Blank for packaging food parts and method for packaging food parts

Abstract

The invention relates to a blank comprising fold lines (6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i, 6j, 6k) defining: a triangular bottom panel (4), two quadrilateral side panels (5), two triangular top panels (8), a rear panel (10) and a boundary piece having: two outer strips (12) to form a sealed backing; and two front strips (25) arranged so as to form a sealing pull tab as an extension from the backing, a tear line (30) arranged such that manual pulling of the pull tab causes the blank to tear from the apex of the bottom panel (4) to the top panel (8), and then tear on both sides of said top panel.

Description

Technical Field

[0001] The present invention relates to a blank for packaging food portions and to a method of packaging food portions using such a blank.

[0002] The invention is particularly suitable for packaging individual food portions of fresh dairy products (eg fresh cheese and / or melted cheese) in a prismatic envelope having a triangular base formed by folding a blank. Background Art

[0003] In order to benefit from eco-designed packaging, the blank according to the invention is preferably made of a composite comprising an inner sealing layer and an outer layer based on cellulose fibers.

[0004] In order to obtain a prismatic envelope with a triangular base, it is known to provide a blank with folding lines arranged so as to define:

[0005] - a bottom panel having a triangular geometry, said bottom panel being intended to form the bottom wall of the envelope;

[0006] - two side panels having a quadrilateral geometry, each having an inner edge connected to a respective long outer side of the bottom panel by a folding line, said side panels being intended to form respective side walls of the envelope;

[0007] - two top panels, each having a triangular geometry with a large inner edge connected to the corresponding outer side of the side panels by folding lines, the top panels being intended to jointly form the upper wall of the envelope;

[0008] - a rear panel having an inner edge connected to the rear edges of the bottom, side and top panels by fold lines, said rear panel being intended to form the rear wall of the envelope.

[0009] The blank also includes a border piece having two outer strips each having an inner edge connected to a corresponding large outer edge of the top panel by a fold line, the outer strips being arranged to seal to each other to form a sealing backing for the top wall of the envelope.

[0010] The sealing backing ensures the waterproofness of the package, but especially with blanks comprising a cellulose layer there is the problem of how to conveniently open the package to enable consumption of the food portion, especially by young children and / or in the case of soft portions.

[0011] In particular, opening and / or tearing the backing requires package manipulation which, besides being ergonomically complex, can be overly restrictive and make it impossible to maintain the integrity of the food portion. Summary of the Invention

[0012] The present invention aims to improve the prior art by proposing a blank for packaging food portions, in particular a blank comprising a cellulose layer, which blank makes it possible to combine optimal sealing with good opening ergonomics, in particular with regard to ease of opening for young children and / or with regard to the soft portion of the packaging.

[0013] To this end, according to a first aspect, the invention proposes a blank for packaging a portion of food, said blank comprising fold lines allowing said blank to be formed into a prismatic envelope having a triangular base, in which said portion of food can be packaged before closing said envelope, said fold lines defining a blank having:

[0014] - a bottom panel having a triangular geometry, said bottom panel being intended to form the bottom wall of the envelope;

[0015] - two side panels having a quadrilateral geometry, each having an inner edge connected to a respective long outer side of the bottom panel by a folding line, said side panels being intended to form respective side walls of the envelope;

[0016] - two top panels, each having a triangular geometric shape with a large inner edge connected to the corresponding outer side of the side panels by folding lines, the top panels being intended to jointly form the top wall of the envelope;

[0017] - a rear panel having an inner edge connected to the rear edges of the bottom panel, the side panels and the top panel by fold lines, the rear panel being intended to form the rear wall of the envelope;

[0018] a border element having two outer strips, each having an inner edge connected to a corresponding large outer edge of the top panel by a fold line, the outer strips being arranged to seal against each other to form a sealing backing for the top wall of the envelope;

[0019] The border piece also has two front strips, each of which has a rear edge connected to the front edge of the outer strip and the front edge of the side panel by a fold line, the front strips having a common inner edge formed by a fold line extending in the extension of the apex of the bottom panel, the front strips are arranged to seal with each other to form a sealing pull tab at the end of the package as an extension extending from the backing, the blank includes a tear line with two side segments, each of the side segments is on the top panel and extends along the outer edge of the adjacent side panel, and each of the side segments is extended by a front segment, the front segment is continuous with the side segment and extends beyond the outer edge of the adjacent side panel on the adjacent side panel and towards the apex of the bottom panel, the tear line is arranged so that manually pulling the sealing pull tab will cause the blank to tear along its end from the apex of the bottom panel to the top panel, and then the tear propagates on both sides of the top wall.

