Paperboard based container

Abstract

A laminated material for packaging of liquid product, the laminated material comprising, as layer of sequence, from an external side to an internal side, a first layer of paper (20), a first gas barrier layer (30), made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the first layer of paper (20); and a second layer of paper (50), made of a high-density paper, in direct contact with the first gas barrier layer (30); a container; a blank and a method for manufacturing the laminated packaging sheet material.

Description

[0001] PAPERBOARD BASED CONTAINER

[0002] Field of the invention

[0003] The present invention relates to a laminated packaging sheet material, a blank and a container for holding a pourable food product. The invention further relates to a method for manufacturing the laminated packaging sheet material.

[0004] Background

[0005] Within the art of paperboard-based packaging, it is known to produce a blank which is folded and assembled to produce a container. The container may then be utilised to hold a pourable food product, e.g. a liquid, e.g. dairy products, such as milk or yoghurt, or juices.

[0006] The blank is typically produced from a laminated packaging material, which typically comprises a multi -ply paperboard sheet on which is laminated one or a plurality of barrier layers for holding the food product and / or prevent migration of air and flavours through the paperboard.

[0007] A method of producing the blank from the laminated packaging material typically comprises the steps of cutting the laminated packaging material to a predefined shape, and a method of producing the container from the blank typically comprises the step of folding the blank along predefined folding lines to produce the container.

[0008] The blank may be provided with crease lines in the laminated packaging material to aid folding of the blank along the folding lines. A crease line, or crease, may be defined as an embossed or impressed depression on one side of the laminated packaging material with a corresponding raised ridge or welt, also referred to as the bead, on the other side forming a line along which the laminated packaging material is structurally weakened and along which the laminated packaging material will bend or fold when pressure is applied.

[0009] Alternatively, a paperboard-based container may be produced in a roll-fed process in which a continuous web of laminated packaging material is fed to a filling machine, folded and sealed longitudinally to form a tube. The tube is then filled with the pourable food product, sealed and cut transversally to form so called pouches. The pouches are than provided with an opening device and manipulated to obtain its final form. Said manipulation typically involves folding down and securing sections of the container to side panel section of the same.

[0010] The container may be provided with an opening arrangement allowing a consumer to open the container to access the food product. In the prior art, it is known to use plastic opening arrangements, such as arrangements comprising plastic pour spouts and lid portions. A particular advantageous opening arrangement for such containers is based on the known half-cut method. Details of the half-cut method are disclosed in EP1786618B1. The major advantage of the half-cut method is that the barrier layer is fully intact until the container is opened by an end user. Another advantage of the half-cut method during production is that the laminated material may initially be produced as a homogenous sheet without any cutouts. In similar methods for obtaining an opening having an intact barrier layer, the paperboard is provided with openings before lamination and at least the barrier layer is subsequently laminated over the paperboard including the openings.

[0011] EP0313356B1 discloses a carton blank and a laminate structure, especially for use for containers for food products. The carton blank is built up as a laminate of paperboard, and paper of the greaseproof kind, an adhesive layer, such as a polyolefin layer being used, and said basic member is on both sides provided with external layers of polyolefin. The adhesive layers may, additionally, have dye pigments added to provide impermeability to light.

[0012] However, filled containers made from such laminated material and blanks have a limited shelf life, especially because the barrier properties of the laminated material are limited.

[0013] Additionally, these products are hard to recycle.

[0014] An object of the present invention is to provide laminated material having improved barrier properties and a better recyclability.

[0015] SUMMARY OF THE INVENTION

[0016] The present invention is defined by the appended claims and in the following:

[0017] In a first aspect, the invention relates to a laminated material for packaging of liquid product, the laminated material comprising, as layer of sequence, from an external side to an internal side: a first layer of paper, a first gas barrier layer, made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the first layer of paper; and a second layer of paper, in direct contact with the first gas barrier layer.

[0018] Here, it should be understood that when a layer is “in direct contact with” another layer, it means that there is no additional layer between the two layers. In other words, the layers are directly adjacent to each other.

