Slit is an unavoidable attention in the rolling of foil sheets. They begin to tear lengthwise, often with metallic threads. The root cause of seam opening is the entrance side discounting, often occurs in the middle, mainly due to the incoming materials in the middle of loose or poor roll.

As a result of the poor shape of the foil, it will wrinkle when the foil is rolled or unfolded, essentially because the tension is not enough to flatten the foil.

Winding defects mainly refer to loose winding or loose and tight. Due to the limited tension that aluminum foil can withstand, it is very difficult to roll hard coil. It is ideal to obtain the inner tight and outer loose coil, and sufficient tension is the condition to form a certain tension gradient. Therefore, the coiling quality results depend on the shape of the plate, loose in the core and tight in the core will form transverse edges, while loose in the core will form ellipse, which will affect the later processing.

Aluminum foil rolling is difficult to control the thickness difference, for aluminum foil production is difficult, the reason is thin, other trace conditions can be affected, aluminum foil rolling roll can reach hundreds of thousands of meters, rolling time is about 10h, with the extension of time, the thickness difference is very easy to form.

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