Apparatus and methods for reducing the amplitude and frequency of web-edge flutter associated with drawing web materials are provided. The apparatus includes a pair of air foils disposed proximate to a pair of opposing planar surfaces of the web. Each of the air foils includes a first convex surface...http://www.google.fr/patents/US5022166?utm_source=gb-gplus-shareBrevet US5022166 - Flutter suppression air foils
