WO2022123257A2 - Matériau d'emballage stratifié - Google Patents

Matériau d'emballage stratifié Download PDF

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Publication number
WO2022123257A2
WO2022123257A2 PCT/GB2021/053230 GB2021053230W WO2022123257A2 WO 2022123257 A2 WO2022123257 A2 WO 2022123257A2 GB 2021053230 W GB2021053230 W GB 2021053230W WO 2022123257 A2 WO2022123257 A2 WO 2022123257A2
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WIPO (PCT)
Prior art keywords
barrier
paper
packaging material
grammage
laminated packaging
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Ceased
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PCT/GB2021/053230
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English (en)
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WO2022123257A3 (fr
Inventor
Keith Damarell
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Individual
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Individual
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Publication of WO2022123257A3 publication Critical patent/WO2022123257A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B9/06—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/12—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/26—All layers being made of paper or paperboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/12—Coating on the layer surface on paper layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/20—Inorganic coating
    • B32B2255/205—Metallic coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B32B2307/4023—Coloured on the layer surface, e.g. ink
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/414—Translucent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/716—Degradable
    • B32B2307/7163—Biodegradable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7246—Water vapor barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers
    • B32B2439/46—Bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers
    • B32B2439/60—Bottles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers
    • B32B2439/62—Boxes, cartons, cases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2275/00—Details of sheets, wrappers or bags

Definitions

  • the invention relates to the field of packaging, in particular a laminated packaging material.
  • the packaging material finds particular application in food packaging, in particular in the formation of packaging containers for food products.
  • Cup, food tray and tube packaging solutions that are suitable for long shelflife products (e.g. dry, instant noodles and potato chips and other dry food snacks as well as meats and other proteins), are generally made by including materials based on aluminium metalised plastics such as metalised BOPP, metalised OPP, metalised PP and metalised PE. Alternatively, heavy weight plastics can be used. Many products are sensitive to oxygen. Fats and oils upon exposure to oxygen, especially in the presence of light, undergo chemical changes which lead to flavor alterations referred to as rancidity. The goal of these materials is to provide a barrier to light, oxygen, and moisture vapour as well as grease and oil. In the case of cups, the aim is also to provide liquid water barrier.
  • aluminium metalised plastics such as metalised BOPP, metalised OPP, metalised PP and metalised PE.
  • heavy weight plastics can be used.
  • Many products are sensitive to oxygen. Fats and oils upon exposure to oxygen, especially in the presence of light, undergo chemical changes which lead to flavor alterations referred to as rancidity.
  • a light and oxygen barrier is required to stop protein materials becoming rancid over time and a moisture vapour barrier is required to keep dry foods from absorbing moisture and “clumping” or “softening” over time.
  • snacks packaging is gas flushed to remove oxygen.
  • Meat trays are also often gas flushed to remove oxygen and extend shelf life. In such flushed products it is important to provide a robust oxygen barrier in order to prevent degradation of the product during the ingress of oxygen.
  • Instant dry noodles are often packaged in a heavy gauge plastic cup which is sealed with a metalised plastic film lid or plastic laminated aluminium foil lid and then overwrapped with a printed paper board wrap.
  • the heavy gauge plastic provides a secure liquid barrier so that the cup can be used when the product is consumed, but the packaging as a whole is also required to provide an oxygen and a moisture barrier for storage of the product prior to use.
  • Paper based cups are typically produced using a polyethylene lined board to provide liquid water barrier with heat sealability properties to allow conversion of cup forming machines that use heat to weld the cup side and bottom together.
  • Tubes made for dry snack packaging are often made using spiral wound board with layers of metalised plastic on the inside and a metalised plastic film lid to seal the tube.
  • a moisture and oxygen barrier is required to prevent softening of the snack.
  • Trays made for fresh meat and poultry are designed for gas flushing and are made from non- recyclable and non-compostable plastics. They are designed to provide an oxygen and liquid barrier to prevent the meat from degrading. Similar trays are also used for some fruit and vegetable packaging.
  • a laminated packaging material comprising: an outer layer comprising a barrier paper with a grammage of between 25gsm and 200gsm; a middle layer comprising a translucent tracing paper with gas barrier properties at a grammage of between 30gsm and lOOgsm; and an inner layer comprising a barrier paper with a grammage of between 25gsm and 200gsm.
