| 摘要 |
PROBLEM TO BE SOLVED: To improve a blanking property and weldability by applying a suspension prepd. by dispersing a polyethylene(PE) power resin of a specific particle size into a resin treatment contg. a water-soluble resin consisting of epoxy ester and melamine resin on the surface of a magnetic steel sheet, then baking the coating. SOLUTION: The suspension prepd. by previously dispersing the PE powder resin of 5 to 80μm particle size in the resin treating liquid which contains the water-soluble resin consisting of the epoxy ester and the melamine resin and of which 15 to 35wt.% of the solid content is the melamine resin is applied on the surface of the magnetic steel sheet and are then so treated as to be baked in the case the insulating film are formed on the magnetic steel sheet used adequately for iron cores, etc., of motors for household electrical applications, transformers, etc. The suspension prepd. by previously dispersing the PE powder resin of 5 to 80μm particle size in the org. resin emulsion is otherwise applied on the surface of the magnetic steel sheet and are then so treated as to be baked. A methylolated resin is preferably used as the melamine resin.
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