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WO2016038254A1 - Stratifié d'emballage, emballage et procédé de production de stratifié d'emballage - Google Patents

Stratifié d'emballage, emballage et procédé de production de stratifié d'emballage Download PDF

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Publication number
WO2016038254A1
WO2016038254A1 PCT/FI2015/050596 FI2015050596W WO2016038254A1 WO 2016038254 A1 WO2016038254 A1 WO 2016038254A1 FI 2015050596 W FI2015050596 W FI 2015050596W WO 2016038254 A1 WO2016038254 A1 WO 2016038254A1
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WO
WIPO (PCT)
Prior art keywords
packaging laminate
layer
plastic film
film layer
tie
Prior art date
Application number
PCT/FI2015/050596
Other languages
English (en)
Inventor
Tero PEKKOLA
Viivi NUOTTAJÄRVI
Jari Huotarinen
Original Assignee
Lamican Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lamican Oy filed Critical Lamican Oy
Publication of WO2016038254A1 publication Critical patent/WO2016038254A1/fr

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Classifications

    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin 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
    • 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
    • B32B15/06—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 natural rubber or synthetic rubber
    • 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
    • B32B15/08—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 synthetic resin
    • 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
    • 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
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/14—Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • 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
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
    • B65D85/72—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for for edible or potable liquids, semiliquids, or plastic or pasty materials
    • 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
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582—Tearability
    • B32B2307/5825—Tear resistant
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/75—Printability
    • 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

Definitions

  • the application concerns packaging material structures and packages manufactured thereof. Further the application concerns a method for providing a packaging material.
  • Aseptic packaging In food industry a variety of packaging materials and containers for products to be packaged and to be stored are used. Generally the properties and the desired shelf life of the products determine the packaging materials and the methods to be used. An aseptic packaging is preferred for providing economical and safe packaging and storing of food products. Aseptic packaging allows storing of food products for long periods without preservatives. In aseptic packaging a sterile product is packaged into a sterile package in a sterile environment.
  • One embodiment provides a packaging laminate comprising multiple layers in the following order: a fiber-based substrate, a first tie-layer, a barrier layer, a second tie-layer, and a plastic film layer providing an interface with a product to be packaged, and wherein the plastic film layer comprises low density polyethylene and polyolefin plastomer, and wherein the plastic film layer has off odour and off flavour intensity level below 2 to the product to be packaged, when measured according to standard ISO 13302.
  • One embodiment provides use of a packaging laminate for providing a liquid container.
  • One embodiment provides a method for manufacturing a packaging laminate, the method comprising at least the following steps: providing a fiber-based substrate, providing a barrier layer, providing plastic film layer comprising low density polyethylene and polyolefin plastomer by extrusion process having a temperature of the polymer melt comprising low density polyethylene and polyolefin plastomer between 260 and 290 degrees C, applying a first tie- layer between the fiber-based substrate and the barrier layer, and applying a second tie-layer between the barrier layer and the plastic film layer so as to form the packaging laminate.
  • One embodiment provides a container comprising a body, a cover part and a bottom part, and wherein at least the body and the bottom part comprises a packaging laminate comprising multiple layers in the following order: a fiber- based substrate, a first tie-layer, a barrier layer, a second tie-layer, and a plastic film layer providing an interface with a product to be packaged, and wherein the plastic film layer comprises low density polyethylene and polyolefin plastomer, and wherein the plastic film layer has off odour and off flavour intensity level below 2 to the product to be packaged, when measured according to standard ISO 13302.
  • One embodiment provides use of a container including at least the body and the bottom part comprising a packaging laminate for aseptic packaging of pure water.
  • the plastic film layer of the packaging laminate has off flavour intensity level between 0.1 and 1 .5.
  • the plastic film layer of the packaging laminate has off odour intensity level between 0.1 and 1 .5.
  • the barrier layer of the packaging laminate is an aluminium foil.
