Heat Sealing for Package Integrity

A device and method for producing reliable can lids with improved joint strength and reduced defects. The device has two pressing tools that apply force to join the metal lid element and polymer components. During pressing, an alternating electromagnetic field is applied using an inductor in the press area. This stabilizes the temperature and prevents warping or deformation of the materials during pressing. One tool can have a channel for a temperature maintenance fluid to further stabilize its temperature. This prevents defects like misalignment, gaps, or incomplete seals that can occur during fast pressing.

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A laminate with enhanced recyclability and heat resistance for food packaging. The laminate has three layers: a heat seal layer, a stretched polyolefin film, and a coating layer containing a composite resin. The composite resin has segments: a polysiloxane segment and a vinyl polymer segment. The segments condense during processing to form bonds. This composite resin enhances adhesion between the layers. The laminate structure allows recycling of the outer polyolefin film and the inner heat seal film separately. The coating layer improves heat resistance compared to using just the outer polyolefin film.

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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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Packaging bag with a spout that can be easily reused and a manufacturing method to join the spout and bag without gaps. The spout and bag are made of the same propylene-based polymer. To join them, the spout attachment area is heat-sealed at a higher temperature than the rest of the bag. This prevents overheating and melting of the bag material. Then the rest of the bag is heat-sealed at a lower temperature. This allows reliable joining without gaps or delamination. The higher temperature step integrates the spout into the bag seal. The lower temperature step joins the rest of the bag.

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Laminated packaging material with high gas barrier properties for food and pharmaceutical packaging that is environmentally friendly, processable, and convenient. The packaging has a mono-material construction with a polyolefin-based substrate, an adhesive layer, and a heat-sealable layer. The substrate is a laminated film with a gas barrier layer made of either an organic coating or an inorganic thin film. This provides initial barrier improvement. The overall packaging further improves barrier after heat sealing and twisting/bending due to the adhesive and heat-sealable layers. The organic coating can be reduced for sustainability and processability versus the inorganic layer, but the coating still provides some barrier. The laminated substrate with the initial barrier layer reduces overall material thickness compared to multi-layer packs.

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Low opacity, biodegradable, and heat-sealable paper made from cellulose fibers coated with a bio-based wax to reduce opacity and improve barrier properties. The paper has a base sheet of refined softwood cellulose fibers with a basis weight of 10-25 g/m2. It is coated with a transparency agent like a coconut-based wax and a heat-sealable coating like a thermoplastic starch or protein. The coated paper has opacity less than 35% and can be used for packaging without supercalendering.

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Non-oriented film for heat seal packaging applications that balances low-temperature sealing properties and heat seal strength. The film has a sealant layer containing propylene-based polymer (A) with melting point 120-170°C and an optional copolymer (B) with lower melting point. The substrate layer has propylene-based polymer (C) with lower melting point. This composition allows the film to form laminated structures with good low-temp sealability and heat seal strength. The films can be used in mono-material packaging without deteriorating substrate heat resistance.

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Eco-friendly laminated film for packaging applications that maintains barrier properties and bonding strength after heat sterilization. The film has layers: an outermost stretched PP film, a barrier coating of modified PVA, an adhesive layer, an inner stretched PP film, and a heat seal layer of unstretched PP with lower melting point than the outermost layer. The barrier coating contains modified PVA crosslinked with organosilane compounds. The inner PP film has a lower melting point than the outermost film. This configuration allows the film to retain gas barrier and adhesion after heat sterilization.

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A transversal sealing system for roll-fed carton packaging machines that improves the sealing quality and prevents over-melting of the packaging material. The system uses an ultrasonic sealing head and pressure plates to seal the carton edges. The ultrasonic head melts the inner layer, an upstream pressure plate prevents bulging, and a downstream plate compresses. This sequential sealing sequence avoids overheating and maintains proper layer alignment.

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Sealing a lidding film to a packaging tray without a knife by using the sealing station's heated surface to both seal and heat the transition area between the clamped and sealing areas. This creates a temperature gradient that increases towards the sealed area. When tension is applied, it separates at the warmest point where the film's strength matches the tension. By heating and stressing the transition area, it allows the lidding film to be separated without a knife.

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Sealing lidding film to a packaging tray using a sealing station with a heated frame that gradually heats the transition area between the film and tray. The lidding film is clamped between the upper and lower tool parts, then the sealing area is heated to fuse it to the tray. Tensile stress is generated in the transition area due to the temperature gradient. The film is separated at the warmest section where the stress exceeds the film strength. This allows sealing without cutting the film and works with all types of lidding films.