[0020] According to a second aspect, the invention proposes a method for packaging food portions with the aid of such a blank, said method providing that:

[0021] - folding the blank along its fold lines to form a prismatic envelope with a triangular base, the prismatic envelope having a bottom wall, two side walls, a top wall and an open rear mouth;

[0022] - the outer and front strips of the sealing border to form the sealing backing of the top wall of the envelope and the sealing tabs at the ends of the package;

[0023] - Partially enclosing the food product in the package through the rear opening;

[0024] - Close the mouth tightly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Further features and advantages of the present invention will become apparent from the following description made with reference to the accompanying drawings, in which:

[0026] - Figure 1 Schematically shows a view of the front side and the inside of a blank according to the invention before it is folded;

[0027] - Figures 2a to 2f Shown Figure 1 perspective views of a blank viewed from different directions during the various steps of its folding to form a package;

[0028] - Figures 3a to 3e Shows the open Figure 2f perspective views of the various steps of the packaging shown, viewed from different directions;

[0029] - Figure 4a and Figure 4b With Figure 1A similar schematic view schematically shows a blank according to a variant of the embodiment of the preceding figures. DETAILED DESCRIPTION

[0030] In conjunction with these figures, a blank for packaging a food portion 1 and a method for packaging a food portion 1 using the blank will be described below.

[0031] The blank is particularly suitable for packaging single food portions of fresh dairy products, such as fresh cheese and / or melted cheese.

[0032] The blank is formed from a composite body 2 having a sealing layer 2a having barrier properties against oxygen and / or water vapor, so as to ensure the preservation of the packaged food portion 1 .

[0033] The sealing layer 2a can be made of a food-grade plastic material, in particular when the sealing layer is intended to be in contact with the food portion 1 packaged in the package. To this end, the sealing layer 2a can be made of polyethylene (PE) and / or polyethylene terephthalate (PET), but can also be made of other known types of food-grade plastics, such as polyamide (PA), polypropylene (PP) or polylactic acid (PLA).

[0034] Advantageously, the composite body 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 formed by a papermaking process to form a paper or cardboard layer, or they may be in the form of a nonwoven fabric.

[0035] This arrangement enables the package to benefit from an eco-design.In particular, the outer layer 2b may be made from recycled cellulose fibres.

[0036] According to an example, the mass per unit area of ​​the outer layer 2b is between 30 g / m 2 and 150g / m 2 between, especially between 50g / m 2 and 110g / m 2 between, more particularly 80 g / m 2 of magnitude.

[0037] Advantageously, the composite body 2 comprises between 60% and 90% by weight of cellulose fibers. To this end, the thickness of the outer layer 2b may be approximately 60 μm and the thickness of the inner layer 2a may be between 4 μm and 20 μm.

[0038] In order to improve the overall sealing properties of the package, the composite body 2 may comprise at least one additional layer of film and / or varnish having suitable properties, in particular barrier properties to oxygen and / or water vapor. In particular, the outer surface of the outer layer 2b may be coated with an additional layer of varnish having anti-condensation properties.

[0039] The composite body 2 may have decorations and / or markings, such as patterns and / or inscriptions of an aesthetic and / or commercial nature relating to the food portion 1. These elements may be formed by printing and / or embossing directly on the outer layer 2b of cellulose fibers.

[0040] A method of packaging a food portion 1 in a blank formed in a composite body 2 as described above will now be described.

[0041] The method provides for first forming fold lines 6a to 6k on the blank, said fold lines being arranged so as to allow said blank to be formed into a prismatic envelope 3 with a triangular base into which a food portion 1 can be placed before closing said envelope to form the package.

