A shive is a small bundle of incompletely cooked wood fibres in the chemical pulp used in papermaking. [1] They are smaller than knots and are more difficult to separate from the pulp. Typically the content of shives in kraft pulp is 0.1 to 1.0%.

When dirt, shives, or other impurities surface in matters exceeding 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.

shives on a pulp dryer has inherent challenges. Light source must be strong enough to penetrate the lap pulp to effectively detect dirt & shives. Absorption, Transmitted, Reflected and Refracted Light all play a role in getting good dirt and shive counts on the pulp dryer or in the QC Lab.

Fractionating a low energy feed pulp containing 57% shives is difficult as this type of pulp dewaters and thickens very quickly resulting in blocked pipes and valves. However, processing the pulp at 0.5% consistency produces an accept pulp containing 5 …

The shives module measures the shives content of the sample. Accurate and rapid information on average shives length, shives width, amount of shives and shives weight are important knowledge in order to optimise the pulp process.

Recent advances in computer and camera technology have enabled the development of a new revolutionary method to measure fiber properties and shive content from pulp. These new meas- urements, together with Canadian Standard Freeness (CSF) measurement, are now included in the kajaaniMAP on-line analyzer.

Shives may be counted as dirt specks i f they are visible when viewed at an angle normal to the general direction of the pulp sheet, or they may be recorded separately if th is information is needed.

The specific energy consumption needed to produce pulp at a certain tensile index was reduced by 320 kWh/BDT (15%) for chips pre-treated with ~1.2% Na 2 SO 3 compared with untreated chips.

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.

Shives are small fiber bundles of fibers that have not been separated into individual fibers during the pulping process. They appear as "splinters" that are darker than the pulp.