  • Tracing paper has useful packaging properties in providing a gas-barrier, which can reduce the degradation of food products stored within. However, it is not generally used as a commercial packaging material, particularly within the food packaging industry, since it has little resistance to liquid or water vapour and can become damp and lose its integrity. Moreover, when not wet, tracing paper is often too brittle to withstand modem mechanised production lines and supply chains.
  • the present aspect provides a packaging material that combines the advantages of tracing paper with additional outer and inner layers of barrier paper to provide protection for the translucent tracing paper layer. This results in a laminating packaging material that is conventionally repulpable and biodegradable, cost-effective and has many uses, as set out in more detail herein.
  • the translucent tracing paper is metalised with a metal layer having a thickness of less than 50nm, preferably less than 40nm, further preferably 20 nm. It has been found that depositing a nano-thick layer of metal, such as aluminium (or aluminum) onto the translucent tracing paper can improve the barrier properties of the packaging material without effecting its recyclability. In particular, even a metalised layer of a nano-thickness can significantly improve the light barrier properties of the packaging material.
  • the metalised layer may be applied to the inner or outer paper layer.
  • the effectiveness of the metalised layer is significantly enhanced if applied to the translucent paper layer, since it provides a very smooth surface for its application.
  • the metalised layer can also enhance the gas barrier properties of the translucent paper.
  • each barrier paper comprises a barrier coating that allows the paper to be repulpable and biodegradable. That is all of the barrier coatings in the packaging material are preferably repulpable and biodegradable. This enables the material to be more easily recycled when compared to some plastics-coated packaging materials.
  • At least one barrier paper comprises a moisture vapour barrier coating, optionally wherein both the inner and outer layers comprise barrier papers having a moisture vapour barrier coating.
  • the translucent tracing paper itself does not provide a barrier to moisture vapour, which can cause degradation of the paper
  • one or both of the outer and inner layers of the packaging material preferably prevents the ingress of water vapour by having a moisture vapour barrier coating.
  • the arrangement of this coating may depend on the application of a particular packaging material; for example packaging for dried goods may have the moisture vapour barrier coating provided on the outside layer.
  • the barrier paper comprises a coating that provides at least one of a grease barrier, a light barrier and a liquid water barrier.
  • the barrier coating of the outer and/or inner layer may be arranged to have one ore more additional properties depending on the intended use of the packaging as described in more detail herein.
  • the barrier coating of the inner layer comprises a heat sealable barrier coating.
  • the heat sealable coating can be used to cause the inner layer to adhere to other packaging products (for example to form a lid) with the application of heat to parts of the material. It can also be used to cause the packaging material to adhere to itself, for example to form a bag or packet or a spiral wound tube. This increases the number of potential uses of the packaging material.
  • the heat sealable barrier coating may be an additional coating to other barrier coatings already applied to the inner layer, or preferably other barrier coatings are provided with additional heat seal properties and a single barrier coating with multiple properties can therefore be provided.
  • the barrier coating of the outer layer is heat sealable to a barrier coating on the inner layer.
  • a heat seal coating on the outer layer in addition to the heat seal coating on the inner layer, can improve the adherence of layers of the packaging material to itself. This can be useful in forming a more solid structure, for example a spiral wound tube.
  • the outer layer comprises an over-printable coating.
  • the packaging is repulpable and biodegradable using conventional techniques.
  • the middle layer comprises a transfer metallized or vacuum metallized layer. That is, the nano-thick metalised layer may be applied to the translucent tracing paper using transfer metallization or vacuum metallization techniques. This can provide a uniform nanothick metal layer.
  • the layers are laminated together using a water based adhesive, optionally a PVA adhesive.
  • the layers are laminated together using a solvent based or pressure sensitive adhesive lamination technique.
  • the laminated packaging material includes: an outer layer comprising paper with a grammage of between 50gsm and 150gsm, a barrier coating that provides a moisture vapor barrier, a liquid water barrier, and a grease barrier; a middle layer comprising an aluminium metalised translucent tracing paper with a grammage of between 40gsm and lOOgsm; and an inner layer comprising paper with a grammage of between 50gsm and 150gsm with a heat sealable coating that provides a liquid water barrier and grease barrier; wherein the barrier coating on the outer layer is heat sealable to the barrier coating on the inner layer.
  • the packaging material may be shaped and heat sealed to form a receptacle, preferably a generally cylindrical cup.
