UV Light Barriers for Food Packaging Protection

Blow-molded containers for food packaging with selective barrier layers to improve shelf life. The containers have a two-part molding process. First, a top portion is injection molded from a single material. Then, a bottom portion with inner, outer, and intermediate sections is molded using a combination of the main material and a barrier material like an oxygen scavenger. The intermediate section with the barrier is positioned between the inner and outer sections. This allows a barrier layer to be concentrated and selectively positioned within the wall thickness. The bottom molding is done after the top to avoid trimming waste.

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Preserving plant parts like seeds, flowers, and leaves by placing them in containers with low oxygen environments to prevent discoloration and enhance germination. The low oxygen environments contain oxygen scavengers like enzymes or chemicals to remove oxygen that can cause pigment degradation. The containers may also have nitric oxide, stably maintained in deoxygenated water, to further promote germination. The oxygen scavengers can be in separate sachets or packets inside the containers. The containers can be made of polymer materials and the scavengers can be applied as films. This preserves plant parts like seeds without drying or freezing them.

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ABSTRACT Grape by‐products, including seeds, skins and stalks, have garnered attention for the development of active intelligent films due to their phenolic‐rich composition. These by‐products contain compounds such as carotenoids, flavonoids, phenolic acids, tannins proanthocyanidins, which exhibit antimicrobial activity against a broad spectrum both gram‐positive gram‐negative microorganisms. They also possess antioxidant properties, UV‐blocking capabilities pH‐sensing characteristics that, when applied packaging, can extend shelf life food. Consequently, from grape is particular importance. This review aims summarize recent studies (2019–2024) on made focusing biological activities responses. The potential application anthocyanins in pH‐sensitive refrigerated packaging noteworthy, making them suitable use with meats seafood. seed extracts demonstrated dual antibacterial effects bacteria, exhibiting dose‐dependent behaviour alongside properties. Additionally, syrup, extract bacterial cellulose displayed minimal UV transmittance while maintaining partial transpar... Read More

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Oxygen removal module for fresh food storage in refrigerators that prevents food spoilage due to oxygen. The module has an electrolyte tank with an air pressure balance port connected to a water tank. The water tank supplements water to the electrolyte tank. This prevents water shortage in the electrolyte tank after long operation due to oxygen consumption. The water tank also has a feeding port with a plug. The electrolyte tank has an oxygen exhaust hole with a floating ball that blocks it when the tank tips over. A pressure release valve is at the top. This allows oxygen removal from the food storage space while preventing water loss issues.

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One of the main challenges facing fresh-cut produce industry is maintaining quality and food safety these products to ensure both consumer satisfaction, which includes not further compromising environment by following global trend toward positive environmental footprints spirit circular economy. Bio-based polymer blend films have emerged as a novel alternative replace traditional plastics due their biodegradability, sustainability, friendliness characteristics. In this work, we evaluated properties gelatin/chitosan composite coatings incorporated with thyme essential oil (TEO) in free form microencapsulated β-cyclodextrin. The incorporation encapsulated TEO enhance blocking against UV–visible light (opacity values 5.25 7.54 for 4% content, respectively) provides excellent vitro antimicrobial antioxidant properties. Films showed improvement tensile strength water vapor permeability, respect both, neat TEO, while exhibited enhanced elongation at break. Encapsulation can slow down release rate from allowing bioactive remain active much longer time. After 12 days refrigerated storage ... Read More

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Fruit spoilage caused by oxidation and microbial infection exacerbates resource wastage. Although starch films including chitosan possessed admirable biocompatibility owing to great biodegradability compared with conventional plastics, deficient antibacterial antioxidant capacity restricted food shelf life. Herein, an environmentally friendly film (CS/G-CDs) was constructed carbon dots derived from Cirsii Herba (CDs), which formed through high affinity resulting hydrogen bonding between molecules hydroxyl originating CDs. The prepared CDs presented homogeneous monodisperse spherical structures ultrasmall size, providing favorable conditions for uniform formation. Encouragingly, the of CS/G-CDs increased 5.00-fold, followed rate up 97.0%. Dramatically, revealed glorious UV shielding efficacy (99.9% UVB 98.2% UVA), its preservation time blueberries remarkably extended 8 days longer than that film. Overall, Chinese herb-derived exhibited magnified antibacterial/antioxidant properties biocompatibility, provided a promising strategy sustainable development packaging materials.

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Plastic containers for food and beverages that have improved shelf life without compromising recyclability. The containers have selective placement of barrier materials like oxygen scavengers near the center to reduce the total amount needed. This allows using less of the expensive barrier materials while still providing the same or better shelf life. By concentrating the barrier materials in certain areas, less overall barrier material is needed compared to uniform distribution. This enables recycling the containers without yellowing issues that occur with high barrier concentrations. The containers are made by selectively injecting barrier materials into specific layers of the preform.

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Packaging film for protecting light-sensitive materials that blocks UV light while allowing visible light transmission. The film has multiple ultra-thin layers with an average thickness of less than 500 nm. The film has a sharp bandedge between UV and visible light ranges. The UV transmission is less than 15% while visible light transmission is greater than 70%. The bandedge slope is greater than 3%/nm. This provides effective UV blocking and visual inspection without color shifts.

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Food packaging film with a light-shielding structure to prevent food deterioration from light exposure during transportation and storage. The film has a base layer, a first light-shielding layer, a second light-shielding layer, bubble films connected to the light layers, and ventilation holes. The light layers block light from reaching the food, the bubble films provide cushioning, the ventilation holes allow airflow, and printing and antimicrobial layers can be added. This balances protection against light, cushioning, airflow, and functionality like printing and antimicrobials.

