Flow imaging characterisation of morphological changes of chemical pulp due to refining

Hyll, Kari; Björk, Elisabeth; Vomhoff, Hannes

doi:10.3183/npprj-2016-31-03-p411-421

Cited by 1 publication

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“…Another explanation can be that a gentle treatment of fibres preserves more of their inherent stiffness. Both these explanations are supported by Hyll et al (2016) who found increased tensile index and bulk by laboratory refining, though of bleached kraft softwood pulp. They found that the generated fines were more fibrillar and that less fibre shortening and kinks were introduced with a finer filling pattern compared to standard ones.…”

Section: Resultsmentioning

confidence: 69%

Low-consistency refining of CTMP targeting high strength and bulk: effect of filling pattern and trial scale

Berg

Hellstadius

Lundfors

et al. 2020

Nordic Pulp &Amp; Paper Research Journal

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Chemithermomechanical pulp (CTMP) is often used in central layers of multiply paperboards due to its high bulk and strength. Such a CTMP should consist of well-separated undamaged fibres with sufficient bonding capacity. The basic objective of this work is to optimize process conditions in low-consistency (LC) refining, i. e. to select or ultimately develop new optimal LC refiner filling patterns, in order to produce fibrillar fines and improve the separation of fibres from each other while preserving the natural fibre morphology as much as possible. Furthermore, the aim is to evaluate if this type of work can be done at laboratory-scale or if it is necessary to run trials in pilot- or mill-scale in order to get relevant answers. First stage CTMP made from Norway spruce (Picea abies) was LC refined in mill-, pilot- and laboratory-scale trials and with different filling patterns. The results show that an LR1 laboratory refiner can favourably be used instead of larger refiners in order to characterize CTMP with regard to tensile index and z-strength versus bulk. A fine filling pattern resulted in CTMP with higher tensile index, z-strength and energy efficiency at maintained bulk compared to a standard filling pattern.

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Section: Resultsmentioning

confidence: 69%