[0042] Advantageously, the folding lines 6a to 6k are formed by creasing the outer layer 2b of cellulose fibers, which facilitates folding of the blank while maintaining the integrity of the sealing layer 2a.

[0043] With reference to the accompanying drawings, the method provides for forming folding lines 6a to 6k on the blank so as to define on said blank:

[0044] - a bottom panel 4 having a triangular geometry and intended to form the bottom wall of the envelope 3;

[0045] - two side panels 5 having a quadrilateral geometry, each having an inner edge 5 a connected to a respective long outer side 4 b of the bottom panel 4 by a folding line 6 a and each intended to form a respective side wall 7 of the envelope 3;

[0046] two top panels 8 each having a triangular geometric shape with a large inner edge 8 a connected to the respective outer side 5 b of the side panels 5 by a folding line 6 b, the top panels being intended together to form the top wall 9 of the envelope 3 ;

[0047] a rear panel 10 having an inner edge 10a connected by a fold line 6c to the rear edge 4a of the bottom panel 4, the rear edge 5c of the side panel 5 and the rear edge 8c of the top panel 8, the rear panel being intended to form a rear wall 11 of the envelope 3; and

[0048] - a border piece having two outer strips 12, each of which has an inner edge 12a connected to a corresponding large outer edge 8b of the top panel 8 by a fold line 6d, the outer strips being arranged to be sealed together to form a sealing backing 13 of the top wall 9 of the envelope 3.

[0049] The bottom panel 4 has the geometrical shape of an isosceles triangle, the bottom edge of which forms a rear edge 4 a defined by a fold line 6 c which separates the bottom panel from the rear panel 10 .

[0050] The geometry of each top panel 8 is a right triangle, the hypotenuse of which forms a large inner edge 8a defining a fold line 6b between the top panel and the adjacent side panel 5. Likewise, for each top panel 8:

[0051] - the long side 8b forming the right angle of the triangle is defined by the outer fold line 6d relative to the adjacent outer strip 12; and

[0052] The vertical short sides 8c are defined by the rear fold line 6c of the top panel relative to the rear panel 10 .

[0053] The outer strips 12 of the border piece extend to the rear edge 14 of the blank and the border piece has a rear strip 15 extending between the rear ends of the outer strips and along the entire rear edge 14 of the blank, the rear strip being connected to the rear edge 10b of the rear panel 10 by a fold line 6e and being arranged to seal to itself to form a fold 16 for sealing the rear wall 11 of the package.

[0054] refer to Figure 2a and Figure 2b The packaging method provides for folding the blank along its folding lines 6a, 6b, 6c, 6d, 6e to form a prismatic envelope 3 with a triangular base having a bottom wall, two side walls, a top wall and an open rear mouth.

[0055] To this end, the method provides for folding in sequence:

[0056] - fold lines 6a defining the large outer sides 4b of the bottom panel 4 for erecting the side panels 5 to form the side walls 7 of the envelope 3 ( Figure 2a );

[0057] - fold lines 6b defining respective outer edges 5b of the side panels 5 for folding the top panel 8 over the bottom panel 4 to form the top wall 9 of the envelope 3;

[0058] - fold lines 6d defining the respective large outer edges 8b of the top panel 8 for erecting the outer strips 12 of the border element with their respective inner faces resting against each other ( Figure 2b ).

[0059] In particular, at the end of these folding steps, an envelope 3 is obtained having an open rear mouth 17 ( Figure 2d ), and the inner surface of the rear strip 15 of the boundary piece defines the inner periphery of the rear mouth.

[0060] The method then provides for sealing the outer strip 12 of the border so as to form the sealing backing 13 of the top wall 9 of the envelope 3 .

[0061] For this purpose, the method provides for applying a layer of adhesive to the corresponding inner face of the outer strip 12 in order to form a sealing backing 13 by means of a “flesh-to-flesh” sealing of said outer strip.

[0062] The adhesive may be a hot melt glue or a cold glue in order to ensure a permanent and waterproof seal of the backing 13 .