  • a cup may be particularly useful to hold dried food products, for example dried noodles.
  • Such products require light barrier, oxygen barrier, moisture vapor barrier, liquid water barrier, grease barrier and heat sealability properties, as provided by the present embodiment, which also remains conventionally repulpable and compostable/biodegradable.
  • the laminated packaging material includes: an outer layer comprising paper with a grammage of between 50gsm and 150gsm, the paper having an over-printable barrier coating that provides a moisture vapor barrier and a grease barrier; a middle layer comprising an aluminium metalised translucent tracing paper with a grammage of between 40gsm and lOOgsm; and an inner layer comprising paper with a grammage of between 50gsm and 150gsm with a coating that provides a moisture vapor barrier and a grease barrier.
  • the packaging material may be spiral wound and fixed to form a tubular structure.
  • Such a structure may be particularly useful to hold dried goods such as crisps (chips) that require a high barrier functionality against light, water, moisture vapour, oxygen and grease.
  • the packaging also remains conventionally repulpable and compostable/biodegradable.
  • the laminated packaging material includes: an outer layer comprising paper with a grammage of between 50gsm and 150gsm, an over-printable barrier coating that provides a moisture vapor barrier, a liquid water barrier and a grease barrier; a middle layer comprising an aluminium metalised translucent tracing paper with a grammage of between 40gsm and lOOgsm; and an inner layer comprising paper with a grammage of between 50gsm and 150gsm with a coating that provides a liquid water barrier, a moisture vapor barrier and a grease barrier.
  • the packaging material may be formed and fixed to create a container, optionally a box or tray container.
  • the packaging material may be formed into a container to hold wet food products such as meat, fruit or vegetables, since the packaging provides a light barrier, oxygen barrier, water barrier, grease barrier and moisture vapor barrier whilst remaining conventionally repulpable and compostable/biodegradable.
  • the laminated packaging material includes: an outer layer comprising paper with a grammage of between 25gsm and 50gsm, the paper having an over-printable barrier coating that provides a moisture vapour barrier, a liquid water barrier and a grease barrier; a middle layer comprising an aluminium metalised translucent tracing paper with a grammage of between 30gsm and 50gsm; and an inner layer comprising paper with a grammage of between 25gsm and 50gsm, the paper having a heat-sealable barrier coating that provides a moisture vapour barrier, a liquid water barrier and a grease barrier.
  • the packaging may be cut to form a lid for heat sealing to a container.
  • the packaging material of this embodiment is made from a thinner grade of paper than the previously-described embodiments to provide a more flexible material suitable for use as a lid on many packaging products. However, the material still provides a light barrier, oxygen barrier, water barrier, grease barrier and moisture vapor barrier whilst remaining conventionally repulpable and compostable/biodegradable.
  • Figure 1 is a schematic illustration of a laminated packaging material according to one embodiment
  • Figure 2 is a schematic illustration of a laminated packaging material according to a second embodiment.
  • the laminated packaging material comprises a three-layer structure including a middle layer comprising a translucent tracing paper.
  • Translucent or transparent paper is also referred to as tracing paper.
  • This is paper produced using cellulose fibres from wood pulp that have been refined to a level that produces a paper with minimum air content within the paper sheet.
  • the extensive refining of the fibres creates micro-fibrillated cellulose fibres and intense inter-fibre hydrogen bonding. This creates a strong, dense and clean paper without any need for fillers and the elimination of air within the sheet provides transparency or translucency.
  • the additional benefit is that translucent paper of the required specification has a natural barrier to oxygen and grease.
  • the material has very little resistance to water or water vapour.
  • a useful packaging material can be achieved.
  • the additional layers can also provide the required physical properties needed to be used for certain applications that the translucent paper itself could not meet, for example resulting in a less brittle and more flexible material.
  • the packaging material includes two additional layers arranged on either side of the translucent tracing paper. These comprise paper layers wherein each paper is provided with a barrier coating.
  • Water-based dispersion barrier coatings are used in embodiments described herein to provide barrier properties against moisture, gases, and grease and where required, to provide heat seal properties.
  • the main component of a suitable coating that can be used in the packaging described herein is synthetic latex that binds the coating to the substrate paper and forms a continuous, non-porous film that provides good barrier properties.
  • Pigments can be used to provide a surface with the desired appearance, printability, and barrier properties.
