Adhesive Bonding for Package Assembly

A polyisocyanate composition for two-component curing applications like adhesives and coatings. The composition contains a specific type of polyisocyanate made by reacting xylene diisocyanate and a diol with a molecular weight of 65-300. This polyisocyanate has lower diisocyanate monomer content compared to conventional polyisocyanates. It provides improved safety and reduced migration concerns in applications like food packaging adhesives. The lower diisocyanate monomer content reduces the risk of unreacted diisocyanate remaining in the final product.

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Adhesive structure for packaging boxes that improves adhesion strength between side plates by using different adhesives with complementary properties. The structure involves two adhesive types, like hot melt and water-based emulsion, applied side by side on the side plate folding surfaces. An adhesive hole is formed between the adhesive sections. The holes are filled with either adhesive type to increase adhesion area. This leverages the advantages of each adhesive type, like heat resistance vs water resistance, while mitigating their weaknesses.

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Reducing air bubble formation in laminated films used for packaging containers like pouches and lids. The method involves coating one film with a solventless adhesive using a specialized roll coating device. The coated film is then laminated with the other film while sandwiched between them. The coating device has a configuration with rolls and transfer rolls to precisely apply the adhesive. The adhesive has specific viscosity and components like a polyester resin and aliphatic isocyanate curing agent. This allows controlled adhesive layering and bonding to reduce air trapped between films and prevent orange peel appearance in the laminated film.

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Two-component curing adhesive composition and laminate made using it that combines recyclability and biodegradability. The adhesive composition contains an oil/fat with an acid anhydride group and a curing agent containing an acid-modified polyol and an amine compound. The oil/fat provides the adhesive strength when cured. The modified polyol and amine compound catalyze the reaction between the acid anhydride group and hydroxyl groups to form a crosslinked network. This allows a recyclable and biodegradable adhesive for laminating films.

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Automated machine for making pouch packages with cushioning. The machine converts sheets into a strip of expanded dunnage and then folds it into a pouch. The conversion step involves layering an upper cover sheet, lower cover sheet, and expanded slit sheet with adhesive between them. Pressure is applied to bond the cover sheets together. The folded pouch is formed by creasing the strip, applying adhesive to the edges, and compressing them to seal.

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Eco-friendly and biodegradable packaging material made from cellulose cushioning elements connected together. The packaging consists of multiple cellulose cushioning elements sandwiched between top and bottom cellulose sheets. The cushioning elements have folds and are formed into shapes. The cellulose sheets connect the cushioning elements. The cushioning elements are connected by flexible links when arranged in a line. This prevents scattering during shipping. The packaging can be made by filling pockets with cushioning elements, applying adhesive slurry, drying, and bonding the sheets. It can also be made by compressing and twisting cellulose sheets.

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Two-component room temperature curing adhesive with improved adhesion to a wide range of base materials. The adhesive consists of a polyisocyanate composition (X) with a viscosity of 20-180 mPa s at 50°C, and a polyol composition (Y) with a viscosity of 20-180 mPa s at 50°C. This allows the adhesive to cure at room temperature with good adhesion to various substrates.

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Polyurethane polyisocyanate for adhesives with reduced yellowing and brown color formation when the isocyanate content is removed. The polyisocyanate is synthesized in two steps. In step 1, a diisocyanate and polyol react without catalysts to form a prepolymer with residual diisocyanate. In step 2, the prepolymer is distilled to remove the unreacted diisocyanate. Sodium and magnesium are added to the prepolymer before distillation. The resulting polyisocyanate has low diisocyanate content and sodium/magnesium ratios of 2-70. This reduces yellowing and brown color compared to normal distilled polyisocyanates.

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Biodegradable adhesive composition for packaging bags that has low melt viscosity for partial coating, biodegradability, and thermal stability. The adhesive contains a biodegradable thermoplastic polymer (A), a tackifier resin (B), and a wax (C) in specific proportions. The composition has 50-70 parts A, 20-50 parts B, and 0.01-10 parts C per 100 parts total. The adhesive has a melt viscosity at 180°C of 50,000 mPa·s or less. This allows partial coating and prevents blocking. The adhesive can be used in packaging bags made of biodegradable materials.

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Two-liquid curable adhesive for laminating materials like packaging films that has reduced isocyanate residue compared to traditional adhesives. The adhesive contains a polyisocyanate composition with a specific blend of isocyanate monomers and a polyol composition. The isocyanate composition has a low-molecular-weight isocyanate monomer with 140-280 molecular weight blended at 0.001-0.1% by mass. This reduces the residual isocyanate in the cured adhesive. The polyol composition contains polyols and amines. The specific blend of low-molecular-weight isocyanates allows faster curing of the adhesive while minimizing residual isocyanates.