[0063] In particular, since the outer strip 12 extends to the rear edge 14 of the blank, the sealing of the outer strip allows obtaining a sealing backing 13 for closing the periphery of the rear mouth 17 .

[0064] Then, if Figure 2c and Figure 2d As shown, after sealing, the backing 13 is folded over the top wall 9 of the envelope 3.

[0065] The method then provides for the food portion 1 to be loaded into the package through the rear mouth 17 and then the rear panel 10 to be folded to close said rear mouth.

[0066] This method thus makes it possible to form a mould by means of the envelope 3 into which the liquid or viscous food portion 1 can be poured before closing said envelope, thus limiting production costs by eliminating the additional step of shaping said food portion before packaging it in the package.

[0067] This arrangement also makes it possible to produce the packaged food portions 1 in a more hygienic manner and with better storage conditions. Indeed, by pouring the food portions 1 directly into the individual packaging, their exposure to the ambient air is limited, thereby reducing the risk of contamination, especially by bacteria. Furthermore, if the food portions 1 are poured at a temperature above the pasteurization temperature, their storage properties are further improved.

[0068] To fold the rear panel 10, the method provides for extending the fold lines 6a, 6b, 6d defining the outer edge 4b ​​of the bottom panel 4, the outer edge 5b and the inner edge 5a of the side panels 5, and the outer edge 8b and the inner edge 8a of the top panel 8 on the rear panel so as to form a bottom segment 18, a side segment 19 and a top segment 20 on the rear panel, the folding being performed by folding the side segment 19 flat so as to fold the top segment 20 and the bottom segment 18 downwards, as shown in FIG. Figure 2e shown.

[0069] To reseal the mouth 17, the method further provides:

[0070] - folding the rear strip 15 flat by placing the top portion of the inner face of said rear strip on the bottom portion of said inner face;

[0071] - Sealing the inner face of the rear strip 15 by means of the “flesh-to-flesh” joining of the top and bottom portions of the inner face of the rear strip so as to form the sealing flange 16 of the rear wall 11 .

[0072] In particular, this embodiment enables continuous sealing of the inner face of the rear strip 15 , thus ensuring optimal leak tightness, in particular due to the absence of any excess thickness during said sealing.

[0073] To enable sealing of the rear strip 15 , the method first provides for applying a layer of adhesive on the inner face of the rear strip, in particular an adhesive similar to that applied to the outer strip 12 of the border piece to form the top sealing backing 13 .

[0074] In the embodiment shown, the method provides that the folding lines 6a, 6b, 6d of the rear panel 10 extend onto the rear strip 15 of the boundary piece so as to form a bottom segment 21, a side segment 22 and a top segment 23 on the rear strip in the rear extensions of the corresponding segments 18, 19, 20 of the rear panel.

[0075] Therefore, if Figure 2d and Figure 2e As shown, the rear strip 15 is folded flat by placing the inner face of the top segment 23 on the inner face of the bottom segment 21 and folding the inner face of each of the side segments 22 onto itself.

[0076] In particular, the different folding lines 6a, 6b, 6d extend in a straight manner, which makes the production of the blank and the folding sleeve 3 easier.

[0077] The method provides for forming a pattern 6f of folding lines on the respective side segments 19 of the rear panel 10 and the respective side segments 22 of the rear strip 15, said pattern being arranged so as to enable said segments to be folded flat.

[0078] In particular, Figure 1 、 Figure 2a 、 Figure 2b 、 Figure 2c and Figure 2d As shown, each fold line pattern forms a triangle 6f, which extends on the side fan segment 19 of the rear panel 10, the base of the triangle 6f is formed by the front edge of the side fan segment 19, and the vertex of the triangle is set on the rear edge of the side fan segment, and the vertex is extended by the fold line 6g, which extends on the side fan segment 22 of the rear strip 15 and extends to the rear edge 14 of the rear strip.

