TAPPI T 563 PDF

Equivalent Black Area (EBA) and Count of Visible Dirt in Pulp, Paper and Paperboard by Image Analysis

TAPPI T 563 – Equivalent Black Area (EBA) and Count of Visible Dirt in Pulp, Paper and Paperboard by Image Analysis

This method uses image analysis to determine the level of dirt in pulp, paper, and paperboard in terms ofEquivalent Black Area (EBA) of dirt specks within the physical area range of 0.02 to 3.0 mm² reported in parts per million as well as the number of dirt specks per square meter of sample. Using the algorithm prescribed in this method, the maximum dirt size is limited to 3.0 mm². Extension to other speck sizes (for example those greater than 3.0 mm² inphysical area), may require changes in equipment, calculation procedures, or both, and is not covered in this test method.This method cannot be used for physical area measurements since it does not correctly measure the dirt specks for that mode of measurement.