Faustel Blog Part 6: Acceleration Offset in Roll to Roll Web Systems

This entry is part 6 of 6 in the series Web Guiding SystemsIn Part 5 of the Web Guiding Systems Series we discussed Guide Accuracy and Response in Roll Winding Systems Acceleration Offset One of the most troublesome of the edge position excursions is known variously as the acceleration or ramp offset. Here, the web moves sideways when machine speed is increased or decreased. Usually the rate of movement is most severe at the top and bottom of the speed change rather than on the speed ramp itself. Unfortunately, the term "acceleration offset" belies the true nature of the cause of the edge movement. Indeed, the web does not even know how fast it is moving. The cause of most acceleration offsets is illustrated by the various web tracks through a machine given in Figure 6. Here we show how the web moves through a machine where one of the rollers is misaligned. In the case of absolute traction, the web will conform to the Normal Entry law on all rollers, including the one that is misaligned. Note how the web moves over as the result of this misalignment. In the case of pure flotation, however, the web is not Continue ReadingThe post Part 6: Acceleration Offset in Roll to Roll Web Systems appeared first on Converting Equipment Manufacturer.