Hermetically sealed packages containing parchment paper and polysaccharide-based coatings

Abstract

The present invention relates to a hermetically sealed package for food products, comprising: i) a first parchment paper that seals and forms a volume for storing food products; and ii) a polysaccharide-based composition coated on either ii.a) one side of the first parchment paper or ii.b) a bio-based binder coating coated directly on one side of the first parchment paper, wherein the polysaccharide-based composition is coated on the side of the package facing away from the formed volume. The present invention also relates to methods for forming the hermetically sealed package and methods for using the same.

Description

[Technical field]

[0001] The present invention relates to a hermetically sealed package, a method for making the package, and a method for using the package. [Background technology]

[0002] Paper-based packages are well known in the art. Such packages traditionally include multiple laminated layers of paper, paperboard, barrier, aluminum foil, plastic film, etc. Such packages can be used for many applications, including food storage. However, such packages are difficult to recycle the layers in a sustainable manner. Thus, the packages are often disposed of as waste that is not fully recycled. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention intends to provide a recyclable package that does not compromise its quality and functionality. The present invention therefore aims to provide a high performance package with long storage and low permeability of, for example, fatty and / or aqueous compositions. A further object is to provide a recyclable package that can be produced only from fossil-free products and materials. A further object is to provide a package that substantially ensures that no harmful or toxic substances are transferred to the solid or liquid food contained in the package. A further object is to provide a package that allows for the transportation of the package, which is arranged in a space-efficient manner when shipped from the supplier to the end user or distributor, etc., in order to optimize efficient transportation in the smallest possible container. In particular, one object of the present invention is to provide a package that optimizes the storage volume by minimizing the size of the package itself, for example by omitting relatively thick overlapping edges that unfold and tear when the package is opened. A further object of the present invention is to provide a good oxygen barrier for the package, especially for dry and / or fatty foods. A further object of the present invention is to extend the life of the package and to protect any bio-based binders that may be contained in the package. [Means for solving the problem]

[0004] The present invention The present invention relates to i) a first parchment paper that encloses and forms a volume for storing food; ii) ii.a) on one side of said first parchment paper; or ii.b) a bio-based binder coating coated directly onto one side of the first parchment paper; Polysaccharide-based composition coated on wherein the polysaccharide-based composition is coated on a side of the package facing away from a formed volume.

[0005] For reasons of clarity, the closed package defined above may hereinafter also be referred to as the inner package. According to one embodiment, the polysaccharide-based composition includes a bio-based binder. The polysaccharide-based composition may include a bio-based binder when coated directly onto the first parchment paper and / or when coated onto a bio-based binder coating.

[0006] According to one embodiment, the polysaccharide-based composition comprises a polysaccharide or a mixture of polysaccharides alone. Preferably, the polysaccharide is coated alone directly on the first parchment paper without any additional ingredients.

[0007] According to one embodiment, once the polysaccharide-based coating has been coated and adhered to the first parchment paper, a bio-based binder can be coated over the polysaccharide-based composition coating, which protects the polysaccharide-based composition from dissolution that may result from the influence and / or migration of aqueous or water-containing components outside of the bio-based binder.

[0008] According to one embodiment, when the first parchment paper comes into direct contact with a formed volume that may contain a food product, the first parchment paper is not coated on the side facing the sealed volume. This of course entails that when the side facing the sealed volume comes into direct contact with the food product, no or minimal material of the coating may migrate and / or dissolve into the food product stored within the package.

[0009] According to one embodiment, the first parchment paper is pre-impregnated with a sizing agent, for example selected from resins and / or rosins, which preferably reduces the permeability through the parchment paper, resulting in minimization of migration of compounds from the parchment paper.

[0010] According to one embodiment, the thickness of said first parchment paper, and preferably any further parchment paper, such as the second parchment paper, is in the range of 20 to 100, preferably 35 to 80, for example 40 to 70 μm. Preferably, the basis weight (surface weight) of any uncoated parchment paper, such as said first or second or further parchment paper, is in the range of 20 to 100, more preferably 35 to 80, for example 40 to 70 g / m 2 Preferably, the grease resistance of the parchment paper is in the range of 1200 to 2000, such as 1500 to 1900 seconds, according to test method Tappi 454. Suitable parchment papers may be selected from, for example, Super Perga WS Opaque Parchment, Candor FA / FL, or Foodwrap Paper available from Nordic Paper.

[0011] According to one embodiment, the polysaccharide-based composition is coated onto a bio-based binder coating that has been pre-coated onto the side of the first parchment paper facing away from the enclosed volume.

[0012] According to one embodiment, a second parchment paper coated with a bio-based binder is laminated to the first parchment paper on the side of the package closest to the formed volume, with the bio-based binder coating disposed between the first and second parchment papers, such that the second parchment paper can be closest to the enclosed volume according to this embodiment.