  • the formulation of the barrier coating can be selected based on the required properties of the particular application, as described herein.
  • a single barrier coating is provided on each laminate paper layer, the coating being selected to provide the appropriate properties for the final application of the end product, the skilled person will appreciate that it would be possible to coat one or more of the paper layers with multiple barrier coatings, for example a liquid water barrier coating could be overlaid with a heat-seal coating in order to impart the necessary properties to a particular layer of the laminate.
  • the term “outer” and “inner” describe the layers laminated to either side of the middle translucent paper layer. The terms are used in this way since, once the packaging is formed into a cup, tube or other packaging product, the “inner” layer is intended to be arranged on the inside of the packaging, nearest to the food or other packaged product, while the “outer” layer is arranged on the outside.
  • the layers may equally be termed a “first” and “second” layer, with the middle layer arranged therebetween and this terminology may be more appropriate in some circumstances, for example if the packaging material is arranged for use as a flat wrap product.
  • the inner and outer layers may be identical in some embodiments.
  • one or more of the layers may be metalised with a nano-thick coating of a metal such as aluminium.
  • the layer may be transfer metallized or vacuum metallized and a typical thickness for the metal layer would be 25 nanometers.
  • other layer thicknesses may be achieved for certain applications.
  • a high optical density version can be produced with a metallised layer of up to 40 nanometers. This further increases the light barrier properties of the material.
  • a metal thickness of 40 nanometers is considered insignificant within standard recycling processes so and both layers are readily repulpable and compostable.
  • this nano-thick layer compares to standard aluminium foil used in packaging lamination which is 6.5 to 8 microns and is therefore not repulpable or compostable.
  • the inner or outer layers may be omitted from the laminate.
  • Each layer is “wet glue” laminated together on a laminating machine using water based adhesives such as PVA adhesives that are conventionally repulpable and biodegradable.
  • water based adhesives such as PVA adhesives that are conventionally repulpable and biodegradable.
  • Other lamination techniques can be used including solvent based and pressure sensitive adhesive lamination.
  • compostable refers to industrial composting, in which the packaging meets the requirements set out in standard EN13432 (Requirements for packaging recoverable through composting and biodegradation. Test scheme and evaluation criteria for the final acceptance of packaging.) where it needs to compost within 6 weeks at elevated temperatures, and compost to at least 90% carbon dioxide at a temperature of 58°C +/- 2°C within 6 months.
  • the packaging may be home compostable, disintegrating without the need for artificially raised temperature (for example according to the Belgian Vincotte certification scheme under which it needs to biodegrade to at least 90% carbon dioxide under ambient temperatures of 20-30°C within a year).
  • a compostable product degrades to carbon dioxide, water and biomass that is non toxic over a reasonably short time.
  • biodegrade refers more broadly to the material degrading either in aerobic or anaerobic conditions or marine conditions over longer time periods.
  • Fig. 2 is a schematic diagram of a laminated packaging material according to one embodiment.
  • the packaging material includes
  • An outer layer of paper or paper board (212). This paper/board is be coated with an barrier coating (210).
  • a middle layer comprising a translucent paper (tracing paper) (216)
  • the layers are laminated together using water based adhesives (214, 220) such as PVA adhesives that are conventionally repulpable and biodegradable.
  • water based adhesives such as PVA adhesives that are conventionally repulpable and biodegradable.
  • solvent based or pressure sensitive adhesive lamination techniques can be used.
  • Each of the layers, and the laminated packaging material as a whole, is conventionally repulpable and biodegradable.
  • a particular embodiment provides a solution for a cup for packaging products such as dried noodles.
  • the material provides an effective light barrier, oxygen barrier and moisture vapor barrier in addition to providing a liquid water barrier and grease barrier. It also enables heat sealing whilst maintaining recyclability by conventional paper-making repulping and compostability.
  • the cup is illustrated schematically in Fig. 1 and is manufactured from a paper based three or more layer laminate material including:
  • This paper/board may be coated with a coating (110) that also provides some moisture vapour barrier, grease barrier and liquid water barrier and is heat sealable to the barrier coating on the inner layer.
  • This layer is conventionally repulpable and biodegradable.
  • a middle layer comprising an aluminium metalised (118) translucent paper (tracing paper) (116) at a grammage of between 40gsm and lOOgsm.
  • Metalising can be via transfer metallization or vacuum metallization.
