Research on Biodegradable EVOH Films

Compostable multilayer film for making lids of capsules for beverage pods that can be easily broken during extraction without adhesives. The film has two layers, an outer one and an inner one. The inner layer is a compostable biopolymer loaded with embrittlement additives. It provides adhesion to the outer layer and the cup body, sealing the capsule, while also allowing the capsule to easily break open during extraction. The inner layer also filters powder from the capsule. The compostable, adhesive-free multilayer film enables compostable capsules for brewing beverages like coffee that can be easily broken during extraction without adhesives.

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Multilayer heat shrinkable film for food packaging that combines excellent shrinkage, optical properties, burnthrough resistance, and recyclability. The film comprises an outer layer of ethylene vinyl acetate (EVA), a heat sealing layer of ethylene alpha olefin (EAO) with density less than 0.915 g/cm³, and an oxygen barrier layer of ethylene vinyl alcohol (EVOH). The film achieves high shrinkage (10% or more) while maintaining excellent optical clarity and burnthrough resistance. The sealing layer ensures hermetic packaging, while the EVOH barrier prevents oxygen ingress. The film is optimized for food packaging applications, particularly for frozen products, and can be used for packaging of various food items.

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A recyclable packaging solution that combines barrier properties with recyclability through a novel laminated film structure. The film comprises a base material of polyethylene terephthalate (PET) on one side and a coextruded sealant containing ethylene-vinyl alcohol (EVOH) on the other. The sealant layer, with its 6 μm EVOH barrier, provides enhanced barrier performance while maintaining recyclability through its thin thickness. The PET base material enables recyclability through conventional recycling processes, while the EVOH sealant layer enhances barrier properties.

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A film, laminated film, and packaging bag with improved recyclability and barrier properties. The film has two layers, an inner layer made of polyethylene (PE) and an outer layer made of ethylene-vinyl alcohol copolymer (EVOH). The layers are coextruded and then stretched in the same direction. This allows the film to be recycled as a single material while maintaining barrier properties. The EVOH layer thickness is 6 μm or less. The film can be used in laminated structures or packaging bags.

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Compostable capsule for beverage machines that opens reliably with compostable materials while maintaining quality and consistency. The capsule has a delivery wall with separate retaining and filter layers that open sequentially under pressure. The retaining layer opens first to allow fluid injection, followed by the filter layer to prevent particles in the beverage. Both layers are made of biodegradable materials. The sequential opening design allows efficient fluid extraction through the filter without puncturing it. The compostable capsule provides a sustainable alternative to aluminum capsules with improved extraction and compostability.

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Biodegradable material with improved mechanical properties and transparency compared to conventional biodegradable materials like polylactic acid (PLA). The material is made by combining PLA, thermoplastic starch, epoxy compound, and graphene. The epoxy compound reacts with hydroxyl or carboxyl groups in PLA and starch to form a network structure that wraps graphene. This provides good compatibility between the materials and improves mechanical properties while maintaining transparency. The biodegradable material can be used for applications like food packaging and mulch films.

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A composite biodegradable plastic material for food packaging that combines starch, degradable resins, stabilizers, and dispersants to provide improved mechanical strength and degradability compared to starch-based plastics. The starch is modified with enzymes to shorten the chain length and increase branching for better crystallization and mechanical properties. Graphitic carbon nitride nanoparticles are added as a reinforcing agent and antibacterial agent. The composite material is prepared by extrusion molding.

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Preparation of a completely bio-based material through a biocatalytic process. The method involves enzymatically converting renewable biomass into bio-based monomers, followed by polymerization of these monomers to form a fully bio-based polymer material. The process leverages biocatalysts to transform biomass-derived feedstocks into the polymer building blocks, eliminating the need for petroleum-based feedstocks. The resulting material exhibits the unique properties of biodegradability, renewable sourcing, and reduced environmental impact associated with traditional polymer materials.

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A biodegradable material and preparation method that can rapidly degrade in the environment without polluting. The material is made by blending polylactic acid, modified bamboo fiber, modified starch, polyethylene, surfactant, UV stabilizer, antioxidant, and stabilizer. The degradable components like polylactic acid, bamboo fiber, and starch allow natural biodegradation. But to speed up degradation, nano-zinc oxide and anatase titanium dioxide photocatalysts are added. These degrade under light exposure, accelerating material breakdown. Without light, the material is normal.

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Fully biodegradable material made from renewable sources like modified polylactic acid, plant fiber, starch, plasticizer, antioxidant, and filler. The material is prepared by extrusion molding the components at specific temperatures. It provides a fully biodegradable alternative to traditional plastics made from petroleum-based polymers. The biodegradable material has applications in products like packaging, utensils, and containers.

