Hot Rolling for Package Material Strength

Multilayer packaging film for retort and pasteurization applications that can withstand elevated temperatures without melting or delaminating. The film has a unique layering sequence and shrinkage values to enable high temperature processing. The film has a base layer made of polyolefin film, a second base layer on top with higher shrinkage, and a sealant layer on top with lower shrinkage. The shrinkage values are selected to balance the layers during thermal processing to prevent deformation and delamination. The polyolefin base layers provide recyclability. The inorganic coating on one or both base layers provides barrier properties.

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Barrier films, laminates, packaging containers, and packaged products that have improved adhesion and lamination strength after heat sterilization like retort processing. The barrier film has a base layer containing polypropylene, an anchor coat layer, and an inorganic oxide layer. The base layer has a contact layer in contact with the anchor coat. The contact layer has a lower softening temperature than the anchor coat. This allows the base layer to relax shrinkage stress from the polypropylene during heat sterilization instead of transmitting it to the inorganic oxide layer. This reduces distortion and delamination between the layers after sterilization.

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Reducing distortion in semiconductor packaging to improve reliability and lifespan, especially at high temperatures. The technique involves using composite interfacial materials with controlled thermal expansion properties between the semiconductor device and substrate. The composites have a base material with thermal expansion of 5.5-15.5 ppm/K, coated with lead-free solders on both surfaces. This reduces distortion due to mismatched thermal expansion between the device and substrate materials. The lead-free solders have high melting points of 210°C or higher.

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Propylene-based polymer composition for biaxially stretched films that have improved dimensional stability at high temperatures compared to traditional propylene-based films. The composition contains two or more propylene-based polymers with specific molecular weight distributions. The composition can be used to make biaxially stretched films with reduced shrinkage at elevated temperatures. These films have applications in packaging where high temperature resistance is desired. The composition and films exhibit improved heat resistance without sacrificing other properties like clarity, strength, or processability.

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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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Laminate for packaging that is mainly composed of polypropylene and is unlikely to deform due to heat during bag making and is unlikely to curl due to high-temperature retort treatment. The laminate contains at least a base layer with a stretched polypropylene film and a sealant layer with a polypropylene film. The polypropylene films have MD directions aligned. The stretched base layer's MD shrinkage is 10% or less and the TD shrinkage is 12% or less. This prevents deformation during bag making. The laminate is suitable for retort packaging. The aligned polypropylene films reduce curl during retort treatment.

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A laminate for packaging bags that uses polypropylene for the innermost and outermost layers to enable wider heat sealing temperature tolerance. The laminate has an inorganic oxide layer and gas barrier coating on the inner base layer and/or intermediate layer. This prevents heat shrinkage during sealing while allowing higher temperatures compared to pure polypropylene layers. The laminate can widen the range of heat sealing temperatures for polypropylene-based bags without distortion issues.

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A packaging machine, heating device, and method to improve packaging quality by preventing material damage and maintaining appearance. The machine has an upstream heating section with rollers that bend the packaging material to raise its temperature. This heated material is then fed into the bag maker where it bonds better due to the raised temperature. The heating section prevents floating and damage issues by softening the material before sealing.

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Laminate for packaging applications like retort pouches that has reduced heat deformation and curl compared to traditional laminates. The laminate contains at least 90% polypropylene and has a base layer with a stretched polypropylene film and a sealant layer with a non-oriented polypropylene film. The MD directions of both films are aligned. This alignment and the low thermal shrinkage of the stretched film prevent deformation during heat sealing. The low shrinkage also reduces curling during retort processing.

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Process for making thin plastic food packaging that prevents deformation and wrinkling during forming. The process involves heating the plastic sheet during forming to prevent wrinkling, but also using a forming body to press the sheet against the mold surface. This helps distribute the sheet evenly and prevent deformation. The body is heated to facilitate pressing and seal formation. The thinness of the sheet would otherwise cause deformation during heating. The forming device, mold, and body are configured to prevent overheating and damage to the sheet.

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Biaxially oriented polypropylene (BOPP) film with improved thermal dimensional stability for food packaging applications. The BOPP film has a heat sealing strength of 4.0 N/15 mm or less when heat-sealed at 200°C. This low sealing strength at high temperature improves the film's ability to suppress heat wrinkles during bag sealing and prevent thermal elongation during coating processes. The BOPP film also has a propylene content of 98.0 mol% or more in the biaxially oriented layer. This high propylene content further enhances thermal stability. The BOPP film can be used as a food packaging material, such as a packaging bag, to provide improved thermal dimensional stability compared to conventional BOPP films.

