Filler Premixing for Packaging Materials

Sheet for press-through packaging, like for medicine blisters, with improved properties for environmental friendliness and manufacturing ease. The sheet contains vinyl chloride resin, biomass resin, and a plasticizer. It has a specific storage modulus range of 1-2.6 GPa at 30°C. The biomass resin is a butylene succinate like polybutylene succinate. The plasticizer is epoxidized vegetable oil like epoxidized soybean oil. The vinyl chloride resin has low chlorine content. This composition allows manufacturing press-through packages with biomass content over 10% and reduced bleeding of plasticizers during production.

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Laminate sheet for food packaging with improved moldability and processability. The laminate sheet contains a high percentage of inorganic powder, like calcium carbonate, in the inner layer. The powder particle size distribution is critical to avoid variations in moldability during mass production. The particle size range is 0.9-2.9 μm (D10), 2.2-4.2 μm (D20), 3.6-5.6 μm (D30), 5.0-7.0 μm (D40), and 6.4-8.4 μm (D50). The inner layer contains more powder than the outer layers. This composition provides stable moldability and processability of the laminate sheet and resulting food packaging containers, even with high filler content.

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A laminated sheet for food packaging with improved moldability, mechanical properties, and appearance. The laminated sheet has an inner layer containing calcium carbonate filler and thermoplastic resin, and two outer layers of thermoplastic resin. The inner layer calcium carbonate filler has calcium carbonate particles with surface treatment containing sulfonic acid or phosphoric acid ester. The calcium carbonate content in the inner layer is 40-80% by mass. The outer layer thickness is 2% or less of the total sheet thickness. This laminate reduces variations in moldability, mechanical properties, and appearance compared to conventional calcium carbonate filler laminates. The surface treatment on the calcium carbonate particles improves dispersibility, reactivity, and reduces void formation during processing.

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Biocomposite packaging material made from high density polyethylene (HDPE), red seaweed powder, and coconut coir powder. The composite is manufactured by mixing the three components in a rheomixer at specific temperatures, speeds, and times. The resulting biocomposite has properties like tensile strength, modulus of elasticity, and melting temperature that exceed those of pure HDPE. The seaweed and coconut coir additives improve the composite's mechanical and thermal performance. The process involves melt mixing HDPE, seaweed powder, and coconut coir powder in a rheomixer at temperatures around 135-145°C for 5-10 minutes. The resulting biocomposite blocks are then injection molded into packaging products.

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Laminated sheet and food packaging container with improved moldability and processability when filled with high levels of inorganic powder like calcium carbonate. The key is adjusting the particle size distribution of the inorganic powder in the inner layer. The D10, D20, D30, D40, and D50 particle size measurements should all be within specific ranges. This prevents variations in moldability when the sheet is manufactured and when molded products are made from it.

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