AN ALTERNATIVE METHOD FOR REDUCING WEB FEED RATE VARIATIONS INDUCED BY PARENT ROLL GEOMETRY VARIATIONS

摘要

A method is disclosed for reducing feed rate variations when unwinding a webmaterial totransport the web material away from the parent roll at a web takeoff pointwhere the feed ratevariations are induced by parent roll geometry variations. The method utilizescalculated andmeasured data and selected adjustment percentages to make suitableimprovements in the drivingspeed for an out-of-round parent roll to get closer to a relatively constantfeed rate. By dividingthe parent roll into 1, 2,...n sectors, the data can be refined to arelatively high degree taking intoaccount high speed data processing capabilities as well as operating systemresponse times tomake appropriate driving speed adjustments.