Reasons for the collapse of Pre Painted Steel Coil
Collapse mainly occurs on thin strips, high-strength or Pre Painted Steel Coil with special colors or surface textures. Such as strip thickness ≤ 0.45mm and matt/wrinkle PPGI steel coil and film PPGI steel coil. The direct cause of the collapse phenomenon is that the color steel coil is curled and unrolled (color roll off-line) after the unwinding phenomenon occurs. After the coil is uncoiled, due to the reduction of the number of steel strip layers per unit thickness of the steel coil, the specific strength is lower than the normal state, and the horizontal steel coil collapses under the action of its gravity.
Paper tubes can be used instead of iron tubes, film-coated and suede-faced ones should use thick iron tubes if there are gaps in the rolls. For rolls with a thickness of less than 0.2mm, it is also recommended to use iron tubes to prevent roll deformation.