Gas Barriers for Food Package Protection

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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A laminated packaging material for liquid, semi-liquid, and adhesive food pouch packaging that provides improved barrier properties, sealability, and puncture resistance compared to conventional laminated packages. The material has a bulk layer of cellulose-based material, a barrier layer with gas barrier coating, and an innermost heat-sealable layer. The innermost layer is a pre-formed polyethylene film with specific properties. This composite structure allows aseptic packaging of liquids with reduced carbon footprint and improved performance compared to aluminum foil alternatives. The paper bulk layer is thinner than usual, the barrier layer is a coated paper, and the innermost layer is a pre-formed film. The film is biaxially oriented LLDPE with 60-100% LLDPE content. This provides a balance of barrier, sealability,

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Packaging film, bags, and products with improved gas barrier properties while minimizing decreases in polyolefin content. The packaging film has a gas barrier layer, adhesive layer, and sealant layer. The gas barrier layer has a polyolefin base layer, vapor deposition layer, and a coating layer. The coating layer has a hardness less than 1.15 GPa. The adhesive layer is made by bonding a polyolefin adhesive resin to the film. The sealant layer is also polyolefin. This configuration allows the gas barrier properties to be maintained while minimizing polyolefin reduction compared to conventional multilayer films.

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Packaged sliced rare, medium rare, and medium cooked roast beef that maintains its pink color for longer shelf life without using artificial preservatives like BHA or BHT. The sliced cooked roast beef is sealed in flexible, gas-impermeable packages flushed with a mixture of carbon dioxide, nitrogen, and a small amount of carbon monoxide. The carbon monoxide slows oxidation and prevents discoloration. The packages are formed without trays to reduce weight and cost. This allows long-distance transportation without refrigeration, benefiting remote locations.

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Multilayer polyester bottles like PET bottles for carbonated beverages that have improved gas barrier properties without degrading the PET, impacting stretch ratio, or negatively affecting clarity. The bottles have a barrier layer sandwiched between two PET layers. The barrier layer is made of a furandicarboxylate-based polyester like poly(ethylene furan-2,5-dicarboxylate) (PEF) with lower gas permeability than regular PET. The furandicarboxylate polymer improves barrier without plasticization issues compared to additives. The multilayer design prevents delamination and maintains mechanical properties.

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Metallized film for packaging materials with improved gas barrier properties and adhesion when laminated with other films. The metallized film has a specific layer structure. The anchor coat layer is made of polyester resin with a viscosity average molecular weight of 500-10,000. It contains a base resin, curing agent, and additive. The base resin:curing agent ratio is 100:20-200. The total base resin:curing agent:additive ratio is 100:10-200. The additive is a compound containing glucose rings. This layer structure provides excellent gas barrier properties and adhesion when laminated with other films.

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Thinner gas barrier laminate for packaging that maintains high gas barrier properties in high temperature and high humidity environments. The laminate has a total thickness of 100 microns or less. It achieves this by forming a gas barrier layer using a coating liquid that undergoes a specific filtration process. This filtration reduces particle size to improve adhesion and barrier properties when the coating is dried and cured. The coating contains a polybasic acid and polyamine to form crosslinked chains. The laminate structure includes a base plastic with a metal-containing layer in contact with the gas barrier layer.

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A paper or paperboard packaging material that replaces aluminum foil layers in laminates for improved barrier properties against moisture, grease, and gases like oxygen. The packaging has a paper or paperboard base layer coated with a thin extruded layer of ethylene vinyl alcohol (EVOH) polymer. The EVOH layer provides superior gas barrier without the need for aluminum foil. The paper base allows recyclability without the foil. The EVOH layer thickness can be optimized to balance barrier and sealability. The paper base can have coatings or fillers to enhance barrier further.

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A controlled environment system for maintaining ultra-low oxygen concentrations inside shipping containers to prevent spoilage of perishable food products. The system uses stored compressed gases like nitrogen, carbon dioxide, and inert gases to positively pressurize the container and replace the oxygen. Sensors monitor the gas concentrations, temperature, and usage. Controllers release the gases at a variable rate to maintain consistent ultra-low oxygen levels. The sealed container's limited permeability further minimizes oxygen ingress.

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A thin, high barrier film with improved gas and moisture barrier properties compared to conventional multilayer films. The film has a unique structure with a multi-nano layer stack containing at least 10 alternating layers of different resins like nylon, maleic anhydride grafted polyolefin, and ethylene vinyl alcohol. This nano layer stack is sandwiched between tie layers of maleic anhydride grafted polyolefin. The nano layers provide gas barrier while the tie layers improve adhesion. The overall thin film has low oxygen and moisture permeability even when exposed to moisture.

