Method of modeling the coloring process in moving web manufacturing

摘要

A method and apparatus are set forth for modeling a coloring process in moving web manufacturing through dye response gain adaptation using measured sheet color spectrum; and dye response shape adaptation using measured color spectrum of the production sheet. The adaptation of colorant (dye) response gain uses the measured sheet color spectrum value at the value of maximum light absorbance of the dye. The adaptation of dye response spectrum uses the measured sheet color reflectance spectrum and sample sheet color spectrum with a corresponding response shape calculated using a formula to adapt the current sheet condition dye response shape using the dye response from the sample sheet on the assumption of a constant ratio of absorption change to dye concentration change.

主权项

1. A color modeling process for use in manufacturing a colored material using at least one of a colorant or optical brightening agent, comprising:
a-priori off-line measuring of the reflectance spectra of sample materials covering a range of production colors and determining therefrom a model; and on-line measuring of the reflectance spectrum of said colored material and adapting said model according to the measured reflectance spectrum of said colored material at a characteristic absorption wavelength for each said at least one colorant or optical brightening agent, and applying said adapted model for at least one of predicting color trajectory or generating control actions to regulate the flow of said at least one colorant or optical brightening agent.