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Gas barrier film for packaging that improves adhesion to other layers when laminated. The film contains a resin with a carboxyl group-containing polymer and a dehydration-condensation heteroatom compound. It optionally has adjacent layers with a polyvalent metal compound and/or an oxide, hydroxide, or nitride compound. The film provides high gas barrier properties and enhanced adhesion to laminated layers compared to conventional gas barrier films.

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Waterproof battery pack for electric vehicles that prevents water ingress and maintains thermal management. The pack has a multi-component enclosure with sealed modules, cases, and plates to surround and protect the battery cells. The enclosure seals are achieved using a dispensed sealant that bonds and cures over time. A gasket between the electrical component module and top case allows servicing. Pressure relief vents prevent overpressure inside the pack. The enclosure stiffness is provided by metal plates and fasteners.

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Product packaging material with high paper content and transparency to reduce plastic use. The packaging has a pouch formed between a main sheet of unlaminated paper and a transparent front sheet made of either film or cellophane. They are bonded together using water-based adhesive. The paper weight in the packaging exceeds 50% or 60% to increase recyclability. The transparent front allows product visibility while reducing plastic content compared to fully plastic packaging.

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Heat-sealing paper for packaging products like press copies that can be sealed using lower temperature heat than traditional plastic films. The paper has a layer of hot-melt adhesive deposited discontinuously over the entire length and width of the cellulose fiber layer. This creates a network of hot-melt bundles that bond together when heated above 80°C. This allows sealing without needing specialized machines for adaptive packaging. The discontinuous adhesive deposition avoids the need for removing water from water-based adhesives.

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Eco-friendly food packaging containers made from recyclable polyethylene terephthalate (PET) that have improved sealing and adhesion properties with cover films. The containers have a hot melt adhesive layer containing ethylene vinyl acetate and a low melting point copolyester on the flange. This allows better bonding between the PET container and cover film compared to the PET material alone. The adhesive layer contains more low melting point copolyester on the outer flange and less on the inner flange to balance adhesion and sealing properties. This enables effective sealing and adhesion of the cover film to the PET container.

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Heat-sealing paper for packaging solid products like press copies that allows sealing without the need for plastic. The paper has a layer of cellulose fibers and a layer of hot-melt adhesive. The hot-melt adhesive is discontinuously coated over the entire width and length of the cellulose layer. The uneven distribution of hot-melt deposits creates interconnected areas that bond well enough for sealing without forming a watertight seal. This allows packaging solid products without modifying machines for different product sizes. The hot-melt adhesive has a melting point above 80°C. The paper is manufactured by continuously coating hot-melt on the cellulose layer, cooling, and winding.

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A food packaging box with an adhesive guide that significantly reduces assembly time and difficulty compared to traditional boxes. The box has a bottom, top, rear, front, and sides with a fixed incision line on the front. The side panels have an attachment surface and a pillar surface divided by the adhesive guide line. The connection part between the top and front adheres to the fixed incision. The bottom, rear, and front panels also have adhesive areas. This allows the box to be assembled by aligning and sticking the adhesive areas without tape or tools.

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Packaging laminate material, outer layer adhesive, and a method for producing the same that uses environmentally friendly materials. The packaging laminate has an inner layer film, outer layer film, aluminum foil, inner adhesive, and outer adhesive. The outer adhesive is a polyurethane made from an eco-friendly polyester polyol derived from recycled polyester or biomass raw materials. The polyol has a weight average molecular weight of 25,000 to 75,000, number average molecular weight of 18,000 to 55,000, and glass transition temperature of -30°C to 60°C. The isocyanate component is an adduct of toluene diisocyanate and a C4-C15 polyol.

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A solventless two-component adhesive for packaging materials that provides excellent adhesion to metal foils and metal deposition layers. The adhesive contains a polyisocyanate composition with a specific polyisocyanate compound and a polyol composition containing a polyol and a compound like dimethylolpropionic acid or dimethylolbutanoic acid. The adhesive can be used to laminate base materials without volatile organic solvents, reducing environmental impact and improving worker safety compared to traditional solvent-based adhesives. The adhesive cures when the two components are mixed and applied to the base materials before bonding.

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Hot melt self-adhesive composition for resealable packaging with improved adhesive properties and quality of rupture. The composition contains specific ratios of tackifying resins and styrenic block copolymers. The tackifying resin is a non-hydrogenated tackifier derived from aliphatic hydrocarbons like C9 aromatic hydrocarbons. The composition also has a C2/C4 copolymer with >80% C2 content and a C2/C3/C4 copolymer. The composition is used in multilayer films for resealable packaging with improved adhesion, sealing, and rupture characteristics.

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