  • the plastic film layer comprises between 50 and 70 wt.% of low density polyethylene and between 30 and 50 wt.% of polyolefin plastomer. According to an example the plastic film layer comprises between 50 and 70 wt.% of polyolefin plastomer and between 30 and 50 wt.% of low density polyethylene. According to an example the plastic film layer comprises between 55 and 65 wt.% of low density polyethylene and between 35 and 45 wt.% of polyolefin plastomer.
  • the plastic film layer comprises between 55 and 65 wt.% of polyolefin plastomer and between 35 and 45 wt.% of low density polyethylene.
  • the polyolefin plastomer is ethylene alpha-olefin resin.
  • Ethylene alpha-olefin resin may be copolymer of ethylene with higher alpha olefins such as butene, hexene or octene, such as ethylene 1 -octene copolymer.
  • the plastic film layer is manufactured by extrusion having a temperature of the polymer melt between 260 and 290 degrees C.
  • the total grammage of the packaging laminate is between 250 and 450 gsm.
  • the plastic film layer has the grammage between 40 and 90 gsm.
  • the substrate has the grammage between 90 and 300 gsm.
  • the second tie-layer consists mainly of thermoplastic zinc ionomer resin.
  • the cover part of the container comprises the packaging laminate.
  • Fig. 1 shows an example embodiment of a liquid packaging container
  • Fig. 2 shows, in a cross-sectional view, an example embodiment of a packaging laminate
  • Fig. 3 shows, in a cross-sectional view, an example embodiment of a body of the packaging container formed from a packaging laminate.
  • laminate refers to a multilayer structure comprising at least two material layers laminated together.
  • a laminate may comprise a substrate material, which includes at least one surface laminated with additional layer(s).
  • the multiple layers may be laminated together with a tie-layer layer between the layers. Tie-layer is able to provide suitable adhesion between the layers.
  • Overlying/underlying refers to an arrangement of a layer in relation to another layer. Overlaying/underlying refers to an arrangement, where a layer partially or completely overlies/underlies another layer. The overlying/underlying layers are not necessarily in contact with each other, but one or more additional layers may be arranged between the overlying layers.
  • Adjacent refers to an arrangement, where a layer is next to another layer. Adjacent layers are in contact with each other and no additional layers are between the layers.
  • Outer surface of a package such as a liquid container refers to a surface that forms an exterior part of the package, usually comprising printing. Accordingly, inner surface of the package forms an interior part of the package 1 .
  • Topmost (outermost, uppermost, upmost) layer refers to a configuration of a packaging laminate structure, where the topmost layer forms upper (outside) part of the packaging laminate structure arranged opposite to an undermost layer. Undermost layer of the laminate will be in contact with the product to be packaged into the container formed from the packaging laminate and thus forms an interior part of the package 1 , such as a liquid container. Thus undermost layer of the packaging laminate provides an interface with a product to be packaged.
  • Term “product contact layer” refers to the inner layer of the packaging laminate which will be in contact with the product packaged into the container formed from the packaging laminate. Product contact layer is the innermost layer of the container. Product contact layer provides an interface of a product to be packaged.
  • a package 1 may be a cylindrical can-like package comprising a cylindrical tube-like body 2 and end members, a cover part (lid) 3 and a bottom part 4, connected to the upper and lower open ends of the body for closing the package.
  • the body 2 may also have a cross-section other than a circle.
  • the cover part includes a hole covered with an openable closure.
  • a package such as a liquid container, may be rectangle, pouch-like, cone-like in longitudinal section or truncated cone-like.
  • a container may also be referred to as a package.
  • the body 2 of the container may be formed by wrapping the body around itself and seaming the leading 15 and trailing 16 edges.
  • a seam 14 may be heat-sealed.
  • Forming and sealing the container have been disclosed e.g. an earlier patent publication EP 1091874.
  • a liquid container may be a sales package that has been filled and closed or an unfilled and unclosed sales package.
  • Containers may be used for the aseptic and airtight packaging of liquid foodstuffs, such as beverages.
  • the container may be used for packaging of liquid-like foodstuff, which is flowable enough for packing by pouring.
  • At least one of the following parts of the container includes a packaging laminate 5.
