The smooth drum is a cylindrical part, divided into driving and driven rollers. The smooth roller is widely used in various transmission conveying systems such as rotary screen printing machine, digital printer, conveying equipment, paper making and packaging machinery. Usually made of seamless steel pipe, there are also aluminum alloy 6061T5,304L/316L stainless steel, 2205 duplex stainless steel, cast steel, solid forged alloy steel core as materials depending on different processes.