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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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However, there are scenarios where a rougher surface may be beneficial. In construction applications, for example, a rougher galvanized surface can provide improved bonding with paints and other coatings, ensuring durability and protection against corrosion over time. Moreover, in certain industrial applications, increased roughness can enhance mechanical properties such as resistance to wear and tear.
roughness of galvanized iron factories

Usually a flat bed sheet is overlocked around the edges to form four seams. One of the seams is wider than the other three and helps with orienting the sheet correctly on the mattress. The wider seam goes at the head end of the mattress. Sometimes the sides do not have seams, but are finished with the selvedge only. When one makes a bed, the patterned or monogrammed side of the top sheet may be placed facing up, or facing down, in which case the top edge may be folded towards the foot of the bed to expose the design.