  • the bottom part and the body consists of the packaging laminate. More preferably, all the parts of the container comprise the packaging laminate.
  • a container comprising a packaging laminate according to the application is suitable for disposable packaging of, for example, water, milk products, fruit juices, ice coffee, ice tea and wine.
  • a packaging laminate according to the application is especially suitable for aseptic packaging of pure water. Pure water refers in this application to fresh water and food safety water suitable for drinking and food processing. Pure water may be natural water, spring water, mineral water or sparkling (carbonated) water.
  • a packaging laminate 5 comprises a fiber-based substrate material 6, such as board-based substrate material also referred to as carton.
  • the packaging laminate may comprise at least 30 wt.% or at least 40 wt.% fiber-based materials.
  • An amount of fiber-based material of the laminate may be between 30 and 80 wt.% or between 40 and 80 wt.%.
  • a fiber-based substrate material 6 of a packaging laminate comprises an outer surface 7 and an inner surface 8 opposite the outer surface. At least the inner surface 8 of the substrate material 6 is coated with additional layers in order to form a packaging laminate structure.
  • a packaging laminate includes a board-based substrate 6 and a barrier layer 10 attached onto the inner surface 8 of the substrate.
  • the barrier layer provides barrier to at least one of the following: foreign substances, oxygen, aroma and visible light.
  • Foreign substances may include e.g. viruses, bacteria and fungi.
  • Barrier layer may be metal foil such as aluminium foil.
  • the packaging laminate further includes a plastic film layer 12 underlying the barrier layer forming a product contact layer (innermost layer).
  • a plastic film layer provides an interface with a product to be packaged.
  • a plastic film layer provides effect of heat-sealing capability of the packaging laminate.
  • the plastic film layer may further provide an effect of protecting aluminium from the corroding effects of packaged products e.g. acidic liquid.
  • Different layers of the packaging laminate 5 are joined to one another through binder layers also referred to as tie-layers.
  • the packaging laminate comprises a first tie-layer 9.
  • the packaging laminate comprises a second tie layer 1 1 .
  • the first tie-layer 9 is between the substrate 6 and the barrier layer 10.
  • the second tie-layer 1 1 is between the barrier layer 10 and the plastic film layer 12.
  • the second tie-layer is underlying the first tie-layer.
  • the previously presented layers of the packaging laminate 5 are in the following order and adjacent to each other: a fiber-based substrate, 6 a first tie-layer 9, a barrier layer 10, a second tie-layer 1 1 , and a plastic film layer 12 providing an interface with a product to be packaged.
  • the packaging laminate 5 may further include additional layer(s) attached onto the outer surface 7 of the fiber-based substrate 6.
  • the outer surface 7 may include, for example, polymer layer(s), paper layers(s), print layer(s) or adhesive label(s). External polymer layer may have effect of providing moisture barrier improving the durability of the packaging container produced thereof.
  • a substrate 6 of the packaging laminate may be fiber-based.
  • the grammage of the fiber-based substrate of the packaging laminate, such as board, is at least 90 gsm, preferably at least 100 gsm or at least 300 gsm.
  • the grammage of fiber-based substrate of the packaging laminate is between 90 and 300 gsm or between 150 and 300 gsm.
  • the grammage of fiber-based substrate of the packaging laminate used as a bottom for the container is between 90 and 300 gsm or between 150 and 300 gsm.
  • the grammage of the fiber-based substrate of the bottom part is 190 gsm.
  • the grammage of the fiber-based substrate of the laminate used for the body of the container is between 150 and 300 gsm or between 200 and 260 gsm. In an example, the grammage of the fiber-based substrate of the body is 230 gsm. In an example, the grammage of the fiber- based substrate of the cover part is 210 gsm.
  • a barrier layer 10 is used, for example, as oxygen and/or aroma barrier.
  • the barrier layer may be polymer based barrier or metal foil, such as aluminium foil. Thickness of the barrier layer may be between 5 and 50 microns. In an example, the thickness of the aluminium foil of the bottom part of the container is between 20 and 50 microns, for example 40 microns. In an example, the thickness of the aluminium foil of the body part of the container is between 2 and 10 microns, for example 7 microns. Thickness of the aluminium foil has effect on providing efficient manufacturing process of the liquid container. Thickness between 20 and 50 microns may provide improved tearing resistance.
