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AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsHiroyasu Furukawa, Hiroshi Kanai, Kenji Inada, Katsunori Tobisawa, Shigenori Tanaka, Kohei Ueda, Kengo Yoshida, Yoshihiro Suemune
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A precoated metal sheet produced by simultaneous multilayer coating, and a process for producing the same, is provided with improved color shading prevention and adhesion. In the precoated metal plate, the centerline average roughness Ra in the coating film interface is not less than 0.3 μm, and the maximum height from the waviness center line in the interface is not more than 50% of the layer thickness. Also provided is (i) a top clear coated metal plate, which comprises a clear layer as an upper layer, has an interfacial centerline average roughness Ra of 0.3 to 0.7 μm and has excellent weathering resistance; and (ii) a precoated metal plate having excellent processability and corrosion resistance, which contains not less than 30% by mass of a rust preventive pigment.
A precoated metal sheet produced by multilayer simultaneous coating and superior in workability and corrosion resistance, comprising
A precoated metal sheet produced by multilayer simultaneous coating, comprising a metal sheet with two or more layers of coats formed on a surface of the metal sheet using a multilayer simultaneous coating system, said precoated metal sheet characterized in that a centerline average roughness Ra of an interface of adjacent layers of coats is 0.3 to 0.7 μm and in that a maximum height of waviness of the interface from its centerline observed by a magnification of ×500 is 50% or less of the thickness of the layer positioned above the interface measured from said centerline, the waviness having a pitch of 0.5 to 1 mm.
A top clear type precoated metal sheet, comprising at least a metal sheet and two or more layers of coats formed on said metal sheet using a multilayer simultaneous coating system, said precoated metal sheet characterized in that said coats include at least a transparent or semitransparent upper clear layer and a lower coat layer adjoining said upper clear layer and in that a centerline average roughness Ra at an interface of said upper clear layer and said lower coat layer observed by a magnification of ×500 is 0.3 to 0.7 μm, the waviness having a pitch of 0.5 to 1 mm.
Dependencies are inferred from the claim text.