From MAGPOWR
There are several methods of slitting aluminum foil, including shear, razor and crush (score) slitting. This discussion focuses on the shear slitting method, since it is capable of slitting under a far wider range of calipers, tempers, and speeds than razor or crush methods.
The most common complaints when slitting aluminum foil are: a distorted edge, seen as a small crease or longitudinal bend along the slit edge, or the edge may appear to have a â scallopedâ appearance. Wound rolls may have â bell endsâ , indicating that the slit edge, being stretched, is longer than the web itself. Thicker aluminum products may also have a burr on either the top or bottom edge of the slit.
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