[0013] According to one embodiment, the bio-based binder is coated on the first parchment paper on the side facing the sealed volume and on the second parchment paper side facing away from the sealed volume, the second parchment paper being located closest to the sealed volume. The package according to this embodiment thus comprises, in the stated order, the second parchment paper closest to the sealed volume, the bio-based binder coating and the first parchment paper. Preferably, the first parchment paper and the second parchment paper are laminated together with the bio-based binder coating in between. Preferably, the second parchment paper is not coated on the side facing the sealed volume, i.e. the volume for storing food, with which the coating facing the enclosed volume comes into contact. Thus, in this embodiment, the bio-based binder is located between the first parchment paper and the second parchment paper, and can act as a water barrier for both the first parchment paper and the polysaccharide-based composition coated on the side of the first parchment paper facing away from the sealed volume. Thus, the coating of the polysaccharide-based composition may be further protected by the second parchment paper, thereby further maintaining its functionality, for example as an oxygen barrier.

[0014] According to one embodiment, a second parchment paper is coated with a polysaccharide-based composition and a bio-based binder is coated onto the polysaccharide-based composition coating, and the second parchment paper closest to the formed volume is laminated to the first parchment paper, with the polysaccharide-based composition coating and the bio-based binder coating disposed between the first and second parchment papers.

[0015] According to one embodiment, the first parchment paper and any further parchment paper are free of silicone-based compounds and / or fluorine-based compounds. According to one embodiment, the polysaccharide-based composition comprises hemicellulose, microfibril cellulose, nanofibril cellulose, or a mixture thereof, preferably hemicellulose.

[0016] According to one embodiment, the polysaccharide-based composition comprises microfibrillar and / or nanofibrillar polysaccharides, preferably microfibrillar and / or nanofibrillar cellulose.

[0017] According to one embodiment, the polysaccharide-based composition comprises hemicelluloses, such as pentosan-rich polysaccharides, which may include, among others, xylans, glucomannans, galactoglucomannans, arabinogalactans, or mixtures thereof, which may be present in an amount of about 20 wt% up to 75 wt% or 80 wt% or 100 wt%. According to one embodiment, the polysaccharide-based composition comprises pentosan and / or xylose-containing polysaccharides in an amount of about 20 wt% up to about 75 wt% or 80 wt% or 100 wt%. According to one embodiment, the polysaccharide-based composition comprising at least one polysaccharide, in particular hemicellulose, has a molecular weight of 8000 to 50000 g / mol, for example 8000 to 48000 g / mol or 8000 to 45000 g / mol, for example 15000 to 45000 g / mol or 20000 to 40000 g / mol. The use of a somewhat higher molecular weight may improve the coating ability and adhesion of the polysaccharide-based composition, which may in particular comprise hemicellulose. If even higher molecular weights are used, the high viscosity may complicate the use of hemicellulose for producing coatings. The molecular weight of the polysaccharide-based composition comprising at least one polysaccharide, such as hemicellulose, may also be in the range of 8000 to 15000 g / mol, for example 8000 to 14000 g / mol. The use of a lower molecular weight may be advantageous since hemicellulose can be used from many sources, simplifying the extraction procedure therefrom.

[0018] According to one embodiment, the polysaccharide-based composition comprises microfibrillar and / or nanofibrillar polysaccharides, preferably microfibrillar and / or nanofibrillar cellulose. Sources of cellulose for the preparation of microfibrillar and / or nanofibrillar cellulose include: (a) wood fibers, e.g. from chemical pulp, mechanical pulp, thermomechanical pulp, chemi-thermo-mechanical pulp, recycled fibers, e.g. from hardwoods and softwoods; (b) seed fibers, e.g. cotton; (c) seed husk fibers, e.g. soybean hulls, bean hulls, corn husks; (d) bast fibers, e.g. from flax, hemp, jute, ramie, kenaf; (e) leaf fibers, e.g. from abaca, sisal; (f) stalk or straw fibers, e.g. from bagasse, corn, wheat; (g) grass fibers, e.g. from bamboo; (h) cellulose fibers from algae, e.g. velonia; (i) bacteria or fungi and (j) parenchyma cells, e.g. from vegetables and fruits, especially sugar beet, and citrus fruits, e.g. lemon, lime, orange, grapefruit. Microcrystalline forms of these cellulose materials may also be used. Cellulose sources include (1) refined and optionally bleached wood pulp produced from sulfite, kraft (sulfuric acid), or prehydrolyzed kraft pulping processes, and (2) refined cotton linters. The source of cellulose is not limited, and any source may be used, including synthetic cellulose or cellulose analogs. According to one embodiment, microfibrillar and / or nanofibrillar polysaccharides, such as microfibrillar and / or nanofibrillar cellulose, are derived from hardwoods and / or softwoods.

[0019] According to one embodiment, the microfibrillar or nanofibrillar polysaccharides have an arithmetic fiber length of about 0.05 to about 0.5, such as about 0.1 to about 0.4, or about 0.15 to about 0.3 mm.

