower and upper panels being intended to form a lower wall and an upper wall of the envelope respectively; - 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 lower and upper panel, 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 lower and upper panels of triangular geometry, each having an internal edge which is connected by a fold line to a large external side of the side panel, said lower and upper panels being intended to form a lower wall and an upper wall of the envelope respectively; - 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 an internal 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 an internal 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 spine, a sealing tab for the tip of the packaging;

[0010] the blank comprising a tear line having two lateral segments

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[0026] extending over a side panel respectively along the inner edge of said panel from a front area to a rear area of ​​said panel, each of the segments extending from said rear area over the lower and upper panels respectively towards the side panel, said tear line being arranged so that a manual pull on the sealing tab induces a tear of said blank along its tip followed by propagation of said tear on both sides of its side wall. 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. Other features and advantages of the invention will become apparent in the following description, made with reference to the accompanying figures, in which: [Fig.l] schematically represents, in front and external view, a blank according to an embodiment before its folding; [Fig.2a] [Fig.2b], [Fig.2c], [Fig.2d] [Fig.2e] [Fig.2f] and [Fig.2g] represent in perspective, following different orientations, the side of the [Fig.l] during different stages of its folding to form a package; [Fig.3a] [Fig.3b], [Fig.3c], [Fig.3d] and [Fig.3e] represent in perspective, following different orientations, different stages of opening the packaging of [Fig.2g]. 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.

[0027] The flan is particularly suitable for packaging an individual portion of fresh dairy product, for example fresh and / or processed cheese.

[0028] The flan 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.

[0029] 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).

[0030] 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 non-woven fabric.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] A method for packaging a food portion 1 in a flan formed in a complex 2 as described above is now described.

[0037] The process first involves forming folding lines 6a-6j on the blank arranged to allow the shaping of said flan into a prismatic envelope 3 with a triangular base, in which the food portion 1 can be packaged before closing said envelope to form a package.

[0038] 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.

[0039] In relation to the figures, the process involves forming fold lines 6a-6j on the blank, so as to define therein: - 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 33 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.

[0040] 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.

[0041] 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 on itself to form a sealing hem 18 of the rear wall 15 of the package.

[0042] In relation to figures 2a to 2e, the packaging process involves folding the blank along its folding lines 6a, 6b, 6c, 6d, 6e to form a prismatic envelope 3 with a triangular base having a lower wall, two side walls 5,11, a top wall 9 and an open rear mouth 19.

[0043] To achieve this, the process involves successively folding: 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]); 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 ([Fig.2b]).

[0044] In particular, at the end of these folding steps, an envelope 3 is obtained with an open rear mouth 19 (figures 2c, 2d, 2e), and the inner face of the rear band 17 of the border delimits an inner periphery of said rear mouth.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] This arrangement also allows for the production of food portions 1 that are packaged more hygienically and with better preservation conditions. Indeed, by pouring the food portion 1 directly into its individual packaging, its exposure to ambient air is limited, thus reducing the risk of contamination, particularly by germs. Furthermore, if the food portion 1 is poured at a temperature higher than the pasteurization temperature, this further improves its preservation properties.

[0053] 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 Figures 2e and 2f.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] In particular, the various folding lines 6a, 6b and / or 6d are extended in a straight line, which facilitates the manufacture of the blank and the folding of envelope 3.

[0060] The method involves forming, on the respective lateral sectors 21, 24 of the rear panel 14 and the rear band 17, a pattern 6f of fold lines which is arranged to allow them to be folded flat.

[0061] In particular, as shown in Figures 1, 2a, 2b, 2c, 2d and 2e, 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] To facilitate opening the packaging, particularly by young children and / or in connection with a soft food portion, the method involves 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.

[0068] 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.

[0069] In particular, the top of each of the upper 8 and lower 7 panels opens onto the intersection between the internal sector 29 and one of the external sectors 28.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] The method further provides for forming on the side a tear line 31 which has two lateral segments 31a extending respectively on an external side panel 10, along the internal edge 10a of said panel, from a front area to a rear area of ​​said panel, each of the segments 31a extending from said rear area on the respectively lower panel 7 and upper panel 8 towards the side panel 4.

