Cross-Linked Polyethylene for Package Protection

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.

Source

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.

Source

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.

Source

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.

Source

Barrier and flame-retardant polyolefin packaging material with improved properties compared to conventional polyolefin packaging. The material contains a specific graft copolymer with a cross-linked network structure that improves adhesion between the phases and provides better barrier and flame resistance. The graft copolymer is made by reacting carboxylated polyethylene with graphene oxide, then blending the graft with pentaerythritol phosphate catalyzed by isocyanate.

Source

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.

Source

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.

Source

Laminate, package, and packaged article with high recyclability, heat resistance, and strength. The laminate has polyethylene-containing base, adhesive, and sealant layers. The base layer has a high crystallinity (35% or more) measured by X-ray diffraction. This improves the laminate's heat resistance and puncture strength. The high crystallinity base layer, when used in packaging, reduces pinhole formation during sealing. The laminate can further have an intermediate layer, gas barrier layer, protective layer, and coloring. The high crystallinity base layer enables recycling with high polyethylene content.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

Heat-shrinkable packaging film with high shrinkage, toughness, and tear resistance for creating post-shrink, full-length tear packages via manual tearing. The film has a multilayer structure with an incompatible polymer blend containing a plastomer and ethylene homopolymer or copolymer, an ethylene/alpha-olefin plastomer, and a crosslinked polymer network. The outer layer is polyester, the oxygen barrier is PVDC or an ester copolymer, and the inner layer is the heat-seal layer. This film allows high shrinkage, strength, and tear initiation from the plastomer blend, while the crosslinking prevents necking during shrinkage. The ethylene/alpha-olefin plastomer provides low density.

Source

Packaging material that is recyclable and has improved strength. It consists of a laminate where both the base material and heat seal layer are made of polyethylene. The base material is stretched and irradiated with electrons. This enhances its strength. The irradiation treatment is done on one side so that it becomes the outermost layer. The stretched and irradiated polyethylene base provides better strength than normal polyethylene. The laminate with both layers made of the same material allows recycling of the packaging as pure polyethylene. The irradiated base improves recyclability by preventing melting and sticking of the base during processing. The laminate can be used for bag or pouch packaging.

Source

Film, packaging bags, and laminates with improved recyclability and content concealment. The film is made from polyethylene or polypropylene, contains biomass-derived polymer, and has one surface electron beam irradiated. This irradiation provides different properties on the outer vs inner surfaces. The irradiated surface has higher crosslinking and strength. The film can be used as a base for laminates with a biomass-derived polymer sealant layer. It also allows making packaging bags without laminates by using the irradiated side inward. The irradiation changes the film's hand-tearability and sealing properties. Adding a white pigment further improves content concealment.

Source

Heat shrinkable packaging article with easy openability after shrinking. The article has a multilayer film structure with a crosslinked outer layer that provides high shrinkage and hand tear resistance. The crosslinked layer is formed by irradiating a portion of the film. This allows the article to shrink tightly around products like meat but can be easily torn open by hand after full shrinkage. The multilayer film also has oxygen barrier properties and can be made without polyamide, reducing cost.

Source

Polyethylene laminated film with improved heat resistance and strength for packaging applications. The film has a polyethylene base layer irradiated with electron beams to crosslink the polymer. This layer improves surface properties like heat resistance and strength. An inner heat-sealable polyethylene layer seals the package. The outer irradiated layer prevents shrinkage and maintains dimensional stability during heat sealing. The irradiated layer also prevents degradation of the inner layer over time. The laminated film can be made by sandwiching the irradiated layer between two polyethylene layers. The irradiated layer improves the film's heat resistance and strength compared to a regular polyethylene film.

Source

Polyethylene co-pressing film and packaging material made from it that uses only polyethylene for recyclability. The film has an outer layer with heat-sealing properties and an inner layer made by electron beam irradiation. The irradiation crosslinks the polyethylene for improved dimensional stability. This allows heat sealing the outer layer to create a sealed packaging material made entirely from polyethylene. The inner layer prevents deterioration of the outer layer's sealing properties over time.

Source

Skin pack packaging with improved opening ease while maintaining product sealing and preventing migration of moisture between packaged items. The pack has a bottom and lid material with sealing properties. The bottom has a frame seal and surface seal. The peel strength between the bottom and lid is higher at the frame seal than the surface seal. This balance provides enough sealing force while allowing easier opening. The lid material has a cross-linked polyethylene outer layer for strength and heat resistance.