[0020] According to one embodiment, the surface area of ​​the polysaccharide, such as microfibril or nanofibril cellulose, is between 1 and 100 g / m 2 , preferably 10 to 80 g / m 2 is within the range.

[0021] According to one embodiment, the microfibrils or nanofibrils of a polysaccharide, such as microfibril or nanofibril cellulose, range in diameter from about 5 to 100 nm, preferably from about 25 to about 35 nm.

[0022] Preferably, the thickness of the polysaccharide, e.g. microfibril and / or nanofibril cellulose, is in the range of 1-100 nm, preferably 25-100 nm. According to one embodiment, the microfibril and / or nanofibril polysaccharide, e.g. microfibril and / or nanofibril cellulose, is modified, e.g. by grafting, crosslinking, chemical oxidation, e.g. by using hydrogen peroxide. The polysaccharide may have further properties as disclosed in WO 2009 / 153225.

[0023] According to one embodiment, the bio-based binder may be derived from an aqueous emulsion comprising a biopolymer, e.g. a modified biopolymer, and preferably a natural plant compound. Preferably, the bio-based binder is hydrophobic. Preferably, the bio-based binder is cationic. Preferably, the bio-based binder coating comprises latex and / or wax and / or a polyester-based derivative, e.g. a polylactic acid modified polyester. Preferably, the bio-based coating comprises at least 20 wt%, e.g. at least 40 wt%, or at least 60 wt% latex, wax, a polyester-based derivative, e.g. a polylactic acid modified polyester, and / or a mixture thereof. The term latex and wax also includes solidified coatings derived from dispersions and emulsions of latex and wax.

[0024] According to one embodiment, the bio-based binder coating may be prepared from a polymer dispersion or emulsion, preferably containing at least one latex and / or wax and / or polyester derivative. Thus, after applying the latex and / or wax or polyester derivative dispersion and / or emulsion on the first parchment paper, or optionally on any other coating and / or parchment paper, and drying, a coating may be obtained. The polymer dispersion is preferably of renewable material or is composed of at least 30 wt% renewable material. Suitable latex species may be derived for example from styrene-butadiene rubber (SBR) latex polymer dispersions, which may have a particle size in the range of 0.1-0.3 μm. According to one embodiment, the waxes used according to the invention include lipids, preferably selected from esters of long-chain alcohols containing about 12 to 32 carbon atoms and fatty acids. Such waxes can be found in nature as coatings on the leaves and stems of plants, preventing them from losing excessive amounts of water. According to one embodiment, the bio-based binder coating comprises latex, wax, polylactic acid modified polyester, or derivatives and / or mixtures thereof, preferably polylactic acid modified polyester. Naturally, any dispersion or emulsion of any bio-based binder is pre-dried before the coating is formed.

[0025] Suitably, the molecular weight of the bio-based binder is in the range of 50-1500, such as 100-900, such as 150-700, or most preferably 220-600 g / mole. According to one embodiment, the viscosity of the bio-based binder is in the range of 50-700 mPas, more preferably 100-500 mPas. Preferably, the melting point of the bio-based binder is in the range of 70-95°C, such as 80-90°C.

[0026] According to one embodiment, the dry content of any polymer dispersion that is a precursor to form the bio-based binder coating is in the range of 10-50 wt%, preferably 30-40 wt%.

[0027] Preferably, the density of the bio-based binder coating is between 0.7 and 1.3, more preferably between 0.9 and 1.1 g / cm 3 is within the range. According to one embodiment, the bio-based binder comprises a polylactic acid modified polyester, such as an aromatic aliphatic polyester or copolyester. Preferably, the polyester or copolyester is modified with a polylactide acid, such as polylactic acid, and a filler, preferably calcium carbonate, as an additive. An example of such a bio-based binder includes the commercially available Biodolomer®. Preferably, the density of the modified polyester is between 1.2 and 1.5, more preferably between 1.27 and 1.42 g / cm. 3 Preferably, the modified polyester, which appears in particulate form, adheres to the parchment paper and / or coating of the polysaccharide-based composition by heating the polyester derivative or modified polyester, which causes it to adhere to a contacting surface, such as parchment paper. Preferably, an inorganic filler, such as calcium carbonate, is present in the bio-based binder along with the bio-based binder, such as polylactic acid modified polyester, in an amount of 5-60 wt %, based on the total weight of the bio-based binder composition.

[0028] According to one embodiment, the bio-based binder is coated directly onto the first parchment paper and / or onto the coating of the polysaccharide-based composition. Preferably, a first parchment paper coated according to any embodiment of the invention as described herein is suitably folded to form a sealed volume, preferably by utilizing the adhesive properties available in the polysaccharide-based composition to seal edges, such as adjacent edges, of the folded first parchment paper, thus forming a sealed package enclosing a volume for storage of a food product. Preferably, when further parchment papers include second parchment papers, etc., such parchment papers are laminated to the first parchment paper or additional parchment papers, and the entire structure of parchment papers is folded to form an enclosed volume.