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Manufacturing biodegradable paperboard cups for beverage containers that achieve both food-grade performance and environmental sustainability. The cups feature a coated paperboard with a biodegradable varnish applied to at least one face, where the varnish is precisely controlled to achieve optimal performance in terms of heat sealing, moisture management, and sensory protection. The coated paperboard is cut into side walls and bottom, then heat-sealed to form the cup. The varnish application process ensures consistent performance across multiple layers, while the cutting process eliminates the need for separate PE separation. The biodegradable varnish coating enables the cups to be compostable at ambient temperatures, making them an attractive alternative to traditional PE-lined cups.

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High barrier, heat sealable films for retort applications with improved retort-shock recovery. The films have a multilayer structure with an outer layer that transmits moisture, followed by two inner layers of retortable EVOH copolymer separated by a moisture transmitting layer. This configuration allows the EVOH layers to recover their oxygen barrier properties faster after retorting compared to EVOH-only films. The moisture transmitting layers absorb water during retorting but prevent oxygen ingress between the EVOH layers. The films have good retort barrier recovery over time despite the moisture-absorbing layers.

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Easily degradable packaging material made from biodegradable polymers like polylactic acid (PLA) and polycaprolactone (PCL), wood fiber, modified starch, and modified polyethylene. It also contains degradants like nano-zinc oxide and anatase titanium dioxide to accelerate degradation when exposed to light. The material has natural biodegradability without producing harmful substances. The degradants only activate in light to catalyze oxidation, not during normal use. Antioxidant, stabilizer, and plasticizer complete the formulation. The components are mixed in specific weight ratios.

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Substrate, vapor-deposited substrate, laminate, and packaging container with improved gas barrier properties for recyclability. The substrate has a polyethylene layer and a surface layer with a resin having a melting point of 150°C or higher, like ethylene vinyl alcohol copolymer. The high melting point surface layer improves adhesion between layers when vapor deposited. This allows using polyethylene for the base instead of less recyclable materials like polyester. The vapor deposition further improves gas barrier properties. The laminate has this substrate plus a sealant layer. The packaging container is made from the laminate.

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Multilayer film for food packaging that combines barrier properties with biodegradability. The film comprises a first, second, and third layer, with the second layer featuring a porous filter paper. The film achieves an oxygen barrier of up to 0.4 cm3/m2, while maintaining sufficient moisture barrier properties. The film's multilayer structure allows for optimal performance in both oxygen-tight and moisture-tight applications, including food packaging and beverage containers.

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A degradable barrier packaging film that combines barrier properties with biodegradability through microorganisms. The film incorporates a biodegradable polymer like polylactic acid (PLA) that decomposes naturally in the environment, replacing traditional non-biodegradable plastics. This film provides excellent barrier protection against air and water vapor, while its biodegradable nature enables the film to break down naturally through microbial action, eliminating the need for traditional waste management solutions. The film also possesses antibacterial properties to prevent contamination.

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A method for preparing high-strength, low-cost, fully biodegradable materials by combining plant fibers and polylactic acid fibers as reinforcing fillers. The method involves processing plant fibers into fibers through a specific spinning process, followed by incorporating them into a biodegradable polyester matrix. The plant fibers enhance the material's mechanical properties while the polylactic acid fibers improve its biodegradability. This innovative approach combines the benefits of biodegradable polymers with natural fibers to create a sustainable, high-performance material.

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A biodegradable material with enhanced mechanical properties and improved degradation rate, comprising a blend of starch, lignin, and polybutylene succinate (PBS). The material is prepared by combining starch and lignin, then mixing with PBS. The starch-lignin blend enhances the material's mechanical properties while the PBS provides a biodegradable matrix. The starch-lignin blend is prepared by a two-step process involving pre-plasticization of starch followed by blending with lignin. The resulting material exhibits improved elongation at break and degradation rate compared to conventional starch-based bioplastics.

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A barrier coating for polymeric films that achieves high gas barrier properties without the need for thick PVDC coatings. The coating consists of an ethylene vinyl alcohol copolymer/ethylene acrylic acid copolymer blend (EVOH/EAA) at a weight ratio of 1.5:1 to 6:1. The blend is applied to a film surface and allowed to dry, producing a thin barrier coating with a percent reduction in oxygen transmission rate of 50% or greater at 23°C, 0% relative humidity. The coating achieves barrier properties comparable to PVDC while maintaining recyclability and reducing production costs.

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A compostable lid for coffee capsules that combines mechanical resistance, oxygen barrier properties, and non-woven support. The lid comprises a multilayer structure with a support, an oxygen barrier layer, and a non-woven layer facing the capsule rim. The support provides mechanical stability, while the oxygen barrier layer prevents moisture and pressure-related issues during the coffee brewing process. The non-woven layer enhances filter separation and prevents coffee powder migration. The lid is designed to maintain its integrity even after repeated capsule ejection and handling.

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