Oxygen Barrier Adhesives for F&B Packaging

A laminated sheet material for food containers that combines a paper substrate, a metal or metal oxide layer, and a gas barrier layer comprising a polymer. The metal layer is in direct contact with the paper substrate, which has been surface-modified to improve adhesion. The gas barrier layer is preferably an ethylene vinyl alcohol copolymer (EVOH) applied by extrusion coating, and may be biobased. The laminated sheet material provides improved mechanical strength, chemical resistance, and barrier properties compared to conventional laminates.

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Reducing oxygen degradation of liquids contained in sealed containers by using a combination container with an inner container that has oxygen permeability and an outer container with an oxygen barrier. The inner container with oxygen permeability contains the liquid and is sealed by a stopper. An oxygen absorber is placed between the inner container and the outer container to absorb oxygen. The outer container with the oxygen absorber prevents external oxygen from reaching the inner container. This provides a sealed environment with reduced oxygen levels to prolong the shelf life of the contained liquid.

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Laminate for paper containers that prevents bubble formation during assembly while maintaining high adhesive strength between layers. The laminate comprises a thermoplastic resin layer, an adhesive layer, and a barrier layer, with the adhesive layer containing a resin composition that includes an ethylene/unsaturated carboxylic acid/unsaturated carboxylic acid ester copolymer. The adhesive layer has a melt flow rate of 190°C and a load of 2160 g at 9.0 g/10 min or less, as specified by JIS K7210: 1999. This composition enables effective adhesion between the adhesive layer and barrier layer while preventing bubble formation during assembly.

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A multilayer film for packaging applications that combines the benefits of high-performance polyester resins with oxygen barrier properties. The film comprises a polyester resin layer with diol and dicarboxylic acid residues, followed by a vinyl alcohol-based copolymerized resin layer that provides enhanced barrier properties. The multilayer design enables superior oxygen barrier performance while maintaining mechanical strength, transparency, and recyclability of the polyester resin.

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A multilayer polymer foam film for aseptic packaging applications, comprising a foam layer with at least 10% closed cells, sandwiched between two HDPE skin layers and an EVOH barrier layer. The film exhibits improved oxygen barrier properties and resistance to physical damage during processing, enabling its use as a direct replacement for paperboard packaging.

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Multilayer body with enhanced gas barrier properties and adhesion, particularly in packaging applications, achieved through a novel multilayer structure. The body comprises a base layer with a metal oxide inorganic layer, followed by a resin layer with a low glass transition temperature, and a water-soluble polymer layer. This multilayer design ensures excellent adhesion between layers while maintaining high gas barrier properties through the metal oxide layer. The base layer provides mechanical integrity, the resin layer provides barrier properties, and the water-soluble polymer enhances adhesion.

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An ethylene-vinyl alcohol copolymer resin composition that exhibits improved gas barrier properties in high humidity environments. The composition comprises an ethylene-vinyl alcohol copolymer (EVOH) and a metal compound, with the EVOH having a specific ethylene content and melt flow rate. The metal compound is dispersed within the EVOH, and when the composition is exposed to high humidity, the metal compound interacts with the EVOH to enhance its gas barrier properties.

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Transparent dual-protection high barrier film for food packaging that provides excellent oxygen and moisture barrier properties while allowing identification of the contents. The film is made of layers: a main barrier layer of ethylene-based resin, an oxygen barrier layer, and two tie layers to bond the barrier and oxygen layers to the outer layers. This three-layer structure provides dual protection against oxygen and moisture. The transparent ethylene barrier layer blocks moisture, and the oxygen barrier layer blocks oxygen. The tie layers bond the layers together. The ethylene barrier layer is made of a resin like ethylene vinyl alcohol (EVOH) with ethylene content between 29-44 mol%. The tie layers are made of a tie resin like ionomer. The film can be made by coextrusion. It is used in packaging laminates that replace aluminum foil in high barrier applications.