Source

Recyclable flexible packaging that uses electron beam (EB) curing of inks and in-situ crosslinking of substrates to provide sustainable and recyclable flexible packaging solutions for food and non-food applications. The packaging is made from recyclable materials like EB-treated oriented polyethylene (OPE) film, reverse printed EB inks, and sealant polyethylene film that can be easily recycled together due to the crosslinking. The OPE film is EB cured to prevent melting during sealing and the inks are also EB cured for adhesion. This allows recycling of the packaging as a single polyethylene layer instead of multiple dissimilar films.

Source

Recyclable films for high performance packaging applications that can be recycled in the polyethylene recycling stream without additional compatibilizers. The films have improved heat resistance and recyclability by orienting, annealing, and irradiating a polyethylene base film to crosslink the surface. This prevents shrinking and scuffing at high temperatures. The films can be sealed to themselves or other components using a compatible sealant. The irradiation crosslinking prevents sticking during heat sealing and enables hermetic seals. The films have low machine and transverse shrinkage of <10% at 90°C. The irradiation crosslinking also improves clarity, toughness, and seal initiation temperature compared to untreated films. The recyclable films can be used to make packages that can be recycled in the PE stream without needing additional compatibilizers.

Source

A multilayer shrink film for packaging food products that can be easily opened after shrinking. The film has a crosslinked polymer network in one portion to provide high shrinkage and break energy. The other portion contains a blend of incompatible polymers like ethylene homopolymer and ethylene/unsaturated ester copolymer with a plastomer. This allows high shrinkage and oxygen barrier properties without using polyamide. The film breaks along its length after shrinking by hand tearing. The crosslinked portion can be formed by irradiation. The film can also have other layers like oxygen barrier, tie, and seal.

Source

Stackable heat-sealable shrinkable film for packaging applications that allows multiple bags to be heat-sealed without fusing. The film has an outer layer containing low molecular weight compounds like paraffin, oleamide, or stearic acid. This layer is crosslinked by electron beam treatment to prevent interpenetration of polymer chains during heat sealing. The inner heat seal layer uses a resin with higher melting point like polyethylene. This allows stacked bags to be sealed without fusing the outer layers.

Source

Single-layer polyethylene film with different properties on the front and back surfaces, allowing it to replace laminated films in packaging. One side of the film is irradiated with an electron beam to crosslink the polyethylene, improving heat resistance and strength. The other side is unirradiated to maintain flexibility. This allows a single-layer film to be used for packaging applications like sealing and containment, replacing laminated films with multiple layers.

Source

Laminated film for packaging that improves heat resistance and recyclability compared to traditional multi-layer films. The film has a base layer made by electron beam irradiation of a polyethylene film to crosslink it. This layer improves heat resistance and strength. The crosslinked base layer is sandwiched between outer and inner layers of regular polyethylene for sealing. The inner layer faces the product being packaged. This allows recycling the outer layer separately from the inner layer since they have different crosslink densities. The inner layer can be recycled with regular PE while the crosslinked outer layer can be recycled with other crosslinked materials.

Source

Laminated packaging film with improved heat resistance and strength. The film has a polyethylene base layer irradiated with electron beam to crosslink the polymer. This layer provides improved heat resistance and strength compared to unirradiated polyethylene. The irradiated layer is sandwiched between two regular heat-sealable polyethylene layers. The irradiated layer is on the outside for improved outer layer properties. This allows the irradiated layer to be located where it needs better heat resistance and strength, like the outer layer of a package. The irradiated layer can also have a light stabilizer and crosslinking agent to further improve properties.

Source

Film, packaging bags, and laminates that have improved recyclability and content hiding properties. The film can be made from biomass-derived polyethylene or polypropylene. To improve strength and heat resistance, the film can have layers of different densities like HDPE, MDPE, and LDPE. One surface can be treated with electron beam irradiation to cure or crosslink the polymer. This creates films with different properties on the front and back. The irradiated side can be used as the base material for packaging. Using biomass-derived polymers, multi-layer structures, and electron beam irradiation allows making recyclable, content concealing films and bags without using different resin materials.

Source

Single-layer polyethylene film with different physical properties on the front and back surfaces. The film is made by electron beam irradiating one surface to crosslink the polyethylene there. This provides improved heat resistance and strength on that side. The unirradiated side has the same properties as conventional PE film. This allows using just the irradiated film as an outer layer for packaging instead of a laminate. It also enables making sealed bags and pouches from the irradiated film folded inside.

Source

Recyclable packaging films for products like food and beverage that have improved mechanical properties and heat resistance compared to conventional recyclable films. The films are made by orienting and irradiatively cross-linking polyethylene (PE) films. This process improves the films' clarity, shrinkage, and heat resistance compared to unmodified PE films. The recyclable films can be used in multilayer packaging structures for products like stand-up pouches.

