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28
2025
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06
Precisely Controlling the Opening Performance of High-End Packaging Films and Enabling Quality
For pharmaceutical blister packaging, it can improve the bond strength between film and aluminum foil while preventing drug migration.
High-end packaging demands strict film opening characteristics, including "easy opening, high transparency, and aging resistance," and silica, with its controllable microstructure and excellent interfacial compatibility, has become the "performance benchmark" in the field of open-blocking agents. It plays an irreplaceable role in controlling film slip, improving processing stability, and optimizing the packaging experience, making it suitable for high-end packaging applications such as food, pharmaceuticals, and electronics.
Its core advantage lies in its high-end customized process. This high-end open-blocking agent silica is produced using a vapor phase method and ultra-precision classification technology. The particle size is precisely controlled between 2-5μm, with a particle size distribution span of less than 1.2, and a specific surface area of 300-600m²/g. Its surface is hydrophobically modified with trimethyl silylation, resulting in excellent compatibility with resins such as polyethylene (PE) and polypropylene (PP), and it meets FDA food contact standards (21 CFR 178.3620).
When it comes to controlling open-blocking performance, it is a "micro-spacing master." Adding 0.1%-0.3% silica to high-end BOPP film creates evenly distributed microscopic bumps on the film surface, creating nano-scale breathable gaps between the film layers. This reduces the opening force from 0.8N/15mm to below 0.2N/15mm, completely eliminating film sticking without compromising the film's light transmittance (maintained above 92%), making it suitable for high-transparency food packaging.
Silica acts as a "stabilizing agent" for processing and improving durability. Its rigid particles reduce tensile deformation during film processing, lowering film breakage by over 30%. It also exhibits excellent high and low temperature resistance (stable from -40°C to 120°C), maintaining stable opening performance even in cold chain packaging or high-temperature sterilization applications, avoiding the increased haze caused by the precipitation of traditional anti-blocking agents.
For high-end applications, it allows for "functional customization." For electronic component packaging, modified silica can also provide antistatic properties. For pharmaceutical blister packaging, it can improve the bond strength between film and aluminum foil while preventing drug migration.
As the packaging industry upgrades toward lightweighting and functionalization, the development of nano-composite silica and biodegradable silicon-based anti-blocking agents is accelerating, injecting new momentum into the performance advancement and green development of high-end films.
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Jinan City, Shandong Province,China
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