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Common Quality Issues of The Steel Coil
1. Leak coating
The top coat of the China high quality prepainted color galvanized coil was not coated.
a. The side finish is not coated, the substrate plate type is not good or the pressure between the coating roller and the large back roller is insufficient.
b. The middle surface of the board is not painted. After the primer is cooled, there is water or other foreign matter on the board surface.
2. Color difference
The color of the color galvanized coil differs from the standard board.
a. The coating thickness is too thick or too thin.
b. Not a batch of paint.
c. Stirring is uneven when the viscosity is diluted.
3. Poor gloss
The gloss range of the coil is abnormal.
a. The coating thickness is not appropriate.
b. The curing conditions are not appropriate.
c. Stirring is not sufficient.
After the color galvanized coil is taken up, the inner diameter is deformed when stored in the warehouse.
a. After the coil is taken up, it is affected by external force.
b. The winding tension is not correct.
c. The load is uneven.