  • This middle layer exhibits excellent oxygen and moisture vapour barrier.
  • the combination of translucent paper and nano thin aluminium is conventionally repulpable and biodegradable.
  • This barrier coating may also contribute to moisture barrier resistance.
  • This layer is conventionally repulpable and biodegradable.
  • each layer is “wet glue” laminated together on a laminating machine using water based adhesives (114, 120) such as PVA adhesives that are conventionally repulpable and biodegradable.
  • water based adhesives such as PVA adhesives that are conventionally repulpable and biodegradable.
  • solvent based or pressure sensitive adhesive lamination techniques can be used.
  • the laminate construction provides high barrier functionality against light, water, moisture vapour, oxygen and grease whilst remaining conventionally repulpable and compostable.
  • the laminated packaging material may be manufactured as a sheet material or in a reel.
  • sheet and reel material is typically used, with the side walls being made from sheets and the base being made from material formed as a narrow reel.
  • the type of material used to form the final packaging product may be selected depending on the manufacturing process.
  • the material is then joined in places by a heat sealing method, for example along the seam of the cup and around the base, to form the final packaging product.
  • the material may be formed into the shape of a container or box.
  • the material may be particularly suitable for using to form containers for holding dry powdered goods, such as baby formula or powdered drinks or cooking sauces.
  • a container may be formed by curving sheets of laminated material into a rectangular shape with rounded corners to form the sides of the container and then heat-sealing a base to the formed container sides.
  • the base may be fixed to the container side walls using an adhesive.
  • a lid may also be formed using the materials described herein (for example as described in more details in the section entitled Lids below). This enables the entire container to be repulped or composted as a single unit.
  • a lid may be formed from a plastics-based material that can be removed as a whole unit before the rest of the packaging is sent for repulping.
  • a container manufactured from the material provides a barrier against light, oxygen and moisture vapor as well as against liquid water and grease. These are important factors in ensuring any powdered or dried product does not degrade by absorbing moisture and clumping together or lose flavour or colouring. As noted above, the material also enables heat sealing whilst maintaining recyclability by conventional paper-making repulping and compostability.
  • a further embodiment provides a paper based snack tube.
  • Existing tubes are typically produced using a spiral wound multilayer construction consisting of a printed paper (outside), paper board (middle) and metalised multilayer plastic film (inside) to provide moisture vapour, grease, light and oxygen barrier. This combination of materials renders the construction to be non recyclable.
  • the packaging material described below enables the manufacture of tubes providing an effective light barrier, oxygen barrier, grease barrier and moisture vapor barrier whilst remaining conventionally repulpable and compostable.
  • the tube is manufactured from a paper based three or more layer laminate material including:
  • This paper/board may be coated with an over-printable coating (110) that provides moisture vapour barrier and grease barrier.
  • This layer is conventionally repulpable and biodegradable.
  • a middle layer comprising an aluminium metalised (118) translucent paper (tracing paper) (116) at a grammage of between 40gsm and lOOgsm.
  • Metalising can be via transfer metallization or vacuum metallization.
  • This middle layer exhibits excellent oxygen and moisture vapour barrier.
  • the combination of translucent paper and nano thin aluminium is conventionally repulpable and biodegradable.
  • each layer is “wet glue” laminated together on a laminating machine using water based adhesives (114, 120) such as PVA adhesives that are conventionally repulpable and biodegradable.
  • water based adhesives such as PVA adhesives that are conventionally repulpable and biodegradable.
  • solvent based or pressure sensitive adhesive lamination techniques can be used.
  • the laminate construction provides high barrier functionality against light, water, moisture vapour, oxygen and grease whilst remaining conventionally repulpable and compostable.
  • the laminated packaging material may be manufactured as a sheet material or in a reel.
  • a reel form of the material will be used to form the tube in a spiral winding method.
  • the material is then joined in places by water-based adhesive, to form the tube.
  • the type of material used to form the final packaging product may be selected depending on the manufacturing process.
  • a further embodiment enables the production of trays, in particular for the packaging of meat products.
  • the trays are made of plastic materials that provide high gas barrier but are not readily recyclable. Some use dark colours such as black to minimise light transmittance and so further reduce the recyclability.
  • the present embodiment provides a product with an effective light barrier, oxygen barrier, water barrier, grease barrier and moisture vapor barrier whilst remaining conventionally repulpable and compostable.
