Energy consumption in refining of Scots pine and Norway spruce TMP is governed by fibre morphology and ultrastructure

Daniel, GeoffreySwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens produkter,Department of Forest Products (author)

Studies on the different behaviour of Scots pine and Norway spruce during thermomechanical pulping were conducted to find reasons for explaining the greater energy consumption of pine. Well characterized wood samples from clear-cut trees and thinnings were used in pilot scale trials to produce highly characterized pulps. Structural and topochemical differences found between pine and spruce likely to have a strong negative impact on energy included: i) presence of a greater proportion of latewood fibres in pine annual rings with thick secondary cell walls and concomitant reduced fibre collapsibility; ii) ultrastructural differences in the location of fractures at the fibre secondary wall level during primary refining with pine showing greater resistance to refining although it defibrated easier than spruce; iii) that fibre separation and fibre development were sequential processes in pine and not concurrent as in spruce; and iv) the greater amounts of extractives in pine and their redistribution onto the surfaces of fibres and fines during processing

Bardage, StigSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Trävetenskap,Forest economy(Swepub:slu)51596 (author)
Fernando, DineshSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Trävetenskap,Forest economy(Swepub:slu)50319 (author)
Hafrén, JonasSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Trävetenskap,Forest economy(Swepub:slu)47034 (author)
Ander, PaulSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Trävetenskap,Forest economy(Swepub:slu)47165 (author)
Sveriges lantbruksuniversitetInstitutionen för skogens produkter (creator_code:org_t)
Sveriges lantbruksuniversitet

In:SPCI meddelande / The Swedish Association of Pulp and Paper Engineers, s. 82-860280-6800

By the author/editor: Daniel, Geoffrey; Bardage, Stig; Fernando, Dinesh; Hafrén, Jonas; Ander, Paul

About the subject

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

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