  • the grammage of the barrier layer of the laminate used as a bottom for the container is between 80 and 120 gsm, preferably between 90 and 1 10 gsm. For example 103 gsm.
  • the grammage of the barrier layer of the laminate used for the body of the container is between 10 and 30 gsm, preferably between 15 and 20 gsm. For example18 gsm.
  • Tie-layer layer(s) 9,1 1 are used for providing adhesion between different layers of the multilayer structure so as to form a packaging laminate.
  • Tie- layer may comprise or consist of lamination polymer, such as low density polyethylene (LDPE) or thermoplastic resin.
  • Packaging laminate structures such as a body and end members of a container, may have at least two tie- layers.
  • a first tie-layer is between a substrate layer 6 and a barrier layer 10.
  • a second tie-layer may be between the barrier layer 10 and a plastic film layer 12.
  • the laminate includes two different tie- layers between a substrate layer and a barrier layer and further a tie-layer between the barrier layer and a plastic film layer.
  • tie-layer consists of low density polyethylene having density of 923 kg/m 3 and melt flow rate (190 degrees C, 2.16 kg) of 4.5 g/10 min, when measured according to standards ISO 1 183 and ISO 1 133, correspondingly.
  • Melting temperature of low density polyethylene may be 109 degrees C, when measured using DSC and standard ISO 1 1357-3.
  • the grammage of a tie-layer consisting of LDPE may be between 2 and 20 gsm, preferably between 10 and 20 gsm, for example 15 gsm or 10 gsm.
  • tie-layer comprises or consists of thermoplastic zinc ionomer resin.
  • Thermoplastic zinc ionomer resin may be ethylene/methacrylic acid copolymer.
  • Thermoplastic zinc ionomer resin may be for example Surlyn® 1652 from DuPont.
  • tie-layer consists of thermoplastic zinc ionomer resin having density of 940 kg/m 3 and melt flow rate (190 degrees C, 2.16 kg) of 5.2 g/10 min, when measured according to standards ISO 1 183 and ISO 1 133, correspondingly.
  • Melting temperature may be 100 degrees C and freezing point 80 degrees C, when measured according to standard ISO 3146.
  • Vicat Softening point may be 79 degrees C, when measured according to standard ISO 306.
  • the grammage of the tie- layer may be between 2 and 10 gsm, preferably between 4 and 8 gsm, for example 5 gsm or 10 gsm.
  • a first tie-layer 9 of a packaging laminate is based on low density polyethylene.
  • the first tie-layer may consist of low density polyethylene having density of 923 kg/m 3 and melt flow rate (190 degrees C, 2.16 kg) of 4.5 g/10 min when measured according to standard ISO 1 183. Melting temperature may be 109 degrees C when measured using DSC and standard ISO 1 1357-3.
  • the grammage of the first tie-layer is between 5 and 20 gsm, preferably between 10 and 18 gsm, for example 15 gsm or 10 gsm.
  • the second tie-layer 1 1 of a packaging laminate is based on thermoplastic zinc ionomer resin.
  • the second tie-layer may consist of thermoplastic zinc ionomer having density of 940 kg/m 3 and melt flow rate (190 degrees C, 2.16 kg) of 5.2 g/10 min, when measured according to standards ISO 1 183 and ISO 1 133, correspondingly.
  • Melting temperature may be 100 degrees C and freezing point 80 degrees C, when measured according to standard ISO 3146.
  • Vicat softening point may be 79 degrees C, when measured according to standard ISO 306.
  • the grammage of the second tie-layer is between 2 and 10 gsm, preferably between 4 and 8 gsm, for example 5 gsm or 10 gsm.
  • a plastic film layer 12 of a packaging laminate comprises or consists of polyolefin polymer(s).
  • the plastic film layer is mainly composed of polyethylene(s).
