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edge fluting

n. ~ A wave-shaped deformation along the edges of a flat surface.

Notes: 

Edge fluting may appear on the edge of cut sheets or rolls. It may be caused by an expansion of the edge of the material, which is exposed to greater variations in temperature and humidity than the center. It may also be caused by physical deformation, sometimes caused by the material rubbing against the flange of the reel or being pulled unevenly through a transport mechanism.