  • the construction can be used to create a glued tray construction or a pressed paper tray construction.
  • the tray is illustrated schematically in Fig. 1 and is manufactured from a paper based three or more layer laminate material including: 1.
  • This paper/board may be coated with a printable barrier coating (110) that provides moisture vapour barrier, water and grease barrier.
  • This layer is conventionally repulpable and biodegradable.
  • a middle layer comprising an aluminium metalised (118) translucent paper (tracing paper) (116) at a grammage of between 40gsm and lOOgsm.
  • Metalising can be via transfer metallization or vacuum metallization.
  • This middle layer exhibits excellent oxygen and moisture vapour barrier.
  • the combination of translucent paper and nano thin aluminium is conventionally repulpable and biodegradable.
  • This layer is conventionally repulpable and biodegradable.
  • each layer is “wet glue” laminated together on a laminating machine using water based adhesives (114, 120) such as PVA adhesives that are conventionally repulpable and biodegradable.
  • water based adhesives such as PVA adhesives that are conventionally repulpable and biodegradable.
  • solvent based or pressure sensitive adhesive lamination techniques can be used.
  • the laminate construction provides high barrier functionality against light, water, moisture vapour, oxygen and grease whilst remaining conventionally repulpable and compostable.
  • the laminated packaging material is preferably manufactured as a sheet material and is then cut and formed into the necessary shape to form the tray.
  • the material is then joined in places by water-based adhesive, for example along the sides of the tray, to form the final packaging product.
  • a pressed paper tray may be formed from shaping the laminated material.
  • a further embodiment provides a solution to create an alternative material for a lid providing an effective light barrier, oxygen barrier, water barrier, grease barrier and moisture vapor barrier whilst remaining conventionally repulpable and compostable.
  • the construction can be used to create a heat sealed lid solution for a glued or pressed paper tray and a cup.
  • the lid is illustrated schematically in Fig. 1 and is manufactured from a paper based three or more layer laminate material including:
  • This paper may be coated with a printable barrier coating (110) that provides moisture vapour barrier, water and grease barrier.
  • This layer is conventionally repulpable and biodegradable.
  • a middle layer comprising an aluminium metalised (118) translucent paper (tracing paper) (116) at a grammage of around 40gsm.
  • Metalising can be via transfer metallization or vacuum metallization.
  • This middle layer exhibits excellent oxygen and moisture vapour barrier.
  • the combination of translucent paper and nano thin aluminium is conventionally repulpable and biodegradable.
  • This layer is conventionally repulpable and biodegradable.
  • each layer is “wet glue” laminated together on a laminating machine using water based adhesives (114, 120) such as PVA adhesives that are conventionally repulpable and biodegradable.
  • water based adhesives such as PVA adhesives that are conventionally repulpable and biodegradable.
  • solvent based or pressure sensitive adhesive lamination techniques can be used.
  • the laminate construction provides high barrier functionality against light, water, moisture vapour, oxygen and grease whilst remaining conventionally repulpable and compostable.
  • the laminated packaging material may be manufactured as a sheet material or in a reel. To form a lid, the material is preferably formed into a reel and is then cut to the required size and shape. The material can then be heat sealed method to another packaging material, such as a cup or tray as described herein. Alternatively the material may be folded and heat sealed to itself, for example to form a bag or packet.
  • Typical barrier properties for the material formed as described above are set out in the table below. Similar properties are provided for the cup, tube, tray and lid. The standard tests for each of these properties are referred to in the table below and will be well known to the person skilled in the art; however further details of the relevant tests are also provided below the table.
  • ASTM D3985 is standard test method for Oxygen gas transmission rate through plastic film and sheeting using a coulometric sensor. This method covers a procedure for determination of the steady-state rate of transmission of oxygen gas through plastics in the form of film, sheeting, laminates, coextrusions, or plastic-coated papers or fabrics. It provides for the determination of (1) oxygen gas transmission rate (OTR), (2) the permeance of the film to oxygen gas (PO2), and (3) oxygen permeability coefficient (P'O2) in the case of homogeneous materials.
  • OTR oxygen gas transmission rate
  • PO2 permeance of the film to oxygen gas
  • P'O2 oxygen permeability coefficient
  • T448 provides a test for the water vapor transmission rate of paper and paperboard at 23 Degree C and 50% RH.
