Kaolin Clay for Package Surface Enhancement

Paperboard for packaging liquid and frozen foods that provides a barrier against moisture resulting from condensation while maintaining good optical properties and printability. The barrier is achieved by applying a dispersion coating on the exterior side of the paperboard containing latex (30-50%) and clay (50-70%) pigments. This dispersion barrier replaces traditional polymer coatings on the exterior side for a simplified and more sustainable packaging solution.

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Coating formulations for paper and paperboard with improved hiding power and coverage. The coatings contain modified clay pigments with higher shape factors compared to conventional clays. The modified clays have plate-like shapes that pack less densely, allowing more space between particles and increasing the volume of the coating for a given weight. This results in better hiding power and coverage compared to standard clay coatings. The modified clay shape factors are calculated based on particle size distributions.

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Coating compositions for paperboard that have higher bulk volume and better hiding power compared to conventional coatings. The coating compositions contain kaolin clay with a specific particle size distribution to increase packing density and reduce compaction. The clay has fewer fines (less than 30% <1 μm particles) and a higher sediment void volume (>48%) compared to standard clay. This modified clay provides looser packing and higher bulk volume when used as a pigment in coatings.

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Coating paperboard with a low packing density clay to improve the properties of the coated paperboard. The clay used has a specific particle size distribution with a low proportion of fine particles. This clay has a particle size distribution where less than 30% of the particles are smaller than a certain diameter. By using this clay in coatings applied to paperboard, it allows reducing the coating weight and thickness compared to standard clay coatings without sacrificing properties like whiteness or opacity. The lower packing density clay provides better hiding power and reduces the amount of coating needed.

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Coated paperboard with improved opacity and printability by using a low fine particle kaolin clay with specific particle size distribution and packing density. The clay contains less than 30% of particles below 1 micron diameter, measured by Sedigraph analysis. This clay has a sediment void volume greater than 48% indicating low packing density. This modified clay coating provides better opacity and printability on paperboard compared to standard clays.

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Composite material for retail and shipping packaging that is durable, attractive, environmentally friendly, and resistant to theft. The composite structure has a fiber-containing layer sandwiched between a mineral-containing layer. The mineral layer provides stiffness, strength, and environmental benefits. The fiber layer improves printability and moisture barrier. The composite balances properties for processing and final product shapes. The mineral content is 35-65% by weight, with specific minerals like talc, mica, and clay.

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White paperboard with improved texture, rigidity, and whiteness compared to conventional white paperboard. The key is blending specific amounts of inorganic fillers in the front, middle, and back layers. The filler content in the front and back layers is 1-9% by weight of pulp fiber. In the middle layer, it's 2-15%. This improves fiber entanglement, formation, and concealment of the middle layer while maintaining rigidity and whiteness in the front and back layers. The fillers used include light calcium carbonate, heavy calcium carbonate, clay, and recycled fillers like incinerated sludge.

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White paperboard with improved texture, rigidity, and whiteness. The paperboard has a three-layer structure with specific filler content in the front and back layers. The front and back layers each contain 1.0-9.0% inorganic filler by weight of the pulp fibers. The middle layer contains 2.0-15.0% filler. This blending improves fiber entanglement, formation, and concealment in the front and back layers. It also allows appropriate rigidity and whiteness in the middle layer. The filler composition can be light calcium carbonate, heavy calcium carbonate, clay, talc, etc.

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