Method for producing coated metal strip
AssigneeNisshin Steel Co., Ltd.
InventorsShigeyasu MORIKAWA, Takahiro FUJII
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Abstract
A coating that contains acid-modified polypropylene and that contains 5 mass % or more of nonvolatile matter is applied to a traveling metal strip in a state in which the surface temperature of the metal strip is 60° C. or lower. Next, the coating applied to the metal strip is baked at 80-250° C., and a coating film having a film thickness of 0.3 μm or greater is formed on the traveling metal strip. The proportion of acid-modified polypropylene to resin total mass in the coating film is 40 mass % or higher. The traveling metal strip is then wound after being cooled to a surface temperature of 80° C. or lower.
Claims4
A method for producing a coated metal strip which is a metal strip having a coating formed on at least one surface thereof, the coating being a part to be joined to a molded article of a thermoplastic resin composition, the method comprising:
- running a metal strip;
- applying onto the running metal strip a coating material containing an acid-modified polypropylene, the coating material containing 5 mass % or more of a nonvolatile component, wherein the coating material is applied in a state where a surface temperature of the running metal strip is 60° C. or lower;
- baking, at a temperature of from 80 to 250° C., the coating material applied onto the running metal strip to thereby form on the running metal strip a coating with a thickness of 0.3 μm or more;
- cooling the running metal strip having the coating formed thereon until the surface temperature becomes 80° C. or lower;
- and
- winding the running metal strip which has been cooled after forming the coating,
- wherein a ratio of an acid-modified polypropylene to a total resin mass of the coating is 40 mass % or more.
Dependencies are inferred from the claim text.