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Press-through packaging for medical, food, and consumer products that has improved sealing properties across a wide range of container materials. The packaging uses a specialized heat sealant containing an alpha-olefin-methacrylic acid ester copolymer applied to the lid material. This sealant provides excellent adhesion and sealing with containers made from polyester, polyolefin, fluorine, PVC, and PVDC materials. The versatile sealant allows using a single heat sealant for sealing different container materials, reducing complexity compared to multiple sealants for specific containers.

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A semiconductor packaging technique that improves reliability of power semiconductor packages, particularly for next generation devices like SiC, GaN, and Ga2O3. The technique involves modifying the solder interface between the semiconductor element and substrate to prevent delamination and cracking. The modification involves using a specific solder alloy composition, thin film stack sequence, and solder geometry to reduce diffusion of elements like Ni and Au into the interface. This prevents peeling and degradation of the bond strength between the semiconductor and substrate during repeated heating and cooling cycles. The modified solder interface provides improved reliability for power semiconductor packages operating at higher temperatures and currents.

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Multi-layer film packaging with improved heat-sealing properties and reduced foreign material formation during manufacturing. The packaging uses a multi-layer film with a surface sealing layer made of linear low density polyethylene (LLDPE). The sealing layer contains PTFE polyethylene with a specific molecular weight distribution (Mw/Mn) of 3 to 7. This PTFE-LLDPE sealing layer prevents delamination and adhesion during heat sealing while inhibiting foreign material buildup on the die.

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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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Dry food packaging laminate and bag with improved impact resistance, heat sealability, and bag-making processability. The laminate has a base layer made of a biaxially oriented polypropylene film with high elastic modulus (500 MPa or more at 100°C) to prevent bag deformation during filling. The heat seal layer is mainly polypropylene with an ethylene-α-olefin copolymer having a melting point of 125-145°C and a 973cm-1 peak intensity divided by 973cm-1 peak intensity of 0.1-0.3. This balance of properties provides good impact resistance, low-temperature heat sealability, and bag-making processability for recyclable, environmentally friendly food packaging.

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Packaging film with improved heat seal strength for reduced density packaging materials. The packaging film has a biaxially stretched film layer containing an olefin-based polymer. The film is analyzed by differential scanning calorimetry (DSC) with specific conditions to determine a property ratio. The ratio is ΔH/D, where ΔH is the heat of fusion at an endothermic peak observed in the DSC curve and D is the film density. The film has ΔH/D of 122.0 J/g·cm3 or less. This improves heat seal strength in packaging materials made from the film compared to films with similar density. The reduced density films have better strength and reduced plastic usage.

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Packaging film with improved heat seal peeling energy for food packaging. The film has a biaxially oriented film layer with an olefin-based polymer and filler, and a heat seal layer containing a propylene-based polymer and an olefin copolymer. The copolymer has propylene and an α-olefin (C2-C10) with 20-95 mol% content. The propylene-based polymer can be homopolypropylene or a block copolymer. The copolymer properties, like melting point and MFR, are controlled. The heat seal layer provides better adhesion to the biaxially oriented film layer compared to standard heat seal layers, reducing peeling during package opening.

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Gas barrier film for packaging applications that provides improved adhesion between layers for monomaterial recyclability without sacrificing gas barrier performance. The film has a base material containing a low crystallinity polyethylene and an inorganic oxide layer on one side. The oxide layer sandwiches between the base and a heat seal layer containing polyethylene. This configuration ensures strong adhesion between the layers when sealed, preventing delamination or bag breakage compared to regular polyethylene laminates. The low crystallinity polyethylene in the base allows better adhesion to the oxide layer compared to higher crystallinity polyethylene.

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A carbon neutral heat-sealable layered film for packaging applications. The film has a biaxially stretched polyamide base layer containing a specific polyamide resin derived from biomass, sandwiched between sealant layers. The sealant layers are made of a propylene-α olefin random copolymer with varying amounts of linear low-density polyethylene. The biomass-derived polyamide in the base layer provides heat resistance and impact strength. The sealant layers provide heat sealing and pinhole resistance. The film is carbon neutral since it contains biomass-derived polyamide and the sealant layers have biomass-derived LLDPE.

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