Softwood chips made from three different processes (canter head chipper, drum chipper headrig, disc chipper) were assessed for their impact on kraft pulping and pulp quality. While all chip types had acceptable size distributions for kraft pulping purposes, the drum chips had a 12% lower packing density that the other chip types. Differences in fibre lengths between the different chip types were less than 0.2 mm and are considered minor. The disk and drum chips, which had high levels of internal fissuring, pulped in a similar manner and had low reject levels. The conical chips lacked fissuring, were more difficult to pulp and had reject levels that were 3 fold higher than that of the other chip types. The effects of different chip types on kraft pulping justify the investigation of segregating chip flows at the sawmill level as a means of alleviating problems faced when pulping chip mixtures.
Bicho, Paul, Huntley, Shannon. 2004. Assessing the effects of canter chips on kraft pulp quality. Forest Investment Account (FIA) - Forest Science Program. Forest Investment Account Report. FIA2004MR247