[0029] Preferably, parchment paper is prepared by passing sheets of paper pulp through a bath of sulfuric acid or zinc chloride. This process partially dissolves or gelatinizes the paper. This treatment forms a sulfurized cross-linked material with high density, stability, heat resistance, and low surface energy, which gives it good non-stick or release properties.

[0030] Preferably, the polysaccharide-based composition coating has a thickness in the range of 1-20 μm, most preferably 3-15 μm or 5-15 μm. Preferably, the surface weight of the polysaccharide-based composition coating is 1-20, such as 3-15, such as 5-15 g / m. 2 is within the range.

[0031] According to one embodiment, the polysaccharide-based composition does not include carboxymethylcellulose, starch, or hydroxyethylcellulose. Preferably, the bio-based binder coating has a thickness in the range of 1-80, such as 1-70, more preferably 5-50, such as 7-35 μm. According to one embodiment, the thickness of the bio-based binder coating is in the range of 10-50, such as 20-40, or 25-35 μm.

[0032] Preferably, the surface weight of the bio-based binder is between 1 and 100, for example between 1 and 80, for example between 5 and 50 g / m 2According to one embodiment, the surface weight of the bio-based binder is in the range of 20-50, for example 30-50, or 35-50 g / m 2 The range is.

[0033] Preferably, the particle size of the bio-based binder is in the range of 0.1 to 500 μm, more preferably 0.1 to 100 μm. A bio-based binder coating disposed between the first parchment paper and the polysaccharide-based composition coating may allow for a longer exposure time to foods of a particular water and / or fat content before the polysaccharide-based coating eventually dissolves.

[0034] In view of the bio-based binder, it is noted that packages containing moist foods having a moisture content of at least 15 wt%, such as at least 20 wt% and up to about 100 wt%, preferably 20 wt% to about 90%, preserve the polysaccharide-based composition coating for a longer period of time than in the absence of the bio-based binder.

[0035] The term "polyethylene" is equivalent to "polyethene" and covers a wide range of grades. Polyethylenes are classified according to their density and branching. Their mechanical properties depend heavily on variables such as the degree and type of branching, the crystal structure, and the molecular weight. Preferably, LDPE (low density polyethylene) or HDPE (high density polyethylene) are used, most preferably HDPE (fossil-free), e.g. HDPE produced from sugar cane, bio-based HDPE, etc.

[0036] According to one embodiment, a polyethylene-based and / or bio-based extrudable polymer, such as a polylactic acid modified polyester, forms an outer package that encapsulates an inner package, as described herein.

[0037] Preferably, edges of polyethylene material such as polylactic acid modified polyester and / or bio-based extrudable polymer are welded together to form a sealed package around the inner package, so that the formed package may thus include both a sealed inner package and a surrounding sealed polyethylene-based and / or, for example, polylactic acid modified polyester-based package.

[0038] According to one embodiment, a polyethylene-based package, such as a polylactic acid modified polyester package and / or a bio-based extrudable polymer package, also referred to herein as an outer package, is tightly sealed and / or laminated with an inner package, however, preferably, the inner and outer packages are not laminated or otherwise in contact with each other such that they cannot be released from each other.

[0039] According to one embodiment, a gap remains between the inner and outer packages after they are assembled, which gap may contain air or be evacuated. When opening a package that is manufactured and consists of an inner package or both an inner package and an outer package, a cut is made to open the package simultaneously to form a suitably sized opening. The inner and outer layers can be simply and easily separated from each other after emptying the package of food, thereby allowing for its rapid and efficient recycling. The paper is disposed of separately, and the polylactic acid modified polyester and / or polyethylene are disposed of separately, as these layers are preferably laminated rather than inseparable. The interior of the package can be pulled out of the opening and thus separated from the surrounding polyethylene and / or polylactic acid modified polyester layers, and then disposed of separately.

[0040] The outer package, comprising a polyethylene and / or, for example, polylactic acid modified polyester layer, protects the inner package from moisture in the surrounding environment. The polyethylene and / or, for example, polylactic acid modified polyester layer also prevents part of the food contents from penetrating the entire package, especially during long-term storage. The polyethylene and / or, for example, polylactic acid modified polyester layer thus performs a dual function in preventing the migration of moisture and / or water from both sides of the package. According to one embodiment, the thickness of the polyethylene and / or polylactic acid modified polyester layer ranges from 0.01 to 1 mm, preferably from 0.05 to 0.8 mm, for example from 0.1 to 0.5 mm.

[0041] The coated first parchment paper (and possible additional parchment papers) has a dual function with respect to migration: it can prevent migration of monomers, oligomers and polymers from the outer packaging of, for example, the polyethylene and / or polylactic acid modified polyester layer, out of the enclosed volume, and it can prevent migration into the enclosed volume. Also, the polysaccharide-based composition coated on the parchment paper provides an additional barrier against the migration of monomers, oligomers and polymers.

