Importance

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Abstract

For a web color change, at least one current dye rate is determined and at least one nominal dye rate for the new web color is retrieved. The difference between the current dye rate and the nominal dye rate is used in a dye rate change response to change the dye rate thereby changing the web color from a first to a second color. The dry rate change response is boosted to achieve a faster rate of color change. Dye rates required for color targets are determined by accumulating historical data of production dye rates that are combined with current dye rate data to arrive at new nominal dye rates for web colors to be produced. A retrieved nominal dye rate and the current dye rate are combined using a filter factor, .alpha., (0.ltoreq..alpha..ltoreq.1), defining the fraction of the historical dye rate which is combined with the remaining fraction of the active dye rate to determine a new nominal dye rate stored as the nominal dye rate for the given product color. The current dye rate is preferably taken near the beginning of a run of a given color; however, it can be taken at any point in the run and can be an accumulation of data which is averaged to determine the active dye rate used to determine the new nominal dye rate to be stored for a given web color.

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