Property Blending for Packaging Materials

Hybrid clamshell container for packaging products that has a base made of a cellulosic material like paperboard and a cover made of a plastic material. The container has a hinged lid that folds over and clips to the sides in the closed position. This allows the strength and recyclability benefits of paperboard for the base while using plastic for the cover to improve durability and stackability. The container can be formed by manipulating a blank with separate paperboard and plastic components that join together.

Source

Stretched film containing a specific blend of two polyamide resins that provides excellent transparency and prevents irregular reflection. The film has a polyamide resin (a1) with diamine and dicarboxylic acid units, 70 mol % derived from xylylenediamine and sebacic acid, blended with a polyamide resin (a2) containing 35 mol % linear alkylene units. The blended film has a mass ratio of (a1) to (a2) from 5/95 to 30/70. This composition allows the (a1) resin to disperse well in (a2) to prevent light scattering. The film can further have a barrier layer with similar (a1) chemistry and the barrier and stretched film should be stretched at the same ratio.

Source

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.

Source

Two-component curing adhesive composition for laminating films and packaging materials that is safer, recyclable, and biodegradable compared to traditional reactive adhesives. The adhesive uses an oil or fat containing an acid anhydride group as the adhesive component and a curing agent containing an acid-modified polyol and an amine compound. The acid anhydride groups in the oil react with the hydroxyl groups in the polyol to cure the adhesive. The curing agent amine catalyzes the reaction and improves curing speed. The oil component allows recyclability and biodegradability compared to traditional reactive adhesives.

Source

Packaging film for bags and pouches that has improved anti-blocking properties to prevent sticking and clogging. The film has one surface with a roughness of 1-10 microns due to blending iron powder into the propylene resin. This roughness reduces friction and prevents sticking compared to smooth surfaces. The iron powder also absorbs oxygen to improve barrier properties. The rough surface can be formed by blending iron powder into the resin at 1-40% mass.

Source

Sealant film for packaging applications that enables recycling of mixed resin materials. The film has a layer containing recycled material with two or more resin types, followed by a separate sealant layer. The recycled layer has small, localized regions with lower transmission compared to the surrounding. These regions have maximum area and aspect ratio limits to prevent clumping. This allows recycling mixed resins while maintaining sealant and mechanical properties.

Source

Coating packaging materials like paper and cardboard with a thixotropic aqueous mixture to improve barrier properties like reducing gas and moisture transfer through the material. The coating composition contains smectite clay, a water-soluble polymer, and a cross-linking agent that links the clay to the polymer. Applying the mixture to a surface and heat treating crosslinks the clay-polymer barrier. This provides coated packaging with improved barrier properties for replacing single-use plastic in produce shipping.

Source

Polypropylene-based packaging material with improved drop impact resistance, blocking resistance, slipperiness, and flavor barrier properties for food packaging applications. The packaging material contains an ethylene-propylene block copolymer with a unique phase dispersion structure. The copolymer has a matrix of propylene-based polymer and spindle-shaped domains made of propylene-based elastomer. The spindle shape provides optimal properties like drop impact resistance, blocking resistance, and slipperiness while avoiding issues like poor flavor barrier or appearance.

Source

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.

Source

Biaxially stretched polyamide film with improved properties for food packaging and alcohol evaporants. The film has a specific composition and structure to balance properties like bending pinhole resistance, puncture strength, dimensional stability, and ethanol penetration. It contains polyamide 6 as the main component, with dispersed particles of a resin like PBAT, PEE, or POE having a maximum diameter of 1 μm or more. This provides plane alignment and crystallization parameters that enhance performance.

Source

A multilayer biodegradable film with improved uniformity, flexibility, and noise level compared to existing biodegradable films. The film has alternating layers of a polylactic acid-based polymer and an aliphatic polyester or aliphatic-aromatic copolymerized polyester. The uniformity of the polylactic acid layers is optimized to 0.2 μm or less. This reduces thickness variations between layers. The film has good balance of properties like flexibility, transparency, and noise level compared to films with only polylactic acid layers. It also has better interlayer adhesion and processing.

