Heat Sealing for Package Integrity

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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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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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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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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Smart heat sealing method for vacuum packaging that allows faster heat sealing without overheating issues. The method calculates the optimal sealing time based on the time constant of the vacuum packaging machine and coefficients derived from the heating rate and temperature change of the sealing area. This allows customizing the sealing time based on the specific machine and materials to prevent overheating while still achieving proper sealing. The coefficients are precomputed and stored in a database.

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Packaging laminate with reduced resin content that improves seal strength and reduces pinholes compared to using just calcium carbonate in the sealant layer. The laminate has a sealant layer with two sublayers, an inner sublayer containing calcium carbonate and a lower calcium carbonate content outer sublayer. This gradient reduces resin use while maintaining seal integrity. The inner sublayer with higher calcium carbonate provides strength, and the outer sublayer with lower calcium carbonate allows better heat sealing.

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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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Heat-resistant varnish for coating heat-sealable packaging materials like polyethylene films. The varnish composition contains soluble nitrocellulose, wax, silica, and an organic solvent. The wax content is 0.5-3.0% of the varnish solids, and the silica content is 2.0-11.0% of the varnish solids. This composition provides excellent heat resistance, blocking resistance, and transparency when applied to mono-material packaging materials like polyethylene films. It prevents shrinking and distortion during heat sealing while maintaining transparency and resistance to blocking and abrasion.

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Eco-friendly bubble wrap packaging bag that eliminates the need for adhesive tape to seal the opening. The bag has a flap that extends beyond the top of the second sheet when folded. The flap corners are heat sealed to the main sheet edges. When the flap is turned over, it overlaps the second sheet and blocks the opening. This replaces the tape to seal the bag without requiring tape that can't be recycled. The bag is made by folding a bubble wrap sheet into a flap, heat sealing the flap corners, then overlapping and heat sealing the main sheets.

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Heat sealant for packaging materials used in bags that have overlapping sections like foldable and gusseted bags. The sealant contains a heat sealing material and expandable particles in a mass ratio of 90/10 to 30/70. The expandable particles expand when heated to fill gaps between overlapping sections of the packaging material during sealing, preventing bag leakage. The sealant also has expandable particle characteristics like diameter and expansion temperature ranges to optimize expansion during sealing.

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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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A heat-sealable, vegetable-based, repulpable multi-layer packaging material for food products that is more recyclable and sustainable compared to traditional packaging. The material has a vegetable-based innermost layer made of partially modified cellulose fibers called dialcohol cellulose. This layer contacts the product and is heat-sealed. The outermost layer protects from the environment. The innermost layer composition allows repulpability in the same recycling fraction as cellulose fibers. The vegetable-based innermost layer enables recycling with cellulose fibers instead of separating and recycling plastics.

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A laminate for liquid packaging that provides excellent aroma retention, recyclability, and heat seal strength. The laminate has a stretched polyethylene film, a heat seal layer, a coating layer, and an adhesive layer. The coating layer is a cured coating film made of a polyester polyol derived from ortho-oriented aromatic carboxylic acid and a polyisocyanate. The adhesive layer is also a cured coating film made of the same polyester polyol and polyisocyanate. This laminate can be used in liquid packaging materials like soap, shampoo, and detergent containers. The coating layers prevent odor loss and the adhesive layer enables good heat seal strength.

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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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Custom product packaging made entirely of corrugated cardboard and biodegradable foam without adhesives or tape. The foam is adhered directly to the corrugated surface by heating the corrugated area and pressing the foam against it. The foam used is made of polylactic acid (PLA) which bonds strongly to the heated cardboard. This allows customizable foam protection without additional adhesives or tape. The packaging is fully compostable and reduces waste compared to conventional packaging with separate foam and cardboard pieces held together with adhesives.

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Gas barrier film for packaging applications that provides good adhesion between the base material and the heat seal layer without the need for additional adhesives. The film has a base material made of biaxially stretched polyethylene with probe drop temperatures below 180°C. An inorganic oxide layer or oxygen barrier membrane is formed on one surface. This allows the heat seal layer made of polyethylene to adhere well to the base material when laminated together. The low probe drop temperature of the stretched polyethylene base material promotes adhesion without the need for adhesives between the layers.

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Biodegradable packaging material for securing mobile devices with enhanced biodegradability, heat adhesion, and security. The material has a front film with a heat-adhesive layer and a rear film with a light-shielding layer and another heat-adhesive layer made of biodegradable polyhydroxyalkanoate (PHA) resin. The films are heat-sealed at the edges to form a pack with an opening. The PHA adhesive provides biodegradability and heat sealing. The light-shielding layer can be paper for security. The pack can be sealed around a device camera to prevent use, then signed or printed on the paper. The pack can be biodegradable, recyclable, and rustle-free compared to plastic packs.

