Innovations in Cross-Linked Polyethylene for Packaging

Laminate material for packaging applications that has improved strength, heat resistance, and recyclability compared to conventional packaging materials. The laminate consists of a base layer made of polyethylene that is electron beam irradiated and stretched. This improves the properties of the polyethylene for use as a base layer in packaging materials. The irradiated base layer is then laminated with a heat seal layer also made of polyethylene. This allows recycling of the entire packaging material as polyethylene without separating different resins.

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Laminate for recyclable packaging materials that provides both strength and recyclability. The laminate has a substrate made of polyethylene, at least one surface of which is electron beam irradiated. The substrate and heat seal layer are made of the same polyethylene, with biomass-derived polyethylene used in some cases. The electron beam irradiation improves the substrate strength and heat resistance. Laminating the irradiated substrate with a polyethylene heat seal layer allows recycling of the whole laminate since it's all polyethylene.

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Laminate for producing packaging materials with improved strength, heat resistance, recyclability, and oxygen barrier properties compared to conventional laminates. The laminate has a substrate made of polyethylene or polypropylene that has been stretched or irradiated to improve properties. The heat seal layer is also made of the same polymer as the substrate. Oxygen absorbers in the adhesive layer and/or heat seal layer prevent contents oxidation. Using the same polymer for substrate and seal improves recyclability. The laminate can also have barrier coatings and gas barrier layers for enhanced properties.

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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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Recyclable flexible packaging that can be recycled more easily than current multi-layered flexible packaging. The packaging uses a single type of polymer, polyethylene, in all layers for enhanced recyclability. The polyethylene is crosslinked using electron beam radiation to improve properties like temperature resistance. The crosslinked polyethylene layer is then stretched to orient it. This allows recycling since the oriented crosslinked layer is thinner and easier to process compared to thick crosslinked layers. The packaging has a substrate layer crosslinked and oriented, and a separate sealant layer. Adhesive is used to join the layers.

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Gas barrier films, packaging films, bags, and products with improved oxygen barrier properties after heat sterilization like boiling or retorting. The films have a gas barrier coating layer made of a blend of a polyolefin and a water-soluble polymer containing hydroxyl groups. This coating layer provides low oxygen permeability before sterilization. After sterilization, the hydroxyl groups undergo crosslinking to further reduce oxygen permeability. This improves long-term oxygen barrier protection for packaged food and pharmaceuticals that are heat sterilized.

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Laminate for packaging materials with high recyclability and low environmental impact. The laminate has a protective layer sandwiched between a base layer and a sealant layer, all made of polyethylene. The protective layer contains an acrylic polyol, an isocyanate compound, and a metal. The laminate is heat cured using silane coupling agents and metal alkoxides. The metal in the protective layer provides barrier properties. The laminate has 90% or more polyethylene content for recyclability. The protective layer thickness is 0.4-2.0% of the laminate total. This laminate has good heat sealability, maintains appearance after hot water treatment, and high recyclability.

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Stackable shrink film that can be heat sealed multiple bags together without sticking. The film has an outer layer containing a low molecular weight compound like paraffin, oleamide, or stearic acid. The outer layer is also crosslinked by electron beam treatment. This prevents molecular chain interpenetration when the outer surfaces of adjacent bags are heat sealed, creating a peelable interface. The inner heat seal layer can have different materials. Adding the low molecular weight compounds and crosslinking the outer layer enables stacking and heat sealing multiple bags without fusing.

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A recyclable packaging material, made from a laminate with a base material that has improved strength and heat resistance compared to conventional polyethylene films. The base material is a stretched and electron-beam irradiated polyethylene film with a vapor-deposited film on one surface. The electron-beam treatment densifies the polyethylene and adds crosslinking, while the stretching increases crystallinity. This provides a recyclable packaging material with enhanced strength and barrier properties compared to conventional polyethylene films. The laminate can be used for packaging applications like bags and pouches.

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Monomaterialization of a laminate that has good adhesion and is easily made into a monomaterial. The laminate includes a polyethylene film having a vapor-deposited layer on at least one side of the base material and the heat-sealing layer.

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Automated packaging machine that creates sealed outer packaging around a group of upright folded packaging sleeves without using boxes or corrugated materials. The machine has a conveyor to move the sleeve group, a unit to prepare the outer packaging sheet, a sealing unit behind it, and a brake in front. The machine also has a heat treatment unit after the outer packaging unit to seal the protruding sheet material onto the front sides of the sleeves. This provides a sealed unit with the sleeves sandwiched between sealed sheets without using separate boxes. The sheet material can be a film like PE that is pre-stretched, sealed, and heat treated to strengthen and seal the unit. This avoids dust, moisture, and damage issues of traditional boxes while having a compact and recyclable outer packaging.