Source

A masterbatch for blending PET and PEF resins that enables stable blend molding of PET and PEF without prolonging molding time and achieving fine quality of the resulting molded object. The masterbatch contains a high concentration of PEF as an additive to PET, with specific proportions and intrinsic viscosities. This allows compatibilization of the PET and PEF during processing and avoids quality issues like whitening or strain hardening when blending the resins directly. The masterbatch composition is: PET:PEF ratio of 90:10 mass% or less, and intrinsic viscosity of PEF of 0.50-1.20 dl/g.

Source

Sheet for press-through packaging, like for medicine blisters, with improved properties for environmental friendliness and manufacturing ease. The sheet contains vinyl chloride resin, biomass resin, and a plasticizer. It has a specific storage modulus range of 1-2.6 GPa at 30°C. The biomass resin is a butylene succinate like polybutylene succinate. The plasticizer is epoxidized vegetable oil like epoxidized soybean oil. The vinyl chloride resin has low chlorine content. This composition allows manufacturing press-through packages with biomass content over 10% and reduced bleeding of plasticizers during production.

Source

Packaging film with improved anti-blocking properties for preventing sticking and clogging of filled pouches. The film has at least one surface with a roughness in the range of 1.0 to 10 μm. This roughness is achieved by blending iron powder into the propylene-based resin layer forming that surface. The iron powder not only improves anti-blocking but also provides oxygen barrier properties. Blending iron powder into the resin layer forms a rough surface with a small friction coefficient that prevents sticking.

Source

Resin composition, film, laminated film, and packaging material with improved balance between easy-opening properties and low-temperature heat sealability. The composition contains 5-30% of a butene polymer, 30-55% high-pressure LDPE, and 30-45% ethylene-α-olefin copolymer with specific properties. The mass ratio of LDPE to copolymer is 40:60 to 59:41. The butene polymer has a melting point of 100-130°C, low melt flow rate, and high proportion of low molecular weight components. The composition provides a film with good easy-opening and low-temp sealability over a wide temperature range.

Source

Polyester resin composition for films with improved barrier properties and mechanical strength compared to traditional polyethylene terephthalate (PET) resins. The composition contains a furandicarboxylic acid-based polyester resin (A) and a thermoplastic elastomer (B) containing isophthalic acid, tetramethylene glycol, and butadiene units. The thermoplastic elastomer has specific storage modulus and loss tangent properties at low temperatures. The composition provides balance between barrier properties and mechanical strength for films used in packaging applications.

Source

A process for making biodegradable packaging materials from waste jute bags that has enhanced mechanical strength, water absorption, flame and heat resistance, low thermal conductivity, and high reflectance. The process involves delignifying the waste jute, phosphorylating it, washing, drying, and further treatments like homogenization, sonication, freezing, and lyophilization to modify the jute fiber properties. This results in biodegradable packaging materials with improved functionalities like water absorption, flame retardancy, and low thermal conductivity compared to unmodified jute bags.

Source

Blow molded bottle container with improved thin-wall thickness, drawdown resistance, and burr removal properties. The container has a specific ratio of bio-based polyethylene, high density polyethylene, and linear low density polyethylene. The ratio of bio-based polyethylene to total polyethylene is 20-50%. The ratio of (bio-based + high density):linear low density polyethylene is 40:60 to 60:40. This composition allows thin-walled containers with reduced deformation and burr retention compared to conventional containers. The thin-walled containers have better drawdown resistance and easier burr removal during molding.

Source

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.

Source

Hybrid biocomposite film for food packaging that combines whey protein isolate, chitosan, and silica to improve properties like strength and antibacterial activity. The film consists of a whey protein isolate matrix with added chitosan and silica fillers. The chitosan provides antimicrobial properties while the silica increases strength. The composite films have higher tensile strength and elongation compared to the whey protein isolate film. The chitosan concentration of 1.5% and silica concentration of 5% provide optimal antibacterial properties against E. coli.

Source