[0019] In an embodiment, the first layer of paper may be made of paperboard.

[0020] Typically, the paperboard layer may be a duplex paperboard layer, microfibrillated cellulose, Solid Bleached Sulfate (SBS) or Coated Unbleached Kraft (CUK).

[0021] To improve the surface properties of the paperboard layer, the paperboard layer may be calendered.

[0022] In a preferred embodiment, the paperboard layer may have a eucalyptus fibre layer on one or both surfaces of the paperboard layer.

[0023] In an embodiment, the term “mainly comprising” may be understood as comprising over 50%, over 60%, over 70%, over 80% or over 90%.

[0024] In an embodiment, the first gas barrier layer may be made from a composition mainly comprising thermoplastic polyvinyl alcohol.

[0025] In an embodiment, the first gas barrier layer may be applied by dispersion coating.

[0026] In an embodiment, the first gas barrier layer may comprise a water-soluble material.

[0027] In an embodiment the first gas barrier layer may be applied at a total amount of between 1 g / m2 and 20 g / m2, dry weight, preferably between 2 g / m2 and 18 g / m2, dry weight, more preferably between 3 g / m2 and 12 g / m2, dry weight or between 5 g / m2 and 15 g / m2, dry weight.

[0028] In an embodiment, the second layer of paper may be made of a high-density paper or metalized paper. Metalized paper refers here to a paper where a layer of metal or metal oxide is deposited, preferably by physical vapor deposition (PVD). Examples of metal and metal oxide may be Al, Al Ox, diamond like carbon, Si, SiOx... In an embodiment, the second layer of paper may have a density of between 800 kg / m3and 1500 kg / m3. In an embodiment, the second layer of paper may have a density of between 800 kg / m3and 1300 kg / m3. In an embodiment, the second layer of paper may have a density of between 850 kg / m3and 1200 kg / m3.

[0029] In an embodiment, the second layer of paper may be a greaseproof paper, such as a greaseproof paper Nordic Paper Super Perga WS Plus, UPM Biofore - Beyond fossils Asendo™ or UPM Biofore - Beyond fossils Solide™ Luscent.

[0030] In an embodiment, the second layer of paper may have a grammage of between 20 g / m2 and 80 g / m2, between 30 g / m2 and 60 g / m2 or between 30 g / m2 and 50 g / m2.

[0031] In an embodiment, the laminated material may comprise on an internal side of the second layer of paper: a second gas barrier layer made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the second layer of paper.

[0032] In an embodiment, the term mainly comprising may be understood as comprising over 50%, over 60%, over 70%, over 80% or over 90%.

[0033] In an embodiment, the second gas barrier layer may be applied by dispersion coating.

[0034] In an embodiment, the second gas barrier layer may comprise a water-soluble material.

[0035] In an embodiment, the second gas barrier layer may be made from a composition mainly comprising thermoplastic polyvinyl alcohol.

[0036] In an embodiment the second gas barrier layer may be applied at a total amount of between 1 g / m2 and 10 g / m2, dry weight; preferably between 3 g / m2 and 6 g / m2, dry weight.

[0037] In an embodiment, the laminated material may comprise on an external side of the first layer of paper: a third gas barrier layer made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the first layer of paper.

[0038] In an embodiment, the term “mainly comprising” may be understood as comprising over 50%, over 60%, over 70%, over 80% or over 90%.

[0039] In an embodiment, the third gas barrier layer may be made from a composition mainly comprising thermoplastic polyvinyl alcohol.

[0040] In an embodiment, the third gas barrier layer may be applied by dispersion coating.

[0041] In an embodiment, the third gas barrier layer may comprise a water-soluble material. In an embodiment, the third gas barrier layer may be applied at a total amount of between 1 g / m2 and 10 g / m2, dry weight; preferably between 3 g / m2 and 6 g / m2, dry weight.