  • Polyethylene(s) may include homopolymer(s) and/or copolymers of ethylene.
  • the plastic film layer may comprise different grades of polyethylene (PE).
  • PE polyethylene
  • the plastic film layer includes low density polyethylene (LDPE) and polyolefin plastomer.
  • the plastic film includes low density polyethylene and linear low density polyethylene (LLDPE).
  • POP Polyolefin plastomer is a polymer that softens when heated and hardens when cooled, yet remaining flexible.
  • Polyolefin plastomer(s) include copolymer(s) of ethylene and alpha-olefin.
  • Polyolefin plastomers may be produced via single-site constrained geometry catalyst technology so as to provide polymer chains with greater uniformity in length (narrow molecular weight distribution) and in co-monomer incorporation.
  • Low density polyethylene may be a homopolymer consisting of ethylene monomers.
  • LDPE may have density of 923 kg/m 3 and melt flow rate (190 degrees C, 2.16 kg) of 4.5 g/10 min, when measured according to standards ISO 1 183 and ISO 1 133, correspondingly.
  • Melting temperature may be 109 degrees C, when measured using DSC and according to standard ISO 1 1357-3.
  • LDPE may be CA7230 from Borealis.
  • Polyolefin plastomer may be ethylene alpha-olefin resin, for example copolymer of ethylene with higher alpha olefins such as butene, hexene or octene.
  • Polyolefin plastomer may be ethylene 1 -octene copolymer.
  • a plastic film layer 12 contains between 50 and 70 wt.%, preferably between 55 and 65, for example 60 wt.% polyolefin plastomer.
  • a plastic film contains between 50 and 70 wt.%, preferably between 55 and 65, for example 60 wt.% linear low density polyethylene (LLDPE).
  • Polyolefin plastomer may be polyethylene based copolymer, such as ethylene 1 -octene copolymer.
  • polyolefin plastomer may be ethylene alpha-olefin resin, such as AffinityTM PT1451 G1 from Dow.
  • Polyolefin plastomer such as ethylene alpha-olefin resin, may have density of 902 kg/m 3 and melt flow rate (190 degrees C, 2.16 kg) of 7.5 g/10 min, when measured according to standards ASTM D-792 and ISO 1 133, correspondingly. Melting point may be 98 degrees C, when measured using DSC. Vicat softening point may be 79 degrees C, when measured according to standard ASTM D-1525.
  • the plastic film layer 12 further contains between 30 and 50 wt.%, preferably between 35 and 45, for example 40 wt.% low density polyethylene (LDPE).
  • LDPE low density polyethylene
  • LDPE may have density of 923 kg/m 3 and melt flow rate (190 degrees C, 2.16 kg) of 4.5 g/10 min, when measured according to standards ISO 1 183 and ISO 1 133, correspondingly.
  • Melting temperature may be 109 degrees C, when measured using DSC and according to standard ISO 1 1357-3.
  • LDPE may be CA7230 from Borealis.
  • the grammage of the plastic film layer is between 20 and 100 gsm, preferably between 40 and 90 gsm, for example 50 gsm, 40 gsm or 30 gsm.
  • the grammage of the plastic film layer may have effect on heat sealing capability of the laminate.
  • the grammage of the plastic film layer may have also effect on providing high quality liquid containers e.g. tight seams ensuring aseptic packaging.
  • the total grammage of the packaging laminate which comprises the following layers: substrate 6, barrier layer 10, first tie-layer 9, second tie-layer 1 1 , and plastic film layer 12 is between 250 and 450 gsm, preferably between 280 to 440 gsm, or between 300 and 440 gsm.
  • Manufacturing a packaging laminate 5 may comprise at least the following steps:
  • the method may further comprise surface treating the plastic film layer using at least one of the following: flame treatment, corona-discharge treatment, and plasma treatment prior to lamination.
  • the surface treatment includes corona and/or ozone treatment.
  • Surface treatment may have effect on adhesion between the plastic film layer and the tie-layer.
  • Surface treatment may increase the adhesion between the layers.
  • Forming of the plastic film layer 12 may be provided by extrusion e.g. by using twin screw extruder.
