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The factory process behind metal lunch boxes often involved a series of intricate steps. First, the raw materials were sourced and cut into the appropriate sizes. Next, the metal sheets underwent printing, where vibrant colors were applied to create eye-catching designs. The pieces were then shaped, bent, and fused together, creating a sturdy construction that could withstand the rigors of daily use. Finally, a protective coating was applied to guard against rust, ensuring these lunch boxes would endure for years.
metal lunch boxes vintage factory

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In addition to their longevity, these steel sheets offer excellent structural integrity
. The corrugated design enhances strength without adding excessive weight, allowing for ease of handling and installation. They can withstand heavy winds, snow loads, and other environmental stresses, making them suitable for use in various climates and conditions.