Moisture Barriers for Food Packaging

Sustainable, high-barrier, food-contact packaging materials and methods that replace traditional materials like HIPS and PVdC. The packaging uses a formable sheet made from a specific alloy of polymers, coated with a barrier layer containing polyethyleneimine (PEI) and polyvinyl alcohol (PVOH). The alloy layers have a composition of PET, HDPE, and a compatibilizer. The barrier coating provides oxygen and moisture barrier properties without compromising the sheet strength during forming. The coating composition and method involve intermixing PEI and PVOH with water to create a stretchable, formable gel. This gel-coated alloy sheet can be thermoformed into containers without rupturing the barrier layer. The coating composition and method avoid using HIPS and PVdC, which are banned in some jurisdictions due to environmental concerns.

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Aqueous dispersion of ethyl cellulose with plasticizer for coating substrates like paper to improve moisture barrier properties. The dispersion contains 40-90 wt% ethyl cellulose and 10-50 wt% plasticizer. Coating substrates with this dispersion provides film layers with 40-90 wt% ethyl cellulose and 10-50 wt% plasticizer. This enables high moisture barrier films on paper without solvents. The plasticizer allows ethyl cellulose dispersion coating without blocking. Coating multiple layers further improves barrier.

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Multilayer moisture barrier films for packaging applications that maintain desired moisture levels inside sealed packages without the need for metal barriers. The moisture barrier films have inner layers containing desiccant particles dispersed in a polymer matrix. The desiccant particles absorb moisture from the packaged product. The inner layers can have cavities with desiccant particles inside to further improve moisture barrier properties. The cavities provide multiple points of contact for moisture to interact with the desiccant. The desiccant-containing inner layers replace metal barriers while still maintaining moisture levels inside sealed packages.

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Flexible packaging for hot-fill and retort applications that can survive pasteurization, boiling, and retorting without compromising the integrity of the barrier layer. The packaging structure has a patterned barrier coating that avoids the cut edges and seal areas. This protects the barrier from moisture exposure during processing. The barrier coating is applied only to the interior surface of the panels, leaving those areas around the seams barrier-free. This allows the packaging to withstand high heat and moisture without delaminating or ruining the product inside. It uses a single polymer for recyclability.

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Barrier composite film with improved properties like reduced hygroscopicity, enhanced mechanical strength, and reduced aging compared to conventional barrier films. The composite film consists of layers in order: LDPE, IPN1, EVOH, IPN2, modified PVA. The IPN layers are interpenetrating polymer networks made of specific compositions. The EVOH layer is ethylene vinyl alcohol copolymer. The modified PVA layer is polyvinyl alcohol with added compatibilizer and slip agent. This composite film structure provides improved barrier properties and processing ease compared to single-layer EVOH films.

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A fresh produce packaging solution that prevents high water vapor generating produce from being prematurely desiccated, while at the same time preventing pooling of excess moisture within the package. The solution is a laminate film for packaging fresh produce that allows a limited exchange of moisture with the environment while preventing gas exchange. The film has a first layer with low moisture vapor transport and a second layer with high moisture vapor transport. Windows in the second layer allow excess moisture to escape without gas exchange. This creates a moisture-controlled environment inside the package that avoids desiccation of the produce while preventing excessive moisture buildup.

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Sustainable, high-barrier, food-contact packaging made from a formable sheet with improved oxygen and moisture barrier properties. The sheet contains a barrier coating sandwiched between alloy layers. The barrier coating is a premixed solution of polyethyleneimine and polyvinyl alcohol. The alloy layers are blends of polyethylene terephthalate, a polyolefin, and a compatibilizer. The alloy layers provide mechanical strength and formability. The barrier coating provides oxygen and moisture barrier properties. The coating composition and application method are optimized to avoid rupture during thermoforming and container filling.

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Fully biodegradable cling film with improved moisture barrier for food packaging. The film has two biodegradable cellulose outer layers sandwiched around a starch-based water absorbent layer. The outer layers have water holes on one end to allow air inlet during packaging. This allows the starch layer to absorb moisture from the food instead of condensing inside the film, preventing spoilage and extending shelf life. The entire film is fully biodegradable for environmental benefit.

