Emerging Technologies in Oriented PET (O-PET) Packaging

Biaxially oriented polyester film with non-slip surface, transparency, and easy winding for use in packaging applications like food containers and top seals. The film has two layers, A and B, both containing polyethylene terephthalate (PET). The dynamic friction coefficient of the A layer surface, the friction coefficient between A and B layers, and the haze are controlled within specified ranges to balance slipperiness, transparency, and processability. The film's non-slip surface prevents stacked containers from collapsing when pressed together.

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Clear, rigid medical packaging that can be sterilized by autoclave steam without warping or shrinking. The packaging is made by extruding a crystalline thermoplastic like PET, then partially stretching the film, heating it, and thermoforming it into the final shape. This process limits crystal growth to small spherulites rather than large crystals that cause warpage. The film is then sealed around the device and steam sterilized. The spherulitic crystals provide clarity and strength, but the restricted crystal growth prevents warping during sterilization. The packaging can be made by coextruding layers of different thicknesses that are split and stacked by multiplier units to form the final multilayer structure.

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Stretched multilayer film for packaging with improved mechanical strength, heat resistance, and barrier properties. The film has alternating layers of PBT (polybutylene terephthalate) and PET (polyethylene terephthalate) without an adhesive layer. The PBT and PET layers have reduced copolymer contents to maintain compatibility and avoid curling during stretching. The film can be produced by coextruding PBT and PET layers and then stretching them using a tenter system. This allows the film to have both the toughness of PBT and the heat resistance of PET.

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Stretched multilayer film with improved mechanical strength and heat resistance compared to conventional films. The film has layers of polyethylene terephthalate (PET) and polybutylene terephthalate (PBT) with a heat-sealable resin layer. The PBT content is limited to 25-45% of the total layers. The PBT, PET, and heat-sealable layers are coextruded without adhesives. The film has high puncture strength per thickness and is useful for packaging bags. The coextrusion and stretching process allows simultaneous formation of the layers without separate lamination steps.

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Stretched packaging film with improved quality and reduced environmental impact by using chemically recycled resin instead of material recycled resin. The stretched film contains a chemically recycled resin, which is made by converting discarded resin into monomers and then polymerizing them. This reduces foreign matter and odors compared to material recycled resin. The chemically recycled resin in the film is less likely to have gels, aggregates, or odors after heat treatment. This improves film quality and appearance when stretched.

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A multilayer film for lid seals on food containers that balances antifogging, easy opening, impact resistance, and blocking resistance. The film has at least two layers, a base layer made of biaxially oriented polyester, and an antifogging layer coated on top. The base layer improves impact resistance and prevents tearing during opening. The antifogging layer prevents fogging and condensation inside the container. The film also has good blocking resistance to prevent jamming during roll storage. The biaxially oriented base layer provides the required properties.

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Packaging laminate with improved tear resistance and recyclability while maintaining barrier properties. The laminate has a thin stretched plastic film as the barrier layer instead of a thicker conventional plastic film. The stretched plastic layer is less than 10 microns thick and has low elongation at break. This allows the paper carrier layer to dominate the tear propagation for easier opening and reduces plastic contamination. The thin stretched plastic provides sufficient barrier properties. The laminate can be recycled like paper due to the paper base.

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Thin, high-resistance polyester film for packaging foods, medicines, and industrial products that provides excellent bag-breaking resistance while maintaining transparency and printability. The film is made by biaxially orienting a blend of 80-100% PET and 0-20% other polyester resin. The film has a specific degree of planar orientation, puncture strength, and elongation ratio. The thin film thickness is 6-10 μm. It has low haze and friction. The film can be laminated with a sealant film for improved sealing properties.

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A low-cost, small-size, environmentally friendly packaging structure for refrigerators that prevents moisture, mold and damage compared to traditional paper boxes. The packaging uses a sealed plastic wrap around the refrigerator's exterior instead of a large paper box. The refrigerator sits on a bottom seat, has a cover, and vertical sides enclosing an interior space. The plastic wrap is shrunk onto the exterior after heating to seal the refrigerator inside. This avoids moisture, mold and damage issues that paper boxes have. Additional strapping bands can be wrapped around the exterior for additional strength and grip during transportation.

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Laminated metal sheet for packaging applications with improved adhesion and barrier properties compared to conventional methods. The laminated metal sheet has a predominantly uniaxially oriented laminate layer with an adhesion layer containing a specific copolyester and a bulk layer of poly(ethylene terephthalate). The laminate layer is preheated before application to provide initial adhesion, then post-heated without melting the bulk layer. This produces a specific Euclidean distance matrix between ATR FTIR spectra. The uniaxial orientation reduces deformation during forming. The specific copolyester in the adhesion layer improves adhesion to the metal. The post-heating prevents crazing and delamination during forming and opening.

