Development of TMP fibers in LC- and HC-refining
2012 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, Vol. 27, no 5, 860-871 p.Article in journal (Refereed) Published
Low consistency (LC) refining and high consistency refining (HC) has been studied in a TMP mill. When strength properties were increased, the development of fiber properties was different in LC- and HC-refining. Fiber curl decreased in LC-refining but increased in HC-refining. LC-refining decreased fiber curl and increased tensile index simultaneously in this study. It is therefore likely that the decreased fiber curl contributes to the increase of tensile index in LC-refining. Furthermore, fiber wall thickness decreased and external fibrillation increased in HC-refining, while these properties were only slightly influenced in the LC-refining. Fibrillation was found to decrease in most cases for LC-refining while fiber wall thickness index increased slightly but consistently, which might indicate a less dense structure of the fiber wall or its surface layers. Double-disc HC-refining with the same energy input as in a conical single-disc refiner resulted in fibers of higher external fibrillation, lower fiber wall thickness and higher fiber curl at a given fiber length. The results indicate that analyzing individual fiber dimensions could be a better tool for understanding how fibers develop in different kinds of refining than analyzing conventional handsheet properties.
Place, publisher, year, edition, pages
2012. Vol. 27, no 5, 860-871 p.
LC-refining, HC-refining, Mechanical pulp, TMP, Disintegration, Fiber dimensions, Fiber curl, Fiber wall thickness, Fiber width, Fibrillation, BIN, Sheet properties
IdentifiersURN: urn:nbn:se:miun:diva-18482ISI: 000313375400004ScopusID: 2-s2.0-84871738586OAI: oai:DiVA.org:miun-18482DiVA: diva2:605637