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Galvanization involves coating iron or steel with zinc to prevent rusting. While this treatment extends the life of pipes, it also alters their surface texture. The roughness created by the galvanization process can increase the friction factor compared to smooth-walled pipes. This increase implies greater energy requirements for pumping fluids through galvanized pipes, particularly in systems that rely on water or other low-viscosity fluids.
friction factor of galvanized iron pipe factories

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.
star wars tin lunch box manufacturer
