The impact of using different wood qualities and wood species on chips produced using a novel type of pilot drum chipper

Originally included in thesis in manuscript form.
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.

Salehi, HamidSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Skogens biomaterial och teknologi,Department of Forest Biomaterials and Technology (author)
Larsson, SylviaSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Skogens biomaterial och teknologi,Department of Forest Biomaterials and Technology(Swepub:slu)50852 (author)
Sjölund, TorbjörnMoRe Research i Örnsköldsvik AB, Box 70, Örnsköldsvik, SE-891 22, Sweden (author)
Jönsson, Leif J.Umeå universitet,Kemiska institutionen(Swepub:umu)leja0012 (author)
Umeå universitetKemiska institutionen (creator_code:org_t)
Sveriges lantbruksuniversitet

In:Nordic Pulp & Paper Research Journal: De Gruyter Open36:2, s. 214-2260283-26312000-0669

By the author/editor: Gard Timmerfors, ...; Salehi, Hamid; Larsson, Sylvia; Sjölund, Torbjör ...; Jönsson, Leif J.

About the subject

AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Agriculture Fore ...; and Wood Science

By the university: Umeå University; Swedish University of Agricultural Sciences

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.