Abstract

The quality of wood powders depends on the size reduction technology used to produce them. The pre-drying, chipping, and conventional (impact and attritional) size reduction steps, commonly employed in industry, act to degrade wood and diminish its full potential as a renewable feedstock. In this study, the effect of using a new green (i.e. freshly harvested) milling technology, the multi-blade shaft mill (MBSM), on wood powder properties was investigated. Particle size distribution (PSD) and shape properties were measured by two-dimensional image analysis and surface area analysis was performed. The results showed that the MBSM can produce much finer powders compared to hammer milling, with particles demonstrating unique morphology and high specific surface area. Green wood milling yielded particles with the highest sphericity (0.64), aspect ratio (0.58), and micropore diameter (4.5 nm). Finer particles with spherical shapes enhanced the bulk density. Moreover, mill settings permit tailor-made powders according to the desired PSD.

Keywords

Powder technology; Pinus sylvestris L; Aspect ratio; Sphericity; Image analysis; Particle morphology

Published in

Powder Technology
2022, Volume: 407, article number: 117664

SLU Authors

• Das, Atanu Kumar

  • Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences
    

• Agar, David

  • Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences
    

• Thyrel, Mikael

  • Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences
    

• Rudolfsson, Magnus

  • Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences
    

Sustainable Development Goals

Ensure access to affordable, reliable, sustainable and modern energy for all
Promote sustained, inclusive and sustainable economic growth, full and productive employment and decent work for all


UKÄ Subject classification

Wood Science


Publication identifier

DOI: https://doi.org/10.1016/j.powtec.2022.117664

Permanent link to this page (URI)

https://res.slu.se/id/publ/118114