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Biaxially oriented polypropylene (BOPP) film for food packaging that has improved thermal dimensional stability. The BOPP film has a crystalline ratio of 38% or more below 165°C as determined by DSC. This improves dimensional stability during processes like sealing and coating without wrinkling or shrinking. The film also has a main melting point of 165°C or more and 180°C or less, and a heat of fusion of 110-150 J/g. The crystalline ratio below 165°C provides better balance between thermal dimensional stability and formability compared to conventional BOPP.

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Biaxially oriented polypropylene (BOPP) film with improved thermal dimensional stability for food packaging applications. The BOPP film expands in the transverse direction and contracts in the machine direction when heat treated at 120°C for 15 minutes. This reduces wrinkling in sealing areas and prevents thermal elongation during processing. The film has a thermal expansion coefficient of 0.1-2.0% TD and a heat shrinkage rate of 5.0% or less MD when heat treated at 120°C. The BOPP can have a surface resin layer containing propylene homopolymer.

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Packaging films, materials, and food packaging with improved balance of properties like dimensional stability and tear resistance after high-temperature sterilization. The films contain a biaxially oriented polypropylene layer and a surface layer. The key is keeping the amount of structural units derived from α-olefins (excluding propylene) between 1.5-20 mol% when all monomers add up to 100 mol%. This range improves the packaging material's thermal stability and tear resistance after high-retort processing compared to wider α-olefin content ranges.

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Multilayer packaging films that can withstand high temperatures during microwave heating and pasteurization without curling or deformation. The films have specific layer compositions to provide heat resistance and flatness. The core layer is high-density polyethylene (HDPE), the outer layer is polypropylene (PP) and an ethylene-α-olefin elastomer. The HDPE layer prevents curling during heating, while the PP and elastomer outer layer maintains flatness after pasteurization.

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A film laminate for packaging applications that has improved resistance to shrinkage and wrinkling during heat sealing compared to traditional multi-resin laminates. The laminate has an outer heat-resistant coating layer and an inner olefin resin layer. The key to preventing shrinking is reinforcing the olefin layer with the heat-resistant layer. This involves choosing the heat-resistant layer material and thickness to provide enough elasticity to withstand the shrinkage stresses when heated during sealing. The olefin layer and heat-resistant layer elasticity at a specific temperature are compared to ensure the heat-resistant layer provides sufficient reinforcement.

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Packaging laminate, method for selecting it, and method for evaluating it, that reduces deformation due to heat even if made entirely of polypropylene. The laminate has base, intermediate, and sealant layers all made of polypropylene. It contains at least 90% polypropylene. To select a suitable laminate, heat seal at 170°C, 1 MPa, 0.3 sec and measure shrinkage in MD and TD directions. A laminate with MD shrinkage <2.5% and TD shrinkage <2.0% is acceptable. This allows PP-only laminates to have lower deformation during heat sealing compared to multi-material laminates.

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Ink packaging container for writing instruments that can withstand deformation when stored at high temperatures. The container holds aqueous ink with a hydroxyl group-containing organic solvent. The solvent has low vapor pressure at storage temperature. The container contains air and the solvent concentration is 20% or less based on ink weight. This prevents ink expansion due to solvent volatilization when stored in hot environments.

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Packaging laminate and bags made from a monomaterial composite of mostly polypropylene that reduces deformation during heat sealing and prevents curling during retort processing. The laminate has a base layer with a stretched polypropylene film and a sealant layer with a polypropylene film. The films are aligned in the same direction. The heat shrinkage of the base layer films is controlled to be low in the sealing direction and the TD direction. This prevents deformation during sealing and reduces curling during retort processing compared to conventional PP laminates.

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Laminated sheet for food packaging with improved heat resistance and moldability. The sheet has an inner layer containing a specific blend of resin, inorganic powder, and lauric acid diethanolamide. The blended amounts of resin and inorganic powder are balanced to prevent moldability issues when using high amounts of inorganic powder. Adding lauric acid diethanolamide to the inner layer further improves heat resistance without impairing moldability.

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