  • Temperature of the polymer melt consisting of a blend of polymeric raw materials of low density polyethylene and polyolefin plastomer may be below 320 degrees C, preferably below 300 degrees C during extrusion.
  • Temperature may be, for example between 250 and 300 degrees C, preferably between 260 and 290 degrees C or between 270 and 285 degrees.
  • the temperature of the polymer melt comprising low density polyethylene and polyolefin plastomer is 278 degrees C.
  • Temperature of the polymer melt between 260 and 290 degrees C, or between 270 and 285 degrees C in extrusion may provide an effect of improved heat-sealing capability of the plastic film layer.
  • Specific plastic film layer processing temperature may also have effect on intensity of off odour and off flavor of the packaging laminate.
  • a plastic film layer processing temperature may also have effect on reducing an amount of carboxyl groups of the plastic film layer. It may also have effect on providing reduced level of oxidation of the plastic film layer.
  • a packaging product such as a liquid container, comprises a packaging laminate 5.
  • a body 2, a cover part 3 and a bottom part 4 includes the packaging laminate 5.
  • At least the body comprises the packaging laminate.
  • Preferably at least the body and the bottom part includes a packaging laminate. All parts of the liquid container may comprise same kind of packaging laminate material. Alternatively parts of the liquid container may comprise different packaging laminate material. According to an example all parts of the container: the body and the end members (bottom part and cover part) contain packaging laminate comprising the following layers: a substrate 6, a barrier layer 10, a first tie-layer 9, a second tie-layer 1 1 , and a plastic film layer 12.
  • Grammage of the packaging laminate is, for example, between 250 and 450 gsm, preferably between 280 to 420 gsm, or between 300 and 400 gsm.
  • a packaging laminate for the body of the container comprises layers in the following order: a substrate 6, a first tie-layer 9, a barrier layer 10, a second tie-layer 1 1 , and a plastic film layer 12.
  • the plastic film layer 12 is the undermost layer of the laminate forming the product contact layer 13 of the container 1 .
  • the grammage of the packaging laminate may be between 250 and 350 gsm, or between 300 and 350 gsm.
  • the body of the container may further comprise additional layers on the outer substrate surface 7, i.e. on the exterior side of the container, such as paper suitable for printing. Total grammage of the body may be between 350 and 450 gsm, or between 390 and 430 gsm. Total thickness of the body may be between 480 and 540 microns.
  • a packaging laminate for the bottom of the container comprises layers in the following order: a substrate 6, a first tie-layer 9, a barrier layer 10, a second tie-layer 1 1 , and a plastic film layer 12.
  • the plastic film layer 12 is the undermost layer of the laminate forming the product contact layer 13 of the container 1 .
  • the grammage of the packaging laminate may be between 340 and 420 gsm. Thickness of the bottom may be between 370 and 420 microns.
  • a packaging laminate for the cover of the container comprises layers in the following order: a substrate 6, a first tie-layer 9, a barrier layer 10, a second tie-layer 1 1 , and a plastic film layer 12.
  • the plastic film layer 12 is the undermost layer of the laminate forming the product contact layer 13 of the container 1 .
  • the grammage of the packaging laminate may be between 260 and 320 gsm.
  • Total grammage of the cover may be between 350 and 450 gsm, or between 380 and 440 gsm.
  • Thickness of the cover may be between 440 and 510 microns.
  • a manufacturing of a container includes at least the following steps: forming a packaging laminate, cutting the packaging laminate into predetermined shapes suitable for a body 2 and end members 3,4, and sealing the cut shapes so as to provide a container 1 .
  • the body and the end members may be manufactured from the same packaging laminate material. Alternatively, they may be made from different packaging laminate materials. For example, at least one of the end members may be made of different packaging laminate material.
  • a sheet having a specific size for the body is cut from the packaging laminate.
  • the sheet is wrapped around a wrapping mandrel providing a shape of the body determined by the outer shell of the mandrel.
  • One of the vertical edges of the sheet may be folded to ensure providing an aseptic package.