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A polyethylene composition for barrier applications, comprising a blend of two ethylene copolymers with distinct properties. The first copolymer has a low melt index, narrow molecular weight distribution, and low density, while the second copolymer has a higher melt index, narrower molecular weight distribution, and higher density. The blend exhibits improved barrier properties, high load melt index, and a unique molecular weight distribution profile. The composition is prepared using a dual reactor solution polymerization process with single-site catalysts.

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Multilayer barrier film with high oxygen barrier and transparency for packaging applications. The film has alternating layers of an aliphatic polyester resin and a butenediol vinyl alcohol copolymer or an ethylene vinyl alcohol resin. This structure provides low oxygen permeability for packaging while maintaining transparency. The film is made by alternately extruding and laminating the resins, then stretching and heat-setting. The film has oxygen permeability less than 30 cc/m2·atm·day and can be used for packaging prone to oxygen degradation.

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Packaging is a major topic in its own right. In this chapter, we examine general guidelines and packaging options for proper in-home storage of dried food products. Vacuum sealing is presented as a convenient and economical way to package dried materials. The use of oxygen and moisture absorbers is revisited. The importance of having effective barriers to oxygen and moisture transmission through the packaging is discussed. Sources of regulations regarding commercial food packaging are provided for those who wish to sell their dried products.

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Recyclable paper-based packaging material with high barrier properties against moisture and oxygen. The material has a multilayer structure that includes a paper layer, a thin metallization layer, a binder layer, and a thick barrier layer of pure PVDC. The PVDC provides excellent oxygen barrier and heat sealability without modifying its properties by additives. The intermediate binder layer enhances adhesion between the metallization and PVDC layers. The paper layer provides mechanical robustness. The recyclable packaging material has barrier properties comparable to plastic packaging while avoiding the issues of incompatibility with paper recycling processes.

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Gas barrier laminate for packaging that combines paper's dead-fold properties with high water vapor barrier performance after folding, while reducing plastic usage. The laminate structure consists of a paper substrate, an anchor coat with polyvinyl alcohol or polarized polyolefin, a vapor deposition layer, an adhesive layer, and a sealant layer. This allows the paper to fold without creasing and maintain barrier properties, reducing plastic compared to fully plastic laminates.

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Laminated packaging material for pouch containers of liquid, semi-liquid, and viscous food products that provides improved barrier properties and package integrity compared to conventional carton packaging. The material has a cellulose-based bulk layer, a barrier layer between the bulk and inner layer, and an inner polyethylene film. The polyethylene film has specific properties like thickness, composition, and orientation to balance strength and openability. The barrier layer can be a metal foil or coated paper. The inner film improves barrier and sealing while reducing foil use. The layered structure provides good barrier, strength, and sealing properties for pouch packaging of sensitive foods.

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Biodegradable polymers have become a topic of great scientific and industrial interest due to their environmentally friendly nature. For the benefit of the market economy and environment, biodegradable materials should play a more critical role in packaging materials, which currently account for more than 50% of plastic products. However, various challenges remain for biodegradable polymers for practical packaging applications. Particularly pertaining to the poor oxygen/moisture barrier issues, which greatly limit the application of current biodegradable polymers in food packaging. In this review, various strategies for barrier property improvement are summarized, such as chain architecture and crystallinity tailoring, melt blending, multi-layer co-extrusion, surface coating, and nanotechnology. These strategies have also been considered effective ways for overcoming the poor oxygen or water vapor barrier properties of representative biodegradable polymers in mainstream research.

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Co-extruded multilayer polymeric films for packaging flowable products like beverages that provide improved toughness, barrier properties, and recyclability compared to existing films. The films have a unique composition with a small amount of high barrier EVOH core sandwiched between inner and outer sealant layers. The EVOH core has low weight fraction and thickness, around 0.1-5% of the total film. The rest of the layers are ethylene/alpha-olefin copolymers. This balance allows good barrier, toughness, and recyclability for flexible bags filled with flowable products.

