Continuous Coloration of Coatings for Coated Paper & Board, 2011 PaperCon Conference

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One of the very important aspects of making coated paper and paperboard is still being done in a primitive manner, and that is the addition of colorants which give the end product much of its visual (and overall) appeal. The dyes and optical brightening agents are added to the coating in a batch-wise manner, often through the use of manual measurement from a drum or tote into a container, which is then poured into the coating makedown tank by hand. This leads to issues of accuracy, repeatability, manpower utilization, and safety. There is a better way, and the model for the alternative comes from the addition of colorants to uncoated freesheet (and other types of uncoated papers). Pilot work has proven that dyestuffs can be added continuously to coatings just prior to the coating’s application to paper or paperboard with excellent results.