[0079] The method further provides for forming:

[0080] - on each of the top segments 20, 23: a fold line segment 6h extending from the intersection of the front and inner edges of the top segment 20 of the rear panel 10 to the rear edge 14 of the blank; and

[0081] On the bottom segments 18, 21: two fold line segments 6i extending from the intersection of the front edge 10a of the rear panel 10 and a respective one of the outer edges of the bottom segment 18 of the rear panel to the rear edge 14 of the blank.

[0082] refer to Figure 2e and Figure 2f The different fold line patterns 6f and fold line segments 6h, 6i formed on the side segments 19 of the rear panel 10 allow the side segments to be folded in order to form two side gussets 24 of a triangular geometry, which are then folded onto the corresponding side walls 7.

[0083] In particular, after sealing the rear strip 15 , the sealing fold 16 thus formed is folded over the bottom portion of the rear wall 11 of the envelope 3 , and the side gussets 24 are then each folded over the adjacent side wall 7 .

[0084] As an alternative not shown, the rear opening 17 can be sealed by folding the side segments 19 toward the inside of the package into triangular gussets 24 located on both sides of the rear wall 11 of the envelope 3 and then by folding the sealing fold 16 over the rear wall after sealing the rear strip 15.

[0085] In order to facilitate opening of the package, in particular for young children and / or in connection with the soft food portion 1, the method provides for forming the fold lines so that the boundary element further has two front strips 25, each of which has: a rear edge 25a, which is connected to the front edge 12b of the outer strip 12 and the front edge 5d of the side panel 5 by a fold line 6j; and a common inner edge 26, which is formed by a fold line 6k extending continuously with the vertex of the bottom panel 4.

[0086] Advantageously, as Figure 1 、 Figure 4a 、 Figure 4b As shown, the blank is aligned relative to the axis defined by the common inner edge 26 of the front strip 25 (at Figure 1 This allows facilitating the manufacture of the blank and the folded envelope 3.

[0087] Each of the fold lines 6b defining the inner edge 8a of the top panel 8 extends to the front edge 25b of the front strip 25, forming on either side an outer sector 27 in extension of the outer strip 12 and an inner sector 28 delimited by a common inner edge 26.

[0088] In particular:

[0089] - each of the inner sectors 28 has a rear edge 28a formed by the fold line 6j and a free front edge 28b, said edges being parallel; and

[0090] The apex of each of the top panels 8 is open at the intersection of adjacent outer 27 and inner 28 sectors.

[0091] Alternatively, as Figure 4a and Figure 4b As shown, each of the fold lines 6a, 6d defining the large outer side 4b of the bottom panel 4 and the corresponding large outer edge 8b of the top panel 8, respectively, also extends adjacent to the front edge 25b of the front strip 25a, so as to form in the inner sector 28 of said front strip:

[0092] - central triangular sub-segment 28a;

[0093] - Two side sub-segments 28b situated on either side of said central sub-segment.

[0094] about Figure 2b , the front strips 25 are arranged to be sealed to each other so as to form a pull tab 29 in extension of the backing 13 for sealing the end of the package.

[0095] To this end, the method provides for applying a layer of adhesive on the inner face of the front strip 25 of the border piece, in particular similar to the adhesive used on the backing 13 and the rear flap 16, so as to enable the pull tab 29 to be formed by the "flesh-side-to-face" sealing of said front strip.

[0096] like Figure 2c and Figure 2d As shown, after sealing the top backing 13 and the front tab 29, the method provides for:

[0097] - folding the backing 13 over the top wall 9 of the envelope 3 so that the top portion of the tab 29 formed by the sealing outer sector 27 is arranged horizontally;

[0098] - folding the bottom portion of the tab formed by sealing the inner sector 28 onto the side wall 7; and

[0099] - Folding the top portion over the side wall by partially overlapping the bottom portion of the pull-tab 29 .

[0100] The method further provides for forming a tear line 30 on the blank, said tear line having two side segments 30 b, each of said side segments being on the top panel 8 and extending along the outer edge 5 b of the adjacent side panel 5, each of said side segments being extended by a front segment 30 a, said front segment being continuous with said side segment and extending beyond said outer edge of said adjacent side panel on the adjacent side panel 5 and towards the apex of the bottom panel 4.

