"Only a few degrees short of perfection, expanding surface spreader rolls shine with thin gauge webs."
An impartial examination and evaluation of the performance of all wrinkle-removing systems came in a definite study published in a bound edition, edited by J. K. Good, of the Fourth International Conference on Web Handling, held June 1-4, 1997, at the Web Handling Research Center, Oklahoma State University, Stillwater, OK. The specific study, "Testing and Analysis of Web Spreading and Anti-Wrinkle Devices" by R. P. Swanson, 3M Company, (pp414-428), found "the expanding surface rollers did not wrinkle under any test conditions. The regime 1 (one) performance was excellent. This roller is an aggressive web-spreading device. An expanding surface roller would be insensitive to wrinkles at low, medium, and high tension. This roller is an excellent, high drag, web spreading and anti wrinkle device."(p421). Of the ten types of systems tested, only the expanding surface spreader rolls and the "curved axis" or bowed roll systems were described as "excellent" systems according to the study.
|