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Laminate, film, and packaging material with wide heat-sealable temperature range and high gas permeability. The laminate has a base layer with high content of 4-methyl-1-pentene polymer and a sealant layer with very high 4-methyl-1-pentene polymer content. The melting point of the base layer and the higher of the sealant layer's melting point or glass transition temperature differ by 5°C or less. This configuration provides a laminate with a wide sealing temperature range and the excellent gas permeability of 4-methyl-1-pentene polymers. The laminate, film, and packaging material find uses in applications like tapes, adhesives, bags, and packaging for fresh food, batteries, and cell culture.

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Resin stopper and pouch configuration to prevent film breaking near the spout when heat sealing the stopper. The stopper has a welded portion that attaches to the pouch film. It has ribs protruding from the base that melt before the base. The rib height after melting remains at least 1/6 the original height. This prevents excessive molten resin from flowing to the lower end of the welded portion. The length from the welded portion tip to the rib lowest point should be less than twice the rib pitch. This prevents the seal bar from shifting and abutting. The ribs can have a groove to further prevent molten resin flow.

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Heat-sealable packaging material laminate with improved seal strength and processability by using the same resin in both the base and sealant layers. The base layer is a biaxially oriented polypropylene film with specific properties like high fusion initiation temperature, low heat shrinkage, and high modulus. The sealant layer is unstretched polypropylene with a lower sealing initiation temperature. The key is having a 50°C or higher temperature difference between the fusion initiation temperature of the base layer and the sealing initiation temperature of the sealant layer. This allows high heat sealing temperatures without shrinking or fusing the base layer.

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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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Gas barrier film with improved adhesion for easily recyclable laminates. The film has a base material containing polyethylene and an inorganic oxide layer on one surface. The base material has low birefringence (0-0.007) when measured by a specific technique. This low birefringence ensures good adhesion between the base material and the heat seal layer in laminates made from the film, preventing delamination or bag breakage during use.

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Transparent multilayer film for use in packaging applications like food containers where it is heat sealed to a bottom material. The film has an easy-peel layer containing a hot melt adhesive and an incompatible component. This configuration provides a lid that peels cleanly from the bottom material without delamination or stringing when opened. The film also has low haze for transparency in the package.

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Packaging for food and beverages that allows easy adjustment of sealing conditions when heat sealing the lid. The packaging uses a three-layer lid structure with a lower melting point sealant layer sandwiched between a base layer with a higher melting point and a paper layer. This allows easier control of heat sealing conditions compared to using just the sealant layer directly on the container. The higher melting point base layer prevents excessive softening of the sealant layer during sealing, allowing better adjustment of temperature and time for reliable sealing.

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Gas barrier film for packaging applications that provides a mono-material packaging solution while maintaining strong adhesion between layers. The film has a base material made of stretched polyethylene with a low probe descent temperature (around 170°C) to enhance adhesion to the heat seal layer. An inorganic oxide layer or oxygen barrier membrane is formed on the base material surface. The film can be used in a laminate structure with another polyethylene layer joined by adhesive. The low probe descent temperature base material enables strong adhesion between the layers without delamination.

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Carbon neutral heat-sealable coated film for packaging bags that provides excellent heat resistance, impact resistance, and bending pinhole resistance using biomass-derived materials. The coated film has a base layer of biaxially stretched polyamide film containing biomass-derived polyamides like polyamide 410, 610, and 1010. A seal layer with propylene-based resins is laminated onto the base layer. This allows heat sealing the bags while reducing carbon footprint compared to fossil fuel-based films. The biomass-derived polyamides in the base layer improve bending and pinhole resistance.

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Customizable, monolithic foam containers with improved thermal performance for shipping temperature-sensitive products. The containers are made by joining sections of foam made from polylactic acid (PLA) using heat sealing instead of adhesives. The PLA foam sections can have variable thickness and be cut to size. Inside the container, stand-offs made from PLA foam are attached to create air pockets for added insulation. This allows customized container shapes, sizes, and thermal protection without additional materials or seams.

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Barrier-coated cellulose-based substrate for packaging oxygen-sensitive products like food that enables robust induction heat sealing and provides good gas barrier properties. The substrate has a cellulose base coated with a thermostable polymer layer, then metallized by vapor deposition. This provides initial gas barrier and induction sealing compatibility. The metallization layer prevents permeation of oxygen and moisture. The thermostable polymer layer provides additional barrier and sealing resistance. The coating sequence allows using thin layers of materials with good barrier properties while maintaining sealing and induction compatibility.