[0074] The tear line 31 is arranged so that a manual pull on the sealing tab 30 induces a tear in the blank along its tip, followed by propagation of said tear on either side of its lateral wall 11 bearing the sealing back 13.

[0075] 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 making it easier to initiate the tearing of said package along the line 31 formed for this purpose in said package.

[0076] In particular, each lateral segment 31a of the tear line 31 extends parai- element to respectively an internal edge 10a of an external side panel 10.

[0077] Similarly, each lateral segment 31a extends parallel to a rear edge 7c, 8c of the lower panel 7 or upper panel 8 respectively.

[0078] These arrangements allow the consumer to open the packaging along the front tip, and then successively on: - the side wall 11 of the envelope 3 formed by folding the external panels 10, and on which the sealing back 13 is offset; - the rear wall 15 formed by sealing the hem 18 after pouring the food portion 1 into said envelope.

[0079] Thus, the consumer does not need to open the spine 13 and / or the hem 18 to open the packaging, which makes it possible to optimize the sealing of said spine and said hem during the storage of the packaged food portion 1 and to facilitate access to said food portion when opening its packaging.

[0080] In the embodiment shown, the lateral segments 31a of the tear line 31 each extend over more than 90% of the length of the adjacent inner edge 10a, while having an intrinsic length that remains less than 100% of said inner edge length 10a, in order to ensure propagation of the tear at the level of the rear wall 15.

[0081] Similarly, each lateral segment 31a extends over more than 90%, and preferably over about 100% of the length of the rear edge 7c, 8c of the lower panel 7 or upper panel 8, so as to be able to tear most of the rear wall 15 of the package when it is opened, and thus facilitate the extraction of the food portion 1 by separating the lower panel 7 and / or upper panel 8, as shown in Figures 3d and 3e.

[0082] Advantageously, the lateral segments 31a of the tear line 31 are arranged so as to delimit, on each of the lateral wall 11 and rear wall 15 of the envelope 3, a tearable area whose surface area is greater than at least 80%, and in particular greater than 95% of the total surface area of ​​the corresponding wall 11,15.

[0083] 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.

[0084] Alternatively, the tear line 31 may include a central segment extending over the rear panel 4, in particular in the vicinity of and parallel to its front edge 4c, between the front ends of the lateral segments 31a in order to facilitate the initiation of tearing.

[0085] Each lateral segment 31a of the tear line 31 extends along the adjacent inner edge 10a, forming a band 32 between them, such that, after opening the package, each band 32 rests on a lateral wall of the food portion 1, so as to hold in contact with it an upper wall 9 or in- lesser 33 of envelope 3 to which it is attached.

[0086] This arrangement allows the food portion 1 to be laterally wedged between the lower wall 33 and upper wall 9 of the envelope 3, pending its extraction by the consumer, as shown in [Fig.3c].

[0087] Each of the bands 32 has a width that is less than 10% of the sum of the widths of the adjacent side panel 10 and outer edge 12, and in particular less than 5% of said sum of widths. This arrangement makes it easier for the consumer to remove the food portion 1, who simply has to separate the upper 9 and lower 33 walls ([Fig. 3e]) to remove said food portion from the wrapper 3 while maintaining its shape, particularly in the case of a soft food portion 1. Alternatively, the width of the bands 32 can be 50%, or even 70%, of the sum of the widths of the adjacent side panel 10 and outer edge 12.

[0088] Each lateral segment 31a of the tear line 31 extends from the rear area of ​​the corresponding side panel 10 to a central area of ​​the respective upper panel 8 or lower panel 7, and continues in particular onto the rear panel 14 from said central area. Alternatively, each lateral segment 31a of the tear line 31 may extend onto the respective upper panel 8 or lower panel 7 to the corresponding inner edge 7a, 8a.

[0089] According to the embodiment shown, each lateral segment 31a opens into the section 6h of the internal folding line of the corresponding upper sector 22 or lower sector 20.

[0090] Thus, the propagation of the tear in the rear wall 15 stops at the junction with the side wall 5 opposite the sealing spine 13, so as to maintain the food portion 1 between this side wall 5 and the upper 9 and lower walls 33, pending the extraction of said food portion from the packaging by said consumer.