[0042] According to one embodiment, the inner package is formed by folding the coated parchment paper, for example to form a pentagonal volume, and the folded side edges of the coated parchment paper, preferably the adjacent side edges, are sealed by the overlapping ends of the edges, thereby forming a sealed package. Preferably, the side edges of the foldable paper are provided with flaps, for example flaps extending along the entire length of the edges that are sealed with the adjacent sides. The overlapping ends of the edges can thus be sealed either on the outer surface or on the inner surface of the adjacent edges. Preferably, the polysaccharide-based composition, when still exhibiting adhesive properties, is used as an adhesive to seal the edges of the coated parchment paper. If the polysaccharide-based composition has recently been coated on the first parchment paper, it is sufficient to contact the coated edges with the polysaccharide-based composition, which can create a sealed joint between the edges. If the polysaccharide-based composition does not exhibit sufficient adhesive properties after a certain time has elapsed since it was coated onto the parchment paper, it may be necessary to heat the sealing edge to allow the polysaccharide-based composition to adhere sufficiently.

[0043] According to one embodiment, the outer part of the package is formed by folding the polyethylene and / or polylactic acid modified polyester layer in the same manner as the inner part of the package, so that the polyethylene and / or polylactic acid modified polyester layer tightly covers and contacts the inner part of the package. Preferably, the edges of the polyethylene and / or polylactic acid modified polyester layer after folding are sealed by welding the edges together, thereby obtaining a sealed package. According to one embodiment, the polyethylene and / or polylactic acid modified polyester package is folded and welded to form a seal against the inner package.

[0044] Preferably, by forming the package as a pentagon, the food product contained therein can be easily emptied by pushing out its final contents. Thus, the final remains can be more easily pushed out of such a pentagonal shaped package compared to, for example, a cube shaped package, resulting in less food product being unnecessarily disposed of.

[0045] The manufactured packages can be arranged in a space-efficient manner, for example by stacking pentagonal packages on top of each other, thus forming a box or a rectangular cuboid. The packages can thus fill, for example, the entire volume of a wellboard package, which can then be arranged on a pallet for their shipment.

[0046] The invention also relates to a method of forming a sealed package, wherein a first parchment paper is coated on one side with a polysaccharide-based composition and, optionally, with a bio-based binder, said method comprising folding the first parchment paper to form an enclosed volume, utilizing adhesive properties of the polysaccharide-based composition to seal adjacent folded side edges of said at least first parchment paper to form a sealed package enclosing the food volume.

[0047] The present invention also relates to a method of using the hermetic package for food products having a moisture content greater than 1 wt%, such as greater than 5 wt%, and less than 20 wt%, such as less than 10 wt%. The invention also relates to the use of a hermetically sealed package for food products having a moisture content of at least 25 wt%, such as at least 40 wt% or at least 60 wt%, and less than 50 wt%, or less than 70 wt%, or less than 90 wt%.

[0048] The invention also relates to a method of use of the packaging for food products having a fat content in the range of 1-100 wt%, for example 40-100 wt% or 20-80 wt% or 40-60 wt%. [Brief description of the drawings]

[0049] [Figure 1] 1A-1C illustrate several embodiments of suitable patterns for folding paper at the lines shown to form a package according to the present invention. [Diagram 2] 1A-1C illustrate several embodiments of suitable patterns for folding paper at the lines shown to form a package according to the present invention. [Diagram 3] 1A-1C illustrate several embodiments of suitable patterns for folding paper at the lines shown to form a package according to the present invention. [Figure 4a] FIG. 1 illustrates several different embodiments of the composition of the packaging material. [Figure 4b] FIG. 1 illustrates several different embodiments of the composition of the packaging material. [Figure 4c] FIG. 1 illustrates several different embodiments of the composition of the packaging material. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0050] Text description of the illustration image024.gif. FIG. 1 shows a parchment paper prepared according to the present invention. A sealed package is prepared by folding the paper at the indicated markings. FIG. 2 shows how a package may be produced by folding the paper in a similar manner. Also, FIG. 3 shows the folding pattern to form the package. The package is sealed by gluing adjacent edges of the parchment paper as it is folded. Preferably, the edges include flaps (not shown), which are preferably adhered by a polysaccharide, for example, by applying heat to the edges and / or flaps to improve adhesion and sealing of the formed package. In embodiments containing a bio-based binder, the bio-based binder may also be used as an adhesive material between the edges and / or between the flaps. Also, a bio-based glue may also be used to adhere adjacent edges and / or flaps.

[0051] Figure 4a shows a schematic side view of a package according to one embodiment of the invention and its composition. Layer a) is HDPE (High Density Polyethylene), in particular HDPE made from sugar cane, for example SGF9490. This layer is preferably 0.1-1 mm thick.

[0052] The symbol b in FIG. 4a represents an air gap and c) represents a polysaccharide coating such as Skalax® (based on hemicellulose which may also be combined with bio-based binders).

[0053] Layer d) is a parchment paper such as Super Perga Opatique WS Parchment®. Layer d) is exposed to the contents of the package, e.g. solid or liquid food, and layer a) is exposed to the atmosphere surrounding the package.