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Sewable heat seal laminate for containers that allows resealing after opening without adhesive bleeding. The laminate has a base layer, an adhesive layer, and a heat seal layer. The adhesive layer contains an acrylic copolymer. The heat seal layer contains polyethylene plus polypropylene or polybutene. This prevents tearing and bleeding when resealing. The laminate allows opening the container, peeling off the heat seal layer, and resealing without adhesive issues.

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Improved aluminum-plastic film adhesive for lithium battery packaging that provides better electrolyte resistance and heat sealing strength compared to existing adhesives. The adhesive formulation contains components A and B. Component A includes low melting point polyolefin, acid anhydride monomer, initiator, auxiliary agent, and solvent. Component B has bisphenol A epoxy resin, modified bisphenol A epoxy resin, and solvent. The auxiliary agent contains a triazine ring compound. This composition improves adhesion, electrolyte resistance, and heat sealing compared to conventional adhesives.

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Heat seal paper with improved properties for packaging applications that replaces plastic packaging. The paper has a heat seal layer containing a water-dispersible resin binder and lubricant. The paper has a specific range of stiffness and puncture strength for good sealing performance. The lubricant can be paraffin wax, carnauba wax, or polyolefin wax. The binder glass transition temperature is 0-100°C. The paper has a puncture strength of 10N or more and a Clark stiffness of 0.2-1.0 m2/g. This allows heat sealing while maintaining integrity. The paper can be made from cooked pulp, coated with the heat seal layer, and used to replace plastic packaging.

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Heat-sealing agent for packaging materials that provides low-temperature sealing and recyclability. The heat-sealing agent is a modified polyolefin with maleic acid grafts and a specific molecular weight distribution range of 3.5 or greater. The maleic acid content and molecular weight distribution balance for good low-temperature sealing strength and recyclability. An organic solvent is added to dilute the sealing agent for easier application. The modified polyolefin heat-sealant enables heat-sealing at temperatures as low as 30°C while still providing good seal strength when used on polyolefin films. This allows recyclable packaging materials to be heat-sealed at lower temperatures suitable for refrigerated foods.

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Heat-sealable paper for packaging that provides improved tear resistance, burst strength, and sealing properties compared to conventional papers. The paper has a heat-sealable coating containing a water-dispersible resin binder like styrene-butadiene or ethylene-acrylic acid copolymers. This coating provides the necessary adhesion and sealing properties when heat-sealed. The paper has specific tear strength of 10 mN·m^-2/g or more, specific burst strength of 3.0 kPa·m^-2/g or more, and sealing strength of 2.0 N/15 mm to 10 N/15 mm when sealed at 150°C for 1 second. This enables strong, tear-resistant seals on the paper bags while maintaining easy opening. The coating can contain lub

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Heat-seal paper with improved bag-making properties and a package using this paper. The heat-seal paper has a paper base material with specific elongation properties to prevent tearing, wrinkling, and cracking during bag formation. The elongation at break in the MD direction is 2.0-5.5%. This range allows the paper to stretch enough for bag formation without excessive elongation that could strain the heat seal layer. The paper also has a basis weight of 70-120 g/m2 and a density of 0.6-0.8 g/cm3. The heat seal layer can be a water-dispersible or water-soluble resin coating.

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Heat seal paper with improved tear resistance, burst strength, and seal adhesion for packaging applications. The paper has a water-dispersible resin binder in the heat seal layer that allows easy opening and reduces tearing force. The paper has specific tear strength of 10 mN·m²/g or more, burst strength of 3.0 kPa·m²/g or more, and heat seal peel strength of 2.0 N/15 mm to 10 N/15 mm. The heat seal layer can contain styrene-butadiene and ethylene-methacrylic acid copolymers. This provides a heat seal paper that is difficult to tear and can be easily opened.

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Resealable packaging container with a heat-sealable laminate that can be repeatedly opened and closed. The laminate has a base layer, an adhesive layer, and a heat-sealable layer. The adhesive layer contains an acrylic copolymer. The heat-sealable layer contains polyethylene, and optionally polypropylene or polybutene. This allows the laminate to detach from the container when opened, exposing the adhesive layer. When resealed, the heat-sealed portion transfers to the container, and the exposed adhesive layer reattaches. The polyethylene/acrylic combination provides resealability by forming a gap between layers.

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