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Paper-based packaging with improved oxygen and moisture barrier properties for food packaging. The packaging uses a cellulosic fiber substrate with an inner PVOH oxygen barrier layer and an outer moisture barrier layer. The inner moisture barrier can be a polyolefin or functionalized polyolefin. The PVOH layer seals against the moisture barrier to create a hermetic package. The cellulosic substrate allows recyclability. The PVOH inner layer prevents oxygen degradation, while the moisture barrier prevents spoilage. The inner moisture barrier prevents delamination between the layers.

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High-barrier packaging film for controlled atmosphere preservation that extends the shelf life and safety of packaged products like food and medicine. The film has multiple layers stacked inside-out: base layer, inner ethylene-ethanol copolymer layer, inner o-phenylphenol layer, outer polyethylene layer. This provides improved barrier properties against oxygen, moisture, and bacteria compared to single layer films. The inner layers prevent gas and moisture permeation, while the outer polyethylene layer provides strength and sealing. The stacked layers are bonded together. The film can be wrapped around a drum for production and transport, then opened by cutting the outer polyethylene layer.

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Food product containers with improved barrier properties to prevent oxygen and moisture ingress, especially for thin-walled containers like yogurt cups. The containers have a multi-layer structure with an inner barrier layer sandwiched between two outer skin layers. The barrier layer contains a specific composition of polypropylene copolymer, Ethylene Vinyl Alcohol (EVOH), and a tie additive. The EVOH provides the barrier against oxygen and moisture, while the polypropylene copolymer and tie additive improve the container's mechanical properties and processing. The tie additive is an anhydride-modified polypropylene resin.

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Multilayer packaging film for food applications that maintains transparency after sterilization and shaking. The film has three layers: a polyolefin outer layer, an inner ethylene-vinyl alcohol copolymer (EVOH) barrier layer, and another polyolefin inner layer. The EVOH barrier layer sandwiched between the polyolefin layers prevents gas and moisture permeation. The outer polyolefin layer has a higher water vapor transmission rate than the inner layer to prevent delamination. The film retains transparency after sterilization and shaking due to the EVOH barrier and balanced water vapor transmission rates.

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Modified atmosphere cling film for extended shelf life of fruits and vegetables. The film has controlled gas and water permeability to maintain ideal storage conditions for produce. The film is made by adjusting the composition of hyperbranched polyethylene, branched polyethylene, and polyethylene vinyl acetate resin. The hyperbranched polyethylene provides gas permeability and reduces crystallization. The branched polyethylene reduces crystallization further. The vinyl acetate resin forms an island structure with adjustable density to control water vapor transmission. This simultaneous gas and water permeability prevents rot and decay by allowing CO2 and O2 exchange while preventing excessive moisture buildup.

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Modified atmosphere fresh-keeping high barrier packaging film that extends shelf life and inhibits bacterial growth. The film has a base layer sandwiched between two polyethylene layers. Inside the polyethylene layers, an ethylene-ethanol copolymer layer and an o-phenylphenol layer provide freshness preservation. An outer high barrier layer made of polyethylene terephthalate film further enhances barrier properties. The layers are bonded with adhesive. The inner side of the film wraps around a drum for winding. The drum ends rotate to seal the film.

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Erectable-type food container with improved moisture resistance to prevent seepage and leaking of moisture and oil from the contents. The container has a sealed bottom and side walls adhered to the bottom using an insoluble sealing material that prevents moisture infiltration. This sealing material seals the joint between the bottom and side walls to prevent moisture seepage.