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Single-layer polyethylene film and foil for packaging applications that can be recycled without separating different plastic types. The film and foil have different physical properties on opposite sides due to electron beam irradiation. The irradiation crosslinks the polyethylene chains on one side, improving heat resistance and sealability. The unirradiated side maintains flexibility. This allows producing single-layer packaging films and foils that can replace multi-layer films for better recyclability. The irradiated film can also have improved heat sealing on both sides. The foil has a polyethylene backing irradiated on both sides and a non-irradiated layer. The packaging uses the single-layer films or foil instead of multi-layer films for recycling.

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Recyclable flexible packaging film with improved heat resistance for primary packaging of products like food and beverages. The film has an outer surface with targeted crosslinking for heat resistance and an inner layer with a lower crosslink density for recyclability. The film structure involves an oriented coextruded film with an outer region of low density polyethylene (LDPE) crosslinked by irradiation, a thin inner region of LDPE with an antioxidant, and a separate sealant layer. The outer region thickness is 1-50 times the inner region thickness to balance heat resistance and recyclability. The irradiation dose for the outer region is sufficient to crosslink but keeps the inner region below the gel point for easier recycling.

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Laminate structure for packaging materials that provides good strength, heat resistance, recyclability, and resistance to contents like acidic or alkaline products. The laminate has a base material, dry laminate layer, and heat seal layer all made of polyethylene. The base material is stretched or irradiated to improve properties. The dry laminate layer contains a component derived from unsaturated carboxylic acids in 0.01-5% by mass. This improves adhesion between layers over time. The laminate is used to make packaging bags and pouches with improved performance compared to conventional multilayer structures.

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Heat shrinkable packaging film with improved shrinkage properties and resistance. The film has a multilayer structure with a heat seal layer that contains a cross-linked polymer network formed by solid state orientation. This network tensions the heat seal layer during cooling, providing enhanced shrinkage. The film can contain no polyamide, replacing it with other polymers like ethylene copolymers. This avoids polyamide's hydroscopic nature that causes film instability before use. The film can have a core layer between the seal and barrier layers, containing a mix of copolymers and low density polyethylene. The barrier layer can be polyester. The film can have adhesion layers between the layers. The film can have plastomers with high melting points and low melt indices for additional strength.

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Laminate for packaging materials with improved strength, heat resistance, recyclability, and oxygen barrier properties. The laminate has a base material made of polyethylene or polypropylene that is stretched and irradiated with electron beams. This treatment significantly improves the strength and heat resistance of the base material. The laminate also contains an oxygen absorber in the adhesive layer and/or heat seal layer. This prevents oxygen ingress into the packaged contents over time.

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A laminate for recyclable packaging materials that provides improved strength and heat resistance while enabling recyclability. The laminate has a base material and heat seal layer made of the same polyethylene resin. The base material is stretched and electron beam irradiated to increase strength and heat resistance. The heat seal layer is thicker than conventional ones. This allows using the same polyethylene for both layers, making the laminate recyclable. The laminate can be used in packaging materials, bags, and stand pouches.

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A polyethylene laminate that has high heat resistance while maintaining heat sealability and recyclability. The laminate has a base layer with a density of 0.930 g/cm3 made of polyethylene. A heat seal layer with a density of 0.930 g/cm3 is added. The base layer is treated with electron beam irradiation to further improve its heat resistance. This allows crosslinking of the polyethylene without affecting the heat sealability of the other layer. The laminate has good heat resistance, heat sealability, and is recyclable since it is made of a single polyethylene material.

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Polyethylene laminate packaging material with improved heat resistance while maintaining recyclability. The laminate has a base layer with density 0.930 g/cm3 made of biomass-derived polyethylene and treated with electron beam irradiation to further improve heat resistance. The heat seal layer also has density 0.930 g/cm3. The irradiation crosslinks the polyethylene, enhancing heat resistance without reducing sealability. The densities of 0.930 g/cm3 prevent stickiness issues. The laminate can be made by coextrusion with lower density polyethylene layers.

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Laminate with high recyclability and heat sealability, and a packaging material using the same. The laminate has a protective layer made of a thermosetting resin on the outermost side of the base layer, which is made of polyethylene. The base layer and intermediate layer have a probe drop temperature of 180°C or higher. The laminate has at least 90% polyethylene by mass. This provides excellent recyclability while maintaining heat sealability and strength. The thermosetting protective layer prevents polyethylene adhesion during heat sealing.

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