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2. Climate Considerations In areas with significant temperature fluctuations, the thermal expansion and contraction of metal roofing can affect the choice of panel width. Larger sheets may expand and contract differently than smaller ones, impacting the roof’s performance.
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Leading manufacturers typically offer a range of galvanizing processes, such as hot-dip galvanizing or electro-galvanizing. Hot-dip galvanizing involves immersing the metal in molten zinc, resulting in a thicker coating that provides superior corrosion resistance. On the other hand, electro-galvanizing applies a thin layer of zinc through an electrochemical process, often resulting in a more polished finish, but may not offer the same level of protection as hot-dip galvanization.
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Once the graphics are finalized, manufacturers move to the creation of the tin boxes themselves. The process involves cutting and shaping sheets of steel, which are coated with a layer of tin to prevent rusting and ensure durability. The pieces are then pressed into shape and assembled—usually featuring a hinged lid and a sturdy handle, reminiscent of the lunch boxes popularized in the mid-20th century.
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