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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.
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1. Hot-Dip Galvanizing This method entails cleaning the iron or steel surface and then immersing it in a bath of molten zinc at approximately 450 degrees Celsius. Once coated, the metal is removed and allowed to cool, resulting in a thick, adherent zinc layer that forms various compounds with the underlying iron. This method is known for producing robust coatings suitable for heavy-duty applications.
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