[0054] A package consisting only of parchment paper and a polysaccharide-based composition, i.e. without the polyethylene layer a) shown in FIG. 4a, can be used for example for dry or fatty foods, e.g. foods with a moisture content of less than 20 wt.% or less than 10 wt.%.

[0055] FIG. 4c corresponds to FIG. 4a, but a bio-based binder (layer e) is coated on the parchment paper on the side facing away from the enclosed volume. A polysaccharide-based coating c is placed on the bio-based binder e (in FIG. 4c, layers e and c are shown as bonding layers). b) represents an air gap or vacuum. In FIG. 4b, a further parchment paper d) and a bio-based binder e) are added to the structure as shown in FIG. 4c. The further parchment paper is arranged to contact the food stored in the package. As shown in FIG. 4b, the further bio-based binder (layer e) is placed between two parchment papers (layer d). As shown in FIG. 4b and 4c, the package with the layer composition is suitable for moist and / or sour foods, for example foods with a moisture content of more than 20 wt%. As is clear from the invention, the invention may also be implemented without the use of an external package.

[0056] Example 1 The method for total migration from plastics into aqueous food simulants (one-sided contact) by cell (EN 1185-5, certified analysis) was applied, with a 2.25 dm 2 (2.25×10 -2 m 2 ) samples were exposed to 100 ml of acetic acid (used as a simulant). The measurement uncertainty for determining the total migration was ±2 mg / dm 2 It is.

[0057] Sample: Parchment paper + high density polyethylene plastic (the parchment paper was placed closest to the food simulant). Migration Simulator 3% acetic acid was used as a simulant. Reporting limit: 2 mg / dm 2 .

[0058] Test conditions 20 days, 40°C (20 days in this study corresponds to 1 year of exposure). result Total migration (mg / dm 2In the samples, the mean values ​​were 7.6 and 7.3, respectively (mean result 7.5). According to Delegated Regulation (EU) No. 10 / 2011, the total migration limit is 10 mg / dm 2 After 20 days of transfer, there were no visible particles in the food simulant.

[0059] Example 1 shows that uncoated parchment paper in contact with acidic and / or moist foods (acetic acid is an established simulant in this test) remains intact and has good migration properties.

[0060] Example 2 Greaseproof parchment paper, 65 grams per square meter, provided by Nordic Paper was used.

[0061] Skalax from Seelution (a hemicellulose-based polysaccharide) was used as the polysaccharide and BIM BA85015X was used as the bio-based binder (latex-based SBR-latex).

[0062] Coatings were prepared by a bench rod coater, a dryer with both hot air and IR heaters. Parchment paper was coated using a bench rod coater. The sheets were dried in an oven at 180° C. for approximately 1.5 minutes. The sheets were acclimated to 23° C. and 50% relative humidity (RH) for at least 1 hour before evaluating the surface properties.

[0063] The hydrophobicity of the surface was evaluated for 300 seconds using the Cobb300 (ISO 535) method. For the evaluation of grease resistance, the KIT (TAPPI T-559 pm-96) was used. 2 A piece of each was weighed and compared to the uncoated paper to determine the weight of the coating per square meter.

[0064] The COBB300 test was used to determine the amount of water that can be absorbed into the surface of paper or board in a given time. Samples were evaluated by the COBB300 (ISO 535) method for 300 seconds. Duplicate tests were performed. Grease resistance was measured with the KIT test (TAPPI T-559 pm-96) and reported as a value between 0 and 12. The highest number of KIT test fluid that does not penetrate the surface of the substrate is the outstanding grease resistance (KIT number).

[0065] Skalax and BIM BA85015X according to above were available as pre-prepared solutions so no further preparation was necessary. Samples were coated according to the following in the order shown by rod number 2 (color code: red). The following samples were prepared: Sample 111: Skalax (polysaccharide) 5.5g / m2 coated on parchment paper 2 Sample 112: Skalax 5.5g / m2 coated on parchment paper 2 ; Bim BA85015X (bio-based binder) coated on Skalax 10.6g / m 2 Sample 116: Bim BA85015X (bio-based binder) 8.9 g / m2 coated on parchment paper 2 ; Skalax 5.3g / m2 coated on bio-based binder 2 .

[0066] [Table 1] The table shows that samples 111, 112 and 116 according to the invention have good Cobb300 and KIT values. Example 3 - Oxygen permeability To measure the ability of a packaging material to prevent oxygen from passing through it, standard methods ASTM D3985 and ISO 15105-2 were used.

[0067] OTR (Oxygen Transmission Rate) is the steady state rate at which oxygen gas permeates a film or laminate at a specified temperature and relative humidity (value % RH). Biodolomer® available from Gaia Biomaterials, a granular modified polyester of polylactic acid and calcium carbonate as a filler, was used as the bio-based binder.

