Wet-Strength Solutions for Paper Packaging

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.

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Pulp mold packaging with improved strength, insulation and stackability for fresh product transportation. The packaging has a main body with a cover that attaches inside the main body. This allows for insulation between the main body and cover. The cover has a top and bottom mold with an internal space. The main body has a top mold with an internal space. The cover and main body molds are made of pulp material with a binder, antifoaming agent, and water repellent. Grooves on the molds prevent distortion. A fixed coupling connects the cover bottom to the main body. This prevents jamming when stacked. The internal spaces between the molds can be filled with cellulose foam insulation.

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Functional reinforcing paper with insect repellent, antibacterial, deodorizing, moisture proofing, and freshness maintaining properties for improved packaging quality. The paper has a coating with a functional material like insect repellent, antibacterial agent, deodorant, freshness retainer, or desiccant. It can also be used as a packaging material itself with contact surfaces containing the functional material. The coating enhances strength, water resistance, and oil resistance.

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Thermally insulated, waterproof, and high-strength packaging bag that provides improved protection for goods while reducing wrinkling and damage. The bag uses a composite structure with outer and inner paper layers sandwiched between insulating foam layers. Elastic adhesive is used to bond the layers. The outer layer has a convex buffer structure that disperses pressure. The insulating foam has a gradient height convex structure to prevent wrinkling. The adhesive is a polyurethane emulsion with thickener, wetting agent, and silane coupling agent for strength and elasticity.

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A recyclable pouch that can be suspended and reinforced near the hole to prevent tearing. The pouch is made of fibrous material like paper or cardboard. A strip of fibrous reinforcement is added between the front and rear walls of the pouch near the hole. This concealed reinforcement increases strength near the hole where it is susceptible to tearing. The reinforcement can be joined to the walls using heat activated adhesive for added durability.

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Gas barrier laminate for food packaging that uses paper as the base material instead of plastic. The paper-based laminate has improved water vapor barrier properties after folding compared to conventional paper-based laminates. The key is using a water-soluble or dispersible resin coating on the paper before vapor deposition. This prevents tearing and wrinkling when folded, while still allowing good barrier properties. The paper has specific underwater elongation limits in MD and CD directions to prevent tearing. The laminate density, vapor deposition thickness, and resin layer thickness are also optimized.

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Eco-friendly cushioning packaging material made from natural pulp like sugarcane and bamboo instead of plastic or wood pulp. The packaging material is manufactured by processing paper made from the natural pulp. To reduce dust generation from the short fibers of sugarcane pulp, a small amount of bamboo pulp is added during fabric production. The paper surface is coated with starch and biodegradable wax to improve strength and water resistance. This allows replacing traditional plastic cushioning materials with a more sustainable option that reduces plastic usage, carbon emissions, and environmental pollution.

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Simplified, cost-effective and scalable method to convert conventional hydrophilic paper into hydrophobic paper with improved water resistance and wet strength. The method involves immersing or spraying paper into a dilute solution of multivalent metal ions like Fe3+, Zr4+, etc, followed by drying. The metal ions coordinate with lignocellulosic fibers to induce hydrophobicity, water resistance and reduced water absorption. The metal-ion-modified hydrophobic paper retains high hydrophobicity, stability and wet strength after washing or storage.

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A packaging paper with improved resistance to tearing and puncturing compared to conventional papers. The paper is made by coating one side with a metal salt of carboxymethylcellulose, like sodium carboxymethylcellulose. The coating amount is 0.1-1.2 g/m2. This improves puncture strength while maintaining tensile strength. The paper contains 70% or more softwood pulp (N pulp) and has a disintegration freeness of 400-690 ml and basis weight of 50-150 g/m2. The coating allows the paper to have high puncture strength even after packaging contents, preventing tears during distribution.

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Gas-permeable sheet and packaging material with improved breathability, liquid retention, and seal strength. The sheet has synthetic paper with a polyolefin synthetic pulp layer and natural pulp layer, plus regenerated cellulose composite. This enhances breathability vs natural pulp while retaining liquid. The composite can be a regenerated cellulose layer on the natural pulp surface or impregnated. The sheet also has higher heat seal strength. The composite sheet can be used to make bags containing functional materials like fragrances, insect repellents, etc., which can leak from regular breathable paper bags. The composite sheet seals better, prevents leaks, and allows gas exchange.