[0101] The tear line 30 is arranged so that manually pulling the sealing tab 29 causes the blank to tear along its end from the apex of the bottom panel 4 to the top panel 8 , with the tear then propagating on both sides of the top wall 9 .

[0102] In this way, the blank makes it possible to provide the consumer with a package with a rigid pull-tab 29, the large dimensions of which make it easier to grasp with the fingers, said pull-tab also forming a lever arm to facilitate the initiation of tearing of the package along a line 30 formed in the package for this purpose.

[0103] exist Figure 1 In FIG. 3 , the tear line 30 comprises a single front segment 30a extending from the apex of the bottom panel 4 across the side panels 5 and beyond the outer edge 5b of each of the side panels.

[0104] Alternatively, as Figure 4a and Figure 4b As shown, the tear line 30 comprises two distinct front segments 30a separated by a blank section without said tear line, said blank section extending across the vertex of the bottom panel 4. This arrangement makes it possible to avoid the presence of a tearable area at the front end of the envelope 3 after folding, in order to limit the risk of leakage of the food product 1 at said end due to premature rupture of this tearable area.

[0105] In particular:

[0106] - the front segment(s) 30a of the tear line 30 extend parallel to the rear edge 4a of the bottom panel 4;

[0107] Each side segment 30 b of the tear line 30 extends parallel to the respective outer edge 5 b of the corresponding side panel 5 .

[0108] This arrangement enables the consumer to open the package at the front end of the sleeve 3 and the top wall 9, in particular on both sides of the sealing backing 13. In this way, the consumer can open the package without having to tear the backing 13, thereby ensuring the sealing of the backing during storage of the packaged food portion 1 and facilitating access to the food portion when the package of the food portion is opened.

[0109] Advantageously, the side segments 30b of the tear line 30 delimit between them and on the top wall 9 of the sleeve 3 a tearable area having a surface area at least greater than 80%, in particular greater than 95%, of the total surface area of ​​said top wall.

[0110] To this end, each side segment 30b extends in particular over more than 90% of the length of the adjacent outer edge 5b while having an intrinsic length remaining less than 100% of the length of said outer edge in order to ensure that the end is separated from the rest of the package when the package is opened.

[0111] In this way, the tear line 30 allows a large opening to be formed in the sleeve 3, facilitating the removal of the food portion 1 from the package.

[0112] In particular, each side segment 30b of the tear line 30 extends along the outer edge 5b so as to form a strip 31 between the tear line and the outer edge, so that, after the package has been opened, each strip 31 rests on the top wall of the food portion 1 so as to hold the side wall 7 of the envelope 3 to which it is attached against said food portion. This arrangement enables the food portion 1 to be wedged laterally against the bottom wall of the envelope 3 before the consumer removes the food portion, as shown in FIG. Figure 3d shown.

[0113] The width of each of the strips 31 is less than 10%, in particular less than 5%, of the width of the adjacent side panel 5. This arrangement facilitates the removal of the food portion 1 by the consumer, who only needs to separate the side walls 7 ( Figure 3e ), so as to be able to remove the food portion from the bottom wall of the envelope 3 while maintaining the integrity of the shape of the food portion, especially in the case of soft food portions 1.

[0114] exist Figure 1 and Figure 4a In the embodiment, each lateral segment 30b of the tear line 30 extends straight to the rear edge 8c of the corresponding top panel 8 and in particular extends on the rear panel 10, preferably opening into the fold line section 6h adjacent to the top segment 20.

[0115] Thus, the consumer can partially (but not completely) tear open the rear wall 11 of the package 3 by continuing to pull the tab 29 so as to hold the food portion 1 between the untorn portion of the rear wall 11 and the side wall 7 before the consumer removes the food portion from the package.

[0116] according to Figure 4b In the variant shown, the tear line 30 has two rear segments 30c, each of which extends a corresponding side segment 30b, each rear segment 30c extending straight across the adjacent side panel 5 to an end at the junction between the inner fold lines 6i, 6f facing the corresponding rear side segment 19.

