Causes of Common Quality Defects in Color Coated Sheets

2. The spray pipe scratches the substrate, and the defect is located on the back of the steel plate. The main cause of the problem is that the tension is too small and the lower surface of the strip is in contact with the nozzle.

Specific solution: appropriately increase the strip tension in the cleaning section.

3. The squeezing roller scratches the substrate, and the defective part is located on the front and back of the steel plate. The main cause of the problem is foreign matter on the surface of the roller or the squeezing roller bearing jam.

Specific solutions: remove foreign matter on the surface of the roller, adjust the squeezing roller or bearing.

4. The S-roller scratches the substrate, and the defect is located on the front and back of the steel plate. The main cause of the problem is foreign matter on the surface of the roller, and the tension in the furnace body is too different from the outlet looper tension, causing the S-roller to slip.

The specific solution: remove foreign matter on the roller surface, adjust the tension control between the exit loop and the furnace.