Improvements in Cast Polypropylene for Packaging

Polypropylene-based non-stretch sealant film with reduced post-shrinkage after heat treatment compared to standard polypropylene films. The film has pseudohexagonal crystal structure, low crystallinity increase, and small retardation increase after heat treatment. This prevents volume loss and dimensional changes during secondary processing like lamination. The film is useful for packaging materials with improved processability. The packaging material is made by laminating the film onto substrates like biaxially oriented polyamide, polyester, paper, or metal foil. The film thickness is 100 microns or less.

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Polypropylene-based unstretched film with balanced heat resistance and low-temperature sealability for use in packaging materials. The film has a composition with specific ratios of propylene homopolymer and propylene/ethylene random copolymer. It also optionally contains a thermoplastic elastomer. The film structure can have multiple layers. This balanced property profile allows using the film as a sealant in packaging applications like retort processing without compromising low-temperature sealing performance. The film can be used in packaging materials like mono-material packages made of polypropylene.

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Laminate structure for packaging materials with improved gas barrier properties while still using polypropylene for all layers. The laminate consists of a polypropylene base film, a barrier layer with an unstretched polypropylene substrate, gas barrier coating, and deposited film, and a polypropylene sealant layer. This configuration allows using a polypropylene base film for recyclability while still achieving good gas barrier properties with the barrier and sealant layers.

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A thin, single-layer packaging film made of an unstretched polyolefin material that is suitable for wrapping hygiene products like diapers and feminine pads. The film has a thickness of 6-20 micrometers and can optionally have a release coating on one side. The film's thinness reduces material usage compared to thicker films, but without compromising mechanical properties like strength. The film's shrinkage is controlled to prevent issues during processing. The thinness enables easier handling and reduces waste compared to thicker films. The thinness also allows better coating adhesion compared to very thin films.

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A polypropylene-based unstretched sealant film with low post-shrinkage and improved processability for packaging applications. The film has a pseudo-hexagonal crystal structure with low crystallinity increase and retardation increase after heat treatment. This prevents film size changes and deformation during storage and processing compared to stretched films. The film is suitable for packaging materials where it is laminated with other films or foils. The thickness is 100 microns or less.

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In-line thermoforming film container for food packaging that exhibits excellent oxygen and moisture barrier properties, has excellent physical rigidity and antibacterial properties, can maintain the freshness of food for a long time, and can inhibit bacterial spoilage. The container includes a non-stretched polypropylene (CPP) layer, a PE (polyethylene) layer positioned on the top of the non-stretched polypropylene (CPP; casting polypropylene) layer, and the PE (polyethylene) layer.

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A thin, lightweight wrapping package made from unstretched polyolefin film with improved mechanical properties and reduced material usage compared to conventional packaging. The packaging uses a specific formulation and structure of the film layers. The main layer is a 20-49% propylene homopolymer or copolymer blend with high VICAT temperature (130°C) to provide strength and heat resistance. The film can be monolayer with a thin release coating or a multi-layer structure with thin inner layers. This allows reducing total film thickness to 6-20 microns while maintaining strength and handling.

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Multilayer film with improved gas barrier property and moldability without requiring stretching. The film has alternating layers of crystalline and amorphous polymers. The crystalline layer contains a thermoplastic resin with crystallinity, and the amorphous layer contains a different thermoplastic resin. The thicknesses of the crystalline and amorphous layers are precisely controlled within certain ranges. This layer structure allows the film to have both high gas barrier properties and moldability without needing stretching. The multilayer film can be used as-is or molded into containers with internal storage areas without losing gas barrier performance.

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A multilayer film, molded film, and package with both improved gas barrier properties and molding processability without the need for stretching. The film has alternating layers of a crystalline thermoplastic resin A and a different thermoplastic resin B. The crystalline resin A forms anisotropic crystals with molecular chains oriented horizontally in the film plane. This gives the film gas barrier properties. The thermoplastic resin B provides processability. The horizontal crystal orientation allows the film to be molded without stretching.

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Automated wrap production machine that eliminates the need for separate preparation of the raw material and improves efficiency and waste reduction compared to conventional wrap manufacturing processes. The machine has a raw material production unit, raw material supply unit, casting unit, film winding unit, roll compression unit, and roll cutting unit. The raw material is produced, supplied, cast, wound, compressed, and cut all in the machine. This allows automated, continuous wrap production with a roll that can be cut to size for packaging. The cut scraps are recycled to make new wrap material.

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Flexible, self-standing produce pouch made of high-clarity cast polypropylene film that provides improved clarity, temperature tolerance, and cost-effectiveness compared to prior art pouches made from coextruded or laminated materials. The polypropylene film allows high clarity without sacrificing strength or durability. It also better tolerates temperature variations. The self-standing design allows upright display to save space and prevent damage. The pouch can be heat sealed without lamination or coating.

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A packaging material made of a polypropylene film that has excellent opening properties like easy tearing, high transparency, and low odor generation. The film is a non-stretched laminated structure with a base layer made of a specific propylene homopolymer and an organic nucleating agent, and a surface layer containing a propylene-α-olefin copolymer. The base layer provides the tearability and the surface layer improves appearance. The specific propylene homopolymer in the base layer has a high melting point and the organic nucleating agent improves tearability even in heated environments. The laminated structure allows good opening, transparency, and low odor compared to stretched films or blends.

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