UV Light Barriers for Food Packaging Protection

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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Light barrier compositions for packaging materials that block UV and visible light to protect packaged foods from degradation. The compositions contain polyethylene terephthalate (PET) along with selected other polymers like polypropylene (PP), polylactic acid (PLA), or polymers with heteroatoms like nitrogen, oxygen, sulfur, or halogen. The specific polymer blends have low transmittance in the 400-700 nm range to block UV and visible light. The compositions can be used in containers, preforms, and walls to provide light barrier properties without sacrificing visual appeal.

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Adhesive packaging material with light-shielding and oxygen-blocking properties for protecting sensitive products like food, medicine, and chemicals from degradation caused by light and oxygen. The packaging material consists of three layers: an outer printing layer, a middle layer with leather fiber and white masterbatch, and an inner black layer. The white outer layer provides moisture resistance and light blocking. The middle layer covers the inner layer and has the leather fiber and white masterbatch to block light and moisture. The inner layer is black to block light and provide oxygen barrier.

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Method for quantifying the photoprotective performance of complete packaged products like foods and beverages by exposing them to controlled light conditions. The method involves placing filled packages inside a specialized light exposure chamber that can maintain consistent temperature and humidity. The packages are monitored as they are exposed to defined light doses to determine how well the contents retain quality and stability under accelerated light aging. This allows quantifying the photoprotective performance of the entire packaged system, including the container and label, versus just the product. The chambers also have instruments to monitor light intensity, temperature, and humidity during the exposures.

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Preforms and containers for packaging consumables like milk that block light to prevent degradation. The containers and preforms contain a cyclic olefin copolymer (COC) along with a polyester like PET. The COC provides high light blockage while the polyester forms the bulk of the container. The COC prevents light transmission by scattering it internally. The COC also improves clarity compared to adding dark pigments to the polyester. The containers have an opaque white appearance without compromising recyclability.

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Bifuran copolyesters with UV blocking properties for transparent food and beverage packaging. The copolyesters contain bifuran units derived from a bifuran dicarboxylic acid, along with other dicarboxylic acid and diol monomers. The bifuran units provide UV absorbance in the 300-400 nm range, making the copolyesters transparent with low UV transmission. The bifuran copolyesters can be prepared by melt polycondensation of the monomers.

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Chicken essence aluminized packaging with reduced UV transmission to prevent oxidation and spoilage of the high-fat chicken flavoring. The packaging has multiple UV absorbing adhesive layers between the BOPP, aluminum, and PE layers. This sandwich of UV blocking layers improves UV resistance compared to just an aluminum coating. The UV absorbing adhesives help prevent light-induced oxidation of the chicken essence, preventing flavor degradation and shelf life issues.

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Packaging material for light-sensitive products that has a light barrier over orifices like straw holes to prevent degradation. The packaging has a layer covering the hole with a paint containing carbon black or titanium dioxide to block light transmission. This light barrier can be applied to the exterior of the second layer covering the hole. This allows mass production of packaging with light barrier orifices using conventional equipment without adding aluminum foil. The paint can be applied before or after the wrapping is made.

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