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A polyester film for maintaining freshness of packaged fruits and vegetables. The film has specific oxygen and carbon dioxide permeabilities, folding angle, and thermal shrinkage properties that allow easy resealing and extended storage life. The oxygen permeability is 50-1000 cc/m2/day, carbon dioxide permeability is 200-4950 cc/m2/day, folding holding angle is 20-80 degrees, and warm water thermal shrinkage is 0-10%. The film is made from a polyester resin containing ethylene terephthalate. The unique properties enable the film to be easily twisted and folded to reseal after opening, preventing contents from spilling out. The optimized oxygen and carbon dioxide permeabilities extend storage life by maintaining low oxygen and high carbon dioxide

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Spray coating fiber-based food packaging to improve barrier properties like oil, moisture, and vapor transmission. The coating is applied using specialized spray systems with nozzles configured to cover specific areas like bottoms and sidewalls. The coating chemistry includes additives like alkyl ketene dimer (AKD) for moisture barrier, fluorocarbon emulsions for oil barrier, and retention aids. This allows fiber containers to replace plastics in food applications without compromising performance.

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Fresh-keeping anti-fog packaging film for fruits and vegetables that extends shelf life by inhibiting decay. The film has an ink layer for printing, a barrier coating to block oxygen, a biaxially stretched polypropylene layer for strength, and an outer hydrophobic anti-fog coating. The anti-fog coating is on the inside facing the fruits/vegetables to prevent water droplets and high humidity. The barrier coating reduces oxygen levels to inhibit respiration. The film wraps the produce to protect it.

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Packaging systems for storing moisture-inducing foods like fruits, bread, cheese, and meats that release an antimicrobial agent to extend shelf life. The packaging has multilayer films with barrier layers that activate and lose barrier properties in humid environments. The active agent layer between these barrier layers is moisture-sensitive, absorbing moisture and diffusing into the food to provide antimicrobial protection. This controlled release prevents premature loss of the agent from the packaging.

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A composite food packaging film that combines freshness preservation and water vapor barrier properties. The film has three layers arranged sequentially: a barrier layer, an opaque water-absorbing layer, and an air-permeable layer. The opaque water-absorbing layer is located inside a recessed groove on the air-permeable layer. This configuration allows the opaque layer to absorb moisture from packaged food without affecting the barrier layer, while the air-permeable layer allows gas exchange. The groove prevents the opaque layer from contacting the food surface.

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A fresh-keeping packaging bag that allows fruits and vegetables to be preserved at room temperature without needing refrigeration. The bag has an outer layer of polylactic acid and an inner layer of polycaprolactone. The inner layer contains a 1-MCP (1-methylcyclopropene) release agent dispersed in the polycaprolactone base film. The 1-MCP slows respiration and prevents ethylene production by fruits and vegetables. The composite film has high water vapor, oxygen, and carbon dioxide transmission rates to maintain a low humidity, low oxygen, and high carbon dioxide atmosphere inside the bag. This inhibits mold growth, delays ripening, and extends shelf life without needing complex preservation methods like refrigeration.

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A blank for erecting into a moisture-resistant package for wet products like food. The blank has a bottom panel, side walls, end walls, and a top wall with double-walled ends. It also has locking tabs and a lid. The locking tabs fit between the double-walled ends to secure the side wall. The lid folds over the side wall between the ends. This design provides a strong, stackable, moisture-resistant package with a removable lid.

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An edible seaweed sheet with improved texture and shelf life, and a method to prepare it. The sheet contains a seaweed layer sandwiched between grain layers, with a moisture barrier coating on selected surfaces. The barrier prevents moisture ingress to maintain crispness. The sheet is made by bonding grain and seaweed sheets, then coating a barrier on the bonded areas and one side.

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Coated paperboard containers with improved barrier properties and reduced environmental impact compared to traditional polyethylene-coated containers. The containers have a paperboard substrate coated with an aqueous barrier coating, followed by an additional aqueous barrier coating applied over the first coating after the container is formed. This multi-coating process provides enhanced barrier properties against oil, grease, water, and moisture vapor compared to a single aqueous coating. The repulpable, recyclable paperboard containers have better integrity and reduced staining compared to single-coat containers.

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Intelligent controlled-release fresh-keeping composite film that prevents discoloration of contact surfaces between fruits and vegetables and packaging. The film has three layers: a breathable, water-absorbing layer, a smart release antibacterial layer, and a moisture-proof, water-permeable layer. The layers are stacked and bonded together. The breathable layer absorbs moisture, the smart layer releases antibacterials in response to humidity, and the protective layer prevents excess moisture. This allows directed moisture transport, controlled release of antibacterials, and prevents moisture buildup between produce and packaging.

