Characteristics of aluminum foil

Aluminum foil is a malleable metal sheet crafted from industrial-grade pure aluminum through numerous rolling processes. It commonly possesses a thickness of less than 0.2mm for packaging applications. Based on post-rolling heat treatment, aluminum foil is categorized as either soft or hard.

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Excellent Packaging Properties

Aluminum foil boasts an array of remarkable properties as a packaging material. Its household use version shines with a silver-white metallic luster, and the printing decorations enhance its visual appeal. It offers high barrier protections against water, vapor, gases, aromatic substances, and light, preventing moisture absorption and oxidation of contents. Additionally, it resists damage from microorganisms and insects, making it ideal for anti-mold, anti-bacterial, and anti-insect packaging. Aluminum foil can endure high-temperature cooking and other thermal processes, maintaining good low-temperature tolerance suitable for freezing applications. It's also user-friendly for processing, compatible with automatic packaging machinery, and amenable to printing, laminating, and embossing treatments.

Dependence on Thickness

The barrier properties of aluminum foil heavily rely on its thickness. Thin foils are susceptible to pinholes, reducing their effectiveness. On the other hand, increasing the thickness hikes the cost. Practical usage suggests that a foil thickness of 3 microns is optimal for composite packaging.

Mitigating Aluminum Foil Disadvantages

Aluminum foil has its downsides, including poor resistance to folding, easy wrinkling, and low breaking strength, making it unfit for use under stress. To counter these drawbacks, it is often combined with paper or plastic, among other materials. Subsequent processes like compounded layering, printing, coloring, and embossing significantly enhance its packaging performance, extensively diversifying its applications, predominantly in food packaging.

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