[0068] sample Sample 111: The above. Sample 101: Finnfix® 10 Dry (carboxymethylcellulose) 20 g / m2 coated on both sides of parchment paper 2 8g / m from TCI Europe 2 Hydroxyethylcellulose and 4.6g, 43% solids Barrisurf LX® slurry (mineral) from Imerys was coated onto the Finnfix on both sides of the parchment paper. Sample 120: Like 111, but with the addition of 42 g / m2 on the side of the first parchment paper facing the enclosed volume. 2 The Biodolomer® coating was applied to the second parchment paper in an amount of 42 g / m2, which also formed a coating on the second parchment paper laminated on the side of the first parchment paper facing away from the enclosed volume. The package structure calculated from the enclosed volume was therefore: second parchment paper, Biodolomer® coating 42 g / m2 2 , No. 1 parchment paper, Skalax coated 5.5g / m 2 Includes.

[0069] Sample 101 was prepared from a solution of FinnFix by adding 20 g of Finnfix 10 Dry to 180 g of tap water while mixing. The mixture was heated to 50° C. and maintained at that temperature. Once the Finnfix was completely dissolved, rod number 3 (color code: green) was used to coat parchment paper. The reverse side of sample 101 was coated with rod number 1 (color code: yellow).

[0070] A solution was then prepared by mixing 184.6 g of tap water with 8 g of HEC and 4.6 Barrisurf LX slurry. The mixture was heated to 50° C. and maintained at that temperature. Once a homogeneous mixture was obtained, coating was started using rod number 3 (color code: green) on the formed Finnfix coating.

[0071] Results from oxygen transmission rate (OTR) showed that sample 111 (invention) has a very good OTR. Sample 101 (reference) is considered equivalent to polyethylene, i.e. not capable of being used as an OTR barrier. 10 cc / m 2 24h (mL / m 2 When considering results from OTR measurements below 24h), the materials at those levels are considered true oxygen barriers. Sample 120 shows similarly excellent results.

[0072] [Table 2] Example 4 - Migration in vegetable oil simulants Migration studies were conducted using isooctane as a simulant to mimic vegetable oil, as follows: Contact area sample: 0.45dm 2 Volume of isooctane: 50ml The screening results after transfer to isooctane are shown in Table 3. The results were 2 Based on the conventional EU food contact rate of 1 kg of food in contact with a surface area of ​​100 mg / kg foodstuff and / or mg / 6 dm 2 The calculations are based on a starting volume of 50 ml simulant.

[0073] The LOQ for this analysis is 0.01 mg / kg (ppm) food, therefore components with concentrations below the LOQ are not reported in Table 3.

[0074] [Table 3] Table 3 shows the retention times (RT) of unbranched alkanes (different species). As can be seen from Table 3, when the alkanes coming from the bio-based binder coating have to pass through both the Skalax coating and the parchment paper (sample 112), the migration is clearly lower than when the bio-based binder coating is placed directly on the parchment paper. Thus, Table 3 shows that the Skalax layer (polysaccharides) contributes to the reduction of migration.

[0075] Example 5 Test methods were performed to look at different laminates and their ability to remain intact after exposure to various foodstuffs. The tests were designed as accelerated tests using the Arrhenius formula and elevated temperatures with an acceleration factor of approximately 50. When considering the different tables showing the time to rupture (leakage), all measured periods must be multiplied by 50 to arrive at the corresponding time to rupture at room temperature.

[0076] The design of the experimental procedure involved glass bottles, caps, and packaging materials, as described in the table below. The foodstuffs were placed on top of the packaging material, and the backside of the material was observed optically, i.e. the visibility of the spots on the backside. The observations started after 5 minutes and ended after 20 hours. None of the samples in the test remained intact after 900 minutes. The temperature was set at 75° C. The foodstuffs were therefore placed on the surface corresponding to the volume formed according to the invention.

[0077] Meatball test The meatballs used were Swedish style meatballs available from Scan.

[0078] Sample 103 was prepared like Sample 101, but the coating on the side of the parchment paper facing away from the side on which the foodstuff (such as meatballs) was placed (corresponding to the bottom side in this test) was left uncoated. Sample 121 is a paper stack with the following order of layers when viewed from the inside, i.e. the side on which the foodstuff was placed corresponds to the inner surface of the formed volume of the package: a second parchment paper (65 g / m 2 ), Skalax (5.5g / m 2 ), Biodolomer (42g / m 2 ), parchment paper (65g / m 2 ), Skalax (5.5g / m 2 ). Sample 121 was also used in the following Gravado salmon and pickled cucumber tests.

[0079] [Table 4] From the results it can be shown that samples 101 and 103 (reference) have moisture leakage, i.e. material failure, after 60 minutes. According to the present invention, samples 111, 112 and 116 each showed leakage, i.e. material failure, after 240 minutes. As can be seen from Table 4, sample 121 (according to the present invention) showed excellent performance compared to all other samples. The difference between the different sets of samples was significant. It is noteworthy that this is a 50-fold accelerated test, and the difference between the samples according to the present invention and the references 101 and 103 became very large.

