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Causes of pressure spots on color steel sheet
High quality color corrugated steel sheets are very popular right now, but they seem to be diverging. In the northern region color coated coil market stability in the collation, demand is still not volume, so for color coated coil price is also relatively weak, the important factor affecting the color coated coil price trend is the price of raw materials.
Compared with the construction board, the substrate used in the color coating board for home appliances has higher elongation, a ratio of buckling and strength and corresponding r value and n value. And its film and substrate adhesion is required to be strong, the coating has a certain degree of flexibility, the corresponding hardness is low. Home appliances with painted steel coils in shear uncoiling, the surface often appears a defect – surface pressure spot defect, the defect is painted plate coating baking, cooling after coiling, coiling tension resulting in the coating surface slight deformation, sometimes the surface appears rough, showing the visual pressure spot form. Slight pressure spot defects will gradually disappear with the extension of the storage time of the steel plate and can be eliminated by heating. But the more serious pressure spot defect even if USES the above measure also cannot eliminate, thus affects the user to use.
Pressure spot is a kind of defect produced in the production process. If the causes and influencing factors of the defect are found in the production process, it needs to go through many times of downtime for inspection and schedule, affecting the production plan and increasing the production cost. Therefore, it is necessary to simulate and replicate this defect in the laboratory and evaluate it, so as to find out the cause of the defect and the factors affecting the defect from all aspects.