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Rapidly solidified Fe–Si–B ribbons have outstanding soft magnetic properties and have been widely used in transformers and electric motors as iron cores to promote their conversion efficiency and performance.1) There are two major processes for continuous casting of rapidly quenched amorphous ribbons which are chill-block melt spinning (CBMS)2) and planar-flow melt spinning (PFMS),3) respectively. The latter planar flow casting process is the most popular one among various rapid solidification processing methods in both academic and industrial communities due to its capability of mass production for wide, thin, and uniform ribbons. The typical system apparatus as shown in Fig. 1 consists of a chill wheel, wheel driving system, wheel cooling system, crucible system, argon gas pressure system, and temperature control system. The applied argon pressure forces the molten metal in the crucible to flow through a rectangular nozzle onto the chill wheel, forming a puddle that is sustained by the surface tension between the nozzle and wheel. The wheel cools and solidifies the molten metal which could be pulled continuously out from the beneath portion of the puddle to collect solidified ribbon at the same flow rate with the melt ejecting onto the wheel. Amorphous ribbons with high surface quality are the Effects of Manufacturing Parameters in Planar Flow Casting Process on Ribbon Formation and Puddle Evolution of Fe–Si–B Alloy