[0091] In particular, each lateral segment 31a has, at the junction between the rear area of ​​the side panel 10 and the upper panel 8 or lower panel 7, as well as at its passage between said upper or lower panel and the rear panel 14, connecting elbows of curved geometries, whose respective radii of curvature are arranged to ensure a tear all along said segments.

[0092] Each lateral segment 31a extends: - along the rear edge 7c, 8c of the corresponding lower panel 7 or upper panel 8, forming a second band 34 between them; and - on the rear panel 14 by forming a third band 35 with the rear edge 7c, 8c of said upper or lower panel.

[0093] These bands 34, 35 also have a reduced width, in particular less than 10% of the width of the rear wall 15, and preferably less than 5% of said rear wall width, so as to facilitate the extraction of food portion 1 from the packaging.

[0094] Advantageously, as shown in [Fig. 3d], the bands 32, 35 are arranged to secure the food portion 1 to the corresponding upper 9 or lower 33 wall. Thus, after opening the packaging, the consumer can pull away one of the upper 9 or lower 33 walls from the food portion 1, the latter then resting on the other of said upper and lower walls, which forms a tray to allow the consumer, in particular, to limit contact of their fingers with said food portion.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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 (33) 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 (4), 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) comprising 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 side panels (4, 10), said front panel being intended to be sealed to form, in line with the spine (13), a sealing tab (30) at the tip of the package, and in that the blank comprises a tear line (31) having two lateral segments (31a) extending respectively on a side panel (10) along the inner edge (10a) of said panel from a front area to a rear area of ​​said panel, each of the segments (31a) extending from said rear area on the respectively lower (7) and upper (8) panels towards the side panel (4), said tear line being arranged so that a manual pull on the sealing tab (30) induces a tear in said blank along its tip followed by propagation of said tear on either side of its lateral wall (11).

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 an internal edge (10a).

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 inner edge (10a) 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 parallel to a rear edge (7c, 8c) of the lower (7) or upper (8) panel.

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 along the rear edge (7c, 8c) forming a band (34) between them.

6. Flan for the packaging of a food portion (1) according to any one of claims 1 to 5, characterized in that each lateral segment (31a) of the tear line (31) extends to a central area of ​​the respectively upper (8) or lower (7) panel, said segment extending onto the rear panel (14) from said central area.

7. Flan for packaging a portion of food (1) according to claim dication 6, characterized in that each lateral segment (31a) of the tear line (31) extends over the rear panel (14) forming a band (35) with the rear edge (7c, 8c) of the lower (7) or upper (8) panel.

8. Flan for the packaging of a portion of food (1) according to any one of claims 1 to 7, 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.

9. Flan for packaging a portion of food (1) according to any one of claims 1 to 8, characterized in that the edge 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 packaging.

10. Flan for the packaging of a food portion (1) according to claims 8 and 9, 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).

11. A flan for packaging a portion of food (1) according to any one of claims 8 to 10, characterized in that each of the upper (22, 25) and lower (20, 23) sectors has a section (6h) of a fold line extending from the intersection between the front edge and the inner edge of the upper (22) or lower (20) sector of the back panel (14) to the rear edge (16) of the flan, each of the lateral segments (31a) of the tear line (31) opening into said section of fold line.

12. Flan for the packaging of a portion of food (1) according to any one of claims 1 to 11, 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).

13. Flan for packaging a portion of food (1) according to claim- dication 12, characterized in that the tear line (31) is formed by at least partial ablation of only the outer layer (2b).

14. Flan for the packaging of a food portion (1) according to any one of claims 12 or 13, characterized in that the folding lines (6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i, 6j) are formed by creasing the outer layer (2b).

15. A method for packaging a portion of food (1) using a flan according to any one of claims 1 to 14, said method comprising: - fold the blank along its folding 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 lateral walls (7), an upper wall (9) and an open rear mouth (17); - seal the outer bands (12) of the border and the front panel (27) to form a sealing backing (13) of the side wall (9) of the envelope (3) and a sealing tab (30) of the tip of the package; - to package the portion (1) in the packaging through the rear opening (17); - close said mouth tightly.

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