[0117] In particular, each tear side segment 30b is connected to the corresponding front segment 30a and / or rear segment 30c by a bend 30d of curved geometry, each having a certain radius of curvature arranged to ensure tearing along the segment.

[0118] Furthermore, the bottom panel 4 has no tear line so that it remains integral with the sleeve 3 after the package has been opened, thereby forming a tray on which the food portions 1 can be held until picked up by a consumer.

[0119] According to one embodiment, the tear line 30 is obtained by pre-cutting part of the thickness of the blank (in particular by ablation of the material), the cutting depth being sufficient to form a weakening line, thereby enabling the blank to be guided to tear along the weakening line. Advantageously, the line 30 can be formed by laser cutting with different parameters at the bend 30d connecting the segments 30a, 30b and / or 30c, so as to facilitate tearing along the bend.

[0120] In order to maintain the integrity of the inner layer 2a, and therefore the seal of the package, the tear line 30 is formed by at least partially ablating only the outer layer 2b.

[0121] Advantageously, the tear line 30 is formed, for example by laser or mechanical cutting, over about 4 / 5 of the total thickness of the outer layer 2b, which strikes a good balance between maintaining the seal of the package and the ease of tearing the package along said line.

[0122] In another embodiment, the tear line 30 allows guiding the tearing of the blank without pre-cutting the blank, for example by fold lines or groove lines of the blank and / or a specific orientation of the fibers of the outer layer 2b along the tear line.

Claims

1. A blank for packaging a portion of food (1), said blank comprising fold lines (6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i, 6j, 6k) allowing said blank to be formed into a prismatic envelope (3) with a triangular base, in which said portion of food can be packaged before closing said envelope, said blank being defined by said fold lines and having: - a bottom panel (4) having a triangular geometry, said bottom panel being intended to form the bottom wall of the envelope (3); - two side panels (5) having a quadrilateral geometry, each of which has an inner edge (5a) connected to a respective large outer side (4b) of the bottom panel (4) by a folding line (6a), the side panels being intended to form respective side walls (7) of the envelope (3); - two top panels (8), each having a triangular geometry with a large inner edge (8a) connected to the corresponding outer edge (5b) of the side panels (5) by a folding line (6b), the top panels being intended together to form the top wall (9) of the envelope (3); - a rear panel (10) having an inner edge (10a) connected to the rear edge (4a) of the bottom panel (4), the rear edge (5c) of the side panel (5) and the rear edge (8c) of the top panel (8) by means of a fold line (6c), the rear panel being intended to form a rear wall (11) of the envelope (3); - a border piece having two outer strips (12), each having an inner edge (12a), the inner edges of the outer strips being connected to a corresponding large outer edge (8b) of the top panel (8) by a fold line (6d), the outer strips being arranged to be sealed to each other to form a sealing backing (13) of the top wall (9) of the envelope (3); The blank is characterized in that the border piece further has two front strips (25), each of which has a rear edge (25a), the rear edges of the front strips being connected to the front edge (12b) of the outer strip (12) and the front edge (5d) of the side panel (5) by a fold line (6j), the front strips having a common inner edge (26) formed by a fold line (6k) extending in extension of the apex of the bottom panel (4), the front strips being arranged to seal to each other to form a sealing tab (29) at the end of the package in extension of the backing (13), and in that the blank comprises two Tear lines (30) of side segments (30b), each of the side segments being on the top panel (8) and extending along the outer edge (5b) of the adjacent side panel (5), each of the side segments being extended by a front segment (30a), the front segment being continuous with the side segment and extending beyond the outer edge of the adjacent side panel on the adjacent side panel (5) and towards the apex of the bottom panel (4), the tear lines being arranged so that manually pulling the sealing tab (29) causes the blank to tear along its end from the apex of the bottom panel (4) to the top panel (8), with the tear subsequently propagating on both sides of the top wall (9).

2. Blank for packaging a food portion (1) according to claim 1, characterized in that The tear line (30) comprises a single front segment (30a) extending on the side panels (5) from the apex of the bottom panel (4) to beyond the outer edge (5b) of each of the side panels.