[0080] Graved Salmon Trial The salmon was standard Swedish Glavad salmon. The salmon was left in a mixture of salt, sugar, and oil for three days. The fish was then dried on paper and cut into small pieces.

[0081] [Table 5] From the results it can be seen that samples 101 and 103 (reference) have moisture leakage, i.e. material failure, after 60 minutes. In accordance with the present invention, samples 111, 112, and 116 each showed leakage, i.e. material failure, after 240 minutes. As can be seen from Table 5, sample 121 showed excellent performance compared to all other samples. The difference between the different samples was significant. It is noteworthy that this is a 50 times accelerated test, and the difference became very large.

[0082] Cucumber test in acetic acid The test was carried out with cucumbers containing the same amount of acetic acid by weight. The cucumbers used were Felix® Aettiksgurka (pickled cucumbers).

[0083] [Table 6] The results show that samples 101 and 103 (reference) show moisture leakage, i.e., material failure, after 60 minutes. In accordance with the present invention, samples 111 and 112 each showed leakage, i.e., material failure, after 240 minutes. Sample 116 (invention) was significantly better than samples 101 and 103 (reference), but not as good as 111, 112, and 121 (invention). It was observed that samples 111 and 112 should be considered significantly better than sample 116. As can be seen from Table 6, sample 121 showed excellent performance compared to all other samples. It is noteworthy that this is a 50-fold accelerated test, and the difference is very large.

Claims

1. i) a first parchment paper that encloses and forms a volume for storing food; ii) ii.a) on one side of the first parchment paper; or ii.b) on a bio-based binder coating directly coated on one side of the first parchment paper. Polysaccharide-based composition coated on wherein the polysaccharide-based composition is coated on a side of the sealed package facing away from the formed volume.

2. 10. The sealed package of claim 1, wherein the first parchment paper is pretreated with a sizing agent selected from resin and / or rosin.

3. The sealed package according to claim 1 or 2, wherein the polysaccharide-based composition comprises hemicellulose, microfibril cellulose, nanofibril cellulose, or a mixture thereof.

4. The sealed package according to any one of claims 1 to 3, wherein the first parchment paper does not contain a silicone-based compound and / or a fluorine-based compound.

5. The sealed package according to any one of claims 1 to 4, wherein the polysaccharide-based composition comprises microfibril and / or nanofibril cellulose.

6. The sealed package of any one of claims 1 to 5, wherein the bio-based binder is coated directly onto the first parchment paper and / or onto the coating of the polysaccharide-based composition.

7. 7. The sealed package of any one of claims 1 to 6, wherein a second parchment paper coated with a bio-based binder is laminated to the first parchment paper on a side of the sealed package closest to the formed volume, the bio-based binder coating being disposed between the first and second parchment papers.

8. The sealed package according to any one of claims 1 to 7, wherein the polysaccharide-based composition coating has a thickness in the range of 1 to 20 μm.

9. The sealed package according to any one of claims 1 to 8, wherein the bio-based binder coating comprises latex, wax, polylactic acid modified polyester, derivatives and / or mixtures thereof.

10. A sealed package according to any one of claims 1 to 9, wherein a polyethylene-based and / or bio-based extrudable polymer package forming an outer package encapsulates the sealed package according to any one of claims 1 to 9.

11. The sealed package of claim 10, wherein the outer package is tightly sealed to the sealed package of claim 10.

12. 11. The sealed package of claim 10, wherein a gap between the sealed package of claim 10 and the outer package contains air or is evacuated.

13. The sealed package of any one of claims 1 to 12, wherein the bio-based binder coating comprises a polylactic acid modified polyester.

14. The hermetically sealed package of any one of claims 1 to 13, wherein the bio-based binder coating has a thickness in the range of 5 to 50 μm.

15. The sealed package according to any one of claims 1 to 14, wherein the polysaccharide-based composition does not contain carboxymethylcellulose, starch, or hydroxyethylcellulose.

16. 7. The sealed package of any one of claims 1 to 6, wherein a second parchment paper is coated with a polysaccharide-based composition and a bio-based binder is coated onto the formed polysaccharide-based composition coating, and the second parchment paper closest to the sealed volume is laminated to the first parchment paper, and the coating of the polysaccharide-based composition and the bio-based binder coating are disposed between the first and second parchment papers.

17. 17. The method of forming a sealed package according to any one of claims 1 to 16, wherein the first parchment paper is coated on one side with a polysaccharide-based composition and, optionally, with a bio-based binder, the first parchment paper is folded to form an enclosed volume, and adhesive properties of the polysaccharide-based composition are utilized to seal at least adjacent folded side edges of the first parchment paper to form the sealed package enclosing a food volume.

18. Use of the sealed package according to any one of claims 1 to 16 for food products having a moisture content of less than 20 wt%.

19. Use of the sealed package according to any one of claims 1 to 16 for food products having a moisture content of at least 25 wt%.

20. Use of the sealed package according to any one of claims 1 to 16 for food products having a fat content in the range of 40 to 100 wt%.

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