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Water-resistant paper with improved printability, condensation resistance, and water resistance. The paper has a water-resistant layer on one side and an undercoat layer on the opposite side. The undercoat layer has specific smoothness and water absorbency. This allows the paper to have good print quality, prevent condensation, and still be water-resistant on the opposite side from the water contacting surface. The undercoat layer contains latex and pigment, and the water-resistant layer contains polyolefin or acrylic resins. The paper is suitable for packaging containers like cups that have both printed surfaces and contact with liquids.

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High barrier food packaging material that improves quality by increasing bonding between the paper substrate and barrier film. The paper substrate is surface modified with ECH (epichlorohydrin) before applying the barrier film. The ECH treatment allows the barrier film to better adhere to the paper and prevents issues like creasing and bubbling. The barrier film is formed by crosslinking polyvinyl alcohol and boric acid with an acid catalyst.

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A food-grade barrier coating for molded pulp products like bowls, trays, and containers that provides water and grease resistance. The coating is made by crosslinking shellac resin applied to the pulp. The crosslinking involves thermal aging in an oven to melt and fuse the shellac chains. This creates a durable, water-repellent coating that penetrates the pulp fibers. The coated pulp products have low cobb (water absorption) and kit (grease penetration) values, making them suitable for food packaging. The crosslinked shellac barrier meets food migration limits at elevated temperatures.

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Filter material for tea bags and other food packaging that uses a biodegradable binder to enhance strength and compostability. The filter contains fibers and a non-fibrous binder like polylactic acid, polyglycolic acid, or copolymers thereof. This binder enhances wet strength properties like tensile and crimp strength compared to traditional synthetic binders. The biodegradable binder also prevents water ingress into the crimped area, making the fold more permanent and reducing dust transfer through the filter. The biobased binder improves compostability and sustainability compared to fossil-based binders.

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Gas barrier laminate and packaging material with improved water vapor barrier properties for packaging applications like food, beverages, pharmaceuticals, and chemicals. The laminate has a paper substrate, a water-dispersible resin layer with silica particles, and a polyvinyl alcohol resin layer. The silica particles in the middle layer have a silanol group density of 10-70 µmol/m2 and aspect ratio of 10-100. This layer sandwiched between the paper and PVA layers provides enhanced water vapor barrier. The laminate can be used as a standalone packaging material or as an inner layer in multi-layer packaging.

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Low-cost, sustainable food packaging made from paper with enhanced barrier properties against water, oil, and gases by coating it with a thin layer of graphene oxide (GO). The GO coating, applied in very small amounts, improves barrier performance compared to uncoated paper for all three substances. The GO-coated paper reduces absorption of water, oil, and gas compared to untreated paper. The coating process involves exposing the paper to an aqueous GO solution and drying it. The GO coating prevents absorption/transmission of substances like water, oil, and gas from the packaged food into the paper.

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A wrapper for aerosol generating articles like heated tobacco products that reduces swelling and prevents breaking during use. The wrapper has two paper layers with different thicknesses. The inner layer has a thinner gauge and lower water contact angle. The outer layer has a thicker gauge and higher water contact angle. This configuration prevents the inner layer from absorbing moisture and expanding, while the outer layer provides strength and resistance to breaking.

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Gas barrier laminate and packaging bag with improved gas and water vapor barrier properties. The laminate has a paper base layer, a crosslinked polyvinyl alcohol (PVA) layer on the paper, and optionally an intermediate layer containing a layered inorganic compound and a water-suspended polymer. The crosslinked PVA layer significantly improves water vapor barrier compared to regular PVA. The layered inorganic compound in the intermediate layer enhances gas barrier. The water-suspended polymer in the intermediate layer helps form the layer. The crosslinked PVA and layered inorganic compound layers provide balanced gas and water vapor barriers. The paper base layer provides processability.

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Paper wrapper for electrically heated aerosol-generating articles like electronic cigarettes that facilitates easy removal from the device without tearing. The wrapper has a wet tensile strength of at least 5 N/15mm when measured after wetting, preventing tearing during use when the high moisture aerosol-generating substrate wets the wrapper. This is higher than conventional cigarette paper wrappers which tear easily when wet. The wrapper's dry tensile strength is also preferably above 10 N/15mm.

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Water-based, non-slip adhesive for paper packaging materials that provides consistent adhesion on a variety of paper substrates without contamination or solvent odor. The adhesive has a viscosity of 4500-5500 cps and a minimum shear adhesive strength of 150 N/cm2. It contains cellulose thickener, acrylic binder, surfactant, and water. The adhesive can replace oil-based adhesives in paper packaging to avoid fire/explosion hazards and environmental issues. The adhesive strength and solids content are tailored for paper types with varying moisture absorption.

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