Designed tools for controlling the defibration mechanisms in the pressure groundwood process
2015 (English)Conference paper, Poster (Other academic)
The pulp and paper industry is a large global industry producing millions of tons of paper each year. To produce pulp for this paper, only a handful of processes are used. One of these is the mechanical pulping process, called Pressure Ground Wood (PGW). Although commonly used, the tribological details of the mechanisms behind the stochastic fiber separation are not well known.
In order to study these mechanisms, and the influence of geometries at the tool surface, a test equipment allowing testing in a similar, but more controlled, environment is needed. For this purpose, a lab scale rig has been designed, capable of grinding at temperatures and pressures at industrially relevant conditions. The tools used are made of CVD-diamond thin films, structured into different well defined patterns of sharp edges. Samples of Norway spruce have been ground both using these tools and a conventional grinding stone surface. The fibers produces are compared and the possibility of controlling the fiber characteristics using the designed tools is discussed.
Place, publisher, year, edition, pages
Tribology Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:uu:diva-270196OAI: oai:DiVA.org:uu-270196DiVA: diva2:886315
International Tribology Conference, Tokyo 2015, Tokyo, September 16-20, 2015
FunderSwedish Energy Agency