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The integrity of a package must be maintained by a material that can be heat sealed, particularly in medical, food, and pharmaceutical packaging applications. Obtaining an appropriate heat seal in packaging is crucial since, compared to package failure, heat seal failure is a more common reason for product degradation. Material selection and packaging methods should be evaluated carefully to choose the proper material that can effectively function under proper conditions. Hermetic seal property ensures the effectiveness of barrier layers in preventing oxygen permeation, loss of odor, and transmission of water vapor. Polylactic acid (PLA) is one of the biodegradable polymers with the greatest potential for heat sealing and thermal processing. To establish manufacturing protocols, verify seal effectiveness, and ensure product integrity, it is essential to consider the effects of controlling process parameters during package design. Therefore, to undercover the role of PLA structure on its properties, the factors impacting its heat-sealing feature are elaborated on in this chapter. More... Read More

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Oxygen-absorbing film for packaging that combines high oxygen barrier properties, non-sorption of aroma components, and excellent tearability. The film comprises a surface substrate layer with oxygen barrier properties, an oxygen-absorbing resin layer containing a specific polyester-based resin, and an inner surface substrate layer containing a stretched PET substrate. The oxygen-absorbing resin layer is formulated with a specific isocyanate-based curing agent to achieve optimal oxygen absorption performance while maintaining heat seal strength and laminate integrity.

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Oxygen-absorbing compound for packaging applications, comprising a five-membered ring with an electron-donating organic group bonded to it. The compound is used in an oxygen-absorbing adhesive composition and coating composition that exhibit excellent oxygen absorption properties while generating minimal odor. The adhesive composition is suitable for forming an adhesive layer in laminates for packaging materials, while the coating composition is used to form a coating layer on the surface of packaging materials.

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Gas barrier film and packaging material with improved oxygen barrier properties and adhesion. The gas barrier film contains a resin with a carboxyl group-containing polymer and a resin with a dehydration condensation compound like phosphoric, sulfuric, or nitric acid. This provides better barrier performance compared to conventional films. The dehydration condensation compound promotes adhesion between the resins. An adjacent layer with compounds like aluminum oxide, silicon oxide, or silicon nitride further enhances barrier properties. The film can be used as a substrate in laminates and packaging materials.

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Oxygen scavengers are used to reduce the oxygen permeation of packaging (active barrier) and to absorb oxygen from its direct environment, e.g., a headspace of packaged food. Few oxygen scavenger coatings have been developed. Therefore, in this study, a novel oxygen scavenger coating has been developed. It is based on inorganicorganic polymers (ORMOCER). The oxygen absorption reaction is activated by UV light. The scavenger was synthesized, coated on aluminum foil, subsequently dried and afterwards laminated with a polyethylene sealing layer. UV light activates the oxygen scavenging reaction. The oxygen absorption capacity, measured at 23 C and 0% r.h., was 242 8 mg oxygen/g scavenger coating. When the oxygen scavenger coating layer was laminated by using a two-component polyurethane laminating adhesive, the absorption capacity was hardly reduced, with a measured absorption capacity of 223 18 mg oxygen/g scavenger coating. In an experimental packaging sample with the oxygen scavenger coating with a thickness (dry) of 3 m and 18 m, near-zero mbar oxygen partial pressure was r... Read More

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The aim of this research was to produce an innovative, biodegradable multilayer active packaging solution, with excellent oxygen barrier properties, to extend shelf- life of oily foods. In fact, one of the main drawbacks of biodegradable films is the low barrier they offer against external agents that can thus easily accelerate the foods degradation during shelf-life. In this study, a multilayer material obtained by the adhesion of two polylactic acid (PLA) films with cold plasma application, in place of synthetic adhesives, was realized. Moreover, cold plasma treatment was employed to immobilize the oxygen scavenger agent (ascorbic acid), chosen for the activation of the packaging material. Preliminary studies on activated PLA pouches filled with sunflower oil, used as model system, were performed. Model systems were stored at 35C to accelerate oil oxidation phenomenon and analysed for PV and colour during 64 days of storage. After that, different samples of "Genovese pesto", were tested as real food, stored at 25 and 45C and analysed for PV, water activity, rheological parameters... Read More