Source

Chemical-resistant high-density polyethylene (HDPE) with improved chemical resistance compared to standard HDPE. The chemical-resistant HDPE is prepared by crosslinking HDPE with xanthan gum, polyarylethylene, and inorganic additives. The crosslinking agents form chemical bonds between the HDPE molecules, increasing bond energy and density. The inorganic additives disperse in the HDPE matrix and change molecular orientation to enhance crystallinity. This dense structure with reduced amorphous areas provides better chemical barrier properties compared to standard HDPE.

Source

Recyclable food packaging films made from oriented and crosslinked polyethylene (PE) that provide improved mechanical properties and heat resistance compared to conventional PE films. The films are made by orienting and irradiating PE to create crosslinks. This improves stiffness, heat sealing performance, and clarity compared to unoriented PE. The films are recyclable since they contain PE. The crosslinked PE films can be used in packaging applications like stand-up pouches for food and beverages.

Source

A high strength, high heat resistance, and recyclable polyethylene-based packaging material. The material is made by stretching and irradiating a polyethylene film to improve its properties. The resulting base material is then laminated with another polyethylene layer to create a laminate with enhanced strength and barrier properties compared to conventional polyethylene laminates. The laminate can be used as a packaging material that is both strong and recyclable. The key features are using a stretch-irradiated polyethylene as the base layer, a second polyethylene layer as the heat seal layer, and a barrier coat layer if desired.

Source

Laminate for packaging materials with improved strength and recyclability. The laminate has a base material and a heat seal layer, both made of polyethylene. The base material is electron-beam irradiated to increase strength. The heat seal layer is thicker. The electron-beam irradiation converts the polyethylene chains to crosslinked regions, improving strength. Using the same polyethylene material for both layers allows recycling the laminate as pure polyethylene.

Source

Laminate for packaging materials with improved strength, heat resistance, recyclability, and content resistance compared to conventional laminates. The laminate has a base material, a dry laminate layer, and a heat seal layer. The base material is made of polyethylene that has been stretched and electron beam irradiated. The dry laminate layer is also polyethylene, containing components derived from unsaturated carboxylic acids. This layer bonds closely to the base material. The heat seal layer is also polyethylene. The laminate provides better strength, heat resistance, and recyclability compared to conventional laminates where the base and seal layers are made of different materials. The improved strength and heat resistance are from the stretched and irradiated base material. The improved recyclability is from using the same polyethylene for all layers. The improved content resistance is from the unsaturated car

Source

Packaging material that is recyclable because it is made from a single material, polyethylene, for both the base and heat-sealing layers. The base layer is stretched and irradiated with electrons to improve strength. The heat-sealing layer is also polyethylene. The stretching and irradiation process crosslinks the polyethylene to enhance properties like strength and heat resistance. The monolayer construction allows easier recycling compared to multi-material laminates.

Source

Base material for packaging applications that provides high strength, heat resistance, and recyclability. The material is a stretched polyethylene film with at least one surface irradiated by electron beam. This improves crosslinking density and properties. The material can be used as a standalone outer layer or laminated with other layers like heat seal layers. The electron beam treated polyethylene provides better strength and heat resistance compared to conventional polyethylene films. This allows using it as a base material for packaging without needing different resins. It also enables recycling the entire packaging by having a single resin type. The laminated structure can further improve strength and barrier properties. The base material can also have a multi-layer structure with different densities of polyethylene. This maintains stretchability while enhancing properties.

Source

A base material for packaging applications that provides high strength, heat resistance, and recyclability. The base material is a polyethylene film that is stretched and one surface is electron beam irradiated to increase crosslinking. This improves properties like strength and heat resistance compared to unmodified polyethylene. The irradiated side can face outwards for packaging applications. The film can also have multiple layers with different densities to balance stretchability and strength. The base material can be laminated with other layers like heat seal layers and barrier coatings for complete packaging structures.

Source

A single-layer polyethylene film with different properties on the front and back surfaces for packaging applications. The film is made by electron beam irradiating one surface to cure or crosslink the polyethylene. This creates a surface with improved heat resistance and strength compared to the unirradiated side. The irradiated surface can replace the outer layer of a laminated film, allowing single-layer packaging. The irradiated film can also have better printability due to improved wettability.

Source

Recyclable films for food packaging that provide improved mechanical properties and heat resistance. The films are made by orienting and irradiatively cross-linking polyethylene. The films can be used in stand-up pouches and other packaging structures. The irradiation creates cross-links in the outer surface of the film to improve heat resistance without adding chemicals that would make the film non-recyclable. The irradiation conditions are around 2-24 MRads. This allows using recyclable polyethylene films with better properties for packaging food and beverages that can be heat sealed and recycled.

