How to Detect Dirt and Shives in Pulp Slurries

Abstract ‐ Historically, pulp manufacturers rely on manual laboratory tests to measure dirt and shives in pulps. Lab
testing provides an equivalent black area (EBA) which delivers a parts per million (PPM) value. Most virgin fiber pulp
producers have targets of < 4 PPM. When dirt, shives or other impurities surface in values exceed 4 PPM, it’s an all
hands on‐deck to troubleshoot and remove the contamination source. Unfortunately, the pulp has already been
produced into lap pulp and has to be rejected due to an out of spec limit breach. There are several technologies that
have moved from the lab to the pulp dryer. These will be discussed. Latest technology takes this a step further into the
pulping process, into the pulp slurry itself. 

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