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The low oxygen barrier property of poly(lactic acid) (PLA) film extremely impedes its widespread application for food package. Appling an oxygen barrier coating to the surface of PLA film represents an effective means of addressing this issue. However, existing coating strategies via layer-by-layer are often time-consuming. Herein, we report the design and fabrication of a one-step scalable assembled poly(vinyl alcohol) (PVA)/tannic acid (TA) complex coating on the surface of PLA film as an advancement of our previous layer-by-layer assembled PVA/TA multilayer coating. By tailoring the mass ratio of PVA and TA, the oxygen barrier property of PLA film can be improved from low grade to high grade, which is comparable to that of PVA/TA multilayer coating (20 bilayers), and even superior to those of many food packaging films. Meanwhile, the oxygen barrier mechanism is analyzed, which proposes a new guideline for the development of high oxygen barrier coatings via a convenient and efficient approach.

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Nowadays, there is an increased interest for developing of innovative edible food packaging, prepared as thin layer and then used as a wrapper on food materials, or edible food coatings adhering to the food surface. The essential benefits of edible food packaging systems, by comparison with petroleum-based food packaging materials, are the following: They represent an entire component of the food product, have a role in extending shelf-life, can be eaten without having to take out and discard the package, decay easily, and are environmentally friendly. The aim of this chapter is to investigate the advantages and limitation of the main biopolymers used for fabrication of edible and coating food packaging, their compositions with additives, plasticizers, and bioactive agents, as well as the performance required for use in food packaging applications.

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Paper-based food packaging is lightweight, low cost, and highly flexible, but it suffers from a very high oxygen transmission rate (OTR 11,100,000 cc/(m2dayatm)). Herein, two polyelectrolyte-based coacervate coatings were studied as oxygen gas barriers on kraft builder's paper. A single coating deposition of a polyethylenimine-poly(acrylic acid) coacervate, adding less than 20% to the paper's weight, reduced the OTR to 164,000 cc/(m2dayatm). This work not only demonstrates a significant OTR improvement of a poor oxygen barrier material, but also provides the foundation for polyelectrolyte-based layers to be deposited on cellulosic materials at an industrial scale.

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An EVOH resin composition that is excellent in impact resistance and adhesive strength when formed into a film, and is also excellent in color tone stability. The composition includes the EVOH, acetic acid and/or a salt thereof, an aliphatic carboxylic acid other than acetic acid, and an aliphatic carboxylic acid metal salt. The metal species of the aliphatic carboxylic acid metal salt is at least one kind selected from long Periodic Table 4th-period d-block elements. The composition has specific ratios of the components that improve impact resistance and adhesive strength while maintaining color stability.

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A barrier film for packaging and agricultural applications that combines a calcium carbonate-based layer with an ethylene-vinyl alcohol copolymer (EVOH) layer to provide a synergistic barrier against gas and moisture transmission. The calcium carbonate layer provides mechanical strength and the EVOH layer provides high gas and moisture barrier properties. The film is recyclable and can be used in applications such as packaging, mulching, and greenhouse films.

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Active packaging is a new generation of packaging that, unlike traditional packaging, allows the preservation of food, not only contains it. Active packaging interacts with the food and the environment and, through different mechanisms, prevents its deterioration. These packages contain substances such as oxides, acids, alcohols, peptides, polyphenols, polysaccharides and fatty acids that can absorb or emit gases, regulate humidity, maintain temperature and act as antioxidants and antimicrobials. Within this group of container, smart packaging and edible coatings can be included. The smart packaging contains sensors that provide information on the presence or absence of a substance and others reflect the temperature, freshness and maturation of the food. The coatings, for their part, act as a barrier to gases and can integrate antioxidant and antimicrobial substances that prevent food deterioration. The purpose of this chapter is to provide a general description of active packaging, briefly explaining the different systems under which they work, the substances and the principles on w... Read More

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A method for manufacturing barrier-coated paper or cellulose-based substrates for packaging applications, comprising dispersion coating of a barrier pre-coating and subsequent vapour deposition coating of a barrier deposition coating. The barrier coating is formed from reduced graphene oxide, which is produced by chemically reducing graphene oxide flakes in an aqueous dispersion containing nanocellulose. The coated substrate is then laminated with other layers to form a packaging material suitable for aseptic packaging of liquid foods.