  • a leading edge 15 may be folded as shown in a Fig. 3. Periphery of the folded leading edge 15 may have feather edge in order to reduce the thickness of the seam 14.
  • Sealing may be provided by means of heating or otherwise energy treating to bring the sheet to a sealing state and pressing the overlapping edges together so as to form a seam 14. Heating may be provided prior to or during pressing. Energy may be exerted on the plastic film layer 12 of the laminate, which brings it into a sealing state. Sealing may be provided by heat-sealing machine having temperature between 250 and 290 degrees C, for example between 260 and 280 degrees C. Alternatively, heat may be provided by blowing having a blow temperature, for example, between 300 and 450 degrees C, or between 320 and 400 degrees C prior to pressing.
  • metal foil layer of the laminate may be heated by induction which further heats the plastic film layer 12 in the seam area. Heating focused to the area of overlapping leading and trailing edges of the sheet provides melting of the plastic film layer 12 so as to provide a tight seam.
  • the manufacturing further includes attaching a first end member corresponding in outline to the shape of the end of the body part.
  • the first end member is preferably a cover part (lid) 3. Outer edges of the end member are folded upwards and pressed against the inner layer of the body.
  • the manufacturing may further include clenching, wherein the edge portion of the body is folded over the upwardly folded end member so as to provide a seam for the end member and body.
  • a second end member is applied after filling the container in order to close the container.
  • the second end member is preferably a bottom part 4.
  • Manufacturing and filling of the container have effect on avoiding contact between the filled product and the seam in a sealing state. If there exists a contact between the filled product and the seam which is in a sealing state i.e. in molten state off-flavour and/or off-odour may be transferred to the product.
  • a method for manufacturing a container has effect on minimizing access of foreign substances and microorganisms into the package.
  • a container manufactured from the packaging laminate can be cold filled with a flowable product suitable for pouring. Filled containers can be stored at either ambient temperatures or refrigerated conditions.
  • a closed container comprising a body and end members connected to the open ends of the body provides liquid and gas tight container.
  • At least some/all embodiments have effect on providing impermeable, aseptic package. At least some/all embodiments have effect on extended shelf life of the packaged product such as water and milk based product.
  • plastic film layer 12 comprising polyolefin polymers and manufactured with using temperatures of the melted polymer below 300 degrees C, for example between 250 and 285 degrees C, may increase the heat-sealing capability of the packaging laminate thus improving tightness of the seam.
  • At least some/all embodiments provide environmentally friendly packaging laminate and container produced thereof.
  • Packaging laminate and packaging container can be, for example, recycled and/or burnt after usage.
  • At least some/all embodiments provide effect of reduced taste level to the packaged product.
  • At least some/all embodiments provide effect of reduced odour level to the packaged product.
  • a packaging laminate has off odour and off flavour intensity level below 2 to the product to be packaged.
  • intensity level of off-flavour and off-odour of the product is weak. Weak intensity level refers to intensity scale between 0 and 1 when measured according to ISO 13302 standard.
  • At least the inner laminate surface, which is in direct contact with the contents of the container has effect on the taste level of the packaged product.
  • the inner laminate surface may also have effect on the odour level of the packaged product. Due to the low taste level and odour level of container used for packaging of pure water, such as spring water, abnormal smell and flavour of the water can be avoided.
  • the plastic film layer 12 of the packaging laminate may have reduced amount of ingredients eluting into the packaged contents. Thus, a plastic film layer of the packaging laminate may provide less off-flavour and/or off odour to the contents of the container.
  • At least some/all embodiments of a packaging laminate has weak intensity equal or below 1 .5 of off odour and off flavour to the packaged product, when measured according to standard ISO 13302 Sensory analysis - Method for assessing modifications to the flavor of foodstuff due to the packaging.
  • the plastic film layer 12 has off odour and off flavour intensity level below 2 to the product to be packaged, when measured according to standard ISO 13302.
  • the plastic film layer has off flavour intensity level between 0.1 and 1 .5 or between 0.5 and 1 .5.
