Wrinkle-free conveyance in nips
Abstract
Wrinkling in nips with ultra-thin webs is empirically studied. In web converting, nips are used for tension isolation drives, gravure coaters, prevention of air entrainment on rollers and winding rolls, calendaring, laminating, etc. A common concern is wrinkles/creases that can form in the nip. The effects of roller design (straight, concave, bow, expanding surface, and compliant spiral groove) immediately upstream of the nip, web tension, web speed, and nip load on wrinkles are tested. Over the range of process parameters tested, the bowed roller was the most robust at preventing wrinkles in the nip. It was also learned that under certain conditions, the nip, itself, helps to prevent wrinkles.
Citation
Rice, B. S. (2005, June). Wrinkle-free conveyance in nips. Paper presented at the Eighth International Conference on Web Handling (IWEB), Stillwater, OK.