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A method for manufacturing barrier-coated paper or cellulose-based substrates for packaging applications, comprising dispersion coating of a barrier pre-coating and subsequent vapour deposition coating of a barrier deposition coating. The barrier coating is formed from reduced graphene oxide, which is obtained by chemically reducing graphene oxide flakes or particles. The reduced graphene oxide coating is applied to a substrate material web using an aqueous composition and a reducing agent, followed by drying and reduction steps. The resulting barrier-coated substrate material is suitable for use in laminated packaging materials for liquid food products, particularly for aseptic packaging applications.

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A gas barrier film with improved resistance to hot water treatment, comprising a substrate of polyethylene or polypropylene, a gas barrier layer formed on the substrate, and a cover layer formed on the gas barrier layer. The substrate surface has an oxygen-to-carbon (O/C) ratio of 0.03 or more, which enables high adhesion between the substrate and gas barrier layer even after hot water treatment.

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A barrier coating for polymeric films that achieves high oxygen barrier performance without the need for a thick coating. The coating comprises ethylene vinyl alcohol copolymer (EVOH) and ethylene acrylic acid copolymer (EAA) at a weight ratio of 1.5:1 to about 6:1. The EAA contains 10-35 wt % acrylic acid. The coating is applied to a film layer, dried to produce a thin EVOH/EAA barrier coating, and exhibits a 50% or greater reduction in oxygen transmission rate (23°C, 0% RH) compared to the film without the coating. The coating maintains clear packaging integrity while achieving barrier properties comparable to commercial ethylene vinyl alcohol (EVOH) coatings.

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Packaging film for food products that reduces leaching of antioxidants and maintains cleanliness while providing good gas barrier properties and strength. The film has an inner layer with 40-90% LLDPE, an adhesive layer with antioxidants, a gas barrier layer, another antioxidant adhesive layer, and an outer layer. The inner layer has density 0.920-0.943 g/cm3 and thickness 50-50 μm to prevent antioxidant migration. The antioxidant adhesive layers have thickness ≤30 μm. This film structure reduces antioxidant leaching compared to films with antioxidants in the inner layer, and provides good gas barrier, strength, and cleanliness.

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A gas barrier laminate with low water vapor transmission rate, comprising a laminated structure of a barrier layer, an inorganic material layer, and a base material in that order. The barrier layer comprises a water-soluble resin and a condensate of hydrolyzed metal alkoxide, which is treated with an anion exchange resin to reduce anion content.

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Solventless adhesive compositions for laminating flexible packaging materials that do not contain migratable isocyanate monomers, catalysts, or other low molecular weight migratable materials. The adhesives are made by combining polyols commonly used in lamination adhesives with polyols containing tertiary amine groups, and reacting them with monomer-free, solvent-free polyurethane prepolymers. This allows rapid curing of the adhesives without migratable isocyanate monomers or catalysts. The resulting laminates can be slit into narrower widths within hours of forming, without waiting days for the adhesive to cure.

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Packaging material for containing highly permeable contents like volatile foods, pharmaceuticals, or liquids that can penetrate through the packaging and degrade it. The packaging material has a specific structure to prevent the contents from damaging the packaging. It consists of a base material, a gas barrier vapor deposition layer, a gas barrier coating layer, an adhesive layer, and a sealant layer. The coating layer uses compounds like metal alkoxides, hydrolyzed metal alkoxides, or polymerized metal alkoxides. This coating layer disperses a hydroxy group-containing polymer between the silicon compound network. This prevents holes forming in the film structure, blocking gas permeation. The adhesive layer uses an acid-modified polyolefin resin and a silane coupling agent. This prevents the contents from swelling or dissolving the adhesive.