[0042] In an embodiment, the laminated material may comprise on an internal side of the second layer of paper or on an internal side of the second gas barrier layer, when present, a first tie layer; and a first heat sealable polyolefin layer, on an internal side of the tie layer.

[0043] In an embodiment, the laminated material may comprise on an external side of the first layer of paper or on an external side of the third gas barrier layer, when present, a second tie layer; and a second heat sealable polyolefin layer, on an external side of the second tie layer.

[0044] In an embodiment, the first and / or second heat sealable polyolefin layer may comprise LDPE, LLDPE, mLLDPE, MDPE, HDPE, PP or any blend thereof.

[0045] Suitable examples of HDPE are CG8410 from Borealis (0.941 g / cm3), CG8410 from Borealis (0.962 g / cm3), Dowlex 2006G from Dow (0.961 g / cm3), Trucoat MC2004 from Westlake (0.946 g / cm3), Rigidex HD6070FA (0.960 g / cm3).

[0046] Suitable examples of LDPE are CA 8200 from Borealis (0.920 g / cm3), LDPE PT 7007 from Dow (0.918 g / cm3), LDPE LD 258 from ExxonMobil (0.919 g / cm3), 19N430 from INEOS (0.920 g / cm3).

[0047] The tie layer may also be referred to as a bonding layer or an adhesive layer.

[0048] In an embodiment, the first and / or the second tie layer comprises an adhesive polymer.

[0049] Suitable examples of adhesive polymer are AdmerNF837E from Mitsui, Admer AT3078E from Mitsui, Yparex 9408 from Yparex and Yparex 9207 from Yparex.

[0050] In an embodiment, the laminated material may consist of, as layer of sequence, from an external side to an internal side: a second heat sealable polyolefin layer; a first layer of paper, in direct contact with the second heat sealable polyolefin layer; a first gas barrier layer, made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the first layer of paper; and a second layer of paper, in direct contact with the first gas barrier layer; a first heat sealable polyolefin layer, in direct contact with the second layer of paper.

[0051] In an embodiment, the laminated material may consist of, as layer of sequence, from an external side to an internal side: a second heat sealable polyolefin layer; a first layer of paper, in direct contact with the second heat sealable polyolefin layer; a first gas barrier layer, made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the first layer of paper; and a second layer of paper, in direct contact with the first gas barrier layer; a second gas barrier layer made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the second layer of paper; a first tie layer, in direct contact with the second gas barrier layer; and a first heat sealable polyolefin layer, in direct contact with the first tie layer.

[0052] In an embodiment, the laminated material may consist of, as layer of sequence, from an external side to an internal side: a second heat sealable polyolefin layer; a second tie layer, in direct contact with the second heat sealable polyolefin layer; a third gas barrier layer made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the second tie layer a first layer of paper, in direct contact with the third gas barrier layer; a first gas barrier layer, made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the first layer of paper; and a second layer of paper, in direct contact with the first gas barrier layer; a first heat sealable polyolefin layer, in direct contact with the second layer of paper.

[0053] In an embodiment, the laminated material may consist of, as layer of sequence, from an external side to an internal side: a second heat sealable polyolefin layer; a second tie layer, in direct contact with the second heat sealable polyolefin layer; a third gas barrier layer made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the second tie layer a first layer of paper, in direct contact with the third gas barrier layer; a first gas barrier layer, made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the first layer of paper; and a second layer of paper, in direct contact with the first gas barrier layer; a second gas barrier layer made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the second layer of paper; a first tie layer, in direct contact with the second gas barrier layer; and a first heat sealable polyolefin layer, in direct contact with the first tie layer.

[0054] In a second aspect, the invention relates to a container for holding a pourable product, the container comprising a laminated material according to the first aspect of the invention which is folded to form said container, wherein the laminated material is oriented so that the second layer of paper is closer to the internal side of the container relative to the first layer of paper. In other words, the internal side of the laminated material is on the internal side of the container.

