Polyethylene in Packaging Applications

Polymeric film, sheet, and wrapper with dead fold characteristics that allows folding, twisting, and reclosing without using adhesives. The structure has multiple layers of low and high density polyethylene (LDPE and HDPE) sandwiched with cyclic olefin copolymer (COC) or ethylene vinyl alcohol (EVOH) barrier layers. This provides barrier properties, tear resistance, and dead folding ability. The outer LDPE layer can have printed inks and sealant coating. The dead folding allows folding the wrapper shut after opening without needing adhesives.

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Packaging film with a low gloss suitable for products like pet food, cereals, and healthcare items. The film has a coextruded layer structure with a first layer containing 5-30% cyclic olefin copolymer (COC) and 70-95% polyolefin. This provides a gloss of <=50% while the COC's higher glass transition temperature improves thermal resistance. The film can be recyclable, have better recyclate quality, and better stiffness compared to conventional films with matte coatings or micron-sized inorganics. The film can be blown or cast oriented, have a barrier layer, and have printed indicia.

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Polyolefin packaging material that is fully recyclable and reusable without special separation steps. The packaging uses a polyolefin bonding adhesive layer made from a modified copolymer of C2-C4 olefins like ethylene and butylene. The copolymer is grafted with maleic anhydride at a ratio of 0.5-5%. This adhesive layer bonds two polyolefin films, like a cast polypropylene and an oriented polypropylene, to create a packaging material that can be directly recycled and reused without separating layers. The modified adhesive provides good bonding strength, transparency, and impact resistance.

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Recyclable flexible packaging film made of similar materials to enable recycling without solvent inks. The film has a crosslinked polyethylene substrate layer made by electron beam treatment, followed by stretching. This is laminated with a sealant polyethylene layer using an adhesive. The crosslinking improves heat resistance and recyclability compared to untreated polyethylene. The thicknesses of the crosslinked layer, adhesive, and sealant are optimized for recyclability. The monolayer and multilayer film structure allows recycling by pelletizing since all layers are the same polyethylene.

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Co-extruded multi-layer polymeric films for packaging flowable products like food and beverages. The films have a unique structure with an inner sealant layer, outer sealant layer, and a thin barrier core layer sandwiched between. The sealant layers are high-density ethylene-alpha-olefin copolymers. The barrier layer is a low-density ethylene-vinyl alcohol copolymer with high ethylene content. This provides good barrier, toughness, and flexibility while maintaining recyclability. The films can be used in bags for flowable products that require refrigeration without leakage or emptying issues.

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Gas barrier film for packaging applications that provides a mono-material packaging solution while maintaining strong adhesion between layers. The film has a base material made of stretched polyethylene with a low probe descent temperature (around 170°C) to enhance adhesion to the heat seal layer. An inorganic oxide layer or oxygen barrier membrane is formed on the base material surface. The film can be used in a laminate structure with another polyethylene layer joined by adhesive. The low probe descent temperature base material enables strong adhesion between the layers without delamination.

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Packaging laminate for food products that meets USDA and FDA requirements for extending shelf life, being recyclable, and having high barrier properties. The laminate has two or more layers of polyolefins like HDPE, LDPE, LLDPE, and PP. The outer layer is a printable HDPE with calcium carbonate. The inner layer is HDPE, LLDPE, and LDPE with an EVOH barrier and compatibilizer. This allows sealing, recyclability, and barrier properties for food packaging. The laminate can also have a middle HDPE layer.

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A stable void-fill packaging material made from a blend of recycled and virgin polyethylene that provides consistent transparency and bubble stability for automated packaging processes. The blend contains at least 50% recycled polyethylene and at least 40% virgin polyethylene, along with moisture scavengers and melt stabilizers to prevent voids and inconsistencies in the film. The recycled and virgin polymers are blended to balance properties like tear strength, impact resistance, and transparency.

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Propylene-ethylene random copolymer compositions for hot fill packaging applications like containers and films for food and beverage packaging. The compositions have propylene as the main monomer, ethylene content around 3-5%, melt flow rates 1-100 g/10 min, and xylene solubles less than 7%. The copolymers are produced using Ziegler-Natta catalysts with alkoxysilane electron donors. The compositions have good stiffness, heat resistance, and transparency for hot filling and sealing food containers.

