Keywords: air drag, festoon, accumulator
At the Oklahoma State University IWEB 2015, Paul Beuther presented a paper about air drag between various webs and rollers. The paper is called “Impact of Web Permeability On High Speed Web Transport”.
The paper discussed air drag in festoons or accumulators, which have many, many idler rollers. An equation for te4snion loss based on air drag was given as well as experimental results for a number of products and web speeds.
At high web speeds, the tension due to air drag may vary severely when the accumulator fills or empties. This is one more factor in controlling tension when festoons or accumulators are used.