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A five-layer edible composite barrier fresh-keeping film for food packaging that is fully biodegradable and can replace plastic packaging. The film has layers of edible films stacked together, starting from the outside: an anti-sticking layer, a freshness preserving layer, a main base material layer, an antibacterial layer, and an oil layer. The layers are all made of edible films like gelatin or vegetable oil. The composite structure provides barrier properties against moisture, gases, oil, and bacteria without using non-biodegradable plastics. It prevents food spoilage and degradation when exposed to water or humidity like conventional plastic films.

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Intelligent moisture control barrier film for fresh produce packaging that adapts to humidity to prevent spoilage. The film has a porous base layer and a dense additional layer. The base layer allows water vapor transmission while the additional layer blocks moisture when humidity is high. The dense layer contains polyethylene glycol, polyaldehyde ketones, carboxylate and sulfonate groups, and antimicrobials. The dense layer forms when these compounds are applied to the base layer and dried. The intelligent film balances moisture exchange to prevent overdrying or condensation.

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Food packaging film with integrated moisture control to prevent spoilage without adding bulky desiccant packets. The film has a three-layer structure with a middle drying layer containing regular arrays of silica gel adsorption units. The protective outer layer has breakable strips that can selectively expose the adsorption units to match the moisture needs of the contained food. This allows targeted desiccation without adding external desiccant packets.

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A composite film for extending the freshness of fruits and vegetables in refrigerators by combining gas barrier and moisture permeability. The film has a porous support layer and a functional layer with polydopamine and a polyamine polymer. Polydopamine enhances moisture permeability, while the polyamine polymer provides gas barrier properties. The polydopamine and polyamine cross-link to create a dense barrier on the film surface.

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Packaging material for fruits and vegetables that prevents dew condensation inside while maintaining humidity to prevent drying. The packaging material has a laminated film structure with a base made of cellulose acetate and a resin layer on one side. The resin layer can be made of acrylic resin/cellulose derivative, silicone elastomer, or urethane elastomer. This allows controlled moisture permeability to prevent dew condensation while preventing excessive moisture loss from the packaged produce.

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Three-dimensional cellulose-based food packaging with improved barrier properties for food packaging applications. The packaging has a multilayer structure with a moulded cellulose layer sandwiched between a bioplastic layer and a barrier paper layer. The barrier paper layer between the cellulose and bioplastic reduces the need for coating on the cellulose layer to achieve adequate barrier properties. This avoids the use of excessive plastic in the packaging while still providing sufficient oxygen, water, nitrogen, and carbon dioxide barrier properties for food applications. The packaging can have oxygen transmission rates of less than 30 cc/m2/d and water vapor transmission rates of less than 20 g/m2/d. The cellulose-based packaging can be made biodegradable and compostable.

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Machine for wrapping hygroscopic food products to extend their shelf life by preventing moisture absorption. The machine has a feeding device to move products through the wrapping process. At the wrapping stations, vacuum suction is applied inside the wrapping tube to create a negative pressure. This draws the product tightly against the wrapping material as it is sealed, preventing air gaps and minimizing moisture ingress.

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High-strength packaging film for fresh food that prevents spoilage by allowing controlled exchange of oxygen and water vapor. The film has a base layer made of polyvinyl alcohol and a protective layer made of expanded polytetrafluoroethylene. Laser-drilled air guide holes connect the layers and are bonded with air guide units. This allows water vapor to escape and oxygen to enter, preventing condensation and mildew while maintaining oxygen levels for freshness.

