Patent ID: 6584372
Filing Date: 2003-06-24
Classification: D21H

Abstract:
A method for changing color of a web of paper from a first color to a second color during manufacture of said web, said method comprising the steps of:operating a paper making machine to produce a web of paper having said first color; determining a current dye rate for at least one dye during production of said web having said first color; retrieving a nominal dye rate for at least one dye for producing said web having said second color; determining a dye rate boost value greater than said nominal dye rate for a dye rate increase and less than said nominal dye rate for a dye rate decrease; determining a period of time of initially applying said dye rate boost; determining a difference between said current dye rate and said nominal dye rate; and using said difference between said current dye rate and said nominal dye rate to change the dye rate for said at least one dye for said second color from said current dye rate to said nominal dye rate to change said web from said first color to said second color and initially applying said dye rate boost value for said dye rate boost period of time.