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A light-blocking packaging blank for food containers that replaces aluminum foil to reduce carbon emissions while maintaining oxygen barrier properties. The blank consists of a sequence of layers: a first PE layer, a base paper layer (optional), a high barrier film, a second PE layer, and a fourth PE layer. The high barrier film and second PE layer are bonded together using an adhesive layer. The base paper layer has indentations on both sides. The second PE layer contains color masterbatch. This structure provides light-blocking properties comparable to aluminum foil while using less material. The high barrier film and base paper indentations improve oxygen barrier properties.

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Protective starch-based film with long-term bacteriostasis and ultraviolet shielding properties for food packaging. The film is made by self-assembly of metallic polyphenol coated zinc oxide nanoparticles and self-polymerization of a melanin-like precursor with starch. The metallic polyphenol nanoparticles provide antibacterial activity, ultraviolet shielding, and mechanical strength. The melanin-like precursor crosslinks the starch and nanoparticles into a network. The film has high ultraviolet shielding, bacteriostasis, and transparency compared to conventional packaging materials.

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Composite polyvinyl alcohol preservative film with low luminous transmittance for light-proof packaging of fruits and vegetables to prevent spoilage and discoloration. The film contains modified silicon dioxide nanoparticles dispersed in a polyvinyl alcohol solution. The modified silicon dioxide nanoparticles have a particle size range of 200-1000 nm. This composite film provides better light-blocking properties compared to pure polyvinyl alcohol film due to the nanoparticles scattering light. The nanoparticles also improve film compactness. The modified silicon dioxide is made by reacting silicon dioxide with a silane compound in toluene, then acid treating. The composite film is prepared by dissolving polyvinyl alcohol in acid, adding the nanoparticles, antimicrobial, and stirring before defoaming

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Active and intelligent food packaging made by grafting curcumin onto polypropylene using reactive extrusion. The curcumin is covalently bound to the polymer backbone to prevent migration. The curcumin in the packaging material provides antioxidant and radical scavenging properties to prevent food spoilage. The packaging also changes color in the presence of ammonia, indicating spoilage. The curcumin-grafted polypropylene has improved UV barrier properties compared to native polypropylene. The reactive extrusion method allows scalable production of the active and intelligent packaging.

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Edible coatings for protecting foods like fruits, vegetables, and processed foods from moisture loss, UV damage, and nutrient leaching. The coatings are made from nanocellulose and nano calcium carbonate. The coatings are edible, transparent, and provide barrier properties against water, gases, and UV light. They prevent moisture loss, prevent UV damage, and prevent nutrient leaching in fruits and vegetables. The coatings can be applied before or after harvest to mitigate post-harvest damage. The coatings can also be used to protect frozen foods from drip loss during thawing.

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A photo-oxygen barrier for packaging materials that protects light and oxygen sensitive products like food, beverages, medications, and cosmetics. The barrier is a composite material containing 1-65% of a light-blocking composition, 1-30% of an active oxygen absorber, and 5-98% of a base material. The light-blocking composition can contain titanium dioxide, aluminum powder, and carbon black. The active oxygen absorber contains cobalt. The barrier can be made by melt extrusion or mixing the components in a base material.

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Light barrier compositions for packaging materials that provide better light protection for sensitive products like milk without sacrificing visual appearance. The compositions contain a blend of polyethylene terephthalate (PET) with other polymers like polypropylene (PP), polylactic acid (PLA), and polymers with heteroatoms like nitrogen, oxygen, sulfur, and halogen. The blends have low light transmission in the UV and visible range below 1.5%. The compositions can be used in container walls or preforms to protect packaged products from light degradation without compromising visual appeal.

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A recyclable high barrier cellulosic structure for forming cellulosic containers that can resist oxygen, moisture, and light penetration. The structure includes a cellulosic board substrate, a metal oxide layer on the substrate, and a tie layer between them. The cellulosic board substrate has low average and maximum transmittance in the UV-visible light spectrum. The metal oxide layer provides additional barrier properties. The tie layer connects the substrate and metal oxide layer. The structure can be used to form containers like paper-based food packaging.

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Bacterial nanocellulose transparent film with barrier properties for packaging applications. The film is made by electron beam irradiating and mechanically treating wet bacterial cellulose to form nanocellulose fibers with carboxyl groups. The fibers are then filtered and dried into a multilayer structure. Alkali treatment and bleaching further improve properties. The film provides oxygen, moisture, and UV barriers.

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UV-protective sleeve for mason jars and other containers to prevent light-sensitive products from being degraded by UV rays when stored in bright areas. The sleeve has a laminated construction with an outer neoprene layer for insulation, a middle Mylar layer to block UV light, and an inner rubber layer for jar grip. The sleeve covers the jar sidewalls and has a pocket for labels. It provides UV protection, insulation, and jar retention without obstructing access.

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Packaging material with improved barrier resistance to gases, liquids, and UV light using graphene-reinforced polymers. The packaging material is made by exfoliating graphite particles in a molten polymer using shear forces. This converts the graphite into graphene nanoparticles dispersed in the polymer matrix. The graphene-polymer composite has significantly enhanced barrier properties compared to unreinforced polymers. The graphene nanoparticles provide tortuous paths for permeants, strong bonding with the polymer, and reduced gaps between particles. This improves barrier resistance to gases like oxygen, carbon dioxide, and liquids like water.

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