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Packaging film with improved moisture resistance and packaging properties for applications like food, sanitary products, etc. The film has a moisture-proof layer with 7-35 µm thickness, a heat-sealing layer with 0.5-10 µm thickness, and sealing strength of 1 N/15 mm or more at 95°C. The sealing temperature is 95°C or less, and the moisture permeability at 40°C 90% RH is 4 g/m2-day or less. This configuration provides high moisture resistance without needing an intermediate anchor layer. The heat seal layer contains an ionomer resin and urethane adhesive, and the moisture-proof layer contains a propylene resin and moisture improver like terpenes or petroleum resins. The low sealing temperature and high sealing strength

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Moisture-proof composite film and packaging bags for protecting sensitive materials from moisture. The composite film has layers like PET, aluminum foil, nylon, glue, and hygroscopic resin. The aluminum foil improves puncture resistance and isolation. The PET protects the foil from wear. The nylon improves inner wear resistance. The hygroscopic resin absorbs moisture. The bags are made by heat-sealing the composite film layers around a cavity with an inner PE layer. The composite film provides moisture protection and the PE prevents contamination.

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Recyclable lined molded fiber food containers that provide improved oil resistance, water resistance, and water vapor barrier for refrigerated and frozen foods compared to traditional molded fiber containers. The containers are lined with a thermoformable cellulose-based acetate film instead of petroleum-based films. The film is bonded to the molded fiber using suction to form a continuous liner. The cellulose-based acetate film avoids PFAs and provides similar performance to PET liners. The molded fiber base is made from virgin bagasse fiber pulp for sustainability. The lined molded fiber containers can hold oil and water better than plain molded fiber, making them suitable for food applications.

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Highly breathable composite film and packaging box for fruits and vegetables that prevents condensation and decay. The composite film has layers in order from outside to inside: a dry layer coated with anti-fogging agent, an antibacterial layer, a high-air-permeability layer with multiple air-permeable layers sandwiched between polypropylene fiber layers, a water-locking absorption layer, and an external sealing layer. The multi-shape air-permeable layers allow oxygen exchange while preventing water vapor, preventing condensation inside the film. The water-locking layer absorbs excess moisture. The sealing layer prevents air leakage. The composite film wraps the packaging box.

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An anti-fog moisturizing high-barrier storage and transportation film for fruits and vegetables that prevents fogging, condensation, and decay during storage. The film has two connected layers, an inner breathable layer, and outer adhesive layers. It also has ventilation holes and absorbing layers to release moisture. The connecting structure bonds the layers together. The inner breathable layer allows gas exchange while preventing fogging. The adhesive layers stick the layers together. The ventilation holes prevent condensation. The absorbing layers absorb excess moisture.

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Durable, non-aluminum barrier film for laminated packaging materials like cartons for long-term storage of liquid foods. The film has excellent gas barrier properties, water vapor barrier, and internal adhesion between layers. It is made by coextrusion with adhesive layers between the barrier layer and outer layer. The barrier layer is a thin diamond-like carbon (DLC) film deposited by vapor deposition. This provides superior gas barrier compared to conventional aluminum foil while avoiding the drawbacks of thick multilayer films. The DLC film has low oxygen transmission rate, good moisture resistance, and internal adhesion for package integrity.

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Packaging material for foods and other products that maintains freshness while also having good sealing properties. The packaging has multiple layers arranged in a specific order: 1) a breathable sheet, 2) a freshness-maintaining layer containing cyclodextrins, 3) a low-breathability sheet, and optionally 4) a reinforcing sheet. The breathable sheet faces the product, the freshness-maintaining layer contacts the product, and the low-breathability sheet provides oxygen barrier. This allows the cyclodextrins to maintain freshness while preventing oxygen ingress. The layers can be coated, laminated, or fused.

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Enhanced barrier layer for packaging materials like food, beverage and pharmaceutical packages that provides effective gas barrier properties at high humidity levels. The barrier layer is made by coating a substrate like paper with a polyvinyl alcohol (PVOH) solution containing a small amount of an interpolymer complex forming agent (IPCFA). The IPCFA forms hydrogen bonds with the PVOH to enhance barrier properties. The IPCFA is a water-soluble polymer with functional groups that bond to PVOH's hydroxyl groups. The IPCFA proportion in the coating is 0.5-7.0% (w/w) PVOH. This provides a barrier layer with low oxygen permeability below 14 ml/m2/day/atm when measured at 80% RH. The barrier layer can also optionally contain nanofillers

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A packaging system for preserving freshness of fruits, vegetables, and flowers during distribution. The system uses a pallet with stacked storage boxes containing the produce, covered by a freshness-preserving film with specific gas permeabilities. The film allows controlled exchange of CO2 and O2 to prevent anaerobic respiration and spoilage. The occupied volume of the boxes is 60-100% to limit air space. The pallet sealing method involves wrapping the boxes on the pallet with the film. This allows gas exchange between boxes and prevents local temperature rises. The film has low moisture permeability to prevent water loss.