[0055] In an embodiment, the container may comprise an opening arrangement, the opening arrangement configured such that a section of the laminated material defined by the cut is pushed or pulled during the first opening of the container, such that the laminated material is ruptured along the cut.

[0056] In an embodiment, the cut may extend into the laminated material substantially orthogonal to the outside surface of the laminated material. In a third aspect, the invention relates to a blank for making the container according to the second aspect of the invention.

[0057] In a fourth aspect, the invention relates to a method for manufacturing the laminated packaging sheet material, comprising the steps of a) providing a first layer of paper; b) applying a first gas barrier layer made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the first layer of paper, by dispersion, solution coating; and d) applying a second layer of paper, made of a high-density paper, in direct contact with the first gas barrier layer.

[0058] Dispersion and solution coating are advantageous compared to other known application methods, such as (blown) films application and extrusion coating, because dispersion and solution coating use a lower temperature that do not damage the material or reduce their barrier properties.

[0059] Size presses on paper machines are normally used to apply a solution of a polymer to the surface, historically for starch additives. Modern sizing technologies include film press (Sym-sizer), spray sizing and curtain sizing. By incorporating other additives, the sizing process may improve a range of paper product requirements, including strength, hydrophobicity, reduction of air permeability, as well as barrier properties using PVOH dispersions. The PVOH solution could alternatively, as a separate step, be applied using known dispersion coating technologies as spraying or blade coating.

[0060] Short description of the drawings

[0061] In the following description this invention will be further explained by way of exemplary embodiments shown in the drawings:

[0062] Fig. 1 is a cross-sectional view of a known laminated material

[0063] Fig. 2a is a cross-sectional view of a first alternative of a first embodiment of the laminated material according to the present invention.

[0064] Fig. 2b is a cross-sectional view of a second alternative of a first embodiment of the laminated material according to the present invention.

[0065] Fig. 3 is a cross-sectional view of a second embodiment of the laminated material according to the present invention.

[0066] Fig. 4 is a cross-sectional view of a third embodiment of the laminated material according to the present invention.

[0067] Fig. 5 is a cross-sectional view of a fourth embodiment of the laminated material according to the present invention.

[0068] Fig. 6 is a fragmentary top plan view of a top closure obturating panel of a liquid packaging container of gable-top, slant-top or flat-top character, prior to application of a pour spout fitment thereto.

[0069] Fig. 7 is an underneath, fragmentary perspective view of the panel after opening of the container, pusher blades of a plunger of a pour spout fitment being also seen.

[0070] Fig. 8 is a perspective view from above of a gable-top container with the pour spout fitment applied thereto.

[0071] It should be understood that the drawings are not intended to limit the invention to the subject-matter depicted in the drawings.

[0072] In the drawings, like reference numerals have been used to indicate common parts, elements or features unless otherwise explicitly stated or implicitly understood by the context. Detailed description

[0073] In the following embodiments of containers will be described in more detail with reference to the drawings. However, it is specifically intended that the invention as defined in the claims is not limited to the embodiments and illustrations contained herein but includes modified forms of the embodiments including portions of the embodiments and combinations of elements of different embodiments as come within the scope of the claims.

[0074] FIG. 1 shows a schematic cross-sectional view of a known laminated structure comprising as layer of sequence, from an external side to an internal side, a first layer of polyethylene 10, a paperboard layer 20, a second layer of polyethylene 40, a layer of high density paper 50 and a third layer of polyethylene 80.

[0075] This laminated material is used for packaging of liquid food or beverage, however, the barrier properties of this structure are limited, which results in degradation of the product contained in the container, for example via chemical degradation due to O2 exchanges and / or water evaporation over time.

[0076] In addition, this laminated material is difficult to recycle, because the polyolefin layers, made here of a polyethylene, especially the one between the paperboard and the HD paper, bleed into the paperboard and HD paper, creating a very strong bond, and the paperboard and HD paper are therefore very difficult to properly separate so that the different layers of the laminated structure may be recycled properly.