Source

Flexible packaging substrate with thermally stable digital prints obtained by electron beam irradiation. The prints are made by liquid electrographic printing using conventional inks without UV or electron beam curing groups. The inks are then crosslinked by electron beam irradiation to provide thermal stability for heat sealing applications. The key is irradiating the prints to a dose of 18 kGy or higher to fully crosslink the inks and eliminate defects like ink removal, shrinkage, and gloss change at high temperatures. The crosslinked inks have very low concentrations of ethylenically unsaturated groups or alicyclic epoxides (<0.05 meq/g) to avoid softening and flowing during sealing.

Source

Laminate for packaging that is made of polyethylene film only, allowing easier recycling compared to laminates with different resins. The laminate has a polyethylene film base layer irradiated with electron beams on both sides, and an unirradiated polyethylene film layer on the other side. The electron beam treatment crosslinks the polyethylene surface, improving properties like heat resistance and strength. This allows the laminate to be sealed and used as a packaging material without needing separate adhesives or layers.

Source

Polyolefin-based resin film that can maintain the interface strength of each layer even when subjected to a high-temperature heat treatment such as °C and suppress peeling of a propylene resin layer and an ethylene resin layer, and a package for heat treatment using the same. The film includes a polyolefin resin composition satisfying the conditions, a polymerized block copolymer polymerized using a metallocene catalyst, and a ethylene resin composition.

Source

Recyclable packaging films for high performance applications like food packaging that are recyclable in the polyethylene stream without requiring additional compatibilizers. The films have a base film of oriented, annealed, and crosslinked polyethylene with a low shrinkage rate below 10% in both directions when heated. The base film is sealed with a compatible polyethylene sealant. The crosslinking improves heat resistance and reduces sticking compared to uncrosslinked films. The films are recyclable in polyethylene streams because the crosslinking prevents separation of the polyethylene chains.

Source

Polyethylene laminated film for recyclable packaging that can be made entirely from polyethylene instead of multiple resins. The film has a polyethylene base layer irradiated with electron beams on both sides to increase crosslinking. The other layer is unirradiated polyethylene. The electron-beam irradiation improves the film's heat resistance. The outer layer not irradiated with beams is heat-sealed for packaging. This allows recycling since it uses only one type of polyethylene resin. The irradiated base layer provides crosslinked strength and heat resistance while the unirradiated outer layer allows sealing.

Source

<Laminate> The laminate according to the present invention comprises a polyethylene film base material and a polyethylene film layer, and the polyethylene film base material is irradiated with electron beams on both sides and contains polyethylene and a cross-linking agent. It is characterized in that at least one side is not irradiated with an electron beam. Further, in the laminate according to the present invention, the polyethylene is selected from the group consisting of low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, and a copolymer of ethylene and another monomer. It is preferably at least one type. Further, in the laminate according to the present invention, the content of the cross-linking agent in the polyethylene film base material

Source

Method for producing multilayer plastic webs with a layer of foamed plastic and a cover layer. The method involves coextruding the layers through a slit die and cooling the multilayer web using aerosol or liquid contact. This allows using recycled materials in the foamed plastic layer. The recycled content can be at least 30% by weight. The foamed plastic layer is made by extruding and homogenizing the melt, followed by crosslinking. This sequence improves properties like crystallinity and molecular weight.

Source

A method for making flexible packaging materials with improved ink durability and bond strength. The process involves printing an ink containing a thermoplastic resin on a flexible substrate, followed by applying a crosslinking composition to the ink. The crosslinking agent is activated to form crosslinked thermoplastic resin and potentially crosslinked primer resin. This improves ink durability by preventing fading and reduces delamination between layers during heating processes like pasteurization.

Source

Recyclable films for packaging products like food and beverages that have improved mechanical properties and heat resistance compared to conventional recyclable films. The films are made by orienting and irradiatively cross-linking polyethylene. The oriented and cross-linked polyethylene films have better properties like heat resistance, clarity, and shrinkage compared to unoriented films of the same composition. This allows using recyclable films for applications like stand-up pouches that require higher performance. The films can be used in multilayer structures with sealant layers for packaging. The films can be made by extruding, orienting, and irradiating polyethylene.

Source

Polyethylene-based crosslinked shrink film for packaging refrigerated and frozen noodles that allows easy opening after microwaving while sealing during storage. The film has a heat seal strength when sealed at 120°C, 0.65 MPa of 2-10 N/30mm, and at 120°C, 2.0 MPa of 12-20 N/30mm. This allows the seal to open when microwaved to release steam without bursting. The film can be made by blending low-density polyethylene resin with additives like glycerin monooleate.

Source