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Heat shrinkable film, label, and packaging material with improved properties for heat shrinking containers. The film has a copolyester resin with controlled crystallinity. The crystallinity is adjusted to have a specific difference in reversible heat capacity before and after the glass transition temperature. This provides better balance between thermal properties like shrinkage and chemical resistance compared to conventional polyester films. The film can be made by preparing the copolyester, casting it into a film, and then heating and stretching it to set the crystallinity.

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Laminate structure for packaging containers that improves gas barrier properties and adhesion between layers compared to traditional polyester/polyethylene laminates. The laminate has a stretched polyethylene substrate with a surface resin layer containing a high melting point resin like PET. This improves adhesion of subsequent vapor deposited layers, resulting in better gas barrier properties.

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Stretched multilayer film with reduced curling during manufacturing and improved mechanical properties for packaging applications. The film has a symmetrical layer structure with alternating PET and PBT layers. This prevents curling during stretching since the layers expand at similar rates. The film has high puncture strength and heat resistance. The layers are formed by coextrusion and simultaneous stretching. The PET and PBT interfaces are bonded without adhesive. This allows offsetting the crystallization density difference between PET and PBT to prevent curling during stretching.

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Biaxially oriented polyester film containing chemically recycled polyester with low melt resistivity to prevent pinner bubbles during production. The film has 20-95% chemically recycled polyester and an alkaline earth metal-phosphorus ratio of 1.0-5.0. It reduces environmental impact by using recycled polyester and allows high film production speed without bubbles. The film can be used in laminates for packaging containers.

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Biaxially oriented polyester film with improved strength and reduced breakage during production, containing chemically recycled polyester with specific properties. The film has an intrinsic viscosity of 0.50-0.70 dl/g and melting point of 251°C or higher. This reduces stress during stretching and prevents film breakage. The chemically recycled polyester content is 20% by mass or more. The film can be used in laminates and packaging containers. The recycled content reduces environmental impact.

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Manufacturing device for eco-friendly food packaging trays that are easily separable and disposable. The tray frame is made of paper and a stretched synthetic resin film is attached to the inside. This provides waterproofing and allows sealed packaging using thermoplastic film. The paper tray is formed in a molding process and the synthetic resin film is applied using heated molds. The film is stretched and coated on the tray surfaces. This allows easy separation of the tray and film for recycling.

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Stretched film for packaging applications with improved tear resistance and barrier properties compared to existing stretched films. The film is uniaxially oriented in the machine direction with a stretch ratio of 1.2 to 1.75, preferably 1.3 to 1.5. This allows the film to be sealable unlike previous oriented films. The stretch orientation improves tear resistance while still allowing sealing. The film can be made of materials like polyethylene or polyester, with layers like barrier materials sandwiched between. The oriented film can be used alone or in laminates for packaging applications.

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A stretched film and container made from a composition with a specific ratio of semi-aromatic polyamide resin and plate-shaped talc. The composition contains 3-55 wt% of talc with an aspect ratio of >18, when talc and semi-aromatic polyamide resin are 100 wt%. This composition provides excellent oxygen barrier properties when stretched. It can be used to make containers like PET bottles with improved oxygen barrier for packaging food and beverages. The talc with high aspect ratio enhances barrier properties. The semi-aromatic polyamide resin improves gas barrier further.

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Biaxially oriented polyester film made from chemically recycled polyester with improved properties compared to using mechanically recycled polyester. The chemically recycled polyester used in the film has specific molecular weight characteristics. It has an intrinsic viscosity below 0.62 dl/g and a low percentage (<3.5%) of low molecular weight components with a molecular weight of 1000 or less. This chemically recycled polyester can be blended with fossil fuel-derived polyester to make the film. The film has reduced environmental impact from using recycled polyester, improved tensile strength, puncture strength, and reduced breakage during stretching compared to using mechanically recycled polyester.

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Gas barrier films, laminates, and packaging containers with improved gas barrier properties, reduced yellowing, and reduced film breakage during manufacturing. The films contain chemically recycled polyester with a specific low molecular weight composition. The chemically recycled polyester has an area ratio of 1.9-5.5% for components with molecular weight 1000 or less in the biaxially oriented film. This balances low molecular weight components for gas barrier properties against reducing yellowing and film strength issues. The films can also have coatings, protective layers, and compositions with oxazoline or urethane groups to further enhance adhesion and barrier performance. The compositions can be used in laminates and containers with improved sealing and barrier properties.

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