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Multilayer film for freshness preserving packaging materials that has excellent strength and can suppress deterioration of inclusions when made into a freshness preserving packaging. The film has a thermoplastic resin layer with a network structure and a polyolefin layer. The polyolefin layer thickness is 5-30 microns. This provides controlled moisture vapor transmission without compromising strength. The thermoplastic resin layer helps prevent damage during packing and transportation. The film balances moisture control with strength for freshness preserving applications.

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Barrier laminate film for retort food packaging that provides improved barrier properties, water vapor and oxygen barrier, after retort processing, and adhesion between layers. The film has a base layer, stress relaxation layer, inorganic barrier layer, and barrier resin layer. The stress relaxation layer contains a urethane with an aromatic ring in the main chain to improve film conformability. The barrier resin layer has an amide crosslinked compound made from polycarboxylic acid and polyamine to enhance barrier properties. This barrier laminate film provides balanced barrier performance before and after retort processing, as well as adhesion between layers.

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Moisture-proof sheet for food packaging that dehumidifies, antibacterial, and degrades after use to avoid pollution. The sheet has a mesh sleeve, moisture-proof body, and desiccant-filled box. The body has layers for degradation, bacterial inhibition, and odor control. The mesh sleeve prevents sheet absorption and contamination. The box absorbs moisture, covers prevent reabsorption, and the sheet degrades.

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Eco-friendly packaging that is recyclable while still providing good barrier properties to prevent food spoilage. The packaging is made by bonding multilayer films of oriented polypropylene (OPP) and cast polypropylene (CPP) without using materials like aluminum. The OPP layers have a base layer of OPP with a coating on the outside, and an inner layer of CPP. This allows easy recycling of the packaging as it is made from a single material, while still providing good moisture and oxygen barrier properties to prevent food spoilage.

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A plastic packaging film with waterproof function to keep food inside dry in cold environments. The film has a body with a cavity, a crease, and a sealing strip at the bottom. The body has an opening with a vent hole connected to a handle. The handle has a groove with a bump. The body interior has a material covered with pearl cotton. The bottom of the pearl cotton has a waterproof layer and a breathable layer. This design provides a vented enclosure with a waterproof bottom and breathable barrier to prevent condensation inside the film when storing food in cold environments.

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Moisture-absorbing and moisture-proof plastic film for packaging that can prevent spoilage of packaged items by absorbing internal moisture and preventing external moisture ingress. The film has layers with specific functions: a wear-resistant layer, a moisture-proof layer, a buffer layer filled with a drying layer, and an outer placement layer with small holes. The holes allow moisture to escape the packaged item while the other layers prevent external moisture ingress.

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A packaging bag for long-term storage of processed foods like Danish pastries that have a porous base and a moist topping. The bag uses a synthetic film with no openings and a specific water vapor transmission rate to prevent moisture loss from the base and prevent drying of the moist topping. This allows maintaining crispiness in the base and moisture in the topping for an extended time.

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A packaging design with a transparent moisture absorber layer sandwiched between barrier layers. The transparent moisture absorber layer contains a thermoplastic resin and a moisture absorbing agent. The barrier layers prevent gas and moisture permeation. The transparent moisture absorber layer allows visual product inspection while absorbing moisture from the contents to prevent spoilage. The barrier layers prevent gas and moisture permeation. The transparent moisture absorber layer allows visual product inspection while absorbing moisture from the contents to prevent spoilage. The barrier layers prevent gas and moisture permeation.

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