Production technique of three-coat color-coated steel plate

Abstract

The invention provides a production technique of a three-coat color-coated steel plate, which is characterized in that the steel plate is produced through a double-coat double-bake color-coated machine set by the following steps: (1) primary production: uncoiling a basal plate, seaming, degreasing, preprocessing, coating primer, baking, cooling and coiling to complete the primary coat on the front side and the back side of the steel plate; (2) and secondary production: uncoiling, seaming, coating the intermediate paint, baking, cooling, top coating, baking, coiling and coiling to complete the intermediate coat and the surface coat on the front side of the steel plate, and the surface coat on the back side. The invention utilizes the double-coat double-bake machine set to produce the three-coat product, and does not need a special three-coat three-baking machine set, thereby greatly saving equipment and space and reducing the cost; in addition, the technique can accurately control the thickness of the bottom coat, middle coat and face coat, ensure the surface quality and good binding force among the layers during coating the coat, and ensure the comprehensive coat performance after three-coating.

Description

Technical field The invention relates to a color-coated steel sheet, specifically, the invention relates to a production process of a three-coated color-coated steel sheet. Background technique Color-coated steel sheets are currently widely used in industrial plants, stadiums, airport facilities and other construction fields. As building roofs and exterior walls, they provide a beautiful appearance, long life, and are convenient for construction and maintenance. Color-coated steel sheets are mainly divided into 2 / 2 and 2 / 1 according to the surface coating structure, that is, two layers of coating on the front (primer and topcoat), two layers of coating on the back (primer and topcoat) or one layer of coating ; The total coating thickness on the front is generally 20-25μm, and the total coating thickness on the back is generally 5-15μm (the basic structure is shown in Figure 1). Among steel products, the production process of color-coated products is the longest, which mainly i...

AI Technical Summary

Problems solved by technology

At present, in the literature and patents published at home and abroad, there are no reports and records about the production process of three-coat products produced on two-coat and two-dry units.

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