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Many food products are sensitive to oxygen which can promote rancidity, aerobic microorganism growth, browning, vitamin degradation, flavor loss, and other undesirable reactions. Active packaging concepts have been successfully applied to delay these deteriorative phenomena. In particular, oxygen scavengers help limit O 2 ingress into packaging thus extending product shelf-life and thereby reducing food waste. Besides oxygen barrier polymers, other composite materials have been developed to reduce the overall O 2 permeability into the package by adding oxygen scavengers or barrier fillers into the packaging structures. Typical thermoplastic food packaging barrier properties are summarized, including commercially available ones, and reported in the patent literature. Furthermore, various mathematical models have been developed to predict the oxygen transport behavior in active packaging to simulate oxygen transport in polymeric and composite materials. Such models are helpful to provide a better understanding of the mass transport fundamentals involved and shorten product development ... Read More

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A critical function of packaging is to protect the product. This often requires the inclusion of special barrier layers or coatings within a multilayer structure to manage gas and liquid permeation, provide oil and grease resistance, prevent loss or impartation of organic molecules affecting taste and aroma, and block light. This chapter examines the importance of barrier packaging, especially with respect to food packaging, describes methods for measuring barrier performance, and provides typical permeation properties of commonly used barrier materials. The science of permeation is reviewed with an emphasis on factors that control permeation in flexible packaging. The chapter concludes with a critical assessment of four emerging technologies: oxygen scavenging, layer multiplier technology, barrier nanocomposites and advanced coatings.

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Active natural additives can be loaded into bio-active packaging films in order to impart new functionalities and to broaden their potential application fields. However, they modify the film structure and properties, thus in this chapter, the authors aim to review the influence of the incorporation of natural additives and (bio)active compounds on the properties of active films potentially used as packaging materials able to prolong the shelf-life of packaged foodstuff. The chapter is focused on the effect of several active substances on mechanical behavior and barrier properties of active packaging materials, namely on their tensile stress, elastic modulus and elongation at break as well as oxygen, water vapor and UV light barrier properties. Several categories of (bio)active compounds are reviewed and particular attention is paid to active packaging films based on both polyolefin and biodegradable/bio-based polymers flexible films obtained by means of both solvent-casting and melt-mixing/extrusion techniques.

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Control of oxygen levels in package headspace directly preserves quality and safety of packaged foods and beverage. This research aimed to produce oxygen scavenging bio-based plastics to control oxygen contents in food packaging. Thermoplastic starch (TPS) was produced via extrusion compounding with different gallic acid (GA) contents (110%) and linear-low-density polyethylene (LLDPE). Morphology, relaxation behavior, surface and mechanical properties and oxygen scavenging capacities were investigated. Increasing GA content plasticized and facilitated starch melting. GA likely induced H-bonding and esterification with the TPS phase, which apparently modified mechanical relaxation behavior and interacted with LLDPE via CH bonded aromatic rings. Increasing GA to 5% gave more homogeneous microstructures and miscible GA, while a further increase caused clumps that likely reduced surface area available for oxygen. XRD intensity of TPS/LLDPE linearly decreased with increased GA that likely led to increased water vapor permeability possibly due to decreased crystallinity of the polymers. ... Read More

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Multi-layer polymeric film substrate comprising a core layer and an oxygen barrier layer, wherein the film exhibits an oxygen transmission rate (OTR) when measured in accordance with ASTM F1927-14 of below 200 cc/m2/24 hr at a relative humidity (RH) of 85% and/or of below 600 cc/m2/24 hr at a relative humidity (RH) of 90%.

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A polyethylene composition for barrier applications, comprising a blend of two ethylene copolymers with distinct properties. The first copolymer has a low molecular weight, high melt index, and a density of 0.930-0.960 g/cm3. The second copolymer has a high molecular weight, low melt index, and a density higher than the first copolymer but less than 0.980 g/cm3. The blend exhibits a bimodal molecular weight distribution, a high load melt index of at least 300 g/10 min, and a density of at least 0.949 g/cm3. The composition is suitable for injection molded, compression molded, and cast films, particularly for applications requiring high barrier properties.