  • the plastic film layer has off odour intensity level between 0.1 and 1 .5 or between 0.2 and 1 .5.
  • Samples contained water packed into containers comprising packaging laminate having a plastic film layer 12, as disclosed in previous and comprising between 30 and 50 wt.% of low density polyethylene and between 50 and 70 wt.% of polyolefin plastomer and manufactured having a temperature of the polymer melt between 260 and 290 °C, as a product contact layer 13.
  • Reference samples contained water packaged in PET bottles comprising PET as a product contact layer. Sample water and the reference water came from same process with same conditions and were packed at same time. Evaluation was executed by the sensory evaluation panel, which has accreditations with methods EN 1230-2:2010 transfer of off- flavor from materials in contact with food and SFS-2335 A - Odor and Off- flavor transferred from plastic pipes to household water.
  • Test conditions of the samples and reference samples were as follows: 10 days storing at 40 degrees C simulating long term storing at room temperature according to EU 10/201 1 ; tempering the samples in ambient conditions and preparing for sensory evaluation. Two parallel series of three samples were served. Series contained one sample of water packed into container comprising packaging laminate and two reference samples. Panelists (ten member panel) needed to pick up one odd sample in each series.
  • the off-flavour intensity of odd sample was evaluated with scale 0-3. 0 referring to no off-odour or off-flavour, 1 referring to weak off-odour or off- flavour, 2 referring to clear off-odour or off-flavour and 3 referring to strong off-odour or off-flavour. In a course no. 1 odd sample was detected by 2/10 having intensity of off- odour 0.2 and by 3/10 having intensity of off-flavor 0.6.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)

Abstract

La présente invention concerne un stratifié d'emballage multicouche. Selon un mode de réalisation, le stratifié d'emballage multicouche comprend un substrat à base de fibres, une couche barrière, des couches de liaison et une couche de film plastique assurant une interface avec un produit à emballer et comprenant du polyéthylène basse densité et du plastomère polyoléfinique et présentant un niveau d'intensité d'odeur atypique et de flaveur atypique inférieur à 2 pour le produit à emballer. L'invention concerne en outre un procédé de production d'un stratifié d'emballage, l'utilisation dudit stratifié d'emballage pour un récipient de liquide, et l'utilisation d'un récipient pour le conditionnement d'eau pure.
PCT/FI2015/050596 2014-09-11 2015-09-11 Stratifié d'emballage, emballage et procédé de production de stratifié d'emballage WO2016038254A1 (fr)

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FI20145794A FI20145794A7 (fi) 2014-09-11 2014-09-11 Pakkauslaminaatti, pakkaus ja menetelmä pakkauslaminaatin valmistamiseksi
FI20145794 2014-09-11

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998026994A1 (fr) * 1996-12-19 1998-06-25 Tetra Laval Holdings & Finance S.A. Lamine d'emballage, son procede de fabrication et conteneurs d'emballage
WO2003095199A1 (fr) * 2002-05-07 2003-11-20 Tetra Laval Holdings & Finance S.A. Stratifie d'emballage, son procede de fabrication et recipient d'emballage fabrique a partir dudit stratifie d'emballage
JP2011020705A (ja) * 2009-07-15 2011-02-03 Dainippon Printing Co Ltd 液体用紙容器
US20120156478A1 (en) * 2009-07-09 2012-06-21 Alternapak Holding B.V. Laminated packaging material for a container

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998026994A1 (fr) * 1996-12-19 1998-06-25 Tetra Laval Holdings & Finance S.A. Lamine d'emballage, son procede de fabrication et conteneurs d'emballage
WO2003095199A1 (fr) * 2002-05-07 2003-11-20 Tetra Laval Holdings & Finance S.A. Stratifie d'emballage, son procede de fabrication et recipient d'emballage fabrique a partir dudit stratifie d'emballage
US20120156478A1 (en) * 2009-07-09 2012-06-21 Alternapak Holding B.V. Laminated packaging material for a container
JP2011020705A (ja) * 2009-07-15 2011-02-03 Dainippon Printing Co Ltd 液体用紙容器

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