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A horizontal-type twin roll casting method has been popular for producing aluminum alloy strips, however, it is characterized by a relatively low productivity (1～6 m/min).In contrast, a vertical-type high-speed twin roll casting method possesses an extremely high productivity (60～120 m/rain (1～2 m/s)) and an excellent heat extraction ability.The rapid cooling effect provided significant microstructure refinement and mechanical properties improvement in various kinds of cast aluminum alloy products.