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A laminate for packaging applications that combines a biaxially oriented polyethylene (BOPE) film with a barrier adhesive layer and a polyethylene film. The BOPE film is made from a specific polyethylene composition with a density range of 0.910-0.940 g/cm3 and molecular weight characteristics. The barrier adhesive layer is a polyurethane-based formulation that adheres the BOPE film to the polyethylene film, providing a high barrier to oxygen transmission while maintaining package integrity.

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Ozone-assisted treatments have shown exceptional outcomes for the surface sterilization of packaging materials among ozone, gamma-ray, UV, ion beam, electron beam and plasma treatments. In this chapter, various physical modes of surface modifications applied to the food packaging polymers are comprehensively presented. The operational principle of ozone treatment, the effect of ozone treatment, methodology, major deliverables from the previous studies are also presented. The effect of ozonation on mechanical, adhesion, and barrier properties of food packaging polymers are presented.

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Auxiliary compounds enhance the properties of the initial material. The design and processing of food packaging materials is becoming more and more challenging. This chapter presents the types and properties of barrier coatings, inks and adhesives used for food packaging. The coating process can be described as the application of a very thin layer of a specified functional material to a substrate. Coatings applied on metal are principally aimed at separating metal from a corrosive environment. In the packaging industry, adhesion and wettability play key roles in successful coating applications. Adhesives are an unavoidable part of packaging structure. Many types of adhesives are available for any specific application. They are used to: manufacture rigid packs from cardboard, seal flexible packaging, attach labels, and laminate layers of food contact materials. Various printing inks and varnishes are used for food packaging. The choice of ink may vary depending on the printing method used.

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Laminate is a product made by bonding together two or more layers or materials in order to create a new material with desirable properties. Demand for laminated packaging foils is frequently increasing with the adoption of high-quality packaging solutions by the food, beverage and pharmaceutical industries. Multilayer materials (laminates) have a multilayered structure and can be composed of plastic film only or composed of different materials. In the production of food packaging materials, the following lamination techniques are considered to be the most widely used: adhesive lamination, extrusion and coextrusion coating, and thermal lamination. Laminates are produced in such a way in order that the final product holds desirable properties for a particular application. This is mostly evident in their barrier properties. As a result of environmental issues, laminates should be redesigned in order for them to be identified and sorted much more easily.

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Retort food packaging film with improved durability and reduced aluminum usage. The packaging film has graphene-containing layers like sealant, adhesive, core, and surface. This allows thinner core layers since graphene increases mechanical strength, barrier properties, and chemical resistance. It reduces aluminum needed for packaging by using graphene instead. Graphene-containing layers provide benefits like increased mechanical strength, barrier properties, and chemical resistance. The graphene can be in any one or more of the layers. By laminating graphene-containing layers, thinner core layers can be used without compromising durability.

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A curable composition for forming a primer layer on a gas barrier film, comprising a polar group-containing polyolefin polymer and a polyfunctional acrylate compound. The composition enables the formation of a primer layer that enhances interlayer adhesion between the gas barrier film and an organic compound-containing layer. The primer layer is made of the cured product of the curable composition and is used in a gas barrier laminated film that includes the gas barrier layer and the primer layer in direct contact. The gas barrier laminated film is further laminated with an organic compound-containing layer to form a gas barrier laminate.

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Coated packaging materials that achieve high oxygen barrier properties through a novel polysaccharide-based coating. The coating comprises a polysaccharide derivative such as a poly alpha-1,3-glucan ether compound, and forms a continuous layer on at least one surface of the substrate. The coating composition can be applied through various lamination techniques, including wire rods, knife rolls, gravure rolls, reverse rolls, slot die, and curtain coating. The coated packaging materials exhibit superior oxygen barrier properties even under conditions of relative high humidity, making them suitable for food packaging applications.

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A multilayered article comprising a polyester resin layer and a barrier layer comprising a polyamide resin, wherein the polyamide resin includes a specific combination of meta-xylylenediamine and adipic acid units, and an amorphous polyamide resin with a specific dicarboxylic acid composition, to provide excellent oxygen barrier properties and delamination resistance.

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