  • T559 or the “Kit” test, describes a procedure for testing the degree of repellency and/or the antiwicking characteristics of paper or paperboard treated with fluorochemical sizing agents. Testing involves placing a series of numbered reagents (varying in surface tension and viscosity or “aggressiveness”) onto the surface of the sample. The solutions are numbered from 1 (the least aggressive) to 12 (the most aggressive). The highest numbered solution that does not stain the surface is reported as the “kit rating.”
  • DIN 14338 (or EN 14338) is a test for paper and board intended to come into contact with foodstuffs. This standard specifies a method to assess the transfer or migration of specific volatile and semivolatile substances from paper and board. This test method is developed for paper and board intended to come in contact with dry, non fatty foodstuffs and paper and board for baking purposes. The test provides the conditions for determination of migration from paper and board using modified polyphenylene oxide (MPPO), which may be known as Tenax®, as a food simulant.
  • MPPO modified polyphenylene oxide
  • ISO 535 (“Cobb” method) specifies a method of determining the water absorptiveness of sized paper and board, including corrugated fibreboard, under standard conditions.
  • Optical density is determined according to the formula:
  • OD Logio (Io/I) where Io is the incident optical intensity and I is the transmitted optical intensity. Therefore, Optical Density (OD) is measured on a logarithmic scale where:
  • the metalised translucent paper in the middle layer of the laminate constructions can be replaced by just a translucent paper without metallisation for applications that require a lower cost, lower light barrier and/or lower overall MVTR barrier and oxygen barrier.
  • a laminated packaging material including an outer layer comprising a barrier paper with a grammage of between 25gsm and 200gsm, a middle layer comprising a translucent tracing paper with gas barrier properties at a grammage of between 30gsm and lOOgsm and an inner layer comprising a barrier paper with a grammage of between 25gsm and 200gsm.
  • the material may be used to form a cup, container, box, lid, tray or tube, particularly for packaging food.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)
  • Packages (AREA)

Abstract

L'invention concerne un matériau d'emballage stratifié, le matériau comprenant une couche externe comprenant un papier barrière ayant un grammage compris entre 25 g/m2 et 200 g/m2, une couche intermédiaire comprenant un papier de traçage translucide ayant des propriétés de barrière aux gaz à un grammage compris entre 30 g/m2 et 100 g/m2 et une couche interne comprenant un papier barrière ayant un grammage compris entre 25 g/m2 et 200 g/m2. Le matériau peut être utilisé pour former une tasse, un récipient, une boîte, un couvercle, un plateau ou un tube, en particulier pour emballer des aliments.
PCT/GB2021/053230 2020-12-10 2021-12-09 Matériau d'emballage stratifié Ceased WO2022123257A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2019510.3 2020-12-10
GB2019510.3A GB2597553B (en) 2020-12-10 2020-12-10 Laminated Packaging Material

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WO2022123257A2 true WO2022123257A2 (fr) 2022-06-16
WO2022123257A3 WO2022123257A3 (fr) 2022-08-11

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SE545698C2 (en) * 2022-03-02 2023-12-12 Stora Enso Oyj A method for manufacturing a barrier layer for a paper or paperboard based packaging laminate
SE545699C2 (en) * 2022-03-02 2023-12-12 Stora Enso Oyj A method for manufacturing a paper or paperboard based packaging laminate
SE547118C2 (en) * 2023-09-05 2025-04-22 Stora Enso Oyj A method for manufacturing a paper or paperboard based packaging laminate

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JP2009035687A (ja) * 2007-08-03 2009-02-19 Du Pont Mitsui Polychem Co Ltd 紫外線吸収性能を有する成型体およびその用途
MX2012008547A (es) * 2010-01-23 2013-02-12 Huhtamaeki Oyj Un laminado inteligente y un contenedor inteligente del mismo.
GB2560825A (en) * 2017-03-20 2018-09-26 Havi Global Solutions Europe Ltd Food packaging
SE542108C2 (en) * 2017-12-28 2020-02-25 Stora Enso Oyj A paperboard for packaging of liquid and/or frozen food
GB2579107A (en) * 2019-04-26 2020-06-10 Havi Global Solutions Europe Ltd Barrier coated paper straw

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GB2597553B (en) 2023-04-12
GB2597553A (en) 2022-02-02
GB202019510D0 (en) 2021-01-27

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