[0077] The current invention also improves the separation of the polyolefin-based layer and of the paper layers by adding at least an easy separation layer in the laminated structure.

[0078] The current invention improves the shelf life of the products contained in the container by providing an innovative laminated material for packaging having at least equal or improved barrier properties.

[0079] In addition, the total amount of polymer in the laminated structure is reduced.

[0080] The innovative laminated material for packaging of liquid food or beverage, the laminated material comprises, as layer of sequence, from an external side to an internal side: a first layer of paper 20, a first gas barrier layer 30, made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the first layer of paper 20 and a second layer of paper 50, in direct contact with the first gas barrier layer 30.

[0081] It is now referred to FIG. 2a, which shows a schematic cross-sectional view of a first alternative to a first embodiment of the invention comprising as layer of sequence, from an external side to an internal side, a first layer of polyethylene 10, a paperboard layer 20, a first gas barrier layer made of PVOH 30, a layer of high density paper 50 and a second layer of polyethylene 80.

[0082] The first gas barrier layer made of PVOH 30 helps improve the barrier properties of the laminated structure.

[0083] In addition, the barrier layer made of PVOH 30 plays the role of an adhesive layer between the paperboard layer 20 and the HD paper layer 50; removing the need for another adhesive layer, for example a polyolefin layer made of polyethylene.

[0084] Finally, the layer of PVOH 30 is water soluble. When the laminated structure has been used to produce a container and the container is ready to be recycled, the paperboard layer 20 and the HD paper layer 50 will be more easily separated, by dissolving the barrier layer made of PVOH 30 in water and delaminating the laminated structure. This delamination step is much easier to achieve without an adhesive layer, for example a polyolefin layer made of polyethylene.

[0085] It is now referred to FIG. 2b, which shows a schematic cross-sectional view of a second alternative to the first embodiment of the invention. The second alternative is identical to the first alternative to the first embodiment of the invention, except that the HD paper layer 50 is replaced by a layer of metalized paper, for example a substrate paper cover with a layer of aluminum oxide (AlOx) deposited by physical vapor deposition (PVD). The laminated laminated structure present the same advantages as first alternative to the first embodiment of the invention but has other practical applications.

[0086] It is now referred to FIG. 3, which shows a schematic cross-sectional view of a second embodiment of the invention comprising as layer of sequence, from an external side to an internal side, a first layer of polyethylene 10, a paperboard layer 20, a first gas barrier layer made of PVOH 30, a layer of high density paper 50, a second gas barrier layer made of PVOH 70, a Tie layer 75 and a second layer of polyethylene 80.

[0087] The second embodiment of the invention presents the same advantages as the first embodiment of FIG. 2a and 2b. In addition, the second gas barrier layer made of PVOH 70 also adds to the gas barrier properties of the laminated structure.

[0088] When the laminated structure has been used to produce a container and the container is ready to be recycled, the second paper layer 50 and the heat sealable polyolefin layer 80 will be more easily separated, by dissolving the barrier layer made of PVOH 70 in water and delaminating the laminated structure. This delamination step is much easier to achieve than when the polyolefin layer 80 is in direct contact with the HD paper layer 50, as in this case, the polyolefin layer 80 bleeds into the HD paper layer 50. During separation of the layers, paper fibers are tom together with the polyolefin layer 80. The barrier layer made of PVOH 30 acts as a release layer, easily separating the polyolefin layer 10 and the HD paper layer 50 by being dissolved. It is now referred to FIG. 4, which shows a schematic cross-sectional view of a third embodiment of the invention comprising as layer of sequence, from an external side to an internal side, a first layer of polyethylene 10, a Tie layer 12, a third gas barrier layer made of PVOH 15, a paperboard layer 20, a first gas barrier layer made of PVOH 30, a layer of high density paper 50, and a second layer of polyethylene 80.

[0089] The third embodiment of the invention presents the same advantages as the first embodiment of FIG. 2a and 2b. In addition, the third gas barrier layer made of PVOH 15 also adds to the gas barrier properties of the laminated structure.