3. Blank for packaging a food portion (1) according to claim 1 or 2, characterized in that Each side segment (30b) of the tear line (30) extends parallel to the corresponding outer edge (5b) of the side panel.

4. Blank for packaging food portions (1) according to any one of claims 1 to 3, characterized in that Each side segment (30b) of the tear line (30) extends along the outer edge (5b) of the side panel, thereby forming a band (31) between the tear line and the outer edge of the side panel.

5. Blank for packaging food portions (1) according to any one of claims 1 to 4, characterized in that Each side segment (30b) of the tear line (30) extends to the rear edge (8c) of the corresponding top panel (8).

6. Blank for packaging food portions (1) according to claim 5, characterized in that Each side segment (30b) of the tear line (30) extends on the back panel (10).

7. Blank for packaging food portions (1) according to any one of claims 1 to 6, characterized in that Each of the fold lines (6b) defining the inner edge (8a) of the top panel (8) extends to the front edge (25b) of the front strip (25), while forming an outer sector (27) and an inner sector (28) defined by a common inner edge (26) in extension of the outer strip (12) on both sides of the fold lines defining the inner edge of the top panel.

8. Blank for packaging food portions (1) according to claim 7, characterized in that Each of the inner sectors (28) has a rear edge (28a) formed by a fold line (6j) and a free front edge (28b), said rear edge and said front edge of the inner sector being parallel to each other.

9. Blank for packaging food portions (1) according to any one of claims 1 to 8, characterized in that Folding lines (6a, 6b, 6d) defining outer edges (4b, 5b, 8b) and inner edges (5a, 8a) of the bottom panel (4), the side panels (5) and the top panel (8) extend, in particular straightly, on the rear panel (10) to form a bottom segment (18), a side segment (19) and a top segment (20) on the rear panel.

10. Blank for packaging food portions (1) according to any one of claims 1 to 9, characterized in that The border piece has a rear strip (15) connected to the rear edge (10b) of the rear panel (10) by a fold line (6e), the rear strip being arranged to seal to itself to form a sealing flap (16) of the rear wall (11) of the package.

11. Blank for packaging food portions (1) according to claims 9 and 10, characterised in that The rear strip (15) has a bottom segment (21), a side segment (22) and a top segment (23) in the rear extension of the corresponding segments (18, 19, 20) of the rear panel (10), and the side segments (19, 22) of the rear panel (10) and the rear strip (15) each have a folding line pattern (6f, 6g), which is arranged so that the rear strip (15) can be flat and sealed.

12. Blank for packaging a food portion (1) according to any one of claims 9 to 11, characterized in that Each of the top segments (20, 23) has a fold line segment (6h) extending from the intersection of the front and inner edges of the top segment (20) of the rear panel (10) to the rear edge (14) of the blank.

13. Blank for packaging food portions (1) according to claim 12, characterized in that Each of the side segments (30b) of the tear line (30) leads to a corresponding fold line segment (6h).

14. Blank for packaging food portions (1) according to any one of claims 1 to 13, characterized in that The blank is formed from a composite body (2) comprising an inner sealing layer (2a) and an outer layer (2b) based on cellulose fibers.

15. Blank for packaging food portions (1) according to claim 14, characterized in that The tear line (30) is formed by at least partial abrasion of only the outer layer (2b).

16. Blank for packaging a food portion (1) according to claim 14 or 15, characterized in that The folding lines (6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i, 6j, 6k) are formed by creas- ing the outer layer (2b).

17. Method for packaging food portions (1) by means of blanks according to any one of claims 1 to 16, the method comprising: - folding the blank along its folding lines (6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i, 6j, 6k) to form a prismatic envelope (3) with a triangular base, the envelope having a bottom wall, two side walls (7), a top wall (9) and an open rear mouth (17); - an outer strip (12) and a front strip (25) of sealing borders to form a sealing backing (13) on the top wall (9) of the envelope (3) and a sealing tab (29) on the end of the package; - packaging the food portion (1) in the package via the rear mouth (17); - Close the rear mouth tightly.

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