Online Pulp Dirt Count Analysis: Two Case Studies, Paper360º March/April 2017

The amount of visible dirt in pulp, paper, or paperboard can critically affect its usefulness and value. A high number of vis-ible dirt specks, and/or specks that are easily noticed in visual examination, may detract more from the usefulness of the paper mate-rial than would a lower number of specks, or specks that are less easily noticed. For a mill trying to control or monitor its papermaking process, the most important parameter might be the absolute physical area of dirt, or the number of dirt specks present in an inspection area; for end users, the overall visual impression may be the critical parameter. In either case, a mill can’t improve its dirt count without an accurate way to measure dirt and specks in its product.

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