[0090] When the laminated structure has been used to produce a container and the container is ready to be recycled, the polyolefin layer 10 and the first paper layer 20 will be more easily separated, by dissolving the barrier layer made of PVOH 15 in water and delaminating the laminated structure. This delamination step is much easier to achieve than when the polyolefin layer 10 is in direct contact with the paperboard layer 20, as in this case, the polyolefin layer 10 bleeds into the paperboard layer 20 and, during separation of the layers, paper fibers are tom together with the polyolefin layer 10. The barrier layer made of PVOH 15 acts as a release layer, easily separating the polyolefin layer 10 and the paperboard layer 20 by being dissolved.

[0091] It is now referred to FIG. 5, which shows a schematic cross-sectional view of a fourth embodiment of the invention comprising as layer of sequence, from an external side to an internal side, a first layer of polyethylene 10, a Tie layer 12, a third gas barrier layer made of PVOH 15 a paperboard layer 20, a first gas barrier layer made of PVOH 30, a layer of high density paper 50, a second gas barrier layer made of PVOH 70, a Tie layer 75 and a second layer of polyethylene 80.

[0092] The third embodiment of the invention combines the advantages of the first, the second and the third embodiment of FIG. 2-4 respectively.

[0093] In addition, the combination of the first, with the second and / or third gas barrier layers made of PVOH 30, 70, 15 also presents a further advantage, namely that the total amount of gas barrier may be reduced compared to if they were used alone. In other words if the first gas barrier layer 30 is used alone, said layer may be applied at a total amount of 5-15 g / m2, dry weight, preferably 10-15 g / m2, dry weight; while when used in combination with a second or third gas barrier layer 70, 15 the total amount may be reduced to 3-12 g / m2, dry weight, while the applied amount of the second or third gas barrier layer 70, 15 may be 3-6 g / m2, dry weight.

[0094] The laminated material of FIG. 2-5, may be used to make packaging, using the half-cut method to form an opening arrangement. A typical opening arrangement is illustrated in FIG. 6-8. Referring to the drawings, the top closure obturating panel 2 of the container 1 is formed with the half-cut method, i.e. formed with a partial depth cut 4 through the outermost moisture barrier layer 10 and at least part of the first layer of paper 20, but not penetrating the first gas barrier layer 30, of the laminated packaging material, progressing from the exterior of the container to the interior thereof. The partial depth cut has been formed in the laminated material before filling of the container 1, for example during cutting of the container blank from a web of the laminated material. The knife used for forming the partial depth cut 4 is of a corresponding shape and size to that cut 4. As can be seen from Figure 1, the partial depth cut 4 is in the form of an open loop of which one end 4a is at a greater distance from a central zone of the loop 4 than is the other end 4b thereof. The open loop 4 may be such that, progressing from the end 4b thereof, the loop is of a constant radius through about 270°, where that part-circle then merges into a part-circle of a larger radius for about 110° to the end 4a, so that the ends 4a and 4b overlap each other.

[0095] Following filling and top-sealing of the container 1, there is then applied to the top surface of the panel 2a pour spout fitment 3 consisting of a flanged pour spout 5, a screw cap 7 on the pour spout, and a plunger cooperating with the screw cap 7 and the pour spout 5 in such manner that, upon unscrewing of the screw cap 7 from the pour spout 5, the plunger is simultaneously displaced axially inwards and rotates about its own axis relative to the container 2. At its inner end, the plunger is formed with arcuate pushing blades 6, which thereby turn about the axis of the fitment 3 while advancing axially inwards and so cause the laminated material of the panel 2 to fracture along the partial depth cut 4 such that an encircling portion 2a of the panel 2 and an encircled portion 2b of the panel 2 within the loop 4 separate from each other along the loop 4, but remain interconnected by way of an intermediate portion 2c of the panel 2 extending through between the ends 4a and 4b of the loop.

