1, Color Difference
Color differences appear in the same batch of color.
2, Vulnerability
After the color roll is opened, there are some galvanized surface with the size of sesame seeds on the front or back. Such problems often occur in domestic color paints.
3, Take Off The Lacquer
Color steel coil opened after a little rub, there will be paint off phenomenon. It shows that the paint is baking tender. Or paint quality is not good, adhesion is poor.
4, Wrong Side
Wrong edge, that is, uneven roll edge, mainly in the Indian substrate color coating such problems. Mainly by India galvanized sheet production process decided. This kind of color-coated board for the production of corrugated board will not have problems, in the production of sandwich board, if the rolling speed is high, or the technology is not good, there will be deviation phenomenon.
5, Burned
Paint baking time is too long, the color turns yellow, Or the ambient temperature changes and the machine speed does not adjust.