What are the common quality defects of aluminium coil

What are the Common Quality Defects of Aluminium Coil 
 
Aluminium coil are widely used in electronics, packaging, construction, machinery and so on, Well, what are the common quality defects in aluminium coil?



1．The composite layer shedding: irregular defects of composite cladding layer and the substrate to leave off the formation.
 
2．Aluminium coil Embossing: because of the band wrinkle, broken tape and other reasons lead to uneven roll surface irregularities in the rolling process, periodically printed to the surface of the strip chromatic aberration.
 
3．Aluminium coil Wave: a wide variety of irregularities in plates and strips due to uneven deformation. With the edge of the plate, the resulting wave called edge waves, generated by the middle wave called the intermediate wave, between the middle and edge is not in the middle and at both sides of the wave is called the two rib wave, small size and usually rounded waves called surf.
 
4.Aluminium coil Edge: after rolling or cutting, the edge of the band raised.
 
5.Aluminium coil Side bending: the longitudinal side of the plate and belt shows a non straight line bent to one side.
 
6.Aluminium coil Collapse volume: roll core serious deformation, roll shape is not round.
 
7.Aluminium coil Cuoceng: strip between the layers and irregular surface dislocation caused by surface roughness.
 
8.Aluminium coil Tower: roll belt between layer and layer to the side moving form tower offset.
 
9.Aluminium coil Loose volume: coiling, uncoiling, layer and layer between the loose, serious when affecting the whole volume.
 
10.Aluminium coil Bird's Nest: with a roll on the end of the production of partial "V" - type defects. The defect in the belt coiling process or after unloading, some to be produced only after a period of time.