[0096] To obtain a recyclable packaging laminate, attempts have been made to replace the Al-foil of well-known packaging laminate, by more environmentally friendly barrier layer. However, these new laminated materials were shown not to be suitable for use with all types of opening arrangement, especially with the half-cut method. With this method, the opening arrangement does not open as it should, for example by not opening fully, which does not allow the user to pour liquids as intended, by ripping the packaging in un unintended way that may result in compromising the sealing properties of the packaging, or even leakage...

[0097] The inventive laminated structure is suitable for use combined with the half-cut method, yielding a half-cut opening arrangement and will be suitable for use in containers for holding pourable food product.

[0098] The inventive laminated structure is suitable for use with other types of opening arrangements such as gable top opening and general opening devices such as closures.

Claims

CLAIMS1. A laminated material for packaging of a liquid product, the laminated material comprising, as layer of sequence, from an external side to an internal side: a first layer of paper (20), a first gas barrier layer (30), made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the first layer of paper (20); and a second layer of paper (50), in direct contact with the first gas barrier layer (30); wherein the second layer of paper (50) is made of a high-density paper or metalized paper; and characterized in that the laminated material comprises on an internal side of the second layer of paper (50): a second gas barrier layer (70) made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the second layer of paper (50).

2. A laminated material according to claim 1, wherein the first gas barrier layer (30) is made from a composition mainly comprising thermoplastic polyvinyl alcohol.

3. A laminated material according to any of the previous claims, wherein the first gas barrier layer (30) comprises a water-soluble material.

4. A laminated material according to any of the previous claims, wherein the first gas barrier layer (30) is applied at a total amount of between 1 g / m2 and 20 g / m2, dry weight, preferably between 2 g / m2 and 18 g / m2, dry weight, more preferably between 3 g / m2 and 12 g / m2, dry weight or between 5 g / m2 and 15 g / m2, dry weight.

5. A laminated material according to any of the previous claims, wherein the second gas barrier layer (70) is applied at a total amount of between 1 g / m2 and 10 g / m2, dry weight; preferably between 3 g / m2 and 6 g / m2, dry weight.

6. A laminated material according to any of the previous claims, wherein the laminated material comprises on an external side of the first layer of papera third gas barrier layer (15) made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the first layer of paper (20).

7. A laminated material according to claim 6, wherein the third gas barrier layer (15) is applied at a total amount of between 1 g / m2 and 10 g / m2, dry weight; preferably between 3 g / m2 and 6 g / m2, dry weight.

8. A laminated material according to any of the previous claims, wherein the laminated material comprises on an internal side of the second gas barrier layer (70), a first tie layer (75); and a first heat sealable polyolefin layer (80), on an internal side of the first tie layer (75).

9. A laminated material according to any of the previous claims, wherein the laminated material comprises on an external side of the first layer of paper (20) or on an external side of the third gas barrier layer (15), when present, a second tie layer (12); and a second heat sealable polyolefin layer (10), on an external side of the second tie layer (12).

10. A container (1) for holding a pourable food product, the container (1) comprising a laminated material according to any one of claims 1 to 9 which is folded to form said container (1), wherein the laminated material is oriented so that the second layer of paper (50) is closer to the internal side of the container (1) relative to the first layer of paper (20).

11. The container (1) according to claim 10, comprising an opening arrangement, the opening arrangement configured such that a section of the laminated material defined by the cut is pushed or pulled during the first opening of the container, such that the laminated material is ruptured along the cut.

12. A blank for making the container according to any one of claims 10 or 11.

13. Method for manufacturing a laminated packaging sheet material, comprising the steps of a) providing a first layer of paper (20),b) applying a first gas barrier layer (30) made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the first layer of paper (20), by dispersion, solution coating, c) applying a second layer of paper (50), in direct contact with the first gas barrier layer (30); wherein the second layer of paper (50) is made of a high-density paper or metalized paper; and d) applying a second gas barrier layer (70) made from a composition mainly comprising polyvinyl alcohol (PVOH), in direct contact with the second layer of paper (50).

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