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A specific multilayer mono-material PE assembly for packaging applications that is environmentally sustainable, recyclable, and provides durability, versatility, lightness, gas and moisture barrier, chemical resistance, and adhesion without adhesives. The assembly has at least two layers of high-density PE (HDPE) and a middle layer of PE blend with lower melting temperature. The HDPE layer prevents softening during sealing, and the lower melting blend layer allows adhesion. This enables recyclability without adhesives while maintaining performance during packaging steps. The HDPE density is 0.935-0.951 g/cm3 and the blend density is 0.911-0.924 g/cm3. The blend composition can vary. The assembly can have additional layers like printed, varnish, metallization, EVOH, or gas barrier coatings

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A mono-material stand-up pouch packaging bag that can be easily recycled since it uses only one type of polyethylene resin for the bag material instead of multiple layers like in conventional bags. The bag has a unique bottom seal design with a convex shape near the connections to the side seals. This shape distributes stress from the bag contents more evenly to prevent concentration at the corners and improve impact resistance. The convex shape also allows the bottom to expand more on the side above the fold line to disperse content loading force.

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Polyethylene-based resin composition and packaging material that has improved moldability, bag-making processability, and film strength when inorganic compounds like calcium carbonate are added. The composition contains an ethylene-α-olefin copolymer with specific properties and an inorganic compound like calcium carbonate. The ethylene-α-olefin copolymer has 6-8 carbon α-olefin units, a melt flow rate of 0.8-4.0 g/10 min, and a melting point of 90-130°C. The inorganic compound content is 50-80% by mass and the copolymer content is 10-50% by mass. This composition enables better film properties when inorganic compounds are added compared to conventional compositions.

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Recyclable polyethylene film for large bags that replaces PET in current laminates to improve recyclability. The film has a core layer sandwiched between tie layers. The core contains olefin block copolymer, low density PE, and high density PE. The tie layers have high density PE and low density PE. This composition provides good drop resistance similar to PET/PET laminates but with all PE for recyclability. The film can be oriented for strength.

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Encoding packaging containers made of rigid plastics like HDPE, PE, PET, and PP for food storage. The encoding is done during the container production process by deep drawing the initial flat plastic sheet into the container shape. Laser treatment on the tool mold inserts creates tiny codes on the inner surfaces that imprint as codes on the container's outer surface during deep drawing. The codes are invisible to the naked eye but can be scanned to read product info, enable recycling tracking, prevent fraud, etc.

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Packaging laminates for food products that meet regulatory requirements and are recyclable. The laminates have two or more polymeric layers, such as an outer layer of high density polyethylene (HDPE) and an inner layer of HDPE, LLDPE, or LDPE with a coextruded ethyl vinyl alcohol (EVOH) barrier. This allows recycling by extruding and pelletizing the laminate, then adding a specific amount of LLDPE for recyclability. The laminate can also have a middle HDPE layer.

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Resin laminate, packaging containers, and a production method for the laminate without adhesives or coatings. The laminate has layers with oxidized surfaces and uses low density polyethylene (LDPE) with density 0.850-0.915 g/cm3 for the intermediate layer. The LDPE density range ensures good peel strength without adhesives. The outer layers can be thermoplastic resins or cellophane. The production method involves plasma treating the outer layer surfaces, sandwching molten LDPE between them, and continuously laminating with ozone treated molten LDPE. This provides peel strength without adhesives or coatings.

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Laminate for standing pouches that can be recycled and allows easy squeezing. The laminate has a substrate layer and a heat-sealing layer. The laminate contains at least 90% by mass of polyethylene. This allows recycling of the pouch as a single material. The high polyethylene content also enables easy squeezing of the pouch contents due to improved stiffness and strength.

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Gas barrier laminate for packaging food using polyolefin substrates that provides good hot water resistance and bending properties. The laminate has a metal oxide layer, an overcoat layer containing PVA, and a softening temperature of 100-170°C for the overcoat surface. This allows using polyolefin substrates like polypropylene or polyethylene for the laminate, which improves hot water resistance and bending compared to using polyester or nylon. The laminate can be used in packaging bags and containers.

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Multi-layer films for bags used to package flowable liquids like dairy products that have improved toughness and seal strength, especially under refrigerated conditions. The films have an outer and inner sealant layer containing an ethylene/α-olefin interpolymer, with optionally an intermediate layer between them also containing the interpolymer. This composition improves bag performance when filled with chilled liquids compared to conventional films. The interpolymer composition has specific properties like density and melt index.

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Stable void-fill packaging film made with a mixture of recycled and virgin polyethylene resins, moisture scavengers, and melt stabilizers to overcome inconsistencies in recycled resins that affect packaging performance. The film composition contains at least 50% recycled polyethylene, at least 40% virgin polyethylene, a moisture scavenger like calcium oxide, and a melt stabilizer like elastomeric polyolefin. This stabilized recycled polymer blend provides consistent film properties like transparency, bubble stability, and drawdown for void-fill packaging applications. The scavenger removes moisture during extrusion to prevent voids in the film, and the stabilizer improves melt strength and processability. The film can be blown into pillow shapes for cushioning and packaging applications.

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