Gard Timmerfors, Jessica, Salehi Kahrizsangi, Hamid ORCID: https://orcid.org/0000-0002-2516-6619, Larsson, Sylvia, Sjölund, Torbjörn and Jönsson, Leif (2021) The impact of using different wood qualities and wood species on chips produced using a novel type of pilot drum chipper. Nordic Pulp & Paper Research Journal, 36 (2). pp. 214-226. ISSN 0283-2631 (Print), 2000-0669 (Online) (doi:10.1515/npprj-2019-0096)

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Abstract

Resource-efficient wood chipping for forest-industrial processes demands large fractions of accept chips and small fractions of small-sized material, such as pin chips and fines. In Kraft pulping, a narrow distribution of wood chip thickness is important for even impregnation and for making high-quality pulp. Using newly developed forest-industrial drum-chipping technology, the investigation covered wood of varying moisture content, frozen versus unfrozen wood, and the use of different wood species. Using conventional techniques for analyzing wood chip dimensions, fast-grown spruce wood with high moisture content gave 4.2 % pin chips and fines, which was less than half of the fractions obtained with spruce wood with lower moisture content. A comparison between frozen and unfrozen pine resulted in slightly thinner and shorter chips for the frozen wood, but in both cases accept yields of up to ∼85 % were achieved. A comparison of different tree species (aspen, birch, pine, and spruce) resulted in larger accept fractions (∼90 %) for the hardwood species, even though the average length of these wood chips was as low as 17 mm. The results provide a first indication of how basic wood log properties affect the yields of accept chips and small-sized material when using modern industrial drum-chipping technology.

Item Type:	Article
Uncontrolled Keywords:	drum chipper; frozen wood; moisture content; tree species; wood chips
Subjects:	T Technology > TJ Mechanical engineering and machinery
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Engineering (ENG)
Last Modified:	28 Apr 2022 10:10
URI:	http://gala.gre.ac.uk/id/eprint/31970

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