Flutter suppression air foils.

摘要

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 (14) disposed proximate to a pair of opposing planar surfaces of the web (10). Each of the air foils includes a first convex surface facing the web and disposed in contact with air flowing on the web for producing a venturi effect which reduces at least the flutter amplitude in the open draw.