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Laminated film for food packaging that provides both oxygen and water vapor barrier properties while being recyclable. The film uses a base layer of polyolefin or olefin copolymer, followed by a barrier primer layer, and a thin aluminum deposition layer. The primer improves adhesion between the polyolefin and aluminum. The primer is made by coating a composition containing carboxylic and hydroxyl polymers. This allows crosslinking to improve barrier properties while avoiding excessive coupling agents that weaken the film.

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Laminated film with improved gas and water barrier properties while maintaining recyclability. The film has a polyolefin substrate, a barrier primer coating on the substrate surfaces, and a thin aluminum layer on the primer. The primer is a crosslinked polymer formed by coating a liquid containing silane, carboxyl-containing polymers, and hydroxyl-containing polymers. Crosslinking is done by electron beam radiation. The primer thickness is less than 1000nm.

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Laminated packaging material with improved gas barrier properties, processability, and toughness, while being environmentally friendly and convenient. The material consists of a base film containing a polyolefin resin like polypropylene, an adhesive layer, and a heat-sealable layer. At least one of the base films is a laminated barrier film with a gas barrier layer. The barrier film has oxygen permeability 30-1500 ml/m2dMPa, and lamination reduces permeability to 60 ml/m2dMPa. The improvement rate is 10 or more. The lamination process removes volatile components quickly. The barrier film is laminated with the base film to improve gas barrier performance and maintain it after physical loads like bending. The barrier film can be a thin inorganic layer sandwiched between base films. The base films can

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Gas barrier laminate for packaging that provides improved gas barrier properties while maintaining adhesion between layers. The laminate has three layers: (A) a base material with an inorganic layer, (B) a resin layer with a low glass transition temperature, and (C) a layer containing water-soluble polymers, metal alkoxides, and/or their hydrolysates. The resin layer contacts the inorganic layer, and the water-soluble layer contacts the resin. This configuration enables good adhesion between the layers, even if an inorganic layer like aluminum oxide is present, while also providing gas barrier properties. The low glass transition temperature resin and water-soluble polymer layers facilitate adhesion to the inorganic layer. The metal alkoxides and hydrolysates in the water-soluble layer further enhance

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Packaging for perishable foods that extends shelf life without using halogen-containing barriers or external coatings. The packaging uses a unique coated paper material with three layers. The first layer has hydrophobic polymers like waxes to prevent fat and grease penetration. The second layer has hydrophilic polymers to prevent fat transfer. The third layer has hydrophobic polymers again to prevent fat back-transfer. This sandwich structure provides a gas-tight, fat-barrier coated paper that can be used for packaging moist, fatty foods like meat and cheese without needing external coatings or aluminum barriers.

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Packaging film material with high antibacterial and high barrier properties for food and pharmaceutical applications. The film has a layered structure with a heat sealing layer, aluminum foil layer, base material layer, barrier layer, and protective layer. The barrier layer is made of multiple aluminum oxide films. This improves barrier, antibacterial, and impact resistance compared to a single aluminum foil layer. The protective layer has water-based polyurethane with hydrophobic materials, nylon, and nano-antibacterials.

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Stand-up pouch for retort packaging that recovers gas barrier properties after sterilization and maintains high barrier performance. The pouch has a base film with layers on one side: polyamide, ethylene-vinyl alcohol copolymer (EVOH), and heat-sealing resin. The polyamide and EVOH layers adjoin. This configuration allows better gas barrier recovery after retort processing compared to separating those layers.

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Multilayer structure for packaging applications like standup pouches that provides improved gas barrier properties after retort processing and better puncture resistance. The structure has an ethylene-vinyl alcohol copolymer (EVOH) barrier layer sandwiched between an intermediate layer containing polypropylene and a hydrocarbon resin, and a heat seal resin layer. The intermediate layer with the specific resin composition improves the barrier properties of the EVOH layer after retorting while avoiding excessive thickening. The hydrocarbon resin in the intermediate layer also improves puncture resistance.

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Laminated packaging film with improved gas barrier properties. The laminate has a base material, a resin layer, an inorganic vapor deposition layer, and a gas barrier adhesive layer. The resin layer thickness is 0.1-5 μm, preventing cracks in the vapor deposition layer during processing. The adhesive has isocyanate groups that react with the vapor deposition layer to form a strong bond. This prevents gas permeation through cracks in the vapor deposition layer. The resin and adhesive layers also improve processability and sealability compared to direct vapor deposition on the base material.

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Packaging laminate with reduced plastic usage and improved gas barrier properties for bags and containers. The laminate has three layers: an undercoat, a gas barrier layer, and a heat seal layer. The undercoat is a water-based acrylic coating with low roughness and water absorbency to prevent delamination. The gas barrier layer has a vinyl alcohol polymer modified with an acetoacetate group. This vinyl alcohol polymer has improved gas barrier properties compared to unmodified vinyl alcohol polymers. The modified vinyl alcohol polymer layer reduces the need for additional plastic layers for gas barrier properties.

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